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_4);
 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, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 637                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 638         }
 639         old_error_counter = r_net->error_count;
 640         r_net->error_count = 0;
 641         r_net->hb_responded = 1;
 642         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 643         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 644         /* Now lets do a RTO with this */
 645         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 646             SCTP_RTT_FROM_NON_DATA);
 647         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 648                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 649                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 650                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 651         }
 652         if (r_net->dest_state & SCTP_ADDR_PF) {
 653                 r_net->dest_state &= ~SCTP_ADDR_PF;
 654                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 655         }
 656         if (old_error_counter > 0) {
 657                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 658                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 659         }
 660         if (r_net == stcb->asoc.primary_destination) {
 661                 if (stcb->asoc.alternate) {
 662                         /* release the alternate, primary is good */
 663                         sctp_free_remote_addr(stcb->asoc.alternate);
 664                         stcb->asoc.alternate = NULL;
 665                 }
 666         }
 667         /* Mobility adaptation */
 668         if (req_prim) {
 669                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 670                     SCTP_MOBILITY_BASE) ||
 671                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 672                     SCTP_MOBILITY_FASTHANDOFF)) &&
 673                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 674                     SCTP_MOBILITY_PRIM_DELETED)) {
 675
 676                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 677                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 678                             SCTP_MOBILITY_FASTHANDOFF)) {
 679                                 sctp_assoc_immediate_retrans(stcb,
 680                                     stcb->asoc.primary_destination);
 681                         }
 682                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 683                             SCTP_MOBILITY_BASE)) {
 684                                 sctp_move_chunks_from_net(stcb,
 685                                     stcb->asoc.deleted_primary);
 686                         }
 687                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 688                             stcb->asoc.deleted_primary);
 689                 }
 690         }
 691 }
 692
 693 static int
 694 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 695 {
 696         /*
 697          * return 0 means we want you to proceed with the abort non-zero
 698          * means no abort processing
 699          */
 700         struct sctpasochead *head;
 701
 702         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 703                 /* generate a new vtag and send init */
 704                 LIST_REMOVE(stcb, sctp_asocs);
 705                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 706                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 707                 /*
 708                  * put it in the bucket in the vtag hash of assoc's for the
 709                  * system
 710                  */
 711                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 712                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 713                 return (1);
 714         }
 715         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 716                 /*
 717                  * treat like a case where the cookie expired i.e.: - dump
 718                  * current cookie. - generate a new vtag. - resend init.
 719                  */
 720                 /* generate a new vtag and send init */
 721                 LIST_REMOVE(stcb, sctp_asocs);
 722                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 723                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 724                 sctp_stop_all_cookie_timers(stcb);
 725                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 726                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 727                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 728                 /*
 729                  * put it in the bucket in the vtag hash of assoc's for the
 730                  * system
 731                  */
 732                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 733                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 734                 return (1);
 735         }
 736         return (0);
 737 }
 738
 739 static int
 740 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 741     struct sctp_nets *net)
 742 {
 743         /*
 744          * return 0 means we want you to proceed with the abort non-zero
 745          * means no abort processing
 746          */
 747         if (stcb->asoc.auth_supported == 0) {
 748                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 749                 return (0);
 750         }
 751         sctp_asconf_send_nat_state_update(stcb, net);
 752         return (1);
 753 }
 754
 755
 756 static void
 757 sctp_handle_abort(struct sctp_abort_chunk *abort,
 758     struct sctp_tcb *stcb, struct sctp_nets *net)
 759 {
 760 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 761         struct socket *so;
 762
 763 #endif
 764         uint16_t len;
 765         uint16_t error;
 766
 767         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 768         if (stcb == NULL)
 769                 return;
 770
 771         len = ntohs(abort->ch.chunk_length);
 772         if (len > sizeof(struct sctp_chunkhdr)) {
 773                 /*
 774                  * Need to check the cause codes for our two magic nat
 775                  * aborts which don't kill the assoc necessarily.
 776                  */
 777                 struct sctp_missing_nat_state *natc;
 778
 779                 natc = (struct sctp_missing_nat_state *)(abort + 1);
 780                 error = ntohs(natc->cause);
 781                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 782                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 783                             abort->ch.chunk_flags);
 784                         if (sctp_handle_nat_colliding_state(stcb)) {
 785                                 return;
 786                         }
 787                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 788                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 789                             abort->ch.chunk_flags);
 790                         if (sctp_handle_nat_missing_state(stcb, net)) {
 791                                 return;
 792                         }
 793                 }
 794         } else {
 795                 error = 0;
 796         }
 797         /* stop any receive timers */
 798         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 799         /* notify user of the abort and clean up... */
 800         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 801         /* free the tcb */
 802         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 803         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 804             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 805                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 806         }
 807 #ifdef SCTP_ASOCLOG_OF_TSNS
 808         sctp_print_out_track_log(stcb);
 809 #endif
 810 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 811         so = SCTP_INP_SO(stcb->sctp_ep);
 812         atomic_add_int(&stcb->asoc.refcnt, 1);
 813         SCTP_TCB_UNLOCK(stcb);
 814         SCTP_SOCKET_LOCK(so, 1);
 815         SCTP_TCB_LOCK(stcb);
 816         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 817 #endif
 818         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 819         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 820             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 821 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 822         SCTP_SOCKET_UNLOCK(so, 1);
 823 #endif
 824         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 825 }
 826
 827 static void
 828 sctp_start_net_timers(struct sctp_tcb *stcb)
 829 {
 830         uint32_t cnt_hb_sent;
 831         struct sctp_nets *net;
 832
 833         cnt_hb_sent = 0;
 834         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 835                 /*
 836                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 837                  * If the dest in unconfirmed send a hb as well if under
 838                  * max_hb_burst have been sent.
 839                  */
 840                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 841                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 842                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 843                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 844                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 845                         cnt_hb_sent++;
 846                 }
 847         }
 848         if (cnt_hb_sent) {
 849                 sctp_chunk_output(stcb->sctp_ep, stcb,
 850                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 851                     SCTP_SO_NOT_LOCKED);
 852         }
 853 }
 854
 855
 856 static void
 857 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 858     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 859 {
 860         struct sctp_association *asoc;
 861         int some_on_streamwheel;
 862
 863 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 864         struct socket *so;
 865
 866 #endif
 867
 868         SCTPDBG(SCTP_DEBUG_INPUT2,
 869             "sctp_handle_shutdown: handling SHUTDOWN\n");
 870         if (stcb == NULL)
 871                 return;
 872         asoc = &stcb->asoc;
 873         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 874             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 875                 return;
 876         }
 877         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 878                 /* Shutdown NOT the expected size */
 879                 return;
 880         } else {
 881                 sctp_update_acked(stcb, cp, abort_flag);
 882                 if (*abort_flag) {
 883                         return;
 884                 }
 885         }
 886         if (asoc->control_pdapi) {
 887                 /*
 888                  * With a normal shutdown we assume the end of last record.
 889                  */
 890                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 891                 asoc->control_pdapi->end_added = 1;
 892                 asoc->control_pdapi->pdapi_aborted = 1;
 893                 asoc->control_pdapi = NULL;
 894                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 895 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 896                 so = SCTP_INP_SO(stcb->sctp_ep);
 897                 atomic_add_int(&stcb->asoc.refcnt, 1);
 898                 SCTP_TCB_UNLOCK(stcb);
 899                 SCTP_SOCKET_LOCK(so, 1);
 900                 SCTP_TCB_LOCK(stcb);
 901                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 902                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 903                         /* assoc was freed while we were unlocked */
 904                         SCTP_SOCKET_UNLOCK(so, 1);
 905                         return;
 906                 }
 907 #endif
 908                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 909 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 910                 SCTP_SOCKET_UNLOCK(so, 1);
 911 #endif
 912         }
 913         /* goto SHUTDOWN_RECEIVED state to block new requests */
 914         if (stcb->sctp_socket) {
 915                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 916                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 917                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 918                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 919                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 920                         /*
 921                          * notify upper layer that peer has initiated a
 922                          * shutdown
 923                          */
 924                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 925
 926                         /* reset time */
 927                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 928                 }
 929         }
 930         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 931                 /*
 932                  * stop the shutdown timer, since we WILL move to
 933                  * SHUTDOWN-ACK-SENT.
 934                  */
 935                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 936         }
 937         /* Now is there unsent data on a stream somewhere? */
 938         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 939
 940         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 941             !TAILQ_EMPTY(&asoc->sent_queue) ||
 942             some_on_streamwheel) {
 943                 /* By returning we will push more data out */
 944                 return;
 945         } else {
 946                 /* no outstanding data to send, so move on... */
 947                 /* send SHUTDOWN-ACK */
 948                 /* move to SHUTDOWN-ACK-SENT state */
 949                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 950                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 951                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 952                 }
 953                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 954                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 955                 sctp_stop_timers_for_shutdown(stcb);
 956                 sctp_send_shutdown_ack(stcb, net);
 957                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 958                     stcb, net);
 959         }
 960 }
 961
 962 static void
 963 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 964     struct sctp_tcb *stcb,
 965     struct sctp_nets *net)
 966 {
 967         struct sctp_association *asoc;
 968
 969 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 970         struct socket *so;
 971
 972         so = SCTP_INP_SO(stcb->sctp_ep);
 973 #endif
 974         SCTPDBG(SCTP_DEBUG_INPUT2,
 975             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 976         if (stcb == NULL)
 977                 return;
 978
 979         asoc = &stcb->asoc;
 980         /* process according to association state */
 981         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 982             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 983                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 984                 sctp_send_shutdown_complete(stcb, net, 1);
 985                 SCTP_TCB_UNLOCK(stcb);
 986                 return;
 987         }
 988         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 989             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 990                 /* unexpected SHUTDOWN-ACK... so ignore... */
 991                 SCTP_TCB_UNLOCK(stcb);
 992                 return;
 993         }
 994         if (asoc->control_pdapi) {
 995                 /*
 996                  * With a normal shutdown we assume the end of last record.
 997                  */
 998                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 999                 asoc->control_pdapi->end_added = 1;
1000                 asoc->control_pdapi->pdapi_aborted = 1;
1001                 asoc->control_pdapi = NULL;
1002                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1003 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1004                 atomic_add_int(&stcb->asoc.refcnt, 1);
1005                 SCTP_TCB_UNLOCK(stcb);
1006                 SCTP_SOCKET_LOCK(so, 1);
1007                 SCTP_TCB_LOCK(stcb);
1008                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1009                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1010                         /* assoc was freed while we were unlocked */
1011                         SCTP_SOCKET_UNLOCK(so, 1);
1012                         return;
1013                 }
1014 #endif
1015                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1016 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1017                 SCTP_SOCKET_UNLOCK(so, 1);
1018 #endif
1019         }
1020 #ifdef INVARIANTS
1021         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1022             !TAILQ_EMPTY(&asoc->sent_queue) ||
1023             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1024                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1025         }
1026 #endif
1027         /* stop the timer */
1028         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1029         /* send SHUTDOWN-COMPLETE */
1030         sctp_send_shutdown_complete(stcb, net, 0);
1031         /* notify upper layer protocol */
1032         if (stcb->sctp_socket) {
1033                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1034                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1035                         stcb->sctp_socket->so_snd.sb_cc = 0;
1036                 }
1037                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1038         }
1039         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1040         /* free the TCB but first save off the ep */
1041 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1042         atomic_add_int(&stcb->asoc.refcnt, 1);
1043         SCTP_TCB_UNLOCK(stcb);
1044         SCTP_SOCKET_LOCK(so, 1);
1045         SCTP_TCB_LOCK(stcb);
1046         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1047 #endif
1048         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1049             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1050 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1051         SCTP_SOCKET_UNLOCK(so, 1);
1052 #endif
1053 }
1054
1055 /*
1056  * Skip past the param header and then we will find the chunk that caused the
1057  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1058  * our peer must be broken.
1059  */
1060 static void
1061 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1062     struct sctp_nets *net)
1063 {
1064         struct sctp_chunkhdr *chk;
1065
1066         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1067         switch (chk->chunk_type) {
1068         case SCTP_ASCONF_ACK:
1069         case SCTP_ASCONF:
1070                 sctp_asconf_cleanup(stcb, net);
1071                 break;
1072         case SCTP_FORWARD_CUM_TSN:
1073                 stcb->asoc.prsctp_supported = 0;
1074                 break;
1075         default:
1076                 SCTPDBG(SCTP_DEBUG_INPUT2,
1077                     "Peer does not support chunk type %d(%x)??\n",
1078                     chk->chunk_type, (uint32_t) chk->chunk_type);
1079                 break;
1080         }
1081 }
1082
1083 /*
1084  * Skip past the param header and then we will find the param that caused the
1085  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1086  * these will turn of specific features.
1087  * XXX: Is this the right thing to do?
1088  */
1089 static void
1090 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1091 {
1092         struct sctp_paramhdr *pbad;
1093
1094         pbad = phdr + 1;
1095         switch (ntohs(pbad->param_type)) {
1096                 /* pr-sctp draft */
1097         case SCTP_PRSCTP_SUPPORTED:
1098                 stcb->asoc.prsctp_supported = 0;
1099                 break;
1100         case SCTP_SUPPORTED_CHUNK_EXT:
1101                 break;
1102                 /* draft-ietf-tsvwg-addip-sctp */
1103         case SCTP_HAS_NAT_SUPPORT:
1104                 stcb->asoc.peer_supports_nat = 0;
1105                 break;
1106         case SCTP_ADD_IP_ADDRESS:
1107         case SCTP_DEL_IP_ADDRESS:
1108         case SCTP_SET_PRIM_ADDR:
1109                 stcb->asoc.asconf_supported = 0;
1110                 break;
1111         case SCTP_SUCCESS_REPORT:
1112         case SCTP_ERROR_CAUSE_IND:
1113                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1114                 SCTPDBG(SCTP_DEBUG_INPUT2,
1115                     "Turning off ASCONF to this strange peer\n");
1116                 stcb->asoc.asconf_supported = 0;
1117                 break;
1118         default:
1119                 SCTPDBG(SCTP_DEBUG_INPUT2,
1120                     "Peer does not support param type %d(%x)??\n",
1121                     pbad->param_type, (uint32_t) pbad->param_type);
1122                 break;
1123         }
1124 }
1125
1126 static int
1127 sctp_handle_error(struct sctp_chunkhdr *ch,
1128     struct sctp_tcb *stcb, struct sctp_nets *net)
1129 {
1130         int chklen;
1131         struct sctp_paramhdr *phdr;
1132         uint16_t error, error_type;
1133         uint16_t error_len;
1134         struct sctp_association *asoc;
1135         int adjust;
1136
1137 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1138         struct socket *so;
1139
1140 #endif
1141
1142         /* parse through all of the errors and process */
1143         asoc = &stcb->asoc;
1144         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1145             sizeof(struct sctp_chunkhdr));
1146         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1147         error = 0;
1148         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1149                 /* Process an Error Cause */
1150                 error_type = ntohs(phdr->param_type);
1151                 error_len = ntohs(phdr->param_length);
1152                 if ((error_len > chklen) || (error_len == 0)) {
1153                         /* invalid param length for this param */
1154                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1155                             chklen, error_len);
1156                         return (0);
1157                 }
1158                 if (error == 0) {
1159                         /* report the first error cause */
1160                         error = error_type;
1161                 }
1162                 switch (error_type) {
1163                 case SCTP_CAUSE_INVALID_STREAM:
1164                 case SCTP_CAUSE_MISSING_PARAM:
1165                 case SCTP_CAUSE_INVALID_PARAM:
1166                 case SCTP_CAUSE_NO_USER_DATA:
1167                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1168                             error_type);
1169                         break;
1170                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1171                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1172                             ch->chunk_flags);
1173                         if (sctp_handle_nat_colliding_state(stcb)) {
1174                                 return (0);
1175                         }
1176                         break;
1177                 case SCTP_CAUSE_NAT_MISSING_STATE:
1178                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1179                             ch->chunk_flags);
1180                         if (sctp_handle_nat_missing_state(stcb, net)) {
1181                                 return (0);
1182                         }
1183                         break;
1184                 case SCTP_CAUSE_STALE_COOKIE:
1185                         /*
1186                          * We only act if we have echoed a cookie and are
1187                          * waiting.
1188                          */
1189                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1190                                 int *p;
1191
1192                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1193                                 /* Save the time doubled */
1194                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1195                                 asoc->stale_cookie_count++;
1196                                 if (asoc->stale_cookie_count >
1197                                     asoc->max_init_times) {
1198                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1199                                         /* now free the asoc */
1200 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1201                                         so = SCTP_INP_SO(stcb->sctp_ep);
1202                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1203                                         SCTP_TCB_UNLOCK(stcb);
1204                                         SCTP_SOCKET_LOCK(so, 1);
1205                                         SCTP_TCB_LOCK(stcb);
1206                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1207 #endif
1208                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1209                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1210 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1211                                         SCTP_SOCKET_UNLOCK(so, 1);
1212 #endif
1213                                         return (-1);
1214                                 }
1215                                 /* blast back to INIT state */
1216                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1217                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1218                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1219                                 sctp_stop_all_cookie_timers(stcb);
1220                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1221                         }
1222                         break;
1223                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1224                         /*
1225                          * Nothing we can do here, we don't do hostname
1226                          * addresses so if the peer does not like my IPv6
1227                          * (or IPv4 for that matter) it does not matter. If
1228                          * they don't support that type of address, they can
1229                          * NOT possibly get that packet type... i.e. with no
1230                          * IPv6 you can't recieve a IPv6 packet. so we can
1231                          * safely ignore this one. If we ever added support
1232                          * for HOSTNAME Addresses, then we would need to do
1233                          * something here.
1234                          */
1235                         break;
1236                 case SCTP_CAUSE_UNRECOG_CHUNK:
1237                         sctp_process_unrecog_chunk(stcb, phdr, net);
1238                         break;
1239                 case SCTP_CAUSE_UNRECOG_PARAM:
1240                         sctp_process_unrecog_param(stcb, phdr);
1241                         break;
1242                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1243                         /*
1244                          * We ignore this since the timer will drive out a
1245                          * new cookie anyway and there timer will drive us
1246                          * to send a SHUTDOWN_COMPLETE. We can't send one
1247                          * here since we don't have their tag.
1248                          */
1249                         break;
1250                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1251                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1252                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1253                         /*
1254                          * We should NOT get these here, but in a
1255                          * ASCONF-ACK.
1256                          */
1257                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1258                             error_type);
1259                         break;
1260                 case SCTP_CAUSE_OUT_OF_RESC:
1261                         /*
1262                          * And what, pray tell do we do with the fact that
1263                          * the peer is out of resources? Not really sure we
1264                          * could do anything but abort. I suspect this
1265                          * should have came WITH an abort instead of in a
1266                          * OP-ERROR.
1267                          */
1268                         break;
1269                 default:
1270                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1271                             error_type);
1272                         break;
1273                 }
1274                 adjust = SCTP_SIZE32(error_len);
1275                 chklen -= adjust;
1276                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1277         }
1278         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1279         return (0);
1280 }
1281
1282 static int
1283 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1284     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1285     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1286     struct sctp_nets *net, int *abort_no_unlock,
1287     uint8_t mflowtype, uint32_t mflowid,
1288     uint32_t vrf_id)
1289 {
1290         struct sctp_init_ack *init_ack;
1291         struct mbuf *op_err;
1292
1293         SCTPDBG(SCTP_DEBUG_INPUT2,
1294             "sctp_handle_init_ack: handling INIT-ACK\n");
1295
1296         if (stcb == NULL) {
1297                 SCTPDBG(SCTP_DEBUG_INPUT2,
1298                     "sctp_handle_init_ack: TCB is null\n");
1299                 return (-1);
1300         }
1301         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1302                 /* Invalid length */
1303                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1304                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1305                     src, dst, sh, op_err,
1306                     mflowtype, mflowid,
1307                     vrf_id, net->port);
1308                 *abort_no_unlock = 1;
1309                 return (-1);
1310         }
1311         init_ack = &cp->init;
1312         /* validate parameters */
1313         if (init_ack->initiate_tag == 0) {
1314                 /* protocol error... send an abort */
1315                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1316                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1317                     src, dst, sh, op_err,
1318                     mflowtype, mflowid,
1319                     vrf_id, net->port);
1320                 *abort_no_unlock = 1;
1321                 return (-1);
1322         }
1323         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1324                 /* protocol error... send an abort */
1325                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1326                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1327                     src, dst, sh, op_err,
1328                     mflowtype, mflowid,
1329                     vrf_id, net->port);
1330                 *abort_no_unlock = 1;
1331                 return (-1);
1332         }
1333         if (init_ack->num_inbound_streams == 0) {
1334                 /* protocol error... send an abort */
1335                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1336                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1337                     src, dst, sh, op_err,
1338                     mflowtype, mflowid,
1339                     vrf_id, net->port);
1340                 *abort_no_unlock = 1;
1341                 return (-1);
1342         }
1343         if (init_ack->num_outbound_streams == 0) {
1344                 /* protocol error... send an abort */
1345                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1346                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1347                     src, dst, sh, op_err,
1348                     mflowtype, mflowid,
1349                     vrf_id, net->port);
1350                 *abort_no_unlock = 1;
1351                 return (-1);
1352         }
1353         /* process according to association state... */
1354         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1355         case SCTP_STATE_COOKIE_WAIT:
1356                 /* this is the expected state for this chunk */
1357                 /* process the INIT-ACK parameters */
1358                 if (stcb->asoc.primary_destination->dest_state &
1359                     SCTP_ADDR_UNCONFIRMED) {
1360                         /*
1361                          * The primary is where we sent the INIT, we can
1362                          * always consider it confirmed when the INIT-ACK is
1363                          * returned. Do this before we load addresses
1364                          * though.
