src/third_party/usrsctp/usrsctplib/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 #ifdef __FreeBSD__
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 271230 2014-09-07 18:05:37Z tuexen $");
  36 #endif
  37
  38 #include <netinet/sctp_os.h>
  39 #include <netinet/sctp_var.h>
  40 #include <netinet/sctp_sysctl.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctputil.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_input.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_bsd_addr.h>
  50 #include <netinet/sctp_timer.h>
  51 #include <netinet/sctp_crc32.h>
  52 #if defined(INET) || defined(INET6)
  53 #if !defined(__Userspace_os_Windows)
  54 #include <netinet/udp.h>
  55 #endif
  56 #endif
  57 #if defined(__FreeBSD__)
  58 #include <sys/smp.h>
  59 #endif
  60
  61 #if defined(__APPLE__)
  62 #define APPLE_FILE_NO 2
  63 #endif
  64
  65
  66 static void
  67 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  68 {
  69         struct sctp_nets *net;
  70
  71         /* This now not only stops all cookie timers
  72          * it also stops any INIT timers as well. This
  73          * will make sure that the timers are stopped in
  74          * all collision cases.
  75          */
  76         SCTP_TCB_LOCK_ASSERT(stcb);
  77         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  78                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  79                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  80                                         stcb->sctp_ep,
  81                                         stcb,
  82                                         net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_1);
  83                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  84                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  85                                         stcb->sctp_ep,
  86                                         stcb,
  87                                         net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_2);
  88                 }
  89         }
  90 }
  91
  92 /* INIT handler */
  93 static void
  94 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  95                  struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  96                  struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  97                  struct sctp_tcb *stcb, int *abort_no_unlock,
  98 #if defined(__FreeBSD__)
  99                  uint8_t use_mflowid, uint32_t mflowid,
 100 #endif
 101                  uint32_t vrf_id, uint16_t port)
 102 {
 103         struct sctp_init *init;
 104         struct mbuf *op_err;
 105
 106         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
 107                 (void *)stcb);
 108         if (stcb == NULL) {
 109                 SCTP_INP_RLOCK(inp);
 110         }
 111         /* validate length */
 112         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 113                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 114                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 115 #if defined(__FreeBSD__)
 116                                        use_mflowid, mflowid,
 117 #endif
 118                                        vrf_id, port);
 119                 if (stcb)
 120                         *abort_no_unlock = 1;
 121                 goto outnow;
 122         }
 123         /* validate parameters */
 124         init = &cp->init;
 125         if (init->initiate_tag == 0) {
 126                 /* protocol error... send abort */
 127                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 128                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 129 #if defined(__FreeBSD__)
 130                                        use_mflowid, mflowid,
 131 #endif
 132                                        vrf_id, port);
 133                 if (stcb)
 134                         *abort_no_unlock = 1;
 135                 goto outnow;
 136         }
 137         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 138                 /* invalid parameter... send abort */
 139                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 140                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 141 #if defined(__FreeBSD__)
 142                                        use_mflowid, mflowid,
 143 #endif
 144                                        vrf_id, port);
 145                 if (stcb)
 146                         *abort_no_unlock = 1;
 147                 goto outnow;
 148         }
 149         if (init->num_inbound_streams == 0) {
 150                 /* protocol error... send abort */
 151                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 152                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 153 #if defined(__FreeBSD__)
 154                                        use_mflowid, mflowid,
 155 #endif
 156                                        vrf_id, port);
 157                 if (stcb)
 158                         *abort_no_unlock = 1;
 159                 goto outnow;
 160         }
 161         if (init->num_outbound_streams == 0) {
 162                 /* protocol error... send abort */
 163                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 164                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 165 #if defined(__FreeBSD__)
 166                                        use_mflowid, mflowid,
 167 #endif
 168                                        vrf_id, port);
 169                 if (stcb)
 170                         *abort_no_unlock = 1;
 171                 goto outnow;
 172         }
 173         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 174                                            offset + ntohs(cp->ch.chunk_length))) {
 175                 /* auth parameter(s) error... send abort */
 176                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 177                                              "Problem with AUTH parameters");
 178                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 179 #if defined(__FreeBSD__)
 180                                        use_mflowid, mflowid,
 181 #endif
 182                                        vrf_id, port);
 183                 if (stcb)
 184                         *abort_no_unlock = 1;
 185                 goto outnow;
 186         }
 187         /* We are only accepting if we have a socket with positive so_qlimit.*/
 188         if ((stcb == NULL) &&
 189             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 190              (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 191              (inp->sctp_socket == NULL) ||
 192              (inp->sctp_socket->so_qlimit == 0))) {
 193                 /*
 194                  * FIX ME ?? What about TCP model and we have a
 195                  * match/restart case? Actually no fix is needed.
 196                  * the lookup will always find the existing assoc so stcb
 197                  * would not be NULL. It may be questionable to do this
 198                  * since we COULD just send back the INIT-ACK and hope that
 199                  * the app did accept()'s by the time the COOKIE was sent. But
 200                  * there is a price to pay for COOKIE generation and I don't
 201                  * want to pay it on the chance that the app will actually do
 202                  * some accepts(). The App just looses and should NOT be in
 203                  * this state :-)
 204                  */
 205                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 206                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 207                                                      "No listener");
 208                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 209 #if defined(__FreeBSD__)
 210                                         use_mflowid, mflowid,
 211 #endif
 212                                         vrf_id, port);
 213                 }
 214                 goto outnow;
 215         }
 216         if ((stcb != NULL) &&
 217             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 218                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 219                 sctp_send_shutdown_ack(stcb, NULL);
 220                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 221         } else {
 222                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 223                 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst,
 224                                        sh, cp,
 225 #if defined(__FreeBSD__)
 226                                        use_mflowid, mflowid,
 227 #endif
 228                                        vrf_id, port,
 229                                        ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 230         }
 231  outnow:
 232         if (stcb == NULL) {
 233                 SCTP_INP_RUNLOCK(inp);
 234         }
 235 }
 236
 237 /*
 238  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 239  */
 240
 241 int
 242 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 243 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 244         SCTP_UNUSED
 245 #endif
 246 )
 247 {
 248         int unsent_data = 0;
 249         unsigned int i;
 250         struct sctp_stream_queue_pending *sp;
 251         struct sctp_association *asoc;
 252
 253         /* This function returns the number of streams that have
 254          * true unsent data on them. Note that as it looks through
 255          * it will clean up any places that have old data that
 256          * has been sent but left at top of stream queue.
 257          */
 258         asoc = &stcb->asoc;
 259         SCTP_TCB_SEND_LOCK(stcb);
 260         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 261                 /* Check to see if some data queued */
 262                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 263                         /*sa_ignore FREED_MEMORY*/
 264                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 265                         if (sp == NULL) {
 266                                 continue;
 267                         }
 268                         if ((sp->msg_is_complete) &&
 269                             (sp->length == 0)  &&
 270                             (sp->sender_all_done)) {
 271                                 /* We are doing differed cleanup. Last
 272                                  * time through when we took all the data
 273                                  * the sender_all_done was not set.
 274                                  */
 275                                 if (sp->put_last_out == 0) {
 276                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 277                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 278                                                     sp->sender_all_done,
 279                                                     sp->length,
 280                                                     sp->msg_is_complete,
 281                                                     sp->put_last_out);
 282                                 }
 283                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 284                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 285                                 if (sp->net) {
 286                                         sctp_free_remote_addr(sp->net);
 287                                         sp->net = NULL;
 288                                 }
 289                                 if (sp->data) {
 290                                         sctp_m_freem(sp->data);
 291                                         sp->data = NULL;
 292                                 }
 293                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 294                         } else {
 295                                 unsent_data++;
 296                                 break;
 297                         }
 298                 }
 299         }
 300         SCTP_TCB_SEND_UNLOCK(stcb);
 301         return (unsent_data);
 302 }
 303
 304 static int
 305 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 306 {
 307         struct sctp_init *init;
 308         struct sctp_association *asoc;
 309         struct sctp_nets *lnet;
 310         unsigned int i;
 311
 312         init = &cp->init;
 313         asoc = &stcb->asoc;
 314         /* save off parameters */
 315         asoc->peer_vtag = ntohl(init->initiate_tag);
 316         asoc->peers_rwnd = ntohl(init->a_rwnd);
 317         /* init tsn's */
 318         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 319
 320         if (!TAILQ_EMPTY(&asoc->nets)) {
 321                 /* update any ssthresh's that may have a default */
 322                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 323                         lnet->ssthresh = asoc->peers_rwnd;
 324                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE|SCTP_CWND_LOGGING_ENABLE)) {
 325                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 326                         }
 327
 328                 }
 329         }
 330         SCTP_TCB_SEND_LOCK(stcb);
 331         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 332                 unsigned int newcnt;
 333                 struct sctp_stream_out *outs;
 334                 struct sctp_stream_queue_pending *sp, *nsp;
 335                 struct sctp_tmit_chunk *chk, *nchk;
 336
 337                 /* abandon the upper streams */
 338                 newcnt = ntohs(init->num_inbound_streams);
 339                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 340                         if (chk->rec.data.stream_number >= newcnt) {
 341                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 342                                 asoc->send_queue_cnt--;
 343                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
 344                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
 345 #ifdef INVARIANTS
 346                                 } else {
 347                                         panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
 348 #endif
 349                                 }
 350                                 if (chk->data != NULL) {
 351                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 352                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 353                                                         0, chk, SCTP_SO_NOT_LOCKED);
 354                                         if (chk->data) {
 355                                                 sctp_m_freem(chk->data);
 356                                                 chk->data = NULL;
 357                                         }
 358                                 }
 359                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 360                                 /*sa_ignore FREED_MEMORY*/
 361                         }
 362                 }
 363                 if (asoc->strmout) {
 364                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 365                                 outs = &asoc->strmout[i];
 366                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 367                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 368                                         asoc->stream_queue_cnt--;
 369                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 370                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 371                                         if (sp->data) {
 372                                                 sctp_m_freem(sp->data);
 373                                                 sp->data = NULL;
 374                                         }
 375                                         if (sp->net) {
 376                                                 sctp_free_remote_addr(sp->net);
 377                                                 sp->net = NULL;
 378                                         }
 379                                         /* Free the chunk */
 380                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 381                                         /*sa_ignore FREED_MEMORY*/
 382                                 }
 383                         }
 384                 }
 385                 /* cut back the count */
 386                 asoc->pre_open_streams = newcnt;
 387         }
 388         SCTP_TCB_SEND_UNLOCK(stcb);
 389         asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams;
 390
 391         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 392         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 393         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 394                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 395         }
 396         /* This is the next one we expect */
 397         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 398
 399         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 400         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 401
 402         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 403         /* open the requested streams */
 404
 405         if (asoc->strmin != NULL) {
 406                 /* Free the old ones */
 407                 struct sctp_queued_to_read *ctl, *nctl;
 408
 409                 for (i = 0; i < asoc->streamincnt; i++) {
 410                         TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) {
 411                                 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next);
 412                                 sctp_free_remote_addr(ctl->whoFrom);
 413                                 ctl->whoFrom = NULL;
 414                                 sctp_m_freem(ctl->data);
 415                                 ctl->data = NULL;
 416                                 sctp_free_a_readq(stcb, ctl);
 417                         }
 418                 }
 419                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 420         }
 421         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 422                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 423         } else {
 424                 asoc->streamincnt = asoc->max_inbound_streams;
 425         }
 426         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 427                     sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 428         if (asoc->strmin == NULL) {
 429                 /* we didn't get memory for the streams! */
 430                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 431                 return (-1);
 432         }
 433         for (i = 0; i < asoc->streamincnt; i++) {
 434                 asoc->strmin[i].stream_no = i;
 435                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 436                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 437                 asoc->strmin[i].delivery_started = 0;
 438         }
 439         /*
 440          * load_address_from_init will put the addresses into the
 441          * association when the COOKIE is processed or the INIT-ACK is
 442          * processed. Both types of COOKIE's existing and new call this
 443          * routine. It will remove addresses that are no longer in the
 444          * association (for the restarting case where addresses are
 445          * removed). Up front when the INIT arrives we will discard it if it
 446          * is a restart and new addresses have been added.
 447          */
 448         /* sa_ignore MEMLEAK */
 449         return (0);
 450 }
 451
 452 /*
 453  * INIT-ACK message processing/consumption returns value < 0 on error
 454  */
 455 static int
 456 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 457                       struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 458                       struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 459                       struct sctp_nets *net, int *abort_no_unlock,
 460 #if defined(__FreeBSD__)
 461                       uint8_t use_mflowid, uint32_t mflowid,
 462 #endif
 463                       uint32_t vrf_id)
 464 {
 465         struct sctp_association *asoc;
 466         struct mbuf *op_err;
 467         int retval, abort_flag;
 468         uint32_t initack_limit;
 469         int nat_friendly = 0;
 470
 471         /* First verify that we have no illegal param's */
 472         abort_flag = 0;
 473
 474         op_err = sctp_arethere_unrecognized_parameters(m,
 475                                                        (offset + sizeof(struct sctp_init_chunk)),
 476                                                        &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 477         if (abort_flag) {
 478                 /* Send an abort and notify peer */
 479                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 480                 *abort_no_unlock = 1;
 481                 return (-1);
 482         }
 483         asoc = &stcb->asoc;
 484         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 485         /* process the peer's parameters in the INIT-ACK */
 486         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 487         if (retval < 0) {
 488                 return (retval);
 489         }
 490         initack_limit = offset + ntohs(cp->ch.chunk_length);
 491         /* load all addresses */
 492         if ((retval = sctp_load_addresses_from_init(stcb, m,
 493             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 494             src, dst, NULL))) {
 495                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 496                                              "Problem with address parameters");
 497                 SCTPDBG(SCTP_DEBUG_INPUT1,
 498                         "Load addresses from INIT causes an abort %d\n",
 499                         retval);
 500                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 501                                        src, dst, sh, op_err,
 502 #if defined(__FreeBSD__)
 503                                        use_mflowid, mflowid,
 504 #endif
 505                                        vrf_id, net->port);
 506                 *abort_no_unlock = 1;
 507                 return (-1);
 508         }
 509         /* if the peer doesn't support asconf, flush the asconf queue */
 510         if (asoc->asconf_supported == 0) {
 511                 struct sctp_asconf_addr *param, *nparam;
 512
 513                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 514                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 515                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 516                 }
 517         }
 518
 519         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 520             stcb->asoc.local_hmacs);
 521         if (op_err) {
 522                 sctp_queue_op_err(stcb, op_err);
 523                 /* queuing will steal away the mbuf chain to the out queue */
 524                 op_err = NULL;
 525         }
 526         /* extract the cookie and queue it to "echo" it back... */
 527         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 528                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 529                                stcb->asoc.overall_error_count,
 530                                0,
 531                                SCTP_FROM_SCTP_INPUT,
 532                                __LINE__);
 533         }
 534         stcb->asoc.overall_error_count = 0;
 535         net->error_count = 0;
 536
 537         /*
 538          * Cancel the INIT timer, We do this first before queueing the
 539          * cookie. We always cancel at the primary to assue that we are
 540          * canceling the timer started by the INIT which always goes to the
 541          * primary.
 542          */
 543         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 544             asoc->primary_destination, SCTP_FROM_SCTP_INPUT+SCTP_LOC_4);
 545
 546         /* calculate the RTO */
 547         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 548                                       SCTP_RTT_FROM_NON_DATA);
 549
 550         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 551         if (retval < 0) {
 552                 /*
 553                  * No cookie, we probably should send a op error. But in any
 554                  * case if there is no cookie in the INIT-ACK, we can
 555                  * abandon the peer, its broke.
 556                  */
 557                 if (retval == -3) {
 558                         /* We abort with an error of missing mandatory param */
 559                         op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, "");
 560                         if (op_err) {
 561                                 /*
 562                                  * Expand beyond to include the mandatory
 563                                  * param cookie
 564                                  */
 565                                 struct sctp_inv_mandatory_param *mp;
 566
 567                                 SCTP_BUF_LEN(op_err) =
 568                                     sizeof(struct sctp_inv_mandatory_param);
 569                                 mp = mtod(op_err,
 570                                     struct sctp_inv_mandatory_param *);
 571                                 /* Subtract the reserved param */
 572                                 mp->length =
 573                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 574                                 mp->num_param = htonl(1);
 575                                 mp->param = htons(SCTP_STATE_COOKIE);
 576                                 mp->resv = 0;
 577                         }
 578                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 579                                                src, dst, sh, op_err,
 580 #if defined(__FreeBSD__)
 581                                                use_mflowid, mflowid,
 582 #endif
 583                                                vrf_id, net->port);
 584                         *abort_no_unlock = 1;
 585                 }
 586                 return (retval);
 587         }
 588
 589         return (0);
 590 }
 591
 592 static void
 593 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 594     struct sctp_tcb *stcb, struct sctp_nets *net)
 595 {
 596         union sctp_sockstore store;
 597         struct sctp_nets *r_net, *f_net;
 598         struct timeval tv;
 599         int req_prim = 0;
 600         uint16_t old_error_counter;
 601
 602         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 603                 /* Invalid length */
 604                 return;
 605         }
 606
 607         memset(&store, 0, sizeof(store));
 608         switch (cp->heartbeat.hb_info.addr_family) {
 609 #ifdef INET
 610         case AF_INET:
 611                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 612                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 613 #ifdef HAVE_SIN_LEN
 614                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 615 #endif
 616                         store.sin.sin_port = stcb->rport;
 617                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 618                                sizeof(store.sin.sin_addr));
 619                 } else {
 620                         return;
 621                 }
 622                 break;
 623 #endif
 624 #ifdef INET6
 625         case AF_INET6:
 626                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 627                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 628 #ifdef HAVE_SIN6_LEN
 629                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 630 #endif
 631                         store.sin6.sin6_port = stcb->rport;
 632                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 633                 } else {
 634                         return;
 635                 }
 636                 break;
 637 #endif
 638 #if defined(__Userspace__)
 639         case AF_CONN:
 640                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_conn)) {
 641                         store.sconn.sconn_family = cp->heartbeat.hb_info.addr_family;
 642 #ifdef HAVE_SCONN_LEN
 643                         store.sconn.sconn_len = cp->heartbeat.hb_info.addr_len;
 644 #endif
 645                         store.sconn.sconn_port = stcb->rport;
 646                         memcpy(&store.sconn.sconn_addr, cp->heartbeat.hb_info.address, sizeof(void *));
 647                 } else {
 648                         return;
 649                 }
 650                 break;
 651 #endif
 652         default:
 653                 return;
 654         }
 655         r_net = sctp_findnet(stcb, &store.sa);
 656         if (r_net == NULL) {
 657                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 658                 return;
 659         }
 660         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 661             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 662             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 663                 /*
 664                  * If the its a HB and it's random value is correct when can
 665                  * confirm the destination.
 666                  */
 667                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 668                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 669                         stcb->asoc.primary_destination = r_net;
 670                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 671                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 672                         if (f_net != r_net) {
 673                                 /* first one on the list is NOT the primary
 674                                  * sctp_cmpaddr() is much more efficent if
 675                                  * the primary is the first on the list, make it
 676                                  * so.
 677                                  */
 678                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 679                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 680                         }
 681                         req_prim = 1;
 682                 }
 683                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 684                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 685                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 686                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 687         }
 688         old_error_counter = r_net->error_count;
 689         r_net->error_count = 0;
 690         r_net->hb_responded = 1;
 691         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 692         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 693         /* Now lets do a RTO with this */
 694         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 695                                         SCTP_RTT_FROM_NON_DATA);
 696         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 697                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 698                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 699                                 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 700         }
 701         if (r_net->dest_state & SCTP_ADDR_PF) {
 702                 r_net->dest_state &= ~SCTP_ADDR_PF;
 703                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 704         }
 705         if (old_error_counter > 0) {
 706                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 707                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 708         }
 709         if (r_net == stcb->asoc.primary_destination) {
 710                 if (stcb->asoc.alternate) {
 711                         /* release the alternate, primary is good */
 712                         sctp_free_remote_addr(stcb->asoc.alternate);
 713                         stcb->asoc.alternate = NULL;
 714                 }
 715         }
 716         /* Mobility adaptation */
 717         if (req_prim) {
 718                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 719                                                  SCTP_MOBILITY_BASE) ||
 720                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 721                                                 SCTP_MOBILITY_FASTHANDOFF)) &&
 722                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 723                                                 SCTP_MOBILITY_PRIM_DELETED)) {
 724
 725                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER+SCTP_LOC_7);
 726                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 727                                         SCTP_MOBILITY_FASTHANDOFF)) {
 728                                 sctp_assoc_immediate_retrans(stcb,
 729                                         stcb->asoc.primary_destination);
 730                         }
 731                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 732                                         SCTP_MOBILITY_BASE)) {
 733                                 sctp_move_chunks_from_net(stcb,
 734                                         stcb->asoc.deleted_primary);
 735                         }
 736                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 737                                         stcb->asoc.deleted_primary);
 738                 }
 739         }
 740 }
 741
 742 static int
 743 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 744 {
 745         /* return 0 means we want you to proceed with the abort
 746          * non-zero means no abort processing
 747         */
 748         struct sctpasochead *head;
 749
 750         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 751                 /* generate a new vtag and send init */
 752                 LIST_REMOVE(stcb, sctp_asocs);
 753                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 754                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 755                 /* put it in the bucket in the vtag hash of assoc's for the system */
 756                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 757                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 758                 return (1);
 759         }
 760         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 761                 /* treat like a case where the cookie expired i.e.:
 762                 * - dump current cookie.
 763                 * - generate a new vtag.
 764                 * - resend init.
 765                 */
 766                 /* generate a new vtag and send init */
 767                 LIST_REMOVE(stcb, sctp_asocs);
 768                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 769                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 770                 sctp_stop_all_cookie_timers(stcb);
 771                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 772                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport,  1);
 773                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 774                 /* put it in the bucket in the vtag hash of assoc's for the system */
 775                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 776                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 777                 return (1);
 778         }
 779         return (0);
 780 }
 781
 782 static int
 783 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 784                               struct sctp_nets *net)
 785 {
 786         /* return 0 means we want you to proceed with the abort
 787          * non-zero means no abort processing
 788          */
 789         if (stcb->asoc.auth_supported == 0) {
 790                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 791                 return (0);
 792         }
 793         sctp_asconf_send_nat_state_update(stcb, net);
 794         return (1);
 795 }
 796
 797
 798 static void
 799 sctp_handle_abort(struct sctp_abort_chunk *abort,
 800     struct sctp_tcb *stcb, struct sctp_nets *net)
 801 {
 802 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 803         struct socket *so;
 804 #endif
 805         uint16_t len;
 806         uint16_t error;
 807
 808         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 809         if (stcb == NULL)
 810                 return;
 811
 812         len = ntohs(abort->ch.chunk_length);
 813         if (len > sizeof (struct sctp_chunkhdr)) {
 814                 /* Need to check the cause codes for our
 815                  * two magic nat aborts which don't kill the assoc
 816                  * necessarily.
 817                  */
 818                 struct sctp_missing_nat_state *natc;
 819
 820                 natc = (struct sctp_missing_nat_state *)(abort + 1);
 821                 error = ntohs(natc->cause);
 822                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 823                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 824                                                    abort->ch.chunk_flags);
 825                         if (sctp_handle_nat_colliding_state(stcb)) {
 826                                 return;
 827                         }
 828                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 829                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 830                                                    abort->ch.chunk_flags);
 831                         if (sctp_handle_nat_missing_state(stcb, net)) {
 832                                 return;
 833                         }
 834                 }
 835         } else {
 836                 error = 0;
 837         }
 838         /* stop any receive timers */
 839         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_6);
 840         /* notify user of the abort and clean up... */
 841         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 842         /* free the tcb */
 843         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 844         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 845             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 846                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 847         }
 848 #ifdef SCTP_ASOCLOG_OF_TSNS
 849         sctp_print_out_track_log(stcb);
 850 #endif
 851 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 852         so = SCTP_INP_SO(stcb->sctp_ep);
 853         atomic_add_int(&stcb->asoc.refcnt, 1);
 854         SCTP_TCB_UNLOCK(stcb);
 855         SCTP_SOCKET_LOCK(so, 1);
 856         SCTP_TCB_LOCK(stcb);
 857         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 858 #endif
 859         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 860         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 861                               SCTP_FROM_SCTP_INPUT+SCTP_LOC_6);
 862 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 863         SCTP_SOCKET_UNLOCK(so, 1);
 864 #endif
 865         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 866 }
 867
 868 static void
 869 sctp_start_net_timers(struct sctp_tcb *stcb)
 870 {
 871         uint32_t cnt_hb_sent;
 872         struct sctp_nets *net;
 873
 874         cnt_hb_sent = 0;
 875         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 876                 /* For each network start:
 877                  * 1) A pmtu timer.
 878                  * 2) A HB timer
 879                  * 3) If the dest in unconfirmed send
 880                  *    a hb as well if under max_hb_burst have
 881                  *    been sent.
