sys/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 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <netinet/sctp_os.h>
  39 #include <netinet/sctp_var.h>
  40 #include <netinet/sctp_sysctl.h>
  41 #include <netinet/sctp_pcb.h>
  42 #include <netinet/sctp_header.h>
  43 #include <netinet/sctputil.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_input.h>
  46 #include <netinet/sctp_auth.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctp_bsd_addr.h>
  50 #include <netinet/sctp_timer.h>
  51 #include <netinet/sctp_crc32.h>
  52 #if defined(INET) || defined(INET6)
  53 #include <netinet/udp.h>
  54 #endif
  55 #include <netinet/in_kdtrace.h>
  56 #include <sys/smp.h>
  57
  58
  59
  60 static void
  61 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  62 {
  63         struct sctp_nets *net;
  64
  65         /*
  66          * This now not only stops all cookie timers it also stops any INIT
  67          * timers as well. This will make sure that the timers are stopped
  68          * in all collision cases.
  69          */
  70         SCTP_TCB_LOCK_ASSERT(stcb);
  71         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  72                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  73                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  74                             stcb->sctp_ep,
  75                             stcb,
  76                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  77                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  78                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  79                             stcb->sctp_ep,
  80                             stcb,
  81                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  82                 }
  83         }
  84 }
  85
  86 /* INIT handler */
  87 static void
  88 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  89     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  90     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  91     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  92     uint8_t mflowtype, uint32_t mflowid,
  93     uint32_t vrf_id, uint16_t port)
  94 {
  95         struct sctp_init *init;
  96         struct mbuf *op_err;
  97
  98         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  99             (void *)stcb);
 100         if (stcb == NULL) {
 101                 SCTP_INP_RLOCK(inp);
 102         }
 103         /* validate length */
 104         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 105                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 106                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 107                     mflowtype, mflowid,
 108                     vrf_id, port);
 109                 if (stcb)
 110                         *abort_no_unlock = 1;
 111                 goto outnow;
 112         }
 113         /* validate parameters */
 114         init = &cp->init;
 115         if (init->initiate_tag == 0) {
 116                 /* protocol error... send abort */
 117                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 118                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 119                     mflowtype, mflowid,
 120                     vrf_id, port);
 121                 if (stcb)
 122                         *abort_no_unlock = 1;
 123                 goto outnow;
 124         }
 125         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 126                 /* invalid parameter... 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                     mflowtype, mflowid,
 130                     vrf_id, port);
 131                 if (stcb)
 132                         *abort_no_unlock = 1;
 133                 goto outnow;
 134         }
 135         if (init->num_inbound_streams == 0) {
 136                 /* protocol error... send abort */
 137                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 138                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 139                     mflowtype, mflowid,
 140                     vrf_id, port);
 141                 if (stcb)
 142                         *abort_no_unlock = 1;
 143                 goto outnow;
 144         }
 145         if (init->num_outbound_streams == 0) {
 146                 /* protocol error... send abort */
 147                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 148                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 149                     mflowtype, mflowid,
 150                     vrf_id, port);
 151                 if (stcb)
 152                         *abort_no_unlock = 1;
 153                 goto outnow;
 154         }
 155         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 156             offset + ntohs(cp->ch.chunk_length))) {
 157                 /* auth parameter(s) error... send abort */
 158                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 159                     "Problem with AUTH parameters");
 160                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 161                     mflowtype, mflowid,
 162                     vrf_id, port);
 163                 if (stcb)
 164                         *abort_no_unlock = 1;
 165                 goto outnow;
 166         }
 167         /* We are only accepting if we have a listening socket. */
 168         if ((stcb == NULL) &&
 169             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 170             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 171             (!SCTP_IS_LISTENING(inp)))) {
 172                 /*
 173                  * FIX ME ?? What about TCP model and we have a
 174                  * match/restart case? Actually no fix is needed. the lookup
 175                  * will always find the existing assoc so stcb would not be
 176                  * NULL. It may be questionable to do this since we COULD
 177                  * just send back the INIT-ACK and hope that the app did
 178                  * accept()'s by the time the COOKIE was sent. But there is
 179                  * a price to pay for COOKIE generation and I don't want to
 180                  * pay it on the chance that the app will actually do some
 181                  * accepts(). The App just looses and should NOT be in this
 182                  * state :-)
 183                  */
 184                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 185                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 186                             "No listener");
 187                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 188                             mflowtype, mflowid, inp->fibnum,
 189                             vrf_id, port);
 190                 }
 191                 goto outnow;
 192         }
 193         if ((stcb != NULL) &&
 194             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 195                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 196                 sctp_send_shutdown_ack(stcb, NULL);
 197                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 198         } else {
 199                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 200                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 201                     src, dst, sh, cp,
 202                     mflowtype, mflowid,
 203                     vrf_id, port);
 204         }
 205 outnow:
 206         if (stcb == NULL) {
 207                 SCTP_INP_RUNLOCK(inp);
 208         }
 209 }
 210
 211 /*
 212  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 213  */
 214
 215 int
 216 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 217 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 218     SCTP_UNUSED
 219 #endif
 220 )
 221 {
 222         int unsent_data;
 223         unsigned int i;
 224         struct sctp_stream_queue_pending *sp;
 225         struct sctp_association *asoc;
 226
 227         /*
 228          * This function returns if any stream has true unsent data on it.
 229          * Note that as it looks through it will clean up any places that
 230          * have old data that has been sent but left at top of stream queue.
 231          */
 232         asoc = &stcb->asoc;
 233         unsent_data = 0;
 234         SCTP_TCB_SEND_LOCK(stcb);
 235         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 236                 /* Check to see if some data queued */
 237                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 238                         /* sa_ignore FREED_MEMORY */
 239                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 240                         if (sp == NULL) {
 241                                 continue;
 242                         }
 243                         if ((sp->msg_is_complete) &&
 244                             (sp->length == 0) &&
 245                             (sp->sender_all_done)) {
 246                                 /*
 247                                  * We are doing differed cleanup. Last time
 248                                  * through when we took all the data the
 249                                  * sender_all_done was not set.
 250                                  */
 251                                 if (sp->put_last_out == 0) {
 252                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 253                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 254                                             sp->sender_all_done,
 255                                             sp->length,
 256                                             sp->msg_is_complete,
 257                                             sp->put_last_out);
 258                                 }
 259                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 260                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 261                                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
 262                                 if (sp->net) {
 263                                         sctp_free_remote_addr(sp->net);
 264                                         sp->net = NULL;
 265                                 }
 266                                 if (sp->data) {
 267                                         sctp_m_freem(sp->data);
 268                                         sp->data = NULL;
 269                                 }
 270                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 271                                 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
 272                                         unsent_data++;
 273                                 }
 274                         } else {
 275                                 unsent_data++;
 276                         }
 277                         if (unsent_data > 0) {
 278                                 break;
 279                         }
 280                 }
 281         }
 282         SCTP_TCB_SEND_UNLOCK(stcb);
 283         return (unsent_data);
 284 }
 285
 286 static int
 287 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 288 {
 289         struct sctp_init *init;
 290         struct sctp_association *asoc;
 291         struct sctp_nets *lnet;
 292         unsigned int i;
 293
 294         init = &cp->init;
 295         asoc = &stcb->asoc;
 296         /* save off parameters */
 297         asoc->peer_vtag = ntohl(init->initiate_tag);
 298         asoc->peers_rwnd = ntohl(init->a_rwnd);
 299         /* init tsn's */
 300         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 301
 302         if (!TAILQ_EMPTY(&asoc->nets)) {
 303                 /* update any ssthresh's that may have a default */
 304                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 305                         lnet->ssthresh = asoc->peers_rwnd;
 306                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 307                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 308                         }
 309
 310                 }
 311         }
 312         SCTP_TCB_SEND_LOCK(stcb);
 313         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 314                 unsigned int newcnt;
 315                 struct sctp_stream_out *outs;
 316                 struct sctp_stream_queue_pending *sp, *nsp;
 317                 struct sctp_tmit_chunk *chk, *nchk;
 318
 319                 /* abandon the upper streams */
 320                 newcnt = ntohs(init->num_inbound_streams);
 321                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 322                         if (chk->rec.data.sid >= newcnt) {
 323                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 324                                 asoc->send_queue_cnt--;
 325                                 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
 326                                         asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
 327 #ifdef INVARIANTS
 328                                 } else {
 329                                         panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
 330 #endif
 331                                 }
 332                                 if (chk->data != NULL) {
 333                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 334                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 335                                             0, chk, SCTP_SO_NOT_LOCKED);
 336                                         if (chk->data) {
 337                                                 sctp_m_freem(chk->data);
 338                                                 chk->data = NULL;
 339                                         }
 340                                 }
 341                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 342                                 /* sa_ignore FREED_MEMORY */
 343                         }
 344                 }
 345                 if (asoc->strmout) {
 346                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 347                                 outs = &asoc->strmout[i];
 348                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 349                                         atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 350                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 351                                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
 352                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 353                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 354                                         if (sp->data) {
 355                                                 sctp_m_freem(sp->data);
 356                                                 sp->data = NULL;
 357                                         }
 358                                         if (sp->net) {
 359                                                 sctp_free_remote_addr(sp->net);
 360                                                 sp->net = NULL;
 361                                         }
 362                                         /* Free the chunk */
 363                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 364                                         /* sa_ignore FREED_MEMORY */
 365                                 }
 366                                 outs->state = SCTP_STREAM_CLOSED;
 367                         }
 368                 }
 369                 /* cut back the count */
 370                 asoc->pre_open_streams = newcnt;
 371         }
 372         SCTP_TCB_SEND_UNLOCK(stcb);
 373         asoc->streamoutcnt = asoc->pre_open_streams;
 374         if (asoc->strmout) {
 375                 for (i = 0; i < asoc->streamoutcnt; i++) {
 376                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 377                 }
 378         }
 379         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 380         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 381         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 382                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 383         }
 384         /* This is the next one we expect */
 385         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 386
 387         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 388         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 389
 390         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 391         /* open the requested streams */
 392
 393         if (asoc->strmin != NULL) {
 394                 /* Free the old ones */
 395                 for (i = 0; i < asoc->streamincnt; i++) {
 396                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 397                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 398                 }
 399                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 400         }
 401         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 402                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 403         } else {
 404                 asoc->streamincnt = asoc->max_inbound_streams;
 405         }
 406         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 407             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 408         if (asoc->strmin == NULL) {
 409                 /* we didn't get memory for the streams! */
 410                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 411                 return (-1);
 412         }
 413         for (i = 0; i < asoc->streamincnt; i++) {
 414                 asoc->strmin[i].sid = i;
 415                 asoc->strmin[i].last_mid_delivered = 0xffffffff;
 416                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 417                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 418                 asoc->strmin[i].pd_api_started = 0;
 419                 asoc->strmin[i].delivery_started = 0;
 420         }
 421         /*
 422          * load_address_from_init will put the addresses into the
 423          * association when the COOKIE is processed or the INIT-ACK is
 424          * processed. Both types of COOKIE's existing and new call this
 425          * routine. It will remove addresses that are no longer in the
 426          * association (for the restarting case where addresses are
 427          * removed). Up front when the INIT arrives we will discard it if it
 428          * is a restart and new addresses have been added.
 429          */
 430         /* sa_ignore MEMLEAK */
 431         return (0);
 432 }
 433
 434 /*
 435  * INIT-ACK message processing/consumption returns value < 0 on error
 436  */
 437 static int
 438 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 439     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 440     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 441     struct sctp_nets *net, int *abort_no_unlock,
 442     uint8_t mflowtype, uint32_t mflowid,
 443     uint32_t vrf_id)
 444 {
 445         struct sctp_association *asoc;
 446         struct mbuf *op_err;
 447         int retval, abort_flag, cookie_found;
 448         int initack_limit;
 449         int nat_friendly = 0;
 450
 451         /* First verify that we have no illegal param's */
 452         abort_flag = 0;
 453         cookie_found = 0;
 454
 455         op_err = sctp_arethere_unrecognized_parameters(m,
 456             (offset + sizeof(struct sctp_init_chunk)),
 457             &abort_flag, (struct sctp_chunkhdr *)cp,
 458             &nat_friendly, &cookie_found);
 459         if (abort_flag) {
 460                 /* Send an abort and notify peer */
 461                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 462                 *abort_no_unlock = 1;
 463                 return (-1);
 464         }
 465         if (!cookie_found) {
 466                 uint16_t len;
 467
 468                 /* Only report the missing cookie parameter */
 469                 if (op_err != NULL) {
 470                         sctp_m_freem(op_err);
 471                 }
 472                 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 473                 /* We abort with an error of missing mandatory param */
 474                 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 475                 if (op_err != NULL) {
 476                         struct sctp_error_missing_param *cause;
 477
 478                         SCTP_BUF_LEN(op_err) = len;
 479                         cause = mtod(op_err, struct sctp_error_missing_param *);
 480                         /* Subtract the reserved param */
 481                         cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 482                         cause->cause.length = htons(len);
 483                         cause->num_missing_params = htonl(1);
 484                         cause->type[0] = htons(SCTP_STATE_COOKIE);
 485                 }
 486                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 487                     src, dst, sh, op_err,
 488                     mflowtype, mflowid,
 489                     vrf_id, net->port);
 490                 *abort_no_unlock = 1;
 491                 return (-3);
 492         }
 493         asoc = &stcb->asoc;
 494         asoc->peer_supports_nat = (uint8_t)nat_friendly;
 495         /* process the peer's parameters in the INIT-ACK */
 496         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 497         if (retval < 0) {
 498                 return (retval);
 499         }
 500         initack_limit = offset + ntohs(cp->ch.chunk_length);
 501         /* load all addresses */
 502         if ((retval = sctp_load_addresses_from_init(stcb, m,
 503             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 504             src, dst, NULL, stcb->asoc.port))) {
 505                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 506                     "Problem with address parameters");
 507                 SCTPDBG(SCTP_DEBUG_INPUT1,
 508                     "Load addresses from INIT causes an abort %d\n",
 509                     retval);
 510                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 511                     src, dst, sh, op_err,
 512                     mflowtype, mflowid,
 513                     vrf_id, net->port);
 514                 *abort_no_unlock = 1;
 515                 return (-1);
 516         }
 517         /* if the peer doesn't support asconf, flush the asconf queue */
 518         if (asoc->asconf_supported == 0) {
 519                 struct sctp_asconf_addr *param, *nparam;
 520
 521                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 522                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 523                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 524                 }
 525         }
 526
 527         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 528             stcb->asoc.local_hmacs);
 529         if (op_err) {
 530                 sctp_queue_op_err(stcb, op_err);
 531                 /* queuing will steal away the mbuf chain to the out queue */
 532                 op_err = NULL;
 533         }
 534         /* extract the cookie and queue it to "echo" it back... */
 535         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 536                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 537                     stcb->asoc.overall_error_count,
 538                     0,
 539                     SCTP_FROM_SCTP_INPUT,
 540                     __LINE__);
 541         }
 542         stcb->asoc.overall_error_count = 0;
 543         net->error_count = 0;
 544
 545         /*
 546          * Cancel the INIT timer, We do this first before queueing the
 547          * cookie. We always cancel at the primary to assue that we are
 548          * canceling the timer started by the INIT which always goes to the
 549          * primary.
 550          */
 551         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 552             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 553
 554         /* calculate the RTO */
 555         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
 556             SCTP_RTT_FROM_NON_DATA);
 557         retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
 558         return (retval);
 559 }
 560
 561 static void
 562 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 563     struct sctp_tcb *stcb, struct sctp_nets *net)
 564 {
 565         union sctp_sockstore store;
 566         struct sctp_nets *r_net, *f_net;
 567         struct timeval tv;
 568         int req_prim = 0;
 569         uint16_t old_error_counter;
 570
 571         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 572                 /* Invalid length */
 573                 return;
 574         }
 575
 576         memset(&store, 0, sizeof(store));
 577         switch (cp->heartbeat.hb_info.addr_family) {
 578 #ifdef INET
 579         case AF_INET:
 580                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 581                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 582                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 583                         store.sin.sin_port = stcb->rport;
 584                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 585                             sizeof(store.sin.sin_addr));
 586                 } else {
 587                         return;
 588                 }
 589                 break;
 590 #endif
 591 #ifdef INET6
 592         case AF_INET6:
 593                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 594                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 595                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 596                         store.sin6.sin6_port = stcb->rport;
 597                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 598                 } else {
 599                         return;
 600                 }
 601                 break;
 602 #endif
 603         default:
 604                 return;
 605         }
 606         r_net = sctp_findnet(stcb, &store.sa);
 607         if (r_net == NULL) {
 608                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 609                 return;
 610         }
 611         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 612             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 613             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 614                 /*
 615                  * If the its a HB and it's random value is correct when can
 616                  * confirm the destination.
 617                  */
 618                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 619                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 620                         stcb->asoc.primary_destination = r_net;
 621                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 622                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 623                         if (f_net != r_net) {
 624                                 /*
 625                                  * first one on the list is NOT the primary
 626                                  * sctp_cmpaddr() is much more efficient if
 627                                  * the primary is the first on the list,
 628                                  * make it so.
 629                                  */
 630                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 631                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 632                         }
 633                         req_prim = 1;
 634                 }
 635                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 636                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 637                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 638                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 639                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 640         }
 641         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 642                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 643                     stcb->asoc.overall_error_count,
 644                     0,
 645                     SCTP_FROM_SCTP_INPUT,
 646                     __LINE__);
 647         }
 648         stcb->asoc.overall_error_count = 0;
 649         old_error_counter = r_net->error_count;
 650         r_net->error_count = 0;
 651         r_net->hb_responded = 1;
 652         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 653         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 654         /* Now lets do a RTO with this */
 655         sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
 656             SCTP_RTT_FROM_NON_DATA);
 657         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 658                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 659                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 660                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 661         }
 662         if (r_net->dest_state & SCTP_ADDR_PF) {
 663                 r_net->dest_state &= ~SCTP_ADDR_PF;
 664                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 665         }
 666         if (old_error_counter > 0) {
 667                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 668                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 669                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 670         }
 671         if (r_net == stcb->asoc.primary_destination) {
 672                 if (stcb->asoc.alternate) {
 673                         /* release the alternate, primary is good */
 674                         sctp_free_remote_addr(stcb->asoc.alternate);
 675                         stcb->asoc.alternate = NULL;
 676                 }
 677         }
 678         /* Mobility adaptation */
 679         if (req_prim) {
 680                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 681                     SCTP_MOBILITY_BASE) ||
 682                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 683                     SCTP_MOBILITY_FASTHANDOFF)) &&
 684                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 685                     SCTP_MOBILITY_PRIM_DELETED)) {
 686
 687                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 688                             stcb->sctp_ep, stcb, NULL,
 689                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 690                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 691                             SCTP_MOBILITY_FASTHANDOFF)) {
 692                                 sctp_assoc_immediate_retrans(stcb,
 693                                     stcb->asoc.primary_destination);
 694                         }
 695                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 696                             SCTP_MOBILITY_BASE)) {
 697                                 sctp_move_chunks_from_net(stcb,
 698                                     stcb->asoc.deleted_primary);
 699                         }
 700                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 701                             stcb->asoc.deleted_primary);
 702                 }
 703         }
 704 }
 705
 706 static int
 707 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 708 {
 709         /*
 710          * Return 0 means we want you to proceed with the abort non-zero
 711          * means no abort processing.
 712          */
 713         uint32_t new_vtag;
 714         struct sctpasochead *head;
 715
 716         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 717             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 718                 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 719                 atomic_add_int(&stcb->asoc.refcnt, 1);
 720                 SCTP_TCB_UNLOCK(stcb);
 721                 SCTP_INP_INFO_WLOCK();
 722                 SCTP_TCB_LOCK(stcb);
 723                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 724         } else {
 725                 return (0);
 726         }
 727         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
 728                 /* generate a new vtag and send init */
 729                 LIST_REMOVE(stcb, sctp_asocs);
 730                 stcb->asoc.my_vtag = new_vtag;
 731                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 732                 /*
 733                  * put it in the bucket in the vtag hash of assoc's for the
 734                  * system
 735                  */
 736                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 737                 SCTP_INP_INFO_WUNLOCK();
 738                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 739                 return (1);
 740         } else {
 741                 /*
 742                  * treat like a case where the cookie expired i.e.: - dump
 743                  * current cookie. - generate a new vtag. - resend init.
 744                  */
 745                 /* generate a new vtag and send init */
 746                 LIST_REMOVE(stcb, sctp_asocs);
 747                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 748                 sctp_stop_all_cookie_timers(stcb);
 749                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 750                 stcb->asoc.my_vtag = new_vtag;
 751                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 752                 /*
 753                  * put it in the bucket in the vtag hash of assoc's for the
 754                  * system
 755                  */
 756                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 757                 SCTP_INP_INFO_WUNLOCK();
 758                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 759                 return (1);
 760         }
 761         return (0);
 762 }
 763
 764 static int
 765 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 766     struct sctp_nets *net)
 767 {
 768         /*
 769          * return 0 means we want you to proceed with the abort non-zero
 770          * means no abort processing
 771          */
 772         if (stcb->asoc.auth_supported == 0) {
 773                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 774                 return (0);
 775         }
 776         sctp_asconf_send_nat_state_update(stcb, net);
 777         return (1);
 778 }
 779
 780
 781 /* Returns 1 if the stcb was aborted, 0 otherwise */
 782 static int
 783 sctp_handle_abort(struct sctp_abort_chunk *abort,
 784     struct sctp_tcb *stcb, struct sctp_nets *net)
 785 {
 786 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 787         struct socket *so;
 788 #endif
 789         uint16_t len;
 790         uint16_t error;
 791
 792         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 793         if (stcb == NULL)
 794                 return (0);
 795
 796         len = ntohs(abort->ch.chunk_length);
 797         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
 798                 /*
 799                  * Need to check the cause codes for our two magic nat
 800                  * aborts which don't kill the assoc necessarily.