1365                          */
1366                         stcb->asoc.primary_destination->dest_state &=
1367                             ~SCTP_ADDR_UNCONFIRMED;
1368                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1369                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1370                 }
1371                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1372                     net, abort_no_unlock,
1373                     mflowtype, mflowid,
1374                     vrf_id) < 0) {
1375                         /* error in parsing parameters */
1376                         return (-1);
1377                 }
1378                 /* update our state */
1379                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1380                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1381
1382                 /* reset the RTO calc */
1383                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1384                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1385                             stcb->asoc.overall_error_count,
1386                             0,
1387                             SCTP_FROM_SCTP_INPUT,
1388                             __LINE__);
1389                 }
1390                 stcb->asoc.overall_error_count = 0;
1391                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1392                 /*
1393                  * collapse the init timer back in case of a exponential
1394                  * backoff
1395                  */
1396                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1397                     stcb, net);
1398                 /*
1399                  * the send at the end of the inbound data processing will
1400                  * cause the cookie to be sent
1401                  */
1402                 break;
1403         case SCTP_STATE_SHUTDOWN_SENT:
1404                 /* incorrect state... discard */
1405                 break;
1406         case SCTP_STATE_COOKIE_ECHOED:
1407                 /* incorrect state... discard */
1408                 break;
1409         case SCTP_STATE_OPEN:
1410                 /* incorrect state... discard */
1411                 break;
1412         case SCTP_STATE_EMPTY:
1413         case SCTP_STATE_INUSE:
1414         default:
1415                 /* incorrect state... discard */
1416                 return (-1);
1417                 break;
1418         }
1419         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1420         return (0);
1421 }
1422
1423 static struct sctp_tcb *
1424 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1425     struct sockaddr *src, struct sockaddr *dst,
1426     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1427     struct sctp_inpcb *inp, struct sctp_nets **netp,
1428     struct sockaddr *init_src, int *notification,
1429     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1430     uint8_t mflowtype, uint32_t mflowid,
1431     uint32_t vrf_id, uint16_t port);
1432
1433
1434 /*
1435  * handle a state cookie for an existing association m: input packet mbuf
1436  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1437  * "split" mbuf and the cookie signature does not exist offset: offset into
1438  * mbuf to the cookie-echo chunk
1439  */
1440 static struct sctp_tcb *
1441 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1442     struct sockaddr *src, struct sockaddr *dst,
1443     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1444     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1445     struct sockaddr *init_src, int *notification,
1446     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1447     uint8_t mflowtype, uint32_t mflowid,
1448     uint32_t vrf_id, uint16_t port)
1449 {
1450         struct sctp_association *asoc;
1451         struct sctp_init_chunk *init_cp, init_buf;
1452         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1453         struct sctp_nets *net;
1454         struct mbuf *op_err;
1455         int init_offset, initack_offset, i;
1456         int retval;
1457         int spec_flag = 0;
1458         uint32_t how_indx;
1459
1460 #if defined(SCTP_DETAILED_STR_STATS)
1461         int j;
1462
1463 #endif
1464
1465         net = *netp;
1466         /* I know that the TCB is non-NULL from the caller */
1467         asoc = &stcb->asoc;
1468         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1469                 if (asoc->cookie_how[how_indx] == 0)
1470                         break;
1471         }
1472         if (how_indx < sizeof(asoc->cookie_how)) {
1473                 asoc->cookie_how[how_indx] = 1;
1474         }
1475         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1476                 /* SHUTDOWN came in after sending INIT-ACK */
1477                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1478                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1479                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1480                     mflowtype, mflowid,
1481                     vrf_id, net->port);
1482                 if (how_indx < sizeof(asoc->cookie_how))
1483                         asoc->cookie_how[how_indx] = 2;
1484                 return (NULL);
1485         }
1486         /*
1487          * find and validate the INIT chunk in the cookie (peer's info) the
1488          * INIT should start after the cookie-echo header struct (chunk
1489          * header, state cookie header struct)
1490          */
1491         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1492
1493         init_cp = (struct sctp_init_chunk *)
1494             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1495             (uint8_t *) & init_buf);
1496         if (init_cp == NULL) {
1497                 /* could not pull a INIT chunk in cookie */
1498                 return (NULL);
1499         }
1500         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1501                 return (NULL);
1502         }
1503         /*
1504          * find and validate the INIT-ACK chunk in the cookie (my info) the
1505          * INIT-ACK follows the INIT chunk
1506          */
1507         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1508         initack_cp = (struct sctp_init_ack_chunk *)
1509             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1510             (uint8_t *) & initack_buf);
1511         if (initack_cp == NULL) {
1512                 /* could not pull INIT-ACK chunk in cookie */
1513                 return (NULL);
1514         }
1515         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1516                 return (NULL);
1517         }
1518         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1519             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1520                 /*
1521                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1522                  * to get into the OPEN state
1523                  */
1524                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1525                         /*-
1526                          * Opps, this means that we somehow generated two vtag's
1527                          * the same. I.e. we did:
1528                          *  Us               Peer
1529                          *   <---INIT(tag=a)------
1530                          *   ----INIT-ACK(tag=t)-->
1531                          *   ----INIT(tag=t)------> *1
1532                          *   <---INIT-ACK(tag=a)---
1533                          *   <----CE(tag=t)------------- *2
1534                          *
1535                          * At point *1 we should be generating a different
1536                          * tag t'. Which means we would throw away the CE and send
1537                          * ours instead. Basically this is case C (throw away side).
1538                          */
1539                         if (how_indx < sizeof(asoc->cookie_how))
1540                                 asoc->cookie_how[how_indx] = 17;
1541                         return (NULL);
1542
1543                 }
1544                 switch (SCTP_GET_STATE(asoc)) {
1545                 case SCTP_STATE_COOKIE_WAIT:
1546                 case SCTP_STATE_COOKIE_ECHOED:
1547                         /*
1548                          * INIT was sent but got a COOKIE_ECHO with the
1549                          * correct tags... just accept it...but we must
1550                          * process the init so that we can make sure we have
1551                          * the right seq no's.
1552                          */
1553                         /* First we must process the INIT !! */
1554                         retval = sctp_process_init(init_cp, stcb);
1555                         if (retval < 0) {
1556                                 if (how_indx < sizeof(asoc->cookie_how))
1557                                         asoc->cookie_how[how_indx] = 3;
1558                                 return (NULL);
1559                         }
1560                         /* we have already processed the INIT so no problem */
1561                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1562                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1563                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1564                         /* update current state */
1565                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1566                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1567                         else
1568                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1569
1570                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1571                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1572                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1573                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1574                         }
1575                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1576                         sctp_stop_all_cookie_timers(stcb);
1577                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1578                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1579                             (inp->sctp_socket->so_qlimit == 0)
1580                             ) {
1581 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1582                                 struct socket *so;
1583
1584 #endif
1585                                 /*
1586                                  * Here is where collision would go if we
1587                                  * did a connect() and instead got a
1588                                  * init/init-ack/cookie done before the
1589                                  * init-ack came back..
1590                                  */
1591                                 stcb->sctp_ep->sctp_flags |=
1592                                     SCTP_PCB_FLAGS_CONNECTED;
1593 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1594                                 so = SCTP_INP_SO(stcb->sctp_ep);
1595                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1596                                 SCTP_TCB_UNLOCK(stcb);
1597                                 SCTP_SOCKET_LOCK(so, 1);
1598                                 SCTP_TCB_LOCK(stcb);
1599                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1600                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1601                                         SCTP_SOCKET_UNLOCK(so, 1);
1602                                         return (NULL);
1603                                 }
1604 #endif
1605                                 soisconnected(stcb->sctp_socket);
1606 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1607                                 SCTP_SOCKET_UNLOCK(so, 1);
1608 #endif
1609                         }
1610                         /* notify upper layer */
1611                         *notification = SCTP_NOTIFY_ASSOC_UP;
1612                         /*
1613                          * since we did not send a HB make sure we don't
1614                          * double things
1615                          */
1616                         net->hb_responded = 1;
1617                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1618                             &cookie->time_entered,
1619                             sctp_align_unsafe_makecopy,
1620                             SCTP_RTT_FROM_NON_DATA);
1621
1622                         if (stcb->asoc.sctp_autoclose_ticks &&
1623                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1624                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1625                                     inp, stcb, NULL);
1626                         }
1627                         break;
1628                 default:
1629                         /*
1630                          * we're in the OPEN state (or beyond), so peer must
1631                          * have simply lost the COOKIE-ACK
1632                          */
1633                         break;
1634                 }               /* end switch */
1635                 sctp_stop_all_cookie_timers(stcb);
1636                 /*
1637                  * We ignore the return code here.. not sure if we should
1638                  * somehow abort.. but we do have an existing asoc. This
1639                  * really should not fail.
1640                  */
1641                 if (sctp_load_addresses_from_init(stcb, m,
1642                     init_offset + sizeof(struct sctp_init_chunk),
1643                     initack_offset, src, dst, init_src)) {
1644                         if (how_indx < sizeof(asoc->cookie_how))
1645                                 asoc->cookie_how[how_indx] = 4;
1646                         return (NULL);
1647                 }
1648                 /* respond with a COOKIE-ACK */
1649                 sctp_toss_old_cookies(stcb, asoc);
1650                 sctp_send_cookie_ack(stcb);
1651                 if (how_indx < sizeof(asoc->cookie_how))
1652                         asoc->cookie_how[how_indx] = 5;
1653                 return (stcb);
1654         }
1655         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1656             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1657             cookie->tie_tag_my_vtag == 0 &&
1658             cookie->tie_tag_peer_vtag == 0) {
1659                 /*
1660                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1661                  */
1662                 if (how_indx < sizeof(asoc->cookie_how))
1663                         asoc->cookie_how[how_indx] = 6;
1664                 return (NULL);
1665         }
1666         /*
1667          * If nat support, and the below and stcb is established, send back
1668          * a ABORT(colliding state) if we are established.
1669          */
1670         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1671             (asoc->peer_supports_nat) &&
1672             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1673             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1674             (asoc->peer_vtag == 0)))) {
1675                 /*
1676                  * Special case - Peer's support nat. We may have two init's
1677                  * that we gave out the same tag on since one was not
1678                  * established.. i.e. we get INIT from host-1 behind the nat
1679                  * and we respond tag-a, we get a INIT from host-2 behind
1680                  * the nat and we get tag-a again. Then we bring up host-1
1681                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1682                  * Now we have colliding state. We must send an abort here
1683                  * with colliding state indication.
1684                  */
1685                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1686                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1687                     mflowtype, mflowid,
1688                     vrf_id, port);
1689                 return (NULL);
1690         }
1691         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1692             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1693             (asoc->peer_vtag == 0))) {
1694                 /*
1695                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1696                  * should be ok, re-accept peer info
1697                  */
1698                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1699                         /*
1700                          * Extension of case C. If we hit this, then the
1701                          * random number generator returned the same vtag
1702                          * when we first sent our INIT-ACK and when we later
1703                          * sent our INIT. The side with the seq numbers that
1704                          * are different will be the one that normnally
1705                          * would have hit case C. This in effect "extends"
1706                          * our vtags in this collision case to be 64 bits.
1707                          * The same collision could occur aka you get both
1708                          * vtag and seq number the same twice in a row.. but
1709                          * is much less likely. If it did happen then we
1710                          * would proceed through and bring up the assoc.. we
1711                          * may end up with the wrong stream setup however..
1712                          * which would be bad.. but there is no way to
1713                          * tell.. until we send on a stream that does not
1714                          * exist :-)
1715                          */
1716                         if (how_indx < sizeof(asoc->cookie_how))
1717                                 asoc->cookie_how[how_indx] = 7;
1718
1719                         return (NULL);
1720                 }
1721                 if (how_indx < sizeof(asoc->cookie_how))
1722                         asoc->cookie_how[how_indx] = 8;
1723                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1724                 sctp_stop_all_cookie_timers(stcb);
1725                 /*
1726                  * since we did not send a HB make sure we don't double
1727                  * things
1728                  */
1729                 net->hb_responded = 1;
1730                 if (stcb->asoc.sctp_autoclose_ticks &&
1731                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1732                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1733                             NULL);
1734                 }
1735                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1736                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1737
1738                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1739                         /*
1740                          * Ok the peer probably discarded our data (if we
1741                          * echoed a cookie+data). So anything on the
1742                          * sent_queue should be marked for retransmit, we
1743                          * may not get something to kick us so it COULD
1744                          * still take a timeout to move these.. but it can't
1745                          * hurt to mark them.
1746                          */
1747                         struct sctp_tmit_chunk *chk;
1748
1749                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1750                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1751                                         chk->sent = SCTP_DATAGRAM_RESEND;
1752                                         sctp_flight_size_decrease(chk);
1753                                         sctp_total_flight_decrease(stcb, chk);
1754                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1755                                         spec_flag++;
1756                                 }
1757                         }
1758
1759                 }
1760                 /* process the INIT info (peer's info) */
1761                 retval = sctp_process_init(init_cp, stcb);
1762                 if (retval < 0) {
1763                         if (how_indx < sizeof(asoc->cookie_how))
1764                                 asoc->cookie_how[how_indx] = 9;
1765                         return (NULL);
1766                 }
1767                 if (sctp_load_addresses_from_init(stcb, m,
1768                     init_offset + sizeof(struct sctp_init_chunk),
1769                     initack_offset, src, dst, init_src)) {
1770                         if (how_indx < sizeof(asoc->cookie_how))
1771                                 asoc->cookie_how[how_indx] = 10;
1772                         return (NULL);
1773                 }
1774                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1775                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1776                         *notification = SCTP_NOTIFY_ASSOC_UP;
1777
1778                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1779                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1780                             (inp->sctp_socket->so_qlimit == 0)) {
1781 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1782                                 struct socket *so;
1783
1784 #endif
1785                                 stcb->sctp_ep->sctp_flags |=
1786                                     SCTP_PCB_FLAGS_CONNECTED;
1787 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1788                                 so = SCTP_INP_SO(stcb->sctp_ep);
1789                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1790                                 SCTP_TCB_UNLOCK(stcb);
1791                                 SCTP_SOCKET_LOCK(so, 1);
1792                                 SCTP_TCB_LOCK(stcb);
1793                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1794                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1795                                         SCTP_SOCKET_UNLOCK(so, 1);
1796                                         return (NULL);
1797                                 }
1798 #endif
1799                                 soisconnected(stcb->sctp_socket);
1800 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1801                                 SCTP_SOCKET_UNLOCK(so, 1);
1802 #endif
1803                         }
1804                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1805                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1806                         else
1807                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1808                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1809                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1810                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1811                 } else {
1812                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1813                 }
1814                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1815                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1816                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1817                             stcb->sctp_ep, stcb, asoc->primary_destination);
1818                 }
1819                 sctp_stop_all_cookie_timers(stcb);
1820                 sctp_toss_old_cookies(stcb, asoc);
1821                 sctp_send_cookie_ack(stcb);
1822                 if (spec_flag) {
1823                         /*
1824                          * only if we have retrans set do we do this. What
1825                          * this call does is get only the COOKIE-ACK out and
1826                          * then when we return the normal call to
1827                          * sctp_chunk_output will get the retrans out behind
1828                          * this.
1829                          */
1830                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1831                 }
1832                 if (how_indx < sizeof(asoc->cookie_how))
1833                         asoc->cookie_how[how_indx] = 11;
1834
1835                 return (stcb);
1836         }
1837         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1838             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1839             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1840             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1841             cookie->tie_tag_peer_vtag != 0) {
1842                 struct sctpasochead *head;
1843
1844 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1845                 struct socket *so;
1846
1847 #endif
1848
1849                 if (asoc->peer_supports_nat) {
1850                         /*
1851                          * This is a gross gross hack. Just call the
1852                          * cookie_new code since we are allowing a duplicate
1853                          * association. I hope this works...
1854                          */
1855                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1856                             sh, cookie, cookie_len,
1857                             inp, netp, init_src, notification,
1858                             auth_skipped, auth_offset, auth_len,
1859                             mflowtype, mflowid,
1860                             vrf_id, port));
1861                 }
1862                 /*
1863                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1864                  */
1865                 /* temp code */
1866                 if (how_indx < sizeof(asoc->cookie_how))
1867                         asoc->cookie_how[how_indx] = 12;
1868                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1869                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1870
1871                 /* notify upper layer */
1872                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1873                 atomic_add_int(&stcb->asoc.refcnt, 1);
1874                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1875                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1876                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1877                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1878                 }
1879                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1880                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1881                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1882                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1883                 }
1884                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1885                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1886                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1887                             stcb->sctp_ep, stcb, asoc->primary_destination);
1888
1889                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1890                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1891                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1892                 }
1893                 asoc->pre_open_streams =
1894                     ntohs(initack_cp->init.num_outbound_streams);
1895                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1896                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1897                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1898
1899                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1900
1901                 asoc->str_reset_seq_in = asoc->init_seq_number;
1902
1903                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1904                 if (asoc->mapping_array) {
1905                         memset(asoc->mapping_array, 0,
1906                             asoc->mapping_array_size);
1907                 }
1908                 if (asoc->nr_mapping_array) {
1909                         memset(asoc->nr_mapping_array, 0,
1910                             asoc->mapping_array_size);
1911                 }
1912                 SCTP_TCB_UNLOCK(stcb);
1913 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1914                 so = SCTP_INP_SO(stcb->sctp_ep);
1915                 SCTP_SOCKET_LOCK(so, 1);
1916 #endif
1917                 SCTP_INP_INFO_WLOCK();
1918                 SCTP_INP_WLOCK(stcb->sctp_ep);
1919                 SCTP_TCB_LOCK(stcb);
1920                 atomic_add_int(&stcb->asoc.refcnt, -1);
1921                 /* send up all the data */
1922                 SCTP_TCB_SEND_LOCK(stcb);
1923
1924                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1925                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1926                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1927 #if defined(SCTP_DETAILED_STR_STATS)
1928                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1929                                 asoc->strmout[i].abandoned_sent[j] = 0;
1930                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1931                         }
1932 #else
1933                         asoc->strmout[i].abandoned_sent[0] = 0;
1934                         asoc->strmout[i].abandoned_unsent[0] = 0;
1935 #endif
1936                         stcb->asoc.strmout[i].stream_no = i;
1937                         stcb->asoc.strmout[i].next_sequence_send = 0;
1938                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1939                 }
1940                 /* process the INIT-ACK info (my info) */
1941                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1942                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1943
1944                 /* pull from vtag hash */
1945                 LIST_REMOVE(stcb, sctp_asocs);
1946                 /* re-insert to new vtag position */
1947                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1948                     SCTP_BASE_INFO(hashasocmark))];
1949                 /*
1950                  * put it in the bucket in the vtag hash of assoc's for the
1951                  * system
1952                  */
1953                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1954
1955                 SCTP_TCB_SEND_UNLOCK(stcb);
1956                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1957                 SCTP_INP_INFO_WUNLOCK();
1958 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1959                 SCTP_SOCKET_UNLOCK(so, 1);
1960 #endif
1961                 asoc->total_flight = 0;
1962                 asoc->total_flight_count = 0;
1963                 /* process the INIT info (peer's info) */
1964                 retval = sctp_process_init(init_cp, stcb);
1965                 if (retval < 0) {
1966                         if (how_indx < sizeof(asoc->cookie_how))
1967                                 asoc->cookie_how[how_indx] = 13;
1968
1969                         return (NULL);
1970                 }
1971                 /*
1972                  * since we did not send a HB make sure we don't double
1973                  * things
1974                  */
1975                 net->hb_responded = 1;
1976
1977                 if (sctp_load_addresses_from_init(stcb, m,
1978                     init_offset + sizeof(struct sctp_init_chunk),
1979                     initack_offset, src, dst, init_src)) {
1980                         if (how_indx < sizeof(asoc->cookie_how))
1981                                 asoc->cookie_how[how_indx] = 14;
1982
1983                         return (NULL);
1984                 }
1985                 /* respond with a COOKIE-ACK */
1986                 sctp_stop_all_cookie_timers(stcb);
1987                 sctp_toss_old_cookies(stcb, asoc);
1988                 sctp_send_cookie_ack(stcb);
1989                 if (how_indx < sizeof(asoc->cookie_how))
1990                         asoc->cookie_how[how_indx] = 15;
1991
1992                 return (stcb);
1993         }
1994         if (how_indx < sizeof(asoc->cookie_how))
1995                 asoc->cookie_how[how_indx] = 16;
1996         /* all other cases... */
1997         return (NULL);
1998 }
1999
2000
2001 /*
2002  * handle a state cookie for a new association m: input packet mbuf chain--
2003  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2004  * and the cookie signature does not exist offset: offset into mbuf to the
2005  * cookie-echo chunk length: length of the cookie chunk to: where the init
2006  * was from returns a new TCB
2007  */
2008 static struct sctp_tcb *
2009 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2010     struct sockaddr *src, struct sockaddr *dst,
2011     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2012     struct sctp_inpcb *inp, struct sctp_nets **netp,
2013     struct sockaddr *init_src, int *notification,
2014     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2015     uint8_t mflowtype, uint32_t mflowid,
2016     uint32_t vrf_id, uint16_t port)
2017 {
2018         struct sctp_tcb *stcb;
2019         struct sctp_init_chunk *init_cp, init_buf;
2020         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2021         union sctp_sockstore store;
2022         struct sctp_association *asoc;
2023         int init_offset, initack_offset, initack_limit;
2024         int retval;
2025         int error = 0;
2026         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2027
2028 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2029         struct socket *so;
2030
2031         so = SCTP_INP_SO(inp);
2032 #endif
2033
2034         /*
2035          * find and validate the INIT chunk in the cookie (peer's info) the
2036          * INIT should start after the cookie-echo header struct (chunk
2037          * header, state cookie header struct)
2038          */
2039         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2040         init_cp = (struct sctp_init_chunk *)
2041             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2042             (uint8_t *) & init_buf);
2043         if (init_cp == NULL) {
2044                 /* could not pull a INIT chunk in cookie */
2045                 SCTPDBG(SCTP_DEBUG_INPUT1,
2046                     "process_cookie_new: could not pull INIT chunk hdr\n");
2047                 return (NULL);
2048         }
2049         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2050                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2051                 return (NULL);
2052         }
2053         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2054         /*
2055          * find and validate the INIT-ACK chunk in the cookie (my info) the
2056          * INIT-ACK follows the INIT chunk
2057          */
2058         initack_cp = (struct sctp_init_ack_chunk *)
2059             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2060             (uint8_t *) & initack_buf);
2061         if (initack_cp == NULL) {
2062                 /* could not pull INIT-ACK chunk in cookie */
2063                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2064                 return (NULL);
2065         }
2066         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2067                 return (NULL);
2068         }
2069         /*
2070          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2071          * "initack_limit" value.  This is because the chk_length field
2072          * includes the length of the cookie, but the cookie is omitted when
2073          * the INIT and INIT_ACK are tacked onto the cookie...
