sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_input.h>
  44 #include <netinet/sctp_auth.h>
  45 #include <netinet/sctp_indata.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctp_bsd_addr.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_crc32.h>
  50 #if defined(INET) || defined(INET6)
  51 #include <netinet/udp.h>
  52 #endif
  53 #include <sys/smp.h>
  54
  55
  56
  57 static void
  58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  59 {
  60         struct sctp_nets *net;
  61
  62         /*
  63          * This now not only stops all cookie timers it also stops any INIT
  64          * timers as well. This will make sure that the timers are stopped
  65          * in all collision cases.
  66          */
  67         SCTP_TCB_LOCK_ASSERT(stcb);
  68         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  69                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  70                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  71                             stcb->sctp_ep,
  72                             stcb,
  73                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  74                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  75                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  76                             stcb->sctp_ep,
  77                             stcb,
  78                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  79                 }
  80         }
  81 }
  82
  83 /* INIT handler */
  84 static void
  85 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  86     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  87     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  88     struct sctp_tcb *stcb, int *abort_no_unlock,
  89     uint8_t mflowtype, uint32_t mflowid,
  90     uint32_t vrf_id, uint16_t port)
  91 {
  92         struct sctp_init *init;
  93         struct mbuf *op_err;
  94
  95         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  96             (void *)stcb);
  97         if (stcb == NULL) {
  98                 SCTP_INP_RLOCK(inp);
  99         }
 100         /* validate length */
 101         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 102                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 103                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 104                     mflowtype, mflowid,
 105                     vrf_id, port);
 106                 if (stcb)
 107                         *abort_no_unlock = 1;
 108                 goto outnow;
 109         }
 110         /* validate parameters */
 111         init = &cp->init;
 112         if (init->initiate_tag == 0) {
 113                 /* protocol error... send abort */
 114                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 115                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 116                     mflowtype, mflowid,
 117                     vrf_id, port);
 118                 if (stcb)
 119                         *abort_no_unlock = 1;
 120                 goto outnow;
 121         }
 122         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 123                 /* invalid parameter... send abort */
 124                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 125                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 126                     mflowtype, mflowid,
 127                     vrf_id, port);
 128                 if (stcb)
 129                         *abort_no_unlock = 1;
 130                 goto outnow;
 131         }
 132         if (init->num_inbound_streams == 0) {
 133                 /* protocol error... send abort */
 134                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 135                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 136                     mflowtype, mflowid,
 137                     vrf_id, port);
 138                 if (stcb)
 139                         *abort_no_unlock = 1;
 140                 goto outnow;
 141         }
 142         if (init->num_outbound_streams == 0) {
 143                 /* protocol error... send abort */
 144                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 145                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 146                     mflowtype, mflowid,
 147                     vrf_id, port);
 148                 if (stcb)
 149                         *abort_no_unlock = 1;
 150                 goto outnow;
 151         }
 152         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 153             offset + ntohs(cp->ch.chunk_length))) {
 154                 /* auth parameter(s) error... send abort */
 155                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 156                     "Problem with AUTH parameters");
 157                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 158                     mflowtype, mflowid,
 159                     vrf_id, port);
 160                 if (stcb)
 161                         *abort_no_unlock = 1;
 162                 goto outnow;
 163         }
 164         /*
 165          * We are only accepting if we have a socket with positive
 166          * so_qlimit.
 167          */
 168         if ((stcb == NULL) &&
 169             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 170             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 171             (inp->sctp_socket == NULL) ||
 172             (inp->sctp_socket->so_qlimit == 0))) {
 173                 /*
 174                  * FIX ME ?? What about TCP model and we have a
 175                  * match/restart case? Actually no fix is needed. the lookup
 176                  * will always find the existing assoc so stcb would not be
 177                  * NULL. It may be questionable to do this since we COULD
 178                  * just send back the INIT-ACK and hope that the app did
 179                  * accept()'s by the time the COOKIE was sent. But there is
 180                  * a price to pay for COOKIE generation and I don't want to
 181                  * pay it on the chance that the app will actually do some
 182                  * accepts(). The App just looses and should NOT be in this
 183                  * state :-)
 184                  */
 185                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 186                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 187                             "No listener");
 188                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 189                             mflowtype, mflowid,
 190                             vrf_id, port);
 191                 }
 192                 goto outnow;
 193         }
 194         if ((stcb != NULL) &&
 195             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 196                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 197                 sctp_send_shutdown_ack(stcb, NULL);
 198                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 199         } else {
 200                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 201                 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst,
 202                     sh, cp,
 203                     mflowtype, mflowid,
 204                     vrf_id, port,
 205                     ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 206         }
 207 outnow:
 208         if (stcb == NULL) {
 209                 SCTP_INP_RUNLOCK(inp);
 210         }
 211 }
 212
 213 /*
 214  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 215  */
 216
 217 int
 218 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 219 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 220     SCTP_UNUSED
 221 #endif
 222 )
 223 {
 224         int unsent_data = 0;
 225         unsigned int i;
 226         struct sctp_stream_queue_pending *sp;
 227         struct sctp_association *asoc;
 228
 229         /*
 230          * This function returns the number of streams that have true unsent
 231          * data on them. Note that as it looks through it will clean up any
 232          * places that have old data that has been sent but left at top of
 233          * stream queue.
 234          */
 235         asoc = &stcb->asoc;
 236         SCTP_TCB_SEND_LOCK(stcb);
 237         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 238                 /* Check to see if some data queued */
 239                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 240                         /* sa_ignore FREED_MEMORY */
 241                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 242                         if (sp == NULL) {
 243                                 continue;
 244                         }
 245                         if ((sp->msg_is_complete) &&
 246                             (sp->length == 0) &&
 247                             (sp->sender_all_done)) {
 248                                 /*
 249                                  * We are doing differed cleanup. Last time
 250                                  * through when we took all the data the
 251                                  * sender_all_done was not set.
 252                                  */
 253                                 if (sp->put_last_out == 0) {
 254                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 255                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 256                                             sp->sender_all_done,
 257                                             sp->length,
 258                                             sp->msg_is_complete,
 259                                             sp->put_last_out);
 260                                 }
 261                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 262                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 263                                 if (sp->net) {
 264                                         sctp_free_remote_addr(sp->net);
 265                                         sp->net = NULL;
 266                                 }
 267                                 if (sp->data) {
 268                                         sctp_m_freem(sp->data);
 269                                         sp->data = NULL;
 270                                 }
 271                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 272                         } else {
 273                                 unsent_data++;
 274                                 break;
 275                         }
 276                 }
 277         }
 278         SCTP_TCB_SEND_UNLOCK(stcb);
 279         return (unsent_data);
 280 }
 281
 282 static int
 283 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 284 {
 285         struct sctp_init *init;
 286         struct sctp_association *asoc;
 287         struct sctp_nets *lnet;
 288         unsigned int i;
 289
 290         init = &cp->init;
 291         asoc = &stcb->asoc;
 292         /* save off parameters */
 293         asoc->peer_vtag = ntohl(init->initiate_tag);
 294         asoc->peers_rwnd = ntohl(init->a_rwnd);
 295         /* init tsn's */
 296         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 297
 298         if (!TAILQ_EMPTY(&asoc->nets)) {
 299                 /* update any ssthresh's that may have a default */
 300                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 301                         lnet->ssthresh = asoc->peers_rwnd;
 302                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 303                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 304                         }
 305                 }
 306         }
 307         SCTP_TCB_SEND_LOCK(stcb);
 308         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 309                 unsigned int newcnt;
 310                 struct sctp_stream_out *outs;
 311                 struct sctp_stream_queue_pending *sp, *nsp;
 312                 struct sctp_tmit_chunk *chk, *nchk;
 313
 314                 /* abandon the upper streams */
 315                 newcnt = ntohs(init->num_inbound_streams);
 316                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 317                         if (chk->rec.data.stream_number >= newcnt) {
 318                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 319                                 asoc->send_queue_cnt--;
 320                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
 321                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
 322 #ifdef INVARIANTS
 323                                 } else {
 324                                         panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
 325 #endif
 326                                 }
 327                                 if (chk->data != NULL) {
 328                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 329                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 330                                             0, chk, SCTP_SO_NOT_LOCKED);
 331                                         if (chk->data) {
 332                                                 sctp_m_freem(chk->data);
 333                                                 chk->data = NULL;
 334                                         }
 335                                 }
 336                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 337                                 /* sa_ignore FREED_MEMORY */
 338                         }
 339                 }
 340                 if (asoc->strmout) {
 341                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 342                                 outs = &asoc->strmout[i];
 343                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 344                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 345                                         asoc->stream_queue_cnt--;
 346                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 347                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 348                                         if (sp->data) {
 349                                                 sctp_m_freem(sp->data);
 350                                                 sp->data = NULL;
 351                                         }
 352                                         if (sp->net) {
 353                                                 sctp_free_remote_addr(sp->net);
 354                                                 sp->net = NULL;
 355                                         }
 356                                         /* Free the chunk */
 357                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 358                                         /* sa_ignore FREED_MEMORY */
 359                                 }
 360                         }
 361                 }
 362                 /* cut back the count */
 363                 asoc->pre_open_streams = newcnt;
 364         }
 365         SCTP_TCB_SEND_UNLOCK(stcb);
 366         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 367
 368         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 369         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 370         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 371                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 372         }
 373         /* This is the next one we expect */
 374         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 375
 376         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 377         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 378
 379         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 380         /* open the requested streams */
 381
 382         if (asoc->strmin != NULL) {
 383                 /* Free the old ones */
 384                 struct sctp_queued_to_read *ctl, *nctl;
 385
 386                 for (i = 0; i < asoc->streamincnt; i++) {
 387                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 388                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 389                                 sctp_free_remote_addr(ctl->whoFrom);
 390                                 ctl->whoFrom = NULL;
 391                                 sctp_m_freem(ctl->data);
 392                                 ctl->data = NULL;
 393                                 sctp_free_a_readq(stcb, ctl);
 394                         }
 395                 }
 396                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 397         }
 398         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 399                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 400         } else {
 401                 asoc->streamincnt = asoc->max_inbound_streams;
 402         }
 403         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 404             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 405         if (asoc->strmin == NULL) {
 406                 /* we didn't get memory for the streams! */
 407                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 408                 return (-1);
 409         }
 410         for (i = 0; i < asoc->streamincnt; i++) {
 411                 asoc->strmin[i].stream_no = i;
 412                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 413                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 414                 asoc->strmin[i].delivery_started = 0;
 415         }
 416         /*
 417          * load_address_from_init will put the addresses into the
 418          * association when the COOKIE is processed or the INIT-ACK is
 419          * processed. Both types of COOKIE's existing and new call this
 420          * routine. It will remove addresses that are no longer in the
 421          * association (for the restarting case where addresses are
 422          * removed). Up front when the INIT arrives we will discard it if it
 423          * is a restart and new addresses have been added.
 424          */
 425         /* sa_ignore MEMLEAK */
 426         return (0);
 427 }
 428
 429 /*
 430  * INIT-ACK message processing/consumption returns value < 0 on error
 431  */
 432 static int
 433 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 434     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 435     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 436     struct sctp_nets *net, int *abort_no_unlock,
 437     uint8_t mflowtype, uint32_t mflowid,
 438     uint32_t vrf_id)
 439 {
 440         struct sctp_association *asoc;
 441         struct mbuf *op_err;
 442         int retval, abort_flag;
 443         uint32_t initack_limit;
 444         int nat_friendly = 0;
 445
 446         /* First verify that we have no illegal param's */
 447         abort_flag = 0;
 448
 449         op_err = sctp_arethere_unrecognized_parameters(m,
 450             (offset + sizeof(struct sctp_init_chunk)),
 451             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 452         if (abort_flag) {
 453                 /* Send an abort and notify peer */
 454                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 455                 *abort_no_unlock = 1;
 456                 return (-1);
 457         }
 458         asoc = &stcb->asoc;
 459         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 460         /* process the peer's parameters in the INIT-ACK */
 461         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 462         if (retval < 0) {
 463                 return (retval);
 464         }
 465         initack_limit = offset + ntohs(cp->ch.chunk_length);
 466         /* load all addresses */
 467         if ((retval = sctp_load_addresses_from_init(stcb, m,
 468             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 469             src, dst, NULL))) {
 470                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 471                     "Problem with address parameters");
 472                 SCTPDBG(SCTP_DEBUG_INPUT1,
 473                     "Load addresses from INIT causes an abort %d\n",
 474                     retval);
 475                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 476                     src, dst, sh, op_err,
 477                     mflowtype, mflowid,
 478                     vrf_id, net->port);
 479                 *abort_no_unlock = 1;
 480                 return (-1);
 481         }
 482         /* if the peer doesn't support asconf, flush the asconf queue */
 483         if (asoc->asconf_supported == 0) {
 484                 struct sctp_asconf_addr *param, *nparam;
 485
 486                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 487                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 488                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 489                 }
 490         }
 491         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 492             stcb->asoc.local_hmacs);
 493         if (op_err) {
 494                 sctp_queue_op_err(stcb, op_err);
 495                 /* queuing will steal away the mbuf chain to the out queue */
 496                 op_err = NULL;
 497         }
 498         /* extract the cookie and queue it to "echo" it back... */
 499         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 500                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 501                     stcb->asoc.overall_error_count,
 502                     0,
 503                     SCTP_FROM_SCTP_INPUT,
 504                     __LINE__);
 505         }
 506         stcb->asoc.overall_error_count = 0;
 507         net->error_count = 0;
 508
 509         /*
 510          * Cancel the INIT timer, We do this first before queueing the
 511          * cookie. We always cancel at the primary to assue that we are
 512          * canceling the timer started by the INIT which always goes to the
 513          * primary.
 514          */
 515         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 516             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 517
 518         /* calculate the RTO */
 519         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 520             SCTP_RTT_FROM_NON_DATA);
 521
 522         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 523         if (retval < 0) {
 524                 /*
 525                  * No cookie, we probably should send a op error. But in any
 526                  * case if there is no cookie in the INIT-ACK, we can
 527                  * abandon the peer, its broke.
 528                  */
 529                 if (retval == -3) {
 530                         /* We abort with an error of missing mandatory param */
 531                         op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, "");
 532                         if (op_err) {
 533                                 /*
 534                                  * Expand beyond to include the mandatory
 535                                  * param cookie
 536                                  */
 537                                 struct sctp_inv_mandatory_param *mp;
 538
 539                                 SCTP_BUF_LEN(op_err) =
 540                                     sizeof(struct sctp_inv_mandatory_param);
 541                                 mp = mtod(op_err,
 542                                     struct sctp_inv_mandatory_param *);
 543                                 /* Subtract the reserved param */
 544                                 mp->length =
 545                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 546                                 mp->num_param = htonl(1);
 547                                 mp->param = htons(SCTP_STATE_COOKIE);
 548                                 mp->resv = 0;
 549                         }
 550                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 551                             src, dst, sh, op_err,
 552                             mflowtype, mflowid,
 553                             vrf_id, net->port);
 554                         *abort_no_unlock = 1;
 555                 }
 556                 return (retval);
 557         }
 558         return (0);
 559 }
 560
 561 static void
 562 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 563     struct sctp_tcb *stcb, struct sctp_nets *net)
 564 {
 565         union sctp_sockstore store;
 566         struct sctp_nets *r_net, *f_net;
 567         struct timeval tv;
 568         int req_prim = 0;
 569         uint16_t old_error_counter;
 570
 571         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 572                 /* Invalid length */
 573                 return;
 574         }
 575         memset(&store, 0, sizeof(store));
 576         switch (cp->heartbeat.hb_info.addr_family) {
 577 #ifdef INET
 578         case AF_INET:
 579                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 580                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 581                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 582                         store.sin.sin_port = stcb->rport;
 583                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 584                             sizeof(store.sin.sin_addr));
 585                 } else {
 586                         return;
 587                 }
 588                 break;
 589 #endif
 590 #ifdef INET6
 591         case AF_INET6:
 592                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 593                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 594                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 595                         store.sin6.sin6_port = stcb->rport;
 596                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 597                 } else {
 598                         return;
 599                 }
 600                 break;
 601 #endif
 602         default:
 603                 return;
 604         }
 605         r_net = sctp_findnet(stcb, &store.sa);
 606         if (r_net == NULL) {
 607                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 608                 return;
 609         }
 610         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 611             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 612             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 613                 /*
 614                  * If the its a HB and it's random value is correct when can
 615                  * confirm the destination.
 616                  */
 617                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 618                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 619                         stcb->asoc.primary_destination = r_net;
 620                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 621                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 622                         if (f_net != r_net) {
 623                                 /*
 624                                  * first one on the list is NOT the primary
 625                                  * sctp_cmpaddr() is much more efficent if
 626                                  * the primary is the first on the list,
 627                                  * make it so.
 628                                  */
 629                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 630                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 631                         }
 632                         req_prim = 1;
 633                 }
 634                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 635                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 636                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 637                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 638         }
 639         old_error_counter = r_net->error_count;
 640         r_net->error_count = 0;
 641         r_net->hb_responded = 1;
 642         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 643         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 644         /* Now lets do a RTO with this */
 645         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 646             SCTP_RTT_FROM_NON_DATA);
 647         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 648                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 649                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 650                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 651         }
 652         if (r_net->dest_state & SCTP_ADDR_PF) {
 653                 r_net->dest_state &= ~SCTP_ADDR_PF;
 654                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 655         }
 656         if (old_error_counter > 0) {
 657                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 658                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 659         }
 660         if (r_net == stcb->asoc.primary_destination) {
 661                 if (stcb->asoc.alternate) {
 662                         /* release the alternate, primary is good */
 663                         sctp_free_remote_addr(stcb->asoc.alternate);
 664                         stcb->asoc.alternate = NULL;
 665                 }
 666         }
 667         /* Mobility adaptation */
 668         if (req_prim) {
 669                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 670                     SCTP_MOBILITY_BASE) ||
 671                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 672                     SCTP_MOBILITY_FASTHANDOFF)) &&
 673                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 674                     SCTP_MOBILITY_PRIM_DELETED)) {
 675
 676                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7);
 677                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 678                             SCTP_MOBILITY_FASTHANDOFF)) {
 679                                 sctp_assoc_immediate_retrans(stcb,
 680                                     stcb->asoc.primary_destination);
 681                         }
 682                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 683                             SCTP_MOBILITY_BASE)) {
 684                                 sctp_move_chunks_from_net(stcb,
 685                                     stcb->asoc.deleted_primary);
 686                         }
 687                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 688                             stcb->asoc.deleted_primary);
 689                 }
 690         }
 691 }
 692
 693 static int
 694 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 695 {
 696         /*
 697          * return 0 means we want you to proceed with the abort non-zero
 698          * means no abort processing
 699          */
 700         struct sctpasochead *head;
 701
 702         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 703                 /* generate a new vtag and send init */
 704                 LIST_REMOVE(stcb, sctp_asocs);
 705                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 706                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 707                 /*
 708                  * put it in the bucket in the vtag hash of assoc's for the
 709                  * system
 710                  */
 711                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 712                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 713                 return (1);
 714         }
 715         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 716                 /*
 717                  * treat like a case where the cookie expired i.e.: - dump
 718                  * current cookie. - generate a new vtag. - resend init.
 719                  */
 720                 /* generate a new vtag and send init */
 721                 LIST_REMOVE(stcb, sctp_asocs);
 722                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 723                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 724                 sctp_stop_all_cookie_timers(stcb);
 725                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 726                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 727                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 728                 /*
 729                  * put it in the bucket in the vtag hash of assoc's for the
 730                  * system
 731                  */
 732                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 733                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 734                 return (1);
 735         }
 736         return (0);
 737 }
 738
 739 static int
 740 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 741     struct sctp_nets *net)
 742 {
 743         /*
 744          * return 0 means we want you to proceed with the abort non-zero
 745          * means no abort processing
 746          */
 747         if (stcb->asoc.auth_supported == 0) {
 748                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 749                 return (0);
 750         }
 751         sctp_asconf_send_nat_state_update(stcb, net);
 752         return (1);
 753 }
 754
 755
 756 static void
 757 sctp_handle_abort(struct sctp_abort_chunk *abort,
 758     struct sctp_tcb *stcb, struct sctp_nets *net)
 759 {
 760 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 761         struct socket *so;
 762
 763 #endif
 764         uint16_t len;
 765         uint16_t error;
 766
 767         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 768         if (stcb == NULL)
 769                 return;
 770
 771         len = ntohs(abort->ch.chunk_length);
 772         if (len > sizeof(struct sctp_chunkhdr)) {
 773                 /*
 774                  * Need to check the cause codes for our two magic nat
 775                  * aborts which don't kill the assoc necessarily.
 776                  */
 777                 struct sctp_missing_nat_state *natc;
 778
 779                 natc = (struct sctp_missing_nat_state *)(abort + 1);
 780                 error = ntohs(natc->cause);
 781                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 782                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 783                             abort->ch.chunk_flags);
 784                         if (sctp_handle_nat_colliding_state(stcb)) {
 785                                 return;
 786                         }
 787                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 788                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 789                             abort->ch.chunk_flags);
 790                         if (sctp_handle_nat_missing_state(stcb, net)) {
 791                                 return;
 792                         }
 793                 }
 794         } else {
 795                 error = 0;
 796         }
 797         /* stop any receive timers */
 798         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 799         /* notify user of the abort and clean up... */
 800         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 801         /* free the tcb */
 802         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 803         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 804             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 805                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 806         }
 807 #ifdef SCTP_ASOCLOG_OF_TSNS
 808         sctp_print_out_track_log(stcb);
 809 #endif
 810 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 811         so = SCTP_INP_SO(stcb->sctp_ep);
 812         atomic_add_int(&stcb->asoc.refcnt, 1);
 813         SCTP_TCB_UNLOCK(stcb);
 814         SCTP_SOCKET_LOCK(so, 1);
 815         SCTP_TCB_LOCK(stcb);
 816         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 817 #endif
 818         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 819         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 820             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 821 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 822         SCTP_SOCKET_UNLOCK(so, 1);
 823 #endif
 824         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 825 }
 826
 827 static void
 828 sctp_start_net_timers(struct sctp_tcb *stcb)
 829 {
 830         uint32_t cnt_hb_sent;
 831         struct sctp_nets *net;
 832
 833         cnt_hb_sent = 0;
 834         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 835                 /*
 836                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 837                  * If the dest in unconfirmed send a hb as well if under
 838                  * max_hb_burst have been sent.
 839                  */
 840                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 841                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 842                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 843                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 844                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 845                         cnt_hb_sent++;
 846                 }
 847         }
 848         if (cnt_hb_sent) {
 849                 sctp_chunk_output(stcb->sctp_ep, stcb,
 850                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 851                     SCTP_SO_NOT_LOCKED);
 852         }
 853 }
 854
 855
 856 static void
 857 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 858     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 859 {
 860         struct sctp_association *asoc;
 861         int some_on_streamwheel;
 862
 863 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 864         struct socket *so;
 865
 866 #endif
 867
 868         SCTPDBG(SCTP_DEBUG_INPUT2,
 869             "sctp_handle_shutdown: handling SHUTDOWN\n");
 870         if (stcb == NULL)
 871                 return;
 872         asoc = &stcb->asoc;
 873         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 874             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 875                 return;
 876         }
 877         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 878                 /* Shutdown NOT the expected size */
 879                 return;
 880         } else {
 881                 sctp_update_acked(stcb, cp, abort_flag);
 882                 if (*abort_flag) {
 883                         return;
 884                 }
 885         }
 886         if (asoc->control_pdapi) {
 887                 /*
 888                  * With a normal shutdown we assume the end of last record.
