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         /* calculate the RTT */
2329         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2330         if ((netp) && (*netp)) {
2331                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2332                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2333                     SCTP_RTT_FROM_NON_DATA);
2334         }
2335         /* respond with a COOKIE-ACK */
2336         sctp_send_cookie_ack(stcb);
2337
2338         /*
2339          * check the address lists for any ASCONFs that need to be sent
2340          * AFTER the cookie-ack is sent
2341          */
2342         sctp_check_address_list(stcb, m,
2343             initack_offset + sizeof(struct sctp_init_ack_chunk),
2344             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2345             &store.sa, cookie->local_scope, cookie->site_scope,
2346             cookie->ipv4_scope, cookie->loopback_scope);
2347
2348
2349         return (stcb);
2350 }
2351
2352 /*
2353  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2354  * we NEED to make sure we are not already using the vtag. If so we
2355  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2356         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2357                                                             SCTP_BASE_INFO(hashasocmark))];
2358         LIST_FOREACH(stcb, head, sctp_asocs) {
2359                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2360                        -- SEND ABORT - TRY AGAIN --
2361                 }
2362         }
2363 */
2364
2365 /*
2366  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2367  * existing (non-NULL) TCB
2368  */
2369 static struct mbuf *
2370 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2371     struct sockaddr *src, struct sockaddr *dst,
2372     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2373     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2374     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2375     struct sctp_tcb **locked_tcb,
2376     uint8_t mflowtype, uint32_t mflowid,
2377     uint32_t vrf_id, uint16_t port)
2378 {
2379         struct sctp_state_cookie *cookie;
2380         struct sctp_tcb *l_stcb = *stcb;
2381         struct sctp_inpcb *l_inp;
2382         struct sockaddr *to;
2383         struct sctp_pcb *ep;
2384         struct mbuf *m_sig;
2385         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2386         uint8_t *sig;
2387         uint8_t cookie_ok = 0;
2388         unsigned int sig_offset, cookie_offset;
2389         unsigned int cookie_len;
2390         struct timeval now;
2391         struct timeval time_expires;
2392         int notification = 0;
2393         struct sctp_nets *netl;
2394         int had_a_existing_tcb = 0;
2395         int send_int_conf = 0;
2396
2397 #ifdef INET
2398         struct sockaddr_in sin;
2399
2400 #endif
2401 #ifdef INET6
2402         struct sockaddr_in6 sin6;
2403
2404 #endif
2405
2406         SCTPDBG(SCTP_DEBUG_INPUT2,
2407             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2408
2409         if (inp_p == NULL) {
2410                 return (NULL);
2411         }
2412         cookie = &cp->cookie;
2413         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2414         cookie_len = ntohs(cp->ch.chunk_length);
2415
2416         if ((cookie->peerport != sh->src_port) &&
2417             (cookie->myport != sh->dest_port) &&
2418             (cookie->my_vtag != sh->v_tag)) {
2419                 /*
2420                  * invalid ports or bad tag.  Note that we always leave the
2421                  * v_tag in the header in network order and when we stored
2422                  * it in the my_vtag slot we also left it in network order.
2423                  * This maintains the match even though it may be in the
2424                  * opposite byte order of the machine :->
2425                  */
2426                 return (NULL);
2427         }
2428         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2429             sizeof(struct sctp_init_chunk) +
2430             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2431                 /* cookie too small */
2432                 return (NULL);
2433         }
2434         /*
2435          * split off the signature into its own mbuf (since it should not be
2436          * calculated in the sctp_hmac_m() call).
2437          */
2438         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2439         m_sig = m_split(m, sig_offset, M_NOWAIT);
2440         if (m_sig == NULL) {
2441                 /* out of memory or ?? */
2442                 return (NULL);
2443         }
2444 #ifdef SCTP_MBUF_LOGGING
2445         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2446                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2447         }
2448 #endif
2449
2450         /*
2451          * compute the signature/digest for the cookie
2452          */
2453         ep = &(*inp_p)->sctp_ep;
2454         l_inp = *inp_p;
2455         if (l_stcb) {
2456                 SCTP_TCB_UNLOCK(l_stcb);
2457         }
2458         SCTP_INP_RLOCK(l_inp);
2459         if (l_stcb) {
2460                 SCTP_TCB_LOCK(l_stcb);
2461         }
2462         /* which cookie is it? */
2463         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2464             (ep->current_secret_number != ep->last_secret_number)) {
2465                 /* it's the old cookie */
2466                 (void)sctp_hmac_m(SCTP_HMAC,
2467                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2468                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2469         } else {
2470                 /* it's the current cookie */
2471                 (void)sctp_hmac_m(SCTP_HMAC,
2472                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2473                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2474         }
2475         /* get the signature */
2476         SCTP_INP_RUNLOCK(l_inp);
2477         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2478         if (sig == NULL) {
2479                 /* couldn't find signature */
2480                 sctp_m_freem(m_sig);
2481                 return (NULL);
2482         }
2483         /* compare the received digest with the computed digest */
2484         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2485                 /* try the old cookie? */
2486                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2487                     (ep->current_secret_number != ep->last_secret_number)) {
2488                         /* compute digest with old */
2489                         (void)sctp_hmac_m(SCTP_HMAC,
2490                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2491                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2492                         /* compare */
2493                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2494                                 cookie_ok = 1;
2495                 }
2496         } else {
2497                 cookie_ok = 1;
2498         }
2499
2500         /*
2501          * Now before we continue we must reconstruct our mbuf so that
2502          * normal processing of any other chunks will work.
2503          */
2504         {
2505                 struct mbuf *m_at;
2506
2507                 m_at = m;
2508                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2509                         m_at = SCTP_BUF_NEXT(m_at);
2510                 }
2511                 SCTP_BUF_NEXT(m_at) = m_sig;
2512         }
2513
2514         if (cookie_ok == 0) {
2515                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2516                 SCTPDBG(SCTP_DEBUG_INPUT2,
2517                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2518                     (uint32_t) offset, cookie_offset, sig_offset);
2519                 return (NULL);
2520         }
2521         /*
2522          * check the cookie timestamps to be sure it's not stale
2523          */
2524         (void)SCTP_GETTIME_TIMEVAL(&now);
2525         /* Expire time is in Ticks, so we convert to seconds */
2526         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2527         time_expires.tv_usec = cookie->time_entered.tv_usec;
2528         /*
2529          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2530          * is undefined.
2531          */
2532         if (timevalcmp(&now, &time_expires, >)) {
2533                 /* cookie is stale! */
2534                 struct mbuf *op_err;
2535                 struct sctp_stale_cookie_msg *scm;
2536                 uint32_t tim;
2537
2538                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2539                     0, M_NOWAIT, 1, MT_DATA);
2540                 if (op_err == NULL) {
2541                         /* FOOBAR */
2542                         return (NULL);
2543                 }
2544                 /* Set the len */
2545                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2546                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2547                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2548                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2549                     (sizeof(uint32_t))));
2550                 /* seconds to usec */
2551                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2552                 /* add in usec */
2553                 if (tim == 0)
2554                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2555                 scm->time_usec = htonl(tim);
2556                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2557                     mflowtype, mflowid,
2558                     vrf_id, port);
2559                 return (NULL);
2560         }
2561         /*
2562          * Now we must see with the lookup address if we have an existing
2563          * asoc. This will only happen if we were in the COOKIE-WAIT state
2564          * and a INIT collided with us and somewhere the peer sent the
2565          * cookie on another address besides the single address our assoc
2566          * had for him. In this case we will have one of the tie-tags set at
2567          * least AND the address field in the cookie can be used to look it
2568          * up.
2569          */
2570         to = NULL;
2571         switch (cookie->addr_type) {
2572 #ifdef INET6
2573         case SCTP_IPV6_ADDRESS:
2574                 memset(&sin6, 0, sizeof(sin6));
2575                 sin6.sin6_family = AF_INET6;
2576                 sin6.sin6_len = sizeof(sin6);
2577                 sin6.sin6_port = sh->src_port;
2578                 sin6.sin6_scope_id = cookie->scope_id;
2579                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2580                     sizeof(sin6.sin6_addr.s6_addr));
2581                 to = (struct sockaddr *)&sin6;
2582                 break;
2583 #endif
2584 #ifdef INET
2585         case SCTP_IPV4_ADDRESS:
2586                 memset(&sin, 0, sizeof(sin));
2587                 sin.sin_family = AF_INET;
2588                 sin.sin_len = sizeof(sin);
2589                 sin.sin_port = sh->src_port;
2590                 sin.sin_addr.s_addr = cookie->address[0];
2591                 to = (struct sockaddr *)&sin;
2592                 break;
2593 #endif
2594         default:
2595                 /* This should not happen */
2596                 return (NULL);
2597         }
2598         if ((*stcb == NULL) && to) {
2599                 /* Yep, lets check */
2600                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2601                 if (*stcb == NULL) {
2602                         /*
2603                          * We should have only got back the same inp. If we
2604                          * got back a different ep we have a problem. The
2605                          * original findep got back l_inp and now
2606                          */
2607                         if (l_inp != *inp_p) {
2608                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2609                         }
2610                 } else {
2611                         if (*locked_tcb == NULL) {
2612                                 /*
2613                                  * In this case we found the assoc only
2614                                  * after we locked the create lock. This
2615                                  * means we are in a colliding case and we
2616                                  * must make sure that we unlock the tcb if
2617                                  * its one of the cases where we throw away
2618                                  * the incoming packets.
2619                                  */
2620                                 *locked_tcb = *stcb;
2621
2622                                 /*
2623                                  * We must also increment the inp ref count
2624                                  * since the ref_count flags was set when we
2625                                  * did not find the TCB, now we found it
2626                                  * which reduces the refcount.. we must
2627                                  * raise it back out to balance it all :-)
2628                                  */
2629                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2630                                 if ((*stcb)->sctp_ep != l_inp) {
2631                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2632                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2633                                 }
2634                         }
2635                 }
2636         }
2637         if (to == NULL) {
2638                 return (NULL);
2639         }
2640         cookie_len -= SCTP_SIGNATURE_SIZE;
2641         if (*stcb == NULL) {
2642                 /* this is the "normal" case... get a new TCB */
2643                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2644                     cookie, cookie_len, *inp_p,
2645                     netp, to, &notification,
2646                     auth_skipped, auth_offset, auth_len,
2647                     mflowtype, mflowid,
2648                     vrf_id, port);
2649         } else {
2650                 /* this is abnormal... cookie-echo on existing TCB */
2651                 had_a_existing_tcb = 1;
2652                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2653                     src, dst, sh,
2654                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2655                     &notification, auth_skipped, auth_offset, auth_len,
2656                     mflowtype, mflowid,
2657                     vrf_id, port);
2658         }
2659
2660         if (*stcb == NULL) {
2661                 /* still no TCB... must be bad cookie-echo */
2662                 return (NULL);
2663         }
2664         if ((*netp != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
2665                 (*netp)->flowtype = mflowtype;
2666         }
2667         /*
2668          * Ok, we built an association so confirm the address we sent the
2669          * INIT-ACK to.
2670          */
2671         netl = sctp_findnet(*stcb, to);
2672         /*
2673          * This code should in theory NOT run but
2674          */
2675         if (netl == NULL) {
2676                 /* TSNH! Huh, why do I need to add this address here? */
2677                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2678                         return (NULL);
2679                 }
2680                 netl = sctp_findnet(*stcb, to);
2681         }
2682         if (netl) {
2683                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2684                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2685                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2686                             netl);
2687                         send_int_conf = 1;
2688                 }
2689         }
2690         sctp_start_net_timers(*stcb);
2691         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2692                 if (!had_a_existing_tcb ||
2693                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2694                         /*
2695                          * If we have a NEW cookie or the connect never
2696                          * reached the connected state during collision we
2697                          * must do the TCP accept thing.
2698                          */
2699                         struct socket *so, *oso;
2700                         struct sctp_inpcb *inp;
2701
2702                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2703                                 /*
2704                                  * For a restart we will keep the same
2705                                  * socket, no need to do anything. I THINK!!
2706                                  */
2707                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2708                                 if (send_int_conf) {
2709                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2710                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2711                                 }
2712                                 return (m);
2713                         }
2714                         oso = (*inp_p)->sctp_socket;
2715                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2716                         SCTP_TCB_UNLOCK((*stcb));
2717                         CURVNET_SET(oso->so_vnet);
2718                         so = sonewconn(oso, 0
2719                             );
2720                         CURVNET_RESTORE();
2721                         SCTP_TCB_LOCK((*stcb));
2722                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2723
2724                         if (so == NULL) {
2725                                 struct mbuf *op_err;
2726
2727 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2728                                 struct socket *pcb_so;
2729
2730 #endif
2731                                 /* Too many sockets */
2732                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2733                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2734                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2735                                     src, dst, sh, op_err,
2736                                     mflowtype, mflowid,
2737                                     vrf_id, port);
2738 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2739                                 pcb_so = SCTP_INP_SO(*inp_p);
2740                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2741                                 SCTP_TCB_UNLOCK((*stcb));
2742                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2743                                 SCTP_TCB_LOCK((*stcb));
2744                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2745 #endif
2746                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2747 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2748                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2749 #endif
2750                                 return (NULL);
2751                         }
2752                         inp = (struct sctp_inpcb *)so->so_pcb;
2753                         SCTP_INP_INCR_REF(inp);
2754                         /*
2755                          * We add the unbound flag here so that if we get an
2756                          * soabort() before we get the move_pcb done, we
2757                          * will properly cleanup.
2758                          */
2759                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2760                             SCTP_PCB_FLAGS_CONNECTED |
2761                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2762                             SCTP_PCB_FLAGS_UNBOUND |
2763                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2764                             SCTP_PCB_FLAGS_DONT_WAKE);
2765                         inp->sctp_features = (*inp_p)->sctp_features;
2766                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2767                         inp->sctp_socket = so;
2768                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2769                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2770                         inp->ecn_supported = (*inp_p)->ecn_supported;
2771                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2772                         inp->auth_supported = (*inp_p)->auth_supported;
2773                         inp->asconf_supported = (*inp_p)->asconf_supported;
2774                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2775                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2776                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2777                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2778                         inp->sctp_context = (*inp_p)->sctp_context;
2779                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2780                         inp->inp_starting_point_for_iterator = NULL;
2781                         /*
2782                          * copy in the authentication parameters from the
2783                          * original endpoint
2784                          */
2785                         if (inp->sctp_ep.local_hmacs)
2786                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2787                         inp->sctp_ep.local_hmacs =
2788                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2789                         if (inp->sctp_ep.local_auth_chunks)
2790                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2791                         inp->sctp_ep.local_auth_chunks =
2792                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2793
2794                         /*
2795                          * Now we must move it from one hash table to
2796                          * another and get the tcb in the right place.
