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 use_mflowid, 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                     use_mflowid, 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                     use_mflowid, 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                     use_mflowid, 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                     use_mflowid, 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                     use_mflowid, 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                     use_mflowid, 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                             use_mflowid, 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                     use_mflowid, 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 use_mflowid, 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                     use_mflowid, 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->peer_supports_asconf == 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                             use_mflowid, 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         struct sockaddr_storage 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 #ifdef INET
 572         struct sockaddr_in *sin;
 573
 574 #endif
 575 #ifdef INET6
 576         struct sockaddr_in6 *sin6;
 577
 578 #endif
 579
 580         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 581                 /* Invalid length */
 582                 return;
 583         }
 584         memset(&store, 0, sizeof(store));
 585         switch (cp->heartbeat.hb_info.addr_family) {
 586 #ifdef INET
 587         case AF_INET:
 588                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 589                         sin = (struct sockaddr_in *)&store;
 590                         sin->sin_family = cp->heartbeat.hb_info.addr_family;
 591                         sin->sin_len = cp->heartbeat.hb_info.addr_len;
 592                         sin->sin_port = stcb->rport;
 593                         memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
 594                             sizeof(sin->sin_addr));
 595                 } else {
 596                         return;
 597                 }
 598                 break;
 599 #endif
 600 #ifdef INET6
 601         case AF_INET6:
 602                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 603                         sin6 = (struct sockaddr_in6 *)&store;
 604                         sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
 605                         sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
 606                         sin6->sin6_port = stcb->rport;
 607                         memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
 608                             sizeof(sin6->sin6_addr));
 609                 } else {
 610                         return;
 611                 }
 612                 break;
 613 #endif
 614         default:
 615                 return;
 616         }
 617         r_net = sctp_findnet(stcb, (struct sockaddr *)&store);
 618         if (r_net == NULL) {
 619                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 620                 return;
 621         }
 622         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 623             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 624             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 625                 /*
 626                  * If the its a HB and it's random value is correct when can
 627                  * confirm the destination.
 628                  */
 629                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 630                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 631                         stcb->asoc.primary_destination = r_net;
 632                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 633                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 634                         if (f_net != r_net) {
 635                                 /*
 636                                  * first one on the list is NOT the primary
 637                                  * sctp_cmpaddr() is much more efficent if
 638                                  * the primary is the first on the list,
 639                                  * make it so.
 640                                  */
 641                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 642                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 643                         }
 644                         req_prim = 1;
 645                 }
 646                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 647                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 648                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 649                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 650         }
 651         old_error_counter = r_net->error_count;
 652         r_net->error_count = 0;
 653         r_net->hb_responded = 1;
 654         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 655         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 656         /* Now lets do a RTO with this */
 657         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 658             SCTP_RTT_FROM_NON_DATA);
 659         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 660                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 661                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 662                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 663         }
 664         if (r_net->dest_state & SCTP_ADDR_PF) {
 665                 r_net->dest_state &= ~SCTP_ADDR_PF;
 666                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 667         }
 668         if (old_error_counter > 0) {
 669                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 670                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 671         }
 672         if (r_net == stcb->asoc.primary_destination) {
 673                 if (stcb->asoc.alternate) {
 674                         /* release the alternate, primary is good */
 675                         sctp_free_remote_addr(stcb->asoc.alternate);
 676                         stcb->asoc.alternate = NULL;
 677                 }
 678         }
 679         /* Mobility adaptation */
 680         if (req_prim) {
 681                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 682                     SCTP_MOBILITY_BASE) ||
 683                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 684                     SCTP_MOBILITY_FASTHANDOFF)) &&
 685                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 686                     SCTP_MOBILITY_PRIM_DELETED)) {
 687
 688                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 689                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 690                             SCTP_MOBILITY_FASTHANDOFF)) {
 691                                 sctp_assoc_immediate_retrans(stcb,
 692                                     stcb->asoc.primary_destination);
 693                         }
 694                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 695                             SCTP_MOBILITY_BASE)) {
 696                                 sctp_move_chunks_from_net(stcb,
 697                                     stcb->asoc.deleted_primary);
 698                         }
 699                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 700                             stcb->asoc.deleted_primary);
 701                 }
 702         }
 703 }
 704
 705 static int
 706 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 707 {
 708         /*
 709          * return 0 means we want you to proceed with the abort non-zero
 710          * means no abort processing
 711          */
 712         struct sctpasochead *head;
 713
 714         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 715                 /* generate a new vtag and send init */
 716                 LIST_REMOVE(stcb, sctp_asocs);
 717                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 718                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 719                 /*
 720                  * put it in the bucket in the vtag hash of assoc's for the
 721                  * system
 722                  */
 723                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 724                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 725                 return (1);
 726         }
 727         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 728                 /*
 729                  * treat like a case where the cookie expired i.e.: - dump
 730                  * current cookie. - generate a new vtag. - resend init.
 731                  */
 732                 /* generate a new vtag and send init */
 733                 LIST_REMOVE(stcb, sctp_asocs);
 734                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 735                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 736                 sctp_stop_all_cookie_timers(stcb);
 737                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 738                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 739                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 740                 /*
 741                  * put it in the bucket in the vtag hash of assoc's for the
 742                  * system
 743                  */
 744                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 745                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 746                 return (1);
 747         }
 748         return (0);
 749 }
 750
 751 static int
 752 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 753     struct sctp_nets *net)
 754 {
 755         /*
 756          * return 0 means we want you to proceed with the abort non-zero
 757          * means no abort processing
 758          */
 759         if (stcb->asoc.peer_supports_auth == 0) {
 760                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 761                 return (0);
 762         }
 763         sctp_asconf_send_nat_state_update(stcb, net);
 764         return (1);
 765 }
 766
 767
 768 static void
 769 sctp_handle_abort(struct sctp_abort_chunk *abort,
 770     struct sctp_tcb *stcb, struct sctp_nets *net)
 771 {
 772 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 773         struct socket *so;
 774
 775 #endif
 776         uint16_t len;
 777         uint16_t error;
 778
 779         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 780         if (stcb == NULL)
 781                 return;
 782
 783         len = ntohs(abort->ch.chunk_length);
 784         if (len > sizeof(struct sctp_chunkhdr)) {
 785                 /*
 786                  * Need to check the cause codes for our two magic nat
 787                  * aborts which don't kill the assoc necessarily.
 788                  */
 789                 struct sctp_missing_nat_state *natc;
 790
 791                 natc = (struct sctp_missing_nat_state *)(abort + 1);
 792                 error = ntohs(natc->cause);
 793                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 794                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 795                             abort->ch.chunk_flags);
 796                         if (sctp_handle_nat_colliding_state(stcb)) {
 797                                 return;
 798                         }
 799                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 800                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 801                             abort->ch.chunk_flags);
 802                         if (sctp_handle_nat_missing_state(stcb, net)) {
 803                                 return;
 804                         }
 805                 }
 806         } else {
 807                 error = 0;
 808         }
 809         /* stop any receive timers */
 810         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 811         /* notify user of the abort and clean up... */
 812         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 813         /* free the tcb */
 814         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 815         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 816             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 817                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 818         }
 819 #ifdef SCTP_ASOCLOG_OF_TSNS
 820         sctp_print_out_track_log(stcb);
 821 #endif
 822 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 823         so = SCTP_INP_SO(stcb->sctp_ep);
 824         atomic_add_int(&stcb->asoc.refcnt, 1);
 825         SCTP_TCB_UNLOCK(stcb);
 826         SCTP_SOCKET_LOCK(so, 1);
 827         SCTP_TCB_LOCK(stcb);
 828         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 829 #endif
 830         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 831         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 832             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 833 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 834         SCTP_SOCKET_UNLOCK(so, 1);
 835 #endif
 836         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 837 }
 838
 839 static void
 840 sctp_start_net_timers(struct sctp_tcb *stcb)
 841 {
 842         uint32_t cnt_hb_sent;
 843         struct sctp_nets *net;
 844
 845         cnt_hb_sent = 0;
 846         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 847                 /*
 848                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 849                  * If the dest in unconfirmed send a hb as well if under
 850                  * max_hb_burst have been sent.
 851                  */
 852                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 853                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 854                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 855                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 856                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 857                         cnt_hb_sent++;
 858                 }
 859         }
 860         if (cnt_hb_sent) {
 861                 sctp_chunk_output(stcb->sctp_ep, stcb,
 862                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 863                     SCTP_SO_NOT_LOCKED);
 864         }
 865 }
 866
 867
 868 static void
 869 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 870     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 871 {
 872         struct sctp_association *asoc;
 873         int some_on_streamwheel;
 874
 875 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 876         struct socket *so;
 877
 878 #endif
 879
 880         SCTPDBG(SCTP_DEBUG_INPUT2,
 881             "sctp_handle_shutdown: handling SHUTDOWN\n");
 882         if (stcb == NULL)
 883                 return;
 884         asoc = &stcb->asoc;
 885         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 886             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 887                 return;
 888         }
 889         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 890                 /* Shutdown NOT the expected size */
 891                 return;
 892         } else {
 893                 sctp_update_acked(stcb, cp, abort_flag);
 894                 if (*abort_flag) {
 895                         return;
 896                 }
 897         }
 898         if (asoc->control_pdapi) {
 899                 /*
 900                  * With a normal shutdown we assume the end of last record.
 901                  */
 902                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 903                 asoc->control_pdapi->end_added = 1;
 904                 asoc->control_pdapi->pdapi_aborted = 1;
 905                 asoc->control_pdapi = NULL;
 906                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 907 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 908                 so = SCTP_INP_SO(stcb->sctp_ep);
 909                 atomic_add_int(&stcb->asoc.refcnt, 1);
 910                 SCTP_TCB_UNLOCK(stcb);
 911                 SCTP_SOCKET_LOCK(so, 1);
 912                 SCTP_TCB_LOCK(stcb);
 913                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 914                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 915                         /* assoc was freed while we were unlocked */
 916                         SCTP_SOCKET_UNLOCK(so, 1);
 917                         return;
 918                 }
 919 #endif
 920                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 921 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 922                 SCTP_SOCKET_UNLOCK(so, 1);
 923 #endif
 924         }
 925         /* goto SHUTDOWN_RECEIVED state to block new requests */
 926         if (stcb->sctp_socket) {
 927                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 928                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 929                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 930                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 931                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 932                         /*
 933                          * notify upper layer that peer has initiated a
 934                          * shutdown
 935                          */
 936                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 937
 938                         /* reset time */
 939                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 940                 }
 941         }
 942         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 943                 /*
 944                  * stop the shutdown timer, since we WILL move to
 945                  * SHUTDOWN-ACK-SENT.
 946                  */
 947                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 948         }
 949         /* Now is there unsent data on a stream somewhere? */
 950         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 951
 952         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 953             !TAILQ_EMPTY(&asoc->sent_queue) ||
 954             some_on_streamwheel) {
 955                 /* By returning we will push more data out */
 956                 return;
 957         } else {
 958                 /* no outstanding data to send, so move on... */
 959                 /* send SHUTDOWN-ACK */
 960                 /* move to SHUTDOWN-ACK-SENT state */
 961                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 962                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 963                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 964                 }
 965                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 966                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 967                 sctp_stop_timers_for_shutdown(stcb);
 968                 sctp_send_shutdown_ack(stcb, net);
 969                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 970                     stcb, net);
 971         }
 972 }
 973
 974 static void
 975 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 976     struct sctp_tcb *stcb,
 977     struct sctp_nets *net)
 978 {
 979         struct sctp_association *asoc;
 980
 981 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 982         struct socket *so;
 983
 984         so = SCTP_INP_SO(stcb->sctp_ep);
 985 #endif
 986         SCTPDBG(SCTP_DEBUG_INPUT2,
 987             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 988         if (stcb == NULL)
 989                 return;
 990
 991         asoc = &stcb->asoc;
 992         /* process according to association state */
 993         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 994             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 995                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 996                 sctp_send_shutdown_complete(stcb, net, 1);
 997                 SCTP_TCB_UNLOCK(stcb);
 998                 return;
 999         }
1000         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
1001             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1002                 /* unexpected SHUTDOWN-ACK... so ignore... */
1003                 SCTP_TCB_UNLOCK(stcb);
1004                 return;
1005         }
1006         if (asoc->control_pdapi) {
1007                 /*
1008                  * With a normal shutdown we assume the end of last record.
1009                  */
1010                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1011                 asoc->control_pdapi->end_added = 1;
1012                 asoc->control_pdapi->pdapi_aborted = 1;
1013                 asoc->control_pdapi = NULL;
1014                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1015 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1016                 atomic_add_int(&stcb->asoc.refcnt, 1);
1017                 SCTP_TCB_UNLOCK(stcb);
1018                 SCTP_SOCKET_LOCK(so, 1);
1019                 SCTP_TCB_LOCK(stcb);
1020                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1021                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1022                         /* assoc was freed while we were unlocked */
1023                         SCTP_SOCKET_UNLOCK(so, 1);
1024                         return;
1025                 }
1026 #endif
1027                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1028 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1029                 SCTP_SOCKET_UNLOCK(so, 1);
1030 #endif
1031         }
1032 #ifdef INVARIANTS
1033         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1034             !TAILQ_EMPTY(&asoc->sent_queue) ||
1035             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1036                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1037         }
1038 #endif
1039         /* stop the timer */
1040         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1041         /* send SHUTDOWN-COMPLETE */
1042         sctp_send_shutdown_complete(stcb, net, 0);
1043         /* notify upper layer protocol */
1044         if (stcb->sctp_socket) {
1045                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1046                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1047                         stcb->sctp_socket->so_snd.sb_cc = 0;
1048                 }
1049                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1050         }
1051         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1052         /* free the TCB but first save off the ep */
1053 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1054         atomic_add_int(&stcb->asoc.refcnt, 1);
1055         SCTP_TCB_UNLOCK(stcb);
1056         SCTP_SOCKET_LOCK(so, 1);
1057         SCTP_TCB_LOCK(stcb);
1058         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1059 #endif
1060         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1061             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1062 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1063         SCTP_SOCKET_UNLOCK(so, 1);
1064 #endif
1065 }
1066
1067 /*
1068  * Skip past the param header and then we will find the chunk that caused the
1069  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1070  * our peer must be broken.
1071  */
1072 static void
1073 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1074     struct sctp_nets *net)
1075 {
1076         struct sctp_chunkhdr *chk;
1077
1078         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1079         switch (chk->chunk_type) {
1080         case SCTP_ASCONF_ACK:
1081         case SCTP_ASCONF:
1082                 sctp_asconf_cleanup(stcb, net);
1083                 break;
1084         case SCTP_FORWARD_CUM_TSN:
1085                 stcb->asoc.prsctp_supported = 0;
1086                 break;
1087         default:
1088                 SCTPDBG(SCTP_DEBUG_INPUT2,
1089                     "Peer does not support chunk type %d(%x)??\n",
1090                     chk->chunk_type, (uint32_t) chk->chunk_type);
1091                 break;
1092         }
1093 }
1094
1095 /*
1096  * Skip past the param header and then we will find the param that caused the
1097  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1098  * these will turn of specific features.
1099  */
1100 static void
1101 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1102 {
1103         struct sctp_paramhdr *pbad;
1104
1105         pbad = phdr + 1;
1106         switch (ntohs(pbad->param_type)) {
1107                 /* pr-sctp draft */
1108         case SCTP_PRSCTP_SUPPORTED:
1109                 stcb->asoc.prsctp_supported = 0;
1110                 break;
1111         case SCTP_SUPPORTED_CHUNK_EXT:
1112                 break;
1113                 /* draft-ietf-tsvwg-addip-sctp */
1114         case SCTP_HAS_NAT_SUPPORT:
1115                 stcb->asoc.peer_supports_nat = 0;
1116                 break;
1117         case SCTP_ADD_IP_ADDRESS:
1118         case SCTP_DEL_IP_ADDRESS:
1119         case SCTP_SET_PRIM_ADDR:
1120                 stcb->asoc.peer_supports_asconf = 0;
1121                 break;
1122         case SCTP_SUCCESS_REPORT:
1123         case SCTP_ERROR_CAUSE_IND:
1124                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1125                 SCTPDBG(SCTP_DEBUG_INPUT2,
1126                     "Turning off ASCONF to this strange peer\n");
1127                 stcb->asoc.peer_supports_asconf = 0;
1128                 break;
1129         default:
1130                 SCTPDBG(SCTP_DEBUG_INPUT2,
1131                     "Peer does not support param type %d(%x)??\n",
1132                     pbad->param_type, (uint32_t) pbad->param_type);
1133                 break;
1134         }
1135 }
1136
1137 static int
1138 sctp_handle_error(struct sctp_chunkhdr *ch,
1139     struct sctp_tcb *stcb, struct sctp_nets *net)
1140 {
1141         int chklen;
1142         struct sctp_paramhdr *phdr;
1143         uint16_t error, error_type;
1144         uint16_t error_len;
1145         struct sctp_association *asoc;
1146         int adjust;
1147
1148 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1149         struct socket *so;
1150
1151 #endif
1152
1153         /* parse through all of the errors and process */
1154         asoc = &stcb->asoc;
1155         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1156             sizeof(struct sctp_chunkhdr));
1157         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1158         error = 0;
1159         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1160                 /* Process an Error Cause */
1161                 error_type = ntohs(phdr->param_type);
1162                 error_len = ntohs(phdr->param_length);
1163                 if ((error_len > chklen) || (error_len == 0)) {
1164                         /* invalid param length for this param */
1165                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1166                             chklen, error_len);
1167                         return (0);
1168                 }
1169                 if (error == 0) {
1170                         /* report the first error cause */
1171                         error = error_type;
1172                 }
1173                 switch (error_type) {
1174                 case SCTP_CAUSE_INVALID_STREAM:
1175                 case SCTP_CAUSE_MISSING_PARAM:
1176                 case SCTP_CAUSE_INVALID_PARAM:
1177                 case SCTP_CAUSE_NO_USER_DATA:
1178                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1179                             error_type);
1180                         break;
1181                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1182                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1183                             ch->chunk_flags);
1184                         if (sctp_handle_nat_colliding_state(stcb)) {
1185                                 return (0);
1186                         }
1187                         break;
1188                 case SCTP_CAUSE_NAT_MISSING_STATE:
1189                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1190                             ch->chunk_flags);
1191                         if (sctp_handle_nat_missing_state(stcb, net)) {
1192                                 return (0);
1193                         }
1194                         break;
1195                 case SCTP_CAUSE_STALE_COOKIE:
1196                         /*
1197                          * We only act if we have echoed a cookie and are
1198                          * waiting.
1199                          */
1200                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1201                                 int *p;
1202
1203                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1204                                 /* Save the time doubled */
1205                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1206                                 asoc->stale_cookie_count++;
1207                                 if (asoc->stale_cookie_count >
1208                                     asoc->max_init_times) {
1209                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1210                                         /* now free the asoc */
1211 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1212                                         so = SCTP_INP_SO(stcb->sctp_ep);
1213                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1214                                         SCTP_TCB_UNLOCK(stcb);
1215                                         SCTP_SOCKET_LOCK(so, 1);
1216                                         SCTP_TCB_LOCK(stcb);
1217                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1218 #endif
1219                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1220                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1221 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1222                                         SCTP_SOCKET_UNLOCK(so, 1);
1223 #endif
1224                                         return (-1);
1225                                 }
1226                                 /* blast back to INIT state */
1227                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1228                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1229                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1230                                 sctp_stop_all_cookie_timers(stcb);
1231                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1232                         }
1233                         break;
1234                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1235                         /*
1236                          * Nothing we can do here, we don't do hostname
1237                          * addresses so if the peer does not like my IPv6
1238                          * (or IPv4 for that matter) it does not matter. If
1239                          * they don't support that type of address, they can
1240                          * NOT possibly get that packet type... i.e. with no
1241                          * IPv6 you can't recieve a IPv6 packet. so we can
1242                          * safely ignore this one. If we ever added support
1243                          * for HOSTNAME Addresses, then we would need to do
1244                          * something here.
1245                          */
1246                         break;
1247                 case SCTP_CAUSE_UNRECOG_CHUNK:
1248                         sctp_process_unrecog_chunk(stcb, phdr, net);
1249                         break;
1250                 case SCTP_CAUSE_UNRECOG_PARAM:
1251                         sctp_process_unrecog_param(stcb, phdr);
1252                         break;
1253                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1254                         /*
1255                          * We ignore this since the timer will drive out a
1256                          * new cookie anyway and there timer will drive us
1257                          * to send a SHUTDOWN_COMPLETE. We can't send one
1258                          * here since we don't have their tag.
1259                          */
1260                         break;
1261                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1262                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1263                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1264                         /*
1265                          * We should NOT get these here, but in a
1266                          * ASCONF-ACK.
1267                          */
1268                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1269                             error_type);
1270                         break;
1271                 case SCTP_CAUSE_OUT_OF_RESC:
1272                         /*
1273                          * And what, pray tell do we do with the fact that
1274                          * the peer is out of resources? Not really sure we
1275                          * could do anything but abort. I suspect this
1276                          * should have came WITH an abort instead of in a
1277                          * OP-ERROR.