 882                  */
 883                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 884                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 885                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 886                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 887                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 888                         cnt_hb_sent++;
 889                 }
 890         }
 891         if (cnt_hb_sent) {
 892                 sctp_chunk_output(stcb->sctp_ep, stcb,
 893                                   SCTP_OUTPUT_FROM_COOKIE_ACK,
 894                                   SCTP_SO_NOT_LOCKED);
 895         }
 896 }
 897
 898
 899 static void
 900 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 901     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 902 {
 903         struct sctp_association *asoc;
 904         int some_on_streamwheel;
 905 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 906         struct socket *so;
 907 #endif
 908
 909         SCTPDBG(SCTP_DEBUG_INPUT2,
 910                 "sctp_handle_shutdown: handling SHUTDOWN\n");
 911         if (stcb == NULL)
 912                 return;
 913         asoc = &stcb->asoc;
 914         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 915             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 916                 return;
 917         }
 918         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 919                 /* Shutdown NOT the expected size */
 920                 return;
 921         } else {
 922                 sctp_update_acked(stcb, cp, abort_flag);
 923                 if (*abort_flag) {
 924                         return;
 925                 }
 926         }
 927         if (asoc->control_pdapi) {
 928                 /* With a normal shutdown
 929                  * we assume the end of last record.
 930                  */
 931                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 932                 asoc->control_pdapi->end_added = 1;
 933                 asoc->control_pdapi->pdapi_aborted = 1;
 934                 asoc->control_pdapi = NULL;
 935                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 936 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 937                 so = SCTP_INP_SO(stcb->sctp_ep);
 938                 atomic_add_int(&stcb->asoc.refcnt, 1);
 939                 SCTP_TCB_UNLOCK(stcb);
 940                 SCTP_SOCKET_LOCK(so, 1);
 941                 SCTP_TCB_LOCK(stcb);
 942                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 943                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 944                         /* assoc was freed while we were unlocked */
 945                         SCTP_SOCKET_UNLOCK(so, 1);
 946                         return;
 947                 }
 948 #endif
 949                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 950 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 951                 SCTP_SOCKET_UNLOCK(so, 1);
 952 #endif
 953         }
 954         /* goto SHUTDOWN_RECEIVED state to block new requests */
 955         if (stcb->sctp_socket) {
 956                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 957                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 958                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 959                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 960                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 961                         /* notify upper layer that peer has initiated a shutdown */
 962                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 963
 964                         /* reset time */
 965                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 966                 }
 967         }
 968         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 969                 /*
 970                  * stop the shutdown timer, since we WILL move to
 971                  * SHUTDOWN-ACK-SENT.
 972                  */
 973                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_8);
 974         }
 975         /* Now is there unsent data on a stream somewhere? */
 976         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 977
 978         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 979             !TAILQ_EMPTY(&asoc->sent_queue) ||
 980             some_on_streamwheel) {
 981                 /* By returning we will push more data out */
 982                 return;
 983         } else {
 984                 /* no outstanding data to send, so move on... */
 985                 /* send SHUTDOWN-ACK */
 986                 /* move to SHUTDOWN-ACK-SENT state */
 987                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 988                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 989                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 990                 }
 991                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 992                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 993                 sctp_stop_timers_for_shutdown(stcb);
 994                 sctp_send_shutdown_ack(stcb, net);
 995                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 996                                  stcb, net);
 997         }
 998 }
 999
1000 static void
1001 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
1002                          struct sctp_tcb *stcb,
1003                          struct sctp_nets *net)
1004 {
1005         struct sctp_association *asoc;
1006 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1007         struct socket *so;
1008
1009         so = SCTP_INP_SO(stcb->sctp_ep);
1010 #endif
1011         SCTPDBG(SCTP_DEBUG_INPUT2,
1012                 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1013         if (stcb == NULL)
1014                 return;
1015
1016         asoc = &stcb->asoc;
1017         /* process according to association state */
1018         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
1019             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
1020                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1021                 sctp_send_shutdown_complete(stcb, net, 1);
1022                 SCTP_TCB_UNLOCK(stcb);
1023                 return;
1024         }
1025         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
1026             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1027                 /* unexpected SHUTDOWN-ACK... so ignore... */
1028                 SCTP_TCB_UNLOCK(stcb);
1029                 return;
1030         }
1031         if (asoc->control_pdapi) {
1032                 /* With a normal shutdown
1033                  * we assume the end of last record.
1034                  */
1035                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1036                 asoc->control_pdapi->end_added = 1;
1037                 asoc->control_pdapi->pdapi_aborted = 1;
1038                 asoc->control_pdapi = NULL;
1039                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1040 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1041                 atomic_add_int(&stcb->asoc.refcnt, 1);
1042                 SCTP_TCB_UNLOCK(stcb);
1043                 SCTP_SOCKET_LOCK(so, 1);
1044                 SCTP_TCB_LOCK(stcb);
1045                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1046                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1047                         /* assoc was freed while we were unlocked */
1048                         SCTP_SOCKET_UNLOCK(so, 1);
1049                         return;
1050                 }
1051 #endif
1052                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1053 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1054                 SCTP_SOCKET_UNLOCK(so, 1);
1055 #endif
1056         }
1057 #ifdef INVARIANTS
1058         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1059             !TAILQ_EMPTY(&asoc->sent_queue) ||
1060             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1061                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1062         }
1063 #endif
1064         /* stop the timer */
1065         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_9);
1066         /* send SHUTDOWN-COMPLETE */
1067         sctp_send_shutdown_complete(stcb, net, 0);
1068         /* notify upper layer protocol */
1069         if (stcb->sctp_socket) {
1070                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1071                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1072                         stcb->sctp_socket->so_snd.sb_cc = 0;
1073                 }
1074                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1075         }
1076         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1077         /* free the TCB but first save off the ep */
1078 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1079         atomic_add_int(&stcb->asoc.refcnt, 1);
1080         SCTP_TCB_UNLOCK(stcb);
1081         SCTP_SOCKET_LOCK(so, 1);
1082         SCTP_TCB_LOCK(stcb);
1083         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1084 #endif
1085         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1086                               SCTP_FROM_SCTP_INPUT+SCTP_LOC_10);
1087 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1088         SCTP_SOCKET_UNLOCK(so, 1);
1089 #endif
1090 }
1091
1092 /*
1093  * Skip past the param header and then we will find the chunk that caused the
1094  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1095  * our peer must be broken.
1096  */
1097 static void
1098 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1099     struct sctp_nets *net)
1100 {
1101         struct sctp_chunkhdr *chk;
1102
1103         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1104         switch (chk->chunk_type) {
1105         case SCTP_ASCONF_ACK:
1106         case SCTP_ASCONF:
1107                 sctp_asconf_cleanup(stcb, net);
1108                 break;
1109         case SCTP_FORWARD_CUM_TSN:
1110                 stcb->asoc.prsctp_supported = 0;
1111                 break;
1112         default:
1113                 SCTPDBG(SCTP_DEBUG_INPUT2,
1114                         "Peer does not support chunk type %d(%x)??\n",
1115                         chk->chunk_type, (uint32_t) chk->chunk_type);
1116                 break;
1117         }
1118 }
1119
1120 /*
1121  * Skip past the param header and then we will find the param that caused the
1122  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1123  * these will turn of specific features.
1124  * XXX: Is this the right thing to do?
1125  */
1126 static void
1127 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1128 {
1129         struct sctp_paramhdr *pbad;
1130
1131         pbad = phdr + 1;
1132         switch (ntohs(pbad->param_type)) {
1133                 /* pr-sctp draft */
1134         case SCTP_PRSCTP_SUPPORTED:
1135                 stcb->asoc.prsctp_supported = 0;
1136                 break;
1137         case SCTP_SUPPORTED_CHUNK_EXT:
1138                 break;
1139                 /* draft-ietf-tsvwg-addip-sctp */
1140         case SCTP_HAS_NAT_SUPPORT:
1141                 stcb->asoc.peer_supports_nat = 0;
1142                 break;
1143         case SCTP_ADD_IP_ADDRESS:
1144         case SCTP_DEL_IP_ADDRESS:
1145         case SCTP_SET_PRIM_ADDR:
1146                 stcb->asoc.asconf_supported = 0;
1147                 break;
1148         case SCTP_SUCCESS_REPORT:
1149         case SCTP_ERROR_CAUSE_IND:
1150                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1151                 SCTPDBG(SCTP_DEBUG_INPUT2,
1152                         "Turning off ASCONF to this strange peer\n");
1153                 stcb->asoc.asconf_supported = 0;
1154                 break;
1155         default:
1156                 SCTPDBG(SCTP_DEBUG_INPUT2,
1157                         "Peer does not support param type %d(%x)??\n",
1158                         pbad->param_type, (uint32_t) pbad->param_type);
1159                 break;
1160         }
1161 }
1162
1163 static int
1164 sctp_handle_error(struct sctp_chunkhdr *ch,
1165     struct sctp_tcb *stcb, struct sctp_nets *net)
1166 {
1167         int chklen;
1168         struct sctp_paramhdr *phdr;
1169         uint16_t error, error_type;
1170         uint16_t error_len;
1171         struct sctp_association *asoc;
1172         int adjust;
1173 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1174         struct socket *so;
1175 #endif
1176
1177         /* parse through all of the errors and process */
1178         asoc = &stcb->asoc;
1179         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1180             sizeof(struct sctp_chunkhdr));
1181         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1182         error = 0;
1183         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1184                 /* Process an Error Cause */
1185                 error_type = ntohs(phdr->param_type);
1186                 error_len = ntohs(phdr->param_length);
1187                 if ((error_len > chklen) || (error_len == 0)) {
1188                         /* invalid param length for this param */
1189                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1190                                 chklen, error_len);
1191                         return (0);
1192                 }
1193                 if (error == 0) {
1194                         /* report the first error cause */
1195                         error = error_type;
1196                 }
1197                 switch (error_type) {
1198                 case SCTP_CAUSE_INVALID_STREAM:
1199                 case SCTP_CAUSE_MISSING_PARAM:
1200                 case SCTP_CAUSE_INVALID_PARAM:
1201                 case SCTP_CAUSE_NO_USER_DATA:
1202                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1203                                 error_type);
1204                         break;
1205                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1206                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1207                                 ch->chunk_flags);
1208                         if (sctp_handle_nat_colliding_state(stcb)) {
1209                           return (0);
1210                         }
1211                         break;
1212                 case SCTP_CAUSE_NAT_MISSING_STATE:
1213                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1214                                                    ch->chunk_flags);
1215                         if (sctp_handle_nat_missing_state(stcb, net)) {
1216                           return (0);
1217                         }
1218                         break;
1219                 case SCTP_CAUSE_STALE_COOKIE:
1220                         /*
1221                          * We only act if we have echoed a cookie and are
1222                          * waiting.
1223                          */
1224                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1225                                 int *p;
1226
1227                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1228                                 /* Save the time doubled */
1229                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1230                                 asoc->stale_cookie_count++;
1231                                 if (asoc->stale_cookie_count >
1232                                     asoc->max_init_times) {
1233                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1234                                         /* now free the asoc */
1235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1236                                         so = SCTP_INP_SO(stcb->sctp_ep);
1237                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1238                                         SCTP_TCB_UNLOCK(stcb);
1239                                         SCTP_SOCKET_LOCK(so, 1);
1240                                         SCTP_TCB_LOCK(stcb);
1241                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1242 #endif
1243                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1244                                                               SCTP_FROM_SCTP_INPUT+SCTP_LOC_11);
1245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1246                                         SCTP_SOCKET_UNLOCK(so, 1);
1247 #endif
1248                                         return (-1);
1249                                 }
1250                                 /* blast back to INIT state */
1251                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1252                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1253                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1254                                 sctp_stop_all_cookie_timers(stcb);
1255                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1256                         }
1257                         break;
1258                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1259                         /*
1260                          * Nothing we can do here, we don't do hostname
1261                          * addresses so if the peer does not like my IPv6
1262                          * (or IPv4 for that matter) it does not matter. If
1263                          * they don't support that type of address, they can
1264                          * NOT possibly get that packet type... i.e. with no
1265                          * IPv6 you can't recieve a IPv6 packet. so we can
1266                          * safely ignore this one. If we ever added support
1267                          * for HOSTNAME Addresses, then we would need to do
1268                          * something here.
1269                          */
1270                         break;
1271                 case SCTP_CAUSE_UNRECOG_CHUNK:
1272                         sctp_process_unrecog_chunk(stcb, phdr, net);
1273                         break;
1274                 case SCTP_CAUSE_UNRECOG_PARAM:
1275                         sctp_process_unrecog_param(stcb, phdr);
1276                         break;
1277                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1278                         /*
1279                          * We ignore this since the timer will drive out a
1280                          * new cookie anyway and there timer will drive us
1281                          * to send a SHUTDOWN_COMPLETE. We can't send one
1282                          * here since we don't have their tag.
1283                          */
1284                         break;
1285                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1286                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1287                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1288                         /*
1289                          * We should NOT get these here, but in a
1290                          * ASCONF-ACK.
1291                          */
1292                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1293                                 error_type);
1294                         break;
1295                 case SCTP_CAUSE_OUT_OF_RESC:
1296                         /*
1297                          * And what, pray tell do we do with the fact that
1298                          * the peer is out of resources? Not really sure we
1299                          * could do anything but abort. I suspect this
1300                          * should have came WITH an abort instead of in a
1301                          * OP-ERROR.
1302                          */
1303                         break;
1304                 default:
1305                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1306                                 error_type);
1307                         break;
1308                 }
1309                 adjust = SCTP_SIZE32(error_len);
1310                 chklen -= adjust;
1311                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1312         }
1313         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1314         return (0);
1315 }
1316
1317 static int
1318 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1319                      struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1320                      struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1321                      struct sctp_nets *net, int *abort_no_unlock,
1322 #if defined(__FreeBSD__)
1323                      uint8_t use_mflowid, uint32_t mflowid,
1324 #endif
1325                      uint32_t vrf_id)
1326 {
1327         struct sctp_init_ack *init_ack;
1328         struct mbuf *op_err;
1329
1330         SCTPDBG(SCTP_DEBUG_INPUT2,
1331                 "sctp_handle_init_ack: handling INIT-ACK\n");
1332
1333         if (stcb == NULL) {
1334                 SCTPDBG(SCTP_DEBUG_INPUT2,
1335                         "sctp_handle_init_ack: TCB is null\n");
1336                 return (-1);
1337         }
1338         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1339                 /* Invalid length */
1340                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1341                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1342                                        src, dst, sh, op_err,
1343 #if defined(__FreeBSD__)
1344                                        use_mflowid, mflowid,
1345 #endif
1346                                        vrf_id, net->port);
1347                 *abort_no_unlock = 1;
1348                 return (-1);
1349         }
1350         init_ack = &cp->init;
1351         /* validate parameters */
1352         if (init_ack->initiate_tag == 0) {
1353                 /* protocol error... send an abort */
1354                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1355                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1356                                        src, dst, sh, op_err,
1357 #if defined(__FreeBSD__)
1358                                        use_mflowid, mflowid,
1359 #endif
1360                                        vrf_id, net->port);
1361                 *abort_no_unlock = 1;
1362                 return (-1);
1363         }
1364         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1365                 /* protocol error... send an abort */
1366                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1367                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1368                                        src, dst, sh, op_err,
1369 #if defined(__FreeBSD__)
1370                                        use_mflowid, mflowid,
1371 #endif
1372                                        vrf_id, net->port);
1373                 *abort_no_unlock = 1;
1374                 return (-1);
1375         }
1376         if (init_ack->num_inbound_streams == 0) {
1377                 /* protocol error... send an abort */
1378                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1379                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1380                                        src, dst, sh, op_err,
1381 #if defined(__FreeBSD__)
1382                                        use_mflowid, mflowid,
1383 #endif
1384                                        vrf_id, net->port);
1385                 *abort_no_unlock = 1;
1386                 return (-1);
1387         }
1388         if (init_ack->num_outbound_streams == 0) {
1389                 /* protocol error... send an abort */
1390                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1391                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1392                                        src, dst, sh, op_err,
1393 #if defined(__FreeBSD__)
1394                                        use_mflowid, mflowid,
1395 #endif
1396                                        vrf_id, net->port);
1397                 *abort_no_unlock = 1;
1398                 return (-1);
1399         }
1400         /* process according to association state... */
1401         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1402         case SCTP_STATE_COOKIE_WAIT:
1403                 /* this is the expected state for this chunk */
1404                 /* process the INIT-ACK parameters */
1405                 if (stcb->asoc.primary_destination->dest_state &
1406                     SCTP_ADDR_UNCONFIRMED) {
1407                         /*
1408                          * The primary is where we sent the INIT, we can
1409                          * always consider it confirmed when the INIT-ACK is
1410                          * returned. Do this before we load addresses
1411                          * though.
1412                          */
1413                         stcb->asoc.primary_destination->dest_state &=
1414                             ~SCTP_ADDR_UNCONFIRMED;
1415                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1416                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1417                 }
1418                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1419                                           net, abort_no_unlock,
1420 #if defined(__FreeBSD__)
1421                                           use_mflowid, mflowid,
1422 #endif
1423                                           vrf_id) < 0) {
1424                         /* error in parsing parameters */
1425                         return (-1);
1426                 }
1427                 /* update our state */
1428                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1429                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1430
1431                 /* reset the RTO calc */
1432                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1433                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1434                                        stcb->asoc.overall_error_count,
1435                                        0,
1436                                        SCTP_FROM_SCTP_INPUT,
1437                                        __LINE__);
1438                 }
1439                 stcb->asoc.overall_error_count = 0;
1440                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1441                 /*
1442                  * collapse the init timer back in case of a exponential
1443                  * backoff
1444                  */
1445                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1446                     stcb, net);
1447                 /*
1448                  * the send at the end of the inbound data processing will
1449                  * cause the cookie to be sent
1450                  */
1451                 break;
1452         case SCTP_STATE_SHUTDOWN_SENT:
1453                 /* incorrect state... discard */
1454                 break;
1455         case SCTP_STATE_COOKIE_ECHOED:
1456                 /* incorrect state... discard */
1457                 break;
1458         case SCTP_STATE_OPEN:
1459                 /* incorrect state... discard */
1460                 break;
1461         case SCTP_STATE_EMPTY:
1462         case SCTP_STATE_INUSE:
1463         default:
1464                 /* incorrect state... discard */
1465                 return (-1);
1466                 break;
1467         }
1468         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1469         return (0);
1470 }
1471
1472 static struct sctp_tcb *
1473 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1474     struct sockaddr *src, struct sockaddr *dst,
1475     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1476     struct sctp_inpcb *inp, struct sctp_nets **netp,
1477     struct sockaddr *init_src, int *notification,
1478     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1479 #if defined(__FreeBSD__)
1480     uint8_t use_mflowid, uint32_t mflowid,
1481 #endif
1482     uint32_t vrf_id, uint16_t port);
1483
1484
1485 /*
1486  * handle a state cookie for an existing association m: input packet mbuf
1487  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1488  * "split" mbuf and the cookie signature does not exist offset: offset into
1489  * mbuf to the cookie-echo chunk
1490  */
1491 static struct sctp_tcb *
1492 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1493     struct sockaddr *src, struct sockaddr *dst,
1494     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1495     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1496     struct sockaddr *init_src, int *notification,
1497     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1498 #if defined(__FreeBSD__)
1499     uint8_t use_mflowid, uint32_t mflowid,
1500 #endif
1501     uint32_t vrf_id, uint16_t port)
1502 {
1503         struct sctp_association *asoc;
1504         struct sctp_init_chunk *init_cp, init_buf;
1505         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1506         struct sctp_nets *net;
1507         struct mbuf *op_err;
1508         int init_offset, initack_offset, i;
1509         int retval;
1510         int spec_flag = 0;
1511         uint32_t how_indx;
1512 #if defined(SCTP_DETAILED_STR_STATS)
1513         int j;
1514 #endif
1515
1516         net = *netp;
1517         /* I know that the TCB is non-NULL from the caller */
1518         asoc = &stcb->asoc;
1519         for (how_indx = 0; how_indx  < sizeof(asoc->cookie_how); how_indx++) {
1520                 if (asoc->cookie_how[how_indx] == 0)
1521                         break;
1522         }
1523         if (how_indx < sizeof(asoc->cookie_how)) {
1524                 asoc->cookie_how[how_indx] = 1;
1525         }
1526         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1527                 /* SHUTDOWN came in after sending INIT-ACK */
1528                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1529                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1530                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1531 #if defined(__FreeBSD__)
1532                                    use_mflowid, mflowid,
1533 #endif
1534                                    vrf_id, net->port);
1535                 if (how_indx < sizeof(asoc->cookie_how))
1536                         asoc->cookie_how[how_indx] = 2;
1537                 return (NULL);
1538         }
1539         /*
1540          * find and validate the INIT chunk in the cookie (peer's info) the
1541          * INIT should start after the cookie-echo header struct (chunk
1542          * header, state cookie header struct)
1543          */
1544         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1545
1546         init_cp = (struct sctp_init_chunk *)
1547                 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1548                               (uint8_t *) & init_buf);
1549         if (init_cp == NULL) {
1550                 /* could not pull a INIT chunk in cookie */
1551                 return (NULL);
1552         }
1553         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1554                 return (NULL);
1555         }
1556         /*
1557          * find and validate the INIT-ACK chunk in the cookie (my info) the
1558          * INIT-ACK follows the INIT chunk
1559          */
1560         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1561         initack_cp = (struct sctp_init_ack_chunk *)
1562                 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1563                               (uint8_t *) & initack_buf);
1564         if (initack_cp == NULL) {
1565                 /* could not pull INIT-ACK chunk in cookie */
1566                 return (NULL);
1567         }
1568         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1569                 return (NULL);
1570         }
1571         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1572             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1573                 /*
1574                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1575                  * to get into the OPEN state
1576                  */
1577                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1578                         /*-
1579                          * Opps, this means that we somehow generated two vtag's
1580                          * the same. I.e. we did:
1581                          *  Us               Peer
1582                          *   <---INIT(tag=a)------
1583                          *   ----INIT-ACK(tag=t)-->
1584                          *   ----INIT(tag=t)------> *1
1585                          *   <---INIT-ACK(tag=a)---
1586                          *   <----CE(tag=t)------------- *2
1587                          *
1588                          * At point *1 we should be generating a different
1589                          * tag t'. Which means we would throw away the CE and send
1590                          * ours instead. Basically this is case C (throw away side).
1591                          */
1592                         if (how_indx < sizeof(asoc->cookie_how))
1593                                 asoc->cookie_how[how_indx] = 17;
1594                         return (NULL);
1595
1596                 }
1597                 switch (SCTP_GET_STATE(asoc)) {
1598                         case SCTP_STATE_COOKIE_WAIT:
1599                         case SCTP_STATE_COOKIE_ECHOED:
1600                                 /*
1601                                  * INIT was sent but got a COOKIE_ECHO with the
1602                                  * correct tags... just accept it...but we must
1603                                  * process the init so that we can make sure we
1604                                  * have the right seq no's.
1605                                  */
1606                                 /* First we must process the INIT !! */
1607                                 retval = sctp_process_init(init_cp, stcb);
1608                                 if (retval < 0) {
1609                                         if (how_indx < sizeof(asoc->cookie_how))
1610                                                 asoc->cookie_how[how_indx] = 3;
1611                                         return (NULL);
1612                                 }
1613                                 /* we have already processed the INIT so no problem */
1614                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1615                                                 net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_12);
1616                                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_13);
1617                                 /* update current state */
1618                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1619                                         SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1620                                 else
1621                                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1622
1623                                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1624                                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1625                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1626                                                          stcb->sctp_ep, stcb, asoc->primary_destination);
1627                                 }
1628                                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1629                                 sctp_stop_all_cookie_timers(stcb);
1630                                 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1631                                      (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1632                                     (inp->sctp_socket->so_qlimit == 0)
1633                                         ) {
1634 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1635                                         struct socket *so;
1636 #endif
1637                                         /*
1638                                          * Here is where collision would go if we
1639                                          * did a connect() and instead got a
1640                                          * init/init-ack/cookie done before the
1641                                          * init-ack came back..
1642                                          */
1643                                         stcb->sctp_ep->sctp_flags |=
1644                                                 SCTP_PCB_FLAGS_CONNECTED;
1645 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1646                                         so = SCTP_INP_SO(stcb->sctp_ep);
1647                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1648                                         SCTP_TCB_UNLOCK(stcb);
1649                                         SCTP_SOCKET_LOCK(so, 1);
1650                                         SCTP_TCB_LOCK(stcb);
1651                                         atomic_add_int(&stcb->asoc.refcnt, -1);
1652                                         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1653                                                 SCTP_SOCKET_UNLOCK(so, 1);
1654                                                 return (NULL);
1655                                         }
1656 #endif
1657                                         soisconnected(stcb->sctp_socket);
1658 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1659                                         SCTP_SOCKET_UNLOCK(so, 1);
1660 #endif
1661                                 }
1662                                 /* notify upper layer */
1663                                 *notification = SCTP_NOTIFY_ASSOC_UP;
1664                                 /*
1665                                  * since we did not send a HB make sure we
1666                                  * don't double things
1667                                  */
1668                                 net->hb_responded = 1;
1669                                 net->RTO = sctp_calculate_rto(stcb, asoc, net,
1670                                                               &cookie->time_entered,
1671                                                               sctp_align_unsafe_makecopy,
1672                                                               SCTP_RTT_FROM_NON_DATA);
1673
1674                                 if (stcb->asoc.sctp_autoclose_ticks &&
1675                                     (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1676                                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1677                                                          inp, stcb, NULL);
1678                                 }
1679                                 break;
1680                         default:
1681                                 /*
1682                                  * we're in the OPEN state (or beyond), so
1683                                  * peer must have simply lost the COOKIE-ACK
1684                                  */
1685                                 break;
1686                 }       /* end switch */
1687                 sctp_stop_all_cookie_timers(stcb);
1688                 /*
1689                  * We ignore the return code here.. not sure if we should
1690                  * somehow abort.. but we do have an existing asoc. This
1691                  * really should not fail.