2797                          */
2798
2799                         /*
2800                          * This is where the one-2-one socket is put into
2801                          * the accept state waiting for the accept!
2802                          */
2803                         if (*stcb) {
2804                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2805                         }
2806                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2807
2808                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2809                         SCTP_TCB_UNLOCK((*stcb));
2810
2811                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2812                             0);
2813                         SCTP_TCB_LOCK((*stcb));
2814                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2815
2816
2817                         /*
2818                          * now we must check to see if we were aborted while
2819                          * the move was going on and the lock/unlock
2820                          * happened.
2821                          */
2822                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2823                                 /*
2824                                  * yep it was, we leave the assoc attached
2825                                  * to the socket since the sctp_inpcb_free()
2826                                  * call will send an abort for us.
2827                                  */
2828                                 SCTP_INP_DECR_REF(inp);
2829                                 return (NULL);
2830                         }
2831                         SCTP_INP_DECR_REF(inp);
2832                         /* Switch over to the new guy */
2833                         *inp_p = inp;
2834                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2835                         if (send_int_conf) {
2836                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2837                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2838                         }
2839                         /*
2840                          * Pull it from the incomplete queue and wake the
2841                          * guy
2842                          */
2843 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2844                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2845                         SCTP_TCB_UNLOCK((*stcb));
2846                         SCTP_SOCKET_LOCK(so, 1);
2847 #endif
2848                         soisconnected(so);
2849 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2850                         SCTP_TCB_LOCK((*stcb));
2851                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2852                         SCTP_SOCKET_UNLOCK(so, 1);
2853 #endif
2854                         return (m);
2855                 }
2856         }
2857         if (notification) {
2858                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2859         }
2860         if (send_int_conf) {
2861                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2862                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2863         }
2864         return (m);
2865 }
2866
2867 static void
2868 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2869     struct sctp_tcb *stcb, struct sctp_nets *net)
2870 {
2871         /* cp must not be used, others call this without a c-ack :-) */
2872         struct sctp_association *asoc;
2873
2874         SCTPDBG(SCTP_DEBUG_INPUT2,
2875             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2876         if ((stcb == NULL) || (net == NULL)) {
2877                 return;
2878         }
2879         asoc = &stcb->asoc;
2880
2881         sctp_stop_all_cookie_timers(stcb);
2882         /* process according to association state */
2883         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2884                 /* state change only needed when I am in right state */
2885                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2886                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2887                 sctp_start_net_timers(stcb);
2888                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2889                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2890                             stcb->sctp_ep, stcb, asoc->primary_destination);
2891
2892                 }
2893                 /* update RTO */
2894                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2895                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2896                 if (asoc->overall_error_count == 0) {
2897                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2898                             &asoc->time_entered, sctp_align_safe_nocopy,
2899                             SCTP_RTT_FROM_NON_DATA);
2900                 }
2901                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2902                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2903                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2904                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2905 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2906                         struct socket *so;
2907
2908 #endif
2909                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2910 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2911                         so = SCTP_INP_SO(stcb->sctp_ep);
2912                         atomic_add_int(&stcb->asoc.refcnt, 1);
2913                         SCTP_TCB_UNLOCK(stcb);
2914                         SCTP_SOCKET_LOCK(so, 1);
2915                         SCTP_TCB_LOCK(stcb);
2916                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2917 #endif
2918                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2919                                 soisconnected(stcb->sctp_socket);
2920                         }
2921 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2922                         SCTP_SOCKET_UNLOCK(so, 1);
2923 #endif
2924                 }
2925                 /*
2926                  * since we did not send a HB make sure we don't double
2927                  * things
2928                  */
2929                 net->hb_responded = 1;
2930
2931                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2932                         /*
2933                          * We don't need to do the asconf thing, nor hb or
2934                          * autoclose if the socket is closed.
2935                          */
2936                         goto closed_socket;
2937                 }
2938                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2939                     stcb, net);
2940
2941
2942                 if (stcb->asoc.sctp_autoclose_ticks &&
2943                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2944                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2945                             stcb->sctp_ep, stcb, NULL);
2946                 }
2947                 /*
2948                  * send ASCONF if parameters are pending and ASCONFs are
2949                  * allowed (eg. addresses changed when init/cookie echo were
2950                  * in flight)
2951                  */
2952                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2953                     (stcb->asoc.asconf_supported == 1) &&
2954                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2955 #ifdef SCTP_TIMER_BASED_ASCONF
2956                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2957                             stcb->sctp_ep, stcb,
2958                             stcb->asoc.primary_destination);
2959 #else
2960                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2961                             SCTP_ADDR_NOT_LOCKED);
2962 #endif
2963                 }
2964         }
2965 closed_socket:
2966         /* Toss the cookie if I can */
2967         sctp_toss_old_cookies(stcb, asoc);
2968         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2969                 /* Restart the timer if we have pending data */
2970                 struct sctp_tmit_chunk *chk;
2971
2972                 chk = TAILQ_FIRST(&asoc->sent_queue);
2973                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2974         }
2975 }
2976
2977 static void
2978 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2979     struct sctp_tcb *stcb)
2980 {
2981         struct sctp_nets *net;
2982         struct sctp_tmit_chunk *lchk;
2983         struct sctp_ecne_chunk bkup;
2984         uint8_t override_bit;
2985         uint32_t tsn, window_data_tsn;
2986         int len;
2987         unsigned int pkt_cnt;
2988
2989         len = ntohs(cp->ch.chunk_length);
2990         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2991             (len != sizeof(struct old_sctp_ecne_chunk))) {
2992                 return;
2993         }
2994         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2995                 /* Its the old format */
2996                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2997                 bkup.num_pkts_since_cwr = htonl(1);
2998                 cp = &bkup;
2999         }
3000         SCTP_STAT_INCR(sctps_recvecne);
3001         tsn = ntohl(cp->tsn);
3002         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3003         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3004         if (lchk == NULL) {
3005                 window_data_tsn = stcb->asoc.sending_seq - 1;
3006         } else {
3007                 window_data_tsn = lchk->rec.data.TSN_seq;
3008         }
3009
3010         /* Find where it was sent to if possible. */
3011         net = NULL;
3012         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3013                 if (lchk->rec.data.TSN_seq == tsn) {
3014                         net = lchk->whoTo;
3015                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3016                         break;
3017                 }
3018                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3019                         break;
3020                 }
3021         }
3022         if (net == NULL) {
3023                 /*
3024                  * What to do. A previous send of a CWR was possibly lost.
3025                  * See how old it is, we may have it marked on the actual
3026                  * net.
3027                  */
3028                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3029                         if (tsn == net->last_cwr_tsn) {
3030                                 /* Found him, send it off */
3031                                 break;
3032                         }
3033                 }
3034                 if (net == NULL) {
3035                         /*
3036                          * If we reach here, we need to send a special CWR
3037                          * that says hey, we did this a long time ago and
3038                          * you lost the response.
3039                          */
3040                         net = TAILQ_FIRST(&stcb->asoc.nets);
3041                         if (net == NULL) {
3042                                 /* TSNH */
3043                                 return;
3044                         }
3045                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3046                 } else {
3047                         override_bit = 0;
3048                 }
3049         } else {
3050                 override_bit = 0;
3051         }
3052         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3053             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3054                 /*
3055                  * JRS - Use the congestion control given in the pluggable
3056                  * CC module
3057                  */
3058                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3059                 /*
3060                  * We reduce once every RTT. So we will only lower cwnd at
3061                  * the next sending seq i.e. the window_data_tsn
3062                  */
3063                 net->cwr_window_tsn = window_data_tsn;
3064                 net->ecn_ce_pkt_cnt += pkt_cnt;
3065                 net->lost_cnt = pkt_cnt;
3066                 net->last_cwr_tsn = tsn;
3067         } else {
3068                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3069                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3070                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3071                         /*
3072                          * Another loss in the same window update how many
3073                          * marks/packets lost we have had.
3074                          */
3075                         int cnt = 1;
3076
3077                         if (pkt_cnt > net->lost_cnt) {
3078                                 /* Should be the case */
3079                                 cnt = (pkt_cnt - net->lost_cnt);
3080                                 net->ecn_ce_pkt_cnt += cnt;
3081                         }
3082                         net->lost_cnt = pkt_cnt;
3083                         net->last_cwr_tsn = tsn;
3084                         /*
3085                          * Most CC functions will ignore this call, since we
3086                          * are in-window yet of the initial CE the peer saw.
3087                          */
3088                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3089                 }
3090         }
3091         /*
3092          * We always send a CWR this way if our previous one was lost our
3093          * peer will get an update, or if it is not time again to reduce we
3094          * still get the cwr to the peer. Note we set the override when we
3095          * could not find the TSN on the chunk or the destination network.
3096          */
3097         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3098 }
3099
3100 static void
3101 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3102 {
3103         /*
3104          * Here we get a CWR from the peer. We must look in the outqueue and
3105          * make sure that we have a covered ECNE in the control chunk part.
3106          * If so remove it.
3107          */
3108         struct sctp_tmit_chunk *chk;
3109         struct sctp_ecne_chunk *ecne;
3110         int override;
3111         uint32_t cwr_tsn;
3112
3113         cwr_tsn = ntohl(cp->tsn);
3114
3115         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3116         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3117                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3118                         continue;
3119                 }
3120                 if ((override == 0) && (chk->whoTo != net)) {
3121                         /* Must be from the right src unless override is set */
3122                         continue;
3123                 }
3124                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3125                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3126                         /* this covers this ECNE, we can remove it */
3127                         stcb->asoc.ecn_echo_cnt_onq--;
3128                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3129                             sctp_next);
3130                         if (chk->data) {
3131                                 sctp_m_freem(chk->data);
3132                                 chk->data = NULL;
3133                         }
3134                         stcb->asoc.ctrl_queue_cnt--;
3135                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3136                         if (override == 0) {
3137                                 break;
3138                         }
3139                 }
3140         }
3141 }
3142
3143 static void
3144 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3145     struct sctp_tcb *stcb, struct sctp_nets *net)
3146 {
3147         struct sctp_association *asoc;
3148
3149 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3150         struct socket *so;
3151
3152 #endif
3153
3154         SCTPDBG(SCTP_DEBUG_INPUT2,
3155             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3156         if (stcb == NULL)
3157                 return;
3158
3159         asoc = &stcb->asoc;
3160         /* process according to association state */
3161         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3162                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3163                 SCTPDBG(SCTP_DEBUG_INPUT2,
3164                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3165                 SCTP_TCB_UNLOCK(stcb);
3166                 return;
3167         }
3168         /* notify upper layer protocol */
3169         if (stcb->sctp_socket) {
3170                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3171         }
3172 #ifdef INVARIANTS
3173         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3174             !TAILQ_EMPTY(&asoc->sent_queue) ||
3175             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3176                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3177         }
3178 #endif
3179         /* stop the timer */
3180         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3181         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3182         /* free the TCB */
3183         SCTPDBG(SCTP_DEBUG_INPUT2,
3184             "sctp_handle_shutdown_complete: calls free-asoc\n");
3185 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3186         so = SCTP_INP_SO(stcb->sctp_ep);
3187         atomic_add_int(&stcb->asoc.refcnt, 1);
3188         SCTP_TCB_UNLOCK(stcb);
3189         SCTP_SOCKET_LOCK(so, 1);
3190         SCTP_TCB_LOCK(stcb);
3191         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3192 #endif
3193         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3194 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3195         SCTP_SOCKET_UNLOCK(so, 1);
3196 #endif
3197         return;
3198 }
3199
3200 static int
3201 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3202     struct sctp_nets *net, uint8_t flg)
3203 {
3204         switch (desc->chunk_type) {
3205         case SCTP_DATA:
3206                 /* find the tsn to resend (possibly */
3207                 {
3208                         uint32_t tsn;
3209                         struct sctp_tmit_chunk *tp1;
3210
3211                         tsn = ntohl(desc->tsn_ifany);
3212                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3213                                 if (tp1->rec.data.TSN_seq == tsn) {
3214                                         /* found it */
3215                                         break;
3216                                 }
3217                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3218                                         /* not found */
3219                                         tp1 = NULL;
3220                                         break;
3221                                 }
3222                         }
3223                         if (tp1 == NULL) {
3224                                 /*
3225                                  * Do it the other way , aka without paying
3226                                  * attention to queue seq order.
3227                                  */
3228                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3229                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3230                                         if (tp1->rec.data.TSN_seq == tsn) {
3231                                                 /* found it */
3232                                                 break;
3233                                         }
3234                                 }
3235                         }
3236                         if (tp1 == NULL) {
3237                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3238                         }
3239                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3240                                 uint8_t *ddp;
3241
3242                                 if (((flg & SCTP_BADCRC) == 0) &&
3243                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3244                                         return (0);
3245                                 }
3246                                 if ((stcb->asoc.peers_rwnd == 0) &&
3247                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3248                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3249                                         return (0);
3250                                 }
3251                                 if (stcb->asoc.peers_rwnd == 0 &&
3252                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3253                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3254                                         return (0);
3255                                 }
3256                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3257                                     sizeof(struct sctp_data_chunk));
3258                                 {
3259                                         unsigned int iii;
3260
3261                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3262                                             iii++) {
3263                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3264                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3265                                                         return (-1);
3266                                                 }
3267                                         }
3268                                 }
3269
3270                                 if (tp1->do_rtt) {
3271                                         /*
3272                                          * this guy had a RTO calculation
3273                                          * pending on it, cancel it
3274                                          */
3275                                         if (tp1->whoTo->rto_needed == 0) {
3276                                                 tp1->whoTo->rto_needed = 1;
3277                                         }
3278                                         tp1->do_rtt = 0;
3279                                 }
3280                                 SCTP_STAT_INCR(sctps_pdrpmark);
3281                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3282                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3283                                 /*
3284                                  * mark it as if we were doing a FR, since
3285                                  * we will be getting gap ack reports behind
3286                                  * the info from the router.