2074          */
2075         initack_limit = offset + cookie_len;
2076
2077         /*
2078          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2079          * and popluate
2080          */
2081
2082         /*
2083          * Here we do a trick, we set in NULL for the proc/thread argument.
2084          * We do this since in effect we only use the p argument when the
2085          * socket is unbound and we must do an implicit bind. Since we are
2086          * getting a cookie, we cannot be unbound.
2087          */
2088         stcb = sctp_aloc_assoc(inp, init_src, &error,
2089             ntohl(initack_cp->init.initiate_tag), vrf_id,
2090             (struct thread *)NULL
2091             );
2092         if (stcb == NULL) {
2093                 struct mbuf *op_err;
2094
2095                 /* memory problem? */
2096                 SCTPDBG(SCTP_DEBUG_INPUT1,
2097                     "process_cookie_new: no room for another TCB!\n");
2098                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2099                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2100                     src, dst, sh, op_err,
2101                     mflowtype, mflowid,
2102                     vrf_id, port);
2103                 return (NULL);
2104         }
2105         /* get the correct sctp_nets */
2106         if (netp)
2107                 *netp = sctp_findnet(stcb, init_src);
2108
2109         asoc = &stcb->asoc;
2110         /* get scope variables out of cookie */
2111         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2112         asoc->scope.site_scope = cookie->site_scope;
2113         asoc->scope.local_scope = cookie->local_scope;
2114         asoc->scope.loopback_scope = cookie->loopback_scope;
2115
2116         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2117             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2118                 struct mbuf *op_err;
2119
2120                 /*
2121                  * Houston we have a problem. The EP changed while the
2122                  * cookie was in flight. Only recourse is to abort the
2123                  * association.
2124                  */
2125                 atomic_add_int(&stcb->asoc.refcnt, 1);
2126                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2127                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2128                     src, dst, sh, op_err,
2129                     mflowtype, mflowid,
2130                     vrf_id, port);
2131 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2132                 SCTP_TCB_UNLOCK(stcb);
2133                 SCTP_SOCKET_LOCK(so, 1);
2134                 SCTP_TCB_LOCK(stcb);
2135 #endif
2136                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2137                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2138 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2139                 SCTP_SOCKET_UNLOCK(so, 1);
2140 #endif
2141                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2142                 return (NULL);
2143         }
2144         /* process the INIT-ACK info (my info) */
2145         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2146         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2147         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2148         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2149         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2150         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2151         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2152         asoc->str_reset_seq_in = asoc->init_seq_number;
2153
2154         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2155
2156         /* process the INIT info (peer's info) */
2157         if (netp)
2158                 retval = sctp_process_init(init_cp, stcb);
2159         else
2160                 retval = 0;
2161         if (retval < 0) {
2162                 atomic_add_int(&stcb->asoc.refcnt, 1);
2163 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2164                 SCTP_TCB_UNLOCK(stcb);
2165                 SCTP_SOCKET_LOCK(so, 1);
2166                 SCTP_TCB_LOCK(stcb);
2167 #endif
2168                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2169 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2170                 SCTP_SOCKET_UNLOCK(so, 1);
2171 #endif
2172                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2173                 return (NULL);
2174         }
2175         /* load all addresses */
2176         if (sctp_load_addresses_from_init(stcb, m,
2177             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2178             src, dst, init_src)) {
2179                 atomic_add_int(&stcb->asoc.refcnt, 1);
2180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2181                 SCTP_TCB_UNLOCK(stcb);
2182                 SCTP_SOCKET_LOCK(so, 1);
2183                 SCTP_TCB_LOCK(stcb);
2184 #endif
2185                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2186 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2187                 SCTP_SOCKET_UNLOCK(so, 1);
2188 #endif
2189                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2190                 return (NULL);
2191         }
2192         /*
2193          * verify any preceding AUTH chunk that was skipped
2194          */
2195         /* pull the local authentication parameters from the cookie/init-ack */
2196         sctp_auth_get_cookie_params(stcb, m,
2197             initack_offset + sizeof(struct sctp_init_ack_chunk),
2198             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2199         if (auth_skipped) {
2200                 struct sctp_auth_chunk *auth;
2201
2202                 auth = (struct sctp_auth_chunk *)
2203                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2204                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2205                         /* auth HMAC failed, dump the assoc and packet */
2206                         SCTPDBG(SCTP_DEBUG_AUTH1,
2207                             "COOKIE-ECHO: AUTH failed\n");
2208                         atomic_add_int(&stcb->asoc.refcnt, 1);
2209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2210                         SCTP_TCB_UNLOCK(stcb);
2211                         SCTP_SOCKET_LOCK(so, 1);
2212                         SCTP_TCB_LOCK(stcb);
2213 #endif
2214                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2215 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2216                         SCTP_SOCKET_UNLOCK(so, 1);
2217 #endif
2218                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2219                         return (NULL);
2220                 } else {
2221                         /* remaining chunks checked... good to go */
2222                         stcb->asoc.authenticated = 1;
2223                 }
2224         }
2225         /* update current state */
2226         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2227         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2228         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2229                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2230                     stcb->sctp_ep, stcb, asoc->primary_destination);
2231         }
2232         sctp_stop_all_cookie_timers(stcb);
2233         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2234         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2235
2236         /*
2237          * if we're doing ASCONFs, check to see if we have any new local
2238          * addresses that need to get added to the peer (eg. addresses
2239          * changed while cookie echo in flight).  This needs to be done
2240          * after we go to the OPEN state to do the correct asconf
2241          * processing. else, make sure we have the correct addresses in our
2242          * lists
2243          */
2244
2245         /* warning, we re-use sin, sin6, sa_store here! */
2246         /* pull in local_address (our "from" address) */
2247         switch (cookie->laddr_type) {
2248 #ifdef INET
2249         case SCTP_IPV4_ADDRESS:
2250                 /* source addr is IPv4 */
2251                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2252                 store.sin.sin_family = AF_INET;
2253                 store.sin.sin_len = sizeof(struct sockaddr_in);
2254                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2255                 break;
2256 #endif
2257 #ifdef INET6
2258         case SCTP_IPV6_ADDRESS:
2259                 /* source addr is IPv6 */
2260                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2261                 store.sin6.sin6_family = AF_INET6;
2262                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2263                 store.sin6.sin6_scope_id = cookie->scope_id;
2264                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2265                 break;
2266 #endif
2267         default:
2268                 atomic_add_int(&stcb->asoc.refcnt, 1);
2269 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2270                 SCTP_TCB_UNLOCK(stcb);
2271                 SCTP_SOCKET_LOCK(so, 1);
2272                 SCTP_TCB_LOCK(stcb);
2273 #endif
2274                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2275 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2276                 SCTP_SOCKET_UNLOCK(so, 1);
2277 #endif
2278                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2279                 return (NULL);
2280         }
2281
2282         /* set up to notify upper layer */
2283         *notification = SCTP_NOTIFY_ASSOC_UP;
2284         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2285             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2286             (inp->sctp_socket->so_qlimit == 0)) {
2287                 /*
2288                  * This is an endpoint that called connect() how it got a
2289                  * cookie that is NEW is a bit of a mystery. It must be that
2290                  * the INIT was sent, but before it got there.. a complete
2291                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2292                  * should have went to the other code.. not here.. oh well..
2293                  * a bit of protection is worth having..
2294                  */
2295                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2296 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2297                 atomic_add_int(&stcb->asoc.refcnt, 1);
2298                 SCTP_TCB_UNLOCK(stcb);
2299                 SCTP_SOCKET_LOCK(so, 1);
2300                 SCTP_TCB_LOCK(stcb);
2301                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2302                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2303                         SCTP_SOCKET_UNLOCK(so, 1);
2304                         return (NULL);
2305                 }
2306 #endif
2307                 soisconnected(stcb->sctp_socket);
2308 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2309                 SCTP_SOCKET_UNLOCK(so, 1);
2310 #endif
2311         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2312             (inp->sctp_socket->so_qlimit)) {
2313                 /*
2314                  * We don't want to do anything with this one. Since it is
2315                  * the listening guy. The timer will get started for
2316                  * accepted connections in the caller.
2317                  */
2318                 ;
2319         }
2320         /* since we did not send a HB make sure we don't double things */
2321         if ((netp) && (*netp))
2322                 (*netp)->hb_responded = 1;
2323
2324         if (stcb->asoc.sctp_autoclose_ticks &&
2325             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2326                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2327         }
2328         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2329         if ((netp) && (*netp)) {
2330                 /* calculate the RTT and set the encaps port */
2331                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2332                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2333                     SCTP_RTT_FROM_NON_DATA);
2334                 (*netp)->port = port;
2335         }
2336         /* respond with a COOKIE-ACK */
2337         sctp_send_cookie_ack(stcb);
2338
2339         /*
2340          * check the address lists for any ASCONFs that need to be sent
2341          * AFTER the cookie-ack is sent
2342          */
2343         sctp_check_address_list(stcb, m,
2344             initack_offset + sizeof(struct sctp_init_ack_chunk),
2345             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2346             &store.sa, cookie->local_scope, cookie->site_scope,
2347             cookie->ipv4_scope, cookie->loopback_scope);
2348
2349
2350         return (stcb);
2351 }
2352
2353 /*
2354  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2355  * we NEED to make sure we are not already using the vtag. If so we
2356  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2357         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2358                                                             SCTP_BASE_INFO(hashasocmark))];
2359         LIST_FOREACH(stcb, head, sctp_asocs) {
2360                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2361                        -- SEND ABORT - TRY AGAIN --
2362                 }
2363         }
2364 */
2365
2366 /*
2367  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2368  * existing (non-NULL) TCB
2369  */
2370 static struct mbuf *
2371 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2372     struct sockaddr *src, struct sockaddr *dst,
2373     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2374     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2375     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2376     struct sctp_tcb **locked_tcb,
2377     uint8_t mflowtype, uint32_t mflowid,
2378     uint32_t vrf_id, uint16_t port)
2379 {
2380         struct sctp_state_cookie *cookie;
2381         struct sctp_tcb *l_stcb = *stcb;
2382         struct sctp_inpcb *l_inp;
2383         struct sockaddr *to;
2384         struct sctp_pcb *ep;
2385         struct mbuf *m_sig;
2386         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2387         uint8_t *sig;
2388         uint8_t cookie_ok = 0;
2389         unsigned int sig_offset, cookie_offset;
2390         unsigned int cookie_len;
2391         struct timeval now;
2392         struct timeval time_expires;
2393         int notification = 0;
2394         struct sctp_nets *netl;
2395         int had_a_existing_tcb = 0;
2396         int send_int_conf = 0;
2397
2398 #ifdef INET
2399         struct sockaddr_in sin;
2400
2401 #endif
2402 #ifdef INET6
2403         struct sockaddr_in6 sin6;
2404
2405 #endif
2406
2407         SCTPDBG(SCTP_DEBUG_INPUT2,
2408             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2409
2410         if (inp_p == NULL) {
2411                 return (NULL);
2412         }
2413         cookie = &cp->cookie;
2414         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2415         cookie_len = ntohs(cp->ch.chunk_length);
2416
2417         if ((cookie->peerport != sh->src_port) &&
2418             (cookie->myport != sh->dest_port) &&
2419             (cookie->my_vtag != sh->v_tag)) {
2420                 /*
2421                  * invalid ports or bad tag.  Note that we always leave the
2422                  * v_tag in the header in network order and when we stored
2423                  * it in the my_vtag slot we also left it in network order.
2424                  * This maintains the match even though it may be in the
2425                  * opposite byte order of the machine :->
2426                  */
2427                 return (NULL);
2428         }
2429         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2430             sizeof(struct sctp_init_chunk) +
2431             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2432                 /* cookie too small */
2433                 return (NULL);
2434         }
2435         /*
2436          * split off the signature into its own mbuf (since it should not be
2437          * calculated in the sctp_hmac_m() call).
2438          */
2439         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2440         m_sig = m_split(m, sig_offset, M_NOWAIT);
2441         if (m_sig == NULL) {
2442                 /* out of memory or ?? */
2443                 return (NULL);
2444         }
2445 #ifdef SCTP_MBUF_LOGGING
2446         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2447                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2448         }
2449 #endif
2450
2451         /*
2452          * compute the signature/digest for the cookie
2453          */
2454         ep = &(*inp_p)->sctp_ep;
2455         l_inp = *inp_p;
2456         if (l_stcb) {
2457                 SCTP_TCB_UNLOCK(l_stcb);
2458         }
2459         SCTP_INP_RLOCK(l_inp);
2460         if (l_stcb) {
2461                 SCTP_TCB_LOCK(l_stcb);
2462         }
2463         /* which cookie is it? */
2464         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2465             (ep->current_secret_number != ep->last_secret_number)) {
2466                 /* it's the old cookie */
2467                 (void)sctp_hmac_m(SCTP_HMAC,
2468                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2469                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2470         } else {
2471                 /* it's the current cookie */
2472                 (void)sctp_hmac_m(SCTP_HMAC,
2473                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2474                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2475         }
2476         /* get the signature */
2477         SCTP_INP_RUNLOCK(l_inp);
2478         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2479         if (sig == NULL) {
2480                 /* couldn't find signature */
2481                 sctp_m_freem(m_sig);
2482                 return (NULL);
2483         }
2484         /* compare the received digest with the computed digest */
2485         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2486                 /* try the old cookie? */
2487                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2488                     (ep->current_secret_number != ep->last_secret_number)) {
2489                         /* compute digest with old */
2490                         (void)sctp_hmac_m(SCTP_HMAC,
2491                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2492                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2493                         /* compare */
2494                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2495                                 cookie_ok = 1;
2496                 }
2497         } else {
2498                 cookie_ok = 1;
2499         }
2500
2501         /*
2502          * Now before we continue we must reconstruct our mbuf so that
2503          * normal processing of any other chunks will work.
2504          */
2505         {
2506                 struct mbuf *m_at;
2507
2508                 m_at = m;
2509                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2510                         m_at = SCTP_BUF_NEXT(m_at);
2511                 }
2512                 SCTP_BUF_NEXT(m_at) = m_sig;
2513         }
2514
2515         if (cookie_ok == 0) {
2516                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2517                 SCTPDBG(SCTP_DEBUG_INPUT2,
2518                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2519                     (uint32_t) offset, cookie_offset, sig_offset);
2520                 return (NULL);
2521         }
2522         /*
2523          * check the cookie timestamps to be sure it's not stale
2524          */
2525         (void)SCTP_GETTIME_TIMEVAL(&now);
2526         /* Expire time is in Ticks, so we convert to seconds */
2527         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2528         time_expires.tv_usec = cookie->time_entered.tv_usec;
2529         /*
2530          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2531          * is undefined.
2532          */
2533         if (timevalcmp(&now, &time_expires, >)) {
2534                 /* cookie is stale! */
2535                 struct mbuf *op_err;
2536                 struct sctp_stale_cookie_msg *scm;
2537                 uint32_t tim;
2538
2539                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2540                     0, M_NOWAIT, 1, MT_DATA);
2541                 if (op_err == NULL) {
2542                         /* FOOBAR */
2543                         return (NULL);
2544                 }
2545                 /* Set the len */
2546                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2547                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2548                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2549                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2550                     (sizeof(uint32_t))));
2551                 /* seconds to usec */
2552                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2553                 /* add in usec */
2554                 if (tim == 0)
2555                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2556                 scm->time_usec = htonl(tim);
2557                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2558                     mflowtype, mflowid,
2559                     vrf_id, port);
2560                 return (NULL);
2561         }
2562         /*
2563          * Now we must see with the lookup address if we have an existing
2564          * asoc. This will only happen if we were in the COOKIE-WAIT state
2565          * and a INIT collided with us and somewhere the peer sent the
2566          * cookie on another address besides the single address our assoc
2567          * had for him. In this case we will have one of the tie-tags set at
2568          * least AND the address field in the cookie can be used to look it
2569          * up.
2570          */
2571         to = NULL;
2572         switch (cookie->addr_type) {
2573 #ifdef INET6
2574         case SCTP_IPV6_ADDRESS:
2575                 memset(&sin6, 0, sizeof(sin6));
2576                 sin6.sin6_family = AF_INET6;
2577                 sin6.sin6_len = sizeof(sin6);
2578                 sin6.sin6_port = sh->src_port;
2579                 sin6.sin6_scope_id = cookie->scope_id;
2580                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2581                     sizeof(sin6.sin6_addr.s6_addr));
2582                 to = (struct sockaddr *)&sin6;
2583                 break;
2584 #endif
2585 #ifdef INET
2586         case SCTP_IPV4_ADDRESS:
2587                 memset(&sin, 0, sizeof(sin));
2588                 sin.sin_family = AF_INET;
2589                 sin.sin_len = sizeof(sin);
2590                 sin.sin_port = sh->src_port;
2591                 sin.sin_addr.s_addr = cookie->address[0];
2592                 to = (struct sockaddr *)&sin;
2593                 break;
2594 #endif
2595         default:
2596                 /* This should not happen */
2597                 return (NULL);
2598         }
2599         if (*stcb == NULL) {
2600                 /* Yep, lets check */
2601                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2602                 if (*stcb == NULL) {
2603                         /*
2604                          * We should have only got back the same inp. If we
2605                          * got back a different ep we have a problem. The
2606                          * original findep got back l_inp and now
2607                          */
2608                         if (l_inp != *inp_p) {
2609                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2610                         }
2611                 } else {
2612                         if (*locked_tcb == NULL) {
2613                                 /*
2614                                  * In this case we found the assoc only
2615                                  * after we locked the create lock. This
2616                                  * means we are in a colliding case and we
2617                                  * must make sure that we unlock the tcb if
2618                                  * its one of the cases where we throw away
2619                                  * the incoming packets.
