sys/netinet/sctp_input.c

   1 /*      $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $     */
   2
   3 /*
   4  * Copyright (C) 2002, 2003, 2004 Cisco Systems Inc,
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #if !(defined(__OpenBSD__) || defined(__APPLE__))
  33 #include "opt_ipsec.h"
  34 #endif
  35 #if defined(__FreeBSD__) || defined(__DragonFly__)
  36 #include "opt_compat.h"
  37 #include "opt_inet6.h"
  38 #include "opt_inet.h"
  39 #endif
  40 #if defined(__NetBSD__)
  41 #include "opt_inet.h"
  42 #endif
  43 #ifdef __APPLE__
  44 #include <sctp.h>
  45 #elif !defined(__OpenBSD__)
  46 #include "opt_sctp.h"
  47 #endif
  48
  49 #include <sys/param.h>
  50 #include <sys/systm.h>
  51 #include <sys/malloc.h>
  52 #include <sys/mbuf.h>
  53 #include <sys/socket.h>
  54 #include <sys/socketvar.h>
  55 #include <sys/socketvar2.h>
  56 #include <sys/sysctl.h>
  57 #include <sys/domain.h>
  58 #include <sys/protosw.h>
  59 #include <sys/kernel.h>
  60 #include <sys/errno.h>
  61 #include <sys/syslog.h>
  62 #include <sys/thread2.h>
  63
  64 #if (defined(__FreeBSD__) && __FreeBSD_version >= 500000)
  65 #include <sys/limits.h>
  66 #else
  67 #include <machine/limits.h>
  68 #endif
  69 #include <machine/cpu.h>
  70
  71 #include <net/if.h>
  72 #include <net/route.h>
  73 #include <net/if_types.h>
  74
  75 #include <netinet/in.h>
  76 #include <netinet/in_systm.h>
  77 #include <netinet/ip.h>
  78 #include <netinet/in_pcb.h>
  79 #include <netinet/in_var.h>
  80 #include <netinet/ip_var.h>
  81
  82 #ifdef INET6
  83 #include <netinet/ip6.h>
  84 #include <netinet6/ip6_var.h>
  85 #endif /* INET6 */
  86
  87 #include <netinet/ip_icmp.h>
  88 #include <netinet/icmp_var.h>
  89 #include <netinet/sctp_var.h>
  90 #include <netinet/sctp_pcb.h>
  91 #include <netinet/sctp_header.h>
  92 #include <netinet/sctputil.h>
  93 #include <netinet/sctp_output.h>
  94 #include <netinet/sctp_input.h>
  95 #include <netinet/sctp_hashdriver.h>
  96 #include <netinet/sctp_indata.h>
  97 #include <netinet/sctp_asconf.h>
  98
  99 #ifdef __APPLE__
 100 #include <stdarg.h>
 101 #elif !defined(__FreeBSD__)
 102 #include <machine/stdarg.h>
 103 #endif
 104
 105 #ifdef IPSEC
 106 #ifndef __OpenBSD__
 107 #include <netinet6/ipsec.h>
 108 #include <netproto/key/key.h>
 109 #else
 110 #undef IPSEC
 111 #endif
 112 #endif /*IPSEC*/
 113
 114 #include <net/net_osdep.h>
 115
 116 #ifdef SCTP_DEBUG
 117 extern u_int32_t sctp_debug_on;
 118 #endif
 119
 120 /* INIT handler */
 121 static void
 122 sctp_handle_init(struct mbuf *m, int iphlen, int offset,
 123     struct sctphdr *sh, struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
 124     struct sctp_tcb *stcb, struct sctp_nets *net)
 125 {
 126         struct sctp_init *init;
 127         struct mbuf *op_err;
 128 #ifdef SCTP_DEBUG
 129         if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 130                 kprintf("sctp_handle_init: handling INIT tcb:%p\n", stcb);
 131         }
 132 #endif
 133         op_err = NULL;
 134         init = &cp->init;
 135         /* First are we accepting? */
 136         if (((inp->sctp_flags & SCTP_PCB_FLAGS_ACCEPTING) == 0) ||
 137             (inp->sctp_socket->so_qlimit == 0)) {
 138                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err);
 139                 return;
 140         }
 141         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
 142                 /* Invalid length */
 143                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 144                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err);
 145                 return;
 146         }
 147         /* validate parameters */
 148         if (init->initiate_tag == 0) {
 149                 /* protocol error... send abort */
 150                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 151                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err);
 152                 return;
 153         }
 154         if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
 155                 /* invalid parameter... send abort */
 156                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 157                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err);
 158                 return;
 159         }
 160         if (init->num_inbound_streams == 0) {
 161                 /* protocol error... send abort */
 162                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 163                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err);
 164                 return;
 165         }
 166         if (init->num_outbound_streams == 0) {
 167                 /* protocol error... send abort */
 168                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 169                 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err);
 170                 return;
 171         }
 172
 173         /* send an INIT-ACK w/cookie */
 174 #ifdef SCTP_DEBUG
 175         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
 176                 kprintf("sctp_handle_init: sending INIT-ACK\n");
 177         }
 178 #endif
 179
 180         sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp);
 181 }
 182
 183 /*
 184  * process peer "INIT/INIT-ACK" chunk
 185  * returns value < 0 on error
 186  */
 187
 188 static int
 189 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb,
 190     struct sctp_nets *net)
 191 {
 192         struct sctp_init *init;
 193         struct sctp_association *asoc;
 194         struct sctp_nets *lnet;
 195         unsigned int i;
 196
 197         init = &cp->init;
 198         asoc = &stcb->asoc;
 199         /* save off parameters */
 200         asoc->peer_vtag = ntohl(init->initiate_tag);
 201         asoc->peers_rwnd = ntohl(init->a_rwnd);
 202
 203         if (TAILQ_FIRST(&asoc->nets)) {
 204                 /* update any ssthresh's that may have a default */
 205                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 206                         lnet->ssthresh = asoc->peers_rwnd;
 207                 }
 208         }
 209         if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
 210                 unsigned int newcnt;
 211                 struct sctp_stream_out *outs;
 212                 struct sctp_tmit_chunk *chk;
 213
 214                 /* cut back on number of streams */
 215                 newcnt = ntohs(init->num_inbound_streams);
 216                 /* This if is probably not needed but I am cautious */
 217                 if (asoc->strmout) {
 218                         /* First make sure no data chunks are trapped */
 219                         for (i=newcnt; i < asoc->pre_open_streams; i++) {
 220                                 outs = &asoc->strmout[i];
 221                                 chk = TAILQ_FIRST(&outs->outqueue);
 222                                 while (chk) {
 223                                         TAILQ_REMOVE(&outs->outqueue, chk,
 224                                                      sctp_next);
 225                                         asoc->stream_queue_cnt--;
 226                                         sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL,
 227                                             stcb, SCTP_NOTIFY_DATAGRAM_UNSENT,
 228                                             chk);
 229                                         if (chk->data) {
 230                                                 sctp_m_freem(chk->data);
 231                                                 chk->data = NULL;
 232                                         }
 233                                         sctp_free_remote_addr(chk->whoTo);
 234                                         chk->whoTo = NULL;
 235                                         chk->asoc = NULL;
 236                                         /* Free the chunk */
 237                                         SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
 238                                         sctppcbinfo.ipi_count_chunk--;
 239                                         if ((int)sctppcbinfo.ipi_count_chunk < 0) {
 240                                                 panic("Chunk count is negative");
 241                                         }
 242                                         sctppcbinfo.ipi_gencnt_chunk++;
 243                                         chk = TAILQ_FIRST(&outs->outqueue);
 244                                 }
 245                         }
 246                 }
 247                 /* cut back the count and abandon the upper streams */
 248                 asoc->pre_open_streams = newcnt;
 249         }
 250         asoc->streamincnt = ntohs(init->num_outbound_streams);
 251         if (asoc->streamincnt > MAX_SCTP_STREAMS) {
 252                 asoc->streamincnt = MAX_SCTP_STREAMS;
 253         }
 254
 255         asoc->streamoutcnt = asoc->pre_open_streams;
 256         /* init tsn's */
 257         asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
 258 #ifdef SCTP_MAP_LOGGING
 259         sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
 260 #endif
 261         /* This is the next one we expect */
 262         asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
 263
 264         asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
 265         asoc->cumulative_tsn = asoc->asconf_seq_in;
 266         asoc->last_echo_tsn = asoc->asconf_seq_in;
 267         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
 268         /* open the requested streams */
 269         if (asoc->strmin != NULL) {
 270                 /* Free the old ones */
 271                 FREE(asoc->strmin, M_PCB);
 272         }
 273         MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
 274                sizeof(struct sctp_stream_in), M_PCB, M_NOWAIT);
 275         if (asoc->strmin == NULL) {
 276                 /* we didn't get memory for the streams! */
 277 #ifdef SCTP_DEBUG
 278                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 279                         kprintf("process_init: couldn't get memory for the streams!\n");
 280                 }
 281 #endif
 282                 return (-1);
 283         }
 284         for (i = 0; i < asoc->streamincnt; i++) {
 285                 asoc->strmin[i].stream_no = i;
 286                 asoc->strmin[i].last_sequence_delivered = 0xffff;
 287                 /*
 288                  * U-stream ranges will be set when the cookie
 289                  * is unpacked. Or for the INIT sender they
 290                  * are un set (if pr-sctp not supported) when the
 291                  * INIT-ACK arrives.
 292                  */
 293                 TAILQ_INIT(&asoc->strmin[i].inqueue);
 294                 /*
 295                  * we are not on any wheel, pr-sctp streams
 296                  * will go on the wheel when they have data waiting
 297                  * for reorder.
 298                  */
 299                 asoc->strmin[i].next_spoke.tqe_next = 0;
 300                 asoc->strmin[i].next_spoke.tqe_prev = 0;
 301         }
 302
 303         /*
 304          * load_address_from_init will put the addresses into the
 305          * association when the COOKIE is processed or the INIT-ACK
 306          * is processed. Both types of COOKIE's existing and new
 307          * call this routine. It will remove addresses that
 308          * are no longer in the association (for the restarting
 309          * case where addresses are removed). Up front when the
 310          * INIT arrives we will discard it if it is a restart
 311          * and new addresses have been added.
 312          */
 313         return (0);
 314 }
 315
 316 /*
 317  * INIT-ACK message processing/consumption
 318  * returns value < 0 on error
 319  */
 320 static int
 321 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
 322     struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 323     struct sctp_nets *net)
 324 {
 325         struct sctp_association *asoc;
 326         struct mbuf *op_err;
 327         int retval, abort_flag;
 328         uint32_t initack_limit;
 329         /* First verify that we have no illegal param's */
 330         abort_flag = 0;
 331         op_err = NULL;
 332
 333         op_err = sctp_arethere_unrecognized_parameters(m,
 334             (offset+sizeof(struct sctp_init_chunk)) ,
 335             &abort_flag, (struct sctp_chunkhdr *)cp);
 336         if (abort_flag) {
 337                 /* Send an abort and notify peer */
 338                 if (op_err != NULL) {
 339                         sctp_send_operr_to(m, iphlen, op_err, cp->init.initiate_tag);
 340                 } else {
 341                         /*
 342                          * Just notify (abort_assoc does this if
 343                          * we send an abort).
 344                          */
 345                         sctp_abort_notification(stcb, 0);
 346                         /*
 347                          * No sense in further INIT's since
 348                          * we will get the same param back
 349                          */
 350                         sctp_free_assoc(stcb->sctp_ep, stcb);
 351                 }
 352                 return (-1);
 353         }
 354         asoc = &stcb->asoc;
 355         /* process the peer's parameters in the INIT-ACK */
 356         retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net);
 357         if (retval < 0) {
 358                 return (retval);
 359         }
 360
 361         initack_limit = offset + ntohs(cp->ch.chunk_length);
 362         /* load all addresses */
 363         if (sctp_load_addresses_from_init(stcb, m, iphlen,
 364             (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh,
 365             NULL)) {
 366                 /* Huh, we should abort */
 367                 sctp_abort_notification(stcb, 0);
 368                 sctp_free_assoc(stcb->sctp_ep, stcb);
 369                 return (-1);
 370         }
 371         if (op_err) {
 372                 sctp_queue_op_err(stcb, op_err);
 373                 /* queuing will steal away the mbuf chain to the out queue */
 374                 op_err = NULL;
 375         }
 376         /* extract the cookie and queue it to "echo" it back... */
 377         stcb->asoc.overall_error_count = 0;
 378         net->error_count = 0;
 379         retval = sctp_send_cookie_echo(m, offset, stcb, net);
 380         if (retval < 0) {
 381                 /*
 382                  * No cookie, we probably should send a op error.
 383                  * But in any case if there is no cookie in the INIT-ACK,
 384                  * we can abandon the peer, its broke.
 385                  */
 386                 if (retval == -3) {
 387                         /* We abort with an error of missing mandatory param */
 388                         struct mbuf *op_err;
 389                         op_err =
 390                             sctp_generate_invmanparam(SCTP_CAUSE_MISS_PARAM);
 391                         if (op_err) {
 392                                 /*
 393                                  * Expand beyond to include the mandatory
 394                                  * param cookie
 395                                  */
 396                                 struct sctp_inv_mandatory_param *mp;
 397                                 op_err->m_len =
 398                                     sizeof(struct sctp_inv_mandatory_param);
 399                                 mp = mtod(op_err,
 400                                     struct sctp_inv_mandatory_param *);
 401                                 /* Subtract the reserved param */
 402                                 mp->length =
 403                                     htons(sizeof(struct sctp_inv_mandatory_param) - 2);
 404                                 mp->num_param = htonl(1);
 405                                 mp->param = htons(SCTP_STATE_COOKIE);
 406                                 mp->resv = 0;
 407                         }
 408                         sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
 409                             sh, op_err);
 410                 }
 411                 return (retval);
 412         }
 413
 414         /*
 415          * Cancel the INIT timer, We do this first before queueing
 416          * the cookie. We always cancel at the primary to assue that
 417          * we are canceling the timer started by the INIT which always
 418          * goes to the primary.
 419          */
 420         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
 421             asoc->primary_destination);
 422
 423         /* calculate the RTO */
 424         net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered);
 425
 426         return (0);
 427 }
 428
 429 static void
 430 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
 431     struct sctp_tcb *stcb, struct sctp_nets *net)
 432 {
 433         struct sockaddr_storage store;
 434         struct sockaddr_in *sin;
 435         struct sockaddr_in6 *sin6;
 436         struct sctp_nets *r_net;
 437         struct timeval tv;
 438
 439         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
 440                 /* Invalid length */
 441                 return;
 442         }
 443
 444         sin = (struct sockaddr_in *)&store;
 445         sin6 = (struct sockaddr_in6 *)&store;
 446
 447         memset(&store, 0, sizeof(store));
 448         if (cp->heartbeat.hb_info.addr_family == AF_INET &&
 449             cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
 450                 sin->sin_family = cp->heartbeat.hb_info.addr_family;
 451                 sin->sin_len = cp->heartbeat.hb_info.addr_len;
 452                 sin->sin_port = stcb->rport;
 453                 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address,
 454                     sizeof(sin->sin_addr));
 455         } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 &&
 456             cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
 457                 sin6->sin6_family = cp->heartbeat.hb_info.addr_family;
 458                 sin6->sin6_len = cp->heartbeat.hb_info.addr_len;
 459                 sin6->sin6_port = stcb->rport;
 460                 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address,
 461                     sizeof(sin6->sin6_addr));
 462         } else {
 463 #ifdef SCTP_DEBUG
 464                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
 465                         kprintf("unsupported address family");
 466                 }
 467 #endif
 468                 return;
 469         }
 470         r_net = sctp_findnet(stcb, (struct sockaddr *)sin);
 471         if (r_net == NULL) {
 472 #ifdef SCTP_DEBUG
 473                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
 474                         kprintf("Huh? I can't find the address I sent it to, discard\n");
 475                 }
 476 #endif
 477                 return;
 478         }
 479         if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
 480             (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
 481             (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
 482                 /*
 483                  * If the its a HB and it's random value is correct when
 484                  * can confirm the destination.
 485                  */
 486                 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 487                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 488                     stcb, 0, (void *)r_net);
 489         }
 490         r_net->error_count = 0;
 491         r_net->hb_responded = 1;
 492         tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
 493         tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
 494         if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) {
 495                 r_net->dest_state = SCTP_ADDR_REACHABLE;
 496                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
 497                     SCTP_HEARTBEAT_SUCCESS, (void *)r_net);
 498
 499                 /* now was it the primary? if so restore */
 500                 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) {
 501                         sctp_set_primary_addr(stcb, NULL, r_net);
 502                 }
 503         }
 504         /* Now lets do a RTO with this */
 505         r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv);
 506 }
 507
 508 static void
 509 sctp_handle_abort(struct sctp_abort_chunk *cp,
 510     struct sctp_tcb *stcb, struct sctp_nets *net)
 511 {
 512         struct sctp_inpcb *inp;
 513
 514 #ifdef SCTP_DEBUG
 515         if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 516                 kprintf("sctp_handle_abort: handling ABORT\n");
 517         }
 518 #endif
 519         if (stcb == NULL)
 520                 return;
 521         /* verify that the destination addr is in the association */
 522         /* ignore abort for addresses being deleted */
 523
 524         /* stop any receive timers */
 525         sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net);
 526         /* notify user of the abort and clean up... */
 527         sctp_abort_notification(stcb, 0);
 528         /* free the tcb */
 529         inp = stcb->sctp_ep;
 530         sctp_free_assoc(stcb->sctp_ep, stcb);
 531 #ifdef SCTP_DEBUG
 532         if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 533                 kprintf("sctp_handle_abort: finished\n");
 534         }
 535 #endif
 536 }
 537
 538 static void
 539 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
 540     struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
 541 {
 542         struct sctp_association *asoc;
 543         int some_on_streamwheel;
 544
 545 #ifdef SCTP_DEBUG
 546         if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 547                 kprintf("sctp_handle_shutdown: handling SHUTDOWN\n");
 548         }
 549 #endif
 550         if (stcb == NULL)
 551                 return;
 552
 553         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) ||
 554             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
 555             return;
 556         }
 557
 558         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
 559                 /* update current data status */
 560 #ifdef SCTP_DEBUG
 561                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
 562                         kprintf("Warning Shutdown NOT the expected size.. skipping (%d:%d)\n",
 563                                ntohs(cp->ch.chunk_length),
 564                                (int)sizeof(struct sctp_shutdown_chunk));
 565                 }
 566 #endif
 567                 return;
 568         } else {
 569                 sctp_update_acked(stcb, cp, net, abort_flag);
 570         }
 571         asoc = &stcb->asoc;
 572         /* goto SHUTDOWN_RECEIVED state to block new requests */
 573         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 574             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
 575                 asoc->state = SCTP_STATE_SHUTDOWN_RECEIVED;
 576 #ifdef SCTP_DEBUG
 577                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
 578                         kprintf("Moving to SHUTDOWN-RECEIVED state\n");
 579                 }
 580 #endif
 581                 /* notify upper layer that peer has initiated a shutdown */
 582                 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL);
 583
 584                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 585                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 586
 587                         /* Set the flag so we cannot send more, we
 588                          * would call the function but we don't want to
 589                          * wake up the ulp necessarily.