3287                                  */
3288                                 tp1->rec.data.doing_fast_retransmit = 1;
3289                                 /*
3290                                  * mark the tsn with what sequences can
3291                                  * cause a new FR.
3292                                  */
3293                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3294                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3295                                 } else {
3296                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3297                                 }
3298
3299                                 /* restart the timer */
3300                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3301                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3302                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3303                                     stcb, tp1->whoTo);
3304
3305                                 /* fix counts and things */
3306                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3307                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3308                                             tp1->whoTo->flight_size,
3309                                             tp1->book_size,
3310                                             (uintptr_t) stcb,
3311                                             tp1->rec.data.TSN_seq);
3312                                 }
3313                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3314                                         sctp_flight_size_decrease(tp1);
3315                                         sctp_total_flight_decrease(stcb, tp1);
3316                                 }
3317                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3318                         } {
3319                                 /* audit code */
3320                                 unsigned int audit;
3321
3322                                 audit = 0;
3323                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3324                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3325                                                 audit++;
3326                                 }
3327                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3328                                     sctp_next) {
3329                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3330                                                 audit++;
3331                                 }
3332                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3333                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3334                                             audit, stcb->asoc.sent_queue_retran_cnt);
3335 #ifndef SCTP_AUDITING_ENABLED
3336                                         stcb->asoc.sent_queue_retran_cnt = audit;
3337 #endif
3338                                 }
3339                         }
3340                 }
3341                 break;
3342         case SCTP_ASCONF:
3343                 {
3344                         struct sctp_tmit_chunk *asconf;
3345
3346                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3347                             sctp_next) {
3348                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3349                                         break;
3350                                 }
3351                         }
3352                         if (asconf) {
3353                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3354                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3355                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3356                                 asconf->snd_count--;
3357                         }
3358                 }
3359                 break;
3360         case SCTP_INITIATION:
3361                 /* resend the INIT */
3362                 stcb->asoc.dropped_special_cnt++;
3363                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3364                         /*
3365                          * If we can get it in, in a few attempts we do
3366                          * this, otherwise we let the timer fire.
3367                          */
3368                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3369                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3370                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3371                 }
3372                 break;
3373         case SCTP_SELECTIVE_ACK:
3374         case SCTP_NR_SELECTIVE_ACK:
3375                 /* resend the sack */
3376                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3377                 break;
3378         case SCTP_HEARTBEAT_REQUEST:
3379                 /* resend a demand HB */
3380                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3381                         /*
3382                          * Only retransmit if we KNOW we wont destroy the
3383                          * tcb
3384                          */
3385                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3386                 }
3387                 break;
3388         case SCTP_SHUTDOWN:
3389                 sctp_send_shutdown(stcb, net);
3390                 break;
3391         case SCTP_SHUTDOWN_ACK:
3392                 sctp_send_shutdown_ack(stcb, net);
3393                 break;
3394         case SCTP_COOKIE_ECHO:
3395                 {
3396                         struct sctp_tmit_chunk *cookie;
3397
3398                         cookie = NULL;
3399                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3400                             sctp_next) {
3401                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3402                                         break;
3403                                 }
3404                         }
3405                         if (cookie) {
3406                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3407                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3408                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3409                                 sctp_stop_all_cookie_timers(stcb);
3410                         }
3411                 }
3412                 break;
3413         case SCTP_COOKIE_ACK:
3414                 sctp_send_cookie_ack(stcb);
3415                 break;
3416         case SCTP_ASCONF_ACK:
3417                 /* resend last asconf ack */
3418                 sctp_send_asconf_ack(stcb);
3419                 break;
3420         case SCTP_FORWARD_CUM_TSN:
3421                 send_forward_tsn(stcb, &stcb->asoc);
3422                 break;
3423                 /* can't do anything with these */
3424         case SCTP_PACKET_DROPPED:
3425         case SCTP_INITIATION_ACK:       /* this should not happen */
3426         case SCTP_HEARTBEAT_ACK:
3427         case SCTP_ABORT_ASSOCIATION:
3428         case SCTP_OPERATION_ERROR:
3429         case SCTP_SHUTDOWN_COMPLETE:
3430         case SCTP_ECN_ECHO:
3431         case SCTP_ECN_CWR:
3432         default:
3433                 break;
3434         }
3435         return (0);
3436 }
3437
3438 void
3439 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3440 {
3441         uint32_t i;
3442         uint16_t temp;
3443
3444         /*
3445          * We set things to 0xffff since this is the last delivered sequence
3446          * and we will be sending in 0 after the reset.
3447          */
3448
3449         if (number_entries) {
3450                 for (i = 0; i < number_entries; i++) {
3451                         temp = ntohs(list[i]);
3452                         if (temp >= stcb->asoc.streamincnt) {
3453                                 continue;
3454                         }
3455                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3456                 }
3457         } else {
3458                 list = NULL;
3459                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3460                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3461                 }
3462         }
3463         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3464 }
3465
3466 static void
3467 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3468 {
3469         uint32_t i;
3470         uint16_t temp;
3471
3472         if (number_entries > 0) {
3473                 for (i = 0; i < number_entries; i++) {
3474                         temp = ntohs(list[i]);
3475                         if (temp >= stcb->asoc.streamoutcnt) {
3476                                 /* no such stream */
3477                                 continue;
3478                         }
3479                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3480                 }
3481         } else {
3482                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3483                         stcb->asoc.strmout[i].next_sequence_send = 0;
3484                 }
3485         }
3486         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3487 }
3488
3489
3490 struct sctp_stream_reset_request *
3491 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3492 {
3493         struct sctp_association *asoc;
3494         struct sctp_chunkhdr *ch;
3495         struct sctp_stream_reset_request *r;
3496         struct sctp_tmit_chunk *chk;
3497         int len, clen;
3498
3499         asoc = &stcb->asoc;
3500         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3501                 asoc->stream_reset_outstanding = 0;
3502                 return (NULL);
3503         }
3504         if (stcb->asoc.str_reset == NULL) {
3505                 asoc->stream_reset_outstanding = 0;
3506                 return (NULL);
3507         }
3508         chk = stcb->asoc.str_reset;
3509         if (chk->data == NULL) {
3510                 return (NULL);
3511         }
3512         if (bchk) {
3513                 /* he wants a copy of the chk pointer */
3514                 *bchk = chk;
3515         }
3516         clen = chk->send_size;
3517         ch = mtod(chk->data, struct sctp_chunkhdr *);
3518         r = (struct sctp_stream_reset_request *)(ch + 1);
3519         if (ntohl(r->request_seq) == seq) {
3520                 /* found it */
3521                 return (r);
3522         }
3523         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3524         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3525                 /* move to the next one, there can only be a max of two */
3526                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3527                 if (ntohl(r->request_seq) == seq) {
3528                         return (r);
3529                 }
3530         }
3531         /* that seq is not here */
3532         return (NULL);
3533 }
3534
3535 static void
3536 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3537 {
3538         struct sctp_association *asoc;
3539         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3540
3541         if (stcb->asoc.str_reset == NULL) {
3542                 return;
3543         }
3544         asoc = &stcb->asoc;
3545
3546         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3547         TAILQ_REMOVE(&asoc->control_send_queue,
3548             chk,
3549             sctp_next);
3550         if (chk->data) {
3551                 sctp_m_freem(chk->data);
3552                 chk->data = NULL;
3553         }
3554         asoc->ctrl_queue_cnt--;
3555         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3556         /* sa_ignore NO_NULL_CHK */
3557         stcb->asoc.str_reset = NULL;
3558 }
3559
3560
3561 static int
3562 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3563     uint32_t seq, uint32_t action,
3564     struct sctp_stream_reset_response *respin)
3565 {
3566         uint16_t type;
3567         int lparm_len;
3568         struct sctp_association *asoc = &stcb->asoc;
3569         struct sctp_tmit_chunk *chk;
3570         struct sctp_stream_reset_request *req_param;
3571         struct sctp_stream_reset_out_request *req_out_param;
3572         struct sctp_stream_reset_in_request *req_in_param;
3573         uint32_t number_entries;
3574
3575         if (asoc->stream_reset_outstanding == 0) {
3576                 /* duplicate */
3577                 return (0);
3578         }
3579         if (seq == stcb->asoc.str_reset_seq_out) {
3580                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3581                 if (req_param != NULL) {
3582                         stcb->asoc.str_reset_seq_out++;
3583                         type = ntohs(req_param->ph.param_type);
3584                         lparm_len = ntohs(req_param->ph.param_length);
3585                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3586                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3587                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3588                                 asoc->stream_reset_out_is_outstanding = 0;
3589                                 if (asoc->stream_reset_outstanding)
3590                                         asoc->stream_reset_outstanding--;
3591                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3592                                         /* do it */
3593                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3594                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3595                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3596                                 } else {
3597                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3598                                 }
3599                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3600                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3601                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3602                                 if (asoc->stream_reset_outstanding)
3603                                         asoc->stream_reset_outstanding--;
3604                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3605                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3606                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3607                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3608                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3609                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3610                                 }
3611                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3612                                 /* Ok we now may have more streams */
3613                                 int num_stream;
3614
3615                                 num_stream = stcb->asoc.strm_pending_add_size;
3616                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3617                                         /* TSNH */
3618                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3619                                 }
3620                                 stcb->asoc.strm_pending_add_size = 0;
3621                                 if (asoc->stream_reset_outstanding)
3622                                         asoc->stream_reset_outstanding--;
3623                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3624                                         /* Put the new streams into effect */
3625                                         stcb->asoc.streamoutcnt += num_stream;
3626                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3627                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3628                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3629                                             SCTP_STREAM_CHANGE_DENIED);
3630                                 } else {
3631                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3632                                             SCTP_STREAM_CHANGE_FAILED);
3633                                 }
3634                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3635                                 if (asoc->stream_reset_outstanding)
3636                                         asoc->stream_reset_outstanding--;
3637                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3638                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3639                                             SCTP_STREAM_CHANGE_DENIED);
3640                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3641                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3642                                             SCTP_STREAM_CHANGE_FAILED);
3643                                 }
3644                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3645                                 /**
3646                                  * a) Adopt the new in tsn.
3647                                  * b) reset the map
3648                                  * c) Adopt the new out-tsn
3649                                  */
3650                                 struct sctp_stream_reset_response_tsn *resp;
3651                                 struct sctp_forward_tsn_chunk fwdtsn;
3652                                 int abort_flag = 0;
3653
3654                                 if (respin == NULL) {
3655                                         /* huh ? */
3656                                         return (0);
3657                                 }
3658                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3659                                         return (0);
3660                                 }
3661                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3662                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3663                                         asoc->stream_reset_outstanding--;
3664                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3665                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3666                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3667                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3668                                         if (abort_flag) {
3669                                                 return (1);
3670                                         }
3671                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3672                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3673                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3674                                         }
3675                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3676                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3677                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3678
3679                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3680                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3681
3682                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3683                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3684
3685                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3686                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3687                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3688                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3689                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3690                                             SCTP_ASSOC_RESET_DENIED);
3691                                 } else {
3692                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3693                                             SCTP_ASSOC_RESET_FAILED);
3694                                 }
3695                         }
3696                         /* get rid of the request and get the request flags */
3697                         if (asoc->stream_reset_outstanding == 0) {
3698                                 sctp_clean_up_stream_reset(stcb);
3699                         }
3700                 }
3701         }
3702         return (0);
3703 }
3704
3705 static void
3706 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3707     struct sctp_tmit_chunk *chk,
3708     struct sctp_stream_reset_in_request *req, int trunc)
3709 {
3710         uint32_t seq;
3711         int len, i;
3712         int number_entries;
3713         uint16_t temp;
3714
3715         /*
3716          * peer wants me to send a str-reset to him for my outgoing seq's if
3717          * seq_in is right.
3718          */
3719         struct sctp_association *asoc = &stcb->asoc;
3720
3721         seq = ntohl(req->request_seq);
3722         if (asoc->str_reset_seq_in == seq) {
3723                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3724                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3725                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3726                 } else if (trunc) {
3727                         /* Can't do it, since they exceeded our buffer size  */
3728                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3729                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3730                         len = ntohs(req->ph.param_length);
3731                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3732                         for (i = 0; i < number_entries; i++) {
3733                                 temp = ntohs(req->list_of_streams[i]);
3734                                 req->list_of_streams[i] = temp;
3735                         }
3736                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3737                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3738                             asoc->str_reset_seq_out,
3739                             seq, (asoc->sending_seq - 1));
3740                         asoc->stream_reset_out_is_outstanding = 1;
3741                         asoc->str_reset = chk;
3742                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3743                         stcb->asoc.stream_reset_outstanding++;
3744                 } else {
3745                         /* Can't do it, since we have sent one out */
3746                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3747                 }
3748                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3749                 asoc->str_reset_seq_in++;
3750         } else if (asoc->str_reset_seq_in - 1 == seq) {
3751                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3752         } else if (asoc->str_reset_seq_in - 2 == seq) {
3753                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3754         } else {
3755                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3756         }
3757 }
3758
3759 static int
3760 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3761     struct sctp_tmit_chunk *chk,
3762     struct sctp_stream_reset_tsn_request *req)
3763 {
3764         /* reset all in and out and update the tsn */
3765         /*
3766          * A) reset my str-seq's on in and out. B) Select a receive next,
3767          * and set cum-ack to it. Also process this selected number as a
3768          * fwd-tsn as well. C) set in the response my next sending seq.
3769          */
3770         struct sctp_forward_tsn_chunk fwdtsn;
3771         struct sctp_association *asoc = &stcb->asoc;
3772         int abort_flag = 0;
3773         uint32_t seq;
3774
3775         seq = ntohl(req->request_seq);
3776         if (asoc->str_reset_seq_in == seq) {
3777                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3778                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3779                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3780                 } else {
3781                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3782                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3783                         fwdtsn.ch.chunk_flags = 0;
3784                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3785                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3786                         if (abort_flag) {
3787                                 return (1);
3788                         }
3789                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3790                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3791                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3792                         }
3793                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3794                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3795                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3796                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3797                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3798                         atomic_add_int(&asoc->sending_seq, 1);
3799                         /* save off historical data for retrans */
3800                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3801                         asoc->last_sending_seq[0] = asoc->sending_seq;
3802                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3803                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3804                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3805                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3806                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3807                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3808                 }
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                 asoc->str_reset_seq_in++;
3812         } else if (asoc->str_reset_seq_in - 1 == seq) {
3813                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3814                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3815         } else if (asoc->str_reset_seq_in - 2 == seq) {
3816                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3817                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3818         } else {
3819                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3820         }
3821         return (0);
3822 }
3823
3824 static void
3825 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3826     struct sctp_tmit_chunk *chk,
3827     struct sctp_stream_reset_out_request *req, int trunc)
3828 {
3829         uint32_t seq, tsn;
3830         int number_entries, len;
3831         struct sctp_association *asoc = &stcb->asoc;
3832
3833         seq = ntohl(req->request_seq);
3834
3835         /* now if its not a duplicate we process it */
3836         if (asoc->str_reset_seq_in == seq) {
3837                 len = ntohs(req->ph.param_length);
3838                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3839                 /*
3840                  * the sender is resetting, handle the list issue.. we must
3841                  * a) verify if we can do the reset, if so no problem b) If
3842                  * we can't do the reset we must copy the request. c) queue
3843                  * it, and setup the data in processor to trigger it off
3844                  * when needed and dequeue all the queued data.