1278                          */
1279                         break;
1280                 default:
1281                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1282                             error_type);
1283                         break;
1284                 }
1285                 adjust = SCTP_SIZE32(error_len);
1286                 chklen -= adjust;
1287                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1288         }
1289         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1290         return (0);
1291 }
1292
1293 static int
1294 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1295     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1296     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1297     struct sctp_nets *net, int *abort_no_unlock,
1298     uint8_t use_mflowid, uint32_t mflowid,
1299     uint32_t vrf_id)
1300 {
1301         struct sctp_init_ack *init_ack;
1302         struct mbuf *op_err;
1303
1304         SCTPDBG(SCTP_DEBUG_INPUT2,
1305             "sctp_handle_init_ack: handling INIT-ACK\n");
1306
1307         if (stcb == NULL) {
1308                 SCTPDBG(SCTP_DEBUG_INPUT2,
1309                     "sctp_handle_init_ack: TCB is null\n");
1310                 return (-1);
1311         }
1312         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1313                 /* Invalid length */
1314                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1315                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1316                     src, dst, sh, op_err,
1317                     use_mflowid, mflowid,
1318                     vrf_id, net->port);
1319                 *abort_no_unlock = 1;
1320                 return (-1);
1321         }
1322         init_ack = &cp->init;
1323         /* validate parameters */
1324         if (init_ack->initiate_tag == 0) {
1325                 /* protocol error... send an abort */
1326                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1327                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1328                     src, dst, sh, op_err,
1329                     use_mflowid, mflowid,
1330                     vrf_id, net->port);
1331                 *abort_no_unlock = 1;
1332                 return (-1);
1333         }
1334         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1335                 /* protocol error... send an abort */
1336                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1337                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1338                     src, dst, sh, op_err,
1339                     use_mflowid, mflowid,
1340                     vrf_id, net->port);
1341                 *abort_no_unlock = 1;
1342                 return (-1);
1343         }
1344         if (init_ack->num_inbound_streams == 0) {
1345                 /* protocol error... send an abort */
1346                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1347                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1348                     src, dst, sh, op_err,
1349                     use_mflowid, mflowid,
1350                     vrf_id, net->port);
1351                 *abort_no_unlock = 1;
1352                 return (-1);
1353         }
1354         if (init_ack->num_outbound_streams == 0) {
1355                 /* protocol error... send an abort */
1356                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1357                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1358                     src, dst, sh, op_err,
1359                     use_mflowid, mflowid,
1360                     vrf_id, net->port);
1361                 *abort_no_unlock = 1;
1362                 return (-1);
1363         }
1364         /* process according to association state... */
1365         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1366         case SCTP_STATE_COOKIE_WAIT:
1367                 /* this is the expected state for this chunk */
1368                 /* process the INIT-ACK parameters */
1369                 if (stcb->asoc.primary_destination->dest_state &
1370                     SCTP_ADDR_UNCONFIRMED) {
1371                         /*
1372                          * The primary is where we sent the INIT, we can
1373                          * always consider it confirmed when the INIT-ACK is
1374                          * returned. Do this before we load addresses
1375                          * though.
1376                          */
1377                         stcb->asoc.primary_destination->dest_state &=
1378                             ~SCTP_ADDR_UNCONFIRMED;
1379                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1380                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1381                 }
1382                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1383                     net, abort_no_unlock,
1384                     use_mflowid, mflowid,
1385                     vrf_id) < 0) {
1386                         /* error in parsing parameters */
1387                         return (-1);
1388                 }
1389                 /* update our state */
1390                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1391                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1392
1393                 /* reset the RTO calc */
1394                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1395                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1396                             stcb->asoc.overall_error_count,
1397                             0,
1398                             SCTP_FROM_SCTP_INPUT,
1399                             __LINE__);
1400                 }
1401                 stcb->asoc.overall_error_count = 0;
1402                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1403                 /*
1404                  * collapse the init timer back in case of a exponential
1405                  * backoff
1406                  */
1407                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1408                     stcb, net);
1409                 /*
1410                  * the send at the end of the inbound data processing will
1411                  * cause the cookie to be sent
1412                  */
1413                 break;
1414         case SCTP_STATE_SHUTDOWN_SENT:
1415                 /* incorrect state... discard */
1416                 break;
1417         case SCTP_STATE_COOKIE_ECHOED:
1418                 /* incorrect state... discard */
1419                 break;
1420         case SCTP_STATE_OPEN:
1421                 /* incorrect state... discard */
1422                 break;
1423         case SCTP_STATE_EMPTY:
1424         case SCTP_STATE_INUSE:
1425         default:
1426                 /* incorrect state... discard */
1427                 return (-1);
1428                 break;
1429         }
1430         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1431         return (0);
1432 }
1433
1434 static struct sctp_tcb *
1435 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1436     struct sockaddr *src, struct sockaddr *dst,
1437     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1438     struct sctp_inpcb *inp, struct sctp_nets **netp,
1439     struct sockaddr *init_src, int *notification,
1440     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1441     uint8_t use_mflowid, uint32_t mflowid,
1442     uint32_t vrf_id, uint16_t port);
1443
1444
1445 /*
1446  * handle a state cookie for an existing association m: input packet mbuf
1447  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1448  * "split" mbuf and the cookie signature does not exist offset: offset into
1449  * mbuf to the cookie-echo chunk
1450  */
1451 static struct sctp_tcb *
1452 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1453     struct sockaddr *src, struct sockaddr *dst,
1454     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1455     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1456     struct sockaddr *init_src, int *notification,
1457     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1458     uint8_t use_mflowid, uint32_t mflowid,
1459     uint32_t vrf_id, uint16_t port)
1460 {
1461         struct sctp_association *asoc;
1462         struct sctp_init_chunk *init_cp, init_buf;
1463         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1464         struct sctp_nets *net;
1465         struct mbuf *op_err;
1466         int init_offset, initack_offset, i;
1467         int retval;
1468         int spec_flag = 0;
1469         uint32_t how_indx;
1470
1471         net = *netp;
1472         /* I know that the TCB is non-NULL from the caller */
1473         asoc = &stcb->asoc;
1474         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1475                 if (asoc->cookie_how[how_indx] == 0)
1476                         break;
1477         }
1478         if (how_indx < sizeof(asoc->cookie_how)) {
1479                 asoc->cookie_how[how_indx] = 1;
1480         }
1481         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1482                 /* SHUTDOWN came in after sending INIT-ACK */
1483                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1484                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1485                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1486                     use_mflowid, mflowid,
1487                     vrf_id, net->port);
1488                 if (how_indx < sizeof(asoc->cookie_how))
1489                         asoc->cookie_how[how_indx] = 2;
1490                 return (NULL);
1491         }
1492         /*
1493          * find and validate the INIT chunk in the cookie (peer's info) the
1494          * INIT should start after the cookie-echo header struct (chunk
1495          * header, state cookie header struct)
1496          */
1497         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1498
1499         init_cp = (struct sctp_init_chunk *)
1500             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1501             (uint8_t *) & init_buf);
1502         if (init_cp == NULL) {
1503                 /* could not pull a INIT chunk in cookie */
1504                 return (NULL);
1505         }
1506         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1507                 return (NULL);
1508         }
1509         /*
1510          * find and validate the INIT-ACK chunk in the cookie (my info) the
1511          * INIT-ACK follows the INIT chunk
1512          */
1513         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1514         initack_cp = (struct sctp_init_ack_chunk *)
1515             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1516             (uint8_t *) & initack_buf);
1517         if (initack_cp == NULL) {
1518                 /* could not pull INIT-ACK chunk in cookie */
1519                 return (NULL);
1520         }
1521         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1522                 return (NULL);
1523         }
1524         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1525             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1526                 /*
1527                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1528                  * to get into the OPEN state
1529                  */
1530                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1531                         /*-
1532                          * Opps, this means that we somehow generated two vtag's
1533                          * the same. I.e. we did:
1534                          *  Us               Peer
1535                          *   <---INIT(tag=a)------
1536                          *   ----INIT-ACK(tag=t)-->
1537                          *   ----INIT(tag=t)------> *1
1538                          *   <---INIT-ACK(tag=a)---
1539                          *   <----CE(tag=t)------------- *2
1540                          *
1541                          * At point *1 we should be generating a different
1542                          * tag t'. Which means we would throw away the CE and send
1543                          * ours instead. Basically this is case C (throw away side).
1544                          */
1545                         if (how_indx < sizeof(asoc->cookie_how))
1546                                 asoc->cookie_how[how_indx] = 17;
1547                         return (NULL);
1548
1549                 }
1550                 switch (SCTP_GET_STATE(asoc)) {
1551                 case SCTP_STATE_COOKIE_WAIT:
1552                 case SCTP_STATE_COOKIE_ECHOED:
1553                         /*
1554                          * INIT was sent but got a COOKIE_ECHO with the
1555                          * correct tags... just accept it...but we must
1556                          * process the init so that we can make sure we have
1557                          * the right seq no's.
1558                          */
1559                         /* First we must process the INIT !! */
1560                         retval = sctp_process_init(init_cp, stcb);
1561                         if (retval < 0) {
1562                                 if (how_indx < sizeof(asoc->cookie_how))
1563                                         asoc->cookie_how[how_indx] = 3;
1564                                 return (NULL);
1565                         }
1566                         /* we have already processed the INIT so no problem */
1567                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1568                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1569                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1570                         /* update current state */
1571                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1572                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1573                         else
1574                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1575
1576                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1577                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1578                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1579                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1580                         }
1581                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1582                         sctp_stop_all_cookie_timers(stcb);
1583                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1584                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1585                             (inp->sctp_socket->so_qlimit == 0)
1586                             ) {
1587 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1588                                 struct socket *so;
1589
1590 #endif
1591                                 /*
1592                                  * Here is where collision would go if we
1593                                  * did a connect() and instead got a
1594                                  * init/init-ack/cookie done before the
1595                                  * init-ack came back..
1596                                  */
1597                                 stcb->sctp_ep->sctp_flags |=
1598                                     SCTP_PCB_FLAGS_CONNECTED;
1599 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1600                                 so = SCTP_INP_SO(stcb->sctp_ep);
1601                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1602                                 SCTP_TCB_UNLOCK(stcb);
1603                                 SCTP_SOCKET_LOCK(so, 1);
1604                                 SCTP_TCB_LOCK(stcb);
1605                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1606                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1607                                         SCTP_SOCKET_UNLOCK(so, 1);
1608                                         return (NULL);
1609                                 }
1610 #endif
1611                                 soisconnected(stcb->sctp_socket);
1612 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1613                                 SCTP_SOCKET_UNLOCK(so, 1);
1614 #endif
1615                         }
1616                         /* notify upper layer */
1617                         *notification = SCTP_NOTIFY_ASSOC_UP;
1618                         /*
1619                          * since we did not send a HB make sure we don't
1620                          * double things
1621                          */
1622                         net->hb_responded = 1;
1623                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1624                             &cookie->time_entered,
1625                             sctp_align_unsafe_makecopy,
1626                             SCTP_RTT_FROM_NON_DATA);
1627
1628                         if (stcb->asoc.sctp_autoclose_ticks &&
1629                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1630                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1631                                     inp, stcb, NULL);
1632                         }
1633                         break;
1634                 default:
1635                         /*
1636                          * we're in the OPEN state (or beyond), so peer must
1637                          * have simply lost the COOKIE-ACK
1638                          */
1639                         break;
1640                 }               /* end switch */
1641                 sctp_stop_all_cookie_timers(stcb);
1642                 /*
1643                  * We ignore the return code here.. not sure if we should
1644                  * somehow abort.. but we do have an existing asoc. This
1645                  * really should not fail.
1646                  */
1647                 if (sctp_load_addresses_from_init(stcb, m,
1648                     init_offset + sizeof(struct sctp_init_chunk),
1649                     initack_offset, src, dst, init_src)) {
1650                         if (how_indx < sizeof(asoc->cookie_how))
1651                                 asoc->cookie_how[how_indx] = 4;
1652                         return (NULL);
1653                 }
1654                 /* respond with a COOKIE-ACK */
1655                 sctp_toss_old_cookies(stcb, asoc);
1656                 sctp_send_cookie_ack(stcb);
1657                 if (how_indx < sizeof(asoc->cookie_how))
1658                         asoc->cookie_how[how_indx] = 5;
1659                 return (stcb);
1660         }
1661         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1662             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1663             cookie->tie_tag_my_vtag == 0 &&
1664             cookie->tie_tag_peer_vtag == 0) {
1665                 /*
1666                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1667                  */
1668                 if (how_indx < sizeof(asoc->cookie_how))
1669                         asoc->cookie_how[how_indx] = 6;
1670                 return (NULL);
1671         }
1672         /*
1673          * If nat support, and the below and stcb is established, send back
1674          * a ABORT(colliding state) if we are established.
1675          */
1676         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1677             (asoc->peer_supports_nat) &&
1678             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1679             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1680             (asoc->peer_vtag == 0)))) {
1681                 /*
1682                  * Special case - Peer's support nat. We may have two init's
1683                  * that we gave out the same tag on since one was not
1684                  * established.. i.e. we get INIT from host-1 behind the nat
1685                  * and we respond tag-a, we get a INIT from host-2 behind
1686                  * the nat and we get tag-a again. Then we bring up host-1
1687                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1688                  * Now we have colliding state. We must send an abort here
1689                  * with colliding state indication.
1690                  */
1691                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1692                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1693                     use_mflowid, mflowid,
1694                     vrf_id, port);
1695                 return (NULL);
1696         }
1697         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1698             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1699             (asoc->peer_vtag == 0))) {
1700                 /*
1701                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1702                  * should be ok, re-accept peer info
1703                  */
1704                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1705                         /*
1706                          * Extension of case C. If we hit this, then the
1707                          * random number generator returned the same vtag
1708                          * when we first sent our INIT-ACK and when we later
1709                          * sent our INIT. The side with the seq numbers that
1710                          * are different will be the one that normnally
1711                          * would have hit case C. This in effect "extends"
1712                          * our vtags in this collision case to be 64 bits.
1713                          * The same collision could occur aka you get both
1714                          * vtag and seq number the same twice in a row.. but
1715                          * is much less likely. If it did happen then we
1716                          * would proceed through and bring up the assoc.. we
1717                          * may end up with the wrong stream setup however..
1718                          * which would be bad.. but there is no way to
1719                          * tell.. until we send on a stream that does not
1720                          * exist :-)
1721                          */
1722                         if (how_indx < sizeof(asoc->cookie_how))
1723                                 asoc->cookie_how[how_indx] = 7;
1724
1725                         return (NULL);
1726                 }
1727                 if (how_indx < sizeof(asoc->cookie_how))
1728                         asoc->cookie_how[how_indx] = 8;
1729                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1730                 sctp_stop_all_cookie_timers(stcb);
1731                 /*
1732                  * since we did not send a HB make sure we don't double
1733                  * things
1734                  */
1735                 net->hb_responded = 1;
1736                 if (stcb->asoc.sctp_autoclose_ticks &&
1737                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1738                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1739                             NULL);
1740                 }
1741                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1742                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1743
1744                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1745                         /*
1746                          * Ok the peer probably discarded our data (if we
1747                          * echoed a cookie+data). So anything on the
1748                          * sent_queue should be marked for retransmit, we
1749                          * may not get something to kick us so it COULD
1750                          * still take a timeout to move these.. but it can't
1751                          * hurt to mark them.
1752                          */
1753                         struct sctp_tmit_chunk *chk;
1754
1755                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1756                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1757                                         chk->sent = SCTP_DATAGRAM_RESEND;
1758                                         sctp_flight_size_decrease(chk);
1759                                         sctp_total_flight_decrease(stcb, chk);
1760                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1761                                         spec_flag++;
1762                                 }
1763                         }
1764
1765                 }
1766                 /* process the INIT info (peer's info) */
1767                 retval = sctp_process_init(init_cp, stcb);
1768                 if (retval < 0) {
1769                         if (how_indx < sizeof(asoc->cookie_how))
1770                                 asoc->cookie_how[how_indx] = 9;
1771                         return (NULL);
1772                 }
1773                 if (sctp_load_addresses_from_init(stcb, m,
1774                     init_offset + sizeof(struct sctp_init_chunk),
1775                     initack_offset, src, dst, init_src)) {
1776                         if (how_indx < sizeof(asoc->cookie_how))
1777                                 asoc->cookie_how[how_indx] = 10;
1778                         return (NULL);
1779                 }
1780                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1781                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1782                         *notification = SCTP_NOTIFY_ASSOC_UP;
1783
1784                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1785                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1786                             (inp->sctp_socket->so_qlimit == 0)) {
1787 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1788                                 struct socket *so;
1789
1790 #endif
1791                                 stcb->sctp_ep->sctp_flags |=
1792                                     SCTP_PCB_FLAGS_CONNECTED;
1793 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1794                                 so = SCTP_INP_SO(stcb->sctp_ep);
1795                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1796                                 SCTP_TCB_UNLOCK(stcb);
1797                                 SCTP_SOCKET_LOCK(so, 1);
1798                                 SCTP_TCB_LOCK(stcb);
1799                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1800                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1801                                         SCTP_SOCKET_UNLOCK(so, 1);
1802                                         return (NULL);
1803                                 }
1804 #endif
1805                                 soisconnected(stcb->sctp_socket);
1806 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1807                                 SCTP_SOCKET_UNLOCK(so, 1);
1808 #endif
1809                         }
1810                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1811                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1812                         else
1813                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1814                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1815                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1816                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1817                 } else {
1818                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1819                 }
1820                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1821                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1822                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1823                             stcb->sctp_ep, stcb, asoc->primary_destination);
1824                 }
1825                 sctp_stop_all_cookie_timers(stcb);
1826                 sctp_toss_old_cookies(stcb, asoc);
1827                 sctp_send_cookie_ack(stcb);
1828                 if (spec_flag) {
1829                         /*
1830                          * only if we have retrans set do we do this. What
1831                          * this call does is get only the COOKIE-ACK out and
1832                          * then when we return the normal call to
1833                          * sctp_chunk_output will get the retrans out behind
1834                          * this.
1835                          */
1836                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1837                 }
1838                 if (how_indx < sizeof(asoc->cookie_how))
1839                         asoc->cookie_how[how_indx] = 11;
1840
1841                 return (stcb);
1842         }
1843         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1844             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1845             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1846             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1847             cookie->tie_tag_peer_vtag != 0) {
1848                 struct sctpasochead *head;
1849
1850 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1851                 struct socket *so;
1852
1853 #endif
1854
1855                 if (asoc->peer_supports_nat) {
1856                         /*
1857                          * This is a gross gross hack. Just call the
1858                          * cookie_new code since we are allowing a duplicate
1859                          * association. I hope this works...
