sys/netinet/sctp_input.c

   1 /*-
   2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #include <netinet/sctp_var.h>
  38 #include <netinet/sctp_sysctl.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctputil.h>
  42 #include <netinet/sctp_output.h>
  43 #include <netinet/sctp_input.h>
  44 #include <netinet/sctp_auth.h>
  45 #include <netinet/sctp_indata.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctp_bsd_addr.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_crc32.h>
  50 #if defined(INET) || defined(INET6)
  51 #include <netinet/udp.h>
  52 #endif
  53 #include <sys/smp.h>
  54
  55
  56
  57 static void
  58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
  59 {
  60         struct sctp_nets *net;
  61
  62         /*
  63          * This now not only stops all cookie timers it also stops any INIT
  64          * timers as well. This will make sure that the timers are stopped
  65          * in all collision cases.
  66          */
  67         SCTP_TCB_LOCK_ASSERT(stcb);
  68         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
  69                 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
  70                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
  71                             stcb->sctp_ep,
  72                             stcb,
  73                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
  74                 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
  75                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
  76                             stcb->sctp_ep,
  77                             stcb,
  78                             net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
  79                 }
  80         }
  81 }
  82
  83 /* INIT handler */
  84 static void
  85 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
  86     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
  87     struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
  88     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
  89     uint8_t mflowtype, uint32_t mflowid,
  90     uint32_t vrf_id, uint16_t port)
  91 {
  92         struct sctp_init *init;
  93         struct mbuf *op_err;
  94
  95         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
  96             (void *)stcb);
  97         if (stcb == NULL) {
  98                 SCTP_INP_RLOCK(inp);
  99         }
 100         /* validate length */
 101         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 102                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 103                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 104                     mflowtype, mflowid,
 105                     vrf_id, port);
 106                 if (stcb)
 107                         *abort_no_unlock = 1;
 108                 goto outnow;
 109         }
 110         /* validate parameters */
 111         init = &cp->init;
 112         if (init->initiate_tag == 0) {
 113                 /* protocol error... send abort */
 114                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 115                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 116                     mflowtype, mflowid,
 117                     vrf_id, port);
 118                 if (stcb)
 119                         *abort_no_unlock = 1;
 120                 goto outnow;
 121         }
 122         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 123                 /* invalid parameter... send abort */
 124                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 125                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 126                     mflowtype, mflowid,
 127                     vrf_id, port);
 128                 if (stcb)
 129                         *abort_no_unlock = 1;
 130                 goto outnow;
 131         }
 132         if (init->num_inbound_streams == 0) {
 133                 /* protocol error... send abort */
 134                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 135                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 136                     mflowtype, mflowid,
 137                     vrf_id, port);
 138                 if (stcb)
 139                         *abort_no_unlock = 1;
 140                 goto outnow;
 141         }
 142         if (init->num_outbound_streams == 0) {
 143                 /* protocol error... send abort */
 144                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
 145                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 146                     mflowtype, mflowid,
 147                     vrf_id, port);
 148                 if (stcb)
 149                         *abort_no_unlock = 1;
 150                 goto outnow;
 151         }
 152         if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
 153             offset + ntohs(cp->ch.chunk_length))) {
 154                 /* auth parameter(s) error... send abort */
 155                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 156                     "Problem with AUTH parameters");
 157                 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
 158                     mflowtype, mflowid,
 159                     vrf_id, port);
 160                 if (stcb)
 161                         *abort_no_unlock = 1;
 162                 goto outnow;
 163         }
 164         /*
 165          * We are only accepting if we have a socket with positive
 166          * so_qlimit.
 167          */
 168         if ((stcb == NULL) &&
 169             ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
 170             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
 171             (inp->sctp_socket == NULL) ||
 172             (inp->sctp_socket->so_qlimit == 0))) {
 173                 /*
 174                  * FIX ME ?? What about TCP model and we have a
 175                  * match/restart case? Actually no fix is needed. the lookup
 176                  * will always find the existing assoc so stcb would not be
 177                  * NULL. It may be questionable to do this since we COULD
 178                  * just send back the INIT-ACK and hope that the app did
 179                  * accept()'s by the time the COOKIE was sent. But there is
 180                  * a price to pay for COOKIE generation and I don't want to
 181                  * pay it on the chance that the app will actually do some
 182                  * accepts(). The App just looses and should NOT be in this
 183                  * state :-)
 184                  */
 185                 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
 186                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 187                             "No listener");
 188                         sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
 189                             mflowtype, mflowid, inp->fibnum,
 190                             vrf_id, port);
 191                 }
 192                 goto outnow;
 193         }
 194         if ((stcb != NULL) &&
 195             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 196                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
 197                 sctp_send_shutdown_ack(stcb, NULL);
 198                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
 199         } else {
 200                 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
 201                 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
 202                     src, dst, sh, cp,
 203                     mflowtype, mflowid,
 204                     vrf_id, port,
 205                     ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
 206         }
 207 outnow:
 208         if (stcb == NULL) {
 209                 SCTP_INP_RUNLOCK(inp);
 210         }
 211 }
 212
 213 /*
 214  * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
 215  */
 216
 217 int
 218 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
 219 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 220     SCTP_UNUSED
 221 #endif
 222 )
 223 {
 224         int unsent_data = 0;
 225         unsigned int i;
 226         struct sctp_stream_queue_pending *sp;
 227         struct sctp_association *asoc;
 228
 229         /*
 230          * This function returns the number of streams that have true unsent
 231          * data on them. Note that as it looks through it will clean up any
 232          * places that have old data that has been sent but left at top of
 233          * stream queue.
 234          */
 235         asoc = &stcb->asoc;
 236         SCTP_TCB_SEND_LOCK(stcb);
 237         if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 238                 /* Check to see if some data queued */
 239                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 240                         /* sa_ignore FREED_MEMORY */
 241                         sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
 242                         if (sp == NULL) {
 243                                 continue;
 244                         }
 245                         if ((sp->msg_is_complete) &&
 246                             (sp->length == 0) &&
 247                             (sp->sender_all_done)) {
 248                                 /*
 249                                  * We are doing differed cleanup. Last time
 250                                  * through when we took all the data the
 251                                  * sender_all_done was not set.
 252                                  */
 253                                 if (sp->put_last_out == 0) {
 254                                         SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 255                                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 256                                             sp->sender_all_done,
 257                                             sp->length,
 258                                             sp->msg_is_complete,
 259                                             sp->put_last_out);
 260                                 }
 261                                 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
 262                                 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
 263                                 if (sp->net) {
 264                                         sctp_free_remote_addr(sp->net);
 265                                         sp->net = NULL;
 266                                 }
 267                                 if (sp->data) {
 268                                         sctp_m_freem(sp->data);
 269                                         sp->data = NULL;
 270                                 }
 271                                 sctp_free_a_strmoq(stcb, sp, so_locked);
 272                         } else {
 273                                 unsent_data++;
 274                                 break;
 275                         }
 276                 }
 277         }
 278         SCTP_TCB_SEND_UNLOCK(stcb);
 279         return (unsent_data);
 280 }
 281
 282 static int
 283 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 284 {
 285         struct sctp_init *init;
 286         struct sctp_association *asoc;
 287         struct sctp_nets *lnet;
 288         unsigned int i;
 289
 290         init = &cp->init;
 291         asoc = &stcb->asoc;
 292         /* save off parameters */
 293         asoc->peer_vtag = ntohl(init->initiate_tag);
 294         asoc->peers_rwnd = ntohl(init->a_rwnd);
 295         /* init tsn's */
 296         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 297
 298         if (!TAILQ_EMPTY(&asoc->nets)) {
 299                 /* update any ssthresh's that may have a default */
 300                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 301                         lnet->ssthresh = asoc->peers_rwnd;
 302                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) {
 303                                 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
 304                         }
 305                 }
 306         }
 307         SCTP_TCB_SEND_LOCK(stcb);
 308         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 309                 unsigned int newcnt;
 310                 struct sctp_stream_out *outs;
 311                 struct sctp_stream_queue_pending *sp, *nsp;
 312                 struct sctp_tmit_chunk *chk, *nchk;
 313
 314                 /* abandon the upper streams */
 315                 newcnt = ntohs(init->num_inbound_streams);
 316                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 317                         if (chk->rec.data.stream_number >= newcnt) {
 318                                 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 319                                 asoc->send_queue_cnt--;
 320                                 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
 321                                         asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
 322 #ifdef INVARIANTS
 323                                 } else {
 324                                         panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
 325 #endif
 326                                 }
 327                                 if (chk->data != NULL) {
 328                                         sctp_free_bufspace(stcb, asoc, chk, 1);
 329                                         sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
 330                                             0, chk, SCTP_SO_NOT_LOCKED);
 331                                         if (chk->data) {
 332                                                 sctp_m_freem(chk->data);
 333                                                 chk->data = NULL;
 334                                         }
 335                                 }
 336                                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 337                                 /* sa_ignore FREED_MEMORY */
 338                         }
 339                 }
 340                 if (asoc->strmout) {
 341                         for (i = newcnt; i < asoc->pre_open_streams; i++) {
 342                                 outs = &asoc->strmout[i];
 343                                 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
 344                                         TAILQ_REMOVE(&outs->outqueue, sp, next);
 345                                         asoc->stream_queue_cnt--;
 346                                         sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
 347                                             stcb, 0, sp, SCTP_SO_NOT_LOCKED);
 348                                         if (sp->data) {
 349                                                 sctp_m_freem(sp->data);
 350                                                 sp->data = NULL;
 351                                         }
 352                                         if (sp->net) {
 353                                                 sctp_free_remote_addr(sp->net);
 354                                                 sp->net = NULL;
 355                                         }
 356                                         /* Free the chunk */
 357                                         sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
 358                                         /* sa_ignore FREED_MEMORY */
 359                                 }
 360                                 outs->state = SCTP_STREAM_CLOSED;
 361                         }
 362                 }
 363                 /* cut back the count */
 364                 asoc->pre_open_streams = newcnt;
 365         }
 366         SCTP_TCB_SEND_UNLOCK(stcb);
 367         asoc->streamoutcnt = asoc->pre_open_streams;
 368         if (asoc->strmout) {
 369                 for (i = 0; i < asoc->streamoutcnt; i++) {
 370                         asoc->strmout[i].state = SCTP_STREAM_OPEN;
 371                 }
 372         }
 373         /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
 374         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
 375         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
 376                 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 377         }
 378         /* This is the next one we expect */
 379         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 380
 381         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 382         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
 383
 384         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 385         /* open the requested streams */
 386
 387         if (asoc->strmin != NULL) {
 388                 /* Free the old ones */
 389                 for (i = 0; i < asoc->streamincnt; i++) {
 390                         sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
 391                         sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
 392                 }
 393                 SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
 394         }
 395         if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
 396                 asoc->streamincnt = ntohs(init->num_outbound_streams);
 397         } else {
 398                 asoc->streamincnt = asoc->max_inbound_streams;
 399         }
 400         SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 401             sizeof(struct sctp_stream_in), SCTP_M_STRMI);
 402         if (asoc->strmin == NULL) {
 403                 /* we didn't get memory for the streams! */
 404                 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
 405                 return (-1);
 406         }
 407         for (i = 0; i < asoc->streamincnt; i++) {
 408                 asoc->strmin[i].stream_no = i;
 409                 asoc->strmin[i].last_sequence_delivered = 0xffffffff;
 410                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 411                 TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
 412                 asoc->strmin[i].pd_api_started = 0;
 413                 asoc->strmin[i].delivery_started = 0;
 414         }
 415         /*
 416          * load_address_from_init will put the addresses into the
 417          * association when the COOKIE is processed or the INIT-ACK is
 418          * processed. Both types of COOKIE's existing and new call this
 419          * routine. It will remove addresses that are no longer in the
 420          * association (for the restarting case where addresses are
 421          * removed). Up front when the INIT arrives we will discard it if it
 422          * is a restart and new addresses have been added.
 423          */
 424         /* sa_ignore MEMLEAK */
 425         return (0);
 426 }
 427
 428 /*
 429  * INIT-ACK message processing/consumption returns value < 0 on error
 430  */
 431 static int
 432 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 433     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
 434     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 435     struct sctp_nets *net, int *abort_no_unlock,
 436     uint8_t mflowtype, uint32_t mflowid,
 437     uint32_t vrf_id)
 438 {
 439         struct sctp_association *asoc;
 440         struct mbuf *op_err;
 441         int retval, abort_flag;
 442         uint32_t initack_limit;
 443         int nat_friendly = 0;
 444
 445         /* First verify that we have no illegal param's */
 446         abort_flag = 0;
 447
 448         op_err = sctp_arethere_unrecognized_parameters(m,
 449             (offset + sizeof(struct sctp_init_chunk)),
 450             &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
 451         if (abort_flag) {
 452                 /* Send an abort and notify peer */
 453                 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 454                 *abort_no_unlock = 1;
 455                 return (-1);
 456         }
 457         asoc = &stcb->asoc;
 458         asoc->peer_supports_nat = (uint8_t) nat_friendly;
 459         /* process the peer's parameters in the INIT-ACK */
 460         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
 461         if (retval < 0) {
 462                 return (retval);
 463         }
 464         initack_limit = offset + ntohs(cp->ch.chunk_length);
 465         /* load all addresses */
 466         if ((retval = sctp_load_addresses_from_init(stcb, m,
 467             (offset + sizeof(struct sctp_init_chunk)), initack_limit,
 468             src, dst, NULL))) {
 469                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 470                     "Problem with address parameters");
 471                 SCTPDBG(SCTP_DEBUG_INPUT1,
 472                     "Load addresses from INIT causes an abort %d\n",
 473                     retval);
 474                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 475                     src, dst, sh, op_err,
 476                     mflowtype, mflowid,
 477                     vrf_id, net->port);
 478                 *abort_no_unlock = 1;
 479                 return (-1);
 480         }
 481         /* if the peer doesn't support asconf, flush the asconf queue */
 482         if (asoc->asconf_supported == 0) {
 483                 struct sctp_asconf_addr *param, *nparam;
 484
 485                 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
 486                         TAILQ_REMOVE(&asoc->asconf_queue, param, next);
 487                         SCTP_FREE(param, SCTP_M_ASC_ADDR);
 488                 }
 489         }
 490         stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
 491             stcb->asoc.local_hmacs);
 492         if (op_err) {
 493                 sctp_queue_op_err(stcb, op_err);
 494                 /* queuing will steal away the mbuf chain to the out queue */
 495                 op_err = NULL;
 496         }
 497         /* extract the cookie and queue it to "echo" it back... */
 498         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
 499                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
 500                     stcb->asoc.overall_error_count,
 501                     0,
 502                     SCTP_FROM_SCTP_INPUT,
 503                     __LINE__);
 504         }
 505         stcb->asoc.overall_error_count = 0;
 506         net->error_count = 0;
 507
 508         /*
 509          * Cancel the INIT timer, We do this first before queueing the
 510          * cookie. We always cancel at the primary to assue that we are
 511          * canceling the timer started by the INIT which always goes to the
 512          * primary.
 513          */
 514         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 515             asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
 516
 517         /* calculate the RTO */
 518         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
 519             SCTP_RTT_FROM_NON_DATA);
 520         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 521         if (retval < 0) {
 522                 /*
 523                  * No cookie, we probably should send a op error. But in any
 524                  * case if there is no cookie in the INIT-ACK, we can
 525                  * abandon the peer, its broke.
 526                  */
 527                 if (retval == -3) {
 528                         uint16_t len;
 529
 530                         len = (uint16_t) (sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
 531                         /* We abort with an error of missing mandatory param */
 532                         op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
 533                         if (op_err != NULL) {
 534                                 struct sctp_error_missing_param *cause;
 535
 536                                 SCTP_BUF_LEN(op_err) = len;
 537                                 cause = mtod(op_err, struct sctp_error_missing_param *);
 538                                 /* Subtract the reserved param */
 539                                 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
 540                                 cause->cause.length = htons(len);
 541                                 cause->num_missing_params = htonl(1);
 542                                 cause->type[0] = htons(SCTP_STATE_COOKIE);
 543                         }
 544                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 545                             src, dst, sh, op_err,
 546                             mflowtype, mflowid,
 547                             vrf_id, net->port);
 548                         *abort_no_unlock = 1;
 549                 }
 550                 return (retval);
 551         }
 552         return (0);
 553 }
 554
 555 static void
 556 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 557     struct sctp_tcb *stcb, struct sctp_nets *net)
 558 {
 559         union sctp_sockstore store;
 560         struct sctp_nets *r_net, *f_net;
 561         struct timeval tv;
 562         int req_prim = 0;
 563         uint16_t old_error_counter;
 564
 565         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 566                 /* Invalid length */
 567                 return;
 568         }
 569         memset(&store, 0, sizeof(store));
 570         switch (cp->heartbeat.hb_info.addr_family) {
 571 #ifdef INET
 572         case AF_INET:
 573                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 574                         store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
 575                         store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
 576                         store.sin.sin_port = stcb->rport;
 577                         memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
 578                             sizeof(store.sin.sin_addr));
 579                 } else {
 580                         return;
 581                 }
 582                 break;
 583 #endif
 584 #ifdef INET6
 585         case AF_INET6:
 586                 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 587                         store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
 588                         store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
 589                         store.sin6.sin6_port = stcb->rport;
 590                         memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
 591                 } else {
 592                         return;
 593                 }
 594                 break;
 595 #endif
 596         default:
 597                 return;
 598         }
 599         r_net = sctp_findnet(stcb, &store.sa);
 600         if (r_net == NULL) {
 601                 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
 602                 return;
 603         }
 604         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 605             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 606             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 607                 /*
 608                  * If the its a HB and it's random value is correct when can
 609                  * confirm the destination.
 610                  */
 611                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 612                 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
 613                         stcb->asoc.primary_destination = r_net;
 614                         r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
 615                         f_net = TAILQ_FIRST(&stcb->asoc.nets);
 616                         if (f_net != r_net) {
 617                                 /*
 618                                  * first one on the list is NOT the primary
 619                                  * sctp_cmpaddr() is much more efficent if
 620                                  * the primary is the first on the list,
 621                                  * make it so.
 622                                  */
 623                                 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
 624                                 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
 625                         }
 626                         req_prim = 1;
 627                 }
 628                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 629                     stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 630                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
 631                     r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
 632                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 633         }
 634         old_error_counter = r_net->error_count;
 635         r_net->error_count = 0;
 636         r_net->hb_responded = 1;
 637         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 638         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 639         /* Now lets do a RTO with this */
 640         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
 641             SCTP_RTT_FROM_NON_DATA);
 642         if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
 643                 r_net->dest_state |= SCTP_ADDR_REACHABLE;
 644                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 645                     0, (void *)r_net, SCTP_SO_NOT_LOCKED);
 646         }
 647         if (r_net->dest_state & SCTP_ADDR_PF) {
 648                 r_net->dest_state &= ~SCTP_ADDR_PF;
 649                 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
 650         }
 651         if (old_error_counter > 0) {
 652                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
 653                     stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
 654                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
 655         }
 656         if (r_net == stcb->asoc.primary_destination) {
 657                 if (stcb->asoc.alternate) {
 658                         /* release the alternate, primary is good */
 659                         sctp_free_remote_addr(stcb->asoc.alternate);
 660                         stcb->asoc.alternate = NULL;
 661                 }
 662         }
 663         /* Mobility adaptation */
 664         if (req_prim) {
 665                 if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
 666                     SCTP_MOBILITY_BASE) ||
 667                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 668                     SCTP_MOBILITY_FASTHANDOFF)) &&
 669                     sctp_is_mobility_feature_on(stcb->sctp_ep,
 670                     SCTP_MOBILITY_PRIM_DELETED)) {
 671
 672                         sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
 673                             stcb->sctp_ep, stcb, NULL,
 674                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
 675                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 676                             SCTP_MOBILITY_FASTHANDOFF)) {
 677                                 sctp_assoc_immediate_retrans(stcb,
 678                                     stcb->asoc.primary_destination);
 679                         }
 680                         if (sctp_is_mobility_feature_on(stcb->sctp_ep,
 681                             SCTP_MOBILITY_BASE)) {
 682                                 sctp_move_chunks_from_net(stcb,
 683                                     stcb->asoc.deleted_primary);
 684                         }
 685                         sctp_delete_prim_timer(stcb->sctp_ep, stcb,
 686                             stcb->asoc.deleted_primary);
 687                 }
 688         }
 689 }
 690
 691 static int
 692 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
 693 {
 694         /*
 695          * return 0 means we want you to proceed with the abort non-zero
 696          * means no abort processing
 697          */
 698         struct sctpasochead *head;
 699
 700         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
 701                 /* generate a new vtag and send init */
 702                 LIST_REMOVE(stcb, sctp_asocs);
 703                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 704                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 705                 /*
 706                  * put it in the bucket in the vtag hash of assoc's for the
 707                  * system
 708                  */
 709                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 710                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 711                 return (1);
 712         }
 713         if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
 714                 /*
 715                  * treat like a case where the cookie expired i.e.: - dump
 716                  * current cookie. - generate a new vtag. - resend init.
 717                  */
 718                 /* generate a new vtag and send init */
 719                 LIST_REMOVE(stcb, sctp_asocs);
 720                 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
 721                 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
 722                 sctp_stop_all_cookie_timers(stcb);
 723                 sctp_toss_old_cookies(stcb, &stcb->asoc);
 724                 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
 725                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
 726                 /*
 727                  * put it in the bucket in the vtag hash of assoc's for the
 728                  * system
 729                  */
 730                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
 731                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
 732                 return (1);
 733         }
 734         return (0);
 735 }
 736
 737 static int
 738 sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
 739     struct sctp_nets *net)
 740 {
 741         /*
 742          * return 0 means we want you to proceed with the abort non-zero
 743          * means no abort processing
 744          */
 745         if (stcb->asoc.auth_supported == 0) {
 746                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
 747                 return (0);
 748         }
 749         sctp_asconf_send_nat_state_update(stcb, net);
 750         return (1);
 751 }
 752
 753
 754 static void
 755 sctp_handle_abort(struct sctp_abort_chunk *abort,
 756     struct sctp_tcb *stcb, struct sctp_nets *net)
 757 {
 758 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 759         struct socket *so;
 760
 761 #endif
 762         uint16_t len;
 763         uint16_t error;
 764
 765         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
 766         if (stcb == NULL)
 767                 return;
 768
 769         len = ntohs(abort->ch.chunk_length);
 770         if (len > sizeof(struct sctp_chunkhdr)) {
 771                 /*
 772                  * Need to check the cause codes for our two magic nat
 773                  * aborts which don't kill the assoc necessarily.
 774                  */
 775                 struct sctp_gen_error_cause *cause;
 776
 777                 cause = (struct sctp_gen_error_cause *)(abort + 1);
 778                 error = ntohs(cause->code);
 779                 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
 780                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
 781                             abort->ch.chunk_flags);
 782                         if (sctp_handle_nat_colliding_state(stcb)) {
 783                                 return;
 784                         }
 785                 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
 786                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
 787                             abort->ch.chunk_flags);
 788                         if (sctp_handle_nat_missing_state(stcb, net)) {
 789                                 return;
 790                         }
 791                 }
 792         } else {
 793                 error = 0;
 794         }
 795         /* stop any receive timers */
 796         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
 797             SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
 798         /* notify user of the abort and clean up... */
 799         sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
 800         /* free the tcb */
 801         SCTP_STAT_INCR_COUNTER32(sctps_aborted);
 802         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
 803             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 804                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 805         }
 806 #ifdef SCTP_ASOCLOG_OF_TSNS
 807         sctp_print_out_track_log(stcb);
 808 #endif
 809 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 810         so = SCTP_INP_SO(stcb->sctp_ep);
 811         atomic_add_int(&stcb->asoc.refcnt, 1);
 812         SCTP_TCB_UNLOCK(stcb);
 813         SCTP_SOCKET_LOCK(so, 1);
 814         SCTP_TCB_LOCK(stcb);
 815         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 816 #endif
 817         stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
 818         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
 819             SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
 820 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 821         SCTP_SOCKET_UNLOCK(so, 1);
 822 #endif
 823         SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
 824 }
 825
 826 static void
 827 sctp_start_net_timers(struct sctp_tcb *stcb)
 828 {
 829         uint32_t cnt_hb_sent;
 830         struct sctp_nets *net;
 831
 832         cnt_hb_sent = 0;
 833         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 834                 /*
 835                  * For each network start: 1) A pmtu timer. 2) A HB timer 3)
 836                  * If the dest in unconfirmed send a hb as well if under
 837                  * max_hb_burst have been sent.
 838                  */
 839                 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
 840                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
 841                 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
 842                     (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
 843                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
 844                         cnt_hb_sent++;
 845                 }
 846         }
 847         if (cnt_hb_sent) {
 848                 sctp_chunk_output(stcb->sctp_ep, stcb,
 849                     SCTP_OUTPUT_FROM_COOKIE_ACK,
 850                     SCTP_SO_NOT_LOCKED);
 851         }
 852 }
 853
 854
 855 static void
 856 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 857     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 858 {
 859         struct sctp_association *asoc;
 860         int some_on_streamwheel;
 861         int old_state;
 862
 863 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 864         struct socket *so;
 865
 866 #endif
 867
 868         SCTPDBG(SCTP_DEBUG_INPUT2,
 869             "sctp_handle_shutdown: handling SHUTDOWN\n");
 870         if (stcb == NULL)
 871                 return;
 872         asoc = &stcb->asoc;
 873         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 874             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 875                 return;
 876         }
 877         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 878                 /* Shutdown NOT the expected size */
 879                 return;
 880         }
 881         old_state = SCTP_GET_STATE(asoc);
 882         sctp_update_acked(stcb, cp, abort_flag);
 883         if (*abort_flag) {
 884                 return;
 885         }
 886         if (asoc->control_pdapi) {
 887                 /*
 888                  * With a normal shutdown we assume the end of last record.