 801                  */
 802                 struct sctp_error_cause *cause;
 803
 804                 cause = (struct sctp_error_cause *)(abort + 1);
 805                 error = ntohs(cause->code);
 806                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 807                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 808                             abort->ch.chunk_flags);
 809                         if (sctp_handle_nat_colliding_state(stcb)) {
 810                                 return (0);
 811                         }
 812                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 813                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 814                             abort->ch.chunk_flags);
 815                         if (sctp_handle_nat_missing_state(stcb, net)) {
 816                                 return (0);
 817                         }
 818                 }
 819         } else {
 820                 error = 0;
 821         }
 822         /* stop any receive timers */
 823         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 824             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 825         /* notify user of the abort and clean up... */
 826         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 827         /* free the tcb */
 828         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 829         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 830             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 831                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 832         }
 833 #ifdef SCTP_ASOCLOG_OF_TSNS
 834         sctp_print_out_track_log(stcb);
 835 #endif
 836 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 837         so = SCTP_INP_SO(stcb->sctp_ep);
 838         atomic_add_int(&stcb->asoc.refcnt, 1);
 839         SCTP_TCB_UNLOCK(stcb);
 840         SCTP_SOCKET_LOCK(so, 1);
 841         SCTP_TCB_LOCK(stcb);
 842         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 843 #endif
 844         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 845             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 846 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 847         SCTP_SOCKET_UNLOCK(so, 1);
 848 #endif
 849         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 850         return (1);
 851 }
 852
 853 static void
 854 sctp_start_net_timers(struct sctp_tcb *stcb)
 855 {
 856         uint32_t cnt_hb_sent;
 857         struct sctp_nets *net;
 858
 859         cnt_hb_sent = 0;
 860         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 861                 /*
 862                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 863                  * If the dest in unconfirmed send a hb as well if under
 864                  * max_hb_burst have been sent.
 865                  */
 866                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 867                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 868                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 869                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 870                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 871                         cnt_hb_sent++;
 872                 }
 873         }
 874         if (cnt_hb_sent) {
 875                 sctp_chunk_output(stcb->sctp_ep, stcb,
 876                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 877                     SCTP_SO_NOT_LOCKED);
 878         }
 879 }
 880
 881
 882 static void
 883 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 884     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 885 {
 886         struct sctp_association *asoc;
 887         int some_on_streamwheel;
 888         int old_state;
 889 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 890         struct socket *so;
 891 #endif
 892
 893         SCTPDBG(SCTP_DEBUG_INPUT2,
 894             "sctp_handle_shutdown: handling SHUTDOWN\n");
 895         if (stcb == NULL)
 896                 return;
 897         asoc = &stcb->asoc;
 898         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 899             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
 900                 return;
 901         }
 902         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 903                 /* Shutdown NOT the expected size */
 904                 return;
 905         }
 906         old_state = SCTP_GET_STATE(stcb);
 907         sctp_update_acked(stcb, cp, abort_flag);
 908         if (*abort_flag) {
 909                 return;
 910         }
 911         if (asoc->control_pdapi) {
 912                 /*
 913                  * With a normal shutdown we assume the end of last record.
 914                  */
 915                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 916                 if (asoc->control_pdapi->on_strm_q) {
 917                         struct sctp_stream_in *strm;
 918
 919                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 920                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 921                                 /* Unordered */
 922                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 923                                 asoc->control_pdapi->on_strm_q = 0;
 924                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 925                                 /* Ordered */
 926                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 927                                 asoc->control_pdapi->on_strm_q = 0;
 928 #ifdef INVARIANTS
 929                         } else {
 930                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 931                                     asoc->control_pdapi,
 932                                     asoc->control_pdapi->on_strm_q);
 933 #endif
 934                         }
 935                 }
 936                 asoc->control_pdapi->end_added = 1;
 937                 asoc->control_pdapi->pdapi_aborted = 1;
 938                 asoc->control_pdapi = NULL;
 939                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 940 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 941                 so = SCTP_INP_SO(stcb->sctp_ep);
 942                 atomic_add_int(&stcb->asoc.refcnt, 1);
 943                 SCTP_TCB_UNLOCK(stcb);
 944                 SCTP_SOCKET_LOCK(so, 1);
 945                 SCTP_TCB_LOCK(stcb);
 946                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 947                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 948                         /* assoc was freed while we were unlocked */
 949                         SCTP_SOCKET_UNLOCK(so, 1);
 950                         return;
 951                 }
 952 #endif
 953                 if (stcb->sctp_socket) {
 954                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 955                 }
 956 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 957                 SCTP_SOCKET_UNLOCK(so, 1);
 958 #endif
 959         }
 960         /* goto SHUTDOWN_RECEIVED state to block new requests */
 961         if (stcb->sctp_socket) {
 962                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 963                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 964                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
 965                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
 966                         /*
 967                          * notify upper layer that peer has initiated a
 968                          * shutdown
 969                          */
 970                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 971
 972                         /* reset time */
 973                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 974                 }
 975         }
 976         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
 977                 /*
 978                  * stop the shutdown timer, since we WILL move to
 979                  * SHUTDOWN-ACK-SENT.
 980                  */
 981                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 982                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 983         }
 984         /* Now is there unsent data on a stream somewhere? */
 985         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 986
 987         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 988             !TAILQ_EMPTY(&asoc->sent_queue) ||
 989             some_on_streamwheel) {
 990                 /* By returning we will push more data out */
 991                 return;
 992         } else {
 993                 /* no outstanding data to send, so move on... */
 994                 /* send SHUTDOWN-ACK */
 995                 /* move to SHUTDOWN-ACK-SENT state */
 996                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 997                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 998                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 999                 }
1000                 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
1001                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
1002                         sctp_stop_timers_for_shutdown(stcb);
1003                         sctp_send_shutdown_ack(stcb, net);
1004                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
1005                             stcb->sctp_ep, stcb, net);
1006                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1007                         sctp_send_shutdown_ack(stcb, net);
1008                 }
1009         }
1010 }
1011
1012 static void
1013 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
1014     struct sctp_tcb *stcb,
1015     struct sctp_nets *net)
1016 {
1017         struct sctp_association *asoc;
1018 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1019         struct socket *so;
1020
1021         so = SCTP_INP_SO(stcb->sctp_ep);
1022 #endif
1023         SCTPDBG(SCTP_DEBUG_INPUT2,
1024             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1025         if (stcb == NULL)
1026                 return;
1027
1028         asoc = &stcb->asoc;
1029         /* process according to association state */
1030         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1031             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1032                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1033                 sctp_send_shutdown_complete(stcb, net, 1);
1034                 SCTP_TCB_UNLOCK(stcb);
1035                 return;
1036         }
1037         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
1038             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1039                 /* unexpected SHUTDOWN-ACK... so ignore... */
1040                 SCTP_TCB_UNLOCK(stcb);
1041                 return;
1042         }
1043         if (asoc->control_pdapi) {
1044                 /*
1045                  * With a normal shutdown we assume the end of last record.
1046                  */
1047                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1048                 asoc->control_pdapi->end_added = 1;
1049                 asoc->control_pdapi->pdapi_aborted = 1;
1050                 asoc->control_pdapi = NULL;
1051                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1052 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1053                 atomic_add_int(&stcb->asoc.refcnt, 1);
1054                 SCTP_TCB_UNLOCK(stcb);
1055                 SCTP_SOCKET_LOCK(so, 1);
1056                 SCTP_TCB_LOCK(stcb);
1057                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1058                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1059                         /* assoc was freed while we were unlocked */
1060                         SCTP_SOCKET_UNLOCK(so, 1);
1061                         return;
1062                 }
1063 #endif
1064                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1065 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1066                 SCTP_SOCKET_UNLOCK(so, 1);
1067 #endif
1068         }
1069 #ifdef INVARIANTS
1070         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1071             !TAILQ_EMPTY(&asoc->sent_queue) ||
1072             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
1073                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1074         }
1075 #endif
1076         /* stop the timer */
1077         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1078             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1079         /* send SHUTDOWN-COMPLETE */
1080         sctp_send_shutdown_complete(stcb, net, 0);
1081         /* notify upper layer protocol */
1082         if (stcb->sctp_socket) {
1083                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1084                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1085                         stcb->sctp_socket->so_snd.sb_cc = 0;
1086                 }
1087                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1088         }
1089         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1090         /* free the TCB but first save off the ep */
1091 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1092         atomic_add_int(&stcb->asoc.refcnt, 1);
1093         SCTP_TCB_UNLOCK(stcb);
1094         SCTP_SOCKET_LOCK(so, 1);
1095         SCTP_TCB_LOCK(stcb);
1096         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1097 #endif
1098         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1099             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1100 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1101         SCTP_SOCKET_UNLOCK(so, 1);
1102 #endif
1103 }
1104
1105 static void
1106 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type,
1107     struct sctp_nets *net)
1108 {
1109         switch (chunk_type) {
1110         case SCTP_ASCONF_ACK:
1111         case SCTP_ASCONF:
1112                 sctp_asconf_cleanup(stcb, net);
1113                 break;
1114         case SCTP_IFORWARD_CUM_TSN:
1115         case SCTP_FORWARD_CUM_TSN:
1116                 stcb->asoc.prsctp_supported = 0;
1117                 break;
1118         default:
1119                 SCTPDBG(SCTP_DEBUG_INPUT2,
1120                     "Peer does not support chunk type %d (0x%x).\n",
1121                     chunk_type, chunk_type);
1122                 break;
1123         }
1124 }
1125
1126 /*
1127  * Skip past the param header and then we will find the param that caused the
1128  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1129  * these will turn of specific features.
1130  * XXX: Is this the right thing to do?
1131  */
1132 static void
1133 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
1134 {
1135         switch (parameter_type) {
1136                 /* pr-sctp draft */
1137         case SCTP_PRSCTP_SUPPORTED:
1138                 stcb->asoc.prsctp_supported = 0;
1139                 break;
1140         case SCTP_SUPPORTED_CHUNK_EXT:
1141                 break;
1142                 /* draft-ietf-tsvwg-addip-sctp */
1143         case SCTP_HAS_NAT_SUPPORT:
1144                 stcb->asoc.peer_supports_nat = 0;
1145                 break;
1146         case SCTP_ADD_IP_ADDRESS:
1147         case SCTP_DEL_IP_ADDRESS:
1148         case SCTP_SET_PRIM_ADDR:
1149                 stcb->asoc.asconf_supported = 0;
1150                 break;
1151         case SCTP_SUCCESS_REPORT:
1152         case SCTP_ERROR_CAUSE_IND:
1153                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1154                 SCTPDBG(SCTP_DEBUG_INPUT2,
1155                     "Turning off ASCONF to this strange peer\n");
1156                 stcb->asoc.asconf_supported = 0;
1157                 break;
1158         default:
1159                 SCTPDBG(SCTP_DEBUG_INPUT2,
1160                     "Peer does not support param type %d (0x%x)??\n",
1161                     parameter_type, parameter_type);
1162                 break;
1163         }
1164 }
1165
1166 static int
1167 sctp_handle_error(struct sctp_chunkhdr *ch,
1168     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
1169 {
1170         struct sctp_error_cause *cause;
1171         struct sctp_association *asoc;
1172         uint32_t remaining_length, adjust;
1173         uint16_t code, cause_code, cause_length;
1174 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1175         struct socket *so;
1176 #endif
1177
1178         /* parse through all of the errors and process */
1179         asoc = &stcb->asoc;
1180         cause = (struct sctp_error_cause *)((caddr_t)ch +
1181             sizeof(struct sctp_chunkhdr));
1182         remaining_length = ntohs(ch->chunk_length);
1183         if (remaining_length > limit) {
1184                 remaining_length = limit;
1185         }
1186         if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
1187                 remaining_length -= sizeof(struct sctp_chunkhdr);
1188         } else {
1189                 remaining_length = 0;
1190         }
1191         code = 0;
1192         while (remaining_length >= sizeof(struct sctp_error_cause)) {
1193                 /* Process an Error Cause */
1194                 cause_code = ntohs(cause->code);
1195                 cause_length = ntohs(cause->length);
1196                 if ((cause_length > remaining_length) || (cause_length == 0)) {
1197                         /* Invalid cause length, possibly due to truncation. */
1198                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
1199                             remaining_length, cause_length);
1200                         return (0);
1201                 }
1202                 if (code == 0) {
1203                         /* report the first error cause */
1204                         code = cause_code;
1205                 }
1206                 switch (cause_code) {
1207                 case SCTP_CAUSE_INVALID_STREAM:
1208                 case SCTP_CAUSE_MISSING_PARAM:
1209                 case SCTP_CAUSE_INVALID_PARAM:
1210                 case SCTP_CAUSE_NO_USER_DATA:
1211                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
1212                             cause_code);
1213                         break;
1214                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1215                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n",
1216                             ch->chunk_flags);
1217                         if (sctp_handle_nat_colliding_state(stcb)) {
1218                                 return (0);
1219                         }
1220                         break;
1221                 case SCTP_CAUSE_NAT_MISSING_STATE:
1222                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n",
1223                             ch->chunk_flags);
1224                         if (sctp_handle_nat_missing_state(stcb, net)) {
1225                                 return (0);
1226                         }
1227                         break;
1228                 case SCTP_CAUSE_STALE_COOKIE:
1229                         /*
1230                          * We only act if we have echoed a cookie and are
1231                          * waiting.
1232                          */
1233                         if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
1234                             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1235                                 struct sctp_error_stale_cookie *stale_cookie;
1236
1237                                 stale_cookie = (struct sctp_error_stale_cookie *)cause;
1238                                 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time);
1239                                 /* Double it to be more robust on RTX */
1240                                 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) {
1241                                         asoc->cookie_preserve_req *= 2;
1242                                 } else {
1243                                         asoc->cookie_preserve_req = UINT32_MAX;
1244                                 }
1245                                 asoc->stale_cookie_count++;
1246                                 if (asoc->stale_cookie_count >
1247                                     asoc->max_init_times) {
1248                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1249                                         /* now free the asoc */
1250 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1251                                         so = SCTP_INP_SO(stcb->sctp_ep);
1252                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1253                                         SCTP_TCB_UNLOCK(stcb);
1254                                         SCTP_SOCKET_LOCK(so, 1);
1255                                         SCTP_TCB_LOCK(stcb);
1256                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1257 #endif
1258                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1259                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1260 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1261                                         SCTP_SOCKET_UNLOCK(so, 1);
1262 #endif
1263                                         return (-1);
1264                                 }
1265                                 /* blast back to INIT state */
1266                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1267                                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
1268                                 sctp_stop_all_cookie_timers(stcb);
1269                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1270                         }
1271                         break;
1272                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1273                         /*
1274                          * Nothing we can do here, we don't do hostname
1275                          * addresses so if the peer does not like my IPv6
1276                          * (or IPv4 for that matter) it does not matter. If
1277                          * they don't support that type of address, they can
1278                          * NOT possibly get that packet type... i.e. with no
1279                          * IPv6 you can't receive a IPv6 packet. so we can
1280                          * safely ignore this one. If we ever added support
1281                          * for HOSTNAME Addresses, then we would need to do
1282                          * something here.
1283                          */
1284                         break;
1285                 case SCTP_CAUSE_UNRECOG_CHUNK:
1286                         if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
1287                                 struct sctp_error_unrecognized_chunk *unrec_chunk;
1288
1289                                 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
1290                                 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type, net);
1291                         }
1292                         break;
1293                 case SCTP_CAUSE_UNRECOG_PARAM:
1294                         /* XXX: We only consider the first parameter */
1295                         if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
1296                                 struct sctp_paramhdr *unrec_parameter;
1297
1298                                 unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
1299                                 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
1300                         }
1301                         break;
1302                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1303                         /*
1304                          * We ignore this since the timer will drive out a
1305                          * new cookie anyway and there timer will drive us
1306                          * to send a SHUTDOWN_COMPLETE. We can't send one
1307                          * here since we don't have their tag.
1308                          */
1309                         break;
1310                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1311                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1312                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1313                         /*
1314                          * We should NOT get these here, but in a
1315                          * ASCONF-ACK.
1316                          */
1317                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
1318                             cause_code);
1319                         break;
1320                 case SCTP_CAUSE_OUT_OF_RESC:
1321                         /*
1322                          * And what, pray tell do we do with the fact that
1323                          * the peer is out of resources? Not really sure we
1324                          * could do anything but abort. I suspect this
1325                          * should have came WITH an abort instead of in a
1326                          * OP-ERROR.
1327                          */
1328                         break;
1329                 default:
1330                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
1331                             cause_code);
1332                         break;
1333                 }
1334                 adjust = SCTP_SIZE32(cause_length);
1335                 if (remaining_length >= adjust) {
1336                         remaining_length -= adjust;
1337                 } else {
1338                         remaining_length = 0;
1339                 }
1340                 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
1341         }
1342         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
1343         return (0);
1344 }
1345
1346 static int
1347 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1348     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1349     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1350     struct sctp_nets *net, int *abort_no_unlock,
1351     uint8_t mflowtype, uint32_t mflowid,
1352     uint32_t vrf_id)
1353 {
1354         struct sctp_init_ack *init_ack;
1355         struct mbuf *op_err;
1356
1357         SCTPDBG(SCTP_DEBUG_INPUT2,
1358             "sctp_handle_init_ack: handling INIT-ACK\n");
1359
1360         if (stcb == NULL) {
1361                 SCTPDBG(SCTP_DEBUG_INPUT2,
1362                     "sctp_handle_init_ack: TCB is null\n");
1363                 return (-1);
1364         }
1365         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1366                 /* Invalid length */
1367                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1368                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1369                     src, dst, sh, op_err,
1370                     mflowtype, mflowid,
1371                     vrf_id, net->port);
1372                 *abort_no_unlock = 1;
1373                 return (-1);
1374         }
1375         init_ack = &cp->init;
1376         /* validate parameters */
1377         if (init_ack->initiate_tag == 0) {
1378                 /* protocol error... send an abort */
1379                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1380                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1381                     src, dst, sh, op_err,
1382                     mflowtype, mflowid,
1383                     vrf_id, net->port);
1384                 *abort_no_unlock = 1;
1385                 return (-1);
1386         }
1387         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1388                 /* protocol error... send an abort */
1389                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1390                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1391                     src, dst, sh, op_err,
1392                     mflowtype, mflowid,
1393                     vrf_id, net->port);
1394                 *abort_no_unlock = 1;
1395                 return (-1);
1396         }
1397         if (init_ack->num_inbound_streams == 0) {
1398                 /* protocol error... send an abort */
1399                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1400                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1401                     src, dst, sh, op_err,
1402                     mflowtype, mflowid,
1403                     vrf_id, net->port);
1404                 *abort_no_unlock = 1;
1405                 return (-1);
1406         }
1407         if (init_ack->num_outbound_streams == 0) {
1408                 /* protocol error... send an abort */
1409                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1410                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1411                     src, dst, sh, op_err,
1412                     mflowtype, mflowid,
1413                     vrf_id, net->port);
1414                 *abort_no_unlock = 1;
1415                 return (-1);
1416         }
1417         /* process according to association state... */
1418         switch (SCTP_GET_STATE(stcb)) {
1419         case SCTP_STATE_COOKIE_WAIT:
1420                 /* this is the expected state for this chunk */
1421                 /* process the INIT-ACK parameters */
1422                 if (stcb->asoc.primary_destination->dest_state &
1423                     SCTP_ADDR_UNCONFIRMED) {
1424                         /*
1425                          * The primary is where we sent the INIT, we can
1426                          * always consider it confirmed when the INIT-ACK is
1427                          * returned. Do this before we load addresses
1428                          * though.
1429                          */
1430                         stcb->asoc.primary_destination->dest_state &=
1431                             ~SCTP_ADDR_UNCONFIRMED;
1432                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1433                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1434                 }
1435                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1436                     net, abort_no_unlock,
1437                     mflowtype, mflowid,
1438                     vrf_id) < 0) {
1439                         /* error in parsing parameters */
1440                         return (-1);
1441                 }
1442                 /* update our state */
1443                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1444                 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
1445
1446                 /* reset the RTO calc */
1447                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1448                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1449                             stcb->asoc.overall_error_count,
1450                             0,
1451                             SCTP_FROM_SCTP_INPUT,
1452                             __LINE__);
1453                 }
1454                 stcb->asoc.overall_error_count = 0;
1455                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1456                 /*
1457                  * collapse the init timer back in case of a exponential
1458                  * backoff
1459                  */
1460                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1461                     stcb, net);
1462                 /*
1463                  * the send at the end of the inbound data processing will
1464                  * cause the cookie to be sent
1465                  */
1466                 break;
1467         case SCTP_STATE_SHUTDOWN_SENT:
1468                 /* incorrect state... discard */
1469                 break;
1470         case SCTP_STATE_COOKIE_ECHOED:
1471                 /* incorrect state... discard */
1472                 break;
1473         case SCTP_STATE_OPEN:
1474                 /* incorrect state... discard */
1475                 break;
1476         case SCTP_STATE_EMPTY:
1477         case SCTP_STATE_INUSE:
1478         default:
1479                 /* incorrect state... discard */
1480                 return (-1);
1481                 break;
1482         }
1483         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1484         return (0);
1485 }
1486
1487 static struct sctp_tcb *
1488 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1489     struct sockaddr *src, struct sockaddr *dst,
1490     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1491     struct sctp_inpcb *inp, struct sctp_nets **netp,
1492     struct sockaddr *init_src, int *notification,
1493     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1494     uint8_t mflowtype, uint32_t mflowid,
1495     uint32_t vrf_id, uint16_t port);
1496
1497
1498 /*
1499  * handle a state cookie for an existing association m: input packet mbuf
1500  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1501  * "split" mbuf and the cookie signature does not exist offset: offset into
1502  * mbuf to the cookie-echo chunk
1503  */
1504 static struct sctp_tcb *
1505 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1506     struct sockaddr *src, struct sockaddr *dst,
1507     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1508     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1509     struct sockaddr *init_src, int *notification,
1510     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1511     uint8_t mflowtype, uint32_t mflowid,
1512     uint32_t vrf_id, uint16_t port)
1513 {
1514         struct sctp_association *asoc;
1515         struct sctp_init_chunk *init_cp, init_buf;
1516         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1517         struct sctp_nets *net;
1518         struct mbuf *op_err;
1519         struct timeval old;
1520         int init_offset, initack_offset, i;
1521         int retval;
1522         int spec_flag = 0;
1523         uint32_t how_indx;
1524 #if defined(SCTP_DETAILED_STR_STATS)
1525         int j;
1526 #endif
1527
1528         net = *netp;
1529         /* I know that the TCB is non-NULL from the caller */
1530         asoc = &stcb->asoc;
1531         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1532                 if (asoc->cookie_how[how_indx] == 0)
1533                         break;
1534         }
1535         if (how_indx < sizeof(asoc->cookie_how)) {
1536                 asoc->cookie_how[how_indx] = 1;
1537         }
1538         if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1539                 /* SHUTDOWN came in after sending INIT-ACK */
1540                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1541                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1542                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1543                     mflowtype, mflowid, inp->fibnum,
1544                     vrf_id, net->port);
1545                 if (how_indx < sizeof(asoc->cookie_how))
1546                         asoc->cookie_how[how_indx] = 2;
1547                 return (NULL);
1548         }
1549         /*
1550          * find and validate the INIT chunk in the cookie (peer's info) the
1551          * INIT should start after the cookie-echo header struct (chunk
1552          * header, state cookie header struct)
1553          */
1554         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1555
1556         init_cp = (struct sctp_init_chunk *)
1557             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1558             (uint8_t *)&init_buf);
1559         if (init_cp == NULL) {
1560                 /* could not pull a INIT chunk in cookie */
1561                 return (NULL);
1562         }
1563         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1564                 return (NULL);
1565         }
1566         /*
1567          * find and validate the INIT-ACK chunk in the cookie (my info) the
1568          * INIT-ACK follows the INIT chunk
1569          */
1570         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1571         initack_cp = (struct sctp_init_ack_chunk *)
1572             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1573             (uint8_t *)&initack_buf);
1574         if (initack_cp == NULL) {
1575                 /* could not pull INIT-ACK chunk in cookie */
1576                 return (NULL);
1577         }
1578         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1579                 return (NULL);
1580         }
1581         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1582             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1583                 /*
1584                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1585                  * to get into the OPEN state
1586                  */
1587                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1588                         /*-
1589                          * Opps, this means that we somehow generated two vtag's
1590                          * the same. I.e. we did:
1591                          *  Us               Peer
1592                          *   <---INIT(tag=a)------
1593                          *   ----INIT-ACK(tag=t)-->
1594                          *   ----INIT(tag=t)------> *1
1595                          *   <---INIT-ACK(tag=a)---
1596                          *   <----CE(tag=t)------------- *2
1597                          *
1598                          * At point *1 we should be generating a different
1599                          * tag t'. Which means we would throw away the CE and send
1600                          * ours instead. Basically this is case C (throw away side).