 590                          */
 591 #if defined(__FreeBSD__) && __FreeBSD_version >= 502115
 592                         stcb->sctp_ep->sctp_socket->so_rcv.sb_state |= SBS_CANTSENDMORE;
 593 #else
 594                         sosetstate(stcb->sctp_ep->sctp_socket, SS_CANTSENDMORE);
 595 #endif
 596                 }
 597                 /* reset time */
 598                 SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
 599         }
 600         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
 601                 /*
 602                  * stop the shutdown timer, since we WILL move
 603                  * to SHUTDOWN-ACK-SENT.
 604                  */
 605                 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net);
 606         }
 607         /* Now are we there yet? */
 608         some_on_streamwheel = 0;
 609         if (!TAILQ_EMPTY(&asoc->out_wheel)) {
 610                 /* Check to see if some data queued */
 611                 struct sctp_stream_out *outs;
 612                 TAILQ_FOREACH(outs, &asoc->out_wheel, next_spoke) {
 613                         if (!TAILQ_EMPTY(&outs->outqueue)) {
 614                                 some_on_streamwheel = 1;
 615                                 break;
 616                         }
 617                 }
 618         }
 619 #ifdef SCTP_DEBUG
 620         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
 621                 kprintf("some_on_streamwheel:%d send_q_empty:%d sent_q_empty:%d\n",
 622                        some_on_streamwheel,
 623                        !TAILQ_EMPTY(&asoc->send_queue),
 624                        !TAILQ_EMPTY(&asoc->sent_queue));
 625         }
 626 #endif
 627         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 628             !TAILQ_EMPTY(&asoc->sent_queue) ||
 629             some_on_streamwheel) {
 630                 /* By returning we will push more data out */
 631                 return;
 632         } else {
 633                 /* no outstanding data to send, so move on... */
 634                 /* send SHUTDOWN-ACK */
 635                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
 636                 /* move to SHUTDOWN-ACK-SENT state */
 637                 asoc->state = SCTP_STATE_SHUTDOWN_ACK_SENT;
 638 #ifdef SCTP_DEBUG
 639                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
 640                         kprintf("moving to SHUTDOWN_ACK state\n");
 641                 }
 642 #endif
 643                 /* start SHUTDOWN timer */
 644                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep,
 645                     stcb, net);
 646         }
 647 }
 648
 649 static void
 650 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp,
 651     struct sctp_tcb *stcb, struct sctp_nets *net)
 652 {
 653         struct sctp_association *asoc;
 654
 655 #ifdef SCTP_DEBUG
 656         if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 657                 kprintf("sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
 658         }
 659 #endif
 660         if (stcb == NULL)
 661                 return;
 662
 663         asoc = &stcb->asoc;
 664         /* process according to association state */
 665         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 666             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 667                 /* unexpected SHUTDOWN-ACK... so ignore... */
 668                 return;
 669         }
 670         /* are the queues empty? */
 671         if (!TAILQ_EMPTY(&asoc->send_queue) ||
 672             !TAILQ_EMPTY(&asoc->sent_queue) ||
 673             !TAILQ_EMPTY(&asoc->out_wheel)) {
 674                 sctp_report_all_outbound(stcb);
 675         }
 676         /* stop the timer */
 677         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net);
 678         /* send SHUTDOWN-COMPLETE */
 679         sctp_send_shutdown_complete(stcb, net);
 680         /* notify upper layer protocol */
 681         sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL);
 682         if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 683             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
 684                 stcb->sctp_ep->sctp_flags &= ~SCTP_PCB_FLAGS_CONNECTED;
 685                 /* Set the connected flag to disconnected */
 686                 stcb->sctp_ep->sctp_socket->so_snd.ssb_cc = 0;
 687                 stcb->sctp_ep->sctp_socket->so_snd.ssb_mbcnt = 0;
 688                 soisdisconnected(stcb->sctp_ep->sctp_socket);
 689         }
 690         /* free the TCB but first save off the ep */
 691         sctp_free_assoc(stcb->sctp_ep, stcb);
 692 }
 693
 694 /*
 695  * Skip past the param header and then we will find the chunk that
 696  * caused the problem. There are two possiblities ASCONF or FWD-TSN
 697  * other than that and our peer must be broken.
 698  */
 699 static void
 700 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
 701     struct sctp_nets *net)
 702 {
 703         struct sctp_chunkhdr *chk;
 704
 705         chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
 706         switch (chk->chunk_type) {
 707         case SCTP_ASCONF_ACK:
 708 #ifdef SCTP_DEBUG
 709                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 710                         kprintf("Strange peer, snds ASCONF but does not recognize asconf-ack?\n");
 711                 }
 712 #endif
 713         case SCTP_ASCONF:
 714 #ifdef SCTP_DEBUG
 715                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 716                         kprintf("Peer does not support ASCONF/ASCONF-ACK chunks\n");
 717                 }
 718 #endif /* SCTP_DEBUG */
 719                 sctp_asconf_cleanup(stcb, net);
 720                 break;
 721         case SCTP_FORWARD_CUM_TSN:
 722                 stcb->asoc.peer_supports_prsctp = 0;
 723                 break;
 724         default:
 725 #ifdef SCTP_DEBUG
 726                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 727                         kprintf("Peer does not support chunk type %d(%x)??\n",
 728                                chk->chunk_type, (u_int)chk->chunk_type);
 729                 }
 730 #endif
 731                 break;
 732         }
 733 }
 734
 735 /*
 736  * Skip past the param header and then we will find the param that
 737  * caused the problem.  There are a number of param's in a ASCONF
 738  * OR the prsctp param these will turn of specific features.
 739  */
 740 static void
 741 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
 742 {
 743         struct sctp_paramhdr *pbad;
 744
 745         pbad = phdr + 1;
 746         switch (ntohs(pbad->param_type)) {
 747                 /* pr-sctp draft */
 748         case SCTP_PRSCTP_SUPPORTED:
 749                 stcb->asoc.peer_supports_prsctp = 0;
 750                 break;
 751         case SCTP_SUPPORTED_CHUNK_EXT:
 752                 break;
 753                 /* draft-ietf-tsvwg-addip-sctp */
 754         case SCTP_ECN_NONCE_SUPPORTED:
 755                 stcb->asoc.peer_supports_ecn_nonce = 0;
 756                 stcb->asoc.ecn_nonce_allowed = 0;
 757                 stcb->asoc.ecn_allowed = 0;
 758                 break;
 759         case SCTP_ADD_IP_ADDRESS:
 760         case SCTP_DEL_IP_ADDRESS:
 761                 stcb->asoc.peer_supports_asconf = 0;
 762                 break;
 763         case SCTP_SET_PRIM_ADDR:
 764                 stcb->asoc.peer_supports_asconf_setprim = 0;
 765                 break;
 766         case SCTP_SUCCESS_REPORT:
 767         case SCTP_ERROR_CAUSE_IND:
 768 #ifdef SCTP_DEBUG
 769                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 770                         kprintf("Huh, the peer does not support success? or error cause?\n");
 771                         kprintf("Turning off ASCONF to this strange peer\n");
 772                 }
 773 #endif
 774                 stcb->asoc.peer_supports_asconf = 0;
 775                 stcb->asoc.peer_supports_asconf_setprim = 0;
 776                 break;
 777         default:
 778 #ifdef SCTP_DEBUG
 779                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 780                         kprintf("Peer does not support base param type %d(%x)??\n",
 781                             pbad->param_type, (u_int)pbad->param_type);
 782                 }
 783 #endif
 784                 break;
 785         }
 786 }
 787
 788 static int
 789 sctp_handle_error(struct sctp_chunkhdr *ch,
 790     struct sctp_tcb *stcb, struct sctp_nets *net)
 791 {
 792         int chklen;
 793         struct sctp_paramhdr *phdr;
 794         uint16_t error_type;
 795         uint16_t error_len;
 796         struct sctp_association *asoc;
 797
 798         int adjust;
 799         /* parse through all of the errors and process */
 800         asoc = &stcb->asoc;
 801         phdr = (struct sctp_paramhdr *)((caddr_t)ch +
 802             sizeof(struct sctp_chunkhdr));
 803         chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
 804         while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
 805                 /* Process an Error Cause */
 806                 error_type = ntohs(phdr->param_type);
 807                 error_len = ntohs(phdr->param_length);
 808                 if ((error_len > chklen) || (error_len == 0)) {
 809                         /* invalid param length for this param */
 810 #ifdef SCTP_DEBUG
 811                         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
 812                                 kprintf("Bogus length in error param- chunk left:%d errorlen:%d\n",
 813                                        chklen, error_len);
 814                         }
 815 #endif /* SCTP_DEBUG */
 816                         return (0);
 817                 }
 818                 switch (error_type) {
 819                 case SCTP_CAUSE_INV_STRM:
 820                 case SCTP_CAUSE_MISS_PARAM:
 821                 case SCTP_CAUSE_INVALID_PARAM:
 822                 case SCTP_CAUSE_NOUSER_DATA:
 823 #ifdef SCTP_DEBUG
 824                         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
 825                                 kprintf("Software error we got a %d back? We have a bug :/ (or do they?)\n",
 826                                        error_type);
 827                         }
 828 #endif
 829                         break;
 830                 case SCTP_CAUSE_STALE_COOKIE:
 831                         /* We only act if we have echoed a cookie and are waiting. */
 832                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
 833                                 int *p;
 834                                 p = (int *)((caddr_t)phdr + sizeof(*phdr));
 835                                 /* Save the time doubled */
 836                                 asoc->cookie_preserve_req = ntohl(*p) << 1;
 837                                 asoc->stale_cookie_count++;
 838                                 if (asoc->stale_cookie_count >
 839                                     asoc->max_init_times) {
 840                                         sctp_abort_notification(stcb, 0);
 841                                         /* now free the asoc */
 842                                         sctp_free_assoc(stcb->sctp_ep, stcb);
 843                                         return (-1);
 844                                 }
 845                                 /* blast back to INIT state */
 846                                 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
 847                                 asoc->state |= SCTP_STATE_COOKIE_WAIT;
 848                                 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
 849                                     stcb->sctp_ep, stcb, net);
 850                                 sctp_send_initiate(stcb->sctp_ep, stcb);
 851                         }
 852                         break;
 853                 case SCTP_CAUSE_UNRESOLV_ADDR:
 854                         /*
 855                          * Nothing we can do here, we don't do hostname
 856                          * addresses so if the peer does not like my IPv6 (or
 857                          * IPv4 for that matter) it does not matter. If they
 858                          * don't support that type of address, they can NOT
 859                          * possibly get that packet type... i.e. with no IPv6
 860                          * you can't recieve a IPv6 packet. so we can safely
 861                          * ignore this one. If we ever added support for
 862                          * HOSTNAME Addresses, then we would need to do
 863                          * something here.
 864                          */
 865                         break;
 866                 case SCTP_CAUSE_UNRECOG_CHUNK:
 867                         sctp_process_unrecog_chunk(stcb, phdr, net);
 868                         break;
 869                 case SCTP_CAUSE_UNRECOG_PARAM:
 870                         sctp_process_unrecog_param(stcb, phdr);
 871                         break;
 872                 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
 873                         /*
 874                          * We ignore this since the timer will drive out a new
 875                          * cookie anyway and there timer will drive us to send
 876                          * a SHUTDOWN_COMPLETE. We can't send one here since
 877                          * we don't have their tag.
 878                          */
 879                         break;
 880                 case SCTP_CAUSE_DELETEING_LAST_ADDR:
 881                 case SCTP_CAUSE_OPERATION_REFUSED:
 882                 case SCTP_CAUSE_DELETING_SRC_ADDR:
 883                         /* We should NOT get these here, but in a ASCONF-ACK. */
 884 #ifdef SCTP_DEBUG
 885                         if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 886                                 kprintf("Peer sends ASCONF errors in a Operational Error?<%d>?\n",
 887                                        error_type);
 888                         }
 889 #endif
 890                         break;
 891                 case SCTP_CAUSE_OUT_OF_RESC:
 892                         /*
 893                          * And what, pray tell do we do with the fact
 894                          * that the peer is out of resources? Not
 895                          * really sure we could do anything but abort.
 896                          * I suspect this should have came WITH an
 897                          * abort instead of in a OP-ERROR.
 898                          */
 899                         break;
 900                 default:
 901 #ifdef SCTP_DEBUG
 902                         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
 903                                 /* don't know what this error cause is... */
 904                                 kprintf("sctp_handle_error: unknown error type = 0x%xh\n",
 905                                        error_type);
 906                         }
 907 #endif /* SCTP_DEBUG */
 908                         break;
 909                 }
 910                 adjust = SCTP_SIZE32(error_len);
 911                 chklen -= adjust;
 912                 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
 913         }
 914         return (0);
 915 }
 916
 917 static int
 918 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
 919     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
 920     struct sctp_nets *net)
 921 {
 922         struct sctp_init_ack *init_ack;
 923         int *state;
 924         struct mbuf *op_err;
 925
 926 #ifdef SCTP_DEBUG
 927         if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 928                 kprintf("sctp_handle_init_ack: handling INIT-ACK\n");
 929         }
 930 #endif
 931         if (stcb == NULL) {
 932 #ifdef SCTP_DEBUG
 933                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
 934                         kprintf("sctp_handle_init_ack: TCB is null\n");
 935                 }
 936 #endif
 937                 return (-1);
 938         }
 939         if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
 940                 /* Invalid length */
 941                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 942                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 943                     op_err);
 944                 return (-1);
 945         }
 946         init_ack = &cp->init;
 947         /* validate parameters */
 948         if (init_ack->initiate_tag == 0) {
 949                 /* protocol error... send an abort */
 950                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 951                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 952                     op_err);
 953                 return (-1);
 954         }
 955         if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
 956                 /* protocol error... send an abort */
 957                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 958                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 959                     op_err);
 960                 return (-1);
 961         }
 962         if (init_ack->num_inbound_streams == 0) {
 963                 /* protocol error... send an abort */
 964                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 965                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 966                     op_err);
 967                 return (-1);
 968         }
 969         if (init_ack->num_outbound_streams == 0) {
 970                 /* protocol error... send an abort */
 971                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM);
 972                 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh,
 973                     op_err);
 974                 return (-1);
 975         }
 976
 977         /* process according to association state... */
 978         state = &stcb->asoc.state;
 979         switch (*state & SCTP_STATE_MASK) {
 980         case SCTP_STATE_COOKIE_WAIT:
 981                 /* this is the expected state for this chunk */
 982                 /* process the INIT-ACK parameters */
 983                 if (stcb->asoc.primary_destination->dest_state &
 984                     SCTP_ADDR_UNCONFIRMED) {
 985                         /*
 986                          * The primary is where we sent the INIT, we can
 987                          * always consider it confirmed when the INIT-ACK
 988                          * is returned. Do this before we load addresses
 989                          * though.