 889                  */
 890                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
 891                 if (asoc->control_pdapi->on_strm_q) {
 892                         struct sctp_stream_in *strm;
 893
 894                         strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
 895                         if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
 896                                 /* Unordered */
 897                                 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
 898                                 asoc->control_pdapi->on_strm_q = 0;
 899                         } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
 900                                 /* Ordered */
 901                                 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
 902                                 asoc->control_pdapi->on_strm_q = 0;
 903                         } else {
 904                                 panic("Unknown state on ctrl:%p on_strm_q:%d",
 905                                     asoc->control_pdapi,
 906                                     asoc->control_pdapi->on_strm_q);
 907                         }
 908                 }
 909                 printf("%s:%d End added to ctl:%p (%d)\n",
 910                     __FUNCTION__,
 911                     __LINE__,
 912                     asoc->control_pdapi,
 913                     asoc->control_pdapi->on_strm_q);
 914                 asoc->control_pdapi->end_added = 1;
 915                 asoc->control_pdapi->pdapi_aborted = 1;
 916                 asoc->control_pdapi = NULL;
 917                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
 918 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 919                 so = SCTP_INP_SO(stcb->sctp_ep);
 920                 atomic_add_int(&stcb->asoc.refcnt, 1);
 921                 SCTP_TCB_UNLOCK(stcb);
 922                 SCTP_SOCKET_LOCK(so, 1);
 923                 SCTP_TCB_LOCK(stcb);
 924                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 925                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 926                         /* assoc was freed while we were unlocked */
 927                         SCTP_SOCKET_UNLOCK(so, 1);
 928                         return;
 929                 }
 930 #endif
 931                 if (stcb->sctp_socket) {
 932                         sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
 933                 }
 934 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 935                 SCTP_SOCKET_UNLOCK(so, 1);
 936 #endif
 937         }
 938         /* goto SHUTDOWN_RECEIVED state to block new requests */
 939         if (stcb->sctp_socket) {
 940                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 941                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
 942                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 943                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
 944                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 945                         /*
 946                          * notify upper layer that peer has initiated a
 947                          * shutdown
 948                          */
 949                         sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
 950
 951                         /* reset time */
 952                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 953                 }
 954         }
 955         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 956                 /*
 957                  * stop the shutdown timer, since we WILL move to
 958                  * SHUTDOWN-ACK-SENT.
 959                  */
 960                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 961                     net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
 962         }
 963         /* Now is there unsent data on a stream somewhere? */
 964         some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 965
 966         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 967             !TAILQ_EMPTY(&asoc->sent_queue) ||
 968             some_on_streamwheel) {
 969                 /* By returning we will push more data out */
 970                 return;
 971         } else {
 972                 /* no outstanding data to send, so move on... */
 973                 /* send SHUTDOWN-ACK */
 974                 /* move to SHUTDOWN-ACK-SENT state */
 975                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 976                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
 977                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 978                 }
 979                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 980                 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
 981                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
 982                         sctp_stop_timers_for_shutdown(stcb);
 983                         sctp_send_shutdown_ack(stcb, net);
 984                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
 985                             stcb->sctp_ep, stcb, net);
 986                 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
 987                         sctp_send_shutdown_ack(stcb, net);
 988                 }
 989         }
 990 }
 991
 992 static void
 993 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
 994     struct sctp_tcb *stcb,
 995     struct sctp_nets *net)
 996 {
 997         struct sctp_association *asoc;
 998
 999 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1000         struct socket *so;
1001
1002         so = SCTP_INP_SO(stcb->sctp_ep);
1003 #endif
1004         SCTPDBG(SCTP_DEBUG_INPUT2,
1005             "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
1006         if (stcb == NULL)
1007                 return;
1008
1009         asoc = &stcb->asoc;
1010         /* process according to association state */
1011         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
1012             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
1013                 /* unexpected SHUTDOWN-ACK... do OOTB handling... */
1014                 sctp_send_shutdown_complete(stcb, net, 1);
1015                 SCTP_TCB_UNLOCK(stcb);
1016                 return;
1017         }
1018         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
1019             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
1020                 /* unexpected SHUTDOWN-ACK... so ignore... */
1021                 SCTP_TCB_UNLOCK(stcb);
1022                 return;
1023         }
1024         if (asoc->control_pdapi) {
1025                 /*
1026                  * With a normal shutdown we assume the end of last record.
1027                  */
1028                 SCTP_INP_READ_LOCK(stcb->sctp_ep);
1029                 printf("%s:%d End added to ctl:%p (%d)\n",
1030                     __FUNCTION__,
1031                     __LINE__,
1032                     asoc->control_pdapi,
1033                     asoc->control_pdapi->on_strm_q);
1034                 asoc->control_pdapi->end_added = 1;
1035                 asoc->control_pdapi->pdapi_aborted = 1;
1036                 asoc->control_pdapi = NULL;
1037                 SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
1038 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1039                 atomic_add_int(&stcb->asoc.refcnt, 1);
1040                 SCTP_TCB_UNLOCK(stcb);
1041                 SCTP_SOCKET_LOCK(so, 1);
1042                 SCTP_TCB_LOCK(stcb);
1043                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
1044                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1045                         /* assoc was freed while we were unlocked */
1046                         SCTP_SOCKET_UNLOCK(so, 1);
1047                         return;
1048                 }
1049 #endif
1050                 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
1051 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1052                 SCTP_SOCKET_UNLOCK(so, 1);
1053 #endif
1054         }
1055 #ifdef INVARIANTS
1056         if (!TAILQ_EMPTY(&asoc->send_queue) ||
1057             !TAILQ_EMPTY(&asoc->sent_queue) ||
1058             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
1059                 panic("Queues are not empty when handling SHUTDOWN-ACK");
1060         }
1061 #endif
1062         /* stop the timer */
1063         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
1064             SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
1065         /* send SHUTDOWN-COMPLETE */
1066         sctp_send_shutdown_complete(stcb, net, 0);
1067         /* notify upper layer protocol */
1068         if (stcb->sctp_socket) {
1069                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1070                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
1071                         stcb->sctp_socket->so_snd.sb_cc = 0;
1072                 }
1073                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
1074         }
1075         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
1076         /* free the TCB but first save off the ep */
1077 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1078         atomic_add_int(&stcb->asoc.refcnt, 1);
1079         SCTP_TCB_UNLOCK(stcb);
1080         SCTP_SOCKET_LOCK(so, 1);
1081         SCTP_TCB_LOCK(stcb);
1082         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1083 #endif
1084         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1085             SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
1086 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1087         SCTP_SOCKET_UNLOCK(so, 1);
1088 #endif
1089 }
1090
1091 /*
1092  * Skip past the param header and then we will find the chunk that caused the
1093  * problem. There are two possiblities ASCONF or FWD-TSN other than that and
1094  * our peer must be broken.
1095  */
1096 static void
1097 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
1098     struct sctp_nets *net)
1099 {
1100         struct sctp_chunkhdr *chk;
1101
1102         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
1103         switch (chk->chunk_type) {
1104         case SCTP_ASCONF_ACK:
1105         case SCTP_ASCONF:
1106                 sctp_asconf_cleanup(stcb, net);
1107                 break;
1108         case SCTP_IFORWARD_CUM_TSN:
1109         case SCTP_FORWARD_CUM_TSN:
1110                 stcb->asoc.prsctp_supported = 0;
1111                 break;
1112         default:
1113                 SCTPDBG(SCTP_DEBUG_INPUT2,
1114                     "Peer does not support chunk type %d(%x)??\n",
1115                     chk->chunk_type, (uint32_t) chk->chunk_type);
1116                 break;
1117         }
1118 }
1119
1120 /*
1121  * Skip past the param header and then we will find the param that caused the
1122  * problem.  There are a number of param's in a ASCONF OR the prsctp param
1123  * these will turn of specific features.
1124  * XXX: Is this the right thing to do?
1125  */
1126 static void
1127 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
1128 {
1129         struct sctp_paramhdr *pbad;
1130
1131         pbad = phdr + 1;
1132         switch (ntohs(pbad->param_type)) {
1133                 /* pr-sctp draft */
1134         case SCTP_PRSCTP_SUPPORTED:
1135                 stcb->asoc.prsctp_supported = 0;
1136                 break;
1137         case SCTP_SUPPORTED_CHUNK_EXT:
1138                 break;
1139                 /* draft-ietf-tsvwg-addip-sctp */
1140         case SCTP_HAS_NAT_SUPPORT:
1141                 stcb->asoc.peer_supports_nat = 0;
1142                 break;
1143         case SCTP_ADD_IP_ADDRESS:
1144         case SCTP_DEL_IP_ADDRESS:
1145         case SCTP_SET_PRIM_ADDR:
1146                 stcb->asoc.asconf_supported = 0;
1147                 break;
1148         case SCTP_SUCCESS_REPORT:
1149         case SCTP_ERROR_CAUSE_IND:
1150                 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
1151                 SCTPDBG(SCTP_DEBUG_INPUT2,
1152                     "Turning off ASCONF to this strange peer\n");
1153                 stcb->asoc.asconf_supported = 0;
1154                 break;
1155         default:
1156                 SCTPDBG(SCTP_DEBUG_INPUT2,
1157                     "Peer does not support param type %d(%x)??\n",
1158                     pbad->param_type, (uint32_t) pbad->param_type);
1159                 break;
1160         }
1161 }
1162
1163 static int
1164 sctp_handle_error(struct sctp_chunkhdr *ch,
1165     struct sctp_tcb *stcb, struct sctp_nets *net)
1166 {
1167         int chklen;
1168         struct sctp_paramhdr *phdr;
1169         uint16_t error, error_type;
1170         uint16_t error_len;
1171         struct sctp_association *asoc;
1172         int adjust;
1173
1174 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1175         struct socket *so;
1176
1177 #endif
1178
1179         /* parse through all of the errors and process */
1180         asoc = &stcb->asoc;
1181         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
1182             sizeof(struct sctp_chunkhdr));
1183         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
1184         error = 0;
1185         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
1186                 /* Process an Error Cause */
1187                 error_type = ntohs(phdr->param_type);
1188                 error_len = ntohs(phdr->param_length);
1189                 if ((error_len > chklen) || (error_len == 0)) {
1190                         /* invalid param length for this param */
1191                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
1192                             chklen, error_len);
1193                         return (0);
1194                 }
1195                 if (error == 0) {
1196                         /* report the first error cause */
1197                         error = error_type;
1198                 }
1199                 switch (error_type) {
1200                 case SCTP_CAUSE_INVALID_STREAM:
1201                 case SCTP_CAUSE_MISSING_PARAM:
1202                 case SCTP_CAUSE_INVALID_PARAM:
1203                 case SCTP_CAUSE_NO_USER_DATA:
1204                         SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
1205                             error_type);
1206                         break;
1207                 case SCTP_CAUSE_NAT_COLLIDING_STATE:
1208                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
1209                             ch->chunk_flags);
1210                         if (sctp_handle_nat_colliding_state(stcb)) {
1211                                 return (0);
1212                         }
1213                         break;
1214                 case SCTP_CAUSE_NAT_MISSING_STATE:
1215                         SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
1216                             ch->chunk_flags);
1217                         if (sctp_handle_nat_missing_state(stcb, net)) {
1218                                 return (0);
1219                         }
1220                         break;
1221                 case SCTP_CAUSE_STALE_COOKIE:
1222                         /*
1223                          * We only act if we have echoed a cookie and are
1224                          * waiting.
1225                          */
1226                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
1227                                 int *p;
1228
1229                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
1230                                 /* Save the time doubled */
1231                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
1232                                 asoc->stale_cookie_count++;
1233                                 if (asoc->stale_cookie_count >
1234                                     asoc->max_init_times) {
1235                                         sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
1236                                         /* now free the asoc */
1237 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1238                                         so = SCTP_INP_SO(stcb->sctp_ep);
1239                                         atomic_add_int(&stcb->asoc.refcnt, 1);
1240                                         SCTP_TCB_UNLOCK(stcb);
1241                                         SCTP_SOCKET_LOCK(so, 1);
1242                                         SCTP_TCB_LOCK(stcb);
1243                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
1244 #endif
1245                                         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
1246                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
1247 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1248                                         SCTP_SOCKET_UNLOCK(so, 1);
1249 #endif
1250                                         return (-1);
1251                                 }
1252                                 /* blast back to INIT state */
1253                                 sctp_toss_old_cookies(stcb, &stcb->asoc);
1254                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
1255                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
1256                                 sctp_stop_all_cookie_timers(stcb);
1257                                 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
1258                         }
1259                         break;
1260                 case SCTP_CAUSE_UNRESOLVABLE_ADDR:
1261                         /*
1262                          * Nothing we can do here, we don't do hostname
1263                          * addresses so if the peer does not like my IPv6
1264                          * (or IPv4 for that matter) it does not matter. If
1265                          * they don't support that type of address, they can
1266                          * NOT possibly get that packet type... i.e. with no
1267                          * IPv6 you can't recieve a IPv6 packet. so we can
1268                          * safely ignore this one. If we ever added support
1269                          * for HOSTNAME Addresses, then we would need to do
1270                          * something here.
1271                          */
1272                         break;
1273                 case SCTP_CAUSE_UNRECOG_CHUNK:
1274                         sctp_process_unrecog_chunk(stcb, phdr, net);
1275                         break;
1276                 case SCTP_CAUSE_UNRECOG_PARAM:
1277                         sctp_process_unrecog_param(stcb, phdr);
1278                         break;
1279                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
1280                         /*
1281                          * We ignore this since the timer will drive out a
1282                          * new cookie anyway and there timer will drive us
1283                          * to send a SHUTDOWN_COMPLETE. We can't send one
1284                          * here since we don't have their tag.
1285                          */
1286                         break;
1287                 case SCTP_CAUSE_DELETING_LAST_ADDR:
1288                 case SCTP_CAUSE_RESOURCE_SHORTAGE:
1289                 case SCTP_CAUSE_DELETING_SRC_ADDR:
1290                         /*
1291                          * We should NOT get these here, but in a
1292                          * ASCONF-ACK.
1293                          */
1294                         SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
1295                             error_type);
1296                         break;
1297                 case SCTP_CAUSE_OUT_OF_RESC:
1298                         /*
1299                          * And what, pray tell do we do with the fact that
1300                          * the peer is out of resources? Not really sure we
1301                          * could do anything but abort. I suspect this
1302                          * should have came WITH an abort instead of in a
1303                          * OP-ERROR.
1304                          */
1305                         break;
1306                 default:
1307                         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
1308                             error_type);
1309                         break;
1310                 }
1311                 adjust = SCTP_SIZE32(error_len);
1312                 chklen -= adjust;
1313                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
1314         }
1315         sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
1316         return (0);
1317 }
1318
1319 static int
1320 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
1321     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
1322     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
1323     struct sctp_nets *net, int *abort_no_unlock,
1324     uint8_t mflowtype, uint32_t mflowid,
1325     uint32_t vrf_id)
1326 {
1327         struct sctp_init_ack *init_ack;
1328         struct mbuf *op_err;
1329
1330         SCTPDBG(SCTP_DEBUG_INPUT2,
1331             "sctp_handle_init_ack: handling INIT-ACK\n");
1332
1333         if (stcb == NULL) {
1334                 SCTPDBG(SCTP_DEBUG_INPUT2,
1335                     "sctp_handle_init_ack: TCB is null\n");
1336                 return (-1);
1337         }
1338         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
1339                 /* Invalid length */
1340                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1341                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1342                     src, dst, sh, op_err,
1343                     mflowtype, mflowid,
1344                     vrf_id, net->port);
1345                 *abort_no_unlock = 1;
1346                 return (-1);
1347         }
1348         init_ack = &cp->init;
1349         /* validate parameters */
1350         if (init_ack->initiate_tag == 0) {
1351                 /* protocol error... send an abort */
1352                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1353                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1354                     src, dst, sh, op_err,
1355                     mflowtype, mflowid,
1356                     vrf_id, net->port);
1357                 *abort_no_unlock = 1;
1358                 return (-1);
1359         }
1360         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
1361                 /* protocol error... send an abort */
1362                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1363                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1364                     src, dst, sh, op_err,
1365                     mflowtype, mflowid,
1366                     vrf_id, net->port);
1367                 *abort_no_unlock = 1;
1368                 return (-1);
1369         }
1370         if (init_ack->num_inbound_streams == 0) {
1371                 /* protocol error... send an abort */
1372                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1373                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1374                     src, dst, sh, op_err,
1375                     mflowtype, mflowid,
1376                     vrf_id, net->port);
1377                 *abort_no_unlock = 1;
1378                 return (-1);
1379         }
1380         if (init_ack->num_outbound_streams == 0) {
1381                 /* protocol error... send an abort */
1382                 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
1383                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
1384                     src, dst, sh, op_err,
1385                     mflowtype, mflowid,
1386                     vrf_id, net->port);
1387                 *abort_no_unlock = 1;
1388                 return (-1);
1389         }
1390         /* process according to association state... */
1391         switch (stcb->asoc.state & SCTP_STATE_MASK) {
1392         case SCTP_STATE_COOKIE_WAIT:
1393                 /* this is the expected state for this chunk */
1394                 /* process the INIT-ACK parameters */
1395                 if (stcb->asoc.primary_destination->dest_state &
1396                     SCTP_ADDR_UNCONFIRMED) {
1397                         /*
1398                          * The primary is where we sent the INIT, we can
1399                          * always consider it confirmed when the INIT-ACK is
1400                          * returned. Do this before we load addresses
1401                          * though.
1402                          */
1403                         stcb->asoc.primary_destination->dest_state &=
1404                             ~SCTP_ADDR_UNCONFIRMED;
1405                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
1406                             stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
1407                 }
1408                 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
1409                     net, abort_no_unlock,
1410                     mflowtype, mflowid,
1411                     vrf_id) < 0) {
1412                         /* error in parsing parameters */
1413                         return (-1);
1414                 }
1415                 /* update our state */
1416                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
1417                 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
1418
1419                 /* reset the RTO calc */
1420                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
1421                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
1422                             stcb->asoc.overall_error_count,
1423                             0,
1424                             SCTP_FROM_SCTP_INPUT,
1425                             __LINE__);
1426                 }
1427                 stcb->asoc.overall_error_count = 0;
1428                 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1429                 /*
1430                  * collapse the init timer back in case of a exponential
1431                  * backoff
1432                  */
1433                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1434                     stcb, net);
1435                 /*
1436                  * the send at the end of the inbound data processing will
1437                  * cause the cookie to be sent
1438                  */
1439                 break;
1440         case SCTP_STATE_SHUTDOWN_SENT:
1441                 /* incorrect state... discard */
1442                 break;
1443         case SCTP_STATE_COOKIE_ECHOED:
1444                 /* incorrect state... discard */
1445                 break;
1446         case SCTP_STATE_OPEN:
1447                 /* incorrect state... discard */
1448                 break;
1449         case SCTP_STATE_EMPTY:
1450         case SCTP_STATE_INUSE:
1451         default:
1452                 /* incorrect state... discard */
1453                 return (-1);
1454                 break;
1455         }
1456         SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
1457         return (0);
1458 }
1459
1460 static struct sctp_tcb *
1461 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1462     struct sockaddr *src, struct sockaddr *dst,
1463     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1464     struct sctp_inpcb *inp, struct sctp_nets **netp,
1465     struct sockaddr *init_src, int *notification,
1466     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1467     uint8_t mflowtype, uint32_t mflowid,
1468     uint32_t vrf_id, uint16_t port);
1469
1470
1471 /*
1472  * handle a state cookie for an existing association m: input packet mbuf
1473  * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
1474  * "split" mbuf and the cookie signature does not exist offset: offset into
1475  * mbuf to the cookie-echo chunk
1476  */
1477 static struct sctp_tcb *
1478 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1479     struct sockaddr *src, struct sockaddr *dst,
1480     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1481     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
1482     struct sockaddr *init_src, int *notification,
1483     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
1484     uint8_t mflowtype, uint32_t mflowid,
1485     uint32_t vrf_id, uint16_t port)
1486 {
1487         struct sctp_association *asoc;
1488         struct sctp_init_chunk *init_cp, init_buf;
1489         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1490         struct sctp_nets *net;
1491         struct mbuf *op_err;
1492         int init_offset, initack_offset, i;
1493         int retval;
1494         int spec_flag = 0;
1495         uint32_t how_indx;
1496
1497 #if defined(SCTP_DETAILED_STR_STATS)
1498         int j;
1499
1500 #endif
1501
1502         net = *netp;
1503         /* I know that the TCB is non-NULL from the caller */
1504         asoc = &stcb->asoc;
1505         for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
1506                 if (asoc->cookie_how[how_indx] == 0)
1507                         break;
1508         }
1509         if (how_indx < sizeof(asoc->cookie_how)) {
1510                 asoc->cookie_how[how_indx] = 1;
1511         }
1512         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1513                 /* SHUTDOWN came in after sending INIT-ACK */
1514                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1515                 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
1516                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
1517                     mflowtype, mflowid, inp->fibnum,
1518                     vrf_id, net->port);
1519                 if (how_indx < sizeof(asoc->cookie_how))
1520                         asoc->cookie_how[how_indx] = 2;
1521                 return (NULL);
1522         }
1523         /*
1524          * find and validate the INIT chunk in the cookie (peer's info) the
1525          * INIT should start after the cookie-echo header struct (chunk
1526          * header, state cookie header struct)
1527          */
1528         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1529
1530         init_cp = (struct sctp_init_chunk *)
1531             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1532             (uint8_t *) & init_buf);
1533         if (init_cp == NULL) {
1534                 /* could not pull a INIT chunk in cookie */
1535                 return (NULL);
1536         }
1537         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1538                 return (NULL);
1539         }
1540         /*
1541          * find and validate the INIT-ACK chunk in the cookie (my info) the
1542          * INIT-ACK follows the INIT chunk
1543          */
1544         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
1545         initack_cp = (struct sctp_init_ack_chunk *)
1546             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1547             (uint8_t *) & initack_buf);
1548         if (initack_cp == NULL) {
1549                 /* could not pull INIT-ACK chunk in cookie */
1550                 return (NULL);
1551         }
1552         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1553                 return (NULL);
1554         }
1555         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1556             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1557                 /*
1558                  * case D in Section 5.2.4 Table 2: MMAA process accordingly
1559                  * to get into the OPEN state
1560                  */
1561                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1562                         /*-
1563                          * Opps, this means that we somehow generated two vtag's
1564                          * the same. I.e. we did:
1565                          *  Us               Peer
1566                          *   <---INIT(tag=a)------
1567                          *   ----INIT-ACK(tag=t)-->
1568                          *   ----INIT(tag=t)------> *1
1569                          *   <---INIT-ACK(tag=a)---
1570                          *   <----CE(tag=t)------------- *2
1571                          *
1572                          * At point *1 we should be generating a different
1573                          * tag t'. Which means we would throw away the CE and send
1574                          * ours instead. Basically this is case C (throw away side).
1575                          */
1576                         if (how_indx < sizeof(asoc->cookie_how))
1577                                 asoc->cookie_how[how_indx] = 17;
1578                         return (NULL);
1579
1580                 }
1581                 switch (SCTP_GET_STATE(asoc)) {
1582                 case SCTP_STATE_COOKIE_WAIT:
1583                 case SCTP_STATE_COOKIE_ECHOED:
1584                         /*
1585                          * INIT was sent but got a COOKIE_ECHO with the
1586                          * correct tags... just accept it...but we must
1587                          * process the init so that we can make sure we have
1588                          * the right seq no's.
1589                          */
1590                         /* First we must process the INIT !! */
1591                         retval = sctp_process_init(init_cp, stcb);
1592                         if (retval < 0) {
1593                                 if (how_indx < sizeof(asoc->cookie_how))
1594                                         asoc->cookie_how[how_indx] = 3;
1595                                 return (NULL);
1596                         }
1597                         /* we have already processed the INIT so no problem */
1598                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
1599                             stcb, net,
1600                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
1601                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
1602                             stcb, net,
1603                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
1604                         /* update current state */
1605                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1606                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1607                         else
1608                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1609
1610                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1611                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1612                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1613                                     stcb->sctp_ep, stcb, asoc->primary_destination);
1614                         }
1615                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1616                         sctp_stop_all_cookie_timers(stcb);
1617                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1618                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1619                             (inp->sctp_socket->so_qlimit == 0)
1620                             ) {
1621 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1622                                 struct socket *so;
1623
1624 #endif
1625                                 /*
1626                                  * Here is where collision would go if we
1627                                  * did a connect() and instead got a
1628                                  * init/init-ack/cookie done before the
1629                                  * init-ack came back..