1601                          */
1602                         if (how_indx < sizeof(asoc->cookie_how))
1603                                 asoc->cookie_how[how_indx] = 17;
1604                         return (NULL);
1605
1606                 }
1607                 switch (SCTP_GET_STATE(stcb)) {
1608                 case SCTP_STATE_COOKIE_WAIT:
1609                 case SCTP_STATE_COOKIE_ECHOED:
1610                         /*
1611                          * INIT was sent but got a COOKIE_ECHO with the
1612                          * correct tags... just accept it...but we must
1613                          * process the init so that we can make sure we have
1614                          * the right seq no's.
1615                          */
1616                         /* First we must process the INIT !! */
1617                         retval = sctp_process_init(init_cp, stcb);
1618                         if (retval < 0) {
1619                                 if (how_indx < sizeof(asoc->cookie_how))
1620                                         asoc->cookie_how[how_indx] = 3;
1621                                 return (NULL);
1622                         }
1623                         /* we have already processed the INIT so no problem */
1624                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1625                             stcb, net,
1626                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1627                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1628                             stcb, net,
1629                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1630                         /* update current state */
1631                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1632                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1633                         else
1634                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1635
1636                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1637                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1638                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1639                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1640                         }
1641                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1642                         sctp_stop_all_cookie_timers(stcb);
1643                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1644                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1645                             (!SCTP_IS_LISTENING(inp))) {
1646 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1647                                 struct socket *so;
1648 #endif
1649                                 /*
1650                                  * Here is where collision would go if we
1651                                  * did a connect() and instead got a
1652                                  * init/init-ack/cookie done before the
1653                                  * init-ack came back..
1654                                  */
1655                                 stcb->sctp_ep->sctp_flags |=
1656                                     SCTP_PCB_FLAGS_CONNECTED;
1657 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1658                                 so = SCTP_INP_SO(stcb->sctp_ep);
1659                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1660                                 SCTP_TCB_UNLOCK(stcb);
1661                                 SCTP_SOCKET_LOCK(so, 1);
1662                                 SCTP_TCB_LOCK(stcb);
1663                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1664                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1665                                         SCTP_SOCKET_UNLOCK(so, 1);
1666                                         return (NULL);
1667                                 }
1668 #endif
1669                                 soisconnected(stcb->sctp_socket);
1670 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1671                                 SCTP_SOCKET_UNLOCK(so, 1);
1672 #endif
1673                         }
1674                         /* notify upper layer */
1675                         *notification = SCTP_NOTIFY_ASSOC_UP;
1676                         /*
1677                          * since we did not send a HB make sure we don't
1678                          * double things
1679                          */
1680                         old.tv_sec = cookie->time_entered.tv_sec;
1681                         old.tv_usec = cookie->time_entered.tv_usec;
1682                         net->hb_responded = 1;
1683                         sctp_calculate_rto(stcb, asoc, net, &old,
1684                             SCTP_RTT_FROM_NON_DATA);
1685
1686                         if (stcb->asoc.sctp_autoclose_ticks &&
1687                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1688                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1689                                     inp, stcb, NULL);
1690                         }
1691                         break;
1692                 default:
1693                         /*
1694                          * we're in the OPEN state (or beyond), so peer must
1695                          * have simply lost the COOKIE-ACK
1696                          */
1697                         break;
1698                 }               /* end switch */
1699                 sctp_stop_all_cookie_timers(stcb);
1700                 /*
1701                  * We ignore the return code here.. not sure if we should
1702                  * somehow abort.. but we do have an existing asoc. This
1703                  * really should not fail.
1704                  */
1705                 if (sctp_load_addresses_from_init(stcb, m,
1706                     init_offset + sizeof(struct sctp_init_chunk),
1707                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1708                         if (how_indx < sizeof(asoc->cookie_how))
1709                                 asoc->cookie_how[how_indx] = 4;
1710                         return (NULL);
1711                 }
1712                 /* respond with a COOKIE-ACK */
1713                 sctp_toss_old_cookies(stcb, asoc);
1714                 sctp_send_cookie_ack(stcb);
1715                 if (how_indx < sizeof(asoc->cookie_how))
1716                         asoc->cookie_how[how_indx] = 5;
1717                 return (stcb);
1718         }
1719
1720         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1721             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1722             cookie->tie_tag_my_vtag == 0 &&
1723             cookie->tie_tag_peer_vtag == 0) {
1724                 /*
1725                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1726                  */
1727                 if (how_indx < sizeof(asoc->cookie_how))
1728                         asoc->cookie_how[how_indx] = 6;
1729                 return (NULL);
1730         }
1731         /*
1732          * If nat support, and the below and stcb is established, send back
1733          * a ABORT(colliding state) if we are established.
1734          */
1735         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
1736             (asoc->peer_supports_nat) &&
1737             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1738             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1739             (asoc->peer_vtag == 0)))) {
1740                 /*
1741                  * Special case - Peer's support nat. We may have two init's
1742                  * that we gave out the same tag on since one was not
1743                  * established.. i.e. we get INIT from host-1 behind the nat
1744                  * and we respond tag-a, we get a INIT from host-2 behind
1745                  * the nat and we get tag-a again. Then we bring up host-1
1746                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1747                  * Now we have colliding state. We must send an abort here
1748                  * with colliding state indication.
1749                  */
1750                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1751                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1752                     mflowtype, mflowid, inp->fibnum,
1753                     vrf_id, port);
1754                 return (NULL);
1755         }
1756         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1757             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1758             (asoc->peer_vtag == 0))) {
1759                 /*
1760                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1761                  * should be ok, re-accept peer info
1762                  */
1763                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1764                         /*
1765                          * Extension of case C. If we hit this, then the
1766                          * random number generator returned the same vtag
1767                          * when we first sent our INIT-ACK and when we later
1768                          * sent our INIT. The side with the seq numbers that
1769                          * are different will be the one that normnally
1770                          * would have hit case C. This in effect "extends"
1771                          * our vtags in this collision case to be 64 bits.
1772                          * The same collision could occur aka you get both
1773                          * vtag and seq number the same twice in a row.. but
1774                          * is much less likely. If it did happen then we
1775                          * would proceed through and bring up the assoc.. we
1776                          * may end up with the wrong stream setup however..
1777                          * which would be bad.. but there is no way to
1778                          * tell.. until we send on a stream that does not
1779                          * exist :-)
1780                          */
1781                         if (how_indx < sizeof(asoc->cookie_how))
1782                                 asoc->cookie_how[how_indx] = 7;
1783
1784                         return (NULL);
1785                 }
1786                 if (how_indx < sizeof(asoc->cookie_how))
1787                         asoc->cookie_how[how_indx] = 8;
1788                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1789                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1790                 sctp_stop_all_cookie_timers(stcb);
1791                 /*
1792                  * since we did not send a HB make sure we don't double
1793                  * things
1794                  */
1795                 net->hb_responded = 1;
1796                 if (stcb->asoc.sctp_autoclose_ticks &&
1797                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1798                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1799                             NULL);
1800                 }
1801                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1802                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1803
1804                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1805                         /*
1806                          * Ok the peer probably discarded our data (if we
1807                          * echoed a cookie+data). So anything on the
1808                          * sent_queue should be marked for retransmit, we
1809                          * may not get something to kick us so it COULD
1810                          * still take a timeout to move these.. but it can't
1811                          * hurt to mark them.
1812                          */
1813                         struct sctp_tmit_chunk *chk;
1814
1815                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1816                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1817                                         chk->sent = SCTP_DATAGRAM_RESEND;
1818                                         sctp_flight_size_decrease(chk);
1819                                         sctp_total_flight_decrease(stcb, chk);
1820                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1821                                         spec_flag++;
1822                                 }
1823                         }
1824
1825                 }
1826                 /* process the INIT info (peer's info) */
1827                 retval = sctp_process_init(init_cp, stcb);
1828                 if (retval < 0) {
1829                         if (how_indx < sizeof(asoc->cookie_how))
1830                                 asoc->cookie_how[how_indx] = 9;
1831                         return (NULL);
1832                 }
1833                 if (sctp_load_addresses_from_init(stcb, m,
1834                     init_offset + sizeof(struct sctp_init_chunk),
1835                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
1836                         if (how_indx < sizeof(asoc->cookie_how))
1837                                 asoc->cookie_how[how_indx] = 10;
1838                         return (NULL);
1839                 }
1840                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
1841                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
1842                         *notification = SCTP_NOTIFY_ASSOC_UP;
1843
1844                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1845                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1846                             (!SCTP_IS_LISTENING(inp))) {
1847 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1848                                 struct socket *so;
1849 #endif
1850                                 stcb->sctp_ep->sctp_flags |=
1851                                     SCTP_PCB_FLAGS_CONNECTED;
1852 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1853                                 so = SCTP_INP_SO(stcb->sctp_ep);
1854                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1855                                 SCTP_TCB_UNLOCK(stcb);
1856                                 SCTP_SOCKET_LOCK(so, 1);
1857                                 SCTP_TCB_LOCK(stcb);
1858                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1859                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1860                                         SCTP_SOCKET_UNLOCK(so, 1);
1861                                         return (NULL);
1862                                 }
1863 #endif
1864                                 soisconnected(stcb->sctp_socket);
1865 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1866                                 SCTP_SOCKET_UNLOCK(so, 1);
1867 #endif
1868                         }
1869                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
1870                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1871                         else
1872                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1873                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1874                 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1875                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1876                 } else {
1877                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1878                 }
1879                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1880                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1881                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1882                             stcb->sctp_ep, stcb, asoc->primary_destination);
1883                 }
1884                 sctp_stop_all_cookie_timers(stcb);
1885                 sctp_toss_old_cookies(stcb, asoc);
1886                 sctp_send_cookie_ack(stcb);
1887                 if (spec_flag) {
1888                         /*
1889                          * only if we have retrans set do we do this. What
1890                          * this call does is get only the COOKIE-ACK out and
1891                          * then when we return the normal call to
1892                          * sctp_chunk_output will get the retrans out behind
1893                          * this.
1894                          */
1895                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1896                 }
1897                 if (how_indx < sizeof(asoc->cookie_how))
1898                         asoc->cookie_how[how_indx] = 11;
1899
1900                 return (stcb);
1901         }
1902         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1903             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1904             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1905             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1906             cookie->tie_tag_peer_vtag != 0) {
1907                 struct sctpasochead *head;
1908 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1909                 struct socket *so;
1910 #endif
1911
1912                 if (asoc->peer_supports_nat) {
1913                         /*
1914                          * This is a gross gross hack. Just call the
1915                          * cookie_new code since we are allowing a duplicate
1916                          * association. I hope this works...
1917                          */
1918                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1919                             sh, cookie, cookie_len,
1920                             inp, netp, init_src, notification,
1921                             auth_skipped, auth_offset, auth_len,
1922                             mflowtype, mflowid,
1923                             vrf_id, port));
1924                 }
1925                 /*
1926                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1927                  */
1928                 /* temp code */
1929                 if (how_indx < sizeof(asoc->cookie_how))
1930                         asoc->cookie_how[how_indx] = 12;
1931                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1932                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1933                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1934                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1935
1936                 /* notify upper layer */
1937                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1938                 atomic_add_int(&stcb->asoc.refcnt, 1);
1939                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
1940                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1941                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
1942                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1943                 }
1944                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
1945                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1946                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1947                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1948                 }
1949                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1950                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1951                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1952                             stcb->sctp_ep, stcb, asoc->primary_destination);
1953
1954                 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
1955                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1956                         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
1957                 }
1958                 asoc->pre_open_streams =
1959                     ntohs(initack_cp->init.num_outbound_streams);
1960                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1961                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1962                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1963
1964                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1965
1966                 asoc->str_reset_seq_in = asoc->init_seq_number;
1967
1968                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1969                 if (asoc->mapping_array) {
1970                         memset(asoc->mapping_array, 0,
1971                             asoc->mapping_array_size);
1972                 }
1973                 if (asoc->nr_mapping_array) {
1974                         memset(asoc->nr_mapping_array, 0,
1975                             asoc->mapping_array_size);
1976                 }
1977                 SCTP_TCB_UNLOCK(stcb);
1978 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1979                 so = SCTP_INP_SO(stcb->sctp_ep);
1980                 SCTP_SOCKET_LOCK(so, 1);
1981 #endif
1982                 SCTP_INP_INFO_WLOCK();
1983                 SCTP_INP_WLOCK(stcb->sctp_ep);
1984                 SCTP_TCB_LOCK(stcb);
1985                 atomic_add_int(&stcb->asoc.refcnt, -1);
1986                 /* send up all the data */
1987                 SCTP_TCB_SEND_LOCK(stcb);
1988
1989                 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
1990                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1991                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1992 #if defined(SCTP_DETAILED_STR_STATS)
1993                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1994                                 asoc->strmout[i].abandoned_sent[j] = 0;
1995                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1996                         }
1997 #else
1998                         asoc->strmout[i].abandoned_sent[0] = 0;
1999                         asoc->strmout[i].abandoned_unsent[0] = 0;
2000 #endif
2001                         stcb->asoc.strmout[i].sid = i;
2002                         stcb->asoc.strmout[i].next_mid_ordered = 0;
2003                         stcb->asoc.strmout[i].next_mid_unordered = 0;
2004                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
2005                 }
2006                 /* process the INIT-ACK info (my info) */
2007                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2008                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2009
2010                 /* pull from vtag hash */
2011                 LIST_REMOVE(stcb, sctp_asocs);
2012                 /* re-insert to new vtag position */
2013                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
2014                     SCTP_BASE_INFO(hashasocmark))];
2015                 /*
2016                  * put it in the bucket in the vtag hash of assoc's for the
2017                  * system
2018                  */
2019                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
2020
2021                 SCTP_TCB_SEND_UNLOCK(stcb);
2022                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
2023                 SCTP_INP_INFO_WUNLOCK();
2024 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2025                 SCTP_SOCKET_UNLOCK(so, 1);
2026 #endif
2027                 asoc->total_flight = 0;
2028                 asoc->total_flight_count = 0;
2029                 /* process the INIT info (peer's info) */
2030                 retval = sctp_process_init(init_cp, stcb);
2031                 if (retval < 0) {
2032                         if (how_indx < sizeof(asoc->cookie_how))
2033                                 asoc->cookie_how[how_indx] = 13;
2034
2035                         return (NULL);
2036                 }
2037                 /*
2038                  * since we did not send a HB make sure we don't double
2039                  * things
2040                  */
2041                 net->hb_responded = 1;
2042
2043                 if (sctp_load_addresses_from_init(stcb, m,
2044                     init_offset + sizeof(struct sctp_init_chunk),
2045                     initack_offset, src, dst, init_src, stcb->asoc.port)) {
2046                         if (how_indx < sizeof(asoc->cookie_how))
2047                                 asoc->cookie_how[how_indx] = 14;
2048
2049                         return (NULL);
2050                 }
2051                 /* respond with a COOKIE-ACK */
2052                 sctp_stop_all_cookie_timers(stcb);
2053                 sctp_toss_old_cookies(stcb, asoc);
2054                 sctp_send_cookie_ack(stcb);
2055                 if (how_indx < sizeof(asoc->cookie_how))
2056                         asoc->cookie_how[how_indx] = 15;
2057
2058                 return (stcb);
2059         }
2060         if (how_indx < sizeof(asoc->cookie_how))
2061                 asoc->cookie_how[how_indx] = 16;
2062         /* all other cases... */
2063         return (NULL);
2064 }
2065
2066
2067 /*
2068  * handle a state cookie for a new association m: input packet mbuf chain--
2069  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2070  * and the cookie signature does not exist offset: offset into mbuf to the
2071  * cookie-echo chunk length: length of the cookie chunk to: where the init
2072  * was from returns a new TCB
2073  */
2074 static struct sctp_tcb *
2075 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2076     struct sockaddr *src, struct sockaddr *dst,
2077     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2078     struct sctp_inpcb *inp, struct sctp_nets **netp,
2079     struct sockaddr *init_src, int *notification,
2080     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2081     uint8_t mflowtype, uint32_t mflowid,
2082     uint32_t vrf_id, uint16_t port)
2083 {
2084         struct sctp_tcb *stcb;
2085         struct sctp_init_chunk *init_cp, init_buf;
2086         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2087         union sctp_sockstore store;
2088         struct sctp_association *asoc;
2089         int init_offset, initack_offset, initack_limit;
2090         int retval;
2091         int error = 0;
2092         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2093 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2094         struct socket *so;
2095
2096         so = SCTP_INP_SO(inp);
2097 #endif
2098
2099         /*
2100          * find and validate the INIT chunk in the cookie (peer's info) the
2101          * INIT should start after the cookie-echo header struct (chunk
2102          * header, state cookie header struct)
2103          */
2104         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2105         init_cp = (struct sctp_init_chunk *)
2106             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2107             (uint8_t *)&init_buf);
2108         if (init_cp == NULL) {
2109                 /* could not pull a INIT chunk in cookie */
2110                 SCTPDBG(SCTP_DEBUG_INPUT1,
2111                     "process_cookie_new: could not pull INIT chunk hdr\n");
2112                 return (NULL);
2113         }
2114         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2115                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2116                 return (NULL);
2117         }
2118         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2119         /*
2120          * find and validate the INIT-ACK chunk in the cookie (my info) the
2121          * INIT-ACK follows the INIT chunk
2122          */
2123         initack_cp = (struct sctp_init_ack_chunk *)
2124             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2125             (uint8_t *)&initack_buf);
2126         if (initack_cp == NULL) {
2127                 /* could not pull INIT-ACK chunk in cookie */
2128                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2129                 return (NULL);
2130         }
2131         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2132                 return (NULL);
2133         }
2134         /*
2135          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2136          * "initack_limit" value.  This is because the chk_length field
2137          * includes the length of the cookie, but the cookie is omitted when
2138          * the INIT and INIT_ACK are tacked onto the cookie...
2139          */
2140         initack_limit = offset + cookie_len;
2141
2142         /*
2143          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2144          * and popluate
2145          */
2146
2147         /*
2148          * Here we do a trick, we set in NULL for the proc/thread argument.
2149          * We do this since in effect we only use the p argument when the
2150          * socket is unbound and we must do an implicit bind. Since we are
2151          * getting a cookie, we cannot be unbound.
2152          */
2153         stcb = sctp_aloc_assoc(inp, init_src, &error,
2154             ntohl(initack_cp->init.initiate_tag), vrf_id,
2155             ntohs(initack_cp->init.num_outbound_streams),
2156             port,
2157             (struct thread *)NULL,
2158             SCTP_DONT_INITIALIZE_AUTH_PARAMS);
2159         if (stcb == NULL) {
2160                 struct mbuf *op_err;
2161
2162                 /* memory problem? */
2163                 SCTPDBG(SCTP_DEBUG_INPUT1,
2164                     "process_cookie_new: no room for another TCB!\n");
2165                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2166                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2167                     src, dst, sh, op_err,
2168                     mflowtype, mflowid,
2169                     vrf_id, port);
2170                 return (NULL);
2171         }
2172         /* get the correct sctp_nets */
2173         if (netp)
2174                 *netp = sctp_findnet(stcb, init_src);
2175
2176         asoc = &stcb->asoc;
2177         /* get scope variables out of cookie */
2178         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2179         asoc->scope.site_scope = cookie->site_scope;
2180         asoc->scope.local_scope = cookie->local_scope;
2181         asoc->scope.loopback_scope = cookie->loopback_scope;
2182
2183         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2184             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2185                 struct mbuf *op_err;
2186
2187                 /*
2188                  * Houston we have a problem. The EP changed while the
2189                  * cookie was in flight. Only recourse is to abort the
2190                  * association.