1860                          */
1861                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1862                             sh, cookie, cookie_len,
1863                             inp, netp, init_src, notification,
1864                             auth_skipped, auth_offset, auth_len,
1865                             use_mflowid, mflowid,
1866                             vrf_id, port));
1867                 }
1868                 /*
1869                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1870                  */
1871                 /* temp code */
1872                 if (how_indx < sizeof(asoc->cookie_how))
1873                         asoc->cookie_how[how_indx] = 12;
1874                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1875                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1876
1877                 /* notify upper layer */
1878                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1879                 atomic_add_int(&stcb->asoc.refcnt, 1);
1880                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1881                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1882                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1883                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1884                 }
1885                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1886                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1887                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1888                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1889                 }
1890                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1891                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1892                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1893                             stcb->sctp_ep, stcb, asoc->primary_destination);
1894
1895                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1896                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1897                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1898                 }
1899                 asoc->pre_open_streams =
1900                     ntohs(initack_cp->init.num_outbound_streams);
1901                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1902                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1903                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1904
1905                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1906
1907                 asoc->str_reset_seq_in = asoc->init_seq_number;
1908
1909                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1910                 if (asoc->mapping_array) {
1911                         memset(asoc->mapping_array, 0,
1912                             asoc->mapping_array_size);
1913                 }
1914                 if (asoc->nr_mapping_array) {
1915                         memset(asoc->nr_mapping_array, 0,
1916                             asoc->mapping_array_size);
1917                 }
1918                 SCTP_TCB_UNLOCK(stcb);
1919 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1920                 so = SCTP_INP_SO(stcb->sctp_ep);
1921                 SCTP_SOCKET_LOCK(so, 1);
1922 #endif
1923                 SCTP_INP_INFO_WLOCK();
1924                 SCTP_INP_WLOCK(stcb->sctp_ep);
1925                 SCTP_TCB_LOCK(stcb);
1926                 atomic_add_int(&stcb->asoc.refcnt, -1);
1927                 /* send up all the data */
1928                 SCTP_TCB_SEND_LOCK(stcb);
1929
1930                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1931                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1932                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1933                         stcb->asoc.strmout[i].stream_no = i;
1934                         stcb->asoc.strmout[i].next_sequence_send = 0;
1935                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1936                 }
1937                 /* process the INIT-ACK info (my info) */
1938                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1939                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1940
1941                 /* pull from vtag hash */
1942                 LIST_REMOVE(stcb, sctp_asocs);
1943                 /* re-insert to new vtag position */
1944                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1945                     SCTP_BASE_INFO(hashasocmark))];
1946                 /*
1947                  * put it in the bucket in the vtag hash of assoc's for the
1948                  * system
1949                  */
1950                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1951
1952                 SCTP_TCB_SEND_UNLOCK(stcb);
1953                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1954                 SCTP_INP_INFO_WUNLOCK();
1955 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1956                 SCTP_SOCKET_UNLOCK(so, 1);
1957 #endif
1958                 asoc->total_flight = 0;
1959                 asoc->total_flight_count = 0;
1960                 /* process the INIT info (peer's info) */
1961                 retval = sctp_process_init(init_cp, stcb);
1962                 if (retval < 0) {
1963                         if (how_indx < sizeof(asoc->cookie_how))
1964                                 asoc->cookie_how[how_indx] = 13;
1965
1966                         return (NULL);
1967                 }
1968                 /*
1969                  * since we did not send a HB make sure we don't double
1970                  * things
1971                  */
1972                 net->hb_responded = 1;
1973
1974                 if (sctp_load_addresses_from_init(stcb, m,
1975                     init_offset + sizeof(struct sctp_init_chunk),
1976                     initack_offset, src, dst, init_src)) {
1977                         if (how_indx < sizeof(asoc->cookie_how))
1978                                 asoc->cookie_how[how_indx] = 14;
1979
1980                         return (NULL);
1981                 }
1982                 /* respond with a COOKIE-ACK */
1983                 sctp_stop_all_cookie_timers(stcb);
1984                 sctp_toss_old_cookies(stcb, asoc);
1985                 sctp_send_cookie_ack(stcb);
1986                 if (how_indx < sizeof(asoc->cookie_how))
1987                         asoc->cookie_how[how_indx] = 15;
1988
1989                 return (stcb);
1990         }
1991         if (how_indx < sizeof(asoc->cookie_how))
1992                 asoc->cookie_how[how_indx] = 16;
1993         /* all other cases... */
1994         return (NULL);
1995 }
1996
1997
1998 /*
1999  * handle a state cookie for a new association m: input packet mbuf chain--
2000  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2001  * and the cookie signature does not exist offset: offset into mbuf to the
2002  * cookie-echo chunk length: length of the cookie chunk to: where the init
2003  * was from returns a new TCB
2004  */
2005 static struct sctp_tcb *
2006 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2007     struct sockaddr *src, struct sockaddr *dst,
2008     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2009     struct sctp_inpcb *inp, struct sctp_nets **netp,
2010     struct sockaddr *init_src, int *notification,
2011     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2012     uint8_t use_mflowid, uint32_t mflowid,
2013     uint32_t vrf_id, uint16_t port)
2014 {
2015         struct sctp_tcb *stcb;
2016         struct sctp_init_chunk *init_cp, init_buf;
2017         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2018         struct sockaddr_storage sa_store;
2019         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
2020         struct sctp_association *asoc;
2021         int init_offset, initack_offset, initack_limit;
2022         int retval;
2023         int error = 0;
2024         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2025
2026 #ifdef INET
2027         struct sockaddr_in *sin;
2028
2029 #endif
2030 #ifdef INET6
2031         struct sockaddr_in6 *sin6;
2032
2033 #endif
2034 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2035         struct socket *so;
2036
2037         so = SCTP_INP_SO(inp);
2038 #endif
2039
2040         /*
2041          * find and validate the INIT chunk in the cookie (peer's info) the
2042          * INIT should start after the cookie-echo header struct (chunk
2043          * header, state cookie header struct)
2044          */
2045         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2046         init_cp = (struct sctp_init_chunk *)
2047             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2048             (uint8_t *) & init_buf);
2049         if (init_cp == NULL) {
2050                 /* could not pull a INIT chunk in cookie */
2051                 SCTPDBG(SCTP_DEBUG_INPUT1,
2052                     "process_cookie_new: could not pull INIT chunk hdr\n");
2053                 return (NULL);
2054         }
2055         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2056                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2057                 return (NULL);
2058         }
2059         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2060         /*
2061          * find and validate the INIT-ACK chunk in the cookie (my info) the
2062          * INIT-ACK follows the INIT chunk
2063          */
2064         initack_cp = (struct sctp_init_ack_chunk *)
2065             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2066             (uint8_t *) & initack_buf);
2067         if (initack_cp == NULL) {
2068                 /* could not pull INIT-ACK chunk in cookie */
2069                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2070                 return (NULL);
2071         }
2072         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2073                 return (NULL);
2074         }
2075         /*
2076          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2077          * "initack_limit" value.  This is because the chk_length field
2078          * includes the length of the cookie, but the cookie is omitted when
2079          * the INIT and INIT_ACK are tacked onto the cookie...
2080          */
2081         initack_limit = offset + cookie_len;
2082
2083         /*
2084          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2085          * and popluate
2086          */
2087
2088         /*
2089          * Here we do a trick, we set in NULL for the proc/thread argument.
2090          * We do this since in effect we only use the p argument when the
2091          * socket is unbound and we must do an implicit bind. Since we are
2092          * getting a cookie, we cannot be unbound.
2093          */
2094         stcb = sctp_aloc_assoc(inp, init_src, &error,
2095             ntohl(initack_cp->init.initiate_tag), vrf_id,
2096             (struct thread *)NULL
2097             );
2098         if (stcb == NULL) {
2099                 struct mbuf *op_err;
2100
2101                 /* memory problem? */
2102                 SCTPDBG(SCTP_DEBUG_INPUT1,
2103                     "process_cookie_new: no room for another TCB!\n");
2104                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2105                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2106                     src, dst, sh, op_err,
2107                     use_mflowid, mflowid,
2108                     vrf_id, port);
2109                 return (NULL);
2110         }
2111         /* get the correct sctp_nets */
2112         if (netp)
2113                 *netp = sctp_findnet(stcb, init_src);
2114
2115         asoc = &stcb->asoc;
2116         /* get scope variables out of cookie */
2117         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2118         asoc->scope.site_scope = cookie->site_scope;
2119         asoc->scope.local_scope = cookie->local_scope;
2120         asoc->scope.loopback_scope = cookie->loopback_scope;
2121
2122         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2123             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2124                 struct mbuf *op_err;
2125
2126                 /*
2127                  * Houston we have a problem. The EP changed while the
2128                  * cookie was in flight. Only recourse is to abort the
2129                  * association.
2130                  */
2131                 atomic_add_int(&stcb->asoc.refcnt, 1);
2132                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2133                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2134                     src, dst, sh, op_err,
2135                     use_mflowid, mflowid,
2136                     vrf_id, port);
2137 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2138                 SCTP_TCB_UNLOCK(stcb);
2139                 SCTP_SOCKET_LOCK(so, 1);
2140                 SCTP_TCB_LOCK(stcb);
2141 #endif
2142                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2143                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2144 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2145                 SCTP_SOCKET_UNLOCK(so, 1);
2146 #endif
2147                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2148                 return (NULL);
2149         }
2150         /* process the INIT-ACK info (my info) */
2151         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2152         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2153         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2154         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2155         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2156         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2157         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2158         asoc->str_reset_seq_in = asoc->init_seq_number;
2159
2160         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2161
2162         /* process the INIT info (peer's info) */
2163         if (netp)
2164                 retval = sctp_process_init(init_cp, stcb);
2165         else
2166                 retval = 0;
2167         if (retval < 0) {
2168                 atomic_add_int(&stcb->asoc.refcnt, 1);
2169 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2170                 SCTP_TCB_UNLOCK(stcb);
2171                 SCTP_SOCKET_LOCK(so, 1);
2172                 SCTP_TCB_LOCK(stcb);
2173 #endif
2174                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2175 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2176                 SCTP_SOCKET_UNLOCK(so, 1);
2177 #endif
2178                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2179                 return (NULL);
2180         }
2181         /* load all addresses */
2182         if (sctp_load_addresses_from_init(stcb, m,
2183             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2184             src, dst, init_src)) {
2185                 atomic_add_int(&stcb->asoc.refcnt, 1);
2186 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2187                 SCTP_TCB_UNLOCK(stcb);
2188                 SCTP_SOCKET_LOCK(so, 1);
2189                 SCTP_TCB_LOCK(stcb);
2190 #endif
2191                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2192 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2193                 SCTP_SOCKET_UNLOCK(so, 1);
2194 #endif
2195                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2196                 return (NULL);
2197         }
2198         /*
2199          * verify any preceding AUTH chunk that was skipped
2200          */
2201         /* pull the local authentication parameters from the cookie/init-ack */
2202         sctp_auth_get_cookie_params(stcb, m,
2203             initack_offset + sizeof(struct sctp_init_ack_chunk),
2204             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2205         if (auth_skipped) {
2206                 struct sctp_auth_chunk *auth;
2207
2208                 auth = (struct sctp_auth_chunk *)
2209                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2210                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2211                         /* auth HMAC failed, dump the assoc and packet */
2212                         SCTPDBG(SCTP_DEBUG_AUTH1,
2213                             "COOKIE-ECHO: AUTH failed\n");
2214                         atomic_add_int(&stcb->asoc.refcnt, 1);
2215 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2216                         SCTP_TCB_UNLOCK(stcb);
2217                         SCTP_SOCKET_LOCK(so, 1);
2218                         SCTP_TCB_LOCK(stcb);
2219 #endif
2220                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2221 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2222                         SCTP_SOCKET_UNLOCK(so, 1);
2223 #endif
2224                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2225                         return (NULL);
2226                 } else {
2227                         /* remaining chunks checked... good to go */
2228                         stcb->asoc.authenticated = 1;
2229                 }
2230         }
2231         /* update current state */
2232         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2233         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2234         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2235                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2236                     stcb->sctp_ep, stcb, asoc->primary_destination);
2237         }
2238         sctp_stop_all_cookie_timers(stcb);
2239         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2240         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2241
2242         /*
2243          * if we're doing ASCONFs, check to see if we have any new local
2244          * addresses that need to get added to the peer (eg. addresses
2245          * changed while cookie echo in flight).  This needs to be done
2246          * after we go to the OPEN state to do the correct asconf
2247          * processing. else, make sure we have the correct addresses in our
2248          * lists
2249          */
2250
2251         /* warning, we re-use sin, sin6, sa_store here! */
2252         /* pull in local_address (our "from" address) */
2253         switch (cookie->laddr_type) {
2254 #ifdef INET
2255         case SCTP_IPV4_ADDRESS:
2256                 /* source addr is IPv4 */
2257                 sin = (struct sockaddr_in *)initack_src;
2258                 memset(sin, 0, sizeof(*sin));
2259                 sin->sin_family = AF_INET;
2260                 sin->sin_len = sizeof(struct sockaddr_in);
2261                 sin->sin_addr.s_addr = cookie->laddress[0];
2262                 break;
2263 #endif
2264 #ifdef INET6
2265         case SCTP_IPV6_ADDRESS:
2266                 /* source addr is IPv6 */
2267                 sin6 = (struct sockaddr_in6 *)initack_src;
2268                 memset(sin6, 0, sizeof(*sin6));
2269                 sin6->sin6_family = AF_INET6;
2270                 sin6->sin6_len = sizeof(struct sockaddr_in6);
2271                 sin6->sin6_scope_id = cookie->scope_id;
2272                 memcpy(&sin6->sin6_addr, cookie->laddress,
2273                     sizeof(sin6->sin6_addr));
2274                 break;
2275 #endif
2276         default:
2277                 atomic_add_int(&stcb->asoc.refcnt, 1);
2278 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2279                 SCTP_TCB_UNLOCK(stcb);
2280                 SCTP_SOCKET_LOCK(so, 1);
2281                 SCTP_TCB_LOCK(stcb);
2282 #endif
2283                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2284 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2285                 SCTP_SOCKET_UNLOCK(so, 1);
2286 #endif
2287                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2288                 return (NULL);
2289         }
2290
2291         /* set up to notify upper layer */
2292         *notification = SCTP_NOTIFY_ASSOC_UP;
2293         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2294             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2295             (inp->sctp_socket->so_qlimit == 0)) {
2296                 /*
2297                  * This is an endpoint that called connect() how it got a
2298                  * cookie that is NEW is a bit of a mystery. It must be that
2299                  * the INIT was sent, but before it got there.. a complete
2300                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2301                  * should have went to the other code.. not here.. oh well..
2302                  * a bit of protection is worth having..
2303                  */
2304                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2305 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2306                 atomic_add_int(&stcb->asoc.refcnt, 1);
2307                 SCTP_TCB_UNLOCK(stcb);
2308                 SCTP_SOCKET_LOCK(so, 1);
2309                 SCTP_TCB_LOCK(stcb);
2310                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2311                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2312                         SCTP_SOCKET_UNLOCK(so, 1);
2313                         return (NULL);
2314                 }
2315 #endif
2316                 soisconnected(stcb->sctp_socket);
2317 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2318                 SCTP_SOCKET_UNLOCK(so, 1);
2319 #endif
2320         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2321             (inp->sctp_socket->so_qlimit)) {
2322                 /*
2323                  * We don't want to do anything with this one. Since it is
2324                  * the listening guy. The timer will get started for
2325                  * accepted connections in the caller.
2326                  */
2327                 ;
2328         }
2329         /* since we did not send a HB make sure we don't double things */
2330         if ((netp) && (*netp))
2331                 (*netp)->hb_responded = 1;
2332
2333         if (stcb->asoc.sctp_autoclose_ticks &&
2334             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2335                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2336         }
2337         /* calculate the RTT */
2338         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2339         if ((netp) && (*netp)) {
2340                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2341                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2342                     SCTP_RTT_FROM_NON_DATA);
2343         }
2344         /* respond with a COOKIE-ACK */
2345         sctp_send_cookie_ack(stcb);
2346
2347         /*
2348          * check the address lists for any ASCONFs that need to be sent
2349          * AFTER the cookie-ack is sent
2350          */
2351         sctp_check_address_list(stcb, m,
2352             initack_offset + sizeof(struct sctp_init_ack_chunk),
2353             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2354             initack_src, cookie->local_scope, cookie->site_scope,
2355             cookie->ipv4_scope, cookie->loopback_scope);
2356
2357
2358         return (stcb);
2359 }
2360
2361 /*
2362  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2363  * we NEED to make sure we are not already using the vtag. If so we
2364  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2365         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2366                                                             SCTP_BASE_INFO(hashasocmark))];
2367         LIST_FOREACH(stcb, head, sctp_asocs) {
2368                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2369                        -- SEND ABORT - TRY AGAIN --
2370                 }
2371         }
2372 */
2373
2374 /*
2375  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2376  * existing (non-NULL) TCB
2377  */
2378 static struct mbuf *
2379 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2380     struct sockaddr *src, struct sockaddr *dst,
2381     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2382     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2383     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2384     struct sctp_tcb **locked_tcb,
2385     uint8_t use_mflowid, uint32_t mflowid,
2386     uint32_t vrf_id, uint16_t port)
2387 {
2388         struct sctp_state_cookie *cookie;
2389         struct sctp_tcb *l_stcb = *stcb;
2390         struct sctp_inpcb *l_inp;
2391         struct sockaddr *to;
2392         struct sctp_pcb *ep;
2393         struct mbuf *m_sig;
2394         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2395         uint8_t *sig;
2396         uint8_t cookie_ok = 0;
2397         unsigned int sig_offset, cookie_offset;
2398         unsigned int cookie_len;
2399         struct timeval now;
2400         struct timeval time_expires;
2401         int notification = 0;
2402         struct sctp_nets *netl;
2403         int had_a_existing_tcb = 0;
2404         int send_int_conf = 0;
2405
2406 #ifdef INET
2407         struct sockaddr_in sin;
2408
2409 #endif
2410 #ifdef INET6
2411         struct sockaddr_in6 sin6;
2412
2413 #endif
2414
2415         SCTPDBG(SCTP_DEBUG_INPUT2,
2416             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2417
2418         if (inp_p == NULL) {
2419                 return (NULL);
2420         }
2421         cookie = &cp->cookie;
2422         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2423         cookie_len = ntohs(cp->ch.chunk_length);
2424
2425         if ((cookie->peerport != sh->src_port) &&
2426             (cookie->myport != sh->dest_port) &&
2427             (cookie->my_vtag != sh->v_tag)) {
2428                 /*
2429                  * invalid ports or bad tag.  Note that we always leave the
2430                  * v_tag in the header in network order and when we stored
2431                  * it in the my_vtag slot we also left it in network order.
2432                  * This maintains the match even though it may be in the
2433                  * opposite byte order of the machine :->
2434                  */
2435                 return (NULL);
2436         }
2437         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2438             sizeof(struct sctp_init_chunk) +
2439             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2440                 /* cookie too small */
2441                 return (NULL);
2442         }
2443         /*
2444          * split off the signature into its own mbuf (since it should not be
2445          * calculated in the sctp_hmac_m() call).
2446          */
2447         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2448         m_sig = m_split(m, sig_offset, M_NOWAIT);
2449         if (m_sig == NULL) {
2450                 /* out of memory or ?? */
2451                 return (NULL);
2452         }
2453 #ifdef SCTP_MBUF_LOGGING
2454         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2455                 struct mbuf *mat;
2456
2457                 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) {
2458                         if (SCTP_BUF_IS_EXTENDED(mat)) {
2459                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2460                         }
2461                 }
2462         }
2463 #endif
2464
2465         /*
2466          * compute the signature/digest for the cookie
2467          */
2468         ep = &(*inp_p)->sctp_ep;
2469         l_inp = *inp_p;
2470         if (l_stcb) {
2471                 SCTP_TCB_UNLOCK(l_stcb);
2472         }
2473         SCTP_INP_RLOCK(l_inp);
2474         if (l_stcb) {
2475                 SCTP_TCB_LOCK(l_stcb);
2476         }
2477         /* which cookie is it? */
2478         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2479             (ep->current_secret_number != ep->last_secret_number)) {
2480                 /* it's the old cookie */
2481                 (void)sctp_hmac_m(SCTP_HMAC,
2482                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2483                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2484         } else {
2485                 /* it's the current cookie */
2486                 (void)sctp_hmac_m(SCTP_HMAC,
2487                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2488                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2489         }
2490         /* get the signature */
2491         SCTP_INP_RUNLOCK(l_inp);
2492         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2493         if (sig == NULL) {
2494                 /* couldn't find signature */
2495                 sctp_m_freem(m_sig);
2496                 return (NULL);
2497         }
2498         /* compare the received digest with the computed digest */
2499         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2500                 /* try the old cookie? */
2501                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2502                     (ep->current_secret_number != ep->last_secret_number)) {
2503                         /* compute digest with old */
2504                         (void)sctp_hmac_m(SCTP_HMAC,
2505                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2506                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2507                         /* compare */
2508                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2509                                 cookie_ok = 1;
2510                 }
2511         } else {
2512                 cookie_ok = 1;
2513         }
2514
2515         /*
2516          * Now before we continue we must reconstruct our mbuf so that
2517          * normal processing of any other chunks will work.
2518          */
2519         {
2520                 struct mbuf *m_at;
2521
2522                 m_at = m;
2523                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2524                         m_at = SCTP_BUF_NEXT(m_at);
2525                 }
2526                 SCTP_BUF_NEXT(m_at) = m_sig;
2527         }
2528
2529         if (cookie_ok == 0) {
2530                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2531                 SCTPDBG(SCTP_DEBUG_INPUT2,
2532                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2533                     (uint32_t) offset, cookie_offset, sig_offset);
2534                 return (NULL);
2535         }
2536         /*
2537          * check the cookie timestamps to be sure it's not stale
2538          */
2539         (void)SCTP_GETTIME_TIMEVAL(&now);
2540         /* Expire time is in Ticks, so we convert to seconds */
2541         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2542         time_expires.tv_usec = cookie->time_entered.tv_usec;
2543         /*
2544          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2545          * is undefined.
2546          */
2547         if (timevalcmp(&now, &time_expires, >)) {
2548                 /* cookie is stale! */
2549                 struct mbuf *op_err;
2550                 struct sctp_stale_cookie_msg *scm;
2551                 uint32_t tim;
2552
2553                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2554                     0, M_NOWAIT, 1, MT_DATA);
2555                 if (op_err == NULL) {
2556                         /* FOOBAR */
2557                         return (NULL);
2558                 }
2559                 /* Set the len */
2560                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2561                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2562                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2563                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2564                     (sizeof(uint32_t))));
2565                 /* seconds to usec */
2566                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2567                 /* add in usec */
2568                 if (tim == 0)
2569                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2570                 scm->time_usec = htonl(tim);
2571                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2572                     use_mflowid, mflowid,
2573                     vrf_id, port);
2574                 return (NULL);
2575         }
2576         /*
2577          * Now we must see with the lookup address if we have an existing
2578          * asoc. This will only happen if we were in the COOKIE-WAIT state
2579          * and a INIT collided with us and somewhere the peer sent the
2580          * cookie on another address besides the single address our assoc
2581          * had for him. In this case we will have one of the tie-tags set at
2582          * least AND the address field in the cookie can be used to look it
2583          * up.
