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