2191                  */
2192                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2193                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2194                     src, dst, sh, op_err,
2195                     mflowtype, mflowid,
2196                     vrf_id, port);
2197 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2198                 atomic_add_int(&stcb->asoc.refcnt, 1);
2199                 SCTP_TCB_UNLOCK(stcb);
2200                 SCTP_SOCKET_LOCK(so, 1);
2201                 SCTP_TCB_LOCK(stcb);
2202                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2203 #endif
2204                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2205                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2206 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2207                 SCTP_SOCKET_UNLOCK(so, 1);
2208 #endif
2209                 return (NULL);
2210         }
2211         /* process the INIT-ACK info (my info) */
2212         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2213         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2214         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2215         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2216         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2217         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2218         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2219         asoc->str_reset_seq_in = asoc->init_seq_number;
2220
2221         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2222
2223         /* process the INIT info (peer's info) */
2224         if (netp)
2225                 retval = sctp_process_init(init_cp, stcb);
2226         else
2227                 retval = 0;
2228         if (retval < 0) {
2229 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2230                 atomic_add_int(&stcb->asoc.refcnt, 1);
2231                 SCTP_TCB_UNLOCK(stcb);
2232                 SCTP_SOCKET_LOCK(so, 1);
2233                 SCTP_TCB_LOCK(stcb);
2234                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2235 #endif
2236                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2237                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2238 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2239                 SCTP_SOCKET_UNLOCK(so, 1);
2240 #endif
2241                 return (NULL);
2242         }
2243         /* load all addresses */
2244         if (sctp_load_addresses_from_init(stcb, m,
2245             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2246             src, dst, init_src, port)) {
2247 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2248                 atomic_add_int(&stcb->asoc.refcnt, 1);
2249                 SCTP_TCB_UNLOCK(stcb);
2250                 SCTP_SOCKET_LOCK(so, 1);
2251                 SCTP_TCB_LOCK(stcb);
2252                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2253 #endif
2254                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2255                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2256 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2257                 SCTP_SOCKET_UNLOCK(so, 1);
2258 #endif
2259                 return (NULL);
2260         }
2261         /*
2262          * verify any preceding AUTH chunk that was skipped
2263          */
2264         /* pull the local authentication parameters from the cookie/init-ack */
2265         sctp_auth_get_cookie_params(stcb, m,
2266             initack_offset + sizeof(struct sctp_init_ack_chunk),
2267             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2268         if (auth_skipped) {
2269                 struct sctp_auth_chunk *auth;
2270
2271                 auth = (struct sctp_auth_chunk *)
2272                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2273                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2274                         /* auth HMAC failed, dump the assoc and packet */
2275                         SCTPDBG(SCTP_DEBUG_AUTH1,
2276                             "COOKIE-ECHO: AUTH failed\n");
2277 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2278                         atomic_add_int(&stcb->asoc.refcnt, 1);
2279                         SCTP_TCB_UNLOCK(stcb);
2280                         SCTP_SOCKET_LOCK(so, 1);
2281                         SCTP_TCB_LOCK(stcb);
2282                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2283 #endif
2284                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2285                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2286 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2287                         SCTP_SOCKET_UNLOCK(so, 1);
2288 #endif
2289                         return (NULL);
2290                 } else {
2291                         /* remaining chunks checked... good to go */
2292                         stcb->asoc.authenticated = 1;
2293                 }
2294         }
2295
2296         /*
2297          * if we're doing ASCONFs, check to see if we have any new local
2298          * addresses that need to get added to the peer (eg. addresses
2299          * changed while cookie echo in flight).  This needs to be done
2300          * after we go to the OPEN state to do the correct asconf
2301          * processing. else, make sure we have the correct addresses in our
2302          * lists
2303          */
2304
2305         /* warning, we re-use sin, sin6, sa_store here! */
2306         /* pull in local_address (our "from" address) */
2307         switch (cookie->laddr_type) {
2308 #ifdef INET
2309         case SCTP_IPV4_ADDRESS:
2310                 /* source addr is IPv4 */
2311                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2312                 store.sin.sin_family = AF_INET;
2313                 store.sin.sin_len = sizeof(struct sockaddr_in);
2314                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2315                 break;
2316 #endif
2317 #ifdef INET6
2318         case SCTP_IPV6_ADDRESS:
2319                 /* source addr is IPv6 */
2320                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2321                 store.sin6.sin6_family = AF_INET6;
2322                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2323                 store.sin6.sin6_scope_id = cookie->scope_id;
2324                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2325                 break;
2326 #endif
2327         default:
2328 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2329                 atomic_add_int(&stcb->asoc.refcnt, 1);
2330                 SCTP_TCB_UNLOCK(stcb);
2331                 SCTP_SOCKET_LOCK(so, 1);
2332                 SCTP_TCB_LOCK(stcb);
2333                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2334 #endif
2335                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2336                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2337 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2338                 SCTP_SOCKET_UNLOCK(so, 1);
2339 #endif
2340                 return (NULL);
2341         }
2342
2343         /* update current state */
2344         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2345         SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2346         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2347                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2348                     stcb->sctp_ep, stcb, asoc->primary_destination);
2349         }
2350         sctp_stop_all_cookie_timers(stcb);
2351         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2352         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2353
2354         /* set up to notify upper layer */
2355         *notification = SCTP_NOTIFY_ASSOC_UP;
2356         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2357             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2358             (!SCTP_IS_LISTENING(inp))) {
2359                 /*
2360                  * This is an endpoint that called connect() how it got a
2361                  * cookie that is NEW is a bit of a mystery. It must be that
2362                  * the INIT was sent, but before it got there.. a complete
2363                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2364                  * should have went to the other code.. not here.. oh well..
2365                  * a bit of protection is worth having..
2366                  */
2367                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2368 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2369                 atomic_add_int(&stcb->asoc.refcnt, 1);
2370                 SCTP_TCB_UNLOCK(stcb);
2371                 SCTP_SOCKET_LOCK(so, 1);
2372                 SCTP_TCB_LOCK(stcb);
2373                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2374                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2375                         SCTP_SOCKET_UNLOCK(so, 1);
2376                         return (NULL);
2377                 }
2378 #endif
2379                 soisconnected(stcb->sctp_socket);
2380 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2381                 SCTP_SOCKET_UNLOCK(so, 1);
2382 #endif
2383         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2384             (SCTP_IS_LISTENING(inp))) {
2385                 /*
2386                  * We don't want to do anything with this one. Since it is
2387                  * the listening guy. The timer will get started for
2388                  * accepted connections in the caller.
2389                  */
2390                 ;
2391         }
2392         /* since we did not send a HB make sure we don't double things */
2393         if ((netp) && (*netp))
2394                 (*netp)->hb_responded = 1;
2395
2396         if (stcb->asoc.sctp_autoclose_ticks &&
2397             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2398                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2399         }
2400         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2401         if ((netp != NULL) && (*netp != NULL)) {
2402                 struct timeval old;
2403
2404                 /* calculate the RTT and set the encaps port */
2405                 old.tv_sec = cookie->time_entered.tv_sec;
2406                 old.tv_usec = cookie->time_entered.tv_usec;
2407                 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
2408         }
2409         /* respond with a COOKIE-ACK */
2410         sctp_send_cookie_ack(stcb);
2411
2412         /*
2413          * check the address lists for any ASCONFs that need to be sent
2414          * AFTER the cookie-ack is sent
2415          */
2416         sctp_check_address_list(stcb, m,
2417             initack_offset + sizeof(struct sctp_init_ack_chunk),
2418             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2419             &store.sa, cookie->local_scope, cookie->site_scope,
2420             cookie->ipv4_scope, cookie->loopback_scope);
2421
2422
2423         return (stcb);
2424 }
2425
2426 /*
2427  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2428  * we NEED to make sure we are not already using the vtag. If so we
2429  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2430         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2431                                                             SCTP_BASE_INFO(hashasocmark))];
2432         LIST_FOREACH(stcb, head, sctp_asocs) {
2433                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2434                        -- SEND ABORT - TRY AGAIN --
2435                 }
2436         }
2437 */
2438
2439 /*
2440  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2441  * existing (non-NULL) TCB
2442  */
2443 static struct mbuf *
2444 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2445     struct sockaddr *src, struct sockaddr *dst,
2446     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2447     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2448     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2449     struct sctp_tcb **locked_tcb,
2450     uint8_t mflowtype, uint32_t mflowid,
2451     uint32_t vrf_id, uint16_t port)
2452 {
2453         struct sctp_state_cookie *cookie;
2454         struct sctp_tcb *l_stcb = *stcb;
2455         struct sctp_inpcb *l_inp;
2456         struct sockaddr *to;
2457         struct sctp_pcb *ep;
2458         struct mbuf *m_sig;
2459         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2460         uint8_t *sig;
2461         uint8_t cookie_ok = 0;
2462         unsigned int sig_offset, cookie_offset;
2463         unsigned int cookie_len;
2464         struct timeval now;
2465         struct timeval time_expires;
2466         int notification = 0;
2467         struct sctp_nets *netl;
2468         int had_a_existing_tcb = 0;
2469         int send_int_conf = 0;
2470 #ifdef INET
2471         struct sockaddr_in sin;
2472 #endif
2473 #ifdef INET6
2474         struct sockaddr_in6 sin6;
2475 #endif
2476
2477         SCTPDBG(SCTP_DEBUG_INPUT2,
2478             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2479
2480         if (inp_p == NULL) {
2481                 return (NULL);
2482         }
2483         cookie = &cp->cookie;
2484         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2485         cookie_len = ntohs(cp->ch.chunk_length);
2486
2487         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2488             sizeof(struct sctp_init_chunk) +
2489             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2490                 /* cookie too small */
2491                 return (NULL);
2492         }
2493         if ((cookie->peerport != sh->src_port) ||
2494             (cookie->myport != sh->dest_port) ||
2495             (cookie->my_vtag != sh->v_tag)) {
2496                 /*
2497                  * invalid ports or bad tag.  Note that we always leave the
2498                  * v_tag in the header in network order and when we stored
2499                  * it in the my_vtag slot we also left it in network order.
2500                  * This maintains the match even though it may be in the
2501                  * opposite byte order of the machine :->
2502                  */
2503                 return (NULL);
2504         }
2505         /*
2506          * split off the signature into its own mbuf (since it should not be
2507          * calculated in the sctp_hmac_m() call).
2508          */
2509         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2510         m_sig = m_split(m, sig_offset, M_NOWAIT);
2511         if (m_sig == NULL) {
2512                 /* out of memory or ?? */
2513                 return (NULL);
2514         }
2515 #ifdef SCTP_MBUF_LOGGING
2516         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2517                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2518         }
2519 #endif
2520
2521         /*
2522          * compute the signature/digest for the cookie
2523          */
2524         ep = &(*inp_p)->sctp_ep;
2525         l_inp = *inp_p;
2526         if (l_stcb) {
2527                 SCTP_TCB_UNLOCK(l_stcb);
2528         }
2529         SCTP_INP_RLOCK(l_inp);
2530         if (l_stcb) {
2531                 SCTP_TCB_LOCK(l_stcb);
2532         }
2533         /* which cookie is it? */
2534         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2535             (ep->current_secret_number != ep->last_secret_number)) {
2536                 /* it's the old cookie */
2537                 (void)sctp_hmac_m(SCTP_HMAC,
2538                     (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2539                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2540         } else {
2541                 /* it's the current cookie */
2542                 (void)sctp_hmac_m(SCTP_HMAC,
2543                     (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
2544                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2545         }
2546         /* get the signature */
2547         SCTP_INP_RUNLOCK(l_inp);
2548         sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig);
2549         if (sig == NULL) {
2550                 /* couldn't find signature */
2551                 sctp_m_freem(m_sig);
2552                 return (NULL);
2553         }
2554         /* compare the received digest with the computed digest */
2555         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2556                 /* try the old cookie? */
2557                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2558                     (ep->current_secret_number != ep->last_secret_number)) {
2559                         /* compute digest with old */
2560                         (void)sctp_hmac_m(SCTP_HMAC,
2561                             (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
2562                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2563                         /* compare */
2564                         if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2565                                 cookie_ok = 1;
2566                 }
2567         } else {
2568                 cookie_ok = 1;
2569         }
2570
2571         /*
2572          * Now before we continue we must reconstruct our mbuf so that
2573          * normal processing of any other chunks will work.
2574          */
2575         {
2576                 struct mbuf *m_at;
2577
2578                 m_at = m;
2579                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2580                         m_at = SCTP_BUF_NEXT(m_at);
2581                 }
2582                 SCTP_BUF_NEXT(m_at) = m_sig;
2583         }
2584
2585         if (cookie_ok == 0) {
2586                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2587                 SCTPDBG(SCTP_DEBUG_INPUT2,
2588                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2589                     (uint32_t)offset, cookie_offset, sig_offset);
2590                 return (NULL);
2591         }
2592
2593         /*
2594          * check the cookie timestamps to be sure it's not stale
2595          */
2596         (void)SCTP_GETTIME_TIMEVAL(&now);
2597         /* Expire time is in Ticks, so we convert to seconds */
2598         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2599         time_expires.tv_usec = cookie->time_entered.tv_usec;
2600         if (timevalcmp(&now, &time_expires, >)) {
2601                 /* cookie is stale! */
2602                 struct mbuf *op_err;
2603                 struct sctp_error_stale_cookie *cause;
2604                 struct timeval diff;
2605                 uint32_t staleness;
2606
2607                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2608                     0, M_NOWAIT, 1, MT_DATA);
2609                 if (op_err == NULL) {
2610                         /* FOOBAR */
2611                         return (NULL);
2612                 }
2613                 /* Set the len */
2614                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2615                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2616                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2617                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2618                     (sizeof(uint32_t))));
2619                 diff = now;
2620                 timevalsub(&diff, &time_expires);
2621                 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
2622                         staleness = UINT32_MAX;
2623                 } else {
2624                         staleness = diff.tv_sec * 1000000;
2625                 }
2626                 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
2627                         staleness += diff.tv_usec;
2628                 } else {
2629                         staleness = UINT32_MAX;
2630                 }
2631                 cause->stale_time = htonl(staleness);
2632                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2633                     mflowtype, mflowid, l_inp->fibnum,
2634                     vrf_id, port);
2635                 return (NULL);
2636         }
2637         /*
2638          * Now we must see with the lookup address if we have an existing
2639          * asoc. This will only happen if we were in the COOKIE-WAIT state
2640          * and a INIT collided with us and somewhere the peer sent the
2641          * cookie on another address besides the single address our assoc
2642          * had for him. In this case we will have one of the tie-tags set at
2643          * least AND the address field in the cookie can be used to look it
2644          * up.
2645          */
2646         to = NULL;
2647         switch (cookie->addr_type) {
2648 #ifdef INET6
2649         case SCTP_IPV6_ADDRESS:
2650                 memset(&sin6, 0, sizeof(sin6));
2651                 sin6.sin6_family = AF_INET6;
2652                 sin6.sin6_len = sizeof(sin6);
2653                 sin6.sin6_port = sh->src_port;
2654                 sin6.sin6_scope_id = cookie->scope_id;
2655                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2656                     sizeof(sin6.sin6_addr.s6_addr));
2657                 to = (struct sockaddr *)&sin6;
2658                 break;
2659 #endif
2660 #ifdef INET
2661         case SCTP_IPV4_ADDRESS:
2662                 memset(&sin, 0, sizeof(sin));
2663                 sin.sin_family = AF_INET;
2664                 sin.sin_len = sizeof(sin);
2665                 sin.sin_port = sh->src_port;
2666                 sin.sin_addr.s_addr = cookie->address[0];
2667                 to = (struct sockaddr *)&sin;
2668                 break;
2669 #endif
2670         default:
2671                 /* This should not happen */
2672                 return (NULL);
2673         }
2674         if (*stcb == NULL) {
2675                 /* Yep, lets check */
2676                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2677                 if (*stcb == NULL) {
2678                         /*
2679                          * We should have only got back the same inp. If we
2680                          * got back a different ep we have a problem. The
2681                          * original findep got back l_inp and now
2682                          */
2683                         if (l_inp != *inp_p) {
2684                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2685                         }
2686                 } else {
2687                         if (*locked_tcb == NULL) {
2688                                 /*
2689                                  * In this case we found the assoc only
2690                                  * after we locked the create lock. This
2691                                  * means we are in a colliding case and we
2692                                  * must make sure that we unlock the tcb if
2693                                  * its one of the cases where we throw away
2694                                  * the incoming packets.
2695                                  */
2696                                 *locked_tcb = *stcb;
2697
2698                                 /*
2699                                  * We must also increment the inp ref count
2700                                  * since the ref_count flags was set when we
2701                                  * did not find the TCB, now we found it
2702                                  * which reduces the refcount.. we must
2703                                  * raise it back out to balance it all :-)
2704                                  */
2705                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2706                                 if ((*stcb)->sctp_ep != l_inp) {
2707                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2708                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2709                                 }
2710                         }
2711                 }
2712         }
2713
2714         cookie_len -= SCTP_SIGNATURE_SIZE;
2715         if (*stcb == NULL) {
2716                 /* this is the "normal" case... get a new TCB */
2717                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2718                     cookie, cookie_len, *inp_p,
2719                     netp, to, &notification,
2720                     auth_skipped, auth_offset, auth_len,
2721                     mflowtype, mflowid,
2722                     vrf_id, port);
2723         } else {
2724                 /* this is abnormal... cookie-echo on existing TCB */
2725                 had_a_existing_tcb = 1;
2726                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2727                     src, dst, sh,
2728                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2729                     &notification, auth_skipped, auth_offset, auth_len,
2730                     mflowtype, mflowid,
2731                     vrf_id, port);
2732         }
2733
2734         if (*stcb == NULL) {
2735                 /* still no TCB... must be bad cookie-echo */
2736                 return (NULL);
2737         }
2738         if (*netp != NULL) {
2739                 (*netp)->flowtype = mflowtype;
2740                 (*netp)->flowid = mflowid;
2741         }
2742         /*
2743          * Ok, we built an association so confirm the address we sent the
2744          * INIT-ACK to.
2745          */
2746         netl = sctp_findnet(*stcb, to);
2747         /*
2748          * This code should in theory NOT run but
2749          */
2750         if (netl == NULL) {
2751                 /* TSNH! Huh, why do I need to add this address here? */
2752                 if (sctp_add_remote_addr(*stcb, to, NULL, port,
2753                     SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2754                         return (NULL);
2755                 }
2756                 netl = sctp_findnet(*stcb, to);
2757         }
2758         if (netl) {
2759                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2760                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2761                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2762                             netl);
2763                         send_int_conf = 1;
2764                 }
2765         }
2766         sctp_start_net_timers(*stcb);
2767         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2768                 if (!had_a_existing_tcb ||
2769                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2770                         /*
2771                          * If we have a NEW cookie or the connect never
2772                          * reached the connected state during collision we
2773                          * must do the TCP accept thing.
2774                          */
2775                         struct socket *so, *oso;
2776                         struct sctp_inpcb *inp;
2777
2778                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2779                                 /*
2780                                  * For a restart we will keep the same
2781                                  * socket, no need to do anything. I THINK!!
2782                                  */
2783                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2784                                 if (send_int_conf) {
2785                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2786                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2787                                 }
2788                                 return (m);
2789                         }
2790                         oso = (*inp_p)->sctp_socket;
2791                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2792                         SCTP_TCB_UNLOCK((*stcb));
2793                         CURVNET_SET(oso->so_vnet);
2794                         so = sonewconn(oso, 0
2795                             );
2796                         CURVNET_RESTORE();
2797                         SCTP_TCB_LOCK((*stcb));
2798                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2799
2800                         if (so == NULL) {
2801                                 struct mbuf *op_err;
2802 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2803                                 struct socket *pcb_so;
2804 #endif
2805                                 /* Too many sockets */
2806                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2807                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2808                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2809                                     src, dst, sh, op_err,
2810                                     mflowtype, mflowid,
2811                                     vrf_id, port);
2812 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2813                                 pcb_so = SCTP_INP_SO(*inp_p);
2814                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2815                                 SCTP_TCB_UNLOCK((*stcb));
2816                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2817                                 SCTP_TCB_LOCK((*stcb));
2818                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2819 #endif
2820                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2821                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2822 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2823                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2824 #endif
2825                                 return (NULL);
2826                         }
2827                         inp = (struct sctp_inpcb *)so->so_pcb;
2828                         SCTP_INP_INCR_REF(inp);
2829                         /*
2830                          * We add the unbound flag here so that if we get an
2831                          * soabort() before we get the move_pcb done, we
2832                          * will properly cleanup.
2833                          */
2834                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2835                             SCTP_PCB_FLAGS_CONNECTED |
2836                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2837                             SCTP_PCB_FLAGS_UNBOUND |
2838                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2839                             SCTP_PCB_FLAGS_DONT_WAKE);
2840                         inp->sctp_features = (*inp_p)->sctp_features;
2841                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2842                         inp->sctp_socket = so;
2843                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2844                         inp->max_cwnd = (*inp_p)->max_cwnd;
2845                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2846                         inp->ecn_supported = (*inp_p)->ecn_supported;
2847                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2848                         inp->auth_supported = (*inp_p)->auth_supported;
2849                         inp->asconf_supported = (*inp_p)->asconf_supported;
2850                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2851                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2852                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2853                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2854                         inp->sctp_context = (*inp_p)->sctp_context;
2855                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2856                         inp->fibnum = (*inp_p)->fibnum;
2857                         inp->inp_starting_point_for_iterator = NULL;
2858                         /*
2859                          * copy in the authentication parameters from the
2860                          * original endpoint
2861                          */
2862                         if (inp->sctp_ep.local_hmacs)
2863                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2864                         inp->sctp_ep.local_hmacs =
2865                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2866                         if (inp->sctp_ep.local_auth_chunks)
2867                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2868                         inp->sctp_ep.local_auth_chunks =
2869                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2870
2871                         /*
2872                          * Now we must move it from one hash table to
2873                          * another and get the tcb in the right place.
2874                          */
2875
2876                         /*
2877                          * This is where the one-2-one socket is put into
2878                          * the accept state waiting for the accept!
2879                          */
2880                         if (*stcb) {
2881                                 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
2882                         }
2883                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2884
2885                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2886                         SCTP_TCB_UNLOCK((*stcb));
2887
2888                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2889                             0);
2890                         SCTP_TCB_LOCK((*stcb));
2891                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2892
2893
2894                         /*
2895                          * now we must check to see if we were aborted while
2896                          * the move was going on and the lock/unlock
2897                          * happened.
2898                          */
2899                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2900                                 /*
2901                                  * yep it was, we leave the assoc attached
2902                                  * to the socket since the sctp_inpcb_free()
2903                                  * call will send an abort for us.
2904                                  */
2905                                 SCTP_INP_DECR_REF(inp);
2906                                 return (NULL);
2907                         }
2908                         SCTP_INP_DECR_REF(inp);
2909                         /* Switch over to the new guy */
2910                         *inp_p = inp;
2911                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2912                         if (send_int_conf) {
2913                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2914                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2915                         }
2916
2917                         /*
2918                          * Pull it from the incomplete queue and wake the
2919                          * guy
2920                          */
2921 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2922                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2923                         SCTP_TCB_UNLOCK((*stcb));
2924                         SCTP_SOCKET_LOCK(so, 1);
2925 #endif
2926                         soisconnected(so);
2927 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2928                         SCTP_TCB_LOCK((*stcb));
2929                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2930                         SCTP_SOCKET_UNLOCK(so, 1);
2931 #endif
2932                         return (m);
2933                 }
2934         }
2935         if (notification) {
2936                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2937         }
2938         if (send_int_conf) {
2939                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2940                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2941         }
2942         return (m);
2943 }
2944
2945 static void
2946 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2947     struct sctp_tcb *stcb, struct sctp_nets *net)
2948 {
2949         /* cp must not be used, others call this without a c-ack :-) */
2950         struct sctp_association *asoc;
2951
2952         SCTPDBG(SCTP_DEBUG_INPUT2,
2953             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2954         if ((stcb == NULL) || (net == NULL)) {
2955                 return;
2956         }
2957
2958         asoc = &stcb->asoc;
2959         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
2960                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
2961                     asoc->overall_error_count,
2962                     0,
2963                     SCTP_FROM_SCTP_INPUT,
2964                     __LINE__);
2965         }
2966         asoc->overall_error_count = 0;
2967         sctp_stop_all_cookie_timers(stcb);
2968         /* process according to association state */
2969         if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
2970                 /* state change only needed when I am in right state */
2971                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2972                 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
2973                 sctp_start_net_timers(stcb);
2974                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2975                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2976                             stcb->sctp_ep, stcb, asoc->primary_destination);
2977
2978                 }
2979                 /* update RTO */
2980                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2981                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2982                 if (asoc->overall_error_count == 0) {
2983                         sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
2984                             SCTP_RTT_FROM_NON_DATA);
2985                 }
2986                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2987                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2988                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2989                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2990 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2991                         struct socket *so;
2992
2993 #endif
2994                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2995 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2996                         so = SCTP_INP_SO(stcb->sctp_ep);
2997                         atomic_add_int(&stcb->asoc.refcnt, 1);
2998                         SCTP_TCB_UNLOCK(stcb);
2999                         SCTP_SOCKET_LOCK(so, 1);
3000                         SCTP_TCB_LOCK(stcb);
3001                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3002 #endif
3003                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
3004                                 soisconnected(stcb->sctp_socket);
3005                         }
3006 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3007                         SCTP_SOCKET_UNLOCK(so, 1);
3008 #endif
3009                 }
3010                 /*
3011                  * since we did not send a HB make sure we don't double
3012                  * things
3013                  */
3014                 net->hb_responded = 1;
3015
3016                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
3017                         /*
3018                          * We don't need to do the asconf thing, nor hb or
3019                          * autoclose if the socket is closed.