3845                  */
3846                 tsn = ntohl(req->send_reset_at_tsn);
3847
3848                 /* move the reset action back one */
3849                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3850                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3851                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3852                 } else if (trunc) {
3853                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3854                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3855                         /* we can do it now */
3856                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3857                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3858                 } else {
3859                         /*
3860                          * we must queue it up and thus wait for the TSN's
3861                          * to arrive that are at or before tsn
3862                          */
3863                         struct sctp_stream_reset_list *liste;
3864                         int siz;
3865
3866                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3867                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3868                             siz, SCTP_M_STRESET);
3869                         if (liste == NULL) {
3870                                 /* gak out of memory */
3871                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3872                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3873                                 return;
3874                         }
3875                         liste->tsn = tsn;
3876                         liste->number_entries = number_entries;
3877                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3878                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3879                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3880                 }
3881                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3882                 asoc->str_reset_seq_in++;
3883         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3884                 /*
3885                  * one seq back, just echo back last action since my
3886                  * response was lost.
3887                  */
3888                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3889         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3890                 /*
3891                  * two seq back, just echo back last action since my
3892                  * response was lost.
3893                  */
3894                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3895         } else {
3896                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3897         }
3898 }
3899
3900 static void
3901 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3902     struct sctp_stream_reset_add_strm *str_add)
3903 {
3904         /*
3905          * Peer is requesting to add more streams. If its within our
3906          * max-streams we will allow it.
3907          */
3908         uint32_t num_stream, i;
3909         uint32_t seq;
3910         struct sctp_association *asoc = &stcb->asoc;
3911         struct sctp_queued_to_read *ctl, *nctl;
3912
3913         /* Get the number. */
3914         seq = ntohl(str_add->request_seq);
3915         num_stream = ntohs(str_add->number_of_streams);
3916         /* Now what would be the new total? */
3917         if (asoc->str_reset_seq_in == seq) {
3918                 num_stream += stcb->asoc.streamincnt;
3919                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3920                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3921                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3922                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3923                     (num_stream > 0xffff)) {
3924                         /* We must reject it they ask for to many */
3925         denied:
3926                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3927                 } else {
3928                         /* Ok, we can do that :-) */
3929                         struct sctp_stream_in *oldstrm;
3930
3931                         /* save off the old */
3932                         oldstrm = stcb->asoc.strmin;
3933                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3934                             (num_stream * sizeof(struct sctp_stream_in)),
3935                             SCTP_M_STRMI);
3936                         if (stcb->asoc.strmin == NULL) {
3937                                 stcb->asoc.strmin = oldstrm;
3938                                 goto denied;
3939                         }
3940                         /* copy off the old data */
3941                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3942                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3943                                 stcb->asoc.strmin[i].stream_no = i;
3944                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3945                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3946                                 /* now anything on those queues? */
3947                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3948                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3949                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3950                                 }
3951                         }
3952                         /* Init the new streams */
3953                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3954                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3955                                 stcb->asoc.strmin[i].stream_no = i;
3956                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3957                                 stcb->asoc.strmin[i].delivery_started = 0;
3958                         }
3959                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3960                         /* update the size */
3961                         stcb->asoc.streamincnt = num_stream;
3962                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3963                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3964                 }
3965                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3966                 asoc->str_reset_seq_in++;
3967         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3968                 /*
3969                  * one seq back, just echo back last action since my
3970                  * response was lost.
3971                  */
3972                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3973         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3974                 /*
3975                  * two seq back, just echo back last action since my
3976                  * response was lost.
3977                  */
3978                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3979         } else {
3980                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3981
3982         }
3983 }
3984
3985 static void
3986 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3987     struct sctp_stream_reset_add_strm *str_add)
3988 {
3989         /*
3990          * Peer is requesting to add more streams. If its within our
3991          * max-streams we will allow it.
3992          */
3993         uint16_t num_stream;
3994         uint32_t seq;
3995         struct sctp_association *asoc = &stcb->asoc;
3996
3997         /* Get the number. */
3998         seq = ntohl(str_add->request_seq);
3999         num_stream = ntohs(str_add->number_of_streams);
4000         /* Now what would be the new total? */
4001         if (asoc->str_reset_seq_in == seq) {
4002                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4003                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4004                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4005                 } else if (stcb->asoc.stream_reset_outstanding) {
4006                         /* We must reject it we have something pending */
4007                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4008                 } else {
4009                         /* Ok, we can do that :-) */
4010                         int mychk;
4011
4012                         mychk = stcb->asoc.streamoutcnt;
4013                         mychk += num_stream;
4014                         if (mychk < 0x10000) {
4015                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4016                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4017                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4018                                 }
4019                         } else {
4020                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4021                         }
4022                 }
4023                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4024                 asoc->str_reset_seq_in++;
4025         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4026                 /*
4027                  * one seq back, just echo back last action since my
4028                  * response was lost.
4029                  */
4030                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4031         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4032                 /*
4033                  * two seq back, just echo back last action since my
4034                  * response was lost.
4035                  */
4036                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4037         } else {
4038                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4039         }
4040 }
4041
4042 #ifdef __GNUC__
4043 __attribute__((noinline))
4044 #endif
4045         static int
4046             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4047         struct sctp_chunkhdr *ch_req)
4048 {
4049         uint16_t remaining_length, param_len, ptype;
4050         struct sctp_paramhdr pstore;
4051         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4052         uint32_t seq = 0;
4053         int num_req = 0;
4054         int trunc = 0;
4055         struct sctp_tmit_chunk *chk;
4056         struct sctp_chunkhdr *ch;
4057         struct sctp_paramhdr *ph;
4058         int ret_code = 0;
4059         int num_param = 0;
4060
4061         /* now it may be a reset or a reset-response */
4062         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4063
4064         /* setup for adding the response */
4065         sctp_alloc_a_chunk(stcb, chk);
4066         if (chk == NULL) {
4067                 return (ret_code);
4068         }
4069         chk->copy_by_ref = 0;
4070         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4071         chk->rec.chunk_id.can_take_data = 0;
4072         chk->flags = 0;
4073         chk->asoc = &stcb->asoc;
4074         chk->no_fr_allowed = 0;
4075         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4076         chk->book_size_scale = 0;
4077         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4078         if (chk->data == NULL) {
4079 strres_nochunk:
4080                 if (chk->data) {
4081                         sctp_m_freem(chk->data);
4082                         chk->data = NULL;
4083                 }
4084                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4085                 return (ret_code);
4086         }
4087         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4088
4089         /* setup chunk parameters */
4090         chk->sent = SCTP_DATAGRAM_UNSENT;
4091         chk->snd_count = 0;
4092         chk->whoTo = NULL;
4093
4094         ch = mtod(chk->data, struct sctp_chunkhdr *);
4095         ch->chunk_type = SCTP_STREAM_RESET;
4096         ch->chunk_flags = 0;
4097         ch->chunk_length = htons(chk->send_size);
4098         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4099         offset += sizeof(struct sctp_chunkhdr);
4100         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4101                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4102                 if (ph == NULL) {
4103                         /* TSNH */
4104                         break;
4105                 }
4106                 param_len = ntohs(ph->param_length);
4107                 if ((param_len > remaining_length) ||
4108                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4109                         /* bad parameter length */
4110                         break;
4111                 }
4112                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4113                     (uint8_t *) & cstore);
4114                 if (ph == NULL) {
4115                         /* TSNH */
4116                         break;
4117                 }
4118                 ptype = ntohs(ph->param_type);
4119                 num_param++;
4120                 if (param_len > sizeof(cstore)) {
4121                         trunc = 1;
4122                 } else {
4123                         trunc = 0;
4124                 }
4125                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4126                         /* hit the max of parameters already sorry.. */
4127                         break;
4128                 }
4129                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4130                         struct sctp_stream_reset_out_request *req_out;
4131
4132                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4133                                 break;
4134                         }
4135                         req_out = (struct sctp_stream_reset_out_request *)ph;
4136                         num_req++;
4137                         if (stcb->asoc.stream_reset_outstanding) {
4138                                 seq = ntohl(req_out->response_seq);
4139                                 if (seq == stcb->asoc.str_reset_seq_out) {
4140                                         /* implicit ack */
4141                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4142                                 }
4143                         }
4144                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4145                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4146                         struct sctp_stream_reset_add_strm *str_add;
4147
4148                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4149                                 break;
4150                         }
4151                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4152                         num_req++;
4153                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4154                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4155                         struct sctp_stream_reset_add_strm *str_add;
4156
4157                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4158                                 break;
4159                         }
4160                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4161                         num_req++;
4162                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4163                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4164                         struct sctp_stream_reset_in_request *req_in;
4165
4166                         num_req++;
4167                         req_in = (struct sctp_stream_reset_in_request *)ph;
4168                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4169                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4170                         struct sctp_stream_reset_tsn_request *req_tsn;
4171
4172                         num_req++;
4173                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4174                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4175                                 ret_code = 1;
4176                                 goto strres_nochunk;
4177                         }
4178                         /* no more */
4179                         break;
4180                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4181                         struct sctp_stream_reset_response *resp;
4182                         uint32_t result;
4183
4184                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4185                                 break;
4186                         }
4187                         resp = (struct sctp_stream_reset_response *)ph;
4188                         seq = ntohl(resp->response_seq);
4189                         result = ntohl(resp->result);
4190                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4191                                 ret_code = 1;
4192                                 goto strres_nochunk;
4193                         }
4194                 } else {
4195                         break;
4196                 }
4197                 offset += SCTP_SIZE32(param_len);
4198                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4199                         remaining_length -= SCTP_SIZE32(param_len);
4200                 } else {
4201                         remaining_length = 0;
4202                 }
4203         }
4204         if (num_req == 0) {
4205                 /* we have no response free the stuff */
4206                 goto strres_nochunk;
4207         }
4208         /* ok we have a chunk to link in */
4209         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4210             chk,
4211             sctp_next);
4212         stcb->asoc.ctrl_queue_cnt++;
4213         return (ret_code);
4214 }
4215
4216 /*
4217  * Handle a router or endpoints report of a packet loss, there are two ways
4218  * to handle this, either we get the whole packet and must disect it
4219  * ourselves (possibly with truncation and or corruption) or it is a summary
4220  * from a middle box that did the disectting for us.
4221  */
4222 static void
4223 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4224     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4225 {
4226         uint32_t bottle_bw, on_queue;
4227         uint16_t trunc_len;
4228         unsigned int chlen;
4229         unsigned int at;
4230         struct sctp_chunk_desc desc;
4231         struct sctp_chunkhdr *ch;
4232
4233         chlen = ntohs(cp->ch.chunk_length);
4234         chlen -= sizeof(struct sctp_pktdrop_chunk);
4235         /* XXX possible chlen underflow */
4236         if (chlen == 0) {
4237                 ch = NULL;
4238                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4239                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4240         } else {
4241                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4242                 chlen -= sizeof(struct sctphdr);
4243                 /* XXX possible chlen underflow */
4244                 memset(&desc, 0, sizeof(desc));
4245         }
4246         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4247         if (trunc_len > limit) {
4248                 trunc_len = limit;
4249         }
4250         /* now the chunks themselves */
4251         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4252                 desc.chunk_type = ch->chunk_type;
4253                 /* get amount we need to move */
4254                 at = ntohs(ch->chunk_length);
4255                 if (at < sizeof(struct sctp_chunkhdr)) {
4256                         /* corrupt chunk, maybe at the end? */
4257                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4258                         break;
4259                 }
4260                 if (trunc_len == 0) {
4261                         /* we are supposed to have all of it */
4262                         if (at > chlen) {
4263                                 /* corrupt skip it */
4264                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4265                                 break;
4266                         }
4267                 } else {
4268                         /* is there enough of it left ? */
4269                         if (desc.chunk_type == SCTP_DATA) {
4270                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4271                                     sizeof(desc.data_bytes))) {
4272                                         break;
4273                                 }
4274                         } else {
4275                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4276                                         break;
4277                                 }
4278                         }
4279                 }
4280                 if (desc.chunk_type == SCTP_DATA) {
4281                         /* can we get out the tsn? */
4282                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4283                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4284
4285                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4286                                 /* yep */
4287                                 struct sctp_data_chunk *dcp;
4288                                 uint8_t *ddp;
4289                                 unsigned int iii;
4290
4291                                 dcp = (struct sctp_data_chunk *)ch;
4292                                 ddp = (uint8_t *) (dcp + 1);
4293                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4294                                         desc.data_bytes[iii] = ddp[iii];
4295                                 }
4296                                 desc.tsn_ifany = dcp->dp.tsn;
4297                         } else {
4298                                 /* nope we are done. */
4299                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4300                                 break;
4301                         }
4302                 } else {
4303                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4304                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4305                 }
4306
4307                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4308                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4309                         break;
4310                 }
4311                 if (SCTP_SIZE32(at) > chlen) {
4312                         break;
4313                 }
4314                 chlen -= SCTP_SIZE32(at);
4315                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4316                         /* done, none left */
4317                         break;
4318                 }
4319                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4320         }
4321         /* Now update any rwnd --- possibly */
4322         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4323                 /* From a peer, we get a rwnd report */
4324                 uint32_t a_rwnd;
4325
4326                 SCTP_STAT_INCR(sctps_pdrpfehos);
4327
4328                 bottle_bw = ntohl(cp->bottle_bw);
4329                 on_queue = ntohl(cp->current_onq);
4330                 if (bottle_bw && on_queue) {
4331                         /* a rwnd report is in here */
4332                         if (bottle_bw > on_queue)
4333                                 a_rwnd = bottle_bw - on_queue;
4334                         else
4335                                 a_rwnd = 0;
4336
4337                         if (a_rwnd == 0)
4338                                 stcb->asoc.peers_rwnd = 0;
4339                         else {
4340                                 if (a_rwnd > stcb->asoc.total_flight) {
4341                                         stcb->asoc.peers_rwnd =
4342                                             a_rwnd - stcb->asoc.total_flight;
4343                                 } else {
4344                                         stcb->asoc.peers_rwnd = 0;
4345                                 }
4346                                 if (stcb->asoc.peers_rwnd <
4347                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4348                                         /* SWS sender side engages */
4349                                         stcb->asoc.peers_rwnd = 0;
4350                                 }
4351                         }
4352                 }
4353         } else {
4354                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4355         }
4356
4357         /* now middle boxes in sat networks get a cwnd bump */
4358         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4359             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4360             (stcb->asoc.sat_network)) {
4361                 /*
4362                  * This is debateable but for sat networks it makes sense
4363                  * Note if a T3 timer has went off, we will prohibit any
4364                  * changes to cwnd until we exit the t3 loss recovery.
