ext/sctp/usrsctp/usrsctplib/netinet/sctp_input.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #if defined(__FreeBSD__) && !defined(__Userspace__)
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 363194 2020-07-14 20:32:50Z tuexen $");
  38 #endif
  39
  40 #include <netinet/sctp_os.h>
  41 #include <netinet/sctp_var.h>
  42 #include <netinet/sctp_sysctl.h>
  43 #include <netinet/sctp_pcb.h>
  44 #include <netinet/sctp_header.h>
  45 #include <netinet/sctputil.h>
  46 #include <netinet/sctp_output.h>
  47 #include <netinet/sctp_input.h>
  48 #include <netinet/sctp_auth.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_asconf.h>
  51 #include <netinet/sctp_bsd_addr.h>
  52 #include <netinet/sctp_timer.h>
  53 #include <netinet/sctp_crc32.h>
  54 #if defined(__FreeBSD__) && !defined(__Userspace__)
  55 #include <netinet/sctp_kdtrace.h>
  56 #endif
  57 #if defined(INET) || defined(INET6)
  58 #if !defined(_WIN32)
  59 #include <netinet/udp.h>
  60 #endif
  61 #endif
  62 #if defined(__FreeBSD__) && !defined(__Userspace__)
  63 #include <sys/smp.h>
  64 #endif
  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, struct sctp_nets *net, int *abort_no_unlock,
  98 #if defined(__FreeBSD__) && !defined(__Userspace__)
  99                  uint8_t mflowtype, 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__) && !defined(__Userspace__)
 116                                        mflowtype, 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__) && !defined(__Userspace__)
 130                                        mflowtype, 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__) && !defined(__Userspace__)
 142                                        mflowtype, 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__) && !defined(__Userspace__)
 154                                        mflowtype, 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__) && !defined(__Userspace__)
 166                                        mflowtype, 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__) && !defined(__Userspace__)
 180                                        mflowtype, 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 listening socket.*/
 188         if ((stcb == NULL) &&
 189             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 190              (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 191              (!SCTP_IS_LISTENING(inp)))) {
 192                 /*
 193                  * FIX ME ?? What about TCP model and we have a
 194                  * match/restart case? Actually no fix is needed.
 195                  * the lookup will always find the existing assoc so stcb
 196                  * would not be NULL. It may be questionable to do this
 197                  * since we COULD just send back the INIT-ACK and hope that
 198                  * the app did accept()'s by the time the COOKIE was sent. But
 199                  * there is a price to pay for COOKIE generation and I don't
 200                  * want to pay it on the chance that the app will actually do
 201                  * some accepts(). The App just looses and should NOT be in
 202                  * this state :-)
 203                  */
 204                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 205                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 206                                                      "No listener");
 207                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 208 #if defined(__FreeBSD__) && !defined(__Userspace__)
 209                                         mflowtype, mflowid, inp->fibnum,
 210 #endif
 211                                         vrf_id, port);
 212                 }
 213                 goto outnow;
 214         }
 215         if ((stcb != NULL) &&
 216             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 217                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 218                 sctp_send_shutdown_ack(stcb, NULL);
 219                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 220         } else {
 221                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 222                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 223                                        src, dst, sh, cp,
 224 #if defined(__FreeBSD__) && !defined(__Userspace__)
 225                                        mflowtype, mflowid,
 226 #endif
 227                                        vrf_id, port);
 228         }
 229  outnow:
 230         if (stcb == NULL) {
 231                 SCTP_INP_RUNLOCK(inp);
 232         }
 233 }
 234
 235 /*
 236  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 237  */
 238
 239 int
 240 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked)
 241 {
 242         int unsent_data;
 243         unsigned int i;
 244         struct sctp_stream_queue_pending *sp;
 245         struct sctp_association *asoc;
 246
 247         /* This function returns if any stream has true unsent data on it.
 248          * Note that as it looks through it will clean up any places that
 249          * have old data that has been sent but left at top of stream queue.
 250          */
 251         asoc = &stcb->asoc;
 252         unsent_data = 0;
 253         SCTP_TCB_SEND_LOCK(stcb);
 254         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 255                 /* Check to see if some data queued */
 256                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 257                         /*sa_ignore FREED_MEMORY*/
 258                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 259                         if (sp == NULL) {
 260                                 continue;
 261                         }
 262                         if ((sp->msg_is_complete) &&
 263                             (sp->length == 0)  &&
 264                             (sp->sender_all_done)) {
 265                                 /* We are doing differed cleanup. Last
 266                                  * time through when we took all the data
 267                                  * the sender_all_done was not set.
 268                                  */
 269                                 if (sp->put_last_out == 0) {
 270                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 271                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 272                                                     sp->sender_all_done,
 273                                                     sp->length,
 274                                                     sp->msg_is_complete,
 275                                                     sp->put_last_out);
 276                                 }
 277                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 278                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 279                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
 280                                 if (sp->net) {
 281                                         sctp_free_remote_addr(sp->net);
 282                                         sp->net = NULL;
 283                                 }
 284                                 if (sp->data) {
 285                                         sctp_m_freem(sp->data);
 286                                         sp->data = NULL;
 287                                 }
 288                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 289                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 290                                         unsent_data++;
 291                                 }
 292                         } else {
 293                                 unsent_data++;
 294                         }
 295                         if (unsent_data > 0) {
 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.sid >= newcnt) {
 341                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 342                                 asoc->send_queue_cnt--;
 343                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 344                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 345 #ifdef INVARIANTS
 346                                 } else {
 347                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 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                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 368                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 369                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
 370                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 371                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 372                                         if (sp->data) {
 373                                                 sctp_m_freem(sp->data);
 374                                                 sp->data = NULL;
 375                                         }
 376                                         if (sp->net) {
 377                                                 sctp_free_remote_addr(sp->net);
 378                                                 sp->net = NULL;
 379                                         }
 380                                         /* Free the chunk */
 381                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 382                                         /*sa_ignore FREED_MEMORY*/
 383                                 }
 384                                 outs->state = SCTP_STREAM_CLOSED;
 385                         }
 386                 }
 387                 /* cut back the count */
 388                 asoc->pre_open_streams = newcnt;
 389         }
 390         SCTP_TCB_SEND_UNLOCK(stcb);
 391         asoc->streamoutcnt = asoc->pre_open_streams;
 392         if (asoc->strmout) {
 393                 for (i = 0; i < asoc->streamoutcnt; i++) {
 394                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 395                 }
 396         }
 397         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 398         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 399         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 400                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 401         }
 402         /* This is the next one we expect */
 403         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 404
 405         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 406         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 407
 408         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 409         /* open the requested streams */
 410
 411         if (asoc->strmin != NULL) {
 412                 /* Free the old ones */
 413                 for (i = 0; i < asoc->streamincnt; i++) {
 414                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 415                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 416                 }
 417                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 418         }
 419         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 420                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 421         } else {
 422                 asoc->streamincnt = asoc->max_inbound_streams;
 423         }
 424         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 425                     sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 426         if (asoc->strmin == NULL) {
 427                 /* we didn't get memory for the streams! */
 428                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 429                 return (-1);
 430         }
 431         for (i = 0; i < asoc->streamincnt; i++) {
 432                 asoc->strmin[i].sid = i;
 433                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 434                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 435                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 436                 asoc->strmin[i].pd_api_started = 0;
 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__) && !defined(__Userspace__)
 461                       uint8_t mflowtype, 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, cookie_found;
 468         int initack_limit;
 469         int nat_friendly = 0;
 470
 471         /* First verify that we have no illegal param's */
 472         abort_flag = 0;
 473         cookie_found = 0;
 474
 475         op_err = sctp_arethere_unrecognized_parameters(m,
 476                                                        (offset + sizeof(struct sctp_init_chunk)),
 477                                                        &abort_flag, (struct sctp_chunkhdr *)cp,
 478                                                        &nat_friendly, &cookie_found);
 479         if (abort_flag) {
 480                 /* Send an abort and notify peer */
 481                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 482                 *abort_no_unlock = 1;
 483                 return (-1);
 484         }
 485         if (!cookie_found) {
 486                 uint16_t len;
 487
 488                 /* Only report the missing cookie parameter */
 489                 if (op_err != NULL) {
 490                         sctp_m_freem(op_err);
 491                 }
 492                 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 493                 /* We abort with an error of missing mandatory param */
 494                 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 495                 if (op_err != NULL) {
 496                         struct sctp_error_missing_param *cause;
 497
 498                         SCTP_BUF_LEN(op_err) = len;
 499                         cause = mtod(op_err, struct sctp_error_missing_param *);
 500                         /* Subtract the reserved param */
 501                         cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 502                         cause->cause.length = htons(len);
 503                         cause->num_missing_params = htonl(1);
 504                         cause->type[0] = htons(SCTP_STATE_COOKIE);
 505                 }
 506                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 507                                        src, dst, sh, op_err,
 508 #if defined(__FreeBSD__) && !defined(__Userspace__)
 509                                        mflowtype, mflowid,
 510 #endif
 511                                        vrf_id, net->port);
 512                 *abort_no_unlock = 1;
 513                 return (-3);
 514         }
 515         asoc = &stcb->asoc;
 516         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 517         /* process the peer's parameters in the INIT-ACK */
 518         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 519         if (retval < 0) {
 520                 if (op_err != NULL) {
 521                         sctp_m_freem(op_err);
 522                 }
 523                 return (retval);
 524         }
 525         initack_limit = offset + ntohs(cp->ch.chunk_length);
 526         /* load all addresses */
 527         if ((retval = sctp_load_addresses_from_init(stcb, m,
 528             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 529             src, dst, NULL, stcb->asoc.port))) {
 530                 if (op_err != NULL) {
 531                         sctp_m_freem(op_err);
 532                 }
 533                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 534                                              "Problem with address parameters");
 535                 SCTPDBG(SCTP_DEBUG_INPUT1,
 536                         "Load addresses from INIT causes an abort %d\n",
 537                         retval);
 538                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 539                                        src, dst, sh, op_err,
 540 #if defined(__FreeBSD__) && !defined(__Userspace__)
 541                                        mflowtype, mflowid,
 542 #endif
 543                                        vrf_id, net->port);
 544                 *abort_no_unlock = 1;
 545                 return (-1);
 546         }
 547         /* if the peer doesn't support asconf, flush the asconf queue */
 548         if (asoc->asconf_supported == 0) {
 549                 struct sctp_asconf_addr *param, *nparam;
 550
 551                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 552                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 553                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 554                 }
 555         }
 556
 557         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 558             stcb->asoc.local_hmacs);
 559         if (op_err) {
 560                 sctp_queue_op_err(stcb, op_err);
 561                 /* queuing will steal away the mbuf chain to the out queue */
 562                 op_err = NULL;
 563         }
 564         /* extract the cookie and queue it to "echo" it back... */
 565         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 566                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 567                                stcb->asoc.overall_error_count,
 568                                0,
 569                                SCTP_FROM_SCTP_INPUT,
 570                                __LINE__);
 571         }
 572         stcb->asoc.overall_error_count = 0;
 573         net->error_count = 0;
 574
 575         /*
 576          * Cancel the INIT timer, We do this first before queueing the
 577          * cookie. We always cancel at the primary to assue that we are
 578          * canceling the timer started by the INIT which always goes to the
 579          * primary.
 580          */
 581         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 582             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 583
 584         /* calculate the RTO */
 585         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 586                            SCTP_RTT_FROM_NON_DATA);
 587 #if defined(__Userspace__)
 588         if (stcb->sctp_ep->recv_callback) {
 589                 if (stcb->sctp_socket) {
 590                         uint32_t inqueue_bytes, sb_free_now;
 591                         struct sctp_inpcb *inp;
 592
 593                         inp = stcb->sctp_ep;
 594                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
 595                         sb_free_now = SCTP_SB_LIMIT_SND(stcb->sctp_socket) - (inqueue_bytes + stcb->asoc.sb_send_resv);
 596
 597                         /* check if the amount free in the send socket buffer crossed the threshold */
 598                         if (inp->send_callback &&
 599                             (((inp->send_sb_threshold > 0) &&
 600                               (sb_free_now >= inp->send_sb_threshold) &&
 601                               (stcb->asoc.chunks_on_out_queue <= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) ||
 602                              (inp->send_sb_threshold == 0))) {
 603                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 604                                 SCTP_TCB_UNLOCK(stcb);
 605                                 inp->send_callback(stcb->sctp_socket, sb_free_now);
 606                                 SCTP_TCB_LOCK(stcb);
 607                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 608                         }
 609                 }
 610         }
 611 #endif
 612         retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
 613         return (retval);
 614 }
 615
 616 static void
 617 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 618     struct sctp_tcb *stcb, struct sctp_nets *net)
 619 {
 620         union sctp_sockstore store;
 621         struct sctp_nets *r_net, *f_net;
 622         struct timeval tv;
 623         int req_prim = 0;
 624         uint16_t old_error_counter;
 625
 626         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 627                 /* Invalid length */
 628                 return;
 629         }
 630
 631         memset(&store, 0, sizeof(store));
 632         switch (cp->heartbeat.hb_info.addr_family) {
 633 #ifdef INET
 634         case AF_INET:
 635                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 636                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 637 #ifdef HAVE_SIN_LEN
 638                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 639 #endif
 640                         store.sin.sin_port = stcb->rport;
 641                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 642                                sizeof(store.sin.sin_addr));
 643                 } else {
 644                         return;
 645                 }
 646                 break;
 647 #endif
 648 #ifdef INET6
 649         case AF_INET6:
 650                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 651                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 652 #ifdef HAVE_SIN6_LEN
 653                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 654 #endif
 655                         store.sin6.sin6_port = stcb->rport;
 656                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 657                 } else {
 658                         return;
 659                 }
 660                 break;
 661 #endif
 662 #if defined(__Userspace__)
 663         case AF_CONN:
 664                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_conn)) {
 665                         store.sconn.sconn_family = cp->heartbeat.hb_info.addr_family;
 666 #ifdef HAVE_SCONN_LEN
 667                         store.sconn.sconn_len = cp->heartbeat.hb_info.addr_len;
 668 #endif
 669                         store.sconn.sconn_port = stcb->rport;
 670                         memcpy(&store.sconn.sconn_addr, cp->heartbeat.hb_info.address, sizeof(void *));
 671                 } else {
 672                         return;
 673                 }
 674                 break;
 675 #endif
 676         default:
 677                 return;
 678         }
 679         r_net = sctp_findnet(stcb, &store.sa);
 680         if (r_net == NULL) {
 681                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 682                 return;
 683         }
 684         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 685             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 686             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 687                 /*
 688                  * If the its a HB and it's random value is correct when can
 689                  * confirm the destination.
 690                  */
 691                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 692                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 693                         stcb->asoc.primary_destination = r_net;
 694                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 695                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 696                         if (f_net != r_net) {
 697                                 /* first one on the list is NOT the primary
 698                                  * sctp_cmpaddr() is much more efficient if
 699                                  * the primary is the first on the list, make it
 700                                  * so.
 701                                  */
 702                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 703                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 704                         }
 705                         req_prim = 1;
 706                 }
 707                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 708                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 709                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 710                                 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 711                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 712         }
 713         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 714                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 715                                stcb->asoc.overall_error_count,
 716                                0,
 717                                SCTP_FROM_SCTP_INPUT,
 718                                __LINE__);
 719         }
 720         stcb->asoc.overall_error_count = 0;
 721         old_error_counter = r_net->error_count;
 722         r_net->error_count = 0;
 723         r_net->hb_responded = 1;
 724         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 725         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 726         /* Now lets do a RTO with this */
 727         sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
 728                            SCTP_RTT_FROM_NON_DATA);
 729         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 730                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 731                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 732                                 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 733         }
 734         if (r_net->dest_state & SCTP_ADDR_PF) {
 735                 r_net->dest_state &= ~SCTP_ADDR_PF;
 736                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 737         }
 738         if (old_error_counter > 0) {
 739                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 740                                 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 741                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 742         }
 743         if (r_net == stcb->asoc.primary_destination) {
 744                 if (stcb->asoc.alternate) {
 745                         /* release the alternate, primary is good */
 746                         sctp_free_remote_addr(stcb->asoc.alternate);
 747                         stcb->asoc.alternate = NULL;
 748                 }
 749         }
 750         /* Mobility adaptation */
 751         if (req_prim) {
 752                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 753                                                  SCTP_MOBILITY_BASE) ||
 754                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 755                                                 SCTP_MOBILITY_FASTHANDOFF)) &&
 756                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 757                                                 SCTP_MOBILITY_PRIM_DELETED)) {
 758
 759                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 760                                         stcb->sctp_ep, stcb, NULL,
 761                                         SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 762                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 763                                         SCTP_MOBILITY_FASTHANDOFF)) {
 764                                 sctp_assoc_immediate_retrans(stcb,
 765                                         stcb->asoc.primary_destination);
 766                         }
 767                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 768                                         SCTP_MOBILITY_BASE)) {
 769                                 sctp_move_chunks_from_net(stcb,
 770                                         stcb->asoc.deleted_primary);
 771                         }
 772                         sctp_delete_prim_timer(stcb->sctp_ep, stcb);
 773                 }
 774         }
 775 }
 776
 777 static int
 778 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 779 {
 780         /*
 781          * Return 0 means we want you to proceed with the abort
 782          * non-zero means no abort processing.
 783          */
 784         uint32_t new_vtag;
 785         struct sctpasochead *head;
 786
 787         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 788             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 789                 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 790                 atomic_add_int(&stcb->asoc.refcnt, 1);
 791                 SCTP_TCB_UNLOCK(stcb);
 792                 SCTP_INP_INFO_WLOCK();
 793                 SCTP_TCB_LOCK(stcb);
 794                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 795         } else {
 796                 return (0);
 797         }
 798         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
 799                 /* generate a new vtag and send init */
 800                 LIST_REMOVE(stcb, sctp_asocs);
 801                 stcb->asoc.my_vtag = new_vtag;
 802                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 803                 /* put it in the bucket in the vtag hash of assoc's for the system */
 804                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 805                 SCTP_INP_INFO_WUNLOCK();
 806                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 807                 return (1);
 808         } else {
 809                 /* treat like a case where the cookie expired i.e.:
 810                 * - dump current cookie.
 811                 * - generate a new vtag.
 812                 * - resend init.
 813                 */
 814                 /* generate a new vtag and send init */
 815                 LIST_REMOVE(stcb, sctp_asocs);
 816                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 817                 sctp_stop_all_cookie_timers(stcb);
 818                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 819                 stcb->asoc.my_vtag = new_vtag;
 820                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 821                 /* put it in the bucket in the vtag hash of assoc's for the system */
 822                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 823                 SCTP_INP_INFO_WUNLOCK();
 824                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 825                 return (1);
 826         }
 827         return (0);
 828 }
 829
 830 static int
 831 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 832                               struct sctp_nets *net)
 833 {
 834         /* return 0 means we want you to proceed with the abort
 835          * non-zero means no abort processing
 836          */
 837         if (stcb->asoc.auth_supported == 0) {
 838                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 839                 return (0);
 840         }
 841         sctp_asconf_send_nat_state_update(stcb, net);
 842         return (1);
 843 }
 844
 845
 846 /* Returns 1 if the stcb was aborted, 0 otherwise */
 847 static int
 848 sctp_handle_abort(struct sctp_abort_chunk *abort,
 849     struct sctp_tcb *stcb, struct sctp_nets *net)
 850 {
 851 #if defined(__APPLE__) && !defined(__Userspace__)
 852         struct socket *so;
 853 #endif
 854         uint16_t len;
 855         uint16_t error;
 856
 857         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 858         if (stcb == NULL)
 859                 return (0);
 860
 861         len = ntohs(abort->ch.chunk_length);
 862         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
 863                 /* Need to check the cause codes for our
 864                  * two magic nat aborts which don't kill the assoc
 865                  * necessarily.
 866                  */
 867                 struct sctp_error_cause *cause;
 868
 869                 cause = (struct sctp_error_cause *)(abort + 1);
 870                 error = ntohs(cause->code);
 871                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 872                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n",
 873                                                    abort->ch.chunk_flags);
 874                         if (sctp_handle_nat_colliding_state(stcb)) {
 875                                 return (0);
 876                         }
 877                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 878                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n",
 879                                                    abort->ch.chunk_flags);
 880                         if (sctp_handle_nat_missing_state(stcb, net)) {
 881                                 return (0);
 882                         }
 883                 }
 884         } else {
 885                 error = 0;
 886         }
 887         /* stop any receive timers */
 888         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
 889                         SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 890         /* notify user of the abort and clean up... */
 891         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 892         /* free the tcb */
 893         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 894         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 895             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 896                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 897         }
 898 #ifdef SCTP_ASOCLOG_OF_TSNS
 899         sctp_print_out_track_log(stcb);
 900 #endif
 901 #if defined(__APPLE__) && !defined(__Userspace__)
 902         so = SCTP_INP_SO(stcb->sctp_ep);
 903         atomic_add_int(&stcb->asoc.refcnt, 1);
 904         SCTP_TCB_UNLOCK(stcb);
 905         SCTP_SOCKET_LOCK(so, 1);
 906         SCTP_TCB_LOCK(stcb);
 907         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 908 #endif
 909         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED);
 910         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 911                               SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 912 #if defined(__APPLE__) && !defined(__Userspace__)
 913         SCTP_SOCKET_UNLOCK(so, 1);
 914 #endif
 915         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 916         return (1);
 917 }
 918
 919 static void
 920 sctp_start_net_timers(struct sctp_tcb *stcb)
 921 {
 922         uint32_t cnt_hb_sent;
 923         struct sctp_nets *net;
 924
 925         cnt_hb_sent = 0;
 926         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 927                 /* For each network start:
 928                  * 1) A pmtu timer.
 929                  * 2) A HB timer
 930                  * 3) If the dest in unconfirmed send
 931                  *    a hb as well if under max_hb_burst have
 932                  *    been sent.
 933                  */
 934                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 935                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 936                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 937                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 938                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 939                         cnt_hb_sent++;
 940                 }
 941         }
 942         if (cnt_hb_sent) {
 943                 sctp_chunk_output(stcb->sctp_ep, stcb,
 944                                   SCTP_OUTPUT_FROM_COOKIE_ACK,
 945                                   SCTP_SO_NOT_LOCKED);
 946         }
 947 }
 948
 949
 950 static void
 951 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 952     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 953 {
 954         struct sctp_association *asoc;
 955         int some_on_streamwheel;
 956         int old_state;
 957 #if defined(__APPLE__) && !defined(__Userspace__)
 958         struct socket *so;
 959 #endif
 960
 961         SCTPDBG(SCTP_DEBUG_INPUT2,
 962                 "sctp_handle_shutdown: handling SHUTDOWN\n");
 963         if (stcb == NULL)
 964                 return;
 965         asoc = &stcb->asoc;
 966         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 967             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 968                 return;
 969         }
 970         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 971                 /* Shutdown NOT the expected size */
 972                 return;
 973         }
 974         old_state = SCTP_GET_STATE(stcb);
 975         sctp_update_acked(stcb, cp, abort_flag);
 976         if (*abort_flag) {
 977                 return;
 978         }
 979         if (asoc->control_pdapi) {
 980                 /* With a normal shutdown
 981                  * we assume the end of last record.
 982                  */
 983                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 984                 if (asoc->control_pdapi->on_strm_q) {
 985                         struct sctp_stream_in *strm;
 986
 987                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 988                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 989                                 /* Unordered */
 990                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 991                                 asoc->control_pdapi->on_strm_q = 0;
 992                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 993                                 /* Ordered */
 994                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 995                                 asoc->control_pdapi->on_strm_q = 0;
 996 #ifdef INVARIANTS
 997                         } else {
 998                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 999                                       asoc->control_pdapi,
1000                                       asoc->control_pdapi->on_strm_q);
1001 #endif
1002                         }
1003                 }
1004                 asoc->control_pdapi->end_added = 1;
1005                 asoc->control_pdapi->pdapi_aborted = 1;
1006                 asoc->control_pdapi = NULL;
1007                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1008 #if defined(__APPLE__) && !defined(__Userspace__)
1009                 so = SCTP_INP_SO(stcb->sctp_ep);
1010                 atomic_add_int(&stcb->asoc.refcnt, 1);
1011                 SCTP_TCB_UNLOCK(stcb);
1012                 SCTP_SOCKET_LOCK(so, 1);
1013                 SCTP_TCB_LOCK(stcb);
1014                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1015                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1016                         /* assoc was freed while we were unlocked */
1017                         SCTP_SOCKET_UNLOCK(so, 1);
1018                         return;
1019                 }
1020 #endif
1021                 if (stcb->sctp_socket) {
1022                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1023                 }
1024 #if defined(__APPLE__) && !defined(__Userspace__)
1025                 SCTP_SOCKET_UNLOCK(so, 1);
1026 #endif
1027         }
1028         /* goto SHUTDOWN_RECEIVED state to block new requests */
1029         if (stcb->sctp_socket) {
1030                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1031                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
1032                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1033                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
1034                         /* notify upper layer that peer has initiated a shutdown */
1035                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1036
1037                         /* reset time */
1038                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
1039                 }
1040         }
1041         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
1042                 /*
1043                  * stop the shutdown timer, since we WILL move to
1044                  * SHUTDOWN-ACK-SENT.