 889                  */
 890                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 891                 asoc->control_pdapi->end_added = 1;
 892                 asoc->control_pdapi->pdapi_aborted = 1;
 893                 asoc->control_pdapi = NULL;
 894                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 895 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 896                 so = SCTP_INP_SO(stcb->sctp_ep);
 897                 atomic_add_int(&stcb->asoc.refcnt, 1);
 898                 SCTP_TCB_UNLOCK(stcb);
 899                 SCTP_SOCKET_LOCK(so, 1);
 900                 SCTP_TCB_LOCK(stcb);
 901                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 902                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 903                         /* assoc was freed while we were unlocked */
 904                         SCTP_SOCKET_UNLOCK(so, 1);
 905                         return;
 906                 }
 907 #endif
 908                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 909 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 910                 SCTP_SOCKET_UNLOCK(so, 1);
 911 #endif
 912         }
 913         /* goto SHUTDOWN_RECEIVED state to block new requests */
 914         if (stcb->sctp_socket) {
 915                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 916                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 917                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 918                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 919                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 920                         /*
 921                          * notify upper layer that peer has initiated a
 922                          * shutdown
 923                          */
 924                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 925
 926                         /* reset time */
 927                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 928                 }
 929         }
 930         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 931                 /*
 932                  * stop the shutdown timer, since we WILL move to
 933                  * SHUTDOWN-ACK-SENT.
 934                  */
 935                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 936         }
 937         /* Now is there unsent data on a stream somewhere? */
 938         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 939
 940         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 941             !TAILQ_EMPTY(&asoc->sent_queue) ||
 942             some_on_streamwheel) {
 943                 /* By returning we will push more data out */
 944                 return;
 945         } else {
 946                 /* no outstanding data to send, so move on... */
 947                 /* send SHUTDOWN-ACK */
 948                 /* move to SHUTDOWN-ACK-SENT state */
 949                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 950                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 951                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 952                 }
 953                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 954                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 955                 sctp_stop_timers_for_shutdown(stcb);
 956                 sctp_send_shutdown_ack(stcb, net);
 957                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 958                     stcb, net);
 959         }
 960 }
 961
 962 static void
 963 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 964     struct sctp_tcb *stcb,
 965     struct sctp_nets *net)
 966 {
 967         struct sctp_association *asoc;
 968
 969 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 970         struct socket *so;
 971
 972         so = SCTP_INP_SO(stcb->sctp_ep);
 973 #endif
 974         SCTPDBG(SCTP_DEBUG_INPUT2,
 975             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 976         if (stcb == NULL)
 977                 return;
 978
 979         asoc = &stcb->asoc;
 980         /* process according to association state */
 981         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 982             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 983                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
 984                 sctp_send_shutdown_complete(stcb, net, 1);
 985                 SCTP_TCB_UNLOCK(stcb);
 986                 return;
 987         }
 988         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 989             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 990                 /* unexpected SHUTDOWN-ACK... so ignore... */
 991                 SCTP_TCB_UNLOCK(stcb);
 992                 return;
 993         }
 994         if (asoc->control_pdapi) {
 995                 /*
 996                  * With a normal shutdown we assume the end of last record.
 997                  */
 998                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 999                 asoc->control_pdapi->end_added = 1;
1000                 asoc->control_pdapi->pdapi_aborted = 1;
1001                 asoc->control_pdapi = NULL;
1002                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1003 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1004                 atomic_add_int(&stcb->asoc.refcnt, 1);
1005                 SCTP_TCB_UNLOCK(stcb);
1006                 SCTP_SOCKET_LOCK(so, 1);
1007                 SCTP_TCB_LOCK(stcb);
1008                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1009                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1010                         /* assoc was freed while we were unlocked */
1011                         SCTP_SOCKET_UNLOCK(so, 1);
1012                         return;
1013                 }
1014 #endif
1015                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1016 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1017                 SCTP_SOCKET_UNLOCK(so, 1);
1018 #endif
1019         }
1020 #ifdef INVARIANTS
1021         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1022             !TAILQ_EMPTY(&asoc->sent_queue) ||
1023             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1024                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1025         }
1026 #endif
1027         /* stop the timer */
1028         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1029         /* send SHUTDOWN-COMPLETE */
1030         sctp_send_shutdown_complete(stcb, net, 0);
1031         /* notify upper layer protocol */
1032         if (stcb->sctp_socket) {
1033                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1034                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1035                         stcb->sctp_socket->so_snd.sb_cc = 0;
1036                 }
1037                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1038         }
1039         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1040         /* free the TCB but first save off the ep */
1041 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1042         atomic_add_int(&stcb->asoc.refcnt, 1);
1043         SCTP_TCB_UNLOCK(stcb);
1044         SCTP_SOCKET_LOCK(so, 1);
1045         SCTP_TCB_LOCK(stcb);
1046         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1047 #endif
1048         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1049             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1050 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1051         SCTP_SOCKET_UNLOCK(so, 1);
1052 #endif
1053 }
1054
1055 /*
1056  * Skip past the param header and then we will find the chunk that caused the
1057  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1058  * our peer must be broken.
1059  */
1060 static void
1061 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1062     struct sctp_nets *net)
1063 {
1064         struct sctp_chunkhdr *chk;
1065
1066         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1067         switch (chk->chunk_type) {
1068         case SCTP_ASCONF_ACK:
1069         case SCTP_ASCONF:
1070                 sctp_asconf_cleanup(stcb, net);
1071                 break;
1072         case SCTP_FORWARD_CUM_TSN:
1073                 stcb->asoc.prsctp_supported = 0;
1074                 break;
1075         default:
1076                 SCTPDBG(SCTP_DEBUG_INPUT2,
1077                     "Peer does not support chunk type %d(%x)??\n",
1078                     chk->chunk_type, (uint32_t) chk->chunk_type);
1079                 break;
1080         }
1081 }
1082
1083 /*
1084  * Skip past the param header and then we will find the param that caused the
1085  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1086  * these will turn of specific features.
1087  * XXX: Is this the right thing to do?
1088  */
1089 static void
1090 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1091 {
1092         struct sctp_paramhdr *pbad;
1093
1094         pbad = phdr + 1;
1095         switch (ntohs(pbad->param_type)) {
1096                 /* pr-sctp draft */
1097         case SCTP_PRSCTP_SUPPORTED:
1098                 stcb->asoc.prsctp_supported = 0;
1099                 break;
1100         case SCTP_SUPPORTED_CHUNK_EXT:
1101                 break;
1102                 /* draft-ietf-tsvwg-addip-sctp */
1103         case SCTP_HAS_NAT_SUPPORT:
1104                 stcb->asoc.peer_supports_nat = 0;
1105                 break;
1106         case SCTP_ADD_IP_ADDRESS:
1107         case SCTP_DEL_IP_ADDRESS:
1108         case SCTP_SET_PRIM_ADDR:
1109                 stcb->asoc.asconf_supported = 0;
1110                 break;
1111         case SCTP_SUCCESS_REPORT:
1112         case SCTP_ERROR_CAUSE_IND:
1113                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1114                 SCTPDBG(SCTP_DEBUG_INPUT2,
1115                     "Turning off ASCONF to this strange peer\n");
1116                 stcb->asoc.asconf_supported = 0;
1117                 break;
1118         default:
1119                 SCTPDBG(SCTP_DEBUG_INPUT2,
1120                     "Peer does not support param type %d(%x)??\n",
1121                     pbad->param_type, (uint32_t) pbad->param_type);
1122                 break;
1123         }
1124 }
1125
1126 static int
1127 sctp_handle_error(struct sctp_chunkhdr *ch,
1128     struct sctp_tcb *stcb, struct sctp_nets *net)
1129 {
1130         int chklen;
1131         struct sctp_paramhdr *phdr;
1132         uint16_t error, error_type;
1133         uint16_t error_len;
1134         struct sctp_association *asoc;
1135         int adjust;
1136
1137 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1138         struct socket *so;
1139
1140 #endif
1141
1142         /* parse through all of the errors and process */
1143         asoc = &stcb->asoc;
1144         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1145             sizeof(struct sctp_chunkhdr));
1146         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1147         error = 0;
1148         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1149                 /* Process an Error Cause */
1150                 error_type = ntohs(phdr->param_type);
1151                 error_len = ntohs(phdr->param_length);
1152                 if ((error_len > chklen) || (error_len == 0)) {
1153                         /* invalid param length for this param */
1154                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1155                             chklen, error_len);
1156                         return (0);
1157                 }
1158                 if (error == 0) {
1159                         /* report the first error cause */
1160                         error = error_type;
1161                 }
1162                 switch (error_type) {
1163                 case SCTP_CAUSE_INVALID_STREAM:
1164                 case SCTP_CAUSE_MISSING_PARAM:
1165                 case SCTP_CAUSE_INVALID_PARAM:
1166                 case SCTP_CAUSE_NO_USER_DATA:
1167                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1168                             error_type);
1169                         break;
1170                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1171                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1172                             ch->chunk_flags);
1173                         if (sctp_handle_nat_colliding_state(stcb)) {
1174                                 return (0);
1175                         }
1176                         break;
1177                 case SCTP_CAUSE_NAT_MISSING_STATE:
1178                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1179                             ch->chunk_flags);
1180                         if (sctp_handle_nat_missing_state(stcb, net)) {
1181                                 return (0);
1182                         }
1183                         break;
1184                 case SCTP_CAUSE_STALE_COOKIE:
1185                         /*
1186                          * We only act if we have echoed a cookie and are
1187                          * waiting.
1188                          */
1189                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1190                                 int *p;
1191
1192                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1193                                 /* Save the time doubled */
1194                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1195                                 asoc->stale_cookie_count++;
1196                                 if (asoc->stale_cookie_count >
1197                                     asoc->max_init_times) {
1198                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1199                                         /* now free the asoc */
1200 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1201                                         so = SCTP_INP_SO(stcb->sctp_ep);
1202                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1203                                         SCTP_TCB_UNLOCK(stcb);
1204                                         SCTP_SOCKET_LOCK(so, 1);
1205                                         SCTP_TCB_LOCK(stcb);
1206                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1207 #endif
1208                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1209                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1210 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1211                                         SCTP_SOCKET_UNLOCK(so, 1);
1212 #endif
1213                                         return (-1);
1214                                 }
1215                                 /* blast back to INIT state */
1216                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1217                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1218                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1219                                 sctp_stop_all_cookie_timers(stcb);
1220                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1221                         }
1222                         break;
1223                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1224                         /*
1225                          * Nothing we can do here, we don't do hostname
1226                          * addresses so if the peer does not like my IPv6
1227                          * (or IPv4 for that matter) it does not matter. If
1228                          * they don't support that type of address, they can
1229                          * NOT possibly get that packet type... i.e. with no
1230                          * IPv6 you can't recieve a IPv6 packet. so we can
1231                          * safely ignore this one. If we ever added support
1232                          * for HOSTNAME Addresses, then we would need to do
1233                          * something here.
1234                          */
1235                         break;
1236                 case SCTP_CAUSE_UNRECOG_CHUNK:
1237                         sctp_process_unrecog_chunk(stcb, phdr, net);
1238                         break;
1239                 case SCTP_CAUSE_UNRECOG_PARAM:
1240                         sctp_process_unrecog_param(stcb, phdr);
1241                         break;
1242                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1243                         /*
1244                          * We ignore this since the timer will drive out a
1245                          * new cookie anyway and there timer will drive us
1246                          * to send a SHUTDOWN_COMPLETE. We can't send one
1247                          * here since we don't have their tag.
1248                          */
1249                         break;
1250                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1251                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1252                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1253                         /*
1254                          * We should NOT get these here, but in a
1255                          * ASCONF-ACK.
1256                          */
1257                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1258                             error_type);
1259                         break;
1260                 case SCTP_CAUSE_OUT_OF_RESC:
1261                         /*
1262                          * And what, pray tell do we do with the fact that
1263                          * the peer is out of resources? Not really sure we
1264                          * could do anything but abort. I suspect this
1265                          * should have came WITH an abort instead of in a
1266                          * OP-ERROR.
1267                          */
1268                         break;
1269                 default:
1270                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1271                             error_type);
1272                         break;
1273                 }
1274                 adjust = SCTP_SIZE32(error_len);
1275                 chklen -= adjust;
1276                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1277         }
1278         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1279         return (0);
1280 }
1281
1282 static int
1283 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1284     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1285     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1286     struct sctp_nets *net, int *abort_no_unlock,
1287     uint8_t mflowtype, uint32_t mflowid,
1288     uint32_t vrf_id)
1289 {
1290         struct sctp_init_ack *init_ack;
1291         struct mbuf *op_err;
1292
1293         SCTPDBG(SCTP_DEBUG_INPUT2,
1294             "sctp_handle_init_ack: handling INIT-ACK\n");
1295
1296         if (stcb == NULL) {
1297                 SCTPDBG(SCTP_DEBUG_INPUT2,
1298                     "sctp_handle_init_ack: TCB is null\n");
1299                 return (-1);
1300         }
1301         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1302                 /* Invalid length */
1303                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1304                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1305                     src, dst, sh, op_err,
1306                     mflowtype, mflowid,
1307                     vrf_id, net->port);
1308                 *abort_no_unlock = 1;
1309                 return (-1);
1310         }
1311         init_ack = &cp->init;
1312         /* validate parameters */
1313         if (init_ack->initiate_tag == 0) {
1314                 /* protocol error... send an abort */
1315                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1316                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1317                     src, dst, sh, op_err,
1318                     mflowtype, mflowid,
1319                     vrf_id, net->port);
1320                 *abort_no_unlock = 1;
1321                 return (-1);
1322         }
1323         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1324                 /* protocol error... send an abort */
1325                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1326                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1327                     src, dst, sh, op_err,
1328                     mflowtype, mflowid,
1329                     vrf_id, net->port);
1330                 *abort_no_unlock = 1;
1331                 return (-1);
1332         }
1333         if (init_ack->num_inbound_streams == 0) {
1334                 /* protocol error... send an abort */
1335                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1336                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1337                     src, dst, sh, op_err,
1338                     mflowtype, mflowid,
1339                     vrf_id, net->port);
1340                 *abort_no_unlock = 1;
1341                 return (-1);
1342         }
1343         if (init_ack->num_outbound_streams == 0) {
1344                 /* protocol error... send an abort */
1345                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1346                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1347                     src, dst, sh, op_err,
1348                     mflowtype, mflowid,
1349                     vrf_id, net->port);
1350                 *abort_no_unlock = 1;
1351                 return (-1);
1352         }
1353         /* process according to association state... */
1354         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1355         case SCTP_STATE_COOKIE_WAIT:
1356                 /* this is the expected state for this chunk */
1357                 /* process the INIT-ACK parameters */
1358                 if (stcb->asoc.primary_destination->dest_state &
1359                     SCTP_ADDR_UNCONFIRMED) {
1360                         /*
1361                          * The primary is where we sent the INIT, we can
1362                          * always consider it confirmed when the INIT-ACK is
1363                          * returned. Do this before we load addresses
1364                          * though.
1365                          */
1366                         stcb->asoc.primary_destination->dest_state &=
1367                             ~SCTP_ADDR_UNCONFIRMED;
1368                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1369                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1370                 }
1371                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1372                     net, abort_no_unlock,
1373                     mflowtype, mflowid,
1374                     vrf_id) < 0) {
1375                         /* error in parsing parameters */
1376                         return (-1);
1377                 }
1378                 /* update our state */
1379                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1380                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1381
1382                 /* reset the RTO calc */
1383                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1384                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1385                             stcb->asoc.overall_error_count,
1386                             0,
1387                             SCTP_FROM_SCTP_INPUT,
1388                             __LINE__);
1389                 }
1390                 stcb->asoc.overall_error_count = 0;
1391                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1392                 /*
1393                  * collapse the init timer back in case of a exponential
1394                  * backoff
1395                  */
1396                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1397                     stcb, net);
1398                 /*
1399                  * the send at the end of the inbound data processing will
1400                  * cause the cookie to be sent
1401                  */
1402                 break;
1403         case SCTP_STATE_SHUTDOWN_SENT:
1404                 /* incorrect state... discard */
1405                 break;
1406         case SCTP_STATE_COOKIE_ECHOED:
1407                 /* incorrect state... discard */
1408                 break;
1409         case SCTP_STATE_OPEN:
1410                 /* incorrect state... discard */
1411                 break;
1412         case SCTP_STATE_EMPTY:
1413         case SCTP_STATE_INUSE:
1414         default:
1415                 /* incorrect state... discard */
1416                 return (-1);
1417                 break;
1418         }
1419         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1420         return (0);
1421 }
1422
1423 static struct sctp_tcb *
1424 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1425     struct sockaddr *src, struct sockaddr *dst,
1426     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1427     struct sctp_inpcb *inp, struct sctp_nets **netp,
1428     struct sockaddr *init_src, int *notification,
1429     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1430     uint8_t mflowtype, uint32_t mflowid,
1431     uint32_t vrf_id, uint16_t port);
1432
1433
1434 /*
1435  * handle a state cookie for an existing association m: input packet mbuf
1436  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1437  * "split" mbuf and the cookie signature does not exist offset: offset into
1438  * mbuf to the cookie-echo chunk
1439  */
1440 static struct sctp_tcb *
1441 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1442     struct sockaddr *src, struct sockaddr *dst,
1443     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1444     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1445     struct sockaddr *init_src, int *notification,
1446     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1447     uint8_t mflowtype, uint32_t mflowid,
1448     uint32_t vrf_id, uint16_t port)
1449 {
1450         struct sctp_association *asoc;
1451         struct sctp_init_chunk *init_cp, init_buf;
1452         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1453         struct sctp_nets *net;
1454         struct mbuf *op_err;
1455         int init_offset, initack_offset, i;
1456         int retval;
1457         int spec_flag = 0;
1458         uint32_t how_indx;
1459
1460 #if defined(SCTP_DETAILED_STR_STATS)
1461         int j;
1462
1463 #endif
1464
1465         net = *netp;
1466         /* I know that the TCB is non-NULL from the caller */
1467         asoc = &stcb->asoc;
1468         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1469                 if (asoc->cookie_how[how_indx] == 0)
1470                         break;
1471         }
1472         if (how_indx < sizeof(asoc->cookie_how)) {
1473                 asoc->cookie_how[how_indx] = 1;
1474         }
1475         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1476                 /* SHUTDOWN came in after sending INIT-ACK */
1477                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1478                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1479                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1480                     mflowtype, mflowid,
1481                     vrf_id, net->port);
1482                 if (how_indx < sizeof(asoc->cookie_how))
1483                         asoc->cookie_how[how_indx] = 2;
1484                 return (NULL);
1485         }
1486         /*
1487          * find and validate the INIT chunk in the cookie (peer's info) the
1488          * INIT should start after the cookie-echo header struct (chunk
1489          * header, state cookie header struct)
1490          */
1491         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1492
1493         init_cp = (struct sctp_init_chunk *)
1494             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1495             (uint8_t *) & init_buf);
1496         if (init_cp == NULL) {
1497                 /* could not pull a INIT chunk in cookie */
1498                 return (NULL);
1499         }
1500         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1501                 return (NULL);
1502         }
1503         /*
1504          * find and validate the INIT-ACK chunk in the cookie (my info) the
1505          * INIT-ACK follows the INIT chunk
1506          */
1507         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1508         initack_cp = (struct sctp_init_ack_chunk *)
1509             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1510             (uint8_t *) & initack_buf);
1511         if (initack_cp == NULL) {
1512                 /* could not pull INIT-ACK chunk in cookie */
1513                 return (NULL);
1514         }
1515         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1516                 return (NULL);
1517         }
1518         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1519             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1520                 /*
1521                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1522                  * to get into the OPEN state
1523                  */
1524                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1525                         /*-
1526                          * Opps, this means that we somehow generated two vtag's
1527                          * the same. I.e. we did:
1528                          *  Us               Peer
1529                          *   <---INIT(tag=a)------
1530                          *   ----INIT-ACK(tag=t)-->
1531                          *   ----INIT(tag=t)------> *1
1532                          *   <---INIT-ACK(tag=a)---
1533                          *   <----CE(tag=t)------------- *2
1534                          *
1535                          * At point *1 we should be generating a different
1536                          * tag t'. Which means we would throw away the CE and send
1537                          * ours instead. Basically this is case C (throw away side).
1538                          */
1539                         if (how_indx < sizeof(asoc->cookie_how))
1540                                 asoc->cookie_how[how_indx] = 17;
1541                         return (NULL);
1542
1543                 }
1544                 switch (SCTP_GET_STATE(asoc)) {
1545                 case SCTP_STATE_COOKIE_WAIT:
1546                 case SCTP_STATE_COOKIE_ECHOED:
1547                         /*
1548                          * INIT was sent but got a COOKIE_ECHO with the
1549                          * correct tags... just accept it...but we must
1550                          * process the init so that we can make sure we have
1551                          * the right seq no's.
1552                          */
1553                         /* First we must process the INIT !! */
1554                         retval = sctp_process_init(init_cp, stcb);
1555                         if (retval < 0) {
1556                                 if (how_indx < sizeof(asoc->cookie_how))
1557                                         asoc->cookie_how[how_indx] = 3;
1558                                 return (NULL);
1559                         }
1560                         /* we have already processed the INIT so no problem */
1561                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1562                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1563                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1564                         /* update current state */
1565                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1566                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1567                         else
1568                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1569
1570                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1571                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1572                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1573                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1574                         }
1575                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1576                         sctp_stop_all_cookie_timers(stcb);
1577                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1578                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1579                             (inp->sctp_socket->so_qlimit == 0)
1580                             ) {
1581 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1582                                 struct socket *so;
1583
1584 #endif
1585                                 /*
1586                                  * Here is where collision would go if we
1587                                  * did a connect() and instead got a
1588                                  * init/init-ack/cookie done before the
1589                                  * init-ack came back..