4365                  */
4366                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4367                     net, cp, &bottle_bw, &on_queue);
4368         }
4369 }
4370
4371 /*
4372  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4373  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4374  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4375  * length of the complete packet outputs: - length: modified to remaining
4376  * length after control processing - netp: modified to new sctp_nets after
4377  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4378  * bad packet,...) otherwise return the tcb for this packet
4379  */
4380 #ifdef __GNUC__
4381 __attribute__((noinline))
4382 #endif
4383         static struct sctp_tcb *
4384                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4385              struct sockaddr *src, struct sockaddr *dst,
4386              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4387              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4388              uint8_t mflowtype, uint32_t mflowid,
4389              uint32_t vrf_id, uint16_t port)
4390 {
4391         struct sctp_association *asoc;
4392         struct mbuf *op_err;
4393         char msg[SCTP_DIAG_INFO_LEN];
4394         uint32_t vtag_in;
4395         int num_chunks = 0;     /* number of control chunks processed */
4396         uint32_t chk_length;
4397         int ret;
4398         int abort_no_unlock = 0;
4399         int ecne_seen = 0;
4400
4401         /*
4402          * How big should this be, and should it be alloc'd? Lets try the
4403          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4404          * until we get into jumbo grams and such..
4405          */
4406         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4407         struct sctp_tcb *locked_tcb = stcb;
4408         int got_auth = 0;
4409         uint32_t auth_offset = 0, auth_len = 0;
4410         int auth_skipped = 0;
4411         int asconf_cnt = 0;
4412
4413 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4414         struct socket *so;
4415
4416 #endif
4417
4418         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4419             iphlen, *offset, length, (void *)stcb);
4420
4421         /* validate chunk header length... */
4422         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4423                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4424                     ntohs(ch->chunk_length));
4425                 if (locked_tcb) {
4426                         SCTP_TCB_UNLOCK(locked_tcb);
4427                 }
4428                 return (NULL);
4429         }
4430         /*
4431          * validate the verification tag
4432          */
4433         vtag_in = ntohl(sh->v_tag);
4434
4435         if (locked_tcb) {
4436                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4437         }
4438         if (ch->chunk_type == SCTP_INITIATION) {
4439                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4440                     ntohs(ch->chunk_length), vtag_in);
4441                 if (vtag_in != 0) {
4442                         /* protocol error- silently discard... */
4443                         SCTP_STAT_INCR(sctps_badvtag);
4444                         if (locked_tcb) {
4445                                 SCTP_TCB_UNLOCK(locked_tcb);
4446                         }
4447                         return (NULL);
4448                 }
4449         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4450                 /*
4451                  * If there is no stcb, skip the AUTH chunk and process
4452                  * later after a stcb is found (to validate the lookup was
4453                  * valid.
4454                  */
4455                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4456                     (stcb == NULL) &&
4457                     (inp->auth_supported == 1)) {
4458                         /* save this chunk for later processing */
4459                         auth_skipped = 1;
4460                         auth_offset = *offset;
4461                         auth_len = ntohs(ch->chunk_length);
4462
4463                         /* (temporarily) move past this chunk */
4464                         *offset += SCTP_SIZE32(auth_len);
4465                         if (*offset >= length) {
4466                                 /* no more data left in the mbuf chain */
4467                                 *offset = length;
4468                                 if (locked_tcb) {
4469                                         SCTP_TCB_UNLOCK(locked_tcb);
4470                                 }
4471                                 return (NULL);
4472                         }
4473                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4474                             sizeof(struct sctp_chunkhdr), chunk_buf);
4475                 }
4476                 if (ch == NULL) {
4477                         /* Help */
4478                         *offset = length;
4479                         if (locked_tcb) {
4480                                 SCTP_TCB_UNLOCK(locked_tcb);
4481                         }
4482                         return (NULL);
4483                 }
4484                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4485                         goto process_control_chunks;
4486                 }
4487                 /*
4488                  * first check if it's an ASCONF with an unknown src addr we
4489                  * need to look inside to find the association
4490                  */
4491                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4492                         struct sctp_chunkhdr *asconf_ch = ch;
4493                         uint32_t asconf_offset = 0, asconf_len = 0;
4494
4495                         /* inp's refcount may be reduced */
4496                         SCTP_INP_INCR_REF(inp);
4497
4498                         asconf_offset = *offset;
4499                         do {
4500                                 asconf_len = ntohs(asconf_ch->chunk_length);
4501                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4502                                         break;
4503                                 stcb = sctp_findassociation_ep_asconf(m,
4504                                     *offset,
4505                                     dst,
4506                                     sh, &inp, netp, vrf_id);
4507                                 if (stcb != NULL)
4508                                         break;
4509                                 asconf_offset += SCTP_SIZE32(asconf_len);
4510                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4511                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4512                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4513                         if (stcb == NULL) {
4514                                 /*
4515                                  * reduce inp's refcount if not reduced in
4516                                  * sctp_findassociation_ep_asconf().
4517                                  */
4518                                 SCTP_INP_DECR_REF(inp);
4519                         } else {
4520                                 locked_tcb = stcb;
4521                         }
4522
4523                         /* now go back and verify any auth chunk to be sure */
4524                         if (auth_skipped && (stcb != NULL)) {
4525                                 struct sctp_auth_chunk *auth;
4526
4527                                 auth = (struct sctp_auth_chunk *)
4528                                     sctp_m_getptr(m, auth_offset,
4529                                     auth_len, chunk_buf);
4530                                 got_auth = 1;
4531                                 auth_skipped = 0;
4532                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4533                                     auth_offset)) {
4534                                         /* auth HMAC failed so dump it */
4535                                         *offset = length;
4536                                         if (locked_tcb) {
4537                                                 SCTP_TCB_UNLOCK(locked_tcb);
4538                                         }
4539                                         return (NULL);
4540                                 } else {
4541                                         /* remaining chunks are HMAC checked */
4542                                         stcb->asoc.authenticated = 1;
4543                                 }
4544                         }
4545                 }
4546                 if (stcb == NULL) {
4547                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4548                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4549                             msg);
4550                         /* no association, so it's out of the blue... */
4551                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4552                             mflowtype, mflowid,
4553                             vrf_id, port);
4554                         *offset = length;
4555                         if (locked_tcb) {
4556                                 SCTP_TCB_UNLOCK(locked_tcb);
4557                         }
4558                         return (NULL);
4559                 }
4560                 asoc = &stcb->asoc;
4561                 /* ABORT and SHUTDOWN can use either v_tag... */
4562                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4563                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4564                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4565                         /* Take the T-bit always into account. */
4566                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4567                             (vtag_in == asoc->my_vtag)) ||
4568                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4569                             (vtag_in == asoc->peer_vtag))) {
4570                                 /* this is valid */
4571                         } else {
4572                                 /* drop this packet... */
4573                                 SCTP_STAT_INCR(sctps_badvtag);
4574                                 if (locked_tcb) {
4575                                         SCTP_TCB_UNLOCK(locked_tcb);
4576                                 }
4577                                 return (NULL);
4578                         }
4579                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4580                         if (vtag_in != asoc->my_vtag) {
4581                                 /*
4582                                  * this could be a stale SHUTDOWN-ACK or the
4583                                  * peer never got the SHUTDOWN-COMPLETE and
4584                                  * is still hung; we have started a new asoc
4585                                  * but it won't complete until the shutdown
4586                                  * is completed
4587                                  */
4588                                 if (locked_tcb) {
4589                                         SCTP_TCB_UNLOCK(locked_tcb);
4590                                 }
4591                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4592                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4593                                     msg);
4594                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4595                                     sh, inp, op_err,
4596                                     mflowtype, mflowid,
4597                                     vrf_id, port);
4598                                 return (NULL);
4599                         }
4600                 } else {
4601                         /* for all other chunks, vtag must match */
4602                         if (vtag_in != asoc->my_vtag) {
4603                                 /* invalid vtag... */
4604                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4605                                     "invalid vtag: %xh, expect %xh\n",
4606                                     vtag_in, asoc->my_vtag);
4607                                 SCTP_STAT_INCR(sctps_badvtag);
4608                                 if (locked_tcb) {
4609                                         SCTP_TCB_UNLOCK(locked_tcb);
4610                                 }
4611                                 *offset = length;
4612                                 return (NULL);
4613                         }
4614                 }
4615         }                       /* end if !SCTP_COOKIE_ECHO */
4616         /*
4617          * process all control chunks...
4618          */
4619         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4620             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4621             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4622             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4623                 /* implied cookie-ack.. we must have lost the ack */
4624                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4625                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4626                             stcb->asoc.overall_error_count,
4627                             0,
4628                             SCTP_FROM_SCTP_INPUT,
4629                             __LINE__);
4630                 }
4631                 stcb->asoc.overall_error_count = 0;
4632                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4633                     *netp);
4634         }
4635 process_control_chunks:
4636         while (IS_SCTP_CONTROL(ch)) {
4637                 /* validate chunk length */
4638                 chk_length = ntohs(ch->chunk_length);
4639                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4640                     ch->chunk_type, chk_length);
4641                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4642                 if (chk_length < sizeof(*ch) ||
4643                     (*offset + (int)chk_length) > length) {
4644                         *offset = length;
4645                         if (locked_tcb) {
4646                                 SCTP_TCB_UNLOCK(locked_tcb);
4647                         }
4648                         return (NULL);
4649                 }
4650                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4651                 /*
4652                  * INIT-ACK only gets the init ack "header" portion only
4653                  * because we don't have to process the peer's COOKIE. All
4654                  * others get a complete chunk.
4655                  */
4656                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4657                     (ch->chunk_type == SCTP_INITIATION)) {
4658                         /* get an init-ack chunk */
4659                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4660                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4661                         if (ch == NULL) {
4662                                 *offset = length;
4663                                 if (locked_tcb) {
4664                                         SCTP_TCB_UNLOCK(locked_tcb);
4665                                 }
4666                                 return (NULL);
4667                         }
4668                 } else {
4669                         /* For cookies and all other chunks. */
4670                         if (chk_length > sizeof(chunk_buf)) {
4671                                 /*
4672                                  * use just the size of the chunk buffer so
4673                                  * the front part of our chunks fit in
4674                                  * contiguous space up to the chunk buffer
4675                                  * size (508 bytes). For chunks that need to
4676                                  * get more than that they must use the
4677                                  * sctp_m_getptr() function or other means
4678                                  * (e.g. know how to parse mbuf chains).
4679                                  * Cookies do this already.