2584          */
2585         to = NULL;
2586         switch (cookie->addr_type) {
2587 #ifdef INET6
2588         case SCTP_IPV6_ADDRESS:
2589                 memset(&sin6, 0, sizeof(sin6));
2590                 sin6.sin6_family = AF_INET6;
2591                 sin6.sin6_len = sizeof(sin6);
2592                 sin6.sin6_port = sh->src_port;
2593                 sin6.sin6_scope_id = cookie->scope_id;
2594                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2595                     sizeof(sin6.sin6_addr.s6_addr));
2596                 to = (struct sockaddr *)&sin6;
2597                 break;
2598 #endif
2599 #ifdef INET
2600         case SCTP_IPV4_ADDRESS:
2601                 memset(&sin, 0, sizeof(sin));
2602                 sin.sin_family = AF_INET;
2603                 sin.sin_len = sizeof(sin);
2604                 sin.sin_port = sh->src_port;
2605                 sin.sin_addr.s_addr = cookie->address[0];
2606                 to = (struct sockaddr *)&sin;
2607                 break;
2608 #endif
2609         default:
2610                 /* This should not happen */
2611                 return (NULL);
2612         }
2613         if ((*stcb == NULL) && to) {
2614                 /* Yep, lets check */
2615                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2616                 if (*stcb == NULL) {
2617                         /*
2618                          * We should have only got back the same inp. If we
2619                          * got back a different ep we have a problem. The
2620                          * original findep got back l_inp and now
2621                          */
2622                         if (l_inp != *inp_p) {
2623                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2624                         }
2625                 } else {
2626                         if (*locked_tcb == NULL) {
2627                                 /*
2628                                  * In this case we found the assoc only
2629                                  * after we locked the create lock. This
2630                                  * means we are in a colliding case and we
2631                                  * must make sure that we unlock the tcb if
2632                                  * its one of the cases where we throw away
2633                                  * the incoming packets.
2634                                  */
2635                                 *locked_tcb = *stcb;
2636
2637                                 /*
2638                                  * We must also increment the inp ref count
2639                                  * since the ref_count flags was set when we
2640                                  * did not find the TCB, now we found it
2641                                  * which reduces the refcount.. we must
2642                                  * raise it back out to balance it all :-)
2643                                  */
2644                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2645                                 if ((*stcb)->sctp_ep != l_inp) {
2646                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2647                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2648                                 }
2649                         }
2650                 }
2651         }
2652         if (to == NULL) {
2653                 return (NULL);
2654         }
2655         cookie_len -= SCTP_SIGNATURE_SIZE;
2656         if (*stcb == NULL) {
2657                 /* this is the "normal" case... get a new TCB */
2658                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2659                     cookie, cookie_len, *inp_p,
2660                     netp, to, &notification,
2661                     auth_skipped, auth_offset, auth_len,
2662                     use_mflowid, mflowid,
2663                     vrf_id, port);
2664         } else {
2665                 /* this is abnormal... cookie-echo on existing TCB */
2666                 had_a_existing_tcb = 1;
2667                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2668                     src, dst, sh,
2669                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2670                     &notification, auth_skipped, auth_offset, auth_len,
2671                     use_mflowid, mflowid,
2672                     vrf_id, port);
2673         }
2674
2675         if (*stcb == NULL) {
2676                 /* still no TCB... must be bad cookie-echo */
2677                 return (NULL);
2678         }
2679         if ((*netp != NULL) && (use_mflowid != 0)) {
2680                 (*netp)->flowid = mflowid;
2681 #ifdef INVARIANTS
2682                 (*netp)->flowidset = 1;
2683 #endif
2684         }
2685         /*
2686          * Ok, we built an association so confirm the address we sent the
2687          * INIT-ACK to.
2688          */
2689         netl = sctp_findnet(*stcb, to);
2690         /*
2691          * This code should in theory NOT run but
2692          */
2693         if (netl == NULL) {
2694                 /* TSNH! Huh, why do I need to add this address here? */
2695                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2696                         return (NULL);
2697                 }
2698                 netl = sctp_findnet(*stcb, to);
2699         }
2700         if (netl) {
2701                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2702                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2703                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2704                             netl);
2705                         send_int_conf = 1;
2706                 }
2707         }
2708         sctp_start_net_timers(*stcb);
2709         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2710                 if (!had_a_existing_tcb ||
2711                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2712                         /*
2713                          * If we have a NEW cookie or the connect never
2714                          * reached the connected state during collision we
2715                          * must do the TCP accept thing.
2716                          */
2717                         struct socket *so, *oso;
2718                         struct sctp_inpcb *inp;
2719
2720                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2721                                 /*
2722                                  * For a restart we will keep the same
2723                                  * socket, no need to do anything. I THINK!!
2724                                  */
2725                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2726                                 if (send_int_conf) {
2727                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2728                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2729                                 }
2730                                 return (m);
2731                         }
2732                         oso = (*inp_p)->sctp_socket;
2733                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2734                         SCTP_TCB_UNLOCK((*stcb));
2735                         CURVNET_SET(oso->so_vnet);
2736                         so = sonewconn(oso, 0
2737                             );
2738                         CURVNET_RESTORE();
2739                         SCTP_TCB_LOCK((*stcb));
2740                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2741
2742                         if (so == NULL) {
2743                                 struct mbuf *op_err;
2744
2745 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2746                                 struct socket *pcb_so;
2747
2748 #endif
2749                                 /* Too many sockets */
2750                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2751                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2752                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2753                                     src, dst, sh, op_err,
2754                                     use_mflowid, mflowid,
2755                                     vrf_id, port);
2756 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2757                                 pcb_so = SCTP_INP_SO(*inp_p);
2758                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2759                                 SCTP_TCB_UNLOCK((*stcb));
2760                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2761                                 SCTP_TCB_LOCK((*stcb));
2762                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2763 #endif
2764                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2765 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2766                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2767 #endif
2768                                 return (NULL);
2769                         }
2770                         inp = (struct sctp_inpcb *)so->so_pcb;
2771                         SCTP_INP_INCR_REF(inp);
2772                         /*
2773                          * We add the unbound flag here so that if we get an
2774                          * soabort() before we get the move_pcb done, we
2775                          * will properly cleanup.
2776                          */
2777                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2778                             SCTP_PCB_FLAGS_CONNECTED |
2779                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2780                             SCTP_PCB_FLAGS_UNBOUND |
2781                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2782                             SCTP_PCB_FLAGS_DONT_WAKE);
2783                         inp->sctp_features = (*inp_p)->sctp_features;
2784                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2785                         inp->sctp_socket = so;
2786                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2787                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2788                         inp->ecn_supported = (*inp_p)->ecn_supported;
2789                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2790                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2791                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2792                         inp->sctp_context = (*inp_p)->sctp_context;
2793                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2794                         inp->inp_starting_point_for_iterator = NULL;
2795                         /*
2796                          * copy in the authentication parameters from the
2797                          * original endpoint
2798                          */
2799                         if (inp->sctp_ep.local_hmacs)
2800                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2801                         inp->sctp_ep.local_hmacs =
2802                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2803                         if (inp->sctp_ep.local_auth_chunks)
2804                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2805                         inp->sctp_ep.local_auth_chunks =
2806                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2807
2808                         /*
2809                          * Now we must move it from one hash table to
2810                          * another and get the tcb in the right place.
2811                          */
2812
2813                         /*
2814                          * This is where the one-2-one socket is put into
2815                          * the accept state waiting for the accept!
2816                          */
2817                         if (*stcb) {
2818                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2819                         }
2820                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2821
2822                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2823                         SCTP_TCB_UNLOCK((*stcb));
2824
2825                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2826                             0);
2827                         SCTP_TCB_LOCK((*stcb));
2828                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2829
2830
2831                         /*
2832                          * now we must check to see if we were aborted while
2833                          * the move was going on and the lock/unlock
2834                          * happened.
2835                          */
2836                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2837                                 /*
2838                                  * yep it was, we leave the assoc attached
2839                                  * to the socket since the sctp_inpcb_free()
2840                                  * call will send an abort for us.
2841                                  */
2842                                 SCTP_INP_DECR_REF(inp);
2843                                 return (NULL);
2844                         }
2845                         SCTP_INP_DECR_REF(inp);
2846                         /* Switch over to the new guy */
2847                         *inp_p = inp;
2848                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2849                         if (send_int_conf) {
2850                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2851                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2852                         }
2853                         /*
2854                          * Pull it from the incomplete queue and wake the
2855                          * guy
2856                          */
2857 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2858                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2859                         SCTP_TCB_UNLOCK((*stcb));
2860                         SCTP_SOCKET_LOCK(so, 1);
2861 #endif
2862                         soisconnected(so);
2863 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2864                         SCTP_TCB_LOCK((*stcb));
2865                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2866                         SCTP_SOCKET_UNLOCK(so, 1);
2867 #endif
2868                         return (m);
2869                 }
2870         }
2871         if (notification) {
2872                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2873         }
2874         if (send_int_conf) {
2875                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2876                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2877         }
2878         return (m);
2879 }
2880
2881 static void
2882 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2883     struct sctp_tcb *stcb, struct sctp_nets *net)
2884 {
2885         /* cp must not be used, others call this without a c-ack :-) */
2886         struct sctp_association *asoc;
2887
2888         SCTPDBG(SCTP_DEBUG_INPUT2,
2889             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2890         if (stcb == NULL)
2891                 return;
2892
2893         asoc = &stcb->asoc;
2894
2895         sctp_stop_all_cookie_timers(stcb);
2896         /* process according to association state */
2897         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2898                 /* state change only needed when I am in right state */
2899                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2900                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2901                 sctp_start_net_timers(stcb);
2902                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2903                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2904                             stcb->sctp_ep, stcb, asoc->primary_destination);
2905
2906                 }
2907                 /* update RTO */
2908                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2909                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2910                 if (asoc->overall_error_count == 0) {
2911                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2912                             &asoc->time_entered, sctp_align_safe_nocopy,
2913                             SCTP_RTT_FROM_NON_DATA);
2914                 }
2915                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2916                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2917                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2918                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2919 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2920                         struct socket *so;
2921
2922 #endif
2923                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2924 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2925                         so = SCTP_INP_SO(stcb->sctp_ep);
2926                         atomic_add_int(&stcb->asoc.refcnt, 1);
2927                         SCTP_TCB_UNLOCK(stcb);
2928                         SCTP_SOCKET_LOCK(so, 1);
2929                         SCTP_TCB_LOCK(stcb);
2930                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2931 #endif
2932                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2933                                 soisconnected(stcb->sctp_socket);
2934                         }
2935 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2936                         SCTP_SOCKET_UNLOCK(so, 1);
2937 #endif
2938                 }
2939                 /*
2940                  * since we did not send a HB make sure we don't double
2941                  * things
2942                  */
2943                 net->hb_responded = 1;
2944
2945                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2946                         /*
2947                          * We don't need to do the asconf thing, nor hb or
2948                          * autoclose if the socket is closed.
2949                          */
2950                         goto closed_socket;
2951                 }
2952                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2953                     stcb, net);
2954
2955
2956                 if (stcb->asoc.sctp_autoclose_ticks &&
2957                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2958                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2959                             stcb->sctp_ep, stcb, NULL);
2960                 }
2961                 /*
2962                  * send ASCONF if parameters are pending and ASCONFs are
2963                  * allowed (eg. addresses changed when init/cookie echo were
2964                  * in flight)
2965                  */
2966                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2967                     (stcb->asoc.peer_supports_asconf) &&
2968                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2969 #ifdef SCTP_TIMER_BASED_ASCONF
2970                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2971                             stcb->sctp_ep, stcb,
2972                             stcb->asoc.primary_destination);
2973 #else
2974                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2975                             SCTP_ADDR_NOT_LOCKED);
2976 #endif
2977                 }
2978         }
2979 closed_socket:
2980         /* Toss the cookie if I can */
2981         sctp_toss_old_cookies(stcb, asoc);
2982         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2983                 /* Restart the timer if we have pending data */
2984                 struct sctp_tmit_chunk *chk;
2985
2986                 chk = TAILQ_FIRST(&asoc->sent_queue);
2987                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2988         }
2989 }
2990
2991 static void
2992 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2993     struct sctp_tcb *stcb)
2994 {
2995         struct sctp_nets *net;
2996         struct sctp_tmit_chunk *lchk;
2997         struct sctp_ecne_chunk bkup;
2998         uint8_t override_bit;
2999         uint32_t tsn, window_data_tsn;
3000         int len;
3001         unsigned int pkt_cnt;
3002
3003         len = ntohs(cp->ch.chunk_length);
3004         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3005             (len != sizeof(struct old_sctp_ecne_chunk))) {
3006                 return;
3007         }
3008         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3009                 /* Its the old format */
3010                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3011                 bkup.num_pkts_since_cwr = htonl(1);
3012                 cp = &bkup;
3013         }
3014         SCTP_STAT_INCR(sctps_recvecne);
3015         tsn = ntohl(cp->tsn);
3016         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3017         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3018         if (lchk == NULL) {
3019                 window_data_tsn = stcb->asoc.sending_seq - 1;
3020         } else {
3021                 window_data_tsn = lchk->rec.data.TSN_seq;
3022         }
3023
3024         /* Find where it was sent to if possible. */
3025         net = NULL;
3026         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3027                 if (lchk->rec.data.TSN_seq == tsn) {
3028                         net = lchk->whoTo;
3029                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3030                         break;
3031                 }
3032                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3033                         break;
3034                 }
3035         }
3036         if (net == NULL) {
3037                 /*
3038                  * What to do. A previous send of a CWR was possibly lost.
3039                  * See how old it is, we may have it marked on the actual
3040                  * net.
3041                  */
3042                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3043                         if (tsn == net->last_cwr_tsn) {
3044                                 /* Found him, send it off */
3045                                 break;
3046                         }
3047                 }
3048                 if (net == NULL) {
3049                         /*
3050                          * If we reach here, we need to send a special CWR
3051                          * that says hey, we did this a long time ago and
3052                          * you lost the response.
3053                          */
3054                         net = TAILQ_FIRST(&stcb->asoc.nets);
3055                         if (net == NULL) {
3056                                 /* TSNH */
3057                                 return;
3058                         }
3059                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3060                 } else {
3061                         override_bit = 0;
3062                 }
3063         } else {
3064                 override_bit = 0;
3065         }
3066         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3067             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3068                 /*
3069                  * JRS - Use the congestion control given in the pluggable
3070                  * CC module
3071                  */
3072                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3073                 /*
3074                  * We reduce once every RTT. So we will only lower cwnd at
3075                  * the next sending seq i.e. the window_data_tsn
3076                  */
3077                 net->cwr_window_tsn = window_data_tsn;
3078                 net->ecn_ce_pkt_cnt += pkt_cnt;
3079                 net->lost_cnt = pkt_cnt;
3080                 net->last_cwr_tsn = tsn;
3081         } else {
3082                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3083                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3084                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3085                         /*
3086                          * Another loss in the same window update how many
3087                          * marks/packets lost we have had.
3088                          */
3089                         int cnt = 1;
3090
3091                         if (pkt_cnt > net->lost_cnt) {
3092                                 /* Should be the case */
3093                                 cnt = (pkt_cnt - net->lost_cnt);
3094                                 net->ecn_ce_pkt_cnt += cnt;
3095                         }
3096                         net->lost_cnt = pkt_cnt;
3097                         net->last_cwr_tsn = tsn;
3098                         /*
3099                          * Most CC functions will ignore this call, since we
3100                          * are in-window yet of the initial CE the peer saw.
3101                          */
3102                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3103                 }
3104         }
3105         /*
3106          * We always send a CWR this way if our previous one was lost our
3107          * peer will get an update, or if it is not time again to reduce we
3108          * still get the cwr to the peer. Note we set the override when we
3109          * could not find the TSN on the chunk or the destination network.
3110          */
3111         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3112 }
3113
3114 static void
3115 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3116 {
3117         /*
3118          * Here we get a CWR from the peer. We must look in the outqueue and
3119          * make sure that we have a covered ECNE in the control chunk part.
3120          * If so remove it.
3121          */
3122         struct sctp_tmit_chunk *chk;
3123         struct sctp_ecne_chunk *ecne;
3124         int override;
3125         uint32_t cwr_tsn;
3126
3127         cwr_tsn = ntohl(cp->tsn);
3128
3129         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3130         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3131                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3132                         continue;
3133                 }
3134                 if ((override == 0) && (chk->whoTo != net)) {
3135                         /* Must be from the right src unless override is set */
3136                         continue;
3137                 }
3138                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3139                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3140                         /* this covers this ECNE, we can remove it */
3141                         stcb->asoc.ecn_echo_cnt_onq--;
3142                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3143                             sctp_next);
3144                         if (chk->data) {
3145                                 sctp_m_freem(chk->data);
3146                                 chk->data = NULL;
3147                         }
3148                         stcb->asoc.ctrl_queue_cnt--;
3149                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3150                         if (override == 0) {
3151                                 break;
3152                         }
3153                 }
3154         }
3155 }
3156
3157 static void
3158 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3159     struct sctp_tcb *stcb, struct sctp_nets *net)
3160 {
3161         struct sctp_association *asoc;
3162
3163 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3164         struct socket *so;
3165
3166 #endif
3167
3168         SCTPDBG(SCTP_DEBUG_INPUT2,
3169             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3170         if (stcb == NULL)
3171                 return;
3172
3173         asoc = &stcb->asoc;
3174         /* process according to association state */
3175         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3176                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3177                 SCTPDBG(SCTP_DEBUG_INPUT2,
3178                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3179                 SCTP_TCB_UNLOCK(stcb);
3180                 return;
3181         }
3182         /* notify upper layer protocol */
3183         if (stcb->sctp_socket) {
3184                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3185         }
3186 #ifdef INVARIANTS
3187         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3188             !TAILQ_EMPTY(&asoc->sent_queue) ||
3189             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3190                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3191         }
3192 #endif
3193         /* stop the timer */
3194         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3195         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3196         /* free the TCB */
3197         SCTPDBG(SCTP_DEBUG_INPUT2,
3198             "sctp_handle_shutdown_complete: calls free-asoc\n");
3199 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3200         so = SCTP_INP_SO(stcb->sctp_ep);
3201         atomic_add_int(&stcb->asoc.refcnt, 1);
3202         SCTP_TCB_UNLOCK(stcb);
3203         SCTP_SOCKET_LOCK(so, 1);
3204         SCTP_TCB_LOCK(stcb);
3205         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3206 #endif
3207         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3208 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3209         SCTP_SOCKET_UNLOCK(so, 1);
3210 #endif
3211         return;
3212 }
3213
3214 static int
3215 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3216     struct sctp_nets *net, uint8_t flg)
3217 {
3218         switch (desc->chunk_type) {
3219         case SCTP_DATA:
3220                 /* find the tsn to resend (possibly */
3221                 {
3222                         uint32_t tsn;
3223                         struct sctp_tmit_chunk *tp1;
3224
3225                         tsn = ntohl(desc->tsn_ifany);
3226                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3227                                 if (tp1->rec.data.TSN_seq == tsn) {
3228                                         /* found it */
3229                                         break;
3230                                 }
3231                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3232                                         /* not found */
3233                                         tp1 = NULL;
3234                                         break;
3235                                 }
3236                         }
3237                         if (tp1 == NULL) {
3238                                 /*
3239                                  * Do it the other way , aka without paying
3240                                  * attention to queue seq order.
3241                                  */
3242                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3243                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3244                                         if (tp1->rec.data.TSN_seq == tsn) {
3245                                                 /* found it */
3246                                                 break;
3247                                         }
3248                                 }
3249                         }
3250                         if (tp1 == NULL) {
3251                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3252                         }
3253                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3254                                 uint8_t *ddp;
3255
3256                                 if (((flg & SCTP_BADCRC) == 0) &&
3257                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3258                                         return (0);
3259                                 }
3260                                 if ((stcb->asoc.peers_rwnd == 0) &&
3261                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3262                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3263                                         return (0);
3264                                 }
3265                                 if (stcb->asoc.peers_rwnd == 0 &&
3266                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3267                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3268                                         return (0);
3269                                 }
3270                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3271                                     sizeof(struct sctp_data_chunk));
3272                                 {
3273                                         unsigned int iii;
3274
3275                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3276                                             iii++) {
3277                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3278                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3279                                                         return (-1);
3280                                                 }
3281                                         }
3282                                 }
3283
3284                                 if (tp1->do_rtt) {
3285                                         /*
3286                                          * this guy had a RTO calculation
3287                                          * pending on it, cancel it
3288                                          */
3289                                         if (tp1->whoTo->rto_needed == 0) {
3290                                                 tp1->whoTo->rto_needed = 1;
3291                                         }
3292                                         tp1->do_rtt = 0;
3293                                 }
3294                                 SCTP_STAT_INCR(sctps_pdrpmark);
3295                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3296                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3297                                 /*
3298                                  * mark it as if we were doing a FR, since
3299                                  * we will be getting gap ack reports behind
3300                                  * the info from the router.
3301                                  */
3302                                 tp1->rec.data.doing_fast_retransmit = 1;
3303                                 /*
3304                                  * mark the tsn with what sequences can
3305                                  * cause a new FR.