1590                                  */
1591                                 stcb->sctp_ep->sctp_flags |=
1592                                     SCTP_PCB_FLAGS_CONNECTED;
1593 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1594                                 so = SCTP_INP_SO(stcb->sctp_ep);
1595                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1596                                 SCTP_TCB_UNLOCK(stcb);
1597                                 SCTP_SOCKET_LOCK(so, 1);
1598                                 SCTP_TCB_LOCK(stcb);
1599                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1600                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1601                                         SCTP_SOCKET_UNLOCK(so, 1);
1602                                         return (NULL);
1603                                 }
1604 #endif
1605                                 soisconnected(stcb->sctp_socket);
1606 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1607                                 SCTP_SOCKET_UNLOCK(so, 1);
1608 #endif
1609                         }
1610                         /* notify upper layer */
1611                         *notification = SCTP_NOTIFY_ASSOC_UP;
1612                         /*
1613                          * since we did not send a HB make sure we don't
1614                          * double things
1615                          */
1616                         net->hb_responded = 1;
1617                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1618                             &cookie->time_entered,
1619                             sctp_align_unsafe_makecopy,
1620                             SCTP_RTT_FROM_NON_DATA);
1621
1622                         if (stcb->asoc.sctp_autoclose_ticks &&
1623                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1624                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1625                                     inp, stcb, NULL);
1626                         }
1627                         break;
1628                 default:
1629                         /*
1630                          * we're in the OPEN state (or beyond), so peer must
1631                          * have simply lost the COOKIE-ACK
1632                          */
1633                         break;
1634                 }               /* end switch */
1635                 sctp_stop_all_cookie_timers(stcb);
1636                 /*
1637                  * We ignore the return code here.. not sure if we should
1638                  * somehow abort.. but we do have an existing asoc. This
1639                  * really should not fail.
1640                  */
1641                 if (sctp_load_addresses_from_init(stcb, m,
1642                     init_offset + sizeof(struct sctp_init_chunk),
1643                     initack_offset, src, dst, init_src)) {
1644                         if (how_indx < sizeof(asoc->cookie_how))
1645                                 asoc->cookie_how[how_indx] = 4;
1646                         return (NULL);
1647                 }
1648                 /* respond with a COOKIE-ACK */
1649                 sctp_toss_old_cookies(stcb, asoc);
1650                 sctp_send_cookie_ack(stcb);
1651                 if (how_indx < sizeof(asoc->cookie_how))
1652                         asoc->cookie_how[how_indx] = 5;
1653                 return (stcb);
1654         }
1655         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1656             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1657             cookie->tie_tag_my_vtag == 0 &&
1658             cookie->tie_tag_peer_vtag == 0) {
1659                 /*
1660                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1661                  */
1662                 if (how_indx < sizeof(asoc->cookie_how))
1663                         asoc->cookie_how[how_indx] = 6;
1664                 return (NULL);
1665         }
1666         /*
1667          * If nat support, and the below and stcb is established, send back
1668          * a ABORT(colliding state) if we are established.
1669          */
1670         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1671             (asoc->peer_supports_nat) &&
1672             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1673             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1674             (asoc->peer_vtag == 0)))) {
1675                 /*
1676                  * Special case - Peer's support nat. We may have two init's
1677                  * that we gave out the same tag on since one was not
1678                  * established.. i.e. we get INIT from host-1 behind the nat
1679                  * and we respond tag-a, we get a INIT from host-2 behind
1680                  * the nat and we get tag-a again. Then we bring up host-1
1681                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1682                  * Now we have colliding state. We must send an abort here
1683                  * with colliding state indication.
1684                  */
1685                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1686                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1687                     mflowtype, mflowid,
1688                     vrf_id, port);
1689                 return (NULL);
1690         }
1691         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1692             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1693             (asoc->peer_vtag == 0))) {
1694                 /*
1695                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1696                  * should be ok, re-accept peer info
1697                  */
1698                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1699                         /*
1700                          * Extension of case C. If we hit this, then the
1701                          * random number generator returned the same vtag
1702                          * when we first sent our INIT-ACK and when we later
1703                          * sent our INIT. The side with the seq numbers that
1704                          * are different will be the one that normnally
1705                          * would have hit case C. This in effect "extends"
1706                          * our vtags in this collision case to be 64 bits.
1707                          * The same collision could occur aka you get both
1708                          * vtag and seq number the same twice in a row.. but
1709                          * is much less likely. If it did happen then we
1710                          * would proceed through and bring up the assoc.. we
1711                          * may end up with the wrong stream setup however..
1712                          * which would be bad.. but there is no way to
1713                          * tell.. until we send on a stream that does not
1714                          * exist :-)
1715                          */
1716                         if (how_indx < sizeof(asoc->cookie_how))
1717                                 asoc->cookie_how[how_indx] = 7;
1718
1719                         return (NULL);
1720                 }
1721                 if (how_indx < sizeof(asoc->cookie_how))
1722                         asoc->cookie_how[how_indx] = 8;
1723                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1724                 sctp_stop_all_cookie_timers(stcb);
1725                 /*
1726                  * since we did not send a HB make sure we don't double
1727                  * things
1728                  */
1729                 net->hb_responded = 1;
1730                 if (stcb->asoc.sctp_autoclose_ticks &&
1731                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1732                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1733                             NULL);
1734                 }
1735                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1736                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1737
1738                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1739                         /*
1740                          * Ok the peer probably discarded our data (if we
1741                          * echoed a cookie+data). So anything on the
1742                          * sent_queue should be marked for retransmit, we
1743                          * may not get something to kick us so it COULD
1744                          * still take a timeout to move these.. but it can't
1745                          * hurt to mark them.
1746                          */
1747                         struct sctp_tmit_chunk *chk;
1748
1749                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1750                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1751                                         chk->sent = SCTP_DATAGRAM_RESEND;
1752                                         sctp_flight_size_decrease(chk);
1753                                         sctp_total_flight_decrease(stcb, chk);
1754                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1755                                         spec_flag++;
1756                                 }
1757                         }
1758
1759                 }
1760                 /* process the INIT info (peer's info) */
1761                 retval = sctp_process_init(init_cp, stcb);
1762                 if (retval < 0) {
1763                         if (how_indx < sizeof(asoc->cookie_how))
1764                                 asoc->cookie_how[how_indx] = 9;
1765                         return (NULL);
1766                 }
1767                 if (sctp_load_addresses_from_init(stcb, m,
1768                     init_offset + sizeof(struct sctp_init_chunk),
1769                     initack_offset, src, dst, init_src)) {
1770                         if (how_indx < sizeof(asoc->cookie_how))
1771                                 asoc->cookie_how[how_indx] = 10;
1772                         return (NULL);
1773                 }
1774                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1775                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1776                         *notification = SCTP_NOTIFY_ASSOC_UP;
1777
1778                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1779                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1780                             (inp->sctp_socket->so_qlimit == 0)) {
1781 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1782                                 struct socket *so;
1783
1784 #endif
1785                                 stcb->sctp_ep->sctp_flags |=
1786                                     SCTP_PCB_FLAGS_CONNECTED;
1787 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1788                                 so = SCTP_INP_SO(stcb->sctp_ep);
1789                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1790                                 SCTP_TCB_UNLOCK(stcb);
1791                                 SCTP_SOCKET_LOCK(so, 1);
1792                                 SCTP_TCB_LOCK(stcb);
1793                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1794                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1795                                         SCTP_SOCKET_UNLOCK(so, 1);
1796                                         return (NULL);
1797                                 }
1798 #endif
1799                                 soisconnected(stcb->sctp_socket);
1800 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1801                                 SCTP_SOCKET_UNLOCK(so, 1);
1802 #endif
1803                         }
1804                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1805                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1806                         else
1807                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1808                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1809                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1810                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1811                 } else {
1812                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1813                 }
1814                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1815                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1816                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1817                             stcb->sctp_ep, stcb, asoc->primary_destination);
1818                 }
1819                 sctp_stop_all_cookie_timers(stcb);
1820                 sctp_toss_old_cookies(stcb, asoc);
1821                 sctp_send_cookie_ack(stcb);
1822                 if (spec_flag) {
1823                         /*
1824                          * only if we have retrans set do we do this. What
1825                          * this call does is get only the COOKIE-ACK out and
1826                          * then when we return the normal call to
1827                          * sctp_chunk_output will get the retrans out behind
1828                          * this.
1829                          */
1830                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1831                 }
1832                 if (how_indx < sizeof(asoc->cookie_how))
1833                         asoc->cookie_how[how_indx] = 11;
1834
1835                 return (stcb);
1836         }
1837         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1838             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1839             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1840             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1841             cookie->tie_tag_peer_vtag != 0) {
1842                 struct sctpasochead *head;
1843
1844 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1845                 struct socket *so;
1846
1847 #endif
1848
1849                 if (asoc->peer_supports_nat) {
1850                         /*
1851                          * This is a gross gross hack. Just call the
1852                          * cookie_new code since we are allowing a duplicate
1853                          * association. I hope this works...
1854                          */
1855                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1856                             sh, cookie, cookie_len,
1857                             inp, netp, init_src, notification,
1858                             auth_skipped, auth_offset, auth_len,
1859                             mflowtype, mflowid,
1860                             vrf_id, port));
1861                 }
1862                 /*
1863                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1864                  */
1865                 /* temp code */
1866                 if (how_indx < sizeof(asoc->cookie_how))
1867                         asoc->cookie_how[how_indx] = 12;
1868                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1869                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1870
1871                 /* notify upper layer */
1872                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1873                 atomic_add_int(&stcb->asoc.refcnt, 1);
1874                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1875                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1876                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1877                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1878                 }
1879                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1880                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1881                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1882                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1883                 }
1884                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1885                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1886                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1887                             stcb->sctp_ep, stcb, asoc->primary_destination);
1888
1889                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1890                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1891                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1892                 }
1893                 asoc->pre_open_streams =
1894                     ntohs(initack_cp->init.num_outbound_streams);
1895                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1896                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1897                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1898
1899                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1900
1901                 asoc->str_reset_seq_in = asoc->init_seq_number;
1902
1903                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1904                 if (asoc->mapping_array) {
1905                         memset(asoc->mapping_array, 0,
1906                             asoc->mapping_array_size);
1907                 }
1908                 if (asoc->nr_mapping_array) {
1909                         memset(asoc->nr_mapping_array, 0,
1910                             asoc->mapping_array_size);
1911                 }
1912                 SCTP_TCB_UNLOCK(stcb);
1913 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1914                 so = SCTP_INP_SO(stcb->sctp_ep);
1915                 SCTP_SOCKET_LOCK(so, 1);
1916 #endif
1917                 SCTP_INP_INFO_WLOCK();
1918                 SCTP_INP_WLOCK(stcb->sctp_ep);
1919                 SCTP_TCB_LOCK(stcb);
1920                 atomic_add_int(&stcb->asoc.refcnt, -1);
1921                 /* send up all the data */
1922                 SCTP_TCB_SEND_LOCK(stcb);
1923
1924                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1925                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1926                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1927 #if defined(SCTP_DETAILED_STR_STATS)
1928                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1929                                 asoc->strmout[i].abandoned_sent[j] = 0;
1930                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1931                         }
1932 #else
1933                         asoc->strmout[i].abandoned_sent[0] = 0;
1934                         asoc->strmout[i].abandoned_unsent[0] = 0;
1935 #endif
1936                         stcb->asoc.strmout[i].stream_no = i;
1937                         stcb->asoc.strmout[i].next_sequence_send = 0;
1938                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1939                 }
1940                 /* process the INIT-ACK info (my info) */
1941                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1942                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1943
1944                 /* pull from vtag hash */
1945                 LIST_REMOVE(stcb, sctp_asocs);
1946                 /* re-insert to new vtag position */
1947                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1948                     SCTP_BASE_INFO(hashasocmark))];
1949                 /*
1950                  * put it in the bucket in the vtag hash of assoc's for the
1951                  * system
1952                  */
1953                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1954
1955                 SCTP_TCB_SEND_UNLOCK(stcb);
1956                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
1957                 SCTP_INP_INFO_WUNLOCK();
1958 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1959                 SCTP_SOCKET_UNLOCK(so, 1);
1960 #endif
1961                 asoc->total_flight = 0;
1962                 asoc->total_flight_count = 0;
1963                 /* process the INIT info (peer's info) */
1964                 retval = sctp_process_init(init_cp, stcb);
1965                 if (retval < 0) {
1966                         if (how_indx < sizeof(asoc->cookie_how))
1967                                 asoc->cookie_how[how_indx] = 13;
1968
1969                         return (NULL);
1970                 }
1971                 /*
1972                  * since we did not send a HB make sure we don't double
1973                  * things
1974                  */
1975                 net->hb_responded = 1;
1976
1977                 if (sctp_load_addresses_from_init(stcb, m,
1978                     init_offset + sizeof(struct sctp_init_chunk),
1979                     initack_offset, src, dst, init_src)) {
1980                         if (how_indx < sizeof(asoc->cookie_how))
1981                                 asoc->cookie_how[how_indx] = 14;
1982
1983                         return (NULL);
1984                 }
1985                 /* respond with a COOKIE-ACK */
1986                 sctp_stop_all_cookie_timers(stcb);
1987                 sctp_toss_old_cookies(stcb, asoc);
1988                 sctp_send_cookie_ack(stcb);
1989                 if (how_indx < sizeof(asoc->cookie_how))
1990                         asoc->cookie_how[how_indx] = 15;
1991
1992                 return (stcb);
1993         }
1994         if (how_indx < sizeof(asoc->cookie_how))
1995                 asoc->cookie_how[how_indx] = 16;
1996         /* all other cases... */
1997         return (NULL);
1998 }
1999
2000
2001 /*
2002  * handle a state cookie for a new association m: input packet mbuf chain--
2003  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2004  * and the cookie signature does not exist offset: offset into mbuf to the
2005  * cookie-echo chunk length: length of the cookie chunk to: where the init
2006  * was from returns a new TCB
2007  */
2008 static struct sctp_tcb *
2009 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2010     struct sockaddr *src, struct sockaddr *dst,
2011     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2012     struct sctp_inpcb *inp, struct sctp_nets **netp,
2013     struct sockaddr *init_src, int *notification,
2014     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2015     uint8_t mflowtype, uint32_t mflowid,
2016     uint32_t vrf_id, uint16_t port)
2017 {
2018         struct sctp_tcb *stcb;
2019         struct sctp_init_chunk *init_cp, init_buf;
2020         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2021         union sctp_sockstore store;
2022         struct sctp_association *asoc;
2023         int init_offset, initack_offset, initack_limit;
2024         int retval;
2025         int error = 0;
2026         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2027
2028 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2029         struct socket *so;
2030
2031         so = SCTP_INP_SO(inp);
2032 #endif
2033
2034         /*
2035          * find and validate the INIT chunk in the cookie (peer's info) the
2036          * INIT should start after the cookie-echo header struct (chunk
2037          * header, state cookie header struct)
2038          */
2039         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2040         init_cp = (struct sctp_init_chunk *)
2041             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2042             (uint8_t *) & init_buf);
2043         if (init_cp == NULL) {
2044                 /* could not pull a INIT chunk in cookie */
2045                 SCTPDBG(SCTP_DEBUG_INPUT1,
2046                     "process_cookie_new: could not pull INIT chunk hdr\n");
2047                 return (NULL);
2048         }
2049         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2050                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2051                 return (NULL);
2052         }
2053         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2054         /*
2055          * find and validate the INIT-ACK chunk in the cookie (my info) the
2056          * INIT-ACK follows the INIT chunk
2057          */
2058         initack_cp = (struct sctp_init_ack_chunk *)
2059             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2060             (uint8_t *) & initack_buf);
2061         if (initack_cp == NULL) {
2062                 /* could not pull INIT-ACK chunk in cookie */
2063                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2064                 return (NULL);
2065         }
2066         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2067                 return (NULL);
2068         }
2069         /*
2070          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2071          * "initack_limit" value.  This is because the chk_length field
2072          * includes the length of the cookie, but the cookie is omitted when
2073          * the INIT and INIT_ACK are tacked onto the cookie...
2074          */
2075         initack_limit = offset + cookie_len;
2076
2077         /*
2078          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2079          * and popluate
2080          */
2081
2082         /*
2083          * Here we do a trick, we set in NULL for the proc/thread argument.
2084          * We do this since in effect we only use the p argument when the
2085          * socket is unbound and we must do an implicit bind. Since we are
2086          * getting a cookie, we cannot be unbound.
2087          */
2088         stcb = sctp_aloc_assoc(inp, init_src, &error,
2089             ntohl(initack_cp->init.initiate_tag), vrf_id,
2090             (struct thread *)NULL
2091             );
2092         if (stcb == NULL) {
2093                 struct mbuf *op_err;
2094
2095                 /* memory problem? */
2096                 SCTPDBG(SCTP_DEBUG_INPUT1,
2097                     "process_cookie_new: no room for another TCB!\n");
2098                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2099                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2100                     src, dst, sh, op_err,
2101                     mflowtype, mflowid,
2102                     vrf_id, port);
2103                 return (NULL);
2104         }
2105         /* get the correct sctp_nets */
2106         if (netp)
2107                 *netp = sctp_findnet(stcb, init_src);
2108
2109         asoc = &stcb->asoc;
2110         /* get scope variables out of cookie */
2111         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2112         asoc->scope.site_scope = cookie->site_scope;
2113         asoc->scope.local_scope = cookie->local_scope;
2114         asoc->scope.loopback_scope = cookie->loopback_scope;
2115
2116         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2117             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2118                 struct mbuf *op_err;
2119
2120                 /*
2121                  * Houston we have a problem. The EP changed while the
2122                  * cookie was in flight. Only recourse is to abort the
2123                  * association.
2124                  */
2125                 atomic_add_int(&stcb->asoc.refcnt, 1);
2126                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2127                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2128                     src, dst, sh, op_err,
2129                     mflowtype, mflowid,
2130                     vrf_id, port);
2131 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2132                 SCTP_TCB_UNLOCK(stcb);
2133                 SCTP_SOCKET_LOCK(so, 1);
2134                 SCTP_TCB_LOCK(stcb);
2135 #endif
2136                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2137                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2138 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2139                 SCTP_SOCKET_UNLOCK(so, 1);
2140 #endif
2141                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2142                 return (NULL);
2143         }
2144         /* process the INIT-ACK info (my info) */
2145         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2146         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2147         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2148         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2149         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2150         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2151         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2152         asoc->str_reset_seq_in = asoc->init_seq_number;
2153
2154         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2155
2156         /* process the INIT info (peer's info) */
2157         if (netp)
2158                 retval = sctp_process_init(init_cp, stcb);
2159         else
2160                 retval = 0;
2161         if (retval < 0) {
2162                 atomic_add_int(&stcb->asoc.refcnt, 1);
2163 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2164                 SCTP_TCB_UNLOCK(stcb);
2165                 SCTP_SOCKET_LOCK(so, 1);
2166                 SCTP_TCB_LOCK(stcb);
2167 #endif
2168                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2169 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2170                 SCTP_SOCKET_UNLOCK(so, 1);
2171 #endif
2172                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2173                 return (NULL);
2174         }
2175         /* load all addresses */
2176         if (sctp_load_addresses_from_init(stcb, m,
2177             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2178             src, dst, init_src)) {
2179                 atomic_add_int(&stcb->asoc.refcnt, 1);
2180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2181                 SCTP_TCB_UNLOCK(stcb);
2182                 SCTP_SOCKET_LOCK(so, 1);
2183                 SCTP_TCB_LOCK(stcb);
2184 #endif
2185                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2186 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2187                 SCTP_SOCKET_UNLOCK(so, 1);
2188 #endif
2189                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2190                 return (NULL);
2191         }
2192         /*
2193          * verify any preceding AUTH chunk that was skipped
2194          */
2195         /* pull the local authentication parameters from the cookie/init-ack */
2196         sctp_auth_get_cookie_params(stcb, m,
2197             initack_offset + sizeof(struct sctp_init_ack_chunk),
2198             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2199         if (auth_skipped) {
2200                 struct sctp_auth_chunk *auth;
2201
2202                 auth = (struct sctp_auth_chunk *)
2203                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2204                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2205                         /* auth HMAC failed, dump the assoc and packet */
2206                         SCTPDBG(SCTP_DEBUG_AUTH1,
2207                             "COOKIE-ECHO: AUTH failed\n");
2208                         atomic_add_int(&stcb->asoc.refcnt, 1);
2209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2210                         SCTP_TCB_UNLOCK(stcb);
2211                         SCTP_SOCKET_LOCK(so, 1);
2212                         SCTP_TCB_LOCK(stcb);
2213 #endif
2214                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2215 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2216                         SCTP_SOCKET_UNLOCK(so, 1);
2217 #endif
2218                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2219                         return (NULL);
2220                 } else {
2221                         /* remaining chunks checked... good to go */
2222                         stcb->asoc.authenticated = 1;
2223                 }
2224         }
2225         /* update current state */
2226         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2227         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2228         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2229                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2230                     stcb->sctp_ep, stcb, asoc->primary_destination);
2231         }
2232         sctp_stop_all_cookie_timers(stcb);
2233         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2234         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2235
2236         /*
2237          * if we're doing ASCONFs, check to see if we have any new local
2238          * addresses that need to get added to the peer (eg. addresses
2239          * changed while cookie echo in flight).  This needs to be done
2240          * after we go to the OPEN state to do the correct asconf
2241          * processing. else, make sure we have the correct addresses in our
2242          * lists
2243          */
2244
2245         /* warning, we re-use sin, sin6, sa_store here! */
2246         /* pull in local_address (our "from" address) */
2247         switch (cookie->laddr_type) {
2248 #ifdef INET
2249         case SCTP_IPV4_ADDRESS:
2250                 /* source addr is IPv4 */
2251                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2252                 store.sin.sin_family = AF_INET;
2253                 store.sin.sin_len = sizeof(struct sockaddr_in);
2254                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2255                 break;
2256 #endif
2257 #ifdef INET6
2258         case SCTP_IPV6_ADDRESS:
2259                 /* source addr is IPv6 */
2260                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2261                 store.sin6.sin6_family = AF_INET6;
2262                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2263                 store.sin6.sin6_scope_id = cookie->scope_id;
2264                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2265                 break;
2266 #endif
2267         default:
2268                 atomic_add_int(&stcb->asoc.refcnt, 1);
2269 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2270                 SCTP_TCB_UNLOCK(stcb);
2271                 SCTP_SOCKET_LOCK(so, 1);
2272                 SCTP_TCB_LOCK(stcb);
2273 #endif
2274                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2275 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2276                 SCTP_SOCKET_UNLOCK(so, 1);
2277 #endif
2278                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2279                 return (NULL);
2280         }
2281
2282         /* set up to notify upper layer */
2283         *notification = SCTP_NOTIFY_ASSOC_UP;
2284         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2285             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2286             (inp->sctp_socket->so_qlimit == 0)) {
2287                 /*
2288                  * This is an endpoint that called connect() how it got a
2289                  * cookie that is NEW is a bit of a mystery. It must be that
2290                  * the INIT was sent, but before it got there.. a complete
2291                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2292                  * should have went to the other code.. not here.. oh well..
2293                  * a bit of protection is worth having..
2294                  */
2295                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2296 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2297                 atomic_add_int(&stcb->asoc.refcnt, 1);
2298                 SCTP_TCB_UNLOCK(stcb);
2299                 SCTP_SOCKET_LOCK(so, 1);
2300                 SCTP_TCB_LOCK(stcb);
2301                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2302                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2303                         SCTP_SOCKET_UNLOCK(so, 1);
2304                         return (NULL);
2305                 }
2306 #endif
2307                 soisconnected(stcb->sctp_socket);
2308 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2309                 SCTP_SOCKET_UNLOCK(so, 1);
2310 #endif
2311         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2312             (inp->sctp_socket->so_qlimit)) {
2313                 /*
2314                  * We don't want to do anything with this one. Since it is
2315                  * the listening guy. The timer will get started for
2316                  * accepted connections in the caller.