4680                                  */
4681                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4682                                     (sizeof(chunk_buf) - 4),
4683                                     chunk_buf);
4684                                 if (ch == NULL) {
4685                                         *offset = length;
4686                                         if (locked_tcb) {
4687                                                 SCTP_TCB_UNLOCK(locked_tcb);
4688                                         }
4689                                         return (NULL);
4690                                 }
4691                         } else {
4692                                 /* We can fit it all */
4693                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4694                                     chk_length, chunk_buf);
4695                                 if (ch == NULL) {
4696                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4697                                         *offset = length;
4698                                         if (locked_tcb) {
4699                                                 SCTP_TCB_UNLOCK(locked_tcb);
4700                                         }
4701                                         return (NULL);
4702                                 }
4703                         }
4704                 }
4705                 num_chunks++;
4706                 /* Save off the last place we got a control from */
4707                 if (stcb != NULL) {
4708                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4709                                 /*
4710                                  * allow last_control to be NULL if
4711                                  * ASCONF... ASCONF processing will find the
4712                                  * right net later
4713                                  */
4714                                 if ((netp != NULL) && (*netp != NULL))
4715                                         stcb->asoc.last_control_chunk_from = *netp;
4716                         }
4717                 }
4718 #ifdef SCTP_AUDITING_ENABLED
4719                 sctp_audit_log(0xB0, ch->chunk_type);
4720 #endif
4721
4722                 /* check to see if this chunk required auth, but isn't */
4723                 if ((stcb != NULL) &&
4724                     (stcb->asoc.auth_supported == 1) &&
4725                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4726                     !stcb->asoc.authenticated) {
4727                         /* "silently" ignore */
4728                         SCTP_STAT_INCR(sctps_recvauthmissing);
4729                         goto next_chunk;
4730                 }
4731                 switch (ch->chunk_type) {
4732                 case SCTP_INITIATION:
4733                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4734                         /* The INIT chunk must be the only chunk. */
4735                         if ((num_chunks > 1) ||
4736                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4737                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4738                                     "INIT not the only chunk");
4739                                 sctp_abort_association(inp, stcb, m, iphlen,
4740                                     src, dst, sh, op_err,
4741                                     mflowtype, mflowid,
4742                                     vrf_id, port);
4743                                 *offset = length;
4744                                 return (NULL);
4745                         }
4746                         /* Honor our resource limit. */
4747                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4748                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4749                                 sctp_abort_association(inp, stcb, m, iphlen,
4750                                     src, dst, sh, op_err,
4751                                     mflowtype, mflowid,
4752                                     vrf_id, port);
4753                                 *offset = length;
4754                                 return (NULL);
4755                         }
4756                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4757                             (struct sctp_init_chunk *)ch, inp,
4758                             stcb, &abort_no_unlock,
4759                             mflowtype, mflowid,
4760                             vrf_id, port);
4761                         *offset = length;
4762                         if ((!abort_no_unlock) && (locked_tcb)) {
4763                                 SCTP_TCB_UNLOCK(locked_tcb);
4764                         }
4765                         return (NULL);
4766                         break;
4767                 case SCTP_PAD_CHUNK:
4768                         break;
4769                 case SCTP_INITIATION_ACK:
4770                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4771                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4772                                 /* We are not interested anymore */
4773                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4774                                         ;
4775                                 } else {
4776                                         if (locked_tcb != stcb) {
4777                                                 /* Very unlikely */
4778                                                 SCTP_TCB_UNLOCK(locked_tcb);
4779                                         }
4780                                         *offset = length;
4781                                         if (stcb) {
4782 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4783                                                 so = SCTP_INP_SO(inp);
4784                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4785                                                 SCTP_TCB_UNLOCK(stcb);
4786                                                 SCTP_SOCKET_LOCK(so, 1);
4787                                                 SCTP_TCB_LOCK(stcb);
4788                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4789 #endif
4790                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4791 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4792                                                 SCTP_SOCKET_UNLOCK(so, 1);
4793 #endif
4794                                         }
4795                                         return (NULL);
4796                                 }
4797                         }
4798                         /* The INIT-ACK chunk must be the only chunk. */
4799                         if ((num_chunks > 1) ||
4800                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4801                                 *offset = length;
4802                                 if (locked_tcb) {
4803                                         SCTP_TCB_UNLOCK(locked_tcb);
4804                                 }
4805                                 return (NULL);
4806                         }
4807                         if ((netp) && (*netp)) {
4808                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4809                                     src, dst, sh,
4810                                     (struct sctp_init_ack_chunk *)ch,
4811                                     stcb, *netp,
4812                                     &abort_no_unlock,
4813                                     mflowtype, mflowid,
4814                                     vrf_id);
4815                         } else {
4816                                 ret = -1;
4817                         }
4818                         *offset = length;
4819                         if (abort_no_unlock) {
4820                                 return (NULL);
4821                         }
4822                         /*
4823                          * Special case, I must call the output routine to
4824                          * get the cookie echoed
4825                          */
4826                         if ((stcb != NULL) && (ret == 0)) {
4827                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4828                         }
4829                         if (locked_tcb) {
4830                                 SCTP_TCB_UNLOCK(locked_tcb);
4831                         }
4832                         return (NULL);
4833                         break;
4834                 case SCTP_SELECTIVE_ACK:
4835                         {
4836                                 struct sctp_sack_chunk *sack;
4837                                 int abort_now = 0;
4838                                 uint32_t a_rwnd, cum_ack;
4839                                 uint16_t num_seg, num_dup;
4840                                 uint8_t flags;
4841                                 int offset_seg, offset_dup;
4842
4843                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4844                                 SCTP_STAT_INCR(sctps_recvsacks);
4845                                 if (stcb == NULL) {
4846                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4847                                         break;
4848                                 }
4849                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4850                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4851                                         break;
4852                                 }
4853                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4854                                         /*-
4855                                          * If we have sent a shutdown-ack, we will pay no
4856                                          * attention to a sack sent in to us since
4857                                          * we don't care anymore.
4858                                          */
4859                                         break;
4860                                 }
4861                                 sack = (struct sctp_sack_chunk *)ch;
4862                                 flags = ch->chunk_flags;
4863                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4864                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4865                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4866                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4867                                 if (sizeof(struct sctp_sack_chunk) +
4868                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4869                                     num_dup * sizeof(uint32_t) != chk_length) {
4870                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4871                                         break;
4872                                 }
4873                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4874                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4875                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4876                                     cum_ack, num_seg, a_rwnd);
4877                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4878                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4879                                     (num_seg == 0) &&
4880                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4881                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4882                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4883                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4884                                     ) {
4885                                         /*
4886                                          * We have a SIMPLE sack having no
4887                                          * prior segments and data on sent
4888                                          * queue to be acked.. Use the
4889                                          * faster path sack processing. We
4890                                          * also allow window update sacks
4891                                          * with no missing segments to go
4892                                          * this way too.
4893                                          */
4894                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4895                                 } else {
4896                                         if (netp && *netp)
4897                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4898                                                     num_seg, 0, num_dup, &abort_now, flags,
4899                                                     cum_ack, a_rwnd, ecne_seen);
4900                                 }
4901                                 if (abort_now) {
4902                                         /* ABORT signal from sack processing */
4903                                         *offset = length;
4904                                         return (NULL);
4905                                 }
4906                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4907                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4908                                     (stcb->asoc.stream_queue_cnt == 0)) {
4909                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4910                                 }
4911                         }
4912                         break;
4913                         /*
4914                          * EY - nr_sack:  If the received chunk is an
4915                          * nr_sack chunk
4916                          */
4917                 case SCTP_NR_SELECTIVE_ACK:
4918                         {
4919                                 struct sctp_nr_sack_chunk *nr_sack;
4920                                 int abort_now = 0;
4921                                 uint32_t a_rwnd, cum_ack;
4922                                 uint16_t num_seg, num_nr_seg, num_dup;
4923                                 uint8_t flags;
4924                                 int offset_seg, offset_dup;
4925
4926                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4927                                 SCTP_STAT_INCR(sctps_recvsacks);
4928                                 if (stcb == NULL) {
4929                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4930                                         break;
4931                                 }
4932                                 if (stcb->asoc.nrsack_supported == 0) {
4933                                         goto unknown_chunk;
4934                                 }
4935                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4936                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4937                                         break;
4938                                 }
4939                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4940                                         /*-
4941                                          * If we have sent a shutdown-ack, we will pay no
4942                                          * attention to a sack sent in to us since
4943                                          * we don't care anymore.
4944                                          */
4945                                         break;
4946                                 }
4947                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4948                                 flags = ch->chunk_flags;
4949                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4950                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4951                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4952                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4953                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4954                                 if (sizeof(struct sctp_nr_sack_chunk) +
4955                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4956                                     num_dup * sizeof(uint32_t) != chk_length) {
4957                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4958                                         break;
4959                                 }
4960                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4961                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4962                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4963                                     cum_ack, num_seg, a_rwnd);
4964                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4965                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4966                                     (num_seg == 0) && (num_nr_seg == 0) &&
4967                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4968                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4969                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4970                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4971                                         /*
4972                                          * We have a SIMPLE sack having no
4973                                          * prior segments and data on sent
4974                                          * queue to be acked. Use the faster
4975                                          * path sack processing. We also
4976                                          * allow window update sacks with no
4977                                          * missing segments to go this way
4978                                          * too.
4979                                          */
4980                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4981                                             &abort_now, ecne_seen);
4982                                 } else {
4983                                         if (netp && *netp)
4984                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4985                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4986                                                     cum_ack, a_rwnd, ecne_seen);
4987                                 }
4988                                 if (abort_now) {
4989                                         /* ABORT signal from sack processing */
4990                                         *offset = length;
4991                                         return (NULL);
4992                                 }
4993                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4994                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4995                                     (stcb->asoc.stream_queue_cnt == 0)) {
4996                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4997                                 }
4998                         }
4999                         break;
5000
5001                 case SCTP_HEARTBEAT_REQUEST:
5002                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5003                         if ((stcb) && netp && *netp) {
5004                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5005                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5006                                     chk_length, *netp);
5007
5008                                 /* He's alive so give him credit */
5009                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5010                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5011                                             stcb->asoc.overall_error_count,
5012                                             0,
5013                                             SCTP_FROM_SCTP_INPUT,
5014                                             __LINE__);
5015                                 }
5016                                 stcb->asoc.overall_error_count = 0;
5017                         }
5018                         break;
5019                 case SCTP_HEARTBEAT_ACK:
5020                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5021                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5022                                 /* Its not ours */
5023                                 *offset = length;
5024                                 if (locked_tcb) {
5025                                         SCTP_TCB_UNLOCK(locked_tcb);
5026                                 }
5027                                 return (NULL);
5028                         }
5029                         /* He's alive so give him credit */
5030                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5031                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5032                                     stcb->asoc.overall_error_count,
5033                                     0,
5034                                     SCTP_FROM_SCTP_INPUT,
5035                                     __LINE__);
5036                         }
5037                         stcb->asoc.overall_error_count = 0;
5038                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5039                         if (netp && *netp)
5040                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5041                                     stcb, *netp);
5042                         break;
5043                 case SCTP_ABORT_ASSOCIATION:
5044                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5045                             (void *)stcb);
5046                         if ((stcb) && netp && *netp)
5047                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5048                                     stcb, *netp);
5049                         *offset = length;
5050                         return (NULL);
5051                         break;
5052                 case SCTP_SHUTDOWN:
5053                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5054                             (void *)stcb);
5055                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5056                                 *offset = length;
5057                                 if (locked_tcb) {
5058                                         SCTP_TCB_UNLOCK(locked_tcb);
5059                                 }
5060                                 return (NULL);
5061                         }
5062                         if (netp && *netp) {
5063                                 int abort_flag = 0;
5064
5065                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5066                                     stcb, *netp, &abort_flag);
5067                                 if (abort_flag) {
5068                                         *offset = length;
5069                                         return (NULL);
5070                                 }
5071                         }
5072                         break;
5073                 case SCTP_SHUTDOWN_ACK:
5074                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5075                         if ((stcb) && (netp) && (*netp))
5076                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5077                         *offset = length;
5078                         return (NULL);
5079                         break;
5080
5081                 case SCTP_OPERATION_ERROR:
5082                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5083                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5084                                 *offset = length;
5085                                 return (NULL);
5086                         }
5087                         break;
5088                 case SCTP_COOKIE_ECHO:
5089                         SCTPDBG(SCTP_DEBUG_INPUT3,
5090                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5091                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5092                                 ;
5093                         } else {
5094                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5095                                         /* We are not interested anymore */
5096                         abend:
5097                                         if (stcb) {
5098                                                 SCTP_TCB_UNLOCK(stcb);
5099                                         }
5100                                         *offset = length;
5101                                         return (NULL);
5102                                 }
5103                         }
5104                         /*
5105                          * First are we accepting? We do this again here
5106                          * since it is possible that a previous endpoint WAS
5107                          * listening responded to a INIT-ACK and then
5108                          * closed. We opened and bound.. and are now no
5109                          * longer listening.