3020                          */
3021                         goto closed_socket;
3022                 }
3023
3024                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
3025                     stcb, net);
3026
3027
3028                 if (stcb->asoc.sctp_autoclose_ticks &&
3029                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
3030                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
3031                             stcb->sctp_ep, stcb, NULL);
3032                 }
3033                 /*
3034                  * send ASCONF if parameters are pending and ASCONFs are
3035                  * allowed (eg. addresses changed when init/cookie echo were
3036                  * in flight)
3037                  */
3038                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
3039                     (stcb->asoc.asconf_supported == 1) &&
3040                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
3041 #ifdef SCTP_TIMER_BASED_ASCONF
3042                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
3043                             stcb->sctp_ep, stcb,
3044                             stcb->asoc.primary_destination);
3045 #else
3046                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3047                             SCTP_ADDR_NOT_LOCKED);
3048 #endif
3049                 }
3050         }
3051 closed_socket:
3052         /* Toss the cookie if I can */
3053         sctp_toss_old_cookies(stcb, asoc);
3054         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3055                 /* Restart the timer if we have pending data */
3056                 struct sctp_tmit_chunk *chk;
3057
3058                 chk = TAILQ_FIRST(&asoc->sent_queue);
3059                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3060         }
3061 }
3062
3063 static void
3064 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3065     struct sctp_tcb *stcb)
3066 {
3067         struct sctp_nets *net;
3068         struct sctp_tmit_chunk *lchk;
3069         struct sctp_ecne_chunk bkup;
3070         uint8_t override_bit;
3071         uint32_t tsn, window_data_tsn;
3072         int len;
3073         unsigned int pkt_cnt;
3074
3075         len = ntohs(cp->ch.chunk_length);
3076         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3077             (len != sizeof(struct old_sctp_ecne_chunk))) {
3078                 return;
3079         }
3080         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3081                 /* Its the old format */
3082                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3083                 bkup.num_pkts_since_cwr = htonl(1);
3084                 cp = &bkup;
3085         }
3086         SCTP_STAT_INCR(sctps_recvecne);
3087         tsn = ntohl(cp->tsn);
3088         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3089         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3090         if (lchk == NULL) {
3091                 window_data_tsn = stcb->asoc.sending_seq - 1;
3092         } else {
3093                 window_data_tsn = lchk->rec.data.tsn;
3094         }
3095
3096         /* Find where it was sent to if possible. */
3097         net = NULL;
3098         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3099                 if (lchk->rec.data.tsn == tsn) {
3100                         net = lchk->whoTo;
3101                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3102                         break;
3103                 }
3104                 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
3105                         break;
3106                 }
3107         }
3108         if (net == NULL) {
3109                 /*
3110                  * What to do. A previous send of a CWR was possibly lost.
3111                  * See how old it is, we may have it marked on the actual
3112                  * net.
3113                  */
3114                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3115                         if (tsn == net->last_cwr_tsn) {
3116                                 /* Found him, send it off */
3117                                 break;
3118                         }
3119                 }
3120                 if (net == NULL) {
3121                         /*
3122                          * If we reach here, we need to send a special CWR
3123                          * that says hey, we did this a long time ago and
3124                          * you lost the response.
3125                          */
3126                         net = TAILQ_FIRST(&stcb->asoc.nets);
3127                         if (net == NULL) {
3128                                 /* TSNH */
3129                                 return;
3130                         }
3131                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3132                 } else {
3133                         override_bit = 0;
3134                 }
3135         } else {
3136                 override_bit = 0;
3137         }
3138         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3139             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3140                 /*
3141                  * JRS - Use the congestion control given in the pluggable
3142                  * CC module
3143                  */
3144                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3145                 /*
3146                  * We reduce once every RTT. So we will only lower cwnd at
3147                  * the next sending seq i.e. the window_data_tsn
3148                  */
3149                 net->cwr_window_tsn = window_data_tsn;
3150                 net->ecn_ce_pkt_cnt += pkt_cnt;
3151                 net->lost_cnt = pkt_cnt;
3152                 net->last_cwr_tsn = tsn;
3153         } else {
3154                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3155                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3156                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3157                         /*
3158                          * Another loss in the same window update how many
3159                          * marks/packets lost we have had.
3160                          */
3161                         int cnt = 1;
3162
3163                         if (pkt_cnt > net->lost_cnt) {
3164                                 /* Should be the case */
3165                                 cnt = (pkt_cnt - net->lost_cnt);
3166                                 net->ecn_ce_pkt_cnt += cnt;
3167                         }
3168                         net->lost_cnt = pkt_cnt;
3169                         net->last_cwr_tsn = tsn;
3170                         /*
3171                          * Most CC functions will ignore this call, since we
3172                          * are in-window yet of the initial CE the peer saw.
3173                          */
3174                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3175                 }
3176         }
3177         /*
3178          * We always send a CWR this way if our previous one was lost our
3179          * peer will get an update, or if it is not time again to reduce we
3180          * still get the cwr to the peer. Note we set the override when we
3181          * could not find the TSN on the chunk or the destination network.
3182          */
3183         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3184 }
3185
3186 static void
3187 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3188 {
3189         /*
3190          * Here we get a CWR from the peer. We must look in the outqueue and
3191          * make sure that we have a covered ECNE in the control chunk part.
3192          * If so remove it.
3193          */
3194         struct sctp_tmit_chunk *chk, *nchk;
3195         struct sctp_ecne_chunk *ecne;
3196         int override;
3197         uint32_t cwr_tsn;
3198
3199         cwr_tsn = ntohl(cp->tsn);
3200         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3201         TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
3202                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3203                         continue;
3204                 }
3205                 if ((override == 0) && (chk->whoTo != net)) {
3206                         /* Must be from the right src unless override is set */
3207                         continue;
3208                 }
3209                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3210                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3211                         /* this covers this ECNE, we can remove it */
3212                         stcb->asoc.ecn_echo_cnt_onq--;
3213                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3214                             sctp_next);
3215                         stcb->asoc.ctrl_queue_cnt--;
3216                         sctp_m_freem(chk->data);
3217                         chk->data = NULL;
3218                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3219                         if (override == 0) {
3220                                 break;
3221                         }
3222                 }
3223         }
3224 }
3225
3226 static void
3227 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3228     struct sctp_tcb *stcb, struct sctp_nets *net)
3229 {
3230 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3231         struct socket *so;
3232 #endif
3233
3234         SCTPDBG(SCTP_DEBUG_INPUT2,
3235             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3236         if (stcb == NULL)
3237                 return;
3238
3239         /* process according to association state */
3240         if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3241                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3242                 SCTPDBG(SCTP_DEBUG_INPUT2,
3243                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3244                 SCTP_TCB_UNLOCK(stcb);
3245                 return;
3246         }
3247         /* notify upper layer protocol */
3248         if (stcb->sctp_socket) {
3249                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3250         }
3251 #ifdef INVARIANTS
3252         if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
3253             !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
3254             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
3255                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3256         }
3257 #endif
3258         /* stop the timer */
3259         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3260             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3261         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3262         /* free the TCB */
3263         SCTPDBG(SCTP_DEBUG_INPUT2,
3264             "sctp_handle_shutdown_complete: calls free-asoc\n");
3265 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3266         so = SCTP_INP_SO(stcb->sctp_ep);
3267         atomic_add_int(&stcb->asoc.refcnt, 1);
3268         SCTP_TCB_UNLOCK(stcb);
3269         SCTP_SOCKET_LOCK(so, 1);
3270         SCTP_TCB_LOCK(stcb);
3271         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3272 #endif
3273         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3274             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3275 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3276         SCTP_SOCKET_UNLOCK(so, 1);
3277 #endif
3278         return;
3279 }
3280
3281 static int
3282 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3283     struct sctp_nets *net, uint8_t flg)
3284 {
3285         switch (desc->chunk_type) {
3286         case SCTP_DATA:
3287                 /* find the tsn to resend (possibly */
3288                 {
3289                         uint32_t tsn;
3290                         struct sctp_tmit_chunk *tp1;
3291
3292                         tsn = ntohl(desc->tsn_ifany);
3293                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3294                                 if (tp1->rec.data.tsn == tsn) {
3295                                         /* found it */
3296                                         break;
3297                                 }
3298                                 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
3299                                         /* not found */
3300                                         tp1 = NULL;
3301                                         break;
3302                                 }
3303                         }
3304                         if (tp1 == NULL) {
3305                                 /*
3306                                  * Do it the other way , aka without paying
3307                                  * attention to queue seq order.
3308                                  */
3309                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3310                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3311                                         if (tp1->rec.data.tsn == tsn) {
3312                                                 /* found it */
3313                                                 break;
3314                                         }
3315                                 }
3316                         }
3317                         if (tp1 == NULL) {
3318                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3319                         }
3320                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3321                                 uint8_t *ddp;
3322
3323                                 if (((flg & SCTP_BADCRC) == 0) &&
3324                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3325                                         return (0);
3326                                 }
3327                                 if ((stcb->asoc.peers_rwnd == 0) &&
3328                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3329                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3330                                         return (0);
3331                                 }
3332                                 if (stcb->asoc.peers_rwnd == 0 &&
3333                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3334                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3335                                         return (0);
3336                                 }
3337                                 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+
3338                                     sizeof(struct sctp_data_chunk));
3339                                 {
3340                                         unsigned int iii;
3341
3342                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3343                                             iii++) {
3344                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3345                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3346                                                         return (-1);
3347                                                 }
3348                                         }
3349                                 }
3350
3351                                 if (tp1->do_rtt) {
3352                                         /*
3353                                          * this guy had a RTO calculation
3354                                          * pending on it, cancel it
3355                                          */
3356                                         if (tp1->whoTo->rto_needed == 0) {
3357                                                 tp1->whoTo->rto_needed = 1;
3358                                         }
3359                                         tp1->do_rtt = 0;
3360                                 }
3361                                 SCTP_STAT_INCR(sctps_pdrpmark);
3362                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3363                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3364                                 /*
3365                                  * mark it as if we were doing a FR, since
3366                                  * we will be getting gap ack reports behind
3367                                  * the info from the router.
3368                                  */
3369                                 tp1->rec.data.doing_fast_retransmit = 1;
3370                                 /*
3371                                  * mark the tsn with what sequences can
3372                                  * cause a new FR.
3373                                  */
3374                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3375                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3376                                 } else {
3377                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
3378                                 }
3379
3380                                 /* restart the timer */
3381                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3382                                     stcb, tp1->whoTo,
3383                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3384                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3385                                     stcb, tp1->whoTo);
3386
3387                                 /* fix counts and things */
3388                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3389                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3390                                             tp1->whoTo->flight_size,
3391                                             tp1->book_size,
3392                                             (uint32_t)(uintptr_t)stcb,
3393                                             tp1->rec.data.tsn);
3394                                 }
3395                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3396                                         sctp_flight_size_decrease(tp1);
3397                                         sctp_total_flight_decrease(stcb, tp1);
3398                                 }
3399                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3400                         } {
3401                                 /* audit code */
3402                                 unsigned int audit;
3403
3404                                 audit = 0;
3405                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3406                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3407                                                 audit++;
3408                                 }
3409                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3410                                     sctp_next) {
3411                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3412                                                 audit++;
3413                                 }
3414                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3415                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3416                                             audit, stcb->asoc.sent_queue_retran_cnt);
3417 #ifndef SCTP_AUDITING_ENABLED
3418                                         stcb->asoc.sent_queue_retran_cnt = audit;
3419 #endif
3420                                 }
3421                         }
3422                 }
3423                 break;
3424         case SCTP_ASCONF:
3425                 {
3426                         struct sctp_tmit_chunk *asconf;
3427
3428                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3429                             sctp_next) {
3430                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3431                                         break;
3432                                 }
3433                         }
3434                         if (asconf) {
3435                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3436                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3437                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3438                                 asconf->snd_count--;
3439                         }
3440                 }
3441                 break;
3442         case SCTP_INITIATION:
3443                 /* resend the INIT */
3444                 stcb->asoc.dropped_special_cnt++;
3445                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3446                         /*
3447                          * If we can get it in, in a few attempts we do
3448                          * this, otherwise we let the timer fire.
3449                          */
3450                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3451                             stcb, net,
3452                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3453                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3454                 }
3455                 break;
3456         case SCTP_SELECTIVE_ACK:
3457         case SCTP_NR_SELECTIVE_ACK:
3458                 /* resend the sack */
3459                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3460                 break;
3461         case SCTP_HEARTBEAT_REQUEST:
3462                 /* resend a demand HB */
3463                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3464                         /*
3465                          * Only retransmit if we KNOW we wont destroy the
3466                          * tcb
3467                          */
3468                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3469                 }
3470                 break;
3471         case SCTP_SHUTDOWN:
3472                 sctp_send_shutdown(stcb, net);
3473                 break;
3474         case SCTP_SHUTDOWN_ACK:
3475                 sctp_send_shutdown_ack(stcb, net);
3476                 break;
3477         case SCTP_COOKIE_ECHO:
3478                 {
3479                         struct sctp_tmit_chunk *cookie;
3480
3481                         cookie = NULL;
3482                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3483                             sctp_next) {
3484                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3485                                         break;
3486                                 }
3487                         }
3488                         if (cookie) {
3489                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3490                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3491                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3492                                 sctp_stop_all_cookie_timers(stcb);
3493                         }
3494                 }
3495                 break;
3496         case SCTP_COOKIE_ACK:
3497                 sctp_send_cookie_ack(stcb);
3498                 break;
3499         case SCTP_ASCONF_ACK:
3500                 /* resend last asconf ack */
3501                 sctp_send_asconf_ack(stcb);
3502                 break;
3503         case SCTP_IFORWARD_CUM_TSN:
3504         case SCTP_FORWARD_CUM_TSN:
3505                 send_forward_tsn(stcb, &stcb->asoc);
3506                 break;
3507                 /* can't do anything with these */
3508         case SCTP_PACKET_DROPPED:
3509         case SCTP_INITIATION_ACK:       /* this should not happen */
3510         case SCTP_HEARTBEAT_ACK:
3511         case SCTP_ABORT_ASSOCIATION:
3512         case SCTP_OPERATION_ERROR:
3513         case SCTP_SHUTDOWN_COMPLETE:
3514         case SCTP_ECN_ECHO:
3515         case SCTP_ECN_CWR:
3516         default:
3517                 break;
3518         }
3519         return (0);
3520 }
3521
3522 void
3523 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3524 {
3525         uint32_t i;
3526         uint16_t temp;
3527
3528         /*
3529          * We set things to 0xffffffff since this is the last delivered
3530          * sequence and we will be sending in 0 after the reset.
3531          */
3532
3533         if (number_entries) {
3534                 for (i = 0; i < number_entries; i++) {
3535                         temp = ntohs(list[i]);
3536                         if (temp >= stcb->asoc.streamincnt) {
3537                                 continue;
3538                         }
3539                         stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
3540                 }
3541         } else {
3542                 list = NULL;
3543                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3544                         stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
3545                 }
3546         }
3547         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3548 }
3549
3550 static void
3551 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3552 {
3553         uint32_t i;
3554         uint16_t temp;
3555
3556         if (number_entries > 0) {
3557                 for (i = 0; i < number_entries; i++) {
3558                         temp = ntohs(list[i]);
3559                         if (temp >= stcb->asoc.streamoutcnt) {
3560                                 /* no such stream */
3561                                 continue;
3562                         }
3563                         stcb->asoc.strmout[temp].next_mid_ordered = 0;
3564                         stcb->asoc.strmout[temp].next_mid_unordered = 0;
3565                 }
3566         } else {
3567                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3568                         stcb->asoc.strmout[i].next_mid_ordered = 0;
3569                         stcb->asoc.strmout[i].next_mid_unordered = 0;
3570                 }
3571         }
3572         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3573 }
3574
3575 static void
3576 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
3577 {
3578         uint32_t i;
3579         uint16_t temp;
3580
3581         if (number_entries > 0) {
3582                 for (i = 0; i < number_entries; i++) {
3583                         temp = ntohs(list[i]);
3584                         if (temp >= stcb->asoc.streamoutcnt) {
3585                                 /* no such stream */
3586                                 continue;
3587                         }
3588                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3589                 }
3590         } else {
3591                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3592                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3593                 }
3594         }
3595 }
3596
3597
3598 struct sctp_stream_reset_request *
3599 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3600 {
3601         struct sctp_association *asoc;
3602         struct sctp_chunkhdr *ch;
3603         struct sctp_stream_reset_request *r;
3604         struct sctp_tmit_chunk *chk;
3605         int len, clen;
3606
3607         asoc = &stcb->asoc;
3608         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3609                 asoc->stream_reset_outstanding = 0;
3610                 return (NULL);
3611         }
3612         if (stcb->asoc.str_reset == NULL) {
3613                 asoc->stream_reset_outstanding = 0;
3614                 return (NULL);
3615         }
3616         chk = stcb->asoc.str_reset;
3617         if (chk->data == NULL) {
3618                 return (NULL);
3619         }
3620         if (bchk) {
3621                 /* he wants a copy of the chk pointer */
3622                 *bchk = chk;
3623         }
3624         clen = chk->send_size;
3625         ch = mtod(chk->data, struct sctp_chunkhdr *);
3626         r = (struct sctp_stream_reset_request *)(ch + 1);
3627         if (ntohl(r->request_seq) == seq) {
3628                 /* found it */
3629                 return (r);
3630         }
3631         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3632         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3633                 /* move to the next one, there can only be a max of two */
3634                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3635                 if (ntohl(r->request_seq) == seq) {
3636                         return (r);
3637                 }
3638         }
3639         /* that seq is not here */
3640         return (NULL);
3641 }
3642
3643 static void
3644 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3645 {
3646         struct sctp_association *asoc;
3647         struct sctp_tmit_chunk *chk;
3648
3649         asoc = &stcb->asoc;
3650         chk = asoc->str_reset;
3651         if (chk == NULL) {
3652                 return;
3653         }
3654         asoc->str_reset = NULL;
3655         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3656             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3657         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
3658         asoc->ctrl_queue_cnt--;
3659         if (chk->data) {
3660                 sctp_m_freem(chk->data);
3661                 chk->data = NULL;
3662         }
3663         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3664 }
3665
3666
3667 static int
3668 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3669     uint32_t seq, uint32_t action,
3670     struct sctp_stream_reset_response *respin)
3671 {
3672         uint16_t type;
3673         int lparam_len;
3674         struct sctp_association *asoc = &stcb->asoc;
3675         struct sctp_tmit_chunk *chk;
3676         struct sctp_stream_reset_request *req_param;
3677         struct sctp_stream_reset_out_request *req_out_param;
3678         struct sctp_stream_reset_in_request *req_in_param;
3679         uint32_t number_entries;
3680
3681         if (asoc->stream_reset_outstanding == 0) {
3682                 /* duplicate */
3683                 return (0);
3684         }
3685         if (seq == stcb->asoc.str_reset_seq_out) {
3686                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3687                 if (req_param != NULL) {
3688                         stcb->asoc.str_reset_seq_out++;
3689                         type = ntohs(req_param->ph.param_type);
3690                         lparam_len = ntohs(req_param->ph.param_length);
3691                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3692                                 int no_clear = 0;
3693
3694                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3695                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3696                                 asoc->stream_reset_out_is_outstanding = 0;
3697                                 if (asoc->stream_reset_outstanding)
3698                                         asoc->stream_reset_outstanding--;
3699                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3700                                         /* do it */
3701                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3702                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3703                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3704                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3705                                         /*
3706                                          * Set it up so we don't stop
3707                                          * retransmitting
3708                                          */
3709                                         asoc->stream_reset_outstanding++;
3710                                         stcb->asoc.str_reset_seq_out--;
3711                                         asoc->stream_reset_out_is_outstanding = 1;
3712                                         no_clear = 1;
3713                                 } else {
3714                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3715                                 }
3716                                 if (no_clear == 0) {
3717                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3718                                 }
3719                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3720                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3721                                 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3722                                 if (asoc->stream_reset_outstanding)
3723                                         asoc->stream_reset_outstanding--;
3724                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3725                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3726                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3727                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3728                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3729                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3730                                 }
3731                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3732                                 /* Ok we now may have more streams */
3733                                 int num_stream;
3734
3735                                 num_stream = stcb->asoc.strm_pending_add_size;
3736                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3737                                         /* TSNH */
3738                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3739                                 }
3740                                 stcb->asoc.strm_pending_add_size = 0;
3741                                 if (asoc->stream_reset_outstanding)
3742                                         asoc->stream_reset_outstanding--;
3743                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3744                                         /* Put the new streams into effect */
3745                                         int i;
3746
3747                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3748                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3749                                         }
3750                                         asoc->streamoutcnt += num_stream;
3751                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3752                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3753                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3754                                             SCTP_STREAM_CHANGE_DENIED);
3755                                 } else {
3756                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3757                                             SCTP_STREAM_CHANGE_FAILED);
3758                                 }
3759                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3760                                 if (asoc->stream_reset_outstanding)
3761                                         asoc->stream_reset_outstanding--;
3762                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3763                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3764                                             SCTP_STREAM_CHANGE_DENIED);
3765                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3766                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3767                                             SCTP_STREAM_CHANGE_FAILED);
3768                                 }
3769                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3770                                 /**
3771                                  * a) Adopt the new in tsn.