 990                          */
 991                         stcb->asoc.primary_destination->dest_state &=
 992                             ~SCTP_ADDR_UNCONFIRMED;
 993                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
 994                             stcb, 0, (void *)stcb->asoc.primary_destination);
 995                 }
 996                 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, net
 997                     ) < 0) {
 998                         /* error in parsing parameters */
 999 #ifdef SCTP_DEBUG
1000                         if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1001                                 kprintf("sctp_process_init_ack: error in msg, discarding\n");
1002                         }
1003 #endif
1004                         return (-1);
1005                 }
1006                 /* update our state */
1007 #ifdef SCTP_DEBUG
1008                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1009                         kprintf("moving to COOKIE-ECHOED state\n");
1010                 }
1011 #endif
1012                 if (*state & SCTP_STATE_SHUTDOWN_PENDING) {
1013                         *state = SCTP_STATE_COOKIE_ECHOED |
1014                                 SCTP_STATE_SHUTDOWN_PENDING;
1015                 } else {
1016                         *state = SCTP_STATE_COOKIE_ECHOED;
1017                 }
1018
1019                 /* reset the RTO calc */
1020                 stcb->asoc.overall_error_count = 0;
1021                 SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1022                 /*
1023                  * collapse the init timer back in case of a exponential backoff
1024                  */
1025                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
1026                     stcb, net);
1027                 /*
1028                  * the send at the end of the inbound data processing will
1029                  * cause the cookie to be sent
1030                  */
1031                 break;
1032         case SCTP_STATE_SHUTDOWN_SENT:
1033                 /* incorrect state... discard */
1034                 break;
1035         case SCTP_STATE_COOKIE_ECHOED:
1036                 /* incorrect state... discard */
1037                 break;
1038         case SCTP_STATE_OPEN:
1039                 /* incorrect state... discard */
1040                 break;
1041         case SCTP_STATE_EMPTY:
1042         case SCTP_STATE_INUSE:
1043         default:
1044                 /* incorrect state... discard */
1045 #ifdef SCTP_DEBUG
1046                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1047                         kprintf("Leaving handle-init-ack default\n");
1048                 }
1049 #endif
1050                 return (-1);
1051                 break;
1052         } /* end switch asoc state */
1053 #ifdef SCTP_DEBUG
1054         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1055                 kprintf("Leaving handle-init-ack end\n");
1056         }
1057 #endif
1058         return (0);
1059 }
1060
1061
1062 /*
1063  * handle a state cookie for an existing association
1064  * m: input packet mbuf chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk
1065  *    note: this is a "split" mbuf and the cookie signature does not exist
1066  * offset: offset into mbuf to the cookie-echo chunk
1067  */
1068 static struct sctp_tcb *
1069 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
1070     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1071     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
1072     struct sockaddr *init_src, int *notification)
1073 {
1074         struct sctp_association *asoc;
1075         struct sctp_init_chunk *init_cp, init_buf;
1076         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1077         int chk_length;
1078         int init_offset, initack_offset;
1079         int retval;
1080
1081         /* I know that the TCB is non-NULL from the caller */
1082         asoc = &stcb->asoc;
1083
1084         if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
1085                 /* SHUTDOWN came in after sending INIT-ACK */
1086                 struct mbuf *op_err;
1087                 struct sctp_paramhdr *ph;
1088
1089                 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
1090 #ifdef SCTP_DEBUG
1091                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1092                         kprintf("sctp_handle_cookie: got a cookie, while shutting down!\n");
1093                 }
1094 #endif
1095                 MGETHDR(op_err, MB_DONTWAIT, MT_HEADER);
1096                 if (op_err == NULL) {
1097                         /* FOOBAR */
1098                         return (NULL);
1099                 }
1100                 /* pre-reserve some space */
1101                 op_err->m_data += sizeof(struct ip6_hdr);
1102                 op_err->m_data += sizeof(struct sctphdr);
1103                 op_err->m_data += sizeof(struct sctp_chunkhdr);
1104                 /* Set the len */
1105                 op_err->m_len = op_err->m_pkthdr.len = sizeof(struct sctp_paramhdr);
1106                 ph = mtod(op_err, struct sctp_paramhdr *);
1107                 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN);
1108                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
1109                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag);
1110                 return (NULL);
1111         }
1112         /*
1113          * find and validate the INIT chunk in the cookie (peer's info)
1114          * the INIT should start after the cookie-echo header struct
1115          * (chunk header, state cookie header struct)
1116          */
1117         init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
1118
1119         init_cp = (struct sctp_init_chunk *)
1120             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1121             (u_int8_t *)&init_buf);
1122         if (init_cp == NULL) {
1123                 /* could not pull a INIT chunk in cookie */
1124 #ifdef SCTP_DEBUG
1125                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1126                         kprintf("process_cookie_existing: could not pull INIT chunk hdr\n");
1127                 }
1128 #endif /* SCTP_DEBUG */
1129                 return (NULL);
1130         }
1131         chk_length = ntohs(init_cp->ch.chunk_length);
1132         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1133 #ifdef SCTP_DEBUG
1134                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1135                         kprintf("process_cookie_existing: could not find INIT chunk!\n");
1136                 }
1137 #endif /* SCTP_DEBUG */
1138                 return (NULL);
1139         }
1140
1141         /*
1142          * find and validate the INIT-ACK chunk in the cookie (my info)
1143          * the INIT-ACK follows the INIT chunk
1144          */
1145         initack_offset = init_offset + SCTP_SIZE32(chk_length);
1146         initack_cp = (struct sctp_init_ack_chunk *)
1147             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1148             (u_int8_t *)&initack_buf);
1149         if (initack_cp == NULL) {
1150                 /* could not pull INIT-ACK chunk in cookie */
1151 #ifdef SCTP_DEBUG
1152                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1153                         kprintf("process_cookie_existing: could not pull INIT-ACK chunk hdr\n");
1154                 }
1155 #endif /* SCTP_DEBUG */
1156                 return (NULL);
1157         }
1158         chk_length = ntohs(initack_cp->ch.chunk_length);
1159         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1160 #ifdef SCTP_DEBUG
1161                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1162                         kprintf("process_cookie_existing: could not find INIT-ACK chunk!\n");
1163                 }
1164 #endif /* SCTP_DEBUG */
1165                 return (NULL);
1166         }
1167         if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
1168             (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
1169                 /*
1170                  * case D in Section 5.2.4 Table 2: MMAA
1171                  * process accordingly to get into the OPEN state
1172                  */
1173                 switch SCTP_GET_STATE(asoc) {
1174                 case SCTP_STATE_COOKIE_WAIT:
1175                         /*
1176                          * INIT was sent, but got got a COOKIE_ECHO with
1177                          * the correct tags... just accept it...
1178                          */
1179                         /* First we must process the INIT !! */
1180                         retval = sctp_process_init(init_cp, stcb, net);
1181                         if (retval < 0) {
1182 #ifdef SCTP_DEBUG
1183                                 kprintf("process_cookie_existing: INIT processing failed\n");
1184 #endif
1185                                 return (NULL);
1186                         }
1187                         /* intentional fall through to below... */
1188
1189                 case SCTP_STATE_COOKIE_ECHOED:
1190                         /* Duplicate INIT case */
1191                         /* we have already processed the INIT so no problem */
1192                         sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1193                             net);
1194                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
1195                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, inp, stcb,
1196                             net);
1197                         /* update current state */
1198                         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1199                                 asoc->state = SCTP_STATE_OPEN |
1200                                     SCTP_STATE_SHUTDOWN_PENDING;
1201                         } else if ((asoc->state & SCTP_STATE_SHUTDOWN_SENT) == 0) {
1202                                 /* if ok, move to OPEN state */
1203                                 asoc->state = SCTP_STATE_OPEN;
1204                         }
1205                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1206                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1207                             (!(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_ACCEPTING))) {
1208                                 /*
1209                                  * Here is where collision would go if we did a
1210                                  * connect() and instead got a
1211                                  * init/init-ack/cookie done before the
1212                                  * init-ack came back..
1213                                  */
1214                                 stcb->sctp_ep->sctp_flags |=
1215                                     SCTP_PCB_FLAGS_CONNECTED;
1216                                 soisconnected(stcb->sctp_ep->sctp_socket);
1217                         }
1218                         /* notify upper layer */
1219                         *notification = SCTP_NOTIFY_ASSOC_UP;
1220                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb,
1221                             net);
1222                         /*
1223                          * since we did not send a HB make sure we don't double
1224                          * things
1225                          */
1226                         net->hb_responded = 1;
1227
1228                         if (stcb->asoc.sctp_autoclose_ticks &&
1229                             (inp->sctp_flags & SCTP_PCB_FLAGS_AUTOCLOSE)) {
1230                                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
1231                                     inp, stcb, NULL);
1232                         }
1233                         break;
1234                 default:
1235                         /*
1236                          * we're in the OPEN state (or beyond), so peer
1237                          * must have simply lost the COOKIE-ACK
1238                          */
1239                         break;
1240                 } /* end switch */
1241
1242                 /*
1243                  * We ignore the return code here.. not sure if we should
1244                  * somehow abort.. but we do have an existing asoc. This
1245                  * really should not fail.
1246                  */
1247                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1248                     init_offset + sizeof(struct sctp_init_chunk),
1249                     initack_offset, sh, init_src)) {
1250 #ifdef SCTP_DEBUG
1251                         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1252                                 kprintf("Weird cookie load_address failure on cookie existing - 1\n");
1253                         }
1254 #endif
1255                         return (NULL);
1256                 }
1257
1258                 /* respond with a COOKIE-ACK */
1259                 sctp_send_cookie_ack(stcb);
1260                 return (stcb);
1261         } /* end if */
1262         if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1263             ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
1264             cookie->tie_tag_my_vtag == 0 &&
1265             cookie->tie_tag_peer_vtag == 0) {
1266                 /*
1267                  * case C in Section 5.2.4 Table 2: XMOO
1268                  * silently discard
1269                  */
1270                 return (NULL);
1271         }
1272         if (ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag &&
1273             (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag ||
1274              init_cp->init.initiate_tag == 0)) {
1275                 /*
1276                  * case B in Section 5.2.4 Table 2: MXAA or MOAA
1277                  * my info should be ok, re-accept peer info
1278                  */
1279                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net);
1280                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
1281                 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
1282                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net);
1283                 /*
1284                  * since we did not send a HB make sure we don't double things
1285                  */
1286                 net->hb_responded = 1;
1287                 if (stcb->asoc.sctp_autoclose_ticks &&
1288                     (inp->sctp_flags & SCTP_PCB_FLAGS_AUTOCLOSE)) {
1289                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
1290                             NULL);
1291                 }
1292                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1293                 asoc->pre_open_streams =
1294                     ntohs(initack_cp->init.num_outbound_streams);
1295                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1296                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out =
1297                     asoc->init_seq_number;
1298                 asoc->t3timeout_highest_marked = asoc->asconf_seq_out;
1299                 asoc->last_cwr_tsn = asoc->init_seq_number - 1;
1300                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1301                 asoc->str_reset_seq_in = asoc->init_seq_number;
1302                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1303
1304                 /* process the INIT info (peer's info) */
1305                 retval = sctp_process_init(init_cp, stcb, net);
1306                 if (retval < 0) {
1307 #ifdef SCTP_DEBUG
1308                         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1309                                 kprintf("process_cookie_existing: INIT processing failed\n");
1310                         }
1311 #endif
1312                         return (NULL);
1313                 }
1314                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1315                     init_offset + sizeof(struct sctp_init_chunk),
1316                     initack_offset, sh, init_src)) {
1317 #ifdef SCTP_DEBUG
1318                         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1319                                 kprintf("Weird cookie load_address failure on cookie existing - 2\n");
1320                         }
1321 #endif
1322                         return (NULL);
1323                 }
1324
1325                 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
1326                     (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
1327                         *notification = SCTP_NOTIFY_ASSOC_UP;
1328
1329                         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1330                              (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
1331                             !(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_ACCEPTING)) {
1332                                 stcb->sctp_ep->sctp_flags |=
1333                                     SCTP_PCB_FLAGS_CONNECTED;
1334                                 soisconnected(stcb->sctp_ep->sctp_socket);
1335                         }
1336                 }
1337                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1338                         asoc->state = SCTP_STATE_OPEN |
1339                             SCTP_STATE_SHUTDOWN_PENDING;
1340                 } else {
1341                         asoc->state = SCTP_STATE_OPEN;
1342                 }
1343                 sctp_send_cookie_ack(stcb);
1344                 return (stcb);
1345         }
1346
1347         if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
1348              ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
1349             cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
1350             cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
1351             cookie->tie_tag_peer_vtag != 0) {
1352                 /*
1353                  * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
1354                  */
1355                 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
1356                 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
1357                 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net);
1358
1359                 /* notify upper layer */
1360                 *notification = SCTP_NOTIFY_ASSOC_RESTART;
1361
1362                 /* send up all the data */
1363                 sctp_report_all_outbound(stcb);
1364
1365                 /* process the INIT-ACK info (my info) */
1366                 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1367                 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1368                 asoc->pre_open_streams =
1369                     ntohs(initack_cp->init.num_outbound_streams);
1370                 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1371                 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out =
1372                     asoc->init_seq_number;
1373                 asoc->t3timeout_highest_marked = asoc->asconf_seq_out;
1374                 asoc->last_cwr_tsn = asoc->init_seq_number - 1;
1375                 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1376                 asoc->str_reset_seq_in = asoc->init_seq_number;
1377
1378                 asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1379                 if (asoc->mapping_array)
1380                         memset(asoc->mapping_array, 0,
1381                             asoc->mapping_array_size);
1382                 /* process the INIT info (peer's info) */
1383                 retval = sctp_process_init(init_cp, stcb, net);
1384                 if (retval < 0) {
1385 #ifdef SCTP_DEBUG
1386                         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1387                                 kprintf("process_cookie_existing: INIT processing failed\n");
1388                         }
1389 #endif
1390                         return (NULL);
1391                 }
1392
1393                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net);
1394                 /*
1395                  * since we did not send a HB make sure we don't double things
1396                  */
1397                 net->hb_responded = 1;
1398
1399                 if (sctp_load_addresses_from_init(stcb, m, iphlen,
1400                     init_offset + sizeof(struct sctp_init_chunk),
1401                     initack_offset, sh, init_src)) {
1402 #ifdef SCTP_DEBUG
1403                         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1404                                 kprintf("Weird cookie load_address failure on cookie existing - 3\n");
1405                         }
1406 #endif
1407                         return (NULL);
1408                 }
1409
1410                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1411                         asoc->state = SCTP_STATE_OPEN |
1412                             SCTP_STATE_SHUTDOWN_PENDING;
1413                 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
1414                         /* move to OPEN state, if not in SHUTDOWN_SENT */
1415                         asoc->state = SCTP_STATE_OPEN;
1416                 }
1417                 /* respond with a COOKIE-ACK */
1418                 sctp_send_cookie_ack(stcb);
1419
1420                 return (stcb);
1421         }
1422         /* all other cases... */
1423         return (NULL);
1424 }
1425
1426 /*
1427  * handle a state cookie for a new association
1428  * m: input packet mbuf chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk
1429  *    note: this is a "split" mbuf and the cookie signature does not exist
1430  * offset: offset into mbuf to the cookie-echo chunk
1431  * length: length of the cookie chunk
1432  * to: where the init was from
1433  * returns a new TCB
1434  */
1435 static struct sctp_tcb *
1436 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
1437     struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
1438     struct sctp_inpcb *inp, struct sctp_nets **netp,
1439     struct sockaddr *init_src, int *notification)
1440 {
1441         struct sctp_tcb *stcb;
1442         struct sctp_init_chunk *init_cp, init_buf;
1443         struct sctp_init_ack_chunk *initack_cp, initack_buf;
1444         struct sockaddr_storage sa_store;
1445         struct sockaddr *initack_src = (struct sockaddr *)&sa_store;
1446         struct sockaddr_in *sin;
1447         struct sockaddr_in6 *sin6;
1448         struct sctp_association *asoc;
1449         int chk_length;
1450         int init_offset, initack_offset, initack_limit;
1451         int retval;
1452         int error = 0;
1453         u_int32_t old_tag;
1454         /*
1455          * find and validate the INIT chunk in the cookie (peer's info)
1456          * the INIT should start after the cookie-echo header struct
1457          * (chunk header, state cookie header struct)
1458          */
1459         init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
1460         init_cp = (struct sctp_init_chunk *)
1461             sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
1462             (u_int8_t *)&init_buf);
1463         if (init_cp == NULL) {
1464                 /* could not pull a INIT chunk in cookie */
1465 #ifdef SCTP_DEBUG
1466                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1467                         kprintf("process_cookie_new: could not pull INIT chunk hdr\n");
1468                 }
1469 #endif /* SCTP_DEBUG */
1470                 return (NULL);
1471         }
1472         chk_length = ntohs(init_cp->ch.chunk_length);
1473         if (init_cp->ch.chunk_type != SCTP_INITIATION) {
1474 #ifdef SCTP_DEBUG
1475                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1476                         kprintf("HUH? process_cookie_new: could not find INIT chunk!\n");
1477                 }
1478 #endif /* SCTP_DEBUG */
1479                 return (NULL);
1480         }
1481
1482         initack_offset = init_offset + SCTP_SIZE32(chk_length);
1483         /*
1484          * find and validate the INIT-ACK chunk in the cookie (my info)
1485          * the INIT-ACK follows the INIT chunk
1486          */
1487         initack_cp = (struct sctp_init_ack_chunk *)
1488             sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
1489             (u_int8_t *)&initack_buf);
1490         if (initack_cp == NULL) {
1491                 /* could not pull INIT-ACK chunk in cookie */
1492 #ifdef SCTP_DEBUG
1493                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1494                         kprintf("process_cookie_new: could not pull INIT-ACK chunk hdr\n");
1495                 }
1496 #endif /* SCTP_DEBUG */
1497                 return (NULL);
1498         }
1499         chk_length = ntohs(initack_cp->ch.chunk_length);
1500         if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
1501 #ifdef SCTP_DEBUG
1502                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1503                         u_int8_t *pp;
1504                         pp = (u_int8_t *)initack_cp;
1505                         kprintf("process_cookie_new: could not find INIT-ACK chunk!\n");
1506                         kprintf("Found bytes %x %x %x %x at position %d\n",
1507                             (u_int)pp[0], (u_int)pp[1], (u_int)pp[2],
1508                             (u_int)pp[3], initack_offset);
1509                 }
1510 #endif /* SCTP_DEBUG */
1511                 return (NULL);
1512         }
1513         initack_limit = initack_offset + SCTP_SIZE32(chk_length);
1514
1515         /*
1516          * now that we know the INIT/INIT-ACK are in place,
1517          * create a new TCB and popluate
1518          */
1519         stcb = sctp_aloc_assoc(inp, init_src, 0, &error, ntohl(initack_cp->init.initiate_tag));
1520         if (stcb == NULL) {
1521                 struct mbuf *op_err;
1522                 /* memory problem? */
1523 #ifdef SCTP_DEBUG
1524                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1525                         kprintf("process_cookie_new: no room for another TCB!\n");
1526                 }
1527 #endif /* SCTP_DEBUG */
1528                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
1529                 sctp_abort_association(inp, NULL, m, iphlen,
1530                     sh, op_err);
1531                 return (NULL);
1532         }
1533
1534         /* get the correct sctp_nets */
1535         *netp = sctp_findnet(stcb, init_src);
1536         asoc = &stcb->asoc;
1537         /* get scope variables out of cookie */
1538         asoc->ipv4_local_scope = cookie->ipv4_scope;
1539         asoc->site_scope = cookie->site_scope;
1540         asoc->local_scope = cookie->local_scope;
1541         asoc->loopback_scope = cookie->loopback_scope;
1542
1543         if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) ||
1544             (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) {
1545                 struct mbuf *op_err;
1546                 /*
1547                  * Houston we have a problem. The EP changed while the cookie
1548                  * was in flight. Only recourse is to abort the association.
1549                  */
1550                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
1551                 sctp_abort_association(inp, NULL, m, iphlen,
1552                     sh, op_err);
1553                 return (NULL);
1554         }
1555
1556         /* process the INIT-ACK info (my info) */
1557         old_tag = asoc->my_vtag;
1558         asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
1559         asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
1560         asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
1561         asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
1562         asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
1563         asoc->t3timeout_highest_marked = asoc->asconf_seq_out;
1564         asoc->last_cwr_tsn = asoc->init_seq_number - 1;
1565         asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
1566         asoc->str_reset_seq_in = asoc->init_seq_number;
1567
1568         asoc->advanced_peer_ack_point = asoc->last_acked_seq;
1569
1570         /* process the INIT info (peer's info) */
1571         retval = sctp_process_init(init_cp, stcb, *netp);
1572         if (retval < 0) {
1573 #ifdef SCTP_DEBUG
1574                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1575                         kprintf("process_cookie_new: INIT processing failed\n");
1576                 }
1577 #endif
1578                 sctp_free_assoc(inp, stcb);
1579                 return (NULL);
1580         }
1581         /* load all addresses */
1582         if (sctp_load_addresses_from_init(stcb, m, iphlen,
1583             init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh,
1584             init_src)) {
1585                 sctp_free_assoc(inp, stcb);
1586                 return (NULL);
1587         }
1588
1589         /* update current state */
1590 #ifdef SCTP_DEBUG
1591         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1592                 kprintf("moving to OPEN state\n");
1593         }
1594 #endif
1595         if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
1596                 asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING;
1597         } else {
1598                 asoc->state = SCTP_STATE_OPEN;
1599         }
1600         /* calculate the RTT */
1601         (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
1602             &cookie->time_entered);
1603
1604         /*
1605          * if we're doing ASCONFs, check to see if we have any new
1606          * local addresses that need to get added to the peer (eg.