5110                          */
5111
5112                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5113                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5114                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5115                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5116                                         sctp_abort_association(inp, stcb, m, iphlen,
5117                                             src, dst, sh, op_err,
5118                                             mflowtype, mflowid,
5119                                             vrf_id, port);
5120                                 }
5121                                 *offset = length;
5122                                 return (NULL);
5123                         } else {
5124                                 struct mbuf *ret_buf;
5125                                 struct sctp_inpcb *linp;
5126
5127                                 if (stcb) {
5128                                         linp = NULL;
5129                                 } else {
5130                                         linp = inp;
5131                                 }
5132
5133                                 if (linp) {
5134                                         SCTP_ASOC_CREATE_LOCK(linp);
5135                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5136                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5137                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5138                                                 goto abend;
5139                                         }
5140                                 }
5141                                 if (netp) {
5142                                         ret_buf =
5143                                             sctp_handle_cookie_echo(m, iphlen,
5144                                             *offset,
5145                                             src, dst,
5146                                             sh,
5147                                             (struct sctp_cookie_echo_chunk *)ch,
5148                                             &inp, &stcb, netp,
5149                                             auth_skipped,
5150                                             auth_offset,
5151                                             auth_len,
5152                                             &locked_tcb,
5153                                             mflowtype,
5154                                             mflowid,
5155                                             vrf_id,
5156                                             port);
5157                                 } else {
5158                                         ret_buf = NULL;
5159                                 }
5160                                 if (linp) {
5161                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5162                                 }
5163                                 if (ret_buf == NULL) {
5164                                         if (locked_tcb) {
5165                                                 SCTP_TCB_UNLOCK(locked_tcb);
5166                                         }
5167                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5168                                             "GAK, null buffer\n");
5169                                         *offset = length;
5170                                         return (NULL);
5171                                 }
5172                                 /* if AUTH skipped, see if it verified... */
5173                                 if (auth_skipped) {
5174                                         got_auth = 1;
5175                                         auth_skipped = 0;
5176                                 }
5177                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5178                                         /*
5179                                          * Restart the timer if we have
5180                                          * pending data
5181                                          */
5182                                         struct sctp_tmit_chunk *chk;
5183
5184                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5185                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5186                                 }
5187                         }
5188                         break;
5189                 case SCTP_COOKIE_ACK:
5190                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5191                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5192                                 if (locked_tcb) {
5193                                         SCTP_TCB_UNLOCK(locked_tcb);
5194                                 }
5195                                 return (NULL);
5196                         }
5197                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5198                                 /* We are not interested anymore */
5199                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5200                                         ;
5201                                 } else if (stcb) {
5202 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5203                                         so = SCTP_INP_SO(inp);
5204                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5205                                         SCTP_TCB_UNLOCK(stcb);
5206                                         SCTP_SOCKET_LOCK(so, 1);
5207                                         SCTP_TCB_LOCK(stcb);
5208                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5209 #endif
5210                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5211 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5212                                         SCTP_SOCKET_UNLOCK(so, 1);
5213 #endif
5214                                         *offset = length;
5215                                         return (NULL);
5216                                 }
5217                         }
5218                         /* He's alive so give him credit */
5219                         if ((stcb) && netp && *netp) {
5220                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5221                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5222                                             stcb->asoc.overall_error_count,
5223                                             0,
5224                                             SCTP_FROM_SCTP_INPUT,
5225                                             __LINE__);
5226                                 }
5227                                 stcb->asoc.overall_error_count = 0;
5228                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5229                         }
5230                         break;
5231                 case SCTP_ECN_ECHO:
5232                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5233                         /* He's alive so give him credit */
5234                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5235                                 /* Its not ours */
5236                                 if (locked_tcb) {
5237                                         SCTP_TCB_UNLOCK(locked_tcb);
5238                                 }
5239                                 *offset = length;
5240                                 return (NULL);
5241                         }
5242                         if (stcb) {
5243                                 if (stcb->asoc.ecn_supported == 0) {
5244                                         goto unknown_chunk;
5245                                 }
5246                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5247                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5248                                             stcb->asoc.overall_error_count,
5249                                             0,
5250                                             SCTP_FROM_SCTP_INPUT,
5251                                             __LINE__);
5252                                 }
5253                                 stcb->asoc.overall_error_count = 0;
5254                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5255                                     stcb);
5256                                 ecne_seen = 1;
5257                         }
5258                         break;
5259                 case SCTP_ECN_CWR:
5260                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5261                         /* He's alive so give him credit */
5262                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5263                                 /* Its not ours */
5264                                 if (locked_tcb) {
5265                                         SCTP_TCB_UNLOCK(locked_tcb);
5266                                 }
5267                                 *offset = length;
5268                                 return (NULL);
5269                         }
5270                         if (stcb) {
5271                                 if (stcb->asoc.ecn_supported == 0) {
5272                                         goto unknown_chunk;
5273                                 }
5274                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5275                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5276                                             stcb->asoc.overall_error_count,
5277                                             0,
5278                                             SCTP_FROM_SCTP_INPUT,
5279                                             __LINE__);
5280                                 }
5281                                 stcb->asoc.overall_error_count = 0;
5282                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5283                         }
5284                         break;
5285                 case SCTP_SHUTDOWN_COMPLETE:
5286                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5287                         /* must be first and only chunk */
5288                         if ((num_chunks > 1) ||
5289                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5290                                 *offset = length;
5291                                 if (locked_tcb) {
5292                                         SCTP_TCB_UNLOCK(locked_tcb);
5293                                 }
5294                                 return (NULL);
5295                         }
5296                         if ((stcb) && netp && *netp) {
5297                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5298                                     stcb, *netp);
5299                         }
5300                         *offset = length;
5301                         return (NULL);
5302                         break;
5303                 case SCTP_ASCONF:
5304                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5305                         /* He's alive so give him credit */
5306                         if (stcb) {
5307                                 if (stcb->asoc.asconf_supported == 0) {
5308                                         goto unknown_chunk;
5309                                 }
5310                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5311                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5312                                             stcb->asoc.overall_error_count,
5313                                             0,
5314                                             SCTP_FROM_SCTP_INPUT,
5315                                             __LINE__);
5316                                 }
5317                                 stcb->asoc.overall_error_count = 0;
5318                                 sctp_handle_asconf(m, *offset, src,
5319                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5320                                 asconf_cnt++;
5321                         }
5322                         break;
5323                 case SCTP_ASCONF_ACK:
5324                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5325                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5326                                 /* Its not ours */
5327                                 if (locked_tcb) {
5328                                         SCTP_TCB_UNLOCK(locked_tcb);
5329                                 }
5330                                 *offset = length;
5331                                 return (NULL);
5332                         }
5333                         if ((stcb) && netp && *netp) {
5334                                 if (stcb->asoc.asconf_supported == 0) {
5335                                         goto unknown_chunk;
5336                                 }
5337                                 /* He's alive so give him credit */
5338                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5339                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5340                                             stcb->asoc.overall_error_count,
5341                                             0,
5342                                             SCTP_FROM_SCTP_INPUT,
5343                                             __LINE__);
5344                                 }
5345                                 stcb->asoc.overall_error_count = 0;
5346                                 sctp_handle_asconf_ack(m, *offset,
5347                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5348                                 if (abort_no_unlock)
5349                                         return (NULL);
5350                         }
5351                         break;
5352                 case SCTP_FORWARD_CUM_TSN:
5353                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5354                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5355                                 /* Its not ours */
5356                                 if (locked_tcb) {
5357                                         SCTP_TCB_UNLOCK(locked_tcb);
5358                                 }
5359                                 *offset = length;
5360                                 return (NULL);
5361                         }
5362                         /* He's alive so give him credit */
5363                         if (stcb) {
5364                                 int abort_flag = 0;
5365
5366                                 if (stcb->asoc.prsctp_supported == 0) {
5367                                         goto unknown_chunk;
5368                                 }
5369                                 stcb->asoc.overall_error_count = 0;
5370                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5371                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5372                                             stcb->asoc.overall_error_count,
5373                                             0,
5374                                             SCTP_FROM_SCTP_INPUT,
5375                                             __LINE__);
5376                                 }
5377                                 *fwd_tsn_seen = 1;
5378                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5379                                         /* We are not interested anymore */
5380 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5381                                         so = SCTP_INP_SO(inp);
5382                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5383                                         SCTP_TCB_UNLOCK(stcb);
5384                                         SCTP_SOCKET_LOCK(so, 1);
5385                                         SCTP_TCB_LOCK(stcb);
5386                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5387 #endif
5388                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5389 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5390                                         SCTP_SOCKET_UNLOCK(so, 1);
5391 #endif
5392                                         *offset = length;
5393                                         return (NULL);
5394                                 }
5395                                 sctp_handle_forward_tsn(stcb,
5396                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5397                                 if (abort_flag) {
5398                                         *offset = length;
5399                                         return (NULL);
5400                                 } else {
5401                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5402                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5403                                                     stcb->asoc.overall_error_count,
5404                                                     0,
5405                                                     SCTP_FROM_SCTP_INPUT,
5406                                                     __LINE__);
5407                                         }
5408                                         stcb->asoc.overall_error_count = 0;
5409                                 }
5410
5411                         }
5412                         break;
5413                 case SCTP_STREAM_RESET:
5414                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5415                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5416                                 /* Its not ours */
5417                                 if (locked_tcb) {
5418                                         SCTP_TCB_UNLOCK(locked_tcb);
5419                                 }
5420                                 *offset = length;
5421                                 return (NULL);
5422                         }
5423                         if (stcb->asoc.reconfig_supported == 0) {
5424                                 goto unknown_chunk;
5425                         }
5426                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5427                                 /* stop processing */
5428                                 *offset = length;
5429                                 return (NULL);
5430                         }
5431                         break;
5432                 case SCTP_PACKET_DROPPED:
5433                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5434                         /* re-get it all please */
5435                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5436                                 /* Its not ours */
5437                                 if (locked_tcb) {
5438                                         SCTP_TCB_UNLOCK(locked_tcb);
5439                                 }
5440                                 *offset = length;
5441                                 return (NULL);
5442                         }
5443                         if (ch && (stcb) && netp && (*netp)) {
5444                                 if (stcb->asoc.pktdrop_supported == 0) {
5445                                         goto unknown_chunk;
5446                                 }
5447                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5448                                     stcb, *netp,
5449                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5450
5451                         }
5452                         break;
5453                 case SCTP_AUTHENTICATION:
5454                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5455                         if (stcb == NULL) {
5456                                 /* save the first AUTH for later processing */
5457                                 if (auth_skipped == 0) {
5458                                         auth_offset = *offset;
5459                                         auth_len = chk_length;
5460                                         auth_skipped = 1;
5461                                 }
5462                                 /* skip this chunk (temporarily) */
5463                                 goto next_chunk;
5464                         }
5465                         if (stcb->asoc.auth_supported == 0) {
5466                                 goto unknown_chunk;
5467                         }
5468                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5469                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5470                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5471                                 /* Its not ours */
5472                                 if (locked_tcb) {
5473                                         SCTP_TCB_UNLOCK(locked_tcb);
5474                                 }
5475                                 *offset = length;
5476                                 return (NULL);
5477                         }
5478                         if (got_auth == 1) {
5479                                 /* skip this chunk... it's already auth'd */
5480                                 goto next_chunk;
5481                         }
5482                         got_auth = 1;
5483                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5484                             m, *offset)) {
5485                                 /* auth HMAC failed so dump the packet */
5486                                 *offset = length;
5487                                 return (stcb);
5488                         } else {
5489                                 /* remaining chunks are HMAC checked */
5490                                 stcb->asoc.authenticated = 1;
5491                         }
5492                         break;
5493
5494                 default:
5495         unknown_chunk:
5496                         /* it's an unknown chunk! */
5497                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5498                                 struct mbuf *mm;
5499                                 struct sctp_paramhdr *phd;
5500                                 int len;
5501
5502                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5503                                     0, M_NOWAIT, 1, MT_DATA);
5504                                 if (mm) {
5505                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5506                                         phd = mtod(mm, struct sctp_paramhdr *);
5507                                         /*
5508                                          * We cheat and use param type since
5509                                          * we did not bother to define a
5510                                          * error cause struct. They are the
5511                                          * same basic format with different
5512                                          * names.
5513                                          */
5514                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5515                                         phd->param_length = htons(len + sizeof(*phd));
5516                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5517                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5518                                         if (SCTP_BUF_NEXT(mm)) {
5519                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) {
5520                                                         sctp_m_freem(mm);
5521                                                 } else {
5522 #ifdef SCTP_MBUF_LOGGING
5523                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5524                                                                 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY);
5525                                                         }
5526 #endif
5527                                                         sctp_queue_op_err(stcb, mm);
5528                                                 }
5529                                         } else {
5530                                                 sctp_m_freem(mm);
5531                                         }
5532                                 }
5533                         }
5534                         if ((ch->chunk_type & 0x80) == 0) {
5535                                 /* discard this packet */
5536                                 *offset = length;
5537                                 return (stcb);
5538                         }       /* else skip this bad chunk and continue... */
5539                         break;
5540                 }               /* switch (ch->chunk_type) */
5541
5542
5543 next_chunk:
5544                 /* get the next chunk */
5545                 *offset += SCTP_SIZE32(chk_length);
5546                 if (*offset >= length) {
5547                         /* no more data left in the mbuf chain */
5548                         break;
5549                 }
5550                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5551                     sizeof(struct sctp_chunkhdr), chunk_buf);
5552                 if (ch == NULL) {
5553                         if (locked_tcb) {
5554                                 SCTP_TCB_UNLOCK(locked_tcb);
5555                         }
5556                         *offset = length;
5557                         return (NULL);
5558                 }
5559         }                       /* while */
5560
5561         if (asconf_cnt > 0 && stcb != NULL) {
5562                 sctp_send_asconf_ack(stcb);
5563         }
5564         return (stcb);
5565 }
5566
5567
5568 #ifdef INVARIANTS
5569 #ifdef __GNUC__
5570 __attribute__((noinline))
5571 #endif
5572         void
5573              sctp_validate_no_locks(struct sctp_inpcb *inp)
5574 {
5575         struct sctp_tcb *lstcb;
5576
5577         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5578                 if (mtx_owned(&lstcb->tcb_mtx)) {
5579                         panic("Own lock on stcb at return from input");
5580                 }
5581         }
5582         if (mtx_owned(&inp->inp_create_mtx)) {
5583                 panic("Own create lock on inp");
5584         }
5585         if (mtx_owned(&inp->inp_mtx)) {
5586                 panic("Own inp lock on inp");
5587         }
5588 }
5589
5590 #endif
5591
5592 /*
5593  * common input chunk processing (v4 and v6)
5594  */
5595 void
5596 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5597     struct sockaddr *src, struct sockaddr *dst,
5598     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5599 #if !defined(SCTP_WITH_NO_CSUM)
5600     uint8_t compute_crc,
5601 #endif
5602     uint8_t ecn_bits,
5603     uint8_t mflowtype, uint32_t mflowid,
5604     uint32_t vrf_id, uint16_t port)
5605 {
5606         uint32_t high_tsn;
5607         int fwd_tsn_seen = 0, data_processed = 0;
5608         struct mbuf *m = *mm, *op_err;
5609         char msg[SCTP_DIAG_INFO_LEN];
5610         int un_sent;
5611         int cnt_ctrl_ready = 0;
5612         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5613         struct sctp_tcb *stcb = NULL;
5614         struct sctp_nets *net = NULL;
5615
5616         SCTP_STAT_INCR(sctps_recvdatagrams);
5617 #ifdef SCTP_AUDITING_ENABLED
5618         sctp_audit_log(0xE0, 1);
5619         sctp_auditing(0, inp, stcb, net);
5620 #endif
5621 #if !defined(SCTP_WITH_NO_CSUM)
5622         if (compute_crc != 0) {
5623                 uint32_t check, calc_check;
5624
5625                 check = sh->checksum;
5626                 sh->checksum = 0;
5627                 calc_check = sctp_calculate_cksum(m, iphlen);
5628                 sh->checksum = check;
5629                 if (calc_check != check) {
5630                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5631                             calc_check, check, (void *)m, length, iphlen);
5632                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5633                             sh, ch, &inp, &net, vrf_id);
5634 #if defined(INET) || defined(INET6)
5635                         if ((net != NULL) && (port != 0)) {
5636                                 if (net->port == 0) {
5637                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5638                                 }
5639                                 net->port = port;
5640                         }
5641 #endif
5642                         if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
5643                                 net->flowtype = mflowtype;
5644                         }
5645                         if ((inp != NULL) && (stcb != NULL)) {
5646                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5647                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5648                         } else if ((inp != NULL) && (stcb == NULL)) {
5649                                 inp_decr = inp;
5650                         }
5651                         SCTP_STAT_INCR(sctps_badsum);
5652                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5653                         goto out;
5654                 }
5655         }
5656 #endif
5657         /* Destination port of 0 is illegal, based on RFC4960. */
5658         if (sh->dest_port == 0) {
5659                 SCTP_STAT_INCR(sctps_hdrops);
5660                 goto out;
5661         }
5662         stcb = sctp_findassociation_addr(m, offset, src, dst,
5663             sh, ch, &inp, &net, vrf_id);
5664 #if defined(INET) || defined(INET6)
5665         if ((net != NULL) && (port != 0)) {
5666                 if (net->port == 0) {
5667                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5668                 }
5669                 net->port = port;
5670         }
5671 #endif
5672         if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
5673                 net->flowtype = mflowtype;
5674         }
5675         if (inp == NULL) {
5676                 SCTP_STAT_INCR(sctps_noport);
5677                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5678                         goto out;
5679                 }
5680                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5681                         sctp_send_shutdown_complete2(src, dst, sh,
5682                             mflowtype, mflowid,
5683                             vrf_id, port);
5684                         goto out;
5685                 }
5686                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5687                         goto out;
5688                 }
5689                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5690                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5691                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5692                             (ch->chunk_type != SCTP_INIT))) {
5693                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5694                                     "Out of the blue");
5695                                 sctp_send_abort(m, iphlen, src, dst,
5696                                     sh, 0, op_err,
5697                                     mflowtype, mflowid,
5698                                     vrf_id, port);
5699                         }
5700                 }
5701                 goto out;
5702         } else if (stcb == NULL) {
5703                 inp_decr = inp;
5704         }
5705 #ifdef IPSEC
5706         /*-
5707          * I very much doubt any of the IPSEC stuff will work but I have no
5708          * idea, so I will leave it in place.