3772                                  * b) reset the map
3773                                  * c) Adopt the new out-tsn
3774                                  */
3775                                 struct sctp_stream_reset_response_tsn *resp;
3776                                 struct sctp_forward_tsn_chunk fwdtsn;
3777                                 int abort_flag = 0;
3778
3779                                 if (respin == NULL) {
3780                                         /* huh ? */
3781                                         return (0);
3782                                 }
3783                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3784                                         return (0);
3785                                 }
3786                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3787                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3788                                         asoc->stream_reset_outstanding--;
3789                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3790                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3791                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3792                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3793                                         if (abort_flag) {
3794                                                 return (1);
3795                                         }
3796                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3797                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3798                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3799                                         }
3800
3801                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3802                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3803                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3804
3805                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3806                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3807
3808                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3809                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3810
3811                                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3812                                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3813                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3814                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3815                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3816                                             SCTP_ASSOC_RESET_DENIED);
3817                                 } else {
3818                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3819                                             SCTP_ASSOC_RESET_FAILED);
3820                                 }
3821                         }
3822                         /* get rid of the request and get the request flags */
3823                         if (asoc->stream_reset_outstanding == 0) {
3824                                 sctp_clean_up_stream_reset(stcb);
3825                         }
3826                 }
3827         }
3828         if (asoc->stream_reset_outstanding == 0) {
3829                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3830         }
3831         return (0);
3832 }
3833
3834 static void
3835 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3836     struct sctp_tmit_chunk *chk,
3837     struct sctp_stream_reset_in_request *req, int trunc)
3838 {
3839         uint32_t seq;
3840         int len, i;
3841         int number_entries;
3842         uint16_t temp;
3843
3844         /*
3845          * peer wants me to send a str-reset to him for my outgoing seq's if
3846          * seq_in is right.
3847          */
3848         struct sctp_association *asoc = &stcb->asoc;
3849
3850         seq = ntohl(req->request_seq);
3851         if (asoc->str_reset_seq_in == seq) {
3852                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3853                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3854                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3855                 } else if (trunc) {
3856                         /* Can't do it, since they exceeded our buffer size  */
3857                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3858                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3859                         len = ntohs(req->ph.param_length);
3860                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3861                         if (number_entries) {
3862                                 for (i = 0; i < number_entries; i++) {
3863                                         temp = ntohs(req->list_of_streams[i]);
3864                                         if (temp >= stcb->asoc.streamoutcnt) {
3865                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3866                                                 goto bad_boy;
3867                                         }
3868                                         req->list_of_streams[i] = temp;
3869                                 }
3870                                 for (i = 0; i < number_entries; i++) {
3871                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3872                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3873                                         }
3874                                 }
3875                         } else {
3876                                 /* Its all */
3877                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3878                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3879                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3880                                 }
3881                         }
3882                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3883                 } else {
3884                         /* Can't do it, since we have sent one out */
3885                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3886                 }
3887 bad_boy:
3888                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3889                 asoc->str_reset_seq_in++;
3890         } else if (asoc->str_reset_seq_in - 1 == seq) {
3891                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3892         } else if (asoc->str_reset_seq_in - 2 == seq) {
3893                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3894         } else {
3895                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3896         }
3897         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3898 }
3899
3900 static int
3901 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3902     struct sctp_tmit_chunk *chk,
3903     struct sctp_stream_reset_tsn_request *req)
3904 {
3905         /* reset all in and out and update the tsn */
3906         /*
3907          * A) reset my str-seq's on in and out. B) Select a receive next,
3908          * and set cum-ack to it. Also process this selected number as a
3909          * fwd-tsn as well. C) set in the response my next sending seq.
3910          */
3911         struct sctp_forward_tsn_chunk fwdtsn;
3912         struct sctp_association *asoc = &stcb->asoc;
3913         int abort_flag = 0;
3914         uint32_t seq;
3915
3916         seq = ntohl(req->request_seq);
3917         if (asoc->str_reset_seq_in == seq) {
3918                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3919                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3920                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3921                 } else {
3922                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3923                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3924                         fwdtsn.ch.chunk_flags = 0;
3925                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3926                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3927                         if (abort_flag) {
3928                                 return (1);
3929                         }
3930                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3931                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3932                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3933                         }
3934                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3935                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3936                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3937                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3938                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3939                         atomic_add_int(&asoc->sending_seq, 1);
3940                         /* save off historical data for retrans */
3941                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3942                         asoc->last_sending_seq[0] = asoc->sending_seq;
3943                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3944                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3945                         sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL);
3946                         sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL);
3947                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3948                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3949                 }
3950                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3951                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3952                 asoc->str_reset_seq_in++;
3953         } else if (asoc->str_reset_seq_in - 1 == seq) {
3954                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3955                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3956         } else if (asoc->str_reset_seq_in - 2 == seq) {
3957                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3958                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3959         } else {
3960                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3961         }
3962         return (0);
3963 }
3964
3965 static void
3966 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3967     struct sctp_tmit_chunk *chk,
3968     struct sctp_stream_reset_out_request *req, int trunc)
3969 {
3970         uint32_t seq, tsn;
3971         int number_entries, len;
3972         struct sctp_association *asoc = &stcb->asoc;
3973
3974         seq = ntohl(req->request_seq);
3975
3976         /* now if its not a duplicate we process it */
3977         if (asoc->str_reset_seq_in == seq) {
3978                 len = ntohs(req->ph.param_length);
3979                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3980                 /*
3981                  * the sender is resetting, handle the list issue.. we must
3982                  * a) verify if we can do the reset, if so no problem b) If
3983                  * we can't do the reset we must copy the request. c) queue
3984                  * it, and setup the data in processor to trigger it off
3985                  * when needed and dequeue all the queued data.
3986                  */
3987                 tsn = ntohl(req->send_reset_at_tsn);
3988
3989                 /* move the reset action back one */
3990                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3991                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3992                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3993                 } else if (trunc) {
3994                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3995                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3996                         /* we can do it now */
3997                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3998                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3999                 } else {
4000                         /*
4001                          * we must queue it up and thus wait for the TSN's
4002                          * to arrive that are at or before tsn
4003                          */
4004                         struct sctp_stream_reset_list *liste;
4005                         int siz;
4006
4007                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
4008                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
4009                             siz, SCTP_M_STRESET);
4010                         if (liste == NULL) {
4011                                 /* gak out of memory */
4012                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4013                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4014                                 return;
4015                         }
4016                         liste->seq = seq;
4017                         liste->tsn = tsn;
4018                         liste->number_entries = number_entries;
4019                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
4020                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
4021                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
4022                 }
4023                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4024                 asoc->str_reset_seq_in++;
4025         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4026                 /*
4027                  * one seq back, just echo back last action since my
4028                  * response was lost.
4029                  */
4030                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4031         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4032                 /*
4033                  * two seq back, just echo back last action since my
4034                  * response was lost.
4035                  */
4036                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4037         } else {
4038                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4039         }
4040 }
4041
4042 static void
4043 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4044     struct sctp_stream_reset_add_strm *str_add)
4045 {
4046         /*
4047          * Peer is requesting to add more streams. If its within our
4048          * max-streams we will allow it.
4049          */
4050         uint32_t num_stream, i;
4051         uint32_t seq;
4052         struct sctp_association *asoc = &stcb->asoc;
4053         struct sctp_queued_to_read *ctl, *nctl;
4054
4055         /* Get the number. */
4056         seq = ntohl(str_add->request_seq);
4057         num_stream = ntohs(str_add->number_of_streams);
4058         /* Now what would be the new total? */
4059         if (asoc->str_reset_seq_in == seq) {
4060                 num_stream += stcb->asoc.streamincnt;
4061                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4062                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4063                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4064                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4065                     (num_stream > 0xffff)) {
4066                         /* We must reject it they ask for to many */
4067         denied:
4068                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4069                 } else {
4070                         /* Ok, we can do that :-) */
4071                         struct sctp_stream_in *oldstrm;
4072
4073                         /* save off the old */
4074                         oldstrm = stcb->asoc.strmin;
4075                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4076                             (num_stream * sizeof(struct sctp_stream_in)),
4077                             SCTP_M_STRMI);
4078                         if (stcb->asoc.strmin == NULL) {
4079                                 stcb->asoc.strmin = oldstrm;
4080                                 goto denied;
4081                         }
4082                         /* copy off the old data */
4083                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4084                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4085                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4086                                 stcb->asoc.strmin[i].sid = i;
4087                                 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
4088                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4089                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
4090                                 /* now anything on those queues? */
4091                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
4092                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
4093                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
4094                                 }
4095                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
4096                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
4097                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
4098                                 }
4099                         }
4100                         /* Init the new streams */
4101                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4102                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4103                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4104                                 stcb->asoc.strmin[i].sid = i;
4105                                 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
4106                                 stcb->asoc.strmin[i].pd_api_started = 0;
4107                                 stcb->asoc.strmin[i].delivery_started = 0;
4108                         }
4109                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4110                         /* update the size */
4111                         stcb->asoc.streamincnt = num_stream;
4112                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4113                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4114                 }
4115                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4116                 asoc->str_reset_seq_in++;
4117         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4118                 /*
4119                  * one seq back, just echo back last action since my
4120                  * response was lost.
4121                  */
4122                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4123         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4124                 /*
4125                  * two seq back, just echo back last action since my
4126                  * response was lost.
4127                  */
4128                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4129         } else {
4130                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4131
4132         }
4133 }
4134
4135 static void
4136 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4137     struct sctp_stream_reset_add_strm *str_add)
4138 {
4139         /*
4140          * Peer is requesting to add more streams. If its within our
4141          * max-streams we will allow it.
4142          */
4143         uint16_t num_stream;
4144         uint32_t seq;
4145         struct sctp_association *asoc = &stcb->asoc;
4146
4147         /* Get the number. */
4148         seq = ntohl(str_add->request_seq);
4149         num_stream = ntohs(str_add->number_of_streams);
4150         /* Now what would be the new total? */
4151         if (asoc->str_reset_seq_in == seq) {
4152                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4153                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4154                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4155                 } else if (stcb->asoc.stream_reset_outstanding) {
4156                         /* We must reject it we have something pending */
4157                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4158                 } else {
4159                         /* Ok, we can do that :-) */
4160                         int mychk;
4161
4162                         mychk = stcb->asoc.streamoutcnt;
4163                         mychk += num_stream;
4164                         if (mychk < 0x10000) {
4165                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4166                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4167                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4168                                 }
4169                         } else {
4170                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4171                         }
4172                 }
4173                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4174                 asoc->str_reset_seq_in++;
4175         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4176                 /*
4177                  * one seq back, just echo back last action since my
4178                  * response was lost.
4179                  */
4180                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4181         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4182                 /*
4183                  * two seq back, just echo back last action since my
4184                  * response was lost.
4185                  */
4186                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4187         } else {
4188                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4189         }
4190 }
4191
4192 #ifdef __GNUC__
4193 __attribute__((noinline))
4194 #endif
4195 static int
4196 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4197     struct sctp_chunkhdr *ch_req)
4198 {
4199         uint16_t remaining_length, param_len, ptype;
4200         struct sctp_paramhdr pstore;
4201         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4202         uint32_t seq = 0;
4203         int num_req = 0;
4204         int trunc = 0;
4205         struct sctp_tmit_chunk *chk;
4206         struct sctp_chunkhdr *ch;
4207         struct sctp_paramhdr *ph;
4208         int ret_code = 0;
4209         int num_param = 0;
4210
4211         /* now it may be a reset or a reset-response */
4212         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4213
4214         /* setup for adding the response */
4215         sctp_alloc_a_chunk(stcb, chk);
4216         if (chk == NULL) {
4217                 return (ret_code);
4218         }
4219         chk->copy_by_ref = 0;
4220         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4221         chk->rec.chunk_id.can_take_data = 0;
4222         chk->flags = 0;
4223         chk->asoc = &stcb->asoc;
4224         chk->no_fr_allowed = 0;
4225         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4226         chk->book_size_scale = 0;
4227         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4228         if (chk->data == NULL) {
4229 strres_nochunk:
4230                 if (chk->data) {
4231                         sctp_m_freem(chk->data);
4232                         chk->data = NULL;
4233                 }
4234                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4235                 return (ret_code);
4236         }
4237         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4238
4239         /* setup chunk parameters */
4240         chk->sent = SCTP_DATAGRAM_UNSENT;
4241         chk->snd_count = 0;
4242         chk->whoTo = NULL;
4243
4244         ch = mtod(chk->data, struct sctp_chunkhdr *);
4245         ch->chunk_type = SCTP_STREAM_RESET;
4246         ch->chunk_flags = 0;
4247         ch->chunk_length = htons(chk->send_size);
4248         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4249         offset += sizeof(struct sctp_chunkhdr);
4250         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4251                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
4252                 if (ph == NULL) {
4253                         /* TSNH */
4254                         break;
4255                 }
4256                 param_len = ntohs(ph->param_length);
4257                 if ((param_len > remaining_length) ||
4258                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4259                         /* bad parameter length */
4260                         break;
4261                 }
4262                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4263                     (uint8_t *)&cstore);
4264                 if (ph == NULL) {
4265                         /* TSNH */
4266                         break;
4267                 }
4268                 ptype = ntohs(ph->param_type);
4269                 num_param++;
4270                 if (param_len > sizeof(cstore)) {
4271                         trunc = 1;
4272                 } else {
4273                         trunc = 0;
4274                 }
4275                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4276                         /* hit the max of parameters already sorry.. */
4277                         break;
4278                 }
4279                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4280                         struct sctp_stream_reset_out_request *req_out;
4281
4282                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4283                                 break;
4284                         }
4285                         req_out = (struct sctp_stream_reset_out_request *)ph;
4286                         num_req++;
4287                         if (stcb->asoc.stream_reset_outstanding) {
4288                                 seq = ntohl(req_out->response_seq);
4289                                 if (seq == stcb->asoc.str_reset_seq_out) {
4290                                         /* implicit ack */
4291                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4292                                 }
4293                         }
4294                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4295                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4296                         struct sctp_stream_reset_add_strm *str_add;
4297
4298                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4299                                 break;
4300                         }
4301                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4302                         num_req++;
4303                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4304                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4305                         struct sctp_stream_reset_add_strm *str_add;
4306
4307                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4308                                 break;
4309                         }
4310                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4311                         num_req++;
4312                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4313                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4314                         struct sctp_stream_reset_in_request *req_in;
4315
4316                         num_req++;
4317                         req_in = (struct sctp_stream_reset_in_request *)ph;
4318                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4319                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4320                         struct sctp_stream_reset_tsn_request *req_tsn;
4321
4322                         num_req++;
4323                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4324                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4325                                 ret_code = 1;
4326                                 goto strres_nochunk;
4327                         }
4328                         /* no more */
4329                         break;
4330                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4331                         struct sctp_stream_reset_response *resp;
4332                         uint32_t result;
4333
4334                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4335                                 break;
4336                         }
4337                         resp = (struct sctp_stream_reset_response *)ph;
4338                         seq = ntohl(resp->response_seq);
4339                         result = ntohl(resp->result);
4340                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4341                                 ret_code = 1;
4342                                 goto strres_nochunk;
4343                         }
4344                 } else {
4345                         break;
4346                 }
4347                 offset += SCTP_SIZE32(param_len);
4348                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4349                         remaining_length -= SCTP_SIZE32(param_len);
4350                 } else {
4351                         remaining_length = 0;
4352                 }
4353         }
4354         if (num_req == 0) {
4355                 /* we have no response free the stuff */
4356                 goto strres_nochunk;
4357         }
4358         /* ok we have a chunk to link in */
4359         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4360             chk,
4361             sctp_next);
4362         stcb->asoc.ctrl_queue_cnt++;
4363         return (ret_code);
4364 }
4365
4366 /*
4367  * Handle a router or endpoints report of a packet loss, there are two ways
4368  * to handle this, either we get the whole packet and must disect it
4369  * ourselves (possibly with truncation and or corruption) or it is a summary
4370  * from a middle box that did the disectting for us.
4371  */
4372 static void
4373 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4374     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4375 {
4376         uint32_t bottle_bw, on_queue;
4377         uint16_t trunc_len;
4378         unsigned int chlen;
4379         unsigned int at;
4380         struct sctp_chunk_desc desc;
4381         struct sctp_chunkhdr *ch;
4382
4383         chlen = ntohs(cp->ch.chunk_length);
4384         chlen -= sizeof(struct sctp_pktdrop_chunk);
4385         /* XXX possible chlen underflow */
4386         if (chlen == 0) {
4387                 ch = NULL;
4388                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4389                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4390         } else {
4391                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4392                 chlen -= sizeof(struct sctphdr);
4393                 /* XXX possible chlen underflow */
4394                 memset(&desc, 0, sizeof(desc));
4395         }
4396         trunc_len = (uint16_t)ntohs(cp->trunc_len);
4397         if (trunc_len > limit) {
4398                 trunc_len = limit;
4399         }
4400
4401         /* now the chunks themselves */
4402         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4403                 desc.chunk_type = ch->chunk_type;
4404                 /* get amount we need to move */
4405                 at = ntohs(ch->chunk_length);
4406                 if (at < sizeof(struct sctp_chunkhdr)) {
4407                         /* corrupt chunk, maybe at the end? */
4408                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4409                         break;
4410                 }
4411                 if (trunc_len == 0) {
4412                         /* we are supposed to have all of it */
4413                         if (at > chlen) {
4414                                 /* corrupt skip it */
4415                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4416                                 break;
4417                         }
4418                 } else {
4419                         /* is there enough of it left ? */
4420                         if (desc.chunk_type == SCTP_DATA) {
4421                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4422                                     sizeof(desc.data_bytes))) {
4423                                         break;
4424                                 }
4425                         } else {
4426                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4427                                         break;
4428                                 }
4429                         }
4430                 }
4431                 if (desc.chunk_type == SCTP_DATA) {
4432                         /* can we get out the tsn? */
4433                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4434                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4435
4436                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4437                                 /* yep */
4438                                 struct sctp_data_chunk *dcp;
4439                                 uint8_t *ddp;
4440                                 unsigned int iii;
4441
4442                                 dcp = (struct sctp_data_chunk *)ch;
4443                                 ddp = (uint8_t *)(dcp + 1);
4444                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4445                                         desc.data_bytes[iii] = ddp[iii];
4446                                 }
4447                                 desc.tsn_ifany = dcp->dp.tsn;
4448                         } else {
4449                                 /* nope we are done. */
4450                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4451                                 break;
4452                         }
4453                 } else {
4454                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4455                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4456                 }
4457
4458                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4459                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4460                         break;
4461                 }
4462                 if (SCTP_SIZE32(at) > chlen) {
4463                         break;
4464                 }
4465                 chlen -= SCTP_SIZE32(at);
4466                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4467                         /* done, none left */
4468                         break;
4469                 }
4470                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4471         }
4472         /* Now update any rwnd --- possibly */
4473         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4474                 /* From a peer, we get a rwnd report */
4475                 uint32_t a_rwnd;
4476
4477                 SCTP_STAT_INCR(sctps_pdrpfehos);
4478
4479                 bottle_bw = ntohl(cp->bottle_bw);
4480                 on_queue = ntohl(cp->current_onq);
4481                 if (bottle_bw && on_queue) {
4482                         /* a rwnd report is in here */
4483                         if (bottle_bw > on_queue)
4484                                 a_rwnd = bottle_bw - on_queue;
4485                         else
4486                                 a_rwnd = 0;
4487
4488                         if (a_rwnd == 0)
4489                                 stcb->asoc.peers_rwnd = 0;
4490                         else {
4491                                 if (a_rwnd > stcb->asoc.total_flight) {
4492                                         stcb->asoc.peers_rwnd =
4493                                             a_rwnd - stcb->asoc.total_flight;
4494                                 } else {
4495                                         stcb->asoc.peers_rwnd = 0;
4496                                 }
4497                                 if (stcb->asoc.peers_rwnd <
4498                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4499                                         /* SWS sender side engages */
4500                                         stcb->asoc.peers_rwnd = 0;
4501                                 }
4502                         }
4503                 }
4504         } else {
4505                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4506         }
4507
4508         /* now middle boxes in sat networks get a cwnd bump */
4509         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4510             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4511             (stcb->asoc.sat_network)) {
4512                 /*
4513                  * This is debatable but for sat networks it makes sense
4514                  * Note if a T3 timer has went off, we will prohibit any
4515                  * changes to cwnd until we exit the t3 loss recovery.
4516                  */
4517                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4518                     net, cp, &bottle_bw, &on_queue);
4519         }
4520 }
4521
4522 /*
4523  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4524  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4525  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4526  * length of the complete packet outputs: - length: modified to remaining
4527  * length after control processing - netp: modified to new sctp_nets after
4528  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4529  * bad packet,...) otherwise return the tcb for this packet
4530  */
4531 #ifdef __GNUC__
4532 __attribute__((noinline))
4533 #endif
4534 static struct sctp_tcb *
4535 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4536     struct sockaddr *src, struct sockaddr *dst,
4537     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4538     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4539     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4540     uint32_t vrf_id, uint16_t port)
4541 {
4542         struct sctp_association *asoc;
4543         struct mbuf *op_err;
4544         char msg[SCTP_DIAG_INFO_LEN];
4545         uint32_t vtag_in;
4546         int num_chunks = 0;     /* number of control chunks processed */
4547         uint32_t chk_length, contiguous;
4548         int ret;
4549         int abort_no_unlock = 0;
4550         int ecne_seen = 0;
4551
4552         /*
4553          * How big should this be, and should it be alloc'd? Lets try the
4554          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4555          * until we get into jumbo grams and such..
4556          */
4557         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4558         int got_auth = 0;
4559         uint32_t auth_offset = 0, auth_len = 0;
4560         int auth_skipped = 0;
4561         int asconf_cnt = 0;
4562 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4563         struct socket *so;
4564 #endif
4565
4566         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4567             iphlen, *offset, length, (void *)stcb);
4568
4569         if (stcb) {
4570                 SCTP_TCB_LOCK_ASSERT(stcb);
4571         }
4572         /* validate chunk header length... */
4573         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4574                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4575                     ntohs(ch->chunk_length));
4576                 *offset = length;
4577                 return (stcb);
4578         }
4579         /*
4580          * validate the verification tag
4581          */
4582         vtag_in = ntohl(sh->v_tag);
4583
4584         if (ch->chunk_type == SCTP_INITIATION) {
4585                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4586                     ntohs(ch->chunk_length), vtag_in);
4587                 if (vtag_in != 0) {
4588                         /* protocol error- silently discard... */
4589                         SCTP_STAT_INCR(sctps_badvtag);
4590                         if (stcb != NULL) {
4591                                 SCTP_TCB_UNLOCK(stcb);
4592                         }
4593                         return (NULL);
4594                 }
4595         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4596                 /*
4597                  * If there is no stcb, skip the AUTH chunk and process
4598                  * later after a stcb is found (to validate the lookup was
4599                  * valid.
