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