1045                  */
1046                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
1047                                 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
1048         }
1049         /* Now is there unsent data on a stream somewhere? */
1050         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
1051
1052         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1053             !TAILQ_EMPTY(&asoc->sent_queue) ||
1054             some_on_streamwheel) {
1055                 /* By returning we will push more data out */
1056                 return;
1057         } else {
1058                 /* no outstanding data to send, so move on... */
1059                 /* send SHUTDOWN-ACK */
1060                 /* move to SHUTDOWN-ACK-SENT state */
1061                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
1062                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
1063                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
1064                 }
1065                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
1066                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
1067                         sctp_stop_timers_for_shutdown(stcb);
1068                         sctp_send_shutdown_ack(stcb, net);
1069                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
1070                                          stcb->sctp_ep, stcb, net);
1071                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1072                         sctp_send_shutdown_ack(stcb, net);
1073                 }
1074         }
1075 }
1076
1077 static void
1078 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
1079                          struct sctp_tcb *stcb,
1080                          struct sctp_nets *net)
1081 {
1082         struct sctp_association *asoc;
1083 #if defined(__APPLE__) && !defined(__Userspace__)
1084         struct socket *so;
1085
1086         so = SCTP_INP_SO(stcb->sctp_ep);
1087 #endif
1088         SCTPDBG(SCTP_DEBUG_INPUT2,
1089                 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1090         if (stcb == NULL)
1091                 return;
1092
1093         asoc = &stcb->asoc;
1094         /* process according to association state */
1095         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1096             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1097                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1098                 sctp_send_shutdown_complete(stcb, net, 1);
1099                 SCTP_TCB_UNLOCK(stcb);
1100                 return;
1101         }
1102         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
1103             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1104                 /* unexpected SHUTDOWN-ACK... so ignore... */
1105                 SCTP_TCB_UNLOCK(stcb);
1106                 return;
1107         }
1108         if (asoc->control_pdapi) {
1109                 /* With a normal shutdown
1110                  * we assume the end of last record.
1111                  */
1112                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1113                 asoc->control_pdapi->end_added = 1;
1114                 asoc->control_pdapi->pdapi_aborted = 1;
1115                 asoc->control_pdapi = NULL;
1116                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1117 #if defined(__APPLE__) && !defined(__Userspace__)
1118                 atomic_add_int(&stcb->asoc.refcnt, 1);
1119                 SCTP_TCB_UNLOCK(stcb);
1120                 SCTP_SOCKET_LOCK(so, 1);
1121                 SCTP_TCB_LOCK(stcb);
1122                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1123                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1124                         /* assoc was freed while we were unlocked */
1125                         SCTP_SOCKET_UNLOCK(so, 1);
1126                         return;
1127                 }
1128 #endif
1129                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1130 #if defined(__APPLE__) && !defined(__Userspace__)
1131                 SCTP_SOCKET_UNLOCK(so, 1);
1132 #endif
1133         }
1134 #ifdef INVARIANTS
1135         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1136             !TAILQ_EMPTY(&asoc->sent_queue) ||
1137             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
1138                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1139         }
1140 #endif
1141         /* stop the timer */
1142         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1143                         SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1144         /* send SHUTDOWN-COMPLETE */
1145         sctp_send_shutdown_complete(stcb, net, 0);
1146         /* notify upper layer protocol */
1147         if (stcb->sctp_socket) {
1148                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1149                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1150                         stcb->sctp_socket->so_snd.sb_cc = 0;
1151                 }
1152                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1153         }
1154         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1155         /* free the TCB but first save off the ep */
1156 #if defined(__APPLE__) && !defined(__Userspace__)
1157         atomic_add_int(&stcb->asoc.refcnt, 1);
1158         SCTP_TCB_UNLOCK(stcb);
1159         SCTP_SOCKET_LOCK(so, 1);
1160         SCTP_TCB_LOCK(stcb);
1161         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1162 #endif
1163         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1164                               SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1165 #if defined(__APPLE__) && !defined(__Userspace__)
1166         SCTP_SOCKET_UNLOCK(so, 1);
1167 #endif
1168 }
1169
1170 static void
1171 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
1172 {
1173         switch (chunk_type) {
1174         case SCTP_ASCONF_ACK:
1175         case SCTP_ASCONF:
1176                 sctp_asconf_cleanup(stcb);
1177                 break;
1178         case SCTP_IFORWARD_CUM_TSN:
1179         case SCTP_FORWARD_CUM_TSN:
1180                 stcb->asoc.prsctp_supported = 0;
1181                 break;
1182         default:
1183                 SCTPDBG(SCTP_DEBUG_INPUT2,
1184                         "Peer does not support chunk type %d (0x%x).\n",
1185                         chunk_type, chunk_type);
1186                 break;
1187         }
1188 }
1189
1190 /*
1191  * Skip past the param header and then we will find the param that caused the
1192  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1193  * these will turn of specific features.
1194  * XXX: Is this the right thing to do?
1195  */
1196 static void
1197 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1198 {
1199         switch (parameter_type) {
1200                 /* pr-sctp draft */
1201         case SCTP_PRSCTP_SUPPORTED:
1202                 stcb->asoc.prsctp_supported = 0;
1203                 break;
1204         case SCTP_SUPPORTED_CHUNK_EXT:
1205                 break;
1206                 /* draft-ietf-tsvwg-addip-sctp */
1207         case SCTP_HAS_NAT_SUPPORT:
1208                 stcb->asoc.peer_supports_nat = 0;
1209                 break;
1210         case SCTP_ADD_IP_ADDRESS:
1211         case SCTP_DEL_IP_ADDRESS:
1212         case SCTP_SET_PRIM_ADDR:
1213                 stcb->asoc.asconf_supported = 0;
1214                 break;
1215         case SCTP_SUCCESS_REPORT:
1216         case SCTP_ERROR_CAUSE_IND:
1217                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1218                 SCTPDBG(SCTP_DEBUG_INPUT2,
1219                         "Turning off ASCONF to this strange peer\n");
1220                 stcb->asoc.asconf_supported = 0;
1221                 break;
1222         default:
1223                 SCTPDBG(SCTP_DEBUG_INPUT2,
1224                         "Peer does not support param type %d (0x%x)??\n",
1225                         parameter_type, parameter_type);
1226                 break;
1227         }
1228 }
1229
1230 static int
1231 sctp_handle_error(struct sctp_chunkhdr *ch,
1232                   struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1233 {
1234         struct sctp_error_cause *cause;
1235         struct sctp_association *asoc;
1236         uint32_t remaining_length, adjust;
1237         uint16_t code, cause_code, cause_length;
1238 #if defined(__APPLE__) && !defined(__Userspace__)
1239         struct socket *so;
1240 #endif
1241
1242         /* parse through all of the errors and process */
1243         asoc = &stcb->asoc;
1244         cause = (struct sctp_error_cause *)((caddr_t)ch +
1245             sizeof(struct sctp_chunkhdr));
1246         remaining_length = ntohs(ch->chunk_length);
1247         if (remaining_length > limit) {
1248                 remaining_length = limit;
1249         }
1250         if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1251                 remaining_length -= sizeof(struct sctp_chunkhdr);
1252         } else {
1253                 remaining_length = 0;
1254         }
1255         code = 0;
1256         while (remaining_length >= sizeof(struct sctp_error_cause)) {
1257                 /* Process an Error Cause */
1258                 cause_code = ntohs(cause->code);
1259                 cause_length = ntohs(cause->length);
1260                 if ((cause_length > remaining_length) || (cause_length == 0)) {
1261                         /* Invalid cause length, possibly due to truncation. */
1262                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1263                                 remaining_length, cause_length);
1264                         return (0);
1265                 }
1266                 if (code == 0) {
1267                         /* report the first error cause */
1268                         code = cause_code;
1269                 }
1270                 switch (cause_code) {
1271                 case SCTP_CAUSE_INVALID_STREAM:
1272                 case SCTP_CAUSE_MISSING_PARAM:
1273                 case SCTP_CAUSE_INVALID_PARAM:
1274                 case SCTP_CAUSE_NO_USER_DATA:
1275                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1276                                 cause_code);
1277                         break;
1278                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1279                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n",
1280                                 ch->chunk_flags);
1281                         if (sctp_handle_nat_colliding_state(stcb)) {
1282                                 return (0);
1283                         }
1284                         break;
1285                 case SCTP_CAUSE_NAT_MISSING_STATE:
1286                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n",
1287                                                    ch->chunk_flags);
1288                         if (sctp_handle_nat_missing_state(stcb, net)) {
1289                                 return (0);
1290                         }
1291                         break;
1292                 case SCTP_CAUSE_STALE_COOKIE:
1293                         /*
1294                          * We only act if we have echoed a cookie and are
1295                          * waiting.
1296                          */
1297                         if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1298                             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1299                                 struct sctp_error_stale_cookie *stale_cookie;
1300
1301                                 stale_cookie = (struct sctp_error_stale_cookie *)cause;
1302                                 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time);
1303                                 /* Double it to be more robust on RTX */
1304                                 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) {
1305                                         asoc->cookie_preserve_req *= 2;
1306                                 } else {
1307                                         asoc->cookie_preserve_req = UINT32_MAX;
1308                                 }
1309                                 asoc->stale_cookie_count++;
1310                                 if (asoc->stale_cookie_count >
1311                                     asoc->max_init_times) {
1312                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1313                                         /* now free the asoc */
1314 #if defined(__APPLE__) && !defined(__Userspace__)
1315                                         so = SCTP_INP_SO(stcb->sctp_ep);
1316                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1317                                         SCTP_TCB_UNLOCK(stcb);
1318                                         SCTP_SOCKET_LOCK(so, 1);
1319                                         SCTP_TCB_LOCK(stcb);
1320                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1321 #endif
1322                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1323                                                               SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1324 #if defined(__APPLE__) && !defined(__Userspace__)
1325                                         SCTP_SOCKET_UNLOCK(so, 1);
1326 #endif
1327                                         return (-1);
1328                                 }
1329                                 /* blast back to INIT state */
1330                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1331                                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1332                                 sctp_stop_all_cookie_timers(stcb);
1333                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1334                         }
1335                         break;
1336                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1337                         /*
1338                          * Nothing we can do here, we don't do hostname
1339                          * addresses so if the peer does not like my IPv6
1340                          * (or IPv4 for that matter) it does not matter. If
1341                          * they don't support that type of address, they can
1342                          * NOT possibly get that packet type... i.e. with no
1343                          * IPv6 you can't receive a IPv6 packet. so we can
1344                          * safely ignore this one. If we ever added support
1345                          * for HOSTNAME Addresses, then we would need to do
1346                          * something here.
1347                          */
1348                         break;
1349                 case SCTP_CAUSE_UNRECOG_CHUNK:
1350                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1351                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
1352
1353                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1354                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
1355                         }
1356                         break;
1357                 case SCTP_CAUSE_UNRECOG_PARAM:
1358                         /* XXX: We only consider the first parameter */
1359                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1360                                 struct sctp_paramhdr *unrec_parameter;
1361
1362                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1363                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1364                         }
1365                         break;
1366                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1367                         /*
1368                          * We ignore this since the timer will drive out a
1369                          * new cookie anyway and there timer will drive us
1370                          * to send a SHUTDOWN_COMPLETE. We can't send one
1371                          * here since we don't have their tag.
1372                          */
1373                         break;
1374                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1375                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1376                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1377                         /*
1378                          * We should NOT get these here, but in a
1379                          * ASCONF-ACK.
1380                          */
1381                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1382                                 cause_code);
1383                         break;
1384                 case SCTP_CAUSE_OUT_OF_RESC:
1385                         /*
1386                          * And what, pray tell do we do with the fact that
1387                          * the peer is out of resources? Not really sure we
1388                          * could do anything but abort. I suspect this
1389                          * should have came WITH an abort instead of in a
1390                          * OP-ERROR.
1391                          */
1392                         break;
1393                 default:
1394                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1395                                 cause_code);
1396                         break;
1397                 }
1398                 adjust = SCTP_SIZE32(cause_length);
1399                 if (remaining_length >= adjust) {
1400                         remaining_length -= adjust;
1401                 } else {
1402                         remaining_length = 0;
1403                 }
1404                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1405         }
1406         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1407         return (0);
1408 }
1409
1410 static int
1411 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1412                      struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1413                      struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1414                      struct sctp_nets *net, int *abort_no_unlock,
1415 #if defined(__FreeBSD__) && !defined(__Userspace__)
1416                      uint8_t mflowtype, uint32_t mflowid,
1417 #endif
1418                      uint32_t vrf_id)
1419 {
1420         struct sctp_init_ack *init_ack;
1421         struct mbuf *op_err;
1422
1423         SCTPDBG(SCTP_DEBUG_INPUT2,
1424                 "sctp_handle_init_ack: handling INIT-ACK\n");
1425
1426         if (stcb == NULL) {
1427                 SCTPDBG(SCTP_DEBUG_INPUT2,
1428                         "sctp_handle_init_ack: TCB is null\n");
1429                 return (-1);
1430         }
1431         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1432                 /* Invalid length */
1433                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1434                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1435                                        src, dst, sh, op_err,
1436 #if defined(__FreeBSD__) && !defined(__Userspace__)
1437                                        mflowtype, mflowid,
1438 #endif
1439                                        vrf_id, net->port);
1440                 *abort_no_unlock = 1;
1441                 return (-1);
1442         }
1443         init_ack = &cp->init;
1444         /* validate parameters */
1445         if (init_ack->initiate_tag == 0) {
1446                 /* protocol error... send an abort */
1447                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1448                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1449                                        src, dst, sh, op_err,
1450 #if defined(__FreeBSD__) && !defined(__Userspace__)
1451                                        mflowtype, mflowid,
1452 #endif
1453                                        vrf_id, net->port);
1454                 *abort_no_unlock = 1;
1455                 return (-1);
1456         }
1457         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1458                 /* protocol error... send an abort */
1459                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1460                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1461                                        src, dst, sh, op_err,
1462 #if defined(__FreeBSD__) && !defined(__Userspace__)
1463                                        mflowtype, mflowid,
1464 #endif
1465                                        vrf_id, net->port);
1466                 *abort_no_unlock = 1;
1467                 return (-1);
1468         }
1469         if (init_ack->num_inbound_streams == 0) {
1470                 /* protocol error... send an abort */
1471                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1472                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1473                                        src, dst, sh, op_err,
1474 #if defined(__FreeBSD__) && !defined(__Userspace__)
1475                                        mflowtype, mflowid,
1476 #endif
1477                                        vrf_id, net->port);
1478                 *abort_no_unlock = 1;
1479                 return (-1);
1480         }
1481         if (init_ack->num_outbound_streams == 0) {
1482                 /* protocol error... send an abort */
1483                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1484                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1485                                        src, dst, sh, op_err,
1486 #if defined(__FreeBSD__) && !defined(__Userspace__)
1487                                        mflowtype, mflowid,
1488 #endif
1489                                        vrf_id, net->port);
1490                 *abort_no_unlock = 1;
1491                 return (-1);
1492         }
1493         /* process according to association state... */
1494         switch (SCTP_GET_STATE(stcb)) {
1495         case SCTP_STATE_COOKIE_WAIT:
1496                 /* this is the expected state for this chunk */
1497                 /* process the INIT-ACK parameters */
1498                 if (stcb->asoc.primary_destination->dest_state &
1499                     SCTP_ADDR_UNCONFIRMED) {
1500                         /*
1501                          * The primary is where we sent the INIT, we can
1502                          * always consider it confirmed when the INIT-ACK is
1503                          * returned. Do this before we load addresses
1504                          * though.
1505                          */
1506                         stcb->asoc.primary_destination->dest_state &=
1507                             ~SCTP_ADDR_UNCONFIRMED;
1508                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1509                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1510                 }
1511                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1512                                           net, abort_no_unlock,
1513 #if defined(__FreeBSD__) && !defined(__Userspace__)
1514                                           mflowtype, mflowid,
1515 #endif
1516                                           vrf_id) < 0) {
1517                         /* error in parsing parameters */
1518                         return (-1);
1519                 }
1520                 /* update our state */
1521                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1522                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1523
1524                 /* reset the RTO calc */
1525                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1526                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1527                                        stcb->asoc.overall_error_count,
1528                                        0,
1529                                        SCTP_FROM_SCTP_INPUT,
1530                                        __LINE__);
1531                 }
1532                 stcb->asoc.overall_error_count = 0;
1533                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1534                 /*
1535                  * collapse the init timer back in case of a exponential
1536                  * backoff
1537                  */
1538                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1539                     stcb, net);
1540                 /*
1541                  * the send at the end of the inbound data processing will
1542                  * cause the cookie to be sent
1543                  */
1544                 break;
1545         case SCTP_STATE_SHUTDOWN_SENT:
1546                 /* incorrect state... discard */
1547                 break;
1548         case SCTP_STATE_COOKIE_ECHOED:
1549                 /* incorrect state... discard */
1550                 break;
1551         case SCTP_STATE_OPEN:
1552                 /* incorrect state... discard */
1553                 break;
1554         case SCTP_STATE_EMPTY:
1555         case SCTP_STATE_INUSE:
1556         default:
1557                 /* incorrect state... discard */
1558                 return (-1);
1559                 break;
1560         }
1561         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1562         return (0);
1563 }
1564
1565 static struct sctp_tcb *
1566 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1567     struct sockaddr *src, struct sockaddr *dst,
1568     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1569     struct sctp_inpcb *inp, struct sctp_nets **netp,
1570     struct sockaddr *init_src, int *notification,
1571     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1572 #if defined(__FreeBSD__) && !defined(__Userspace__)
1573     uint8_t mflowtype, uint32_t mflowid,
1574 #endif
1575     uint32_t vrf_id, uint16_t port);
1576
1577
1578 /*
1579  * handle a state cookie for an existing association m: input packet mbuf
1580  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1581  * "split" mbuf and the cookie signature does not exist offset: offset into
1582  * mbuf to the cookie-echo chunk
1583  */
1584 static struct sctp_tcb *
1585 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1586     struct sockaddr *src, struct sockaddr *dst,
1587     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1588     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1589     struct sockaddr *init_src, int *notification,
1590     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1591 #if defined(__FreeBSD__) && !defined(__Userspace__)
1592     uint8_t mflowtype, uint32_t mflowid,
1593 #endif
1594     uint32_t vrf_id, uint16_t port)
1595 {
1596         struct sctp_association *asoc;
1597         struct sctp_init_chunk *init_cp, init_buf;
1598         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1599         struct sctp_nets *net;
1600         struct mbuf *op_err;
1601         struct timeval old;
1602         int init_offset, initack_offset, i;
1603         int retval;
1604         int spec_flag = 0;
1605         uint32_t how_indx;
1606 #if defined(SCTP_DETAILED_STR_STATS)
1607         int j;
1608 #endif
1609
1610         net = *netp;
1611         /* I know that the TCB is non-NULL from the caller */
1612         asoc = &stcb->asoc;
1613         for (how_indx = 0; how_indx  < sizeof(asoc->cookie_how); how_indx++) {
1614                 if (asoc->cookie_how[how_indx] == 0)
1615                         break;
1616         }
1617         if (how_indx < sizeof(asoc->cookie_how)) {
1618                 asoc->cookie_how[how_indx] = 1;
1619         }
1620         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1621                 /* SHUTDOWN came in after sending INIT-ACK */
1622                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1623                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1624                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1625 #if defined(__FreeBSD__) && !defined(__Userspace__)
1626                                    mflowtype, mflowid, inp->fibnum,
1627 #endif
1628                                    vrf_id, net->port);
1629                 if (how_indx < sizeof(asoc->cookie_how))
1630                         asoc->cookie_how[how_indx] = 2;
1631                 return (NULL);
1632         }
1633         /*
1634          * find and validate the INIT chunk in the cookie (peer's info) the
1635          * INIT should start after the cookie-echo header struct (chunk
1636          * header, state cookie header struct)
1637          */
1638         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1639
1640         init_cp = (struct sctp_init_chunk *)
1641                 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1642                               (uint8_t *) & init_buf);
1643         if (init_cp == NULL) {
1644                 /* could not pull a INIT chunk in cookie */
1645                 return (NULL);
1646         }
1647         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1648                 return (NULL);
1649         }
1650         /*
1651          * find and validate the INIT-ACK chunk in the cookie (my info) the
1652          * INIT-ACK follows the INIT chunk
1653          */
1654         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1655         initack_cp = (struct sctp_init_ack_chunk *)
1656                 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1657                               (uint8_t *) & initack_buf);
1658         if (initack_cp == NULL) {
1659                 /* could not pull INIT-ACK chunk in cookie */
1660                 return (NULL);
1661         }
1662         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1663                 return (NULL);
1664         }
1665         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1666             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1667                 /*
1668                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1669                  * to get into the OPEN state
1670                  */
1671                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1672                         /*-
1673                          * Opps, this means that we somehow generated two vtag's
1674                          * the same. I.e. we did:
1675                          *  Us               Peer
1676                          *   <---INIT(tag=a)------
1677                          *   ----INIT-ACK(tag=t)-->
1678                          *   ----INIT(tag=t)------> *1
1679                          *   <---INIT-ACK(tag=a)---
1680                          *   <----CE(tag=t)------------- *2
1681                          *
1682                          * At point *1 we should be generating a different
1683                          * tag t'. Which means we would throw away the CE and send
1684                          * ours instead. Basically this is case C (throw away side).
1685                          */
1686                         if (how_indx < sizeof(asoc->cookie_how))
1687                                 asoc->cookie_how[how_indx] = 17;
1688                         return (NULL);
1689
1690                 }
1691                 switch (SCTP_GET_STATE(stcb)) {
1692                         case SCTP_STATE_COOKIE_WAIT:
1693                         case SCTP_STATE_COOKIE_ECHOED:
1694                                 /*
1695                                  * INIT was sent but got a COOKIE_ECHO with the
1696                                  * correct tags... just accept it...but we must
1697                                  * process the init so that we can make sure we
1698                                  * have the right seq no's.
1699                                  */
1700                                 /* First we must process the INIT !! */
1701                                 retval = sctp_process_init(init_cp, stcb);
1702                                 if (retval < 0) {
1703                                         if (how_indx < sizeof(asoc->cookie_how))
1704                                                 asoc->cookie_how[how_indx] = 3;
1705                                         return (NULL);
1706                                 }
1707                                 /* we have already processed the INIT so no problem */
1708                                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1709                                                 stcb, net,
1710                                                 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1711                                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1712                                                 stcb, net,
1713                                                 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1714                                 /* update current state */
1715                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1716                                         SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1717                                 else
1718                                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1719
1720                                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1721                                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1722                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1723                                                          stcb->sctp_ep, stcb, NULL);
1724                                 }
1725                                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1726                                 sctp_stop_all_cookie_timers(stcb);
1727                                 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1728                                      (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1729                                     (!SCTP_IS_LISTENING(inp))) {
1730 #if defined(__APPLE__) && !defined(__Userspace__)
1731                                         struct socket *so;
1732 #endif
1733                                         /*
1734                                          * Here is where collision would go if we
1735                                          * did a connect() and instead got a
1736                                          * init/init-ack/cookie done before the
1737                                          * init-ack came back..
1738                                          */
1739                                         stcb->sctp_ep->sctp_flags |=
1740                                                 SCTP_PCB_FLAGS_CONNECTED;
1741 #if defined(__APPLE__) && !defined(__Userspace__)
1742                                         so = SCTP_INP_SO(stcb->sctp_ep);
1743                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1744                                         SCTP_TCB_UNLOCK(stcb);
1745                                         SCTP_SOCKET_LOCK(so, 1);
1746                                         SCTP_TCB_LOCK(stcb);
1747                                         atomic_add_int(&stcb->asoc.refcnt, -1);
1748                                         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1749                                                 SCTP_SOCKET_UNLOCK(so, 1);
1750                                                 return (NULL);
1751                                         }
1752 #endif
1753                                         soisconnected(stcb->sctp_socket);
1754 #if defined(__APPLE__) && !defined(__Userspace__)
1755                                         SCTP_SOCKET_UNLOCK(so, 1);
1756 #endif
1757                                 }
1758                                 /* notify upper layer */
1759                                 *notification = SCTP_NOTIFY_ASSOC_UP;
1760                                 /*
1761                                  * since we did not send a HB make sure we
1762                                  * don't double things
1763                                  */
1764                                 old.tv_sec = cookie->time_entered.tv_sec;
1765                                 old.tv_usec = cookie->time_entered.tv_usec;
1766                                 net->hb_responded = 1;
1767                                 sctp_calculate_rto(stcb, asoc, net, &old,
1768                                                    SCTP_RTT_FROM_NON_DATA);
1769
1770                                 if (stcb->asoc.sctp_autoclose_ticks &&
1771                                     (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1772                                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1773                                                          inp, stcb, NULL);
1774                                 }
1775                                 break;
1776                         default:
1777                                 /*
1778                                  * we're in the OPEN state (or beyond), so
1779                                  * peer must have simply lost the COOKIE-ACK
1780                                  */
1781                                 break;
1782                 }       /* end switch */
1783                 sctp_stop_all_cookie_timers(stcb);
1784                 /*
1785                  * We ignore the return code here.. not sure if we should
1786                  * somehow abort.. but we do have an existing asoc. This
1787                  * really should not fail.