2317                  */
2318                 ;
2319         }
2320         /* since we did not send a HB make sure we don't double things */
2321         if ((netp) && (*netp))
2322                 (*netp)->hb_responded = 1;
2323
2324         if (stcb->asoc.sctp_autoclose_ticks &&
2325             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2326                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2327         }
2328         /* calculate the RTT */
2329         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2330         if ((netp) && (*netp)) {
2331                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2332                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2333                     SCTP_RTT_FROM_NON_DATA);
2334         }
2335         /* respond with a COOKIE-ACK */
2336         sctp_send_cookie_ack(stcb);
2337
2338         /*
2339          * check the address lists for any ASCONFs that need to be sent
2340          * AFTER the cookie-ack is sent
2341          */
2342         sctp_check_address_list(stcb, m,
2343             initack_offset + sizeof(struct sctp_init_ack_chunk),
2344             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2345             &store.sa, cookie->local_scope, cookie->site_scope,
2346             cookie->ipv4_scope, cookie->loopback_scope);
2347
2348
2349         return (stcb);
2350 }
2351
2352 /*
2353  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2354  * we NEED to make sure we are not already using the vtag. If so we
2355  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2356         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2357                                                             SCTP_BASE_INFO(hashasocmark))];
2358         LIST_FOREACH(stcb, head, sctp_asocs) {
2359                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2360                        -- SEND ABORT - TRY AGAIN --
2361                 }
2362         }
2363 */
2364
2365 /*
2366  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2367  * existing (non-NULL) TCB
2368  */
2369 static struct mbuf *
2370 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2371     struct sockaddr *src, struct sockaddr *dst,
2372     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2373     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2374     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2375     struct sctp_tcb **locked_tcb,
2376     uint8_t mflowtype, uint32_t mflowid,
2377     uint32_t vrf_id, uint16_t port)
2378 {
2379         struct sctp_state_cookie *cookie;
2380         struct sctp_tcb *l_stcb = *stcb;
2381         struct sctp_inpcb *l_inp;
2382         struct sockaddr *to;
2383         struct sctp_pcb *ep;
2384         struct mbuf *m_sig;
2385         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2386         uint8_t *sig;
2387         uint8_t cookie_ok = 0;
2388         unsigned int sig_offset, cookie_offset;
2389         unsigned int cookie_len;
2390         struct timeval now;
2391         struct timeval time_expires;
2392         int notification = 0;
2393         struct sctp_nets *netl;
2394         int had_a_existing_tcb = 0;
2395         int send_int_conf = 0;
2396
2397 #ifdef INET
2398         struct sockaddr_in sin;
2399
2400 #endif
2401 #ifdef INET6
2402         struct sockaddr_in6 sin6;
2403
2404 #endif
2405
2406         SCTPDBG(SCTP_DEBUG_INPUT2,
2407             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2408
2409         if (inp_p == NULL) {
2410                 return (NULL);
2411         }
2412         cookie = &cp->cookie;
2413         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2414         cookie_len = ntohs(cp->ch.chunk_length);
2415
2416         if ((cookie->peerport != sh->src_port) &&
2417             (cookie->myport != sh->dest_port) &&
2418             (cookie->my_vtag != sh->v_tag)) {
2419                 /*
2420                  * invalid ports or bad tag.  Note that we always leave the
2421                  * v_tag in the header in network order and when we stored
2422                  * it in the my_vtag slot we also left it in network order.
2423                  * This maintains the match even though it may be in the
2424                  * opposite byte order of the machine :->
2425                  */
2426                 return (NULL);
2427         }
2428         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2429             sizeof(struct sctp_init_chunk) +
2430             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2431                 /* cookie too small */
2432                 return (NULL);
2433         }
2434         /*
2435          * split off the signature into its own mbuf (since it should not be
2436          * calculated in the sctp_hmac_m() call).
2437          */
2438         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2439         m_sig = m_split(m, sig_offset, M_NOWAIT);
2440         if (m_sig == NULL) {
2441                 /* out of memory or ?? */
2442                 return (NULL);
2443         }
2444 #ifdef SCTP_MBUF_LOGGING
2445         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2446                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2447         }
2448 #endif
2449
2450         /*
2451          * compute the signature/digest for the cookie
2452          */
2453         ep = &(*inp_p)->sctp_ep;
2454         l_inp = *inp_p;
2455         if (l_stcb) {
2456                 SCTP_TCB_UNLOCK(l_stcb);
2457         }
2458         SCTP_INP_RLOCK(l_inp);
2459         if (l_stcb) {
2460                 SCTP_TCB_LOCK(l_stcb);
2461         }
2462         /* which cookie is it? */
2463         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2464             (ep->current_secret_number != ep->last_secret_number)) {
2465                 /* it's the old cookie */
2466                 (void)sctp_hmac_m(SCTP_HMAC,
2467                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2468                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2469         } else {
2470                 /* it's the current cookie */
2471                 (void)sctp_hmac_m(SCTP_HMAC,
2472                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2473                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2474         }
2475         /* get the signature */
2476         SCTP_INP_RUNLOCK(l_inp);
2477         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2478         if (sig == NULL) {
2479                 /* couldn't find signature */
2480                 sctp_m_freem(m_sig);
2481                 return (NULL);
2482         }
2483         /* compare the received digest with the computed digest */
2484         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2485                 /* try the old cookie? */
2486                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2487                     (ep->current_secret_number != ep->last_secret_number)) {
2488                         /* compute digest with old */
2489                         (void)sctp_hmac_m(SCTP_HMAC,
2490                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2491                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2492                         /* compare */
2493                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2494                                 cookie_ok = 1;
2495                 }
2496         } else {
2497                 cookie_ok = 1;
2498         }
2499
2500         /*
2501          * Now before we continue we must reconstruct our mbuf so that
2502          * normal processing of any other chunks will work.
2503          */
2504         {
2505                 struct mbuf *m_at;
2506
2507                 m_at = m;
2508                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2509                         m_at = SCTP_BUF_NEXT(m_at);
2510                 }
2511                 SCTP_BUF_NEXT(m_at) = m_sig;
2512         }
2513
2514         if (cookie_ok == 0) {
2515                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2516                 SCTPDBG(SCTP_DEBUG_INPUT2,
2517                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2518                     (uint32_t) offset, cookie_offset, sig_offset);
2519                 return (NULL);
2520         }
2521         /*
2522          * check the cookie timestamps to be sure it's not stale
2523          */
2524         (void)SCTP_GETTIME_TIMEVAL(&now);
2525         /* Expire time is in Ticks, so we convert to seconds */
2526         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2527         time_expires.tv_usec = cookie->time_entered.tv_usec;
2528         /*
2529          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2530          * is undefined.
2531          */
2532         if (timevalcmp(&now, &time_expires, >)) {
2533                 /* cookie is stale! */
2534                 struct mbuf *op_err;
2535                 struct sctp_stale_cookie_msg *scm;
2536                 uint32_t tim;
2537
2538                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2539                     0, M_NOWAIT, 1, MT_DATA);
2540                 if (op_err == NULL) {
2541                         /* FOOBAR */
2542                         return (NULL);
2543                 }
2544                 /* Set the len */
2545                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2546                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2547                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2548                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2549                     (sizeof(uint32_t))));
2550                 /* seconds to usec */
2551                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2552                 /* add in usec */
2553                 if (tim == 0)
2554                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2555                 scm->time_usec = htonl(tim);
2556                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2557                     mflowtype, mflowid,
2558                     vrf_id, port);
2559                 return (NULL);
2560         }
2561         /*
2562          * Now we must see with the lookup address if we have an existing
2563          * asoc. This will only happen if we were in the COOKIE-WAIT state
2564          * and a INIT collided with us and somewhere the peer sent the
2565          * cookie on another address besides the single address our assoc
2566          * had for him. In this case we will have one of the tie-tags set at
2567          * least AND the address field in the cookie can be used to look it
2568          * up.
2569          */
2570         to = NULL;
2571         switch (cookie->addr_type) {
2572 #ifdef INET6
2573         case SCTP_IPV6_ADDRESS:
2574                 memset(&sin6, 0, sizeof(sin6));
2575                 sin6.sin6_family = AF_INET6;
2576                 sin6.sin6_len = sizeof(sin6);
2577                 sin6.sin6_port = sh->src_port;
2578                 sin6.sin6_scope_id = cookie->scope_id;
2579                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2580                     sizeof(sin6.sin6_addr.s6_addr));
2581                 to = (struct sockaddr *)&sin6;
2582                 break;
2583 #endif
2584 #ifdef INET
2585         case SCTP_IPV4_ADDRESS:
2586                 memset(&sin, 0, sizeof(sin));
2587                 sin.sin_family = AF_INET;
2588                 sin.sin_len = sizeof(sin);
2589                 sin.sin_port = sh->src_port;
2590                 sin.sin_addr.s_addr = cookie->address[0];
2591                 to = (struct sockaddr *)&sin;
2592                 break;
2593 #endif
2594         default:
2595                 /* This should not happen */
2596                 return (NULL);
2597         }
2598         if (*stcb == NULL) {
2599                 /* Yep, lets check */
2600                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2601                 if (*stcb == NULL) {
2602                         /*
2603                          * We should have only got back the same inp. If we
2604                          * got back a different ep we have a problem. The
2605                          * original findep got back l_inp and now
2606                          */
2607                         if (l_inp != *inp_p) {
2608                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2609                         }
2610                 } else {
2611                         if (*locked_tcb == NULL) {
2612                                 /*
2613                                  * In this case we found the assoc only
2614                                  * after we locked the create lock. This
2615                                  * means we are in a colliding case and we
2616                                  * must make sure that we unlock the tcb if
2617                                  * its one of the cases where we throw away
2618                                  * the incoming packets.
2619                                  */
2620                                 *locked_tcb = *stcb;
2621
2622                                 /*
2623                                  * We must also increment the inp ref count
2624                                  * since the ref_count flags was set when we
2625                                  * did not find the TCB, now we found it
2626                                  * which reduces the refcount.. we must
2627                                  * raise it back out to balance it all :-)
2628                                  */
2629                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2630                                 if ((*stcb)->sctp_ep != l_inp) {
2631                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2632                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2633                                 }
2634                         }
2635                 }
2636         }
2637         cookie_len -= SCTP_SIGNATURE_SIZE;
2638         if (*stcb == NULL) {
2639                 /* this is the "normal" case... get a new TCB */
2640                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2641                     cookie, cookie_len, *inp_p,
2642                     netp, to, &notification,
2643                     auth_skipped, auth_offset, auth_len,
2644                     mflowtype, mflowid,
2645                     vrf_id, port);
2646         } else {
2647                 /* this is abnormal... cookie-echo on existing TCB */
2648                 had_a_existing_tcb = 1;
2649                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2650                     src, dst, sh,
2651                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2652                     &notification, auth_skipped, auth_offset, auth_len,
2653                     mflowtype, mflowid,
2654                     vrf_id, port);
2655         }
2656
2657         if (*stcb == NULL) {
2658                 /* still no TCB... must be bad cookie-echo */
2659                 return (NULL);
2660         }
2661         if ((*netp != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
2662                 (*netp)->flowtype = mflowtype;
2663         }
2664         /*
2665          * Ok, we built an association so confirm the address we sent the
2666          * INIT-ACK to.
2667          */
2668         netl = sctp_findnet(*stcb, to);
2669         /*
2670          * This code should in theory NOT run but
2671          */
2672         if (netl == NULL) {
2673                 /* TSNH! Huh, why do I need to add this address here? */
2674                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2675                         return (NULL);
2676                 }
2677                 netl = sctp_findnet(*stcb, to);
2678         }
2679         if (netl) {
2680                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2681                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2682                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2683                             netl);
2684                         send_int_conf = 1;
2685                 }
2686         }
2687         sctp_start_net_timers(*stcb);
2688         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2689                 if (!had_a_existing_tcb ||
2690                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2691                         /*
2692                          * If we have a NEW cookie or the connect never
2693                          * reached the connected state during collision we
2694                          * must do the TCP accept thing.
2695                          */
2696                         struct socket *so, *oso;
2697                         struct sctp_inpcb *inp;
2698
2699                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2700                                 /*
2701                                  * For a restart we will keep the same
2702                                  * socket, no need to do anything. I THINK!!
2703                                  */
2704                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2705                                 if (send_int_conf) {
2706                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2707                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2708                                 }
2709                                 return (m);
2710                         }
2711                         oso = (*inp_p)->sctp_socket;
2712                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2713                         SCTP_TCB_UNLOCK((*stcb));
2714                         CURVNET_SET(oso->so_vnet);
2715                         so = sonewconn(oso, 0
2716                             );
2717                         CURVNET_RESTORE();
2718                         SCTP_TCB_LOCK((*stcb));
2719                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2720
2721                         if (so == NULL) {
2722                                 struct mbuf *op_err;
2723
2724 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2725                                 struct socket *pcb_so;
2726
2727 #endif
2728                                 /* Too many sockets */
2729                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2730                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2731                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2732                                     src, dst, sh, op_err,
2733                                     mflowtype, mflowid,
2734                                     vrf_id, port);
2735 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2736                                 pcb_so = SCTP_INP_SO(*inp_p);
2737                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2738                                 SCTP_TCB_UNLOCK((*stcb));
2739                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2740                                 SCTP_TCB_LOCK((*stcb));
2741                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2742 #endif
2743                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2744 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2745                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2746 #endif
2747                                 return (NULL);
2748                         }
2749                         inp = (struct sctp_inpcb *)so->so_pcb;
2750                         SCTP_INP_INCR_REF(inp);
2751                         /*
2752                          * We add the unbound flag here so that if we get an
2753                          * soabort() before we get the move_pcb done, we
2754                          * will properly cleanup.
2755                          */
2756                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2757                             SCTP_PCB_FLAGS_CONNECTED |
2758                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2759                             SCTP_PCB_FLAGS_UNBOUND |
2760                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2761                             SCTP_PCB_FLAGS_DONT_WAKE);
2762                         inp->sctp_features = (*inp_p)->sctp_features;
2763                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2764                         inp->sctp_socket = so;
2765                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2766                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2767                         inp->ecn_supported = (*inp_p)->ecn_supported;
2768                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2769                         inp->auth_supported = (*inp_p)->auth_supported;
2770                         inp->asconf_supported = (*inp_p)->asconf_supported;
2771                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2772                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2773                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2774                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2775                         inp->sctp_context = (*inp_p)->sctp_context;
2776                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2777                         inp->inp_starting_point_for_iterator = NULL;
2778                         /*
2779                          * copy in the authentication parameters from the
2780                          * original endpoint
2781                          */
2782                         if (inp->sctp_ep.local_hmacs)
2783                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2784                         inp->sctp_ep.local_hmacs =
2785                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2786                         if (inp->sctp_ep.local_auth_chunks)
2787                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2788                         inp->sctp_ep.local_auth_chunks =
2789                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2790
2791                         /*
2792                          * Now we must move it from one hash table to
2793                          * another and get the tcb in the right place.
2794                          */
2795
2796                         /*
2797                          * This is where the one-2-one socket is put into
2798                          * the accept state waiting for the accept!
2799                          */
2800                         if (*stcb) {
2801                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2802                         }
2803                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2804
2805                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2806                         SCTP_TCB_UNLOCK((*stcb));
2807
2808                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2809                             0);
2810                         SCTP_TCB_LOCK((*stcb));
2811                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2812
2813
2814                         /*
2815                          * now we must check to see if we were aborted while
2816                          * the move was going on and the lock/unlock
2817                          * happened.
2818                          */
2819                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2820                                 /*
2821                                  * yep it was, we leave the assoc attached
2822                                  * to the socket since the sctp_inpcb_free()
2823                                  * call will send an abort for us.
2824                                  */
2825                                 SCTP_INP_DECR_REF(inp);
2826                                 return (NULL);
2827                         }
2828                         SCTP_INP_DECR_REF(inp);
2829                         /* Switch over to the new guy */
2830                         *inp_p = inp;
2831                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2832                         if (send_int_conf) {
2833                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2834                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2835                         }
2836                         /*
2837                          * Pull it from the incomplete queue and wake the
2838                          * guy
2839                          */
2840 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2841                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2842                         SCTP_TCB_UNLOCK((*stcb));
2843                         SCTP_SOCKET_LOCK(so, 1);
2844 #endif
2845                         soisconnected(so);
2846 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2847                         SCTP_TCB_LOCK((*stcb));
2848                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2849                         SCTP_SOCKET_UNLOCK(so, 1);
2850 #endif
2851                         return (m);
2852                 }
2853         }
2854         if (notification) {
2855                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2856         }
2857         if (send_int_conf) {
2858                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2859                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2860         }
2861         return (m);
2862 }
2863
2864 static void
2865 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2866     struct sctp_tcb *stcb, struct sctp_nets *net)
2867 {
2868         /* cp must not be used, others call this without a c-ack :-) */
2869         struct sctp_association *asoc;
2870
2871         SCTPDBG(SCTP_DEBUG_INPUT2,
2872             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2873         if ((stcb == NULL) || (net == NULL)) {
2874                 return;
2875         }
2876         asoc = &stcb->asoc;
2877
2878         sctp_stop_all_cookie_timers(stcb);
2879         /* process according to association state */
2880         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2881                 /* state change only needed when I am in right state */
2882                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2883                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2884                 sctp_start_net_timers(stcb);
2885                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2886                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2887                             stcb->sctp_ep, stcb, asoc->primary_destination);
2888
2889                 }
2890                 /* update RTO */
2891                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2892                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2893                 if (asoc->overall_error_count == 0) {
2894                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2895                             &asoc->time_entered, sctp_align_safe_nocopy,
2896                             SCTP_RTT_FROM_NON_DATA);
2897                 }
2898                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2899                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2900                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2901                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2902 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2903                         struct socket *so;
2904
2905 #endif
2906                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2907 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2908                         so = SCTP_INP_SO(stcb->sctp_ep);
2909                         atomic_add_int(&stcb->asoc.refcnt, 1);
2910                         SCTP_TCB_UNLOCK(stcb);
2911                         SCTP_SOCKET_LOCK(so, 1);
2912                         SCTP_TCB_LOCK(stcb);
2913                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2914 #endif
2915                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2916                                 soisconnected(stcb->sctp_socket);
2917                         }
2918 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2919                         SCTP_SOCKET_UNLOCK(so, 1);
2920 #endif
2921                 }
2922                 /*
2923                  * since we did not send a HB make sure we don't double
2924                  * things
2925                  */
2926                 net->hb_responded = 1;
2927
2928                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2929                         /*
2930                          * We don't need to do the asconf thing, nor hb or
2931                          * autoclose if the socket is closed.
2932                          */
2933                         goto closed_socket;
2934                 }
2935                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2936                     stcb, net);
2937
2938
2939                 if (stcb->asoc.sctp_autoclose_ticks &&
2940                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2941                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2942                             stcb->sctp_ep, stcb, NULL);
2943                 }
2944                 /*
2945                  * send ASCONF if parameters are pending and ASCONFs are
2946                  * allowed (eg. addresses changed when init/cookie echo were
2947                  * in flight)
2948                  */
2949                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
2950                     (stcb->asoc.asconf_supported == 1) &&
2951                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2952 #ifdef SCTP_TIMER_BASED_ASCONF
2953                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2954                             stcb->sctp_ep, stcb,
2955                             stcb->asoc.primary_destination);
2956 #else
2957                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
2958                             SCTP_ADDR_NOT_LOCKED);
2959 #endif
2960                 }
2961         }
2962 closed_socket:
2963         /* Toss the cookie if I can */
2964         sctp_toss_old_cookies(stcb, asoc);
2965         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2966                 /* Restart the timer if we have pending data */
2967                 struct sctp_tmit_chunk *chk;
2968
2969                 chk = TAILQ_FIRST(&asoc->sent_queue);
2970                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
2971         }
2972 }
2973
2974 static void
2975 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2976     struct sctp_tcb *stcb)
2977 {
2978         struct sctp_nets *net;
2979         struct sctp_tmit_chunk *lchk;
2980         struct sctp_ecne_chunk bkup;
2981         uint8_t override_bit;
2982         uint32_t tsn, window_data_tsn;
2983         int len;
2984         unsigned int pkt_cnt;
2985
2986         len = ntohs(cp->ch.chunk_length);
2987         if ((len != sizeof(struct sctp_ecne_chunk)) &&
2988             (len != sizeof(struct old_sctp_ecne_chunk))) {
2989                 return;
2990         }
2991         if (len == sizeof(struct old_sctp_ecne_chunk)) {
2992                 /* Its the old format */
2993                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
2994                 bkup.num_pkts_since_cwr = htonl(1);
2995                 cp = &bkup;
2996         }
2997         SCTP_STAT_INCR(sctps_recvecne);
2998         tsn = ntohl(cp->tsn);
2999         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3000         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3001         if (lchk == NULL) {
3002                 window_data_tsn = stcb->asoc.sending_seq - 1;
3003         } else {
3004                 window_data_tsn = lchk->rec.data.TSN_seq;
3005         }
3006
3007         /* Find where it was sent to if possible. */
3008         net = NULL;
3009         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3010                 if (lchk->rec.data.TSN_seq == tsn) {
3011                         net = lchk->whoTo;
3012                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3013                         break;
3014                 }
3015                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3016                         break;
3017                 }
3018         }
3019         if (net == NULL) {
3020                 /*
3021                  * What to do. A previous send of a CWR was possibly lost.
3022                  * See how old it is, we may have it marked on the actual
3023                  * net.
3024                  */
3025                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3026                         if (tsn == net->last_cwr_tsn) {
3027                                 /* Found him, send it off */
3028                                 break;
3029                         }
3030                 }
3031                 if (net == NULL) {
3032                         /*
3033                          * If we reach here, we need to send a special CWR
3034                          * that says hey, we did this a long time ago and
3035                          * you lost the response.
3036                          */
3037                         net = TAILQ_FIRST(&stcb->asoc.nets);
3038                         if (net == NULL) {
3039                                 /* TSNH */
3040                                 return;
3041                         }
3042                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3043                 } else {
3044                         override_bit = 0;
3045                 }
3046         } else {
3047                 override_bit = 0;
3048         }
3049         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3050             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3051                 /*
3052                  * JRS - Use the congestion control given in the pluggable
3053                  * CC module
3054                  */
3055                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3056                 /*
3057                  * We reduce once every RTT. So we will only lower cwnd at
3058                  * the next sending seq i.e. the window_data_tsn
3059                  */
3060                 net->cwr_window_tsn = window_data_tsn;
3061                 net->ecn_ce_pkt_cnt += pkt_cnt;
3062                 net->lost_cnt = pkt_cnt;
3063                 net->last_cwr_tsn = tsn;
3064         } else {
3065                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3066                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3067                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3068                         /*
3069                          * Another loss in the same window update how many
3070                          * marks/packets lost we have had.