2620                                  */
2621                                 *locked_tcb = *stcb;
2622
2623                                 /*
2624                                  * We must also increment the inp ref count
2625                                  * since the ref_count flags was set when we
2626                                  * did not find the TCB, now we found it
2627                                  * which reduces the refcount.. we must
2628                                  * raise it back out to balance it all :-)
2629                                  */
2630                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2631                                 if ((*stcb)->sctp_ep != l_inp) {
2632                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2633                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2634                                 }
2635                         }
2636                 }
2637         }
2638         cookie_len -= SCTP_SIGNATURE_SIZE;
2639         if (*stcb == NULL) {
2640                 /* this is the "normal" case... get a new TCB */
2641                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2642                     cookie, cookie_len, *inp_p,
2643                     netp, to, &notification,
2644                     auth_skipped, auth_offset, auth_len,
2645                     mflowtype, mflowid,
2646                     vrf_id, port);
2647         } else {
2648                 /* this is abnormal... cookie-echo on existing TCB */
2649                 had_a_existing_tcb = 1;
2650                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2651                     src, dst, sh,
2652                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2653                     &notification, auth_skipped, auth_offset, auth_len,
2654                     mflowtype, mflowid,
2655                     vrf_id, port);
2656         }
2657
2658         if (*stcb == NULL) {
2659                 /* still no TCB... must be bad cookie-echo */
2660                 return (NULL);
2661         }
2662         if ((*netp != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
2663                 (*netp)->flowtype = mflowtype;
2664         }
2665         /*
2666          * Ok, we built an association so confirm the address we sent the
2667          * INIT-ACK to.
2668          */
2669         netl = sctp_findnet(*stcb, to);
2670         /*
2671          * This code should in theory NOT run but
2672          */
2673         if (netl == NULL) {
2674                 /* TSNH! Huh, why do I need to add this address here? */
2675                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2676                         return (NULL);
2677                 }
2678                 netl = sctp_findnet(*stcb, to);
2679         }
2680         if (netl) {
2681                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2682                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2683                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2684                             netl);
2685                         send_int_conf = 1;
2686                 }
2687         }
2688         sctp_start_net_timers(*stcb);
2689         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2690                 if (!had_a_existing_tcb ||
2691                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2692                         /*
2693                          * If we have a NEW cookie or the connect never
2694                          * reached the connected state during collision we
2695                          * must do the TCP accept thing.
2696                          */
2697                         struct socket *so, *oso;
2698                         struct sctp_inpcb *inp;
2699
2700                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2701                                 /*
2702                                  * For a restart we will keep the same
2703                                  * socket, no need to do anything. I THINK!!
2704                                  */
2705                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2706                                 if (send_int_conf) {
2707                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2708                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2709                                 }
2710                                 return (m);
2711                         }
2712                         oso = (*inp_p)->sctp_socket;
2713                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2714                         SCTP_TCB_UNLOCK((*stcb));
2715                         CURVNET_SET(oso->so_vnet);
2716                         so = sonewconn(oso, 0
2717                             );
2718                         CURVNET_RESTORE();
2719                         SCTP_TCB_LOCK((*stcb));
2720                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2721
2722                         if (so == NULL) {
2723                                 struct mbuf *op_err;
2724
2725 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2726                                 struct socket *pcb_so;
2727
2728 #endif
2729                                 /* Too many sockets */
2730                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2731                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2732                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2733                                     src, dst, sh, op_err,
2734                                     mflowtype, mflowid,
2735                                     vrf_id, port);
2736 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2737                                 pcb_so = SCTP_INP_SO(*inp_p);
2738                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2739                                 SCTP_TCB_UNLOCK((*stcb));
2740                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2741                                 SCTP_TCB_LOCK((*stcb));
2742                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2743 #endif
2744                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2745 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2746                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2747 #endif
2748                                 return (NULL);
2749                         }
2750                         inp = (struct sctp_inpcb *)so->so_pcb;
2751                         SCTP_INP_INCR_REF(inp);
2752                         /*
2753                          * We add the unbound flag here so that if we get an
2754                          * soabort() before we get the move_pcb done, we
2755                          * will properly cleanup.
2756                          */
2757                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2758                             SCTP_PCB_FLAGS_CONNECTED |
2759                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2760                             SCTP_PCB_FLAGS_UNBOUND |
2761                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2762                             SCTP_PCB_FLAGS_DONT_WAKE);
2763                         inp->sctp_features = (*inp_p)->sctp_features;
2764                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2765                         inp->sctp_socket = so;
2766                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2767                         inp->max_cwnd = (*inp_p)->max_cwnd;
2768                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2769                         inp->ecn_supported = (*inp_p)->ecn_supported;
2770                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2771                         inp->auth_supported = (*inp_p)->auth_supported;
2772                         inp->asconf_supported = (*inp_p)->asconf_supported;
2773                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2774                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2775                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2776                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2777                         inp->sctp_context = (*inp_p)->sctp_context;
2778                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2779                         inp->inp_starting_point_for_iterator = NULL;
2780                         /*
2781                          * copy in the authentication parameters from the
2782                          * original endpoint
2783                          */
2784                         if (inp->sctp_ep.local_hmacs)
2785                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2786                         inp->sctp_ep.local_hmacs =
2787                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2788                         if (inp->sctp_ep.local_auth_chunks)
2789                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2790                         inp->sctp_ep.local_auth_chunks =
2791                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2792
2793                         /*
2794                          * Now we must move it from one hash table to
2795                          * another and get the tcb in the right place.
2796                          */
2797
2798                         /*
2799                          * This is where the one-2-one socket is put into
2800                          * the accept state waiting for the accept!
2801                          */
2802                         if (*stcb) {
2803                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2804                         }
2805                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2806
2807                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2808                         SCTP_TCB_UNLOCK((*stcb));
2809
2810                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2811                             0);
2812                         SCTP_TCB_LOCK((*stcb));
2813                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2814
2815
2816                         /*
2817                          * now we must check to see if we were aborted while
2818                          * the move was going on and the lock/unlock
2819                          * happened.
2820                          */
2821                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2822                                 /*
2823                                  * yep it was, we leave the assoc attached
2824                                  * to the socket since the sctp_inpcb_free()
2825                                  * call will send an abort for us.
2826                                  */
2827                                 SCTP_INP_DECR_REF(inp);
2828                                 return (NULL);
2829                         }
2830                         SCTP_INP_DECR_REF(inp);
2831                         /* Switch over to the new guy */
2832                         *inp_p = inp;
2833                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2834                         if (send_int_conf) {
2835                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2836                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2837                         }
2838                         /*
2839                          * Pull it from the incomplete queue and wake the
2840                          * guy
2841                          */
2842 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2843                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2844                         SCTP_TCB_UNLOCK((*stcb));
2845                         SCTP_SOCKET_LOCK(so, 1);
2846 #endif
2847                         soisconnected(so);
2848 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2849                         SCTP_TCB_LOCK((*stcb));
2850                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2851                         SCTP_SOCKET_UNLOCK(so, 1);
2852 #endif
2853                         return (m);
2854                 }
2855         }
2856         if (notification) {
2857                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2858         }
2859         if (send_int_conf) {
2860                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2861                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2862         }
2863         return (m);
2864 }
2865
2866 static void
2867 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2868     struct sctp_tcb *stcb, struct sctp_nets *net)
2869 {
2870         /* cp must not be used, others call this without a c-ack :-) */
2871         struct sctp_association *asoc;
2872
2873         SCTPDBG(SCTP_DEBUG_INPUT2,
2874             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2875         if ((stcb == NULL) || (net == NULL)) {
2876                 return;
2877         }
2878         asoc = &stcb->asoc;
2879
2880         sctp_stop_all_cookie_timers(stcb);
2881         /* process according to association state */
2882         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2883                 /* state change only needed when I am in right state */
2884                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2885                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2886                 sctp_start_net_timers(stcb);
2887                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2888                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2889                             stcb->sctp_ep, stcb, asoc->primary_destination);
2890
2891                 }
2892                 /* update RTO */
2893                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2894                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2895                 if (asoc->overall_error_count == 0) {
2896                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2897                             &asoc->time_entered, sctp_align_safe_nocopy,
2898                             SCTP_RTT_FROM_NON_DATA);
2899                 }
2900                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2901                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2902                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2903                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2904 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2905                         struct socket *so;
2906
2907 #endif
2908                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2909 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2910                         so = SCTP_INP_SO(stcb->sctp_ep);
2911                         atomic_add_int(&stcb->asoc.refcnt, 1);
2912                         SCTP_TCB_UNLOCK(stcb);
2913                         SCTP_SOCKET_LOCK(so, 1);
2914                         SCTP_TCB_LOCK(stcb);
2915                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2916 #endif
2917                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2918                                 soisconnected(stcb->sctp_socket);
2919                         }
2920 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2921                         SCTP_SOCKET_UNLOCK(so, 1);
2922 #endif
2923                 }
2924                 /*
2925                  * since we did not send a HB make sure we don't double
2926                  * things
2927                  */
2928                 net->hb_responded = 1;
2929
2930                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2931                         /*
2932                          * We don't need to do the asconf thing, nor hb or
2933                          * autoclose if the socket is closed.
2934                          */
2935                         goto closed_socket;
2936                 }
2937                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2938                     stcb, net);
2939
2940
2941                 if (stcb->asoc.sctp_autoclose_ticks &&
2942                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2943                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2944                             stcb->sctp_ep, stcb, NULL);
2945                 }
2946                 /*
2947                  * send ASCONF if parameters are pending and ASCONFs are
2948                  * allowed (eg. addresses changed when init/cookie echo were
2949                  * in flight)
2950                  */
2951                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2952                     (stcb->asoc.asconf_supported == 1) &&
2953                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2954 #ifdef SCTP_TIMER_BASED_ASCONF
2955                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2956                             stcb->sctp_ep, stcb,
2957                             stcb->asoc.primary_destination);
2958 #else
2959                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2960                             SCTP_ADDR_NOT_LOCKED);
2961 #endif
2962                 }
2963         }
2964 closed_socket:
2965         /* Toss the cookie if I can */
2966         sctp_toss_old_cookies(stcb, asoc);
2967         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2968                 /* Restart the timer if we have pending data */
2969                 struct sctp_tmit_chunk *chk;
2970
2971                 chk = TAILQ_FIRST(&asoc->sent_queue);
2972                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2973         }
2974 }
2975
2976 static void
2977 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2978     struct sctp_tcb *stcb)
2979 {
2980         struct sctp_nets *net;
2981         struct sctp_tmit_chunk *lchk;
2982         struct sctp_ecne_chunk bkup;
2983         uint8_t override_bit;
2984         uint32_t tsn, window_data_tsn;
2985         int len;
2986         unsigned int pkt_cnt;
2987
2988         len = ntohs(cp->ch.chunk_length);
2989         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2990             (len != sizeof(struct old_sctp_ecne_chunk))) {
2991                 return;
2992         }
2993         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2994                 /* Its the old format */
2995                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2996                 bkup.num_pkts_since_cwr = htonl(1);
2997                 cp = &bkup;
2998         }
2999         SCTP_STAT_INCR(sctps_recvecne);
3000         tsn = ntohl(cp->tsn);
3001         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3002         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3003         if (lchk == NULL) {
3004                 window_data_tsn = stcb->asoc.sending_seq - 1;
3005         } else {
3006                 window_data_tsn = lchk->rec.data.TSN_seq;
3007         }
3008
3009         /* Find where it was sent to if possible. */
3010         net = NULL;
3011         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3012                 if (lchk->rec.data.TSN_seq == tsn) {
3013                         net = lchk->whoTo;
3014                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3015                         break;
3016                 }
3017                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3018                         break;
3019                 }
3020         }
3021         if (net == NULL) {
3022                 /*
3023                  * What to do. A previous send of a CWR was possibly lost.
3024                  * See how old it is, we may have it marked on the actual
3025                  * net.
3026                  */
3027                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3028                         if (tsn == net->last_cwr_tsn) {
3029                                 /* Found him, send it off */
3030                                 break;
3031                         }
3032                 }
3033                 if (net == NULL) {
3034                         /*
3035                          * If we reach here, we need to send a special CWR
3036                          * that says hey, we did this a long time ago and
3037                          * you lost the response.
3038                          */
3039                         net = TAILQ_FIRST(&stcb->asoc.nets);
3040                         if (net == NULL) {
3041                                 /* TSNH */
3042                                 return;
3043                         }
3044                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3045                 } else {
3046                         override_bit = 0;
3047                 }
3048         } else {
3049                 override_bit = 0;
3050         }
3051         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3052             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3053                 /*
3054                  * JRS - Use the congestion control given in the pluggable
3055                  * CC module
3056                  */
3057                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3058                 /*
3059                  * We reduce once every RTT. So we will only lower cwnd at
3060                  * the next sending seq i.e. the window_data_tsn
3061                  */
3062                 net->cwr_window_tsn = window_data_tsn;
3063                 net->ecn_ce_pkt_cnt += pkt_cnt;
3064                 net->lost_cnt = pkt_cnt;
3065                 net->last_cwr_tsn = tsn;
3066         } else {
3067                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3068                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3069                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3070                         /*
3071                          * Another loss in the same window update how many
3072                          * marks/packets lost we have had.
3073                          */
3074                         int cnt = 1;
3075
3076                         if (pkt_cnt > net->lost_cnt) {
3077                                 /* Should be the case */
3078                                 cnt = (pkt_cnt - net->lost_cnt);
3079                                 net->ecn_ce_pkt_cnt += cnt;
3080                         }
3081                         net->lost_cnt = pkt_cnt;
3082                         net->last_cwr_tsn = tsn;
3083                         /*
3084                          * Most CC functions will ignore this call, since we
3085                          * are in-window yet of the initial CE the peer saw.
3086                          */
3087                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3088                 }
3089         }
3090         /*
3091          * We always send a CWR this way if our previous one was lost our
3092          * peer will get an update, or if it is not time again to reduce we
3093          * still get the cwr to the peer. Note we set the override when we
3094          * could not find the TSN on the chunk or the destination network.
3095          */
3096         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3097 }
3098
3099 static void
3100 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3101 {
3102         /*
3103          * Here we get a CWR from the peer. We must look in the outqueue and
3104          * make sure that we have a covered ECNE in the control chunk part.
3105          * If so remove it.
3106          */
3107         struct sctp_tmit_chunk *chk;
3108         struct sctp_ecne_chunk *ecne;
3109         int override;
3110         uint32_t cwr_tsn;
3111
3112         cwr_tsn = ntohl(cp->tsn);
3113         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3114         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3115                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3116                         continue;
3117                 }
3118                 if ((override == 0) && (chk->whoTo != net)) {
3119                         /* Must be from the right src unless override is set */
3120                         continue;
3121                 }
3122                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3123                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3124                         /* this covers this ECNE, we can remove it */
3125                         stcb->asoc.ecn_echo_cnt_onq--;
3126                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3127                             sctp_next);
3128                         sctp_m_freem(chk->data);
3129                         chk->data = NULL;
3130                         stcb->asoc.ctrl_queue_cnt--;
3131                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3132                         if (override == 0) {
3133                                 break;
3134                         }
3135                 }
3136         }
3137 }
3138
3139 static void
3140 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3141     struct sctp_tcb *stcb, struct sctp_nets *net)
3142 {
3143         struct sctp_association *asoc;
3144
3145 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3146         struct socket *so;
3147
3148 #endif
3149
3150         SCTPDBG(SCTP_DEBUG_INPUT2,
3151             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3152         if (stcb == NULL)
3153                 return;
3154
3155         asoc = &stcb->asoc;
3156         /* process according to association state */
3157         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3158                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3159                 SCTPDBG(SCTP_DEBUG_INPUT2,
3160                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3161                 SCTP_TCB_UNLOCK(stcb);
3162                 return;
3163         }
3164         /* notify upper layer protocol */
3165         if (stcb->sctp_socket) {
3166                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3167         }
3168 #ifdef INVARIANTS
3169         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3170             !TAILQ_EMPTY(&asoc->sent_queue) ||
3171             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3172                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3173         }
3174 #endif
3175         /* stop the timer */
3176         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3177         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3178         /* free the TCB */
3179         SCTPDBG(SCTP_DEBUG_INPUT2,
3180             "sctp_handle_shutdown_complete: calls free-asoc\n");
3181 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3182         so = SCTP_INP_SO(stcb->sctp_ep);
3183         atomic_add_int(&stcb->asoc.refcnt, 1);
3184         SCTP_TCB_UNLOCK(stcb);
3185         SCTP_SOCKET_LOCK(so, 1);
3186         SCTP_TCB_LOCK(stcb);
3187         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3188 #endif
3189         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3190 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3191         SCTP_SOCKET_UNLOCK(so, 1);
3192 #endif
3193         return;
3194 }
3195
3196 static int
3197 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3198     struct sctp_nets *net, uint8_t flg)
3199 {
3200         switch (desc->chunk_type) {
3201         case SCTP_DATA:
3202                 /* find the tsn to resend (possibly */
3203                 {
3204                         uint32_t tsn;
3205                         struct sctp_tmit_chunk *tp1;
3206
3207                         tsn = ntohl(desc->tsn_ifany);
3208                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3209                                 if (tp1->rec.data.TSN_seq == tsn) {
3210                                         /* found it */
3211                                         break;
3212                                 }
3213                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3214                                         /* not found */
3215                                         tp1 = NULL;
3216                                         break;
3217                                 }
3218                         }
3219                         if (tp1 == NULL) {
3220                                 /*
3221                                  * Do it the other way , aka without paying
3222                                  * attention to queue seq order.
3223                                  */
3224                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3225                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3226                                         if (tp1->rec.data.TSN_seq == tsn) {
3227                                                 /* found it */
3228                                                 break;
3229                                         }
3230                                 }
3231                         }
3232                         if (tp1 == NULL) {
3233                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3234                         }
3235                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3236                                 uint8_t *ddp;
3237
3238                                 if (((flg & SCTP_BADCRC) == 0) &&
3239                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3240                                         return (0);
3241                                 }
3242                                 if ((stcb->asoc.peers_rwnd == 0) &&
3243                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3244                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3245                                         return (0);
3246                                 }
3247                                 if (stcb->asoc.peers_rwnd == 0 &&
3248                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3249                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3250                                         return (0);
3251                                 }
3252                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3253                                     sizeof(struct sctp_data_chunk));
3254                                 {
3255                                         unsigned int iii;
3256
3257                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3258                                             iii++) {
3259                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3260                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3261                                                         return (-1);
3262                                                 }
3263                                         }
3264                                 }
3265
3266                                 if (tp1->do_rtt) {
3267                                         /*
3268                                          * this guy had a RTO calculation
3269                                          * pending on it, cancel it
3270                                          */
3271                                         if (tp1->whoTo->rto_needed == 0) {
3272                                                 tp1->whoTo->rto_needed = 1;
3273                                         }
3274                                         tp1->do_rtt = 0;
3275                                 }
3276                                 SCTP_STAT_INCR(sctps_pdrpmark);
3277                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3278                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3279                                 /*
3280                                  * mark it as if we were doing a FR, since
3281                                  * we will be getting gap ack reports behind
3282                                  * the info from the router.
3283                                  */
3284                                 tp1->rec.data.doing_fast_retransmit = 1;
3285                                 /*
3286                                  * mark the tsn with what sequences can
3287                                  * cause a new FR.
3288                                  */
3289                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3290                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3291                                 } else {
3292                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3293                                 }
3294
3295                                 /* restart the timer */
3296                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3297                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3298                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3299                                     stcb, tp1->whoTo);
3300
3301                                 /* fix counts and things */
3302                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3303                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3304                                             tp1->whoTo->flight_size,
3305                                             tp1->book_size,
3306                                             (uintptr_t) stcb,
3307                                             tp1->rec.data.TSN_seq);
3308                                 }
3309                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3310                                         sctp_flight_size_decrease(tp1);
3311                                         sctp_total_flight_decrease(stcb, tp1);
3312                                 }
3313                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3314                         } {
3315                                 /* audit code */
3316                                 unsigned int audit;
3317
3318                                 audit = 0;
3319                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3320                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3321                                                 audit++;
3322                                 }
3323                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3324                                     sctp_next) {
3325                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3326                                                 audit++;
3327                                 }
3328                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3329                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3330                                             audit, stcb->asoc.sent_queue_retran_cnt);
3331 #ifndef SCTP_AUDITING_ENABLED
3332                                         stcb->asoc.sent_queue_retran_cnt = audit;
3333 #endif
3334                                 }
3335                         }
3336                 }
3337                 break;
3338         case SCTP_ASCONF:
3339                 {
3340                         struct sctp_tmit_chunk *asconf;
3341
3342                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3343                             sctp_next) {
3344                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3345                                         break;
3346                                 }
3347                         }
3348                         if (asconf) {
3349                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3350                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3351                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3352                                 asconf->snd_count--;
3353                         }
3354                 }
3355                 break;
3356         case SCTP_INITIATION:
3357                 /* resend the INIT */
3358                 stcb->asoc.dropped_special_cnt++;
3359                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3360                         /*
3361                          * If we can get it in, in a few attempts we do
3362                          * this, otherwise we let the timer fire.