1607          * addresses changed while cookie echo in flight).  This needs
1608          * to be done after we go to the OPEN state to do the correct
1609          * asconf processing.
1610          * else, make sure we have the correct addresses in our lists
1611          */
1612
1613         /* warning, we re-use sin, sin6, sa_store here! */
1614         /* pull in local_address (our "from" address) */
1615         if (cookie->laddr_type == SCTP_IPV4_ADDRESS) {
1616                 /* source addr is IPv4 */
1617                 sin = (struct sockaddr_in *)initack_src;
1618                 memset(sin, 0, sizeof(*sin));
1619                 sin->sin_family = AF_INET;
1620                 sin->sin_len = sizeof(struct sockaddr_in);
1621                 sin->sin_addr.s_addr = cookie->laddress[0];
1622         } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) {
1623                 /* source addr is IPv6 */
1624                 sin6 = (struct sockaddr_in6 *)initack_src;
1625                 memset(sin6, 0, sizeof(*sin6));
1626                 sin6->sin6_family = AF_INET6;
1627                 sin6->sin6_len = sizeof(struct sockaddr_in6);
1628                 sin6->sin6_scope_id = cookie->scope_id;
1629                 memcpy(&sin6->sin6_addr, cookie->laddress,
1630                     sizeof(sin6->sin6_addr));
1631         } else {
1632                 sctp_free_assoc(inp, stcb);
1633                 return (NULL);
1634         }
1635
1636         sctp_check_address_list(stcb, m, initack_offset +
1637             sizeof(struct sctp_init_ack_chunk), initack_limit,
1638             initack_src, cookie->local_scope, cookie->site_scope,
1639             cookie->ipv4_scope, cookie->loopback_scope);
1640
1641
1642         /* set up to notify upper layer */
1643         *notification = SCTP_NOTIFY_ASSOC_UP;
1644         if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
1645              (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))  &&
1646             !(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_ACCEPTING)) {
1647                 /*
1648                  * This is an endpoint that called connect()
1649                  * how it got a cookie that is NEW is a bit of
1650                  * a mystery. It must be that the INIT was sent, but
1651                  * before it got there.. a complete INIT/INIT-ACK/COOKIE
1652                  * arrived. But of course then it should have went to
1653                  * the other code.. not here.. oh well.. a bit of protection
1654                  * is worth having..
1655                  */
1656                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1657                 soisconnected(stcb->sctp_ep->sctp_socket);
1658                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, *netp);
1659         } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
1660                    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_ACCEPTING)) {
1661                 /*
1662                  * We don't want to do anything with this
1663                  * one. Since it is the listening guy. The timer will
1664                  * get started for accepted connections in the caller.
1665                  */
1666                 ;
1667         } else {
1668                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, *netp);
1669         }
1670         /* since we did not send a HB make sure we don't double things */
1671         (*netp)->hb_responded = 1;
1672
1673         if (stcb->asoc.sctp_autoclose_ticks &&
1674             (inp->sctp_flags & SCTP_PCB_FLAGS_AUTOCLOSE)) {
1675                 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
1676         }
1677
1678         /* respond with a COOKIE-ACK */
1679         sctp_send_cookie_ack(stcb);
1680
1681         return (stcb);
1682 }
1683
1684
1685 /*
1686  * handles a COOKIE-ECHO message
1687  * stcb: modified to either a new or left as existing (non-NULL) TCB
1688  */
1689 static struct mbuf *
1690 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
1691     struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
1692     struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp)
1693 {
1694         struct sctp_state_cookie *cookie;
1695         struct sockaddr_in6 sin6;
1696         struct sockaddr_in sin;
1697         struct sctp_tcb *l_stcb=*stcb;
1698         struct sctp_inpcb *l_inp;
1699         struct sockaddr *to;
1700         struct sctp_pcb *ep;
1701         struct mbuf *m_sig;
1702         uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
1703         uint8_t *sig;
1704         uint8_t cookie_ok = 0;
1705         unsigned int size_of_pkt, sig_offset, cookie_offset;
1706         unsigned int cookie_len;
1707         struct timeval now;
1708         struct timeval time_expires;
1709         struct sockaddr_storage dest_store;
1710         struct sockaddr *localep_sa = (struct sockaddr *)&dest_store;
1711         struct ip *iph;
1712         int notification = 0;
1713         struct sctp_nets *netl;
1714         int had_a_existing_tcb = 0;
1715
1716 #ifdef SCTP_DEBUG
1717         if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1718                 kprintf("sctp_handle_cookie: handling COOKIE-ECHO\n");
1719         }
1720 #endif
1721
1722         if (inp_p == NULL) {
1723 #ifdef SCTP_DEBUG
1724                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1725                         kprintf("sctp_handle_cookie: null inp_p!\n");
1726                 }
1727 #endif
1728                 return (NULL);
1729         }
1730         /* First get the destination address setup too. */
1731         iph = mtod(m, struct ip *);
1732         if (iph->ip_v == IPVERSION) {
1733                 /* its IPv4 */
1734                 struct sockaddr_in *sin;
1735                 sin = (struct sockaddr_in *)(localep_sa);
1736                 memset(sin, 0, sizeof(*sin));
1737                 sin->sin_family = AF_INET;
1738                 sin->sin_len = sizeof(*sin);
1739                 sin->sin_port = sh->dest_port;
1740                 sin->sin_addr.s_addr = iph->ip_dst.s_addr ;
1741         } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
1742                 /* its IPv6 */
1743                 struct ip6_hdr *ip6;
1744                 struct sockaddr_in6 *sin6;
1745                 sin6 = (struct sockaddr_in6 *)(localep_sa);
1746                 memset(sin6, 0, sizeof(*sin6));
1747                 sin6->sin6_family = AF_INET6;
1748                 sin6->sin6_len = sizeof(struct sockaddr_in6);
1749                 ip6 = mtod(m, struct ip6_hdr *);
1750                 sin6->sin6_port = sh->dest_port;
1751                 sin6->sin6_addr = ip6->ip6_dst;
1752         } else {
1753                 return (NULL);
1754         }
1755
1756         cookie = &cp->cookie;
1757         cookie_offset = offset + sizeof(struct sctp_chunkhdr);
1758         cookie_len = ntohs(cp->ch.chunk_length);
1759
1760         if ((cookie->peerport != sh->src_port) &&
1761             (cookie->myport != sh->dest_port) &&
1762             (cookie->my_vtag != sh->v_tag)) {
1763                 /*
1764                  * invalid ports or bad tag.  Note that we always leave
1765                  * the v_tag in the header in network order and when we
1766                  * stored it in the my_vtag slot we also left it in network
1767                  * order. This maintians the match even though it may be in
1768                  * the opposite byte order of the machine :->
1769                  */
1770                 return (NULL);
1771         }
1772
1773         /* compute size of packet */
1774         if (m->m_flags & M_PKTHDR) {
1775                 size_of_pkt = m->m_pkthdr.len;
1776         } else {
1777                 /* Should have a pkt hdr really */
1778                 struct mbuf *mat;
1779                 mat = m;
1780                 size_of_pkt = 0;
1781                 while (mat != NULL) {
1782                         size_of_pkt += mat->m_len;
1783                         mat = mat->m_next;
1784                 }
1785         }
1786         if (cookie_len > size_of_pkt ||
1787             cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
1788             sizeof(struct sctp_init_chunk) +
1789             sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
1790                 /* cookie too long!  or too small */
1791 #ifdef SCTP_DEBUG
1792                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1793                         kprintf("sctp_handle_cookie: cookie_len=%u, pkt size=%u\n", cookie_len, size_of_pkt);
1794                 }
1795 #endif /* SCTP_DEBUG */
1796                 return (NULL);
1797         }
1798         /*
1799          * split off the signature into its own mbuf (since it
1800          * should not be calculated in the sctp_hash_digest_m() call).
1801          */
1802         sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
1803         if (sig_offset > size_of_pkt) {
1804                 /* packet not correct size! */
1805                 /* XXX this may already be accounted for earlier... */
1806 #ifdef SCTP_DEBUG
1807                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1808                         kprintf("sctp_handle_cookie: sig offset=%u, pkt size=%u\n", sig_offset, size_of_pkt);
1809                 }
1810 #endif
1811                 return (NULL);
1812         }
1813
1814         m_sig = m_split(m, sig_offset, MB_DONTWAIT);
1815         if (m_sig == NULL) {
1816                 /* out of memory or ?? */
1817 #ifdef SCTP_DEBUG
1818                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1819                         kprintf("sctp_handle_cookie: couldn't m_split the signature\n");
1820                 }
1821 #endif
1822                 return (NULL);
1823         }
1824         /*
1825          * compute the signature/digest for the cookie
1826          */
1827         ep = &(*inp_p)->sctp_ep;
1828         l_inp = *inp_p;
1829         if (l_stcb) {
1830                 SCTP_TCB_UNLOCK(l_stcb);
1831         }
1832         SCTP_INP_RLOCK(l_inp);
1833         if (l_stcb) {
1834                 SCTP_TCB_LOCK(l_stcb);
1835         }
1836         /* which cookie is it? */
1837         if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
1838             (ep->current_secret_number != ep->last_secret_number)) {
1839                 /* it's the old cookie */
1840 #ifdef SCTP_DEBUG
1841                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1842                         kprintf("sctp_handle_cookie: old cookie sig\n");
1843                 }
1844 #endif
1845                 sctp_hash_digest_m((char *)ep->secret_key[(int)ep->last_secret_number],
1846                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig);
1847         } else {
1848                 /* it's the current cookie */
1849 #ifdef SCTP_DEBUG
1850                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1851                         kprintf("sctp_handle_cookie: current cookie sig\n");
1852                 }
1853 #endif
1854                 sctp_hash_digest_m((char *)ep->secret_key[(int)ep->current_secret_number],
1855                     SCTP_SECRET_SIZE, m, cookie_offset, calc_sig);
1856         }
1857         /* get the signature */
1858         SCTP_INP_RUNLOCK(l_inp);
1859         sig = (u_int8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (u_int8_t *)&tmp_sig);
1860         if (sig == NULL) {
1861                 /* couldn't find signature */
1862 #ifdef SCTP_DEBUG
1863                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
1864                         kprintf("sctp_handle_cookie: couldn't pull the signature\n");
1865                 }
1866 #endif
1867                 return (NULL);
1868         }
1869         /* compare the received digest with the computed digest */
1870         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
1871                 /* try the old cookie? */
1872                 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
1873                     (ep->current_secret_number != ep->last_secret_number)) {
1874                         /* compute digest with old */
1875 #ifdef SCTP_DEBUG
1876                         if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1877                                 kprintf("sctp_handle_cookie: old cookie sig\n");
1878                         }
1879 #endif
1880                         sctp_hash_digest_m((char *)ep->secret_key[(int)ep->last_secret_number],
1881                             SCTP_SECRET_SIZE, m, cookie_offset, calc_sig);
1882                         /* compare */
1883                         if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
1884                                 cookie_ok = 1;
1885                 }
1886         } else {
1887                 cookie_ok = 1;
1888         }
1889
1890         /*
1891          * Now before we continue we must reconstruct our mbuf so
1892          * that normal processing of any other chunks will work.
1893          */
1894         {
1895                 struct mbuf *m_at;
1896                 m_at = m;
1897                 while (m_at->m_next != NULL) {
1898                         m_at = m_at->m_next;
1899                 }
1900                 m_at->m_next = m_sig;
1901                 if (m->m_flags & M_PKTHDR) {
1902                         /*
1903                          * We should only do this if and only if the front
1904                          * mbuf has a m_pkthdr... it should in theory.
1905                          */
1906                         if (m_sig->m_flags & M_PKTHDR) {
1907                                 /* Add back to the pkt hdr of main m chain */
1908                                 m->m_pkthdr.len += m_sig->m_len;
1909                         } else {
1910                                 /*
1911                                  * Got a problem, no pkthdr in split chain.
1912                                  * TSNH but we will handle it just in case
1913                                  */
1914                                 int mmlen = 0;
1915                                 struct mbuf *lat;
1916                                 kprintf("Warning: Hitting m_split join TSNH code - fixed\n");
1917                                 lat = m_sig;
1918                                 while (lat) {
1919                                         mmlen += lat->m_len;
1920                                         lat = lat->m_next;
1921                                 }
1922                                 m->m_pkthdr.len += mmlen;
1923                         }
1924                 }
1925         }
1926
1927         if (cookie_ok == 0) {
1928 #ifdef SCTP_DEBUG
1929                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1930                         kprintf("handle_cookie_echo: cookie signature validation failed!\n");
1931                         kprintf("offset = %u, cookie_offset = %u, sig_offset = %u\n",
1932                             (u_int32_t)offset, cookie_offset, sig_offset);
1933                 }
1934 #endif
1935                 return (NULL);
1936         }
1937 #ifdef SCTP_DEBUG
1938         if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
1939                 kprintf("handle_cookie_echo: cookie signature validation passed\n");
1940         }
1941 #endif
1942
1943         /*
1944          * check the cookie timestamps to be sure it's not stale
1945          */
1946         SCTP_GETTIME_TIMEVAL(&now);
1947         /* Expire time is in Ticks, so we convert to seconds */
1948         time_expires.tv_sec = cookie->time_entered.tv_sec + cookie->cookie_life;
1949         time_expires.tv_usec = cookie->time_entered.tv_usec;
1950 #ifndef __FreeBSD__
1951         if (timercmp(&now, &time_expires, >))
1952 #else
1953         if (timevalcmp(&now, &time_expires, >))
1954 #endif
1955         {
1956                 /* cookie is stale! */
1957                 struct mbuf *op_err;
1958                 struct sctp_stale_cookie_msg *scm;
1959                 u_int32_t tim;
1960 #ifdef SCTP_DEBUG
1961                 if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
1962                         kprintf("sctp_handle_cookie: got a STALE cookie!\n");
1963                 }
1964 #endif
1965                 MGETHDR(op_err, MB_DONTWAIT, MT_HEADER);
1966                 if (op_err == NULL) {
1967                         /* FOOBAR */
1968                         return (NULL);
1969                 }
1970                 /* pre-reserve some space */
1971                 op_err->m_data += sizeof(struct ip6_hdr);
1972                 op_err->m_data += sizeof(struct sctphdr);
1973                 op_err->m_data += sizeof(struct sctp_chunkhdr);
1974
1975                 /* Set the len */
1976                 op_err->m_len = op_err->m_pkthdr.len = sizeof(struct sctp_stale_cookie_msg);
1977                 scm = mtod(op_err, struct sctp_stale_cookie_msg *);
1978                 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE);
1979                 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) +
1980                     (sizeof(u_int32_t))));
1981                 /* seconds to usec */
1982                 tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
1983                 /* add in usec */
1984                 if (tim == 0)
1985                         tim = now.tv_usec - cookie->time_entered.tv_usec;
1986                 scm->time_usec = htonl(tim);
1987                 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag);
1988                 return (NULL);
1989         }
1990         /*
1991          * Now we must see with the lookup address if we have an existing
1992          * asoc. This will only happen if we were in the COOKIE-WAIT state
1993          * and a INIT collided with us and somewhere the peer sent the
1994          * cookie on another address besides the single address our assoc
1995          * had for him. In this case we will have one of the tie-tags set
1996          * at least AND the address field in the cookie can be used to
1997          * look it up.
1998          */
1999         to = NULL;
2000         if (cookie->addr_type == SCTP_IPV6_ADDRESS) {
2001                 memset(&sin6, 0, sizeof(sin6));
2002                 sin6.sin6_family = AF_INET6;
2003                 sin6.sin6_len = sizeof(sin6);
2004                 sin6.sin6_port = sh->src_port;
2005                 sin6.sin6_scope_id = cookie->scope_id;
2006                 memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
2007                        sizeof(sin6.sin6_addr.s6_addr));
2008                 to = (struct sockaddr *)&sin6;
2009         } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) {
2010                 memset(&sin, 0, sizeof(sin));
2011                 sin.sin_family = AF_INET;
2012                 sin.sin_len = sizeof(sin);
2013                 sin.sin_port = sh->src_port;
2014                 sin.sin_addr.s_addr = cookie->address[0];
2015                 to = (struct sockaddr *)&sin;
2016         }
2017
2018         if ((*stcb == NULL) && to) {
2019                 /* Yep, lets check */
2020                 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL);
2021                 if (*stcb == NULL) {
2022                         /* We should have only got back the same inp. If we
2023                          * got back a different ep we have a problem. The original
2024                          * findep got back l_inp and now
2025                          */
2026                         if (l_inp != *inp_p) {
2027                                 kprintf("Bad problem find_ep got a diff inp then special_locate?\n");
2028                         }
2029                 }
2030         }
2031
2032         cookie_len -= SCTP_SIGNATURE_SIZE;
2033         if (*stcb == NULL) {
2034                 /* this is the "normal" case... get a new TCB */
2035 #ifdef SCTP_DEBUG
2036                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
2037                         kprintf("sctp_handle_cookie: processing NEW cookie\n");
2038                 }
2039 #endif
2040                 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie,
2041                     cookie_len, *inp_p, netp, to, &notification);
2042                 /* now always decrement, since this is the normal
2043                  * case.. we had no tcb when we entered.
2044                  */
2045         } else {
2046                 /* this is abnormal... cookie-echo on existing TCB */
2047 #ifdef SCTP_DEBUG
2048                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
2049                         kprintf("sctp_handle_cookie: processing EXISTING cookie\n");
2050                 }
2051 #endif
2052                 had_a_existing_tcb = 1;
2053                 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh,
2054                     cookie, cookie_len, *inp_p, *stcb, *netp, to, &notification);
2055         }
2056
2057         if (*stcb == NULL) {
2058                 /* still no TCB... must be bad cookie-echo */
2059 #ifdef SCTP_DEBUG
2060                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
2061                         kprintf("handle_cookie_echo: ACK! don't have a TCB!\n");
2062                 }
2063 #endif /* SCTP_DEBUG */
2064                 return (NULL);
2065         }
2066
2067         /*
2068          * Ok, we built an association so confirm the address
2069          * we sent the INIT-ACK to.