1788                  */
1789                 if (sctp_load_addresses_from_init(stcb, m,
1790                                                   init_offset + sizeof(struct sctp_init_chunk),
1791                                                   initack_offset, src, dst, init_src, stcb->asoc.port)) {
1792                         if (how_indx < sizeof(asoc->cookie_how))
1793                                 asoc->cookie_how[how_indx] = 4;
1794                         return (NULL);
1795                 }
1796                 /* respond with a COOKIE-ACK */
1797                 sctp_toss_old_cookies(stcb, asoc);
1798                 sctp_send_cookie_ack(stcb);
1799                 if (how_indx < sizeof(asoc->cookie_how))
1800                         asoc->cookie_how[how_indx] = 5;
1801                 return (stcb);
1802         }
1803
1804         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1805             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1806             cookie->tie_tag_my_vtag == 0 &&
1807             cookie->tie_tag_peer_vtag == 0) {
1808                 /*
1809                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1810                  */
1811                 if (how_indx < sizeof(asoc->cookie_how))
1812                         asoc->cookie_how[how_indx] = 6;
1813                 return (NULL);
1814         }
1815         /* If nat support, and the below and stcb is established,
1816          * send back a ABORT(colliding state) if we are established.
1817          */
1818         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN)  &&
1819             (asoc->peer_supports_nat) &&
1820             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1821             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1822              (asoc->peer_vtag == 0)))) {
1823                 /* Special case - Peer's support nat. We may have
1824                  * two init's that we gave out the same tag on since
1825                  * one was not established.. i.e. we get INIT from host-1
1826                  * behind the nat and we respond tag-a, we get a INIT from
1827                  * host-2 behind the nat and we get tag-a again. Then we
1828                  * bring up host-1 (or 2's) assoc, Then comes the cookie
1829                  * from hsot-2 (or 1). Now we have colliding state. We must
1830                  * send an abort here with colliding state indication.
1831                  */
1832                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1833                 sctp_send_abort(m, iphlen,  src, dst, sh, 0, op_err,
1834 #if defined(__FreeBSD__) && !defined(__Userspace__)
1835                                 mflowtype, mflowid, inp->fibnum,
1836 #endif
1837                                 vrf_id, port);
1838                 return (NULL);
1839         }
1840         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1841             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1842              (asoc->peer_vtag == 0))) {
1843                 /*
1844                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1845                  * should be ok, re-accept peer info
1846                  */
1847                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1848                         /* Extension of case C.
1849                          * If we hit this, then the random number
1850                          * generator returned the same vtag when we
1851                          * first sent our INIT-ACK and when we later sent
1852                          * our INIT. The side with the seq numbers that are
1853                          * different will be the one that normnally would
1854                          * have hit case C. This in effect "extends" our vtags
1855                          * in this collision case to be 64 bits. The same collision
1856                          * could occur aka you get both vtag and seq number the
1857                          * same twice in a row.. but is much less likely. If it
1858                          * did happen then we would proceed through and bring
1859                          * up the assoc.. we may end up with the wrong stream
1860                          * setup however.. which would be bad.. but there is
1861                          * no way to tell.. until we send on a stream that does
1862                          * not exist :-)
1863                          */
1864                         if (how_indx < sizeof(asoc->cookie_how))
1865                                 asoc->cookie_how[how_indx] = 7;
1866
1867                         return (NULL);
1868                 }
1869                 if (how_indx < sizeof(asoc->cookie_how))
1870                         asoc->cookie_how[how_indx] = 8;
1871                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1872                                 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1873                 sctp_stop_all_cookie_timers(stcb);
1874                 /*
1875                  * since we did not send a HB make sure we don't double
1876                  * things
1877                  */
1878                 net->hb_responded = 1;
1879                 if (stcb->asoc.sctp_autoclose_ticks &&
1880                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1881                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1882                                          NULL);
1883                 }
1884                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1885                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1886
1887                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1888                         /* Ok the peer probably discarded our
1889                          * data (if we echoed a cookie+data). So anything
1890                          * on the sent_queue should be marked for
1891                          * retransmit, we may not get something to
1892                          * kick us so it COULD still take a timeout
1893                          * to move these.. but it can't hurt to mark them.
1894                          */
1895                         struct sctp_tmit_chunk *chk;
1896                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1897                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1898                                         chk->sent = SCTP_DATAGRAM_RESEND;
1899                                         sctp_flight_size_decrease(chk);
1900                                         sctp_total_flight_decrease(stcb, chk);
1901                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1902                                         spec_flag++;
1903                                 }
1904                         }
1905
1906                 }
1907                 /* process the INIT info (peer's info) */
1908                 retval = sctp_process_init(init_cp, stcb);
1909                 if (retval < 0) {
1910                         if (how_indx < sizeof(asoc->cookie_how))
1911                                 asoc->cookie_how[how_indx] = 9;
1912                         return (NULL);
1913                 }
1914                 if (sctp_load_addresses_from_init(stcb, m,
1915                                                   init_offset + sizeof(struct sctp_init_chunk),
1916                                                   initack_offset, src, dst, init_src, stcb->asoc.port)) {
1917                         if (how_indx < sizeof(asoc->cookie_how))
1918                                 asoc->cookie_how[how_indx] = 10;
1919                         return (NULL);
1920                 }
1921                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1922                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1923                         *notification = SCTP_NOTIFY_ASSOC_UP;
1924
1925                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1926                              (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1927                             (!SCTP_IS_LISTENING(inp))) {
1928 #if defined(__APPLE__) && !defined(__Userspace__)
1929                                 struct socket *so;
1930 #endif
1931                                 stcb->sctp_ep->sctp_flags |=
1932                                         SCTP_PCB_FLAGS_CONNECTED;
1933 #if defined(__APPLE__) && !defined(__Userspace__)
1934                                 so = SCTP_INP_SO(stcb->sctp_ep);
1935                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1936                                 SCTP_TCB_UNLOCK(stcb);
1937                                 SCTP_SOCKET_LOCK(so, 1);
1938                                 SCTP_TCB_LOCK(stcb);
1939                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1940                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1941                                         SCTP_SOCKET_UNLOCK(so, 1);
1942                                         return (NULL);
1943                                 }
1944 #endif
1945                                 soisconnected(stcb->sctp_socket);
1946 #if defined(__APPLE__) && !defined(__Userspace__)
1947                                 SCTP_SOCKET_UNLOCK(so, 1);
1948 #endif
1949                         }
1950                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1951                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1952                         else
1953                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1954                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1955                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1956                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1957                 } else {
1958                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1959                 }
1960                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1961                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1962                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1963                                          stcb->sctp_ep, stcb, NULL);
1964                 }
1965                 sctp_stop_all_cookie_timers(stcb);
1966                 sctp_toss_old_cookies(stcb, asoc);
1967                 sctp_send_cookie_ack(stcb);
1968                 if (spec_flag) {
1969                         /* only if we have retrans set do we do this. What
1970                          * this call does is get only the COOKIE-ACK out
1971                          * and then when we return the normal call to
1972                          * sctp_chunk_output will get the retrans out
1973                          * behind this.
1974                          */
1975                         sctp_chunk_output(inp,stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1976                 }
1977                 if (how_indx < sizeof(asoc->cookie_how))
1978                         asoc->cookie_how[how_indx] = 11;
1979
1980                 return (stcb);
1981         }
1982         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1983              ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1984             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1985             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1986             cookie->tie_tag_peer_vtag != 0) {
1987                 struct sctpasochead *head;
1988 #if defined(__APPLE__) && !defined(__Userspace__)
1989                 struct socket *so;
1990 #endif
1991
1992                 if (asoc->peer_supports_nat) {
1993                         /* This is a gross gross hack.
1994                          * Just call the cookie_new code since we
1995                          * are allowing a duplicate association.
1996                          * I hope this works...
1997                          */
1998                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1999                                                         sh, cookie, cookie_len,
2000                                                         inp, netp, init_src,notification,
2001                                                         auth_skipped, auth_offset, auth_len,
2002 #if defined(__FreeBSD__) && !defined(__Userspace__)
2003                                                         mflowtype, mflowid,
2004 #endif
2005                                                         vrf_id, port));
2006                 }
2007                 /*
2008                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
2009                  */
2010                 /* temp code */
2011                 if (how_indx < sizeof(asoc->cookie_how))
2012                         asoc->cookie_how[how_indx] = 12;
2013                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
2014                                 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
2015                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
2016                                 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
2017
2018                 /* notify upper layer */
2019                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
2020                 atomic_add_int(&stcb->asoc.refcnt, 1);
2021                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
2022                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
2023                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
2024                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2025                 }
2026                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
2027                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
2028                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
2029                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
2030                 }
2031                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2032                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2033                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2034                                          stcb->sctp_ep, stcb, NULL);
2035
2036                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
2037                         /* move to OPEN state, if not in SHUTDOWN_SENT */
2038                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2039                 }
2040                 asoc->pre_open_streams =
2041                         ntohs(initack_cp->init.num_outbound_streams);
2042                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2043                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2044                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2045
2046                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2047
2048                 asoc->str_reset_seq_in = asoc->init_seq_number;
2049
2050                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2051                 if (asoc->mapping_array) {
2052                         memset(asoc->mapping_array, 0,
2053                                asoc->mapping_array_size);
2054                 }
2055                 if (asoc->nr_mapping_array) {
2056                         memset(asoc->nr_mapping_array, 0,
2057                             asoc->mapping_array_size);
2058                 }
2059                 SCTP_TCB_UNLOCK(stcb);
2060 #if defined(__APPLE__) && !defined(__Userspace__)
2061                 so = SCTP_INP_SO(stcb->sctp_ep);
2062                 SCTP_SOCKET_LOCK(so, 1);
2063 #endif
2064                 SCTP_INP_INFO_WLOCK();
2065                 SCTP_INP_WLOCK(stcb->sctp_ep);
2066                 SCTP_TCB_LOCK(stcb);
2067                 atomic_add_int(&stcb->asoc.refcnt, -1);
2068                 /* send up all the data */
2069                 SCTP_TCB_SEND_LOCK(stcb);
2070
2071                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
2072                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
2073                         stcb->asoc.strmout[i].chunks_on_queues = 0;
2074 #if defined(SCTP_DETAILED_STR_STATS)
2075                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
2076                                 asoc->strmout[i].abandoned_sent[j] = 0;
2077                                 asoc->strmout[i].abandoned_unsent[j] = 0;
2078                         }
2079 #else
2080                         asoc->strmout[i].abandoned_sent[0] = 0;
2081                         asoc->strmout[i].abandoned_unsent[0] = 0;
2082 #endif
2083                         stcb->asoc.strmout[i].sid = i;
2084                         stcb->asoc.strmout[i].next_mid_ordered = 0;
2085                         stcb->asoc.strmout[i].next_mid_unordered = 0;
2086                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
2087                 }
2088                 /* process the INIT-ACK info (my info) */
2089                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2090                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2091
2092                 /* pull from vtag hash */
2093                 LIST_REMOVE(stcb, sctp_asocs);
2094                 /* re-insert to new vtag position */
2095                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
2096                                                                     SCTP_BASE_INFO(hashasocmark))];
2097                 /*
2098                  * put it in the bucket in the vtag hash of assoc's for the
2099                  * system
2100                  */
2101                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
2102
2103                 SCTP_TCB_SEND_UNLOCK(stcb);
2104                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
2105                 SCTP_INP_INFO_WUNLOCK();
2106 #if defined(__APPLE__) && !defined(__Userspace__)
2107                 SCTP_SOCKET_UNLOCK(so, 1);
2108 #endif
2109                 asoc->total_flight = 0;
2110                 asoc->total_flight_count = 0;
2111                 /* process the INIT info (peer's info) */
2112                 retval = sctp_process_init(init_cp, stcb);
2113                 if (retval < 0) {
2114                         if (how_indx < sizeof(asoc->cookie_how))
2115                                 asoc->cookie_how[how_indx] = 13;
2116
2117                         return (NULL);
2118                 }
2119                 /*
2120                  * since we did not send a HB make sure we don't double
2121                  * things
2122                  */
2123                 net->hb_responded = 1;
2124
2125                 if (sctp_load_addresses_from_init(stcb, m,
2126                                                   init_offset + sizeof(struct sctp_init_chunk),
2127                                                   initack_offset, src, dst, init_src, stcb->asoc.port)) {
2128                         if (how_indx < sizeof(asoc->cookie_how))
2129                                 asoc->cookie_how[how_indx] = 14;
2130
2131                         return (NULL);
2132                 }
2133                 /* respond with a COOKIE-ACK */
2134                 sctp_stop_all_cookie_timers(stcb);
2135                 sctp_toss_old_cookies(stcb, asoc);
2136                 sctp_send_cookie_ack(stcb);
2137                 if (how_indx < sizeof(asoc->cookie_how))
2138                         asoc->cookie_how[how_indx] = 15;
2139
2140                 return (stcb);
2141         }
2142         if (how_indx < sizeof(asoc->cookie_how))
2143                 asoc->cookie_how[how_indx] = 16;
2144         /* all other cases... */
2145         return (NULL);
2146 }
2147
2148
2149 /*
2150  * handle a state cookie for a new association m: input packet mbuf chain--
2151  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2152  * and the cookie signature does not exist offset: offset into mbuf to the
2153  * cookie-echo chunk length: length of the cookie chunk to: where the init
2154  * was from returns a new TCB
2155  */
2156 static struct sctp_tcb *
2157 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2158     struct sockaddr *src, struct sockaddr *dst,
2159     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2160     struct sctp_inpcb *inp, struct sctp_nets **netp,
2161     struct sockaddr *init_src, int *notification,
2162     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2163 #if defined(__FreeBSD__) && !defined(__Userspace__)
2164     uint8_t mflowtype, uint32_t mflowid,
2165 #endif
2166     uint32_t vrf_id, uint16_t port)
2167 {
2168         struct sctp_tcb *stcb;
2169         struct sctp_init_chunk *init_cp, init_buf;
2170         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2171         union sctp_sockstore store;
2172         struct sctp_association *asoc;
2173         int init_offset, initack_offset, initack_limit;
2174         int retval;
2175         int error = 0;
2176         uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
2177 #if defined(__APPLE__) && !defined(__Userspace__)
2178         struct socket *so;
2179
2180         so = SCTP_INP_SO(inp);
2181 #endif
2182
2183         /*
2184          * find and validate the INIT chunk in the cookie (peer's info) the
2185          * INIT should start after the cookie-echo header struct (chunk
2186          * header, state cookie header struct)
2187          */
2188         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2189         init_cp = (struct sctp_init_chunk *)
2190             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2191             (uint8_t *) & init_buf);
2192         if (init_cp == NULL) {
2193                 /* could not pull a INIT chunk in cookie */
2194                 SCTPDBG(SCTP_DEBUG_INPUT1,
2195                         "process_cookie_new: could not pull INIT chunk hdr\n");
2196                 return (NULL);
2197         }
2198         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2199                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2200                 return (NULL);
2201         }
2202         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2203         /*
2204          * find and validate the INIT-ACK chunk in the cookie (my info) the
2205          * INIT-ACK follows the INIT chunk
2206          */
2207         initack_cp = (struct sctp_init_ack_chunk *)
2208             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2209             (uint8_t *) & initack_buf);
2210         if (initack_cp == NULL) {
2211                 /* could not pull INIT-ACK chunk in cookie */
2212                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2213                 return (NULL);
2214         }
2215         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2216                 return (NULL);
2217         }
2218         /*
2219          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2220          * "initack_limit" value.  This is because the chk_length field
2221          * includes the length of the cookie, but the cookie is omitted when
2222          * the INIT and INIT_ACK are tacked onto the cookie...
2223          */
2224         initack_limit = offset + cookie_len;
2225
2226         /*
2227          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2228          * and popluate
2229          */
2230
2231         /*
2232          * Here we do a trick, we set in NULL for the proc/thread argument. We
2233          * do this since in effect we only use the p argument when
2234          * the socket is unbound and we must do an implicit bind.
2235          * Since we are getting a cookie, we cannot be unbound.
2236          */
2237         stcb = sctp_aloc_assoc(inp, init_src, &error,
2238                                ntohl(initack_cp->init.initiate_tag), vrf_id,
2239                                ntohs(initack_cp->init.num_outbound_streams),
2240                                port,
2241 #if defined(__FreeBSD__) && !defined(__Userspace__)
2242                                (struct thread *)NULL,
2243 #elif defined(_WIN32) && !defined(__Userspace__)
2244                                (PKTHREAD)NULL,
2245 #else
2246                                (struct proc *)NULL,
2247 #endif
2248                                SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2249         if (stcb == NULL) {
2250                 struct mbuf *op_err;
2251
2252                 /* memory problem? */
2253                 SCTPDBG(SCTP_DEBUG_INPUT1,
2254                         "process_cookie_new: no room for another TCB!\n");
2255                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2256                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2257                                        src, dst, sh, op_err,
2258 #if defined(__FreeBSD__) && !defined(__Userspace__)
2259                                        mflowtype, mflowid,
2260 #endif
2261                                        vrf_id, port);
2262                 return (NULL);
2263         }
2264         /* get the correct sctp_nets */
2265         if (netp)
2266                 *netp = sctp_findnet(stcb, init_src);
2267
2268         asoc = &stcb->asoc;
2269         /* get scope variables out of cookie */
2270         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2271         asoc->scope.site_scope = cookie->site_scope;
2272         asoc->scope.local_scope = cookie->local_scope;
2273         asoc->scope.loopback_scope = cookie->loopback_scope;
2274
2275 #if defined(__Userspace__)
2276         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2277             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal) ||
2278             (asoc->scope.conn_addr_legal != cookie->conn_addr_legal)) {
2279 #else
2280         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2281             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2282 #endif
2283                 struct mbuf *op_err;
2284
2285                 /*
2286                  * Houston we have a problem. The EP changed while the
2287                  * cookie was in flight. Only recourse is to abort the
2288                  * association.
2289                  */
2290                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2291                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2292                                        src, dst, sh, op_err,
2293 #if defined(__FreeBSD__) && !defined(__Userspace__)
2294                                        mflowtype, mflowid,
2295 #endif
2296                                        vrf_id, port);
2297 #if defined(__APPLE__) && !defined(__Userspace__)
2298                 atomic_add_int(&stcb->asoc.refcnt, 1);
2299                 SCTP_TCB_UNLOCK(stcb);
2300                 SCTP_SOCKET_LOCK(so, 1);
2301                 SCTP_TCB_LOCK(stcb);
2302                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2303 #endif
2304                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2305                                       SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2306 #if defined(__APPLE__) && !defined(__Userspace__)
2307                 SCTP_SOCKET_UNLOCK(so, 1);
2308 #endif
2309                 return (NULL);
2310         }
2311         /* process the INIT-ACK info (my info) */
2312         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2313         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2314         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2315         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2316         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2317         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2318         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2319         asoc->str_reset_seq_in = asoc->init_seq_number;
2320
2321         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2322
2323         /* process the INIT info (peer's info) */
2324         if (netp)
2325                 retval = sctp_process_init(init_cp, stcb);
2326         else
2327                 retval = 0;
2328         if (retval < 0) {
2329 #if defined(__APPLE__) && !defined(__Userspace__)
2330                 atomic_add_int(&stcb->asoc.refcnt, 1);
2331                 SCTP_TCB_UNLOCK(stcb);
2332                 SCTP_SOCKET_LOCK(so, 1);
2333                 SCTP_TCB_LOCK(stcb);
2334                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2335 #endif
2336                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2337                                       SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2338 #if defined(__APPLE__) && !defined(__Userspace__)
2339                 SCTP_SOCKET_UNLOCK(so, 1);
2340 #endif
2341                 return (NULL);
2342         }
2343         /* load all addresses */
2344         if (sctp_load_addresses_from_init(stcb, m,
2345             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2346             src, dst, init_src, port)) {
2347 #if defined(__APPLE__) && !defined(__Userspace__)
2348                 atomic_add_int(&stcb->asoc.refcnt, 1);
2349                 SCTP_TCB_UNLOCK(stcb);
2350                 SCTP_SOCKET_LOCK(so, 1);
2351                 SCTP_TCB_LOCK(stcb);
2352                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2353 #endif
2354                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2355                                       SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2356 #if defined(__APPLE__) && !defined(__Userspace__)
2357                 SCTP_SOCKET_UNLOCK(so, 1);
2358 #endif
2359                 return (NULL);
2360         }
2361         /*
2362          * verify any preceding AUTH chunk that was skipped
2363          */
2364         /* pull the local authentication parameters from the cookie/init-ack */
2365         sctp_auth_get_cookie_params(stcb, m,
2366             initack_offset + sizeof(struct sctp_init_ack_chunk),
2367             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2368         if (auth_skipped) {
2369                 struct sctp_auth_chunk *auth;
2370
2371                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
2372                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2373                 } else {
2374                         auth = NULL;
2375                 }
2376                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2377                         /* auth HMAC failed, dump the assoc and packet */
2378                         SCTPDBG(SCTP_DEBUG_AUTH1,
2379                                 "COOKIE-ECHO: AUTH failed\n");
2380 #if defined(__APPLE__) && !defined(__Userspace__)
2381                         atomic_add_int(&stcb->asoc.refcnt, 1);
2382                         SCTP_TCB_UNLOCK(stcb);
2383                         SCTP_SOCKET_LOCK(so, 1);
2384                         SCTP_TCB_LOCK(stcb);
2385                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2386 #endif
2387                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2388                                               SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2389 #if defined(__APPLE__) && !defined(__Userspace__)
2390                         SCTP_SOCKET_UNLOCK(so, 1);
2391 #endif
2392                         return (NULL);
2393                 } else {
2394                         /* remaining chunks checked... good to go */
2395                         stcb->asoc.authenticated = 1;
2396                 }
2397         }
2398
2399         /*
2400          * if we're doing ASCONFs, check to see if we have any new local
2401          * addresses that need to get added to the peer (eg. addresses
2402          * changed while cookie echo in flight).  This needs to be done
2403          * after we go to the OPEN state to do the correct asconf
2404          * processing. else, make sure we have the correct addresses in our
2405          * lists
2406          */
2407
2408         /* warning, we re-use sin, sin6, sa_store here! */
2409         /* pull in local_address (our "from" address) */
2410         switch (cookie->laddr_type) {
2411 #ifdef INET
2412         case SCTP_IPV4_ADDRESS:
2413                 /* source addr is IPv4 */
2414                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2415                 store.sin.sin_family = AF_INET;
2416 #ifdef HAVE_SIN_LEN
2417                 store.sin.sin_len = sizeof(struct sockaddr_in);
2418 #endif
2419                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2420                 break;
2421 #endif
2422 #ifdef INET6
2423         case SCTP_IPV6_ADDRESS:
2424                 /* source addr is IPv6 */
2425                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2426                 store.sin6.sin6_family = AF_INET6;
2427 #ifdef HAVE_SIN6_LEN
2428                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2429 #endif
2430                 store.sin6.sin6_scope_id = cookie->scope_id;
2431                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2432                 break;
2433 #endif
2434 #if defined(__Userspace__)
2435         case SCTP_CONN_ADDRESS:
2436                 /* source addr is conn */
2437                 memset(&store.sconn, 0, sizeof(struct sockaddr_conn));
2438                 store.sconn.sconn_family = AF_CONN;
2439 #ifdef HAVE_SCONN_LEN
2440                 store.sconn.sconn_len = sizeof(struct sockaddr_conn);
2441 #endif
2442                 memcpy(&store.sconn.sconn_addr, cookie->laddress, sizeof(void *));
2443                 break;
2444 #endif
2445         default:
2446 #if defined(__APPLE__) && !defined(__Userspace__)
2447                 atomic_add_int(&stcb->asoc.refcnt, 1);
2448                 SCTP_TCB_UNLOCK(stcb);
2449                 SCTP_SOCKET_LOCK(so, 1);
2450                 SCTP_TCB_LOCK(stcb);
2451                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2452 #endif
2453                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2454                                       SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2455 #if defined(__APPLE__) && !defined(__Userspace__)
2456                 SCTP_SOCKET_UNLOCK(so, 1);
2457 #endif
2458                 return (NULL);
2459         }
2460
2461         /* update current state */
2462         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2463         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2464         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2465                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2466                                  stcb->sctp_ep, stcb, NULL);
2467         }
2468         sctp_stop_all_cookie_timers(stcb);
2469         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2470         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2471
2472         /* set up to notify upper layer */
2473         *notification = SCTP_NOTIFY_ASSOC_UP;
2474         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2475             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2476             (!SCTP_IS_LISTENING(inp))) {
2477                 /*
2478                  * This is an endpoint that called connect() how it got a
2479                  * cookie that is NEW is a bit of a mystery. It must be that
2480                  * the INIT was sent, but before it got there.. a complete
2481                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2482                  * should have went to the other code.. not here.. oh well..
2483                  * a bit of protection is worth having..