3071                          */
3072                         int cnt = 1;
3073
3074                         if (pkt_cnt > net->lost_cnt) {
3075                                 /* Should be the case */
3076                                 cnt = (pkt_cnt - net->lost_cnt);
3077                                 net->ecn_ce_pkt_cnt += cnt;
3078                         }
3079                         net->lost_cnt = pkt_cnt;
3080                         net->last_cwr_tsn = tsn;
3081                         /*
3082                          * Most CC functions will ignore this call, since we
3083                          * are in-window yet of the initial CE the peer saw.
3084                          */
3085                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3086                 }
3087         }
3088         /*
3089          * We always send a CWR this way if our previous one was lost our
3090          * peer will get an update, or if it is not time again to reduce we
3091          * still get the cwr to the peer. Note we set the override when we
3092          * could not find the TSN on the chunk or the destination network.
3093          */
3094         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3095 }
3096
3097 static void
3098 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3099 {
3100         /*
3101          * Here we get a CWR from the peer. We must look in the outqueue and
3102          * make sure that we have a covered ECNE in the control chunk part.
3103          * If so remove it.
3104          */
3105         struct sctp_tmit_chunk *chk;
3106         struct sctp_ecne_chunk *ecne;
3107         int override;
3108         uint32_t cwr_tsn;
3109
3110         cwr_tsn = ntohl(cp->tsn);
3111         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3112         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3113                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3114                         continue;
3115                 }
3116                 if ((override == 0) && (chk->whoTo != net)) {
3117                         /* Must be from the right src unless override is set */
3118                         continue;
3119                 }
3120                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3121                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3122                         /* this covers this ECNE, we can remove it */
3123                         stcb->asoc.ecn_echo_cnt_onq--;
3124                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3125                             sctp_next);
3126                         sctp_m_freem(chk->data);
3127                         chk->data = NULL;
3128                         stcb->asoc.ctrl_queue_cnt--;
3129                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3130                         if (override == 0) {
3131                                 break;
3132                         }
3133                 }
3134         }
3135 }
3136
3137 static void
3138 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3139     struct sctp_tcb *stcb, struct sctp_nets *net)
3140 {
3141         struct sctp_association *asoc;
3142
3143 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3144         struct socket *so;
3145
3146 #endif
3147
3148         SCTPDBG(SCTP_DEBUG_INPUT2,
3149             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3150         if (stcb == NULL)
3151                 return;
3152
3153         asoc = &stcb->asoc;
3154         /* process according to association state */
3155         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3156                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3157                 SCTPDBG(SCTP_DEBUG_INPUT2,
3158                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3159                 SCTP_TCB_UNLOCK(stcb);
3160                 return;
3161         }
3162         /* notify upper layer protocol */
3163         if (stcb->sctp_socket) {
3164                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3165         }
3166 #ifdef INVARIANTS
3167         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3168             !TAILQ_EMPTY(&asoc->sent_queue) ||
3169             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3170                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3171         }
3172 #endif
3173         /* stop the timer */
3174         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
3175         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3176         /* free the TCB */
3177         SCTPDBG(SCTP_DEBUG_INPUT2,
3178             "sctp_handle_shutdown_complete: calls free-asoc\n");
3179 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3180         so = SCTP_INP_SO(stcb->sctp_ep);
3181         atomic_add_int(&stcb->asoc.refcnt, 1);
3182         SCTP_TCB_UNLOCK(stcb);
3183         SCTP_SOCKET_LOCK(so, 1);
3184         SCTP_TCB_LOCK(stcb);
3185         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3186 #endif
3187         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3188 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3189         SCTP_SOCKET_UNLOCK(so, 1);
3190 #endif
3191         return;
3192 }
3193
3194 static int
3195 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3196     struct sctp_nets *net, uint8_t flg)
3197 {
3198         switch (desc->chunk_type) {
3199         case SCTP_DATA:
3200                 /* find the tsn to resend (possibly */
3201                 {
3202                         uint32_t tsn;
3203                         struct sctp_tmit_chunk *tp1;
3204
3205                         tsn = ntohl(desc->tsn_ifany);
3206                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3207                                 if (tp1->rec.data.TSN_seq == tsn) {
3208                                         /* found it */
3209                                         break;
3210                                 }
3211                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3212                                         /* not found */
3213                                         tp1 = NULL;
3214                                         break;
3215                                 }
3216                         }
3217                         if (tp1 == NULL) {
3218                                 /*
3219                                  * Do it the other way , aka without paying
3220                                  * attention to queue seq order.
3221                                  */
3222                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3223                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3224                                         if (tp1->rec.data.TSN_seq == tsn) {
3225                                                 /* found it */
3226                                                 break;
3227                                         }
3228                                 }
3229                         }
3230                         if (tp1 == NULL) {
3231                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3232                         }
3233                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3234                                 uint8_t *ddp;
3235
3236                                 if (((flg & SCTP_BADCRC) == 0) &&
3237                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3238                                         return (0);
3239                                 }
3240                                 if ((stcb->asoc.peers_rwnd == 0) &&
3241                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3242                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3243                                         return (0);
3244                                 }
3245                                 if (stcb->asoc.peers_rwnd == 0 &&
3246                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3247                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3248                                         return (0);
3249                                 }
3250                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3251                                     sizeof(struct sctp_data_chunk));
3252                                 {
3253                                         unsigned int iii;
3254
3255                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3256                                             iii++) {
3257                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3258                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3259                                                         return (-1);
3260                                                 }
3261                                         }
3262                                 }
3263
3264                                 if (tp1->do_rtt) {
3265                                         /*
3266                                          * this guy had a RTO calculation
3267                                          * pending on it, cancel it
3268                                          */
3269                                         if (tp1->whoTo->rto_needed == 0) {
3270                                                 tp1->whoTo->rto_needed = 1;
3271                                         }
3272                                         tp1->do_rtt = 0;
3273                                 }
3274                                 SCTP_STAT_INCR(sctps_pdrpmark);
3275                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3276                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3277                                 /*
3278                                  * mark it as if we were doing a FR, since
3279                                  * we will be getting gap ack reports behind
3280                                  * the info from the router.
3281                                  */
3282                                 tp1->rec.data.doing_fast_retransmit = 1;
3283                                 /*
3284                                  * mark the tsn with what sequences can
3285                                  * cause a new FR.
3286                                  */
3287                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3288                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3289                                 } else {
3290                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3291                                 }
3292
3293                                 /* restart the timer */
3294                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3295                                     stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3296                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3297                                     stcb, tp1->whoTo);
3298
3299                                 /* fix counts and things */
3300                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3301                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3302                                             tp1->whoTo->flight_size,
3303                                             tp1->book_size,
3304                                             (uintptr_t) stcb,
3305                                             tp1->rec.data.TSN_seq);
3306                                 }
3307                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3308                                         sctp_flight_size_decrease(tp1);
3309                                         sctp_total_flight_decrease(stcb, tp1);
3310                                 }
3311                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3312                         } {
3313                                 /* audit code */
3314                                 unsigned int audit;
3315
3316                                 audit = 0;
3317                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3318                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3319                                                 audit++;
3320                                 }
3321                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3322                                     sctp_next) {
3323                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3324                                                 audit++;
3325                                 }
3326                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3327                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3328                                             audit, stcb->asoc.sent_queue_retran_cnt);
3329 #ifndef SCTP_AUDITING_ENABLED
3330                                         stcb->asoc.sent_queue_retran_cnt = audit;
3331 #endif
3332                                 }
3333                         }
3334                 }
3335                 break;
3336         case SCTP_ASCONF:
3337                 {
3338                         struct sctp_tmit_chunk *asconf;
3339
3340                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3341                             sctp_next) {
3342                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3343                                         break;
3344                                 }
3345                         }
3346                         if (asconf) {
3347                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3348                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3349                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3350                                 asconf->snd_count--;
3351                         }
3352                 }
3353                 break;
3354         case SCTP_INITIATION:
3355                 /* resend the INIT */
3356                 stcb->asoc.dropped_special_cnt++;
3357                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3358                         /*
3359                          * If we can get it in, in a few attempts we do
3360                          * this, otherwise we let the timer fire.
3361                          */
3362                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3363                             stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3364                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3365                 }
3366                 break;
3367         case SCTP_SELECTIVE_ACK:
3368         case SCTP_NR_SELECTIVE_ACK:
3369                 /* resend the sack */
3370                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3371                 break;
3372         case SCTP_HEARTBEAT_REQUEST:
3373                 /* resend a demand HB */
3374                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3375                         /*
3376                          * Only retransmit if we KNOW we wont destroy the
3377                          * tcb
3378                          */
3379                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3380                 }
3381                 break;
3382         case SCTP_SHUTDOWN:
3383                 sctp_send_shutdown(stcb, net);
3384                 break;
3385         case SCTP_SHUTDOWN_ACK:
3386                 sctp_send_shutdown_ack(stcb, net);
3387                 break;
3388         case SCTP_COOKIE_ECHO:
3389                 {
3390                         struct sctp_tmit_chunk *cookie;
3391
3392                         cookie = NULL;
3393                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3394                             sctp_next) {
3395                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3396                                         break;
3397                                 }
3398                         }
3399                         if (cookie) {
3400                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3401                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3402                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3403                                 sctp_stop_all_cookie_timers(stcb);
3404                         }
3405                 }
3406                 break;
3407         case SCTP_COOKIE_ACK:
3408                 sctp_send_cookie_ack(stcb);
3409                 break;
3410         case SCTP_ASCONF_ACK:
3411                 /* resend last asconf ack */
3412                 sctp_send_asconf_ack(stcb);
3413                 break;
3414         case SCTP_FORWARD_CUM_TSN:
3415                 send_forward_tsn(stcb, &stcb->asoc);
3416                 break;
3417                 /* can't do anything with these */
3418         case SCTP_PACKET_DROPPED:
3419         case SCTP_INITIATION_ACK:       /* this should not happen */
3420         case SCTP_HEARTBEAT_ACK:
3421         case SCTP_ABORT_ASSOCIATION:
3422         case SCTP_OPERATION_ERROR:
3423         case SCTP_SHUTDOWN_COMPLETE:
3424         case SCTP_ECN_ECHO:
3425         case SCTP_ECN_CWR:
3426         default:
3427                 break;
3428         }
3429         return (0);
3430 }
3431
3432 void
3433 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3434 {
3435         uint32_t i;
3436         uint16_t temp;
3437
3438         /*
3439          * We set things to 0xffff since this is the last delivered sequence
3440          * and we will be sending in 0 after the reset.
3441          */
3442
3443         if (number_entries) {
3444                 for (i = 0; i < number_entries; i++) {
3445                         temp = ntohs(list[i]);
3446                         if (temp >= stcb->asoc.streamincnt) {
3447                                 continue;
3448                         }
3449                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3450                 }
3451         } else {
3452                 list = NULL;
3453                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3454                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3455                 }
3456         }
3457         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3458 }
3459
3460 static void
3461 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3462 {
3463         uint32_t i;
3464         uint16_t temp;
3465
3466         if (number_entries > 0) {
3467                 for (i = 0; i < number_entries; i++) {
3468                         temp = ntohs(list[i]);
3469                         if (temp >= stcb->asoc.streamoutcnt) {
3470                                 /* no such stream */
3471                                 continue;
3472                         }
3473                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3474                 }
3475         } else {
3476                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3477                         stcb->asoc.strmout[i].next_sequence_send = 0;
3478                 }
3479         }
3480         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3481 }
3482
3483
3484 struct sctp_stream_reset_request *
3485 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3486 {
3487         struct sctp_association *asoc;
3488         struct sctp_chunkhdr *ch;
3489         struct sctp_stream_reset_request *r;
3490         struct sctp_tmit_chunk *chk;
3491         int len, clen;
3492
3493         asoc = &stcb->asoc;
3494         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3495                 asoc->stream_reset_outstanding = 0;
3496                 return (NULL);
3497         }
3498         if (stcb->asoc.str_reset == NULL) {
3499                 asoc->stream_reset_outstanding = 0;
3500                 return (NULL);
3501         }
3502         chk = stcb->asoc.str_reset;
3503         if (chk->data == NULL) {
3504                 return (NULL);
3505         }
3506         if (bchk) {
3507                 /* he wants a copy of the chk pointer */
3508                 *bchk = chk;
3509         }
3510         clen = chk->send_size;
3511         ch = mtod(chk->data, struct sctp_chunkhdr *);
3512         r = (struct sctp_stream_reset_request *)(ch + 1);
3513         if (ntohl(r->request_seq) == seq) {
3514                 /* found it */
3515                 return (r);
3516         }
3517         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3518         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3519                 /* move to the next one, there can only be a max of two */
3520                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3521                 if (ntohl(r->request_seq) == seq) {
3522                         return (r);
3523                 }
3524         }
3525         /* that seq is not here */
3526         return (NULL);
3527 }
3528
3529 static void
3530 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3531 {
3532         struct sctp_association *asoc;
3533         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3534
3535         if (stcb->asoc.str_reset == NULL) {
3536                 return;
3537         }
3538         asoc = &stcb->asoc;
3539
3540         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3541         TAILQ_REMOVE(&asoc->control_send_queue,
3542             chk,
3543             sctp_next);
3544         if (chk->data) {
3545                 sctp_m_freem(chk->data);
3546                 chk->data = NULL;
3547         }
3548         asoc->ctrl_queue_cnt--;
3549         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3550         /* sa_ignore NO_NULL_CHK */
3551         stcb->asoc.str_reset = NULL;
3552 }
3553
3554
3555 static int
3556 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3557     uint32_t seq, uint32_t action,
3558     struct sctp_stream_reset_response *respin)
3559 {
3560         uint16_t type;
3561         int lparm_len;
3562         struct sctp_association *asoc = &stcb->asoc;
3563         struct sctp_tmit_chunk *chk;
3564         struct sctp_stream_reset_request *req_param;
3565         struct sctp_stream_reset_out_request *req_out_param;
3566         struct sctp_stream_reset_in_request *req_in_param;
3567         uint32_t number_entries;
3568
3569         if (asoc->stream_reset_outstanding == 0) {
3570                 /* duplicate */
3571                 return (0);
3572         }
3573         if (seq == stcb->asoc.str_reset_seq_out) {
3574                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3575                 if (req_param != NULL) {
3576                         stcb->asoc.str_reset_seq_out++;
3577                         type = ntohs(req_param->ph.param_type);
3578                         lparm_len = ntohs(req_param->ph.param_length);
3579                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3580                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3581                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3582                                 asoc->stream_reset_out_is_outstanding = 0;
3583                                 if (asoc->stream_reset_outstanding)
3584                                         asoc->stream_reset_outstanding--;
3585                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3586                                         /* do it */
3587                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3588                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3589                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3590                                 } else {
3591                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3592                                 }
3593                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3594                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3595                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3596                                 if (asoc->stream_reset_outstanding)
3597                                         asoc->stream_reset_outstanding--;
3598                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3599                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3600                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3601                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3602                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3603                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3604                                 }
3605                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3606                                 /* Ok we now may have more streams */
3607                                 int num_stream;
3608
3609                                 num_stream = stcb->asoc.strm_pending_add_size;
3610                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3611                                         /* TSNH */
3612                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3613                                 }
3614                                 stcb->asoc.strm_pending_add_size = 0;
3615                                 if (asoc->stream_reset_outstanding)
3616                                         asoc->stream_reset_outstanding--;
3617                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3618                                         /* Put the new streams into effect */
3619                                         stcb->asoc.streamoutcnt += num_stream;
3620                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3621                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3622                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3623                                             SCTP_STREAM_CHANGE_DENIED);
3624                                 } else {
3625                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3626                                             SCTP_STREAM_CHANGE_FAILED);
3627                                 }
3628                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3629                                 if (asoc->stream_reset_outstanding)
3630                                         asoc->stream_reset_outstanding--;
3631                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3632                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3633                                             SCTP_STREAM_CHANGE_DENIED);
3634                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3635                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3636                                             SCTP_STREAM_CHANGE_FAILED);
3637                                 }
3638                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3639                                 /**
3640                                  * a) Adopt the new in tsn.
3641                                  * b) reset the map
3642                                  * c) Adopt the new out-tsn
3643                                  */
3644                                 struct sctp_stream_reset_response_tsn *resp;
3645                                 struct sctp_forward_tsn_chunk fwdtsn;
3646                                 int abort_flag = 0;
3647
3648                                 if (respin == NULL) {
3649                                         /* huh ? */
3650                                         return (0);
3651                                 }
3652                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3653                                         return (0);
3654                                 }
3655                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3656                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3657                                         asoc->stream_reset_outstanding--;
3658                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3659                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3660                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3661                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3662                                         if (abort_flag) {
3663                                                 return (1);
3664                                         }
3665                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3666                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3667                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3668                                         }
3669                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3670                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3671                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3672
3673                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3674                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3675
3676                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3677                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3678
3679                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3680                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3681                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3682                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3683                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3684                                             SCTP_ASSOC_RESET_DENIED);
3685                                 } else {
3686                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3687                                             SCTP_ASSOC_RESET_FAILED);
3688                                 }
3689                         }
3690                         /* get rid of the request and get the request flags */
3691                         if (asoc->stream_reset_outstanding == 0) {
3692                                 sctp_clean_up_stream_reset(stcb);
3693                         }
3694                 }
3695         }
3696         return (0);
3697 }
3698
3699 static void
3700 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3701     struct sctp_tmit_chunk *chk,
3702     struct sctp_stream_reset_in_request *req, int trunc)
3703 {
3704         uint32_t seq;
3705         int len, i;
3706         int number_entries;
3707         uint16_t temp;
3708
3709         /*
3710          * peer wants me to send a str-reset to him for my outgoing seq's if
3711          * seq_in is right.
3712          */
3713         struct sctp_association *asoc = &stcb->asoc;
3714
3715         seq = ntohl(req->request_seq);
3716         if (asoc->str_reset_seq_in == seq) {
3717                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3718                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3719                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3720                 } else if (trunc) {
3721                         /* Can't do it, since they exceeded our buffer size  */
3722                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3723                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3724                         len = ntohs(req->ph.param_length);
3725                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3726                         for (i = 0; i < number_entries; i++) {
3727                                 temp = ntohs(req->list_of_streams[i]);
3728                                 req->list_of_streams[i] = temp;
3729                         }
3730                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3731                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3732                             asoc->str_reset_seq_out,
3733                             seq, (asoc->sending_seq - 1));
3734                         asoc->stream_reset_out_is_outstanding = 1;
3735                         asoc->str_reset = chk;
3736                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3737                         stcb->asoc.stream_reset_outstanding++;
3738                 } else {
3739                         /* Can't do it, since we have sent one out */
3740                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3741                 }
3742                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3743                 asoc->str_reset_seq_in++;
3744         } else if (asoc->str_reset_seq_in - 1 == seq) {
3745                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3746         } else if (asoc->str_reset_seq_in - 2 == seq) {
3747                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3748         } else {
3749                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3750         }
3751 }
3752
3753 static int
3754 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3755     struct sctp_tmit_chunk *chk,
3756     struct sctp_stream_reset_tsn_request *req)
3757 {
3758         /* reset all in and out and update the tsn */
3759         /*
3760          * A) reset my str-seq's on in and out. B) Select a receive next,
3761          * and set cum-ack to it. Also process this selected number as a
3762          * fwd-tsn as well. C) set in the response my next sending seq.
3763          */
3764         struct sctp_forward_tsn_chunk fwdtsn;
3765         struct sctp_association *asoc = &stcb->asoc;
3766         int abort_flag = 0;
3767         uint32_t seq;
3768
3769         seq = ntohl(req->request_seq);
3770         if (asoc->str_reset_seq_in == seq) {
3771                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3772                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3773                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3774                 } else {
3775                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3776                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3777                         fwdtsn.ch.chunk_flags = 0;
3778                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3779                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3780                         if (abort_flag) {
3781                                 return (1);
3782                         }
3783                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3784                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3785                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3786                         }
3787                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3788                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3789                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3790                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3791                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3792                         atomic_add_int(&asoc->sending_seq, 1);
3793                         /* save off historical data for retrans */
3794                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3795                         asoc->last_sending_seq[0] = asoc->sending_seq;
3796                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3797                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3798                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3799                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3800                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3801                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3802                 }
3803                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3804                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3805                 asoc->str_reset_seq_in++;
3806         } else if (asoc->str_reset_seq_in - 1 == seq) {
3807                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3808                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3809         } else if (asoc->str_reset_seq_in - 2 == seq) {
3810                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3811                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3812         } else {
3813                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3814         }
3815         return (0);
3816 }
3817
3818 static void
3819 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3820     struct sctp_tmit_chunk *chk,
3821     struct sctp_stream_reset_out_request *req, int trunc)
3822 {
3823         uint32_t seq, tsn;
3824         int number_entries, len;
3825         struct sctp_association *asoc = &stcb->asoc;
3826
3827         seq = ntohl(req->request_seq);
3828
3829         /* now if its not a duplicate we process it */
3830         if (asoc->str_reset_seq_in == seq) {
3831                 len = ntohs(req->ph.param_length);
3832                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3833                 /*
3834                  * the sender is resetting, handle the list issue.. we must
3835                  * a) verify if we can do the reset, if so no problem b) If
3836                  * we can't do the reset we must copy the request. c) queue
3837                  * it, and setup the data in processor to trigger it off
3838                  * when needed and dequeue all the queued data.
3839                  */
3840                 tsn = ntohl(req->send_reset_at_tsn);
3841
3842                 /* move the reset action back one */
3843                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3844                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3845                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3846                 } else if (trunc) {
3847                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3848                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3849                         /* we can do it now */
3850                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3851                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3852                 } else {
3853                         /*
3854                          * we must queue it up and thus wait for the TSN's
3855                          * to arrive that are at or before tsn
3856                          */
3857                         struct sctp_stream_reset_list *liste;
3858                         int siz;
3859
3860                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3861                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3862                             siz, SCTP_M_STRESET);
3863                         if (liste == NULL) {
3864                                 /* gak out of memory */
3865                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3866                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3867                                 return;
3868                         }
3869                         liste->tsn = tsn;
3870                         liste->number_entries = number_entries;
3871                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3872                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3873                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3874                 }
3875                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3876                 asoc->str_reset_seq_in++;
3877         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3878                 /*
3879                  * one seq back, just echo back last action since my
3880                  * response was lost.
3881                  */
3882                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3883         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3884                 /*
3885                  * two seq back, just echo back last action since my
3886                  * response was lost.
3887                  */
3888                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3889         } else {
3890                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3891         }
3892 }
3893
3894 static void
3895 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3896     struct sctp_stream_reset_add_strm *str_add)
3897 {
3898         /*
3899          * Peer is requesting to add more streams. If its within our
3900          * max-streams we will allow it.