1692                  */
1693                 if (sctp_load_addresses_from_init(stcb, m,
1694                                                   init_offset + sizeof(struct sctp_init_chunk),
1695                                                   initack_offset, src, dst, init_src)) {
1696                         if (how_indx < sizeof(asoc->cookie_how))
1697                                 asoc->cookie_how[how_indx] = 4;
1698                         return (NULL);
1699                 }
1700                 /* respond with a COOKIE-ACK */
1701                 sctp_toss_old_cookies(stcb, asoc);
1702                 sctp_send_cookie_ack(stcb);
1703                 if (how_indx < sizeof(asoc->cookie_how))
1704                         asoc->cookie_how[how_indx] = 5;
1705                 return (stcb);
1706         }
1707
1708         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1709             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1710             cookie->tie_tag_my_vtag == 0 &&
1711             cookie->tie_tag_peer_vtag == 0) {
1712                 /*
1713                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1714                  */
1715                 if (how_indx < sizeof(asoc->cookie_how))
1716                         asoc->cookie_how[how_indx] = 6;
1717                 return (NULL);
1718         }
1719         /* If nat support, and the below and stcb is established,
1720          * send back a ABORT(colliding state) if we are established.
1721          */
1722         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN)  &&
1723             (asoc->peer_supports_nat) &&
1724             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1725             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1726              (asoc->peer_vtag == 0)))) {
1727                 /* Special case - Peer's support nat. We may have
1728                  * two init's that we gave out the same tag on since
1729                  * one was not established.. i.e. we get INIT from host-1
1730                  * behind the nat and we respond tag-a, we get a INIT from
1731                  * host-2 behind the nat and we get tag-a again. Then we
1732                  * bring up host-1 (or 2's) assoc, Then comes the cookie
1733                  * from hsot-2 (or 1). Now we have colliding state. We must
1734                  * send an abort here with colliding state indication.
1735                  */
1736                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1737                 sctp_send_abort(m, iphlen,  src, dst, sh, 0, op_err,
1738 #if defined(__FreeBSD__)
1739                                 use_mflowid, mflowid,
1740 #endif
1741                                 vrf_id, port);
1742                 return (NULL);
1743         }
1744         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1745             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1746              (asoc->peer_vtag == 0))) {
1747                 /*
1748                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1749                  * should be ok, re-accept peer info
1750                  */
1751                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1752                         /* Extension of case C.
1753                          * If we hit this, then the random number
1754                          * generator returned the same vtag when we
1755                          * first sent our INIT-ACK and when we later sent
1756                          * our INIT. The side with the seq numbers that are
1757                          * different will be the one that normnally would
1758                          * have hit case C. This in effect "extends" our vtags
1759                          * in this collision case to be 64 bits. The same collision
1760                          * could occur aka you get both vtag and seq number the
1761                          * same twice in a row.. but is much less likely. If it
1762                          * did happen then we would proceed through and bring
1763                          * up the assoc.. we may end up with the wrong stream
1764                          * setup however.. which would be bad.. but there is
1765                          * no way to tell.. until we send on a stream that does
1766                          * not exist :-)
1767                          */
1768                         if (how_indx < sizeof(asoc->cookie_how))
1769                                 asoc->cookie_how[how_indx] = 7;
1770
1771                         return (NULL);
1772                 }
1773                 if (how_indx < sizeof(asoc->cookie_how))
1774                         asoc->cookie_how[how_indx] = 8;
1775                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_14);
1776                 sctp_stop_all_cookie_timers(stcb);
1777                 /*
1778                  * since we did not send a HB make sure we don't double
1779                  * things
1780                  */
1781                 net->hb_responded = 1;
1782                 if (stcb->asoc.sctp_autoclose_ticks &&
1783                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1784                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1785                                          NULL);
1786                 }
1787                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1788                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1789
1790                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1791                         /* Ok the peer probably discarded our
1792                          * data (if we echoed a cookie+data). So anything
1793                          * on the sent_queue should be marked for
1794                          * retransmit, we may not get something to
1795                          * kick us so it COULD still take a timeout
1796                          * to move these.. but it can't hurt to mark them.
1797                          */
1798                         struct sctp_tmit_chunk *chk;
1799                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1800                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1801                                         chk->sent = SCTP_DATAGRAM_RESEND;
1802                                         sctp_flight_size_decrease(chk);
1803                                         sctp_total_flight_decrease(stcb, chk);
1804                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1805                                         spec_flag++;
1806                                 }
1807                         }
1808
1809                 }
1810                 /* process the INIT info (peer's info) */
1811                 retval = sctp_process_init(init_cp, stcb);
1812                 if (retval < 0) {
1813                         if (how_indx < sizeof(asoc->cookie_how))
1814                                 asoc->cookie_how[how_indx] = 9;
1815                         return (NULL);
1816                 }
1817                 if (sctp_load_addresses_from_init(stcb, m,
1818                                                   init_offset + sizeof(struct sctp_init_chunk),
1819                                                   initack_offset, src, dst, init_src)) {
1820                         if (how_indx < sizeof(asoc->cookie_how))
1821                                 asoc->cookie_how[how_indx] = 10;
1822                         return (NULL);
1823                 }
1824                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1825                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1826                         *notification = SCTP_NOTIFY_ASSOC_UP;
1827
1828                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1829                              (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1830                             (inp->sctp_socket->so_qlimit == 0)) {
1831 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1832                                 struct socket *so;
1833 #endif
1834                                 stcb->sctp_ep->sctp_flags |=
1835                                         SCTP_PCB_FLAGS_CONNECTED;
1836 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1837                                 so = SCTP_INP_SO(stcb->sctp_ep);
1838                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1839                                 SCTP_TCB_UNLOCK(stcb);
1840                                 SCTP_SOCKET_LOCK(so, 1);
1841                                 SCTP_TCB_LOCK(stcb);
1842                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1843                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1844                                         SCTP_SOCKET_UNLOCK(so, 1);
1845                                         return (NULL);
1846                                 }
1847 #endif
1848                                 soisconnected(stcb->sctp_socket);
1849 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1850                                 SCTP_SOCKET_UNLOCK(so, 1);
1851 #endif
1852                         }
1853                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1854                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1855                         else
1856                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1857                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1858                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1859                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1860                 } else {
1861                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1862                 }
1863                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1864                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1865                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1866                                          stcb->sctp_ep, stcb, asoc->primary_destination);
1867                 }
1868                 sctp_stop_all_cookie_timers(stcb);
1869                 sctp_toss_old_cookies(stcb, asoc);
1870                 sctp_send_cookie_ack(stcb);
1871                 if (spec_flag) {
1872                         /* only if we have retrans set do we do this. What
1873                          * this call does is get only the COOKIE-ACK out
1874                          * and then when we return the normal call to
1875                          * sctp_chunk_output will get the retrans out
1876                          * behind this.
1877                          */
1878                         sctp_chunk_output(inp,stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1879                 }
1880                 if (how_indx < sizeof(asoc->cookie_how))
1881                         asoc->cookie_how[how_indx] = 11;
1882
1883                 return (stcb);
1884         }
1885         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1886              ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1887             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1888             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1889             cookie->tie_tag_peer_vtag != 0) {
1890                 struct sctpasochead *head;
1891 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1892                 struct socket *so;
1893 #endif
1894
1895                 if (asoc->peer_supports_nat) {
1896                         /* This is a gross gross hack.
1897                          * Just call the cookie_new code since we
1898                          * are allowing a duplicate association.
1899                          * I hope this works...
1900                          */
1901                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1902                                                         sh, cookie, cookie_len,
1903                                                         inp, netp, init_src,notification,
1904                                                         auth_skipped, auth_offset, auth_len,
1905 #if defined(__FreeBSD__)
1906                                                         use_mflowid, mflowid,
1907 #endif
1908                                                         vrf_id, port));
1909                 }
1910                 /*
1911                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1912                  */
1913                 /* temp code */
1914                 if (how_indx < sizeof(asoc->cookie_how))
1915                         asoc->cookie_how[how_indx] = 12;
1916                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_15);
1917                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_16);
1918
1919                 /* notify upper layer */
1920                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1921                 atomic_add_int(&stcb->asoc.refcnt, 1);
1922                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1923                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1924                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1925                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1926                 }
1927                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1928                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1929                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1930                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1931                 }
1932                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1933                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1934                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1935                                          stcb->sctp_ep, stcb, asoc->primary_destination);
1936
1937                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1938                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1939                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1940                 }
1941                 asoc->pre_open_streams =
1942                         ntohs(initack_cp->init.num_outbound_streams);
1943                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1944                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1945                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1946
1947                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1948
1949                 asoc->str_reset_seq_in = asoc->init_seq_number;
1950
1951                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1952                 if (asoc->mapping_array) {
1953                         memset(asoc->mapping_array, 0,
1954                                asoc->mapping_array_size);
1955                 }
1956                 if (asoc->nr_mapping_array) {
1957                         memset(asoc->nr_mapping_array, 0,
1958                             asoc->mapping_array_size);
1959                 }
1960                 SCTP_TCB_UNLOCK(stcb);
1961 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1962                 so = SCTP_INP_SO(stcb->sctp_ep);
1963                 SCTP_SOCKET_LOCK(so, 1);
1964 #endif
1965                 SCTP_INP_INFO_WLOCK();
1966                 SCTP_INP_WLOCK(stcb->sctp_ep);
1967                 SCTP_TCB_LOCK(stcb);
1968                 atomic_add_int(&stcb->asoc.refcnt, -1);
1969                 /* send up all the data */
1970                 SCTP_TCB_SEND_LOCK(stcb);
1971
1972                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1973                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1974                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1975 #if defined(SCTP_DETAILED_STR_STATS)
1976                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1977                                 asoc->strmout[i].abandoned_sent[j] = 0;
1978                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1979                         }
1980 #else
1981                         asoc->strmout[i].abandoned_sent[0] = 0;
1982                         asoc->strmout[i].abandoned_unsent[0] = 0;
1983 #endif
1984                         stcb->asoc.strmout[i].stream_no = i;
1985                         stcb->asoc.strmout[i].next_sequence_send = 0;
1986                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1987                 }
1988                 /* process the INIT-ACK info (my info) */
1989                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1990                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1991
1992                 /* pull from vtag hash */
1993                 LIST_REMOVE(stcb, sctp_asocs);
1994                 /* re-insert to new vtag position */
1995                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1996                                                                     SCTP_BASE_INFO(hashasocmark))];
1997                 /*
1998                  * put it in the bucket in the vtag hash of assoc's for the
1999                  * system
2000                  */
2001                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
2002
2003                 SCTP_TCB_SEND_UNLOCK(stcb);
2004                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
2005                 SCTP_INP_INFO_WUNLOCK();
2006 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2007                 SCTP_SOCKET_UNLOCK(so, 1);
2008 #endif
2009                 asoc->total_flight = 0;
2010                 asoc->total_flight_count = 0;
2011                 /* process the INIT info (peer's info) */
2012                 retval = sctp_process_init(init_cp, stcb);
2013                 if (retval < 0) {
2014                         if (how_indx < sizeof(asoc->cookie_how))
2015                                 asoc->cookie_how[how_indx] = 13;
2016
2017                         return (NULL);
2018                 }
2019                 /*
2020                  * since we did not send a HB make sure we don't double
2021                  * things
2022                  */
2023                 net->hb_responded = 1;
2024
2025                 if (sctp_load_addresses_from_init(stcb, m,
2026                                                   init_offset + sizeof(struct sctp_init_chunk),
2027                                                   initack_offset, src, dst, init_src)) {
2028                         if (how_indx < sizeof(asoc->cookie_how))
2029                                 asoc->cookie_how[how_indx] = 14;
2030
2031                         return (NULL);
2032                 }
2033                 /* respond with a COOKIE-ACK */
2034                 sctp_stop_all_cookie_timers(stcb);
2035                 sctp_toss_old_cookies(stcb, asoc);
2036                 sctp_send_cookie_ack(stcb);
2037                 if (how_indx < sizeof(asoc->cookie_how))
2038                         asoc->cookie_how[how_indx] = 15;
2039
2040                 return (stcb);
2041         }
2042         if (how_indx < sizeof(asoc->cookie_how))
2043                 asoc->cookie_how[how_indx] = 16;
2044         /* all other cases... */
2045         return (NULL);
2046 }
2047
2048
2049 /*
2050  * handle a state cookie for a new association m: input packet mbuf chain--
2051  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2052  * and the cookie signature does not exist offset: offset into mbuf to the
2053  * cookie-echo chunk length: length of the cookie chunk to: where the init
2054  * was from returns a new TCB
2055  */
2056 static struct sctp_tcb *
2057 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2058     struct sockaddr *src, struct sockaddr *dst,
2059     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2060     struct sctp_inpcb *inp, struct sctp_nets **netp,
2061     struct sockaddr *init_src, int *notification,
2062     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2063 #if defined(__FreeBSD__)
2064     uint8_t use_mflowid, uint32_t mflowid,
2065 #endif
2066     uint32_t vrf_id, uint16_t port)
2067 {
2068         struct sctp_tcb *stcb;
2069         struct sctp_init_chunk *init_cp, init_buf;
2070         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2071         union sctp_sockstore store;
2072         struct sctp_association *asoc;
2073         int init_offset, initack_offset, initack_limit;
2074         int retval;
2075         int error = 0;
2076         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2077 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2078         struct socket *so;
2079
2080         so = SCTP_INP_SO(inp);
2081 #endif
2082
2083         /*
2084          * find and validate the INIT chunk in the cookie (peer's info) the
2085          * INIT should start after the cookie-echo header struct (chunk
2086          * header, state cookie header struct)
2087          */
2088         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2089         init_cp = (struct sctp_init_chunk *)
2090             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2091             (uint8_t *) & init_buf);
2092         if (init_cp == NULL) {
2093                 /* could not pull a INIT chunk in cookie */
2094                 SCTPDBG(SCTP_DEBUG_INPUT1,
2095                         "process_cookie_new: could not pull INIT chunk hdr\n");
2096                 return (NULL);
2097         }
2098         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2099                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2100                 return (NULL);
2101         }
2102         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2103         /*
2104          * find and validate the INIT-ACK chunk in the cookie (my info) the
2105          * INIT-ACK follows the INIT chunk
2106          */
2107         initack_cp = (struct sctp_init_ack_chunk *)
2108             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2109             (uint8_t *) & initack_buf);
2110         if (initack_cp == NULL) {
2111                 /* could not pull INIT-ACK chunk in cookie */
2112                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2113                 return (NULL);
2114         }
2115         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2116                 return (NULL);
2117         }
2118         /*
2119          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2120          * "initack_limit" value.  This is because the chk_length field
2121          * includes the length of the cookie, but the cookie is omitted when
2122          * the INIT and INIT_ACK are tacked onto the cookie...
2123          */
2124         initack_limit = offset + cookie_len;
2125
2126         /*
2127          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2128          * and popluate
2129          */
2130
2131         /*
2132          * Here we do a trick, we set in NULL for the proc/thread argument. We
2133          * do this since in effect we only use the p argument when
2134          * the socket is unbound and we must do an implicit bind.
2135          * Since we are getting a cookie, we cannot be unbound.
2136          */
2137         stcb = sctp_aloc_assoc(inp, init_src, &error,
2138                                ntohl(initack_cp->init.initiate_tag), vrf_id,
2139 #if defined(__FreeBSD__) && __FreeBSD_version >= 500000
2140                                (struct thread *)NULL
2141 #elif defined(__Windows__)
2142                                (PKTHREAD)NULL
2143 #else
2144                                (struct proc *)NULL
2145 #endif
2146                                );
2147         if (stcb == NULL) {
2148                 struct mbuf *op_err;
2149
2150                 /* memory problem? */
2151                 SCTPDBG(SCTP_DEBUG_INPUT1,
2152                         "process_cookie_new: no room for another TCB!\n");
2153                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2154                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2155                                        src, dst, sh, op_err,
2156 #if defined(__FreeBSD__)
2157                                        use_mflowid, mflowid,
2158 #endif
2159                                        vrf_id, port);
2160                 return (NULL);
2161         }
2162         /* get the correct sctp_nets */
2163         if (netp)
2164                 *netp = sctp_findnet(stcb, init_src);
2165
2166         asoc = &stcb->asoc;
2167         /* get scope variables out of cookie */
2168         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2169         asoc->scope.site_scope = cookie->site_scope;
2170         asoc->scope.local_scope = cookie->local_scope;
2171         asoc->scope.loopback_scope = cookie->loopback_scope;
2172
2173 #if defined(__Userspace__)
2174         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2175             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal) ||
2176             (asoc->scope.conn_addr_legal != cookie->conn_addr_legal)) {
2177 #else
2178         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2179             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2180 #endif
2181                 struct mbuf *op_err;
2182
2183                 /*
2184                  * Houston we have a problem. The EP changed while the
2185                  * cookie was in flight. Only recourse is to abort the
2186                  * association.
2187                  */
2188                 atomic_add_int(&stcb->asoc.refcnt, 1);
2189                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2190                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2191                                        src, dst, sh, op_err,
2192 #if defined(__FreeBSD__)
2193                                        use_mflowid, mflowid,
2194 #endif
2195                                        vrf_id, port);
2196 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2197                 SCTP_TCB_UNLOCK(stcb);
2198                 SCTP_SOCKET_LOCK(so, 1);
2199                 SCTP_TCB_LOCK(stcb);
2200 #endif
2201                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2202                                       SCTP_FROM_SCTP_INPUT+SCTP_LOC_16);
2203 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2204                 SCTP_SOCKET_UNLOCK(so, 1);
2205 #endif
2206                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2207                 return (NULL);
2208         }
2209         /* process the INIT-ACK info (my info) */
2210         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2211         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2212         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2213         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2214         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2215         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2216         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2217         asoc->str_reset_seq_in = asoc->init_seq_number;
2218
2219         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2220
2221         /* process the INIT info (peer's info) */
2222         if (netp)
2223                 retval = sctp_process_init(init_cp, stcb);
2224         else
2225                 retval = 0;
2226         if (retval < 0) {
2227                 atomic_add_int(&stcb->asoc.refcnt, 1);
2228 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2229                 SCTP_TCB_UNLOCK(stcb);
2230                 SCTP_SOCKET_LOCK(so, 1);
2231                 SCTP_TCB_LOCK(stcb);
2232 #endif
2233                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_16);
2234 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2235                 SCTP_SOCKET_UNLOCK(so, 1);
2236 #endif
2237                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2238                 return (NULL);
2239         }
2240         /* load all addresses */
2241         if (sctp_load_addresses_from_init(stcb, m,
2242             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2243             src, dst, init_src)) {
2244                 atomic_add_int(&stcb->asoc.refcnt, 1);
2245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2246                 SCTP_TCB_UNLOCK(stcb);
2247                 SCTP_SOCKET_LOCK(so, 1);
2248                 SCTP_TCB_LOCK(stcb);
2249 #endif
2250                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_17);
2251 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2252                 SCTP_SOCKET_UNLOCK(so, 1);
2253 #endif
2254                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2255                 return (NULL);
2256         }
2257         /*
2258          * verify any preceding AUTH chunk that was skipped
2259          */
2260         /* pull the local authentication parameters from the cookie/init-ack */
2261         sctp_auth_get_cookie_params(stcb, m,
2262             initack_offset + sizeof(struct sctp_init_ack_chunk),
2263             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2264         if (auth_skipped) {
2265                 struct sctp_auth_chunk *auth;
2266
2267                 auth = (struct sctp_auth_chunk *)
2268                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2269                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2270                         /* auth HMAC failed, dump the assoc and packet */
2271                         SCTPDBG(SCTP_DEBUG_AUTH1,
2272                                 "COOKIE-ECHO: AUTH failed\n");
2273                         atomic_add_int(&stcb->asoc.refcnt, 1);
2274 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2275                         SCTP_TCB_UNLOCK(stcb);
2276                         SCTP_SOCKET_LOCK(so, 1);
2277                         SCTP_TCB_LOCK(stcb);
2278 #endif
2279                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_18);
2280 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2281                         SCTP_SOCKET_UNLOCK(so, 1);
2282 #endif
2283                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2284                         return (NULL);
2285                 } else {
2286                         /* remaining chunks checked... good to go */
2287                         stcb->asoc.authenticated = 1;
2288                 }
2289         }
2290         /* update current state */
2291         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2292         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2293         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2294                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2295                                  stcb->sctp_ep, stcb, asoc->primary_destination);
2296         }
2297         sctp_stop_all_cookie_timers(stcb);
2298         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2299         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2300
2301         /*
2302          * if we're doing ASCONFs, check to see if we have any new local
2303          * addresses that need to get added to the peer (eg. addresses
2304          * changed while cookie echo in flight).  This needs to be done
2305          * after we go to the OPEN state to do the correct asconf
2306          * processing. else, make sure we have the correct addresses in our
2307          * lists
2308          */
2309
2310         /* warning, we re-use sin, sin6, sa_store here! */
2311         /* pull in local_address (our "from" address) */
2312         switch (cookie->laddr_type) {
2313 #ifdef INET
2314         case SCTP_IPV4_ADDRESS:
2315                 /* source addr is IPv4 */
2316                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2317                 store.sin.sin_family = AF_INET;
2318 #ifdef HAVE_SIN_LEN
2319                 store.sin.sin_len = sizeof(struct sockaddr_in);
2320 #endif
2321                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2322                 break;
2323 #endif
2324 #ifdef INET6
2325         case SCTP_IPV6_ADDRESS:
2326                 /* source addr is IPv6 */
2327                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2328                 store.sin6.sin6_family = AF_INET6;
2329 #ifdef HAVE_SIN6_LEN
2330                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2331 #endif
2332                 store.sin6.sin6_scope_id = cookie->scope_id;
2333                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2334                 break;
2335 #endif
2336 #if defined(__Userspace__)
2337         case SCTP_CONN_ADDRESS:
2338                 /* source addr is conn */
2339                 memset(&store.sconn, 0, sizeof(struct sockaddr_conn));
2340                 store.sconn.sconn_family = AF_CONN;
2341 #ifdef HAVE_SCONN_LEN
2342                 store.sconn.sconn_len = sizeof(struct sockaddr_conn);
2343 #endif
2344                 memcpy(&store.sconn.sconn_addr, cookie->laddress, sizeof(void *));
2345                 break;
2346 #endif
2347         default:
2348                 atomic_add_int(&stcb->asoc.refcnt, 1);
2349 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2350                 SCTP_TCB_UNLOCK(stcb);
2351                 SCTP_SOCKET_LOCK(so, 1);
2352                 SCTP_TCB_LOCK(stcb);
2353 #endif
2354                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_19);
2355 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2356                 SCTP_SOCKET_UNLOCK(so, 1);
2357 #endif
2358                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2359                 return (NULL);
2360         }
2361
2362         /* set up to notify upper layer */
2363         *notification = SCTP_NOTIFY_ASSOC_UP;
2364         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2365             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2366             (inp->sctp_socket->so_qlimit == 0)) {
2367                 /*
2368                  * This is an endpoint that called connect() how it got a
2369                  * cookie that is NEW is a bit of a mystery. It must be that
2370                  * the INIT was sent, but before it got there.. a complete
2371                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2372                  * should have went to the other code.. not here.. oh well..
2373                  * a bit of protection is worth having..
2374                  */
2375                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2376 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2377                 atomic_add_int(&stcb->asoc.refcnt, 1);
2378                 SCTP_TCB_UNLOCK(stcb);
2379                 SCTP_SOCKET_LOCK(so, 1);
2380                 SCTP_TCB_LOCK(stcb);
2381                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2382                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2383                         SCTP_SOCKET_UNLOCK(so, 1);
2384                         return (NULL);
2385                 }
2386 #endif
2387                 soisconnected(stcb->sctp_socket);
2388 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2389                 SCTP_SOCKET_UNLOCK(so, 1);
2390 #endif
2391         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2392             (inp->sctp_socket->so_qlimit)) {
2393                 /*
2394                  * We don't want to do anything with this one. Since it is
2395                  * the listening guy. The timer will get started for
2396                  * accepted connections in the caller.