3363                          */
3364                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3365                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3366                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3367                 }
3368                 break;
3369         case SCTP_SELECTIVE_ACK:
3370         case SCTP_NR_SELECTIVE_ACK:
3371                 /* resend the sack */
3372                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3373                 break;
3374         case SCTP_HEARTBEAT_REQUEST:
3375                 /* resend a demand HB */
3376                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3377                         /*
3378                          * Only retransmit if we KNOW we wont destroy the
3379                          * tcb
3380                          */
3381                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3382                 }
3383                 break;
3384         case SCTP_SHUTDOWN:
3385                 sctp_send_shutdown(stcb, net);
3386                 break;
3387         case SCTP_SHUTDOWN_ACK:
3388                 sctp_send_shutdown_ack(stcb, net);
3389                 break;
3390         case SCTP_COOKIE_ECHO:
3391                 {
3392                         struct sctp_tmit_chunk *cookie;
3393
3394                         cookie = NULL;
3395                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3396                             sctp_next) {
3397                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3398                                         break;
3399                                 }
3400                         }
3401                         if (cookie) {
3402                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3403                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3404                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3405                                 sctp_stop_all_cookie_timers(stcb);
3406                         }
3407                 }
3408                 break;
3409         case SCTP_COOKIE_ACK:
3410                 sctp_send_cookie_ack(stcb);
3411                 break;
3412         case SCTP_ASCONF_ACK:
3413                 /* resend last asconf ack */
3414                 sctp_send_asconf_ack(stcb);
3415                 break;
3416         case SCTP_FORWARD_CUM_TSN:
3417                 send_forward_tsn(stcb, &stcb->asoc);
3418                 break;
3419                 /* can't do anything with these */
3420         case SCTP_PACKET_DROPPED:
3421         case SCTP_INITIATION_ACK:       /* this should not happen */
3422         case SCTP_HEARTBEAT_ACK:
3423         case SCTP_ABORT_ASSOCIATION:
3424         case SCTP_OPERATION_ERROR:
3425         case SCTP_SHUTDOWN_COMPLETE:
3426         case SCTP_ECN_ECHO:
3427         case SCTP_ECN_CWR:
3428         default:
3429                 break;
3430         }
3431         return (0);
3432 }
3433
3434 void
3435 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3436 {
3437         uint32_t i;
3438         uint16_t temp;
3439
3440         /*
3441          * We set things to 0xffff since this is the last delivered sequence
3442          * and we will be sending in 0 after the reset.
3443          */
3444
3445         if (number_entries) {
3446                 for (i = 0; i < number_entries; i++) {
3447                         temp = ntohs(list[i]);
3448                         if (temp >= stcb->asoc.streamincnt) {
3449                                 continue;
3450                         }
3451                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3452                 }
3453         } else {
3454                 list = NULL;
3455                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3456                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3457                 }
3458         }
3459         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3460 }
3461
3462 static void
3463 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3464 {
3465         uint32_t i;
3466         uint16_t temp;
3467
3468         if (number_entries > 0) {
3469                 for (i = 0; i < number_entries; i++) {
3470                         temp = ntohs(list[i]);
3471                         if (temp >= stcb->asoc.streamoutcnt) {
3472                                 /* no such stream */
3473                                 continue;
3474                         }
3475                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3476                 }
3477         } else {
3478                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3479                         stcb->asoc.strmout[i].next_sequence_send = 0;
3480                 }
3481         }
3482         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3483 }
3484
3485
3486 struct sctp_stream_reset_request *
3487 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3488 {
3489         struct sctp_association *asoc;
3490         struct sctp_chunkhdr *ch;
3491         struct sctp_stream_reset_request *r;
3492         struct sctp_tmit_chunk *chk;
3493         int len, clen;
3494
3495         asoc = &stcb->asoc;
3496         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3497                 asoc->stream_reset_outstanding = 0;
3498                 return (NULL);
3499         }
3500         if (stcb->asoc.str_reset == NULL) {
3501                 asoc->stream_reset_outstanding = 0;
3502                 return (NULL);
3503         }
3504         chk = stcb->asoc.str_reset;
3505         if (chk->data == NULL) {
3506                 return (NULL);
3507         }
3508         if (bchk) {
3509                 /* he wants a copy of the chk pointer */
3510                 *bchk = chk;
3511         }
3512         clen = chk->send_size;
3513         ch = mtod(chk->data, struct sctp_chunkhdr *);
3514         r = (struct sctp_stream_reset_request *)(ch + 1);
3515         if (ntohl(r->request_seq) == seq) {
3516                 /* found it */
3517                 return (r);
3518         }
3519         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3520         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3521                 /* move to the next one, there can only be a max of two */
3522                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3523                 if (ntohl(r->request_seq) == seq) {
3524                         return (r);
3525                 }
3526         }
3527         /* that seq is not here */
3528         return (NULL);
3529 }
3530
3531 static void
3532 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3533 {
3534         struct sctp_association *asoc;
3535         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3536
3537         if (stcb->asoc.str_reset == NULL) {
3538                 return;
3539         }
3540         asoc = &stcb->asoc;
3541
3542         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3543         TAILQ_REMOVE(&asoc->control_send_queue,
3544             chk,
3545             sctp_next);
3546         if (chk->data) {
3547                 sctp_m_freem(chk->data);
3548                 chk->data = NULL;
3549         }
3550         asoc->ctrl_queue_cnt--;
3551         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3552         /* sa_ignore NO_NULL_CHK */
3553         stcb->asoc.str_reset = NULL;
3554 }
3555
3556
3557 static int
3558 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3559     uint32_t seq, uint32_t action,
3560     struct sctp_stream_reset_response *respin)
3561 {
3562         uint16_t type;
3563         int lparm_len;
3564         struct sctp_association *asoc = &stcb->asoc;
3565         struct sctp_tmit_chunk *chk;
3566         struct sctp_stream_reset_request *req_param;
3567         struct sctp_stream_reset_out_request *req_out_param;
3568         struct sctp_stream_reset_in_request *req_in_param;
3569         uint32_t number_entries;
3570
3571         if (asoc->stream_reset_outstanding == 0) {
3572                 /* duplicate */
3573                 return (0);
3574         }
3575         if (seq == stcb->asoc.str_reset_seq_out) {
3576                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3577                 if (req_param != NULL) {
3578                         stcb->asoc.str_reset_seq_out++;
3579                         type = ntohs(req_param->ph.param_type);
3580                         lparm_len = ntohs(req_param->ph.param_length);
3581                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3582                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3583                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3584                                 asoc->stream_reset_out_is_outstanding = 0;
3585                                 if (asoc->stream_reset_outstanding)
3586                                         asoc->stream_reset_outstanding--;
3587                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3588                                         /* do it */
3589                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3590                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3591                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3592                                 } else {
3593                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3594                                 }
3595                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3596                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3597                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3598                                 if (asoc->stream_reset_outstanding)
3599                                         asoc->stream_reset_outstanding--;
3600                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3601                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3602                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3603                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3604                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3605                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3606                                 }
3607                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3608                                 /* Ok we now may have more streams */
3609                                 int num_stream;
3610
3611                                 num_stream = stcb->asoc.strm_pending_add_size;
3612                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3613                                         /* TSNH */
3614                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3615                                 }
3616                                 stcb->asoc.strm_pending_add_size = 0;
3617                                 if (asoc->stream_reset_outstanding)
3618                                         asoc->stream_reset_outstanding--;
3619                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3620                                         /* Put the new streams into effect */
3621                                         stcb->asoc.streamoutcnt += num_stream;
3622                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3623                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3624                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3625                                             SCTP_STREAM_CHANGE_DENIED);
3626                                 } else {
3627                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3628                                             SCTP_STREAM_CHANGE_FAILED);
3629                                 }
3630                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3631                                 if (asoc->stream_reset_outstanding)
3632                                         asoc->stream_reset_outstanding--;
3633                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3634                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3635                                             SCTP_STREAM_CHANGE_DENIED);
3636                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3637                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3638                                             SCTP_STREAM_CHANGE_FAILED);
3639                                 }
3640                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3641                                 /**
3642                                  * a) Adopt the new in tsn.
3643                                  * b) reset the map
3644                                  * c) Adopt the new out-tsn
3645                                  */
3646                                 struct sctp_stream_reset_response_tsn *resp;
3647                                 struct sctp_forward_tsn_chunk fwdtsn;
3648                                 int abort_flag = 0;
3649
3650                                 if (respin == NULL) {
3651                                         /* huh ? */
3652                                         return (0);
3653                                 }
3654                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3655                                         return (0);
3656                                 }
3657                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3658                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3659                                         asoc->stream_reset_outstanding--;
3660                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3661                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3662                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3663                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3664                                         if (abort_flag) {
3665                                                 return (1);
3666                                         }
3667                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3668                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3669                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3670                                         }
3671                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3672                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3673                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3674
3675                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3676                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3677
3678                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3679                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3680
3681                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3682                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3683                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3684                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3685                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3686                                             SCTP_ASSOC_RESET_DENIED);
3687                                 } else {
3688                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3689                                             SCTP_ASSOC_RESET_FAILED);
3690                                 }
3691                         }
3692                         /* get rid of the request and get the request flags */
3693                         if (asoc->stream_reset_outstanding == 0) {
3694                                 sctp_clean_up_stream_reset(stcb);
3695                         }
3696                 }
3697         }
3698         return (0);
3699 }
3700
3701 static void
3702 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3703     struct sctp_tmit_chunk *chk,
3704     struct sctp_stream_reset_in_request *req, int trunc)
3705 {
3706         uint32_t seq;
3707         int len, i;
3708         int number_entries;
3709         uint16_t temp;
3710
3711         /*
3712          * peer wants me to send a str-reset to him for my outgoing seq's if
3713          * seq_in is right.
3714          */
3715         struct sctp_association *asoc = &stcb->asoc;
3716
3717         seq = ntohl(req->request_seq);
3718         if (asoc->str_reset_seq_in == seq) {
3719                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3720                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3721                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3722                 } else if (trunc) {
3723                         /* Can't do it, since they exceeded our buffer size  */
3724                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3725                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3726                         len = ntohs(req->ph.param_length);
3727                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3728                         for (i = 0; i < number_entries; i++) {
3729                                 temp = ntohs(req->list_of_streams[i]);
3730                                 req->list_of_streams[i] = temp;
3731                         }
3732                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3733                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3734                             asoc->str_reset_seq_out,
3735                             seq, (asoc->sending_seq - 1));
3736                         asoc->stream_reset_out_is_outstanding = 1;
3737                         asoc->str_reset = chk;
3738                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3739                         stcb->asoc.stream_reset_outstanding++;
3740                 } else {
3741                         /* Can't do it, since we have sent one out */
3742                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3743                 }
3744                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3745                 asoc->str_reset_seq_in++;
3746         } else if (asoc->str_reset_seq_in - 1 == seq) {
3747                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3748         } else if (asoc->str_reset_seq_in - 2 == seq) {
3749                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3750         } else {
3751                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3752         }
3753 }
3754
3755 static int
3756 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3757     struct sctp_tmit_chunk *chk,
3758     struct sctp_stream_reset_tsn_request *req)
3759 {
3760         /* reset all in and out and update the tsn */
3761         /*
3762          * A) reset my str-seq's on in and out. B) Select a receive next,
3763          * and set cum-ack to it. Also process this selected number as a
3764          * fwd-tsn as well. C) set in the response my next sending seq.
3765          */
3766         struct sctp_forward_tsn_chunk fwdtsn;
3767         struct sctp_association *asoc = &stcb->asoc;
3768         int abort_flag = 0;
3769         uint32_t seq;
3770
3771         seq = ntohl(req->request_seq);
3772         if (asoc->str_reset_seq_in == seq) {
3773                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3774                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3775                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3776                 } else {
3777                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3778                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3779                         fwdtsn.ch.chunk_flags = 0;
3780                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3781                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3782                         if (abort_flag) {
3783                                 return (1);
3784                         }
3785                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3786                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3787                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3788                         }
3789                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3790                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3791                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3792                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3793                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3794                         atomic_add_int(&asoc->sending_seq, 1);
3795                         /* save off historical data for retrans */
3796                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3797                         asoc->last_sending_seq[0] = asoc->sending_seq;
3798                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3799                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3800                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3801                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3802                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3803                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3804                 }
3805                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3806                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3807                 asoc->str_reset_seq_in++;
3808         } else if (asoc->str_reset_seq_in - 1 == seq) {
3809                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3810                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3811         } else if (asoc->str_reset_seq_in - 2 == seq) {
3812                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3813                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3814         } else {
3815                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3816         }
3817         return (0);
3818 }
3819
3820 static void
3821 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3822     struct sctp_tmit_chunk *chk,
3823     struct sctp_stream_reset_out_request *req, int trunc)
3824 {
3825         uint32_t seq, tsn;
3826         int number_entries, len;
3827         struct sctp_association *asoc = &stcb->asoc;
3828
3829         seq = ntohl(req->request_seq);
3830
3831         /* now if its not a duplicate we process it */
3832         if (asoc->str_reset_seq_in == seq) {
3833                 len = ntohs(req->ph.param_length);
3834                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3835                 /*
3836                  * the sender is resetting, handle the list issue.. we must
3837                  * a) verify if we can do the reset, if so no problem b) If
3838                  * we can't do the reset we must copy the request. c) queue
3839                  * it, and setup the data in processor to trigger it off
3840                  * when needed and dequeue all the queued data.
3841                  */
3842                 tsn = ntohl(req->send_reset_at_tsn);
3843
3844                 /* move the reset action back one */
3845                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3846                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3847                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3848                 } else if (trunc) {
3849                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3850                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3851                         /* we can do it now */
3852                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3853                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3854                 } else {
3855                         /*
3856                          * we must queue it up and thus wait for the TSN's
3857                          * to arrive that are at or before tsn
3858                          */
3859                         struct sctp_stream_reset_list *liste;
3860                         int siz;
3861
3862                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3863                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3864                             siz, SCTP_M_STRESET);
3865                         if (liste == NULL) {
3866                                 /* gak out of memory */
3867                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3868                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3869                                 return;
3870                         }
3871                         liste->tsn = tsn;
3872                         liste->number_entries = number_entries;
3873                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3874                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3875                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3876                 }
3877                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3878                 asoc->str_reset_seq_in++;
3879         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3880                 /*
3881                  * one seq back, just echo back last action since my
3882                  * response was lost.
3883                  */
3884                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3885         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3886                 /*
3887                  * two seq back, just echo back last action since my
3888                  * response was lost.
3889                  */
3890                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3891         } else {
3892                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3893         }
3894 }
3895
3896 static void
3897 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3898     struct sctp_stream_reset_add_strm *str_add)
3899 {
3900         /*
3901          * Peer is requesting to add more streams. If its within our
3902          * max-streams we will allow it.
3903          */
3904         uint32_t num_stream, i;
3905         uint32_t seq;
3906         struct sctp_association *asoc = &stcb->asoc;
3907         struct sctp_queued_to_read *ctl, *nctl;
3908
3909         /* Get the number. */
3910         seq = ntohl(str_add->request_seq);
3911         num_stream = ntohs(str_add->number_of_streams);
3912         /* Now what would be the new total? */
3913         if (asoc->str_reset_seq_in == seq) {
3914                 num_stream += stcb->asoc.streamincnt;
3915                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3916                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3917                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3918                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3919                     (num_stream > 0xffff)) {
3920                         /* We must reject it they ask for to many */
3921         denied:
3922                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3923                 } else {
3924                         /* Ok, we can do that :-) */
3925                         struct sctp_stream_in *oldstrm;
3926
3927                         /* save off the old */
3928                         oldstrm = stcb->asoc.strmin;
3929                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3930                             (num_stream * sizeof(struct sctp_stream_in)),
3931                             SCTP_M_STRMI);
3932                         if (stcb->asoc.strmin == NULL) {
3933                                 stcb->asoc.strmin = oldstrm;
3934                                 goto denied;
3935                         }
3936                         /* copy off the old data */
3937                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3938                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3939                                 stcb->asoc.strmin[i].stream_no = i;
3940                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3941                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3942                                 /* now anything on those queues? */
3943                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3944                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3945                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3946                                 }
3947                         }
3948                         /* Init the new streams */
3949                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3950                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3951                                 stcb->asoc.strmin[i].stream_no = i;
3952                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3953                                 stcb->asoc.strmin[i].delivery_started = 0;
3954                         }
3955                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3956                         /* update the size */
3957                         stcb->asoc.streamincnt = num_stream;
3958                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3959                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3960                 }
3961                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3962                 asoc->str_reset_seq_in++;
3963         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3964                 /*
3965                  * one seq back, just echo back last action since my
3966                  * response was lost.
3967                  */
3968                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3969         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3970                 /*
3971                  * two seq back, just echo back last action since my
3972                  * response was lost.
3973                  */
3974                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3975         } else {
3976                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3977
3978         }
3979 }
3980
3981 static void
3982 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3983     struct sctp_stream_reset_add_strm *str_add)
3984 {
3985         /*
3986          * Peer is requesting to add more streams. If its within our
3987          * max-streams we will allow it.
3988          */
3989         uint16_t num_stream;
3990         uint32_t seq;
3991         struct sctp_association *asoc = &stcb->asoc;
3992
3993         /* Get the number. */
3994         seq = ntohl(str_add->request_seq);
3995         num_stream = ntohs(str_add->number_of_streams);
3996         /* Now what would be the new total? */
3997         if (asoc->str_reset_seq_in == seq) {
3998                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3999                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4000                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4001                 } else if (stcb->asoc.stream_reset_outstanding) {
4002                         /* We must reject it we have something pending */
4003                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4004                 } else {
4005                         /* Ok, we can do that :-) */
4006                         int mychk;
4007
4008                         mychk = stcb->asoc.streamoutcnt;
4009                         mychk += num_stream;
4010                         if (mychk < 0x10000) {
4011                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4012                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4013                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4014                                 }
4015                         } else {
4016                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4017                         }
4018                 }
4019                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4020                 asoc->str_reset_seq_in++;
4021         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4022                 /*
4023                  * one seq back, just echo back last action since my
4024                  * response was lost.
4025                  */
4026                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4027         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4028                 /*
4029                  * two seq back, just echo back last action since my
4030                  * response was lost.
4031                  */
4032                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4033         } else {
4034                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4035         }
4036 }
4037
4038 #ifdef __GNUC__
4039 __attribute__((noinline))
4040 #endif
4041         static int
4042             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4043         struct sctp_chunkhdr *ch_req)
4044 {
4045         uint16_t remaining_length, param_len, ptype;
4046         struct sctp_paramhdr pstore;
4047         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4048         uint32_t seq = 0;
4049         int num_req = 0;
4050         int trunc = 0;
4051         struct sctp_tmit_chunk *chk;
4052         struct sctp_chunkhdr *ch;
4053         struct sctp_paramhdr *ph;
4054         int ret_code = 0;
4055         int num_param = 0;
4056
4057         /* now it may be a reset or a reset-response */
4058         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4059
4060         /* setup for adding the response */
4061         sctp_alloc_a_chunk(stcb, chk);
4062         if (chk == NULL) {
4063                 return (ret_code);
4064         }
4065         chk->copy_by_ref = 0;
4066         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4067         chk->rec.chunk_id.can_take_data = 0;
4068         chk->flags = 0;
4069         chk->asoc = &stcb->asoc;
4070         chk->no_fr_allowed = 0;
4071         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4072         chk->book_size_scale = 0;
4073         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4074         if (chk->data == NULL) {
4075 strres_nochunk:
4076                 if (chk->data) {
4077                         sctp_m_freem(chk->data);
4078                         chk->data = NULL;
4079                 }
4080                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4081                 return (ret_code);
4082         }
4083         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4084
4085         /* setup chunk parameters */
4086         chk->sent = SCTP_DATAGRAM_UNSENT;
4087         chk->snd_count = 0;
4088         chk->whoTo = NULL;
4089
4090         ch = mtod(chk->data, struct sctp_chunkhdr *);
4091         ch->chunk_type = SCTP_STREAM_RESET;
4092         ch->chunk_flags = 0;
4093         ch->chunk_length = htons(chk->send_size);
4094         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4095         offset += sizeof(struct sctp_chunkhdr);
4096         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4097                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4098                 if (ph == NULL) {
4099                         /* TSNH */
4100                         break;
4101                 }
4102                 param_len = ntohs(ph->param_length);
4103                 if ((param_len > remaining_length) ||
4104                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4105                         /* bad parameter length */
4106                         break;
4107                 }
4108                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4109                     (uint8_t *) & cstore);
4110                 if (ph == NULL) {
4111                         /* TSNH */
4112                         break;
4113                 }
4114                 ptype = ntohs(ph->param_type);
4115                 num_param++;
4116                 if (param_len > sizeof(cstore)) {
4117                         trunc = 1;
4118                 } else {
4119                         trunc = 0;
4120                 }
4121                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4122                         /* hit the max of parameters already sorry.. */
4123                         break;
4124                 }
4125                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4126                         struct sctp_stream_reset_out_request *req_out;
4127
4128                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4129                                 break;
4130                         }
4131                         req_out = (struct sctp_stream_reset_out_request *)ph;
4132                         num_req++;
4133                         if (stcb->asoc.stream_reset_outstanding) {
4134                                 seq = ntohl(req_out->response_seq);
4135                                 if (seq == stcb->asoc.str_reset_seq_out) {
4136                                         /* implicit ack */
4137                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4138                                 }
4139                         }
4140                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4141                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4142                         struct sctp_stream_reset_add_strm *str_add;
4143
4144                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4145                                 break;
4146                         }
4147                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4148                         num_req++;
4149                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4150                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4151                         struct sctp_stream_reset_add_strm *str_add;
4152
4153                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4154                                 break;
4155                         }
4156                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4157                         num_req++;
4158                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4159                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4160                         struct sctp_stream_reset_in_request *req_in;
4161
4162                         num_req++;
4163                         req_in = (struct sctp_stream_reset_in_request *)ph;
4164                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4165                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4166                         struct sctp_stream_reset_tsn_request *req_tsn;
4167
4168                         num_req++;
4169                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4170                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4171                                 ret_code = 1;
4172                                 goto strres_nochunk;
4173                         }
4174                         /* no more */
4175                         break;
4176                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4177                         struct sctp_stream_reset_response *resp;
4178                         uint32_t result;
4179
4180                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4181                                 break;
4182                         }
4183                         resp = (struct sctp_stream_reset_response *)ph;
4184                         seq = ntohl(resp->response_seq);
4185                         result = ntohl(resp->result);
4186                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4187                                 ret_code = 1;
4188                                 goto strres_nochunk;
4189                         }
4190                 } else {
4191                         break;
4192                 }
4193                 offset += SCTP_SIZE32(param_len);
4194                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4195                         remaining_length -= SCTP_SIZE32(param_len);
4196                 } else {
4197                         remaining_length = 0;
4198                 }
4199         }
4200         if (num_req == 0) {
4201                 /* we have no response free the stuff */
4202                 goto strres_nochunk;
4203         }
4204         /* ok we have a chunk to link in */
4205         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4206             chk,
4207             sctp_next);
4208         stcb->asoc.ctrl_queue_cnt++;
4209         return (ret_code);
4210 }
4211
4212 /*
4213  * Handle a router or endpoints report of a packet loss, there are two ways
4214  * to handle this, either we get the whole packet and must disect it
4215  * ourselves (possibly with truncation and or corruption) or it is a summary
4216  * from a middle box that did the disectting for us.