3901          */
3902         uint32_t num_stream, i;
3903         uint32_t seq;
3904         struct sctp_association *asoc = &stcb->asoc;
3905         struct sctp_queued_to_read *ctl, *nctl;
3906
3907         /* Get the number. */
3908         seq = ntohl(str_add->request_seq);
3909         num_stream = ntohs(str_add->number_of_streams);
3910         /* Now what would be the new total? */
3911         if (asoc->str_reset_seq_in == seq) {
3912                 num_stream += stcb->asoc.streamincnt;
3913                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3914                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3915                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3916                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
3917                     (num_stream > 0xffff)) {
3918                         /* We must reject it they ask for to many */
3919         denied:
3920                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3921                 } else {
3922                         /* Ok, we can do that :-) */
3923                         struct sctp_stream_in *oldstrm;
3924
3925                         /* save off the old */
3926                         oldstrm = stcb->asoc.strmin;
3927                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
3928                             (num_stream * sizeof(struct sctp_stream_in)),
3929                             SCTP_M_STRMI);
3930                         if (stcb->asoc.strmin == NULL) {
3931                                 stcb->asoc.strmin = oldstrm;
3932                                 goto denied;
3933                         }
3934                         /* copy off the old data */
3935                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
3936                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3937                                 stcb->asoc.strmin[i].stream_no = i;
3938                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
3939                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
3940                                 /* now anything on those queues? */
3941                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
3942                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
3943                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
3944                                 }
3945                         }
3946                         /* Init the new streams */
3947                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
3948                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
3949                                 stcb->asoc.strmin[i].stream_no = i;
3950                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3951                                 stcb->asoc.strmin[i].delivery_started = 0;
3952                         }
3953                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
3954                         /* update the size */
3955                         stcb->asoc.streamincnt = num_stream;
3956                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3957                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3958                 }
3959                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3960                 asoc->str_reset_seq_in++;
3961         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3962                 /*
3963                  * one seq back, just echo back last action since my
3964                  * response was lost.
3965                  */
3966                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3967         } else if ((asoc->str_reset_seq_in - 2) == seq) {
3968                 /*
3969                  * two seq back, just echo back last action since my
3970                  * response was lost.
3971                  */
3972                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3973         } else {
3974                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3975
3976         }
3977 }
3978
3979 static void
3980 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
3981     struct sctp_stream_reset_add_strm *str_add)
3982 {
3983         /*
3984          * Peer is requesting to add more streams. If its within our
3985          * max-streams we will allow it.
3986          */
3987         uint16_t num_stream;
3988         uint32_t seq;
3989         struct sctp_association *asoc = &stcb->asoc;
3990
3991         /* Get the number. */
3992         seq = ntohl(str_add->request_seq);
3993         num_stream = ntohs(str_add->number_of_streams);
3994         /* Now what would be the new total? */
3995         if (asoc->str_reset_seq_in == seq) {
3996                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
3997                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3998                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3999                 } else if (stcb->asoc.stream_reset_outstanding) {
4000                         /* We must reject it we have something pending */
4001                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4002                 } else {
4003                         /* Ok, we can do that :-) */
4004                         int mychk;
4005
4006                         mychk = stcb->asoc.streamoutcnt;
4007                         mychk += num_stream;
4008                         if (mychk < 0x10000) {
4009                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4010                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4011                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4012                                 }
4013                         } else {
4014                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4015                         }
4016                 }
4017                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4018                 asoc->str_reset_seq_in++;
4019         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4020                 /*
4021                  * one seq back, just echo back last action since my
4022                  * response was lost.
4023                  */
4024                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4025         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4026                 /*
4027                  * two seq back, just echo back last action since my
4028                  * response was lost.
4029                  */
4030                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4031         } else {
4032                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4033         }
4034 }
4035
4036 #ifdef __GNUC__
4037 __attribute__((noinline))
4038 #endif
4039         static int
4040             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4041         struct sctp_chunkhdr *ch_req)
4042 {
4043         uint16_t remaining_length, param_len, ptype;
4044         struct sctp_paramhdr pstore;
4045         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4046         uint32_t seq = 0;
4047         int num_req = 0;
4048         int trunc = 0;
4049         struct sctp_tmit_chunk *chk;
4050         struct sctp_chunkhdr *ch;
4051         struct sctp_paramhdr *ph;
4052         int ret_code = 0;
4053         int num_param = 0;
4054
4055         /* now it may be a reset or a reset-response */
4056         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4057
4058         /* setup for adding the response */
4059         sctp_alloc_a_chunk(stcb, chk);
4060         if (chk == NULL) {
4061                 return (ret_code);
4062         }
4063         chk->copy_by_ref = 0;
4064         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4065         chk->rec.chunk_id.can_take_data = 0;
4066         chk->flags = 0;
4067         chk->asoc = &stcb->asoc;
4068         chk->no_fr_allowed = 0;
4069         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4070         chk->book_size_scale = 0;
4071         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4072         if (chk->data == NULL) {
4073 strres_nochunk:
4074                 if (chk->data) {
4075                         sctp_m_freem(chk->data);
4076                         chk->data = NULL;
4077                 }
4078                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4079                 return (ret_code);
4080         }
4081         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4082
4083         /* setup chunk parameters */
4084         chk->sent = SCTP_DATAGRAM_UNSENT;
4085         chk->snd_count = 0;
4086         chk->whoTo = NULL;
4087
4088         ch = mtod(chk->data, struct sctp_chunkhdr *);
4089         ch->chunk_type = SCTP_STREAM_RESET;
4090         ch->chunk_flags = 0;
4091         ch->chunk_length = htons(chk->send_size);
4092         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4093         offset += sizeof(struct sctp_chunkhdr);
4094         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4095                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4096                 if (ph == NULL) {
4097                         /* TSNH */
4098                         break;
4099                 }
4100                 param_len = ntohs(ph->param_length);
4101                 if ((param_len > remaining_length) ||
4102                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4103                         /* bad parameter length */
4104                         break;
4105                 }
4106                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4107                     (uint8_t *) & cstore);
4108                 if (ph == NULL) {
4109                         /* TSNH */
4110                         break;
4111                 }
4112                 ptype = ntohs(ph->param_type);
4113                 num_param++;
4114                 if (param_len > sizeof(cstore)) {
4115                         trunc = 1;
4116                 } else {
4117                         trunc = 0;
4118                 }
4119                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4120                         /* hit the max of parameters already sorry.. */
4121                         break;
4122                 }
4123                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4124                         struct sctp_stream_reset_out_request *req_out;
4125
4126                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4127                                 break;
4128                         }
4129                         req_out = (struct sctp_stream_reset_out_request *)ph;
4130                         num_req++;
4131                         if (stcb->asoc.stream_reset_outstanding) {
4132                                 seq = ntohl(req_out->response_seq);
4133                                 if (seq == stcb->asoc.str_reset_seq_out) {
4134                                         /* implicit ack */
4135                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4136                                 }
4137                         }
4138                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4139                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4140                         struct sctp_stream_reset_add_strm *str_add;
4141
4142                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4143                                 break;
4144                         }
4145                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4146                         num_req++;
4147                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4148                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4149                         struct sctp_stream_reset_add_strm *str_add;
4150
4151                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4152                                 break;
4153                         }
4154                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4155                         num_req++;
4156                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4157                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4158                         struct sctp_stream_reset_in_request *req_in;
4159
4160                         num_req++;
4161                         req_in = (struct sctp_stream_reset_in_request *)ph;
4162                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4163                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4164                         struct sctp_stream_reset_tsn_request *req_tsn;
4165
4166                         num_req++;
4167                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4168                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4169                                 ret_code = 1;
4170                                 goto strres_nochunk;
4171                         }
4172                         /* no more */
4173                         break;
4174                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4175                         struct sctp_stream_reset_response *resp;
4176                         uint32_t result;
4177
4178                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4179                                 break;
4180                         }
4181                         resp = (struct sctp_stream_reset_response *)ph;
4182                         seq = ntohl(resp->response_seq);
4183                         result = ntohl(resp->result);
4184                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4185                                 ret_code = 1;
4186                                 goto strres_nochunk;
4187                         }
4188                 } else {
4189                         break;
4190                 }
4191                 offset += SCTP_SIZE32(param_len);
4192                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4193                         remaining_length -= SCTP_SIZE32(param_len);
4194                 } else {
4195                         remaining_length = 0;
4196                 }
4197         }
4198         if (num_req == 0) {
4199                 /* we have no response free the stuff */
4200                 goto strres_nochunk;
4201         }
4202         /* ok we have a chunk to link in */
4203         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4204             chk,
4205             sctp_next);
4206         stcb->asoc.ctrl_queue_cnt++;
4207         return (ret_code);
4208 }
4209
4210 /*
4211  * Handle a router or endpoints report of a packet loss, there are two ways
4212  * to handle this, either we get the whole packet and must disect it
4213  * ourselves (possibly with truncation and or corruption) or it is a summary
4214  * from a middle box that did the disectting for us.
4215  */
4216 static void
4217 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4218     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4219 {
4220         uint32_t bottle_bw, on_queue;
4221         uint16_t trunc_len;
4222         unsigned int chlen;
4223         unsigned int at;
4224         struct sctp_chunk_desc desc;
4225         struct sctp_chunkhdr *ch;
4226
4227         chlen = ntohs(cp->ch.chunk_length);
4228         chlen -= sizeof(struct sctp_pktdrop_chunk);
4229         /* XXX possible chlen underflow */
4230         if (chlen == 0) {
4231                 ch = NULL;
4232                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4233                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4234         } else {
4235                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4236                 chlen -= sizeof(struct sctphdr);
4237                 /* XXX possible chlen underflow */
4238                 memset(&desc, 0, sizeof(desc));
4239         }
4240         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4241         if (trunc_len > limit) {
4242                 trunc_len = limit;
4243         }
4244         /* now the chunks themselves */
4245         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4246                 desc.chunk_type = ch->chunk_type;
4247                 /* get amount we need to move */
4248                 at = ntohs(ch->chunk_length);
4249                 if (at < sizeof(struct sctp_chunkhdr)) {
4250                         /* corrupt chunk, maybe at the end? */
4251                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4252                         break;
4253                 }
4254                 if (trunc_len == 0) {
4255                         /* we are supposed to have all of it */
4256                         if (at > chlen) {
4257                                 /* corrupt skip it */
4258                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4259                                 break;
4260                         }
4261                 } else {
4262                         /* is there enough of it left ? */
4263                         if (desc.chunk_type == SCTP_DATA) {
4264                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4265                                     sizeof(desc.data_bytes))) {
4266                                         break;
4267                                 }
4268                         } else {
4269                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4270                                         break;
4271                                 }
4272                         }
4273                 }
4274                 if (desc.chunk_type == SCTP_DATA) {
4275                         /* can we get out the tsn? */
4276                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4277                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4278
4279                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4280                                 /* yep */
4281                                 struct sctp_data_chunk *dcp;
4282                                 uint8_t *ddp;
4283                                 unsigned int iii;
4284
4285                                 dcp = (struct sctp_data_chunk *)ch;
4286                                 ddp = (uint8_t *) (dcp + 1);
4287                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4288                                         desc.data_bytes[iii] = ddp[iii];
4289                                 }
4290                                 desc.tsn_ifany = dcp->dp.tsn;
4291                         } else {
4292                                 /* nope we are done. */
4293                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4294                                 break;
4295                         }
4296                 } else {
4297                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4298                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4299                 }
4300
4301                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4302                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4303                         break;
4304                 }
4305                 if (SCTP_SIZE32(at) > chlen) {
4306                         break;
4307                 }
4308                 chlen -= SCTP_SIZE32(at);
4309                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4310                         /* done, none left */
4311                         break;
4312                 }
4313                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4314         }
4315         /* Now update any rwnd --- possibly */
4316         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4317                 /* From a peer, we get a rwnd report */
4318                 uint32_t a_rwnd;
4319
4320                 SCTP_STAT_INCR(sctps_pdrpfehos);
4321
4322                 bottle_bw = ntohl(cp->bottle_bw);
4323                 on_queue = ntohl(cp->current_onq);
4324                 if (bottle_bw && on_queue) {
4325                         /* a rwnd report is in here */
4326                         if (bottle_bw > on_queue)
4327                                 a_rwnd = bottle_bw - on_queue;
4328                         else
4329                                 a_rwnd = 0;
4330
4331                         if (a_rwnd == 0)
4332                                 stcb->asoc.peers_rwnd = 0;
4333                         else {
4334                                 if (a_rwnd > stcb->asoc.total_flight) {
4335                                         stcb->asoc.peers_rwnd =
4336                                             a_rwnd - stcb->asoc.total_flight;
4337                                 } else {
4338                                         stcb->asoc.peers_rwnd = 0;
4339                                 }
4340                                 if (stcb->asoc.peers_rwnd <
4341                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4342                                         /* SWS sender side engages */
4343                                         stcb->asoc.peers_rwnd = 0;
4344                                 }
4345                         }
4346                 }
4347         } else {
4348                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4349         }
4350
4351         /* now middle boxes in sat networks get a cwnd bump */
4352         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4353             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4354             (stcb->asoc.sat_network)) {
4355                 /*
4356                  * This is debateable but for sat networks it makes sense
4357                  * Note if a T3 timer has went off, we will prohibit any
4358                  * changes to cwnd until we exit the t3 loss recovery.
4359                  */
4360                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4361                     net, cp, &bottle_bw, &on_queue);
4362         }
4363 }
4364
4365 /*
4366  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4367  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4368  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4369  * length of the complete packet outputs: - length: modified to remaining
4370  * length after control processing - netp: modified to new sctp_nets after
4371  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4372  * bad packet,...) otherwise return the tcb for this packet
4373  */
4374 #ifdef __GNUC__
4375 __attribute__((noinline))
4376 #endif
4377         static struct sctp_tcb *
4378                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4379              struct sockaddr *src, struct sockaddr *dst,
4380              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4381              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4382              uint8_t mflowtype, uint32_t mflowid,
4383              uint32_t vrf_id, uint16_t port)
4384 {
4385         struct sctp_association *asoc;
4386         struct mbuf *op_err;
4387         char msg[SCTP_DIAG_INFO_LEN];
4388         uint32_t vtag_in;
4389         int num_chunks = 0;     /* number of control chunks processed */
4390         uint32_t chk_length;
4391         int ret;
4392         int abort_no_unlock = 0;
4393         int ecne_seen = 0;
4394
4395         /*
4396          * How big should this be, and should it be alloc'd? Lets try the
4397          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4398          * until we get into jumbo grams and such..
4399          */
4400         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4401         struct sctp_tcb *locked_tcb = stcb;
4402         int got_auth = 0;
4403         uint32_t auth_offset = 0, auth_len = 0;
4404         int auth_skipped = 0;
4405         int asconf_cnt = 0;
4406
4407 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4408         struct socket *so;
4409
4410 #endif
4411
4412         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4413             iphlen, *offset, length, (void *)stcb);
4414
4415         /* validate chunk header length... */
4416         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4417                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4418                     ntohs(ch->chunk_length));
4419                 if (locked_tcb) {
4420                         SCTP_TCB_UNLOCK(locked_tcb);
4421                 }
4422                 return (NULL);
4423         }
4424         /*
4425          * validate the verification tag
4426          */
4427         vtag_in = ntohl(sh->v_tag);
4428
4429         if (locked_tcb) {
4430                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4431         }
4432         if (ch->chunk_type == SCTP_INITIATION) {
4433                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4434                     ntohs(ch->chunk_length), vtag_in);
4435                 if (vtag_in != 0) {
4436                         /* protocol error- silently discard... */
4437                         SCTP_STAT_INCR(sctps_badvtag);
4438                         if (locked_tcb) {
4439                                 SCTP_TCB_UNLOCK(locked_tcb);
4440                         }
4441                         return (NULL);
4442                 }
4443         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4444                 /*
4445                  * If there is no stcb, skip the AUTH chunk and process
4446                  * later after a stcb is found (to validate the lookup was
4447                  * valid.
4448                  */
4449                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4450                     (stcb == NULL) &&
4451                     (inp->auth_supported == 1)) {
4452                         /* save this chunk for later processing */
4453                         auth_skipped = 1;
4454                         auth_offset = *offset;
4455                         auth_len = ntohs(ch->chunk_length);
4456
4457                         /* (temporarily) move past this chunk */
4458                         *offset += SCTP_SIZE32(auth_len);
4459                         if (*offset >= length) {
4460                                 /* no more data left in the mbuf chain */
4461                                 *offset = length;
4462                                 if (locked_tcb) {
4463                                         SCTP_TCB_UNLOCK(locked_tcb);
4464                                 }
4465                                 return (NULL);
4466                         }
4467                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4468                             sizeof(struct sctp_chunkhdr), chunk_buf);
4469                 }
4470                 if (ch == NULL) {
4471                         /* Help */
4472                         *offset = length;
4473                         if (locked_tcb) {
4474                                 SCTP_TCB_UNLOCK(locked_tcb);
4475                         }
4476                         return (NULL);
4477                 }
4478                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4479                         goto process_control_chunks;
4480                 }
4481                 /*
4482                  * first check if it's an ASCONF with an unknown src addr we
4483                  * need to look inside to find the association
4484                  */
4485                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4486                         struct sctp_chunkhdr *asconf_ch = ch;
4487                         uint32_t asconf_offset = 0, asconf_len = 0;
4488
4489                         /* inp's refcount may be reduced */
4490                         SCTP_INP_INCR_REF(inp);
4491
4492                         asconf_offset = *offset;
4493                         do {
4494                                 asconf_len = ntohs(asconf_ch->chunk_length);
4495                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4496                                         break;
4497                                 stcb = sctp_findassociation_ep_asconf(m,
4498                                     *offset,
4499                                     dst,
4500                                     sh, &inp, netp, vrf_id);
4501                                 if (stcb != NULL)
4502                                         break;
4503                                 asconf_offset += SCTP_SIZE32(asconf_len);
4504                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4505                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4506                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4507                         if (stcb == NULL) {
4508                                 /*
4509                                  * reduce inp's refcount if not reduced in
4510                                  * sctp_findassociation_ep_asconf().
4511                                  */
4512                                 SCTP_INP_DECR_REF(inp);
4513                         } else {
4514                                 locked_tcb = stcb;
4515                         }
4516
4517                         /* now go back and verify any auth chunk to be sure */
4518                         if (auth_skipped && (stcb != NULL)) {
4519                                 struct sctp_auth_chunk *auth;
4520
4521                                 auth = (struct sctp_auth_chunk *)
4522                                     sctp_m_getptr(m, auth_offset,
4523                                     auth_len, chunk_buf);
4524                                 got_auth = 1;
4525                                 auth_skipped = 0;
4526                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4527                                     auth_offset)) {
4528                                         /* auth HMAC failed so dump it */
4529                                         *offset = length;
4530                                         if (locked_tcb) {
4531                                                 SCTP_TCB_UNLOCK(locked_tcb);
4532                                         }
4533                                         return (NULL);
4534                                 } else {
4535                                         /* remaining chunks are HMAC checked */
4536                                         stcb->asoc.authenticated = 1;
4537                                 }
4538                         }
4539                 }
4540                 if (stcb == NULL) {
4541                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4542                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4543                             msg);
4544                         /* no association, so it's out of the blue... */
4545                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4546                             mflowtype, mflowid,
4547                             vrf_id, port);
4548                         *offset = length;
4549                         if (locked_tcb) {
4550                                 SCTP_TCB_UNLOCK(locked_tcb);
4551                         }
4552                         return (NULL);
4553                 }
4554                 asoc = &stcb->asoc;
4555                 /* ABORT and SHUTDOWN can use either v_tag... */
4556                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4557                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4558                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4559                         /* Take the T-bit always into account. */
4560                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4561                             (vtag_in == asoc->my_vtag)) ||
4562                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4563                             (vtag_in == asoc->peer_vtag))) {
4564                                 /* this is valid */
4565                         } else {
4566                                 /* drop this packet... */
4567                                 SCTP_STAT_INCR(sctps_badvtag);
4568                                 if (locked_tcb) {
4569                                         SCTP_TCB_UNLOCK(locked_tcb);
4570                                 }
4571                                 return (NULL);
4572                         }
4573                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4574                         if (vtag_in != asoc->my_vtag) {
4575                                 /*
4576                                  * this could be a stale SHUTDOWN-ACK or the
4577                                  * peer never got the SHUTDOWN-COMPLETE and
4578                                  * is still hung; we have started a new asoc
4579                                  * but it won't complete until the shutdown
4580                                  * is completed
4581                                  */
4582                                 if (locked_tcb) {
4583                                         SCTP_TCB_UNLOCK(locked_tcb);
4584                                 }
4585                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4586                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4587                                     msg);
4588                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4589                                     sh, inp, op_err,
4590                                     mflowtype, mflowid,
4591                                     vrf_id, port);
4592                                 return (NULL);
4593                         }
4594                 } else {
4595                         /* for all other chunks, vtag must match */
4596                         if (vtag_in != asoc->my_vtag) {
4597                                 /* invalid vtag... */
4598                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4599                                     "invalid vtag: %xh, expect %xh\n",
4600                                     vtag_in, asoc->my_vtag);
4601                                 SCTP_STAT_INCR(sctps_badvtag);
4602                                 if (locked_tcb) {
4603                                         SCTP_TCB_UNLOCK(locked_tcb);
4604                                 }
4605                                 *offset = length;
4606                                 return (NULL);
4607                         }
4608                 }
4609         }                       /* end if !SCTP_COOKIE_ECHO */
4610         /*
4611          * process all control chunks...
4612          */
4613         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4614             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4615             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4616             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4617                 /* implied cookie-ack.. we must have lost the ack */
4618                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4619                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4620                             stcb->asoc.overall_error_count,
4621                             0,
4622                             SCTP_FROM_SCTP_INPUT,
4623                             __LINE__);
4624                 }
4625                 stcb->asoc.overall_error_count = 0;
4626                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4627                     *netp);
4628         }
4629 process_control_chunks:
4630         while (IS_SCTP_CONTROL(ch)) {
4631                 /* validate chunk length */
4632                 chk_length = ntohs(ch->chunk_length);
4633                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4634                     ch->chunk_type, chk_length);
4635                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4636                 if (chk_length < sizeof(*ch) ||
4637                     (*offset + (int)chk_length) > length) {
4638                         *offset = length;
4639                         if (locked_tcb) {
4640                                 SCTP_TCB_UNLOCK(locked_tcb);
4641                         }
4642                         return (NULL);
4643                 }
4644                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4645                 /*
4646                  * INIT-ACK only gets the init ack "header" portion only
4647                  * because we don't have to process the peer's COOKIE. All
4648                  * others get a complete chunk.
4649                  */
4650                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4651                     (ch->chunk_type == SCTP_INITIATION)) {
4652                         /* get an init-ack chunk */
4653                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4654                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4655                         if (ch == NULL) {
4656                                 *offset = length;
4657                                 if (locked_tcb) {
4658                                         SCTP_TCB_UNLOCK(locked_tcb);
4659                                 }
4660                                 return (NULL);
4661                         }
4662                 } else {
4663                         /* For cookies and all other chunks. */
4664                         if (chk_length > sizeof(chunk_buf)) {
4665                                 /*
4666                                  * use just the size of the chunk buffer so
4667                                  * the front part of our chunks fit in
4668                                  * contiguous space up to the chunk buffer
4669                                  * size (508 bytes). For chunks that need to
4670                                  * get more than that they must use the
4671                                  * sctp_m_getptr() function or other means
4672                                  * (e.g. know how to parse mbuf chains).