3306                                  */
3307                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3308                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3309                                 } else {
3310                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3311                                 }
3312
3313                                 /* restart the timer */
3314                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3315                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3316                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3317                                     stcb, tp1->whoTo);
3318
3319                                 /* fix counts and things */
3320                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3321                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3322                                             tp1->whoTo->flight_size,
3323                                             tp1->book_size,
3324                                             (uintptr_t) stcb,
3325                                             tp1->rec.data.TSN_seq);
3326                                 }
3327                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3328                                         sctp_flight_size_decrease(tp1);
3329                                         sctp_total_flight_decrease(stcb, tp1);
3330                                 }
3331                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3332                         } {
3333                                 /* audit code */
3334                                 unsigned int audit;
3335
3336                                 audit = 0;
3337                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3338                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3339                                                 audit++;
3340                                 }
3341                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3342                                     sctp_next) {
3343                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3344                                                 audit++;
3345                                 }
3346                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3347                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3348                                             audit, stcb->asoc.sent_queue_retran_cnt);
3349 #ifndef SCTP_AUDITING_ENABLED
3350                                         stcb->asoc.sent_queue_retran_cnt = audit;
3351 #endif
3352                                 }
3353                         }
3354                 }
3355                 break;
3356         case SCTP_ASCONF:
3357                 {
3358                         struct sctp_tmit_chunk *asconf;
3359
3360                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3361                             sctp_next) {
3362                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3363                                         break;
3364                                 }
3365                         }
3366                         if (asconf) {
3367                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3368                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3369                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3370                                 asconf->snd_count--;
3371                         }
3372                 }
3373                 break;
3374         case SCTP_INITIATION:
3375                 /* resend the INIT */
3376                 stcb->asoc.dropped_special_cnt++;
3377                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3378                         /*
3379                          * If we can get it in, in a few attempts we do
3380                          * this, otherwise we let the timer fire.
3381                          */
3382                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3383                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3384                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3385                 }
3386                 break;
3387         case SCTP_SELECTIVE_ACK:
3388         case SCTP_NR_SELECTIVE_ACK:
3389                 /* resend the sack */
3390                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3391                 break;
3392         case SCTP_HEARTBEAT_REQUEST:
3393                 /* resend a demand HB */
3394                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3395                         /*
3396                          * Only retransmit if we KNOW we wont destroy the
3397                          * tcb
3398                          */
3399                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3400                 }
3401                 break;
3402         case SCTP_SHUTDOWN:
3403                 sctp_send_shutdown(stcb, net);
3404                 break;
3405         case SCTP_SHUTDOWN_ACK:
3406                 sctp_send_shutdown_ack(stcb, net);
3407                 break;
3408         case SCTP_COOKIE_ECHO:
3409                 {
3410                         struct sctp_tmit_chunk *cookie;
3411
3412                         cookie = NULL;
3413                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3414                             sctp_next) {
3415                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3416                                         break;
3417                                 }
3418                         }
3419                         if (cookie) {
3420                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3421                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3422                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3423                                 sctp_stop_all_cookie_timers(stcb);
3424                         }
3425                 }
3426                 break;
3427         case SCTP_COOKIE_ACK:
3428                 sctp_send_cookie_ack(stcb);
3429                 break;
3430         case SCTP_ASCONF_ACK:
3431                 /* resend last asconf ack */
3432                 sctp_send_asconf_ack(stcb);
3433                 break;
3434         case SCTP_FORWARD_CUM_TSN:
3435                 send_forward_tsn(stcb, &stcb->asoc);
3436                 break;
3437                 /* can't do anything with these */
3438         case SCTP_PACKET_DROPPED:
3439         case SCTP_INITIATION_ACK:       /* this should not happen */
3440         case SCTP_HEARTBEAT_ACK:
3441         case SCTP_ABORT_ASSOCIATION:
3442         case SCTP_OPERATION_ERROR:
3443         case SCTP_SHUTDOWN_COMPLETE:
3444         case SCTP_ECN_ECHO:
3445         case SCTP_ECN_CWR:
3446         default:
3447                 break;
3448         }
3449         return (0);
3450 }
3451
3452 void
3453 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3454 {
3455         uint32_t i;
3456         uint16_t temp;
3457
3458         /*
3459          * We set things to 0xffff since this is the last delivered sequence
3460          * and we will be sending in 0 after the reset.
3461          */
3462
3463         if (number_entries) {
3464                 for (i = 0; i < number_entries; i++) {
3465                         temp = ntohs(list[i]);
3466                         if (temp >= stcb->asoc.streamincnt) {
3467                                 continue;
3468                         }
3469                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3470                 }
3471         } else {
3472                 list = NULL;
3473                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3474                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3475                 }
3476         }
3477         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3478 }
3479
3480 static void
3481 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3482 {
3483         uint32_t i;
3484         uint16_t temp;
3485
3486         if (number_entries > 0) {
3487                 for (i = 0; i < number_entries; i++) {
3488                         temp = ntohs(list[i]);
3489                         if (temp >= stcb->asoc.streamoutcnt) {
3490                                 /* no such stream */
3491                                 continue;
3492                         }
3493                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3494                 }
3495         } else {
3496                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3497                         stcb->asoc.strmout[i].next_sequence_send = 0;
3498                 }
3499         }
3500         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3501 }
3502
3503
3504 struct sctp_stream_reset_out_request *
3505 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3506 {
3507         struct sctp_association *asoc;
3508         struct sctp_chunkhdr *ch;
3509         struct sctp_stream_reset_out_request *r;
3510         struct sctp_tmit_chunk *chk;
3511         int len, clen;
3512
3513         asoc = &stcb->asoc;
3514         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3515                 asoc->stream_reset_outstanding = 0;
3516                 return (NULL);
3517         }
3518         if (stcb->asoc.str_reset == NULL) {
3519                 asoc->stream_reset_outstanding = 0;
3520                 return (NULL);
3521         }
3522         chk = stcb->asoc.str_reset;
3523         if (chk->data == NULL) {
3524                 return (NULL);
3525         }
3526         if (bchk) {
3527                 /* he wants a copy of the chk pointer */
3528                 *bchk = chk;
3529         }
3530         clen = chk->send_size;
3531         ch = mtod(chk->data, struct sctp_chunkhdr *);
3532         r = (struct sctp_stream_reset_out_request *)(ch + 1);
3533         if (ntohl(r->request_seq) == seq) {
3534                 /* found it */
3535                 return (r);
3536         }
3537         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3538         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3539                 /* move to the next one, there can only be a max of two */
3540                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3541                 if (ntohl(r->request_seq) == seq) {
3542                         return (r);
3543                 }
3544         }
3545         /* that seq is not here */
3546         return (NULL);
3547 }
3548
3549 static void
3550 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3551 {
3552         struct sctp_association *asoc;
3553         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3554
3555         if (stcb->asoc.str_reset == NULL) {
3556                 return;
3557         }
3558         asoc = &stcb->asoc;
3559
3560         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3561         TAILQ_REMOVE(&asoc->control_send_queue,
3562             chk,
3563             sctp_next);
3564         if (chk->data) {
3565                 sctp_m_freem(chk->data);
3566                 chk->data = NULL;
3567         }
3568         asoc->ctrl_queue_cnt--;
3569         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3570         /* sa_ignore NO_NULL_CHK */
3571         stcb->asoc.str_reset = NULL;
3572 }
3573
3574
3575 static int
3576 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3577     uint32_t seq, uint32_t action,
3578     struct sctp_stream_reset_response *respin)
3579 {
3580         uint16_t type;
3581         int lparm_len;
3582         struct sctp_association *asoc = &stcb->asoc;
3583         struct sctp_tmit_chunk *chk;
3584         struct sctp_stream_reset_out_request *srparam;
3585         uint32_t number_entries;
3586
3587         if (asoc->stream_reset_outstanding == 0) {
3588                 /* duplicate */
3589                 return (0);
3590         }
3591         if (seq == stcb->asoc.str_reset_seq_out) {
3592                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3593                 if (srparam) {
3594                         stcb->asoc.str_reset_seq_out++;
3595                         type = ntohs(srparam->ph.param_type);
3596                         lparm_len = ntohs(srparam->ph.param_length);
3597                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3598                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3599                                 asoc->stream_reset_out_is_outstanding = 0;
3600                                 if (asoc->stream_reset_outstanding)
3601                                         asoc->stream_reset_outstanding--;
3602                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3603                                         /* do it */
3604                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3605                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3606                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3607                                 } else {
3608                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3609                                 }
3610                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3611                                 /* Answered my request */
3612                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3613                                 if (asoc->stream_reset_outstanding)
3614                                         asoc->stream_reset_outstanding--;
3615                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3616                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3617                                             number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3618                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3619                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3620                                             number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3621                                 }
3622                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3623                                 /* Ok we now may have more streams */
3624                                 int num_stream;
3625
3626                                 num_stream = stcb->asoc.strm_pending_add_size;
3627                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3628                                         /* TSNH */
3629                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3630                                 }
3631                                 stcb->asoc.strm_pending_add_size = 0;
3632                                 if (asoc->stream_reset_outstanding)
3633                                         asoc->stream_reset_outstanding--;
3634                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3635                                         /* Put the new streams into effect */
3636                                         stcb->asoc.streamoutcnt += num_stream;
3637                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3638                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3639                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3640                                             SCTP_STREAM_CHANGE_DENIED);
3641                                 } else {
3642                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3643                                             SCTP_STREAM_CHANGE_FAILED);
3644                                 }
3645                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3646                                 if (asoc->stream_reset_outstanding)
3647                                         asoc->stream_reset_outstanding--;
3648                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3649                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3650                                             SCTP_STREAM_CHANGE_DENIED);
3651                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3652                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3653                                             SCTP_STREAM_CHANGE_FAILED);
3654                                 }
3655                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3656                                 /**
3657                                  * a) Adopt the new in tsn.
3658                                  * b) reset the map
3659                                  * c) Adopt the new out-tsn
3660                                  */
3661                                 struct sctp_stream_reset_response_tsn *resp;
3662                                 struct sctp_forward_tsn_chunk fwdtsn;
3663                                 int abort_flag = 0;
3664
3665                                 if (respin == NULL) {
3666                                         /* huh ? */
3667                                         return (0);
3668                                 }
3669                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3670                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3671                                         asoc->stream_reset_outstanding--;
3672                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3673                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3674                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3675                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3676                                         if (abort_flag) {
3677                                                 return (1);
3678                                         }
3679                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3680                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3681                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3682                                         }
3683                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3684                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3685                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3686
3687                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3688                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3689
3690                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3691                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3692
3693                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3694                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3695                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3696                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3697                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3698                                             SCTP_ASSOC_RESET_DENIED);
3699                                 } else {
3700                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3701                                             SCTP_ASSOC_RESET_FAILED);
3702                                 }
3703                         }
3704                         /* get rid of the request and get the request flags */
3705                         if (asoc->stream_reset_outstanding == 0) {
3706                                 sctp_clean_up_stream_reset(stcb);
3707                         }
3708                 }
3709         }
3710         return (0);
3711 }
3712
3713 static void
3714 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3715     struct sctp_tmit_chunk *chk,
3716     struct sctp_stream_reset_in_request *req, int trunc)
3717 {
3718         uint32_t seq;
3719         int len, i;
3720         int number_entries;
3721         uint16_t temp;
3722
3723         /*
3724          * peer wants me to send a str-reset to him for my outgoing seq's if
3725          * seq_in is right.
3726          */
3727         struct sctp_association *asoc = &stcb->asoc;
3728
3729         seq = ntohl(req->request_seq);
3730         if (asoc->str_reset_seq_in == seq) {
3731                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3732                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3733                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3734                 } else if (trunc) {
3735                         /* Can't do it, since they exceeded our buffer size  */
3736                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3737                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3738                         len = ntohs(req->ph.param_length);
3739                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3740                         for (i = 0; i < number_entries; i++) {
3741                                 temp = ntohs(req->list_of_streams[i]);
3742                                 req->list_of_streams[i] = temp;
3743                         }
3744                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3745                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3746                             asoc->str_reset_seq_out,
3747                             seq, (asoc->sending_seq - 1));
3748                         asoc->stream_reset_out_is_outstanding = 1;
3749                         asoc->str_reset = chk;
3750                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3751                         stcb->asoc.stream_reset_outstanding++;
3752                 } else {
3753                         /* Can't do it, since we have sent one out */
3754                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3755                 }
3756                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3757                 asoc->str_reset_seq_in++;
3758         } else if (asoc->str_reset_seq_in - 1 == seq) {
3759                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3760         } else if (asoc->str_reset_seq_in - 2 == seq) {
3761                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3762         } else {
3763                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3764         }
3765 }
3766
3767 static int
3768 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3769     struct sctp_tmit_chunk *chk,
3770     struct sctp_stream_reset_tsn_request *req)
3771 {
3772         /* reset all in and out and update the tsn */
3773         /*
3774          * A) reset my str-seq's on in and out. B) Select a receive next,
3775          * and set cum-ack to it. Also process this selected number as a
3776          * fwd-tsn as well. C) set in the response my next sending seq.
3777          */
3778         struct sctp_forward_tsn_chunk fwdtsn;
3779         struct sctp_association *asoc = &stcb->asoc;
3780         int abort_flag = 0;
3781         uint32_t seq;
3782
3783         seq = ntohl(req->request_seq);
3784         if (asoc->str_reset_seq_in == seq) {
3785                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3786                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3787                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3788                 } else {
3789                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3790                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3791                         fwdtsn.ch.chunk_flags = 0;
3792                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3793                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3794                         if (abort_flag) {
3795                                 return (1);
3796                         }
3797                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3798                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3799                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3800                         }
3801                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3802                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3803                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3804                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3805                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3806                         atomic_add_int(&asoc->sending_seq, 1);
3807                         /* save off historical data for retrans */
3808                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3809                         asoc->last_sending_seq[0] = asoc->sending_seq;
3810                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3811                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3812                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3813                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3814                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3815                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3816                 }
3817                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3818                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3819                 asoc->str_reset_seq_in++;
3820         } else if (asoc->str_reset_seq_in - 1 == seq) {
3821                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3822                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3823         } else if (asoc->str_reset_seq_in - 2 == seq) {
3824                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3825                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3826         } else {
3827                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3828         }
3829         return (0);
3830 }
3831
3832 static void
3833 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3834     struct sctp_tmit_chunk *chk,
3835     struct sctp_stream_reset_out_request *req, int trunc)
3836 {
3837         uint32_t seq, tsn;
3838         int number_entries, len;
3839         struct sctp_association *asoc = &stcb->asoc;
3840
3841         seq = ntohl(req->request_seq);
3842
3843         /* now if its not a duplicate we process it */
3844         if (asoc->str_reset_seq_in == seq) {
3845                 len = ntohs(req->ph.param_length);
3846                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3847                 /*
3848                  * the sender is resetting, handle the list issue.. we must
3849                  * a) verify if we can do the reset, if so no problem b) If
3850                  * we can't do the reset we must copy the request. c) queue
3851                  * it, and setup the data in processor to trigger it off
3852                  * when needed and dequeue all the queued data.
3853                  */
3854                 tsn = ntohl(req->send_reset_at_tsn);
3855
3856                 /* move the reset action back one */
3857                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3858                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3859                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3860                 } else if (trunc) {
3861                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3862                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3863                         /* we can do it now */
3864                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3865                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3866                 } else {
3867                         /*
3868                          * we must queue it up and thus wait for the TSN's
3869                          * to arrive that are at or before tsn
3870                          */
3871                         struct sctp_stream_reset_list *liste;
3872                         int siz;
3873
3874                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3875                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3876                             siz, SCTP_M_STRESET);
3877                         if (liste == NULL) {
3878                                 /* gak out of memory */
3879                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3880                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3881                                 return;
3882                         }
3883                         liste->tsn = tsn;
3884                         liste->number_entries = number_entries;
3885                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3886                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3887                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3888                 }
3889                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3890                 asoc->str_reset_seq_in++;
3891         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3892                 /*
3893                  * one seq back, just echo back last action since my
3894                  * response was lost.
3895                  */
3896                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3897         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3898                 /*
3899                  * two seq back, just echo back last action since my
3900                  * response was lost.
3901                  */
3902                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3903         } else {
3904                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3905         }
3906 }
3907
3908 static void
3909 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3910     struct sctp_stream_reset_add_strm *str_add)
3911 {
3912         /*
3913          * Peer is requesting to add more streams. If its within our
3914          * max-streams we will allow it.
3915          */
3916         uint32_t num_stream, i;
3917         uint32_t seq;
3918         struct sctp_association *asoc = &stcb->asoc;
3919         struct sctp_queued_to_read *ctl, *nctl;
3920
3921         /* Get the number. */
3922         seq = ntohl(str_add->request_seq);
3923         num_stream = ntohs(str_add->number_of_streams);
3924         /* Now what would be the new total? */
3925         if (asoc->str_reset_seq_in == seq) {
3926                 num_stream += stcb->asoc.streamincnt;
3927                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3928                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3929                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3930                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3931                     (num_stream > 0xffff)) {
3932                         /* We must reject it they ask for to many */
3933         denied:
3934                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3935                 } else {
3936                         /* Ok, we can do that :-) */
3937                         struct sctp_stream_in *oldstrm;
3938
3939                         /* save off the old */
3940                         oldstrm = stcb->asoc.strmin;
3941                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3942                             (num_stream * sizeof(struct sctp_stream_in)),
3943                             SCTP_M_STRMI);
3944                         if (stcb->asoc.strmin == NULL) {
3945                                 stcb->asoc.strmin = oldstrm;
3946                                 goto denied;
3947                         }
3948                         /* copy off the old data */
3949                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3950                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3951                                 stcb->asoc.strmin[i].stream_no = i;
3952                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3953                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3954                                 /* now anything on those queues? */
3955                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3956                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3957                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3958                                 }
3959                         }
3960                         /* Init the new streams */
3961                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3962                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3963                                 stcb->asoc.strmin[i].stream_no = i;
3964                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3965                                 stcb->asoc.strmin[i].delivery_started = 0;
3966                         }
3967                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3968                         /* update the size */
3969                         stcb->asoc.streamincnt = num_stream;
3970                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3971                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3972                 }
3973                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3974                 asoc->str_reset_seq_in++;
3975         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3976                 /*
3977                  * one seq back, just echo back last action since my
3978                  * response was lost.
3979                  */
3980                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3981         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3982                 /*
3983                  * two seq back, just echo back last action since my
3984                  * response was lost.
3985                  */
3986                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3987         } else {
3988                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3989
3990         }
3991 }
3992
3993 static void
3994 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3995     struct sctp_stream_reset_add_strm *str_add)
3996 {
3997         /*
3998          * Peer is requesting to add more streams. If its within our
3999          * max-streams we will allow it.
4000          */
4001         uint16_t num_stream;
4002         uint32_t seq;
4003         struct sctp_association *asoc = &stcb->asoc;
4004
4005         /* Get the number. */
4006         seq = ntohl(str_add->request_seq);
4007         num_stream = ntohs(str_add->number_of_streams);
4008         /* Now what would be the new total? */
4009         if (asoc->str_reset_seq_in == seq) {
4010                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4011                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4012                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4013                 } else if (stcb->asoc.stream_reset_outstanding) {
4014                         /* We must reject it we have something pending */
4015                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4016                 } else {
4017                         /* Ok, we can do that :-) */
4018                         int mychk;
4019
4020                         mychk = stcb->asoc.streamoutcnt;
4021                         mychk += num_stream;
4022                         if (mychk < 0x10000) {
4023                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4024                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4025                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4026                                 }
4027                         } else {
4028                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4029                         }
4030                 }
4031                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4032                 asoc->str_reset_seq_in++;
4033         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4034                 /*
4035                  * one seq back, just echo back last action since my
4036                  * response was lost.
4037                  */
4038                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4039         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4040                 /*
4041                  * two seq back, just echo back last action since my
4042                  * response was lost.