1630                                  */
1631                                 stcb->sctp_ep->sctp_flags |=
1632                                     SCTP_PCB_FLAGS_CONNECTED;
1633 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1634                                 so = SCTP_INP_SO(stcb->sctp_ep);
1635                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1636                                 SCTP_TCB_UNLOCK(stcb);
1637                                 SCTP_SOCKET_LOCK(so, 1);
1638                                 SCTP_TCB_LOCK(stcb);
1639                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1640                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1641                                         SCTP_SOCKET_UNLOCK(so, 1);
1642                                         return (NULL);
1643                                 }
1644 #endif
1645                                 soisconnected(stcb->sctp_socket);
1646 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1647                                 SCTP_SOCKET_UNLOCK(so, 1);
1648 #endif
1649                         }
1650                         /* notify upper layer */
1651                         *notification = SCTP_NOTIFY_ASSOC_UP;
1652                         /*
1653                          * since we did not send a HB make sure we don't
1654                          * double things
1655                          */
1656                         net->hb_responded = 1;
1657                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
1658                             &cookie->time_entered,
1659                             sctp_align_unsafe_makecopy,
1660                             SCTP_RTT_FROM_NON_DATA);
1661
1662                         if (stcb->asoc.sctp_autoclose_ticks &&
1663                             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
1664                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1665                                     inp, stcb, NULL);
1666                         }
1667                         break;
1668                 default:
1669                         /*
1670                          * we're in the OPEN state (or beyond), so peer must
1671                          * have simply lost the COOKIE-ACK
1672                          */
1673                         break;
1674                 }               /* end switch */
1675                 sctp_stop_all_cookie_timers(stcb);
1676                 /*
1677                  * We ignore the return code here.. not sure if we should
1678                  * somehow abort.. but we do have an existing asoc. This
1679                  * really should not fail.
1680                  */
1681                 if (sctp_load_addresses_from_init(stcb, m,
1682                     init_offset + sizeof(struct sctp_init_chunk),
1683                     initack_offset, src, dst, init_src)) {
1684                         if (how_indx < sizeof(asoc->cookie_how))
1685                                 asoc->cookie_how[how_indx] = 4;
1686                         return (NULL);
1687                 }
1688                 /* respond with a COOKIE-ACK */
1689                 sctp_toss_old_cookies(stcb, asoc);
1690                 sctp_send_cookie_ack(stcb);
1691                 if (how_indx < sizeof(asoc->cookie_how))
1692                         asoc->cookie_how[how_indx] = 5;
1693                 return (stcb);
1694         }
1695         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1696             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1697             cookie->tie_tag_my_vtag == 0 &&
1698             cookie->tie_tag_peer_vtag == 0) {
1699                 /*
1700                  * case C in Section 5.2.4 Table 2: XMOO silently discard
1701                  */
1702                 if (how_indx < sizeof(asoc->cookie_how))
1703                         asoc->cookie_how[how_indx] = 6;
1704                 return (NULL);
1705         }
1706         /*
1707          * If nat support, and the below and stcb is established, send back
1708          * a ABORT(colliding state) if we are established.
1709          */
1710         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
1711             (asoc->peer_supports_nat) &&
1712             ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1713             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1714             (asoc->peer_vtag == 0)))) {
1715                 /*
1716                  * Special case - Peer's support nat. We may have two init's
1717                  * that we gave out the same tag on since one was not
1718                  * established.. i.e. we get INIT from host-1 behind the nat
1719                  * and we respond tag-a, we get a INIT from host-2 behind
1720                  * the nat and we get tag-a again. Then we bring up host-1
1721                  * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1).
1722                  * Now we have colliding state. We must send an abort here
1723                  * with colliding state indication.
1724                  */
1725                 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
1726                 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
1727                     mflowtype, mflowid, inp->fibnum,
1728                     vrf_id, port);
1729                 return (NULL);
1730         }
1731         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1732             ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
1733             (asoc->peer_vtag == 0))) {
1734                 /*
1735                  * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
1736                  * should be ok, re-accept peer info
1737                  */
1738                 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
1739                         /*
1740                          * Extension of case C. If we hit this, then the
1741                          * random number generator returned the same vtag
1742                          * when we first sent our INIT-ACK and when we later
1743                          * sent our INIT. The side with the seq numbers that
1744                          * are different will be the one that normnally
1745                          * would have hit case C. This in effect "extends"
1746                          * our vtags in this collision case to be 64 bits.
1747                          * The same collision could occur aka you get both
1748                          * vtag and seq number the same twice in a row.. but
1749                          * is much less likely. If it did happen then we
1750                          * would proceed through and bring up the assoc.. we
1751                          * may end up with the wrong stream setup however..
1752                          * which would be bad.. but there is no way to
1753                          * tell.. until we send on a stream that does not
1754                          * exist :-)
1755                          */
1756                         if (how_indx < sizeof(asoc->cookie_how))
1757                                 asoc->cookie_how[how_indx] = 7;
1758
1759                         return (NULL);
1760                 }
1761                 if (how_indx < sizeof(asoc->cookie_how))
1762                         asoc->cookie_how[how_indx] = 8;
1763                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1764                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
1765                 sctp_stop_all_cookie_timers(stcb);
1766                 /*
1767                  * since we did not send a HB make sure we don't double
1768                  * things
1769                  */
1770                 net->hb_responded = 1;
1771                 if (stcb->asoc.sctp_autoclose_ticks &&
1772                     sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
1773                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1774                             NULL);
1775                 }
1776                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1777                 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1778
1779                 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
1780                         /*
1781                          * Ok the peer probably discarded our data (if we
1782                          * echoed a cookie+data). So anything on the
1783                          * sent_queue should be marked for retransmit, we
1784                          * may not get something to kick us so it COULD
1785                          * still take a timeout to move these.. but it can't
1786                          * hurt to mark them.
1787                          */
1788                         struct sctp_tmit_chunk *chk;
1789
1790                         TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
1791                                 if (chk->sent < SCTP_DATAGRAM_RESEND) {
1792                                         chk->sent = SCTP_DATAGRAM_RESEND;
1793                                         sctp_flight_size_decrease(chk);
1794                                         sctp_total_flight_decrease(stcb, chk);
1795                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
1796                                         spec_flag++;
1797                                 }
1798                         }
1799
1800                 }
1801                 /* process the INIT info (peer's info) */
1802                 retval = sctp_process_init(init_cp, stcb);
1803                 if (retval < 0) {
1804                         if (how_indx < sizeof(asoc->cookie_how))
1805                                 asoc->cookie_how[how_indx] = 9;
1806                         return (NULL);
1807                 }
1808                 if (sctp_load_addresses_from_init(stcb, m,
1809                     init_offset + sizeof(struct sctp_init_chunk),
1810                     initack_offset, src, dst, init_src)) {
1811                         if (how_indx < sizeof(asoc->cookie_how))
1812                                 asoc->cookie_how[how_indx] = 10;
1813                         return (NULL);
1814                 }
1815                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1816                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1817                         *notification = SCTP_NOTIFY_ASSOC_UP;
1818
1819                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1820                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1821                             (inp->sctp_socket->so_qlimit == 0)) {
1822 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1823                                 struct socket *so;
1824
1825 #endif
1826                                 stcb->sctp_ep->sctp_flags |=
1827                                     SCTP_PCB_FLAGS_CONNECTED;
1828 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1829                                 so = SCTP_INP_SO(stcb->sctp_ep);
1830                                 atomic_add_int(&stcb->asoc.refcnt, 1);
1831                                 SCTP_TCB_UNLOCK(stcb);
1832                                 SCTP_SOCKET_LOCK(so, 1);
1833                                 SCTP_TCB_LOCK(stcb);
1834                                 atomic_add_int(&stcb->asoc.refcnt, -1);
1835                                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
1836                                         SCTP_SOCKET_UNLOCK(so, 1);
1837                                         return (NULL);
1838                                 }
1839 #endif
1840                                 soisconnected(stcb->sctp_socket);
1841 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1842                                 SCTP_SOCKET_UNLOCK(so, 1);
1843 #endif
1844                         }
1845                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
1846                                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
1847                         else
1848                                 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1849                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1850                 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1851                         SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
1852                 } else {
1853                         SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
1854                 }
1855                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1856                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1857                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1858                             stcb->sctp_ep, stcb, asoc->primary_destination);
1859                 }
1860                 sctp_stop_all_cookie_timers(stcb);
1861                 sctp_toss_old_cookies(stcb, asoc);
1862                 sctp_send_cookie_ack(stcb);
1863                 if (spec_flag) {
1864                         /*
1865                          * only if we have retrans set do we do this. What
1866                          * this call does is get only the COOKIE-ACK out and
1867                          * then when we return the normal call to
1868                          * sctp_chunk_output will get the retrans out behind
1869                          * this.
1870                          */
1871                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
1872                 }
1873                 if (how_indx < sizeof(asoc->cookie_how))
1874                         asoc->cookie_how[how_indx] = 11;
1875
1876                 return (stcb);
1877         }
1878         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1879             ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1880             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1881             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1882             cookie->tie_tag_peer_vtag != 0) {
1883                 struct sctpasochead *head;
1884
1885 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1886                 struct socket *so;
1887
1888 #endif
1889
1890                 if (asoc->peer_supports_nat) {
1891                         /*
1892                          * This is a gross gross hack. Just call the
1893                          * cookie_new code since we are allowing a duplicate
1894                          * association. I hope this works...
1895                          */
1896                         return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
1897                             sh, cookie, cookie_len,
1898                             inp, netp, init_src, notification,
1899                             auth_skipped, auth_offset, auth_len,
1900                             mflowtype, mflowid,
1901                             vrf_id, port));
1902                 }
1903                 /*
1904                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1905                  */
1906                 /* temp code */
1907                 if (how_indx < sizeof(asoc->cookie_how))
1908                         asoc->cookie_how[how_indx] = 12;
1909                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
1910                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
1911                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
1912                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
1913
1914                 /* notify upper layer */
1915                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1916                 atomic_add_int(&stcb->asoc.refcnt, 1);
1917                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
1918                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
1919                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
1920                         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
1921                 }
1922                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
1923                         SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
1924                 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
1925                         SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
1926                 }
1927                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1928                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1929                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
1930                             stcb->sctp_ep, stcb, asoc->primary_destination);
1931
1932                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1933                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1934                         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
1935                 }
1936                 asoc->pre_open_streams =
1937                     ntohs(initack_cp->init.num_outbound_streams);
1938                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1939                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1940                 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
1941
1942                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1943
1944                 asoc->str_reset_seq_in = asoc->init_seq_number;
1945
1946                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1947                 if (asoc->mapping_array) {
1948                         memset(asoc->mapping_array, 0,
1949                             asoc->mapping_array_size);
1950                 }
1951                 if (asoc->nr_mapping_array) {
1952                         memset(asoc->nr_mapping_array, 0,
1953                             asoc->mapping_array_size);
1954                 }
1955                 SCTP_TCB_UNLOCK(stcb);
1956 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
1957                 so = SCTP_INP_SO(stcb->sctp_ep);
1958                 SCTP_SOCKET_LOCK(so, 1);
1959 #endif
1960                 SCTP_INP_INFO_WLOCK();
1961                 SCTP_INP_WLOCK(stcb->sctp_ep);
1962                 SCTP_TCB_LOCK(stcb);
1963                 atomic_add_int(&stcb->asoc.refcnt, -1);
1964                 /* send up all the data */
1965                 SCTP_TCB_SEND_LOCK(stcb);
1966
1967                 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
1968                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
1969                         stcb->asoc.strmout[i].chunks_on_queues = 0;
1970 #if defined(SCTP_DETAILED_STR_STATS)
1971                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
1972                                 asoc->strmout[i].abandoned_sent[j] = 0;
1973                                 asoc->strmout[i].abandoned_unsent[j] = 0;
1974                         }
1975 #else
1976                         asoc->strmout[i].abandoned_sent[0] = 0;
1977                         asoc->strmout[i].abandoned_unsent[0] = 0;
1978 #endif
1979                         stcb->asoc.strmout[i].stream_no = i;
1980                         stcb->asoc.strmout[i].next_sequence_send = 0;
1981                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
1982                 }
1983                 /* process the INIT-ACK info (my info) */
1984                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1985                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1986
1987                 /* pull from vtag hash */
1988                 LIST_REMOVE(stcb, sctp_asocs);
1989                 /* re-insert to new vtag position */
1990                 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
1991                     SCTP_BASE_INFO(hashasocmark))];
1992                 /*
1993                  * put it in the bucket in the vtag hash of assoc's for the
1994                  * system
1995                  */
1996                 LIST_INSERT_HEAD(head, stcb, sctp_asocs);
1997
1998                 SCTP_TCB_SEND_UNLOCK(stcb);
1999                 SCTP_INP_WUNLOCK(stcb->sctp_ep);
2000                 SCTP_INP_INFO_WUNLOCK();
2001 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2002                 SCTP_SOCKET_UNLOCK(so, 1);
2003 #endif
2004                 asoc->total_flight = 0;
2005                 asoc->total_flight_count = 0;
2006                 /* process the INIT info (peer's info) */
2007                 retval = sctp_process_init(init_cp, stcb);
2008                 if (retval < 0) {
2009                         if (how_indx < sizeof(asoc->cookie_how))
2010                                 asoc->cookie_how[how_indx] = 13;
2011
2012                         return (NULL);
2013                 }
2014                 /*
2015                  * since we did not send a HB make sure we don't double
2016                  * things
2017                  */
2018                 net->hb_responded = 1;
2019
2020                 if (sctp_load_addresses_from_init(stcb, m,
2021                     init_offset + sizeof(struct sctp_init_chunk),
2022                     initack_offset, src, dst, init_src)) {
2023                         if (how_indx < sizeof(asoc->cookie_how))
2024                                 asoc->cookie_how[how_indx] = 14;
2025
2026                         return (NULL);
2027                 }
2028                 /* respond with a COOKIE-ACK */
2029                 sctp_stop_all_cookie_timers(stcb);
2030                 sctp_toss_old_cookies(stcb, asoc);
2031                 sctp_send_cookie_ack(stcb);
2032                 if (how_indx < sizeof(asoc->cookie_how))
2033                         asoc->cookie_how[how_indx] = 15;
2034
2035                 return (stcb);
2036         }
2037         if (how_indx < sizeof(asoc->cookie_how))
2038                 asoc->cookie_how[how_indx] = 16;
2039         /* all other cases... */
2040         return (NULL);
2041 }
2042
2043
2044 /*
2045  * handle a state cookie for a new association m: input packet mbuf chain--
2046  * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
2047  * and the cookie signature does not exist offset: offset into mbuf to the
2048  * cookie-echo chunk length: length of the cookie chunk to: where the init
2049  * was from returns a new TCB
2050  */
2051 static struct sctp_tcb *
2052 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
2053     struct sockaddr *src, struct sockaddr *dst,
2054     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
2055     struct sctp_inpcb *inp, struct sctp_nets **netp,
2056     struct sockaddr *init_src, int *notification,
2057     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2058     uint8_t mflowtype, uint32_t mflowid,
2059     uint32_t vrf_id, uint16_t port)
2060 {
2061         struct sctp_tcb *stcb;
2062         struct sctp_init_chunk *init_cp, init_buf;
2063         struct sctp_init_ack_chunk *initack_cp, initack_buf;
2064         union sctp_sockstore store;
2065         struct sctp_association *asoc;
2066         int init_offset, initack_offset, initack_limit;
2067         int retval;
2068         int error = 0;
2069         uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
2070
2071 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2072         struct socket *so;
2073
2074         so = SCTP_INP_SO(inp);
2075 #endif
2076
2077         /*
2078          * find and validate the INIT chunk in the cookie (peer's info) the
2079          * INIT should start after the cookie-echo header struct (chunk
2080          * header, state cookie header struct)
2081          */
2082         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
2083         init_cp = (struct sctp_init_chunk *)
2084             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
2085             (uint8_t *) & init_buf);
2086         if (init_cp == NULL) {
2087                 /* could not pull a INIT chunk in cookie */
2088                 SCTPDBG(SCTP_DEBUG_INPUT1,
2089                     "process_cookie_new: could not pull INIT chunk hdr\n");
2090                 return (NULL);
2091         }
2092         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
2093                 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
2094                 return (NULL);
2095         }
2096         initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
2097         /*
2098          * find and validate the INIT-ACK chunk in the cookie (my info) the
2099          * INIT-ACK follows the INIT chunk
2100          */
2101         initack_cp = (struct sctp_init_ack_chunk *)
2102             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
2103             (uint8_t *) & initack_buf);
2104         if (initack_cp == NULL) {
2105                 /* could not pull INIT-ACK chunk in cookie */
2106                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
2107                 return (NULL);
2108         }
2109         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
2110                 return (NULL);
2111         }
2112         /*
2113          * NOTE: We can't use the INIT_ACK's chk_length to determine the
2114          * "initack_limit" value.  This is because the chk_length field
2115          * includes the length of the cookie, but the cookie is omitted when
2116          * the INIT and INIT_ACK are tacked onto the cookie...
2117          */
2118         initack_limit = offset + cookie_len;
2119
2120         /*
2121          * now that we know the INIT/INIT-ACK are in place, create a new TCB
2122          * and popluate
2123          */
2124
2125         /*
2126          * Here we do a trick, we set in NULL for the proc/thread argument.
2127          * We do this since in effect we only use the p argument when the
2128          * socket is unbound and we must do an implicit bind. Since we are
2129          * getting a cookie, we cannot be unbound.
2130          */
2131         stcb = sctp_aloc_assoc(inp, init_src, &error,
2132             ntohl(initack_cp->init.initiate_tag), vrf_id,
2133             ntohs(initack_cp->init.num_outbound_streams),
2134             (struct thread *)NULL
2135             );
2136         if (stcb == NULL) {
2137                 struct mbuf *op_err;
2138
2139                 /* memory problem? */
2140                 SCTPDBG(SCTP_DEBUG_INPUT1,
2141                     "process_cookie_new: no room for another TCB!\n");
2142                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2143                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2144                     src, dst, sh, op_err,
2145                     mflowtype, mflowid,
2146                     vrf_id, port);
2147                 return (NULL);
2148         }
2149         /* get the correct sctp_nets */
2150         if (netp)
2151                 *netp = sctp_findnet(stcb, init_src);
2152
2153         asoc = &stcb->asoc;
2154         /* get scope variables out of cookie */
2155         asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
2156         asoc->scope.site_scope = cookie->site_scope;
2157         asoc->scope.local_scope = cookie->local_scope;
2158         asoc->scope.loopback_scope = cookie->loopback_scope;
2159
2160         if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
2161             (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
2162                 struct mbuf *op_err;
2163
2164                 /*
2165                  * Houston we have a problem. The EP changed while the
2166                  * cookie was in flight. Only recourse is to abort the
2167                  * association.
2168                  */
2169                 atomic_add_int(&stcb->asoc.refcnt, 1);
2170                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2171                 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
2172                     src, dst, sh, op_err,
2173                     mflowtype, mflowid,
2174                     vrf_id, port);
2175 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2176                 SCTP_TCB_UNLOCK(stcb);
2177                 SCTP_SOCKET_LOCK(so, 1);
2178                 SCTP_TCB_LOCK(stcb);
2179 #endif
2180                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2181                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
2182 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2183                 SCTP_SOCKET_UNLOCK(so, 1);
2184 #endif
2185                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2186                 return (NULL);
2187         }
2188         /* process the INIT-ACK info (my info) */
2189         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
2190         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
2191         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
2192         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
2193         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
2194         asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
2195         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
2196         asoc->str_reset_seq_in = asoc->init_seq_number;
2197
2198         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
2199
2200         /* process the INIT info (peer's info) */
2201         if (netp)
2202                 retval = sctp_process_init(init_cp, stcb);
2203         else
2204                 retval = 0;
2205         if (retval < 0) {
2206                 atomic_add_int(&stcb->asoc.refcnt, 1);
2207 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2208                 SCTP_TCB_UNLOCK(stcb);
2209                 SCTP_SOCKET_LOCK(so, 1);
2210                 SCTP_TCB_LOCK(stcb);
2211 #endif
2212                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2213                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
2214 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2215                 SCTP_SOCKET_UNLOCK(so, 1);
2216 #endif
2217                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2218                 return (NULL);
2219         }
2220         /* load all addresses */
2221         if (sctp_load_addresses_from_init(stcb, m,
2222             init_offset + sizeof(struct sctp_init_chunk), initack_offset,
2223             src, dst, init_src)) {
2224                 atomic_add_int(&stcb->asoc.refcnt, 1);
2225 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2226                 SCTP_TCB_UNLOCK(stcb);
2227                 SCTP_SOCKET_LOCK(so, 1);
2228                 SCTP_TCB_LOCK(stcb);
2229 #endif
2230                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2231                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
2232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2233                 SCTP_SOCKET_UNLOCK(so, 1);
2234 #endif
2235                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2236                 return (NULL);
2237         }
2238         /*
2239          * verify any preceding AUTH chunk that was skipped
2240          */
2241         /* pull the local authentication parameters from the cookie/init-ack */
2242         sctp_auth_get_cookie_params(stcb, m,
2243             initack_offset + sizeof(struct sctp_init_ack_chunk),
2244             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
2245         if (auth_skipped) {
2246                 struct sctp_auth_chunk *auth;
2247
2248                 auth = (struct sctp_auth_chunk *)
2249                     sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
2250                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
2251                         /* auth HMAC failed, dump the assoc and packet */
2252                         SCTPDBG(SCTP_DEBUG_AUTH1,
2253                             "COOKIE-ECHO: AUTH failed\n");
2254                         atomic_add_int(&stcb->asoc.refcnt, 1);
2255 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2256                         SCTP_TCB_UNLOCK(stcb);
2257                         SCTP_SOCKET_LOCK(so, 1);
2258                         SCTP_TCB_LOCK(stcb);
2259 #endif
2260                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2261                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
2262 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2263                         SCTP_SOCKET_UNLOCK(so, 1);
2264 #endif
2265                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2266                         return (NULL);
2267                 } else {
2268                         /* remaining chunks checked... good to go */
2269                         stcb->asoc.authenticated = 1;
2270                 }
2271         }
2272         /* update current state */
2273         SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2274         SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2275         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2276                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2277                     stcb->sctp_ep, stcb, asoc->primary_destination);
2278         }
2279         sctp_stop_all_cookie_timers(stcb);
2280         SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
2281         SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2282
2283         /*
2284          * if we're doing ASCONFs, check to see if we have any new local
2285          * addresses that need to get added to the peer (eg. addresses
2286          * changed while cookie echo in flight).  This needs to be done
2287          * after we go to the OPEN state to do the correct asconf
2288          * processing. else, make sure we have the correct addresses in our
2289          * lists
2290          */
2291
2292         /* warning, we re-use sin, sin6, sa_store here! */
2293         /* pull in local_address (our "from" address) */
2294         switch (cookie->laddr_type) {
2295 #ifdef INET
2296         case SCTP_IPV4_ADDRESS:
2297                 /* source addr is IPv4 */
2298                 memset(&store.sin, 0, sizeof(struct sockaddr_in));
2299                 store.sin.sin_family = AF_INET;
2300                 store.sin.sin_len = sizeof(struct sockaddr_in);
2301                 store.sin.sin_addr.s_addr = cookie->laddress[0];
2302                 break;
2303 #endif
2304 #ifdef INET6
2305         case SCTP_IPV6_ADDRESS:
2306                 /* source addr is IPv6 */
2307                 memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
2308                 store.sin6.sin6_family = AF_INET6;
2309                 store.sin6.sin6_len = sizeof(struct sockaddr_in6);
2310                 store.sin6.sin6_scope_id = cookie->scope_id;
2311                 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
2312                 break;
2313 #endif
2314         default:
2315                 atomic_add_int(&stcb->asoc.refcnt, 1);
2316 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2317                 SCTP_TCB_UNLOCK(stcb);
2318                 SCTP_SOCKET_LOCK(so, 1);
2319                 SCTP_TCB_LOCK(stcb);
2320 #endif
2321                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
2322                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
2323 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2324                 SCTP_SOCKET_UNLOCK(so, 1);
2325 #endif
2326                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2327                 return (NULL);
2328         }
2329
2330         /* set up to notify upper layer */
2331         *notification = SCTP_NOTIFY_ASSOC_UP;
2332         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2333             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
2334             (inp->sctp_socket->so_qlimit == 0)) {
2335                 /*
2336                  * This is an endpoint that called connect() how it got a
2337                  * cookie that is NEW is a bit of a mystery. It must be that
2338                  * the INIT was sent, but before it got there.. a complete
2339                  * INIT/INIT-ACK/COOKIE arrived. But of course then it
2340                  * should have went to the other code.. not here.. oh well..
2341                  * a bit of protection is worth having..
2342                  */
2343                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2344 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2345                 atomic_add_int(&stcb->asoc.refcnt, 1);
2346                 SCTP_TCB_UNLOCK(stcb);
2347                 SCTP_SOCKET_LOCK(so, 1);
2348                 SCTP_TCB_LOCK(stcb);
2349                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
2350                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2351                         SCTP_SOCKET_UNLOCK(so, 1);
2352                         return (NULL);
2353                 }
2354 #endif
2355                 soisconnected(stcb->sctp_socket);
2356 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2357                 SCTP_SOCKET_UNLOCK(so, 1);
2358 #endif
2359         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
2360             (inp->sctp_socket->so_qlimit)) {
2361                 /*
2362                  * We don't want to do anything with this one. Since it is
2363                  * the listening guy. The timer will get started for
2364                  * accepted connections in the caller.