2484                  */
2485                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2486 #if defined(__APPLE__) && !defined(__Userspace__)
2487                 atomic_add_int(&stcb->asoc.refcnt, 1);
2488                 SCTP_TCB_UNLOCK(stcb);
2489                 SCTP_SOCKET_LOCK(so, 1);
2490                 SCTP_TCB_LOCK(stcb);
2491                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2492                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2493                         SCTP_SOCKET_UNLOCK(so, 1);
2494                         return (NULL);
2495                 }
2496 #endif
2497                 soisconnected(stcb->sctp_socket);
2498 #if defined(__APPLE__) && !defined(__Userspace__)
2499                 SCTP_SOCKET_UNLOCK(so, 1);
2500 #endif
2501         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2502                    (SCTP_IS_LISTENING(inp))) {
2503                 /*
2504                  * We don't want to do anything with this one. Since it is
2505                  * the listening guy. The timer will get started for
2506                  * accepted connections in the caller.
2507                  */
2508                 ;
2509         }
2510         /* since we did not send a HB make sure we don't double things */
2511         if ((netp) && (*netp))
2512                 (*netp)->hb_responded = 1;
2513
2514         if (stcb->asoc.sctp_autoclose_ticks &&
2515             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2516                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2517         }
2518         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2519         if ((netp != NULL) && (*netp != NULL)) {
2520                 struct timeval old;
2521
2522                 /* calculate the RTT and set the encaps port */
2523                 old.tv_sec = cookie->time_entered.tv_sec;
2524                 old.tv_usec = cookie->time_entered.tv_usec;
2525                 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
2526         }
2527         /* respond with a COOKIE-ACK */
2528         sctp_send_cookie_ack(stcb);
2529
2530         /*
2531          * check the address lists for any ASCONFs that need to be sent
2532          * AFTER the cookie-ack is sent
2533          */
2534         sctp_check_address_list(stcb, m,
2535             initack_offset + sizeof(struct sctp_init_ack_chunk),
2536             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2537             &store.sa, cookie->local_scope, cookie->site_scope,
2538             cookie->ipv4_scope, cookie->loopback_scope);
2539
2540
2541         return (stcb);
2542 }
2543
2544 /*
2545  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2546  * we NEED to make sure we are not already using the vtag. If so we
2547  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2548         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2549                                                             SCTP_BASE_INFO(hashasocmark))];
2550         LIST_FOREACH(stcb, head, sctp_asocs) {
2551                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2552                        -- SEND ABORT - TRY AGAIN --
2553                 }
2554         }
2555 */
2556
2557 /*
2558  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2559  * existing (non-NULL) TCB
2560  */
2561 static struct mbuf *
2562 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2563     struct sockaddr *src, struct sockaddr *dst,
2564     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2565     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2566     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2567     struct sctp_tcb **locked_tcb,
2568 #if defined(__FreeBSD__) && !defined(__Userspace__)
2569     uint8_t mflowtype, uint32_t mflowid,
2570 #endif
2571     uint32_t vrf_id, uint16_t port)
2572 {
2573         struct sctp_state_cookie *cookie;
2574         struct sctp_tcb *l_stcb = *stcb;
2575         struct sctp_inpcb *l_inp;
2576         struct sockaddr *to;
2577         struct sctp_pcb *ep;
2578         struct mbuf *m_sig;
2579         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2580         uint8_t *sig;
2581         uint8_t cookie_ok = 0;
2582         unsigned int sig_offset, cookie_offset;
2583         unsigned int cookie_len;
2584         struct timeval now;
2585         struct timeval time_expires;
2586         int notification = 0;
2587         struct sctp_nets *netl;
2588         int had_a_existing_tcb = 0;
2589         int send_int_conf = 0;
2590 #ifdef INET
2591         struct sockaddr_in sin;
2592 #endif
2593 #ifdef INET6
2594         struct sockaddr_in6 sin6;
2595 #endif
2596 #if defined(__Userspace__)
2597         struct sockaddr_conn sconn;
2598 #endif
2599
2600         SCTPDBG(SCTP_DEBUG_INPUT2,
2601                 "sctp_handle_cookie: handling COOKIE-ECHO\n");
2602
2603         if (inp_p == NULL) {
2604                 return (NULL);
2605         }
2606         cookie = &cp->cookie;
2607         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2608         cookie_len = ntohs(cp->ch.chunk_length);
2609
2610         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2611             sizeof(struct sctp_init_chunk) +
2612             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2613                 /* cookie too small */
2614                 return (NULL);
2615         }
2616         if ((cookie->peerport != sh->src_port) ||
2617             (cookie->myport != sh->dest_port) ||
2618             (cookie->my_vtag != sh->v_tag)) {
2619                 /*
2620                  * invalid ports or bad tag.  Note that we always leave the
2621                  * v_tag in the header in network order and when we stored
2622                  * it in the my_vtag slot we also left it in network order.
2623                  * This maintains the match even though it may be in the
2624                  * opposite byte order of the machine :->
2625                  */
2626                 return (NULL);
2627         }
2628 #if defined(__Userspace__)
2629         /*
2630          * Recover the AF_CONN addresses within the cookie.
2631          * This needs to be done in the buffer provided for later processing
2632          * of the cookie and in the mbuf chain for HMAC validation.
2633          */
2634         if ((cookie->addr_type == SCTP_CONN_ADDRESS) && (src->sa_family == AF_CONN)) {
2635                 struct sockaddr_conn *sconnp = (struct sockaddr_conn *)src;
2636
2637                 memcpy(cookie->address, &sconnp->sconn_addr , sizeof(void *));
2638                 m_copyback(m, cookie_offset + offsetof(struct sctp_state_cookie, address),
2639                            (int)sizeof(void *), (caddr_t)&sconnp->sconn_addr);
2640         }
2641         if ((cookie->laddr_type == SCTP_CONN_ADDRESS) && (dst->sa_family == AF_CONN)) {
2642                 struct sockaddr_conn *sconnp = (struct sockaddr_conn *)dst;
2643
2644                 memcpy(cookie->laddress, &sconnp->sconn_addr , sizeof(void *));
2645                 m_copyback(m, cookie_offset + offsetof(struct sctp_state_cookie, laddress),
2646                            (int)sizeof(void *), (caddr_t)&sconnp->sconn_addr);
2647         }
2648 #endif
2649         /*
2650          * split off the signature into its own mbuf (since it should not be
2651          * calculated in the sctp_hmac_m() call).
2652          */
2653         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2654         m_sig = m_split(m, sig_offset, M_NOWAIT);
2655         if (m_sig == NULL) {
2656                 /* out of memory or ?? */
2657                 return (NULL);
2658         }
2659 #ifdef SCTP_MBUF_LOGGING
2660         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2661                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2662         }
2663 #endif
2664
2665         /*
2666          * compute the signature/digest for the cookie
2667          */
2668         ep = &(*inp_p)->sctp_ep;
2669         l_inp = *inp_p;
2670         if (l_stcb) {
2671                 SCTP_TCB_UNLOCK(l_stcb);
2672         }
2673         SCTP_INP_RLOCK(l_inp);
2674         if (l_stcb) {
2675                 SCTP_TCB_LOCK(l_stcb);
2676         }
2677         /* which cookie is it? */
2678         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2679             (ep->current_secret_number != ep->last_secret_number)) {
2680                 /* it's the old cookie */
2681                 (void)sctp_hmac_m(SCTP_HMAC,
2682                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2683                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2684         } else {
2685                 /* it's the current cookie */
2686                 (void)sctp_hmac_m(SCTP_HMAC,
2687                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2688                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2689         }
2690         /* get the signature */
2691         SCTP_INP_RUNLOCK(l_inp);
2692         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2693         if (sig == NULL) {
2694                 /* couldn't find signature */
2695                 sctp_m_freem(m_sig);
2696                 return (NULL);
2697         }
2698         /* compare the received digest with the computed digest */
2699         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2700                 /* try the old cookie? */
2701                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2702                     (ep->current_secret_number != ep->last_secret_number)) {
2703                         /* compute digest with old */
2704                         (void)sctp_hmac_m(SCTP_HMAC,
2705                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2706                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2707                         /* compare */
2708                         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2709                                 cookie_ok = 1;
2710                 }
2711         } else {
2712                 cookie_ok = 1;
2713         }
2714
2715         /*
2716          * Now before we continue we must reconstruct our mbuf so that
2717          * normal processing of any other chunks will work.
2718          */
2719         {
2720                 struct mbuf *m_at;
2721
2722                 m_at = m;
2723                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2724                         m_at = SCTP_BUF_NEXT(m_at);
2725                 }
2726                 SCTP_BUF_NEXT(m_at) = m_sig;
2727         }
2728
2729         if (cookie_ok == 0) {
2730                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2731                 SCTPDBG(SCTP_DEBUG_INPUT2,
2732                         "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2733                         (uint32_t) offset, cookie_offset, sig_offset);
2734                 return (NULL);
2735         }
2736
2737         /*
2738          * check the cookie timestamps to be sure it's not stale
2739          */
2740         (void)SCTP_GETTIME_TIMEVAL(&now);
2741         /* Expire time is in Ticks, so we convert to seconds */
2742         time_expires.tv_sec = cookie->time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
2743         time_expires.tv_usec = cookie->time_entered.tv_usec;
2744 #if !(defined(__FreeBSD__) && !defined(__Userspace__))
2745         if (timercmp(&now, &time_expires, >))
2746 #else
2747         if (timevalcmp(&now, &time_expires, >))
2748 #endif
2749         {
2750                 /* cookie is stale! */
2751                 struct mbuf *op_err;
2752                 struct sctp_error_stale_cookie *cause;
2753                 struct timeval diff;
2754                 uint32_t staleness;
2755
2756                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2757                                                0, M_NOWAIT, 1, MT_DATA);
2758                 if (op_err == NULL) {
2759                         /* FOOBAR */
2760                         return (NULL);
2761                 }
2762                 /* Set the len */
2763                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2764                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2765                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2766                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2767                     (sizeof(uint32_t))));
2768 #if !(defined(__FreeBSD__) && !defined(__Userspace__))
2769                 timersub(&now, &time_expires, &diff);
2770 #else
2771                 diff = now;
2772                 timevalsub(&diff, &time_expires);
2773 #endif
2774                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2775                         staleness = UINT32_MAX;
2776                 } else {
2777                         staleness = diff.tv_sec * 1000000;
2778                 }
2779                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2780                         staleness += diff.tv_usec;
2781                 } else {
2782                         staleness = UINT32_MAX;
2783                 }
2784                 cause->stale_time = htonl(staleness);
2785                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2786 #if defined(__FreeBSD__) && !defined(__Userspace__)
2787                                    mflowtype, mflowid, l_inp->fibnum,
2788 #endif
2789                                    vrf_id, port);
2790                 return (NULL);
2791         }
2792         /*
2793          * Now we must see with the lookup address if we have an existing
2794          * asoc. This will only happen if we were in the COOKIE-WAIT state
2795          * and a INIT collided with us and somewhere the peer sent the
2796          * cookie on another address besides the single address our assoc
2797          * had for him. In this case we will have one of the tie-tags set at
2798          * least AND the address field in the cookie can be used to look it
2799          * up.
2800          */
2801         to = NULL;
2802         switch (cookie->addr_type) {
2803 #ifdef INET6
2804         case SCTP_IPV6_ADDRESS:
2805                 memset(&sin6, 0, sizeof(sin6));
2806                 sin6.sin6_family = AF_INET6;
2807 #ifdef HAVE_SIN6_LEN
2808                 sin6.sin6_len = sizeof(sin6);
2809 #endif
2810                 sin6.sin6_port = sh->src_port;
2811                 sin6.sin6_scope_id = cookie->scope_id;
2812                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2813                     sizeof(sin6.sin6_addr.s6_addr));
2814                 to = (struct sockaddr *)&sin6;
2815                 break;
2816 #endif
2817 #ifdef INET
2818         case SCTP_IPV4_ADDRESS:
2819                 memset(&sin, 0, sizeof(sin));
2820                 sin.sin_family = AF_INET;
2821 #ifdef HAVE_SIN_LEN
2822                 sin.sin_len = sizeof(sin);
2823 #endif
2824                 sin.sin_port = sh->src_port;
2825                 sin.sin_addr.s_addr = cookie->address[0];
2826                 to = (struct sockaddr *)&sin;
2827                 break;
2828 #endif
2829 #if defined(__Userspace__)
2830         case SCTP_CONN_ADDRESS:
2831                 memset(&sconn, 0, sizeof(struct sockaddr_conn));
2832                 sconn.sconn_family = AF_CONN;
2833 #ifdef HAVE_SCONN_LEN
2834                 sconn.sconn_len = sizeof(struct sockaddr_conn);
2835 #endif
2836                 sconn.sconn_port = sh->src_port;
2837                 memcpy(&sconn.sconn_addr, cookie->address, sizeof(void *));
2838                 to = (struct sockaddr *)&sconn;
2839                 break;
2840 #endif
2841         default:
2842                 /* This should not happen */
2843                 return (NULL);
2844         }
2845         if (*stcb == NULL) {
2846                 /* Yep, lets check */
2847                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2848                 if (*stcb == NULL) {
2849                         /*
2850                          * We should have only got back the same inp. If we
2851                          * got back a different ep we have a problem. The
2852                          * original findep got back l_inp and now
2853                          */
2854                         if (l_inp != *inp_p) {
2855                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2856                         }
2857                 } else {
2858                         if (*locked_tcb == NULL) {
2859                                 /* In this case we found the assoc only
2860                                  * after we locked the create lock. This means
2861                                  * we are in a colliding case and we must make
2862                                  * sure that we unlock the tcb if its one of the
2863                                  * cases where we throw away the incoming packets.
2864                                  */
2865                                 *locked_tcb = *stcb;
2866
2867                                 /* We must also increment the inp ref count
2868                                  * since the ref_count flags was set when we
2869                                  * did not find the TCB, now we found it which
2870                                  * reduces the refcount.. we must raise it back
2871                                  * out to balance it all :-)
2872                                  */
2873                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2874                                 if ((*stcb)->sctp_ep != l_inp) {
2875                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2876                                                     (void *)(*stcb)->sctp_ep, (void *)l_inp);
2877                                 }
2878                         }
2879                 }
2880         }
2881
2882         cookie_len -= SCTP_SIGNATURE_SIZE;
2883         if (*stcb == NULL) {
2884                 /* this is the "normal" case... get a new TCB */
2885                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2886                                                 cookie, cookie_len, *inp_p,
2887                                                 netp, to, &notification,
2888                                                 auth_skipped, auth_offset, auth_len,
2889 #if defined(__FreeBSD__) && !defined(__Userspace__)
2890                                                 mflowtype, mflowid,
2891 #endif
2892                                                 vrf_id, port);
2893         } else {
2894                 /* this is abnormal... cookie-echo on existing TCB */
2895                 had_a_existing_tcb = 1;
2896                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2897                                                      src, dst, sh,
2898                                                      cookie, cookie_len, *inp_p, *stcb, netp, to,
2899                                                      &notification, auth_skipped, auth_offset, auth_len,
2900 #if defined(__FreeBSD__) && !defined(__Userspace__)
2901                                                      mflowtype, mflowid,
2902 #endif
2903                                                      vrf_id, port);
2904         }
2905
2906         if (*stcb == NULL) {
2907                 /* still no TCB... must be bad cookie-echo */
2908                 return (NULL);
2909         }
2910 #if defined(__FreeBSD__) && !defined(__Userspace__)
2911         if (*netp != NULL) {
2912                 (*netp)->flowtype = mflowtype;
2913                 (*netp)->flowid = mflowid;
2914         }
2915 #endif
2916         /*
2917          * Ok, we built an association so confirm the address we sent the
2918          * INIT-ACK to.
2919          */
2920         netl = sctp_findnet(*stcb, to);
2921         /*
2922          * This code should in theory NOT run but
2923          */
2924         if (netl == NULL) {
2925                 /* TSNH! Huh, why do I need to add this address here? */
2926                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2927                                          SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2928                         return (NULL);
2929                 }
2930                 netl = sctp_findnet(*stcb, to);
2931         }
2932         if (netl) {
2933                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2934                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2935                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2936                             netl);
2937                         send_int_conf = 1;
2938                 }
2939         }
2940         sctp_start_net_timers(*stcb);
2941         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2942                 if (!had_a_existing_tcb ||
2943                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2944                         /*
2945                          * If we have a NEW cookie or the connect never
2946                          * reached the connected state during collision we
2947                          * must do the TCP accept thing.
2948                          */
2949                         struct socket *so, *oso;
2950                         struct sctp_inpcb *inp;
2951
2952                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2953                                 /*
2954                                  * For a restart we will keep the same
2955                                  * socket, no need to do anything. I THINK!!
2956                                  */
2957                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2958                                 if (send_int_conf) {
2959                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2960                                                         (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2961                                 }
2962                                 return (m);
2963                         }
2964                         oso = (*inp_p)->sctp_socket;
2965                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2966                         SCTP_TCB_UNLOCK((*stcb));
2967 #if defined(__FreeBSD__) && !defined(__Userspace__)
2968                         CURVNET_SET(oso->so_vnet);
2969 #endif
2970 #if defined(__APPLE__) && !defined(__Userspace__)
2971                         SCTP_SOCKET_LOCK(oso, 1);
2972 #endif
2973                         so = sonewconn(oso, 0
2974 #if defined(__APPLE__) && !defined(__Userspace__)
2975                             ,NULL
2976 #endif
2977                             );
2978 #if defined(__APPLE__) && !defined(__Userspace__)
2979                         SCTP_SOCKET_UNLOCK(oso, 1);
2980 #endif
2981 #if defined(__FreeBSD__) && !defined(__Userspace__)
2982                         CURVNET_RESTORE();
2983 #endif
2984                         SCTP_TCB_LOCK((*stcb));
2985                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2986
2987                         if (so == NULL) {
2988                                 struct mbuf *op_err;
2989 #if defined(__APPLE__) && !defined(__Userspace__)
2990                                 struct socket *pcb_so;
2991 #endif
2992                                 /* Too many sockets */
2993                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2994                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2995                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2996                                                        src, dst, sh, op_err,
2997 #if defined(__FreeBSD__) && !defined(__Userspace__)
2998                                                        mflowtype, mflowid,
2999 #endif
3000                                                        vrf_id, port);
3001 #if defined(__APPLE__) && !defined(__Userspace__)
3002                                 pcb_so = SCTP_INP_SO(*inp_p);
3003                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
3004                                 SCTP_TCB_UNLOCK((*stcb));
3005                                 SCTP_SOCKET_LOCK(pcb_so, 1);
3006                                 SCTP_TCB_LOCK((*stcb));
3007                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
3008 #endif
3009                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
3010                                                       SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
3011 #if defined(__APPLE__) && !defined(__Userspace__)
3012                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
3013 #endif
3014                                 return (NULL);
3015                         }
3016                         inp = (struct sctp_inpcb *)so->so_pcb;
3017                         SCTP_INP_INCR_REF(inp);
3018                         /*
3019                          * We add the unbound flag here so that
3020                          * if we get an soabort() before we get the
3021                          * move_pcb done, we will properly cleanup.
3022                          */
3023                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
3024                             SCTP_PCB_FLAGS_CONNECTED |
3025                             SCTP_PCB_FLAGS_IN_TCPPOOL |
3026                             SCTP_PCB_FLAGS_UNBOUND |
3027                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
3028                             SCTP_PCB_FLAGS_DONT_WAKE);
3029                         inp->sctp_features = (*inp_p)->sctp_features;
3030                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
3031                         inp->sctp_socket = so;
3032                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
3033                         inp->max_cwnd = (*inp_p)->max_cwnd;
3034                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
3035                         inp->ecn_supported = (*inp_p)->ecn_supported;
3036                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
3037                         inp->auth_supported = (*inp_p)->auth_supported;
3038                         inp->asconf_supported = (*inp_p)->asconf_supported;
3039                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
3040                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
3041                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
3042                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
3043                         inp->sctp_context = (*inp_p)->sctp_context;
3044                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
3045                         inp->fibnum = (*inp_p)->fibnum;
3046                         inp->inp_starting_point_for_iterator = NULL;
3047 #if defined(__Userspace__)
3048                         inp->ulp_info = (*inp_p)->ulp_info;
3049                         inp->recv_callback = (*inp_p)->recv_callback;
3050                         inp->send_callback = (*inp_p)->send_callback;
3051                         inp->send_sb_threshold = (*inp_p)->send_sb_threshold;
3052 #endif
3053                         /*
3054                          * copy in the authentication parameters from the
3055                          * original endpoint
3056                          */
3057                         if (inp->sctp_ep.local_hmacs)
3058                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
3059                         inp->sctp_ep.local_hmacs =
3060                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
3061                         if (inp->sctp_ep.local_auth_chunks)
3062                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
3063                         inp->sctp_ep.local_auth_chunks =
3064                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
3065
3066                         /*
3067                          * Now we must move it from one hash table to
3068                          * another and get the tcb in the right place.
3069                          */
3070
3071                         /* This is where the one-2-one socket is put into
3072                          * the accept state waiting for the accept!
3073                          */
3074                         if (*stcb) {
3075                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
3076                         }
3077                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
3078
3079                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
3080                         SCTP_TCB_UNLOCK((*stcb));
3081
3082 #if defined(__FreeBSD__) && !defined(__Userspace__)
3083                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
3084                             0);
3085 #else
3086                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, M_NOWAIT);
3087 #endif
3088                         SCTP_TCB_LOCK((*stcb));
3089                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
3090
3091
3092                         /* now we must check to see if we were aborted while
3093                          * the move was going on and the lock/unlock happened.
3094                          */
3095                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
3096                                 /* yep it was, we leave the
3097                                  * assoc attached to the socket since
3098                                  * the sctp_inpcb_free() call will send
3099                                  * an abort for us.
3100                                  */
3101                                 SCTP_INP_DECR_REF(inp);
3102                                 return (NULL);
3103                         }
3104                         SCTP_INP_DECR_REF(inp);
3105                         /* Switch over to the new guy */
3106                         *inp_p = inp;
3107                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3108                         if (send_int_conf) {
3109                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
3110                                                 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
3111                         }
3112
3113                         /* Pull it from the incomplete queue and wake the guy */
3114 #if defined(__APPLE__) && !defined(__Userspace__)
3115                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
3116                         SCTP_TCB_UNLOCK((*stcb));
3117                         SCTP_SOCKET_LOCK(so, 1);
3118 #endif
3119                         soisconnected(so);
3120 #if defined(__APPLE__) && !defined(__Userspace__)
3121                         SCTP_TCB_LOCK((*stcb));
3122                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
3123                         SCTP_SOCKET_UNLOCK(so, 1);
3124 #endif
3125                         return (m);
3126                 }
3127         }
3128         if (notification) {
3129                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3130         }
3131         if (send_int_conf) {
3132                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
3133                                 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
3134         }
3135         return (m);
3136 }
3137
3138 static void
3139 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
3140     struct sctp_tcb *stcb, struct sctp_nets *net)
3141 {
3142         /* cp must not be used, others call this without a c-ack :-) */
3143         struct sctp_association *asoc;
3144         struct sctp_tmit_chunk *chk;
3145
3146         SCTPDBG(SCTP_DEBUG_INPUT2,
3147                 "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
3148         if ((stcb == NULL) || (net == NULL)) {
3149                 return;
3150         }
3151
3152         asoc = &stcb->asoc;
3153         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
3154                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
3155                                asoc->overall_error_count,
3156                                0,
3157                                SCTP_FROM_SCTP_INPUT,
3158                                __LINE__);
3159         }
3160         asoc->overall_error_count = 0;
3161         sctp_stop_all_cookie_timers(stcb);
3162         /* process according to association state */
3163         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
3164                 /* state change only needed when I am in right state */
3165                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
3166                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
3167                 sctp_start_net_timers(stcb);
3168                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
3169                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
3170                                          stcb->sctp_ep, stcb, NULL);
3171
3172                 }
3173                 /* update RTO */
3174                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
3175                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
3176                 if (asoc->overall_error_count == 0) {
3177                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
3178                                            SCTP_RTT_FROM_NON_DATA);
3179                 }
3180                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
3181                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3182                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
3183                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
3184 #if defined(__APPLE__) && !defined(__Userspace__)
3185                         struct socket *so;
3186
3187 #endif
3188                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
3189 #if defined(__APPLE__) && !defined(__Userspace__)
3190                         so = SCTP_INP_SO(stcb->sctp_ep);
3191                         atomic_add_int(&stcb->asoc.refcnt, 1);
3192                         SCTP_TCB_UNLOCK(stcb);
3193                         SCTP_SOCKET_LOCK(so, 1);
3194                         SCTP_TCB_LOCK(stcb);
3195                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3196 #endif
3197                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
3198                                 soisconnected(stcb->sctp_socket);
3199                         }
3200 #if defined(__APPLE__) && !defined(__Userspace__)
3201                         SCTP_SOCKET_UNLOCK(so, 1);
3202 #endif
3203                 }
3204                 /*
3205                  * since we did not send a HB make sure we don't double
3206                  * things
3207                  */
3208                 net->hb_responded = 1;
3209
3210                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
3211                         /* We don't need to do the asconf thing,
3212                          * nor hb or autoclose if the socket is closed.