4043                  */
4044                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4045         } else {
4046                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4047         }
4048 }
4049
4050 #ifdef __GNUC__
4051 __attribute__((noinline))
4052 #endif
4053         static int
4054             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4055         struct sctp_chunkhdr *ch_req)
4056 {
4057         int chk_length, param_len, ptype;
4058         struct sctp_paramhdr pstore;
4059         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4060         uint32_t seq = 0;
4061         int num_req = 0;
4062         int trunc = 0;
4063         struct sctp_tmit_chunk *chk;
4064         struct sctp_chunkhdr *ch;
4065         struct sctp_paramhdr *ph;
4066         int ret_code = 0;
4067         int num_param = 0;
4068
4069         /* now it may be a reset or a reset-response */
4070         chk_length = ntohs(ch_req->chunk_length);
4071
4072         /* setup for adding the response */
4073         sctp_alloc_a_chunk(stcb, chk);
4074         if (chk == NULL) {
4075                 return (ret_code);
4076         }
4077         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4078         chk->rec.chunk_id.can_take_data = 0;
4079         chk->asoc = &stcb->asoc;
4080         chk->no_fr_allowed = 0;
4081         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4082         chk->book_size_scale = 0;
4083         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4084         if (chk->data == NULL) {
4085 strres_nochunk:
4086                 if (chk->data) {
4087                         sctp_m_freem(chk->data);
4088                         chk->data = NULL;
4089                 }
4090                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4091                 return (ret_code);
4092         }
4093         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4094
4095         /* setup chunk parameters */
4096         chk->sent = SCTP_DATAGRAM_UNSENT;
4097         chk->snd_count = 0;
4098         chk->whoTo = NULL;
4099
4100         ch = mtod(chk->data, struct sctp_chunkhdr *);
4101         ch->chunk_type = SCTP_STREAM_RESET;
4102         ch->chunk_flags = 0;
4103         ch->chunk_length = htons(chk->send_size);
4104         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4105         offset += sizeof(struct sctp_chunkhdr);
4106         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
4107                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4108                 if (ph == NULL)
4109                         break;
4110                 param_len = ntohs(ph->param_length);
4111                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
4112                         /* bad param */
4113                         break;
4114                 }
4115                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
4116                     (uint8_t *) & cstore);
4117                 ptype = ntohs(ph->param_type);
4118                 num_param++;
4119                 if (param_len > (int)sizeof(cstore)) {
4120                         trunc = 1;
4121                 } else {
4122                         trunc = 0;
4123                 }
4124                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4125                         /* hit the max of parameters already sorry.. */
4126                         break;
4127                 }
4128                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4129                         struct sctp_stream_reset_out_request *req_out;
4130
4131                         req_out = (struct sctp_stream_reset_out_request *)ph;
4132                         num_req++;
4133                         if (stcb->asoc.stream_reset_outstanding) {
4134                                 seq = ntohl(req_out->response_seq);
4135                                 if (seq == stcb->asoc.str_reset_seq_out) {
4136                                         /* implicit ack */
4137                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4138                                 }
4139                         }
4140                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4141                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4142                         struct sctp_stream_reset_add_strm *str_add;
4143
4144                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4145                         num_req++;
4146                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4147                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4148                         struct sctp_stream_reset_add_strm *str_add;
4149
4150                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4151                         num_req++;
4152                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4153                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4154                         struct sctp_stream_reset_in_request *req_in;
4155
4156                         num_req++;
4157                         req_in = (struct sctp_stream_reset_in_request *)ph;
4158                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4159                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4160                         struct sctp_stream_reset_tsn_request *req_tsn;
4161
4162                         num_req++;
4163                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4164                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4165                                 ret_code = 1;
4166                                 goto strres_nochunk;
4167                         }
4168                         /* no more */
4169                         break;
4170                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4171                         struct sctp_stream_reset_response *resp;
4172                         uint32_t result;
4173
4174                         resp = (struct sctp_stream_reset_response *)ph;
4175                         seq = ntohl(resp->response_seq);
4176                         result = ntohl(resp->result);
4177                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4178                                 ret_code = 1;
4179                                 goto strres_nochunk;
4180                         }
4181                 } else {
4182                         break;
4183                 }
4184                 offset += SCTP_SIZE32(param_len);
4185                 chk_length -= SCTP_SIZE32(param_len);
4186         }
4187         if (num_req == 0) {
4188                 /* we have no response free the stuff */
4189                 goto strres_nochunk;
4190         }
4191         /* ok we have a chunk to link in */
4192         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4193             chk,
4194             sctp_next);
4195         stcb->asoc.ctrl_queue_cnt++;
4196         return (ret_code);
4197 }
4198
4199 /*
4200  * Handle a router or endpoints report of a packet loss, there are two ways
4201  * to handle this, either we get the whole packet and must disect it
4202  * ourselves (possibly with truncation and or corruption) or it is a summary
4203  * from a middle box that did the disectting for us.
4204  */
4205 static void
4206 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4207     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4208 {
4209         uint32_t bottle_bw, on_queue;
4210         uint16_t trunc_len;
4211         unsigned int chlen;
4212         unsigned int at;
4213         struct sctp_chunk_desc desc;
4214         struct sctp_chunkhdr *ch;
4215
4216         chlen = ntohs(cp->ch.chunk_length);
4217         chlen -= sizeof(struct sctp_pktdrop_chunk);
4218         /* XXX possible chlen underflow */
4219         if (chlen == 0) {
4220                 ch = NULL;
4221                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4222                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4223         } else {
4224                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4225                 chlen -= sizeof(struct sctphdr);
4226                 /* XXX possible chlen underflow */
4227                 memset(&desc, 0, sizeof(desc));
4228         }
4229         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4230         if (trunc_len > limit) {
4231                 trunc_len = limit;
4232         }
4233         /* now the chunks themselves */
4234         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4235                 desc.chunk_type = ch->chunk_type;
4236                 /* get amount we need to move */
4237                 at = ntohs(ch->chunk_length);
4238                 if (at < sizeof(struct sctp_chunkhdr)) {
4239                         /* corrupt chunk, maybe at the end? */
4240                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4241                         break;
4242                 }
4243                 if (trunc_len == 0) {
4244                         /* we are supposed to have all of it */
4245                         if (at > chlen) {
4246                                 /* corrupt skip it */
4247                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4248                                 break;
4249                         }
4250                 } else {
4251                         /* is there enough of it left ? */
4252                         if (desc.chunk_type == SCTP_DATA) {
4253                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4254                                     sizeof(desc.data_bytes))) {
4255                                         break;
4256                                 }
4257                         } else {
4258                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4259                                         break;
4260                                 }
4261                         }
4262                 }
4263                 if (desc.chunk_type == SCTP_DATA) {
4264                         /* can we get out the tsn? */
4265                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4266                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4267
4268                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4269                                 /* yep */
4270                                 struct sctp_data_chunk *dcp;
4271                                 uint8_t *ddp;
4272                                 unsigned int iii;
4273
4274                                 dcp = (struct sctp_data_chunk *)ch;
4275                                 ddp = (uint8_t *) (dcp + 1);
4276                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4277                                         desc.data_bytes[iii] = ddp[iii];
4278                                 }
4279                                 desc.tsn_ifany = dcp->dp.tsn;
4280                         } else {
4281                                 /* nope we are done. */
4282                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4283                                 break;
4284                         }
4285                 } else {
4286                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4287                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4288                 }
4289
4290                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4291                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4292                         break;
4293                 }
4294                 if (SCTP_SIZE32(at) > chlen) {
4295                         break;
4296                 }
4297                 chlen -= SCTP_SIZE32(at);
4298                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4299                         /* done, none left */
4300                         break;
4301                 }
4302                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4303         }
4304         /* Now update any rwnd --- possibly */
4305         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4306                 /* From a peer, we get a rwnd report */
4307                 uint32_t a_rwnd;
4308
4309                 SCTP_STAT_INCR(sctps_pdrpfehos);
4310
4311                 bottle_bw = ntohl(cp->bottle_bw);
4312                 on_queue = ntohl(cp->current_onq);
4313                 if (bottle_bw && on_queue) {
4314                         /* a rwnd report is in here */
4315                         if (bottle_bw > on_queue)
4316                                 a_rwnd = bottle_bw - on_queue;
4317                         else
4318                                 a_rwnd = 0;
4319
4320                         if (a_rwnd == 0)
4321                                 stcb->asoc.peers_rwnd = 0;
4322                         else {
4323                                 if (a_rwnd > stcb->asoc.total_flight) {
4324                                         stcb->asoc.peers_rwnd =
4325                                             a_rwnd - stcb->asoc.total_flight;
4326                                 } else {
4327                                         stcb->asoc.peers_rwnd = 0;
4328                                 }
4329                                 if (stcb->asoc.peers_rwnd <
4330                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4331                                         /* SWS sender side engages */
4332                                         stcb->asoc.peers_rwnd = 0;
4333                                 }
4334                         }
4335                 }
4336         } else {
4337                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4338         }
4339
4340         /* now middle boxes in sat networks get a cwnd bump */
4341         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4342             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4343             (stcb->asoc.sat_network)) {
4344                 /*
4345                  * This is debateable but for sat networks it makes sense
4346                  * Note if a T3 timer has went off, we will prohibit any
4347                  * changes to cwnd until we exit the t3 loss recovery.
4348                  */
4349                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4350                     net, cp, &bottle_bw, &on_queue);
4351         }
4352 }
4353
4354 /*
4355  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4356  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4357  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4358  * length of the complete packet outputs: - length: modified to remaining
4359  * length after control processing - netp: modified to new sctp_nets after
4360  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4361  * bad packet,...) otherwise return the tcb for this packet
4362  */
4363 #ifdef __GNUC__
4364 __attribute__((noinline))
4365 #endif
4366         static struct sctp_tcb *
4367                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4368              struct sockaddr *src, struct sockaddr *dst,
4369              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4370              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4371              uint8_t use_mflowid, uint32_t mflowid,
4372              uint32_t vrf_id, uint16_t port)
4373 {
4374         struct sctp_association *asoc;
4375         struct mbuf *op_err;
4376         char msg[SCTP_DIAG_INFO_LEN];
4377         uint32_t vtag_in;
4378         int num_chunks = 0;     /* number of control chunks processed */
4379         uint32_t chk_length;
4380         int ret;
4381         int abort_no_unlock = 0;
4382         int ecne_seen = 0;
4383
4384         /*
4385          * How big should this be, and should it be alloc'd? Lets try the
4386          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4387          * until we get into jumbo grams and such..
4388          */
4389         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4390         struct sctp_tcb *locked_tcb = stcb;
4391         int got_auth = 0;
4392         uint32_t auth_offset = 0, auth_len = 0;
4393         int auth_skipped = 0;
4394         int asconf_cnt = 0;
4395
4396 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4397         struct socket *so;
4398
4399 #endif
4400
4401         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4402             iphlen, *offset, length, (void *)stcb);
4403
4404         /* validate chunk header length... */
4405         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4406                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4407                     ntohs(ch->chunk_length));
4408                 if (locked_tcb) {
4409                         SCTP_TCB_UNLOCK(locked_tcb);
4410                 }
4411                 return (NULL);
4412         }
4413         /*
4414          * validate the verification tag
4415          */
4416         vtag_in = ntohl(sh->v_tag);
4417
4418         if (locked_tcb) {
4419                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4420         }
4421         if (ch->chunk_type == SCTP_INITIATION) {
4422                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4423                     ntohs(ch->chunk_length), vtag_in);
4424                 if (vtag_in != 0) {
4425                         /* protocol error- silently discard... */
4426                         SCTP_STAT_INCR(sctps_badvtag);
4427                         if (locked_tcb) {
4428                                 SCTP_TCB_UNLOCK(locked_tcb);
4429                         }
4430                         return (NULL);
4431                 }
4432         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4433                 /*
4434                  * If there is no stcb, skip the AUTH chunk and process
4435                  * later after a stcb is found (to validate the lookup was
4436                  * valid.
4437                  */
4438                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4439                     (stcb == NULL) &&
4440                     !SCTP_BASE_SYSCTL(sctp_auth_disable)) {
4441                         /* save this chunk for later processing */
4442                         auth_skipped = 1;
4443                         auth_offset = *offset;
4444                         auth_len = ntohs(ch->chunk_length);
4445
4446                         /* (temporarily) move past this chunk */
4447                         *offset += SCTP_SIZE32(auth_len);
4448                         if (*offset >= length) {
4449                                 /* no more data left in the mbuf chain */
4450                                 *offset = length;
4451                                 if (locked_tcb) {
4452                                         SCTP_TCB_UNLOCK(locked_tcb);
4453                                 }
4454                                 return (NULL);
4455                         }
4456                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4457                             sizeof(struct sctp_chunkhdr), chunk_buf);
4458                 }
4459                 if (ch == NULL) {
4460                         /* Help */
4461                         *offset = length;
4462                         if (locked_tcb) {
4463                                 SCTP_TCB_UNLOCK(locked_tcb);
4464                         }
4465                         return (NULL);
4466                 }
4467                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4468                         goto process_control_chunks;
4469                 }
4470                 /*
4471                  * first check if it's an ASCONF with an unknown src addr we
4472                  * need to look inside to find the association
4473                  */
4474                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4475                         struct sctp_chunkhdr *asconf_ch = ch;
4476                         uint32_t asconf_offset = 0, asconf_len = 0;
4477
4478                         /* inp's refcount may be reduced */
4479                         SCTP_INP_INCR_REF(inp);
4480
4481                         asconf_offset = *offset;
4482                         do {
4483                                 asconf_len = ntohs(asconf_ch->chunk_length);
4484                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4485                                         break;
4486                                 stcb = sctp_findassociation_ep_asconf(m,
4487                                     *offset,
4488                                     dst,
4489                                     sh, &inp, netp, vrf_id);
4490                                 if (stcb != NULL)
4491                                         break;
4492                                 asconf_offset += SCTP_SIZE32(asconf_len);
4493                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4494                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4495                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4496                         if (stcb == NULL) {
4497                                 /*
4498                                  * reduce inp's refcount if not reduced in
4499                                  * sctp_findassociation_ep_asconf().
4500                                  */
4501                                 SCTP_INP_DECR_REF(inp);
4502                         } else {
4503                                 locked_tcb = stcb;
4504                         }
4505
4506                         /* now go back and verify any auth chunk to be sure */
4507                         if (auth_skipped && (stcb != NULL)) {
4508                                 struct sctp_auth_chunk *auth;
4509
4510                                 auth = (struct sctp_auth_chunk *)
4511                                     sctp_m_getptr(m, auth_offset,
4512                                     auth_len, chunk_buf);
4513                                 got_auth = 1;
4514                                 auth_skipped = 0;
4515                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4516                                     auth_offset)) {
4517                                         /* auth HMAC failed so dump it */
4518                                         *offset = length;
4519                                         if (locked_tcb) {
4520                                                 SCTP_TCB_UNLOCK(locked_tcb);
4521                                         }
4522                                         return (NULL);
4523                                 } else {
4524                                         /* remaining chunks are HMAC checked */
4525                                         stcb->asoc.authenticated = 1;
4526                                 }
4527                         }
4528                 }
4529                 if (stcb == NULL) {
4530                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4531                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4532                             msg);
4533                         /* no association, so it's out of the blue... */
4534                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4535                             use_mflowid, mflowid,
4536                             vrf_id, port);
4537                         *offset = length;
4538                         if (locked_tcb) {
4539                                 SCTP_TCB_UNLOCK(locked_tcb);
4540                         }
4541                         return (NULL);
4542                 }
4543                 asoc = &stcb->asoc;
4544                 /* ABORT and SHUTDOWN can use either v_tag... */
4545                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4546                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4547                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4548                         /* Take the T-bit always into account. */
4549                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4550                             (vtag_in == asoc->my_vtag)) ||
4551                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4552                             (vtag_in == asoc->peer_vtag))) {
4553                                 /* this is valid */
4554                         } else {
4555                                 /* drop this packet... */
4556                                 SCTP_STAT_INCR(sctps_badvtag);
4557                                 if (locked_tcb) {
4558                                         SCTP_TCB_UNLOCK(locked_tcb);
4559                                 }
4560                                 return (NULL);
4561                         }
4562                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4563                         if (vtag_in != asoc->my_vtag) {
4564                                 /*
4565                                  * this could be a stale SHUTDOWN-ACK or the
4566                                  * peer never got the SHUTDOWN-COMPLETE and
4567                                  * is still hung; we have started a new asoc
4568                                  * but it won't complete until the shutdown
4569                                  * is completed
4570                                  */
4571                                 if (locked_tcb) {
4572                                         SCTP_TCB_UNLOCK(locked_tcb);
4573                                 }
4574                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4575                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4576                                     msg);
4577                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4578                                     sh, inp, op_err,
4579                                     use_mflowid, mflowid,
4580                                     vrf_id, port);
4581                                 return (NULL);
4582                         }
4583                 } else {
4584                         /* for all other chunks, vtag must match */
4585                         if (vtag_in != asoc->my_vtag) {
4586                                 /* invalid vtag... */
4587                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4588                                     "invalid vtag: %xh, expect %xh\n",
4589                                     vtag_in, asoc->my_vtag);
4590                                 SCTP_STAT_INCR(sctps_badvtag);
4591                                 if (locked_tcb) {
4592                                         SCTP_TCB_UNLOCK(locked_tcb);
4593                                 }
4594                                 *offset = length;
4595                                 return (NULL);
4596                         }
4597                 }
4598         }                       /* end if !SCTP_COOKIE_ECHO */
4599         /*
4600          * process all control chunks...
4601          */
4602         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4603             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4604             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4605             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4606                 /* implied cookie-ack.. we must have lost the ack */
4607                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4608                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4609                             stcb->asoc.overall_error_count,
4610                             0,
4611                             SCTP_FROM_SCTP_INPUT,
4612                             __LINE__);
4613                 }
4614                 stcb->asoc.overall_error_count = 0;
4615                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4616                     *netp);
4617         }
4618 process_control_chunks:
4619         while (IS_SCTP_CONTROL(ch)) {
4620                 /* validate chunk length */
4621                 chk_length = ntohs(ch->chunk_length);
4622                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4623                     ch->chunk_type, chk_length);
4624                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4625                 if (chk_length < sizeof(*ch) ||
4626                     (*offset + (int)chk_length) > length) {
4627                         *offset = length;
4628                         if (locked_tcb) {
4629                                 SCTP_TCB_UNLOCK(locked_tcb);
4630                         }
4631                         return (NULL);
4632                 }
4633                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4634                 /*
4635                  * INIT-ACK only gets the init ack "header" portion only
4636                  * because we don't have to process the peer's COOKIE. All
4637                  * others get a complete chunk.
4638                  */
4639                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4640                     (ch->chunk_type == SCTP_INITIATION)) {
4641                         /* get an init-ack chunk */
4642                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4643                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4644                         if (ch == NULL) {
4645                                 *offset = length;
4646                                 if (locked_tcb) {
4647                                         SCTP_TCB_UNLOCK(locked_tcb);
4648                                 }
4649                                 return (NULL);
4650                         }
4651                 } else {
4652                         /* For cookies and all other chunks. */
4653                         if (chk_length > sizeof(chunk_buf)) {
4654                                 /*
4655                                  * use just the size of the chunk buffer so
4656                                  * the front part of our chunks fit in
4657                                  * contiguous space up to the chunk buffer
4658                                  * size (508 bytes). For chunks that need to
4659                                  * get more than that they must use the
4660                                  * sctp_m_getptr() function or other means
4661                                  * (e.g. know how to parse mbuf chains).
4662                                  * Cookies do this already.
4663                                  */
4664                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4665                                     (sizeof(chunk_buf) - 4),
4666                                     chunk_buf);
4667                                 if (ch == NULL) {
4668                                         *offset = length;
4669                                         if (locked_tcb) {
4670                                                 SCTP_TCB_UNLOCK(locked_tcb);
4671                                         }
4672                                         return (NULL);
4673                                 }
4674                         } else {
4675                                 /* We can fit it all */
4676                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4677                                     chk_length, chunk_buf);
4678                                 if (ch == NULL) {
4679                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4680                                         *offset = length;
4681                                         if (locked_tcb) {
4682                                                 SCTP_TCB_UNLOCK(locked_tcb);
4683                                         }
4684                                         return (NULL);
4685                                 }
4686                         }
4687                 }
4688                 num_chunks++;
4689                 /* Save off the last place we got a control from */
4690                 if (stcb != NULL) {
4691                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4692                                 /*
4693                                  * allow last_control to be NULL if
4694                                  * ASCONF... ASCONF processing will find the
4695                                  * right net later
4696                                  */
4697                                 if ((netp != NULL) && (*netp != NULL))
4698                                         stcb->asoc.last_control_chunk_from = *netp;
4699                         }
4700                 }
4701 #ifdef SCTP_AUDITING_ENABLED
4702                 sctp_audit_log(0xB0, ch->chunk_type);
4703 #endif
4704
4705                 /* check to see if this chunk required auth, but isn't */
4706                 if ((stcb != NULL) &&
4707                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
4708                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4709                     !stcb->asoc.authenticated) {
4710                         /* "silently" ignore */
4711                         SCTP_STAT_INCR(sctps_recvauthmissing);
4712                         goto next_chunk;
4713                 }
4714                 switch (ch->chunk_type) {
4715                 case SCTP_INITIATION:
4716                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4717                         /* The INIT chunk must be the only chunk. */
4718                         if ((num_chunks > 1) ||
4719                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4720                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4721                                     "INIT not the only chunk");
4722                                 sctp_abort_association(inp, stcb, m, iphlen,
4723                                     src, dst, sh, op_err,
4724                                     use_mflowid, mflowid,
4725                                     vrf_id, port);
4726                                 *offset = length;
4727                                 return (NULL);
4728                         }
4729                         /* Honor our resource limit. */
4730                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4731                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4732                                 sctp_abort_association(inp, stcb, m, iphlen,
4733                                     src, dst, sh, op_err,
4734                                     use_mflowid, mflowid,
4735                                     vrf_id, port);
4736                                 *offset = length;
4737                                 return (NULL);
4738                         }
4739                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4740                             (struct sctp_init_chunk *)ch, inp,
4741                             stcb, &abort_no_unlock,
4742                             use_mflowid, mflowid,
4743                             vrf_id, port);
4744                         *offset = length;
4745                         if ((!abort_no_unlock) && (locked_tcb)) {
4746                                 SCTP_TCB_UNLOCK(locked_tcb);
4747                         }
4748                         return (NULL);
4749                         break;
4750                 case SCTP_PAD_CHUNK:
4751                         break;
4752                 case SCTP_INITIATION_ACK:
4753                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4754                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4755                                 /* We are not interested anymore */
4756                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4757                                         ;
4758                                 } else {
4759                                         if (locked_tcb != stcb) {
4760                                                 /* Very unlikely */
4761                                                 SCTP_TCB_UNLOCK(locked_tcb);
4762                                         }
4763                                         *offset = length;
4764                                         if (stcb) {
4765 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4766                                                 so = SCTP_INP_SO(inp);
4767                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4768                                                 SCTP_TCB_UNLOCK(stcb);
4769                                                 SCTP_SOCKET_LOCK(so, 1);
4770                                                 SCTP_TCB_LOCK(stcb);
4771                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4772 #endif
4773                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4774 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4775                                                 SCTP_SOCKET_UNLOCK(so, 1);
4776 #endif
4777                                         }
4778                                         return (NULL);
4779                                 }
4780                         }
4781                         /* The INIT-ACK chunk must be the only chunk. */
4782                         if ((num_chunks > 1) ||
4783                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4784                                 *offset = length;
4785                                 if (locked_tcb) {
4786                                         SCTP_TCB_UNLOCK(locked_tcb);
4787                                 }
4788                                 return (NULL);
4789                         }
4790                         if ((netp) && (*netp)) {
4791                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4792                                     src, dst, sh,
4793                                     (struct sctp_init_ack_chunk *)ch,
4794                                     stcb, *netp,
4795                                     &abort_no_unlock,
4796                                     use_mflowid, mflowid,
4797                                     vrf_id);
4798                         } else {
4799                                 ret = -1;
4800                         }
4801                         *offset = length;
4802                         if (abort_no_unlock) {
4803                                 return (NULL);
4804                         }
4805                         /*
4806                          * Special case, I must call the output routine to
4807                          * get the cookie echoed
4808                          */
4809                         if ((stcb != NULL) && (ret == 0)) {
4810                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4811                         }
4812                         if (locked_tcb) {
4813                                 SCTP_TCB_UNLOCK(locked_tcb);
4814                         }
4815                         return (NULL);
4816                         break;
4817                 case SCTP_SELECTIVE_ACK:
4818                         {
4819                                 struct sctp_sack_chunk *sack;
4820                                 int abort_now = 0;
4821                                 uint32_t a_rwnd, cum_ack;
4822                                 uint16_t num_seg, num_dup;
4823                                 uint8_t flags;
4824                                 int offset_seg, offset_dup;
4825
4826                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4827                                 SCTP_STAT_INCR(sctps_recvsacks);
4828                                 if (stcb == NULL) {
4829                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4830                                         break;
4831                                 }
4832                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4833                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4834                                         break;
4835                                 }
4836                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4837                                         /*-
4838                                          * If we have sent a shutdown-ack, we will pay no
4839                                          * attention to a sack sent in to us since
4840                                          * we don't care anymore.