2365                  */
2366                 ;
2367         }
2368         /* since we did not send a HB make sure we don't double things */
2369         if ((netp) && (*netp))
2370                 (*netp)->hb_responded = 1;
2371
2372         if (stcb->asoc.sctp_autoclose_ticks &&
2373             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2374                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
2375         }
2376         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
2377         if ((netp != NULL) && (*netp != NULL)) {
2378                 /* calculate the RTT and set the encaps port */
2379                 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
2380                     &cookie->time_entered, sctp_align_unsafe_makecopy,
2381                     SCTP_RTT_FROM_NON_DATA);
2382 #if defined(INET) || defined(INET6)
2383                 if (((*netp)->port == 0) && (port != 0)) {
2384                         sctp_pathmtu_adjustment(stcb, (uint16_t) ((*netp)->mtu - sizeof(struct udphdr)));
2385                 }
2386                 (*netp)->port = port;
2387 #endif
2388         }
2389         /* respond with a COOKIE-ACK */
2390         sctp_send_cookie_ack(stcb);
2391
2392         /*
2393          * check the address lists for any ASCONFs that need to be sent
2394          * AFTER the cookie-ack is sent
2395          */
2396         sctp_check_address_list(stcb, m,
2397             initack_offset + sizeof(struct sctp_init_ack_chunk),
2398             initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
2399             &store.sa, cookie->local_scope, cookie->site_scope,
2400             cookie->ipv4_scope, cookie->loopback_scope);
2401
2402
2403         return (stcb);
2404 }
2405
2406 /*
2407  * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
2408  * we NEED to make sure we are not already using the vtag. If so we
2409  * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
2410         head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
2411                                                             SCTP_BASE_INFO(hashasocmark))];
2412         LIST_FOREACH(stcb, head, sctp_asocs) {
2413                 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep))  {
2414                        -- SEND ABORT - TRY AGAIN --
2415                 }
2416         }
2417 */
2418
2419 /*
2420  * handles a COOKIE-ECHO message stcb: modified to either a new or left as
2421  * existing (non-NULL) TCB
2422  */
2423 static struct mbuf *
2424 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
2425     struct sockaddr *src, struct sockaddr *dst,
2426     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
2427     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
2428     int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
2429     struct sctp_tcb **locked_tcb,
2430     uint8_t mflowtype, uint32_t mflowid,
2431     uint32_t vrf_id, uint16_t port)
2432 {
2433         struct sctp_state_cookie *cookie;
2434         struct sctp_tcb *l_stcb = *stcb;
2435         struct sctp_inpcb *l_inp;
2436         struct sockaddr *to;
2437         struct sctp_pcb *ep;
2438         struct mbuf *m_sig;
2439         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
2440         uint8_t *sig;
2441         uint8_t cookie_ok = 0;
2442         unsigned int sig_offset, cookie_offset;
2443         unsigned int cookie_len;
2444         struct timeval now;
2445         struct timeval time_expires;
2446         int notification = 0;
2447         struct sctp_nets *netl;
2448         int had_a_existing_tcb = 0;
2449         int send_int_conf = 0;
2450
2451 #ifdef INET
2452         struct sockaddr_in sin;
2453
2454 #endif
2455 #ifdef INET6
2456         struct sockaddr_in6 sin6;
2457
2458 #endif
2459
2460         SCTPDBG(SCTP_DEBUG_INPUT2,
2461             "sctp_handle_cookie: handling COOKIE-ECHO\n");
2462
2463         if (inp_p == NULL) {
2464                 return (NULL);
2465         }
2466         cookie = &cp->cookie;
2467         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
2468         cookie_len = ntohs(cp->ch.chunk_length);
2469
2470         if ((cookie->peerport != sh->src_port) ||
2471             (cookie->myport != sh->dest_port) ||
2472             (cookie->my_vtag != sh->v_tag)) {
2473                 /*
2474                  * invalid ports or bad tag.  Note that we always leave the
2475                  * v_tag in the header in network order and when we stored
2476                  * it in the my_vtag slot we also left it in network order.
2477                  * This maintains the match even though it may be in the
2478                  * opposite byte order of the machine :->
2479                  */
2480                 return (NULL);
2481         }
2482         if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
2483             sizeof(struct sctp_init_chunk) +
2484             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
2485                 /* cookie too small */
2486                 return (NULL);
2487         }
2488         /*
2489          * split off the signature into its own mbuf (since it should not be
2490          * calculated in the sctp_hmac_m() call).
2491          */
2492         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
2493         m_sig = m_split(m, sig_offset, M_NOWAIT);
2494         if (m_sig == NULL) {
2495                 /* out of memory or ?? */
2496                 return (NULL);
2497         }
2498 #ifdef SCTP_MBUF_LOGGING
2499         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
2500                 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
2501         }
2502 #endif
2503
2504         /*
2505          * compute the signature/digest for the cookie
2506          */
2507         ep = &(*inp_p)->sctp_ep;
2508         l_inp = *inp_p;
2509         if (l_stcb) {
2510                 SCTP_TCB_UNLOCK(l_stcb);
2511         }
2512         SCTP_INP_RLOCK(l_inp);
2513         if (l_stcb) {
2514                 SCTP_TCB_LOCK(l_stcb);
2515         }
2516         /* which cookie is it? */
2517         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
2518             (ep->current_secret_number != ep->last_secret_number)) {
2519                 /* it's the old cookie */
2520                 (void)sctp_hmac_m(SCTP_HMAC,
2521                     (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2522                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2523         } else {
2524                 /* it's the current cookie */
2525                 (void)sctp_hmac_m(SCTP_HMAC,
2526                     (uint8_t *) ep->secret_key[(int)ep->current_secret_number],
2527                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2528         }
2529         /* get the signature */
2530         SCTP_INP_RUNLOCK(l_inp);
2531         sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
2532         if (sig == NULL) {
2533                 /* couldn't find signature */
2534                 sctp_m_freem(m_sig);
2535                 return (NULL);
2536         }
2537         /* compare the received digest with the computed digest */
2538         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
2539                 /* try the old cookie? */
2540                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
2541                     (ep->current_secret_number != ep->last_secret_number)) {
2542                         /* compute digest with old */
2543                         (void)sctp_hmac_m(SCTP_HMAC,
2544                             (uint8_t *) ep->secret_key[(int)ep->last_secret_number],
2545                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
2546                         /* compare */
2547                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
2548                                 cookie_ok = 1;
2549                 }
2550         } else {
2551                 cookie_ok = 1;
2552         }
2553
2554         /*
2555          * Now before we continue we must reconstruct our mbuf so that
2556          * normal processing of any other chunks will work.
2557          */
2558         {
2559                 struct mbuf *m_at;
2560
2561                 m_at = m;
2562                 while (SCTP_BUF_NEXT(m_at) != NULL) {
2563                         m_at = SCTP_BUF_NEXT(m_at);
2564                 }
2565                 SCTP_BUF_NEXT(m_at) = m_sig;
2566         }
2567
2568         if (cookie_ok == 0) {
2569                 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
2570                 SCTPDBG(SCTP_DEBUG_INPUT2,
2571                     "offset = %u, cookie_offset = %u, sig_offset = %u\n",
2572                     (uint32_t) offset, cookie_offset, sig_offset);
2573                 return (NULL);
2574         }
2575         /*
2576          * check the cookie timestamps to be sure it's not stale
2577          */
2578         (void)SCTP_GETTIME_TIMEVAL(&now);
2579         /* Expire time is in Ticks, so we convert to seconds */
2580         time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
2581         time_expires.tv_usec = cookie->time_entered.tv_usec;
2582         /*
2583          * TODO sctp_constants.h needs alternative time macros when _KERNEL
2584          * is undefined.
2585          */
2586         if (timevalcmp(&now, &time_expires, >)) {
2587                 /* cookie is stale! */
2588                 struct mbuf *op_err;
2589                 struct sctp_error_stale_cookie *cause;
2590                 uint32_t tim;
2591
2592                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
2593                     0, M_NOWAIT, 1, MT_DATA);
2594                 if (op_err == NULL) {
2595                         /* FOOBAR */
2596                         return (NULL);
2597                 }
2598                 /* Set the len */
2599                 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
2600                 cause = mtod(op_err, struct sctp_error_stale_cookie *);
2601                 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
2602                 cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
2603                     (sizeof(uint32_t))));
2604                 /* seconds to usec */
2605                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
2606                 /* add in usec */
2607                 if (tim == 0)
2608                         tim = now.tv_usec - cookie->time_entered.tv_usec;
2609                 cause->stale_time = htonl(tim);
2610                 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
2611                     mflowtype, mflowid, l_inp->fibnum,
2612                     vrf_id, port);
2613                 return (NULL);
2614         }
2615         /*
2616          * Now we must see with the lookup address if we have an existing
2617          * asoc. This will only happen if we were in the COOKIE-WAIT state
2618          * and a INIT collided with us and somewhere the peer sent the
2619          * cookie on another address besides the single address our assoc
2620          * had for him. In this case we will have one of the tie-tags set at
2621          * least AND the address field in the cookie can be used to look it
2622          * up.
2623          */
2624         to = NULL;
2625         switch (cookie->addr_type) {
2626 #ifdef INET6
2627         case SCTP_IPV6_ADDRESS:
2628                 memset(&sin6, 0, sizeof(sin6));
2629                 sin6.sin6_family = AF_INET6;
2630                 sin6.sin6_len = sizeof(sin6);
2631                 sin6.sin6_port = sh->src_port;
2632                 sin6.sin6_scope_id = cookie->scope_id;
2633                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2634                     sizeof(sin6.sin6_addr.s6_addr));
2635                 to = (struct sockaddr *)&sin6;
2636                 break;
2637 #endif
2638 #ifdef INET
2639         case SCTP_IPV4_ADDRESS:
2640                 memset(&sin, 0, sizeof(sin));
2641                 sin.sin_family = AF_INET;
2642                 sin.sin_len = sizeof(sin);
2643                 sin.sin_port = sh->src_port;
2644                 sin.sin_addr.s_addr = cookie->address[0];
2645                 to = (struct sockaddr *)&sin;
2646                 break;
2647 #endif
2648         default:
2649                 /* This should not happen */
2650                 return (NULL);
2651         }
2652         if (*stcb == NULL) {
2653                 /* Yep, lets check */
2654                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
2655                 if (*stcb == NULL) {
2656                         /*
2657                          * We should have only got back the same inp. If we
2658                          * got back a different ep we have a problem. The
2659                          * original findep got back l_inp and now
2660                          */
2661                         if (l_inp != *inp_p) {
2662                                 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
2663                         }
2664                 } else {
2665                         if (*locked_tcb == NULL) {
2666                                 /*
2667                                  * In this case we found the assoc only
2668                                  * after we locked the create lock. This
2669                                  * means we are in a colliding case and we
2670                                  * must make sure that we unlock the tcb if
2671                                  * its one of the cases where we throw away
2672                                  * the incoming packets.
2673                                  */
2674                                 *locked_tcb = *stcb;
2675
2676                                 /*
2677                                  * We must also increment the inp ref count
2678                                  * since the ref_count flags was set when we
2679                                  * did not find the TCB, now we found it
2680                                  * which reduces the refcount.. we must
2681                                  * raise it back out to balance it all :-)
2682                                  */
2683                                 SCTP_INP_INCR_REF((*stcb)->sctp_ep);
2684                                 if ((*stcb)->sctp_ep != l_inp) {
2685                                         SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
2686                                             (void *)(*stcb)->sctp_ep, (void *)l_inp);
2687                                 }
2688                         }
2689                 }
2690         }
2691         cookie_len -= SCTP_SIGNATURE_SIZE;
2692         if (*stcb == NULL) {
2693                 /* this is the "normal" case... get a new TCB */
2694                 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
2695                     cookie, cookie_len, *inp_p,
2696                     netp, to, &notification,
2697                     auth_skipped, auth_offset, auth_len,
2698                     mflowtype, mflowid,
2699                     vrf_id, port);
2700         } else {
2701                 /* this is abnormal... cookie-echo on existing TCB */
2702                 had_a_existing_tcb = 1;
2703                 *stcb = sctp_process_cookie_existing(m, iphlen, offset,
2704                     src, dst, sh,
2705                     cookie, cookie_len, *inp_p, *stcb, netp, to,
2706                     &notification, auth_skipped, auth_offset, auth_len,
2707                     mflowtype, mflowid,
2708                     vrf_id, port);
2709         }
2710
2711         if (*stcb == NULL) {
2712                 /* still no TCB... must be bad cookie-echo */
2713                 return (NULL);
2714         }
2715         if (*netp != NULL) {
2716                 (*netp)->flowtype = mflowtype;
2717                 (*netp)->flowid = mflowid;
2718         }
2719         /*
2720          * Ok, we built an association so confirm the address we sent the
2721          * INIT-ACK to.
2722          */
2723         netl = sctp_findnet(*stcb, to);
2724         /*
2725          * This code should in theory NOT run but
2726          */
2727         if (netl == NULL) {
2728                 /* TSNH! Huh, why do I need to add this address here? */
2729                 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
2730                         return (NULL);
2731                 }
2732                 netl = sctp_findnet(*stcb, to);
2733         }
2734         if (netl) {
2735                 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
2736                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2737                         (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
2738                             netl);
2739                         send_int_conf = 1;
2740                 }
2741         }
2742         sctp_start_net_timers(*stcb);
2743         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2744                 if (!had_a_existing_tcb ||
2745                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2746                         /*
2747                          * If we have a NEW cookie or the connect never
2748                          * reached the connected state during collision we
2749                          * must do the TCP accept thing.
2750                          */
2751                         struct socket *so, *oso;
2752                         struct sctp_inpcb *inp;
2753
2754                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2755                                 /*
2756                                  * For a restart we will keep the same
2757                                  * socket, no need to do anything. I THINK!!
2758                                  */
2759                                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2760                                 if (send_int_conf) {
2761                                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2762                                             (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2763                                 }
2764                                 return (m);
2765                         }
2766                         oso = (*inp_p)->sctp_socket;
2767                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2768                         SCTP_TCB_UNLOCK((*stcb));
2769                         CURVNET_SET(oso->so_vnet);
2770                         so = sonewconn(oso, 0
2771                             );
2772                         CURVNET_RESTORE();
2773                         SCTP_TCB_LOCK((*stcb));
2774                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2775
2776                         if (so == NULL) {
2777                                 struct mbuf *op_err;
2778
2779 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2780                                 struct socket *pcb_so;
2781
2782 #endif
2783                                 /* Too many sockets */
2784                                 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
2785                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
2786                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2787                                     src, dst, sh, op_err,
2788                                     mflowtype, mflowid,
2789                                     vrf_id, port);
2790 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2791                                 pcb_so = SCTP_INP_SO(*inp_p);
2792                                 atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2793                                 SCTP_TCB_UNLOCK((*stcb));
2794                                 SCTP_SOCKET_LOCK(pcb_so, 1);
2795                                 SCTP_TCB_LOCK((*stcb));
2796                                 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2797 #endif
2798                                 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
2799                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
2800 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2801                                 SCTP_SOCKET_UNLOCK(pcb_so, 1);
2802 #endif
2803                                 return (NULL);
2804                         }
2805                         inp = (struct sctp_inpcb *)so->so_pcb;
2806                         SCTP_INP_INCR_REF(inp);
2807                         /*
2808                          * We add the unbound flag here so that if we get an
2809                          * soabort() before we get the move_pcb done, we
2810                          * will properly cleanup.
2811                          */
2812                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2813                             SCTP_PCB_FLAGS_CONNECTED |
2814                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2815                             SCTP_PCB_FLAGS_UNBOUND |
2816                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2817                             SCTP_PCB_FLAGS_DONT_WAKE);
2818                         inp->sctp_features = (*inp_p)->sctp_features;
2819                         inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
2820                         inp->sctp_socket = so;
2821                         inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
2822                         inp->max_cwnd = (*inp_p)->max_cwnd;
2823                         inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
2824                         inp->ecn_supported = (*inp_p)->ecn_supported;
2825                         inp->prsctp_supported = (*inp_p)->prsctp_supported;
2826                         inp->auth_supported = (*inp_p)->auth_supported;
2827                         inp->asconf_supported = (*inp_p)->asconf_supported;
2828                         inp->reconfig_supported = (*inp_p)->reconfig_supported;
2829                         inp->nrsack_supported = (*inp_p)->nrsack_supported;
2830                         inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
2831                         inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
2832                         inp->sctp_context = (*inp_p)->sctp_context;
2833                         inp->local_strreset_support = (*inp_p)->local_strreset_support;
2834                         inp->fibnum = (*inp_p)->fibnum;
2835                         inp->inp_starting_point_for_iterator = NULL;
2836                         /*
2837                          * copy in the authentication parameters from the
2838                          * original endpoint
2839                          */
2840                         if (inp->sctp_ep.local_hmacs)
2841                                 sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
2842                         inp->sctp_ep.local_hmacs =
2843                             sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
2844                         if (inp->sctp_ep.local_auth_chunks)
2845                                 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
2846                         inp->sctp_ep.local_auth_chunks =
2847                             sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
2848
2849                         /*
2850                          * Now we must move it from one hash table to
2851                          * another and get the tcb in the right place.
2852                          */
2853
2854                         /*
2855                          * This is where the one-2-one socket is put into
2856                          * the accept state waiting for the accept!
2857                          */
2858                         if (*stcb) {
2859                                 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
2860                         }
2861                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2862
2863                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2864                         SCTP_TCB_UNLOCK((*stcb));
2865
2866                         sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
2867                             0);
2868                         SCTP_TCB_LOCK((*stcb));
2869                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2870
2871
2872                         /*
2873                          * now we must check to see if we were aborted while
2874                          * the move was going on and the lock/unlock
2875                          * happened.
2876                          */
2877                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
2878                                 /*
2879                                  * yep it was, we leave the assoc attached
2880                                  * to the socket since the sctp_inpcb_free()
2881                                  * call will send an abort for us.
2882                                  */
2883                                 SCTP_INP_DECR_REF(inp);
2884                                 return (NULL);
2885                         }
2886                         SCTP_INP_DECR_REF(inp);
2887                         /* Switch over to the new guy */
2888                         *inp_p = inp;
2889                         sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2890                         if (send_int_conf) {
2891                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2892                                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2893                         }
2894                         /*
2895                          * Pull it from the incomplete queue and wake the
2896                          * guy
2897                          */
2898 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2899                         atomic_add_int(&(*stcb)->asoc.refcnt, 1);
2900                         SCTP_TCB_UNLOCK((*stcb));
2901                         SCTP_SOCKET_LOCK(so, 1);
2902 #endif
2903                         soisconnected(so);
2904 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2905                         SCTP_TCB_LOCK((*stcb));
2906                         atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
2907                         SCTP_SOCKET_UNLOCK(so, 1);
2908 #endif
2909                         return (m);
2910                 }
2911         }
2912         if (notification) {
2913                 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2914         }
2915         if (send_int_conf) {
2916                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2917                     (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
2918         }
2919         return (m);
2920 }
2921
2922 static void
2923 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
2924     struct sctp_tcb *stcb, struct sctp_nets *net)
2925 {
2926         /* cp must not be used, others call this without a c-ack :-) */
2927         struct sctp_association *asoc;
2928
2929         SCTPDBG(SCTP_DEBUG_INPUT2,
2930             "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2931         if ((stcb == NULL) || (net == NULL)) {
2932                 return;
2933         }
2934         asoc = &stcb->asoc;
2935
2936         sctp_stop_all_cookie_timers(stcb);
2937         /* process according to association state */
2938         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2939                 /* state change only needed when I am in right state */
2940                 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
2941                 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
2942                 sctp_start_net_timers(stcb);
2943                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2944                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
2945                             stcb->sctp_ep, stcb, asoc->primary_destination);
2946
2947                 }
2948                 /* update RTO */
2949                 SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
2950                 SCTP_STAT_INCR_GAUGE32(sctps_currestab);
2951                 if (asoc->overall_error_count == 0) {
2952                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2953                             &asoc->time_entered, sctp_align_safe_nocopy,
2954                             SCTP_RTT_FROM_NON_DATA);
2955                 }
2956                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2957                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
2958                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2959                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2960 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2961                         struct socket *so;
2962
2963 #endif
2964                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2965 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2966                         so = SCTP_INP_SO(stcb->sctp_ep);
2967                         atomic_add_int(&stcb->asoc.refcnt, 1);
2968                         SCTP_TCB_UNLOCK(stcb);
2969                         SCTP_SOCKET_LOCK(so, 1);
2970                         SCTP_TCB_LOCK(stcb);
2971                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
2972 #endif
2973                         if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
2974                                 soisconnected(stcb->sctp_socket);
2975                         }
2976 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
2977                         SCTP_SOCKET_UNLOCK(so, 1);
2978 #endif
2979                 }
2980                 /*
2981                  * since we did not send a HB make sure we don't double
2982                  * things
2983                  */
2984                 net->hb_responded = 1;
2985
2986                 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
2987                         /*
2988                          * We don't need to do the asconf thing, nor hb or
2989                          * autoclose if the socket is closed.
2990                          */
2991                         goto closed_socket;
2992                 }
2993                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2994                     stcb, net);
2995
2996
2997                 if (stcb->asoc.sctp_autoclose_ticks &&
2998                     sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
2999                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
3000                             stcb->sctp_ep, stcb, NULL);
3001                 }
3002                 /*
3003                  * send ASCONF if parameters are pending and ASCONFs are
3004                  * allowed (eg. addresses changed when init/cookie echo were
3005                  * in flight)
3006                  */
3007                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
3008                     (stcb->asoc.asconf_supported == 1) &&
3009                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
3010 #ifdef SCTP_TIMER_BASED_ASCONF
3011                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
3012                             stcb->sctp_ep, stcb,
3013                             stcb->asoc.primary_destination);
3014 #else
3015                         sctp_send_asconf(stcb, stcb->asoc.primary_destination,
3016                             SCTP_ADDR_NOT_LOCKED);
3017 #endif
3018                 }
3019         }
3020 closed_socket:
3021         /* Toss the cookie if I can */
3022         sctp_toss_old_cookies(stcb, asoc);
3023         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
3024                 /* Restart the timer if we have pending data */
3025                 struct sctp_tmit_chunk *chk;
3026
3027                 chk = TAILQ_FIRST(&asoc->sent_queue);
3028                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
3029         }
3030 }
3031
3032 static void
3033 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
3034     struct sctp_tcb *stcb)
3035 {
3036         struct sctp_nets *net;
3037         struct sctp_tmit_chunk *lchk;
3038         struct sctp_ecne_chunk bkup;
3039         uint8_t override_bit;
3040         uint32_t tsn, window_data_tsn;
3041         int len;
3042         unsigned int pkt_cnt;
3043
3044         len = ntohs(cp->ch.chunk_length);
3045         if ((len != sizeof(struct sctp_ecne_chunk)) &&
3046             (len != sizeof(struct old_sctp_ecne_chunk))) {
3047                 return;
3048         }
3049         if (len == sizeof(struct old_sctp_ecne_chunk)) {
3050                 /* Its the old format */
3051                 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
3052                 bkup.num_pkts_since_cwr = htonl(1);
3053                 cp = &bkup;
3054         }
3055         SCTP_STAT_INCR(sctps_recvecne);
3056         tsn = ntohl(cp->tsn);
3057         pkt_cnt = ntohl(cp->num_pkts_since_cwr);
3058         lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
3059         if (lchk == NULL) {
3060                 window_data_tsn = stcb->asoc.sending_seq - 1;
3061         } else {
3062                 window_data_tsn = lchk->rec.data.TSN_seq;
3063         }
3064
3065         /* Find where it was sent to if possible. */
3066         net = NULL;
3067         TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
3068                 if (lchk->rec.data.TSN_seq == tsn) {
3069                         net = lchk->whoTo;
3070                         net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
3071                         break;
3072                 }
3073                 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) {
3074                         break;
3075                 }
3076         }
3077         if (net == NULL) {
3078                 /*
3079                  * What to do. A previous send of a CWR was possibly lost.
3080                  * See how old it is, we may have it marked on the actual
3081                  * net.
3082                  */
3083                 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
3084                         if (tsn == net->last_cwr_tsn) {
3085                                 /* Found him, send it off */
3086                                 break;
3087                         }
3088                 }
3089                 if (net == NULL) {
3090                         /*
3091                          * If we reach here, we need to send a special CWR
3092                          * that says hey, we did this a long time ago and
3093                          * you lost the response.
3094                          */
3095                         net = TAILQ_FIRST(&stcb->asoc.nets);
3096                         if (net == NULL) {
3097                                 /* TSNH */
3098                                 return;
3099                         }
3100                         override_bit = SCTP_CWR_REDUCE_OVERRIDE;
3101                 } else {
3102                         override_bit = 0;
3103                 }
3104         } else {
3105                 override_bit = 0;
3106         }
3107         if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
3108             ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3109                 /*
3110                  * JRS - Use the congestion control given in the pluggable
3111                  * CC module
3112                  */
3113                 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
3114                 /*
3115                  * We reduce once every RTT. So we will only lower cwnd at
3116                  * the next sending seq i.e. the window_data_tsn
3117                  */
3118                 net->cwr_window_tsn = window_data_tsn;
3119                 net->ecn_ce_pkt_cnt += pkt_cnt;
3120                 net->lost_cnt = pkt_cnt;
3121                 net->last_cwr_tsn = tsn;
3122         } else {
3123                 override_bit |= SCTP_CWR_IN_SAME_WINDOW;
3124                 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
3125                     ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
3126                         /*
3127                          * Another loss in the same window update how many
3128                          * marks/packets lost we have had.
3129                          */
3130                         int cnt = 1;
3131
3132                         if (pkt_cnt > net->lost_cnt) {
3133                                 /* Should be the case */
3134                                 cnt = (pkt_cnt - net->lost_cnt);
3135                                 net->ecn_ce_pkt_cnt += cnt;
3136                         }
3137                         net->lost_cnt = pkt_cnt;
3138                         net->last_cwr_tsn = tsn;
3139                         /*
3140                          * Most CC functions will ignore this call, since we
3141                          * are in-window yet of the initial CE the peer saw.