2070          */
2071         netl = sctp_findnet(*stcb, to);
2072         /* This code should in theory NOT run but
2073          */
2074         if (netl == NULL) {
2075                 int ret;
2076 #ifdef SCTP_DEBUG
2077                 kprintf("TSNH! Huh, why do I need to add this address here?\n");
2078 #endif
2079                 ret = sctp_add_remote_addr(*stcb, to, 0, 100);
2080                 netl = sctp_findnet(*stcb, to);
2081         }
2082         if (netl) {
2083                 if (netl->dest_state &  SCTP_ADDR_UNCONFIRMED) {
2084                         netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
2085                         sctp_set_primary_addr((*stcb), NULL,
2086                                               netl);
2087                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
2088                                         (*stcb), 0, (void *)netl);
2089                 }
2090         }
2091 #ifdef SCTP_DEBUG
2092         else {
2093                 kprintf("Could not add source address for some reason\n");
2094         }
2095 #endif
2096
2097         if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
2098                 if (!had_a_existing_tcb ||
2099                     (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
2100                         /*
2101                          * If we have a NEW cookie or the connect never reached
2102                          * the connected state during collision we must do the
2103                          * TCP accept thing.
2104                          */
2105                         struct socket *so, *oso;
2106                         struct sctp_inpcb *inp;
2107                         if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
2108                                 /*
2109                                  * For a restart we will keep the same socket,
2110                                  * no need to do anything. I THINK!!
2111                                  */
2112                                 sctp_ulp_notify(notification, *stcb, 0, NULL);
2113                                 return (m);
2114                         }
2115                         oso = (*inp_p)->sctp_socket;
2116                         SCTP_TCB_UNLOCK((*stcb));
2117                         so = sonewconn(oso, SS_ISCONNECTED);
2118                         SCTP_INP_WLOCK((*stcb)->sctp_ep);
2119                         SCTP_TCB_LOCK((*stcb));
2120                         SCTP_INP_WUNLOCK((*stcb)->sctp_ep);
2121                         if (so == NULL) {
2122                                 struct mbuf *op_err;
2123                                 /* Too many sockets */
2124 #ifdef SCTP_DEBUG
2125                                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
2126                                         kprintf("process_cookie_new: no room for another socket!\n");
2127                                 }
2128 #endif /* SCTP_DEBUG */
2129                                 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC);
2130                                 sctp_abort_association(*inp_p, NULL, m, iphlen,
2131                                     sh, op_err);
2132                                 sctp_free_assoc(*inp_p, *stcb);
2133                                 return (NULL);
2134                         }
2135                         inp = (struct sctp_inpcb *)so->so_pcb;
2136                         inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
2137                             SCTP_PCB_FLAGS_CONNECTED |
2138                             SCTP_PCB_FLAGS_IN_TCPPOOL |
2139                             (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
2140                             SCTP_PCB_FLAGS_DONT_WAKE);
2141                         inp->sctp_socket = so;
2142
2143                         /*
2144                          * Now we must move it from one hash table to another
2145                          * and get the tcb in the right place.
2146                          */
2147                         sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
2148
2149                         /* Switch over to the new guy */
2150                         *inp_p = inp;
2151
2152                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, inp,
2153                             *stcb, *netp);
2154
2155                         sctp_ulp_notify(notification, *stcb, 0, NULL);
2156                         return (m);
2157                 }
2158         }
2159         if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
2160                 sctp_ulp_notify(notification, *stcb, 0, NULL);
2161         }
2162         return (m);
2163 }
2164
2165 static void
2166 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp,
2167     struct sctp_tcb *stcb, struct sctp_nets *net)
2168 {
2169         /* cp must not be used, others call this without a c-ack :-) */
2170         struct sctp_association *asoc;
2171
2172 #ifdef SCTP_DEBUG
2173         if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
2174                 kprintf("sctp_handle_cookie_ack: handling COOKIE-ACK\n");
2175         }
2176 #endif
2177         if (stcb == NULL)
2178                 return;
2179
2180         asoc = &stcb->asoc;
2181
2182         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, stcb, net);
2183
2184         /* process according to association state */
2185         if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
2186                 /* state change only needed when I am in right state */
2187 #ifdef SCTP_DEBUG
2188                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
2189                         kprintf("moving to OPEN state\n");
2190                 }
2191 #endif
2192                 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
2193                         asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING;
2194                 } else {
2195                         asoc->state = SCTP_STATE_OPEN;
2196                 }
2197
2198                 /* update RTO */
2199                 if (asoc->overall_error_count == 0) {
2200                         net->RTO = sctp_calculate_rto(stcb, asoc, net,
2201                             &asoc->time_entered);
2202                 }
2203                 SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
2204                 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL);
2205                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2206                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2207                         stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
2208                         soisconnected(stcb->sctp_ep->sctp_socket);
2209                 }
2210                 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
2211                     stcb, net);
2212                 /* since we did not send a HB make sure we don't double things */
2213                 net->hb_responded = 1;
2214
2215                 if (stcb->asoc.sctp_autoclose_ticks &&
2216                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_AUTOCLOSE)) {
2217                         sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
2218                             stcb->sctp_ep, stcb, NULL);
2219                 }
2220
2221                 /*
2222                  * set ASCONF timer if ASCONFs are pending and allowed
2223                  * (eg. addresses changed when init/cookie echo in flight)
2224                  */
2225                 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_DO_ASCONF) &&
2226                     (stcb->asoc.peer_supports_asconf) &&
2227                     (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
2228                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
2229                             stcb->sctp_ep, stcb,
2230                             stcb->asoc.primary_destination);
2231                 }
2232
2233         }
2234         /* Toss the cookie if I can */
2235         sctp_toss_old_cookies(asoc);
2236         if (!TAILQ_EMPTY(&asoc->sent_queue)) {
2237                 /* Restart the timer if we have pending data */
2238                 struct sctp_tmit_chunk *chk;
2239                 chk = TAILQ_FIRST(&asoc->sent_queue);
2240                 if (chk) {
2241                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
2242                             stcb, chk->whoTo);
2243                 }
2244         }
2245
2246 }
2247
2248 static void
2249 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
2250     struct sctp_tcb *stcb)
2251 {
2252         struct sctp_nets *net;
2253         struct sctp_tmit_chunk *lchk;
2254         u_int32_t tsn;
2255         if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) {
2256                 return;
2257         }
2258         sctp_pegs[SCTP_ECNE_RCVD]++;
2259         tsn = ntohl(cp->tsn);
2260         /* ECN Nonce stuff: need a resync and disable the nonce sum check */
2261         /* Also we make sure we disable the nonce_wait */
2262         lchk = TAILQ_FIRST(&stcb->asoc.send_queue);
2263         if (lchk == NULL) {
2264                 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq;
2265         } else {
2266                 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq;
2267         }
2268         stcb->asoc.nonce_wait_for_ecne = 0;
2269         stcb->asoc.nonce_sum_check = 0;
2270
2271         /* Find where it was sent, if possible */
2272         net = NULL;
2273         lchk = TAILQ_FIRST(&stcb->asoc.sent_queue);
2274         while (lchk) {
2275                 if (lchk->rec.data.TSN_seq == tsn) {
2276                         net = lchk->whoTo;
2277                         break;
2278                 }
2279                 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ))
2280                         break;
2281                 lchk = TAILQ_NEXT(lchk, sctp_next);
2282         }
2283         if (net == NULL)
2284                 /* default is we use the primary */
2285                 net = stcb->asoc.primary_destination;
2286
2287         if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) {
2288 #ifdef SCTP_CWND_LOGGING
2289                 int old_cwnd;
2290 #endif
2291 #ifdef SCTP_CWND_LOGGING
2292                 old_cwnd = net->cwnd;
2293 #endif
2294                 sctp_pegs[SCTP_CWR_PERFO]++;
2295                 net->ssthresh = net->cwnd / 2;
2296                 if (net->ssthresh < net->mtu) {
2297                         net->ssthresh = net->mtu;
2298                         /* here back off the timer as well, to slow us down */
2299                         net->RTO <<= 2;
2300                 }
2301                 net->cwnd = net->ssthresh;
2302 #ifdef SCTP_CWND_LOGGING
2303                 sctp_log_cwnd(net, (net->cwnd-old_cwnd), SCTP_CWND_LOG_FROM_SAT);
2304 #endif
2305                 /* we reduce once every RTT. So we will only lower
2306                  * cwnd at the next sending seq i.e. the resync_tsn.
2307                  */
2308                 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn;
2309         }
2310         /*
2311          * We always send a CWR this way if our previous one was lost
2312          * our peer will get an update, or if it is not time again
2313          * to reduce we still get the cwr to the peer.
2314          */
2315         sctp_send_cwr(stcb, net, tsn);
2316 }
2317
2318 static void
2319 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb)
2320 {
2321         /* Here we get a CWR from the peer. We must look in
2322          * the outqueue and make sure that we have a covered
2323          * ECNE in teh control chunk part. If so remove it.
2324          */
2325         struct sctp_tmit_chunk *chk;
2326         struct sctp_ecne_chunk *ecne;
2327
2328         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
2329                 if (chk->rec.chunk_id != SCTP_ECN_ECHO) {
2330                         continue;
2331                 }
2332                 /* Look for and remove if it is the right TSN. Since
2333                  * there is only ONE ECNE on the control queue at
2334                  * any one time we don't need to worry about more than
2335                  * one!
2336                  */
2337                 ecne = mtod(chk->data, struct sctp_ecne_chunk *);
2338                 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn),
2339                     MAX_TSN) || (cp->tsn == ecne->tsn)) {
2340                         /* this covers this ECNE, we can remove it */
2341                         TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
2342                             sctp_next);
2343                         if (chk->data) {
2344                                 sctp_m_freem(chk->data);
2345                                 chk->data = NULL;
2346                         }
2347                         stcb->asoc.ctrl_queue_cnt--;
2348                         sctp_free_remote_addr(chk->whoTo);
2349                         SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
2350                         sctppcbinfo.ipi_count_chunk--;
2351                         if ((int)sctppcbinfo.ipi_count_chunk < 0) {
2352                                 panic("Chunk count is negative");
2353                         }
2354                         sctppcbinfo.ipi_gencnt_chunk++;
2355                         break;
2356                 }
2357         }
2358 }
2359
2360 static void
2361 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp,
2362     struct sctp_tcb *stcb, struct sctp_nets *net)
2363 {
2364         struct sctp_association *asoc;
2365
2366 #ifdef SCTP_DEBUG
2367         if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
2368                 kprintf("sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
2369         }
2370 #endif
2371         if (stcb == NULL)
2372                 return;
2373
2374         asoc = &stcb->asoc;
2375         /* process according to association state */
2376         if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
2377                 /* unexpected SHUTDOWN-COMPLETE... so ignore... */
2378                 return;
2379         }
2380         /* notify upper layer protocol */
2381         sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL);
2382         if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
2383             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
2384                 stcb->sctp_ep->sctp_flags &= ~SCTP_PCB_FLAGS_CONNECTED;
2385                 stcb->sctp_ep->sctp_socket->so_snd.ssb_cc = 0;
2386                 stcb->sctp_ep->sctp_socket->so_snd.ssb_mbcnt = 0;
2387                 soisdisconnected(stcb->sctp_ep->sctp_socket);
2388         }
2389         /* are the queues empty? they should be */
2390         if (!TAILQ_EMPTY(&asoc->send_queue) ||
2391             !TAILQ_EMPTY(&asoc->sent_queue) ||
2392             !TAILQ_EMPTY(&asoc->out_wheel)) {
2393                 sctp_report_all_outbound(stcb);
2394         }
2395         /* stop the timer */
2396         sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net);
2397         /* free the TCB */
2398         sctp_free_assoc(stcb->sctp_ep, stcb);
2399         return;
2400 }
2401
2402 static int
2403 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
2404     struct sctp_nets *net, u_int8_t flg)
2405 {
2406         switch (desc->chunk_type) {
2407         case SCTP_DATA:
2408                 /* find the tsn to resend (possibly */
2409         {
2410                 u_int32_t tsn;
2411                 struct sctp_tmit_chunk *tp1;
2412                 tsn = ntohl(desc->tsn_ifany);
2413                 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
2414                 while (tp1) {
2415                         if (tp1->rec.data.TSN_seq == tsn) {
2416                                 /* found it */
2417                                 break;
2418                         }
2419                         if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn,
2420                                               MAX_TSN)) {
2421                                 /* not found */
2422                                 tp1 = NULL;
2423                                 break;
2424                         }
2425                         tp1 = TAILQ_NEXT(tp1, sctp_next);
2426                 }
2427                 if (tp1 == NULL) {
2428                         /* Do it the other way */
2429                         sctp_pegs[SCTP_PDRP_DNFND]++;
2430                         tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
2431                         while (tp1) {
2432                                 if (tp1->rec.data.TSN_seq == tsn) {
2433                                         /* found it */
2434                                         break;
2435                                 }
2436                                 tp1 = TAILQ_NEXT(tp1, sctp_next);
2437                         }
2438                 }
2439                 if (tp1 == NULL) {
2440                         sctp_pegs[SCTP_PDRP_TSNNF]++;
2441                 }
2442                 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
2443                         u_int8_t *ddp;
2444                         if (((tp1->rec.data.state_flags & SCTP_WINDOW_PROBE) == SCTP_WINDOW_PROBE) &&
2445                             ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
2446                                 sctp_pegs[SCTP_PDRP_DIWNP]++;
2447                                 return (0);
2448                         }
2449                         if (stcb->asoc.peers_rwnd == 0 &&
2450                             (flg & SCTP_FROM_MIDDLE_BOX)) {
2451                                 sctp_pegs[SCTP_PDRP_DIZRW]++;
2452                                 return (0);
2453                         }
2454                         ddp = (u_int8_t *)(mtod(tp1->data, caddr_t) +
2455                             sizeof(struct sctp_data_chunk));
2456                         {
2457                                 unsigned int iii;
2458                                 for (iii = 0; iii < sizeof(desc->data_bytes);
2459                                     iii++) {
2460                                         if (ddp[iii] != desc->data_bytes[iii]) {
2461                                                 sctp_pegs[SCTP_PDRP_BADD]++;
2462                                                 return (-1);
2463                                         }
2464                                 }
2465                         }
2466                         if (tp1->sent != SCTP_DATAGRAM_RESEND) {
2467                                 stcb->asoc.sent_queue_retran_cnt++;
2468                         }
2469                         /* We zero out the nonce so resync not needed */
2470                         tp1->rec.data.ect_nonce = 0;
2471
2472                         if (tp1->do_rtt) {
2473                                 /*
2474                                  * this guy had a RTO calculation pending on it,
2475                                  * cancel it
2476                                  */
2477                                 tp1->whoTo->rto_pending = 0;
2478                                 tp1->do_rtt = 0;
2479                         }
2480                         sctp_pegs[SCTP_PDRP_MARK]++;
2481                         tp1->sent = SCTP_DATAGRAM_RESEND;
2482                         /*
2483                          * mark it as if we were doing a FR, since we
2484                          * will be getting gap ack reports behind the
2485                          * info from the router.
2486                          */
2487                         tp1->rec.data.doing_fast_retransmit = 1;
2488                         /*
2489                          * mark the tsn with what sequences can cause a new FR.
2490                          */
2491                         if (TAILQ_EMPTY(&stcb->asoc.send_queue) ) {
2492                                 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
2493                         } else {
2494                                 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
2495                         }
2496
2497                         /* restart the timer */
2498                         sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
2499                             stcb, tp1->whoTo);
2500                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
2501                             stcb, tp1->whoTo);
2502
2503                         /* fix counts and things */
2504                         tp1->whoTo->flight_size -= tp1->send_size;
2505                         if (tp1->whoTo->flight_size < 0) {
2506                                 tp1->whoTo->flight_size = 0;
2507                         }
2508                         stcb->asoc.total_flight -= tp1->book_size;
2509                         if (stcb->asoc.total_flight < 0) {
2510                                 stcb->asoc.total_flight = 0;
2511                         }
2512                         stcb->asoc.total_flight_count--;
2513                         if (stcb->asoc.total_flight_count < 0) {
2514                                 stcb->asoc.total_flight_count = 0;
2515                         }
2516                         tp1->snd_count--;
2517                 }
2518                 {
2519                         /* audit code */
2520                         unsigned int audit;
2521                         audit = 0;
2522                         TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
2523                                 if (tp1->sent == SCTP_DATAGRAM_RESEND)
2524                                         audit++;
2525                         }
2526                         TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
2527                             sctp_next) {
2528                                 if (tp1->sent == SCTP_DATAGRAM_RESEND)
2529                                         audit++;
2530                         }
2531                         if (audit != stcb->asoc.sent_queue_retran_cnt) {
2532                                 kprintf("**Local Audit finds cnt:%d asoc cnt:%d\n",
2533                                     audit, stcb->asoc.sent_queue_retran_cnt);
2534 #ifndef SCTP_AUDITING_ENABLED
2535                                 stcb->asoc.sent_queue_retran_cnt = audit;
2536 #endif
2537                         }
2538                 }
2539         }
2540         break;
2541         case SCTP_ASCONF:
2542         {
2543                 struct sctp_tmit_chunk *asconf;
2544                 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
2545                     sctp_next) {
2546                         if (asconf->rec.chunk_id == SCTP_ASCONF) {
2547                                 break;
2548                         }
2549                 }
2550                 if (asconf) {
2551                         if (asconf->sent != SCTP_DATAGRAM_RESEND)
2552                                 stcb->asoc.sent_queue_retran_cnt++;
2553                         asconf->sent = SCTP_DATAGRAM_RESEND;
2554                         asconf->snd_count--;
2555                 }
2556         }
2557         break;
2558         case SCTP_INITIATION:
2559                 /* resend the INIT */
2560                 stcb->asoc.dropped_special_cnt++;
2561                 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
2562                         /*
2563                          * If we can get it in, in a few attempts we do this,
2564                          * otherwise we let the timer fire.