3213                          */
3214                         goto closed_socket;
3215                 }
3216
3217                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
3218                     stcb, net);
3219
3220
3221                 if (stcb->asoc.sctp_autoclose_ticks &&
3222                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
3223                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
3224                             stcb->sctp_ep, stcb, NULL);
3225                 }
3226                 /*
3227                  * send ASCONF if parameters are pending and ASCONFs are
3228                  * allowed (eg. addresses changed when init/cookie echo were
3229                  * in flight)
3230                  */
3231                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
3232                     (stcb->asoc.asconf_supported == 1) &&
3233                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
3234 #ifdef SCTP_TIMER_BASED_ASCONF
3235                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
3236                                          stcb->sctp_ep, stcb,
3237                                          stcb->asoc.primary_destination);
3238 #else
3239                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3240                                          SCTP_ADDR_NOT_LOCKED);
3241 #endif
3242                 }
3243         }
3244 closed_socket:
3245         /* Toss the cookie if I can */
3246         sctp_toss_old_cookies(stcb, asoc);
3247         /* Restart the timer if we have pending data */
3248         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
3249                 if (chk->whoTo != NULL) {
3250                         break;
3251                 }
3252         }
3253         if (chk != NULL) {
3254                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3255         }
3256 }
3257
3258 static void
3259 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3260                      struct sctp_tcb *stcb)
3261 {
3262         struct sctp_nets *net;
3263         struct sctp_tmit_chunk *lchk;
3264         struct sctp_ecne_chunk bkup;
3265         uint8_t override_bit;
3266         uint32_t tsn, window_data_tsn;
3267         int len;
3268         unsigned int pkt_cnt;
3269
3270         len = ntohs(cp->ch.chunk_length);
3271         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3272             (len != sizeof(struct old_sctp_ecne_chunk))) {
3273                 return;
3274         }
3275         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3276                 /* Its the old format */
3277                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3278                 bkup.num_pkts_since_cwr = htonl(1);
3279                 cp = &bkup;
3280         }
3281         SCTP_STAT_INCR(sctps_recvecne);
3282         tsn = ntohl(cp->tsn);
3283         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3284         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3285         if (lchk == NULL) {
3286                 window_data_tsn = stcb->asoc.sending_seq - 1;
3287         } else {
3288                 window_data_tsn = lchk->rec.data.tsn;
3289         }
3290
3291         /* Find where it was sent to if possible. */
3292         net = NULL;
3293         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3294                 if (lchk->rec.data.tsn == tsn) {
3295                         net = lchk->whoTo;
3296                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3297                         break;
3298                 }
3299                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
3300                         break;
3301                 }
3302         }
3303         if (net == NULL) {
3304                 /*
3305                  * What to do. A previous send of a
3306                  * CWR was possibly lost. See how old it is, we
3307                  * may have it marked on the actual net.
3308                  */
3309                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3310                         if (tsn == net->last_cwr_tsn) {
3311                                 /* Found him, send it off */
3312                                 break;
3313                         }
3314                 }
3315                 if (net == NULL) {
3316                         /*
3317                          * If we reach here, we need to send a special
3318                          * CWR that says hey, we did this a long time
3319                          * ago and you lost the response.
3320                          */
3321                         net = TAILQ_FIRST(&stcb->asoc.nets);
3322                         if (net == NULL) {
3323                                 /* TSNH */
3324                                 return;
3325                         }
3326                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3327                 } else {
3328                         override_bit = 0;
3329                 }
3330         } else {
3331                 override_bit = 0;
3332         }
3333         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3334             ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3335                 /* JRS - Use the congestion control given in the pluggable CC module */
3336                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3337                 /*
3338                  * We reduce once every RTT. So we will only lower cwnd at
3339                  * the next sending seq i.e. the window_data_tsn
3340                  */
3341                 net->cwr_window_tsn = window_data_tsn;
3342                 net->ecn_ce_pkt_cnt += pkt_cnt;
3343                 net->lost_cnt = pkt_cnt;
3344                 net->last_cwr_tsn = tsn;
3345         } else {
3346                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3347                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3348                     ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3349                         /*
3350                          * Another loss in the same window update how
3351                          * many marks/packets lost we have had.
3352                          */
3353                         int cnt = 1;
3354                         if (pkt_cnt > net->lost_cnt) {
3355                                 /* Should be the case */
3356                                 cnt = (pkt_cnt - net->lost_cnt);
3357                                 net->ecn_ce_pkt_cnt += cnt;
3358                         }
3359                         net->lost_cnt = pkt_cnt;
3360                         net->last_cwr_tsn = tsn;
3361                         /*
3362                          * Most CC functions will ignore this call, since we are in-window
3363                          * yet of the initial CE the peer saw.
3364                          */
3365                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3366                 }
3367         }
3368         /*
3369          * We always send a CWR this way if our previous one was lost our
3370          * peer will get an update, or if it is not time again to reduce we
3371          * still get the cwr to the peer. Note we set the override when we
3372          * could not find the TSN on the chunk or the destination network.
3373          */
3374         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3375 }
3376
3377 static void
3378 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3379 {
3380         /*
3381          * Here we get a CWR from the peer. We must look in the outqueue and
3382          * make sure that we have a covered ECNE in the control chunk part.
3383          * If so remove it.
3384          */
3385         struct sctp_tmit_chunk *chk, *nchk;
3386         struct sctp_ecne_chunk *ecne;
3387         int override;
3388         uint32_t cwr_tsn;
3389
3390         cwr_tsn = ntohl(cp->tsn);
3391         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3392         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
3393                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3394                         continue;
3395                 }
3396                 if ((override == 0) && (chk->whoTo != net)) {
3397                         /* Must be from the right src unless override is set */
3398                         continue;
3399                 }
3400                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3401                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3402                         /* this covers this ECNE, we can remove it */
3403                         stcb->asoc.ecn_echo_cnt_onq--;
3404                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3405                             sctp_next);
3406                         stcb->asoc.ctrl_queue_cnt--;
3407                         sctp_m_freem(chk->data);
3408                         chk->data = NULL;
3409                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3410                         if (override == 0) {
3411                                 break;
3412                         }
3413                 }
3414         }
3415 }
3416
3417 static void
3418 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3419     struct sctp_tcb *stcb, struct sctp_nets *net)
3420 {
3421 #if defined(__APPLE__) && !defined(__Userspace__)
3422         struct socket *so;
3423 #endif
3424
3425         SCTPDBG(SCTP_DEBUG_INPUT2,
3426                 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3427         if (stcb == NULL)
3428                 return;
3429
3430         /* process according to association state */
3431         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3432                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3433                 SCTPDBG(SCTP_DEBUG_INPUT2,
3434                         "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3435                 SCTP_TCB_UNLOCK(stcb);
3436                 return;
3437         }
3438         /* notify upper layer protocol */
3439         if (stcb->sctp_socket) {
3440                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3441         }
3442 #ifdef INVARIANTS
3443         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3444             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3445             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3446                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3447         }
3448 #endif
3449         /* stop the timer */
3450         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3451                         SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3452         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3453         /* free the TCB */
3454         SCTPDBG(SCTP_DEBUG_INPUT2,
3455                 "sctp_handle_shutdown_complete: calls free-asoc\n");
3456 #if defined(__APPLE__) && !defined(__Userspace__)
3457         so = SCTP_INP_SO(stcb->sctp_ep);
3458         atomic_add_int(&stcb->asoc.refcnt, 1);
3459         SCTP_TCB_UNLOCK(stcb);
3460         SCTP_SOCKET_LOCK(so, 1);
3461         SCTP_TCB_LOCK(stcb);
3462         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3463 #endif
3464         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3465                               SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3466 #if defined(__APPLE__) && !defined(__Userspace__)
3467         SCTP_SOCKET_UNLOCK(so, 1);
3468 #endif
3469         return;
3470 }
3471
3472 static int
3473 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3474     struct sctp_nets *net, uint8_t flg)
3475 {
3476         switch (desc->chunk_type) {
3477         case SCTP_DATA:
3478         case SCTP_IDATA:
3479                 /* find the tsn to resend (possibly) */
3480         {
3481                 uint32_t tsn;
3482                 struct sctp_tmit_chunk *tp1;
3483
3484                 tsn = ntohl(desc->tsn_ifany);
3485                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3486                         if (tp1->rec.data.tsn == tsn) {
3487                                 /* found it */
3488                                 break;
3489                         }
3490                         if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3491                                 /* not found */
3492                                 tp1 = NULL;
3493                                 break;
3494                         }
3495                 }
3496                 if (tp1 == NULL) {
3497                         /*
3498                          * Do it the other way , aka without paying
3499                          * attention to queue seq order.
3500                          */
3501                         SCTP_STAT_INCR(sctps_pdrpdnfnd);
3502                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3503                                 if (tp1->rec.data.tsn == tsn) {
3504                                         /* found it */
3505                                         break;
3506                                 }
3507                         }
3508                 }
3509                 if (tp1 == NULL) {
3510                         SCTP_STAT_INCR(sctps_pdrptsnnf);
3511                 }
3512                 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3513                         if (((flg & SCTP_BADCRC) == 0) &&
3514                             ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3515                                 return (0);
3516                         }
3517                         if ((stcb->asoc.peers_rwnd == 0) &&
3518                             ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3519                                 SCTP_STAT_INCR(sctps_pdrpdiwnp);
3520                                 return (0);
3521                         }
3522                         if (stcb->asoc.peers_rwnd == 0 &&
3523                             (flg & SCTP_FROM_MIDDLE_BOX)) {
3524                                 SCTP_STAT_INCR(sctps_pdrpdizrw);
3525                                 return (0);
3526                         }
3527                         if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
3528                             SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
3529                                 /* Payload not matching. */
3530                                 SCTP_STAT_INCR(sctps_pdrpbadd);
3531                                 return (-1);
3532                         }
3533                         if (memcmp(mtod(tp1->data, caddr_t) + SCTP_DATA_CHUNK_OVERHEAD(stcb),
3534                                    desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
3535                                 /* Payload not matching. */
3536                                 SCTP_STAT_INCR(sctps_pdrpbadd);
3537                                 return (-1);
3538                         }
3539                         if (tp1->do_rtt) {
3540                                 /*
3541                                  * this guy had a RTO calculation
3542                                  * pending on it, cancel it
3543                                  */
3544                                 if (tp1->whoTo->rto_needed == 0) {
3545                                         tp1->whoTo->rto_needed = 1;
3546                                 }
3547                                 tp1->do_rtt = 0;
3548                         }
3549                         SCTP_STAT_INCR(sctps_pdrpmark);
3550                         if (tp1->sent != SCTP_DATAGRAM_RESEND)
3551                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3552                         /*
3553                          * mark it as if we were doing a FR, since
3554                          * we will be getting gap ack reports behind
3555                          * the info from the router.
3556                          */
3557                         tp1->rec.data.doing_fast_retransmit = 1;
3558                         /*
3559                          * mark the tsn with what sequences can
3560                          * cause a new FR.
3561                          */
3562                         if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3563                                 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3564                         } else {
3565                                 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3566                         }
3567
3568                         /* restart the timer */
3569                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3570                                         stcb, tp1->whoTo,
3571                                         SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3572                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3573                                          stcb, tp1->whoTo);
3574
3575                         /* fix counts and things */
3576                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3577                                 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3578                                                tp1->whoTo->flight_size,
3579                                                tp1->book_size,
3580                                                (uint32_t)(uintptr_t)stcb,
3581                                                tp1->rec.data.tsn);
3582                         }
3583                         if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3584                                 sctp_flight_size_decrease(tp1);
3585                                 sctp_total_flight_decrease(stcb, tp1);
3586                         }
3587                         tp1->sent = SCTP_DATAGRAM_RESEND;
3588                 } {
3589                         /* audit code */
3590                         unsigned int audit;
3591
3592                         audit = 0;
3593                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3594                                 if (tp1->sent == SCTP_DATAGRAM_RESEND)
3595                                         audit++;
3596                         }
3597                         TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3598                                       sctp_next) {
3599                                 if (tp1->sent == SCTP_DATAGRAM_RESEND)
3600                                         audit++;
3601                         }
3602                         if (audit != stcb->asoc.sent_queue_retran_cnt) {
3603                                 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3604                                             audit, stcb->asoc.sent_queue_retran_cnt);
3605 #ifndef SCTP_AUDITING_ENABLED
3606                                 stcb->asoc.sent_queue_retran_cnt = audit;
3607 #endif
3608                         }
3609                 }
3610         }
3611         break;
3612         case SCTP_ASCONF:
3613         {
3614                 struct sctp_tmit_chunk *asconf;
3615
3616                 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3617                               sctp_next) {
3618                         if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3619                                 break;
3620                         }
3621                 }
3622                 if (asconf) {
3623                         if (asconf->sent != SCTP_DATAGRAM_RESEND)
3624                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3625                         asconf->sent = SCTP_DATAGRAM_RESEND;
3626                         asconf->snd_count--;
3627                 }
3628         }
3629         break;
3630         case SCTP_INITIATION:
3631                 /* resend the INIT */
3632                 stcb->asoc.dropped_special_cnt++;
3633                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3634                         /*
3635                          * If we can get it in, in a few attempts we do
3636                          * this, otherwise we let the timer fire.
3637                          */
3638                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3639                                         stcb, net,
3640                                         SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3641                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3642                 }
3643                 break;
3644         case SCTP_SELECTIVE_ACK:
3645         case SCTP_NR_SELECTIVE_ACK:
3646                 /* resend the sack */
3647                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3648                 break;
3649         case SCTP_HEARTBEAT_REQUEST:
3650                 /* resend a demand HB */
3651                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3652                         /* Only retransmit if we KNOW we wont destroy the tcb */
3653                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3654                 }
3655                 break;
3656         case SCTP_SHUTDOWN:
3657                 sctp_send_shutdown(stcb, net);
3658                 break;
3659         case SCTP_SHUTDOWN_ACK:
3660                 sctp_send_shutdown_ack(stcb, net);
3661                 break;
3662         case SCTP_COOKIE_ECHO:
3663         {
3664                 struct sctp_tmit_chunk *cookie;
3665
3666                 cookie = NULL;
3667                 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3668                               sctp_next) {
3669                         if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3670                                 break;
3671                         }
3672                 }
3673                 if (cookie) {
3674                         if (cookie->sent != SCTP_DATAGRAM_RESEND)
3675                                 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3676                         cookie->sent = SCTP_DATAGRAM_RESEND;
3677                         sctp_stop_all_cookie_timers(stcb);
3678                 }
3679         }
3680         break;
3681         case SCTP_COOKIE_ACK:
3682                 sctp_send_cookie_ack(stcb);
3683                 break;
3684         case SCTP_ASCONF_ACK:
3685                 /* resend last asconf ack */
3686                 sctp_send_asconf_ack(stcb);
3687                 break;
3688         case SCTP_IFORWARD_CUM_TSN:
3689         case SCTP_FORWARD_CUM_TSN:
3690                 send_forward_tsn(stcb, &stcb->asoc);
3691                 break;
3692                 /* can't do anything with these */
3693         case SCTP_PACKET_DROPPED:
3694         case SCTP_INITIATION_ACK:       /* this should not happen */
3695         case SCTP_HEARTBEAT_ACK:
3696         case SCTP_ABORT_ASSOCIATION:
3697         case SCTP_OPERATION_ERROR:
3698         case SCTP_SHUTDOWN_COMPLETE:
3699         case SCTP_ECN_ECHO:
3700         case SCTP_ECN_CWR:
3701         default:
3702                 break;
3703         }
3704         return (0);
3705 }
3706
3707 void
3708 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3709 {
3710         uint32_t i;
3711         uint16_t temp;
3712
3713         /*
3714          * We set things to 0xffffffff since this is the last delivered sequence
3715          * and we will be sending in 0 after the reset.
3716          */
3717
3718         if (number_entries) {
3719                 for (i = 0; i < number_entries; i++) {
3720                         temp = ntohs(list[i]);
3721                         if (temp >= stcb->asoc.streamincnt) {
3722                                 continue;
3723                         }
3724                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3725                 }
3726         } else {
3727                 list = NULL;
3728                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3729                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3730                 }
3731         }
3732         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3733 }
3734
3735 static void
3736 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3737 {
3738         uint32_t i;
3739         uint16_t temp;
3740
3741         if (number_entries > 0) {
3742                 for (i = 0; i < number_entries; i++) {
3743                         temp = ntohs(list[i]);
3744                         if (temp >= stcb->asoc.streamoutcnt) {
3745                                 /* no such stream */
3746                                 continue;
3747                         }
3748                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3749                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3750                 }
3751         } else {
3752                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3753                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3754                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3755                 }
3756         }
3757         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3758 }
3759
3760 static void
3761 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3762 {
3763         uint32_t i;
3764         uint16_t temp;
3765
3766         if (number_entries > 0) {
3767                 for (i = 0; i < number_entries; i++) {
3768                         temp = ntohs(list[i]);
3769                         if (temp >= stcb->asoc.streamoutcnt) {
3770                                 /* no such stream */
3771                                 continue;
3772                         }
3773                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3774                 }
3775         } else {
3776                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3777                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3778                 }
3779         }
3780 }
3781
3782
3783 struct sctp_stream_reset_request *
3784 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3785 {
3786         struct sctp_association *asoc;
3787         struct sctp_chunkhdr *ch;
3788         struct sctp_stream_reset_request *r;
3789         struct sctp_tmit_chunk *chk;
3790         int len, clen;
3791
3792         asoc = &stcb->asoc;
3793         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3794                 asoc->stream_reset_outstanding = 0;
3795                 return (NULL);
3796         }
3797         if (stcb->asoc.str_reset == NULL) {
3798                 asoc->stream_reset_outstanding = 0;
3799                 return (NULL);
3800         }
3801         chk = stcb->asoc.str_reset;
3802         if (chk->data == NULL) {
3803                 return (NULL);
3804         }
3805         if (bchk) {
3806                 /* he wants a copy of the chk pointer */
3807                 *bchk = chk;
3808         }
3809         clen = chk->send_size;
3810         ch = mtod(chk->data, struct sctp_chunkhdr *);
3811         r = (struct sctp_stream_reset_request *)(ch + 1);
3812         if (ntohl(r->request_seq) == seq) {
3813                 /* found it */
3814                 return (r);
3815         }
3816         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3817         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3818                 /* move to the next one, there can only be a max of two */
3819                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3820                 if (ntohl(r->request_seq) == seq) {
3821                         return (r);
3822                 }
3823         }
3824         /* that seq is not here */
3825         return (NULL);
3826 }
3827
3828 static void
3829 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3830 {
3831         struct sctp_association *asoc;
3832         struct sctp_tmit_chunk *chk;
3833
3834         asoc = &stcb->asoc;
3835         chk = asoc->str_reset;
3836         if (chk == NULL) {
3837                 return;
3838         }
3839         asoc->str_reset = NULL;
3840         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3841                         NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3842         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3843         asoc->ctrl_queue_cnt--;
3844         if (chk->data) {
3845                 sctp_m_freem(chk->data);
3846                 chk->data = NULL;
3847         }
3848         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3849 }
3850
3851
3852 static int
3853 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3854                                   uint32_t seq, uint32_t action,
3855                                   struct sctp_stream_reset_response *respin)
3856 {
3857         uint16_t type;
3858         int lparam_len;
3859         struct sctp_association *asoc = &stcb->asoc;
3860         struct sctp_tmit_chunk *chk;
3861         struct sctp_stream_reset_request *req_param;
3862         struct sctp_stream_reset_out_request *req_out_param;
3863         struct sctp_stream_reset_in_request *req_in_param;
3864         uint32_t number_entries;
3865
3866         if (asoc->stream_reset_outstanding == 0) {
3867                 /* duplicate */
3868                 return (0);
3869         }
3870         if (seq == stcb->asoc.str_reset_seq_out) {
3871                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3872                 if (req_param != NULL) {
3873                         stcb->asoc.str_reset_seq_out++;
3874                         type = ntohs(req_param->ph.param_type);
3875                         lparam_len = ntohs(req_param->ph.param_length);
3876                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3877                                 int no_clear = 0;
3878
3879                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3880                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3881                                 asoc->stream_reset_out_is_outstanding = 0;
3882                                 if (asoc->stream_reset_outstanding)
3883                                         asoc->stream_reset_outstanding--;
3884                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3885                                         /* do it */
3886                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3887                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3888                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3889                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3890                                         /* Set it up so we don't stop retransmitting */
3891                                         asoc->stream_reset_outstanding++;
3892                                         stcb->asoc.str_reset_seq_out--;
3893                                         asoc->stream_reset_out_is_outstanding = 1;
3894                                         no_clear = 1;
3895                                 } else {
3896                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3897                                 }
3898                                 if (no_clear == 0) {
3899                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3900                                 }
3901                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3902                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3903                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3904                                 if (asoc->stream_reset_outstanding)
3905                                         asoc->stream_reset_outstanding--;
3906                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3907                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3908                                                         number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3909                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3910                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3911                                                         number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3912                                 }
3913                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3914                                 /* Ok we now may have more streams */
3915                                 int num_stream;
3916
3917                                 num_stream = stcb->asoc.strm_pending_add_size;
3918                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3919                                         /* TSNH */
3920                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3921                                 }
3922                                 stcb->asoc.strm_pending_add_size = 0;
3923                                 if (asoc->stream_reset_outstanding)
3924                                         asoc->stream_reset_outstanding--;
3925                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3926                                         /* Put the new streams into effect */
3927                                         int i;
3928                                         for ( i = asoc->streamoutcnt; i< (asoc->streamoutcnt + num_stream); i++) {
3929                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3930                                         }
3931                                         asoc->streamoutcnt += num_stream;
3932                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3933                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3934                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3935                                                                      SCTP_STREAM_CHANGE_DENIED);
3936                                 } else {
3937                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3938                                                                      SCTP_STREAM_CHANGE_FAILED);
3939                                 }
3940                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3941                                 if (asoc->stream_reset_outstanding)
3942                                         asoc->stream_reset_outstanding--;
3943                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3944                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3945                                                                      SCTP_STREAM_CHANGE_DENIED);
3946                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3947                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3948                                                                      SCTP_STREAM_CHANGE_FAILED);
3949                                 }
3950                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3951                                 /**
3952                                  * a) Adopt the new in tsn.
3953                                  * b) reset the map
3954                                  * c) Adopt the new out-tsn
3955                                  */
3956                                 struct sctp_stream_reset_response_tsn *resp;
3957                                 struct sctp_forward_tsn_chunk fwdtsn;
3958                                 int abort_flag = 0;
3959                                 if (respin == NULL) {
3960                                         /* huh ? */
3961                                         return (0);
3962                                 }
3963                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3964                                         return (0);
3965                                 }
3966                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3967                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3968                                         asoc->stream_reset_outstanding--;
3969                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3970                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3971                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3972                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3973                                         if (abort_flag) {
3974                                                 return (1);
3975                                         }
3976                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3977                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3978                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3979                                         }
3980
3981                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3982                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3983                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3984
3985                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3986                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3987
3988                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3989                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3990
3991                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3992                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3993                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3994                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3995                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3996                                                                      SCTP_ASSOC_RESET_DENIED);
3997                                 } else {
3998                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3999                                                                      SCTP_ASSOC_RESET_FAILED);
4000                                 }
4001                         }
4002                         /* get rid of the request and get the request flags */
4003                         if (asoc->stream_reset_outstanding == 0) {
4004                                 sctp_clean_up_stream_reset(stcb);
4005                         }
4006                 }
4007         }
4008         if (asoc->stream_reset_outstanding == 0) {
4009                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
4010         }
4011         return (0);
4012 }
4013
4014 static void
4015 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
4016     struct sctp_tmit_chunk *chk,
4017     struct sctp_stream_reset_in_request *req, int trunc)
4018 {
4019         uint32_t seq;
4020         int len, i;
4021         int number_entries;
4022         uint16_t temp;
4023
4024         /*
4025          * peer wants me to send a str-reset to him for my outgoing seq's if
4026          * seq_in is right.
4027          */
4028         struct sctp_association *asoc = &stcb->asoc;
4029
4030         seq = ntohl(req->request_seq);
4031         if (asoc->str_reset_seq_in == seq) {
4032                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
4033                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
4034                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4035                 } else if (trunc) {
4036                         /* Can't do it, since they exceeded our buffer size  */
4037                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4038                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
4039                         len = ntohs(req->ph.param_length);
4040                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
4041                         if (number_entries) {
4042                                 for (i = 0; i < number_entries; i++) {
4043                                         temp = ntohs(req->list_of_streams[i]);
4044                                         if (temp >= stcb->asoc.streamoutcnt) {
4045                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4046                                                 goto bad_boy;
4047                                         }
4048                                         req->list_of_streams[i] = temp;
4049                                 }
4050                                 for (i = 0; i < number_entries; i++) {
4051                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
4052                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
4053                                         }
4054                                 }
4055                         } else {
4056                                 /* Its all */
4057                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
4058                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
4059                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
4060                                 }
4061                         }
4062                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4063                 } else {
4064                         /* Can't do it, since we have sent one out */
4065                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4066                 }
4067         bad_boy:
4068                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4069                 asoc->str_reset_seq_in++;
4070         } else if (asoc->str_reset_seq_in - 1 == seq) {
4071                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4072         } else if (asoc->str_reset_seq_in - 2 == seq) {
4073                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4074         } else {
4075                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4076         }
4077         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
4078 }
4079
4080 static int
4081 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
4082     struct sctp_tmit_chunk *chk,
4083     struct sctp_stream_reset_tsn_request *req)
4084 {
4085         /* reset all in and out and update the tsn */
4086         /*
4087          * A) reset my str-seq's on in and out. B) Select a receive next,
4088          * and set cum-ack to it. Also process this selected number as a
4089          * fwd-tsn as well. C) set in the response my next sending seq.