3142                          */
3143                         stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
3144                 }
3145         }
3146         /*
3147          * We always send a CWR this way if our previous one was lost our
3148          * peer will get an update, or if it is not time again to reduce we
3149          * still get the cwr to the peer. Note we set the override when we
3150          * could not find the TSN on the chunk or the destination network.
3151          */
3152         sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
3153 }
3154
3155 static void
3156 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
3157 {
3158         /*
3159          * Here we get a CWR from the peer. We must look in the outqueue and
3160          * make sure that we have a covered ECNE in the control chunk part.
3161          * If so remove it.
3162          */
3163         struct sctp_tmit_chunk *chk;
3164         struct sctp_ecne_chunk *ecne;
3165         int override;
3166         uint32_t cwr_tsn;
3167
3168         cwr_tsn = ntohl(cp->tsn);
3169         override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
3170         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
3171                 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
3172                         continue;
3173                 }
3174                 if ((override == 0) && (chk->whoTo != net)) {
3175                         /* Must be from the right src unless override is set */
3176                         continue;
3177                 }
3178                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
3179                 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
3180                         /* this covers this ECNE, we can remove it */
3181                         stcb->asoc.ecn_echo_cnt_onq--;
3182                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
3183                             sctp_next);
3184                         sctp_m_freem(chk->data);
3185                         chk->data = NULL;
3186                         stcb->asoc.ctrl_queue_cnt--;
3187                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3188                         if (override == 0) {
3189                                 break;
3190                         }
3191                 }
3192         }
3193 }
3194
3195 static void
3196 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
3197     struct sctp_tcb *stcb, struct sctp_nets *net)
3198 {
3199         struct sctp_association *asoc;
3200
3201 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3202         struct socket *so;
3203
3204 #endif
3205
3206         SCTPDBG(SCTP_DEBUG_INPUT2,
3207             "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
3208         if (stcb == NULL)
3209                 return;
3210
3211         asoc = &stcb->asoc;
3212         /* process according to association state */
3213         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
3214                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
3215                 SCTPDBG(SCTP_DEBUG_INPUT2,
3216                     "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
3217                 SCTP_TCB_UNLOCK(stcb);
3218                 return;
3219         }
3220         /* notify upper layer protocol */
3221         if (stcb->sctp_socket) {
3222                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
3223         }
3224 #ifdef INVARIANTS
3225         if (!TAILQ_EMPTY(&asoc->send_queue) ||
3226             !TAILQ_EMPTY(&asoc->sent_queue) ||
3227             !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
3228                 panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
3229         }
3230 #endif
3231         /* stop the timer */
3232         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
3233             SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
3234         SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
3235         /* free the TCB */
3236         SCTPDBG(SCTP_DEBUG_INPUT2,
3237             "sctp_handle_shutdown_complete: calls free-asoc\n");
3238 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3239         so = SCTP_INP_SO(stcb->sctp_ep);
3240         atomic_add_int(&stcb->asoc.refcnt, 1);
3241         SCTP_TCB_UNLOCK(stcb);
3242         SCTP_SOCKET_LOCK(so, 1);
3243         SCTP_TCB_LOCK(stcb);
3244         atomic_subtract_int(&stcb->asoc.refcnt, 1);
3245 #endif
3246         (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
3247             SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
3248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
3249         SCTP_SOCKET_UNLOCK(so, 1);
3250 #endif
3251         return;
3252 }
3253
3254 static int
3255 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
3256     struct sctp_nets *net, uint8_t flg)
3257 {
3258         switch (desc->chunk_type) {
3259         case SCTP_DATA:
3260                 /* find the tsn to resend (possibly */
3261                 {
3262                         uint32_t tsn;
3263                         struct sctp_tmit_chunk *tp1;
3264
3265                         tsn = ntohl(desc->tsn_ifany);
3266                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3267                                 if (tp1->rec.data.TSN_seq == tsn) {
3268                                         /* found it */
3269                                         break;
3270                                 }
3271                                 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) {
3272                                         /* not found */
3273                                         tp1 = NULL;
3274                                         break;
3275                                 }
3276                         }
3277                         if (tp1 == NULL) {
3278                                 /*
3279                                  * Do it the other way , aka without paying
3280                                  * attention to queue seq order.
3281                                  */
3282                                 SCTP_STAT_INCR(sctps_pdrpdnfnd);
3283                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3284                                         if (tp1->rec.data.TSN_seq == tsn) {
3285                                                 /* found it */
3286                                                 break;
3287                                         }
3288                                 }
3289                         }
3290                         if (tp1 == NULL) {
3291                                 SCTP_STAT_INCR(sctps_pdrptsnnf);
3292                         }
3293                         if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
3294                                 uint8_t *ddp;
3295
3296                                 if (((flg & SCTP_BADCRC) == 0) &&
3297                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3298                                         return (0);
3299                                 }
3300                                 if ((stcb->asoc.peers_rwnd == 0) &&
3301                                     ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
3302                                         SCTP_STAT_INCR(sctps_pdrpdiwnp);
3303                                         return (0);
3304                                 }
3305                                 if (stcb->asoc.peers_rwnd == 0 &&
3306                                     (flg & SCTP_FROM_MIDDLE_BOX)) {
3307                                         SCTP_STAT_INCR(sctps_pdrpdizrw);
3308                                         return (0);
3309                                 }
3310                                 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+
3311                                     sizeof(struct sctp_data_chunk));
3312                                 {
3313                                         unsigned int iii;
3314
3315                                         for (iii = 0; iii < sizeof(desc->data_bytes);
3316                                             iii++) {
3317                                                 if (ddp[iii] != desc->data_bytes[iii]) {
3318                                                         SCTP_STAT_INCR(sctps_pdrpbadd);
3319                                                         return (-1);
3320                                                 }
3321                                         }
3322                                 }
3323
3324                                 if (tp1->do_rtt) {
3325                                         /*
3326                                          * this guy had a RTO calculation
3327                                          * pending on it, cancel it
3328                                          */
3329                                         if (tp1->whoTo->rto_needed == 0) {
3330                                                 tp1->whoTo->rto_needed = 1;
3331                                         }
3332                                         tp1->do_rtt = 0;
3333                                 }
3334                                 SCTP_STAT_INCR(sctps_pdrpmark);
3335                                 if (tp1->sent != SCTP_DATAGRAM_RESEND)
3336                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3337                                 /*
3338                                  * mark it as if we were doing a FR, since
3339                                  * we will be getting gap ack reports behind
3340                                  * the info from the router.
3341                                  */
3342                                 tp1->rec.data.doing_fast_retransmit = 1;
3343                                 /*
3344                                  * mark the tsn with what sequences can
3345                                  * cause a new FR.
3346                                  */
3347                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
3348                                         tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
3349                                 } else {
3350                                         tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
3351                                 }
3352
3353                                 /* restart the timer */
3354                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3355                                     stcb, tp1->whoTo,
3356                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
3357                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
3358                                     stcb, tp1->whoTo);
3359
3360                                 /* fix counts and things */
3361                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
3362                                         sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
3363                                             tp1->whoTo->flight_size,
3364                                             tp1->book_size,
3365                                             (uint32_t) (uintptr_t) stcb,
3366                                             tp1->rec.data.TSN_seq);
3367                                 }
3368                                 if (tp1->sent < SCTP_DATAGRAM_RESEND) {
3369                                         sctp_flight_size_decrease(tp1);
3370                                         sctp_total_flight_decrease(stcb, tp1);
3371                                 }
3372                                 tp1->sent = SCTP_DATAGRAM_RESEND;
3373                         } {
3374                                 /* audit code */
3375                                 unsigned int audit;
3376
3377                                 audit = 0;
3378                                 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
3379                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3380                                                 audit++;
3381                                 }
3382                                 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
3383                                     sctp_next) {
3384                                         if (tp1->sent == SCTP_DATAGRAM_RESEND)
3385                                                 audit++;
3386                                 }
3387                                 if (audit != stcb->asoc.sent_queue_retran_cnt) {
3388                                         SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
3389                                             audit, stcb->asoc.sent_queue_retran_cnt);
3390 #ifndef SCTP_AUDITING_ENABLED
3391                                         stcb->asoc.sent_queue_retran_cnt = audit;
3392 #endif
3393                                 }
3394                         }
3395                 }
3396                 break;
3397         case SCTP_ASCONF:
3398                 {
3399                         struct sctp_tmit_chunk *asconf;
3400
3401                         TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
3402                             sctp_next) {
3403                                 if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
3404                                         break;
3405                                 }
3406                         }
3407                         if (asconf) {
3408                                 if (asconf->sent != SCTP_DATAGRAM_RESEND)
3409                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3410                                 asconf->sent = SCTP_DATAGRAM_RESEND;
3411                                 asconf->snd_count--;
3412                         }
3413                 }
3414                 break;
3415         case SCTP_INITIATION:
3416                 /* resend the INIT */
3417                 stcb->asoc.dropped_special_cnt++;
3418                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
3419                         /*
3420                          * If we can get it in, in a few attempts we do
3421                          * this, otherwise we let the timer fire.
3422                          */
3423                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
3424                             stcb, net,
3425                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
3426                         sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
3427                 }
3428                 break;
3429         case SCTP_SELECTIVE_ACK:
3430         case SCTP_NR_SELECTIVE_ACK:
3431                 /* resend the sack */
3432                 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
3433                 break;
3434         case SCTP_HEARTBEAT_REQUEST:
3435                 /* resend a demand HB */
3436                 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
3437                         /*
3438                          * Only retransmit if we KNOW we wont destroy the
3439                          * tcb
3440                          */
3441                         sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
3442                 }
3443                 break;
3444         case SCTP_SHUTDOWN:
3445                 sctp_send_shutdown(stcb, net);
3446                 break;
3447         case SCTP_SHUTDOWN_ACK:
3448                 sctp_send_shutdown_ack(stcb, net);
3449                 break;
3450         case SCTP_COOKIE_ECHO:
3451                 {
3452                         struct sctp_tmit_chunk *cookie;
3453
3454                         cookie = NULL;
3455                         TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
3456                             sctp_next) {
3457                                 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
3458                                         break;
3459                                 }
3460                         }
3461                         if (cookie) {
3462                                 if (cookie->sent != SCTP_DATAGRAM_RESEND)
3463                                         sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
3464                                 cookie->sent = SCTP_DATAGRAM_RESEND;
3465                                 sctp_stop_all_cookie_timers(stcb);
3466                         }
3467                 }
3468                 break;
3469         case SCTP_COOKIE_ACK:
3470                 sctp_send_cookie_ack(stcb);
3471                 break;
3472         case SCTP_ASCONF_ACK:
3473                 /* resend last asconf ack */
3474                 sctp_send_asconf_ack(stcb);
3475                 break;
3476         case SCTP_IFORWARD_CUM_TSN:
3477         case SCTP_FORWARD_CUM_TSN:
3478                 send_forward_tsn(stcb, &stcb->asoc);
3479                 break;
3480                 /* can't do anything with these */
3481         case SCTP_PACKET_DROPPED:
3482         case SCTP_INITIATION_ACK:       /* this should not happen */
3483         case SCTP_HEARTBEAT_ACK:
3484         case SCTP_ABORT_ASSOCIATION:
3485         case SCTP_OPERATION_ERROR:
3486         case SCTP_SHUTDOWN_COMPLETE:
3487         case SCTP_ECN_ECHO:
3488         case SCTP_ECN_CWR:
3489         default:
3490                 break;
3491         }
3492         return (0);
3493 }
3494
3495 void
3496 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3497 {
3498         uint32_t i;
3499         uint16_t temp;
3500
3501         /*
3502          * We set things to 0xffffffff since this is the last delivered
3503          * sequence and we will be sending in 0 after the reset.
3504          */
3505
3506         if (number_entries) {
3507                 for (i = 0; i < number_entries; i++) {
3508                         temp = ntohs(list[i]);
3509                         if (temp >= stcb->asoc.streamincnt) {
3510                                 continue;
3511                         }
3512                         stcb->asoc.strmin[temp].last_sequence_delivered = 0xffffffff;
3513                 }
3514         } else {
3515                 list = NULL;
3516                 for (i = 0; i < stcb->asoc.streamincnt; i++) {
3517                         stcb->asoc.strmin[i].last_sequence_delivered = 0xffffffff;
3518                 }
3519         }
3520         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3521 }
3522
3523 static void
3524 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3525 {
3526         uint32_t i;
3527         uint16_t temp;
3528
3529         if (number_entries > 0) {
3530                 for (i = 0; i < number_entries; i++) {
3531                         temp = ntohs(list[i]);
3532                         if (temp >= stcb->asoc.streamoutcnt) {
3533                                 /* no such stream */
3534                                 continue;
3535                         }
3536                         stcb->asoc.strmout[temp].next_sequence_send = 0;
3537                 }
3538         } else {
3539                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3540                         stcb->asoc.strmout[i].next_sequence_send = 0;
3541                 }
3542         }
3543         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
3544 }
3545
3546 static void
3547 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list)
3548 {
3549         uint32_t i;
3550         uint16_t temp;
3551
3552         if (number_entries > 0) {
3553                 for (i = 0; i < number_entries; i++) {
3554                         temp = ntohs(list[i]);
3555                         if (temp >= stcb->asoc.streamoutcnt) {
3556                                 /* no such stream */
3557                                 continue;
3558                         }
3559                         stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
3560                 }
3561         } else {
3562                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3563                         stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
3564                 }
3565         }
3566 }
3567
3568
3569 struct sctp_stream_reset_request *
3570 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
3571 {
3572         struct sctp_association *asoc;
3573         struct sctp_chunkhdr *ch;
3574         struct sctp_stream_reset_request *r;
3575         struct sctp_tmit_chunk *chk;
3576         int len, clen;
3577
3578         asoc = &stcb->asoc;
3579         if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
3580                 asoc->stream_reset_outstanding = 0;
3581                 return (NULL);
3582         }
3583         if (stcb->asoc.str_reset == NULL) {
3584                 asoc->stream_reset_outstanding = 0;
3585                 return (NULL);
3586         }
3587         chk = stcb->asoc.str_reset;
3588         if (chk->data == NULL) {
3589                 return (NULL);
3590         }
3591         if (bchk) {
3592                 /* he wants a copy of the chk pointer */
3593                 *bchk = chk;
3594         }
3595         clen = chk->send_size;
3596         ch = mtod(chk->data, struct sctp_chunkhdr *);
3597         r = (struct sctp_stream_reset_request *)(ch + 1);
3598         if (ntohl(r->request_seq) == seq) {
3599                 /* found it */
3600                 return (r);
3601         }
3602         len = SCTP_SIZE32(ntohs(r->ph.param_length));
3603         if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
3604                 /* move to the next one, there can only be a max of two */
3605                 r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
3606                 if (ntohl(r->request_seq) == seq) {
3607                         return (r);
3608                 }
3609         }
3610         /* that seq is not here */
3611         return (NULL);
3612 }
3613
3614 static void
3615 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
3616 {
3617         struct sctp_association *asoc;
3618         struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
3619
3620         if (stcb->asoc.str_reset == NULL) {
3621                 return;
3622         }
3623         asoc = &stcb->asoc;
3624
3625         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
3626             chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
3627         TAILQ_REMOVE(&asoc->control_send_queue,
3628             chk,
3629             sctp_next);
3630         if (chk->data) {
3631                 sctp_m_freem(chk->data);
3632                 chk->data = NULL;
3633         }
3634         asoc->ctrl_queue_cnt--;
3635         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
3636         /* sa_ignore NO_NULL_CHK */
3637         stcb->asoc.str_reset = NULL;
3638 }
3639
3640
3641 static int
3642 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
3643     uint32_t seq, uint32_t action,
3644     struct sctp_stream_reset_response *respin)
3645 {
3646         uint16_t type;
3647         int lparm_len;
3648         struct sctp_association *asoc = &stcb->asoc;
3649         struct sctp_tmit_chunk *chk;
3650         struct sctp_stream_reset_request *req_param;
3651         struct sctp_stream_reset_out_request *req_out_param;
3652         struct sctp_stream_reset_in_request *req_in_param;
3653         uint32_t number_entries;
3654
3655         if (asoc->stream_reset_outstanding == 0) {
3656                 /* duplicate */
3657                 return (0);
3658         }
3659         if (seq == stcb->asoc.str_reset_seq_out) {
3660                 req_param = sctp_find_stream_reset(stcb, seq, &chk);
3661                 if (req_param != NULL) {
3662                         stcb->asoc.str_reset_seq_out++;
3663                         type = ntohs(req_param->ph.param_type);
3664                         lparm_len = ntohs(req_param->ph.param_length);
3665                         if (type == SCTP_STR_RESET_OUT_REQUEST) {
3666                                 int no_clear = 0;
3667
3668                                 req_out_param = (struct sctp_stream_reset_out_request *)req_param;
3669                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
3670                                 asoc->stream_reset_out_is_outstanding = 0;
3671                                 if (asoc->stream_reset_outstanding)
3672                                         asoc->stream_reset_outstanding--;
3673                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3674                                         /* do it */
3675                                         sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
3676                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3677                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3678                                 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
3679                                         /*
3680                                          * Set it up so we don't stop
3681                                          * retransmitting
3682                                          */
3683                                         asoc->stream_reset_outstanding++;
3684                                         stcb->asoc.str_reset_seq_out--;
3685                                         asoc->stream_reset_out_is_outstanding = 1;
3686                                         no_clear = 1;
3687                                 } else {
3688                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3689                                 }
3690                                 if (no_clear == 0) {
3691                                         sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
3692                                 }
3693                         } else if (type == SCTP_STR_RESET_IN_REQUEST) {
3694                                 req_in_param = (struct sctp_stream_reset_in_request *)req_param;
3695                                 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
3696                                 if (asoc->stream_reset_outstanding)
3697                                         asoc->stream_reset_outstanding--;
3698                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3699                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
3700                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3701                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3702                                         sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
3703                                             number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
3704                                 }
3705                         } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
3706                                 /* Ok we now may have more streams */
3707                                 int num_stream;
3708
3709                                 num_stream = stcb->asoc.strm_pending_add_size;
3710                                 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
3711                                         /* TSNH */
3712                                         num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
3713                                 }
3714                                 stcb->asoc.strm_pending_add_size = 0;
3715                                 if (asoc->stream_reset_outstanding)
3716                                         asoc->stream_reset_outstanding--;
3717                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3718                                         /* Put the new streams into effect */
3719                                         int i;
3720
3721                                         for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
3722                                                 asoc->strmout[i].state = SCTP_STREAM_OPEN;
3723                                         }
3724                                         asoc->streamoutcnt += num_stream;
3725                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
3726                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3727                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3728                                             SCTP_STREAM_CHANGE_DENIED);
3729                                 } else {
3730                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3731                                             SCTP_STREAM_CHANGE_FAILED);
3732                                 }
3733                         } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
3734                                 if (asoc->stream_reset_outstanding)
3735                                         asoc->stream_reset_outstanding--;
3736                                 if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3737                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3738                                             SCTP_STREAM_CHANGE_DENIED);
3739                                 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
3740                                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
3741                                             SCTP_STREAM_CHANGE_FAILED);
3742                                 }
3743                         } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
3744                                 /**
3745                                  * a) Adopt the new in tsn.
3746                                  * b) reset the map
3747                                  * c) Adopt the new out-tsn
3748                                  */
3749                                 struct sctp_stream_reset_response_tsn *resp;
3750                                 struct sctp_forward_tsn_chunk fwdtsn;
3751                                 int abort_flag = 0;
3752
3753                                 if (respin == NULL) {
3754                                         /* huh ? */
3755                                         return (0);
3756                                 }
3757                                 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
3758                                         return (0);
3759                                 }
3760                                 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
3761                                         resp = (struct sctp_stream_reset_response_tsn *)respin;
3762                                         asoc->stream_reset_outstanding--;
3763                                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3764                                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3765                                         fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
3766                                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3767                                         if (abort_flag) {
3768                                                 return (1);
3769                                         }
3770                                         stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
3771                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3772                                                 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3773                                         }
3774                                         stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
3775                                         stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
3776                                         memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
3777
3778                                         stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
3779                                         memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
3780
3781                                         stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
3782                                         stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
3783
3784                                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3785                                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3786                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
3787                                 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
3788                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3789                                             SCTP_ASSOC_RESET_DENIED);
3790                                 } else {
3791                                         sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
3792                                             SCTP_ASSOC_RESET_FAILED);
3793                                 }
3794                         }
3795                         /* get rid of the request and get the request flags */
3796                         if (asoc->stream_reset_outstanding == 0) {
3797                                 sctp_clean_up_stream_reset(stcb);
3798                         }
3799                 }
3800         }
3801         if (asoc->stream_reset_outstanding == 0) {
3802                 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3803         }
3804         return (0);
3805 }
3806
3807 static void
3808 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
3809     struct sctp_tmit_chunk *chk,
3810     struct sctp_stream_reset_in_request *req, int trunc)
3811 {
3812         uint32_t seq;
3813         int len, i;
3814         int number_entries;
3815         uint16_t temp;
3816
3817         /*
3818          * peer wants me to send a str-reset to him for my outgoing seq's if
3819          * seq_in is right.
3820          */
3821         struct sctp_association *asoc = &stcb->asoc;
3822
3823         seq = ntohl(req->request_seq);
3824         if (asoc->str_reset_seq_in == seq) {
3825                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3826                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3827                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3828                 } else if (trunc) {
3829                         /* Can't do it, since they exceeded our buffer size  */
3830                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3831                 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
3832                         len = ntohs(req->ph.param_length);
3833                         number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
3834                         if (number_entries) {
3835                                 for (i = 0; i < number_entries; i++) {
3836                                         temp = ntohs(req->list_of_streams[i]);
3837                                         if (temp >= stcb->asoc.streamoutcnt) {
3838                                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3839                                                 goto bad_boy;
3840                                         }
3841                                         req->list_of_streams[i] = temp;
3842                                 }
3843                                 for (i = 0; i < number_entries; i++) {
3844                                         if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
3845                                                 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
3846                                         }
3847                                 }
3848                         } else {
3849                                 /* Its all */
3850                                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
3851                                         if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
3852                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
3853                                 }
3854                         }
3855                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3856                 } else {
3857                         /* Can't do it, since we have sent one out */
3858                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
3859                 }
3860 bad_boy:
3861                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3862                 asoc->str_reset_seq_in++;
3863         } else if (asoc->str_reset_seq_in - 1 == seq) {
3864                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3865         } else if (asoc->str_reset_seq_in - 2 == seq) {
3866                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
3867         } else {
3868                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3869         }
3870         sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
3871 }
3872
3873 static int
3874 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
3875     struct sctp_tmit_chunk *chk,
3876     struct sctp_stream_reset_tsn_request *req)
3877 {
3878         /* reset all in and out and update the tsn */
3879         /*
3880          * A) reset my str-seq's on in and out. B) Select a receive next,
3881          * and set cum-ack to it. Also process this selected number as a
3882          * fwd-tsn as well. C) set in the response my next sending seq.
3883          */
3884         struct sctp_forward_tsn_chunk fwdtsn;
3885         struct sctp_association *asoc = &stcb->asoc;
3886         int abort_flag = 0;
3887         uint32_t seq;
3888
3889         seq = ntohl(req->request_seq);
3890         if (asoc->str_reset_seq_in == seq) {
3891                 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
3892                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
3893                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3894                 } else {
3895                         fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
3896                         fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
3897                         fwdtsn.ch.chunk_flags = 0;
3898                         fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
3899                         sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
3900                         if (abort_flag) {
3901                                 return (1);
3902                         }
3903                         asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
3904                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
3905                                 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
3906                         }
3907                         asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
3908                         asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
3909                         memset(asoc->mapping_array, 0, asoc->mapping_array_size);
3910                         asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
3911                         memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
3912                         atomic_add_int(&asoc->sending_seq, 1);
3913                         /* save off historical data for retrans */
3914                         asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
3915                         asoc->last_sending_seq[0] = asoc->sending_seq;
3916                         asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
3917                         asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
3918                         sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
3919                         sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
3920                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3921                         sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
3922                 }
3923                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3924                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3925                 asoc->str_reset_seq_in++;
3926         } else if (asoc->str_reset_seq_in - 1 == seq) {
3927                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
3928                     asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
3929         } else if (asoc->str_reset_seq_in - 2 == seq) {
3930                 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
3931                     asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
3932         } else {
3933                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
3934         }
3935         return (0);
3936 }
3937
3938 static void
3939 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
3940     struct sctp_tmit_chunk *chk,
3941     struct sctp_stream_reset_out_request *req, int trunc)
3942 {
3943         uint32_t seq, tsn;
3944         int number_entries, len;
3945         struct sctp_association *asoc = &stcb->asoc;
3946
3947         seq = ntohl(req->request_seq);
3948
3949         /* now if its not a duplicate we process it */
3950         if (asoc->str_reset_seq_in == seq) {
3951                 len = ntohs(req->ph.param_length);
3952                 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
3953                 /*
3954                  * the sender is resetting, handle the list issue.. we must
3955                  * a) verify if we can do the reset, if so no problem b) If
3956                  * we can't do the reset we must copy the request. c) queue
3957                  * it, and setup the data in processor to trigger it off
3958                  * when needed and dequeue all the queued data.