4217  */
4218 static void
4219 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4220     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4221 {
4222         uint32_t bottle_bw, on_queue;
4223         uint16_t trunc_len;
4224         unsigned int chlen;
4225         unsigned int at;
4226         struct sctp_chunk_desc desc;
4227         struct sctp_chunkhdr *ch;
4228
4229         chlen = ntohs(cp->ch.chunk_length);
4230         chlen -= sizeof(struct sctp_pktdrop_chunk);
4231         /* XXX possible chlen underflow */
4232         if (chlen == 0) {
4233                 ch = NULL;
4234                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4235                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4236         } else {
4237                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4238                 chlen -= sizeof(struct sctphdr);
4239                 /* XXX possible chlen underflow */
4240                 memset(&desc, 0, sizeof(desc));
4241         }
4242         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4243         if (trunc_len > limit) {
4244                 trunc_len = limit;
4245         }
4246         /* now the chunks themselves */
4247         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4248                 desc.chunk_type = ch->chunk_type;
4249                 /* get amount we need to move */
4250                 at = ntohs(ch->chunk_length);
4251                 if (at < sizeof(struct sctp_chunkhdr)) {
4252                         /* corrupt chunk, maybe at the end? */
4253                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4254                         break;
4255                 }
4256                 if (trunc_len == 0) {
4257                         /* we are supposed to have all of it */
4258                         if (at > chlen) {
4259                                 /* corrupt skip it */
4260                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4261                                 break;
4262                         }
4263                 } else {
4264                         /* is there enough of it left ? */
4265                         if (desc.chunk_type == SCTP_DATA) {
4266                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4267                                     sizeof(desc.data_bytes))) {
4268                                         break;
4269                                 }
4270                         } else {
4271                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4272                                         break;
4273                                 }
4274                         }
4275                 }
4276                 if (desc.chunk_type == SCTP_DATA) {
4277                         /* can we get out the tsn? */
4278                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4279                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4280
4281                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4282                                 /* yep */
4283                                 struct sctp_data_chunk *dcp;
4284                                 uint8_t *ddp;
4285                                 unsigned int iii;
4286
4287                                 dcp = (struct sctp_data_chunk *)ch;
4288                                 ddp = (uint8_t *) (dcp + 1);
4289                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4290                                         desc.data_bytes[iii] = ddp[iii];
4291                                 }
4292                                 desc.tsn_ifany = dcp->dp.tsn;
4293                         } else {
4294                                 /* nope we are done. */
4295                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4296                                 break;
4297                         }
4298                 } else {
4299                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4300                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4301                 }
4302
4303                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4304                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4305                         break;
4306                 }
4307                 if (SCTP_SIZE32(at) > chlen) {
4308                         break;
4309                 }
4310                 chlen -= SCTP_SIZE32(at);
4311                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4312                         /* done, none left */
4313                         break;
4314                 }
4315                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4316         }
4317         /* Now update any rwnd --- possibly */
4318         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4319                 /* From a peer, we get a rwnd report */
4320                 uint32_t a_rwnd;
4321
4322                 SCTP_STAT_INCR(sctps_pdrpfehos);
4323
4324                 bottle_bw = ntohl(cp->bottle_bw);
4325                 on_queue = ntohl(cp->current_onq);
4326                 if (bottle_bw && on_queue) {
4327                         /* a rwnd report is in here */
4328                         if (bottle_bw > on_queue)
4329                                 a_rwnd = bottle_bw - on_queue;
4330                         else
4331                                 a_rwnd = 0;
4332
4333                         if (a_rwnd == 0)
4334                                 stcb->asoc.peers_rwnd = 0;
4335                         else {
4336                                 if (a_rwnd > stcb->asoc.total_flight) {
4337                                         stcb->asoc.peers_rwnd =
4338                                             a_rwnd - stcb->asoc.total_flight;
4339                                 } else {
4340                                         stcb->asoc.peers_rwnd = 0;
4341                                 }
4342                                 if (stcb->asoc.peers_rwnd <
4343                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4344                                         /* SWS sender side engages */
4345                                         stcb->asoc.peers_rwnd = 0;
4346                                 }
4347                         }
4348                 }
4349         } else {
4350                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4351         }
4352
4353         /* now middle boxes in sat networks get a cwnd bump */
4354         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4355             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4356             (stcb->asoc.sat_network)) {
4357                 /*
4358                  * This is debateable but for sat networks it makes sense
4359                  * Note if a T3 timer has went off, we will prohibit any
4360                  * changes to cwnd until we exit the t3 loss recovery.
4361                  */
4362                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4363                     net, cp, &bottle_bw, &on_queue);
4364         }
4365 }
4366
4367 /*
4368  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4369  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4370  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4371  * length of the complete packet outputs: - length: modified to remaining
4372  * length after control processing - netp: modified to new sctp_nets after
4373  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4374  * bad packet,...) otherwise return the tcb for this packet
4375  */
4376 #ifdef __GNUC__
4377 __attribute__((noinline))
4378 #endif
4379         static struct sctp_tcb *
4380                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4381              struct sockaddr *src, struct sockaddr *dst,
4382              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4383              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4384              uint8_t mflowtype, uint32_t mflowid,
4385              uint32_t vrf_id, uint16_t port)
4386 {
4387         struct sctp_association *asoc;
4388         struct mbuf *op_err;
4389         char msg[SCTP_DIAG_INFO_LEN];
4390         uint32_t vtag_in;
4391         int num_chunks = 0;     /* number of control chunks processed */
4392         uint32_t chk_length;
4393         int ret;
4394         int abort_no_unlock = 0;
4395         int ecne_seen = 0;
4396
4397         /*
4398          * How big should this be, and should it be alloc'd? Lets try the
4399          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4400          * until we get into jumbo grams and such..
4401          */
4402         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4403         struct sctp_tcb *locked_tcb = stcb;
4404         int got_auth = 0;
4405         uint32_t auth_offset = 0, auth_len = 0;
4406         int auth_skipped = 0;
4407         int asconf_cnt = 0;
4408
4409 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4410         struct socket *so;
4411
4412 #endif
4413
4414         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4415             iphlen, *offset, length, (void *)stcb);
4416
4417         /* validate chunk header length... */
4418         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4419                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4420                     ntohs(ch->chunk_length));
4421                 if (locked_tcb) {
4422                         SCTP_TCB_UNLOCK(locked_tcb);
4423                 }
4424                 return (NULL);
4425         }
4426         /*
4427          * validate the verification tag
4428          */
4429         vtag_in = ntohl(sh->v_tag);
4430
4431         if (locked_tcb) {
4432                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4433         }
4434         if (ch->chunk_type == SCTP_INITIATION) {
4435                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4436                     ntohs(ch->chunk_length), vtag_in);
4437                 if (vtag_in != 0) {
4438                         /* protocol error- silently discard... */
4439                         SCTP_STAT_INCR(sctps_badvtag);
4440                         if (locked_tcb) {
4441                                 SCTP_TCB_UNLOCK(locked_tcb);
4442                         }
4443                         return (NULL);
4444                 }
4445         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4446                 /*
4447                  * If there is no stcb, skip the AUTH chunk and process
4448                  * later after a stcb is found (to validate the lookup was
4449                  * valid.
4450                  */
4451                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4452                     (stcb == NULL) &&
4453                     (inp->auth_supported == 1)) {
4454                         /* save this chunk for later processing */
4455                         auth_skipped = 1;
4456                         auth_offset = *offset;
4457                         auth_len = ntohs(ch->chunk_length);
4458
4459                         /* (temporarily) move past this chunk */
4460                         *offset += SCTP_SIZE32(auth_len);
4461                         if (*offset >= length) {
4462                                 /* no more data left in the mbuf chain */
4463                                 *offset = length;
4464                                 if (locked_tcb) {
4465                                         SCTP_TCB_UNLOCK(locked_tcb);
4466                                 }
4467                                 return (NULL);
4468                         }
4469                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4470                             sizeof(struct sctp_chunkhdr), chunk_buf);
4471                 }
4472                 if (ch == NULL) {
4473                         /* Help */
4474                         *offset = length;
4475                         if (locked_tcb) {
4476                                 SCTP_TCB_UNLOCK(locked_tcb);
4477                         }
4478                         return (NULL);
4479                 }
4480                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4481                         goto process_control_chunks;
4482                 }
4483                 /*
4484                  * first check if it's an ASCONF with an unknown src addr we
4485                  * need to look inside to find the association
4486                  */
4487                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4488                         struct sctp_chunkhdr *asconf_ch = ch;
4489                         uint32_t asconf_offset = 0, asconf_len = 0;
4490
4491                         /* inp's refcount may be reduced */
4492                         SCTP_INP_INCR_REF(inp);
4493
4494                         asconf_offset = *offset;
4495                         do {
4496                                 asconf_len = ntohs(asconf_ch->chunk_length);
4497                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4498                                         break;
4499                                 stcb = sctp_findassociation_ep_asconf(m,
4500                                     *offset,
4501                                     dst,
4502                                     sh, &inp, netp, vrf_id);
4503                                 if (stcb != NULL)
4504                                         break;
4505                                 asconf_offset += SCTP_SIZE32(asconf_len);
4506                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4507                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4508                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4509                         if (stcb == NULL) {
4510                                 /*
4511                                  * reduce inp's refcount if not reduced in
4512                                  * sctp_findassociation_ep_asconf().
4513                                  */
4514                                 SCTP_INP_DECR_REF(inp);
4515                         } else {
4516                                 locked_tcb = stcb;
4517                         }
4518
4519                         /* now go back and verify any auth chunk to be sure */
4520                         if (auth_skipped && (stcb != NULL)) {
4521                                 struct sctp_auth_chunk *auth;
4522
4523                                 auth = (struct sctp_auth_chunk *)
4524                                     sctp_m_getptr(m, auth_offset,
4525                                     auth_len, chunk_buf);
4526                                 got_auth = 1;
4527                                 auth_skipped = 0;
4528                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4529                                     auth_offset)) {
4530                                         /* auth HMAC failed so dump it */
4531                                         *offset = length;
4532                                         if (locked_tcb) {
4533                                                 SCTP_TCB_UNLOCK(locked_tcb);
4534                                         }
4535                                         return (NULL);
4536                                 } else {
4537                                         /* remaining chunks are HMAC checked */
4538                                         stcb->asoc.authenticated = 1;
4539                                 }
4540                         }
4541                 }
4542                 if (stcb == NULL) {
4543                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4544                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4545                             msg);
4546                         /* no association, so it's out of the blue... */
4547                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4548                             mflowtype, mflowid,
4549                             vrf_id, port);
4550                         *offset = length;
4551                         if (locked_tcb) {
4552                                 SCTP_TCB_UNLOCK(locked_tcb);
4553                         }
4554                         return (NULL);
4555                 }
4556                 asoc = &stcb->asoc;
4557                 /* ABORT and SHUTDOWN can use either v_tag... */
4558                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4559                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4560                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4561                         /* Take the T-bit always into account. */
4562                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4563                             (vtag_in == asoc->my_vtag)) ||
4564                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4565                             (vtag_in == asoc->peer_vtag))) {
4566                                 /* this is valid */
4567                         } else {
4568                                 /* drop this packet... */
4569                                 SCTP_STAT_INCR(sctps_badvtag);
4570                                 if (locked_tcb) {
4571                                         SCTP_TCB_UNLOCK(locked_tcb);
4572                                 }
4573                                 return (NULL);
4574                         }
4575                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4576                         if (vtag_in != asoc->my_vtag) {
4577                                 /*
4578                                  * this could be a stale SHUTDOWN-ACK or the
4579                                  * peer never got the SHUTDOWN-COMPLETE and
4580                                  * is still hung; we have started a new asoc
4581                                  * but it won't complete until the shutdown
4582                                  * is completed
4583                                  */
4584                                 if (locked_tcb) {
4585                                         SCTP_TCB_UNLOCK(locked_tcb);
4586                                 }
4587                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4588                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4589                                     msg);
4590                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4591                                     sh, inp, op_err,
4592                                     mflowtype, mflowid,
4593                                     vrf_id, port);
4594                                 return (NULL);
4595                         }
4596                 } else {
4597                         /* for all other chunks, vtag must match */
4598                         if (vtag_in != asoc->my_vtag) {
4599                                 /* invalid vtag... */
4600                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4601                                     "invalid vtag: %xh, expect %xh\n",
4602                                     vtag_in, asoc->my_vtag);
4603                                 SCTP_STAT_INCR(sctps_badvtag);
4604                                 if (locked_tcb) {
4605                                         SCTP_TCB_UNLOCK(locked_tcb);
4606                                 }
4607                                 *offset = length;
4608                                 return (NULL);
4609                         }
4610                 }
4611         }                       /* end if !SCTP_COOKIE_ECHO */
4612         /*
4613          * process all control chunks...
4614          */
4615         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4616             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4617             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4618             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4619                 /* implied cookie-ack.. we must have lost the ack */
4620                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4621                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4622                             stcb->asoc.overall_error_count,
4623                             0,
4624                             SCTP_FROM_SCTP_INPUT,
4625                             __LINE__);
4626                 }
4627                 stcb->asoc.overall_error_count = 0;
4628                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4629                     *netp);
4630         }
4631 process_control_chunks:
4632         while (IS_SCTP_CONTROL(ch)) {
4633                 /* validate chunk length */
4634                 chk_length = ntohs(ch->chunk_length);
4635                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4636                     ch->chunk_type, chk_length);
4637                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4638                 if (chk_length < sizeof(*ch) ||
4639                     (*offset + (int)chk_length) > length) {
4640                         *offset = length;
4641                         if (locked_tcb) {
4642                                 SCTP_TCB_UNLOCK(locked_tcb);
4643                         }
4644                         return (NULL);
4645                 }
4646                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4647                 /*
4648                  * INIT-ACK only gets the init ack "header" portion only
4649                  * because we don't have to process the peer's COOKIE. All
4650                  * others get a complete chunk.
4651                  */
4652                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4653                     (ch->chunk_type == SCTP_INITIATION)) {
4654                         /* get an init-ack chunk */
4655                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4656                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4657                         if (ch == NULL) {
4658                                 *offset = length;
4659                                 if (locked_tcb) {
4660                                         SCTP_TCB_UNLOCK(locked_tcb);
4661                                 }
4662                                 return (NULL);
4663                         }
4664                 } else {
4665                         /* For cookies and all other chunks. */
4666                         if (chk_length > sizeof(chunk_buf)) {
4667                                 /*
4668                                  * use just the size of the chunk buffer so
4669                                  * the front part of our chunks fit in
4670                                  * contiguous space up to the chunk buffer
4671                                  * size (508 bytes). For chunks that need to
4672                                  * get more than that they must use the
4673                                  * sctp_m_getptr() function or other means
4674                                  * (e.g. know how to parse mbuf chains).
4675                                  * Cookies do this already.
4676                                  */
4677                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4678                                     (sizeof(chunk_buf) - 4),
4679                                     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                                 /* We can fit it all */
4689                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4690                                     chk_length, chunk_buf);
4691                                 if (ch == NULL) {
4692                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4693                                         *offset = length;
4694                                         if (locked_tcb) {
4695                                                 SCTP_TCB_UNLOCK(locked_tcb);
4696                                         }
4697                                         return (NULL);
4698                                 }
4699                         }
4700                 }
4701                 num_chunks++;
4702                 /* Save off the last place we got a control from */
4703                 if (stcb != NULL) {
4704                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4705                                 /*
4706                                  * allow last_control to be NULL if
4707                                  * ASCONF... ASCONF processing will find the
4708                                  * right net later
4709                                  */
4710                                 if ((netp != NULL) && (*netp != NULL))
4711                                         stcb->asoc.last_control_chunk_from = *netp;
4712                         }
4713                 }
4714 #ifdef SCTP_AUDITING_ENABLED
4715                 sctp_audit_log(0xB0, ch->chunk_type);
4716 #endif
4717
4718                 /* check to see if this chunk required auth, but isn't */
4719                 if ((stcb != NULL) &&
4720                     (stcb->asoc.auth_supported == 1) &&
4721                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4722                     !stcb->asoc.authenticated) {
4723                         /* "silently" ignore */
4724                         SCTP_STAT_INCR(sctps_recvauthmissing);
4725                         goto next_chunk;
4726                 }
4727                 switch (ch->chunk_type) {
4728                 case SCTP_INITIATION:
4729                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4730                         /* The INIT chunk must be the only chunk. */
4731                         if ((num_chunks > 1) ||
4732                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4733                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4734                                     "INIT not the only chunk");
4735                                 sctp_abort_association(inp, stcb, m, iphlen,
4736                                     src, dst, sh, op_err,
4737                                     mflowtype, mflowid,
4738                                     vrf_id, port);
4739                                 *offset = length;
4740                                 return (NULL);
4741                         }
4742                         /* Honor our resource limit. */
4743                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4744                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4745                                 sctp_abort_association(inp, stcb, m, iphlen,
4746                                     src, dst, sh, op_err,
4747                                     mflowtype, mflowid,
4748                                     vrf_id, port);
4749                                 *offset = length;
4750                                 return (NULL);
4751                         }
4752                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4753                             (struct sctp_init_chunk *)ch, inp,
4754                             stcb, &abort_no_unlock,
4755                             mflowtype, mflowid,
4756                             vrf_id, port);
4757                         *offset = length;
4758                         if ((!abort_no_unlock) && (locked_tcb)) {
4759                                 SCTP_TCB_UNLOCK(locked_tcb);
4760                         }
4761                         return (NULL);
4762                         break;
4763                 case SCTP_PAD_CHUNK:
4764                         break;
4765                 case SCTP_INITIATION_ACK:
4766                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4767                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4768                                 /* We are not interested anymore */
4769                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4770                                         ;
4771                                 } else {
4772                                         if (locked_tcb != stcb) {
4773                                                 /* Very unlikely */
4774                                                 SCTP_TCB_UNLOCK(locked_tcb);
4775                                         }
4776                                         *offset = length;
4777                                         if (stcb) {
4778 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4779                                                 so = SCTP_INP_SO(inp);
4780                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4781                                                 SCTP_TCB_UNLOCK(stcb);
4782                                                 SCTP_SOCKET_LOCK(so, 1);
4783                                                 SCTP_TCB_LOCK(stcb);
4784                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4785 #endif
4786                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4787 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4788                                                 SCTP_SOCKET_UNLOCK(so, 1);
4789 #endif
4790                                         }
4791                                         return (NULL);
4792                                 }
4793                         }
4794                         /* The INIT-ACK chunk must be the only chunk. */
4795                         if ((num_chunks > 1) ||
4796                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4797                                 *offset = length;
4798                                 if (locked_tcb) {
4799                                         SCTP_TCB_UNLOCK(locked_tcb);
4800                                 }
4801                                 return (NULL);
4802                         }
4803                         if ((netp) && (*netp)) {
4804                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4805                                     src, dst, sh,
4806                                     (struct sctp_init_ack_chunk *)ch,
4807                                     stcb, *netp,
4808                                     &abort_no_unlock,
4809                                     mflowtype, mflowid,
4810                                     vrf_id);
4811                         } else {
4812                                 ret = -1;
4813                         }
4814                         *offset = length;
4815                         if (abort_no_unlock) {
4816                                 return (NULL);
4817                         }
4818                         /*
4819                          * Special case, I must call the output routine to
4820                          * get the cookie echoed
4821                          */
4822                         if ((stcb != NULL) && (ret == 0)) {
4823                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4824                         }
4825                         if (locked_tcb) {
4826                                 SCTP_TCB_UNLOCK(locked_tcb);
4827                         }
4828                         return (NULL);
4829                         break;
4830                 case SCTP_SELECTIVE_ACK:
4831                         {
4832                                 struct sctp_sack_chunk *sack;
4833                                 int abort_now = 0;
4834                                 uint32_t a_rwnd, cum_ack;
4835                                 uint16_t num_seg, num_dup;
4836                                 uint8_t flags;
4837                                 int offset_seg, offset_dup;
4838
4839                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4840                                 SCTP_STAT_INCR(sctps_recvsacks);
4841                                 if (stcb == NULL) {
4842                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4843                                         break;
4844                                 }
4845                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4846                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4847                                         break;
4848                                 }
4849                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4850                                         /*-
4851                                          * If we have sent a shutdown-ack, we will pay no
4852                                          * attention to a sack sent in to us since
4853                                          * we don't care anymore.