2565                          */
2566                         sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
2567                             stcb, net);
2568                         sctp_send_initiate(stcb->sctp_ep, stcb);
2569                 }
2570                 break;
2571         case SCTP_SELECTIVE_ACK:
2572                 /* resend the sack */
2573                 sctp_send_sack(stcb);
2574                 break;
2575         case SCTP_HEARTBEAT_REQUEST:
2576                 /* resend a demand HB */
2577                 sctp_send_hb(stcb, 1, net);
2578                 break;
2579         case SCTP_SHUTDOWN:
2580 #ifdef SCTP_DEBUG
2581                 if (sctp_debug_on & SCTP_DEBUG_OUTPUT4) {
2582                         kprintf("%s:%d sends a shutdown\n",
2583                                __FILE__,
2584                                __LINE__
2585                                 );
2586                 }
2587 #endif
2588                 sctp_send_shutdown(stcb, net);
2589                 break;
2590         case SCTP_SHUTDOWN_ACK:
2591                 sctp_send_shutdown_ack(stcb, net);
2592                 break;
2593         case SCTP_COOKIE_ECHO:
2594         {
2595                 struct sctp_tmit_chunk *cookie;
2596                 cookie = NULL;
2597                 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
2598                     sctp_next) {
2599                         if (cookie->rec.chunk_id == SCTP_COOKIE_ECHO) {
2600                                 break;
2601                         }
2602                 }
2603                 if (cookie) {
2604                         if (cookie->sent != SCTP_DATAGRAM_RESEND)
2605                                 stcb->asoc.sent_queue_retran_cnt++;
2606                         cookie->sent = SCTP_DATAGRAM_RESEND;
2607                         sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, stcb, net);
2608                 }
2609         }
2610         break;
2611         case SCTP_COOKIE_ACK:
2612                 sctp_send_cookie_ack(stcb);
2613                 break;
2614         case SCTP_ASCONF_ACK:
2615                 /* resend last asconf ack */
2616                 sctp_send_asconf_ack(stcb, 1);
2617                 break;
2618         case SCTP_FORWARD_CUM_TSN:
2619                 send_forward_tsn(stcb, &stcb->asoc);
2620                 break;
2621                 /* can't do anything with these */
2622         case SCTP_PACKET_DROPPED:
2623         case SCTP_INITIATION_ACK:       /* this should not happen */
2624         case SCTP_HEARTBEAT_ACK:
2625         case SCTP_ABORT_ASSOCIATION:
2626         case SCTP_OPERATION_ERROR:
2627         case SCTP_SHUTDOWN_COMPLETE:
2628         case SCTP_ECN_ECHO:
2629         case SCTP_ECN_CWR:
2630         default:
2631                 break;
2632         }
2633         return (0);
2634 }
2635
2636 static void
2637 sctp_reset_in_stream(struct sctp_tcb *stcb,
2638     struct sctp_stream_reset_response *resp, int number_entries)
2639 {
2640         int i;
2641         uint16_t *list, temp;
2642
2643         /* We set things to 0xffff since this is the last delivered
2644          * sequence and we will be sending in 0 after the reset.
2645          */
2646
2647         if (resp->reset_flags & SCTP_RESET_PERFORMED) {
2648                 if (number_entries) {
2649                         list = resp->list_of_streams;
2650                         for (i = 0; i < number_entries; i++) {
2651                                 temp = ntohs(list[i]);
2652                                 list[i] = temp;
2653                                 if (list[i] >= stcb->asoc.streamincnt) {
2654                                         kprintf("Invalid stream in-stream reset %d\n", list[i]);
2655                                         continue;
2656                                 }
2657                                 stcb->asoc.strmin[(list[i])].last_sequence_delivered = 0xffff;
2658                         }
2659                 } else {
2660                         list = NULL;
2661                         for (i = 0; i < stcb->asoc.streamincnt; i++) {
2662                                 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff;
2663                         }
2664                 }
2665                 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list);
2666         }
2667 }
2668
2669 static void
2670 sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
2671 {
2672         struct sctp_tmit_chunk *chk, *nchk;
2673         struct sctp_association *asoc;
2674
2675         asoc = &stcb->asoc;
2676
2677         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
2678             chk; chk = nchk) {
2679                 nchk = TAILQ_NEXT(chk, sctp_next);
2680                 if (chk->rec.chunk_id == SCTP_STREAM_RESET) {
2681                         struct sctp_stream_reset_req *strreq;
2682                         strreq = mtod(chk->data, struct sctp_stream_reset_req *);
2683                         if (strreq->sr_req.ph.param_type == ntohs(SCTP_STR_RESET_RESPONSE)) {
2684                                 /* we only clean up the request */
2685                                 continue;
2686                         } else if (strreq->sr_req.ph.param_type != ntohs(SCTP_STR_RESET_REQUEST)) {
2687                                 kprintf("TSNH, an unknown stream reset request is in queue %x\n",
2688                                        (u_int)ntohs(strreq->sr_req.ph.param_type));
2689                                 continue;
2690                         }
2691                         sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
2692                         TAILQ_REMOVE(&asoc->control_send_queue,
2693                                      chk,
2694                                      sctp_next);
2695                         if (chk->data) {
2696                                 sctp_m_freem(chk->data);
2697                                 chk->data = NULL;
2698                         }
2699                         asoc->ctrl_queue_cnt--;
2700                         sctp_free_remote_addr(chk->whoTo);
2701                         SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
2702                         sctppcbinfo.ipi_count_chunk--;
2703                         if ((int)sctppcbinfo.ipi_count_chunk < 0) {
2704                                 panic("Chunk count is negative");
2705                         }
2706                         sctppcbinfo.ipi_gencnt_chunk++;
2707                         /* we can only have one of these so we break */
2708                         break;
2709                 }
2710         }
2711 }
2712
2713
2714 void
2715 sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
2716         struct sctp_stream_reset_response *resp)
2717 {
2718         uint32_t seq, tsn;
2719         int number_entries, param_length;
2720
2721         param_length = ntohs(resp->ph.param_length);
2722         seq = ntohl(resp->reset_req_seq_resp);
2723         if (seq == stcb->asoc.str_reset_seq_out) {
2724                 sctp_clean_up_stream_reset(stcb);
2725                 stcb->asoc.str_reset_seq_out++;
2726                 stcb->asoc.stream_reset_outstanding = 0;
2727                 tsn = ntohl(resp->reset_at_tsn);
2728                 number_entries = (param_length - sizeof(struct sctp_stream_reset_response))/sizeof(uint16_t);
2729                 tsn--;
2730                 if ((tsn == stcb->asoc.cumulative_tsn) ||
2731                     (compare_with_wrap(stcb->asoc.cumulative_tsn, tsn, MAX_TSN))) {
2732                         /* no problem we are good to go */
2733                         sctp_reset_in_stream(stcb, resp, number_entries);
2734                 } else {
2735                         /* So, we have a stream reset but there
2736                          * is pending data. We need to copy
2737                          * out the stream_reset and then queue
2738                          * any data = or > resp->reset_at_tsn
2739                          */
2740                         if (stcb->asoc.pending_reply != NULL) {
2741                                 /* FIX ME FIX ME
2742                                  * This IS WRONG. We need
2743                                  * to queue each of these up
2744                                  * and only release the chunks
2745                                  * for each reset that the cum-ack
2746                                  * goes by. This is a short cut.
2747                                  */
2748                                 FREE(stcb->asoc.pending_reply, M_PCB);
2749                                 stcb->asoc.pending_reply = NULL;
2750                         }
2751                         MALLOC(stcb->asoc.pending_reply, struct sctp_stream_reset_response *, param_length,
2752                                M_PCB, M_NOWAIT);
2753                         if (stcb->asoc.pending_reply == NULL)
2754                                 return;         /* XXX */
2755                         memcpy(stcb->asoc.pending_reply, resp, param_length);
2756                 }
2757
2758         } else {
2759                 /* duplicate */
2760 #ifdef SCTP_DEBUG
2761                 kprintf("Duplicate old stream reset resp next:%x this one:%x\n",
2762                        stcb->asoc.str_reset_seq_out, seq);
2763 #endif
2764         }
2765 }
2766
2767
2768 static void
2769 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct sctp_stream_reset_req *sr_req)
2770 {
2771         int chk_length, param_len;
2772         struct sctp_paramhdr *ph;
2773         /* now it may be a reset or a reset-response */
2774         struct sctp_stream_reset_request *req;
2775         struct sctp_stream_reset_response *resp;
2776         chk_length = ntohs(sr_req->ch.chunk_length);
2777
2778         ph = (struct sctp_paramhdr *)&sr_req->sr_req;
2779         while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_request)) {
2780                 param_len = ntohs(ph->param_length);
2781                 if (ntohs(ph->param_type) == SCTP_STR_RESET_REQUEST) {
2782                         /* this will send the ACK and do the reset if needed */
2783                         req = (struct sctp_stream_reset_request *)ph;
2784                         sctp_send_str_reset_ack(stcb, req);
2785                 } else if (ntohs(ph->param_type) == SCTP_STR_RESET_RESPONSE) {
2786                         /* Now here is a tricky one. We reset our receive side
2787                          * of the streams. But what happens if the peers
2788                          * next sending TSN is NOT equal to 1 minus our cumack?
2789                          * And if his cumack is not equal to our next one out - 1
2790                          * we have another problem if this is receprical.
2791                          */
2792                         resp = (struct sctp_stream_reset_response *)ph;
2793                         sctp_handle_stream_reset_response(stcb, resp);
2794                 }
2795                 ph = (struct sctp_paramhdr *)((caddr_t)ph + SCTP_SIZE32(param_len));
2796                 chk_length -= SCTP_SIZE32(param_len);
2797         }
2798 }
2799
2800 /*
2801  * Handle a router or endpoints report of a packet loss, there
2802  * are two ways to handle this, either we get the whole packet
2803  * and must disect it ourselves (possibly with truncation and
2804  * or corruption) or it is a summary from a middle box that did
2805  * the disectting for us.
2806  */
2807 static void
2808 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
2809     struct sctp_tcb *stcb, struct sctp_nets *net)
2810 {
2811         u_int32_t bottle_bw, on_queue;
2812         u_int16_t trunc_len;
2813         unsigned int chlen;
2814         unsigned int at;
2815         struct sctp_chunk_desc desc;
2816         struct sctp_chunkhdr *ch;
2817
2818         chlen = ntohs(cp->ch.chunk_length);
2819         chlen -= sizeof(struct sctp_pktdrop_chunk);
2820         /* XXX possible chlen underflow */
2821         if (chlen == 0) {
2822                 ch = NULL;
2823                 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
2824                         sctp_pegs[SCTP_PDRP_BWRPT]++;
2825         } else {
2826                 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
2827                 chlen -= sizeof(struct sctphdr);
2828                 /* XXX possible chlen underflow */
2829                 memset(&desc, 0, sizeof(desc));
2830         }
2831
2832         /* first update a rwnd possibly */
2833         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
2834                 /* From a peer, we get a rwnd report */
2835                 u_int32_t a_rwnd;
2836
2837                 sctp_pegs[SCTP_PDRP_FEHOS]++;
2838
2839                 bottle_bw = ntohl(cp->bottle_bw);
2840                 on_queue =  ntohl(cp->current_onq);
2841                 if (bottle_bw && on_queue) {
2842                         /* a rwnd report is in here */
2843                         if (bottle_bw > on_queue)
2844                                 a_rwnd = bottle_bw - on_queue;
2845                         else
2846                                 a_rwnd = 0;
2847
2848                         if (a_rwnd <= 0)
2849                                 stcb->asoc.peers_rwnd =  0;
2850                         else {
2851                                 if (a_rwnd > stcb->asoc.total_flight) {
2852                                         stcb->asoc.peers_rwnd =
2853                                             a_rwnd - stcb->asoc.total_flight;
2854                                 } else {
2855                                         stcb->asoc.peers_rwnd =  0;
2856                                 }
2857                                 if (stcb->asoc.peers_rwnd <
2858                                     stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
2859                                         /* SWS sender side engages */
2860                                         stcb->asoc.peers_rwnd = 0;
2861                                 }
2862                         }
2863                 }
2864         } else {
2865                 sctp_pegs[SCTP_PDRP_FMBOX]++;
2866         }
2867         trunc_len = (u_int16_t)ntohs(cp->trunc_len);
2868         /* now the chunks themselves */
2869         while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
2870                 desc.chunk_type = ch->chunk_type;
2871                 /* get amount we need to move */
2872                 at = ntohs(ch->chunk_length);
2873                 if (at < sizeof(struct sctp_chunkhdr)) {
2874                         /* corrupt chunk, maybe at the end? */
2875                         sctp_pegs[SCTP_PDRP_CRUPT]++;
2876                         break;
2877                 }
2878                 if (trunc_len == 0) {
2879                         /* we are supposed to have all of it */
2880                         if (at > chlen) {
2881                                 /* corrupt skip it */
2882                                 sctp_pegs[SCTP_PDRP_CRUPT]++;
2883                                 break;
2884                         }
2885                 } else {
2886                         /* is there enough of it left ? */
2887                         if (desc.chunk_type == SCTP_DATA) {
2888                                 if (chlen < (sizeof(struct sctp_data_chunk) +
2889                                              sizeof(desc.data_bytes))) {
2890                                         break;
2891                                 }
2892                         } else {
2893                                 if (chlen < sizeof(struct sctp_chunkhdr)) {
2894                                         break;
2895                                 }
2896                         }
2897                 }
2898                 if (desc.chunk_type == SCTP_DATA) {
2899                         /* can we get out the tsn? */
2900                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
2901                                 sctp_pegs[SCTP_PDRP_MB_DA]++;
2902
2903                         if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(u_int32_t)) ) {
2904                                 /* yep */
2905                                 struct sctp_data_chunk *dcp;
2906                                 u_int8_t  *ddp;
2907                                 unsigned int iii;
2908                                 dcp = (struct sctp_data_chunk *)ch;
2909                                 ddp = (u_int8_t *)(dcp + 1);
2910                                 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
2911                                         desc.data_bytes[iii] = ddp[iii];
2912                                 }
2913                                 desc.tsn_ifany = dcp->dp.tsn;
2914                         } else {
2915                                 /* nope we are done. */
2916                                 sctp_pegs[SCTP_PDRP_NEDAT]++;
2917                                 break;
2918                         }
2919                 } else {
2920                         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
2921                                 sctp_pegs[SCTP_PDRP_MB_CT]++;
2922                 }
2923
2924                 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
2925                         sctp_pegs[SCTP_PDRP_PDBRK]++;
2926                         break;
2927                 }
2928                 if (SCTP_SIZE32(at) > chlen) {
2929                         break;
2930                 }
2931                 chlen -= SCTP_SIZE32(at);
2932                 if (chlen < sizeof(struct sctp_chunkhdr)) {
2933                         /* done, none left */
2934                         break;
2935                 }
2936                 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
2937         }
2938
2939         /* now middle boxes in sat networks get a cwnd bump */
2940         if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
2941             (stcb->asoc.sat_t3_loss_recovery == 0) &&
2942             (stcb->asoc.sat_network)) {
2943                 /*
2944                  * This is debateable but for sat networks it makes sense
2945                  * Note if a T3 timer has went off, we will prohibit any
2946                  * changes to cwnd until we exit the t3 loss recovery.
2947                  */
2948                 u_int32_t bw_avail;
2949                 int rtt, incr;
2950 #ifdef SCTP_CWND_LOGGING
2951                 int old_cwnd=net->cwnd;
2952 #endif
2953                 /* need real RTT for this calc */
2954                 rtt = ((net->lastsa >> 2) + net->lastsv) >> 1;
2955                 /* get bottle neck bw */
2956                 bottle_bw = ntohl(cp->bottle_bw);
2957                 /* and whats on queue */
2958                 on_queue =  ntohl(cp->current_onq);
2959                 /*
2960                  * adjust the on-queue if our flight is more it could be
2961                  * that the router has not yet gotten data "in-flight" to it
2962                  */
2963                 if (on_queue < net->flight_size)
2964                         on_queue = net->flight_size;
2965
2966                 /* calculate the available space */
2967                 bw_avail = (bottle_bw*rtt)/1000;
2968                 if (bw_avail > bottle_bw) {
2969                         /*
2970                          * Cap the growth to no more than the bottle neck.
2971                          * This can happen as RTT slides up due to queues.
2972                          * It also means if you have more than a 1 second
2973                          * RTT with a empty queue you will be limited to
2974                          * the bottle_bw per second no matter if
2975                          * other points have 1/2 the RTT and you could
2976                          * get more out...
2977                          */
2978                         bw_avail = bottle_bw;
2979                 }
2980
2981                 if (on_queue > bw_avail) {
2982                         /*
2983                          * No room for anything else don't allow anything
2984                          * else to be "added to the fire".
2985                          */
2986                         int seg_inflight, seg_onqueue, my_portion;
2987                         net->partial_bytes_acked = 0;
2988
2989                         /* how much are we over queue size? */
2990                         incr = on_queue - bw_avail;
2991                         if (stcb->asoc.seen_a_sack_this_pkt) {
2992                                 /* undo any cwnd adjustment that
2993                                  * the sack might have made
2994                                  */
2995                                 net->cwnd = net->prev_cwnd;
2996                         }
2997
2998                         /* Now how much of that is mine? */
2999                         seg_inflight = net->flight_size / net->mtu;
3000                         seg_onqueue = on_queue / net->mtu;
3001                         my_portion = (incr * seg_inflight)/seg_onqueue;
3002
3003                         /* Have I made an adjustment already */
3004                         if (net->cwnd > net->flight_size) {
3005                                 /* for this flight I made an adjustment
3006                                  * we need to decrease the portion by a share
3007                                  * our previous adjustment.
3008                                  */
3009                                 int diff_adj;
3010                                 diff_adj = net->cwnd - net->flight_size;
3011                                 if (diff_adj > my_portion)
3012                                         my_portion = 0;
3013                                 else
3014                                         my_portion -= diff_adj;
3015                         }
3016
3017                         /* back down to the previous cwnd (assume
3018                          * we have had a sack before this packet). minus
3019                          * what ever portion of the overage is my fault.
3020                          */
3021                         net->cwnd -= my_portion;
3022
3023                         /* we will NOT back down more than 1 MTU */
3024                         if (net->cwnd <= net->mtu) {
3025                                 net->cwnd = net->mtu;
3026                         }
3027                         /* force into CA */
3028                         net->ssthresh = net->cwnd - 1;
3029                 } else {
3030                         /*
3031                          * Take 1/4 of the space left or
3032                          * max burst up .. whichever is less.
3033                          */
3034                         incr = min((bw_avail - on_queue) >> 2,
3035                             (int)stcb->asoc.max_burst * (int)net->mtu);
3036                         net->cwnd += incr;
3037                 }
3038                 if (net->cwnd > bw_avail) {
3039                         /* We can't exceed the pipe size */
3040                         net->cwnd = bw_avail;
3041                 }
3042                 if (net->cwnd < net->mtu) {
3043                         /* We always have 1 MTU */
3044                         net->cwnd = net->mtu;
3045                 }
3046 #ifdef SCTP_CWND_LOGGING
3047                 if (net->cwnd - old_cwnd != 0) {
3048                         /* log only changes */
3049                         sctp_log_cwnd(net, (net->cwnd - old_cwnd),
3050                             SCTP_CWND_LOG_FROM_SAT);
3051                 }
3052 #endif
3053         }
3054 }
3055
3056 extern int sctp_strict_init;
3057
3058 /*
3059  * handles all control chunks in a packet
3060  * inputs:
3061  * - m: mbuf chain, assumed to still contain IP/SCTP header
3062  * - stcb: is the tcb found for this packet
3063  * - offset: offset into the mbuf chain to first chunkhdr
3064  * - length: is the length of the complete packet
3065  * outputs:
3066  * - length: modified to remaining length after control processing
3067  * - netp: modified to new sctp_nets after cookie-echo processing
3068  * - return NULL to discard the packet (ie. no asoc, bad packet,...)