3959                  */
3960                 tsn = ntohl(req->send_reset_at_tsn);
3961
3962                 /* move the reset action back one */
3963                 asoc->last_reset_action[1] = asoc->last_reset_action[0];
3964                 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
3965                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3966                 } else if (trunc) {
3967                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3968                 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
3969                         /* we can do it now */
3970                         sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
3971                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
3972                 } else {
3973                         /*
3974                          * we must queue it up and thus wait for the TSN's
3975                          * to arrive that are at or before tsn
3976                          */
3977                         struct sctp_stream_reset_list *liste;
3978                         int siz;
3979
3980                         siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
3981                         SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
3982                             siz, SCTP_M_STRESET);
3983                         if (liste == NULL) {
3984                                 /* gak out of memory */
3985                                 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
3986                                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3987                                 return;
3988                         }
3989                         liste->seq = seq;
3990                         liste->tsn = tsn;
3991                         liste->number_entries = number_entries;
3992                         memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
3993                         TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
3994                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
3995                 }
3996                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
3997                 asoc->str_reset_seq_in++;
3998         } else if ((asoc->str_reset_seq_in - 1) == seq) {
3999                 /*
4000                  * one seq back, just echo back last action since my
4001                  * response was lost.
4002                  */
4003                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4004         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4005                 /*
4006                  * two seq back, just echo back last action since my
4007                  * response was lost.
4008                  */
4009                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4010         } else {
4011                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4012         }
4013 }
4014
4015 static void
4016 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4017     struct sctp_stream_reset_add_strm *str_add)
4018 {
4019         /*
4020          * Peer is requesting to add more streams. If its within our
4021          * max-streams we will allow it.
4022          */
4023         uint32_t num_stream, i;
4024         uint32_t seq;
4025         struct sctp_association *asoc = &stcb->asoc;
4026         struct sctp_queued_to_read *ctl, *nctl;
4027
4028         /* Get the number. */
4029         seq = ntohl(str_add->request_seq);
4030         num_stream = ntohs(str_add->number_of_streams);
4031         /* Now what would be the new total? */
4032         if (asoc->str_reset_seq_in == seq) {
4033                 num_stream += stcb->asoc.streamincnt;
4034                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4035                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4036                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4037                 } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
4038                     (num_stream > 0xffff)) {
4039                         /* We must reject it they ask for to many */
4040         denied:
4041                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4042                 } else {
4043                         /* Ok, we can do that :-) */
4044                         struct sctp_stream_in *oldstrm;
4045
4046                         /* save off the old */
4047                         oldstrm = stcb->asoc.strmin;
4048                         SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
4049                             (num_stream * sizeof(struct sctp_stream_in)),
4050                             SCTP_M_STRMI);
4051                         if (stcb->asoc.strmin == NULL) {
4052                                 stcb->asoc.strmin = oldstrm;
4053                                 goto denied;
4054                         }
4055                         /* copy off the old data */
4056                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
4057                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4058                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4059                                 stcb->asoc.strmin[i].stream_no = i;
4060                                 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered;
4061                                 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
4062                                 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
4063                                 /* now anything on those queues? */
4064                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
4065                                         TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
4066                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
4067                                 }
4068                                 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
4069                                         TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
4070                                         TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
4071                                 }
4072                         }
4073                         /* Init the new streams */
4074                         for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
4075                                 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
4076                                 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
4077                                 stcb->asoc.strmin[i].stream_no = i;
4078                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffffffff;
4079                                 stcb->asoc.strmin[i].pd_api_started = 0;
4080                                 stcb->asoc.strmin[i].delivery_started = 0;
4081                         }
4082                         SCTP_FREE(oldstrm, SCTP_M_STRMI);
4083                         /* update the size */
4084                         stcb->asoc.streamincnt = num_stream;
4085                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4086                         sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
4087                 }
4088                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4089                 asoc->str_reset_seq_in++;
4090         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4091                 /*
4092                  * one seq back, just echo back last action since my
4093                  * response was lost.
4094                  */
4095                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4096         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4097                 /*
4098                  * two seq back, just echo back last action since my
4099                  * response was lost.
4100                  */
4101                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4102         } else {
4103                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4104
4105         }
4106 }
4107
4108 static void
4109 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
4110     struct sctp_stream_reset_add_strm *str_add)
4111 {
4112         /*
4113          * Peer is requesting to add more streams. If its within our
4114          * max-streams we will allow it.
4115          */
4116         uint16_t num_stream;
4117         uint32_t seq;
4118         struct sctp_association *asoc = &stcb->asoc;
4119
4120         /* Get the number. */
4121         seq = ntohl(str_add->request_seq);
4122         num_stream = ntohs(str_add->number_of_streams);
4123         /* Now what would be the new total? */
4124         if (asoc->str_reset_seq_in == seq) {
4125                 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
4126                 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
4127                         asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4128                 } else if (stcb->asoc.stream_reset_outstanding) {
4129                         /* We must reject it we have something pending */
4130                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
4131                 } else {
4132                         /* Ok, we can do that :-) */
4133                         int mychk;
4134
4135                         mychk = stcb->asoc.streamoutcnt;
4136                         mychk += num_stream;
4137                         if (mychk < 0x10000) {
4138                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
4139                                 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
4140                                         stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4141                                 }
4142                         } else {
4143                                 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
4144                         }
4145                 }
4146                 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
4147                 asoc->str_reset_seq_in++;
4148         } else if ((asoc->str_reset_seq_in - 1) == seq) {
4149                 /*
4150                  * one seq back, just echo back last action since my
4151                  * response was lost.
4152                  */
4153                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
4154         } else if ((asoc->str_reset_seq_in - 2) == seq) {
4155                 /*
4156                  * two seq back, just echo back last action since my
4157                  * response was lost.
4158                  */
4159                 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
4160         } else {
4161                 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
4162         }
4163 }
4164
4165 #ifdef __GNUC__
4166 __attribute__((noinline))
4167 #endif
4168         static int
4169             sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
4170         struct sctp_chunkhdr *ch_req)
4171 {
4172         uint16_t remaining_length, param_len, ptype;
4173         struct sctp_paramhdr pstore;
4174         uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
4175         uint32_t seq = 0;
4176         int num_req = 0;
4177         int trunc = 0;
4178         struct sctp_tmit_chunk *chk;
4179         struct sctp_chunkhdr *ch;
4180         struct sctp_paramhdr *ph;
4181         int ret_code = 0;
4182         int num_param = 0;
4183
4184         /* now it may be a reset or a reset-response */
4185         remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
4186
4187         /* setup for adding the response */
4188         sctp_alloc_a_chunk(stcb, chk);
4189         if (chk == NULL) {
4190                 return (ret_code);
4191         }
4192         chk->copy_by_ref = 0;
4193         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
4194         chk->rec.chunk_id.can_take_data = 0;
4195         chk->flags = 0;
4196         chk->asoc = &stcb->asoc;
4197         chk->no_fr_allowed = 0;
4198         chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
4199         chk->book_size_scale = 0;
4200         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
4201         if (chk->data == NULL) {
4202 strres_nochunk:
4203                 if (chk->data) {
4204                         sctp_m_freem(chk->data);
4205                         chk->data = NULL;
4206                 }
4207                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
4208                 return (ret_code);
4209         }
4210         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
4211
4212         /* setup chunk parameters */
4213         chk->sent = SCTP_DATAGRAM_UNSENT;
4214         chk->snd_count = 0;
4215         chk->whoTo = NULL;
4216
4217         ch = mtod(chk->data, struct sctp_chunkhdr *);
4218         ch->chunk_type = SCTP_STREAM_RESET;
4219         ch->chunk_flags = 0;
4220         ch->chunk_length = htons(chk->send_size);
4221         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
4222         offset += sizeof(struct sctp_chunkhdr);
4223         while (remaining_length >= sizeof(struct sctp_paramhdr)) {
4224                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore);
4225                 if (ph == NULL) {
4226                         /* TSNH */
4227                         break;
4228                 }
4229                 param_len = ntohs(ph->param_length);
4230                 if ((param_len > remaining_length) ||
4231                     (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
4232                         /* bad parameter length */
4233                         break;
4234                 }
4235                 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
4236                     (uint8_t *) & cstore);
4237                 if (ph == NULL) {
4238                         /* TSNH */
4239                         break;
4240                 }
4241                 ptype = ntohs(ph->param_type);
4242                 num_param++;
4243                 if (param_len > sizeof(cstore)) {
4244                         trunc = 1;
4245                 } else {
4246                         trunc = 0;
4247                 }
4248                 if (num_param > SCTP_MAX_RESET_PARAMS) {
4249                         /* hit the max of parameters already sorry.. */
4250                         break;
4251                 }
4252                 if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
4253                         struct sctp_stream_reset_out_request *req_out;
4254
4255                         if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
4256                                 break;
4257                         }
4258                         req_out = (struct sctp_stream_reset_out_request *)ph;
4259                         num_req++;
4260                         if (stcb->asoc.stream_reset_outstanding) {
4261                                 seq = ntohl(req_out->response_seq);
4262                                 if (seq == stcb->asoc.str_reset_seq_out) {
4263                                         /* implicit ack */
4264                                         (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
4265                                 }
4266                         }
4267                         sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
4268                 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
4269                         struct sctp_stream_reset_add_strm *str_add;
4270
4271                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4272                                 break;
4273                         }
4274                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4275                         num_req++;
4276                         sctp_handle_str_reset_add_strm(stcb, chk, str_add);
4277                 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
4278                         struct sctp_stream_reset_add_strm *str_add;
4279
4280                         if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
4281                                 break;
4282                         }
4283                         str_add = (struct sctp_stream_reset_add_strm *)ph;
4284                         num_req++;
4285                         sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
4286                 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
4287                         struct sctp_stream_reset_in_request *req_in;
4288
4289                         num_req++;
4290                         req_in = (struct sctp_stream_reset_in_request *)ph;
4291                         sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
4292                 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
4293                         struct sctp_stream_reset_tsn_request *req_tsn;
4294
4295                         num_req++;
4296                         req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
4297                         if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
4298                                 ret_code = 1;
4299                                 goto strres_nochunk;
4300                         }
4301                         /* no more */
4302                         break;
4303                 } else if (ptype == SCTP_STR_RESET_RESPONSE) {
4304                         struct sctp_stream_reset_response *resp;
4305                         uint32_t result;
4306
4307                         if (param_len < sizeof(struct sctp_stream_reset_response)) {
4308                                 break;
4309                         }
4310                         resp = (struct sctp_stream_reset_response *)ph;
4311                         seq = ntohl(resp->response_seq);
4312                         result = ntohl(resp->result);
4313                         if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
4314                                 ret_code = 1;
4315                                 goto strres_nochunk;
4316                         }
4317                 } else {
4318                         break;
4319                 }
4320                 offset += SCTP_SIZE32(param_len);
4321                 if (remaining_length >= SCTP_SIZE32(param_len)) {
4322                         remaining_length -= SCTP_SIZE32(param_len);
4323                 } else {
4324                         remaining_length = 0;
4325                 }
4326         }
4327         if (num_req == 0) {
4328                 /* we have no response free the stuff */
4329                 goto strres_nochunk;
4330         }
4331         /* ok we have a chunk to link in */
4332         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
4333             chk,
4334             sctp_next);
4335         stcb->asoc.ctrl_queue_cnt++;
4336         return (ret_code);
4337 }
4338
4339 /*
4340  * Handle a router or endpoints report of a packet loss, there are two ways
4341  * to handle this, either we get the whole packet and must disect it
4342  * ourselves (possibly with truncation and or corruption) or it is a summary
4343  * from a middle box that did the disectting for us.
4344  */
4345 static void
4346 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
4347     struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
4348 {
4349         uint32_t bottle_bw, on_queue;
4350         uint16_t trunc_len;
4351         unsigned int chlen;
4352         unsigned int at;
4353         struct sctp_chunk_desc desc;
4354         struct sctp_chunkhdr *ch;
4355
4356         chlen = ntohs(cp->ch.chunk_length);
4357         chlen -= sizeof(struct sctp_pktdrop_chunk);
4358         /* XXX possible chlen underflow */
4359         if (chlen == 0) {
4360                 ch = NULL;
4361                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
4362                         SCTP_STAT_INCR(sctps_pdrpbwrpt);
4363         } else {
4364                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
4365                 chlen -= sizeof(struct sctphdr);
4366                 /* XXX possible chlen underflow */
4367                 memset(&desc, 0, sizeof(desc));
4368         }
4369         trunc_len = (uint16_t) ntohs(cp->trunc_len);
4370         if (trunc_len > limit) {
4371                 trunc_len = limit;
4372         }
4373         /* now the chunks themselves */
4374         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
4375                 desc.chunk_type = ch->chunk_type;
4376                 /* get amount we need to move */
4377                 at = ntohs(ch->chunk_length);
4378                 if (at < sizeof(struct sctp_chunkhdr)) {
4379                         /* corrupt chunk, maybe at the end? */
4380                         SCTP_STAT_INCR(sctps_pdrpcrupt);
4381                         break;
4382                 }
4383                 if (trunc_len == 0) {
4384                         /* we are supposed to have all of it */
4385                         if (at > chlen) {
4386                                 /* corrupt skip it */
4387                                 SCTP_STAT_INCR(sctps_pdrpcrupt);
4388                                 break;
4389                         }
4390                 } else {
4391                         /* is there enough of it left ? */
4392                         if (desc.chunk_type == SCTP_DATA) {
4393                                 if (chlen < (sizeof(struct sctp_data_chunk) +
4394                                     sizeof(desc.data_bytes))) {
4395                                         break;
4396                                 }
4397                         } else {
4398                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4399                                         break;
4400                                 }
4401                         }
4402                 }
4403                 if (desc.chunk_type == SCTP_DATA) {
4404                         /* can we get out the tsn? */
4405                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4406                                 SCTP_STAT_INCR(sctps_pdrpmbda);
4407
4408                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
4409                                 /* yep */
4410                                 struct sctp_data_chunk *dcp;
4411                                 uint8_t *ddp;
4412                                 unsigned int iii;
4413
4414                                 dcp = (struct sctp_data_chunk *)ch;
4415                                 ddp = (uint8_t *) (dcp + 1);
4416                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
4417                                         desc.data_bytes[iii] = ddp[iii];
4418                                 }
4419                                 desc.tsn_ifany = dcp->dp.tsn;
4420                         } else {
4421                                 /* nope we are done. */
4422                                 SCTP_STAT_INCR(sctps_pdrpnedat);
4423                                 break;
4424                         }
4425                 } else {
4426                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
4427                                 SCTP_STAT_INCR(sctps_pdrpmbct);
4428                 }
4429
4430                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
4431                         SCTP_STAT_INCR(sctps_pdrppdbrk);
4432                         break;
4433                 }
4434                 if (SCTP_SIZE32(at) > chlen) {
4435                         break;
4436                 }
4437                 chlen -= SCTP_SIZE32(at);
4438                 if (chlen < sizeof(struct sctp_chunkhdr)) {
4439                         /* done, none left */
4440                         break;
4441                 }
4442                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
4443         }
4444         /* Now update any rwnd --- possibly */
4445         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
4446                 /* From a peer, we get a rwnd report */
4447                 uint32_t a_rwnd;
4448
4449                 SCTP_STAT_INCR(sctps_pdrpfehos);
4450
4451                 bottle_bw = ntohl(cp->bottle_bw);
4452                 on_queue = ntohl(cp->current_onq);
4453                 if (bottle_bw && on_queue) {
4454                         /* a rwnd report is in here */
4455                         if (bottle_bw > on_queue)
4456                                 a_rwnd = bottle_bw - on_queue;
4457                         else
4458                                 a_rwnd = 0;
4459
4460                         if (a_rwnd == 0)
4461                                 stcb->asoc.peers_rwnd = 0;
4462                         else {
4463                                 if (a_rwnd > stcb->asoc.total_flight) {
4464                                         stcb->asoc.peers_rwnd =
4465                                             a_rwnd - stcb->asoc.total_flight;
4466                                 } else {
4467                                         stcb->asoc.peers_rwnd = 0;
4468                                 }
4469                                 if (stcb->asoc.peers_rwnd <
4470                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
4471                                         /* SWS sender side engages */
4472                                         stcb->asoc.peers_rwnd = 0;
4473                                 }
4474                         }
4475                 }
4476         } else {
4477                 SCTP_STAT_INCR(sctps_pdrpfmbox);
4478         }
4479
4480         /* now middle boxes in sat networks get a cwnd bump */
4481         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
4482             (stcb->asoc.sat_t3_loss_recovery == 0) &&
4483             (stcb->asoc.sat_network)) {
4484                 /*
4485                  * This is debateable but for sat networks it makes sense
4486                  * Note if a T3 timer has went off, we will prohibit any
4487                  * changes to cwnd until we exit the t3 loss recovery.
4488                  */
4489                 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
4490                     net, cp, &bottle_bw, &on_queue);
4491         }
4492 }
4493
4494 /*
4495  * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
4496  * still contain IP/SCTP header - stcb: is the tcb found for this packet -
4497  * offset: offset into the mbuf chain to first chunkhdr - length: is the
4498  * length of the complete packet outputs: - length: modified to remaining
4499  * length after control processing - netp: modified to new sctp_nets after
4500  * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
4501  * bad packet,...) otherwise return the tcb for this packet
4502  */
4503 #ifdef __GNUC__
4504 __attribute__((noinline))
4505 #endif
4506         static struct sctp_tcb *
4507                  sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
4508              struct sockaddr *src, struct sockaddr *dst,
4509              struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
4510              struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
4511              uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
4512              uint32_t vrf_id, uint16_t port)
4513 {
4514         struct sctp_association *asoc;
4515         struct mbuf *op_err;
4516         char msg[SCTP_DIAG_INFO_LEN];
4517         uint32_t vtag_in;
4518         int num_chunks = 0;     /* number of control chunks processed */
4519         uint32_t chk_length;
4520         int ret;
4521         int abort_no_unlock = 0;
4522         int ecne_seen = 0;
4523
4524         /*
4525          * How big should this be, and should it be alloc'd? Lets try the
4526          * d-mtu-ceiling for now (2k) and that should hopefully work ...
4527          * until we get into jumbo grams and such..
4528          */
4529         uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
4530         struct sctp_tcb *locked_tcb = stcb;
4531         int got_auth = 0;
4532         uint32_t auth_offset = 0, auth_len = 0;
4533         int auth_skipped = 0;
4534         int asconf_cnt = 0;
4535
4536 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4537         struct socket *so;
4538
4539 #endif
4540
4541         SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
4542             iphlen, *offset, length, (void *)stcb);
4543
4544         /* validate chunk header length... */
4545         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
4546                 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
4547                     ntohs(ch->chunk_length));
4548                 if (locked_tcb) {
4549                         SCTP_TCB_UNLOCK(locked_tcb);
4550                 }
4551                 return (NULL);
4552         }
4553         /*
4554          * validate the verification tag
4555          */
4556         vtag_in = ntohl(sh->v_tag);
4557
4558         if (locked_tcb) {
4559                 SCTP_TCB_LOCK_ASSERT(locked_tcb);
4560         }
4561         if (ch->chunk_type == SCTP_INITIATION) {
4562                 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
4563                     ntohs(ch->chunk_length), vtag_in);
4564                 if (vtag_in != 0) {
4565                         /* protocol error- silently discard... */
4566                         SCTP_STAT_INCR(sctps_badvtag);
4567                         if (locked_tcb) {
4568                                 SCTP_TCB_UNLOCK(locked_tcb);
4569                         }
4570                         return (NULL);
4571                 }
4572         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
4573                 /*
4574                  * If there is no stcb, skip the AUTH chunk and process
4575                  * later after a stcb is found (to validate the lookup was
4576                  * valid.
4577                  */
4578                 if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
4579                     (stcb == NULL) &&
4580                     (inp->auth_supported == 1)) {
4581                         /* save this chunk for later processing */
4582                         auth_skipped = 1;
4583                         auth_offset = *offset;
4584                         auth_len = ntohs(ch->chunk_length);
4585
4586                         /* (temporarily) move past this chunk */
4587                         *offset += SCTP_SIZE32(auth_len);
4588                         if (*offset >= length) {
4589                                 /* no more data left in the mbuf chain */
4590                                 *offset = length;
4591                                 if (locked_tcb) {
4592                                         SCTP_TCB_UNLOCK(locked_tcb);
4593                                 }
4594                                 return (NULL);
4595                         }
4596                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4597                             sizeof(struct sctp_chunkhdr), chunk_buf);
4598                 }
4599                 if (ch == NULL) {
4600                         /* Help */
4601                         *offset = length;
4602                         if (locked_tcb) {
4603                                 SCTP_TCB_UNLOCK(locked_tcb);
4604                         }
4605                         return (NULL);
4606                 }
4607                 if (ch->chunk_type == SCTP_COOKIE_ECHO) {
4608                         goto process_control_chunks;
4609                 }
4610                 /*
4611                  * first check if it's an ASCONF with an unknown src addr we
4612                  * need to look inside to find the association
4613                  */
4614                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
4615                         struct sctp_chunkhdr *asconf_ch = ch;
4616                         uint32_t asconf_offset = 0, asconf_len = 0;
4617
4618                         /* inp's refcount may be reduced */
4619                         SCTP_INP_INCR_REF(inp);
4620
4621                         asconf_offset = *offset;
4622                         do {
4623                                 asconf_len = ntohs(asconf_ch->chunk_length);
4624                                 if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
4625                                         break;
4626                                 stcb = sctp_findassociation_ep_asconf(m,
4627                                     *offset,
4628                                     dst,
4629                                     sh, &inp, netp, vrf_id);
4630                                 if (stcb != NULL)
4631                                         break;
4632                                 asconf_offset += SCTP_SIZE32(asconf_len);
4633                                 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
4634                                     sizeof(struct sctp_chunkhdr), chunk_buf);
4635                         } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
4636                         if (stcb == NULL) {
4637                                 /*
4638                                  * reduce inp's refcount if not reduced in
4639                                  * sctp_findassociation_ep_asconf().
4640                                  */
4641                                 SCTP_INP_DECR_REF(inp);
4642                         } else {
4643                                 locked_tcb = stcb;
4644                         }
4645
4646                         /* now go back and verify any auth chunk to be sure */
4647                         if (auth_skipped && (stcb != NULL)) {
4648                                 struct sctp_auth_chunk *auth;
4649
4650                                 auth = (struct sctp_auth_chunk *)
4651                                     sctp_m_getptr(m, auth_offset,
4652                                     auth_len, chunk_buf);
4653                                 got_auth = 1;
4654                                 auth_skipped = 0;
4655                                 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
4656                                     auth_offset)) {
4657                                         /* auth HMAC failed so dump it */
4658                                         *offset = length;
4659                                         if (locked_tcb) {
4660                                                 SCTP_TCB_UNLOCK(locked_tcb);
4661                                         }
4662                                         return (NULL);
4663                                 } else {
4664                                         /* remaining chunks are HMAC checked */
4665                                         stcb->asoc.authenticated = 1;
4666                                 }
4667                         }
4668                 }
4669                 if (stcb == NULL) {
4670                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4671                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4672                             msg);
4673                         /* no association, so it's out of the blue... */
4674                         sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
4675                             mflowtype, mflowid, inp->fibnum,
4676                             vrf_id, port);
4677                         *offset = length;
4678                         if (locked_tcb) {
4679                                 SCTP_TCB_UNLOCK(locked_tcb);
4680                         }
4681                         return (NULL);
4682                 }
4683                 asoc = &stcb->asoc;
4684                 /* ABORT and SHUTDOWN can use either v_tag... */
4685                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
4686                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
4687                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
4688                         /* Take the T-bit always into account. */
4689                         if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
4690                             (vtag_in == asoc->my_vtag)) ||
4691                             (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
4692                             (vtag_in == asoc->peer_vtag))) {
4693                                 /* this is valid */
4694                         } else {
4695                                 /* drop this packet... */
4696                                 SCTP_STAT_INCR(sctps_badvtag);
4697                                 if (locked_tcb) {
4698                                         SCTP_TCB_UNLOCK(locked_tcb);
4699                                 }
4700                                 return (NULL);
4701                         }
4702                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
4703                         if (vtag_in != asoc->my_vtag) {
4704                                 /*
4705                                  * this could be a stale SHUTDOWN-ACK or the
4706                                  * peer never got the SHUTDOWN-COMPLETE and
4707                                  * is still hung; we have started a new asoc
4708                                  * but it won't complete until the shutdown
4709                                  * is completed
4710                                  */
4711                                 if (locked_tcb) {
4712                                         SCTP_TCB_UNLOCK(locked_tcb);
4713                                 }
4714                                 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
4715                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
4716                                     msg);
4717                                 sctp_handle_ootb(m, iphlen, *offset, src, dst,
4718                                     sh, inp, op_err,
4719                                     mflowtype, mflowid, fibnum,
4720                                     vrf_id, port);
4721                                 return (NULL);
4722                         }
4723                 } else {
4724                         /* for all other chunks, vtag must match */
4725                         if (vtag_in != asoc->my_vtag) {
4726                                 /* invalid vtag... */
4727                                 SCTPDBG(SCTP_DEBUG_INPUT3,
4728                                     "invalid vtag: %xh, expect %xh\n",
4729                                     vtag_in, asoc->my_vtag);
4730                                 SCTP_STAT_INCR(sctps_badvtag);
4731                                 if (locked_tcb) {
4732                                         SCTP_TCB_UNLOCK(locked_tcb);
4733                                 }
4734                                 *offset = length;
4735                                 return (NULL);
4736                         }
4737                 }
4738         }                       /* end if !SCTP_COOKIE_ECHO */
4739         /*
4740          * process all control chunks...