4854                                          */
4855                                         break;
4856                                 }
4857                                 sack = (struct sctp_sack_chunk *)ch;
4858                                 flags = ch->chunk_flags;
4859                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4860                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4861                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4862                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4863                                 if (sizeof(struct sctp_sack_chunk) +
4864                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4865                                     num_dup * sizeof(uint32_t) != chk_length) {
4866                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4867                                         break;
4868                                 }
4869                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4870                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4871                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4872                                     cum_ack, num_seg, a_rwnd);
4873                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4874                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4875                                     (num_seg == 0) &&
4876                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4877                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4878                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4879                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4880                                     ) {
4881                                         /*
4882                                          * We have a SIMPLE sack having no
4883                                          * prior segments and data on sent
4884                                          * queue to be acked.. Use the
4885                                          * faster path sack processing. We
4886                                          * also allow window update sacks
4887                                          * with no missing segments to go
4888                                          * this way too.
4889                                          */
4890                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4891                                 } else {
4892                                         if (netp && *netp)
4893                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4894                                                     num_seg, 0, num_dup, &abort_now, flags,
4895                                                     cum_ack, a_rwnd, ecne_seen);
4896                                 }
4897                                 if (abort_now) {
4898                                         /* ABORT signal from sack processing */
4899                                         *offset = length;
4900                                         return (NULL);
4901                                 }
4902                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4903                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4904                                     (stcb->asoc.stream_queue_cnt == 0)) {
4905                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4906                                 }
4907                         }
4908                         break;
4909                         /*
4910                          * EY - nr_sack:  If the received chunk is an
4911                          * nr_sack chunk
4912                          */
4913                 case SCTP_NR_SELECTIVE_ACK:
4914                         {
4915                                 struct sctp_nr_sack_chunk *nr_sack;
4916                                 int abort_now = 0;
4917                                 uint32_t a_rwnd, cum_ack;
4918                                 uint16_t num_seg, num_nr_seg, num_dup;
4919                                 uint8_t flags;
4920                                 int offset_seg, offset_dup;
4921
4922                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4923                                 SCTP_STAT_INCR(sctps_recvsacks);
4924                                 if (stcb == NULL) {
4925                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4926                                         break;
4927                                 }
4928                                 if (stcb->asoc.nrsack_supported == 0) {
4929                                         goto unknown_chunk;
4930                                 }
4931                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4932                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4933                                         break;
4934                                 }
4935                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4936                                         /*-
4937                                          * If we have sent a shutdown-ack, we will pay no
4938                                          * attention to a sack sent in to us since
4939                                          * we don't care anymore.
4940                                          */
4941                                         break;
4942                                 }
4943                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4944                                 flags = ch->chunk_flags;
4945                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4946                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4947                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4948                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4949                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4950                                 if (sizeof(struct sctp_nr_sack_chunk) +
4951                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4952                                     num_dup * sizeof(uint32_t) != chk_length) {
4953                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4954                                         break;
4955                                 }
4956                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4957                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4958                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4959                                     cum_ack, num_seg, a_rwnd);
4960                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4961                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4962                                     (num_seg == 0) && (num_nr_seg == 0) &&
4963                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4964                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4965                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4966                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4967                                         /*
4968                                          * We have a SIMPLE sack having no
4969                                          * prior segments and data on sent
4970                                          * queue to be acked. Use the faster
4971                                          * path sack processing. We also
4972                                          * allow window update sacks with no
4973                                          * missing segments to go this way
4974                                          * too.
4975                                          */
4976                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4977                                             &abort_now, ecne_seen);
4978                                 } else {
4979                                         if (netp && *netp)
4980                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4981                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4982                                                     cum_ack, a_rwnd, ecne_seen);
4983                                 }
4984                                 if (abort_now) {
4985                                         /* ABORT signal from sack processing */
4986                                         *offset = length;
4987                                         return (NULL);
4988                                 }
4989                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4990                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4991                                     (stcb->asoc.stream_queue_cnt == 0)) {
4992                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4993                                 }
4994                         }
4995                         break;
4996
4997                 case SCTP_HEARTBEAT_REQUEST:
4998                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4999                         if ((stcb) && netp && *netp) {
5000                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5001                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5002                                     chk_length, *netp);
5003
5004                                 /* He's alive so give him credit */
5005                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5006                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5007                                             stcb->asoc.overall_error_count,
5008                                             0,
5009                                             SCTP_FROM_SCTP_INPUT,
5010                                             __LINE__);
5011                                 }
5012                                 stcb->asoc.overall_error_count = 0;
5013                         }
5014                         break;
5015                 case SCTP_HEARTBEAT_ACK:
5016                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5017                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5018                                 /* Its not ours */
5019                                 *offset = length;
5020                                 if (locked_tcb) {
5021                                         SCTP_TCB_UNLOCK(locked_tcb);
5022                                 }
5023                                 return (NULL);
5024                         }
5025                         /* He's alive so give him credit */
5026                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5027                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5028                                     stcb->asoc.overall_error_count,
5029                                     0,
5030                                     SCTP_FROM_SCTP_INPUT,
5031                                     __LINE__);
5032                         }
5033                         stcb->asoc.overall_error_count = 0;
5034                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5035                         if (netp && *netp)
5036                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5037                                     stcb, *netp);
5038                         break;
5039                 case SCTP_ABORT_ASSOCIATION:
5040                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5041                             (void *)stcb);
5042                         if ((stcb) && netp && *netp)
5043                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5044                                     stcb, *netp);
5045                         *offset = length;
5046                         return (NULL);
5047                         break;
5048                 case SCTP_SHUTDOWN:
5049                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5050                             (void *)stcb);
5051                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5052                                 *offset = length;
5053                                 if (locked_tcb) {
5054                                         SCTP_TCB_UNLOCK(locked_tcb);
5055                                 }
5056                                 return (NULL);
5057                         }
5058                         if (netp && *netp) {
5059                                 int abort_flag = 0;
5060
5061                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5062                                     stcb, *netp, &abort_flag);
5063                                 if (abort_flag) {
5064                                         *offset = length;
5065                                         return (NULL);
5066                                 }
5067                         }
5068                         break;
5069                 case SCTP_SHUTDOWN_ACK:
5070                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5071                         if ((stcb) && (netp) && (*netp))
5072                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5073                         *offset = length;
5074                         return (NULL);
5075                         break;
5076
5077                 case SCTP_OPERATION_ERROR:
5078                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5079                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5080                                 *offset = length;
5081                                 return (NULL);
5082                         }
5083                         break;
5084                 case SCTP_COOKIE_ECHO:
5085                         SCTPDBG(SCTP_DEBUG_INPUT3,
5086                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5087                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5088                                 ;
5089                         } else {
5090                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5091                                         /* We are not interested anymore */
5092                         abend:
5093                                         if (stcb) {
5094                                                 SCTP_TCB_UNLOCK(stcb);
5095                                         }
5096                                         *offset = length;
5097                                         return (NULL);
5098                                 }
5099                         }
5100                         /*
5101                          * First are we accepting? We do this again here
5102                          * since it is possible that a previous endpoint WAS
5103                          * listening responded to a INIT-ACK and then
5104                          * closed. We opened and bound.. and are now no
5105                          * longer listening.
5106                          */
5107
5108                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5109                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5110                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5111                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5112                                         sctp_abort_association(inp, stcb, m, iphlen,
5113                                             src, dst, sh, op_err,
5114                                             mflowtype, mflowid,
5115                                             vrf_id, port);
5116                                 }
5117                                 *offset = length;
5118                                 return (NULL);
5119                         } else {
5120                                 struct mbuf *ret_buf;
5121                                 struct sctp_inpcb *linp;
5122
5123                                 if (stcb) {
5124                                         linp = NULL;
5125                                 } else {
5126                                         linp = inp;
5127                                 }
5128
5129                                 if (linp) {
5130                                         SCTP_ASOC_CREATE_LOCK(linp);
5131                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5132                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5133                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5134                                                 goto abend;
5135                                         }
5136                                 }
5137                                 if (netp) {
5138                                         ret_buf =
5139                                             sctp_handle_cookie_echo(m, iphlen,
5140                                             *offset,
5141                                             src, dst,
5142                                             sh,
5143                                             (struct sctp_cookie_echo_chunk *)ch,
5144                                             &inp, &stcb, netp,
5145                                             auth_skipped,
5146                                             auth_offset,
5147                                             auth_len,
5148                                             &locked_tcb,
5149                                             mflowtype,
5150                                             mflowid,
5151                                             vrf_id,
5152                                             port);
5153                                 } else {
5154                                         ret_buf = NULL;
5155                                 }
5156                                 if (linp) {
5157                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5158                                 }
5159                                 if (ret_buf == NULL) {
5160                                         if (locked_tcb) {
5161                                                 SCTP_TCB_UNLOCK(locked_tcb);
5162                                         }
5163                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5164                                             "GAK, null buffer\n");
5165                                         *offset = length;
5166                                         return (NULL);
5167                                 }
5168                                 /* if AUTH skipped, see if it verified... */
5169                                 if (auth_skipped) {
5170                                         got_auth = 1;
5171                                         auth_skipped = 0;
5172                                 }
5173                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5174                                         /*
5175                                          * Restart the timer if we have
5176                                          * pending data
5177                                          */
5178                                         struct sctp_tmit_chunk *chk;
5179
5180                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5181                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5182                                 }
5183                         }
5184                         break;
5185                 case SCTP_COOKIE_ACK:
5186                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5187                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5188                                 if (locked_tcb) {
5189                                         SCTP_TCB_UNLOCK(locked_tcb);
5190                                 }
5191                                 return (NULL);
5192                         }
5193                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5194                                 /* We are not interested anymore */
5195                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5196                                         ;
5197                                 } else if (stcb) {
5198 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5199                                         so = SCTP_INP_SO(inp);
5200                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5201                                         SCTP_TCB_UNLOCK(stcb);
5202                                         SCTP_SOCKET_LOCK(so, 1);
5203                                         SCTP_TCB_LOCK(stcb);
5204                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5205 #endif
5206                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5207 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5208                                         SCTP_SOCKET_UNLOCK(so, 1);
5209 #endif
5210                                         *offset = length;
5211                                         return (NULL);
5212                                 }
5213                         }
5214                         /* He's alive so give him credit */
5215                         if ((stcb) && netp && *netp) {
5216                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5217                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5218                                             stcb->asoc.overall_error_count,
5219                                             0,
5220                                             SCTP_FROM_SCTP_INPUT,
5221                                             __LINE__);
5222                                 }
5223                                 stcb->asoc.overall_error_count = 0;
5224                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5225                         }
5226                         break;
5227                 case SCTP_ECN_ECHO:
5228                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5229                         /* He's alive so give him credit */
5230                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5231                                 /* Its not ours */
5232                                 if (locked_tcb) {
5233                                         SCTP_TCB_UNLOCK(locked_tcb);
5234                                 }
5235                                 *offset = length;
5236                                 return (NULL);
5237                         }
5238                         if (stcb) {
5239                                 if (stcb->asoc.ecn_supported == 0) {
5240                                         goto unknown_chunk;
5241                                 }
5242                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5243                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5244                                             stcb->asoc.overall_error_count,
5245                                             0,
5246                                             SCTP_FROM_SCTP_INPUT,
5247                                             __LINE__);
5248                                 }
5249                                 stcb->asoc.overall_error_count = 0;
5250                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5251                                     stcb);
5252                                 ecne_seen = 1;
5253                         }
5254                         break;
5255                 case SCTP_ECN_CWR:
5256                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5257                         /* He's alive so give him credit */
5258                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5259                                 /* Its not ours */
5260                                 if (locked_tcb) {
5261                                         SCTP_TCB_UNLOCK(locked_tcb);
5262                                 }
5263                                 *offset = length;
5264                                 return (NULL);
5265                         }
5266                         if (stcb) {
5267                                 if (stcb->asoc.ecn_supported == 0) {
5268                                         goto unknown_chunk;
5269                                 }
5270                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5271                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5272                                             stcb->asoc.overall_error_count,
5273                                             0,
5274                                             SCTP_FROM_SCTP_INPUT,
5275                                             __LINE__);
5276                                 }
5277                                 stcb->asoc.overall_error_count = 0;
5278                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5279                         }
5280                         break;
5281                 case SCTP_SHUTDOWN_COMPLETE:
5282                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5283                         /* must be first and only chunk */
5284                         if ((num_chunks > 1) ||
5285                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5286                                 *offset = length;
5287                                 if (locked_tcb) {
5288                                         SCTP_TCB_UNLOCK(locked_tcb);
5289                                 }
5290                                 return (NULL);
5291                         }
5292                         if ((stcb) && netp && *netp) {
5293                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5294                                     stcb, *netp);
5295                         }
5296                         *offset = length;
5297                         return (NULL);
5298                         break;
5299                 case SCTP_ASCONF:
5300                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5301                         /* He's alive so give him credit */
5302                         if (stcb) {
5303                                 if (stcb->asoc.asconf_supported == 0) {
5304                                         goto unknown_chunk;
5305                                 }
5306                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5307                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5308                                             stcb->asoc.overall_error_count,
5309                                             0,
5310                                             SCTP_FROM_SCTP_INPUT,
5311                                             __LINE__);
5312                                 }
5313                                 stcb->asoc.overall_error_count = 0;
5314                                 sctp_handle_asconf(m, *offset, src,
5315                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5316                                 asconf_cnt++;
5317                         }
5318                         break;
5319                 case SCTP_ASCONF_ACK:
5320                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5321                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5322                                 /* Its not ours */
5323                                 if (locked_tcb) {
5324                                         SCTP_TCB_UNLOCK(locked_tcb);
5325                                 }
5326                                 *offset = length;
5327                                 return (NULL);
5328                         }
5329                         if ((stcb) && netp && *netp) {
5330                                 if (stcb->asoc.asconf_supported == 0) {
5331                                         goto unknown_chunk;
5332                                 }
5333                                 /* He's alive so give him credit */
5334                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5335                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5336                                             stcb->asoc.overall_error_count,
5337                                             0,
5338                                             SCTP_FROM_SCTP_INPUT,
5339                                             __LINE__);
5340                                 }
5341                                 stcb->asoc.overall_error_count = 0;
5342                                 sctp_handle_asconf_ack(m, *offset,
5343                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5344                                 if (abort_no_unlock)
5345                                         return (NULL);
5346                         }
5347                         break;
5348                 case SCTP_FORWARD_CUM_TSN:
5349                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5350                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5351                                 /* Its not ours */
5352                                 if (locked_tcb) {
5353                                         SCTP_TCB_UNLOCK(locked_tcb);
5354                                 }
5355                                 *offset = length;
5356                                 return (NULL);
5357                         }
5358                         /* He's alive so give him credit */
5359                         if (stcb) {
5360                                 int abort_flag = 0;
5361
5362                                 if (stcb->asoc.prsctp_supported == 0) {
5363                                         goto unknown_chunk;
5364                                 }
5365                                 stcb->asoc.overall_error_count = 0;
5366                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5367                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5368                                             stcb->asoc.overall_error_count,
5369                                             0,
5370                                             SCTP_FROM_SCTP_INPUT,
5371                                             __LINE__);
5372                                 }
5373                                 *fwd_tsn_seen = 1;
5374                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5375                                         /* We are not interested anymore */
5376 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5377                                         so = SCTP_INP_SO(inp);
5378                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5379                                         SCTP_TCB_UNLOCK(stcb);
5380                                         SCTP_SOCKET_LOCK(so, 1);
5381                                         SCTP_TCB_LOCK(stcb);
5382                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5383 #endif
5384                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5385 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5386                                         SCTP_SOCKET_UNLOCK(so, 1);
5387 #endif
5388                                         *offset = length;
5389                                         return (NULL);
5390                                 }
5391                                 sctp_handle_forward_tsn(stcb,
5392                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5393                                 if (abort_flag) {
5394                                         *offset = length;
5395                                         return (NULL);
5396                                 } else {
5397                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5398                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5399                                                     stcb->asoc.overall_error_count,
5400                                                     0,
5401                                                     SCTP_FROM_SCTP_INPUT,
5402                                                     __LINE__);
5403                                         }
5404                                         stcb->asoc.overall_error_count = 0;
5405                                 }
5406
5407                         }
5408                         break;
5409                 case SCTP_STREAM_RESET:
5410                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5411                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5412                                 /* Its not ours */
5413                                 if (locked_tcb) {
5414                                         SCTP_TCB_UNLOCK(locked_tcb);
5415                                 }
5416                                 *offset = length;
5417                                 return (NULL);
5418                         }
5419                         if (stcb->asoc.reconfig_supported == 0) {
5420                                 goto unknown_chunk;
5421                         }
5422                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5423                                 /* stop processing */
5424                                 *offset = length;
5425                                 return (NULL);
5426                         }
5427                         break;
5428                 case SCTP_PACKET_DROPPED:
5429                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5430                         /* re-get it all please */
5431                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5432                                 /* Its not ours */
5433                                 if (locked_tcb) {
5434                                         SCTP_TCB_UNLOCK(locked_tcb);
5435                                 }
5436                                 *offset = length;
5437                                 return (NULL);
5438                         }
5439                         if (ch && (stcb) && netp && (*netp)) {
5440                                 if (stcb->asoc.pktdrop_supported == 0) {
5441                                         goto unknown_chunk;
5442                                 }
5443                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5444                                     stcb, *netp,
5445                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5446
5447                         }
5448                         break;
5449                 case SCTP_AUTHENTICATION:
5450                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5451                         if (stcb == NULL) {
5452                                 /* save the first AUTH for later processing */
5453                                 if (auth_skipped == 0) {
5454                                         auth_offset = *offset;
5455                                         auth_len = chk_length;
5456                                         auth_skipped = 1;
5457                                 }
5458                                 /* skip this chunk (temporarily) */
5459                                 goto next_chunk;
5460                         }
5461                         if (stcb->asoc.auth_supported == 0) {
5462                                 goto unknown_chunk;
5463                         }
5464                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5465                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5466                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5467                                 /* Its not ours */
5468                                 if (locked_tcb) {
5469                                         SCTP_TCB_UNLOCK(locked_tcb);
5470                                 }
5471                                 *offset = length;
5472                                 return (NULL);
5473                         }
5474                         if (got_auth == 1) {
5475                                 /* skip this chunk... it's already auth'd */
5476                                 goto next_chunk;
5477                         }
5478                         got_auth = 1;
5479                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5480                             m, *offset)) {
5481                                 /* auth HMAC failed so dump the packet */
5482                                 *offset = length;
5483                                 return (stcb);
5484                         } else {
5485                                 /* remaining chunks are HMAC checked */
5486                                 stcb->asoc.authenticated = 1;
5487                         }
5488                         break;
5489
5490                 default:
5491         unknown_chunk:
5492                         /* it's an unknown chunk! */
5493                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5494                                 struct mbuf *mm;
5495                                 struct sctp_paramhdr *phd;
5496                                 int len;
5497
5498                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5499                                     0, M_NOWAIT, 1, MT_DATA);
5500                                 if (mm) {
5501                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5502                                         phd = mtod(mm, struct sctp_paramhdr *);
5503                                         /*
5504                                          * We cheat and use param type since
5505                                          * we did not bother to define a
5506                                          * error cause struct. They are the
5507                                          * same basic format with different
5508                                          * names.