4673                                  * Cookies do this already.
4674                                  */
4675                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4676                                     (sizeof(chunk_buf) - 4),
4677                                     chunk_buf);
4678                                 if (ch == NULL) {
4679                                         *offset = length;
4680                                         if (locked_tcb) {
4681                                                 SCTP_TCB_UNLOCK(locked_tcb);
4682                                         }
4683                                         return (NULL);
4684                                 }
4685                         } else {
4686                                 /* We can fit it all */
4687                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4688                                     chk_length, chunk_buf);
4689                                 if (ch == NULL) {
4690                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4691                                         *offset = length;
4692                                         if (locked_tcb) {
4693                                                 SCTP_TCB_UNLOCK(locked_tcb);
4694                                         }
4695                                         return (NULL);
4696                                 }
4697                         }
4698                 }
4699                 num_chunks++;
4700                 /* Save off the last place we got a control from */
4701                 if (stcb != NULL) {
4702                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4703                                 /*
4704                                  * allow last_control to be NULL if
4705                                  * ASCONF... ASCONF processing will find the
4706                                  * right net later
4707                                  */
4708                                 if ((netp != NULL) && (*netp != NULL))
4709                                         stcb->asoc.last_control_chunk_from = *netp;
4710                         }
4711                 }
4712 #ifdef SCTP_AUDITING_ENABLED
4713                 sctp_audit_log(0xB0, ch->chunk_type);
4714 #endif
4715
4716                 /* check to see if this chunk required auth, but isn't */
4717                 if ((stcb != NULL) &&
4718                     (stcb->asoc.auth_supported == 1) &&
4719                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4720                     !stcb->asoc.authenticated) {
4721                         /* "silently" ignore */
4722                         SCTP_STAT_INCR(sctps_recvauthmissing);
4723                         goto next_chunk;
4724                 }
4725                 switch (ch->chunk_type) {
4726                 case SCTP_INITIATION:
4727                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4728                         /* The INIT chunk must be the only chunk. */
4729                         if ((num_chunks > 1) ||
4730                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4731                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4732                                     "INIT not the only chunk");
4733                                 sctp_abort_association(inp, stcb, m, iphlen,
4734                                     src, dst, sh, op_err,
4735                                     mflowtype, mflowid,
4736                                     vrf_id, port);
4737                                 *offset = length;
4738                                 return (NULL);
4739                         }
4740                         /* Honor our resource limit. */
4741                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4742                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4743                                 sctp_abort_association(inp, stcb, m, iphlen,
4744                                     src, dst, sh, op_err,
4745                                     mflowtype, mflowid,
4746                                     vrf_id, port);
4747                                 *offset = length;
4748                                 return (NULL);
4749                         }
4750                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4751                             (struct sctp_init_chunk *)ch, inp,
4752                             stcb, &abort_no_unlock,
4753                             mflowtype, mflowid,
4754                             vrf_id, port);
4755                         *offset = length;
4756                         if ((!abort_no_unlock) && (locked_tcb)) {
4757                                 SCTP_TCB_UNLOCK(locked_tcb);
4758                         }
4759                         return (NULL);
4760                         break;
4761                 case SCTP_PAD_CHUNK:
4762                         break;
4763                 case SCTP_INITIATION_ACK:
4764                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4765                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4766                                 /* We are not interested anymore */
4767                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4768                                         ;
4769                                 } else {
4770                                         if (locked_tcb != stcb) {
4771                                                 /* Very unlikely */
4772                                                 SCTP_TCB_UNLOCK(locked_tcb);
4773                                         }
4774                                         *offset = length;
4775                                         if (stcb) {
4776 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4777                                                 so = SCTP_INP_SO(inp);
4778                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4779                                                 SCTP_TCB_UNLOCK(stcb);
4780                                                 SCTP_SOCKET_LOCK(so, 1);
4781                                                 SCTP_TCB_LOCK(stcb);
4782                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4783 #endif
4784                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
4785 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4786                                                 SCTP_SOCKET_UNLOCK(so, 1);
4787 #endif
4788                                         }
4789                                         return (NULL);
4790                                 }
4791                         }
4792                         /* The INIT-ACK chunk must be the only chunk. */
4793                         if ((num_chunks > 1) ||
4794                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4795                                 *offset = length;
4796                                 if (locked_tcb) {
4797                                         SCTP_TCB_UNLOCK(locked_tcb);
4798                                 }
4799                                 return (NULL);
4800                         }
4801                         if ((netp) && (*netp)) {
4802                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4803                                     src, dst, sh,
4804                                     (struct sctp_init_ack_chunk *)ch,
4805                                     stcb, *netp,
4806                                     &abort_no_unlock,
4807                                     mflowtype, mflowid,
4808                                     vrf_id);
4809                         } else {
4810                                 ret = -1;
4811                         }
4812                         *offset = length;
4813                         if (abort_no_unlock) {
4814                                 return (NULL);
4815                         }
4816                         /*
4817                          * Special case, I must call the output routine to
4818                          * get the cookie echoed
4819                          */
4820                         if ((stcb != NULL) && (ret == 0)) {
4821                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4822                         }
4823                         if (locked_tcb) {
4824                                 SCTP_TCB_UNLOCK(locked_tcb);
4825                         }
4826                         return (NULL);
4827                         break;
4828                 case SCTP_SELECTIVE_ACK:
4829                         {
4830                                 struct sctp_sack_chunk *sack;
4831                                 int abort_now = 0;
4832                                 uint32_t a_rwnd, cum_ack;
4833                                 uint16_t num_seg, num_dup;
4834                                 uint8_t flags;
4835                                 int offset_seg, offset_dup;
4836
4837                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4838                                 SCTP_STAT_INCR(sctps_recvsacks);
4839                                 if (stcb == NULL) {
4840                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4841                                         break;
4842                                 }
4843                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4844                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4845                                         break;
4846                                 }
4847                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4848                                         /*-
4849                                          * If we have sent a shutdown-ack, we will pay no
4850                                          * attention to a sack sent in to us since
4851                                          * we don't care anymore.
4852                                          */
4853                                         break;
4854                                 }
4855                                 sack = (struct sctp_sack_chunk *)ch;
4856                                 flags = ch->chunk_flags;
4857                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4858                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4859                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4860                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4861                                 if (sizeof(struct sctp_sack_chunk) +
4862                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4863                                     num_dup * sizeof(uint32_t) != chk_length) {
4864                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4865                                         break;
4866                                 }
4867                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4868                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4869                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4870                                     cum_ack, num_seg, a_rwnd);
4871                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4872                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4873                                     (num_seg == 0) &&
4874                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4875                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4876                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4877                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
4878                                     ) {
4879                                         /*
4880                                          * We have a SIMPLE sack having no
4881                                          * prior segments and data on sent
4882                                          * queue to be acked.. Use the
4883                                          * faster path sack processing. We
4884                                          * also allow window update sacks
4885                                          * with no missing segments to go
4886                                          * this way too.
4887                                          */
4888                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
4889                                 } else {
4890                                         if (netp && *netp)
4891                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4892                                                     num_seg, 0, num_dup, &abort_now, flags,
4893                                                     cum_ack, a_rwnd, ecne_seen);
4894                                 }
4895                                 if (abort_now) {
4896                                         /* ABORT signal from sack processing */
4897                                         *offset = length;
4898                                         return (NULL);
4899                                 }
4900                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4901                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4902                                     (stcb->asoc.stream_queue_cnt == 0)) {
4903                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4904                                 }
4905                         }
4906                         break;
4907                         /*
4908                          * EY - nr_sack:  If the received chunk is an
4909                          * nr_sack chunk
4910                          */
4911                 case SCTP_NR_SELECTIVE_ACK:
4912                         {
4913                                 struct sctp_nr_sack_chunk *nr_sack;
4914                                 int abort_now = 0;
4915                                 uint32_t a_rwnd, cum_ack;
4916                                 uint16_t num_seg, num_nr_seg, num_dup;
4917                                 uint8_t flags;
4918                                 int offset_seg, offset_dup;
4919
4920                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
4921                                 SCTP_STAT_INCR(sctps_recvsacks);
4922                                 if (stcb == NULL) {
4923                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
4924                                         break;
4925                                 }
4926                                 if (stcb->asoc.nrsack_supported == 0) {
4927                                         goto unknown_chunk;
4928                                 }
4929                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4930                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
4931                                         break;
4932                                 }
4933                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4934                                         /*-
4935                                          * If we have sent a shutdown-ack, we will pay no
4936                                          * attention to a sack sent in to us since
4937                                          * we don't care anymore.
4938                                          */
4939                                         break;
4940                                 }
4941                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
4942                                 flags = ch->chunk_flags;
4943                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4944                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4945                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4946                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4947                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
4948                                 if (sizeof(struct sctp_nr_sack_chunk) +
4949                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4950                                     num_dup * sizeof(uint32_t) != chk_length) {
4951                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4952                                         break;
4953                                 }
4954                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4955                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4956                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4957                                     cum_ack, num_seg, a_rwnd);
4958                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4959                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4960                                     (num_seg == 0) && (num_nr_seg == 0) &&
4961                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
4962                                     (stcb->asoc.saw_sack_with_frags == 0) &&
4963                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
4964                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
4965                                         /*
4966                                          * We have a SIMPLE sack having no
4967                                          * prior segments and data on sent
4968                                          * queue to be acked. Use the faster
4969                                          * path sack processing. We also
4970                                          * allow window update sacks with no
4971                                          * missing segments to go this way
4972                                          * too.
4973                                          */
4974                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
4975                                             &abort_now, ecne_seen);
4976                                 } else {
4977                                         if (netp && *netp)
4978                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
4979                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
4980                                                     cum_ack, a_rwnd, ecne_seen);
4981                                 }
4982                                 if (abort_now) {
4983                                         /* ABORT signal from sack processing */
4984                                         *offset = length;
4985                                         return (NULL);
4986                                 }
4987                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
4988                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
4989                                     (stcb->asoc.stream_queue_cnt == 0)) {
4990                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
4991                                 }
4992                         }
4993                         break;
4994
4995                 case SCTP_HEARTBEAT_REQUEST:
4996                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
4997                         if ((stcb) && netp && *netp) {
4998                                 SCTP_STAT_INCR(sctps_recvheartbeat);
4999                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5000                                     chk_length, *netp);
5001
5002                                 /* He's alive so give him credit */
5003                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5004                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5005                                             stcb->asoc.overall_error_count,
5006                                             0,
5007                                             SCTP_FROM_SCTP_INPUT,
5008                                             __LINE__);
5009                                 }
5010                                 stcb->asoc.overall_error_count = 0;
5011                         }
5012                         break;
5013                 case SCTP_HEARTBEAT_ACK:
5014                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5015                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5016                                 /* Its not ours */
5017                                 *offset = length;
5018                                 if (locked_tcb) {
5019                                         SCTP_TCB_UNLOCK(locked_tcb);
5020                                 }
5021                                 return (NULL);
5022                         }
5023                         /* He's alive so give him credit */
5024                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5025                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5026                                     stcb->asoc.overall_error_count,
5027                                     0,
5028                                     SCTP_FROM_SCTP_INPUT,
5029                                     __LINE__);
5030                         }
5031                         stcb->asoc.overall_error_count = 0;
5032                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5033                         if (netp && *netp)
5034                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5035                                     stcb, *netp);
5036                         break;
5037                 case SCTP_ABORT_ASSOCIATION:
5038                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5039                             (void *)stcb);
5040                         if ((stcb) && netp && *netp)
5041                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5042                                     stcb, *netp);
5043                         *offset = length;
5044                         return (NULL);
5045                         break;
5046                 case SCTP_SHUTDOWN:
5047                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5048                             (void *)stcb);
5049                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5050                                 *offset = length;
5051                                 if (locked_tcb) {
5052                                         SCTP_TCB_UNLOCK(locked_tcb);
5053                                 }
5054                                 return (NULL);
5055                         }
5056                         if (netp && *netp) {
5057                                 int abort_flag = 0;
5058
5059                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5060                                     stcb, *netp, &abort_flag);
5061                                 if (abort_flag) {
5062                                         *offset = length;
5063                                         return (NULL);
5064                                 }
5065                         }
5066                         break;
5067                 case SCTP_SHUTDOWN_ACK:
5068                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5069                         if ((stcb) && (netp) && (*netp))
5070                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5071                         *offset = length;
5072                         return (NULL);
5073                         break;
5074
5075                 case SCTP_OPERATION_ERROR:
5076                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5077                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5078                                 *offset = length;
5079                                 return (NULL);
5080                         }
5081                         break;
5082                 case SCTP_COOKIE_ECHO:
5083                         SCTPDBG(SCTP_DEBUG_INPUT3,
5084                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5085                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5086                                 ;
5087                         } else {
5088                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5089                                         /* We are not interested anymore */
5090                         abend:
5091                                         if (stcb) {
5092                                                 SCTP_TCB_UNLOCK(stcb);
5093                                         }
5094                                         *offset = length;
5095                                         return (NULL);
5096                                 }
5097                         }
5098                         /*
5099                          * First are we accepting? We do this again here
5100                          * since it is possible that a previous endpoint WAS
5101                          * listening responded to a INIT-ACK and then
5102                          * closed. We opened and bound.. and are now no
5103                          * longer listening.
5104                          */
5105
5106                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5107                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5108                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5109                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5110                                         sctp_abort_association(inp, stcb, m, iphlen,
5111                                             src, dst, sh, op_err,
5112                                             mflowtype, mflowid,
5113                                             vrf_id, port);
5114                                 }
5115                                 *offset = length;
5116                                 return (NULL);
5117                         } else {
5118                                 struct mbuf *ret_buf;
5119                                 struct sctp_inpcb *linp;
5120
5121                                 if (stcb) {
5122                                         linp = NULL;
5123                                 } else {
5124                                         linp = inp;
5125                                 }
5126
5127                                 if (linp) {
5128                                         SCTP_ASOC_CREATE_LOCK(linp);
5129                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5130                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5131                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5132                                                 goto abend;
5133                                         }
5134                                 }
5135                                 if (netp) {
5136                                         ret_buf =
5137                                             sctp_handle_cookie_echo(m, iphlen,
5138                                             *offset,
5139                                             src, dst,
5140                                             sh,
5141                                             (struct sctp_cookie_echo_chunk *)ch,
5142                                             &inp, &stcb, netp,
5143                                             auth_skipped,
5144                                             auth_offset,
5145                                             auth_len,
5146                                             &locked_tcb,
5147                                             mflowtype,
5148                                             mflowid,
5149                                             vrf_id,
5150                                             port);
5151                                 } else {
5152                                         ret_buf = NULL;
5153                                 }
5154                                 if (linp) {
5155                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5156                                 }
5157                                 if (ret_buf == NULL) {
5158                                         if (locked_tcb) {
5159                                                 SCTP_TCB_UNLOCK(locked_tcb);
5160                                         }
5161                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5162                                             "GAK, null buffer\n");
5163                                         *offset = length;
5164                                         return (NULL);
5165                                 }
5166                                 /* if AUTH skipped, see if it verified... */
5167                                 if (auth_skipped) {
5168                                         got_auth = 1;
5169                                         auth_skipped = 0;
5170                                 }
5171                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5172                                         /*
5173                                          * Restart the timer if we have
5174                                          * pending data
5175                                          */
5176                                         struct sctp_tmit_chunk *chk;
5177
5178                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5179                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5180                                 }
5181                         }
5182                         break;
5183                 case SCTP_COOKIE_ACK:
5184                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5185                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5186                                 if (locked_tcb) {
5187                                         SCTP_TCB_UNLOCK(locked_tcb);
5188                                 }
5189                                 return (NULL);
5190                         }
5191                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5192                                 /* We are not interested anymore */
5193                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5194                                         ;
5195                                 } else if (stcb) {
5196 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5197                                         so = SCTP_INP_SO(inp);
5198                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5199                                         SCTP_TCB_UNLOCK(stcb);
5200                                         SCTP_SOCKET_LOCK(so, 1);
5201                                         SCTP_TCB_LOCK(stcb);
5202                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5203 #endif
5204                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
5205 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5206                                         SCTP_SOCKET_UNLOCK(so, 1);
5207 #endif
5208                                         *offset = length;
5209                                         return (NULL);
5210                                 }
5211                         }
5212                         /* He's alive so give him credit */
5213                         if ((stcb) && netp && *netp) {
5214                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5215                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5216                                             stcb->asoc.overall_error_count,
5217                                             0,
5218                                             SCTP_FROM_SCTP_INPUT,
5219                                             __LINE__);
5220                                 }
5221                                 stcb->asoc.overall_error_count = 0;
5222                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5223                         }
5224                         break;
5225                 case SCTP_ECN_ECHO:
5226                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5227                         /* He's alive so give him credit */
5228                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5229                                 /* Its not ours */
5230                                 if (locked_tcb) {
5231                                         SCTP_TCB_UNLOCK(locked_tcb);
5232                                 }
5233                                 *offset = length;
5234                                 return (NULL);
5235                         }
5236                         if (stcb) {
5237                                 if (stcb->asoc.ecn_supported == 0) {
5238                                         goto unknown_chunk;
5239                                 }
5240                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5241                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5242                                             stcb->asoc.overall_error_count,
5243                                             0,
5244                                             SCTP_FROM_SCTP_INPUT,
5245                                             __LINE__);
5246                                 }
5247                                 stcb->asoc.overall_error_count = 0;
5248                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5249                                     stcb);
5250                                 ecne_seen = 1;
5251                         }
5252                         break;
5253                 case SCTP_ECN_CWR:
5254                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5255                         /* He's alive so give him credit */
5256                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5257                                 /* Its not ours */
5258                                 if (locked_tcb) {
5259                                         SCTP_TCB_UNLOCK(locked_tcb);
5260                                 }
5261                                 *offset = length;
5262                                 return (NULL);
5263                         }
5264                         if (stcb) {
5265                                 if (stcb->asoc.ecn_supported == 0) {
5266                                         goto unknown_chunk;
5267                                 }
5268                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5269                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5270                                             stcb->asoc.overall_error_count,
5271                                             0,
5272                                             SCTP_FROM_SCTP_INPUT,
5273                                             __LINE__);
5274                                 }
5275                                 stcb->asoc.overall_error_count = 0;
5276                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5277                         }
5278                         break;
5279                 case SCTP_SHUTDOWN_COMPLETE:
5280                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5281                         /* must be first and only chunk */
5282                         if ((num_chunks > 1) ||
5283                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5284                                 *offset = length;
5285                                 if (locked_tcb) {
5286                                         SCTP_TCB_UNLOCK(locked_tcb);
5287                                 }
5288                                 return (NULL);
5289                         }
5290                         if ((stcb) && netp && *netp) {
5291                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5292                                     stcb, *netp);
5293                         }
5294                         *offset = length;
5295                         return (NULL);
5296                         break;
5297                 case SCTP_ASCONF:
5298                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5299                         /* He's alive so give him credit */
5300                         if (stcb) {
5301                                 if (stcb->asoc.asconf_supported == 0) {
5302                                         goto unknown_chunk;
5303                                 }
5304                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5305                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5306                                             stcb->asoc.overall_error_count,
5307                                             0,
5308                                             SCTP_FROM_SCTP_INPUT,
5309                                             __LINE__);
5310                                 }
5311                                 stcb->asoc.overall_error_count = 0;
5312                                 sctp_handle_asconf(m, *offset, src,
5313                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5314                                 asconf_cnt++;
5315                         }
5316                         break;
5317                 case SCTP_ASCONF_ACK:
5318                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5319                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5320                                 /* Its not ours */
5321                                 if (locked_tcb) {
5322                                         SCTP_TCB_UNLOCK(locked_tcb);
5323                                 }
5324                                 *offset = length;
5325                                 return (NULL);
5326                         }
5327                         if ((stcb) && netp && *netp) {
5328                                 if (stcb->asoc.asconf_supported == 0) {
5329                                         goto unknown_chunk;
5330                                 }
5331                                 /* He's alive so give him credit */
5332                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5333                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5334                                             stcb->asoc.overall_error_count,
5335                                             0,
5336                                             SCTP_FROM_SCTP_INPUT,
5337                                             __LINE__);
5338                                 }
5339                                 stcb->asoc.overall_error_count = 0;
5340                                 sctp_handle_asconf_ack(m, *offset,
5341                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5342                                 if (abort_no_unlock)
5343                                         return (NULL);
5344                         }
5345                         break;
5346                 case SCTP_FORWARD_CUM_TSN:
5347                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5348                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5349                                 /* Its not ours */
5350                                 if (locked_tcb) {
5351                                         SCTP_TCB_UNLOCK(locked_tcb);
5352                                 }
5353                                 *offset = length;
5354                                 return (NULL);
5355                         }
5356                         /* He's alive so give him credit */
5357                         if (stcb) {
5358                                 int abort_flag = 0;
5359
5360                                 if (stcb->asoc.prsctp_supported == 0) {
5361                                         goto unknown_chunk;
5362                                 }
5363                                 stcb->asoc.overall_error_count = 0;
5364                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5365                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5366                                             stcb->asoc.overall_error_count,
5367                                             0,
5368                                             SCTP_FROM_SCTP_INPUT,
5369                                             __LINE__);
5370                                 }
5371                                 *fwd_tsn_seen = 1;
5372                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5373                                         /* We are not interested anymore */
5374 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5375                                         so = SCTP_INP_SO(inp);
5376                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5377                                         SCTP_TCB_UNLOCK(stcb);
5378                                         SCTP_SOCKET_LOCK(so, 1);
5379                                         SCTP_TCB_LOCK(stcb);
5380                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5381 #endif
5382                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5383 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5384                                         SCTP_SOCKET_UNLOCK(so, 1);
5385 #endif
5386                                         *offset = length;
5387                                         return (NULL);
5388                                 }
5389                                 sctp_handle_forward_tsn(stcb,
5390                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5391                                 if (abort_flag) {
5392                                         *offset = length;
5393                                         return (NULL);
5394                                 } else {
5395                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5396                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5397                                                     stcb->asoc.overall_error_count,
5398                                                     0,
5399                                                     SCTP_FROM_SCTP_INPUT,
5400                                                     __LINE__);
5401                                         }
5402                                         stcb->asoc.overall_error_count = 0;
5403                                 }
5404
5405                         }
5406                         break;
5407                 case SCTP_STREAM_RESET:
5408                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5409                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5410                                 /* Its not ours */
5411                                 if (locked_tcb) {
5412                                         SCTP_TCB_UNLOCK(locked_tcb);
5413                                 }
5414                                 *offset = length;
5415                                 return (NULL);
5416                         }
5417                         if (stcb->asoc.reconfig_supported == 0) {
5418                                 goto unknown_chunk;
5419                         }
5420                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5421                                 /* stop processing */
5422                                 *offset = length;
5423                                 return (NULL);
5424                         }
5425                         break;
5426                 case SCTP_PACKET_DROPPED:
5427                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5428                         /* re-get it all please */
5429                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5430                                 /* Its not ours */
5431                                 if (locked_tcb) {
5432                                         SCTP_TCB_UNLOCK(locked_tcb);
5433                                 }
5434                                 *offset = length;
5435                                 return (NULL);
5436                         }
5437                         if (ch && (stcb) && netp && (*netp)) {
5438                                 if (stcb->asoc.pktdrop_supported == 0) {
5439                                         goto unknown_chunk;
5440                                 }
5441                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5442                                     stcb, *netp,
5443                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5444
5445                         }
5446                         break;
5447                 case SCTP_AUTHENTICATION:
5448                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5449                         if (stcb == NULL) {
5450                                 /* save the first AUTH for later processing */
5451                                 if (auth_skipped == 0) {
5452                                         auth_offset = *offset;
5453                                         auth_len = chk_length;
5454                                         auth_skipped = 1;
5455                                 }
5456                                 /* skip this chunk (temporarily) */
5457                                 goto next_chunk;
5458                         }
5459                         if (stcb->asoc.auth_supported == 0) {
5460                                 goto unknown_chunk;
5461                         }
5462                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5463                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5464                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5465                                 /* Its not ours */
5466                                 if (locked_tcb) {
5467                                         SCTP_TCB_UNLOCK(locked_tcb);
5468                                 }
5469                                 *offset = length;
5470                                 return (NULL);
5471                         }
5472                         if (got_auth == 1) {
5473                                 /* skip this chunk... it's already auth'd */
5474                                 goto next_chunk;
5475                         }
5476                         got_auth = 1;
5477                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5478                             m, *offset)) {
5479                                 /* auth HMAC failed so dump the packet */
5480                                 *offset = length;
5481                                 return (stcb);
5482                         } else {
5483                                 /* remaining chunks are HMAC checked */
5484                                 stcb->asoc.authenticated = 1;
5485                         }
5486                         break;
5487
5488                 default:
5489         unknown_chunk:
5490                         /* it's an unknown chunk! */
5491                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5492                                 struct mbuf *mm;
5493                                 struct sctp_paramhdr *phd;
5494                                 int len;
5495
5496                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5497                                     0, M_NOWAIT, 1, MT_DATA);
5498                                 if (mm) {
5499                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5500                                         phd = mtod(mm, struct sctp_paramhdr *);
5501                                         /*
5502                                          * We cheat and use param type since
5503                                          * we did not bother to define a
5504                                          * error cause struct. They are the
5505                                          * same basic format with different
5506                                          * names.