4741          */
4742         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
4743             (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
4744             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
4745             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
4746                 /* implied cookie-ack.. we must have lost the ack */
4747                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
4748                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
4749                             stcb->asoc.overall_error_count,
4750                             0,
4751                             SCTP_FROM_SCTP_INPUT,
4752                             __LINE__);
4753                 }
4754                 stcb->asoc.overall_error_count = 0;
4755                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
4756                     *netp);
4757         }
4758 process_control_chunks:
4759         while (IS_SCTP_CONTROL(ch)) {
4760                 /* validate chunk length */
4761                 chk_length = ntohs(ch->chunk_length);
4762                 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
4763                     ch->chunk_type, chk_length);
4764                 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
4765                 if (chk_length < sizeof(*ch) ||
4766                     (*offset + (int)chk_length) > length) {
4767                         *offset = length;
4768                         if (locked_tcb) {
4769                                 SCTP_TCB_UNLOCK(locked_tcb);
4770                         }
4771                         return (NULL);
4772                 }
4773                 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
4774                 /*
4775                  * INIT-ACK only gets the init ack "header" portion only
4776                  * because we don't have to process the peer's COOKIE. All
4777                  * others get a complete chunk.
4778                  */
4779                 if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
4780                     (ch->chunk_type == SCTP_INITIATION)) {
4781                         /* get an init-ack chunk */
4782                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4783                             sizeof(struct sctp_init_ack_chunk), chunk_buf);
4784                         if (ch == NULL) {
4785                                 *offset = length;
4786                                 if (locked_tcb) {
4787                                         SCTP_TCB_UNLOCK(locked_tcb);
4788                                 }
4789                                 return (NULL);
4790                         }
4791                 } else {
4792                         /* For cookies and all other chunks. */
4793                         if (chk_length > sizeof(chunk_buf)) {
4794                                 /*
4795                                  * use just the size of the chunk buffer so
4796                                  * the front part of our chunks fit in
4797                                  * contiguous space up to the chunk buffer
4798                                  * size (508 bytes). For chunks that need to
4799                                  * get more than that they must use the
4800                                  * sctp_m_getptr() function or other means
4801                                  * (e.g. know how to parse mbuf chains).
4802                                  * Cookies do this already.
4803                                  */
4804                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4805                                     (sizeof(chunk_buf) - 4),
4806                                     chunk_buf);
4807                                 if (ch == NULL) {
4808                                         *offset = length;
4809                                         if (locked_tcb) {
4810                                                 SCTP_TCB_UNLOCK(locked_tcb);
4811                                         }
4812                                         return (NULL);
4813                                 }
4814                         } else {
4815                                 /* We can fit it all */
4816                                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
4817                                     chk_length, chunk_buf);
4818                                 if (ch == NULL) {
4819                                         SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
4820                                         *offset = length;
4821                                         if (locked_tcb) {
4822                                                 SCTP_TCB_UNLOCK(locked_tcb);
4823                                         }
4824                                         return (NULL);
4825                                 }
4826                         }
4827                 }
4828                 num_chunks++;
4829                 /* Save off the last place we got a control from */
4830                 if (stcb != NULL) {
4831                         if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
4832                                 /*
4833                                  * allow last_control to be NULL if
4834                                  * ASCONF... ASCONF processing will find the
4835                                  * right net later
4836                                  */
4837                                 if ((netp != NULL) && (*netp != NULL))
4838                                         stcb->asoc.last_control_chunk_from = *netp;
4839                         }
4840                 }
4841 #ifdef SCTP_AUDITING_ENABLED
4842                 sctp_audit_log(0xB0, ch->chunk_type);
4843 #endif
4844
4845                 /* check to see if this chunk required auth, but isn't */
4846                 if ((stcb != NULL) &&
4847                     (stcb->asoc.auth_supported == 1) &&
4848                     sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
4849                     !stcb->asoc.authenticated) {
4850                         /* "silently" ignore */
4851                         SCTP_STAT_INCR(sctps_recvauthmissing);
4852                         goto next_chunk;
4853                 }
4854                 switch (ch->chunk_type) {
4855                 case SCTP_INITIATION:
4856                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
4857                         /* The INIT chunk must be the only chunk. */
4858                         if ((num_chunks > 1) ||
4859                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4860                                 /* RFC 4960 requires that no ABORT is sent */
4861                                 *offset = length;
4862                                 if (locked_tcb) {
4863                                         SCTP_TCB_UNLOCK(locked_tcb);
4864                                 }
4865                                 return (NULL);
4866                         }
4867                         /* Honor our resource limit. */
4868                         if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
4869                                 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
4870                                 sctp_abort_association(inp, stcb, m, iphlen,
4871                                     src, dst, sh, op_err,
4872                                     mflowtype, mflowid,
4873                                     vrf_id, port);
4874                                 *offset = length;
4875                                 return (NULL);
4876                         }
4877                         sctp_handle_init(m, iphlen, *offset, src, dst, sh,
4878                             (struct sctp_init_chunk *)ch, inp,
4879                             stcb, *netp, &abort_no_unlock,
4880                             mflowtype, mflowid,
4881                             vrf_id, port);
4882                         *offset = length;
4883                         if ((!abort_no_unlock) && (locked_tcb)) {
4884                                 SCTP_TCB_UNLOCK(locked_tcb);
4885                         }
4886                         return (NULL);
4887                         break;
4888                 case SCTP_PAD_CHUNK:
4889                         break;
4890                 case SCTP_INITIATION_ACK:
4891                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
4892                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
4893                                 /* We are not interested anymore */
4894                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
4895                                         ;
4896                                 } else {
4897                                         if ((locked_tcb != NULL) && (locked_tcb != stcb)) {
4898                                                 /* Very unlikely */
4899                                                 SCTP_TCB_UNLOCK(locked_tcb);
4900                                         }
4901                                         *offset = length;
4902                                         if (stcb) {
4903 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4904                                                 so = SCTP_INP_SO(inp);
4905                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
4906                                                 SCTP_TCB_UNLOCK(stcb);
4907                                                 SCTP_SOCKET_LOCK(so, 1);
4908                                                 SCTP_TCB_LOCK(stcb);
4909                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
4910 #endif
4911                                                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
4912                                                     SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
4913 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
4914                                                 SCTP_SOCKET_UNLOCK(so, 1);
4915 #endif
4916                                         }
4917                                         return (NULL);
4918                                 }
4919                         }
4920                         /* The INIT-ACK chunk must be the only chunk. */
4921                         if ((num_chunks > 1) ||
4922                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
4923                                 *offset = length;
4924                                 if (locked_tcb) {
4925                                         SCTP_TCB_UNLOCK(locked_tcb);
4926                                 }
4927                                 return (NULL);
4928                         }
4929                         if ((netp) && (*netp)) {
4930                                 ret = sctp_handle_init_ack(m, iphlen, *offset,
4931                                     src, dst, sh,
4932                                     (struct sctp_init_ack_chunk *)ch,
4933                                     stcb, *netp,
4934                                     &abort_no_unlock,
4935                                     mflowtype, mflowid,
4936                                     vrf_id);
4937                         } else {
4938                                 ret = -1;
4939                         }
4940                         *offset = length;
4941                         if (abort_no_unlock) {
4942                                 return (NULL);
4943                         }
4944                         /*
4945                          * Special case, I must call the output routine to
4946                          * get the cookie echoed
4947                          */
4948                         if ((stcb != NULL) && (ret == 0)) {
4949                                 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
4950                         }
4951                         if (locked_tcb) {
4952                                 SCTP_TCB_UNLOCK(locked_tcb);
4953                         }
4954                         return (NULL);
4955                         break;
4956                 case SCTP_SELECTIVE_ACK:
4957                         {
4958                                 struct sctp_sack_chunk *sack;
4959                                 int abort_now = 0;
4960                                 uint32_t a_rwnd, cum_ack;
4961                                 uint16_t num_seg, num_dup;
4962                                 uint8_t flags;
4963                                 int offset_seg, offset_dup;
4964
4965                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
4966                                 SCTP_STAT_INCR(sctps_recvsacks);
4967                                 if (stcb == NULL) {
4968                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
4969                                         break;
4970                                 }
4971                                 if (chk_length < sizeof(struct sctp_sack_chunk)) {
4972                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
4973                                         break;
4974                                 }
4975                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
4976                                         /*-
4977                                          * If we have sent a shutdown-ack, we will pay no
4978                                          * attention to a sack sent in to us since
4979                                          * we don't care anymore.
4980                                          */
4981                                         break;
4982                                 }
4983                                 sack = (struct sctp_sack_chunk *)ch;
4984                                 flags = ch->chunk_flags;
4985                                 cum_ack = ntohl(sack->sack.cum_tsn_ack);
4986                                 num_seg = ntohs(sack->sack.num_gap_ack_blks);
4987                                 num_dup = ntohs(sack->sack.num_dup_tsns);
4988                                 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
4989                                 if (sizeof(struct sctp_sack_chunk) +
4990                                     num_seg * sizeof(struct sctp_gap_ack_block) +
4991                                     num_dup * sizeof(uint32_t) != chk_length) {
4992                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
4993                                         break;
4994                                 }
4995                                 offset_seg = *offset + sizeof(struct sctp_sack_chunk);
4996                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
4997                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
4998                                     cum_ack, num_seg, a_rwnd);
4999                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5000                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5001                                     (num_seg == 0) &&
5002                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5003                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5004                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5005                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
5006                                     ) {
5007                                         /*
5008                                          * We have a SIMPLE sack having no
5009                                          * prior segments and data on sent
5010                                          * queue to be acked.. Use the
5011                                          * faster path sack processing. We
5012                                          * also allow window update sacks
5013                                          * with no missing segments to go
5014                                          * this way too.
5015                                          */
5016                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
5017                                 } else {
5018                                         if (netp && *netp)
5019                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5020                                                     num_seg, 0, num_dup, &abort_now, flags,
5021                                                     cum_ack, a_rwnd, ecne_seen);
5022                                 }
5023                                 if (abort_now) {
5024                                         /* ABORT signal from sack processing */
5025                                         *offset = length;
5026                                         return (NULL);
5027                                 }
5028                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5029                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5030                                     (stcb->asoc.stream_queue_cnt == 0)) {
5031                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5032                                 }
5033                         }
5034                         break;
5035                         /*
5036                          * EY - nr_sack:  If the received chunk is an
5037                          * nr_sack chunk
5038                          */
5039                 case SCTP_NR_SELECTIVE_ACK:
5040                         {
5041                                 struct sctp_nr_sack_chunk *nr_sack;
5042                                 int abort_now = 0;
5043                                 uint32_t a_rwnd, cum_ack;
5044                                 uint16_t num_seg, num_nr_seg, num_dup;
5045                                 uint8_t flags;
5046                                 int offset_seg, offset_dup;
5047
5048                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
5049                                 SCTP_STAT_INCR(sctps_recvsacks);
5050                                 if (stcb == NULL) {
5051                                         SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
5052                                         break;
5053                                 }
5054                                 if (stcb->asoc.nrsack_supported == 0) {
5055                                         goto unknown_chunk;
5056                                 }
5057                                 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
5058                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
5059                                         break;
5060                                 }
5061                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
5062                                         /*-
5063                                          * If we have sent a shutdown-ack, we will pay no
5064                                          * attention to a sack sent in to us since
5065                                          * we don't care anymore.
5066                                          */
5067                                         break;
5068                                 }
5069                                 nr_sack = (struct sctp_nr_sack_chunk *)ch;
5070                                 flags = ch->chunk_flags;
5071                                 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
5072                                 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
5073                                 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
5074                                 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
5075                                 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
5076                                 if (sizeof(struct sctp_nr_sack_chunk) +
5077                                     (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
5078                                     num_dup * sizeof(uint32_t) != chk_length) {
5079                                         SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
5080                                         break;
5081                                 }
5082                                 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
5083                                 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
5084                                 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
5085                                     cum_ack, num_seg, a_rwnd);
5086                                 stcb->asoc.seen_a_sack_this_pkt = 1;
5087                                 if ((stcb->asoc.pr_sctp_cnt == 0) &&
5088                                     (num_seg == 0) && (num_nr_seg == 0) &&
5089                                     SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
5090                                     (stcb->asoc.saw_sack_with_frags == 0) &&
5091                                     (stcb->asoc.saw_sack_with_nr_frags == 0) &&
5092                                     (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
5093                                         /*
5094                                          * We have a SIMPLE sack having no
5095                                          * prior segments and data on sent
5096                                          * queue to be acked. Use the faster
5097                                          * path sack processing. We also
5098                                          * allow window update sacks with no
5099                                          * missing segments to go this way
5100                                          * too.
5101                                          */
5102                                         sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
5103                                             &abort_now, ecne_seen);
5104                                 } else {
5105                                         if (netp && *netp)
5106                                                 sctp_handle_sack(m, offset_seg, offset_dup, stcb,
5107                                                     num_seg, num_nr_seg, num_dup, &abort_now, flags,
5108                                                     cum_ack, a_rwnd, ecne_seen);
5109                                 }
5110                                 if (abort_now) {
5111                                         /* ABORT signal from sack processing */
5112                                         *offset = length;
5113                                         return (NULL);
5114                                 }
5115                                 if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
5116                                     TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
5117                                     (stcb->asoc.stream_queue_cnt == 0)) {
5118                                         sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
5119                                 }
5120                         }
5121                         break;
5122
5123                 case SCTP_HEARTBEAT_REQUEST:
5124                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
5125                         if ((stcb) && netp && *netp) {
5126                                 SCTP_STAT_INCR(sctps_recvheartbeat);
5127                                 sctp_send_heartbeat_ack(stcb, m, *offset,
5128                                     chk_length, *netp);
5129
5130                                 /* He's alive so give him credit */
5131                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5132                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5133                                             stcb->asoc.overall_error_count,
5134                                             0,
5135                                             SCTP_FROM_SCTP_INPUT,
5136                                             __LINE__);
5137                                 }
5138                                 stcb->asoc.overall_error_count = 0;
5139                         }
5140                         break;
5141                 case SCTP_HEARTBEAT_ACK:
5142                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
5143                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
5144                                 /* Its not ours */
5145                                 *offset = length;
5146                                 if (locked_tcb) {
5147                                         SCTP_TCB_UNLOCK(locked_tcb);
5148                                 }
5149                                 return (NULL);
5150                         }
5151                         /* He's alive so give him credit */
5152                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5153                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5154                                     stcb->asoc.overall_error_count,
5155                                     0,
5156                                     SCTP_FROM_SCTP_INPUT,
5157                                     __LINE__);
5158                         }
5159                         stcb->asoc.overall_error_count = 0;
5160                         SCTP_STAT_INCR(sctps_recvheartbeatack);
5161                         if (netp && *netp)
5162                                 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
5163                                     stcb, *netp);
5164                         break;
5165                 case SCTP_ABORT_ASSOCIATION:
5166                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
5167                             (void *)stcb);
5168                         if ((stcb) && netp && *netp)
5169                                 sctp_handle_abort((struct sctp_abort_chunk *)ch,
5170                                     stcb, *netp);
5171                         *offset = length;
5172                         return (NULL);
5173                         break;
5174                 case SCTP_SHUTDOWN:
5175                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
5176                             (void *)stcb);
5177                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
5178                                 *offset = length;
5179                                 if (locked_tcb) {
5180                                         SCTP_TCB_UNLOCK(locked_tcb);
5181                                 }
5182                                 return (NULL);
5183                         }
5184                         if (netp && *netp) {
5185                                 int abort_flag = 0;
5186
5187                                 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
5188                                     stcb, *netp, &abort_flag);
5189                                 if (abort_flag) {
5190                                         *offset = length;
5191                                         return (NULL);
5192                                 }
5193                         }
5194                         break;
5195                 case SCTP_SHUTDOWN_ACK:
5196                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
5197                         if ((stcb) && (netp) && (*netp))
5198                                 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
5199                         *offset = length;
5200                         return (NULL);
5201                         break;
5202
5203                 case SCTP_OPERATION_ERROR:
5204                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
5205                         if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
5206                                 *offset = length;
5207                                 return (NULL);
5208                         }
5209                         break;
5210                 case SCTP_COOKIE_ECHO:
5211                         SCTPDBG(SCTP_DEBUG_INPUT3,
5212                             "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
5213                         if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5214                                 ;
5215                         } else {
5216                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5217                                         /* We are not interested anymore */
5218                         abend:
5219                                         if (stcb) {
5220                                                 SCTP_TCB_UNLOCK(stcb);
5221                                         }
5222                                         *offset = length;
5223                                         return (NULL);
5224                                 }
5225                         }
5226                         /*
5227                          * First are we accepting? We do this again here
5228                          * since it is possible that a previous endpoint WAS
5229                          * listening responded to a INIT-ACK and then
5230                          * closed. We opened and bound.. and are now no
5231                          * longer listening.
5232                          */
5233
5234                         if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
5235                                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
5236                                     (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
5237                                         op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
5238                                         sctp_abort_association(inp, stcb, m, iphlen,
5239                                             src, dst, sh, op_err,
5240                                             mflowtype, mflowid,
5241                                             vrf_id, port);
5242                                 }
5243                                 *offset = length;
5244                                 return (NULL);
5245                         } else {
5246                                 struct mbuf *ret_buf;
5247                                 struct sctp_inpcb *linp;
5248
5249                                 if (stcb) {
5250                                         linp = NULL;
5251                                 } else {
5252                                         linp = inp;
5253                                 }
5254
5255                                 if (linp) {
5256                                         SCTP_ASOC_CREATE_LOCK(linp);
5257                                         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
5258                                             (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
5259                                                 SCTP_ASOC_CREATE_UNLOCK(linp);
5260                                                 goto abend;
5261                                         }
5262                                 }
5263                                 if (netp) {
5264                                         ret_buf =
5265                                             sctp_handle_cookie_echo(m, iphlen,
5266                                             *offset,
5267                                             src, dst,
5268                                             sh,
5269                                             (struct sctp_cookie_echo_chunk *)ch,
5270                                             &inp, &stcb, netp,
5271                                             auth_skipped,
5272                                             auth_offset,
5273                                             auth_len,
5274                                             &locked_tcb,
5275                                             mflowtype,
5276                                             mflowid,
5277                                             vrf_id,
5278                                             port);
5279                                 } else {
5280                                         ret_buf = NULL;
5281                                 }
5282                                 if (linp) {
5283                                         SCTP_ASOC_CREATE_UNLOCK(linp);
5284                                 }
5285                                 if (ret_buf == NULL) {
5286                                         if (locked_tcb) {
5287                                                 SCTP_TCB_UNLOCK(locked_tcb);
5288                                         }
5289                                         SCTPDBG(SCTP_DEBUG_INPUT3,
5290                                             "GAK, null buffer\n");
5291                                         *offset = length;
5292                                         return (NULL);
5293                                 }
5294                                 /* if AUTH skipped, see if it verified... */
5295                                 if (auth_skipped) {
5296                                         got_auth = 1;
5297                                         auth_skipped = 0;
5298                                 }
5299                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
5300                                         /*
5301                                          * Restart the timer if we have
5302                                          * pending data
5303                                          */
5304                                         struct sctp_tmit_chunk *chk;
5305
5306                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
5307                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
5308                                 }
5309                         }
5310                         break;
5311                 case SCTP_COOKIE_ACK:
5312                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
5313                         if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
5314                                 if (locked_tcb) {
5315                                         SCTP_TCB_UNLOCK(locked_tcb);
5316                                 }
5317                                 return (NULL);
5318                         }
5319                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5320                                 /* We are not interested anymore */
5321                                 if ((stcb) && (stcb->asoc.total_output_queue_size)) {
5322                                         ;
5323                                 } else if (stcb) {
5324 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5325                                         so = SCTP_INP_SO(inp);
5326                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5327                                         SCTP_TCB_UNLOCK(stcb);
5328                                         SCTP_SOCKET_LOCK(so, 1);
5329                                         SCTP_TCB_LOCK(stcb);
5330                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5331 #endif
5332                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5333                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
5334 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5335                                         SCTP_SOCKET_UNLOCK(so, 1);
5336 #endif
5337                                         *offset = length;
5338                                         return (NULL);
5339                                 }
5340                         }
5341                         /* He's alive so give him credit */
5342                         if ((stcb) && netp && *netp) {
5343                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5344                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5345                                             stcb->asoc.overall_error_count,
5346                                             0,
5347                                             SCTP_FROM_SCTP_INPUT,
5348                                             __LINE__);
5349                                 }
5350                                 stcb->asoc.overall_error_count = 0;
5351                                 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
5352                         }
5353                         break;
5354                 case SCTP_ECN_ECHO:
5355                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
5356                         /* He's alive so give him credit */
5357                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
5358                                 /* Its not ours */
5359                                 if (locked_tcb) {
5360                                         SCTP_TCB_UNLOCK(locked_tcb);
5361                                 }
5362                                 *offset = length;
5363                                 return (NULL);
5364                         }
5365                         if (stcb) {
5366                                 if (stcb->asoc.ecn_supported == 0) {
5367                                         goto unknown_chunk;
5368                                 }
5369                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5370                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5371                                             stcb->asoc.overall_error_count,
5372                                             0,
5373                                             SCTP_FROM_SCTP_INPUT,
5374                                             __LINE__);
5375                                 }
5376                                 stcb->asoc.overall_error_count = 0;
5377                                 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
5378                                     stcb);
5379                                 ecne_seen = 1;
5380                         }
5381                         break;
5382                 case SCTP_ECN_CWR:
5383                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
5384                         /* He's alive so give him credit */
5385                         if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
5386                                 /* Its not ours */
5387                                 if (locked_tcb) {
5388                                         SCTP_TCB_UNLOCK(locked_tcb);
5389                                 }
5390                                 *offset = length;
5391                                 return (NULL);
5392                         }
5393                         if (stcb) {
5394                                 if (stcb->asoc.ecn_supported == 0) {
5395                                         goto unknown_chunk;
5396                                 }
5397                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5398                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5399                                             stcb->asoc.overall_error_count,
5400                                             0,
5401                                             SCTP_FROM_SCTP_INPUT,
5402                                             __LINE__);
5403                                 }
5404                                 stcb->asoc.overall_error_count = 0;
5405                                 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
5406                         }
5407                         break;
5408                 case SCTP_SHUTDOWN_COMPLETE:
5409                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
5410                         /* must be first and only chunk */
5411                         if ((num_chunks > 1) ||
5412                             (length - *offset > (int)SCTP_SIZE32(chk_length))) {
5413                                 *offset = length;
5414                                 if (locked_tcb) {
5415                                         SCTP_TCB_UNLOCK(locked_tcb);
5416                                 }
5417                                 return (NULL);
5418                         }
5419                         if ((stcb) && netp && *netp) {
5420                                 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
5421                                     stcb, *netp);
5422                         }
5423                         *offset = length;