3069  *   otherwise return the tcb for this packet
3070  */
3071 static struct sctp_tcb *
3072 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
3073     struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
3074     struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen)
3075 {
3076         struct sctp_association *asoc;
3077         u_int32_t vtag_in;
3078         int num_chunks = 0;     /* number of control chunks processed */
3079         int chk_length;
3080         int ret;
3081
3082         /*
3083          * How big should this be, and should it be alloc'd?
3084          * Lets try the d-mtu-ceiling for now (2k) and that should
3085          * hopefully work ... until we get into jumbo grams and such..
3086          */
3087         u_int8_t chunk_buf[DEFAULT_CHUNK_BUFFER];
3088         struct sctp_tcb *locked_tcb = stcb;
3089
3090 #ifdef SCTP_DEBUG
3091         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
3092                 kprintf("sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
3093                        iphlen, *offset, length, stcb);
3094         }
3095 #endif /* SCTP_DEBUG */
3096
3097         /* validate chunk header length... */
3098         if (ntohs(ch->chunk_length) < sizeof(*ch)) {
3099                 return (NULL);
3100         }
3101
3102         /*
3103          * validate the verification tag
3104          */
3105 #ifdef SCTP_DEBUG
3106         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3107                 kprintf("sctp_process_control: validating vtags\n");
3108         }
3109 #endif /* SCTP_DEBUG */
3110         vtag_in = ntohl(sh->v_tag);
3111         if (ch->chunk_type == SCTP_INITIATION) {
3112                 if (vtag_in != 0) {
3113                         /* protocol error- silently discard... */
3114 #ifdef SCTP_DEBUG
3115                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3116                                 kprintf("sctp_process_control: INIT with vtag != 0\n");
3117                         }
3118 #endif /* SCTP_DEBUG */
3119                         sctp_pegs[SCTP_BAD_VTAGS]++;
3120                         if (locked_tcb)
3121                                 SCTP_TCB_UNLOCK(locked_tcb);
3122                         return (NULL);
3123                 }
3124         } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
3125                 /*
3126                  * first check if it's an ASCONF with an unknown src addr
3127                  * we need to look inside to find the association
3128                  */
3129                 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
3130                         stcb = sctp_findassociation_ep_asconf(m, iphlen,
3131                             *offset, sh, &inp, netp);
3132                 }
3133                 if (stcb == NULL) {
3134                         /* no association, so it's out of the blue... */
3135                         sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL);
3136 #ifdef SCTP_DEBUG
3137                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3138                                 kprintf("sctp_process_control: handling OOTB packet, chunk type=%xh\n",
3139                                        ch->chunk_type);
3140                         }
3141 #endif /* SCTP_DEBUG */
3142                         *offset = length;
3143                         if (locked_tcb)
3144                                 SCTP_TCB_UNLOCK(locked_tcb);
3145                         return (NULL);
3146                 }
3147                 asoc = &stcb->asoc;
3148                 /* ABORT and SHUTDOWN can use either v_tag... */
3149                 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
3150                     (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
3151                     (ch->chunk_type == SCTP_PACKET_DROPPED)) {
3152                         if ((vtag_in == asoc->my_vtag) ||
3153                             ((ch->chunk_flags & SCTP_HAD_NO_TCB) &&
3154                              (vtag_in == asoc->peer_vtag))) {
3155                                 /* this is valid */
3156                         } else {
3157                                 /* drop this packet... */
3158                                 sctp_pegs[SCTP_BAD_VTAGS]++;
3159                                 if (locked_tcb)
3160                                         SCTP_TCB_UNLOCK(locked_tcb);
3161                                 return (NULL);
3162                         }
3163                 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
3164                         if (vtag_in != asoc->my_vtag) {
3165                                 /*
3166                                  * this could be a stale SHUTDOWN-ACK or the
3167                                  * peer never got the SHUTDOWN-COMPLETE and
3168                                  * is still hung; we have started a new asoc
3169                                  * but it won't complete until the shutdown is
3170                                  * completed
3171                                  */
3172                                 if (locked_tcb)
3173                                         SCTP_TCB_UNLOCK(locked_tcb);
3174                                 sctp_handle_ootb(m, iphlen, *offset, sh, inp,
3175                                     NULL);
3176                                 return (NULL);
3177                         }
3178                 } else {
3179                         /* for all other chunks, vtag must match */
3180
3181                         if (vtag_in != asoc->my_vtag) {
3182                                 /* invalid vtag... */
3183 #ifdef SCTP_DEBUG
3184                                 if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3185                                         kprintf("invalid vtag: %xh, expect %xh\n", vtag_in, asoc->my_vtag);
3186                                 }
3187 #endif /* SCTP_DEBUG */
3188                                 sctp_pegs[SCTP_BAD_VTAGS]++;
3189                                 if (locked_tcb)
3190                                         SCTP_TCB_UNLOCK(locked_tcb);
3191                                 *offset = length;
3192                                 return (NULL);
3193                         }
3194                 }
3195         }  /* end if !SCTP_COOKIE_ECHO */
3196
3197 #ifdef SCTP_DEBUG
3198         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3199                 kprintf("sctp_process_control: vtags ok, processing ctrl chunks\n");
3200         }
3201 #endif /* SCTP_DEBUG */
3202
3203         /*
3204          * process all control chunks...
3205          */
3206         if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
3207             (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
3208             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
3209             /* implied cookie-ack.. we must have lost the ack */
3210             stcb->asoc.overall_error_count = 0;
3211             sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
3212         }
3213
3214         while (IS_SCTP_CONTROL(ch)) {
3215                 /* validate chunk length */
3216                 chk_length = ntohs(ch->chunk_length);
3217 #ifdef SCTP_DEBUG
3218                 if (sctp_debug_on & SCTP_DEBUG_INPUT2) {
3219                         kprintf("sctp_process_control: processing a chunk type=%u, len=%u\n", ch->chunk_type, chk_length);
3220                 }
3221 #endif /* SCTP_DEBUG */
3222                 if ((size_t)chk_length < sizeof(*ch) ||
3223                     (*offset + chk_length) > length) {
3224 #ifdef SCTP_DEBUG
3225                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3226                                 kprintf("sctp_process_control: chunk length invalid! *offset:%u, chk_length:%u > length:%u\n",
3227                                     *offset, length, chk_length);
3228                         }
3229 #endif /* SCTP_DEBUG */
3230                         *offset = length;
3231                         if (locked_tcb)
3232                                 SCTP_TCB_UNLOCK(locked_tcb);
3233                         return (NULL);
3234                 }
3235
3236                 /*
3237                  * INIT-ACK only gets the init ack "header" portion only
3238                  * because we don't have to process the peer's COOKIE.
3239                  * All others get a complete chunk.
3240                  */
3241                 if (ch->chunk_type == SCTP_INITIATION_ACK) {
3242                         /* get an init-ack chunk */
3243                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
3244                             sizeof(struct sctp_init_ack), chunk_buf);
3245                         if (ch == NULL) {
3246                                 *offset = length;
3247                                 if (locked_tcb)
3248                                         SCTP_TCB_UNLOCK(locked_tcb);
3249                                 return (NULL);
3250                         }
3251                 } else {
3252                         /* get a complete chunk... */
3253                         if ((size_t)chk_length > sizeof(chunk_buf)) {
3254                                 struct mbuf *oper;
3255                                 struct sctp_paramhdr *phdr;
3256                                 oper = NULL;
3257                                 MGETHDR(oper, MB_DONTWAIT, MT_HEADER);
3258                                 if (oper) {
3259                                         /* pre-reserve some space */
3260                                         oper->m_data +=
3261                                             sizeof(struct sctp_chunkhdr);
3262                                         phdr =
3263                                             mtod(oper, struct sctp_paramhdr *);
3264                                         phdr->param_type =
3265                                             htons(SCTP_CAUSE_OUT_OF_RESC);
3266                                         phdr->param_length =
3267                                             htons(sizeof(struct sctp_paramhdr));
3268                                         sctp_queue_op_err(stcb, oper);
3269                                 }
3270                                 if (locked_tcb)
3271                                         SCTP_TCB_UNLOCK(locked_tcb);
3272                                 return (NULL);
3273                         }
3274                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
3275                             chk_length, chunk_buf);
3276                         if (ch == NULL) {
3277                                 kprintf("sctp_process_control: Can't get the all data....\n");
3278                                 *offset = length;
3279                                 if (locked_tcb)
3280                                         SCTP_TCB_UNLOCK(locked_tcb);
3281                                 return (NULL);
3282                         }
3283
3284                 }
3285                 num_chunks++;
3286                 /* Save off the last place we got a control from */
3287                 if ((*netp) && stcb) {
3288                         stcb->asoc.last_control_chunk_from = *netp;
3289                 }
3290 #ifdef SCTP_AUDITING_ENABLED
3291                 sctp_audit_log(0xB0, ch->chunk_type);
3292 #endif
3293                 switch (ch->chunk_type) {
3294                 case SCTP_INITIATION:
3295                         /* must be first and only chunk */
3296 #ifdef SCTP_DEBUG
3297                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3298                                 kprintf("SCTP_INIT\n");
3299                         }
3300 #endif /* SCTP_DEBUG */
3301                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
3302                                 /* We are not interested anymore */
3303                                 if (locked_tcb)
3304                                         SCTP_TCB_UNLOCK(locked_tcb);
3305                                 if (LIST_FIRST(&inp->sctp_asoc_list) == NULL) {
3306                                         /* finish the job now */
3307                                         sctp_inpcb_free(inp, 1);
3308                                 }
3309                                 *offset = length;
3310                                 return (NULL);
3311                         }
3312                         if ((num_chunks > 1) ||
3313                             (sctp_strict_init && (length - *offset > SCTP_SIZE32(chk_length)))) {
3314                                 *offset = length;
3315                                 if (locked_tcb)
3316                                         SCTP_TCB_UNLOCK(locked_tcb);
3317                                 return (NULL);
3318                         }
3319                         if ((stcb != NULL) &&
3320                             (SCTP_GET_STATE(&stcb->asoc) ==
3321                             SCTP_STATE_SHUTDOWN_ACK_SENT)) {
3322                                 sctp_send_shutdown_ack(stcb,
3323                                     stcb->asoc.primary_destination);
3324                                 *offset = length;
3325                                 if (locked_tcb)
3326                                         SCTP_TCB_UNLOCK(locked_tcb);
3327                                 return (NULL);
3328                         }
3329                         sctp_handle_init(m, iphlen, *offset, sh,
3330                             (struct sctp_init_chunk *)ch, inp, stcb, *netp);
3331                         *offset = length;
3332                         if (locked_tcb)
3333                                 SCTP_TCB_UNLOCK(locked_tcb);
3334                         return (NULL);
3335                         break;
3336                 case SCTP_INITIATION_ACK:
3337                         /* must be first and only chunk */
3338 #ifdef SCTP_DEBUG
3339                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3340                                 kprintf("SCTP_INIT-ACK\n");
3341                         }
3342 #endif /* SCTP_DEBUG */
3343                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
3344                                 /* We are not interested anymore */
3345                                 if (locked_tcb)
3346                                         SCTP_TCB_UNLOCK(locked_tcb);
3347                                 *offset = length;
3348                                 if (stcb) {
3349                                         sctp_free_assoc(inp, stcb);
3350                                 } else {
3351                                         if (LIST_FIRST(&inp->sctp_asoc_list) == NULL) {
3352                                                 /* finish the job now */
3353                                                 sctp_inpcb_free(inp, 1);
3354                                         }
3355                                 }
3356                                 return (NULL);
3357                         }
3358                         if ((num_chunks > 1) ||
3359                             (sctp_strict_init && (length - *offset > SCTP_SIZE32(chk_length)))) {
3360 #ifdef SCTP_DEBUG
3361                                 if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3362                                         kprintf("Length is %d rounded chk_length:%d .. dropping\n",
3363                                             length - *offset,
3364                                             SCTP_SIZE32(chk_length));
3365                                 }
3366 #endif
3367                                 *offset = length;
3368                                 if (locked_tcb)
3369                                         SCTP_TCB_UNLOCK(locked_tcb);
3370                                 return (NULL);
3371                         }
3372                         ret = sctp_handle_init_ack(m, iphlen, *offset, sh,
3373                             (struct sctp_init_ack_chunk *)ch, stcb, *netp);
3374                         /*
3375                          * Special case, I must call the output routine
3376                          * to get the cookie echoed
3377                          */
3378                         if ((stcb) && ret == 0)
3379                                 sctp_chunk_output(stcb->sctp_ep, stcb, 2);
3380                         *offset = length;
3381 #ifdef SCTP_DEBUG
3382                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3383                                 kprintf("All done INIT-ACK processing\n");
3384                         }
3385 #endif
3386                         if (locked_tcb)
3387                                 SCTP_TCB_UNLOCK(locked_tcb);
3388                         return (NULL);
3389                         break;
3390                 case SCTP_SELECTIVE_ACK:
3391 #ifdef SCTP_DEBUG
3392                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3393                                 kprintf("SCTP_SACK\n");
3394                         }
3395 #endif /* SCTP_DEBUG */
3396                         sctp_pegs[SCTP_PEG_SACKS_SEEN]++;
3397                         {
3398                                 int abort_now = 0;
3399                                 stcb->asoc.seen_a_sack_this_pkt = 1;
3400                                 sctp_handle_sack((struct sctp_sack_chunk *)ch,
3401                                     stcb, *netp, &abort_now);
3402                                 if (abort_now) {
3403                                         /* ABORT signal from sack processing */
3404                                         *offset = length;
3405                                         return (NULL);
3406                                 }
3407                         }
3408                         break;
3409                 case SCTP_HEARTBEAT_REQUEST:
3410 #ifdef SCTP_DEBUG
3411                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3412                                 kprintf("SCTP_HEARTBEAT\n");
3413                         }
3414 #endif /* SCTP_DEBUG */
3415                         sctp_pegs[SCTP_HB_RECV]++;
3416                         sctp_send_heartbeat_ack(stcb, m, *offset, chk_length,
3417                             *netp);
3418
3419                         /* He's alive so give him credit */
3420                         stcb->asoc.overall_error_count = 0;
3421                         break;
3422                 case SCTP_HEARTBEAT_ACK:
3423 #ifdef SCTP_DEBUG
3424                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3425                                 kprintf("SCTP_HEARTBEAT-ACK\n");
3426                         }
3427 #endif /* SCTP_DEBUG */
3428
3429                         /* He's alive so give him credit */
3430                         stcb->asoc.overall_error_count = 0;
3431
3432                         sctp_pegs[SCTP_HB_ACK_RECV]++;
3433                         sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
3434                             stcb, *netp);
3435                         break;
3436                 case SCTP_ABORT_ASSOCIATION:
3437 #ifdef SCTP_DEBUG
3438                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3439                                 kprintf("SCTP_ABORT\n");
3440                         }
3441 #endif /* SCTP_DEBUG */
3442                         sctp_handle_abort((struct sctp_abort_chunk *)ch,
3443                             stcb, *netp);
3444                         *offset = length;
3445                         return (NULL);
3446                         break;
3447                 case SCTP_SHUTDOWN:
3448 #ifdef SCTP_DEBUG
3449                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3450                                 kprintf("SCTP_SHUTDOWN\n");
3451                         }
3452 #endif /* SCTP_DEBUG */
3453                        {
3454                                int abort_flag = 0;
3455                                sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
3456                                    stcb, *netp, &abort_flag);
3457                                if (abort_flag) {
3458                                        *offset = length;
3459                                        return (NULL);
3460                                }
3461                        }
3462                         break;
3463                 case SCTP_SHUTDOWN_ACK:
3464 #ifdef SCTP_DEBUG
3465                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3466                                 kprintf("SCTP_SHUTDOWN-ACK\n");
3467                         }
3468 #endif /* SCTP_DEBUG */
3469                         sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
3470                         *offset = length;
3471                         return (NULL);
3472                         break;
3473                 case SCTP_OPERATION_ERROR:
3474 #ifdef SCTP_DEBUG
3475                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3476                                 kprintf("SCTP_OP-ERR\n");
3477                         }
3478 #endif /* SCTP_DEBUG */
3479                         if (sctp_handle_error(ch, stcb, *netp) < 0) {
3480                                 *offset = length;
3481                                 return (NULL);
3482                         }
3483                         break;
3484                 case SCTP_COOKIE_ECHO:
3485 #ifdef SCTP_DEBUG
3486                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3487                                 kprintf("SCTP_COOKIE-ECHO stcb is %p\n", stcb);
3488                         }
3489 #endif /* SCTP_DEBUG */
3490                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
3491                                 /* We are not interested anymore */
3492                                 *offset = length;
3493                                 if (stcb) {
3494                                         sctp_free_assoc(inp, stcb);
3495                                 } else {
3496                                         if (LIST_FIRST(&inp->sctp_asoc_list) == NULL) {
3497                                                 /* finish the job now */
3498                                                 sctp_inpcb_free(inp, 1);
3499                                         }
3500                                 }
3501                                 return (NULL);
3502                         }
3503                         /*
3504                          * First are we accepting?
3505                          * We do this again here since it is possible
3506                          * that a previous endpoint WAS listening responded to
3507                          * a INIT-ACK and then closed. We opened and bound..
3508                          * and are now no longer listening.