5709          */
5710         if (inp != NULL) {
5711                 switch (dst->sa_family) {
5712 #ifdef INET
5713                 case AF_INET:
5714                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5715                                 IPSECSTAT_INC(ips_in_polvio);
5716                                 SCTP_STAT_INCR(sctps_hdrops);
5717                                 goto out;
5718                         }
5719                         break;
5720 #endif
5721 #ifdef INET6
5722                 case AF_INET6:
5723                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5724                                 IPSEC6STAT_INC(ips_in_polvio);
5725                                 SCTP_STAT_INCR(sctps_hdrops);
5726                                 goto out;
5727                         }
5728                         break;
5729 #endif
5730                 default:
5731                         break;
5732                 }
5733         }
5734 #endif
5735         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5736             (void *)m, iphlen, offset, length, (void *)stcb);
5737         if (stcb) {
5738                 /* always clear this before beginning a packet */
5739                 stcb->asoc.authenticated = 0;
5740                 stcb->asoc.seen_a_sack_this_pkt = 0;
5741                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5742                     (void *)stcb, stcb->asoc.state);
5743
5744                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5745                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5746                         /*-
5747                          * If we hit here, we had a ref count
5748                          * up when the assoc was aborted and the
5749                          * timer is clearing out the assoc, we should
5750                          * NOT respond to any packet.. its OOTB.
5751                          */
5752                         SCTP_TCB_UNLOCK(stcb);
5753                         stcb = NULL;
5754                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5755                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5756                             msg);
5757                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5758                             mflowtype, mflowid,
5759                             vrf_id, port);
5760                         goto out;
5761                 }
5762         }
5763         if (IS_SCTP_CONTROL(ch)) {
5764                 /* process the control portion of the SCTP packet */
5765                 /* sa_ignore NO_NULL_CHK */
5766                 stcb = sctp_process_control(m, iphlen, &offset, length,
5767                     src, dst, sh, ch,
5768                     inp, stcb, &net, &fwd_tsn_seen,
5769                     mflowtype, mflowid,
5770                     vrf_id, port);
5771                 if (stcb) {
5772                         /*
5773                          * This covers us if the cookie-echo was there and
5774                          * it changes our INP.
5775                          */
5776                         inp = stcb->sctp_ep;
5777 #if defined(INET) || defined(INET6)
5778                         if ((net) && (port)) {
5779                                 if (net->port == 0) {
5780                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5781                                 }
5782                                 net->port = port;
5783                         }
5784 #endif
5785                 }
5786         } else {
5787                 /*
5788                  * no control chunks, so pre-process DATA chunks (these
5789                  * checks are taken care of by control processing)
5790                  */
5791
5792                 /*
5793                  * if DATA only packet, and auth is required, then punt...
5794                  * can't have authenticated without any AUTH (control)
5795                  * chunks
5796                  */
5797                 if ((stcb != NULL) &&
5798                     (stcb->asoc.auth_supported == 1) &&
5799                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5800                         /* "silently" ignore */
5801                         SCTP_STAT_INCR(sctps_recvauthmissing);
5802                         goto out;
5803                 }
5804                 if (stcb == NULL) {
5805                         /* out of the blue DATA chunk */
5806                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5807                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5808                             msg);
5809                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5810                             mflowtype, mflowid,
5811                             vrf_id, port);
5812                         goto out;
5813                 }
5814                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5815                         /* v_tag mismatch! */
5816                         SCTP_STAT_INCR(sctps_badvtag);
5817                         goto out;
5818                 }
5819         }
5820
5821         if (stcb == NULL) {
5822                 /*
5823                  * no valid TCB for this packet, or we found it's a bad
5824                  * packet while processing control, or we're done with this
5825                  * packet (done or skip rest of data), so we drop it...
5826                  */
5827                 goto out;
5828         }
5829         /*
5830          * DATA chunk processing
5831          */
5832         /* plow through the data chunks while length > offset */
5833
5834         /*
5835          * Rest should be DATA only.  Check authentication state if AUTH for
5836          * DATA is required.
5837          */
5838         if ((length > offset) &&
5839             (stcb != NULL) &&
5840             (stcb->asoc.auth_supported == 1) &&
5841             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5842             !stcb->asoc.authenticated) {
5843                 /* "silently" ignore */
5844                 SCTP_STAT_INCR(sctps_recvauthmissing);
5845                 SCTPDBG(SCTP_DEBUG_AUTH1,
5846                     "Data chunk requires AUTH, skipped\n");
5847                 goto trigger_send;
5848         }
5849         if (length > offset) {
5850                 int retval;
5851
5852                 /*
5853                  * First check to make sure our state is correct. We would
5854                  * not get here unless we really did have a tag, so we don't
5855                  * abort if this happens, just dump the chunk silently.
5856                  */
5857                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5858                 case SCTP_STATE_COOKIE_ECHOED:
5859                         /*
5860                          * we consider data with valid tags in this state
5861                          * shows us the cookie-ack was lost. Imply it was
5862                          * there.
5863                          */
5864                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5865                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5866                                     stcb->asoc.overall_error_count,
5867                                     0,
5868                                     SCTP_FROM_SCTP_INPUT,
5869                                     __LINE__);
5870                         }
5871                         stcb->asoc.overall_error_count = 0;
5872                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5873                         break;
5874                 case SCTP_STATE_COOKIE_WAIT:
5875                         /*
5876                          * We consider OOTB any data sent during asoc setup.
5877                          */
5878                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5879                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5880                             msg);
5881                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5882                             mflowtype, mflowid,
5883                             vrf_id, port);
5884                         goto out;
5885                         /* sa_ignore NOTREACHED */
5886                         break;
5887                 case SCTP_STATE_EMPTY:  /* should not happen */
5888                 case SCTP_STATE_INUSE:  /* should not happen */
5889                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5890                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5891                 default:
5892                         goto out;
5893                         /* sa_ignore NOTREACHED */
5894                         break;
5895                 case SCTP_STATE_OPEN:
5896                 case SCTP_STATE_SHUTDOWN_SENT:
5897                         break;
5898                 }
5899                 /* plow through the data chunks while length > offset */
5900                 retval = sctp_process_data(mm, iphlen, &offset, length,
5901                     src, dst, sh,
5902                     inp, stcb, net, &high_tsn,
5903                     mflowtype, mflowid,
5904                     vrf_id, port);
5905                 if (retval == 2) {
5906                         /*
5907                          * The association aborted, NO UNLOCK needed since
5908                          * the association is destroyed.
5909                          */
5910                         stcb = NULL;
5911                         goto out;
5912                 }
5913                 data_processed = 1;
5914                 /*
5915                  * Anything important needs to have been m_copy'ed in
5916                  * process_data
5917                  */
5918         }
5919         /* take care of ecn */
5920         if ((data_processed == 1) &&
5921             (stcb->asoc.ecn_supported == 1) &&
5922             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5923                 /* Yep, we need to add a ECNE */
5924                 sctp_send_ecn_echo(stcb, net, high_tsn);
5925         }
5926         if ((data_processed == 0) && (fwd_tsn_seen)) {
5927                 int was_a_gap;
5928                 uint32_t highest_tsn;
5929
5930                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5931                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5932                 } else {
5933                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5934                 }
5935                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5936                 stcb->asoc.send_sack = 1;
5937                 sctp_sack_check(stcb, was_a_gap);
5938         } else if (fwd_tsn_seen) {
5939                 stcb->asoc.send_sack = 1;
5940         }
5941         /* trigger send of any chunks in queue... */
5942 trigger_send:
5943 #ifdef SCTP_AUDITING_ENABLED
5944         sctp_audit_log(0xE0, 2);
5945         sctp_auditing(1, inp, stcb, net);
5946 #endif
5947         SCTPDBG(SCTP_DEBUG_INPUT1,
5948             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5949             stcb->asoc.peers_rwnd,
5950             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5951             stcb->asoc.total_flight);
5952         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5953         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5954                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5955         }
5956         if (cnt_ctrl_ready ||
5957             ((un_sent) &&
5958             (stcb->asoc.peers_rwnd > 0 ||
5959             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5960                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5961                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5962                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5963         }
5964 #ifdef SCTP_AUDITING_ENABLED
5965         sctp_audit_log(0xE0, 3);
5966         sctp_auditing(2, inp, stcb, net);
5967 #endif
5968 out:
5969         if (stcb != NULL) {
5970                 SCTP_TCB_UNLOCK(stcb);
5971         }
5972         if (inp_decr != NULL) {
5973                 /* reduce ref-count */
5974                 SCTP_INP_WLOCK(inp_decr);
5975                 SCTP_INP_DECR_REF(inp_decr);
5976                 SCTP_INP_WUNLOCK(inp_decr);
5977         }
5978 #ifdef INVARIANTS
5979         if (inp != NULL) {
5980                 sctp_validate_no_locks(inp);
5981         }
5982 #endif
5983         return;
5984 }
5985
5986 #if 0
5987 static void
5988 sctp_print_mbuf_chain(struct mbuf *m)
5989 {
5990         for (; m; m = SCTP_BUF_NEXT(m)) {
5991                 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
5992                 if (SCTP_BUF_IS_EXTENDED(m))
5993                         SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
5994         }
5995 }
5996
5997 #endif
5998
5999 #ifdef INET
6000 void
6001 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6002 {
6003         struct mbuf *m;
6004         int iphlen;
6005         uint32_t vrf_id = 0;
6006         uint8_t ecn_bits;
6007         struct sockaddr_in src, dst;
6008         struct ip *ip;
6009         struct sctphdr *sh;
6010         struct sctp_chunkhdr *ch;
6011         int length, offset;
6012
6013 #if !defined(SCTP_WITH_NO_CSUM)
6014         uint8_t compute_crc;
6015
6016 #endif
6017         uint32_t mflowid;
6018         uint8_t mflowtype;
6019
6020         iphlen = off;
6021         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6022                 SCTP_RELEASE_PKT(i_pak);
6023                 return;
6024         }
6025         m = SCTP_HEADER_TO_CHAIN(i_pak);
6026 #ifdef SCTP_MBUF_LOGGING
6027         /* Log in any input mbufs */
6028         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6029                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6030         }
6031 #endif
6032 #ifdef SCTP_PACKET_LOGGING
6033         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6034                 sctp_packet_log(m);
6035         }
6036 #endif
6037         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6038             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6039             m->m_pkthdr.len,
6040             if_name(m->m_pkthdr.rcvif),
6041             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6042         mflowid = m->m_pkthdr.flowid;
6043         mflowtype = M_HASHTYPE_GET(m);
6044         SCTP_STAT_INCR(sctps_recvpackets);
6045         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6046         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6047         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6048         if (SCTP_BUF_LEN(m) < offset) {
6049                 if ((m = m_pullup(m, offset)) == NULL) {
6050                         SCTP_STAT_INCR(sctps_hdrops);
6051                         return;
6052                 }
6053         }
6054         ip = mtod(m, struct ip *);
6055         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6056         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6057         offset -= sizeof(struct sctp_chunkhdr);
6058         memset(&src, 0, sizeof(struct sockaddr_in));
6059         src.sin_family = AF_INET;
6060         src.sin_len = sizeof(struct sockaddr_in);
6061         src.sin_port = sh->src_port;
6062         src.sin_addr = ip->ip_src;
6063         memset(&dst, 0, sizeof(struct sockaddr_in));
6064         dst.sin_family = AF_INET;
6065         dst.sin_len = sizeof(struct sockaddr_in);
6066         dst.sin_port = sh->dest_port;
6067         dst.sin_addr = ip->ip_dst;
6068         length = ntohs(ip->ip_len);
6069         /* Validate mbuf chain length with IP payload length. */
6070         if (SCTP_HEADER_LEN(m) != length) {
6071                 SCTPDBG(SCTP_DEBUG_INPUT1,
6072                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6073                 SCTP_STAT_INCR(sctps_hdrops);
6074                 goto out;
6075         }
6076         /* SCTP does not allow broadcasts or multicasts */
6077         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6078                 goto out;
6079         }
6080         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6081                 goto out;
6082         }
6083         ecn_bits = ip->ip_tos;
6084 #if defined(SCTP_WITH_NO_CSUM)
6085         SCTP_STAT_INCR(sctps_recvnocrc);
6086 #else
6087         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6088                 SCTP_STAT_INCR(sctps_recvhwcrc);
6089                 compute_crc = 0;
6090         } else {
6091                 SCTP_STAT_INCR(sctps_recvswcrc);
6092                 compute_crc = 1;
6093         }
6094 #endif
6095         sctp_common_input_processing(&m, iphlen, offset, length,
6096             (struct sockaddr *)&src,
6097             (struct sockaddr *)&dst,
6098             sh, ch,
6099 #if !defined(SCTP_WITH_NO_CSUM)
6100             compute_crc,
6101 #endif
6102             ecn_bits,
6103             mflowtype, mflowid,
6104             vrf_id, port);
6105 out:
6106         if (m) {
6107                 sctp_m_freem(m);
6108         }
6109         return;
6110 }
6111
6112 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6113 extern int *sctp_cpuarry;
6114
6115 #endif
6116
6117 void
6118 sctp_input(struct mbuf *m, int off)
6119 {
6120 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6121         struct ip *ip;
6122         struct sctphdr *sh;
6123         int offset;
6124         int cpu_to_use;
6125         uint32_t flowid, tag;
6126
6127         if (mp_ncpus > 1) {
6128                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6129                         flowid = m->m_pkthdr.flowid;
6130                 } else {
6131                         /*
6132                          * No flow id built by lower layers fix it so we
6133                          * create one.
6134                          */
6135                         offset = off + sizeof(struct sctphdr);
6136                         if (SCTP_BUF_LEN(m) < offset) {
6137                                 if ((m = m_pullup(m, offset)) == NULL) {
6138                                         SCTP_STAT_INCR(sctps_hdrops);
6139                                         return;
6140                                 }
6141                         }
6142                         ip = mtod(m, struct ip *);
6143                         sh = (struct sctphdr *)((caddr_t)ip + off);
6144                         tag = htonl(sh->v_tag);
6145                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6146                         m->m_pkthdr.flowid = flowid;
6147                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6148                 }
6149                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6150                 sctp_queue_to_mcore(m, off, cpu_to_use);
6151                 return;
6152         }
6153 #endif
6154         sctp_input_with_port(m, off, 0);
6155 }
6156
6157 #endif