4090          */
4091         struct sctp_forward_tsn_chunk fwdtsn;
4092         struct sctp_association *asoc = &stcb->asoc;
4093         int abort_flag = 0;
4094         uint32_t seq;
4095
4096         seq = ntohl(req->request_seq);
4097         if (asoc->str_reset_seq_in == seq) {
4098                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
4099                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4100                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4101                 } else {
4102                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
4103                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
4104                         fwdtsn.ch.chunk_flags = 0;
4105                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
4106                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
4107                         if (abort_flag) {
4108                                 return (1);
4109                         }
4110                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
4111                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
4112                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
4113                         }
4114                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
4115                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
4116                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
4117                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
4118                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
4119                         atomic_add_int(&asoc->sending_seq, 1);
4120                         /* save off historical data for retrans */
4121                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
4122                         asoc->last_sending_seq[0] = asoc->sending_seq;
4123                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
4124                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
4125                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
4126                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
4127                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4128                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
4129                 }
4130                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
4131                                                  asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
4132                 asoc->str_reset_seq_in++;
4133         } else if (asoc->str_reset_seq_in - 1 == seq) {
4134                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
4135                                                  asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
4136         } else if (asoc->str_reset_seq_in - 2 == seq) {
4137                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
4138                                                  asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
4139         } else {
4140                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4141         }
4142         return (0);
4143 }
4144
4145 static void
4146 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
4147     struct sctp_tmit_chunk *chk,
4148     struct sctp_stream_reset_out_request *req, int trunc)
4149 {
4150         uint32_t seq, tsn;
4151         int number_entries, len;
4152         struct sctp_association *asoc = &stcb->asoc;
4153
4154         seq = ntohl(req->request_seq);
4155
4156         /* now if its not a duplicate we process it */
4157         if (asoc->str_reset_seq_in == seq) {
4158                 len = ntohs(req->ph.param_length);
4159                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
4160                 /*
4161                  * the sender is resetting, handle the list issue.. we must
4162                  * a) verify if we can do the reset, if so no problem b) If
4163                  * we can't do the reset we must copy the request. c) queue
4164                  * it, and setup the data in processor to trigger it off
4165                  * when needed and dequeue all the queued data.
4166                  */
4167                 tsn = ntohl(req->send_reset_at_tsn);
4168
4169                 /* move the reset action back one */
4170                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
4171                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
4172                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4173                 } else if (trunc) {
4174                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4175                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
4176                         /* we can do it now */
4177                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
4178                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4179                 } else {
4180                         /*
4181                          * we must queue it up and thus wait for the TSN's
4182                          * to arrive that are at or before tsn
4183                          */
4184                         struct sctp_stream_reset_list *liste;
4185                         int siz;
4186
4187                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
4188                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
4189                                     siz, SCTP_M_STRESET);
4190                         if (liste == NULL) {
4191                                 /* gak out of memory */
4192                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4193                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4194                                 return;
4195                         }
4196                         liste->seq = seq;
4197                         liste->tsn = tsn;
4198                         liste->number_entries = number_entries;
4199                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
4200                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
4201                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
4202                 }
4203                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4204                 asoc->str_reset_seq_in++;
4205         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4206                 /*
4207                  * one seq back, just echo back last action since my
4208                  * response was lost.
4209                  */
4210                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4211         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4212                 /*
4213                  * two seq back, just echo back last action since my
4214                  * response was lost.
4215                  */
4216                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4217         } else {
4218                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4219         }
4220 }
4221
4222 static void
4223 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4224                                struct sctp_stream_reset_add_strm  *str_add)
4225 {
4226         /*
4227          * Peer is requesting to add more streams.
4228          * If its within our max-streams we will
4229          * allow it.
4230          */
4231         uint32_t num_stream, i;
4232         uint32_t seq;
4233         struct sctp_association *asoc = &stcb->asoc;
4234         struct sctp_queued_to_read *ctl, *nctl;
4235
4236         /* Get the number. */
4237         seq = ntohl(str_add->request_seq);
4238         num_stream = ntohs(str_add->number_of_streams);
4239         /* Now what would be the new total? */
4240         if (asoc->str_reset_seq_in == seq) {
4241                 num_stream += stcb->asoc.streamincnt;
4242                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4243                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4244                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4245                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4246                            (num_stream > 0xffff)) {
4247                         /* We must reject it they ask for to many */
4248   denied:
4249                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4250                 } else {
4251                         /* Ok, we can do that :-) */
4252                         struct sctp_stream_in *oldstrm;
4253
4254                         /* save off the old */
4255                         oldstrm = stcb->asoc.strmin;
4256                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4257                                     (num_stream * sizeof(struct sctp_stream_in)),
4258                                     SCTP_M_STRMI);
4259                         if (stcb->asoc.strmin == NULL) {
4260                                 stcb->asoc.strmin = oldstrm;
4261                                 goto denied;
4262                         }
4263                         /* copy off the old data */
4264                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4265                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4266                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4267                                 stcb->asoc.strmin[i].sid = i;
4268                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
4269                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4270                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
4271                                 /* now anything on those queues? */
4272                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
4273                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
4274                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
4275                                 }
4276                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
4277                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
4278                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
4279                                 }
4280                         }
4281                         /* Init the new streams */
4282                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4283                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4284                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4285                                 stcb->asoc.strmin[i].sid = i;
4286                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
4287                                 stcb->asoc.strmin[i].pd_api_started = 0;
4288                                 stcb->asoc.strmin[i].delivery_started = 0;
4289                         }
4290                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4291                         /* update the size */
4292                         stcb->asoc.streamincnt = num_stream;
4293                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4294                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4295                 }
4296                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4297                 asoc->str_reset_seq_in++;
4298         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4299                 /*
4300                  * one seq back, just echo back last action since my
4301                  * response was lost.
4302                  */
4303                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4304         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4305                 /*
4306                  * two seq back, just echo back last action since my
4307                  * response was lost.
4308                  */
4309                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4310         } else {
4311                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4312
4313         }
4314 }
4315
4316 static void
4317 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4318                                    struct sctp_stream_reset_add_strm  *str_add)
4319 {
4320         /*
4321          * Peer is requesting to add more streams.
4322          * If its within our max-streams we will
4323          * allow it.
4324          */
4325         uint16_t num_stream;
4326         uint32_t seq;
4327         struct sctp_association *asoc = &stcb->asoc;
4328
4329         /* Get the number. */
4330         seq = ntohl(str_add->request_seq);
4331         num_stream = ntohs(str_add->number_of_streams);
4332         /* Now what would be the new total? */
4333         if (asoc->str_reset_seq_in == seq) {
4334                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4335                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4336                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4337                 } else if (stcb->asoc.stream_reset_outstanding) {
4338                         /* We must reject it we have something pending */
4339                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4340                 } else {
4341                         /* Ok, we can do that :-) */
4342                         int mychk;
4343                         mychk = stcb->asoc.streamoutcnt;
4344                         mychk += num_stream;
4345                         if (mychk < 0x10000) {
4346                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4347                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4348                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4349                                 }
4350                         } else {
4351                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4352                         }
4353                 }
4354                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4355                 asoc->str_reset_seq_in++;
4356         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4357                 /*
4358                  * one seq back, just echo back last action since my
4359                  * response was lost.
4360                  */
4361                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4362         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4363                 /*
4364                  * two seq back, just echo back last action since my
4365                  * response was lost.
4366                  */
4367                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4368         } else {
4369                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4370         }
4371 }
4372
4373 #ifdef __GNUC__
4374 __attribute__ ((noinline))
4375 #endif
4376 static int
4377 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4378                          struct sctp_chunkhdr *ch_req)
4379 {
4380         uint16_t remaining_length, param_len, ptype;
4381         struct sctp_paramhdr pstore;
4382         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4383         uint32_t seq = 0;
4384         int num_req = 0;
4385         int trunc = 0;
4386         struct sctp_tmit_chunk *chk;
4387         struct sctp_chunkhdr *ch;
4388         struct sctp_paramhdr *ph;
4389         int ret_code = 0;
4390         int num_param = 0;
4391
4392         /* now it may be a reset or a reset-response */
4393         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4394
4395         /* setup for adding the response */
4396         sctp_alloc_a_chunk(stcb, chk);
4397         if (chk == NULL) {
4398                 return (ret_code);
4399         }
4400         chk->copy_by_ref = 0;
4401         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4402         chk->rec.chunk_id.can_take_data = 0;
4403         chk->flags = 0;
4404         chk->asoc = &stcb->asoc;
4405         chk->no_fr_allowed = 0;
4406         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4407         chk->book_size_scale = 0;
4408         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4409         if (chk->data == NULL) {
4410         strres_nochunk:
4411                 if (chk->data) {
4412                         sctp_m_freem(chk->data);
4413                         chk->data = NULL;
4414                 }
4415                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4416                 return (ret_code);
4417         }
4418         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4419
4420         /* setup chunk parameters */
4421         chk->sent = SCTP_DATAGRAM_UNSENT;
4422         chk->snd_count = 0;
4423         chk->whoTo = NULL;
4424
4425         ch = mtod(chk->data, struct sctp_chunkhdr *);
4426         ch->chunk_type = SCTP_STREAM_RESET;
4427         ch->chunk_flags = 0;
4428         ch->chunk_length = htons(chk->send_size);
4429         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4430         offset += sizeof(struct sctp_chunkhdr);
4431         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4432                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4433                 if (ph == NULL) {
4434                         /* TSNH */
4435                         break;
4436                 }
4437                 param_len = ntohs(ph->param_length);
4438                 if ((param_len > remaining_length) ||
4439                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4440                         /* bad parameter length */
4441                         break;
4442                 }
4443                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4444                                                            (uint8_t *)&cstore);
4445                 if (ph == NULL) {
4446                         /* TSNH */
4447                         break;
4448                 }
4449                 ptype = ntohs(ph->param_type);
4450                 num_param++;
4451                 if (param_len > sizeof(cstore)) {
4452                         trunc = 1;
4453                 } else {
4454                         trunc = 0;
4455                 }
4456                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4457                         /* hit the max of parameters already sorry.. */
4458                         break;
4459                 }
4460                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4461                         struct sctp_stream_reset_out_request *req_out;
4462
4463                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4464                                 break;
4465                         }
4466                         req_out = (struct sctp_stream_reset_out_request *)ph;
4467                         num_req++;
4468                         if (stcb->asoc.stream_reset_outstanding) {
4469                                 seq = ntohl(req_out->response_seq);
4470                                 if (seq == stcb->asoc.str_reset_seq_out) {
4471                                         /* implicit ack */
4472                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4473                                 }
4474                         }
4475                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4476                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4477                         struct sctp_stream_reset_add_strm  *str_add;
4478
4479                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4480                                 break;
4481                         }
4482                         str_add = (struct sctp_stream_reset_add_strm  *)ph;
4483                         num_req++;
4484                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4485                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4486                         struct sctp_stream_reset_add_strm  *str_add;
4487
4488                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4489                                 break;
4490                         }
4491                         str_add = (struct sctp_stream_reset_add_strm  *)ph;
4492                         num_req++;
4493                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4494                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4495                         struct sctp_stream_reset_in_request *req_in;
4496
4497                         num_req++;
4498                         req_in = (struct sctp_stream_reset_in_request *)ph;
4499                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4500                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4501                         struct sctp_stream_reset_tsn_request *req_tsn;
4502
4503                         num_req++;
4504                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4505                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4506                                 ret_code = 1;
4507                                 goto strres_nochunk;
4508                         }
4509                         /* no more */
4510                         break;
4511                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4512                         struct sctp_stream_reset_response *resp;
4513                         uint32_t result;
4514
4515                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4516                                 break;
4517                         }
4518                         resp = (struct sctp_stream_reset_response *)ph;
4519                         seq = ntohl(resp->response_seq);
4520                         result = ntohl(resp->result);
4521                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4522                                 ret_code = 1;
4523                                 goto strres_nochunk;
4524                         }
4525                 } else {
4526                         break;
4527                 }
4528                 offset += SCTP_SIZE32(param_len);
4529                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4530                         remaining_length -= SCTP_SIZE32(param_len);
4531                 } else {
4532                         remaining_length = 0;
4533                 }
4534         }
4535         if (num_req == 0) {
4536                 /* we have no response free the stuff */
4537                 goto strres_nochunk;
4538         }
4539         /* ok we have a chunk to link in */
4540         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4541                           chk,
4542                           sctp_next);
4543         stcb->asoc.ctrl_queue_cnt++;
4544         return (ret_code);
4545 }
4546
4547 /*
4548  * Handle a router or endpoints report of a packet loss, there are two ways
4549  * to handle this, either we get the whole packet and must disect it
4550  * ourselves (possibly with truncation and or corruption) or it is a summary
4551  * from a middle box that did the disectting for us.
4552  */
4553 static void
4554 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4555     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4556 {
4557         struct sctp_chunk_desc desc;
4558         struct sctp_chunkhdr *chk_hdr;
4559         struct sctp_data_chunk *data_chunk;
4560         struct sctp_idata_chunk *idata_chunk;
4561         uint32_t bottle_bw, on_queue;
4562         uint32_t offset, chk_len;
4563         uint16_t trunc_len;
4564         uint16_t pktdrp_len;
4565         uint8_t pktdrp_flags;
4566
4567         KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
4568                 ("PKTDROP chunk too small"));
4569         pktdrp_flags = cp->ch.chunk_flags;
4570         pktdrp_len = ntohs(cp->ch.chunk_length);
4571         KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
4572         if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
4573                 trunc_len = ntohs(cp->trunc_len);
4574                 if (trunc_len <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
4575                         /* The peer plays games with us. */
4576                         return;
4577                 }
4578         } else {
4579                 trunc_len = 0;
4580         }
4581         limit -= sizeof(struct sctp_pktdrop_chunk);
4582         offset = 0;
4583         if (offset == limit) {
4584                 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4585                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4586                 }
4587         } else if (offset + sizeof(struct sctphdr) > limit) {
4588                 /* Only a partial SCTP common header. */
4589                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4590                 offset = limit;
4591         } else {
4592                 /* XXX: Check embedded SCTP common header. */
4593                 offset += sizeof(struct sctphdr);
4594         }
4595         /* Now parse through the chunks themselves. */
4596         while (offset < limit) {
4597                 if (offset + sizeof(struct sctp_chunkhdr) > limit) {
4598                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4599                         break;
4600                 }
4601                 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
4602                 desc.chunk_type = chk_hdr->chunk_type;
4603                 /* get amount we need to move */
4604                 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
4605                 if (chk_len < sizeof(struct sctp_chunkhdr)) {
4606                         /* Someone is lying... */
4607                         break;
4608                 }
4609                 if (desc.chunk_type == SCTP_DATA) {
4610                         if (stcb->asoc.idata_supported) {
4611                                 /* Some is playing games with us. */
4612                                 break;
4613                         }
4614                         if (chk_len <= sizeof(struct sctp_data_chunk)) {
4615                                 /* Some is playing games with us. */
4616                                 break;
4617                         }
4618                         if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4619                                 /* Not enough data bytes available in the chunk. */
4620                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4621                                 goto next_chunk;
4622                         }
4623                         if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4624                                 /* Not enough data in buffer. */
4625                                 break;
4626                         }
4627                         data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
4628                         memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4629                         desc.tsn_ifany = data_chunk->dp.tsn;
4630                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4631                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4632                         }
4633                 } else if (desc.chunk_type == SCTP_IDATA) {
4634                         if (!stcb->asoc.idata_supported) {
4635                                 /* Some is playing games with us. */
4636                                 break;
4637                         }
4638                         if (chk_len <= sizeof(struct sctp_idata_chunk)) {
4639                                 /* Some is playing games with us. */
4640                                 break;
4641                         }
4642                         if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
4643                                 /* Not enough data bytes available in the chunk. */
4644                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4645                                 goto next_chunk;
4646                         }
4647                         if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
4648                                 /* Not enough data in buffer. */
4649                                 break;
4650                         }
4651                         idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
4652                         memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
4653                         desc.tsn_ifany = idata_chunk->dp.tsn;
4654                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4655                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4656                         }
4657                 } else {
4658                         if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
4659                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4660                         }
4661                 }
4662                 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
4663                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4664                         break;
4665                 }
4666 next_chunk:
4667                 offset += SCTP_SIZE32(chk_len);
4668         }
4669         /* Now update any rwnd --- possibly */
4670         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4671                 /* From a peer, we get a rwnd report */
4672                 uint32_t a_rwnd;
4673
4674                 SCTP_STAT_INCR(sctps_pdrpfehos);
4675
4676                 bottle_bw = ntohl(cp->bottle_bw);
4677                 on_queue = ntohl(cp->current_onq);
4678                 if (bottle_bw && on_queue) {
4679                         /* a rwnd report is in here */
4680                         if (bottle_bw > on_queue)
4681                                 a_rwnd = bottle_bw - on_queue;
4682                         else
4683                                 a_rwnd = 0;
4684
4685                         if (a_rwnd == 0)
4686                                 stcb->asoc.peers_rwnd = 0;
4687                         else {
4688                                 if (a_rwnd > stcb->asoc.total_flight) {
4689                                         stcb->asoc.peers_rwnd =
4690                                             a_rwnd - stcb->asoc.total_flight;
4691                                 } else {
4692                                         stcb->asoc.peers_rwnd = 0;
4693                                 }
4694                                 if (stcb->asoc.peers_rwnd <
4695                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4696                                         /* SWS sender side engages */
4697                                         stcb->asoc.peers_rwnd = 0;
4698                                 }
4699                         }
4700                 }
4701         } else {
4702                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4703         }
4704
4705         /* now middle boxes in sat networks get a cwnd bump */
4706         if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
4707             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4708             (stcb->asoc.sat_network)) {
4709                 /*
4710                  * This is debatable but for sat networks it makes sense
4711                  * Note if a T3 timer has went off, we will prohibit any
4712                  * changes to cwnd until we exit the t3 loss recovery.
4713                  */
4714                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4715                         net, cp, &bottle_bw, &on_queue);
4716         }
4717 }
4718
4719 /*
4720  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4721  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4722  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4723  * length of the complete packet outputs: - length: modified to remaining
4724  * length after control processing - netp: modified to new sctp_nets after
4725  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4726  * bad packet,...) otherwise return the tcb for this packet
4727  */
4728 #ifdef __GNUC__
4729 __attribute__ ((noinline))
4730 #endif
4731 static struct sctp_tcb *
4732 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4733     struct sockaddr *src, struct sockaddr *dst,
4734     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4735     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4736 #if defined(__FreeBSD__) && !defined(__Userspace__)
4737     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4738 #endif
4739     uint32_t vrf_id, uint16_t port)
4740 {
4741         struct sctp_association *asoc;
4742         struct mbuf *op_err;
4743         char msg[SCTP_DIAG_INFO_LEN];
4744         uint32_t vtag_in;
4745         int num_chunks = 0;     /* number of control chunks processed */
4746         uint32_t chk_length, contiguous;
4747         int ret;
4748         int abort_no_unlock = 0;
4749         int ecne_seen = 0;
4750         /*
4751          * How big should this be, and should it be alloc'd? Lets try the
4752          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4753          * until we get into jumbo grams and such..
4754          */
4755         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4756         int got_auth = 0;
4757         uint32_t auth_offset = 0, auth_len = 0;
4758         int auth_skipped = 0;
4759         int asconf_cnt = 0;
4760 #if defined(__APPLE__) && !defined(__Userspace__)
4761         struct socket *so;
4762 #endif
4763
4764         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4765                 iphlen, *offset, length, (void *)stcb);
4766
4767         if (stcb) {
4768                 SCTP_TCB_LOCK_ASSERT(stcb);
4769         }
4770         /* validate chunk header length... */
4771         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4772                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4773                         ntohs(ch->chunk_length));
4774                 *offset = length;
4775                 return (stcb);
4776         }
4777         /*
4778          * validate the verification tag
4779          */
4780         vtag_in = ntohl(sh->v_tag);
4781
4782         if (ch->chunk_type == SCTP_INITIATION) {
4783                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4784                         ntohs(ch->chunk_length), vtag_in);
4785                 if (vtag_in != 0) {
4786                         /* protocol error- silently discard... */
4787                         SCTP_STAT_INCR(sctps_badvtag);
4788                         if (stcb != NULL) {
4789                                 SCTP_TCB_UNLOCK(stcb);
4790                         }
4791                         return (NULL);
4792                 }
4793         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4794                 /*
4795                  * If there is no stcb, skip the AUTH chunk and process
4796                  * later after a stcb is found (to validate the lookup was
4797                  * valid.
4798                  */
4799                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4800                     (stcb == NULL) &&
4801                     (inp->auth_supported == 1)) {
4802                         /* save this chunk for later processing */
4803                         auth_skipped = 1;
4804                         auth_offset = *offset;
4805                         auth_len = ntohs(ch->chunk_length);
4806
4807                         /* (temporarily) move past this chunk */
4808                         *offset += SCTP_SIZE32(auth_len);
4809                         if (*offset >= length) {
4810                                 /* no more data left in the mbuf chain */
4811                                 *offset = length;
4812                                 return (NULL);
4813                         }
4814                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4815                                                                    sizeof(struct sctp_chunkhdr), chunk_buf);
4816                 }
4817                 if (ch == NULL) {
4818                         /* Help */
4819                         *offset = length;
4820                         return (stcb);
4821                 }
4822                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4823                         goto process_control_chunks;
4824                 }
4825                 /*
4826                  * first check if it's an ASCONF with an unknown src addr we
4827                  * need to look inside to find the association
4828                  */
4829                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4830                         struct sctp_chunkhdr *asconf_ch = ch;
4831                         uint32_t asconf_offset = 0, asconf_len = 0;
4832
4833                         /* inp's refcount may be reduced */
4834                         SCTP_INP_INCR_REF(inp);
4835
4836                         asconf_offset = *offset;
4837                         do {
4838                                 asconf_len = ntohs(asconf_ch->chunk_length);
4839                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4840                                         break;
4841                                 stcb = sctp_findassociation_ep_asconf(m,
4842                                                                       *offset,
4843                                                                       dst,
4844                                                                       sh, &inp, netp, vrf_id);
4845                                 if (stcb != NULL)
4846                                         break;
4847                                 asconf_offset += SCTP_SIZE32(asconf_len);
4848                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4849                                                                                   sizeof(struct sctp_chunkhdr), chunk_buf);
4850                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4851                         if (stcb == NULL) {
4852                                 /*
4853                                  * reduce inp's refcount if not reduced in
4854                                  * sctp_findassociation_ep_asconf().
4855                                  */
4856                                 SCTP_INP_DECR_REF(inp);
4857                         }
4858
4859                         /* now go back and verify any auth chunk to be sure */
4860                         if (auth_skipped && (stcb != NULL)) {
4861                                 struct sctp_auth_chunk *auth;
4862
4863                                 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
4864                                         auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
4865                                         got_auth = 1;
4866                                         auth_skipped = 0;
4867                                 } else {
4868                                         auth = NULL;
4869                                 }
4870                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4871                                                                        auth_offset)) {
4872                                         /* auth HMAC failed so dump it */
4873                                         *offset = length;
4874                                         return (stcb);
4875                                 } else {
4876                                         /* remaining chunks are HMAC checked */
4877                                         stcb->asoc.authenticated = 1;
4878                                 }
4879                         }
4880                 }
4881                 if (stcb == NULL) {
4882                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4883                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4884                                                      msg);
4885                         /* no association, so it's out of the blue... */
4886                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4887 #if defined(__FreeBSD__) && !defined(__Userspace__)
4888                                          mflowtype, mflowid, inp->fibnum,
4889 #endif
4890                                          vrf_id, port);
4891                         *offset = length;
4892                         return (NULL);
4893                 }
4894                 asoc = &stcb->asoc;
4895                 /* ABORT and SHUTDOWN can use either v_tag... */
4896                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4897                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4898                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4899                         /* Take the T-bit always into account. */
4900                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4901                              (vtag_in == asoc->my_vtag)) ||
4902                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4903                              (asoc->peer_vtag != htonl(0)) &&
4904                              (vtag_in == asoc->peer_vtag))) {
4905                                 /* this is valid */
4906                         } else {
4907                                 /* drop this packet... */
4908                                 SCTP_STAT_INCR(sctps_badvtag);
4909                                 if (stcb != NULL) {
4910                                         SCTP_TCB_UNLOCK(stcb);
4911                                 }
4912                                 return (NULL);
4913                         }
4914                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4915                         if (vtag_in != asoc->my_vtag) {
4916                                 /*
4917                                  * this could be a stale SHUTDOWN-ACK or the
4918                                  * peer never got the SHUTDOWN-COMPLETE and
4919                                  * is still hung; we have started a new asoc
4920                                  * but it won't complete until the shutdown
4921                                  * is completed
4922                                  */
4923                                 if (stcb != NULL) {
4924                                         SCTP_TCB_UNLOCK(stcb);
4925                                 }
4926                                 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4927                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4928                                                              msg);
4929                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4930                                                  sh, inp, op_err,
4931 #if defined(__FreeBSD__) && !defined(__Userspace__)
4932                                                  mflowtype, mflowid, fibnum,
4933 #endif
4934                                                  vrf_id, port);
4935                                 return (NULL);
4936                         }
4937                 } else {
4938                         /* for all other chunks, vtag must match */
4939                         if (vtag_in != asoc->my_vtag) {
4940                                 /* invalid vtag... */
4941                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4942                                         "invalid vtag: %xh, expect %xh\n",
4943                                         vtag_in, asoc->my_vtag);
4944                                 SCTP_STAT_INCR(sctps_badvtag);
4945                                 if (stcb != NULL) {
4946                                         SCTP_TCB_UNLOCK(stcb);
4947                                 }
4948                                 *offset = length;
4949                                 return (NULL);
4950                         }
4951                 }
4952         }                       /* end if !SCTP_COOKIE_ECHO */
4953         /*
4954          * process all control chunks...