2397                  */
2398                 ;
2399         }
2400         /* since we did not send a HB make sure we don't double things */
2401         if ((netp) && (*netp))
2402                 (*netp)->hb_responded = 1;
2403
2404         if (stcb->asoc.sctp_autoclose_ticks &&
2405             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2406                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2407         }
2408         /* calculate the RTT */
2409         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2410         if ((netp) && (*netp)) {
2411                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2412                                                   &cookie->time_entered, sctp_align_unsafe_makecopy,
2413                                                   SCTP_RTT_FROM_NON_DATA);
2414         }
2415         /* respond with a COOKIE-ACK */
2416         sctp_send_cookie_ack(stcb);
2417
2418         /*
2419          * check the address lists for any ASCONFs that need to be sent
2420          * AFTER the cookie-ack is sent
2421          */
2422         sctp_check_address_list(stcb, m,
2423             initack_offset + sizeof(struct sctp_init_ack_chunk),
2424             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2425             &store.sa, cookie->local_scope, cookie->site_scope,
2426             cookie->ipv4_scope, cookie->loopback_scope);
2427
2428
2429         return (stcb);
2430 }
2431
2432 /*
2433  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2434  * we NEED to make sure we are not already using the vtag. If so we
2435  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2436         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2437                                                             SCTP_BASE_INFO(hashasocmark))];
2438         LIST_FOREACH(stcb, head, sctp_asocs) {
2439                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2440                        -- SEND ABORT - TRY AGAIN --
2441                 }
2442         }
2443 */
2444
2445 /*
2446  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2447  * existing (non-NULL) TCB
2448  */
2449 static struct mbuf *
2450 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2451     struct sockaddr *src, struct sockaddr *dst,
2452     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2453     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2454     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2455     struct sctp_tcb **locked_tcb,
2456 #if defined(__FreeBSD__)
2457     uint8_t use_mflowid, uint32_t mflowid,
2458 #endif
2459     uint32_t vrf_id, uint16_t port)
2460 {
2461         struct sctp_state_cookie *cookie;
2462         struct sctp_tcb *l_stcb = *stcb;
2463         struct sctp_inpcb *l_inp;
2464         struct sockaddr *to;
2465         struct sctp_pcb *ep;
2466         struct mbuf *m_sig;
2467         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2468         uint8_t *sig;
2469         uint8_t cookie_ok = 0;
2470         unsigned int sig_offset, cookie_offset;
2471         unsigned int cookie_len;
2472         struct timeval now;
2473         struct timeval time_expires;
2474         int notification = 0;
2475         struct sctp_nets *netl;
2476         int had_a_existing_tcb = 0;
2477         int send_int_conf = 0;
2478 #ifdef INET
2479         struct sockaddr_in sin;
2480 #endif
2481 #ifdef INET6
2482         struct sockaddr_in6 sin6;
2483 #endif
2484 #if defined(__Userspace__)
2485         struct sockaddr_conn sconn;
2486 #endif
2487
2488         SCTPDBG(SCTP_DEBUG_INPUT2,
2489                 "sctp_handle_cookie: handling COOKIE-ECHO\n");
2490
2491         if (inp_p == NULL) {
2492                 return (NULL);
2493         }
2494         cookie = &cp->cookie;
2495         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2496         cookie_len = ntohs(cp->ch.chunk_length);
2497
2498         if ((cookie->peerport != sh->src_port) &&
2499             (cookie->myport != sh->dest_port) &&
2500             (cookie->my_vtag != sh->v_tag)) {
2501                 /*
2502                  * invalid ports or bad tag.  Note that we always leave the
2503                  * v_tag in the header in network order and when we stored
2504                  * it in the my_vtag slot we also left it in network order.
2505                  * This maintains the match even though it may be in the
2506                  * opposite byte order of the machine :->
2507                  */
2508                 return (NULL);
2509         }
2510         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2511             sizeof(struct sctp_init_chunk) +
2512             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2513                 /* cookie too small */
2514                 return (NULL);
2515         }
2516         /*
2517          * split off the signature into its own mbuf (since it should not be
2518          * calculated in the sctp_hmac_m() call).
2519          */
2520         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2521         m_sig = m_split(m, sig_offset, M_NOWAIT);
2522         if (m_sig == NULL) {
2523                 /* out of memory or ?? */
2524                 return (NULL);
2525         }
2526 #ifdef SCTP_MBUF_LOGGING
2527         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2528                 struct mbuf *mat;
2529
2530                 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) {
2531                         if (SCTP_BUF_IS_EXTENDED(mat)) {
2532                                 sctp_log_mb(mat, SCTP_MBUF_SPLIT);
2533                         }
2534                 }
2535         }
2536 #endif
2537
2538         /*
2539          * compute the signature/digest for the cookie
2540          */
2541         ep = &(*inp_p)->sctp_ep;
2542         l_inp = *inp_p;
2543         if (l_stcb) {
2544                 SCTP_TCB_UNLOCK(l_stcb);
2545         }
2546         SCTP_INP_RLOCK(l_inp);
2547         if (l_stcb) {
2548                 SCTP_TCB_LOCK(l_stcb);
2549         }
2550         /* which cookie is it? */
2551         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2552             (ep->current_secret_number != ep->last_secret_number)) {
2553                 /* it's the old cookie */
2554                 (void)sctp_hmac_m(SCTP_HMAC,
2555                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2556                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2557         } else {
2558                 /* it's the current cookie */
2559                 (void)sctp_hmac_m(SCTP_HMAC,
2560                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2561                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2562         }
2563         /* get the signature */
2564         SCTP_INP_RUNLOCK(l_inp);
2565         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2566         if (sig == NULL) {
2567                 /* couldn't find signature */
2568                 sctp_m_freem(m_sig);
2569                 return (NULL);
2570         }
2571         /* compare the received digest with the computed digest */
2572         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2573                 /* try the old cookie? */
2574                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2575                     (ep->current_secret_number != ep->last_secret_number)) {
2576                         /* compute digest with old */
2577                         (void)sctp_hmac_m(SCTP_HMAC,
2578                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2579                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2580                         /* compare */
2581                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2582                                 cookie_ok = 1;
2583                 }
2584         } else {
2585                 cookie_ok = 1;
2586         }
2587
2588         /*
2589          * Now before we continue we must reconstruct our mbuf so that
2590          * normal processing of any other chunks will work.
2591          */
2592         {
2593                 struct mbuf *m_at;
2594
2595                 m_at = m;
2596                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2597                         m_at = SCTP_BUF_NEXT(m_at);
2598                 }
2599                 SCTP_BUF_NEXT(m_at) = m_sig;
2600         }
2601
2602         if (cookie_ok == 0) {
2603                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2604                 SCTPDBG(SCTP_DEBUG_INPUT2,
2605                         "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2606                         (uint32_t) offset, cookie_offset, sig_offset);
2607                 return (NULL);
2608         }
2609
2610         /*
2611          * check the cookie timestamps to be sure it's not stale
2612          */
2613         (void)SCTP_GETTIME_TIMEVAL(&now);
2614         /* Expire time is in Ticks, so we convert to seconds */
2615         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2616         time_expires.tv_usec = cookie->time_entered.tv_usec;
2617         /* TODO sctp_constants.h needs alternative time macros when
2618          *  _KERNEL is undefined.
2619          */
2620 #ifndef __FreeBSD__
2621         if (timercmp(&now, &time_expires, >))
2622 #else
2623         if (timevalcmp(&now, &time_expires, >))
2624 #endif
2625         {
2626                 /* cookie is stale! */
2627                 struct mbuf *op_err;
2628                 struct sctp_stale_cookie_msg *scm;
2629                 uint32_t tim;
2630                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg),
2631                                                0, M_NOWAIT, 1, MT_DATA);
2632                 if (op_err == NULL) {
2633                         /* FOOBAR */
2634                         return (NULL);
2635                 }
2636                 /* Set the len */
2637                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg);
2638                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
2639                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
2640                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
2641                     (sizeof(uint32_t))));
2642                 /* seconds to usec */
2643                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2644                 /* add in usec */
2645                 if (tim == 0)
2646                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2647                 scm->time_usec = htonl(tim);
2648                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2649 #if defined(__FreeBSD__)
2650                                    use_mflowid, mflowid,
2651 #endif
2652                                    vrf_id, port);
2653                 return (NULL);
2654         }
2655         /*
2656          * Now we must see with the lookup address if we have an existing
2657          * asoc. This will only happen if we were in the COOKIE-WAIT state
2658          * and a INIT collided with us and somewhere the peer sent the
2659          * cookie on another address besides the single address our assoc
2660          * had for him. In this case we will have one of the tie-tags set at
2661          * least AND the address field in the cookie can be used to look it
2662          * up.
2663          */
2664         to = NULL;
2665         switch (cookie->addr_type) {
2666 #ifdef INET6
2667         case SCTP_IPV6_ADDRESS:
2668                 memset(&sin6, 0, sizeof(sin6));
2669                 sin6.sin6_family = AF_INET6;
2670 #ifdef HAVE_SIN6_LEN
2671                 sin6.sin6_len = sizeof(sin6);
2672 #endif
2673                 sin6.sin6_port = sh->src_port;
2674                 sin6.sin6_scope_id = cookie->scope_id;
2675                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2676                     sizeof(sin6.sin6_addr.s6_addr));
2677                 to = (struct sockaddr *)&sin6;
2678                 break;
2679 #endif
2680 #ifdef INET
2681         case SCTP_IPV4_ADDRESS:
2682                 memset(&sin, 0, sizeof(sin));
2683                 sin.sin_family = AF_INET;
2684 #ifdef HAVE_SIN_LEN
2685                 sin.sin_len = sizeof(sin);
2686 #endif
2687                 sin.sin_port = sh->src_port;
2688                 sin.sin_addr.s_addr = cookie->address[0];
2689                 to = (struct sockaddr *)&sin;
2690                 break;
2691 #endif
2692 #if defined(__Userspace__)
2693         case SCTP_CONN_ADDRESS:
2694                 memset(&sconn, 0, sizeof(struct sockaddr_conn));
2695                 sconn.sconn_family = AF_CONN;
2696 #ifdef HAVE_SCONN_LEN
2697                 sconn.sconn_len = sizeof(struct sockaddr_conn);
2698 #endif
2699                 sconn.sconn_port = sh->src_port;
2700                 memcpy(&sconn.sconn_addr, cookie->address, sizeof(void *));
2701                 to = (struct sockaddr *)&sconn;
2702                 break;
2703 #endif
2704         default:
2705                 /* This should not happen */
2706                 return (NULL);
2707         }
2708         if ((*stcb == NULL) && to) {
2709                 /* Yep, lets check */
2710                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2711                 if (*stcb == NULL) {
2712                         /*
2713                          * We should have only got back the same inp. If we
2714                          * got back a different ep we have a problem. The
2715                          * original findep got back l_inp and now
2716                          */
2717                         if (l_inp != *inp_p) {
2718                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2719                         }
2720                 } else {
2721                         if (*locked_tcb == NULL) {
2722                                 /* In this case we found the assoc only
2723                                  * after we locked the create lock. This means
2724                                  * we are in a colliding case and we must make
2725                                  * sure that we unlock the tcb if its one of the
2726                                  * cases where we throw away the incoming packets.
2727                                  */
2728                                 *locked_tcb = *stcb;
2729
2730                                 /* We must also increment the inp ref count
2731                                  * since the ref_count flags was set when we
2732                                  * did not find the TCB, now we found it which
2733                                  * reduces the refcount.. we must raise it back
2734                                  * out to balance it all :-)
2735                                  */
2736                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2737                                 if ((*stcb)->sctp_ep != l_inp) {
2738                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2739                                                     (void *)(*stcb)->sctp_ep, (void *)l_inp);
2740                                 }
2741                         }
2742                 }
2743         }
2744         if (to == NULL) {
2745                 return (NULL);
2746         }
2747
2748         cookie_len -= SCTP_SIGNATURE_SIZE;
2749         if (*stcb == NULL) {
2750                 /* this is the "normal" case... get a new TCB */
2751                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2752                                                 cookie, cookie_len, *inp_p,
2753                                                 netp, to, &notification,
2754                                                 auth_skipped, auth_offset, auth_len,
2755 #if defined(__FreeBSD__)
2756                                                 use_mflowid, mflowid,
2757 #endif
2758                                                 vrf_id, port);
2759         } else {
2760                 /* this is abnormal... cookie-echo on existing TCB */
2761                 had_a_existing_tcb = 1;
2762                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2763                                                      src, dst, sh,
2764                                                      cookie, cookie_len, *inp_p, *stcb, netp, to,
2765                                                      &notification, auth_skipped, auth_offset, auth_len,
2766 #if defined(__FreeBSD__)
2767                                                      use_mflowid, mflowid,
2768 #endif
2769                                                      vrf_id, port);
2770         }
2771
2772         if (*stcb == NULL) {
2773                 /* still no TCB... must be bad cookie-echo */
2774                 return (NULL);
2775         }
2776 #if defined(__FreeBSD__)
2777         if ((*netp != NULL) && (use_mflowid != 0)) {
2778                 (*netp)->flowid = mflowid;
2779 #ifdef INVARIANTS
2780                 (*netp)->flowidset = 1;
2781 #endif
2782         }
2783 #endif
2784         /*
2785          * Ok, we built an association so confirm the address we sent the
2786          * INIT-ACK to.
2787          */
2788         netl = sctp_findnet(*stcb, to);
2789         /*
2790          * This code should in theory NOT run but
2791          */
2792         if (netl == NULL) {
2793                 /* TSNH! Huh, why do I need to add this address here? */
2794                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2795                         return (NULL);
2796                 }
2797                 netl = sctp_findnet(*stcb, to);
2798         }
2799         if (netl) {
2800                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2801                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2802                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2803                             netl);
2804                         send_int_conf = 1;
2805                 }
2806         }
2807         sctp_start_net_timers(*stcb);
2808         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2809                 if (!had_a_existing_tcb ||
2810                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2811                         /*
2812                          * If we have a NEW cookie or the connect never
2813                          * reached the connected state during collision we
2814                          * must do the TCP accept thing.
2815                          */
2816                         struct socket *so, *oso;
2817                         struct sctp_inpcb *inp;
2818
2819                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2820                                 /*
2821                                  * For a restart we will keep the same
2822                                  * socket, no need to do anything. I THINK!!
2823                                  */
2824                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2825                                 if (send_int_conf) {
2826                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2827                                                         (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2828                                 }
2829                                 return (m);
2830                         }
2831                         oso = (*inp_p)->sctp_socket;
2832 #if (defined(__FreeBSD__) && __FreeBSD_version < 700000)
2833                         /*
2834                          * We do this to keep the sockets side happy during
2835                          * the sonewcon ONLY.
2836                          */
2837                         NET_LOCK_GIANT();
2838 #endif
2839                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2840                         SCTP_TCB_UNLOCK((*stcb));
2841 #if defined(__FreeBSD__) && __FreeBSD_version >= 801000
2842                         CURVNET_SET(oso->so_vnet);
2843 #endif
2844 #if defined(__APPLE__)
2845                         SCTP_SOCKET_LOCK(oso, 1);
2846 #endif
2847                         so = sonewconn(oso, 0
2848 #if defined(__APPLE__)
2849                             ,NULL
2850 #endif
2851 #ifdef __Panda__
2852                              ,NULL , (*inp_p)->def_vrf_id
2853 #endif
2854                             );
2855 #if (defined(__FreeBSD__) && __FreeBSD_version < 700000)
2856                         NET_UNLOCK_GIANT();
2857 #endif
2858 #if defined(__APPLE__)
2859                         SCTP_SOCKET_UNLOCK(oso, 1);
2860 #endif
2861 #if defined(__FreeBSD__) && __FreeBSD_version >= 801000
2862                         CURVNET_RESTORE();
2863 #endif
2864                         SCTP_TCB_LOCK((*stcb));
2865                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2866
2867                         if (so == NULL) {
2868                                 struct mbuf *op_err;
2869 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2870                                 struct socket *pcb_so;
2871 #endif
2872                                 /* Too many sockets */
2873                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2874                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2875                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2876                                                        src, dst, sh, op_err,
2877 #if defined(__FreeBSD__)
2878                                                        use_mflowid, mflowid,
2879 #endif
2880                                                        vrf_id, port);
2881 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2882                                 pcb_so = SCTP_INP_SO(*inp_p);
2883                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2884                                 SCTP_TCB_UNLOCK((*stcb));
2885                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2886                                 SCTP_TCB_LOCK((*stcb));
2887                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2888 #endif
2889                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_20);
2890 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2891                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2892 #endif
2893                                 return (NULL);
2894                         }
2895                         inp = (struct sctp_inpcb *)so->so_pcb;
2896                         SCTP_INP_INCR_REF(inp);
2897                         /*
2898                          * We add the unbound flag here so that
2899                          * if we get an soabort() before we get the
2900                          * move_pcb done, we will properly cleanup.
2901                          */
2902                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2903                             SCTP_PCB_FLAGS_CONNECTED |
2904                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2905                             SCTP_PCB_FLAGS_UNBOUND |
2906                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2907                             SCTP_PCB_FLAGS_DONT_WAKE);
2908                         inp->sctp_features = (*inp_p)->sctp_features;
2909                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2910                         inp->sctp_socket = so;
2911                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2912                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2913                         inp->ecn_supported = (*inp_p)->ecn_supported;
2914                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2915                         inp->auth_supported = (*inp_p)->auth_supported;
2916                         inp->asconf_supported = (*inp_p)->asconf_supported;
2917                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2918                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2919                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2920                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2921                         inp->sctp_context = (*inp_p)->sctp_context;
2922                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2923                         inp->inp_starting_point_for_iterator = NULL;
2924 #if defined(__Userspace__)
2925                         inp->ulp_info = (*inp_p)->ulp_info;
2926                         inp->recv_callback = (*inp_p)->recv_callback;
2927                         inp->send_callback = (*inp_p)->send_callback;
2928                         inp->send_sb_threshold = (*inp_p)->send_sb_threshold;
2929 #endif
2930                         /*
2931                          * copy in the authentication parameters from the
2932                          * original endpoint
2933                          */
2934                         if (inp->sctp_ep.local_hmacs)
2935                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2936                         inp->sctp_ep.local_hmacs =
2937                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2938                         if (inp->sctp_ep.local_auth_chunks)
2939                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2940                         inp->sctp_ep.local_auth_chunks =
2941                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2942
2943                         /*
2944                          * Now we must move it from one hash table to
2945                          * another and get the tcb in the right place.
2946                          */
2947
2948                         /* This is where the one-2-one socket is put into
2949                          * the accept state waiting for the accept!
2950                          */
2951                         if (*stcb) {
2952                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2953                         }
2954                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2955
2956                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2957                         SCTP_TCB_UNLOCK((*stcb));
2958
2959 #if defined(__FreeBSD__)
2960                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2961                             0);
2962 #else
2963                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, M_NOWAIT);
2964 #endif
2965                         SCTP_TCB_LOCK((*stcb));
2966                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2967
2968
2969                         /* now we must check to see if we were aborted while
2970                          * the move was going on and the lock/unlock happened.
2971                          */
2972                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2973                                 /* yep it was, we leave the
2974                                  * assoc attached to the socket since
2975                                  * the sctp_inpcb_free() call will send
2976                                  * an abort for us.
2977                                  */
2978                                 SCTP_INP_DECR_REF(inp);
2979                                 return (NULL);
2980                         }
2981                         SCTP_INP_DECR_REF(inp);
2982                         /* Switch over to the new guy */
2983                         *inp_p = inp;
2984                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2985                         if (send_int_conf) {
2986                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2987                                                 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2988                         }
2989
2990                         /* Pull it from the incomplete queue and wake the guy */
2991 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2992                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2993                         SCTP_TCB_UNLOCK((*stcb));
2994                         SCTP_SOCKET_LOCK(so, 1);
2995 #endif
2996                         soisconnected(so);
2997 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2998                         SCTP_TCB_LOCK((*stcb));
2999                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
3000                         SCTP_SOCKET_UNLOCK(so, 1);
3001 #endif
3002                         return (m);
3003                 }
3004         }
3005         if (notification) {
3006                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3007         }
3008         if (send_int_conf) {
3009                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
3010                                 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
3011         }
3012         return (m);
3013 }
3014
3015 static void
3016 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
3017     struct sctp_tcb *stcb, struct sctp_nets *net)
3018 {
3019         /* cp must not be used, others call this without a c-ack :-) */
3020         struct sctp_association *asoc;
3021
3022         SCTPDBG(SCTP_DEBUG_INPUT2,
3023                 "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
3024         if ((stcb == NULL) || (net == NULL)) {
3025                 return;
3026         }
3027
3028         asoc = &stcb->asoc;
3029
3030         sctp_stop_all_cookie_timers(stcb);
3031         /* process according to association state */
3032         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
3033                 /* state change only needed when I am in right state */
3034                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
3035                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
3036                 sctp_start_net_timers(stcb);
3037                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
3038                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
3039                                          stcb->sctp_ep, stcb, asoc->primary_destination);
3040
3041                 }
3042                 /* update RTO */
3043                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
3044                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
3045                 if (asoc->overall_error_count == 0) {
3046                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
3047                                                      &asoc->time_entered, sctp_align_safe_nocopy,
3048                                                       SCTP_RTT_FROM_NON_DATA);
3049                 }
3050                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
3051                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3052                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
3053                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
3054 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3055                         struct socket *so;
3056
3057 #endif
3058                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
3059 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3060                         so = SCTP_INP_SO(stcb->sctp_ep);
3061                         atomic_add_int(&stcb->asoc.refcnt, 1);
3062                         SCTP_TCB_UNLOCK(stcb);
3063                         SCTP_SOCKET_LOCK(so, 1);
3064                         SCTP_TCB_LOCK(stcb);
3065                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3066 #endif
3067                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
3068                                 soisconnected(stcb->sctp_socket);
3069                         }
3070 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3071                         SCTP_SOCKET_UNLOCK(so, 1);
3072 #endif
3073                 }
3074                 /*
3075                  * since we did not send a HB make sure we don't double
3076                  * things
3077                  */
3078                 net->hb_responded = 1;
3079
3080                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
3081                         /* We don't need to do the asconf thing,
3082                          * nor hb or autoclose if the socket is closed.
3083                          */
3084                         goto closed_socket;
3085                 }
3086
3087                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
3088                     stcb, net);
3089
3090
3091                 if (stcb->asoc.sctp_autoclose_ticks &&
3092                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
3093                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
3094                             stcb->sctp_ep, stcb, NULL);
3095                 }
3096                 /*
3097                  * send ASCONF if parameters are pending and ASCONFs are
3098                  * allowed (eg. addresses changed when init/cookie echo were
3099                  * in flight)
3100                  */
3101                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
3102                     (stcb->asoc.asconf_supported == 1) &&
3103                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
3104 #ifdef SCTP_TIMER_BASED_ASCONF
3105                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
3106                                          stcb->sctp_ep, stcb,
3107                                          stcb->asoc.primary_destination);
3108 #else
3109                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3110                                          SCTP_ADDR_NOT_LOCKED);
3111 #endif
3112                 }
3113         }
3114 closed_socket:
3115         /* Toss the cookie if I can */
3116         sctp_toss_old_cookies(stcb, asoc);
3117         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3118                 /* Restart the timer if we have pending data */
3119                 struct sctp_tmit_chunk *chk;
3120
3121                 chk = TAILQ_FIRST(&asoc->sent_queue);
3122                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3123         }
3124 }
3125
3126 static void
3127 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3128                      struct sctp_tcb *stcb)
3129 {
3130         struct sctp_nets *net;
3131         struct sctp_tmit_chunk *lchk;
3132         struct sctp_ecne_chunk bkup;
3133         uint8_t override_bit;
3134         uint32_t tsn, window_data_tsn;
3135         int len;
3136         unsigned int pkt_cnt;
3137
3138         len = ntohs(cp->ch.chunk_length);
3139         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3140             (len != sizeof(struct old_sctp_ecne_chunk))) {
3141                 return;
3142         }
3143         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3144                 /* Its the old format */
3145                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3146                 bkup.num_pkts_since_cwr = htonl(1);
3147                 cp = &bkup;
3148         }
3149         SCTP_STAT_INCR(sctps_recvecne);
3150         tsn = ntohl(cp->tsn);
3151         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3152         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3153         if (lchk == NULL) {
3154                 window_data_tsn = stcb->asoc.sending_seq - 1;
3155         } else {
3156                 window_data_tsn = lchk->rec.data.TSN_seq;
3157         }
3158
3159         /* Find where it was sent to if possible. */
3160         net = NULL;
3161         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3162                 if (lchk->rec.data.TSN_seq == tsn) {
3163                         net = lchk->whoTo;
3164                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3165                         break;
3166                 }
3167                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3168                         break;
3169                 }
3170         }
3171         if (net == NULL) {
3172                 /*
3173                  * What to do. A previous send of a
3174                  * CWR was possibly lost. See how old it is, we
3175                  * may have it marked on the actual net.
3176                  */
3177                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3178                         if (tsn == net->last_cwr_tsn) {
3179                                 /* Found him, send it off */
3180                                 break;
3181                         }
3182                 }
3183                 if (net == NULL) {
3184                         /*
3185                          * If we reach here, we need to send a special
3186                          * CWR that says hey, we did this a long time
3187                          * ago and you lost the response.
3188                          */
3189                         net = TAILQ_FIRST(&stcb->asoc.nets);
3190                         if (net == NULL) {
3191                                 /* TSNH */
3192                                 return;
3193                         }
3194                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3195                 } else {
3196                         override_bit = 0;
3197                 }
3198         } else {
3199                 override_bit = 0;
3200         }
3201         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3202             ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3203                 /* JRS - Use the congestion control given in the pluggable CC module */
3204                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3205                 /*
3206                  * We reduce once every RTT. So we will only lower cwnd at
3207                  * the next sending seq i.e. the window_data_tsn
3208                  */
3209                 net->cwr_window_tsn = window_data_tsn;
3210                 net->ecn_ce_pkt_cnt += pkt_cnt;
3211                 net->lost_cnt = pkt_cnt;
3212                 net->last_cwr_tsn = tsn;
3213         } else {
3214                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3215                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3216                     ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3217                         /*
3218                          * Another loss in the same window update how
3219                          * many marks/packets lost we have had.