5507                                          */
5508                                         phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5509                                         phd->param_length = htons(len + sizeof(*phd));
5510                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5511                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5512                                         if (SCTP_BUF_NEXT(mm)) {
5513                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) {
5514                                                         sctp_m_freem(mm);
5515                                                 } else {
5516 #ifdef SCTP_MBUF_LOGGING
5517                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5518                                                                 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY);
5519                                                         }
5520 #endif
5521                                                         sctp_queue_op_err(stcb, mm);
5522                                                 }
5523                                         } else {
5524                                                 sctp_m_freem(mm);
5525                                         }
5526                                 }
5527                         }
5528                         if ((ch->chunk_type & 0x80) == 0) {
5529                                 /* discard this packet */
5530                                 *offset = length;
5531                                 return (stcb);
5532                         }       /* else skip this bad chunk and continue... */
5533                         break;
5534                 }               /* switch (ch->chunk_type) */
5535
5536
5537 next_chunk:
5538                 /* get the next chunk */
5539                 *offset += SCTP_SIZE32(chk_length);
5540                 if (*offset >= length) {
5541                         /* no more data left in the mbuf chain */
5542                         break;
5543                 }
5544                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5545                     sizeof(struct sctp_chunkhdr), chunk_buf);
5546                 if (ch == NULL) {
5547                         if (locked_tcb) {
5548                                 SCTP_TCB_UNLOCK(locked_tcb);
5549                         }
5550                         *offset = length;
5551                         return (NULL);
5552                 }
5553         }                       /* while */
5554
5555         if (asconf_cnt > 0 && stcb != NULL) {
5556                 sctp_send_asconf_ack(stcb);
5557         }
5558         return (stcb);
5559 }
5560
5561
5562 #ifdef INVARIANTS
5563 #ifdef __GNUC__
5564 __attribute__((noinline))
5565 #endif
5566         void
5567              sctp_validate_no_locks(struct sctp_inpcb *inp)
5568 {
5569         struct sctp_tcb *lstcb;
5570
5571         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5572                 if (mtx_owned(&lstcb->tcb_mtx)) {
5573                         panic("Own lock on stcb at return from input");
5574                 }
5575         }
5576         if (mtx_owned(&inp->inp_create_mtx)) {
5577                 panic("Own create lock on inp");
5578         }
5579         if (mtx_owned(&inp->inp_mtx)) {
5580                 panic("Own inp lock on inp");
5581         }
5582 }
5583
5584 #endif
5585
5586 /*
5587  * common input chunk processing (v4 and v6)
5588  */
5589 void
5590 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5591     struct sockaddr *src, struct sockaddr *dst,
5592     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5593 #if !defined(SCTP_WITH_NO_CSUM)
5594     uint8_t compute_crc,
5595 #endif
5596     uint8_t ecn_bits,
5597     uint8_t mflowtype, uint32_t mflowid,
5598     uint32_t vrf_id, uint16_t port)
5599 {
5600         uint32_t high_tsn;
5601         int fwd_tsn_seen = 0, data_processed = 0;
5602         struct mbuf *m = *mm, *op_err;
5603         char msg[SCTP_DIAG_INFO_LEN];
5604         int un_sent;
5605         int cnt_ctrl_ready = 0;
5606         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5607         struct sctp_tcb *stcb = NULL;
5608         struct sctp_nets *net = NULL;
5609
5610         SCTP_STAT_INCR(sctps_recvdatagrams);
5611 #ifdef SCTP_AUDITING_ENABLED
5612         sctp_audit_log(0xE0, 1);
5613         sctp_auditing(0, inp, stcb, net);
5614 #endif
5615 #if !defined(SCTP_WITH_NO_CSUM)
5616         if (compute_crc != 0) {
5617                 uint32_t check, calc_check;
5618
5619                 check = sh->checksum;
5620                 sh->checksum = 0;
5621                 calc_check = sctp_calculate_cksum(m, iphlen);
5622                 sh->checksum = check;
5623                 if (calc_check != check) {
5624                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5625                             calc_check, check, (void *)m, length, iphlen);
5626                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5627                             sh, ch, &inp, &net, vrf_id);
5628 #if defined(INET) || defined(INET6)
5629                         if ((net != NULL) && (port != 0)) {
5630                                 if (net->port == 0) {
5631                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5632                                 }
5633                                 net->port = port;
5634                         }
5635 #endif
5636                         if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
5637                                 net->flowtype = mflowtype;
5638                         }
5639                         if ((inp != NULL) && (stcb != NULL)) {
5640                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5641                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5642                         } else if ((inp != NULL) && (stcb == NULL)) {
5643                                 inp_decr = inp;
5644                         }
5645                         SCTP_STAT_INCR(sctps_badsum);
5646                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5647                         goto out;
5648                 }
5649         }
5650 #endif
5651         /* Destination port of 0 is illegal, based on RFC4960. */
5652         if (sh->dest_port == 0) {
5653                 SCTP_STAT_INCR(sctps_hdrops);
5654                 goto out;
5655         }
5656         stcb = sctp_findassociation_addr(m, offset, src, dst,
5657             sh, ch, &inp, &net, vrf_id);
5658 #if defined(INET) || defined(INET6)
5659         if ((net != NULL) && (port != 0)) {
5660                 if (net->port == 0) {
5661                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5662                 }
5663                 net->port = port;
5664         }
5665 #endif
5666         if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) {
5667                 net->flowtype = mflowtype;
5668         }
5669         if (inp == NULL) {
5670                 SCTP_STAT_INCR(sctps_noport);
5671                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5672                         goto out;
5673                 }
5674                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5675                         sctp_send_shutdown_complete2(src, dst, sh,
5676                             mflowtype, mflowid,
5677                             vrf_id, port);
5678                         goto out;
5679                 }
5680                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5681                         goto out;
5682                 }
5683                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5684                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5685                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5686                             (ch->chunk_type != SCTP_INIT))) {
5687                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5688                                     "Out of the blue");
5689                                 sctp_send_abort(m, iphlen, src, dst,
5690                                     sh, 0, op_err,
5691                                     mflowtype, mflowid,
5692                                     vrf_id, port);
5693                         }
5694                 }
5695                 goto out;
5696         } else if (stcb == NULL) {
5697                 inp_decr = inp;
5698         }
5699 #ifdef IPSEC
5700         /*-
5701          * I very much doubt any of the IPSEC stuff will work but I have no
5702          * idea, so I will leave it in place.
5703          */
5704         if (inp != NULL) {
5705                 switch (dst->sa_family) {
5706 #ifdef INET
5707                 case AF_INET:
5708                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5709                                 IPSECSTAT_INC(ips_in_polvio);
5710                                 SCTP_STAT_INCR(sctps_hdrops);
5711                                 goto out;
5712                         }
5713                         break;
5714 #endif
5715 #ifdef INET6
5716                 case AF_INET6:
5717                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5718                                 IPSEC6STAT_INC(ips_in_polvio);
5719                                 SCTP_STAT_INCR(sctps_hdrops);
5720                                 goto out;
5721                         }
5722                         break;
5723 #endif
5724                 default:
5725                         break;
5726                 }
5727         }
5728 #endif
5729         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5730             (void *)m, iphlen, offset, length, (void *)stcb);
5731         if (stcb) {
5732                 /* always clear this before beginning a packet */
5733                 stcb->asoc.authenticated = 0;
5734                 stcb->asoc.seen_a_sack_this_pkt = 0;
5735                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5736                     (void *)stcb, stcb->asoc.state);
5737
5738                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5739                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5740                         /*-
5741                          * If we hit here, we had a ref count
5742                          * up when the assoc was aborted and the
5743                          * timer is clearing out the assoc, we should
5744                          * NOT respond to any packet.. its OOTB.
5745                          */
5746                         SCTP_TCB_UNLOCK(stcb);
5747                         stcb = NULL;
5748                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5749                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5750                             msg);
5751                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5752                             mflowtype, mflowid,
5753                             vrf_id, port);
5754                         goto out;
5755                 }
5756         }
5757         if (IS_SCTP_CONTROL(ch)) {
5758                 /* process the control portion of the SCTP packet */
5759                 /* sa_ignore NO_NULL_CHK */
5760                 stcb = sctp_process_control(m, iphlen, &offset, length,
5761                     src, dst, sh, ch,
5762                     inp, stcb, &net, &fwd_tsn_seen,
5763                     mflowtype, mflowid,
5764                     vrf_id, port);
5765                 if (stcb) {
5766                         /*
5767                          * This covers us if the cookie-echo was there and
5768                          * it changes our INP.
5769                          */
5770                         inp = stcb->sctp_ep;
5771 #if defined(INET) || defined(INET6)
5772                         if ((net) && (port)) {
5773                                 if (net->port == 0) {
5774                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5775                                 }
5776                                 net->port = port;
5777                         }
5778 #endif
5779                 }
5780         } else {
5781                 /*
5782                  * no control chunks, so pre-process DATA chunks (these
5783                  * checks are taken care of by control processing)
5784                  */
5785
5786                 /*
5787                  * if DATA only packet, and auth is required, then punt...
5788                  * can't have authenticated without any AUTH (control)
5789                  * chunks
5790                  */
5791                 if ((stcb != NULL) &&
5792                     (stcb->asoc.auth_supported == 1) &&
5793                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5794                         /* "silently" ignore */
5795                         SCTP_STAT_INCR(sctps_recvauthmissing);
5796                         goto out;
5797                 }
5798                 if (stcb == NULL) {
5799                         /* out of the blue DATA chunk */
5800                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5801                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5802                             msg);
5803                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5804                             mflowtype, mflowid,
5805                             vrf_id, port);
5806                         goto out;
5807                 }
5808                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5809                         /* v_tag mismatch! */
5810                         SCTP_STAT_INCR(sctps_badvtag);
5811                         goto out;
5812                 }
5813         }
5814
5815         if (stcb == NULL) {
5816                 /*
5817                  * no valid TCB for this packet, or we found it's a bad
5818                  * packet while processing control, or we're done with this
5819                  * packet (done or skip rest of data), so we drop it...
5820                  */
5821                 goto out;
5822         }
5823         /*
5824          * DATA chunk processing
5825          */
5826         /* plow through the data chunks while length > offset */
5827
5828         /*
5829          * Rest should be DATA only.  Check authentication state if AUTH for
5830          * DATA is required.
5831          */
5832         if ((length > offset) &&
5833             (stcb != NULL) &&
5834             (stcb->asoc.auth_supported == 1) &&
5835             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5836             !stcb->asoc.authenticated) {
5837                 /* "silently" ignore */
5838                 SCTP_STAT_INCR(sctps_recvauthmissing);
5839                 SCTPDBG(SCTP_DEBUG_AUTH1,
5840                     "Data chunk requires AUTH, skipped\n");
5841                 goto trigger_send;
5842         }
5843         if (length > offset) {
5844                 int retval;
5845
5846                 /*
5847                  * First check to make sure our state is correct. We would
5848                  * not get here unless we really did have a tag, so we don't
5849                  * abort if this happens, just dump the chunk silently.
5850                  */
5851                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5852                 case SCTP_STATE_COOKIE_ECHOED:
5853                         /*
5854                          * we consider data with valid tags in this state
5855                          * shows us the cookie-ack was lost. Imply it was
5856                          * there.
5857                          */
5858                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5859                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5860                                     stcb->asoc.overall_error_count,
5861                                     0,
5862                                     SCTP_FROM_SCTP_INPUT,
5863                                     __LINE__);
5864                         }
5865                         stcb->asoc.overall_error_count = 0;
5866                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5867                         break;
5868                 case SCTP_STATE_COOKIE_WAIT:
5869                         /*
5870                          * We consider OOTB any data sent during asoc setup.
5871                          */
5872                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5873                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5874                             msg);
5875                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5876                             mflowtype, mflowid,
5877                             vrf_id, port);
5878                         goto out;
5879                         /* sa_ignore NOTREACHED */
5880                         break;
5881                 case SCTP_STATE_EMPTY:  /* should not happen */
5882                 case SCTP_STATE_INUSE:  /* should not happen */
5883                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5884                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5885                 default:
5886                         goto out;
5887                         /* sa_ignore NOTREACHED */
5888                         break;
5889                 case SCTP_STATE_OPEN:
5890                 case SCTP_STATE_SHUTDOWN_SENT:
5891                         break;
5892                 }
5893                 /* plow through the data chunks while length > offset */
5894                 retval = sctp_process_data(mm, iphlen, &offset, length,
5895                     src, dst, sh,
5896                     inp, stcb, net, &high_tsn,
5897                     mflowtype, mflowid,
5898                     vrf_id, port);
5899                 if (retval == 2) {
5900                         /*
5901                          * The association aborted, NO UNLOCK needed since
5902                          * the association is destroyed.
5903                          */
5904                         stcb = NULL;
5905                         goto out;
5906                 }
5907                 data_processed = 1;
5908                 /*
5909                  * Anything important needs to have been m_copy'ed in
5910                  * process_data
5911                  */
5912         }
5913         /* take care of ecn */
5914         if ((data_processed == 1) &&
5915             (stcb->asoc.ecn_supported == 1) &&
5916             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5917                 /* Yep, we need to add a ECNE */
5918                 sctp_send_ecn_echo(stcb, net, high_tsn);
5919         }
5920         if ((data_processed == 0) && (fwd_tsn_seen)) {
5921                 int was_a_gap;
5922                 uint32_t highest_tsn;
5923
5924                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5925                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5926                 } else {
5927                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5928                 }
5929                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5930                 stcb->asoc.send_sack = 1;
5931                 sctp_sack_check(stcb, was_a_gap);
5932         } else if (fwd_tsn_seen) {
5933                 stcb->asoc.send_sack = 1;
5934         }
5935         /* trigger send of any chunks in queue... */
5936 trigger_send:
5937 #ifdef SCTP_AUDITING_ENABLED
5938         sctp_audit_log(0xE0, 2);
5939         sctp_auditing(1, inp, stcb, net);
5940 #endif
5941         SCTPDBG(SCTP_DEBUG_INPUT1,
5942             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5943             stcb->asoc.peers_rwnd,
5944             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5945             stcb->asoc.total_flight);
5946         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5947         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5948                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5949         }
5950         if (cnt_ctrl_ready ||
5951             ((un_sent) &&
5952             (stcb->asoc.peers_rwnd > 0 ||
5953             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5954                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5955                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5956                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5957         }
5958 #ifdef SCTP_AUDITING_ENABLED
5959         sctp_audit_log(0xE0, 3);
5960         sctp_auditing(2, inp, stcb, net);
5961 #endif
5962 out:
5963         if (stcb != NULL) {
5964                 SCTP_TCB_UNLOCK(stcb);
5965         }
5966         if (inp_decr != NULL) {
5967                 /* reduce ref-count */
5968                 SCTP_INP_WLOCK(inp_decr);
5969                 SCTP_INP_DECR_REF(inp_decr);
5970                 SCTP_INP_WUNLOCK(inp_decr);
5971         }
5972 #ifdef INVARIANTS
5973         if (inp != NULL) {
5974                 sctp_validate_no_locks(inp);
5975         }
5976 #endif
5977         return;
5978 }
5979
5980 #if 0
5981 static void
5982 sctp_print_mbuf_chain(struct mbuf *m)
5983 {
5984         for (; m; m = SCTP_BUF_NEXT(m)) {
5985                 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
5986                 if (SCTP_BUF_IS_EXTENDED(m))
5987                         SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
5988         }
5989 }
5990
5991 #endif
5992
5993 #ifdef INET
5994 void
5995 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5996 {
5997         struct mbuf *m;
5998         int iphlen;
5999         uint32_t vrf_id = 0;
6000         uint8_t ecn_bits;
6001         struct sockaddr_in src, dst;
6002         struct ip *ip;
6003         struct sctphdr *sh;
6004         struct sctp_chunkhdr *ch;
6005         int length, offset;
6006
6007 #if !defined(SCTP_WITH_NO_CSUM)
6008         uint8_t compute_crc;
6009
6010 #endif
6011         uint32_t mflowid;
6012         uint8_t mflowtype;
6013
6014         iphlen = off;
6015         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6016                 SCTP_RELEASE_PKT(i_pak);
6017                 return;
6018         }
6019         m = SCTP_HEADER_TO_CHAIN(i_pak);
6020 #ifdef SCTP_MBUF_LOGGING
6021         /* Log in any input mbufs */
6022         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6023                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6024         }
6025 #endif
6026 #ifdef SCTP_PACKET_LOGGING
6027         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6028                 sctp_packet_log(m);
6029         }
6030 #endif
6031         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6032             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6033             m->m_pkthdr.len,
6034             if_name(m->m_pkthdr.rcvif),
6035             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6036         mflowid = m->m_pkthdr.flowid;
6037         mflowtype = M_HASHTYPE_GET(m);
6038         SCTP_STAT_INCR(sctps_recvpackets);
6039         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6040         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6041         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6042         if (SCTP_BUF_LEN(m) < offset) {
6043                 if ((m = m_pullup(m, offset)) == NULL) {
6044                         SCTP_STAT_INCR(sctps_hdrops);
6045                         return;
6046                 }
6047         }
6048         ip = mtod(m, struct ip *);
6049         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6050         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6051         offset -= sizeof(struct sctp_chunkhdr);
6052         memset(&src, 0, sizeof(struct sockaddr_in));
6053         src.sin_family = AF_INET;
6054         src.sin_len = sizeof(struct sockaddr_in);
6055         src.sin_port = sh->src_port;
6056         src.sin_addr = ip->ip_src;
6057         memset(&dst, 0, sizeof(struct sockaddr_in));
6058         dst.sin_family = AF_INET;
6059         dst.sin_len = sizeof(struct sockaddr_in);
6060         dst.sin_port = sh->dest_port;
6061         dst.sin_addr = ip->ip_dst;
6062         length = ntohs(ip->ip_len);
6063         /* Validate mbuf chain length with IP payload length. */
6064         if (SCTP_HEADER_LEN(m) != length) {
6065                 SCTPDBG(SCTP_DEBUG_INPUT1,
6066                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6067                 SCTP_STAT_INCR(sctps_hdrops);
6068                 goto out;
6069         }
6070         /* SCTP does not allow broadcasts or multicasts */
6071         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6072                 goto out;
6073         }
6074         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6075                 goto out;
6076         }
6077         ecn_bits = ip->ip_tos;
6078 #if defined(SCTP_WITH_NO_CSUM)
6079         SCTP_STAT_INCR(sctps_recvnocrc);
6080 #else
6081         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6082                 SCTP_STAT_INCR(sctps_recvhwcrc);
6083                 compute_crc = 0;
6084         } else {
6085                 SCTP_STAT_INCR(sctps_recvswcrc);
6086                 compute_crc = 1;
6087         }
6088 #endif
6089         sctp_common_input_processing(&m, iphlen, offset, length,
6090             (struct sockaddr *)&src,
6091             (struct sockaddr *)&dst,
6092             sh, ch,
6093 #if !defined(SCTP_WITH_NO_CSUM)
6094             compute_crc,
6095 #endif
6096             ecn_bits,
6097             mflowtype, mflowid,
6098             vrf_id, port);
6099 out:
6100         if (m) {
6101                 sctp_m_freem(m);
6102         }
6103         return;
6104 }
6105
6106 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6107 extern int *sctp_cpuarry;
6108
6109 #endif
6110
6111 void
6112 sctp_input(struct mbuf *m, int off)
6113 {
6114 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6115         struct ip *ip;
6116         struct sctphdr *sh;
6117         int offset;
6118         int cpu_to_use;
6119         uint32_t flowid, tag;
6120
6121         if (mp_ncpus > 1) {
6122                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6123                         flowid = m->m_pkthdr.flowid;
6124                 } else {
6125                         /*
6126                          * No flow id built by lower layers fix it so we
6127                          * create one.
6128                          */
6129                         offset = off + sizeof(struct sctphdr);
6130                         if (SCTP_BUF_LEN(m) < offset) {
6131                                 if ((m = m_pullup(m, offset)) == NULL) {
6132                                         SCTP_STAT_INCR(sctps_hdrops);
6133                                         return;
6134                                 }
6135                         }
6136                         ip = mtod(m, struct ip *);
6137                         sh = (struct sctphdr *)((caddr_t)ip + off);
6138                         tag = htonl(sh->v_tag);
6139                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6140                         m->m_pkthdr.flowid = flowid;
6141                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6142                 }
6143                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6144                 sctp_queue_to_mcore(m, off, cpu_to_use);
6145                 return;
6146         }
6147 #endif
6148         sctp_input_with_port(m, off, 0);
6149 }
6150
6151 #endif