4600                  */
4601                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4602                     (stcb == NULL) &&
4603                     (inp->auth_supported == 1)) {
4604                         /* save this chunk for later processing */
4605                         auth_skipped = 1;
4606                         auth_offset = *offset;
4607                         auth_len = ntohs(ch->chunk_length);
4608
4609                         /* (temporarily) move past this chunk */
4610                         *offset += SCTP_SIZE32(auth_len);
4611                         if (*offset >= length) {
4612                                 /* no more data left in the mbuf chain */
4613                                 *offset = length;
4614                                 return (NULL);
4615                         }
4616                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4617                             sizeof(struct sctp_chunkhdr), chunk_buf);
4618                 }
4619                 if (ch == NULL) {
4620                         /* Help */
4621                         *offset = length;
4622                         return (stcb);
4623                 }
4624                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4625                         goto process_control_chunks;
4626                 }
4627                 /*
4628                  * first check if it's an ASCONF with an unknown src addr we
4629                  * need to look inside to find the association
4630                  */
4631                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4632                         struct sctp_chunkhdr *asconf_ch = ch;
4633                         uint32_t asconf_offset = 0, asconf_len = 0;
4634
4635                         /* inp's refcount may be reduced */
4636                         SCTP_INP_INCR_REF(inp);
4637
4638                         asconf_offset = *offset;
4639                         do {
4640                                 asconf_len = ntohs(asconf_ch->chunk_length);
4641                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4642                                         break;
4643                                 stcb = sctp_findassociation_ep_asconf(m,
4644                                     *offset,
4645                                     dst,
4646                                     sh, &inp, netp, vrf_id);
4647                                 if (stcb != NULL)
4648                                         break;
4649                                 asconf_offset += SCTP_SIZE32(asconf_len);
4650                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4651                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4652                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4653                         if (stcb == NULL) {
4654                                 /*
4655                                  * reduce inp's refcount if not reduced in
4656                                  * sctp_findassociation_ep_asconf().
4657                                  */
4658                                 SCTP_INP_DECR_REF(inp);
4659                         }
4660
4661                         /* now go back and verify any auth chunk to be sure */
4662                         if (auth_skipped && (stcb != NULL)) {
4663                                 struct sctp_auth_chunk *auth;
4664
4665                                 auth = (struct sctp_auth_chunk *)
4666                                     sctp_m_getptr(m, auth_offset,
4667                                     auth_len, chunk_buf);
4668                                 got_auth = 1;
4669                                 auth_skipped = 0;
4670                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4671                                     auth_offset)) {
4672                                         /* auth HMAC failed so dump it */
4673                                         *offset = length;
4674                                         return (stcb);
4675                                 } else {
4676                                         /* remaining chunks are HMAC checked */
4677                                         stcb->asoc.authenticated = 1;
4678                                 }
4679                         }
4680                 }
4681                 if (stcb == NULL) {
4682                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4683                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4684                             msg);
4685                         /* no association, so it's out of the blue... */
4686                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4687                             mflowtype, mflowid, inp->fibnum,
4688                             vrf_id, port);
4689                         *offset = length;
4690                         return (NULL);
4691                 }
4692                 asoc = &stcb->asoc;
4693                 /* ABORT and SHUTDOWN can use either v_tag... */
4694                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4695                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4696                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4697                         /* Take the T-bit always into account. */
4698                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4699                             (vtag_in == asoc->my_vtag)) ||
4700                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4701                             (asoc->peer_vtag != htonl(0)) &&
4702                             (vtag_in == asoc->peer_vtag))) {
4703                                 /* this is valid */
4704                         } else {
4705                                 /* drop this packet... */
4706                                 SCTP_STAT_INCR(sctps_badvtag);
4707                                 if (stcb != NULL) {
4708                                         SCTP_TCB_UNLOCK(stcb);
4709                                 }
4710                                 return (NULL);
4711                         }
4712                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4713                         if (vtag_in != asoc->my_vtag) {
4714                                 /*
4715                                  * this could be a stale SHUTDOWN-ACK or the
4716                                  * peer never got the SHUTDOWN-COMPLETE and
4717                                  * is still hung; we have started a new asoc
4718                                  * but it won't complete until the shutdown
4719                                  * is completed
4720                                  */
4721                                 if (stcb != NULL) {
4722                                         SCTP_TCB_UNLOCK(stcb);
4723                                 }
4724                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4725                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4726                                     msg);
4727                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4728                                     sh, inp, op_err,
4729                                     mflowtype, mflowid, fibnum,
4730                                     vrf_id, port);
4731                                 return (NULL);
4732                         }
4733                 } else {
4734                         /* for all other chunks, vtag must match */
4735                         if (vtag_in != asoc->my_vtag) {
4736                                 /* invalid vtag... */
4737                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4738                                     "invalid vtag: %xh, expect %xh\n",
4739                                     vtag_in, asoc->my_vtag);
4740                                 SCTP_STAT_INCR(sctps_badvtag);
4741                                 if (stcb != NULL) {
4742                                         SCTP_TCB_UNLOCK(stcb);
4743                                 }
4744                                 *offset = length;
4745                                 return (NULL);
4746                         }
4747                 }
4748         }                       /* end if !SCTP_COOKIE_ECHO */
4749         /*
4750          * process all control chunks...
4751          */
4752         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4753             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4754             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4755             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
4756                 /* implied cookie-ack.. we must have lost the ack */
4757                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4758                     *netp);
4759         }
4760
4761 process_control_chunks:
4762         while (IS_SCTP_CONTROL(ch)) {
4763                 /* validate chunk length */
4764                 chk_length = ntohs(ch->chunk_length);
4765                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4766                     ch->chunk_type, chk_length);
4767                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4768                 if (chk_length < sizeof(*ch) ||
4769                     (*offset + (int)chk_length) > length) {
4770                         *offset = length;
4771                         return (stcb);
4772                 }
4773                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4774                 /*
4775                  * INIT and INIT-ACK only gets the init ack "header" portion
4776                  * only because we don't have to process the peer's COOKIE.
4777                  * All others get a complete chunk.
4778                  */
4779                 switch (ch->chunk_type) {
4780                 case SCTP_INITIATION:
4781                         contiguous = sizeof(struct sctp_init_chunk);
4782                         break;
4783                 case SCTP_INITIATION_ACK:
4784                         contiguous = sizeof(struct sctp_init_ack_chunk);
4785                         break;
4786                 default:
4787                         contiguous = min(chk_length, sizeof(chunk_buf));
4788                         break;
4789                 }
4790                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4791                     contiguous,
4792                     chunk_buf);
4793                 if (ch == NULL) {
4794                         *offset = length;
4795                         if (stcb != NULL) {
4796                                 SCTP_TCB_UNLOCK(stcb);
4797                         }
4798                         return (NULL);
4799                 }
4800
4801                 num_chunks++;
4802                 /* Save off the last place we got a control from */
4803                 if (stcb != NULL) {
4804                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4805                                 /*
4806                                  * allow last_control to be NULL if
4807                                  * ASCONF... ASCONF processing will find the
4808                                  * right net later
4809                                  */
4810                                 if ((netp != NULL) && (*netp != NULL))
4811                                         stcb->asoc.last_control_chunk_from = *netp;
4812                         }
4813                 }
4814 #ifdef SCTP_AUDITING_ENABLED
4815                 sctp_audit_log(0xB0, ch->chunk_type);
4816 #endif
4817
4818                 /* check to see if this chunk required auth, but isn't */
4819                 if ((stcb != NULL) &&
4820                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4821                     !stcb->asoc.authenticated) {
4822                         /* "silently" ignore */
4823                         SCTP_STAT_INCR(sctps_recvauthmissing);
4824                         goto next_chunk;
4825                 }
4826                 switch (ch->chunk_type) {
4827                 case SCTP_INITIATION:
4828                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4829                         /* The INIT chunk must be the only chunk. */
4830                         if ((num_chunks > 1) ||
4831                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4832                                 /* RFC 4960 requires that no ABORT is sent */
4833                                 *offset = length;
4834                                 if (stcb != NULL) {
4835                                         SCTP_TCB_UNLOCK(stcb);
4836                                 }
4837                                 return (NULL);
4838                         }
4839                         /* Honor our resource limit. */
4840                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4841                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4842                                 sctp_abort_association(inp, stcb, m, iphlen,
4843                                     src, dst, sh, op_err,
4844                                     mflowtype, mflowid,
4845                                     vrf_id, port);
4846                                 *offset = length;
4847                                 return (NULL);
4848                         }
4849                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4850                             (struct sctp_init_chunk *)ch, inp,
4851                             stcb, *netp, &abort_no_unlock,
4852                             mflowtype, mflowid,
4853                             vrf_id, port);
4854                         *offset = length;
4855                         if ((!abort_no_unlock) && (stcb != NULL)) {
4856                                 SCTP_TCB_UNLOCK(stcb);
4857                         }
4858                         return (NULL);
4859                         break;
4860                 case SCTP_PAD_CHUNK:
4861                         break;
4862                 case SCTP_INITIATION_ACK:
4863                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
4864                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4865                                 /* We are not interested anymore */
4866                                 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
4867                                         ;
4868                                 } else {
4869                                         *offset = length;
4870                                         if (stcb != NULL) {
4871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4872                                                 so = SCTP_INP_SO(inp);
4873                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4874                                                 SCTP_TCB_UNLOCK(stcb);
4875                                                 SCTP_SOCKET_LOCK(so, 1);
4876                                                 SCTP_TCB_LOCK(stcb);
4877                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4878 #endif
4879                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4880                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4881 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4882                                                 SCTP_SOCKET_UNLOCK(so, 1);
4883 #endif
4884                                         }
4885                                         return (NULL);
4886                                 }
4887                         }
4888                         /* The INIT-ACK chunk must be the only chunk. */
4889                         if ((num_chunks > 1) ||
4890                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4891                                 *offset = length;
4892                                 return (stcb);
4893                         }
4894                         if ((netp != NULL) && (*netp != NULL)) {
4895                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4896                                     src, dst, sh,
4897                                     (struct sctp_init_ack_chunk *)ch,
4898                                     stcb, *netp,
4899                                     &abort_no_unlock,
4900                                     mflowtype, mflowid,
4901                                     vrf_id);
4902                         } else {
4903                                 ret = -1;
4904                         }
4905                         *offset = length;
4906                         if (abort_no_unlock) {
4907                                 return (NULL);
4908                         }
4909                         /*
4910                          * Special case, I must call the output routine to
4911                          * get the cookie echoed
4912                          */
4913                         if ((stcb != NULL) && (ret == 0)) {
4914                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4915                         }
4916                         return (stcb);
4917                         break;
4918                 case SCTP_SELECTIVE_ACK:
4919                 case SCTP_NR_SELECTIVE_ACK:
4920                         {
4921                                 int abort_now = 0;
4922                                 uint32_t a_rwnd, cum_ack;
4923                                 uint16_t num_seg, num_nr_seg, num_dup;
4924                                 uint8_t flags;
4925                                 int offset_seg, offset_dup;
4926
4927                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
4928                                     ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
4929                                 SCTP_STAT_INCR(sctps_recvsacks);
4930                                 if (stcb == NULL) {
4931                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
4932                                             (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
4933                                         break;
4934                                 }
4935                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4936                                         if (chk_length < sizeof(struct sctp_sack_chunk)) {
4937                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4938                                                 break;
4939                                         }
4940                                 } else {
4941                                         if (stcb->asoc.nrsack_supported == 0) {
4942                                                 goto unknown_chunk;
4943                                         }
4944                                         if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
4945                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
4946                                                 break;
4947                                         }
4948                                 }
4949                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4950                                         /*-
4951                                          * If we have sent a shutdown-ack, we will pay no
4952                                          * attention to a sack sent in to us since
4953                                          * we don't care anymore.
4954                                          */
4955                                         break;
4956                                 }
4957                                 flags = ch->chunk_flags;
4958                                 if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
4959                                         struct sctp_sack_chunk *sack;
4960
4961                                         sack = (struct sctp_sack_chunk *)ch;
4962                                         cum_ack = ntohl(sack->sack.cum_tsn_ack);
4963                                         num_seg = ntohs(sack->sack.num_gap_ack_blks);
4964                                         num_nr_seg = 0;
4965                                         num_dup = ntohs(sack->sack.num_dup_tsns);
4966                                         a_rwnd = ntohl(sack->sack.a_rwnd);
4967                                         if (sizeof(struct sctp_sack_chunk) +
4968                                             num_seg * sizeof(struct sctp_gap_ack_block) +
4969                                             num_dup * sizeof(uint32_t) != chk_length) {
4970                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4971                                                 break;
4972                                         }
4973                                         offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4974                                         offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4975                                 } else {
4976                                         struct sctp_nr_sack_chunk *nr_sack;
4977
4978                                         nr_sack = (struct sctp_nr_sack_chunk *)ch;
4979                                         cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
4980                                         num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
4981                                         num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
4982                                         num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
4983                                         a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
4984                                         if (sizeof(struct sctp_nr_sack_chunk) +
4985                                             (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
4986                                             num_dup * sizeof(uint32_t) != chk_length) {
4987                                                 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
4988                                                 break;
4989                                         }
4990                                         offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
4991                                         offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
4992                                 }
4993                                 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4994                                     (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
4995                                     cum_ack, num_seg, a_rwnd);
4996                                 stcb->asoc.seen_a_sack_this_pkt = 1;
4997                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
4998                                     (num_seg == 0) && (num_nr_seg == 0) &&
4999                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5000                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5001                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5002                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5003                                         /*
5004                                          * We have a SIMPLE sack having no
5005                                          * prior segments and data on sent
5006                                          * queue to be acked. Use the faster
5007                                          * path sack processing. We also
5008                                          * allow window update sacks with no
5009                                          * missing segments to go this way
5010                                          * too.
5011                                          */
5012                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5013                                             &abort_now, ecne_seen);
5014                                 } else {
5015                                         if ((netp != NULL) && (*netp != NULL)) {
5016                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5017                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5018                                                     cum_ack, a_rwnd, ecne_seen);
5019                                         }
5020                                 }
5021                                 if (abort_now) {
5022                                         /* ABORT signal from sack processing */
5023                                         *offset = length;
5024                                         return (NULL);
5025                                 }
5026                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5027                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5028                                     (stcb->asoc.stream_queue_cnt == 0)) {
5029                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5030                                 }
5031                                 break;
5032                         }
5033                 case SCTP_HEARTBEAT_REQUEST:
5034                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5035                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5036                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5037                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5038                                     chk_length, *netp);
5039                         }
5040                         break;
5041                 case SCTP_HEARTBEAT_ACK:
5042                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
5043                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5044                                 /* Its not ours */
5045                                 *offset = length;
5046                                 return (stcb);
5047                         }
5048                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5049                         if ((netp != NULL) && (*netp != NULL)) {
5050                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5051                                     stcb, *netp);
5052                         }
5053                         break;
5054                 case SCTP_ABORT_ASSOCIATION:
5055                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5056                             (void *)stcb);
5057                         *offset = length;
5058                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5059                                 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
5060                                         return (NULL);
5061                                 } else {
5062                                         return (stcb);
5063                                 }
5064                         } else {
5065                                 return (NULL);
5066                         }
5067                         break;
5068                 case SCTP_SHUTDOWN:
5069                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5070                             (void *)stcb);
5071                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5072                                 *offset = length;
5073                                 return (stcb);
5074                         }
5075                         if ((netp != NULL) && (*netp != NULL)) {
5076                                 int abort_flag = 0;
5077
5078                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5079                                     stcb, *netp, &abort_flag);
5080                                 if (abort_flag) {
5081                                         *offset = length;
5082                                         return (NULL);
5083                                 }
5084                         }
5085                         break;
5086                 case SCTP_SHUTDOWN_ACK:
5087                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
5088                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5089                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5090                         }
5091                         *offset = length;
5092                         return (NULL);
5093                         break;
5094                 case SCTP_OPERATION_ERROR:
5095                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
5096                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
5097                             sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
5098                                 *offset = length;
5099                                 return (NULL);
5100                         }
5101                         break;
5102                 case SCTP_COOKIE_ECHO:
5103                         SCTPDBG(SCTP_DEBUG_INPUT3,
5104                             "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
5105                         if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
5106                                 ;
5107                         } else {
5108                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5109                                         /* We are not interested anymore */
5110                         abend:
5111                                         if (stcb != NULL) {
5112                                                 SCTP_TCB_UNLOCK(stcb);
5113                                         }
5114                                         *offset = length;
5115                                         return (NULL);
5116                                 }
5117                         }
5118                         /*-
5119                          * First are we accepting? We do this again here
5120                          * since it is possible that a previous endpoint WAS
5121                          * listening responded to a INIT-ACK and then
5122                          * closed. We opened and bound.. and are now no
5123                          * longer listening.
5124                          *
5125                          * XXXGL: notes on checking listen queue length.
5126                          * 1) SCTP_IS_LISTENING() doesn't necessarily mean
5127                          *    SOLISTENING(), because a listening "UDP type"
5128                          *    socket isn't listening in terms of the socket
5129                          *    layer.  It is a normal data flow socket, that
5130                          *    can fork off new connections.  Thus, we should
5131                          *    look into sol_qlen only in case we are !UDP.
5132                          * 2) Checking sol_qlen in general requires locking
5133                          *    the socket, and this code lacks that.
5134                          */
5135                         if ((stcb == NULL) &&
5136                             (!SCTP_IS_LISTENING(inp) ||
5137                             (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) &&
5138                             inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
5139                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5140                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5141                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5142                                         sctp_abort_association(inp, stcb, m, iphlen,
5143                                             src, dst, sh, op_err,
5144                                             mflowtype, mflowid,
5145                                             vrf_id, port);
5146                                 }
5147                                 *offset = length;
5148                                 return (NULL);
5149                         } else {
5150                                 struct mbuf *ret_buf;
5151                                 struct sctp_inpcb *linp;
5152
5153                                 if (stcb) {
5154                                         linp = NULL;
5155                                 } else {
5156                                         linp = inp;
5157                                 }
5158
5159                                 if (linp != NULL) {
5160                                         SCTP_ASOC_CREATE_LOCK(linp);
5161                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5162                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5163                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5164                                                 goto abend;
5165                                         }
5166                                 }
5167
5168                                 if (netp != NULL) {
5169                                         struct sctp_tcb *locked_stcb;
5170
5171                                         locked_stcb = stcb;
5172                                         ret_buf =
5173                                             sctp_handle_cookie_echo(m, iphlen,
5174                                             *offset,
5175                                             src, dst,
5176                                             sh,
5177                                             (struct sctp_cookie_echo_chunk *)ch,
5178                                             &inp, &stcb, netp,
5179                                             auth_skipped,
5180                                             auth_offset,
5181                                             auth_len,
5182                                             &locked_stcb,
5183                                             mflowtype,
5184                                             mflowid,
5185                                             vrf_id,
5186                                             port);
5187                                         if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
5188                                                 SCTP_TCB_UNLOCK(locked_stcb);
5189                                         }
5190                                         if (stcb != NULL) {
5191                                                 SCTP_TCB_LOCK_ASSERT(stcb);
5192                                         }
5193                                 } else {
5194                                         ret_buf = NULL;
5195                                 }
5196                                 if (linp != NULL) {
5197                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5198                                 }
5199                                 if (ret_buf == NULL) {
5200                                         if (stcb != NULL) {
5201                                                 SCTP_TCB_UNLOCK(stcb);
5202                                         }
5203                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5204                                             "GAK, null buffer\n");
5205                                         *offset = length;
5206                                         return (NULL);
5207                                 }
5208                                 /* if AUTH skipped, see if it verified... */
5209                                 if (auth_skipped) {
5210                                         got_auth = 1;
5211                                         auth_skipped = 0;
5212                                 }
5213                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5214                                         /*
5215                                          * Restart the timer if we have
5216                                          * pending data
5217                                          */
5218                                         struct sctp_tmit_chunk *chk;
5219
5220                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5221                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5222                                 }
5223                         }
5224                         break;
5225                 case SCTP_COOKIE_ACK:
5226                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
5227                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5228                                 return (stcb);
5229                         }
5230                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5231                                 /* We are not interested anymore */
5232                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5233                                         ;
5234                                 } else if (stcb) {
5235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5236                                         so = SCTP_INP_SO(inp);
5237                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5238                                         SCTP_TCB_UNLOCK(stcb);
5239                                         SCTP_SOCKET_LOCK(so, 1);
5240                                         SCTP_TCB_LOCK(stcb);
5241                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5242 #endif
5243                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5244                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5246                                         SCTP_SOCKET_UNLOCK(so, 1);
5247 #endif
5248                                         *offset = length;
5249                                         return (NULL);
5250                                 }
5251                         }
5252                         if ((netp != NULL) && (*netp != NULL)) {
5253                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5254                         }
5255                         break;
5256                 case SCTP_ECN_ECHO:
5257                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
5258                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5259                                 /* Its not ours */
5260                                 *offset = length;
5261                                 return (stcb);
5262                         }
5263                         if (stcb->asoc.ecn_supported == 0) {
5264                                 goto unknown_chunk;
5265                         }
5266                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
5267                         ecne_seen = 1;
5268                         break;
5269                 case SCTP_ECN_CWR:
5270                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
5271                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5272                                 *offset = length;
5273                                 return (stcb);
5274                         }
5275                         if (stcb->asoc.ecn_supported == 0) {
5276                                 goto unknown_chunk;
5277                         }
5278                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5279                         break;
5280                 case SCTP_SHUTDOWN_COMPLETE:
5281                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
5282                         /* must be first and only chunk */
5283                         if ((num_chunks > 1) ||
5284                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5285                                 *offset = length;
5286                                 return (stcb);
5287                         }
5288                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5289                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5290                                     stcb, *netp);
5291                         }
5292                         *offset = length;
5293                         return (NULL);
5294                         break;
5295                 case SCTP_ASCONF:
5296                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5297                         if (stcb != NULL) {
5298                                 if (stcb->asoc.asconf_supported == 0) {
5299                                         goto unknown_chunk;
5300                                 }
5301                                 sctp_handle_asconf(m, *offset, src,
5302                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5303                                 asconf_cnt++;
5304                         }
5305                         break;
5306                 case SCTP_ASCONF_ACK:
5307                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
5308                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5309                                 /* Its not ours */
5310                                 *offset = length;
5311                                 return (stcb);
5312                         }
5313                         if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5314                                 if (stcb->asoc.asconf_supported == 0) {
5315                                         goto unknown_chunk;
5316                                 }
5317                                 /* He's alive so give him credit */
5318                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5319                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5320                                             stcb->asoc.overall_error_count,
5321                                             0,
5322                                             SCTP_FROM_SCTP_INPUT,
5323                                             __LINE__);
5324                                 }
5325                                 stcb->asoc.overall_error_count = 0;
5326                                 sctp_handle_asconf_ack(m, *offset,
5327                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5328                                 if (abort_no_unlock)
5329                                         return (NULL);
5330                         }
5331                         break;
5332                 case SCTP_FORWARD_CUM_TSN:
5333                 case SCTP_IFORWARD_CUM_TSN:
5334                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n");
5335                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5336                                 /* Its not ours */
5337                                 *offset = length;
5338                                 return (stcb);
5339                         }
5340
5341                         if (stcb != NULL) {
5342                                 int abort_flag = 0;
5343
5344                                 if (stcb->asoc.prsctp_supported == 0) {
5345                                         goto unknown_chunk;
5346                                 }
5347                                 *fwd_tsn_seen = 1;
5348                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5349                                         /* We are not interested anymore */
5350 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5351                                         so = SCTP_INP_SO(inp);
5352                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5353                                         SCTP_TCB_UNLOCK(stcb);
5354                                         SCTP_SOCKET_LOCK(so, 1);
5355                                         SCTP_TCB_LOCK(stcb);
5356                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5357 #endif
5358                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5359                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5360 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5361                                         SCTP_SOCKET_UNLOCK(so, 1);
5362 #endif
5363                                         *offset = length;
5364                                         return (NULL);
5365                                 }
5366                                 /*
5367                                  * For sending a SACK this looks like DATA
5368                                  * chunks.