3220                          */
3221                         int cnt = 1;
3222                         if (pkt_cnt > net->lost_cnt) {
3223                                 /* Should be the case */
3224                                 cnt = (pkt_cnt - net->lost_cnt);
3225                                 net->ecn_ce_pkt_cnt += cnt;
3226                         }
3227                         net->lost_cnt = pkt_cnt;
3228                         net->last_cwr_tsn = tsn;
3229                         /*
3230                          * Most CC functions will ignore this call, since we are in-window
3231                          * yet of the initial CE the peer saw.
3232                          */
3233                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3234                 }
3235         }
3236         /*
3237          * We always send a CWR this way if our previous one was lost our
3238          * peer will get an update, or if it is not time again to reduce we
3239          * still get the cwr to the peer. Note we set the override when we
3240          * could not find the TSN on the chunk or the destination network.
3241          */
3242         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3243 }
3244
3245 static void
3246 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3247 {
3248         /*
3249          * Here we get a CWR from the peer. We must look in the outqueue and
3250          * make sure that we have a covered ECNE in the control chunk part.
3251          * If so remove it.
3252          */
3253         struct sctp_tmit_chunk *chk;
3254         struct sctp_ecne_chunk *ecne;
3255         int override;
3256         uint32_t cwr_tsn;
3257         cwr_tsn = ntohl(cp->tsn);
3258
3259         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3260         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3261                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3262                         continue;
3263                 }
3264                 if ((override == 0) && (chk->whoTo != net)) {
3265                         /* Must be from the right src unless override is set */
3266                         continue;
3267                 }
3268                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3269                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3270                         /* this covers this ECNE, we can remove it */
3271                         stcb->asoc.ecn_echo_cnt_onq--;
3272                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3273                             sctp_next);
3274                         if (chk->data) {
3275                                 sctp_m_freem(chk->data);
3276                                 chk->data = NULL;
3277                         }
3278                         stcb->asoc.ctrl_queue_cnt--;
3279                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3280                         if (override == 0) {
3281                                 break;
3282                         }
3283                 }
3284         }
3285 }
3286
3287 static void
3288 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3289     struct sctp_tcb *stcb, struct sctp_nets *net)
3290 {
3291         struct sctp_association *asoc;
3292 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3293         struct socket *so;
3294 #endif
3295
3296         SCTPDBG(SCTP_DEBUG_INPUT2,
3297                 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3298         if (stcb == NULL)
3299                 return;
3300
3301         asoc = &stcb->asoc;
3302         /* process according to association state */
3303         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3304                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3305                 SCTPDBG(SCTP_DEBUG_INPUT2,
3306                         "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3307                 SCTP_TCB_UNLOCK(stcb);
3308                 return;
3309         }
3310         /* notify upper layer protocol */
3311         if (stcb->sctp_socket) {
3312                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3313         }
3314 #ifdef INVARIANTS
3315         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3316             !TAILQ_EMPTY(&asoc->sent_queue) ||
3317             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3318                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3319         }
3320 #endif
3321         /* stop the timer */
3322         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_22);
3323         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3324         /* free the TCB */
3325         SCTPDBG(SCTP_DEBUG_INPUT2,
3326                 "sctp_handle_shutdown_complete: calls free-asoc\n");
3327 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3328         so = SCTP_INP_SO(stcb->sctp_ep);
3329         atomic_add_int(&stcb->asoc.refcnt, 1);
3330         SCTP_TCB_UNLOCK(stcb);
3331         SCTP_SOCKET_LOCK(so, 1);
3332         SCTP_TCB_LOCK(stcb);
3333         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3334 #endif
3335         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_23);
3336 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3337         SCTP_SOCKET_UNLOCK(so, 1);
3338 #endif
3339         return;
3340 }
3341
3342 static int
3343 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3344     struct sctp_nets *net, uint8_t flg)
3345 {
3346         switch (desc->chunk_type) {
3347         case SCTP_DATA:
3348                 /* find the tsn to resend (possibly */
3349         {
3350                 uint32_t tsn;
3351                 struct sctp_tmit_chunk *tp1;
3352
3353                 tsn = ntohl(desc->tsn_ifany);
3354                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3355                         if (tp1->rec.data.TSN_seq == tsn) {
3356                                 /* found it */
3357                                 break;
3358                         }
3359                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3360                                 /* not found */
3361                                 tp1 = NULL;
3362                                 break;
3363                         }
3364                 }
3365                 if (tp1 == NULL) {
3366                         /*
3367                          * Do it the other way , aka without paying
3368                          * attention to queue seq order.
3369                          */
3370                         SCTP_STAT_INCR(sctps_pdrpdnfnd);
3371                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3372                                 if (tp1->rec.data.TSN_seq == tsn) {
3373                                         /* found it */
3374                                         break;
3375                                 }
3376                         }
3377                 }
3378                 if (tp1 == NULL) {
3379                         SCTP_STAT_INCR(sctps_pdrptsnnf);
3380                 }
3381                 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3382                         uint8_t *ddp;
3383
3384                         if (((flg & SCTP_BADCRC) == 0) &&
3385                             ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3386                                 return (0);
3387                         }
3388                         if ((stcb->asoc.peers_rwnd == 0) &&
3389                             ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3390                                 SCTP_STAT_INCR(sctps_pdrpdiwnp);
3391                                 return (0);
3392                         }
3393                         if (stcb->asoc.peers_rwnd == 0 &&
3394                             (flg & SCTP_FROM_MIDDLE_BOX)) {
3395                                 SCTP_STAT_INCR(sctps_pdrpdizrw);
3396                                 return (0);
3397                         }
3398                         ddp = (uint8_t *) (mtod(tp1->data, caddr_t) +
3399                                            sizeof(struct sctp_data_chunk));
3400                         {
3401                                 unsigned int iii;
3402
3403                                 for (iii = 0; iii < sizeof(desc->data_bytes);
3404                                      iii++) {
3405                                         if (ddp[iii] != desc->data_bytes[iii]) {
3406                                                 SCTP_STAT_INCR(sctps_pdrpbadd);
3407                                                 return (-1);
3408                                         }
3409                                 }
3410                         }
3411
3412                         if (tp1->do_rtt) {
3413                                 /*
3414                                  * this guy had a RTO calculation
3415                                  * pending on it, cancel it
3416                                  */
3417                                 if (tp1->whoTo->rto_needed == 0) {
3418                                         tp1->whoTo->rto_needed = 1;
3419                                 }
3420                                 tp1->do_rtt = 0;
3421                         }
3422                         SCTP_STAT_INCR(sctps_pdrpmark);
3423                         if (tp1->sent != SCTP_DATAGRAM_RESEND)
3424                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3425                         /*
3426                          * mark it as if we were doing a FR, since
3427                          * we will be getting gap ack reports behind
3428                          * the info from the router.
3429                          */
3430                         tp1->rec.data.doing_fast_retransmit = 1;
3431                         /*
3432                          * mark the tsn with what sequences can
3433                          * cause a new FR.
3434                          */
3435                         if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3436                                 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3437                         } else {
3438                                 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3439                         }
3440
3441                         /* restart the timer */
3442                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3443                                         stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT+SCTP_LOC_24);
3444                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3445                                          stcb, tp1->whoTo);
3446
3447                         /* fix counts and things */
3448                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3449                                 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3450                                                tp1->whoTo->flight_size,
3451                                                tp1->book_size,
3452                                                (uintptr_t)stcb,
3453                                                tp1->rec.data.TSN_seq);
3454                         }
3455                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3456                                 sctp_flight_size_decrease(tp1);
3457                                 sctp_total_flight_decrease(stcb, tp1);
3458                         }
3459                         tp1->sent = SCTP_DATAGRAM_RESEND;
3460                 } {
3461                         /* audit code */
3462                         unsigned int audit;
3463
3464                         audit = 0;
3465                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3466                                 if (tp1->sent == SCTP_DATAGRAM_RESEND)
3467                                         audit++;
3468                         }
3469                         TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3470                                       sctp_next) {
3471                                 if (tp1->sent == SCTP_DATAGRAM_RESEND)
3472                                         audit++;
3473                         }
3474                         if (audit != stcb->asoc.sent_queue_retran_cnt) {
3475                                 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3476                                             audit, stcb->asoc.sent_queue_retran_cnt);
3477 #ifndef SCTP_AUDITING_ENABLED
3478                                 stcb->asoc.sent_queue_retran_cnt = audit;
3479 #endif
3480                         }
3481                 }
3482         }
3483         break;
3484         case SCTP_ASCONF:
3485         {
3486                 struct sctp_tmit_chunk *asconf;
3487
3488                 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3489                               sctp_next) {
3490                         if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3491                                 break;
3492                         }
3493                 }
3494                 if (asconf) {
3495                         if (asconf->sent != SCTP_DATAGRAM_RESEND)
3496                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3497                         asconf->sent = SCTP_DATAGRAM_RESEND;
3498                         asconf->snd_count--;
3499                 }
3500         }
3501         break;
3502         case SCTP_INITIATION:
3503                 /* resend the INIT */
3504                 stcb->asoc.dropped_special_cnt++;
3505                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3506                         /*
3507                          * If we can get it in, in a few attempts we do
3508                          * this, otherwise we let the timer fire.
3509                          */
3510                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3511                                         stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_25);
3512                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3513                 }
3514                 break;
3515         case SCTP_SELECTIVE_ACK:
3516         case SCTP_NR_SELECTIVE_ACK:
3517                 /* resend the sack */
3518                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3519                 break;
3520         case SCTP_HEARTBEAT_REQUEST:
3521                 /* resend a demand HB */
3522                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3523                         /* Only retransmit if we KNOW we wont destroy the tcb */
3524                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3525                 }
3526                 break;
3527         case SCTP_SHUTDOWN:
3528                 sctp_send_shutdown(stcb, net);
3529                 break;
3530         case SCTP_SHUTDOWN_ACK:
3531                 sctp_send_shutdown_ack(stcb, net);
3532                 break;
3533         case SCTP_COOKIE_ECHO:
3534         {
3535                 struct sctp_tmit_chunk *cookie;
3536
3537                 cookie = NULL;
3538                 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3539                               sctp_next) {
3540                         if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3541                                 break;
3542                         }
3543                 }
3544                 if (cookie) {
3545                         if (cookie->sent != SCTP_DATAGRAM_RESEND)
3546                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3547                         cookie->sent = SCTP_DATAGRAM_RESEND;
3548                         sctp_stop_all_cookie_timers(stcb);
3549                 }
3550         }
3551         break;
3552         case SCTP_COOKIE_ACK:
3553                 sctp_send_cookie_ack(stcb);
3554                 break;
3555         case SCTP_ASCONF_ACK:
3556                 /* resend last asconf ack */
3557                 sctp_send_asconf_ack(stcb);
3558                 break;
3559         case SCTP_FORWARD_CUM_TSN:
3560                 send_forward_tsn(stcb, &stcb->asoc);
3561                 break;
3562                 /* can't do anything with these */
3563         case SCTP_PACKET_DROPPED:
3564         case SCTP_INITIATION_ACK:       /* this should not happen */
3565         case SCTP_HEARTBEAT_ACK:
3566         case SCTP_ABORT_ASSOCIATION:
3567         case SCTP_OPERATION_ERROR:
3568         case SCTP_SHUTDOWN_COMPLETE:
3569         case SCTP_ECN_ECHO:
3570         case SCTP_ECN_CWR:
3571         default:
3572                 break;
3573         }
3574         return (0);
3575 }
3576
3577 void
3578 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3579 {
3580         uint32_t i;
3581         uint16_t temp;
3582
3583         /*
3584          * We set things to 0xffff since this is the last delivered sequence
3585          * and we will be sending in 0 after the reset.
3586          */
3587
3588         if (number_entries) {
3589                 for (i = 0; i < number_entries; i++) {
3590                         temp = ntohs(list[i]);
3591                         if (temp >= stcb->asoc.streamincnt) {
3592                                 continue;
3593                         }
3594                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff;
3595                 }
3596         } else {
3597                 list = NULL;
3598                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3599                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
3600                 }
3601         }
3602         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3603 }
3604
3605 static void
3606 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3607 {
3608         uint32_t i;
3609         uint16_t temp;
3610
3611         if (number_entries > 0) {
3612                 for (i = 0; i < number_entries; i++) {
3613                         temp = ntohs(list[i]);
3614                         if (temp >= stcb->asoc.streamoutcnt) {
3615                                 /* no such stream */
3616                                 continue;
3617                         }
3618                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3619                 }
3620         } else {
3621                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3622                         stcb->asoc.strmout[i].next_sequence_send = 0;
3623                 }
3624         }
3625         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3626 }
3627
3628
3629 struct sctp_stream_reset_out_request *
3630 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3631 {
3632         struct sctp_association *asoc;
3633         struct sctp_chunkhdr *ch;
3634         struct sctp_stream_reset_out_request *r;
3635         struct sctp_tmit_chunk *chk;
3636         int len, clen;
3637
3638         asoc = &stcb->asoc;
3639         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3640                 asoc->stream_reset_outstanding = 0;
3641                 return (NULL);
3642         }
3643         if (stcb->asoc.str_reset == NULL) {
3644                 asoc->stream_reset_outstanding = 0;
3645                 return (NULL);
3646         }
3647         chk = stcb->asoc.str_reset;
3648         if (chk->data == NULL) {
3649                 return (NULL);
3650         }
3651         if (bchk) {
3652                 /* he wants a copy of the chk pointer */
3653                 *bchk = chk;
3654         }
3655         clen = chk->send_size;
3656         ch = mtod(chk->data, struct sctp_chunkhdr *);
3657         r = (struct sctp_stream_reset_out_request *)(ch + 1);
3658         if (ntohl(r->request_seq) == seq) {
3659                 /* found it */
3660                 return (r);
3661         }
3662         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3663         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3664                 /* move to the next one, there can only be a max of two */
3665                 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len);
3666                 if (ntohl(r->request_seq) == seq) {
3667                         return (r);
3668                 }
3669         }
3670         /* that seq is not here */
3671         return (NULL);
3672 }
3673
3674 static void
3675 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3676 {
3677         struct sctp_association *asoc;
3678         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3679
3680         if (stcb->asoc.str_reset == NULL) {
3681                 return;
3682         }
3683         asoc = &stcb->asoc;
3684
3685         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT+SCTP_LOC_26);
3686         TAILQ_REMOVE(&asoc->control_send_queue,
3687             chk,
3688             sctp_next);
3689         if (chk->data) {
3690                 sctp_m_freem(chk->data);
3691                 chk->data = NULL;
3692         }
3693         asoc->ctrl_queue_cnt--;
3694         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3695         /*sa_ignore NO_NULL_CHK*/
3696         stcb->asoc.str_reset = NULL;
3697 }
3698
3699
3700 static int
3701 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3702                                   uint32_t seq, uint32_t action,
3703                                   struct sctp_stream_reset_response *respin)
3704 {
3705         uint16_t type;
3706         int lparm_len;
3707         struct sctp_association *asoc = &stcb->asoc;
3708         struct sctp_tmit_chunk *chk;
3709         struct sctp_stream_reset_out_request *srparam;
3710         uint32_t number_entries;
3711
3712         if (asoc->stream_reset_outstanding == 0) {
3713                 /* duplicate */
3714                 return (0);
3715         }
3716         if (seq == stcb->asoc.str_reset_seq_out) {
3717                 srparam = sctp_find_stream_reset(stcb, seq, &chk);
3718                 if (srparam) {
3719                         stcb->asoc.str_reset_seq_out++;
3720                         type = ntohs(srparam->ph.param_type);
3721                         lparm_len = ntohs(srparam->ph.param_length);
3722                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3723                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3724                                 asoc->stream_reset_out_is_outstanding = 0;
3725                                 if (asoc->stream_reset_outstanding)
3726                                         asoc->stream_reset_outstanding--;
3727                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3728                                         /* do it */
3729                                         sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams);
3730                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3731                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3732                                 } else {
3733                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3734                                 }
3735                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3736                                 /* Answered my request */
3737                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3738                                 if (asoc->stream_reset_outstanding)
3739                                         asoc->stream_reset_outstanding--;
3740                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3741                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3742                                                         number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3743                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3744                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3745                                                         number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED);
3746                                 }
3747                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3748                                 /* Ok we now may have more streams */
3749                                 int num_stream;
3750
3751                                 num_stream = stcb->asoc.strm_pending_add_size;
3752                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3753                                         /* TSNH */
3754                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3755                                 }
3756                                 stcb->asoc.strm_pending_add_size = 0;
3757                                 if (asoc->stream_reset_outstanding)
3758                                         asoc->stream_reset_outstanding--;
3759                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3760                                         /* Put the new streams into effect */
3761                                         stcb->asoc.streamoutcnt += num_stream;
3762                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3763                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3764                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3765                                                                      SCTP_STREAM_CHANGE_DENIED);
3766                                 } else {
3767                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3768                                                                      SCTP_STREAM_CHANGE_FAILED);
3769                                 }
3770                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3771                                 if (asoc->stream_reset_outstanding)
3772                                         asoc->stream_reset_outstanding--;
3773                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3774                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3775                                                                      SCTP_STREAM_CHANGE_DENIED);
3776                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3777                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3778                                                                      SCTP_STREAM_CHANGE_FAILED);
3779                                 }
3780                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3781                                 /**
3782                                  * a) Adopt the new in tsn.
3783                                  * b) reset the map
3784                                  * c) Adopt the new out-tsn
3785                                  */
3786                                 struct sctp_stream_reset_response_tsn *resp;
3787                                 struct sctp_forward_tsn_chunk fwdtsn;
3788                                 int abort_flag = 0;
3789                                 if (respin == NULL) {
3790                                         /* huh ? */
3791                                         return (0);
3792                                 }
3793                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3794                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3795                                         asoc->stream_reset_outstanding--;
3796                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3797                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3798                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3799                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3800                                         if (abort_flag) {
3801                                                 return (1);
3802                                         }
3803                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3804                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3805                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3806                                         }
3807
3808                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3809                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3810                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3811
3812                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3813                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3814
3815                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3816                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3817
3818                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3819                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3820                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3821                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3822                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3823                                                                      SCTP_ASSOC_RESET_DENIED);
3824                                 } else {
3825                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3826                                                                      SCTP_ASSOC_RESET_FAILED);
3827                                 }
3828                         }
3829                         /* get rid of the request and get the request flags */
3830                         if (asoc->stream_reset_outstanding == 0) {
3831                                 sctp_clean_up_stream_reset(stcb);
3832                         }
3833                 }
3834         }
3835         return (0);
3836 }
3837
3838 static void
3839 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3840     struct sctp_tmit_chunk *chk,
3841     struct sctp_stream_reset_in_request *req, int trunc)
3842 {
3843         uint32_t seq;
3844         int len, i;
3845         int number_entries;
3846         uint16_t temp;
3847
3848         /*
3849          * peer wants me to send a str-reset to him for my outgoing seq's if
3850          * seq_in is right.
3851          */
3852         struct sctp_association *asoc = &stcb->asoc;
3853
3854         seq = ntohl(req->request_seq);
3855         if (asoc->str_reset_seq_in == seq) {
3856                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3857                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3858                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3859                 } else if (trunc) {
3860                         /* Can't do it, since they exceeded our buffer size  */
3861                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3862                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3863                         len = ntohs(req->ph.param_length);
3864                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3865                         for (i = 0; i < number_entries; i++) {
3866                                 temp = ntohs(req->list_of_streams[i]);
3867                                 req->list_of_streams[i] = temp;
3868                         }
3869                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3870                         sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams,
3871                             asoc->str_reset_seq_out,
3872                             seq, (asoc->sending_seq - 1));
3873                         asoc->stream_reset_out_is_outstanding = 1;
3874                         asoc->str_reset = chk;
3875                         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
3876                         stcb->asoc.stream_reset_outstanding++;
3877                 } else {
3878                         /* Can't do it, since we have sent one out */
3879                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3880                 }
3881                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3882                 asoc->str_reset_seq_in++;
3883         } else if (asoc->str_reset_seq_in - 1 == seq) {
3884                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3885         } else if (asoc->str_reset_seq_in - 2 == seq) {
3886                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3887         } else {
3888                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3889         }
3890 }
3891
3892 static int
3893 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3894     struct sctp_tmit_chunk *chk,
3895     struct sctp_stream_reset_tsn_request *req)
3896 {
3897         /* reset all in and out and update the tsn */
3898         /*
3899          * A) reset my str-seq's on in and out. B) Select a receive next,
3900          * and set cum-ack to it. Also process this selected number as a
3901          * fwd-tsn as well. C) set in the response my next sending seq.
3902          */
3903         struct sctp_forward_tsn_chunk fwdtsn;
3904         struct sctp_association *asoc = &stcb->asoc;
3905         int abort_flag = 0;
3906         uint32_t seq;
3907
3908         seq = ntohl(req->request_seq);
3909         if (asoc->str_reset_seq_in == seq) {
3910                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3911                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3912                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3913                 } else {
3914                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3915                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3916                         fwdtsn.ch.chunk_flags = 0;
3917                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3918                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3919                         if (abort_flag) {
3920                                 return (1);
3921                         }
3922                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3923                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3924                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3925                         }
3926                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3927                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3928                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3929                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3930                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3931                         atomic_add_int(&asoc->sending_seq, 1);
3932                         /* save off historical data for retrans */
3933                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3934                         asoc->last_sending_seq[0] = asoc->sending_seq;
3935                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3936                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3937                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3938                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3939                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3940                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3941                 }
3942                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3943                                                  asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3944                 asoc->str_reset_seq_in++;
3945         } else if (asoc->str_reset_seq_in - 1 == seq) {
3946                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3947                                                  asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3948         } else if (asoc->str_reset_seq_in - 2 == seq) {
3949                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3950                                                  asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3951         } else {
3952                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3953         }
3954         return (0);
3955 }
3956
3957 static void
3958 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3959     struct sctp_tmit_chunk *chk,
3960     struct sctp_stream_reset_out_request *req, int trunc)
3961 {
3962         uint32_t seq, tsn;
3963         int number_entries, len;
3964         struct sctp_association *asoc = &stcb->asoc;
3965
3966         seq = ntohl(req->request_seq);
3967
3968         /* now if its not a duplicate we process it */
3969         if (asoc->str_reset_seq_in == seq) {
3970                 len = ntohs(req->ph.param_length);
3971                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3972                 /*
3973                  * the sender is resetting, handle the list issue.. we must
3974                  * a) verify if we can do the reset, if so no problem b) If
3975                  * we can't do the reset we must copy the request. c) queue
3976                  * it, and setup the data in processor to trigger it off
3977                  * when needed and dequeue all the queued data.
3978                  */
3979                 tsn = ntohl(req->send_reset_at_tsn);
3980
3981                 /* move the reset action back one */
3982                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3983                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3984                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3985                 } else if (trunc) {
3986                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3987                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3988                         /* we can do it now */
3989                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3990                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3991                 } else {
3992                         /*
3993                          * we must queue it up and thus wait for the TSN's
3994                          * to arrive that are at or before tsn
3995                          */
3996                         struct sctp_stream_reset_list *liste;
3997                         int siz;
3998
3999                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
4000                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
4001                                     siz, SCTP_M_STRESET);
4002                         if (liste == NULL) {
4003                                 /* gak out of memory */
4004                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4005                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4006                                 return;
4007                         }
4008                         liste->tsn = tsn;
4009                         liste->number_entries = number_entries;
4010                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
4011                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
4012                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4013                 }
4014                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4015                 asoc->str_reset_seq_in++;
4016         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4017                 /*
4018                  * one seq back, just echo back last action since my
4019                  * response was lost.
4020                  */
4021                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4022         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4023                 /*
4024                  * two seq back, just echo back last action since my
4025                  * response was lost.
4026                  */
4027                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4028         } else {
4029                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4030         }
4031 }
4032
4033 static void
4034 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4035                                struct sctp_stream_reset_add_strm  *str_add)
4036 {
4037         /*
4038          * Peer is requesting to add more streams.
4039          * If its within our max-streams we will
4040          * allow it.
4041          */
4042         uint32_t num_stream, i;
4043         uint32_t seq;
4044         struct sctp_association *asoc = &stcb->asoc;
4045         struct sctp_queued_to_read *ctl, *nctl;
4046
4047         /* Get the number. */
4048         seq = ntohl(str_add->request_seq);
4049         num_stream = ntohs(str_add->number_of_streams);
4050         /* Now what would be the new total? */
4051         if (asoc->str_reset_seq_in == seq) {
4052                 num_stream += stcb->asoc.streamincnt;
4053                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4054                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4055                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4056                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4057                            (num_stream > 0xffff)) {
4058                         /* We must reject it they ask for to many */
4059   denied:
4060                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4061                 } else {
4062                         /* Ok, we can do that :-) */
4063                         struct sctp_stream_in *oldstrm;
4064
4065                         /* save off the old */
4066                         oldstrm = stcb->asoc.strmin;
4067                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4068                                     (num_stream * sizeof(struct sctp_stream_in)),
4069                                     SCTP_M_STRMI);
4070                         if (stcb->asoc.strmin == NULL) {
4071                                 stcb->asoc.strmin = oldstrm;
4072                                 goto denied;
4073                         }
4074                         /* copy off the old data */
4075                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4076                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4077                                 stcb->asoc.strmin[i].stream_no = i;
4078                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
4079                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4080                                 /* now anything on those queues? */
4081                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) {
4082                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next);
4083                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next);
4084                                 }
4085                         }
4086                         /* Init the new streams */
4087                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4088                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4089                                 stcb->asoc.strmin[i].stream_no = i;
4090                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
4091                                 stcb->asoc.strmin[i].delivery_started = 0;
4092                         }
4093                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4094                         /* update the size */
4095                         stcb->asoc.streamincnt = num_stream;
4096                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4097                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4098                 }
4099                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4100                 asoc->str_reset_seq_in++;
4101         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4102                 /*
4103                  * one seq back, just echo back last action since my
4104                  * response was lost.