4955          */
4956         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4957              (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4958              (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4959             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4960                 /* implied cookie-ack.. we must have lost the ack */
4961                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4962                                        *netp);
4963         }
4964
4965  process_control_chunks:
4966         while (IS_SCTP_CONTROL(ch)) {
4967                 /* validate chunk length */
4968                 chk_length = ntohs(ch->chunk_length);
4969                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4970                         ch->chunk_type, chk_length);
4971                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4972                 if (chk_length < sizeof(*ch) ||
4973                     (*offset + (int)chk_length) > length) {
4974                         *offset = length;
4975                         return (stcb);
4976                 }
4977                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4978                 /*
4979                  * INIT and INIT-ACK only gets the init ack "header" portion
4980                  * only because we don't have to process the peer's COOKIE.
4981                  * All others get a complete chunk.
4982                  */
4983                 switch (ch->chunk_type) {
4984                 case SCTP_INITIATION:
4985                         contiguous = sizeof(struct sctp_init_chunk);
4986                         break;
4987                 case SCTP_INITIATION_ACK:
4988                         contiguous = sizeof(struct sctp_init_ack_chunk);
4989                         break;
4990                 default:
4991                         contiguous = min(chk_length, sizeof(chunk_buf));
4992                         break;
4993                 }
4994                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4995                                                            contiguous,
4996                                                            chunk_buf);
4997                 if (ch == NULL) {
4998                         *offset = length;
4999                         if (stcb != NULL) {
5000                                 SCTP_TCB_UNLOCK(stcb);
5001                         }
5002                         return (NULL);
5003                 }
5004
5005                 num_chunks++;
5006                 /* Save off the last place we got a control from */
5007                 if (stcb != NULL) {
5008                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
5009                                 /*
5010                                  * allow last_control to be NULL if
5011                                  * ASCONF... ASCONF processing will find the
5012                                  * right net later
5013                                  */
5014                                 if ((netp != NULL) && (*netp != NULL))
5015                                         stcb->asoc.last_control_chunk_from = *netp;
5016                         }
5017                 }
5018 #ifdef SCTP_AUDITING_ENABLED
5019                 sctp_audit_log(0xB0, ch->chunk_type);
5020 #endif
5021
5022                 /* check to see if this chunk required auth, but isn't */
5023                 if ((stcb != NULL) &&
5024                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
5025                     !stcb->asoc.authenticated) {
5026                         /* "silently" ignore */
5027                         SCTP_STAT_INCR(sctps_recvauthmissing);
5028                         goto next_chunk;
5029                 }
5030                 switch (ch->chunk_type) {
5031                 case SCTP_INITIATION:
5032                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
5033                         /* The INIT chunk must be the only chunk. */
5034                         if ((num_chunks > 1) ||
5035                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5036                                 /* RFC 4960 requires that no ABORT is sent */
5037                                 *offset = length;
5038                                 if (stcb != NULL) {
5039                                         SCTP_TCB_UNLOCK(stcb);
5040                                 }
5041                                 return (NULL);
5042                         }
5043                         /* Honor our resource limit. */
5044                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
5045                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5046                                 sctp_abort_association(inp, stcb, m, iphlen,
5047                                                        src, dst, sh, op_err,
5048 #if defined(__FreeBSD__) && !defined(__Userspace__)
5049                                                        mflowtype, mflowid,
5050 #endif
5051                                                        vrf_id, port);
5052                                 *offset = length;
5053                                 return (NULL);
5054                         }
5055                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
5056                                          (struct sctp_init_chunk *)ch, inp,
5057                                          stcb, *netp, &abort_no_unlock,
5058 #if defined(__FreeBSD__) && !defined(__Userspace__)
5059                                          mflowtype, mflowid,
5060 #endif
5061                                          vrf_id, port);
5062                         *offset = length;
5063                         if ((!abort_no_unlock) && (stcb != NULL)) {
5064                                 SCTP_TCB_UNLOCK(stcb);
5065                         }
5066                         return (NULL);
5067                         break;
5068                 case SCTP_PAD_CHUNK:
5069                         break;
5070                 case SCTP_INITIATION_ACK:
5071                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
5072                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5073                                 /* We are not interested anymore */
5074                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
5075                                         ;
5076                                 } else {
5077                                         *offset = length;
5078                                         if (stcb != NULL) {
5079 #if defined(__APPLE__) && !defined(__Userspace__)
5080                                                 so = SCTP_INP_SO(inp);
5081                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
5082                                                 SCTP_TCB_UNLOCK(stcb);
5083                                                 SCTP_SOCKET_LOCK(so, 1);
5084                                                 SCTP_TCB_LOCK(stcb);
5085                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
5086 #endif
5087                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5088                                                                       SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
5089 #if defined(__APPLE__) && !defined(__Userspace__)
5090                                                 SCTP_SOCKET_UNLOCK(so, 1);
5091 #endif
5092                                         }
5093                                         return (NULL);
5094                                 }
5095                         }
5096                         /* The INIT-ACK chunk must be the only chunk. */
5097                         if ((num_chunks > 1) ||
5098                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5099                                 *offset = length;
5100                                 return (stcb);
5101                         }
5102                         if ((netp != NULL) && (*netp != NULL)) {
5103                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
5104                                                            src, dst, sh,
5105                                                            (struct sctp_init_ack_chunk *)ch,
5106                                                            stcb, *netp,
5107                                                            &abort_no_unlock,
5108 #if defined(__FreeBSD__) && !defined(__Userspace__)
5109                                                            mflowtype, mflowid,
5110 #endif
5111                                                            vrf_id);
5112                         } else {
5113                                 ret = -1;
5114                         }
5115                         *offset = length;
5116                         if (abort_no_unlock) {
5117                                 return (NULL);
5118                         }
5119                         /*
5120                          * Special case, I must call the output routine to
5121                          * get the cookie echoed
5122                          */
5123                         if ((stcb != NULL) && (ret == 0)) {
5124                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5125                         }
5126                         return (stcb);
5127                         break;
5128                 case SCTP_SELECTIVE_ACK:
5129                 case SCTP_NR_SELECTIVE_ACK:
5130                 {
5131                         int abort_now = 0;
5132                         uint32_t a_rwnd, cum_ack;
5133                         uint16_t num_seg, num_nr_seg, num_dup;
5134                         uint8_t flags;
5135                         int offset_seg, offset_dup;
5136
5137                         SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5138                                 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
5139                         SCTP_STAT_INCR(sctps_recvsacks);
5140                         if (stcb == NULL) {
5141                                 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
5142                                         (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
5143                                 break;
5144                         }
5145                         if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
5146                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
5147                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
5148                                         break;
5149                                 }
5150                         } else {
5151                                 if (stcb->asoc.nrsack_supported == 0) {
5152                                         goto unknown_chunk;
5153                                 }
5154                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5155                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
5156                                         break;
5157                                 }
5158                         }
5159                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5160                                 /*-
5161                                  * If we have sent a shutdown-ack, we will pay no
5162                                  * attention to a sack sent in to us since
5163                                  * we don't care anymore.
5164                                  */
5165                                 break;
5166                         }
5167                         flags = ch->chunk_flags;
5168                         if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
5169                                 struct sctp_sack_chunk *sack;
5170
5171                                 sack = (struct sctp_sack_chunk *)ch;
5172                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
5173                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
5174                                 num_nr_seg = 0;
5175                                 num_dup = ntohs(sack->sack.num_dup_tsns);
5176                                 a_rwnd = ntohl(sack->sack.a_rwnd);
5177                                 if (sizeof(struct sctp_sack_chunk) +
5178                                     num_seg * sizeof(struct sctp_gap_ack_block) +
5179                                     num_dup * sizeof(uint32_t) != chk_length) {
5180                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
5181                                         break;
5182                                 }
5183                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
5184                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5185                         } else {
5186                                 struct sctp_nr_sack_chunk *nr_sack;
5187
5188                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5189                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5190                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5191                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5192                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5193                                 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
5194                                 if (sizeof(struct sctp_nr_sack_chunk) +
5195                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5196                                     num_dup * sizeof(uint32_t) != chk_length) {
5197                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5198                                         break;
5199                                 }
5200                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5201                                 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
5202                         }
5203                         SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5204                                 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
5205                                 cum_ack, num_seg, a_rwnd);
5206                         stcb->asoc.seen_a_sack_this_pkt = 1;
5207                         if ((stcb->asoc.pr_sctp_cnt == 0) &&
5208                             (num_seg == 0) && (num_nr_seg == 0) &&
5209                             SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5210                             (stcb->asoc.saw_sack_with_frags == 0) &&
5211                             (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5212                             (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5213                                 /*
5214                                  * We have a SIMPLE sack having no
5215                                  * prior segments and data on sent
5216                                  * queue to be acked. Use the
5217                                  * faster path sack processing. We
5218                                  * also allow window update sacks
5219                                  * with no missing segments to go
5220                                  * this way too.
5221                                  */
5222                                 sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5223                                                          &abort_now, ecne_seen);
5224                         } else {
5225                                 if ((netp != NULL) && (*netp != NULL)) {
5226                                         sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5227                                                          num_seg, num_nr_seg, num_dup, &abort_now, flags,
5228                                                          cum_ack, a_rwnd, ecne_seen);
5229                                 }
5230                         }
5231                         if (abort_now) {
5232                                 /* ABORT signal from sack processing */
5233                                 *offset = length;
5234                                 return (NULL);
5235                         }
5236                         if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5237                             TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5238                             (stcb->asoc.stream_queue_cnt == 0)) {
5239                                 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb,  0, NULL, SCTP_SO_NOT_LOCKED);
5240                         }
5241                         break;
5242                 }
5243                 case SCTP_HEARTBEAT_REQUEST:
5244                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5245                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5246                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5247                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5248                                                         chk_length, *netp);
5249                         }
5250                         break;
5251                 case SCTP_HEARTBEAT_ACK:
5252                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
5253                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5254                                 /* Its not ours */
5255                                 *offset = length;
5256                                 return (stcb);
5257                         }
5258                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5259                         if ((netp != NULL) && (*netp != NULL)) {
5260                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5261                                                           stcb, *netp);
5262                         }
5263                         break;
5264                 case SCTP_ABORT_ASSOCIATION:
5265                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5266                                 (void *)stcb);
5267                         *offset = length;
5268                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5269                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
5270                                         return (NULL);
5271                                 } else {
5272                                         return (stcb);
5273                                 }
5274                         } else {
5275                                 return (NULL);
5276                         }
5277                         break;
5278                 case SCTP_SHUTDOWN:
5279                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5280                                 (void *)stcb);
5281                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5282                                 *offset = length;
5283                                 return (stcb);
5284                         }
5285                         if ((netp != NULL) && (*netp != NULL)) {
5286                                 int abort_flag = 0;
5287
5288                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5289                                                      stcb, *netp, &abort_flag);
5290                                 if (abort_flag) {
5291                                         *offset = length;
5292                                         return (NULL);
5293                                 }
5294                         }
5295                         break;
5296                 case SCTP_SHUTDOWN_ACK:
5297                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
5298                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5299                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5300                         }
5301                         *offset = length;
5302                         return (NULL);
5303                         break;
5304                 case SCTP_OPERATION_ERROR:
5305                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
5306                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
5307                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
5308                                 *offset = length;
5309                                 return (NULL);
5310                         }
5311                         break;
5312                 case SCTP_COOKIE_ECHO:
5313                         SCTPDBG(SCTP_DEBUG_INPUT3,
5314                                 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
5315                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
5316                                 ;
5317                         } else {
5318                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5319                                         /* We are not interested anymore */
5320                                 abend:
5321                                         if (stcb != NULL) {
5322                                                 SCTP_TCB_UNLOCK(stcb);
5323                                         }
5324                                         *offset = length;
5325                                         return (NULL);
5326                                 }
5327                         }
5328                         /*-
5329                          * First are we accepting? We do this again here
5330                          * since it is possible that a previous endpoint WAS
5331                          * listening responded to a INIT-ACK and then
5332                          * closed. We opened and bound.. and are now no
5333                          * longer listening.
5334                          *
5335                          * XXXGL: notes on checking listen queue length.
5336                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
5337                          *    SOLISTENING(), because a listening "UDP type"
5338                          *    socket isn't listening in terms of the socket
5339                          *    layer.  It is a normal data flow socket, that
5340                          *    can fork off new connections.  Thus, we should
5341                          *    look into sol_qlen only in case we are !UDP.
5342                          * 2) Checking sol_qlen in general requires locking
5343                          *    the socket, and this code lacks that.
5344                          */
5345                         if ((stcb == NULL) &&
5346                             (!SCTP_IS_LISTENING(inp) ||
5347                              (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
5348 #if defined(__FreeBSD__) && !defined(__Userspace__)
5349                               inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
5350 #else
5351                               inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit))) {
5352 #endif
5353                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5354                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5355                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5356                                         sctp_abort_association(inp, stcb, m, iphlen,
5357                                                                src, dst, sh, op_err,
5358 #if defined(__FreeBSD__) && !defined(__Userspace__)
5359                                                                mflowtype, mflowid,
5360 #endif
5361                                                                vrf_id, port);
5362                                 }
5363                                 *offset = length;
5364                                 return (NULL);
5365                         } else {
5366                                 struct mbuf *ret_buf;
5367                                 struct sctp_inpcb *linp;
5368                                 struct sctp_tmit_chunk *chk;
5369
5370                                 if (stcb) {
5371                                         linp = NULL;
5372                                 } else {
5373                                         linp = inp;
5374                                 }
5375
5376                                 if (linp != NULL) {
5377                                         SCTP_ASOC_CREATE_LOCK(linp);
5378                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5379                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5380                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5381                                                 goto abend;
5382                                         }
5383                                 }
5384
5385                                 if (netp != NULL) {
5386                                         struct sctp_tcb *locked_stcb;
5387
5388                                         locked_stcb = stcb;
5389                                         ret_buf =
5390                                                 sctp_handle_cookie_echo(m, iphlen,
5391                                                                         *offset,
5392                                                                         src, dst,
5393                                                                         sh,
5394                                                                         (struct sctp_cookie_echo_chunk *)ch,
5395                                                                         &inp, &stcb, netp,
5396                                                                         auth_skipped,
5397                                                                         auth_offset,
5398                                                                         auth_len,
5399                                                                         &locked_stcb,
5400 #if defined(__FreeBSD__) && !defined(__Userspace__)
5401                                                                         mflowtype,
5402                                                                         mflowid,
5403 #endif
5404                                                                         vrf_id,
5405                                                                         port);
5406                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
5407                                                 SCTP_TCB_UNLOCK(locked_stcb);
5408                                         }
5409                                         if (stcb != NULL) {
5410                                                 SCTP_TCB_LOCK_ASSERT(stcb);
5411                                         }
5412                                 } else {
5413                                         ret_buf = NULL;
5414                                 }
5415                                 if (linp != NULL) {
5416                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5417                                 }
5418                                 if (ret_buf == NULL) {
5419                                         if (stcb != NULL) {
5420                                                 SCTP_TCB_UNLOCK(stcb);
5421                                         }
5422                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5423                                                 "GAK, null buffer\n");
5424                                         *offset = length;
5425                                         return (NULL);
5426                                 }
5427                                 /* if AUTH skipped, see if it verified... */
5428                                 if (auth_skipped) {
5429                                         got_auth = 1;
5430                                         auth_skipped = 0;
5431                                 }
5432                                 /* Restart the timer if we have pending data */
5433                                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
5434                                         if (chk->whoTo != NULL) {
5435                                                 break;
5436                                         }
5437                                 }
5438                                 if (chk != NULL) {
5439                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5440                                 }
5441                         }
5442                         break;
5443                 case SCTP_COOKIE_ACK:
5444                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
5445                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5446                                 return (stcb);
5447                         }
5448                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5449                                 /* We are not interested anymore */
5450                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5451                                         ;
5452                                 } else if (stcb) {
5453 #if defined(__APPLE__) && !defined(__Userspace__)
5454                                         so = SCTP_INP_SO(inp);
5455                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5456                                         SCTP_TCB_UNLOCK(stcb);
5457                                         SCTP_SOCKET_LOCK(so, 1);
5458                                         SCTP_TCB_LOCK(stcb);
5459                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5460 #endif
5461                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5462                                                               SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5463 #if defined(__APPLE__) && !defined(__Userspace__)
5464                                         SCTP_SOCKET_UNLOCK(so, 1);
5465 #endif
5466                                         *offset = length;
5467                                         return (NULL);
5468                                 }
5469                         }
5470                         if ((netp != NULL) && (*netp != NULL)) {
5471                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5472                         }
5473                         break;
5474                 case SCTP_ECN_ECHO:
5475                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5476                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5477                                 /* Its not ours */
5478                                 *offset = length;
5479                                 return (stcb);
5480                         }
5481                         if (stcb->asoc.ecn_supported == 0) {
5482                                 goto unknown_chunk;
5483                         }
5484                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5485                         ecne_seen = 1;
5486                         break;
5487                 case SCTP_ECN_CWR:
5488                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5489                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5490                                 *offset = length;
5491                                 return (stcb);
5492                         }
5493                         if (stcb->asoc.ecn_supported == 0) {
5494                                 goto unknown_chunk;
5495                         }
5496                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5497                         break;
5498                 case SCTP_SHUTDOWN_COMPLETE:
5499                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5500                         /* must be first and only chunk */
5501                         if ((num_chunks > 1) ||
5502                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5503                                 *offset = length;
5504                                 return (stcb);
5505                         }
5506                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5507                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5508                                                               stcb, *netp);
5509                         }
5510                         *offset = length;
5511                         return (NULL);
5512                         break;
5513                 case SCTP_ASCONF:
5514                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5515                         if (stcb != NULL) {
5516                                 if (stcb->asoc.asconf_supported == 0) {
5517                                         goto unknown_chunk;
5518                                 }
5519                                 sctp_handle_asconf(m, *offset, src,
5520                                                    (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5521                                 asconf_cnt++;
5522                         }
5523                         break;
5524                 case SCTP_ASCONF_ACK:
5525                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5526                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5527                                 /* Its not ours */
5528                                 *offset = length;
5529                                 return (stcb);
5530                         }
5531                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5532                                 if (stcb->asoc.asconf_supported == 0) {
5533                                         goto unknown_chunk;
5534                                 }
5535                                 /* He's alive so give him credit */
5536                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5537                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5538                                                        stcb->asoc.overall_error_count,
5539                                                        0,
5540                                                        SCTP_FROM_SCTP_INPUT,
5541                                                        __LINE__);
5542                                 }
5543                                 stcb->asoc.overall_error_count = 0;
5544                                 sctp_handle_asconf_ack(m, *offset,
5545                                                        (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5546                                 if (abort_no_unlock)
5547                                         return (NULL);
5548                         }
5549                         break;
5550                 case SCTP_FORWARD_CUM_TSN:
5551                 case SCTP_IFORWARD_CUM_TSN:
5552                         SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
5553                                 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
5554                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5555                                 /* Its not ours */
5556                                 *offset = length;
5557                                 return (stcb);
5558                         }
5559
5560                         if (stcb != NULL) {
5561                                 int abort_flag = 0;
5562
5563                                 if (stcb->asoc.prsctp_supported == 0) {
5564                                         goto unknown_chunk;
5565                                 }
5566                                 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
5567                                     ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
5568                                         if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
5569                                                 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
5570                                         } else {
5571                                                 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
5572                                         }
5573                                         op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
5574                                         sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
5575                                         *offset = length;
5576                                         return (NULL);
5577                                 }
5578                                 *fwd_tsn_seen = 1;
5579                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5580                                         /* We are not interested anymore */
5581 #if defined(__APPLE__) && !defined(__Userspace__)
5582                                         so = SCTP_INP_SO(inp);
5583                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5584                                         SCTP_TCB_UNLOCK(stcb);
5585                                         SCTP_SOCKET_LOCK(so, 1);
5586                                         SCTP_TCB_LOCK(stcb);
5587                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5588 #endif
5589                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5590                                                               SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5591 #if defined(__APPLE__) && !defined(__Userspace__)
5592                                         SCTP_SOCKET_UNLOCK(so, 1);
5593 #endif
5594                                         *offset = length;
5595                                         return (NULL);
5596                                 }
5597                                 /*
5598                                  * For sending a SACK this looks like DATA
5599                                  * chunks.