5369                                  */
5370                                 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
5371                                 sctp_handle_forward_tsn(stcb,
5372                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5373                                 if (abort_flag) {
5374                                         *offset = length;
5375                                         return (NULL);
5376                                 }
5377                         }
5378                         break;
5379                 case SCTP_STREAM_RESET:
5380                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5381                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5382                                 /* Its not ours */
5383                                 *offset = length;
5384                                 return (stcb);
5385                         }
5386                         if (stcb->asoc.reconfig_supported == 0) {
5387                                 goto unknown_chunk;
5388                         }
5389                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5390                                 /* stop processing */
5391                                 *offset = length;
5392                                 return (NULL);
5393                         }
5394                         break;
5395                 case SCTP_PACKET_DROPPED:
5396                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5397                         /* re-get it all please */
5398                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5399                                 /* Its not ours */
5400                                 *offset = length;
5401                                 return (stcb);
5402                         }
5403
5404                         if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
5405                                 if (stcb->asoc.pktdrop_supported == 0) {
5406                                         goto unknown_chunk;
5407                                 }
5408                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5409                                     stcb, *netp,
5410                                     min(chk_length, contiguous));
5411                         }
5412                         break;
5413                 case SCTP_AUTHENTICATION:
5414                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5415                         if (stcb == NULL) {
5416                                 /* save the first AUTH for later processing */
5417                                 if (auth_skipped == 0) {
5418                                         auth_offset = *offset;
5419                                         auth_len = chk_length;
5420                                         auth_skipped = 1;
5421                                 }
5422                                 /* skip this chunk (temporarily) */
5423                                 goto next_chunk;
5424                         }
5425                         if (stcb->asoc.auth_supported == 0) {
5426                                 goto unknown_chunk;
5427                         }
5428                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5429                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5430                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5431                                 /* Its not ours */
5432                                 *offset = length;
5433                                 return (stcb);
5434                         }
5435                         if (got_auth == 1) {
5436                                 /* skip this chunk... it's already auth'd */
5437                                 goto next_chunk;
5438                         }
5439                         got_auth = 1;
5440                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5441                             m, *offset)) {
5442                                 /* auth HMAC failed so dump the packet */
5443                                 *offset = length;
5444                                 return (stcb);
5445                         } else {
5446                                 /* remaining chunks are HMAC checked */
5447                                 stcb->asoc.authenticated = 1;
5448                         }
5449                         break;
5450
5451                 default:
5452         unknown_chunk:
5453                         /* it's an unknown chunk! */
5454                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5455                                 struct sctp_gen_error_cause *cause;
5456                                 int len;
5457
5458                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5459                                     0, M_NOWAIT, 1, MT_DATA);
5460                                 if (op_err != NULL) {
5461                                         len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
5462                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5463                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5464                                         cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
5465                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5466                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5467                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5468 #ifdef SCTP_MBUF_LOGGING
5469                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5470                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5471                                                 }
5472 #endif
5473                                                 sctp_queue_op_err(stcb, op_err);
5474                                         } else {
5475                                                 sctp_m_freem(op_err);
5476                                         }
5477                                 }
5478                         }
5479                         if ((ch->chunk_type & 0x80) == 0) {
5480                                 /* discard this packet */
5481                                 *offset = length;
5482                                 return (stcb);
5483                         }       /* else skip this bad chunk and continue... */
5484                         break;
5485                 }               /* switch (ch->chunk_type) */
5486
5487
5488 next_chunk:
5489                 /* get the next chunk */
5490                 *offset += SCTP_SIZE32(chk_length);
5491                 if (*offset >= length) {
5492                         /* no more data left in the mbuf chain */
5493                         break;
5494                 }
5495                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5496                     sizeof(struct sctp_chunkhdr), chunk_buf);
5497                 if (ch == NULL) {
5498                         *offset = length;
5499                         return (stcb);
5500                 }
5501         }                       /* while */
5502
5503         if ((asconf_cnt > 0) && (stcb != NULL)) {
5504                 sctp_send_asconf_ack(stcb);
5505         }
5506         return (stcb);
5507 }
5508
5509
5510 /*
5511  * common input chunk processing (v4 and v6)
5512  */
5513 void
5514 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5515     struct sockaddr *src, struct sockaddr *dst,
5516     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5517     uint8_t compute_crc,
5518     uint8_t ecn_bits,
5519     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5520     uint32_t vrf_id, uint16_t port)
5521 {
5522         uint32_t high_tsn;
5523         int fwd_tsn_seen = 0, data_processed = 0;
5524         struct mbuf *m = *mm, *op_err;
5525         char msg[SCTP_DIAG_INFO_LEN];
5526         int un_sent;
5527         int cnt_ctrl_ready = 0;
5528         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5529         struct sctp_tcb *stcb = NULL;
5530         struct sctp_nets *net = NULL;
5531
5532         SCTP_STAT_INCR(sctps_recvdatagrams);
5533 #ifdef SCTP_AUDITING_ENABLED
5534         sctp_audit_log(0xE0, 1);
5535         sctp_auditing(0, inp, stcb, net);
5536 #endif
5537         if (compute_crc != 0) {
5538                 uint32_t check, calc_check;
5539
5540                 check = sh->checksum;
5541                 sh->checksum = 0;
5542                 calc_check = sctp_calculate_cksum(m, iphlen);
5543                 sh->checksum = check;
5544                 if (calc_check != check) {
5545                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5546                             calc_check, check, (void *)m, length, iphlen);
5547                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5548                             sh, ch, &inp, &net, vrf_id);
5549 #if defined(INET) || defined(INET6)
5550                         if ((ch->chunk_type != SCTP_INITIATION) &&
5551                             (net != NULL) && (net->port != port)) {
5552                                 if (net->port == 0) {
5553                                         /* UDP encapsulation turned on. */
5554                                         net->mtu -= sizeof(struct udphdr);
5555                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5556                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5557                                         }
5558                                 } else if (port == 0) {
5559                                         /* UDP encapsulation turned off. */
5560                                         net->mtu += sizeof(struct udphdr);
5561                                         /* XXX Update smallest_mtu */
5562                                 }
5563                                 net->port = port;
5564                         }
5565 #endif
5566                         if (net != NULL) {
5567                                 net->flowtype = mflowtype;
5568                                 net->flowid = mflowid;
5569                         }
5570                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5571                         if ((inp != NULL) && (stcb != NULL)) {
5572                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5573                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5574                         } else if ((inp != NULL) && (stcb == NULL)) {
5575                                 inp_decr = inp;
5576                         }
5577                         SCTP_STAT_INCR(sctps_badsum);
5578                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5579                         goto out;
5580                 }
5581         }
5582         /* Destination port of 0 is illegal, based on RFC4960. */
5583         if (sh->dest_port == 0) {
5584                 SCTP_STAT_INCR(sctps_hdrops);
5585                 goto out;
5586         }
5587         stcb = sctp_findassociation_addr(m, offset, src, dst,
5588             sh, ch, &inp, &net, vrf_id);
5589 #if defined(INET) || defined(INET6)
5590         if ((ch->chunk_type != SCTP_INITIATION) &&
5591             (net != NULL) && (net->port != port)) {
5592                 if (net->port == 0) {
5593                         /* UDP encapsulation turned on. */
5594                         net->mtu -= sizeof(struct udphdr);
5595                         if (stcb->asoc.smallest_mtu > net->mtu) {
5596                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5597                         }
5598                 } else if (port == 0) {
5599                         /* UDP encapsulation turned off. */
5600                         net->mtu += sizeof(struct udphdr);
5601                         /* XXX Update smallest_mtu */
5602                 }
5603                 net->port = port;
5604         }
5605 #endif
5606         if (net != NULL) {
5607                 net->flowtype = mflowtype;
5608                 net->flowid = mflowid;
5609         }
5610         if (inp == NULL) {
5611                 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5612                 SCTP_STAT_INCR(sctps_noport);
5613                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5614                         goto out;
5615                 }
5616                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5617                         sctp_send_shutdown_complete2(src, dst, sh,
5618                             mflowtype, mflowid, fibnum,
5619                             vrf_id, port);
5620                         goto out;
5621                 }
5622                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5623                         goto out;
5624                 }
5625                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5626                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5627                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5628                             (ch->chunk_type != SCTP_INIT))) {
5629                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5630                                     "Out of the blue");
5631                                 sctp_send_abort(m, iphlen, src, dst,
5632                                     sh, 0, op_err,
5633                                     mflowtype, mflowid, fibnum,
5634                                     vrf_id, port);
5635                         }
5636                 }
5637                 goto out;
5638         } else if (stcb == NULL) {
5639                 inp_decr = inp;
5640         }
5641         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5642             (void *)m, iphlen, offset, length, (void *)stcb);
5643         if (stcb) {
5644                 /* always clear this before beginning a packet */
5645                 stcb->asoc.authenticated = 0;
5646                 stcb->asoc.seen_a_sack_this_pkt = 0;
5647                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5648                     (void *)stcb, stcb->asoc.state);
5649
5650                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5651                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5652                         /*-
5653                          * If we hit here, we had a ref count
5654                          * up when the assoc was aborted and the
5655                          * timer is clearing out the assoc, we should
5656                          * NOT respond to any packet.. its OOTB.
5657                          */
5658                         SCTP_TCB_UNLOCK(stcb);
5659                         stcb = NULL;
5660                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5661                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5662                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5663                             msg);
5664                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5665                             mflowtype, mflowid, inp->fibnum,
5666                             vrf_id, port);
5667                         goto out;
5668                 }
5669         }
5670         if (IS_SCTP_CONTROL(ch)) {
5671                 /* process the control portion of the SCTP packet */
5672                 /* sa_ignore NO_NULL_CHK */
5673                 stcb = sctp_process_control(m, iphlen, &offset, length,
5674                     src, dst, sh, ch,
5675                     inp, stcb, &net, &fwd_tsn_seen,
5676                     mflowtype, mflowid, fibnum,
5677                     vrf_id, port);
5678                 if (stcb) {
5679                         /*
5680                          * This covers us if the cookie-echo was there and
5681                          * it changes our INP.
5682                          */
5683                         inp = stcb->sctp_ep;
5684 #if defined(INET) || defined(INET6)
5685                         if ((ch->chunk_type != SCTP_INITIATION) &&
5686                             (net != NULL) && (net->port != port)) {
5687                                 if (net->port == 0) {
5688                                         /* UDP encapsulation turned on. */
5689                                         net->mtu -= sizeof(struct udphdr);
5690                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5691                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5692                                         }
5693                                 } else if (port == 0) {
5694                                         /* UDP encapsulation turned off. */
5695                                         net->mtu += sizeof(struct udphdr);
5696                                         /* XXX Update smallest_mtu */
5697                                 }
5698                                 net->port = port;
5699                         }
5700 #endif
5701                 }
5702         } else {
5703                 /*
5704                  * no control chunks, so pre-process DATA chunks (these
5705                  * checks are taken care of by control processing)
5706                  */
5707
5708                 /*
5709                  * if DATA only packet, and auth is required, then punt...
5710                  * can't have authenticated without any AUTH (control)
5711                  * chunks
5712                  */
5713                 if ((stcb != NULL) &&
5714                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5715                         /* "silently" ignore */
5716                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5717                         SCTP_STAT_INCR(sctps_recvauthmissing);
5718                         goto out;
5719                 }
5720                 if (stcb == NULL) {
5721                         /* out of the blue DATA chunk */
5722                         SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
5723                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5724                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5725                             msg);
5726                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5727                             mflowtype, mflowid, fibnum,
5728                             vrf_id, port);
5729                         goto out;
5730                 }
5731                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5732                         /* v_tag mismatch! */
5733                         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5734                         SCTP_STAT_INCR(sctps_badvtag);
5735                         goto out;
5736                 }
5737         }
5738
5739         SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
5740         if (stcb == NULL) {
5741                 /*
5742                  * no valid TCB for this packet, or we found it's a bad
5743                  * packet while processing control, or we're done with this
5744                  * packet (done or skip rest of data), so we drop it...
5745                  */
5746                 goto out;
5747         }
5748
5749         /*
5750          * DATA chunk processing
5751          */
5752         /* plow through the data chunks while length > offset */
5753
5754         /*
5755          * Rest should be DATA only.  Check authentication state if AUTH for
5756          * DATA is required.
5757          */
5758         if ((length > offset) &&
5759             (stcb != NULL) &&
5760             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5761             !stcb->asoc.authenticated) {
5762                 /* "silently" ignore */
5763                 SCTP_STAT_INCR(sctps_recvauthmissing);
5764                 SCTPDBG(SCTP_DEBUG_AUTH1,
5765                     "Data chunk requires AUTH, skipped\n");
5766                 goto trigger_send;
5767         }
5768         if (length > offset) {
5769                 int retval;
5770
5771                 /*
5772                  * First check to make sure our state is correct. We would
5773                  * not get here unless we really did have a tag, so we don't
5774                  * abort if this happens, just dump the chunk silently.
5775                  */
5776                 switch (SCTP_GET_STATE(stcb)) {
5777                 case SCTP_STATE_COOKIE_ECHOED:
5778                         /*
5779                          * we consider data with valid tags in this state
5780                          * shows us the cookie-ack was lost. Imply it was
5781                          * there.
5782                          */
5783                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5784                         break;
5785                 case SCTP_STATE_COOKIE_WAIT:
5786                         /*
5787                          * We consider OOTB any data sent during asoc setup.
5788                          */
5789                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5790                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5791                             msg);
5792                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5793                             mflowtype, mflowid, inp->fibnum,
5794                             vrf_id, port);
5795                         goto out;
5796                         /* sa_ignore NOTREACHED */
5797                         break;
5798                 case SCTP_STATE_EMPTY:  /* should not happen */
5799                 case SCTP_STATE_INUSE:  /* should not happen */
5800                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
5801                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
5802                 default:
5803                         goto out;
5804                         /* sa_ignore NOTREACHED */
5805                         break;
5806                 case SCTP_STATE_OPEN:
5807                 case SCTP_STATE_SHUTDOWN_SENT:
5808                         break;
5809                 }
5810                 /* plow through the data chunks while length > offset */
5811                 retval = sctp_process_data(mm, iphlen, &offset, length,
5812                     inp, stcb, net, &high_tsn);
5813                 if (retval == 2) {
5814                         /*
5815                          * The association aborted, NO UNLOCK needed since
5816                          * the association is destroyed.
5817                          */
5818                         stcb = NULL;
5819                         goto out;
5820                 }
5821                 data_processed = 1;
5822                 /*
5823                  * Anything important needs to have been m_copy'ed in
5824                  * process_data
5825                  */
5826         }
5827
5828         /* take care of ecn */
5829         if ((data_processed == 1) &&
5830             (stcb->asoc.ecn_supported == 1) &&
5831             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
5832                 /* Yep, we need to add a ECNE */
5833                 sctp_send_ecn_echo(stcb, net, high_tsn);
5834         }
5835
5836         if ((data_processed == 0) && (fwd_tsn_seen)) {
5837                 int was_a_gap;
5838                 uint32_t highest_tsn;
5839
5840                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
5841                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
5842                 } else {
5843                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
5844                 }
5845                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
5846                 stcb->asoc.send_sack = 1;
5847                 sctp_sack_check(stcb, was_a_gap);
5848         } else if (fwd_tsn_seen) {
5849                 stcb->asoc.send_sack = 1;
5850         }
5851         /* trigger send of any chunks in queue... */
5852 trigger_send:
5853 #ifdef SCTP_AUDITING_ENABLED
5854         sctp_audit_log(0xE0, 2);
5855         sctp_auditing(1, inp, stcb, net);
5856 #endif
5857         SCTPDBG(SCTP_DEBUG_INPUT1,
5858             "Check for chunk output prw:%d tqe:%d tf=%d\n",
5859             stcb->asoc.peers_rwnd,
5860             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
5861             stcb->asoc.total_flight);
5862         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
5863         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
5864                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
5865         }
5866         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
5867             cnt_ctrl_ready ||
5868             stcb->asoc.trigger_reset ||
5869             ((un_sent) &&
5870             (stcb->asoc.peers_rwnd > 0 ||
5871             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
5872                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
5873                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
5874                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
5875         }
5876 #ifdef SCTP_AUDITING_ENABLED
5877         sctp_audit_log(0xE0, 3);
5878         sctp_auditing(2, inp, stcb, net);
5879 #endif
5880 out:
5881         if (stcb != NULL) {
5882                 SCTP_TCB_UNLOCK(stcb);
5883         }
5884         if (inp_decr != NULL) {
5885                 /* reduce ref-count */
5886                 SCTP_INP_WLOCK(inp_decr);
5887                 SCTP_INP_DECR_REF(inp_decr);
5888                 SCTP_INP_WUNLOCK(inp_decr);
5889         }
5890         return;
5891 }
5892
5893 #ifdef INET
5894 void
5895 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
5896 {
5897         struct mbuf *m;
5898         int iphlen;
5899         uint32_t vrf_id = 0;
5900         uint8_t ecn_bits;
5901         struct sockaddr_in src, dst;
5902         struct ip *ip;
5903         struct sctphdr *sh;
5904         struct sctp_chunkhdr *ch;
5905         int length, offset;
5906         uint8_t compute_crc;
5907         uint32_t mflowid;
5908         uint8_t mflowtype;
5909         uint16_t fibnum;
5910
5911         iphlen = off;
5912         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
5913                 SCTP_RELEASE_PKT(i_pak);
5914                 return;
5915         }
5916         m = SCTP_HEADER_TO_CHAIN(i_pak);
5917 #ifdef SCTP_MBUF_LOGGING
5918         /* Log in any input mbufs */
5919         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5920                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
5921         }
5922 #endif
5923 #ifdef SCTP_PACKET_LOGGING
5924         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
5925                 sctp_packet_log(m);
5926         }
5927 #endif
5928         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
5929             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
5930             m->m_pkthdr.len,
5931             if_name(m->m_pkthdr.rcvif),
5932             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
5933         mflowid = m->m_pkthdr.flowid;
5934         mflowtype = M_HASHTYPE_GET(m);
5935         fibnum = M_GETFIB(m);
5936         SCTP_STAT_INCR(sctps_recvpackets);
5937         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
5938         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
5939         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
5940         if (SCTP_BUF_LEN(m) < offset) {
5941                 if ((m = m_pullup(m, offset)) == NULL) {
5942                         SCTP_STAT_INCR(sctps_hdrops);
5943                         return;
5944                 }
5945         }
5946         ip = mtod(m, struct ip *);
5947         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
5948         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
5949         offset -= sizeof(struct sctp_chunkhdr);
5950         memset(&src, 0, sizeof(struct sockaddr_in));
5951         src.sin_family = AF_INET;
5952         src.sin_len = sizeof(struct sockaddr_in);
5953         src.sin_port = sh->src_port;
5954         src.sin_addr = ip->ip_src;
5955         memset(&dst, 0, sizeof(struct sockaddr_in));
5956         dst.sin_family = AF_INET;
5957         dst.sin_len = sizeof(struct sockaddr_in);
5958         dst.sin_port = sh->dest_port;
5959         dst.sin_addr = ip->ip_dst;
5960         length = ntohs(ip->ip_len);
5961         /* Validate mbuf chain length with IP payload length. */
5962         if (SCTP_HEADER_LEN(m) != length) {
5963                 SCTPDBG(SCTP_DEBUG_INPUT1,
5964                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
5965                 SCTP_STAT_INCR(sctps_hdrops);
5966                 goto out;
5967         }
5968         /* SCTP does not allow broadcasts or multicasts */
5969         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
5970                 goto out;
5971         }
5972         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
5973                 goto out;
5974         }
5975         ecn_bits = ip->ip_tos;
5976         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
5977                 SCTP_STAT_INCR(sctps_recvhwcrc);
5978                 compute_crc = 0;
5979         } else {
5980                 SCTP_STAT_INCR(sctps_recvswcrc);
5981                 compute_crc = 1;
5982         }
5983         sctp_common_input_processing(&m, iphlen, offset, length,
5984             (struct sockaddr *)&src,
5985             (struct sockaddr *)&dst,
5986             sh, ch,
5987             compute_crc,
5988             ecn_bits,
5989             mflowtype, mflowid, fibnum,
5990             vrf_id, port);
5991 out:
5992         if (m) {
5993                 sctp_m_freem(m);
5994         }
5995         return;
5996 }
5997
5998 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
5999 extern int *sctp_cpuarry;
6000 #endif
6001
6002 int
6003 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6004 {
6005         struct mbuf *m;
6006         int off;
6007
6008         m = *mp;
6009         off = *offp;
6010 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6011         if (mp_ncpus > 1) {
6012                 struct ip *ip;
6013                 struct sctphdr *sh;
6014                 int offset;
6015                 int cpu_to_use;
6016                 uint32_t flowid, tag;
6017
6018                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6019                         flowid = m->m_pkthdr.flowid;
6020                 } else {
6021                         /*
6022                          * No flow id built by lower layers fix it so we
6023                          * create one.
6024                          */
6025                         offset = off + sizeof(struct sctphdr);
6026                         if (SCTP_BUF_LEN(m) < offset) {
6027                                 if ((m = m_pullup(m, offset)) == NULL) {
6028                                         SCTP_STAT_INCR(sctps_hdrops);
6029                                         return (IPPROTO_DONE);
6030                                 }
6031                         }
6032                         ip = mtod(m, struct ip *);
6033                         sh = (struct sctphdr *)((caddr_t)ip + off);
6034                         tag = htonl(sh->v_tag);
6035                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6036                         m->m_pkthdr.flowid = flowid;
6037                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
6038                 }
6039                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6040                 sctp_queue_to_mcore(m, off, cpu_to_use);
6041                 return (IPPROTO_DONE);
6042         }
6043 #endif
6044         sctp_input_with_port(m, off, 0);
6045         return (IPPROTO_DONE);
6046 }
6047 #endif