4105                  */
4106                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4107         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4108                 /*
4109                  * two seq back, just echo back last action since my
4110                  * response was lost.
4111                  */
4112                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4113         } else {
4114                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4115
4116         }
4117 }
4118
4119 static void
4120 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4121                                    struct sctp_stream_reset_add_strm  *str_add)
4122 {
4123         /*
4124          * Peer is requesting to add more streams.
4125          * If its within our max-streams we will
4126          * allow it.
4127          */
4128         uint16_t num_stream;
4129         uint32_t seq;
4130         struct sctp_association *asoc = &stcb->asoc;
4131
4132         /* Get the number. */
4133         seq = ntohl(str_add->request_seq);
4134         num_stream = ntohs(str_add->number_of_streams);
4135         /* Now what would be the new total? */
4136         if (asoc->str_reset_seq_in == seq) {
4137                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4138                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4139                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4140                 } else if (stcb->asoc.stream_reset_outstanding) {
4141                         /* We must reject it we have something pending */
4142                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4143                 } else {
4144                         /* Ok, we can do that :-) */
4145                         int mychk;
4146                         mychk = stcb->asoc.streamoutcnt;
4147                         mychk += num_stream;
4148                         if (mychk < 0x10000) {
4149                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4150                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) {
4151                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4152                                 }
4153                         } else {
4154                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4155                         }
4156                 }
4157                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4158                 asoc->str_reset_seq_in++;
4159         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4160                 /*
4161                  * one seq back, just echo back last action since my
4162                  * response was lost.
4163                  */
4164                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4165         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4166                 /*
4167                  * two seq back, just echo back last action since my
4168                  * response was lost.
4169                  */
4170                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4171         } else {
4172                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4173         }
4174 }
4175
4176 #if !defined(__Panda__)
4177 #ifdef __GNUC__
4178 __attribute__ ((noinline))
4179 #endif
4180 #endif
4181 static int
4182 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4183                          struct sctp_chunkhdr *ch_req)
4184 {
4185         int chk_length, param_len, ptype;
4186         struct sctp_paramhdr pstore;
4187         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4188         uint32_t seq = 0;
4189         int num_req = 0;
4190         int trunc = 0;
4191         struct sctp_tmit_chunk *chk;
4192         struct sctp_chunkhdr *ch;
4193         struct sctp_paramhdr *ph;
4194         int ret_code = 0;
4195         int num_param = 0;
4196
4197         /* now it may be a reset or a reset-response */
4198         chk_length = ntohs(ch_req->chunk_length);
4199
4200         /* setup for adding the response */
4201         sctp_alloc_a_chunk(stcb, chk);
4202         if (chk == NULL) {
4203                 return (ret_code);
4204         }
4205         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4206         chk->rec.chunk_id.can_take_data = 0;
4207         chk->asoc = &stcb->asoc;
4208         chk->no_fr_allowed = 0;
4209         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4210         chk->book_size_scale = 0;
4211         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4212         if (chk->data == NULL) {
4213         strres_nochunk:
4214                 if (chk->data) {
4215                         sctp_m_freem(chk->data);
4216                         chk->data = NULL;
4217                 }
4218                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4219                 return (ret_code);
4220         }
4221         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4222
4223         /* setup chunk parameters */
4224         chk->sent = SCTP_DATAGRAM_UNSENT;
4225         chk->snd_count = 0;
4226         chk->whoTo = NULL;
4227
4228         ch = mtod(chk->data, struct sctp_chunkhdr *);
4229         ch->chunk_type = SCTP_STREAM_RESET;
4230         ch->chunk_flags = 0;
4231         ch->chunk_length = htons(chk->send_size);
4232         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4233         offset += sizeof(struct sctp_chunkhdr);
4234         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) {
4235                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4236                 if (ph == NULL)
4237                         break;
4238                 param_len = ntohs(ph->param_length);
4239                 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) {
4240                         /* bad param */
4241                         break;
4242                 }
4243                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)),
4244                                                            (uint8_t *)&cstore);
4245                 ptype = ntohs(ph->param_type);
4246                 num_param++;
4247                 if (param_len > (int)sizeof(cstore)) {
4248                         trunc = 1;
4249                 } else {
4250                         trunc = 0;
4251                 }
4252                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4253                         /* hit the max of parameters already sorry.. */
4254                         break;
4255                 }
4256                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4257                         struct sctp_stream_reset_out_request *req_out;
4258                         req_out = (struct sctp_stream_reset_out_request *)ph;
4259                         num_req++;
4260                         if (stcb->asoc.stream_reset_outstanding) {
4261                                 seq = ntohl(req_out->response_seq);
4262                                 if (seq == stcb->asoc.str_reset_seq_out) {
4263                                         /* implicit ack */
4264                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4265                                 }
4266                         }
4267                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4268                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4269                         struct sctp_stream_reset_add_strm  *str_add;
4270                         str_add = (struct sctp_stream_reset_add_strm  *)ph;
4271                         num_req++;
4272                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4273                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4274                         struct sctp_stream_reset_add_strm  *str_add;
4275                         str_add = (struct sctp_stream_reset_add_strm  *)ph;
4276                         num_req++;
4277                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4278                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4279                         struct sctp_stream_reset_in_request *req_in;
4280                         num_req++;
4281                         req_in = (struct sctp_stream_reset_in_request *)ph;
4282                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4283                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4284                         struct sctp_stream_reset_tsn_request *req_tsn;
4285                         num_req++;
4286                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4287                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4288                                 ret_code = 1;
4289                                 goto strres_nochunk;
4290                         }
4291                         /* no more */
4292                         break;
4293                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4294                         struct sctp_stream_reset_response *resp;
4295                         uint32_t result;
4296                         resp = (struct sctp_stream_reset_response *)ph;
4297                         seq = ntohl(resp->response_seq);
4298                         result = ntohl(resp->result);
4299                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4300                                 ret_code = 1;
4301                                 goto strres_nochunk;
4302                         }
4303                 } else {
4304                         break;
4305                 }
4306                 offset += SCTP_SIZE32(param_len);
4307                 chk_length -= SCTP_SIZE32(param_len);
4308         }
4309         if (num_req == 0) {
4310                 /* we have no response free the stuff */
4311                 goto strres_nochunk;
4312         }
4313         /* ok we have a chunk to link in */
4314         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4315                           chk,
4316                           sctp_next);
4317         stcb->asoc.ctrl_queue_cnt++;
4318         return (ret_code);
4319 }
4320
4321 /*
4322  * Handle a router or endpoints report of a packet loss, there are two ways
4323  * to handle this, either we get the whole packet and must disect it
4324  * ourselves (possibly with truncation and or corruption) or it is a summary
4325  * from a middle box that did the disectting for us.
4326  */
4327 static void
4328 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4329     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4330 {
4331         uint32_t bottle_bw, on_queue;
4332         uint16_t trunc_len;
4333         unsigned int chlen;
4334         unsigned int at;
4335         struct sctp_chunk_desc desc;
4336         struct sctp_chunkhdr *ch;
4337
4338         chlen = ntohs(cp->ch.chunk_length);
4339         chlen -= sizeof(struct sctp_pktdrop_chunk);
4340         /* XXX possible chlen underflow */
4341         if (chlen == 0) {
4342                 ch = NULL;
4343                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4344                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4345         } else {
4346                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4347                 chlen -= sizeof(struct sctphdr);
4348                 /* XXX possible chlen underflow */
4349                 memset(&desc, 0, sizeof(desc));
4350         }
4351         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4352         if (trunc_len > limit) {
4353                 trunc_len = limit;
4354         }
4355
4356         /* now the chunks themselves */
4357         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4358                 desc.chunk_type = ch->chunk_type;
4359                 /* get amount we need to move */
4360                 at = ntohs(ch->chunk_length);
4361                 if (at < sizeof(struct sctp_chunkhdr)) {
4362                         /* corrupt chunk, maybe at the end? */
4363                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4364                         break;
4365                 }
4366                 if (trunc_len == 0) {
4367                         /* we are supposed to have all of it */
4368                         if (at > chlen) {
4369                                 /* corrupt skip it */
4370                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4371                                 break;
4372                         }
4373                 } else {
4374                         /* is there enough of it left ? */
4375                         if (desc.chunk_type == SCTP_DATA) {
4376                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4377                                     sizeof(desc.data_bytes))) {
4378                                         break;
4379                                 }
4380                         } else {
4381                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4382                                         break;
4383                                 }
4384                         }
4385                 }
4386                 if (desc.chunk_type == SCTP_DATA) {
4387                         /* can we get out the tsn? */
4388                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4389                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4390
4391                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4392                                 /* yep */
4393                                 struct sctp_data_chunk *dcp;
4394                                 uint8_t *ddp;
4395                                 unsigned int iii;
4396
4397                                 dcp = (struct sctp_data_chunk *)ch;
4398                                 ddp = (uint8_t *) (dcp + 1);
4399                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4400                                         desc.data_bytes[iii] = ddp[iii];
4401                                 }
4402                                 desc.tsn_ifany = dcp->dp.tsn;
4403                         } else {
4404                                 /* nope we are done. */
4405                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4406                                 break;
4407                         }
4408                 } else {
4409                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4410                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4411                 }
4412
4413                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4414                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4415                         break;
4416                 }
4417                 if (SCTP_SIZE32(at) > chlen) {
4418                         break;
4419                 }
4420                 chlen -= SCTP_SIZE32(at);
4421                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4422                         /* done, none left */
4423                         break;
4424                 }
4425                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4426         }
4427         /* Now update any rwnd --- possibly */
4428         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4429                 /* From a peer, we get a rwnd report */
4430                 uint32_t a_rwnd;
4431
4432                 SCTP_STAT_INCR(sctps_pdrpfehos);
4433
4434                 bottle_bw = ntohl(cp->bottle_bw);
4435                 on_queue = ntohl(cp->current_onq);
4436                 if (bottle_bw && on_queue) {
4437                         /* a rwnd report is in here */
4438                         if (bottle_bw > on_queue)
4439                                 a_rwnd = bottle_bw - on_queue;
4440                         else
4441                                 a_rwnd = 0;
4442
4443                         if (a_rwnd == 0)
4444                                 stcb->asoc.peers_rwnd = 0;
4445                         else {
4446                                 if (a_rwnd > stcb->asoc.total_flight) {
4447                                         stcb->asoc.peers_rwnd =
4448                                             a_rwnd - stcb->asoc.total_flight;
4449                                 } else {
4450                                         stcb->asoc.peers_rwnd = 0;
4451                                 }
4452                                 if (stcb->asoc.peers_rwnd <
4453                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4454                                         /* SWS sender side engages */
4455                                         stcb->asoc.peers_rwnd = 0;
4456                                 }
4457                         }
4458                 }
4459         } else {
4460                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4461         }
4462
4463         /* now middle boxes in sat networks get a cwnd bump */
4464         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4465             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4466             (stcb->asoc.sat_network)) {
4467                 /*
4468                  * This is debateable but for sat networks it makes sense
4469                  * Note if a T3 timer has went off, we will prohibit any
4470                  * changes to cwnd until we exit the t3 loss recovery.
4471                  */
4472                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4473                         net, cp, &bottle_bw, &on_queue);
4474         }
4475 }
4476
4477 /*
4478  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4479  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4480  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4481  * length of the complete packet outputs: - length: modified to remaining
4482  * length after control processing - netp: modified to new sctp_nets after
4483  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4484  * bad packet,...) otherwise return the tcb for this packet
4485  */
4486 #if !defined(__Panda__)
4487 #ifdef __GNUC__
4488 __attribute__ ((noinline))
4489 #endif
4490 #endif
4491 static struct sctp_tcb *
4492 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4493     struct sockaddr *src, struct sockaddr *dst,
4494     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4495     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4496 #if defined(__FreeBSD__)
4497     uint8_t use_mflowid, uint32_t mflowid,
4498 #endif
4499     uint32_t vrf_id, uint16_t port)
4500 {
4501         struct sctp_association *asoc;
4502         struct mbuf *op_err;
4503         char msg[SCTP_DIAG_INFO_LEN];
4504         uint32_t vtag_in;
4505         int num_chunks = 0;     /* number of control chunks processed */
4506         uint32_t chk_length;
4507         int ret;
4508         int abort_no_unlock = 0;
4509         int ecne_seen = 0;
4510         /*
4511          * How big should this be, and should it be alloc'd? Lets try the
4512          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4513          * until we get into jumbo grams and such..
4514          */
4515         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4516         struct sctp_tcb *locked_tcb = stcb;
4517         int got_auth = 0;
4518         uint32_t auth_offset = 0, auth_len = 0;
4519         int auth_skipped = 0;
4520         int asconf_cnt = 0;
4521 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4522         struct socket *so;
4523 #endif
4524
4525         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4526                 iphlen, *offset, length, (void *)stcb);
4527
4528         /* validate chunk header length... */
4529         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4530                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4531                         ntohs(ch->chunk_length));
4532                 if (locked_tcb) {
4533                         SCTP_TCB_UNLOCK(locked_tcb);
4534                 }
4535                 return (NULL);
4536         }
4537         /*
4538          * validate the verification tag
4539          */
4540         vtag_in = ntohl(sh->v_tag);
4541
4542         if (locked_tcb) {
4543                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4544         }
4545         if (ch->chunk_type == SCTP_INITIATION) {
4546                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4547                         ntohs(ch->chunk_length), vtag_in);
4548                 if (vtag_in != 0) {
4549                         /* protocol error- silently discard... */
4550                         SCTP_STAT_INCR(sctps_badvtag);
4551                         if (locked_tcb) {
4552                                 SCTP_TCB_UNLOCK(locked_tcb);
4553                         }
4554                         return (NULL);
4555                 }
4556         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4557                 /*
4558                  * If there is no stcb, skip the AUTH chunk and process
4559                  * later after a stcb is found (to validate the lookup was
4560                  * valid.
4561                  */
4562                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4563                     (stcb == NULL) &&
4564                     (inp->auth_supported == 1)) {
4565                         /* save this chunk for later processing */
4566                         auth_skipped = 1;
4567                         auth_offset = *offset;
4568                         auth_len = ntohs(ch->chunk_length);
4569
4570                         /* (temporarily) move past this chunk */
4571                         *offset += SCTP_SIZE32(auth_len);
4572                         if (*offset >= length) {
4573                                 /* no more data left in the mbuf chain */
4574                                 *offset = length;
4575                                 if (locked_tcb) {
4576                                         SCTP_TCB_UNLOCK(locked_tcb);
4577                                 }
4578                                 return (NULL);
4579                         }
4580                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4581                                                                    sizeof(struct sctp_chunkhdr), chunk_buf);
4582                 }
4583                 if (ch == NULL) {
4584                         /* Help */
4585                         *offset = length;
4586                         if (locked_tcb) {
4587                                 SCTP_TCB_UNLOCK(locked_tcb);
4588                         }
4589                         return (NULL);
4590                 }
4591                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4592                         goto process_control_chunks;
4593                 }
4594                 /*
4595                  * first check if it's an ASCONF with an unknown src addr we
4596                  * need to look inside to find the association
4597                  */
4598                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4599                         struct sctp_chunkhdr *asconf_ch = ch;
4600                         uint32_t asconf_offset = 0, asconf_len = 0;
4601
4602                         /* inp's refcount may be reduced */
4603                         SCTP_INP_INCR_REF(inp);
4604
4605                         asconf_offset = *offset;
4606                         do {
4607                                 asconf_len = ntohs(asconf_ch->chunk_length);
4608                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4609                                         break;
4610                                 stcb = sctp_findassociation_ep_asconf(m,
4611                                                                       *offset,
4612                                                                       dst,
4613                                                                       sh, &inp, netp, vrf_id);
4614                                 if (stcb != NULL)
4615                                         break;
4616                                 asconf_offset += SCTP_SIZE32(asconf_len);
4617                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4618                                                                                   sizeof(struct sctp_chunkhdr), chunk_buf);
4619                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4620                         if (stcb == NULL) {
4621                                 /*
4622                                  * reduce inp's refcount if not reduced in
4623                                  * sctp_findassociation_ep_asconf().
4624                                  */
4625                                 SCTP_INP_DECR_REF(inp);
4626                         } else {
4627                                 locked_tcb = stcb;
4628                         }
4629
4630                         /* now go back and verify any auth chunk to be sure */
4631                         if (auth_skipped && (stcb != NULL)) {
4632                                 struct sctp_auth_chunk *auth;
4633
4634                                 auth = (struct sctp_auth_chunk *)
4635                                         sctp_m_getptr(m, auth_offset,
4636                                                       auth_len, chunk_buf);
4637                                 got_auth = 1;
4638                                 auth_skipped = 0;
4639                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4640                                                                        auth_offset)) {
4641                                         /* auth HMAC failed so dump it */
4642                                         *offset = length;
4643                                         if (locked_tcb) {
4644                                                 SCTP_TCB_UNLOCK(locked_tcb);
4645                                         }
4646                                         return (NULL);
4647                                 } else {
4648                                         /* remaining chunks are HMAC checked */
4649                                         stcb->asoc.authenticated = 1;
4650                                 }
4651                         }
4652                 }
4653                 if (stcb == NULL) {
4654                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4655                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4656                                                      msg);
4657                         /* no association, so it's out of the blue... */
4658                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4659 #if defined(__FreeBSD__)
4660                                          use_mflowid, mflowid,
4661 #endif
4662                                          vrf_id, port);
4663                         *offset = length;
4664                         if (locked_tcb) {
4665                                 SCTP_TCB_UNLOCK(locked_tcb);
4666                         }
4667                         return (NULL);
4668                 }
4669                 asoc = &stcb->asoc;
4670                 /* ABORT and SHUTDOWN can use either v_tag... */
4671                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4672                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4673                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4674                         /* Take the T-bit always into account. */
4675                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4676                              (vtag_in == asoc->my_vtag)) ||
4677                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4678                              (vtag_in == asoc->peer_vtag))) {
4679                                 /* this is valid */
4680                         } else {
4681                                 /* drop this packet... */
4682                                 SCTP_STAT_INCR(sctps_badvtag);
4683                                 if (locked_tcb) {
4684                                         SCTP_TCB_UNLOCK(locked_tcb);
4685                                 }
4686                                 return (NULL);
4687                         }
4688                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4689                         if (vtag_in != asoc->my_vtag) {
4690                                 /*
4691                                  * this could be a stale SHUTDOWN-ACK or the
4692                                  * peer never got the SHUTDOWN-COMPLETE and
4693                                  * is still hung; we have started a new asoc
4694                                  * but it won't complete until the shutdown
4695                                  * is completed
4696                                  */
4697                                 if (locked_tcb) {
4698                                         SCTP_TCB_UNLOCK(locked_tcb);
4699                                 }
4700                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
4701                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4702                                                              msg);
4703                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4704                                                  sh, inp, op_err,
4705 #if defined(__FreeBSD__)
4706                                                  use_mflowid, mflowid,
4707 #endif
4708                                                  vrf_id, port);
4709                                 return (NULL);
4710                         }
4711                 } else {
4712                         /* for all other chunks, vtag must match */
4713                         if (vtag_in != asoc->my_vtag) {
4714                                 /* invalid vtag... */
4715                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4716                                         "invalid vtag: %xh, expect %xh\n",
4717                                         vtag_in, asoc->my_vtag);
4718                                 SCTP_STAT_INCR(sctps_badvtag);
4719                                 if (locked_tcb) {
4720                                         SCTP_TCB_UNLOCK(locked_tcb);
4721                                 }
4722                                 *offset = length;
4723                                 return (NULL);
4724                         }
4725                 }
4726         }                       /* end if !SCTP_COOKIE_ECHO */
4727         /*
4728          * process all control chunks...
4729          */
4730         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4731              (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4732              (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4733             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4734                 /* implied cookie-ack.. we must have lost the ack */
4735                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4736                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4737                                        stcb->asoc.overall_error_count,
4738                                        0,
4739                                        SCTP_FROM_SCTP_INPUT,
4740                                        __LINE__);
4741                 }
4742                 stcb->asoc.overall_error_count = 0;
4743                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4744                                        *netp);
4745         }
4746
4747  process_control_chunks:
4748         while (IS_SCTP_CONTROL(ch)) {
4749                 /* validate chunk length */
4750                 chk_length = ntohs(ch->chunk_length);
4751                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4752                         ch->chunk_type, chk_length);
4753                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4754                 if (chk_length < sizeof(*ch) ||
4755                     (*offset + (int)chk_length) > length) {
4756                         *offset = length;
4757                         if (locked_tcb) {
4758                                 SCTP_TCB_UNLOCK(locked_tcb);
4759                         }
4760                         return (NULL);
4761                 }
4762                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4763                 /*
4764                  * INIT-ACK only gets the init ack "header" portion only
4765                  * because we don't have to process the peer's COOKIE. All
4766                  * others get a complete chunk.
4767                  */
4768                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4769                     (ch->chunk_type == SCTP_INITIATION)) {
4770                         /* get an init-ack chunk */
4771                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4772                                                                    sizeof(struct sctp_init_ack_chunk), chunk_buf);
4773                         if (ch == NULL) {
4774                                 *offset = length;
4775                                 if (locked_tcb) {
4776                                         SCTP_TCB_UNLOCK(locked_tcb);
4777                                 }
4778                                 return (NULL);
4779                         }
4780                 } else {
4781                         /* For cookies and all other chunks. */
4782                         if (chk_length > sizeof(chunk_buf)) {
4783                                 /*
4784                                  * use just the size of the chunk buffer
4785                                  * so the front part of our chunks fit in
4786                                  * contiguous space up to the chunk buffer
4787                                  * size (508 bytes).
4788                                  * For chunks that need to get more than that
4789                                  * they must use the sctp_m_getptr() function
4790                                  * or other means (e.g. know how to parse mbuf
4791                                  * chains). Cookies do this already.