4841                                          */
4842                                         break;
4843                                 }
4844                                 sack = (struct sctp_sack_chunk *)ch;
4845                                 flags = ch->chunk_flags;
4846                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4847                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4848                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4849                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4850                                 if (sizeof(struct sctp_sack_chunk) +
4851                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4852                                     num_dup * sizeof(uint32_t) != chk_length) {
4853                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4854                                         break;
4855                                 }
4856                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4857                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4858                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4859                                     cum_ack, num_seg, a_rwnd);
4860                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4861                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4862                                     (num_seg == 0) &&
4863                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4864                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4865                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4866                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4867                                     ) {
4868                                         /*
4869                                          * We have a SIMPLE sack having no
4870                                          * prior segments and data on sent
4871                                          * queue to be acked.. Use the
4872                                          * faster path sack processing. We
4873                                          * also allow window update sacks
4874                                          * with no missing segments to go
4875                                          * this way too.
4876                                          */
4877                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4878                                 } else {
4879                                         if (netp && *netp)
4880                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4881                                                     num_seg, 0, num_dup, &abort_now, flags,
4882                                                     cum_ack, a_rwnd, ecne_seen);
4883                                 }
4884                                 if (abort_now) {
4885                                         /* ABORT signal from sack processing */
4886                                         *offset = length;
4887                                         return (NULL);
4888                                 }
4889                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4890                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4891                                     (stcb->asoc.stream_queue_cnt == 0)) {
4892                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4893                                 }
4894                         }
4895                         break;
4896                         /*
4897                          * EY - nr_sack:  If the received chunk is an
4898                          * nr_sack chunk
4899                          */
4900                 case SCTP_NR_SELECTIVE_ACK:
4901                         {
4902                                 struct sctp_nr_sack_chunk *nr_sack;
4903                                 int abort_now = 0;
4904                                 uint32_t a_rwnd, cum_ack;
4905                                 uint16_t num_seg, num_nr_seg, num_dup;
4906                                 uint8_t flags;
4907                                 int offset_seg, offset_dup;
4908
4909                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4910                                 SCTP_STAT_INCR(sctps_recvsacks);
4911                                 if (stcb == NULL) {
4912                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4913                                         break;
4914                                 }
4915                                 if (stcb->asoc.nrsack_supported == 0) {
4916                                         goto unknown_chunk;
4917                                 }
4918                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4919                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4920                                         break;
4921                                 }
4922                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4923                                         /*-
4924                                          * If we have sent a shutdown-ack, we will pay no
4925                                          * attention to a sack sent in to us since
4926                                          * we don't care anymore.
4927                                          */
4928                                         break;
4929                                 }
4930                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4931                                 flags = ch->chunk_flags;
4932                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4933                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4934                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4935                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4936                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4937                                 if (sizeof(struct sctp_nr_sack_chunk) +
4938                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4939                                     num_dup * sizeof(uint32_t) != chk_length) {
4940                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4941                                         break;
4942                                 }
4943                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4944                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4945                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4946                                     cum_ack, num_seg, a_rwnd);
4947                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4948                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4949                                     (num_seg == 0) && (num_nr_seg == 0) &&
4950                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4951                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4952                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4953                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4954                                         /*
4955                                          * We have a SIMPLE sack having no
4956                                          * prior segments and data on sent
4957                                          * queue to be acked. Use the faster
4958                                          * path sack processing. We also
4959                                          * allow window update sacks with no
4960                                          * missing segments to go this way
4961                                          * too.
4962                                          */
4963                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4964                                             &abort_now, ecne_seen);
4965                                 } else {
4966                                         if (netp && *netp)
4967                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4968                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4969                                                     cum_ack, a_rwnd, ecne_seen);
4970                                 }
4971                                 if (abort_now) {
4972                                         /* ABORT signal from sack processing */
4973                                         *offset = length;
4974                                         return (NULL);
4975                                 }
4976                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4977                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4978                                     (stcb->asoc.stream_queue_cnt == 0)) {
4979                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4980                                 }
4981                         }
4982                         break;
4983
4984                 case SCTP_HEARTBEAT_REQUEST:
4985                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4986                         if ((stcb) && netp && *netp) {
4987                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4988                                 sctp_send_heartbeat_ack(stcb, m, *offset,
4989                                     chk_length, *netp);
4990
4991                                 /* He's alive so give him credit */
4992                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4993                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4994                                             stcb->asoc.overall_error_count,
4995                                             0,
4996                                             SCTP_FROM_SCTP_INPUT,
4997                                             __LINE__);
4998                                 }
4999                                 stcb->asoc.overall_error_count = 0;
5000                         }
5001                         break;
5002                 case SCTP_HEARTBEAT_ACK:
5003                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5004                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5005                                 /* Its not ours */
5006                                 *offset = length;
5007                                 if (locked_tcb) {
5008                                         SCTP_TCB_UNLOCK(locked_tcb);
5009                                 }
5010                                 return (NULL);
5011                         }
5012                         /* He's alive so give him credit */
5013                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5014                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5015                                     stcb->asoc.overall_error_count,
5016                                     0,
5017                                     SCTP_FROM_SCTP_INPUT,
5018                                     __LINE__);
5019                         }
5020                         stcb->asoc.overall_error_count = 0;
5021                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5022                         if (netp && *netp)
5023                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5024                                     stcb, *netp);
5025                         break;
5026                 case SCTP_ABORT_ASSOCIATION:
5027                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5028                             (void *)stcb);
5029                         if ((stcb) && netp && *netp)
5030                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5031                                     stcb, *netp);
5032                         *offset = length;
5033                         return (NULL);
5034                         break;
5035                 case SCTP_SHUTDOWN:
5036                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5037                             (void *)stcb);
5038                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5039                                 *offset = length;
5040                                 if (locked_tcb) {
5041                                         SCTP_TCB_UNLOCK(locked_tcb);
5042                                 }
5043                                 return (NULL);
5044                         }
5045                         if (netp && *netp) {
5046                                 int abort_flag = 0;
5047
5048                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5049                                     stcb, *netp, &abort_flag);
5050                                 if (abort_flag) {
5051                                         *offset = length;
5052                                         return (NULL);
5053                                 }
5054                         }
5055                         break;
5056                 case SCTP_SHUTDOWN_ACK:
5057                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5058                         if ((stcb) && (netp) && (*netp))
5059                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5060                         *offset = length;
5061                         return (NULL);
5062                         break;
5063
5064                 case SCTP_OPERATION_ERROR:
5065                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5066                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5067                                 *offset = length;
5068                                 return (NULL);
5069                         }
5070                         break;
5071                 case SCTP_COOKIE_ECHO:
5072                         SCTPDBG(SCTP_DEBUG_INPUT3,
5073                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5074                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5075                                 ;
5076                         } else {
5077                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5078                                         /* We are not interested anymore */
5079                         abend:
5080                                         if (stcb) {
5081                                                 SCTP_TCB_UNLOCK(stcb);
5082                                         }
5083                                         *offset = length;
5084                                         return (NULL);
5085                                 }
5086                         }
5087                         /*
5088                          * First are we accepting? We do this again here
5089                          * since it is possible that a previous endpoint WAS
5090                          * listening responded to a INIT-ACK and then
5091                          * closed. We opened and bound.. and are now no
5092                          * longer listening.
5093                          */
5094
5095                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5096                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5097                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5098                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5099                                         sctp_abort_association(inp, stcb, m, iphlen,
5100                                             src, dst, sh, op_err,
5101                                             use_mflowid, mflowid,
5102                                             vrf_id, port);
5103                                 }
5104                                 *offset = length;
5105                                 return (NULL);
5106                         } else {
5107                                 struct mbuf *ret_buf;
5108                                 struct sctp_inpcb *linp;
5109
5110                                 if (stcb) {
5111                                         linp = NULL;
5112                                 } else {
5113                                         linp = inp;
5114                                 }
5115
5116                                 if (linp) {
5117                                         SCTP_ASOC_CREATE_LOCK(linp);
5118                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5119                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5120                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5121                                                 goto abend;
5122                                         }
5123                                 }
5124                                 if (netp) {
5125                                         ret_buf =
5126                                             sctp_handle_cookie_echo(m, iphlen,
5127                                             *offset,
5128                                             src, dst,
5129                                             sh,
5130                                             (struct sctp_cookie_echo_chunk *)ch,
5131                                             &inp, &stcb, netp,
5132                                             auth_skipped,
5133                                             auth_offset,
5134                                             auth_len,
5135                                             &locked_tcb,
5136                                             use_mflowid,
5137                                             mflowid,
5138                                             vrf_id,
5139                                             port);
5140                                 } else {
5141                                         ret_buf = NULL;
5142                                 }
5143                                 if (linp) {
5144                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5145                                 }
5146                                 if (ret_buf == NULL) {
5147                                         if (locked_tcb) {
5148                                                 SCTP_TCB_UNLOCK(locked_tcb);
5149                                         }
5150                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5151                                             "GAK, null buffer\n");
5152                                         *offset = length;
5153                                         return (NULL);
5154                                 }
5155                                 /* if AUTH skipped, see if it verified... */
5156                                 if (auth_skipped) {
5157                                         got_auth = 1;
5158                                         auth_skipped = 0;
5159                                 }
5160                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5161                                         /*
5162                                          * Restart the timer if we have
5163                                          * pending data
5164                                          */
5165                                         struct sctp_tmit_chunk *chk;
5166
5167                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5168                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5169                                 }
5170                         }
5171                         break;
5172                 case SCTP_COOKIE_ACK:
5173                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5174                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5175                                 if (locked_tcb) {
5176                                         SCTP_TCB_UNLOCK(locked_tcb);
5177                                 }
5178                                 return (NULL);
5179                         }
5180                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5181                                 /* We are not interested anymore */
5182                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5183                                         ;
5184                                 } else if (stcb) {
5185 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5186                                         so = SCTP_INP_SO(inp);
5187                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5188                                         SCTP_TCB_UNLOCK(stcb);
5189                                         SCTP_SOCKET_LOCK(so, 1);
5190                                         SCTP_TCB_LOCK(stcb);
5191                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5192 #endif
5193                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5194 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5195                                         SCTP_SOCKET_UNLOCK(so, 1);
5196 #endif
5197                                         *offset = length;
5198                                         return (NULL);
5199                                 }
5200                         }
5201                         /* He's alive so give him credit */
5202                         if ((stcb) && netp && *netp) {
5203                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5204                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5205                                             stcb->asoc.overall_error_count,
5206                                             0,
5207                                             SCTP_FROM_SCTP_INPUT,
5208                                             __LINE__);
5209                                 }
5210                                 stcb->asoc.overall_error_count = 0;
5211                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5212                         }
5213                         break;
5214                 case SCTP_ECN_ECHO:
5215                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5216                         /* He's alive so give him credit */
5217                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5218                                 /* Its not ours */
5219                                 if (locked_tcb) {
5220                                         SCTP_TCB_UNLOCK(locked_tcb);
5221                                 }
5222                                 *offset = length;
5223                                 return (NULL);
5224                         }
5225                         if (stcb) {
5226                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5227                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5228                                             stcb->asoc.overall_error_count,
5229                                             0,
5230                                             SCTP_FROM_SCTP_INPUT,
5231                                             __LINE__);
5232                                 }
5233                                 stcb->asoc.overall_error_count = 0;
5234                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5235                                     stcb);
5236                                 ecne_seen = 1;
5237                         }
5238                         break;
5239                 case SCTP_ECN_CWR:
5240                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5241                         /* He's alive so give him credit */
5242                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5243                                 /* Its not ours */
5244                                 if (locked_tcb) {
5245                                         SCTP_TCB_UNLOCK(locked_tcb);
5246                                 }
5247                                 *offset = length;
5248                                 return (NULL);
5249                         }
5250                         if (stcb) {
5251                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5252                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5253                                             stcb->asoc.overall_error_count,
5254                                             0,
5255                                             SCTP_FROM_SCTP_INPUT,
5256                                             __LINE__);
5257                                 }
5258                                 stcb->asoc.overall_error_count = 0;
5259                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5260                         }
5261                         break;
5262                 case SCTP_SHUTDOWN_COMPLETE:
5263                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5264                         /* must be first and only chunk */
5265                         if ((num_chunks > 1) ||
5266                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5267                                 *offset = length;
5268                                 if (locked_tcb) {
5269                                         SCTP_TCB_UNLOCK(locked_tcb);
5270                                 }
5271                                 return (NULL);
5272                         }
5273                         if ((stcb) && netp && *netp) {
5274                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5275                                     stcb, *netp);
5276                         }
5277                         *offset = length;
5278                         return (NULL);
5279                         break;
5280                 case SCTP_ASCONF:
5281                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5282                         /* He's alive so give him credit */
5283                         if (stcb) {
5284                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5285                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5286                                             stcb->asoc.overall_error_count,
5287                                             0,
5288                                             SCTP_FROM_SCTP_INPUT,
5289                                             __LINE__);
5290                                 }
5291                                 stcb->asoc.overall_error_count = 0;
5292                                 sctp_handle_asconf(m, *offset, src,
5293                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5294                                 asconf_cnt++;
5295                         }
5296                         break;
5297                 case SCTP_ASCONF_ACK:
5298                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5299                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5300                                 /* Its not ours */
5301                                 if (locked_tcb) {
5302                                         SCTP_TCB_UNLOCK(locked_tcb);
5303                                 }
5304                                 *offset = length;
5305                                 return (NULL);
5306                         }
5307                         if ((stcb) && netp && *netp) {
5308                                 /* He's alive so give him credit */
5309                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5310                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5311                                             stcb->asoc.overall_error_count,
5312                                             0,
5313                                             SCTP_FROM_SCTP_INPUT,
5314                                             __LINE__);
5315                                 }
5316                                 stcb->asoc.overall_error_count = 0;
5317                                 sctp_handle_asconf_ack(m, *offset,
5318                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5319                                 if (abort_no_unlock)
5320                                         return (NULL);
5321                         }
5322                         break;
5323                 case SCTP_FORWARD_CUM_TSN:
5324                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5325                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5326                                 /* Its not ours */
5327                                 if (locked_tcb) {
5328                                         SCTP_TCB_UNLOCK(locked_tcb);
5329                                 }
5330                                 *offset = length;
5331                                 return (NULL);
5332                         }
5333                         /* He's alive so give him credit */
5334                         if (stcb) {
5335                                 int abort_flag = 0;
5336
5337                                 stcb->asoc.overall_error_count = 0;
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                                 *fwd_tsn_seen = 1;
5346                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5347                                         /* We are not interested anymore */
5348 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5349                                         so = SCTP_INP_SO(inp);
5350                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5351                                         SCTP_TCB_UNLOCK(stcb);
5352                                         SCTP_SOCKET_LOCK(so, 1);
5353                                         SCTP_TCB_LOCK(stcb);
5354                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5355 #endif
5356                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5357 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5358                                         SCTP_SOCKET_UNLOCK(so, 1);
5359 #endif
5360                                         *offset = length;
5361                                         return (NULL);
5362                                 }
5363                                 sctp_handle_forward_tsn(stcb,
5364                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5365                                 if (abort_flag) {
5366                                         *offset = length;
5367                                         return (NULL);
5368                                 } else {
5369                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5370                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5371                                                     stcb->asoc.overall_error_count,
5372                                                     0,
5373                                                     SCTP_FROM_SCTP_INPUT,
5374                                                     __LINE__);
5375                                         }
5376                                         stcb->asoc.overall_error_count = 0;
5377                                 }
5378
5379                         }
5380                         break;
5381                 case SCTP_STREAM_RESET:
5382                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5383                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5384                                 /* Its not ours */
5385                                 if (locked_tcb) {
5386                                         SCTP_TCB_UNLOCK(locked_tcb);
5387                                 }
5388                                 *offset = length;
5389                                 return (NULL);
5390                         }
5391                         if (stcb->asoc.peer_supports_strreset == 0) {
5392                                 /*
5393                                  * hmm, peer should have announced this, but
5394                                  * we will turn it on since he is sending us
5395                                  * a stream reset.
5396                                  */
5397                                 stcb->asoc.peer_supports_strreset = 1;
5398                         }
5399                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5400                                 /* stop processing */
5401                                 *offset = length;
5402                                 return (NULL);
5403                         }
5404                         break;
5405                 case SCTP_PACKET_DROPPED:
5406                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5407                         /* re-get it all please */
5408                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5409                                 /* Its not ours */
5410                                 if (locked_tcb) {
5411                                         SCTP_TCB_UNLOCK(locked_tcb);
5412                                 }
5413                                 *offset = length;
5414                                 return (NULL);
5415                         }
5416                         if (ch && (stcb) && netp && (*netp)) {
5417                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5418                                     stcb, *netp,
5419                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5420
5421                         }
5422                         break;
5423
5424                 case SCTP_AUTHENTICATION:
5425                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5426                         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
5427                                 goto unknown_chunk;
5428
5429                         if (stcb == NULL) {
5430                                 /* save the first AUTH for later processing */
5431                                 if (auth_skipped == 0) {
5432                                         auth_offset = *offset;
5433                                         auth_len = chk_length;
5434                                         auth_skipped = 1;
5435                                 }
5436                                 /* skip this chunk (temporarily) */
5437                                 goto next_chunk;
5438                         }
5439                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5440                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5441                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5442                                 /* Its not ours */
5443                                 if (locked_tcb) {
5444                                         SCTP_TCB_UNLOCK(locked_tcb);
5445                                 }
5446                                 *offset = length;
5447                                 return (NULL);
5448                         }
5449                         if (got_auth == 1) {
5450                                 /* skip this chunk... it's already auth'd */
5451                                 goto next_chunk;
5452                         }
5453                         got_auth = 1;
5454                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5455                             m, *offset)) {
5456                                 /* auth HMAC failed so dump the packet */
5457                                 *offset = length;
5458                                 return (stcb);
5459                         } else {
5460                                 /* remaining chunks are HMAC checked */
5461                                 stcb->asoc.authenticated = 1;
5462                         }
5463                         break;
5464
5465                 default:
5466         unknown_chunk:
5467                         /* it's an unknown chunk! */
5468                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5469                                 struct mbuf *mm;
5470                                 struct sctp_paramhdr *phd;
5471
5472                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5473                                     0, M_NOWAIT, 1, MT_DATA);
5474                                 if (mm) {
5475                                         phd = mtod(mm, struct sctp_paramhdr *);
5476                                         /*
5477                                          * We cheat and use param type since
5478                                          * we did not bother to define a
5479                                          * error cause struct. They are the
5480                                          * same basic format with different
5481                                          * names.