5509                                          */
5510                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5511                                         phd->param_length = htons(len + sizeof(*phd));
5512                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5513                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5514                                         if (SCTP_BUF_NEXT(mm)) {
5515                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) {
5516                                                         sctp_m_freem(mm);
5517                                                 } else {
5518 #ifdef SCTP_MBUF_LOGGING
5519                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5520                                                                 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY);
5521                                                         }
5522 #endif
5523                                                         sctp_queue_op_err(stcb, mm);
5524                                                 }
5525                                         } else {
5526                                                 sctp_m_freem(mm);
5527                                         }
5528                                 }
5529                         }
5530                         if ((ch->chunk_type & 0x80) == 0) {
5531                                 /* discard this packet */
5532                                 *offset = length;
5533                                 return (stcb);
5534                         }       /* else skip this bad chunk and continue... */
5535                         break;
5536                 }               /* switch (ch->chunk_type) */
5537
5538
5539 next_chunk:
5540                 /* get the next chunk */
5541                 *offset += SCTP_SIZE32(chk_length);
5542                 if (*offset >= length) {
5543                         /* no more data left in the mbuf chain */
5544                         break;
5545                 }
5546                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5547                     sizeof(struct sctp_chunkhdr), chunk_buf);
5548                 if (ch == NULL) {
5549                         if (locked_tcb) {
5550                                 SCTP_TCB_UNLOCK(locked_tcb);
5551                         }
5552                         *offset = length;
5553                         return (NULL);
5554                 }
5555         }                       /* while */
5556
5557         if (asconf_cnt > 0 && stcb != NULL) {
5558                 sctp_send_asconf_ack(stcb);
5559         }
5560         return (stcb);
5561 }
5562
5563
5564 #ifdef INVARIANTS
5565 #ifdef __GNUC__
5566 __attribute__((noinline))
5567 #endif
5568         void
5569              sctp_validate_no_locks(struct sctp_inpcb *inp)
5570 {
5571         struct sctp_tcb *lstcb;
5572
5573         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5574                 if (mtx_owned(&lstcb->tcb_mtx)) {
5575                         panic("Own lock on stcb at return from input");
5576                 }
5577         }
5578         if (mtx_owned(&inp->inp_create_mtx)) {
5579                 panic("Own create lock on inp");
5580         }
5581         if (mtx_owned(&inp->inp_mtx)) {
5582                 panic("Own inp lock on inp");
5583         }
5584 }
5585
5586 #endif
5587
5588 /*
5589  * common input chunk processing (v4 and v6)
5590  */
5591 void
5592 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5593     struct sockaddr *src, struct sockaddr *dst,
5594     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5595 #if !defined(SCTP_WITH_NO_CSUM)
5596     uint8_t compute_crc,
5597 #endif
5598     uint8_t ecn_bits,
5599     uint8_t mflowtype, uint32_t mflowid,
5600     uint32_t vrf_id, uint16_t port)
5601 {
5602         uint32_t high_tsn;
5603         int fwd_tsn_seen = 0, data_processed = 0;
5604         struct mbuf *m = *mm, *op_err;
5605         char msg[SCTP_DIAG_INFO_LEN];
5606         int un_sent;
5607         int cnt_ctrl_ready = 0;
5608         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5609         struct sctp_tcb *stcb = NULL;
5610         struct sctp_nets *net = NULL;
5611
5612         SCTP_STAT_INCR(sctps_recvdatagrams);
5613 #ifdef SCTP_AUDITING_ENABLED
5614         sctp_audit_log(0xE0, 1);
5615         sctp_auditing(0, inp, stcb, net);
5616 #endif
5617 #if !defined(SCTP_WITH_NO_CSUM)
5618         if (compute_crc != 0) {
5619                 uint32_t check, calc_check;
5620
5621                 check = sh->checksum;
5622                 sh->checksum = 0;
5623                 calc_check = sctp_calculate_cksum(m, iphlen);
5624                 sh->checksum = check;
5625                 if (calc_check != check) {
5626                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5627                             calc_check, check, (void *)m, length, iphlen);
5628                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5629                             sh, ch, &inp, &net, vrf_id);
5630 #if defined(INET) || defined(INET6)
5631                         if ((net != NULL) && (port != 0)) {
5632                                 if (net->port == 0) {
5633                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5634                                 }
5635                                 net->port = port;
5636                         }
5637 #endif
5638                         if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
5639                                 net->flowtype = mflowtype;
5640                         }
5641                         if ((inp != NULL) && (stcb != NULL)) {
5642                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5643                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5644                         } else if ((inp != NULL) && (stcb == NULL)) {
5645                                 inp_decr = inp;
5646                         }
5647                         SCTP_STAT_INCR(sctps_badsum);
5648                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5649                         goto out;
5650                 }
5651         }
5652 #endif
5653         /* Destination port of 0 is illegal, based on RFC4960. */
5654         if (sh->dest_port == 0) {
5655                 SCTP_STAT_INCR(sctps_hdrops);
5656                 goto out;
5657         }
5658         stcb = sctp_findassociation_addr(m, offset, src, dst,
5659             sh, ch, &inp, &net, vrf_id);
5660 #if defined(INET) || defined(INET6)
5661         if ((net != NULL) && (port != 0)) {
5662                 if (net->port == 0) {
5663                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5664                 }
5665                 net->port = port;
5666         }
5667 #endif
5668         if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
5669                 net->flowtype = mflowtype;
5670         }
5671         if (inp == NULL) {
5672                 SCTP_STAT_INCR(sctps_noport);
5673                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5674                         goto out;
5675                 }
5676                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5677                         sctp_send_shutdown_complete2(src, dst, sh,
5678                             mflowtype, mflowid,
5679                             vrf_id, port);
5680                         goto out;
5681                 }
5682                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5683                         goto out;
5684                 }
5685                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5686                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5687                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5688                             (ch->chunk_type != SCTP_INIT))) {
5689                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5690                                     "Out of the blue");
5691                                 sctp_send_abort(m, iphlen, src, dst,
5692                                     sh, 0, op_err,
5693                                     mflowtype, mflowid,
5694                                     vrf_id, port);
5695                         }
5696                 }
5697                 goto out;
5698         } else if (stcb == NULL) {
5699                 inp_decr = inp;
5700         }
5701 #ifdef IPSEC
5702         /*-
5703          * I very much doubt any of the IPSEC stuff will work but I have no
5704          * idea, so I will leave it in place.
5705          */
5706         if (inp != NULL) {
5707                 switch (dst->sa_family) {
5708 #ifdef INET
5709                 case AF_INET:
5710                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5711                                 IPSECSTAT_INC(ips_in_polvio);
5712                                 SCTP_STAT_INCR(sctps_hdrops);
5713                                 goto out;
5714                         }
5715                         break;
5716 #endif
5717 #ifdef INET6
5718                 case AF_INET6:
5719                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5720                                 IPSEC6STAT_INC(ips_in_polvio);
5721                                 SCTP_STAT_INCR(sctps_hdrops);
5722                                 goto out;
5723                         }
5724                         break;
5725 #endif
5726                 default:
5727                         break;
5728                 }
5729         }
5730 #endif
5731         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5732             (void *)m, iphlen, offset, length, (void *)stcb);
5733         if (stcb) {
5734                 /* always clear this before beginning a packet */
5735                 stcb->asoc.authenticated = 0;
5736                 stcb->asoc.seen_a_sack_this_pkt = 0;
5737                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5738                     (void *)stcb, stcb->asoc.state);
5739
5740                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5741                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5742                         /*-
5743                          * If we hit here, we had a ref count
5744                          * up when the assoc was aborted and the
5745                          * timer is clearing out the assoc, we should
5746                          * NOT respond to any packet.. its OOTB.
5747                          */
5748                         SCTP_TCB_UNLOCK(stcb);
5749                         stcb = NULL;
5750                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5751                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5752                             msg);
5753                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5754                             mflowtype, mflowid,
5755                             vrf_id, port);
5756                         goto out;
5757                 }
5758         }
5759         if (IS_SCTP_CONTROL(ch)) {
5760                 /* process the control portion of the SCTP packet */
5761                 /* sa_ignore NO_NULL_CHK */
5762                 stcb = sctp_process_control(m, iphlen, &offset, length,
5763                     src, dst, sh, ch,
5764                     inp, stcb, &net, &fwd_tsn_seen,
5765                     mflowtype, mflowid,
5766                     vrf_id, port);
5767                 if (stcb) {
5768                         /*
5769                          * This covers us if the cookie-echo was there and
5770                          * it changes our INP.
5771                          */
5772                         inp = stcb->sctp_ep;
5773 #if defined(INET) || defined(INET6)
5774                         if ((net) && (port)) {
5775                                 if (net->port == 0) {
5776                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5777                                 }
5778                                 net->port = port;
5779                         }
5780 #endif
5781                 }
5782         } else {
5783                 /*
5784                  * no control chunks, so pre-process DATA chunks (these
5785                  * checks are taken care of by control processing)
5786                  */
5787
5788                 /*
5789                  * if DATA only packet, and auth is required, then punt...
5790                  * can't have authenticated without any AUTH (control)
5791                  * chunks
5792                  */
5793                 if ((stcb != NULL) &&
5794                     (stcb->asoc.auth_supported == 1) &&
5795                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5796                         /* "silently" ignore */
5797                         SCTP_STAT_INCR(sctps_recvauthmissing);
5798                         goto out;
5799                 }
5800                 if (stcb == NULL) {
5801                         /* out of the blue DATA chunk */
5802                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5803                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5804                             msg);
5805                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5806                             mflowtype, mflowid,
5807                             vrf_id, port);
5808                         goto out;
5809                 }
5810                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5811                         /* v_tag mismatch! */
5812                         SCTP_STAT_INCR(sctps_badvtag);
5813                         goto out;
5814                 }
5815         }
5816
5817         if (stcb == NULL) {
5818                 /*
5819                  * no valid TCB for this packet, or we found it's a bad
5820                  * packet while processing control, or we're done with this
5821                  * packet (done or skip rest of data), so we drop it...
5822                  */
5823                 goto out;
5824         }
5825         /*
5826          * DATA chunk processing
5827          */
5828         /* plow through the data chunks while length > offset */
5829
5830         /*
5831          * Rest should be DATA only.  Check authentication state if AUTH for
5832          * DATA is required.
5833          */
5834         if ((length > offset) &&
5835             (stcb != NULL) &&
5836             (stcb->asoc.auth_supported == 1) &&
5837             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5838             !stcb->asoc.authenticated) {
5839                 /* "silently" ignore */
5840                 SCTP_STAT_INCR(sctps_recvauthmissing);
5841                 SCTPDBG(SCTP_DEBUG_AUTH1,
5842                     "Data chunk requires AUTH, skipped\n");
5843                 goto trigger_send;
5844         }
5845         if (length > offset) {
5846                 int retval;
5847
5848                 /*
5849                  * First check to make sure our state is correct. We would
5850                  * not get here unless we really did have a tag, so we don't
5851                  * abort if this happens, just dump the chunk silently.
5852                  */
5853                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5854                 case SCTP_STATE_COOKIE_ECHOED:
5855                         /*
5856                          * we consider data with valid tags in this state
5857                          * shows us the cookie-ack was lost. Imply it was
5858                          * there.
5859                          */
5860                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5861                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5862                                     stcb->asoc.overall_error_count,
5863                                     0,
5864                                     SCTP_FROM_SCTP_INPUT,
5865                                     __LINE__);
5866                         }
5867                         stcb->asoc.overall_error_count = 0;
5868                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5869                         break;
5870                 case SCTP_STATE_COOKIE_WAIT:
5871                         /*
5872                          * We consider OOTB any data sent during asoc setup.
5873                          */
5874                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5875                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5876                             msg);
5877                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5878                             mflowtype, mflowid,
5879                             vrf_id, port);
5880                         goto out;
5881                         /* sa_ignore NOTREACHED */
5882                         break;
5883                 case SCTP_STATE_EMPTY:  /* should not happen */
5884                 case SCTP_STATE_INUSE:  /* should not happen */
5885                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5886                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5887                 default:
5888                         goto out;
5889                         /* sa_ignore NOTREACHED */
5890                         break;
5891                 case SCTP_STATE_OPEN:
5892                 case SCTP_STATE_SHUTDOWN_SENT:
5893                         break;
5894                 }
5895                 /* plow through the data chunks while length > offset */
5896                 retval = sctp_process_data(mm, iphlen, &offset, length,
5897                     src, dst, sh,
5898                     inp, stcb, net, &high_tsn,
5899                     mflowtype, mflowid,
5900                     vrf_id, port);
5901                 if (retval == 2) {
5902                         /*
5903                          * The association aborted, NO UNLOCK needed since
5904                          * the association is destroyed.
5905                          */
5906                         stcb = NULL;
5907                         goto out;
5908                 }
5909                 data_processed = 1;
5910                 /*
5911                  * Anything important needs to have been m_copy'ed in
5912                  * process_data
5913                  */
5914         }
5915         /* take care of ecn */
5916         if ((data_processed == 1) &&
5917             (stcb->asoc.ecn_supported == 1) &&
5918             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5919                 /* Yep, we need to add a ECNE */
5920                 sctp_send_ecn_echo(stcb, net, high_tsn);
5921         }
5922         if ((data_processed == 0) && (fwd_tsn_seen)) {
5923                 int was_a_gap;
5924                 uint32_t highest_tsn;
5925
5926                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5927                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5928                 } else {
5929                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5930                 }
5931                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5932                 stcb->asoc.send_sack = 1;
5933                 sctp_sack_check(stcb, was_a_gap);
5934         } else if (fwd_tsn_seen) {
5935                 stcb->asoc.send_sack = 1;
5936         }
5937         /* trigger send of any chunks in queue... */
5938 trigger_send:
5939 #ifdef SCTP_AUDITING_ENABLED
5940         sctp_audit_log(0xE0, 2);
5941         sctp_auditing(1, inp, stcb, net);
5942 #endif
5943         SCTPDBG(SCTP_DEBUG_INPUT1,
5944             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5945             stcb->asoc.peers_rwnd,
5946             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5947             stcb->asoc.total_flight);
5948         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5949         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5950                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5951         }
5952         if (cnt_ctrl_ready ||
5953             ((un_sent) &&
5954             (stcb->asoc.peers_rwnd > 0 ||
5955             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5956                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5957                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5958                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5959         }
5960 #ifdef SCTP_AUDITING_ENABLED
5961         sctp_audit_log(0xE0, 3);
5962         sctp_auditing(2, inp, stcb, net);
5963 #endif
5964 out:
5965         if (stcb != NULL) {
5966                 SCTP_TCB_UNLOCK(stcb);
5967         }
5968         if (inp_decr != NULL) {
5969                 /* reduce ref-count */
5970                 SCTP_INP_WLOCK(inp_decr);
5971                 SCTP_INP_DECR_REF(inp_decr);
5972                 SCTP_INP_WUNLOCK(inp_decr);
5973         }
5974 #ifdef INVARIANTS
5975         if (inp != NULL) {
5976                 sctp_validate_no_locks(inp);
5977         }
5978 #endif
5979         return;
5980 }
5981
5982 #if 0
5983 static void
5984 sctp_print_mbuf_chain(struct mbuf *m)
5985 {
5986         for (; m; m = SCTP_BUF_NEXT(m)) {
5987                 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
5988                 if (SCTP_BUF_IS_EXTENDED(m))
5989                         SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
5990         }
5991 }
5992
5993 #endif
5994
5995 #ifdef INET
5996 void
5997 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5998 {
5999         struct mbuf *m;
6000         int iphlen;
6001         uint32_t vrf_id = 0;
6002         uint8_t ecn_bits;
6003         struct sockaddr_in src, dst;
6004         struct ip *ip;
6005         struct sctphdr *sh;
6006         struct sctp_chunkhdr *ch;
6007         int length, offset;
6008
6009 #if !defined(SCTP_WITH_NO_CSUM)
6010         uint8_t compute_crc;
6011
6012 #endif
6013         uint32_t mflowid;
6014         uint8_t mflowtype;
6015
6016         iphlen = off;
6017         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6018                 SCTP_RELEASE_PKT(i_pak);
6019                 return;
6020         }
6021         m = SCTP_HEADER_TO_CHAIN(i_pak);
6022 #ifdef SCTP_MBUF_LOGGING
6023         /* Log in any input mbufs */
6024         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6025                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6026         }
6027 #endif
6028 #ifdef SCTP_PACKET_LOGGING
6029         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6030                 sctp_packet_log(m);
6031         }
6032 #endif
6033         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6034             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6035             m->m_pkthdr.len,
6036             if_name(m->m_pkthdr.rcvif),
6037             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6038         mflowid = m->m_pkthdr.flowid;
6039         mflowtype = M_HASHTYPE_GET(m);
6040         SCTP_STAT_INCR(sctps_recvpackets);
6041         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6042         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6043         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6044         if (SCTP_BUF_LEN(m) < offset) {
6045                 if ((m = m_pullup(m, offset)) == NULL) {
6046                         SCTP_STAT_INCR(sctps_hdrops);
6047                         return;
6048                 }
6049         }
6050         ip = mtod(m, struct ip *);
6051         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6052         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6053         offset -= sizeof(struct sctp_chunkhdr);
6054         memset(&src, 0, sizeof(struct sockaddr_in));
6055         src.sin_family = AF_INET;
6056         src.sin_len = sizeof(struct sockaddr_in);
6057         src.sin_port = sh->src_port;
6058         src.sin_addr = ip->ip_src;
6059         memset(&dst, 0, sizeof(struct sockaddr_in));
6060         dst.sin_family = AF_INET;
6061         dst.sin_len = sizeof(struct sockaddr_in);
6062         dst.sin_port = sh->dest_port;
6063         dst.sin_addr = ip->ip_dst;
6064         length = ntohs(ip->ip_len);
6065         /* Validate mbuf chain length with IP payload length. */
6066         if (SCTP_HEADER_LEN(m) != length) {
6067                 SCTPDBG(SCTP_DEBUG_INPUT1,
6068                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6069                 SCTP_STAT_INCR(sctps_hdrops);
6070                 goto out;
6071         }
6072         /* SCTP does not allow broadcasts or multicasts */
6073         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6074                 goto out;
6075         }
6076         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6077                 goto out;
6078         }
6079         ecn_bits = ip->ip_tos;
6080 #if defined(SCTP_WITH_NO_CSUM)
6081         SCTP_STAT_INCR(sctps_recvnocrc);
6082 #else
6083         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6084                 SCTP_STAT_INCR(sctps_recvhwcrc);
6085                 compute_crc = 0;
6086         } else {
6087                 SCTP_STAT_INCR(sctps_recvswcrc);
6088                 compute_crc = 1;
6089         }
6090 #endif
6091         sctp_common_input_processing(&m, iphlen, offset, length,
6092             (struct sockaddr *)&src,
6093             (struct sockaddr *)&dst,
6094             sh, ch,
6095 #if !defined(SCTP_WITH_NO_CSUM)
6096             compute_crc,
6097 #endif
6098             ecn_bits,
6099             mflowtype, mflowid,
6100             vrf_id, port);
6101 out:
6102         if (m) {
6103                 sctp_m_freem(m);
6104         }
6105         return;
6106 }
6107
6108 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6109 extern int *sctp_cpuarry;
6110
6111 #endif
6112
6113 void
6114 sctp_input(struct mbuf *m, int off)
6115 {
6116 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6117         struct ip *ip;
6118         struct sctphdr *sh;
6119         int offset;
6120         int cpu_to_use;
6121         uint32_t flowid, tag;
6122
6123         if (mp_ncpus > 1) {
6124                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6125                         flowid = m->m_pkthdr.flowid;
6126                 } else {
6127                         /*
6128                          * No flow id built by lower layers fix it so we
6129                          * create one.
6130                          */
6131                         offset = off + sizeof(struct sctphdr);
6132                         if (SCTP_BUF_LEN(m) < offset) {
6133                                 if ((m = m_pullup(m, offset)) == NULL) {
6134                                         SCTP_STAT_INCR(sctps_hdrops);
6135                                         return;
6136                                 }
6137                         }
6138                         ip = mtod(m, struct ip *);
6139                         sh = (struct sctphdr *)((caddr_t)ip + off);
6140                         tag = htonl(sh->v_tag);
6141                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6142                         m->m_pkthdr.flowid = flowid;
6143                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6144                 }
6145                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6146                 sctp_queue_to_mcore(m, off, cpu_to_use);
6147                 return;
6148         }
6149 #endif
6150         sctp_input_with_port(m, off, 0);
6151 }
6152
6153 #endif