4792                                  */
4793                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4794                                                                            (sizeof(chunk_buf) - 4),
4795                                                                            chunk_buf);
4796                                 if (ch == NULL) {
4797                                         *offset = length;
4798                                         if (locked_tcb) {
4799                                                 SCTP_TCB_UNLOCK(locked_tcb);
4800                                         }
4801                                         return (NULL);
4802                                 }
4803                         } else {
4804                                 /* We can fit it all */
4805                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4806                                                                    chk_length, chunk_buf);
4807                                 if (ch == NULL) {
4808                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4809                                         *offset = length;
4810                                         if (locked_tcb) {
4811                                                 SCTP_TCB_UNLOCK(locked_tcb);
4812                                         }
4813                                         return (NULL);
4814                                 }
4815                         }
4816                 }
4817                 num_chunks++;
4818                 /* Save off the last place we got a control from */
4819                 if (stcb != NULL) {
4820                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4821                                 /*
4822                                  * allow last_control to be NULL if
4823                                  * ASCONF... ASCONF processing will find the
4824                                  * right net later
4825                                  */
4826                                 if ((netp != NULL) && (*netp != NULL))
4827                                         stcb->asoc.last_control_chunk_from = *netp;
4828                         }
4829                 }
4830 #ifdef SCTP_AUDITING_ENABLED
4831                 sctp_audit_log(0xB0, ch->chunk_type);
4832 #endif
4833
4834                 /* check to see if this chunk required auth, but isn't */
4835                 if ((stcb != NULL) &&
4836                     (stcb->asoc.auth_supported == 1) &&
4837                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4838                     !stcb->asoc.authenticated) {
4839                         /* "silently" ignore */
4840                         SCTP_STAT_INCR(sctps_recvauthmissing);
4841                         goto next_chunk;
4842                 }
4843                 switch (ch->chunk_type) {
4844                 case SCTP_INITIATION:
4845                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4846                         /* The INIT chunk must be the only chunk. */
4847                         if ((num_chunks > 1) ||
4848                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4849                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4850                                                              "INIT not the only chunk");
4851                                 sctp_abort_association(inp, stcb, m, iphlen,
4852                                                        src, dst, sh, op_err,
4853 #if defined(__FreeBSD__)
4854                                                        use_mflowid, mflowid,
4855 #endif
4856                                                        vrf_id, port);
4857                                 *offset = length;
4858                                 return (NULL);
4859                         }
4860                         /* Honor our resource limit. */
4861                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4862                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4863                                 sctp_abort_association(inp, stcb, m, iphlen,
4864                                                        src, dst, sh, op_err,
4865 #if defined(__FreeBSD__)
4866                                                        use_mflowid, mflowid,
4867 #endif
4868                                                        vrf_id, port);
4869                                 *offset = length;
4870                                 return (NULL);
4871                         }
4872                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4873                                          (struct sctp_init_chunk *)ch, inp,
4874                                          stcb, &abort_no_unlock,
4875 #if defined(__FreeBSD__)
4876                                          use_mflowid, mflowid,
4877 #endif
4878                                          vrf_id, port);
4879                         *offset = length;
4880                         if ((!abort_no_unlock) && (locked_tcb)) {
4881                                 SCTP_TCB_UNLOCK(locked_tcb);
4882                         }
4883                         return (NULL);
4884                         break;
4885                 case SCTP_PAD_CHUNK:
4886                         break;
4887                 case SCTP_INITIATION_ACK:
4888                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4889                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4890                                 /* We are not interested anymore */
4891                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4892                                         ;
4893                                 } else {
4894                                         if (locked_tcb != stcb) {
4895                                                 /* Very unlikely */
4896                                                 SCTP_TCB_UNLOCK(locked_tcb);
4897                                         }
4898                                         *offset = length;
4899                                         if (stcb) {
4900 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4901                                                 so = SCTP_INP_SO(inp);
4902                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4903                                                 SCTP_TCB_UNLOCK(stcb);
4904                                                 SCTP_SOCKET_LOCK(so, 1);
4905                                                 SCTP_TCB_LOCK(stcb);
4906                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4907 #endif
4908                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_27);
4909 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4910                                                 SCTP_SOCKET_UNLOCK(so, 1);
4911 #endif
4912                                         }
4913                                         return (NULL);
4914                                 }
4915                         }
4916                         /* The INIT-ACK chunk must be the only chunk. */
4917                         if ((num_chunks > 1) ||
4918                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4919                                 *offset = length;
4920                                 if (locked_tcb) {
4921                                         SCTP_TCB_UNLOCK(locked_tcb);
4922                                 }
4923                                 return (NULL);
4924                         }
4925                         if ((netp) && (*netp)) {
4926                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4927                                                            src, dst, sh,
4928                                                            (struct sctp_init_ack_chunk *)ch,
4929                                                            stcb, *netp,
4930                                                            &abort_no_unlock,
4931 #if defined(__FreeBSD__)
4932                                                            use_mflowid, mflowid,
4933 #endif
4934                                                            vrf_id);
4935                         } else {
4936                                 ret = -1;
4937                         }
4938                         *offset = length;
4939                         if (abort_no_unlock) {
4940                                 return (NULL);
4941                         }
4942                         /*
4943                          * Special case, I must call the output routine to
4944                          * get the cookie echoed
4945                          */
4946                         if ((stcb != NULL) && (ret == 0)) {
4947                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4948                         }
4949                         if (locked_tcb) {
4950                                 SCTP_TCB_UNLOCK(locked_tcb);
4951                         }
4952                         return (NULL);
4953                         break;
4954                 case SCTP_SELECTIVE_ACK:
4955                         {
4956                                 struct sctp_sack_chunk *sack;
4957                                 int abort_now = 0;
4958                                 uint32_t a_rwnd, cum_ack;
4959                                 uint16_t num_seg, num_dup;
4960                                 uint8_t flags;
4961                                 int offset_seg, offset_dup;
4962
4963                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4964                                 SCTP_STAT_INCR(sctps_recvsacks);
4965                                 if (stcb == NULL) {
4966                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4967                                         break;
4968                                 }
4969                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4970                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4971                                         break;
4972                                 }
4973                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4974                                         /*-
4975                                          * If we have sent a shutdown-ack, we will pay no
4976                                          * attention to a sack sent in to us since
4977                                          * we don't care anymore.
4978                                          */
4979                                         break;
4980                                 }
4981                                 sack = (struct sctp_sack_chunk *)ch;
4982                                 flags = ch->chunk_flags;
4983                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4984                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4985                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4986                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4987                                 if (sizeof(struct sctp_sack_chunk) +
4988                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4989                                     num_dup * sizeof(uint32_t) != chk_length) {
4990                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4991                                         break;
4992                                 }
4993                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4994                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4995                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4996                                         cum_ack, num_seg, a_rwnd);
4997                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4998                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4999                                     (num_seg == 0) &&
5000                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5001                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5002                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5003                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
5004                                         ) {
5005                                         /* We have a SIMPLE sack having no prior segments and
5006                                          * data on sent queue to be acked.. Use the faster
5007                                          * path sack processing. We also allow window update
5008                                          * sacks with no missing segments to go this way too.
5009                                          */
5010                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
5011                                 } else {
5012                                         if (netp && *netp)
5013                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5014                                                                  num_seg, 0, num_dup, &abort_now, flags,
5015                                                                  cum_ack, a_rwnd, ecne_seen);
5016                                 }
5017                                 if (abort_now) {
5018                                         /* ABORT signal from sack processing */
5019                                         *offset = length;
5020                                         return (NULL);
5021                                 }
5022                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5023                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5024                                     (stcb->asoc.stream_queue_cnt == 0)) {
5025                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb,  0, NULL, SCTP_SO_NOT_LOCKED);
5026                                 }
5027                         }
5028                         break;
5029                 /* EY - nr_sack:  If the received chunk is an nr_sack chunk */
5030                 case SCTP_NR_SELECTIVE_ACK:
5031                         {
5032                                 struct sctp_nr_sack_chunk *nr_sack;
5033                                 int abort_now = 0;
5034                                 uint32_t a_rwnd, cum_ack;
5035                                 uint16_t num_seg, num_nr_seg, num_dup;
5036                                 uint8_t flags;
5037                                 int offset_seg, offset_dup;
5038
5039                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
5040                                 SCTP_STAT_INCR(sctps_recvsacks);
5041                                 if (stcb == NULL) {
5042                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
5043                                         break;
5044                                 }
5045                                 if (stcb->asoc.nrsack_supported == 0) {
5046                                         goto unknown_chunk;
5047                                 }
5048                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5049                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
5050                                         break;
5051                                 }
5052                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5053                                         /*-
5054                                          * If we have sent a shutdown-ack, we will pay no
5055                                          * attention to a sack sent in to us since
5056                                          * we don't care anymore.
5057                                          */
5058                                         break;
5059                                 }
5060                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5061                                 flags = ch->chunk_flags;
5062                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5063                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5064                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5065                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5066                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
5067                                 if (sizeof(struct sctp_nr_sack_chunk) +
5068                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5069                                     num_dup * sizeof(uint32_t) != chk_length) {
5070                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5071                                         break;
5072                                 }
5073                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5074                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5075                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5076                                         cum_ack, num_seg, a_rwnd);
5077                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5078                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5079                                     (num_seg == 0) && (num_nr_seg == 0) &&
5080                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5081                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5082                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5083                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5084                                         /*
5085                                          * We have a SIMPLE sack having no
5086                                          * prior segments and data on sent
5087                                          * queue to be acked. Use the
5088                                          * faster path sack processing. We
5089                                          * also allow window update sacks
5090                                          * with no missing segments to go
5091                                          * this way too.
5092                                          */
5093                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5094                                                                  &abort_now, ecne_seen);
5095                                 } else {
5096                                         if (netp && *netp)
5097                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5098                                                                  num_seg, num_nr_seg, num_dup, &abort_now, flags,
5099                                                                  cum_ack, a_rwnd, ecne_seen);
5100                                 }
5101                                 if (abort_now) {
5102                                         /* ABORT signal from sack processing */
5103                                         *offset = length;
5104                                         return (NULL);
5105                                 }
5106                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5107                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5108                                     (stcb->asoc.stream_queue_cnt == 0)) {
5109                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb,  0, NULL, SCTP_SO_NOT_LOCKED);
5110                                 }
5111                         }
5112                         break;
5113
5114                 case SCTP_HEARTBEAT_REQUEST:
5115                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5116                         if ((stcb) && netp && *netp) {
5117                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5118                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5119                                                         chk_length, *netp);
5120
5121                                 /* He's alive so give him credit */
5122                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5123                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5124                                                        stcb->asoc.overall_error_count,
5125                                                        0,
5126                                                        SCTP_FROM_SCTP_INPUT,
5127                                                        __LINE__);
5128                                 }
5129                                 stcb->asoc.overall_error_count = 0;
5130                         }
5131                         break;
5132                 case SCTP_HEARTBEAT_ACK:
5133                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5134                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5135                                 /* Its not ours */
5136                                 *offset = length;
5137                                 if (locked_tcb) {
5138                                         SCTP_TCB_UNLOCK(locked_tcb);
5139                                 }
5140                                 return (NULL);
5141                         }
5142                         /* He's alive so give him credit */
5143                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5144                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5145                                                stcb->asoc.overall_error_count,
5146                                                0,
5147                                                SCTP_FROM_SCTP_INPUT,
5148                                                __LINE__);
5149                         }
5150                         stcb->asoc.overall_error_count = 0;
5151                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5152                         if (netp && *netp)
5153                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5154                                                           stcb, *netp);
5155                         break;
5156                 case SCTP_ABORT_ASSOCIATION:
5157                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5158                                 (void *)stcb);
5159                         if ((stcb) && netp && *netp)
5160                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5161                                                   stcb, *netp);
5162                         *offset = length;
5163                         return (NULL);
5164                         break;
5165                 case SCTP_SHUTDOWN:
5166                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5167                                 (void *)stcb);
5168                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5169                                 *offset = length;
5170                                 if (locked_tcb) {
5171                                         SCTP_TCB_UNLOCK(locked_tcb);
5172                                 }
5173                                 return (NULL);
5174                         }
5175                         if (netp && *netp) {
5176                                 int abort_flag = 0;
5177
5178                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5179                                                      stcb, *netp, &abort_flag);
5180                                 if (abort_flag) {
5181                                         *offset = length;
5182                                         return (NULL);
5183                                 }
5184                         }
5185                         break;
5186                 case SCTP_SHUTDOWN_ACK:
5187                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5188                         if ((stcb) && (netp) && (*netp))
5189                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5190                         *offset = length;
5191                         return (NULL);
5192                         break;
5193
5194                 case SCTP_OPERATION_ERROR:
5195                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5196                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5197                                 *offset = length;
5198                                 return (NULL);
5199                         }
5200                         break;
5201                 case SCTP_COOKIE_ECHO:
5202                         SCTPDBG(SCTP_DEBUG_INPUT3,
5203                                 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5204                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5205                                 ;
5206                         } else {
5207                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5208                                         /* We are not interested anymore */
5209                                 abend:
5210                                         if (stcb) {
5211                                                 SCTP_TCB_UNLOCK(stcb);
5212                                         }
5213                                         *offset = length;
5214                                         return (NULL);
5215                                 }
5216                         }
5217                         /*
5218                          * First are we accepting? We do this again here
5219                          * since it is possible that a previous endpoint WAS
5220                          * listening responded to a INIT-ACK and then
5221                          * closed. We opened and bound.. and are now no
5222                          * longer listening.
5223                          */
5224
5225                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5226                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5227                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5228                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5229                                         sctp_abort_association(inp, stcb, m, iphlen,
5230                                                                src, dst, sh, op_err,
5231 #if defined(__FreeBSD__)
5232                                                                use_mflowid, mflowid,
5233 #endif
5234                                                                vrf_id, port);
5235                                 }
5236                                 *offset = length;
5237                                 return (NULL);
5238                         } else {
5239                                 struct mbuf *ret_buf;
5240                                 struct sctp_inpcb *linp;
5241                                 if (stcb) {
5242                                         linp = NULL;
5243                                 } else {
5244                                         linp = inp;
5245                                 }
5246
5247                                 if (linp) {
5248                                         SCTP_ASOC_CREATE_LOCK(linp);
5249                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5250                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5251                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5252                                                 goto abend;
5253                                         }
5254                                 }
5255
5256                                 if (netp) {
5257                                         ret_buf =
5258                                                 sctp_handle_cookie_echo(m, iphlen,
5259                                                                         *offset,
5260                                                                         src, dst,
5261                                                                         sh,
5262                                                                         (struct sctp_cookie_echo_chunk *)ch,
5263                                                                         &inp, &stcb, netp,
5264                                                                         auth_skipped,
5265                                                                         auth_offset,
5266                                                                         auth_len,
5267                                                                         &locked_tcb,
5268 #if defined(__FreeBSD__)
5269                                                                         use_mflowid,
5270                                                                         mflowid,
5271 #endif
5272                                                                         vrf_id,
5273                                                                         port);
5274                                 } else {
5275                                         ret_buf = NULL;
5276                                 }
5277                                 if (linp) {
5278                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5279                                 }
5280                                 if (ret_buf == NULL) {
5281                                         if (locked_tcb) {
5282                                                 SCTP_TCB_UNLOCK(locked_tcb);
5283                                         }
5284                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5285                                                 "GAK, null buffer\n");
5286                                         *offset = length;
5287                                         return (NULL);
5288                                 }
5289                                 /* if AUTH skipped, see if it verified... */
5290                                 if (auth_skipped) {
5291                                         got_auth = 1;
5292                                         auth_skipped = 0;
5293                                 }
5294                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5295                                         /*
5296                                          * Restart the timer if we have
5297                                          * pending data
5298                                          */
5299                                         struct sctp_tmit_chunk *chk;
5300
5301                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5302                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5303                                 }
5304                         }
5305                         break;
5306                 case SCTP_COOKIE_ACK:
5307                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5308                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5309                                 if (locked_tcb) {
5310                                         SCTP_TCB_UNLOCK(locked_tcb);
5311                                 }
5312                                 return (NULL);
5313                         }
5314                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5315                                 /* We are not interested anymore */
5316                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5317                                         ;
5318                                 } else if (stcb) {
5319 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5320                                         so = SCTP_INP_SO(inp);
5321                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5322                                         SCTP_TCB_UNLOCK(stcb);
5323                                         SCTP_SOCKET_LOCK(so, 1);
5324                                         SCTP_TCB_LOCK(stcb);
5325                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5326 #endif
5327                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_27);
5328 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5329                                         SCTP_SOCKET_UNLOCK(so, 1);
5330 #endif
5331                                         *offset = length;
5332                                         return (NULL);
5333                                 }
5334                         }
5335                         /* He's alive so give him credit */
5336                         if ((stcb) && netp && *netp) {
5337                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5338                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5339                                                        stcb->asoc.overall_error_count,
5340                                                        0,
5341                                                        SCTP_FROM_SCTP_INPUT,
5342                                                        __LINE__);
5343                                 }
5344                                 stcb->asoc.overall_error_count = 0;
5345                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch,stcb, *netp);
5346                         }
5347                         break;
5348                 case SCTP_ECN_ECHO:
5349                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5350                         /* He's alive so give him credit */
5351                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5352                                 /* Its not ours */
5353                                 if (locked_tcb) {
5354                                         SCTP_TCB_UNLOCK(locked_tcb);
5355                                 }
5356                                 *offset = length;
5357                                 return (NULL);
5358                         }
5359                         if (stcb) {
5360                                 if (stcb->asoc.ecn_supported == 0) {
5361                                         goto unknown_chunk;
5362                                 }
5363                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5364                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5365                                                        stcb->asoc.overall_error_count,
5366                                                        0,
5367                                                        SCTP_FROM_SCTP_INPUT,
5368                                                        __LINE__);
5369                                 }
5370                                 stcb->asoc.overall_error_count = 0;
5371                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5372                                                      stcb);
5373                                 ecne_seen = 1;
5374                         }
5375                         break;
5376                 case SCTP_ECN_CWR:
5377                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5378                         /* He's alive so give him credit */
5379                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5380                                 /* Its not ours */
5381                                 if (locked_tcb) {
5382                                         SCTP_TCB_UNLOCK(locked_tcb);
5383                                 }
5384                                 *offset = length;
5385                                 return (NULL);
5386                         }
5387                         if (stcb) {
5388                                 if (stcb->asoc.ecn_supported == 0) {
5389                                         goto unknown_chunk;
5390                                 }
5391                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5392                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5393                                                        stcb->asoc.overall_error_count,
5394                                                        0,
5395                                                        SCTP_FROM_SCTP_INPUT,
5396                                                        __LINE__);
5397                                 }
5398                                 stcb->asoc.overall_error_count = 0;
5399                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5400                         }
5401                         break;
5402                 case SCTP_SHUTDOWN_COMPLETE:
5403                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5404                         /* must be first and only chunk */
5405                         if ((num_chunks > 1) ||
5406                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5407                                 *offset = length;
5408                                 if (locked_tcb) {
5409                                         SCTP_TCB_UNLOCK(locked_tcb);
5410                                 }
5411                                 return (NULL);
5412                         }
5413                         if ((stcb) && netp && *netp) {
5414                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5415                                                               stcb, *netp);
5416                         }
5417                         *offset = length;
5418                         return (NULL);
5419                         break;
5420                 case SCTP_ASCONF:
5421                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5422                         /* He's alive so give him credit */
5423                         if (stcb) {
5424                                 if (stcb->asoc.asconf_supported == 0) {
5425                                         goto unknown_chunk;
5426                                 }
5427                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5428                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5429                                                        stcb->asoc.overall_error_count,
5430                                                        0,
5431                                                        SCTP_FROM_SCTP_INPUT,
5432                                                        __LINE__);
5433                                 }
5434                                 stcb->asoc.overall_error_count = 0;
5435                                 sctp_handle_asconf(m, *offset, src,
5436                                                    (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5437                                 asconf_cnt++;
5438                         }
5439                         break;
5440                 case SCTP_ASCONF_ACK:
5441                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5442                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5443                                 /* Its not ours */
5444                                 if (locked_tcb) {
5445                                         SCTP_TCB_UNLOCK(locked_tcb);
5446                                 }
5447                                 *offset = length;
5448                                 return (NULL);
5449                         }
5450                         if ((stcb) && netp && *netp) {
5451                                 if (stcb->asoc.asconf_supported == 0) {
5452                                         goto unknown_chunk;
5453                                 }
5454                                 /* He's alive so give him credit */
5455                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5456                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5457                                                        stcb->asoc.overall_error_count,
5458                                                        0,
5459                                                        SCTP_FROM_SCTP_INPUT,
5460                                                        __LINE__);
5461                                 }
5462                                 stcb->asoc.overall_error_count = 0;
5463                                 sctp_handle_asconf_ack(m, *offset,
5464                                                        (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5465                                 if (abort_no_unlock)
5466                                         return (NULL);
5467                         }
5468                         break;
5469                 case SCTP_FORWARD_CUM_TSN:
5470                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5471                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5472                                 /* Its not ours */
5473                                 if (locked_tcb) {
5474                                         SCTP_TCB_UNLOCK(locked_tcb);
5475                                 }
5476                                 *offset = length;
5477                                 return (NULL);
5478                         }
5479
5480                         /* He's alive so give him credit */
5481                         if (stcb) {
5482                                 int abort_flag = 0;
5483
5484                                 if (stcb->asoc.prsctp_supported == 0) {
5485                                         goto unknown_chunk;
5486                                 }
5487                                 stcb->asoc.overall_error_count = 0;
5488                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5489                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5490                                                        stcb->asoc.overall_error_count,
5491                                                        0,
5492                                                        SCTP_FROM_SCTP_INPUT,
5493                                                        __LINE__);
5494                                 }
5495                                 *fwd_tsn_seen = 1;
5496                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5497                                         /* We are not interested anymore */
5498 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5499                                         so = SCTP_INP_SO(inp);
5500                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5501                                         SCTP_TCB_UNLOCK(stcb);
5502                                         SCTP_SOCKET_LOCK(so, 1);
5503                                         SCTP_TCB_LOCK(stcb);
5504                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5505 #endif
5506                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_29);
5507 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5508                                         SCTP_SOCKET_UNLOCK(so, 1);
5509 #endif
5510                                         *offset = length;
5511                                         return (NULL);
5512                                 }
5513                                 sctp_handle_forward_tsn(stcb,
5514                                                         (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5515                                 if (abort_flag) {
5516                                         *offset = length;
5517                                         return (NULL);
5518                                 } else {
5519                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5520                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5521                                                                stcb->asoc.overall_error_count,
5522                                                                0,
5523                                                                SCTP_FROM_SCTP_INPUT,
5524                                                                __LINE__);
5525                                         }
5526                                         stcb->asoc.overall_error_count = 0;
5527                                 }
5528
5529                         }
5530                         break;
5531                 case SCTP_STREAM_RESET:
5532                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5533                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5534                                 /* Its not ours */
5535                                 if (locked_tcb) {
5536                                         SCTP_TCB_UNLOCK(locked_tcb);
5537                                 }
5538                                 *offset = length;
5539                                 return (NULL);
5540                         }
5541                         if (stcb->asoc.reconfig_supported == 0) {
5542                                 goto unknown_chunk;
5543                         }
5544                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5545                                 /* stop processing */
5546                                 *offset = length;
5547                                 return (NULL);
5548                         }
5549                         break;
5550                 case SCTP_PACKET_DROPPED:
5551                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5552                         /* re-get it all please */
5553                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5554                                 /* Its not ours */
5555                                 if (locked_tcb) {
5556                                         SCTP_TCB_UNLOCK(locked_tcb);
5557                                 }
5558                                 *offset = length;
5559                                 return (NULL);
5560                         }
5561
5562
5563                         if (ch && (stcb) && netp && (*netp)) {
5564                                 if (stcb->asoc.pktdrop_supported == 0) {
5565                                         goto unknown_chunk;
5566                                 }
5567                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5568                                                            stcb, *netp,
5569                                                            min(chk_length, (sizeof(chunk_buf) - 4)));
5570
5571                         }
5572
5573                         break;
5574                 case SCTP_AUTHENTICATION:
5575                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5576                         if (stcb == NULL) {
5577                                 /* save the first AUTH for later processing */
5578                                 if (auth_skipped == 0) {
5579                                         auth_offset = *offset;
5580                                         auth_len = chk_length;
5581                                         auth_skipped = 1;
5582                                 }
5583                                 /* skip this chunk (temporarily) */
5584                                 goto next_chunk;
5585                         }
5586                         if (stcb->asoc.auth_supported == 0) {
5587                                 goto unknown_chunk;
5588                         }
5589                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5590                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5591                                            SCTP_AUTH_DIGEST_LEN_MAX))) {
5592                                 /* Its not ours */
5593                                 if (locked_tcb) {
5594                                         SCTP_TCB_UNLOCK(locked_tcb);
5595                                 }
5596                                 *offset = length;
5597                                 return (NULL);
5598                         }
5599                         if (got_auth == 1) {
5600                                 /* skip this chunk... it's already auth'd */
5601                                 goto next_chunk;
5602                         }
5603                         got_auth = 1;
5604                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5605                                                              m, *offset)) {
5606                                 /* auth HMAC failed so dump the packet */
5607                                 *offset = length;
5608                                 return (stcb);
5609                         } else {
5610                                 /* remaining chunks are HMAC checked */
5611                                 stcb->asoc.authenticated = 1;
5612                         }
5613                         break;
5614
5615                 default:
5616                 unknown_chunk:
5617                         /* it's an unknown chunk! */
5618                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5619                                 struct mbuf *mm;
5620                                 struct sctp_paramhdr *phd;
5621
5622                                 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
5623                                                            0, M_NOWAIT, 1, MT_DATA);
5624                                 if (mm) {
5625                                         phd = mtod(mm, struct sctp_paramhdr *);
5626                                         /*
5627                                          * We cheat and use param type since
5628                                          * we did not bother to define a
5629                                          * error cause struct. They are the
5630                                          * same basic format with different
5631                                          * names.