5482                                          */
5483                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5484                                         phd->param_length = htons(chk_length + sizeof(*phd));
5485                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5486                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT);
5487                                         if (SCTP_BUF_NEXT(mm)) {
5488                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL) == NULL) {
5489                                                         sctp_m_freem(mm);
5490                                                 } else {
5491 #ifdef SCTP_MBUF_LOGGING
5492                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5493                                                                 struct mbuf *mat;
5494
5495                                                                 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) {
5496                                                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5497                                                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5498                                                                         }
5499                                                                 }
5500                                                         }
5501 #endif
5502                                                         sctp_queue_op_err(stcb, mm);
5503                                                 }
5504                                         } else {
5505                                                 sctp_m_freem(mm);
5506                                         }
5507                                 }
5508                         }
5509                         if ((ch->chunk_type & 0x80) == 0) {
5510                                 /* discard this packet */
5511                                 *offset = length;
5512                                 return (stcb);
5513                         }       /* else skip this bad chunk and continue... */
5514                         break;
5515                 }               /* switch (ch->chunk_type) */
5516
5517
5518 next_chunk:
5519                 /* get the next chunk */
5520                 *offset += SCTP_SIZE32(chk_length);
5521                 if (*offset >= length) {
5522                         /* no more data left in the mbuf chain */
5523                         break;
5524                 }
5525                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5526                     sizeof(struct sctp_chunkhdr), chunk_buf);
5527                 if (ch == NULL) {
5528                         if (locked_tcb) {
5529                                 SCTP_TCB_UNLOCK(locked_tcb);
5530                         }
5531                         *offset = length;
5532                         return (NULL);
5533                 }
5534         }                       /* while */
5535
5536         if (asconf_cnt > 0 && stcb != NULL) {
5537                 sctp_send_asconf_ack(stcb);
5538         }
5539         return (stcb);
5540 }
5541
5542
5543 #ifdef INVARIANTS
5544 #ifdef __GNUC__
5545 __attribute__((noinline))
5546 #endif
5547         void
5548              sctp_validate_no_locks(struct sctp_inpcb *inp)
5549 {
5550         struct sctp_tcb *lstcb;
5551
5552         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5553                 if (mtx_owned(&lstcb->tcb_mtx)) {
5554                         panic("Own lock on stcb at return from input");
5555                 }
5556         }
5557         if (mtx_owned(&inp->inp_create_mtx)) {
5558                 panic("Own create lock on inp");
5559         }
5560         if (mtx_owned(&inp->inp_mtx)) {
5561                 panic("Own inp lock on inp");
5562         }
5563 }
5564
5565 #endif
5566
5567 /*
5568  * common input chunk processing (v4 and v6)
5569  */
5570 void
5571 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5572     struct sockaddr *src, struct sockaddr *dst,
5573     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5574 #if !defined(SCTP_WITH_NO_CSUM)
5575     uint8_t compute_crc,
5576 #endif
5577     uint8_t ecn_bits,
5578     uint8_t use_mflowid, uint32_t mflowid,
5579     uint32_t vrf_id, uint16_t port)
5580 {
5581         uint32_t high_tsn;
5582         int fwd_tsn_seen = 0, data_processed = 0;
5583         struct mbuf *m = *mm, *op_err;
5584         char msg[SCTP_DIAG_INFO_LEN];
5585         int un_sent;
5586         int cnt_ctrl_ready = 0;
5587         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5588         struct sctp_tcb *stcb = NULL;
5589         struct sctp_nets *net = NULL;
5590
5591         SCTP_STAT_INCR(sctps_recvdatagrams);
5592 #ifdef SCTP_AUDITING_ENABLED
5593         sctp_audit_log(0xE0, 1);
5594         sctp_auditing(0, inp, stcb, net);
5595 #endif
5596 #if !defined(SCTP_WITH_NO_CSUM)
5597         if (compute_crc != 0) {
5598                 uint32_t check, calc_check;
5599
5600                 check = sh->checksum;
5601                 sh->checksum = 0;
5602                 calc_check = sctp_calculate_cksum(m, iphlen);
5603                 sh->checksum = check;
5604                 if (calc_check != check) {
5605                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5606                             calc_check, check, (void *)m, length, iphlen);
5607                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5608                             sh, ch, &inp, &net, vrf_id);
5609 #if defined(INET) || defined(INET6)
5610                         if ((net != NULL) && (port != 0)) {
5611                                 if (net->port == 0) {
5612                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5613                                 }
5614                                 net->port = port;
5615                         }
5616 #endif
5617                         if ((net != NULL) && (use_mflowid != 0)) {
5618                                 net->flowid = mflowid;
5619 #ifdef INVARIANTS
5620                                 net->flowidset = 1;
5621 #endif
5622                         }
5623                         if ((inp != NULL) && (stcb != NULL)) {
5624                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5625                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5626                         } else if ((inp != NULL) && (stcb == NULL)) {
5627                                 inp_decr = inp;
5628                         }
5629                         SCTP_STAT_INCR(sctps_badsum);
5630                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5631                         goto out;
5632                 }
5633         }
5634 #endif
5635         /* Destination port of 0 is illegal, based on RFC4960. */
5636         if (sh->dest_port == 0) {
5637                 SCTP_STAT_INCR(sctps_hdrops);
5638                 goto out;
5639         }
5640         stcb = sctp_findassociation_addr(m, offset, src, dst,
5641             sh, ch, &inp, &net, vrf_id);
5642 #if defined(INET) || defined(INET6)
5643         if ((net != NULL) && (port != 0)) {
5644                 if (net->port == 0) {
5645                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5646                 }
5647                 net->port = port;
5648         }
5649 #endif
5650         if ((net != NULL) && (use_mflowid != 0)) {
5651                 net->flowid = mflowid;
5652 #ifdef INVARIANTS
5653                 net->flowidset = 1;
5654 #endif
5655         }
5656         if (inp == NULL) {
5657                 SCTP_STAT_INCR(sctps_noport);
5658                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5659                         goto out;
5660                 }
5661                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5662                         sctp_send_shutdown_complete2(src, dst, sh,
5663                             use_mflowid, mflowid,
5664                             vrf_id, port);
5665                         goto out;
5666                 }
5667                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5668                         goto out;
5669                 }
5670                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5671                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5672                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5673                             (ch->chunk_type != SCTP_INIT))) {
5674                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5675                                     "Out of the blue");
5676                                 sctp_send_abort(m, iphlen, src, dst,
5677                                     sh, 0, op_err,
5678                                     use_mflowid, mflowid,
5679                                     vrf_id, port);
5680                         }
5681                 }
5682                 goto out;
5683         } else if (stcb == NULL) {
5684                 inp_decr = inp;
5685         }
5686 #ifdef IPSEC
5687         /*-
5688          * I very much doubt any of the IPSEC stuff will work but I have no
5689          * idea, so I will leave it in place.
5690          */
5691         if (inp != NULL) {
5692                 switch (dst->sa_family) {
5693 #ifdef INET
5694                 case AF_INET:
5695                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5696                                 IPSECSTAT_INC(ips_in_polvio);
5697                                 SCTP_STAT_INCR(sctps_hdrops);
5698                                 goto out;
5699                         }
5700                         break;
5701 #endif
5702 #ifdef INET6
5703                 case AF_INET6:
5704                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5705                                 IPSEC6STAT_INC(ips_in_polvio);
5706                                 SCTP_STAT_INCR(sctps_hdrops);
5707                                 goto out;
5708                         }
5709                         break;
5710 #endif
5711                 default:
5712                         break;
5713                 }
5714         }
5715 #endif
5716         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5717             (void *)m, iphlen, offset, length, (void *)stcb);
5718         if (stcb) {
5719                 /* always clear this before beginning a packet */
5720                 stcb->asoc.authenticated = 0;
5721                 stcb->asoc.seen_a_sack_this_pkt = 0;
5722                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5723                     (void *)stcb, stcb->asoc.state);
5724
5725                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5726                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5727                         /*-
5728                          * If we hit here, we had a ref count
5729                          * up when the assoc was aborted and the
5730                          * timer is clearing out the assoc, we should
5731                          * NOT respond to any packet.. its OOTB.
5732                          */
5733                         SCTP_TCB_UNLOCK(stcb);
5734                         stcb = NULL;
5735                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5736                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5737                             msg);
5738                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5739                             use_mflowid, mflowid,
5740                             vrf_id, port);
5741                         goto out;
5742                 }
5743         }
5744         if (IS_SCTP_CONTROL(ch)) {
5745                 /* process the control portion of the SCTP packet */
5746                 /* sa_ignore NO_NULL_CHK */
5747                 stcb = sctp_process_control(m, iphlen, &offset, length,
5748                     src, dst, sh, ch,
5749                     inp, stcb, &net, &fwd_tsn_seen,
5750                     use_mflowid, mflowid,
5751                     vrf_id, port);
5752                 if (stcb) {
5753                         /*
5754                          * This covers us if the cookie-echo was there and
5755                          * it changes our INP.
5756                          */
5757                         inp = stcb->sctp_ep;
5758 #if defined(INET) || defined(INET6)
5759                         if ((net) && (port)) {
5760                                 if (net->port == 0) {
5761                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5762                                 }
5763                                 net->port = port;
5764                         }
5765 #endif
5766                 }
5767         } else {
5768                 /*
5769                  * no control chunks, so pre-process DATA chunks (these
5770                  * checks are taken care of by control processing)
5771                  */
5772
5773                 /*
5774                  * if DATA only packet, and auth is required, then punt...
5775                  * can't have authenticated without any AUTH (control)
5776                  * chunks
5777                  */
5778                 if ((stcb != NULL) &&
5779                     !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5780                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5781                         /* "silently" ignore */
5782                         SCTP_STAT_INCR(sctps_recvauthmissing);
5783                         goto out;
5784                 }
5785                 if (stcb == NULL) {
5786                         /* out of the blue DATA chunk */
5787                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5788                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5789                             msg);
5790                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5791                             use_mflowid, mflowid,
5792                             vrf_id, port);
5793                         goto out;
5794                 }
5795                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5796                         /* v_tag mismatch! */
5797                         SCTP_STAT_INCR(sctps_badvtag);
5798                         goto out;
5799                 }
5800         }
5801
5802         if (stcb == NULL) {
5803                 /*
5804                  * no valid TCB for this packet, or we found it's a bad
5805                  * packet while processing control, or we're done with this
5806                  * packet (done or skip rest of data), so we drop it...
5807                  */
5808                 goto out;
5809         }
5810         /*
5811          * DATA chunk processing
5812          */
5813         /* plow through the data chunks while length > offset */
5814
5815         /*
5816          * Rest should be DATA only.  Check authentication state if AUTH for
5817          * DATA is required.
5818          */
5819         if ((length > offset) &&
5820             (stcb != NULL) &&
5821             !SCTP_BASE_SYSCTL(sctp_auth_disable) &&
5822             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5823             !stcb->asoc.authenticated) {
5824                 /* "silently" ignore */
5825                 SCTP_STAT_INCR(sctps_recvauthmissing);
5826                 SCTPDBG(SCTP_DEBUG_AUTH1,
5827                     "Data chunk requires AUTH, skipped\n");
5828                 goto trigger_send;
5829         }
5830         if (length > offset) {
5831                 int retval;
5832
5833                 /*
5834                  * First check to make sure our state is correct. We would
5835                  * not get here unless we really did have a tag, so we don't
5836                  * abort if this happens, just dump the chunk silently.
5837                  */
5838                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5839                 case SCTP_STATE_COOKIE_ECHOED:
5840                         /*
5841                          * we consider data with valid tags in this state
5842                          * shows us the cookie-ack was lost. Imply it was
5843                          * there.
5844                          */
5845                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5846                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5847                                     stcb->asoc.overall_error_count,
5848                                     0,
5849                                     SCTP_FROM_SCTP_INPUT,
5850                                     __LINE__);
5851                         }
5852                         stcb->asoc.overall_error_count = 0;
5853                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5854                         break;
5855                 case SCTP_STATE_COOKIE_WAIT:
5856                         /*
5857                          * We consider OOTB any data sent during asoc setup.
5858                          */
5859                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5860                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5861                             msg);
5862                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5863                             use_mflowid, mflowid,
5864                             vrf_id, port);
5865                         goto out;
5866                         /* sa_ignore NOTREACHED */
5867                         break;
5868                 case SCTP_STATE_EMPTY:  /* should not happen */
5869                 case SCTP_STATE_INUSE:  /* should not happen */
5870                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5871                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5872                 default:
5873                         goto out;
5874                         /* sa_ignore NOTREACHED */
5875                         break;
5876                 case SCTP_STATE_OPEN:
5877                 case SCTP_STATE_SHUTDOWN_SENT:
5878                         break;
5879                 }
5880                 /* plow through the data chunks while length > offset */
5881                 retval = sctp_process_data(mm, iphlen, &offset, length,
5882                     src, dst, sh,
5883                     inp, stcb, net, &high_tsn,
5884                     use_mflowid, mflowid,
5885                     vrf_id, port);
5886                 if (retval == 2) {
5887                         /*
5888                          * The association aborted, NO UNLOCK needed since
5889                          * the association is destroyed.
5890                          */
5891                         stcb = NULL;
5892                         goto out;
5893                 }
5894                 data_processed = 1;
5895                 /*
5896                  * Anything important needs to have been m_copy'ed in
5897                  * process_data
5898                  */
5899         }
5900         /* take care of ecn */
5901         if ((data_processed == 1) &&
5902             (stcb->asoc.ecn_supported == 1) &&
5903             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5904                 /* Yep, we need to add a ECNE */
5905                 sctp_send_ecn_echo(stcb, net, high_tsn);
5906         }
5907         if ((data_processed == 0) && (fwd_tsn_seen)) {
5908                 int was_a_gap;
5909                 uint32_t highest_tsn;
5910
5911                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5912                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5913                 } else {
5914                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5915                 }
5916                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5917                 stcb->asoc.send_sack = 1;
5918                 sctp_sack_check(stcb, was_a_gap);
5919         } else if (fwd_tsn_seen) {
5920                 stcb->asoc.send_sack = 1;
5921         }
5922         /* trigger send of any chunks in queue... */
5923 trigger_send:
5924 #ifdef SCTP_AUDITING_ENABLED
5925         sctp_audit_log(0xE0, 2);
5926         sctp_auditing(1, inp, stcb, net);
5927 #endif
5928         SCTPDBG(SCTP_DEBUG_INPUT1,
5929             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5930             stcb->asoc.peers_rwnd,
5931             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5932             stcb->asoc.total_flight);
5933         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5934         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5935                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5936         }
5937         if (cnt_ctrl_ready ||
5938             ((un_sent) &&
5939             (stcb->asoc.peers_rwnd > 0 ||
5940             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5941                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5942                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5943                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5944         }
5945 #ifdef SCTP_AUDITING_ENABLED
5946         sctp_audit_log(0xE0, 3);
5947         sctp_auditing(2, inp, stcb, net);
5948 #endif
5949 out:
5950         if (stcb != NULL) {
5951                 SCTP_TCB_UNLOCK(stcb);
5952         }
5953         if (inp_decr != NULL) {
5954                 /* reduce ref-count */
5955                 SCTP_INP_WLOCK(inp_decr);
5956                 SCTP_INP_DECR_REF(inp_decr);
5957                 SCTP_INP_WUNLOCK(inp_decr);
5958         }
5959 #ifdef INVARIANTS
5960         if (inp != NULL) {
5961                 sctp_validate_no_locks(inp);
5962         }
5963 #endif
5964         return;
5965 }
5966
5967 #if 0
5968 static void
5969 sctp_print_mbuf_chain(struct mbuf *m)
5970 {
5971         for (; m; m = SCTP_BUF_NEXT(m)) {
5972                 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
5973                 if (SCTP_BUF_IS_EXTENDED(m))
5974                         SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
5975         }
5976 }
5977
5978 #endif
5979
5980 #ifdef INET
5981 void
5982 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5983 {
5984         struct mbuf *m;
5985         int iphlen;
5986         uint32_t vrf_id = 0;
5987         uint8_t ecn_bits;
5988         struct sockaddr_in src, dst;
5989         struct ip *ip;
5990         struct sctphdr *sh;
5991         struct sctp_chunkhdr *ch;
5992         int length, offset;
5993
5994 #if !defined(SCTP_WITH_NO_CSUM)
5995         uint8_t compute_crc;
5996
5997 #endif
5998         uint32_t mflowid;
5999         uint8_t use_mflowid;
6000
6001         iphlen = off;
6002         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6003                 SCTP_RELEASE_PKT(i_pak);
6004                 return;
6005         }
6006         m = SCTP_HEADER_TO_CHAIN(i_pak);
6007 #ifdef SCTP_MBUF_LOGGING
6008         /* Log in any input mbufs */
6009         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6010                 struct mbuf *mat;
6011
6012                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6013                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6014                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
6015                         }
6016                 }
6017         }
6018 #endif
6019 #ifdef SCTP_PACKET_LOGGING
6020         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6021                 sctp_packet_log(m);
6022         }
6023 #endif
6024         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6025             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6026             m->m_pkthdr.len,
6027             if_name(m->m_pkthdr.rcvif),
6028             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6029         if (m->m_flags & M_FLOWID) {
6030                 mflowid = m->m_pkthdr.flowid;
6031                 use_mflowid = 1;
6032         } else {
6033                 mflowid = 0;
6034                 use_mflowid = 0;
6035         }
6036         SCTP_STAT_INCR(sctps_recvpackets);
6037         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6038         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6039         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6040         if (SCTP_BUF_LEN(m) < offset) {
6041                 if ((m = m_pullup(m, offset)) == NULL) {
6042                         SCTP_STAT_INCR(sctps_hdrops);
6043                         return;
6044                 }
6045         }
6046         ip = mtod(m, struct ip *);
6047         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6048         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6049         offset -= sizeof(struct sctp_chunkhdr);
6050         memset(&src, 0, sizeof(struct sockaddr_in));
6051         src.sin_family = AF_INET;
6052         src.sin_len = sizeof(struct sockaddr_in);
6053         src.sin_port = sh->src_port;
6054         src.sin_addr = ip->ip_src;
6055         memset(&dst, 0, sizeof(struct sockaddr_in));
6056         dst.sin_family = AF_INET;
6057         dst.sin_len = sizeof(struct sockaddr_in);
6058         dst.sin_port = sh->dest_port;
6059         dst.sin_addr = ip->ip_dst;
6060         length = ntohs(ip->ip_len);
6061         /* Validate mbuf chain length with IP payload length. */
6062         if (SCTP_HEADER_LEN(m) != length) {
6063                 SCTPDBG(SCTP_DEBUG_INPUT1,
6064                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6065                 SCTP_STAT_INCR(sctps_hdrops);
6066                 goto out;
6067         }
6068         /* SCTP does not allow broadcasts or multicasts */
6069         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6070                 goto out;
6071         }
6072         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6073                 goto out;
6074         }
6075         ecn_bits = ip->ip_tos;
6076 #if defined(SCTP_WITH_NO_CSUM)
6077         SCTP_STAT_INCR(sctps_recvnocrc);
6078 #else
6079         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6080                 SCTP_STAT_INCR(sctps_recvhwcrc);
6081                 compute_crc = 0;
6082         } else {
6083                 SCTP_STAT_INCR(sctps_recvswcrc);
6084                 compute_crc = 1;
6085         }
6086 #endif
6087         sctp_common_input_processing(&m, iphlen, offset, length,
6088             (struct sockaddr *)&src,
6089             (struct sockaddr *)&dst,
6090             sh, ch,
6091 #if !defined(SCTP_WITH_NO_CSUM)
6092             compute_crc,
6093 #endif
6094             ecn_bits,
6095             use_mflowid, mflowid,
6096             vrf_id, port);
6097 out:
6098         if (m) {
6099                 sctp_m_freem(m);
6100         }
6101         return;
6102 }
6103
6104 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6105 extern int *sctp_cpuarry;
6106
6107 #endif
6108
6109 void
6110 sctp_input(struct mbuf *m, int off)
6111 {
6112 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6113         struct ip *ip;
6114         struct sctphdr *sh;
6115         int offset;
6116         int cpu_to_use;
6117         uint32_t flowid, tag;
6118
6119         if (mp_ncpus > 1) {
6120                 if (m->m_flags & M_FLOWID) {
6121                         flowid = m->m_pkthdr.flowid;
6122                 } else {
6123                         /*
6124                          * No flow id built by lower layers fix it so we
6125                          * create one.
6126                          */
6127                         offset = off + sizeof(struct sctphdr);
6128                         if (SCTP_BUF_LEN(m) < offset) {
6129                                 if ((m = m_pullup(m, offset)) == NULL) {
6130                                         SCTP_STAT_INCR(sctps_hdrops);
6131                                         return;
6132                                 }
6133                         }
6134                         ip = mtod(m, struct ip *);
6135                         sh = (struct sctphdr *)((caddr_t)ip + off);
6136                         tag = htonl(sh->v_tag);
6137                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6138                         m->m_pkthdr.flowid = flowid;
6139                         m->m_flags |= M_FLOWID;
6140                 }
6141                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6142                 sctp_queue_to_mcore(m, off, cpu_to_use);
6143                 return;
6144         }
6145 #endif
6146         sctp_input_with_port(m, off, 0);
6147 }
6148
6149 #endif