5600                                  */
5601                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5602                                 sctp_handle_forward_tsn(stcb,
5603                                                         (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5604                                 if (abort_flag) {
5605                                         *offset = length;
5606                                         return (NULL);
5607                                 }
5608                         }
5609                         break;
5610                 case SCTP_STREAM_RESET:
5611                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5612                         if ((stcb == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req))) {
5613                                 /* Its not ours */
5614                                 *offset = length;
5615                                 return (stcb);
5616                         }
5617                         if (stcb->asoc.reconfig_supported == 0) {
5618                                 goto unknown_chunk;
5619                         }
5620                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5621                                 /* stop processing */
5622                                 *offset = length;
5623                                 return (NULL);
5624                         }
5625                         break;
5626                 case SCTP_PACKET_DROPPED:
5627                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5628                         /* re-get it all please */
5629                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5630                                 /* Its not ours */
5631                                 *offset = length;
5632                                 return (stcb);
5633                         }
5634
5635                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5636                                 if (stcb->asoc.pktdrop_supported == 0) {
5637                                         goto unknown_chunk;
5638                                 }
5639                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5640                                                            stcb, *netp,
5641                                                            min(chk_length, contiguous));
5642                         }
5643                         break;
5644                 case SCTP_AUTHENTICATION:
5645                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5646                         if (stcb == NULL) {
5647                                 /* save the first AUTH for later processing */
5648                                 if (auth_skipped == 0) {
5649                                         auth_offset = *offset;
5650                                         auth_len = chk_length;
5651                                         auth_skipped = 1;
5652                                 }
5653                                 /* skip this chunk (temporarily) */
5654                                 goto next_chunk;
5655                         }
5656                         if (stcb->asoc.auth_supported == 0) {
5657                                 goto unknown_chunk;
5658                         }
5659                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5660                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5661                                            SCTP_AUTH_DIGEST_LEN_MAX))) {
5662                                 /* Its not ours */
5663                                 *offset = length;
5664                                 return (stcb);
5665                         }
5666                         if (got_auth == 1) {
5667                                 /* skip this chunk... it's already auth'd */
5668                                 goto next_chunk;
5669                         }
5670                         got_auth = 1;
5671                         if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
5672                                 /* auth HMAC failed so dump the packet */
5673                                 *offset = length;
5674                                 return (stcb);
5675                         } else {
5676                                 /* remaining chunks are HMAC checked */
5677                                 stcb->asoc.authenticated = 1;
5678                         }
5679                         break;
5680
5681                 default:
5682                 unknown_chunk:
5683                         /* it's an unknown chunk! */
5684                         if ((ch->chunk_type & 0x40) &&
5685                             (stcb != NULL) &&
5686                             (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
5687                             (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
5688                             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
5689                                 struct sctp_gen_error_cause *cause;
5690                                 int len;
5691
5692                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5693                                                                0, M_NOWAIT, 1, MT_DATA);
5694                                 if (op_err != NULL) {
5695                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5696                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5697                                         cause->code =  htons(SCTP_CAUSE_UNRECOG_CHUNK);
5698                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5699                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5700                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5701                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5702 #ifdef SCTP_MBUF_LOGGING
5703                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5704                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5705                                                 }
5706 #endif
5707                                                 sctp_queue_op_err(stcb, op_err);
5708                                         } else {
5709                                                 sctp_m_freem(op_err);
5710                                         }
5711                                 }
5712                         }
5713                         if ((ch->chunk_type & 0x80) == 0) {
5714                                 /* discard this packet */
5715                                 *offset = length;
5716                                 return (stcb);
5717                         }       /* else skip this bad chunk and continue... */
5718                         break;
5719                 }               /* switch (ch->chunk_type) */
5720
5721
5722         next_chunk:
5723                 /* get the next chunk */
5724                 *offset += SCTP_SIZE32(chk_length);
5725                 if (*offset >= length) {
5726                         /* no more data left in the mbuf chain */
5727                         break;
5728                 }
5729                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5730                                                            sizeof(struct sctp_chunkhdr), chunk_buf);
5731                 if (ch == NULL) {
5732                         *offset = length;
5733                         return (stcb);
5734                 }
5735         }                       /* while */
5736
5737         if ((asconf_cnt > 0) && (stcb != NULL)) {
5738                 sctp_send_asconf_ack(stcb);
5739         }
5740         return (stcb);
5741 }
5742
5743
5744 /*
5745  * common input chunk processing (v4 and v6)
5746  */
5747 void
5748 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5749                              struct sockaddr *src, struct sockaddr *dst,
5750                              struct sctphdr *sh, struct sctp_chunkhdr *ch,
5751                              uint8_t compute_crc,
5752                              uint8_t ecn_bits,
5753 #if defined(__FreeBSD__) && !defined(__Userspace__)
5754                              uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5755 #endif
5756                              uint32_t vrf_id, uint16_t port)
5757 {
5758         uint32_t high_tsn;
5759         int fwd_tsn_seen = 0, data_processed = 0;
5760         struct mbuf *m = *mm, *op_err;
5761         char msg[SCTP_DIAG_INFO_LEN];
5762         int un_sent;
5763         int cnt_ctrl_ready = 0;
5764         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5765         struct sctp_tcb *stcb = NULL;
5766         struct sctp_nets *net = NULL;
5767 #if defined(__Userspace__)
5768         struct socket *upcall_socket = NULL;
5769 #endif
5770
5771         SCTP_STAT_INCR(sctps_recvdatagrams);
5772 #ifdef SCTP_AUDITING_ENABLED
5773         sctp_audit_log(0xE0, 1);
5774         sctp_auditing(0, inp, stcb, net);
5775 #endif
5776         if (compute_crc != 0) {
5777                 uint32_t check, calc_check;
5778
5779                 check = sh->checksum;
5780                 sh->checksum = 0;
5781                 calc_check = sctp_calculate_cksum(m, iphlen);
5782                 sh->checksum = check;
5783                 if (calc_check != check) {
5784                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5785                                 calc_check, check, (void *)m, length, iphlen);
5786                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5787                                                          sh, ch, &inp, &net, vrf_id);
5788 #if defined(INET) || defined(INET6)
5789                         if ((ch->chunk_type != SCTP_INITIATION) &&
5790                             (net != NULL) && (net->port != port)) {
5791                                 if (net->port == 0) {
5792                                         /* UDP encapsulation turned on. */
5793                                         net->mtu -= sizeof(struct udphdr);
5794                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5795                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5796                                         }
5797                                 } else if (port == 0) {
5798                                         /* UDP encapsulation turned off. */
5799                                         net->mtu += sizeof(struct udphdr);
5800                                         /* XXX Update smallest_mtu */
5801                                 }
5802                                 net->port = port;
5803                         }
5804 #endif
5805 #if defined(__FreeBSD__) && !defined(__Userspace__)
5806                         if (net != NULL) {
5807                                 net->flowtype = mflowtype;
5808                                 net->flowid = mflowid;
5809                         }
5810                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5811 #endif
5812                         if ((inp != NULL) && (stcb != NULL)) {
5813                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5814                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5815                         } else if ((inp != NULL) && (stcb == NULL)) {
5816                                 inp_decr = inp;
5817                         }
5818                         SCTP_STAT_INCR(sctps_badsum);
5819                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5820                         goto out;
5821                 }
5822         }
5823         /* Destination port of 0 is illegal, based on RFC4960. */
5824         if (sh->dest_port == 0) {
5825                 SCTP_STAT_INCR(sctps_hdrops);
5826                 goto out;
5827         }
5828         stcb = sctp_findassociation_addr(m, offset, src, dst,
5829                                          sh, ch, &inp, &net, vrf_id);
5830 #if defined(INET) || defined(INET6)
5831         if ((ch->chunk_type != SCTP_INITIATION) &&
5832             (net != NULL) && (net->port != port)) {
5833                 if (net->port == 0) {
5834                         /* UDP encapsulation turned on. */
5835                         net->mtu -= sizeof(struct udphdr);
5836                         if (stcb->asoc.smallest_mtu > net->mtu) {
5837                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5838                         }
5839                 } else if (port == 0) {
5840                         /* UDP encapsulation turned off. */
5841                         net->mtu += sizeof(struct udphdr);
5842                         /* XXX Update smallest_mtu */
5843                 }
5844                 net->port = port;
5845         }
5846 #endif
5847 #if defined(__FreeBSD__) && !defined(__Userspace__)
5848         if (net != NULL) {
5849                 net->flowtype = mflowtype;
5850                 net->flowid = mflowid;
5851         }
5852 #endif
5853         if (inp == NULL) {
5854 #if defined(__FreeBSD__) && !defined(__Userspace__)
5855                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5856 #endif
5857                 SCTP_STAT_INCR(sctps_noport);
5858 #if defined(__FreeBSD__) && !defined(__Userspace__)
5859                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5860                         goto out;
5861                 }
5862 #endif
5863                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5864                         sctp_send_shutdown_complete2(src, dst, sh,
5865 #if defined(__FreeBSD__) && !defined(__Userspace__)
5866                                                      mflowtype, mflowid, fibnum,
5867 #endif
5868                                                      vrf_id, port);
5869                         goto out;
5870                 }
5871                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5872                         goto out;
5873                 }
5874                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5875                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5876                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5877                              (ch->chunk_type != SCTP_INIT))) {
5878                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5879                                                              "Out of the blue");
5880                                 sctp_send_abort(m, iphlen, src, dst,
5881                                                 sh, 0, op_err,
5882 #if defined(__FreeBSD__) && !defined(__Userspace__)
5883                                                 mflowtype, mflowid, fibnum,
5884 #endif
5885                                                 vrf_id, port);
5886                         }
5887                 }
5888                 goto out;
5889         } else if (stcb == NULL) {
5890                 inp_decr = inp;
5891         }
5892         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5893                 (void *)m, iphlen, offset, length, (void *)stcb);
5894         if (stcb) {
5895                 /* always clear this before beginning a packet */
5896                 stcb->asoc.authenticated = 0;
5897                 stcb->asoc.seen_a_sack_this_pkt = 0;
5898                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5899                         (void *)stcb, stcb->asoc.state);
5900
5901                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5902                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5903                         /*-
5904                          * If we hit here, we had a ref count
5905                          * up when the assoc was aborted and the
5906                          * timer is clearing out the assoc, we should
5907                          * NOT respond to any packet.. its OOTB.
5908                          */
5909                         SCTP_TCB_UNLOCK(stcb);
5910                         stcb = NULL;
5911 #if defined(__FreeBSD__) && !defined(__Userspace__)
5912                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5913 #endif
5914                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5915                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5916                                                      msg);
5917                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5918 #if defined(__FreeBSD__) && !defined(__Userspace__)
5919                                          mflowtype, mflowid, inp->fibnum,
5920 #endif
5921                                          vrf_id, port);
5922                         goto out;
5923                 }
5924         }
5925 #if defined(__Userspace__)
5926         if ((stcb != NULL) &&
5927             !(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) &&
5928             (stcb->sctp_socket != NULL)) {
5929                 if (stcb->sctp_socket->so_head != NULL) {
5930                         upcall_socket = stcb->sctp_socket->so_head;
5931                 } else {
5932                         upcall_socket = stcb->sctp_socket;
5933                 }
5934                 SOCK_LOCK(upcall_socket);
5935                 soref(upcall_socket);
5936                 SOCK_UNLOCK(upcall_socket);
5937         }
5938 #endif
5939         if (IS_SCTP_CONTROL(ch)) {
5940                 /* process the control portion of the SCTP packet */
5941                 /* sa_ignore NO_NULL_CHK */
5942                 stcb = sctp_process_control(m, iphlen, &offset, length,
5943                                             src, dst, sh, ch,
5944                                             inp, stcb, &net, &fwd_tsn_seen,
5945 #if defined(__FreeBSD__) && !defined(__Userspace__)
5946                                             mflowtype, mflowid, fibnum,
5947 #endif
5948                                             vrf_id, port);
5949                 if (stcb) {
5950                         /* This covers us if the cookie-echo was there
5951                          * and it changes our INP.
5952                          */
5953                         inp = stcb->sctp_ep;
5954 #if defined(INET) || defined(INET6)
5955                         if ((ch->chunk_type != SCTP_INITIATION) &&
5956                             (net != NULL) && (net->port != port)) {
5957                                 if (net->port == 0) {
5958                                         /* UDP encapsulation turned on. */
5959                                         net->mtu -= sizeof(struct udphdr);
5960                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5961                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5962                                         }
5963                                 } else if (port == 0) {
5964                                         /* UDP encapsulation turned off. */
5965                                         net->mtu += sizeof(struct udphdr);
5966                                         /* XXX Update smallest_mtu */
5967                                 }
5968                                 net->port = port;
5969                         }
5970 #endif
5971                 }
5972         } else {
5973                 /*
5974                  * no control chunks, so pre-process DATA chunks (these
5975                  * checks are taken care of by control processing)
5976                  */
5977
5978                 /*
5979                  * if DATA only packet, and auth is required, then punt...
5980                  * can't have authenticated without any AUTH (control)
5981                  * chunks
5982                  */
5983                 if ((stcb != NULL) &&
5984                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5985                         /* "silently" ignore */
5986 #if defined(__FreeBSD__) && !defined(__Userspace__)
5987                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5988 #endif
5989                         SCTP_STAT_INCR(sctps_recvauthmissing);
5990                         goto out;
5991                 }
5992                 if (stcb == NULL) {
5993                         /* out of the blue DATA chunk */
5994 #if defined(__FreeBSD__) && !defined(__Userspace__)
5995                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5996 #endif
5997                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5998                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5999                                                      msg);
6000                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
6001 #if defined(__FreeBSD__) && !defined(__Userspace__)
6002                                          mflowtype, mflowid, fibnum,
6003 #endif
6004                                          vrf_id, port);
6005                         goto out;
6006                 }
6007                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
6008                         /* v_tag mismatch! */
6009 #if defined(__FreeBSD__) && !defined(__Userspace__)
6010                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
6011 #endif
6012                         SCTP_STAT_INCR(sctps_badvtag);
6013                         goto out;
6014                 }
6015         }
6016
6017 #if defined(__FreeBSD__) && !defined(__Userspace__)
6018         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
6019 #endif
6020         if (stcb == NULL) {
6021                 /*
6022                  * no valid TCB for this packet, or we found it's a bad
6023                  * packet while processing control, or we're done with this
6024                  * packet (done or skip rest of data), so we drop it...
6025                  */
6026                 goto out;
6027         }
6028 #if defined(__Userspace__)
6029         if ((upcall_socket == NULL) &&
6030             !(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) &&
6031             (stcb->sctp_socket != NULL)) {
6032                 if (stcb->sctp_socket->so_head != NULL) {
6033                         upcall_socket = stcb->sctp_socket->so_head;
6034                 } else {
6035                         upcall_socket = stcb->sctp_socket;
6036                 }
6037                 SOCK_LOCK(upcall_socket);
6038                 soref(upcall_socket);
6039                 SOCK_UNLOCK(upcall_socket);
6040         }
6041 #endif
6042
6043         /*
6044          * DATA chunk processing
6045          */
6046         /* plow through the data chunks while length > offset */
6047
6048         /*
6049          * Rest should be DATA only.  Check authentication state if AUTH for
6050          * DATA is required.
6051          */
6052         if ((length > offset) &&
6053             (stcb != NULL) &&
6054             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
6055             !stcb->asoc.authenticated) {
6056                 /* "silently" ignore */
6057                 SCTP_STAT_INCR(sctps_recvauthmissing);
6058                 SCTPDBG(SCTP_DEBUG_AUTH1,
6059                         "Data chunk requires AUTH, skipped\n");
6060                 goto trigger_send;
6061         }
6062         if (length > offset) {
6063                 int retval;
6064
6065                 /*
6066                  * First check to make sure our state is correct. We would
6067                  * not get here unless we really did have a tag, so we don't
6068                  * abort if this happens, just dump the chunk silently.
6069                  */
6070                 switch (SCTP_GET_STATE(stcb)) {
6071                 case SCTP_STATE_COOKIE_ECHOED:
6072                         /*
6073                          * we consider data with valid tags in this state
6074                          * shows us the cookie-ack was lost. Imply it was
6075                          * there.
6076                          */
6077                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
6078                         break;
6079                 case SCTP_STATE_COOKIE_WAIT:
6080                         /*
6081                          * We consider OOTB any data sent during asoc setup.
6082                          */
6083                         SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
6084                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
6085                                                      msg);
6086                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
6087 #if defined(__FreeBSD__) && !defined(__Userspace__)
6088                                          mflowtype, mflowid, inp->fibnum,
6089 #endif
6090                                          vrf_id, port);
6091                         goto out;
6092                         /*sa_ignore NOTREACHED*/
6093                         break;
6094                 case SCTP_STATE_EMPTY:  /* should not happen */
6095                 case SCTP_STATE_INUSE:  /* should not happen */
6096                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
6097                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
6098                 default:
6099                         goto out;
6100                         /*sa_ignore NOTREACHED*/
6101                         break;
6102                 case SCTP_STATE_OPEN:
6103                 case SCTP_STATE_SHUTDOWN_SENT:
6104                         break;
6105                 }
6106                 /* plow through the data chunks while length > offset */
6107                 retval = sctp_process_data(mm, iphlen, &offset, length,
6108                                            inp, stcb, net, &high_tsn);
6109                 if (retval == 2) {
6110                         /*
6111                          * The association aborted, NO UNLOCK needed since
6112                          * the association is destroyed.
6113                          */
6114                         stcb = NULL;
6115                         goto out;
6116                 }
6117                 data_processed = 1;
6118                 /*
6119                  * Anything important needs to have been m_copy'ed in
6120                  * process_data
6121                  */
6122         }
6123
6124         /* take care of ecn */
6125         if ((data_processed == 1) &&
6126             (stcb->asoc.ecn_supported == 1) &&
6127             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
6128                 /* Yep, we need to add a ECNE */
6129                 sctp_send_ecn_echo(stcb, net, high_tsn);
6130         }
6131
6132         if ((data_processed == 0) && (fwd_tsn_seen)) {
6133                 int was_a_gap;
6134                 uint32_t highest_tsn;
6135
6136                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
6137                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
6138                 } else {
6139                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
6140                 }
6141                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
6142                 stcb->asoc.send_sack = 1;
6143                 sctp_sack_check(stcb, was_a_gap);
6144         } else if (fwd_tsn_seen) {
6145                 stcb->asoc.send_sack = 1;
6146         }
6147         /* trigger send of any chunks in queue... */
6148 trigger_send:
6149 #ifdef SCTP_AUDITING_ENABLED
6150         sctp_audit_log(0xE0, 2);
6151         sctp_auditing(1, inp, stcb, net);
6152 #endif
6153         SCTPDBG(SCTP_DEBUG_INPUT1,
6154                 "Check for chunk output prw:%d tqe:%d tf=%d\n",
6155                 stcb->asoc.peers_rwnd,
6156                 TAILQ_EMPTY(&stcb->asoc.control_send_queue),
6157                 stcb->asoc.total_flight);
6158         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
6159         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
6160                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
6161         }
6162         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
6163             cnt_ctrl_ready ||
6164             stcb->asoc.trigger_reset ||
6165             ((un_sent > 0) &&
6166              (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
6167                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
6168                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
6169                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6170         }
6171 #ifdef SCTP_AUDITING_ENABLED
6172         sctp_audit_log(0xE0, 3);
6173         sctp_auditing(2, inp, stcb, net);
6174 #endif
6175  out:
6176         if (stcb != NULL) {
6177                 SCTP_TCB_UNLOCK(stcb);
6178         }
6179 #if defined(__Userspace__)
6180         if (upcall_socket != NULL) {
6181                 if (upcall_socket->so_upcall != NULL) {
6182                         if (soreadable(upcall_socket) ||
6183                             sowriteable(upcall_socket) ||
6184                             upcall_socket->so_error) {
6185                                 (*upcall_socket->so_upcall)(upcall_socket, upcall_socket->so_upcallarg, M_NOWAIT);
6186                         }
6187                 }
6188                 ACCEPT_LOCK();
6189                 SOCK_LOCK(upcall_socket);
6190                 sorele(upcall_socket);
6191         }
6192 #endif
6193         if (inp_decr != NULL) {
6194                 /* reduce ref-count */
6195                 SCTP_INP_WLOCK(inp_decr);
6196                 SCTP_INP_DECR_REF(inp_decr);
6197                 SCTP_INP_WUNLOCK(inp_decr);
6198         }
6199         return;
6200 }
6201
6202 #ifdef INET
6203 #if !defined(__Userspace__)
6204 void
6205 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6206 {
6207         struct mbuf *m;
6208         int iphlen;
6209         uint32_t vrf_id = 0;
6210         uint8_t ecn_bits;
6211         struct sockaddr_in src, dst;
6212         struct ip *ip;
6213         struct sctphdr *sh;
6214         struct sctp_chunkhdr *ch;
6215         int length, offset;
6216         uint8_t compute_crc;
6217 #if defined(__FreeBSD__) && !defined(__Userspace__)
6218         uint32_t mflowid;
6219         uint8_t mflowtype;
6220         uint16_t fibnum;
6221 #endif
6222 #if defined(__Userspace__)
6223         uint16_t port = 0;
6224 #endif
6225
6226         iphlen = off;
6227         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6228                 SCTP_RELEASE_PKT(i_pak);
6229                 return;
6230         }
6231         m = SCTP_HEADER_TO_CHAIN(i_pak);
6232 #ifdef SCTP_MBUF_LOGGING
6233         /* Log in any input mbufs */
6234         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6235                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6236         }
6237 #endif
6238 #ifdef SCTP_PACKET_LOGGING
6239         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6240                 sctp_packet_log(m);
6241         }
6242 #endif
6243 #if defined(__FreeBSD__) && !defined(__Userspace__)
6244         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6245                 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6246                 m->m_pkthdr.len,
6247                 if_name(m->m_pkthdr.rcvif),
6248                 (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6249 #endif
6250 #if defined(__APPLE__) && !defined(__Userspace__)
6251         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6252                 "sctp_input(): Packet of length %d received on %s%d with csum_flags 0x%x.\n",
6253                 m->m_pkthdr.len,
6254                 m->m_pkthdr.rcvif->if_name,
6255                 m->m_pkthdr.rcvif->if_unit,
6256                 m->m_pkthdr.csum_flags);
6257 #endif
6258 #if defined(_WIN32) && !defined(__Userspace__)
6259         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6260                 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
6261                 m->m_pkthdr.len,
6262                 m->m_pkthdr.rcvif->if_xname,
6263                 m->m_pkthdr.csum_flags);
6264 #endif
6265 #if defined(__FreeBSD__) && !defined(__Userspace__)
6266         mflowid = m->m_pkthdr.flowid;
6267         mflowtype = M_HASHTYPE_GET(m);
6268         fibnum = M_GETFIB(m);
6269 #endif
6270         SCTP_STAT_INCR(sctps_recvpackets);
6271         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6272         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6273         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6274         if (SCTP_BUF_LEN(m) < offset) {
6275                 if ((m = m_pullup(m, offset)) == NULL) {
6276                         SCTP_STAT_INCR(sctps_hdrops);
6277                         return;
6278                 }
6279         }
6280         ip = mtod(m, struct ip *);
6281         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6282         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6283         offset -= sizeof(struct sctp_chunkhdr);
6284         memset(&src, 0, sizeof(struct sockaddr_in));
6285         src.sin_family = AF_INET;
6286 #ifdef HAVE_SIN_LEN
6287         src.sin_len = sizeof(struct sockaddr_in);
6288 #endif
6289         src.sin_port = sh->src_port;
6290         src.sin_addr = ip->ip_src;
6291         memset(&dst, 0, sizeof(struct sockaddr_in));
6292         dst.sin_family = AF_INET;
6293 #ifdef HAVE_SIN_LEN
6294         dst.sin_len = sizeof(struct sockaddr_in);
6295 #endif
6296         dst.sin_port = sh->dest_port;
6297         dst.sin_addr = ip->ip_dst;
6298 #if defined(_WIN32) && !defined(__Userspace__)
6299         NTOHS(ip->ip_len);
6300 #endif
6301 #if defined(__linux__) || (defined(_WIN32) && defined(__Userspace__))
6302         ip->ip_len = ntohs(ip->ip_len);
6303 #endif
6304 #if defined(__Userspace__)
6305 #if defined(__linux__) || defined(_WIN32)
6306         length = ip->ip_len;
6307 #else
6308         length = ip->ip_len + iphlen;
6309 #endif
6310 #elif defined(__FreeBSD__)
6311         length = ntohs(ip->ip_len);
6312 #elif defined(__APPLE__)
6313         length = ip->ip_len + iphlen;
6314 #else
6315         length = ip->ip_len;
6316 #endif
6317         /* Validate mbuf chain length with IP payload length. */
6318         if (SCTP_HEADER_LEN(m) != length) {
6319                 SCTPDBG(SCTP_DEBUG_INPUT1,
6320                         "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6321                 SCTP_STAT_INCR(sctps_hdrops);
6322                 goto out;
6323         }
6324         /* SCTP does not allow broadcasts or multicasts */
6325         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6326                 goto out;
6327         }
6328         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6329                 goto out;
6330         }
6331         ecn_bits = ip->ip_tos;
6332 #if defined(__FreeBSD__) && !defined(__Userspace__)
6333         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6334                 SCTP_STAT_INCR(sctps_recvhwcrc);
6335                 compute_crc = 0;
6336         } else {
6337 #else
6338         if (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
6339             ((src.sin_addr.s_addr == dst.sin_addr.s_addr) ||
6340              (SCTP_IS_IT_LOOPBACK(m)))) {
6341                 SCTP_STAT_INCR(sctps_recvhwcrc);
6342                 compute_crc = 0;
6343         } else {
6344 #endif
6345                 SCTP_STAT_INCR(sctps_recvswcrc);
6346                 compute_crc = 1;
6347         }
6348         sctp_common_input_processing(&m, iphlen, offset, length,
6349                                      (struct sockaddr *)&src,
6350                                      (struct sockaddr *)&dst,
6351                                      sh, ch,
6352                                      compute_crc,
6353                                      ecn_bits,
6354 #if defined(__FreeBSD__) && !defined(__Userspace__)
6355                                      mflowtype, mflowid, fibnum,
6356 #endif
6357                                      vrf_id, port);
6358  out:
6359         if (m) {
6360                 sctp_m_freem(m);
6361         }
6362         return;
6363 }
6364
6365 #if defined(__FreeBSD__) && !defined(__Userspace__)
6366 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
6367 extern int *sctp_cpuarry;
6368 #endif
6369 #endif
6370
6371 #if defined(__FreeBSD__) && !defined(__Userspace__)
6372 int
6373 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6374 {
6375         struct mbuf *m;
6376         int off;
6377
6378         m = *mp;
6379         off = *offp;
6380 #else
6381 void
6382 sctp_input(struct mbuf *m, int off)
6383 {
6384 #endif
6385 #if defined(__FreeBSD__) && !defined(__Userspace__)
6386 #if defined(SCTP_MCORE_INPUT) && defined(SMP)
6387         if (mp_ncpus > 1) {
6388                 struct ip *ip;
6389                 struct sctphdr *sh;
6390                 int offset;
6391                 int cpu_to_use;
6392                 uint32_t flowid, tag;
6393
6394                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6395                         flowid = m->m_pkthdr.flowid;
6396                 } else {
6397                         /* No flow id built by lower layers
6398                          * fix it so we create one.
6399                          */
6400                         offset = off + sizeof(struct sctphdr);
6401                         if (SCTP_BUF_LEN(m) < offset) {
6402                                 if ((m = m_pullup(m, offset)) == NULL) {
6403                                         SCTP_STAT_INCR(sctps_hdrops);
6404                                         return (IPPROTO_DONE);
6405                                 }
6406                         }
6407                         ip = mtod(m, struct ip *);
6408                         sh = (struct sctphdr *)((caddr_t)ip + off);
6409                         tag = htonl(sh->v_tag);
6410                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6411                         m->m_pkthdr.flowid = flowid;
6412                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
6413                 }
6414                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6415                 sctp_queue_to_mcore(m, off, cpu_to_use);
6416                 return (IPPROTO_DONE);
6417         }
6418 #endif
6419 #endif
6420         sctp_input_with_port(m, off, 0);
6421 #if defined(__FreeBSD__) && !defined(__Userspace__)
6422         return (IPPROTO_DONE);
6423 #endif
6424 }
6425 #endif
6426 #endif