5632                                          */
5633                                         phd->param_type =  htons(SCTP_CAUSE_UNRECOG_CHUNK);
5634                                         phd->param_length = htons(chk_length + sizeof(*phd));
5635                                         SCTP_BUF_LEN(mm) = sizeof(*phd);
5636                                         SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT);
5637                                         if (SCTP_BUF_NEXT(mm)) {
5638                                                 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL) == NULL) {
5639                                                         sctp_m_freem(mm);
5640                                                 } else {
5641 #ifdef SCTP_MBUF_LOGGING
5642                                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5643                                                                 struct mbuf *mat;
5644
5645                                                                 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) {
5646                                                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
5647                                                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
5648                                                                         }
5649                                                                 }
5650                                                         }
5651 #endif
5652                                                         sctp_queue_op_err(stcb, mm);
5653                                                 }
5654                                         } else {
5655                                                 sctp_m_freem(mm);
5656                                         }
5657                                 }
5658                         }
5659                         if ((ch->chunk_type & 0x80) == 0) {
5660                                 /* discard this packet */
5661                                 *offset = length;
5662                                 return (stcb);
5663                         }       /* else skip this bad chunk and continue... */
5664                         break;
5665                 }               /* switch (ch->chunk_type) */
5666
5667
5668         next_chunk:
5669                 /* get the next chunk */
5670                 *offset += SCTP_SIZE32(chk_length);
5671                 if (*offset >= length) {
5672                         /* no more data left in the mbuf chain */
5673                         break;
5674                 }
5675                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5676                                                            sizeof(struct sctp_chunkhdr), chunk_buf);
5677                 if (ch == NULL) {
5678                         if (locked_tcb) {
5679                                 SCTP_TCB_UNLOCK(locked_tcb);
5680                         }
5681                         *offset = length;
5682                         return (NULL);
5683                 }
5684         }                       /* while */
5685
5686         if (asconf_cnt > 0 && stcb != NULL) {
5687                 sctp_send_asconf_ack(stcb);
5688         }
5689         return (stcb);
5690 }
5691
5692
5693 #ifdef INVARIANTS
5694 #ifdef __GNUC__
5695 __attribute__((noinline))
5696 #endif
5697 void
5698 sctp_validate_no_locks(struct sctp_inpcb *inp)
5699 {
5700 #ifndef __APPLE__
5701         struct sctp_tcb *lstcb;
5702
5703         LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) {
5704                 if (mtx_owned(&lstcb->tcb_mtx)) {
5705                         panic("Own lock on stcb at return from input");
5706                 }
5707         }
5708         if (mtx_owned(&inp->inp_create_mtx)) {
5709                 panic("Own create lock on inp");
5710         }
5711         if (mtx_owned(&inp->inp_mtx)) {
5712                 panic("Own inp lock on inp");
5713         }
5714 #endif
5715 }
5716 #endif
5717
5718 /*
5719  * common input chunk processing (v4 and v6)
5720  */
5721 void
5722 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5723                              struct sockaddr *src, struct sockaddr *dst,
5724                              struct sctphdr *sh, struct sctp_chunkhdr *ch,
5725 #if !defined(SCTP_WITH_NO_CSUM)
5726                              uint8_t compute_crc,
5727 #endif
5728                              uint8_t ecn_bits,
5729 #if defined(__FreeBSD__)
5730                              uint8_t use_mflowid, uint32_t mflowid,
5731 #endif
5732                              uint32_t vrf_id, uint16_t port)
5733 {
5734         uint32_t high_tsn;
5735         int fwd_tsn_seen = 0, data_processed = 0;
5736         struct mbuf *m = *mm, *op_err;
5737         char msg[SCTP_DIAG_INFO_LEN];
5738         int un_sent;
5739         int cnt_ctrl_ready = 0;
5740         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5741         struct sctp_tcb *stcb = NULL;
5742         struct sctp_nets *net = NULL;
5743
5744         SCTP_STAT_INCR(sctps_recvdatagrams);
5745 #ifdef SCTP_AUDITING_ENABLED
5746         sctp_audit_log(0xE0, 1);
5747         sctp_auditing(0, inp, stcb, net);
5748 #endif
5749 #if !defined(SCTP_WITH_NO_CSUM)
5750         if (compute_crc != 0) {
5751                 uint32_t check, calc_check;
5752
5753                 check = sh->checksum;
5754                 sh->checksum = 0;
5755                 calc_check = sctp_calculate_cksum(m, iphlen);
5756                 sh->checksum = check;
5757                 if (calc_check != check) {
5758                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5759                                 calc_check, check, (void *)m, length, iphlen);
5760                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5761                                                          sh, ch, &inp, &net, vrf_id);
5762 #if defined(INET) || defined(INET6)
5763                         if ((net != NULL) && (port != 0)) {
5764                                 if (net->port == 0) {
5765                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5766                                 }
5767                                 net->port = port;
5768                         }
5769 #endif
5770 #if defined(__FreeBSD__)
5771                         if ((net != NULL) && (use_mflowid != 0)) {
5772                                 net->flowid = mflowid;
5773 #ifdef INVARIANTS
5774                                 net->flowidset = 1;
5775 #endif
5776                         }
5777 #endif
5778                         if ((inp != NULL) && (stcb != NULL)) {
5779                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5780                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5781                         } else if ((inp != NULL) && (stcb == NULL)) {
5782                                 inp_decr = inp;
5783                         }
5784                         SCTP_STAT_INCR(sctps_badsum);
5785                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5786                         goto out;
5787                 }
5788         }
5789 #endif
5790         /* Destination port of 0 is illegal, based on RFC4960. */
5791         if (sh->dest_port == 0) {
5792                 SCTP_STAT_INCR(sctps_hdrops);
5793                 goto out;
5794         }
5795         stcb = sctp_findassociation_addr(m, offset, src, dst,
5796                                          sh, ch, &inp, &net, vrf_id);
5797 #if defined(INET) || defined(INET6)
5798         if ((net != NULL) && (port != 0)) {
5799                 if (net->port == 0) {
5800                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5801                 }
5802                 net->port = port;
5803         }
5804 #endif
5805 #if defined(__FreeBSD__)
5806         if ((net != NULL) && (use_mflowid != 0)) {
5807                 net->flowid = mflowid;
5808 #ifdef INVARIANTS
5809                 net->flowidset = 1;
5810 #endif
5811         }
5812 #endif
5813         if (inp == NULL) {
5814                 SCTP_STAT_INCR(sctps_noport);
5815 #if defined(__FreeBSD__) && (((__FreeBSD_version < 900000) && (__FreeBSD_version >= 804000)) || (__FreeBSD_version > 900000))
5816                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5817                         goto out;
5818                 }
5819 #endif
5820                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5821                         sctp_send_shutdown_complete2(src, dst, sh,
5822 #if defined(__FreeBSD__)
5823                                                      use_mflowid, mflowid,
5824 #endif
5825                                                      vrf_id, port);
5826                         goto out;
5827                 }
5828                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5829                         goto out;
5830                 }
5831                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5832                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5833                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5834                              (ch->chunk_type != SCTP_INIT))) {
5835                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5836                                                              "Out of the blue");
5837                                 sctp_send_abort(m, iphlen, src, dst,
5838                                                 sh, 0, op_err,
5839 #if defined(__FreeBSD__)
5840                                                 use_mflowid, mflowid,
5841 #endif
5842                                                 vrf_id, port);
5843                         }
5844                 }
5845                 goto out;
5846         } else if (stcb == NULL) {
5847                 inp_decr = inp;
5848         }
5849 #ifdef IPSEC
5850         /*-
5851          * I very much doubt any of the IPSEC stuff will work but I have no
5852          * idea, so I will leave it in place.
5853          */
5854         if (inp != NULL) {
5855                 switch (dst->sa_family) {
5856 #ifdef INET
5857                 case AF_INET:
5858                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5859 #if defined(__FreeBSD__) && (__FreeBSD_version > 1000036)
5860                                 IPSECSTAT_INC(ips_in_polvio);
5861 #else
5862                                 MODULE_GLOBAL(ipsec4stat).in_polvio++;
5863 #endif
5864                                 SCTP_STAT_INCR(sctps_hdrops);
5865                                 goto out;
5866                         }
5867                         break;
5868 #endif
5869 #ifdef INET6
5870                 case AF_INET6:
5871                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5872 #if defined(__FreeBSD__) && (__FreeBSD_version > 1000036)
5873                                 IPSEC6STAT_INC(ips_in_polvio);
5874 #else
5875                                 MODULE_GLOBAL(ipsec6stat).in_polvio++;
5876 #endif
5877                                 SCTP_STAT_INCR(sctps_hdrops);
5878                                 goto out;
5879                         }
5880                         break;
5881 #endif
5882                 default:
5883                         break;
5884                 }
5885         }
5886 #endif
5887         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5888                 (void *)m, iphlen, offset, length, (void *)stcb);
5889         if (stcb) {
5890                 /* always clear this before beginning a packet */
5891                 stcb->asoc.authenticated = 0;
5892                 stcb->asoc.seen_a_sack_this_pkt = 0;
5893                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5894                         (void *)stcb, stcb->asoc.state);
5895
5896                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5897                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5898                         /*-
5899                          * If we hit here, we had a ref count
5900                          * up when the assoc was aborted and the
5901                          * timer is clearing out the assoc, we should
5902                          * NOT respond to any packet.. its OOTB.
5903                          */
5904                         SCTP_TCB_UNLOCK(stcb);
5905                         stcb = NULL;
5906                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5907                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5908                                                      msg);
5909                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5910 #if defined(__FreeBSD__)
5911                                          use_mflowid, mflowid,
5912 #endif
5913                                          vrf_id, port);
5914                         goto out;
5915                 }
5916
5917         }
5918         if (IS_SCTP_CONTROL(ch)) {
5919                 /* process the control portion of the SCTP packet */
5920                 /* sa_ignore NO_NULL_CHK */
5921                 stcb = sctp_process_control(m, iphlen, &offset, length,
5922                                             src, dst, sh, ch,
5923                                             inp, stcb, &net, &fwd_tsn_seen,
5924 #if defined(__FreeBSD__)
5925                                             use_mflowid, mflowid,
5926 #endif
5927                                             vrf_id, port);
5928                 if (stcb) {
5929                         /* This covers us if the cookie-echo was there
5930                          * and it changes our INP.
5931                          */
5932                         inp = stcb->sctp_ep;
5933 #if defined(INET) || defined(INET6)
5934                         if ((net) && (port)) {
5935                                 if (net->port == 0) {
5936                                         sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr));
5937                                 }
5938                                 net->port = port;
5939                         }
5940 #endif
5941                 }
5942         } else {
5943                 /*
5944                  * no control chunks, so pre-process DATA chunks (these
5945                  * checks are taken care of by control processing)
5946                  */
5947
5948                 /*
5949                  * if DATA only packet, and auth is required, then punt...
5950                  * can't have authenticated without any AUTH (control)
5951                  * chunks
5952                  */
5953                 if ((stcb != NULL) &&
5954                     (stcb->asoc.auth_supported == 1) &&
5955                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5956                         /* "silently" ignore */
5957                         SCTP_STAT_INCR(sctps_recvauthmissing);
5958                         goto out;
5959                 }
5960                 if (stcb == NULL) {
5961                         /* out of the blue DATA chunk */
5962                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
5963                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5964                                                      msg);
5965                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5966 #if defined(__FreeBSD__)
5967                                          use_mflowid, mflowid,
5968 #endif
5969                                          vrf_id, port);
5970                         goto out;
5971                 }
5972                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5973                         /* v_tag mismatch! */
5974                         SCTP_STAT_INCR(sctps_badvtag);
5975                         goto out;
5976                 }
5977         }
5978
5979         if (stcb == NULL) {
5980                 /*
5981                  * no valid TCB for this packet, or we found it's a bad
5982                  * packet while processing control, or we're done with this
5983                  * packet (done or skip rest of data), so we drop it...
5984                  */
5985                 goto out;
5986         }
5987
5988         /*
5989          * DATA chunk processing
5990          */
5991         /* plow through the data chunks while length > offset */
5992
5993         /*
5994          * Rest should be DATA only.  Check authentication state if AUTH for
5995          * DATA is required.
5996          */
5997         if ((length > offset) &&
5998             (stcb != NULL) &&
5999             (stcb->asoc.auth_supported == 1) &&
6000             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
6001             !stcb->asoc.authenticated) {
6002                 /* "silently" ignore */
6003                 SCTP_STAT_INCR(sctps_recvauthmissing);
6004                 SCTPDBG(SCTP_DEBUG_AUTH1,
6005                         "Data chunk requires AUTH, skipped\n");
6006                 goto trigger_send;
6007         }
6008         if (length > offset) {
6009                 int retval;
6010
6011                 /*
6012                  * First check to make sure our state is correct. We would
6013                  * not get here unless we really did have a tag, so we don't
6014                  * abort if this happens, just dump the chunk silently.
6015                  */
6016                 switch (SCTP_GET_STATE(&stcb->asoc)) {
6017                 case SCTP_STATE_COOKIE_ECHOED:
6018                         /*
6019                          * we consider data with valid tags in this state
6020                          * shows us the cookie-ack was lost. Imply it was
6021                          * there.
6022                          */
6023                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
6024                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
6025                                                stcb->asoc.overall_error_count,
6026                                                0,
6027                                                SCTP_FROM_SCTP_INPUT,
6028                                                __LINE__);
6029                         }
6030                         stcb->asoc.overall_error_count = 0;
6031                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
6032                         break;
6033                 case SCTP_STATE_COOKIE_WAIT:
6034                         /*
6035                          * We consider OOTB any data sent during asoc setup.
6036                          */
6037                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__);
6038                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6039                                                      msg);
6040                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
6041 #if defined(__FreeBSD__)
6042                                          use_mflowid, mflowid,
6043 #endif
6044                                          vrf_id, port);
6045                         goto out;
6046                         /*sa_ignore NOTREACHED*/
6047                         break;
6048                 case SCTP_STATE_EMPTY:  /* should not happen */
6049                 case SCTP_STATE_INUSE:  /* should not happen */
6050                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
6051                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
6052                 default:
6053                         goto out;
6054                         /*sa_ignore NOTREACHED*/
6055                         break;
6056                 case SCTP_STATE_OPEN:
6057                 case SCTP_STATE_SHUTDOWN_SENT:
6058                         break;
6059                 }
6060                 /* plow through the data chunks while length > offset */
6061                 retval = sctp_process_data(mm, iphlen, &offset, length,
6062                                            src, dst, sh,
6063                                            inp, stcb, net, &high_tsn,
6064 #if defined(__FreeBSD__)
6065                                            use_mflowid, mflowid,
6066 #endif
6067                                            vrf_id, port);
6068                 if (retval == 2) {
6069                         /*
6070                          * The association aborted, NO UNLOCK needed since
6071                          * the association is destroyed.
6072                          */
6073                         stcb = NULL;
6074                         goto out;
6075                 }
6076                 data_processed = 1;
6077                 /*
6078                  * Anything important needs to have been m_copy'ed in
6079                  * process_data
6080                  */
6081         }
6082
6083         /* take care of ecn */
6084         if ((data_processed == 1) &&
6085             (stcb->asoc.ecn_supported == 1) &&
6086             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
6087                 /* Yep, we need to add a ECNE */
6088                 sctp_send_ecn_echo(stcb, net, high_tsn);
6089         }
6090
6091         if ((data_processed == 0) && (fwd_tsn_seen)) {
6092                 int was_a_gap;
6093                 uint32_t highest_tsn;
6094
6095                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
6096                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
6097                 } else {
6098                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
6099                 }
6100                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
6101                 stcb->asoc.send_sack = 1;
6102                 sctp_sack_check(stcb, was_a_gap);
6103         } else if (fwd_tsn_seen) {
6104                 stcb->asoc.send_sack = 1;
6105         }
6106         /* trigger send of any chunks in queue... */
6107 trigger_send:
6108 #ifdef SCTP_AUDITING_ENABLED
6109         sctp_audit_log(0xE0, 2);
6110         sctp_auditing(1, inp, stcb, net);
6111 #endif
6112         SCTPDBG(SCTP_DEBUG_INPUT1,
6113                 "Check for chunk output prw:%d tqe:%d tf=%d\n",
6114                 stcb->asoc.peers_rwnd,
6115                 TAILQ_EMPTY(&stcb->asoc.control_send_queue),
6116                 stcb->asoc.total_flight);
6117         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
6118         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
6119                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
6120         }
6121         if (cnt_ctrl_ready ||
6122             ((un_sent) &&
6123              (stcb->asoc.peers_rwnd > 0 ||
6124               (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
6125                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
6126                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
6127                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6128         }
6129 #ifdef SCTP_AUDITING_ENABLED
6130         sctp_audit_log(0xE0, 3);
6131         sctp_auditing(2, inp, stcb, net);
6132 #endif
6133  out:
6134         if (stcb != NULL) {
6135                 SCTP_TCB_UNLOCK(stcb);
6136         }
6137         if (inp_decr != NULL) {
6138                 /* reduce ref-count */
6139                 SCTP_INP_WLOCK(inp_decr);
6140                 SCTP_INP_DECR_REF(inp_decr);
6141                 SCTP_INP_WUNLOCK(inp_decr);
6142         }
6143 #ifdef INVARIANTS
6144         if (inp != NULL) {
6145                 sctp_validate_no_locks(inp);
6146         }
6147 #endif
6148         return;
6149 }
6150
6151 #if 0
6152 static void
6153 sctp_print_mbuf_chain(struct mbuf *m)
6154 {
6155         for (; m; m = SCTP_BUF_NEXT(m)) {
6156                 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m));
6157                 if (SCTP_BUF_IS_EXTENDED(m))
6158                         SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m));
6159         }
6160 }
6161 #endif
6162
6163 #ifdef INET
6164 #if !defined(__Userspace__)
6165 #if defined(__FreeBSD__) || defined(__APPLE__) || defined(__Windows__)
6166 void
6167 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6168 #elif defined(__Panda__)
6169 void
6170 sctp_input(pakhandle_type i_pak)
6171 #else
6172 void
6173 #if __STDC__
6174 sctp_input(struct mbuf *i_pak,...)
6175 #else
6176 sctp_input(i_pak, va_alist)
6177         struct mbuf *i_pak;
6178 #endif
6179 #endif
6180 {
6181         struct mbuf *m;
6182         int iphlen;
6183         uint32_t vrf_id = 0;
6184         uint8_t ecn_bits;
6185         struct sockaddr_in src, dst;
6186         struct ip *ip;
6187         struct sctphdr *sh;
6188         struct sctp_chunkhdr *ch;
6189         int length, offset;
6190 #if !defined(SCTP_WITH_NO_CSUM)
6191         uint8_t compute_crc;
6192 #endif
6193 #if defined(__FreeBSD__)
6194         uint32_t mflowid;
6195         uint8_t use_mflowid;
6196 #endif
6197 #if !(defined(__FreeBSD__) || defined(__APPLE__) || defined(__Windows__))
6198         uint16_t port = 0;
6199 #endif
6200
6201 #if defined(__Panda__)
6202         /* This is Evil, but its the only way to make panda work right. */
6203         iphlen = sizeof(struct ip);
6204 #else
6205         iphlen = off;
6206 #endif
6207         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6208                 SCTP_RELEASE_PKT(i_pak);
6209                 return;
6210         }
6211         m = SCTP_HEADER_TO_CHAIN(i_pak);
6212 #ifdef __Panda__
6213         SCTP_DETACH_HEADER_FROM_CHAIN(i_pak);
6214         (void)SCTP_RELEASE_HEADER(i_pak);
6215 #endif
6216 #ifdef SCTP_MBUF_LOGGING
6217         /* Log in any input mbufs */
6218         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6219                 struct mbuf *mat;
6220
6221                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
6222                         if (SCTP_BUF_IS_EXTENDED(mat)) {
6223                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
6224                         }
6225                 }
6226         }
6227 #endif
6228 #ifdef SCTP_PACKET_LOGGING
6229         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6230                 sctp_packet_log(m);
6231         }
6232 #endif
6233 #if defined(__FreeBSD__)
6234 #if __FreeBSD_version > 1000049
6235         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6236                 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6237                 m->m_pkthdr.len,
6238                 if_name(m->m_pkthdr.rcvif),
6239                 (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6240 #elif __FreeBSD_version >= 800000
6241         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6242                 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
6243                 m->m_pkthdr.len,
6244                 if_name(m->m_pkthdr.rcvif),
6245                 m->m_pkthdr.csum_flags);
6246 #else
6247         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6248                 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
6249                 m->m_pkthdr.len,
6250                 m->m_pkthdr.rcvif->if_xname,
6251                 m->m_pkthdr.csum_flags);
6252 #endif
6253 #endif
6254 #if defined(__APPLE__)
6255         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6256                 "sctp_input(): Packet of length %d received on %s%d with csum_flags 0x%x.\n",
6257                 m->m_pkthdr.len,
6258                 m->m_pkthdr.rcvif->if_name,
6259                 m->m_pkthdr.rcvif->if_unit,
6260                 m->m_pkthdr.csum_flags);
6261 #endif
6262 #if defined(__Windows__)
6263         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6264                 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
6265                 m->m_pkthdr.len,
6266                 m->m_pkthdr.rcvif->if_xname,
6267                 m->m_pkthdr.csum_flags);
6268 #endif
6269 #if defined(__FreeBSD__)
6270         if (m->m_flags & M_FLOWID) {
6271                 mflowid = m->m_pkthdr.flowid;
6272                 use_mflowid = 1;
6273         } else {
6274                 mflowid = 0;
6275                 use_mflowid = 0;
6276         }
6277 #endif
6278         SCTP_STAT_INCR(sctps_recvpackets);
6279         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6280         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6281         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6282         if (SCTP_BUF_LEN(m) < offset) {
6283                 if ((m = m_pullup(m, offset)) == NULL) {
6284                         SCTP_STAT_INCR(sctps_hdrops);
6285                         return;
6286                 }
6287         }
6288         ip = mtod(m, struct ip *);
6289         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6290         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6291         offset -= sizeof(struct sctp_chunkhdr);
6292         memset(&src, 0, sizeof(struct sockaddr_in));
6293         src.sin_family = AF_INET;
6294 #ifdef HAVE_SIN_LEN
6295         src.sin_len = sizeof(struct sockaddr_in);
6296 #endif
6297         src.sin_port = sh->src_port;
6298         src.sin_addr = ip->ip_src;
6299         memset(&dst, 0, sizeof(struct sockaddr_in));
6300         dst.sin_family = AF_INET;
6301 #ifdef HAVE_SIN_LEN
6302         dst.sin_len = sizeof(struct sockaddr_in);
6303 #endif
6304         dst.sin_port = sh->dest_port;
6305         dst.sin_addr = ip->ip_dst;
6306 #if defined(__Windows__)
6307         NTOHS(ip->ip_len);
6308 #endif
6309 #if defined(__Userspace_os_Linux) || defined(__Userspace_os_Windows)
6310         ip->ip_len = ntohs(ip->ip_len);
6311 #endif
6312 #if defined(__FreeBSD__)
6313 #if __FreeBSD_version >= 1000000
6314         length = ntohs(ip->ip_len);
6315 #else
6316         length = ip->ip_len + iphlen;
6317 #endif
6318 #elif defined(__APPLE__)
6319         length = ip->ip_len + iphlen;
6320 #elif defined(__Userspace__)
6321 #if defined(__Userspace_os_Linux) || defined(__Userspace_os_Windows)
6322         length = ip->ip_len;
6323 #else
6324         length = ip->ip_len + iphlen;
6325 #endif
6326 #else
6327         length = ip->ip_len;
6328 #endif
6329         /* Validate mbuf chain length with IP payload length. */
6330         if (SCTP_HEADER_LEN(m) != length) {
6331                 SCTPDBG(SCTP_DEBUG_INPUT1,
6332                         "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6333                 SCTP_STAT_INCR(sctps_hdrops);
6334                 goto out;
6335         }
6336         /* SCTP does not allow broadcasts or multicasts */
6337         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6338                 goto out;
6339         }
6340         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6341                 goto out;
6342         }
6343         ecn_bits = ip->ip_tos;
6344 #if defined(SCTP_WITH_NO_CSUM)
6345         SCTP_STAT_INCR(sctps_recvnocrc);
6346 #else
6347 #if defined(__FreeBSD__) && __FreeBSD_version >= 800000
6348         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6349                 SCTP_STAT_INCR(sctps_recvhwcrc);
6350                 compute_crc = 0;
6351         } else {
6352 #else
6353         if (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
6354             ((src.sin_addr.s_addr == dst.sin_addr.s_addr) ||
6355              (SCTP_IS_IT_LOOPBACK(m)))) {
6356                 SCTP_STAT_INCR(sctps_recvnocrc);
6357                 compute_crc = 0;
6358         } else {
6359 #endif
6360                 SCTP_STAT_INCR(sctps_recvswcrc);
6361                 compute_crc = 1;
6362         }
6363 #endif
6364         sctp_common_input_processing(&m, iphlen, offset, length,
6365                                      (struct sockaddr *)&src,
6366                                      (struct sockaddr *)&dst,
6367                                      sh, ch,
6368 #if !defined(SCTP_WITH_NO_CSUM)
6369                                      compute_crc,
6370 #endif
6371                                      ecn_bits,
6372 #if defined(__FreeBSD__)
6373                                      use_mflowid, mflowid,
6374 #endif
6375                                      vrf_id, port);
6376  out:
6377         if (m) {
6378                 sctp_m_freem(m);
6379         }
6380         return;
6381 }
6382
6383 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6384 extern int *sctp_cpuarry;
6385 #endif
6386
6387 #if defined(__FreeBSD__) && __FreeBSD_version >= 1100020
6388 int
6389 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6390 {
6391         struct mbuf *m;
6392         int off;
6393
6394         m = *mp;
6395         off = *offp;
6396 #else
6397 void
6398 sctp_input(struct mbuf *m, int off)
6399 {
6400 #endif
6401 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6402         if (mp_ncpus > 1) {
6403                 struct ip *ip;
6404                 struct sctphdr *sh;
6405                 int offset;
6406                 int cpu_to_use;
6407                 uint32_t flowid, tag;
6408
6409                 if (m->m_flags & M_FLOWID) {
6410                         flowid = m->m_pkthdr.flowid;
6411                 } else {
6412                         /* No flow id built by lower layers
6413                          * fix it so we create one.
6414                          */
6415                         offset = off + sizeof(struct sctphdr);
6416                         if (SCTP_BUF_LEN(m) < offset) {
6417                                 if ((m = m_pullup(m, offset)) == NULL) {
6418                                         SCTP_STAT_INCR(sctps_hdrops);
6419 #if defined(__FreeBSD__) && __FreeBSD_version >= 1100020
6420                                         return (IPPROTO_DONE);
6421 #else
6422                                         return;
6423 #endif
6424                                 }
6425                         }
6426                         ip = mtod(m, struct ip *);
6427                         sh = (struct sctphdr *)((caddr_t)ip + off);
6428                         tag = htonl(sh->v_tag);
6429                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6430                         m->m_pkthdr.flowid = flowid;
6431                         m->m_flags |= M_FLOWID;
6432                 }
6433                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6434                 sctp_queue_to_mcore(m, off, cpu_to_use);
6435 #if defined(__FreeBSD__) && __FreeBSD_version >= 1100020
6436                 return (IPPROTO_DONE);
6437 #else
6438                 return;
6439 #endif
6440         }
6441 #endif
6442         sctp_input_with_port(m, off, 0);
6443 #if defined(__FreeBSD__) && __FreeBSD_version >= 1100020
6444         return (IPPROTO_DONE);
6445 #endif
6446 }
6447 #endif
6448 #endif