5424                         return (NULL);
5425                         break;
5426                 case SCTP_ASCONF:
5427                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
5428                         /* He's alive so give him credit */
5429                         if (stcb) {
5430                                 if (stcb->asoc.asconf_supported == 0) {
5431                                         goto unknown_chunk;
5432                                 }
5433                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5434                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5435                                             stcb->asoc.overall_error_count,
5436                                             0,
5437                                             SCTP_FROM_SCTP_INPUT,
5438                                             __LINE__);
5439                                 }
5440                                 stcb->asoc.overall_error_count = 0;
5441                                 sctp_handle_asconf(m, *offset, src,
5442                                     (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
5443                                 asconf_cnt++;
5444                         }
5445                         break;
5446                 case SCTP_ASCONF_ACK:
5447                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
5448                         if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
5449                                 /* Its not ours */
5450                                 if (locked_tcb) {
5451                                         SCTP_TCB_UNLOCK(locked_tcb);
5452                                 }
5453                                 *offset = length;
5454                                 return (NULL);
5455                         }
5456                         if ((stcb) && netp && *netp) {
5457                                 if (stcb->asoc.asconf_supported == 0) {
5458                                         goto unknown_chunk;
5459                                 }
5460                                 /* He's alive so give him credit */
5461                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5462                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5463                                             stcb->asoc.overall_error_count,
5464                                             0,
5465                                             SCTP_FROM_SCTP_INPUT,
5466                                             __LINE__);
5467                                 }
5468                                 stcb->asoc.overall_error_count = 0;
5469                                 sctp_handle_asconf_ack(m, *offset,
5470                                     (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
5471                                 if (abort_no_unlock)
5472                                         return (NULL);
5473                         }
5474                         break;
5475                 case SCTP_FORWARD_CUM_TSN:
5476                 case SCTP_IFORWARD_CUM_TSN:
5477                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
5478                         if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
5479                                 /* Its not ours */
5480                                 if (locked_tcb) {
5481                                         SCTP_TCB_UNLOCK(locked_tcb);
5482                                 }
5483                                 *offset = length;
5484                                 return (NULL);
5485                         }
5486                         /* He's alive so give him credit */
5487                         if (stcb) {
5488                                 int abort_flag = 0;
5489
5490                                 if (stcb->asoc.prsctp_supported == 0) {
5491                                         goto unknown_chunk;
5492                                 }
5493                                 stcb->asoc.overall_error_count = 0;
5494                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5495                                         sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5496                                             stcb->asoc.overall_error_count,
5497                                             0,
5498                                             SCTP_FROM_SCTP_INPUT,
5499                                             __LINE__);
5500                                 }
5501                                 *fwd_tsn_seen = 1;
5502                                 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
5503                                         /* We are not interested anymore */
5504 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5505                                         so = SCTP_INP_SO(inp);
5506                                         atomic_add_int(&stcb->asoc.refcnt, 1);
5507                                         SCTP_TCB_UNLOCK(stcb);
5508                                         SCTP_SOCKET_LOCK(so, 1);
5509                                         SCTP_TCB_LOCK(stcb);
5510                                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
5511 #endif
5512                                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
5513                                             SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
5514 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
5515                                         SCTP_SOCKET_UNLOCK(so, 1);
5516 #endif
5517                                         *offset = length;
5518                                         return (NULL);
5519                                 }
5520                                 sctp_handle_forward_tsn(stcb,
5521                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
5522                                 if (abort_flag) {
5523                                         *offset = length;
5524                                         return (NULL);
5525                                 } else {
5526                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5527                                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5528                                                     stcb->asoc.overall_error_count,
5529                                                     0,
5530                                                     SCTP_FROM_SCTP_INPUT,
5531                                                     __LINE__);
5532                                         }
5533                                         stcb->asoc.overall_error_count = 0;
5534                                 }
5535
5536                         }
5537                         break;
5538                 case SCTP_STREAM_RESET:
5539                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
5540                         if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
5541                                 /* Its not ours */
5542                                 if (locked_tcb) {
5543                                         SCTP_TCB_UNLOCK(locked_tcb);
5544                                 }
5545                                 *offset = length;
5546                                 return (NULL);
5547                         }
5548                         if (stcb->asoc.reconfig_supported == 0) {
5549                                 goto unknown_chunk;
5550                         }
5551                         if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
5552                                 /* stop processing */
5553                                 *offset = length;
5554                                 return (NULL);
5555                         }
5556                         break;
5557                 case SCTP_PACKET_DROPPED:
5558                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
5559                         /* re-get it all please */
5560                         if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
5561                                 /* Its not ours */
5562                                 if (locked_tcb) {
5563                                         SCTP_TCB_UNLOCK(locked_tcb);
5564                                 }
5565                                 *offset = length;
5566                                 return (NULL);
5567                         }
5568                         if (ch && (stcb) && netp && (*netp)) {
5569                                 if (stcb->asoc.pktdrop_supported == 0) {
5570                                         goto unknown_chunk;
5571                                 }
5572                                 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
5573                                     stcb, *netp,
5574                                     min(chk_length, (sizeof(chunk_buf) - 4)));
5575
5576                         }
5577                         break;
5578                 case SCTP_AUTHENTICATION:
5579                         SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
5580                         if (stcb == NULL) {
5581                                 /* save the first AUTH for later processing */
5582                                 if (auth_skipped == 0) {
5583                                         auth_offset = *offset;
5584                                         auth_len = chk_length;
5585                                         auth_skipped = 1;
5586                                 }
5587                                 /* skip this chunk (temporarily) */
5588                                 goto next_chunk;
5589                         }
5590                         if (stcb->asoc.auth_supported == 0) {
5591                                 goto unknown_chunk;
5592                         }
5593                         if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
5594                             (chk_length > (sizeof(struct sctp_auth_chunk) +
5595                             SCTP_AUTH_DIGEST_LEN_MAX))) {
5596                                 /* Its not ours */
5597                                 if (locked_tcb) {
5598                                         SCTP_TCB_UNLOCK(locked_tcb);
5599                                 }
5600                                 *offset = length;
5601                                 return (NULL);
5602                         }
5603                         if (got_auth == 1) {
5604                                 /* skip this chunk... it's already auth'd */
5605                                 goto next_chunk;
5606                         }
5607                         got_auth = 1;
5608                         if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
5609                             m, *offset)) {
5610                                 /* auth HMAC failed so dump the packet */
5611                                 *offset = length;
5612                                 return (stcb);
5613                         } else {
5614                                 /* remaining chunks are HMAC checked */
5615                                 stcb->asoc.authenticated = 1;
5616                         }
5617                         break;
5618
5619                 default:
5620         unknown_chunk:
5621                         /* it's an unknown chunk! */
5622                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
5623                                 struct sctp_gen_error_cause *cause;
5624                                 int len;
5625
5626                                 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
5627                                     0, M_NOWAIT, 1, MT_DATA);
5628                                 if (op_err != NULL) {
5629                                         len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset));
5630                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
5631                                         cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
5632                                         cause->length = htons((uint16_t) (len + sizeof(struct sctp_gen_error_cause)));
5633                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
5634                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
5635                                         if (SCTP_BUF_NEXT(op_err) != NULL) {
5636 #ifdef SCTP_MBUF_LOGGING
5637                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
5638                                                         sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
5639                                                 }
5640 #endif
5641                                                 sctp_queue_op_err(stcb, op_err);
5642                                         } else {
5643                                                 sctp_m_freem(op_err);
5644                                         }
5645                                 }
5646                         }
5647                         if ((ch->chunk_type & 0x80) == 0) {
5648                                 /* discard this packet */
5649                                 *offset = length;
5650                                 return (stcb);
5651                         }       /* else skip this bad chunk and continue... */
5652                         break;
5653                 }               /* switch (ch->chunk_type) */
5654
5655
5656 next_chunk:
5657                 /* get the next chunk */
5658                 *offset += SCTP_SIZE32(chk_length);
5659                 if (*offset >= length) {
5660                         /* no more data left in the mbuf chain */
5661                         break;
5662                 }
5663                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
5664                     sizeof(struct sctp_chunkhdr), chunk_buf);
5665                 if (ch == NULL) {
5666                         if (locked_tcb) {
5667                                 SCTP_TCB_UNLOCK(locked_tcb);
5668                         }
5669                         *offset = length;
5670                         return (NULL);
5671                 }
5672         }                       /* while */
5673
5674         if (asconf_cnt > 0 && stcb != NULL) {
5675                 sctp_send_asconf_ack(stcb);
5676         }
5677         return (stcb);
5678 }
5679
5680
5681 /*
5682  * common input chunk processing (v4 and v6)
5683  */
5684 void
5685 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
5686     struct sockaddr *src, struct sockaddr *dst,
5687     struct sctphdr *sh, struct sctp_chunkhdr *ch,
5688 #if !defined(SCTP_WITH_NO_CSUM)
5689     uint8_t compute_crc,
5690 #endif
5691     uint8_t ecn_bits,
5692     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
5693     uint32_t vrf_id, uint16_t port)
5694 {
5695         uint32_t high_tsn;
5696         int fwd_tsn_seen = 0, data_processed = 0;
5697         struct mbuf *m = *mm, *op_err;
5698         char msg[SCTP_DIAG_INFO_LEN];
5699         int un_sent;
5700         int cnt_ctrl_ready = 0;
5701         struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
5702         struct sctp_tcb *stcb = NULL;
5703         struct sctp_nets *net = NULL;
5704
5705         SCTP_STAT_INCR(sctps_recvdatagrams);
5706 #ifdef SCTP_AUDITING_ENABLED
5707         sctp_audit_log(0xE0, 1);
5708         sctp_auditing(0, inp, stcb, net);
5709 #endif
5710 #if !defined(SCTP_WITH_NO_CSUM)
5711         if (compute_crc != 0) {
5712                 uint32_t check, calc_check;
5713
5714                 check = sh->checksum;
5715                 sh->checksum = 0;
5716                 calc_check = sctp_calculate_cksum(m, iphlen);
5717                 sh->checksum = check;
5718                 if (calc_check != check) {
5719                         SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
5720                             calc_check, check, (void *)m, length, iphlen);
5721                         stcb = sctp_findassociation_addr(m, offset, src, dst,
5722                             sh, ch, &inp, &net, vrf_id);
5723 #if defined(INET) || defined(INET6)
5724                         if ((ch->chunk_type != SCTP_INITIATION) &&
5725                             (net != NULL) && (net->port != port)) {
5726                                 if (net->port == 0) {
5727                                         /* UDP encapsulation turned on. */
5728                                         net->mtu -= sizeof(struct udphdr);
5729                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5730                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5731                                         }
5732                                 } else if (port == 0) {
5733                                         /* UDP encapsulation turned off. */
5734                                         net->mtu += sizeof(struct udphdr);
5735                                         /* XXX Update smallest_mtu */
5736                                 }
5737                                 net->port = port;
5738                         }
5739 #endif
5740                         if (net != NULL) {
5741                                 net->flowtype = mflowtype;
5742                                 net->flowid = mflowid;
5743                         }
5744                         if ((inp != NULL) && (stcb != NULL)) {
5745                                 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
5746                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
5747                         } else if ((inp != NULL) && (stcb == NULL)) {
5748                                 inp_decr = inp;
5749                         }
5750                         SCTP_STAT_INCR(sctps_badsum);
5751                         SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
5752                         goto out;
5753                 }
5754         }
5755 #endif
5756         /* Destination port of 0 is illegal, based on RFC4960. */
5757         if (sh->dest_port == 0) {
5758                 SCTP_STAT_INCR(sctps_hdrops);
5759                 goto out;
5760         }
5761         stcb = sctp_findassociation_addr(m, offset, src, dst,
5762             sh, ch, &inp, &net, vrf_id);
5763 #if defined(INET) || defined(INET6)
5764         if ((ch->chunk_type != SCTP_INITIATION) &&
5765             (net != NULL) && (net->port != port)) {
5766                 if (net->port == 0) {
5767                         /* UDP encapsulation turned on. */
5768                         net->mtu -= sizeof(struct udphdr);
5769                         if (stcb->asoc.smallest_mtu > net->mtu) {
5770                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5771                         }
5772                 } else if (port == 0) {
5773                         /* UDP encapsulation turned off. */
5774                         net->mtu += sizeof(struct udphdr);
5775                         /* XXX Update smallest_mtu */
5776                 }
5777                 net->port = port;
5778         }
5779 #endif
5780         if (net != NULL) {
5781                 net->flowtype = mflowtype;
5782                 net->flowid = mflowid;
5783         }
5784         if (inp == NULL) {
5785                 SCTP_STAT_INCR(sctps_noport);
5786                 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
5787                         goto out;
5788                 }
5789                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
5790                         sctp_send_shutdown_complete2(src, dst, sh,
5791                             mflowtype, mflowid, fibnum,
5792                             vrf_id, port);
5793                         goto out;
5794                 }
5795                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
5796                         goto out;
5797                 }
5798                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
5799                         if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
5800                             ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
5801                             (ch->chunk_type != SCTP_INIT))) {
5802                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5803                                     "Out of the blue");
5804                                 sctp_send_abort(m, iphlen, src, dst,
5805                                     sh, 0, op_err,
5806                                     mflowtype, mflowid, fibnum,
5807                                     vrf_id, port);
5808                         }
5809                 }
5810                 goto out;
5811         } else if (stcb == NULL) {
5812                 inp_decr = inp;
5813         }
5814 #ifdef IPSEC
5815         /*-
5816          * I very much doubt any of the IPSEC stuff will work but I have no
5817          * idea, so I will leave it in place.
5818          */
5819         if (inp != NULL) {
5820                 switch (dst->sa_family) {
5821 #ifdef INET
5822                 case AF_INET:
5823                         if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
5824                                 SCTP_STAT_INCR(sctps_hdrops);
5825                                 goto out;
5826                         }
5827                         break;
5828 #endif
5829 #ifdef INET6
5830                 case AF_INET6:
5831                         if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
5832                                 SCTP_STAT_INCR(sctps_hdrops);
5833                                 goto out;
5834                         }
5835                         break;
5836 #endif
5837                 default:
5838                         break;
5839                 }
5840         }
5841 #endif
5842         SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
5843             (void *)m, iphlen, offset, length, (void *)stcb);
5844         if (stcb) {
5845                 /* always clear this before beginning a packet */
5846                 stcb->asoc.authenticated = 0;
5847                 stcb->asoc.seen_a_sack_this_pkt = 0;
5848                 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
5849                     (void *)stcb, stcb->asoc.state);
5850
5851                 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
5852                     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
5853                         /*-
5854                          * If we hit here, we had a ref count
5855                          * up when the assoc was aborted and the
5856                          * timer is clearing out the assoc, we should
5857                          * NOT respond to any packet.. its OOTB.
5858                          */
5859                         SCTP_TCB_UNLOCK(stcb);
5860                         stcb = NULL;
5861                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5862                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5863                             msg);
5864                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5865                             mflowtype, mflowid, inp->fibnum,
5866                             vrf_id, port);
5867                         goto out;
5868                 }
5869         }
5870         if (IS_SCTP_CONTROL(ch)) {
5871                 /* process the control portion of the SCTP packet */
5872                 /* sa_ignore NO_NULL_CHK */
5873                 stcb = sctp_process_control(m, iphlen, &offset, length,
5874                     src, dst, sh, ch,
5875                     inp, stcb, &net, &fwd_tsn_seen,
5876                     mflowtype, mflowid, fibnum,
5877                     vrf_id, port);
5878                 if (stcb) {
5879                         /*
5880                          * This covers us if the cookie-echo was there and
5881                          * it changes our INP.
5882                          */
5883                         inp = stcb->sctp_ep;
5884 #if defined(INET) || defined(INET6)
5885                         if ((ch->chunk_type != SCTP_INITIATION) &&
5886                             (net != NULL) && (net->port != port)) {
5887                                 if (net->port == 0) {
5888                                         /* UDP encapsulation turned on. */
5889                                         net->mtu -= sizeof(struct udphdr);
5890                                         if (stcb->asoc.smallest_mtu > net->mtu) {
5891                                                 sctp_pathmtu_adjustment(stcb, net->mtu);
5892                                         }
5893                                 } else if (port == 0) {
5894                                         /* UDP encapsulation turned off. */
5895                                         net->mtu += sizeof(struct udphdr);
5896                                         /* XXX Update smallest_mtu */
5897                                 }
5898                                 net->port = port;
5899                         }
5900 #endif
5901                 }
5902         } else {
5903                 /*
5904                  * no control chunks, so pre-process DATA chunks (these
5905                  * checks are taken care of by control processing)
5906                  */
5907
5908                 /*
5909                  * if DATA only packet, and auth is required, then punt...
5910                  * can't have authenticated without any AUTH (control)
5911                  * chunks
5912                  */
5913                 if ((stcb != NULL) &&
5914                     (stcb->asoc.auth_supported == 1) &&
5915                     sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
5916                         /* "silently" ignore */
5917                         SCTP_STAT_INCR(sctps_recvauthmissing);
5918                         goto out;
5919                 }
5920                 if (stcb == NULL) {
5921                         /* out of the blue DATA chunk */
5922                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5923                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5924                             msg);
5925                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5926                             mflowtype, mflowid, fibnum,
5927                             vrf_id, port);
5928                         goto out;
5929                 }
5930                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
5931                         /* v_tag mismatch! */
5932                         SCTP_STAT_INCR(sctps_badvtag);
5933                         goto out;
5934                 }
5935         }
5936
5937         if (stcb == NULL) {
5938                 /*
5939                  * no valid TCB for this packet, or we found it's a bad
5940                  * packet while processing control, or we're done with this
5941                  * packet (done or skip rest of data), so we drop it...
5942                  */
5943                 goto out;
5944         }
5945         /*
5946          * DATA chunk processing
5947          */
5948         /* plow through the data chunks while length > offset */
5949
5950         /*
5951          * Rest should be DATA only.  Check authentication state if AUTH for
5952          * DATA is required.
5953          */
5954         if ((length > offset) &&
5955             (stcb != NULL) &&
5956             (stcb->asoc.auth_supported == 1) &&
5957             sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
5958             !stcb->asoc.authenticated) {
5959                 /* "silently" ignore */
5960                 SCTP_STAT_INCR(sctps_recvauthmissing);
5961                 SCTPDBG(SCTP_DEBUG_AUTH1,
5962                     "Data chunk requires AUTH, skipped\n");
5963                 goto trigger_send;
5964         }
5965         if (length > offset) {
5966                 int retval;
5967
5968                 /*
5969                  * First check to make sure our state is correct. We would
5970                  * not get here unless we really did have a tag, so we don't
5971                  * abort if this happens, just dump the chunk silently.
5972                  */
5973                 switch (SCTP_GET_STATE(&stcb->asoc)) {
5974                 case SCTP_STATE_COOKIE_ECHOED:
5975                         /*
5976                          * we consider data with valid tags in this state
5977                          * shows us the cookie-ack was lost. Imply it was
5978                          * there.
5979                          */
5980                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
5981                                 sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
5982                                     stcb->asoc.overall_error_count,
5983                                     0,
5984                                     SCTP_FROM_SCTP_INPUT,
5985                                     __LINE__);
5986                         }
5987                         stcb->asoc.overall_error_count = 0;
5988                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
5989                         break;
5990                 case SCTP_STATE_COOKIE_WAIT:
5991                         /*
5992                          * We consider OOTB any data sent during asoc setup.
5993                          */
5994                         snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
5995                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
5996                             msg);
5997                         sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
5998                             mflowtype, mflowid, inp->fibnum,
5999                             vrf_id, port);
6000                         goto out;
6001                         /* sa_ignore NOTREACHED */
6002                         break;
6003                 case SCTP_STATE_EMPTY:  /* should not happen */
6004                 case SCTP_STATE_INUSE:  /* should not happen */
6005                 case SCTP_STATE_SHUTDOWN_RECEIVED:      /* This is a peer error */
6006                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
6007                 default:
6008                         goto out;
6009                         /* sa_ignore NOTREACHED */
6010                         break;
6011                 case SCTP_STATE_OPEN:
6012                 case SCTP_STATE_SHUTDOWN_SENT:
6013                         break;
6014                 }
6015                 /* plow through the data chunks while length > offset */
6016                 retval = sctp_process_data(mm, iphlen, &offset, length,
6017                     inp, stcb, net, &high_tsn);
6018                 if (retval == 2) {
6019                         /*
6020                          * The association aborted, NO UNLOCK needed since
6021                          * the association is destroyed.
6022                          */
6023                         stcb = NULL;
6024                         goto out;
6025                 }
6026                 data_processed = 1;
6027                 /*
6028                  * Anything important needs to have been m_copy'ed in
6029                  * process_data
6030                  */
6031         }
6032         /* take care of ecn */
6033         if ((data_processed == 1) &&
6034             (stcb->asoc.ecn_supported == 1) &&
6035             ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
6036                 /* Yep, we need to add a ECNE */
6037                 sctp_send_ecn_echo(stcb, net, high_tsn);
6038         }
6039         if ((data_processed == 0) && (fwd_tsn_seen)) {
6040                 int was_a_gap;
6041                 uint32_t highest_tsn;
6042
6043                 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
6044                         highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
6045                 } else {
6046                         highest_tsn = stcb->asoc.highest_tsn_inside_map;
6047                 }
6048                 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
6049                 stcb->asoc.send_sack = 1;
6050                 sctp_sack_check(stcb, was_a_gap);
6051         } else if (fwd_tsn_seen) {
6052                 stcb->asoc.send_sack = 1;
6053         }
6054         /* trigger send of any chunks in queue... */
6055 trigger_send:
6056 #ifdef SCTP_AUDITING_ENABLED
6057         sctp_audit_log(0xE0, 2);
6058         sctp_auditing(1, inp, stcb, net);
6059 #endif
6060         SCTPDBG(SCTP_DEBUG_INPUT1,
6061             "Check for chunk output prw:%d tqe:%d tf=%d\n",
6062             stcb->asoc.peers_rwnd,
6063             TAILQ_EMPTY(&stcb->asoc.control_send_queue),
6064             stcb->asoc.total_flight);
6065         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
6066         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
6067                 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
6068         }
6069         if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
6070             cnt_ctrl_ready ||
6071             stcb->asoc.trigger_reset ||
6072             ((un_sent) &&
6073             (stcb->asoc.peers_rwnd > 0 ||
6074             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
6075                 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
6076                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
6077                 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
6078         }
6079 #ifdef SCTP_AUDITING_ENABLED
6080         sctp_audit_log(0xE0, 3);
6081         sctp_auditing(2, inp, stcb, net);
6082 #endif
6083 out:
6084         if (stcb != NULL) {
6085                 SCTP_TCB_UNLOCK(stcb);
6086         }
6087         if (inp_decr != NULL) {
6088                 /* reduce ref-count */
6089                 SCTP_INP_WLOCK(inp_decr);
6090                 SCTP_INP_DECR_REF(inp_decr);
6091                 SCTP_INP_WUNLOCK(inp_decr);
6092         }
6093         return;
6094 }
6095
6096 #ifdef INET
6097 void
6098 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
6099 {
6100         struct mbuf *m;
6101         int iphlen;
6102         uint32_t vrf_id = 0;
6103         uint8_t ecn_bits;
6104         struct sockaddr_in src, dst;
6105         struct ip *ip;
6106         struct sctphdr *sh;
6107         struct sctp_chunkhdr *ch;
6108         int length, offset;
6109
6110 #if !defined(SCTP_WITH_NO_CSUM)
6111         uint8_t compute_crc;
6112
6113 #endif
6114         uint32_t mflowid;
6115         uint8_t mflowtype;
6116         uint16_t fibnum;
6117
6118         iphlen = off;
6119         if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
6120                 SCTP_RELEASE_PKT(i_pak);
6121                 return;
6122         }
6123         m = SCTP_HEADER_TO_CHAIN(i_pak);
6124 #ifdef SCTP_MBUF_LOGGING
6125         /* Log in any input mbufs */
6126         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
6127                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
6128         }
6129 #endif
6130 #ifdef SCTP_PACKET_LOGGING
6131         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
6132                 sctp_packet_log(m);
6133         }
6134 #endif
6135         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
6136             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
6137             m->m_pkthdr.len,
6138             if_name(m->m_pkthdr.rcvif),
6139             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
6140         mflowid = m->m_pkthdr.flowid;
6141         mflowtype = M_HASHTYPE_GET(m);
6142         fibnum = M_GETFIB(m);
6143         SCTP_STAT_INCR(sctps_recvpackets);
6144         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
6145         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
6146         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
6147         if (SCTP_BUF_LEN(m) < offset) {
6148                 if ((m = m_pullup(m, offset)) == NULL) {
6149                         SCTP_STAT_INCR(sctps_hdrops);
6150                         return;
6151                 }
6152         }
6153         ip = mtod(m, struct ip *);
6154         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
6155         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
6156         offset -= sizeof(struct sctp_chunkhdr);
6157         memset(&src, 0, sizeof(struct sockaddr_in));
6158         src.sin_family = AF_INET;
6159         src.sin_len = sizeof(struct sockaddr_in);
6160         src.sin_port = sh->src_port;
6161         src.sin_addr = ip->ip_src;
6162         memset(&dst, 0, sizeof(struct sockaddr_in));
6163         dst.sin_family = AF_INET;
6164         dst.sin_len = sizeof(struct sockaddr_in);
6165         dst.sin_port = sh->dest_port;
6166         dst.sin_addr = ip->ip_dst;
6167         length = ntohs(ip->ip_len);
6168         /* Validate mbuf chain length with IP payload length. */
6169         if (SCTP_HEADER_LEN(m) != length) {
6170                 SCTPDBG(SCTP_DEBUG_INPUT1,
6171                     "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
6172                 SCTP_STAT_INCR(sctps_hdrops);
6173                 goto out;
6174         }
6175         /* SCTP does not allow broadcasts or multicasts */
6176         if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
6177                 goto out;
6178         }
6179         if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
6180                 goto out;
6181         }
6182         ecn_bits = ip->ip_tos;
6183 #if defined(SCTP_WITH_NO_CSUM)
6184         SCTP_STAT_INCR(sctps_recvnocrc);
6185 #else
6186         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
6187                 SCTP_STAT_INCR(sctps_recvhwcrc);
6188                 compute_crc = 0;
6189         } else {
6190                 SCTP_STAT_INCR(sctps_recvswcrc);
6191                 compute_crc = 1;
6192         }
6193 #endif
6194         sctp_common_input_processing(&m, iphlen, offset, length,
6195             (struct sockaddr *)&src,
6196             (struct sockaddr *)&dst,
6197             sh, ch,
6198 #if !defined(SCTP_WITH_NO_CSUM)
6199             compute_crc,
6200 #endif
6201             ecn_bits,
6202             mflowtype, mflowid, fibnum,
6203             vrf_id, port);
6204 out:
6205         if (m) {
6206                 sctp_m_freem(m);
6207         }
6208         return;
6209 }
6210
6211 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6212 extern int *sctp_cpuarry;
6213
6214 #endif
6215
6216 int
6217 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
6218 {
6219         struct mbuf *m;
6220         int off;
6221
6222         m = *mp;
6223         off = *offp;
6224 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
6225         if (mp_ncpus > 1) {
6226                 struct ip *ip;
6227                 struct sctphdr *sh;
6228                 int offset;
6229                 int cpu_to_use;
6230                 uint32_t flowid, tag;
6231
6232                 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
6233                         flowid = m->m_pkthdr.flowid;
6234                 } else {
6235                         /*
6236                          * No flow id built by lower layers fix it so we
6237                          * create one.
6238                          */
6239                         offset = off + sizeof(struct sctphdr);
6240                         if (SCTP_BUF_LEN(m) < offset) {
6241                                 if ((m = m_pullup(m, offset)) == NULL) {
6242                                         SCTP_STAT_INCR(sctps_hdrops);
6243                                         return (IPPROTO_DONE);
6244                                 }
6245                         }
6246                         ip = mtod(m, struct ip *);
6247                         sh = (struct sctphdr *)((caddr_t)ip + off);
6248                         tag = htonl(sh->v_tag);
6249                         flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
6250                         m->m_pkthdr.flowid = flowid;
6251                         M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
6252                 }
6253                 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
6254                 sctp_queue_to_mcore(m, off, cpu_to_use);
6255                 return (IPPROTO_DONE);
6256         }
6257 #endif
6258         sctp_input_with_port(m, off, 0);
6259         return (IPPROTO_DONE);
6260 }
6261
6262 #endif