3509                          */
3510                         if (((inp->sctp_flags & SCTP_PCB_FLAGS_ACCEPTING) == 0) ||
3511                             (inp->sctp_socket->so_qlimit == 0)) {
3512                                 sctp_abort_association(inp, stcb, m, iphlen, sh,
3513                                     NULL);
3514                                 *offset = length;
3515                                 return (NULL);
3516                         } else if (inp->sctp_flags & SCTP_PCB_FLAGS_ACCEPTING) {
3517                                 /* we are accepting so check limits like TCP */
3518                                 if (inp->sctp_socket->so_qlen >
3519                                     inp->sctp_socket->so_qlimit) {
3520                                         /* no space */
3521                                         struct mbuf *oper;
3522                                         struct sctp_paramhdr *phdr;
3523                                         oper = NULL;
3524                                         MGETHDR(oper, MB_DONTWAIT, MT_HEADER);
3525                                         if (oper) {
3526                                                 oper->m_len =
3527                                                     oper->m_pkthdr.len =
3528                                                     sizeof(struct sctp_paramhdr);
3529                                                 phdr = mtod(oper,
3530                                                     struct sctp_paramhdr *);
3531                                                 phdr->param_type =
3532                                                     htons(SCTP_CAUSE_OUT_OF_RESC);
3533                                                 phdr->param_length =
3534                                                     htons(sizeof(struct sctp_paramhdr));
3535                                         }
3536                                         sctp_abort_association(inp, stcb, m,
3537                                             iphlen, sh, oper);
3538                                         *offset = length;
3539                                         return (NULL);
3540                                 }
3541                         }
3542                         {
3543                                 struct mbuf *ret_buf;
3544                                 ret_buf = sctp_handle_cookie_echo(m, iphlen,
3545                                     *offset, sh,
3546                                     (struct sctp_cookie_echo_chunk *)ch, &inp,
3547                                     &stcb, netp);
3548 #ifdef SCTP_DEBUG
3549                                 if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3550                                         kprintf("ret_buf:%p length:%d off:%d\n",
3551                                             ret_buf, length, *offset);
3552                                 }
3553 #endif /* SCTP_DEBUG */
3554
3555                                 if (ret_buf == NULL) {
3556                                         if (locked_tcb) {
3557                                                 SCTP_TCB_UNLOCK(locked_tcb);
3558                                         }
3559 #ifdef SCTP_DEBUG
3560                                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3561                                                 kprintf("GAK, null buffer\n");
3562                                         }
3563 #endif /* SCTP_DEBUG */
3564                                         *offset = length;
3565                                         return (NULL);
3566                                 }
3567                                 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
3568                                         /*
3569                                          * Restart the timer if we have pending
3570                                          * data
3571                                          */
3572                                         struct sctp_tmit_chunk *chk;
3573                                         chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
3574                                         if (chk) {
3575                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND,
3576                                                     stcb->sctp_ep, stcb,
3577                                                     chk->whoTo);
3578                                         }
3579                                 }
3580                         }
3581                         break;
3582                 case SCTP_COOKIE_ACK:
3583 #ifdef SCTP_DEBUG
3584                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3585                                 kprintf("SCTP_COOKIE-ACK\n");
3586                         }
3587 #endif /* SCTP_DEBUG */
3588
3589                         if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
3590                                 /* We are not interested anymore */
3591                                 sctp_free_assoc(inp, stcb);
3592                                 *offset = length;
3593                                 return (NULL);
3594                         }
3595                         /* He's alive so give him credit */
3596                         stcb->asoc.overall_error_count = 0;
3597                         sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch,
3598                             stcb, *netp);
3599                         break;
3600                 case SCTP_ECN_ECHO:
3601 #ifdef SCTP_DEBUG
3602                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3603                                 kprintf("SCTP_ECN-ECHO\n");
3604                         }
3605 #endif /* SCTP_DEBUG */
3606                         /* He's alive so give him credit */
3607                         stcb->asoc.overall_error_count = 0;
3608                         sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
3609                             stcb);
3610                         break;
3611                 case SCTP_ECN_CWR:
3612 #ifdef SCTP_DEBUG
3613                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3614                                 kprintf("SCTP_ECN-CWR\n");
3615                         }
3616 #endif /* SCTP_DEBUG */
3617                         /* He's alive so give him credit */
3618                         stcb->asoc.overall_error_count = 0;
3619
3620                         sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb);
3621                         break;
3622                 case SCTP_SHUTDOWN_COMPLETE:
3623 #ifdef SCTP_DEBUG
3624                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3625                                 kprintf("SCTP_SHUTDOWN-COMPLETE\n");
3626                         }
3627 #endif /* SCTP_DEBUG */
3628                         /* must be first and only chunk */
3629                         if ((num_chunks > 1) ||
3630                             (length - *offset > SCTP_SIZE32(chk_length))) {
3631                                 *offset = length;
3632                                 if (locked_tcb)
3633                                         SCTP_TCB_UNLOCK(locked_tcb);
3634
3635                                 return (NULL);
3636                         }
3637                         sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
3638                             stcb, *netp);
3639                         *offset = length;
3640                         return (NULL);
3641                         break;
3642                 case SCTP_ASCONF:
3643 #ifdef SCTP_DEBUG
3644                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3645                                 kprintf("SCTP_ASCONF\n");
3646                         }
3647 #endif /* SCTP_DEBUG */
3648                         /* He's alive so give him credit */
3649                         stcb->asoc.overall_error_count = 0;
3650
3651                         sctp_handle_asconf(m, *offset,
3652                             (struct sctp_asconf_chunk *)ch, stcb, *netp);
3653                         break;
3654                 case SCTP_ASCONF_ACK:
3655 #ifdef SCTP_DEBUG
3656                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3657                                 kprintf("SCTP_ASCONF-ACK\n");
3658                         }
3659 #endif /* SCTP_DEBUG */
3660                         /* He's alive so give him credit */
3661                         stcb->asoc.overall_error_count = 0;
3662
3663                         sctp_handle_asconf_ack(m, *offset,
3664                             (struct sctp_asconf_ack_chunk *)ch, stcb, *netp);
3665                         break;
3666                 case SCTP_FORWARD_CUM_TSN:
3667 #ifdef SCTP_DEBUG
3668                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3669                                 kprintf("SCTP_FWD-TSN\n");
3670                         }
3671 #endif /* SCTP_DEBUG */
3672                         /* He's alive so give him credit */
3673                         {
3674                                 int abort_flag = 0;
3675                                 stcb->asoc.overall_error_count = 0;
3676                                 *fwd_tsn_seen = 1;
3677                                 sctp_handle_forward_tsn(stcb,
3678                                     (struct sctp_forward_tsn_chunk *)ch, &abort_flag);
3679                                 if (abort_flag) {
3680                                         *offset = length;
3681                                         return (NULL);
3682                                 } else {
3683                                         stcb->asoc.overall_error_count = 0;
3684                                 }
3685
3686                         }
3687                         break;
3688                 case SCTP_STREAM_RESET:
3689 #ifdef SCTP_DEBUG
3690                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3691                                 kprintf("SCTP_STREAM_RESET\n");
3692                         }
3693 #endif /* SCTP_DEBUG */
3694                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
3695                             chk_length, chunk_buf);
3696                         if (stcb->asoc.peer_supports_strreset == 0) {
3697                                 /* hmm, peer should have annonced this, but
3698                                  * we will turn it on since he is sending us
3699                                  * a stream reset.
3700                                  */
3701                                 stcb->asoc.peer_supports_strreset = 1;
3702                         }
3703                         sctp_handle_stream_reset(stcb, (struct sctp_stream_reset_req *)ch);
3704                         break;
3705                 case SCTP_PACKET_DROPPED:
3706 #ifdef SCTP_DEBUG
3707                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3708                                 kprintf("SCTP_PACKET_DROPPED\n");
3709                         }
3710 #endif /* SCTP_DEBUG */
3711                         /* re-get it all please */
3712                         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
3713                             chk_length, chunk_buf);
3714
3715                         sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
3716                             stcb, *netp);
3717
3718
3719                         break;
3720                 default:
3721                         /* it's an unknown chunk! */
3722                         if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
3723                                 struct mbuf *mm;
3724                                 struct sctp_paramhdr *phd;
3725                                 MGETHDR(mm, MB_DONTWAIT, MT_HEADER);
3726                                 if (mm) {
3727                                         phd = mtod(mm, struct sctp_paramhdr *);
3728                                         /* We cheat and use param type since we
3729                                          * did not bother to define a error
3730                                          * cause struct.
3731                                          * They are the same basic format with
3732                                          * different names.
3733                                          */
3734                                         phd->param_type =
3735                                             htons(SCTP_CAUSE_UNRECOG_CHUNK);
3736                                         phd->param_length =
3737                                             htons(chk_length + sizeof(*phd));
3738                                         mm->m_len = sizeof(*phd);
3739                                         mm->m_next = sctp_m_copym(m, *offset,
3740                                             SCTP_SIZE32(chk_length),
3741                                             MB_DONTWAIT);
3742                                         if (mm->m_next) {
3743                                                 mm->m_pkthdr.len =
3744                                                     SCTP_SIZE32(chk_length) +
3745                                                     sizeof(*phd);
3746                                                 sctp_queue_op_err(stcb, mm);
3747                                         } else {
3748                                                 sctp_m_freem(mm);
3749 #ifdef SCTP_DEBUG
3750                                                 if (sctp_debug_on &
3751                                                     SCTP_DEBUG_INPUT1) {
3752                                                         kprintf("Gak can't copy the chunk into operr %d bytes\n",
3753                                                             chk_length);
3754                                                 }
3755 #endif
3756                                         }
3757                                 }
3758 #ifdef SCTP_DEBUG
3759                                 else {
3760                                         if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
3761                                                 kprintf("Gak can't mgethdr for op-err of unrec chunk\n");
3762                                         }
3763                                 }
3764 #endif
3765                         }
3766                         if ((ch->chunk_type & 0x80) == 0) {
3767                                 /* discard this packet */
3768                                 *offset = length;
3769                                 return (stcb);
3770                         } /* else skip this bad chunk and continue... */
3771                         break;
3772                 } /* switch (ch->chunk_type) */
3773                 /* get the next chunk */
3774                 *offset += SCTP_SIZE32(chk_length);
3775                 if (*offset >= length) {
3776                         /* no more data left in the mbuf chain */
3777                         break;
3778                 }
3779                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
3780                     sizeof(struct sctp_chunkhdr), chunk_buf);
3781                 if (ch == NULL) {
3782                         if (locked_tcb)
3783                                 SCTP_TCB_UNLOCK(locked_tcb);
3784                         *offset = length;
3785                         return (NULL);
3786                 }
3787         } /* while */
3788         return (stcb);
3789 }
3790
3791
3792 /*
3793  * Process the ECN bits we have something set so
3794  * we must look to see if it is ECN(0) or ECN(1) or CE
3795  */
3796 static void
3797 sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net,
3798     u_int8_t ecn_bits)
3799 {
3800         if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) {
3801                 ;
3802         } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) {
3803                 /*
3804                  * we only add to the nonce sum for ECT1, ECT0
3805                  * does not change the NS bit (that we have
3806                  * yet to find a way to send it yet).
3807                  */
3808
3809                 /* ECN Nonce stuff */
3810                 stcb->asoc.receiver_nonce_sum++;
3811                 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM;
3812
3813                 /*
3814                  * Drag up the last_echo point if cumack is larger since we
3815                  * don't want the point falling way behind by more than 2^^31
3816                  * and then having it be incorrect.
3817                  */
3818                 if (compare_with_wrap(stcb->asoc.cumulative_tsn,
3819                     stcb->asoc.last_echo_tsn, MAX_TSN)) {
3820                         stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn;
3821                 }
3822         } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) {
3823                 /*
3824                  * Drag up the last_echo point if cumack is larger since we
3825                  * don't want the point falling way behind by more than 2^^31
3826                  * and then having it be incorrect.
3827                  */
3828                 if (compare_with_wrap(stcb->asoc.cumulative_tsn,
3829                     stcb->asoc.last_echo_tsn, MAX_TSN)) {
3830                         stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn;
3831                 }
3832         }
3833 }
3834
3835 static void
3836 sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net,
3837     u_int32_t high_tsn, u_int8_t ecn_bits)
3838 {
3839         if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) {
3840                 /*
3841                  * we possibly must notify the sender that a congestion
3842                  * window reduction is in order. We do this
3843                  * by adding a ECNE chunk to the output chunk
3844                  * queue. The incoming CWR will remove this chunk.
3845                  */
3846                 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn,
3847                     MAX_TSN)) {
3848                         /* Yep, we need to add a ECNE */
3849                         sctp_send_ecn_echo(stcb, net, high_tsn);
3850                         stcb->asoc.last_echo_tsn = high_tsn;
3851                 }
3852         }
3853 }
3854
3855 /*
3856  * common input chunk processing (v4 and v6)
3857  */
3858 int
3859 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset,
3860     int length, struct sctphdr *sh, struct sctp_chunkhdr *ch,
3861     struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net,
3862     u_int8_t ecn_bits)
3863 {
3864         /*
3865          * Control chunk processing
3866          */
3867         u_int32_t high_tsn;
3868         int fwd_tsn_seen = 0, data_processed = 0;
3869         struct mbuf *m = *mm;
3870         int abort_flag = 0;
3871
3872         sctp_pegs[SCTP_DATAGRAMS_RCVD]++;
3873 #ifdef SCTP_AUDITING_ENABLED
3874         sctp_audit_log(0xE0, 1);
3875         sctp_auditing(0, inp, stcb, net);
3876 #endif
3877
3878 #ifdef SCTP_DEBUG
3879         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
3880                 kprintf("Ok, Common input processing called, m:%p iphlen:%d offset:%d\n",
3881                        m, iphlen, offset);
3882         }
3883 #endif /* SCTP_DEBUG */
3884         if (IS_SCTP_CONTROL(ch)) {
3885                 /* process the control portion of the SCTP packet */
3886 #ifdef SCTP_DEBUG
3887                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
3888                         kprintf("Processing control\n");
3889                 }
3890 #endif /* SCTP_DEBUG */
3891
3892                 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch,
3893                     inp, stcb, &net, &fwd_tsn_seen);
3894         } else {
3895                 /*
3896                  * no control chunks, so pre-process DATA chunks
3897                  * (these checks are taken care of by control processing)
3898                  */
3899 #ifdef SCTP_DEBUG
3900                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
3901                         kprintf("No control present\n");
3902                 }
3903 #endif /* SCTP_DEBUG */
3904
3905                 if (stcb == NULL) {
3906                         /* out of the blue DATA chunk */
3907                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL);
3908                         return (1);
3909                 }
3910                 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
3911                         /* v_tag mismatch! */
3912                         sctp_pegs[SCTP_BAD_VTAGS]++;
3913                         SCTP_TCB_UNLOCK(stcb);
3914                         return (1);
3915                 }
3916         }
3917         if (stcb == NULL) {
3918                 /*
3919                  * no valid TCB for this packet,
3920                  * or we found it's a bad packet while processing control,
3921                  * or we're done with this packet (done or skip rest of data),
3922                  * so we drop it...
3923                  */
3924                 return (1);
3925         }
3926 #ifdef SCTP_DEBUG
3927         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
3928                 kprintf("Ok, control finished time to look for data (%d) offset:%d\n",
3929                        length, offset);
3930         }
3931 #endif /* SCTP_DEBUG */
3932         /*
3933          * DATA chunk processing
3934          */
3935         /* plow through the data chunks while length > offset */
3936         stcb->asoc.seen_a_sack_this_pkt = 0;
3937
3938         if (length > offset) {
3939                 int retval;
3940                 /*
3941                  * First check to make sure our state is correct.
3942                  * We would not get here unless we really did have a
3943                  * tag, so we don't abort if this happens, just
3944                  * dump the chunk silently.
3945                  */
3946                 switch (SCTP_GET_STATE(&stcb->asoc)) {
3947                 case SCTP_STATE_COOKIE_ECHOED:
3948                         /*
3949                          * we consider data with valid tags in
3950                          * this state shows us the cookie-ack was lost.
3951                          * Imply it was there.
3952                          */
3953                         stcb->asoc.overall_error_count = 0;
3954                         sctp_handle_cookie_ack(
3955                             (struct sctp_cookie_ack_chunk *)ch, stcb, net);
3956                         break;
3957                 case SCTP_STATE_COOKIE_WAIT:
3958                         /*
3959                          * We consider OOTB any data sent during asoc setup.
3960                          */
3961                         sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL);
3962                         SCTP_TCB_UNLOCK(stcb);
3963                         return (1);
3964                         break;
3965                 case SCTP_STATE_EMPTY:  /* should not happen */
3966                 case SCTP_STATE_INUSE:  /* should not happen */
3967                 case SCTP_STATE_SHUTDOWN_RECEIVED:  /* This is a peer error */
3968                 case SCTP_STATE_SHUTDOWN_ACK_SENT:
3969                 default:
3970 #ifdef SCTP_DEBUG
3971                         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
3972                                 kprintf("Got data in invalid state %d.. dropping\n", stcb->asoc.state);
3973                         }
3974 #endif
3975                         SCTP_TCB_UNLOCK(stcb);
3976                         return (1);
3977                         break;
3978                 case SCTP_STATE_OPEN:
3979                 case SCTP_STATE_SHUTDOWN_SENT:
3980                         break;
3981                 }
3982                 /* take care of ECN, part 1. */
3983                 if (stcb->asoc.ecn_allowed &&
3984                     (ecn_bits & (SCTP_ECT0_BIT|SCTP_ECT1_BIT)) ) {
3985                         sctp_process_ecn_marked_a(stcb, net, ecn_bits);
3986                 }
3987                 /* plow through the data chunks while length > offset */
3988                 retval = sctp_process_data(mm, iphlen, &offset, length, sh,
3989                     inp, stcb, net, &high_tsn);
3990                 if (retval == 2) {
3991                         /* The association aborted, NO UNLOCK needed
3992                          * since the association is destroyed.
3993                          */
3994                         return (0);
3995                 }
3996
3997                 data_processed = 1;
3998                 if (retval == 0) {
3999                         /* take care of ecn part 2. */
4000                         if (stcb->asoc.ecn_allowed && (ecn_bits & (SCTP_ECT0_BIT|SCTP_ECT1_BIT)) ) {
4001                                 sctp_process_ecn_marked_b(stcb, net, high_tsn, ecn_bits);
4002
4003                         }
4004                 }
4005
4006                 /*
4007                  * Anything important needs to have been m_copy'ed in
4008                  * process_data
4009                  */
4010         }
4011         if ((data_processed == 0) && (fwd_tsn_seen)) {
4012                 int was_a_gap = 0;
4013                 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map,
4014                                       stcb->asoc.cumulative_tsn, MAX_TSN)) {
4015                         /* there was a gap before this data was processed */
4016                         was_a_gap = 1;
4017                 }
4018                 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag);
4019                 if (abort_flag) {
4020                         /* Again, we aborted so NO UNLOCK needed */
4021                         return (0);
4022                 }
4023         }
4024         /* trigger send of any chunks in queue... */
4025 #ifdef SCTP_AUDITING_ENABLED
4026         sctp_audit_log(0xE0, 2);
4027         sctp_auditing(1, inp, stcb, net);
4028 #endif
4029 #ifdef SCTP_DEBUG
4030         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
4031                 kprintf("Check for chunk output prw:%d tqe:%d tf=%d\n",
4032                        stcb->asoc.peers_rwnd,
4033                        TAILQ_EMPTY(&stcb->asoc.control_send_queue),
4034                        stcb->asoc.total_flight);
4035         }
4036 #endif
4037         if (stcb->asoc.peers_rwnd > 0 ||
4038             !TAILQ_EMPTY(&stcb->asoc.control_send_queue) ||
4039             (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)) {
4040 #ifdef SCTP_DEBUG
4041                 if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
4042                         kprintf("Calling chunk OUTPUT\n");
4043                 }
4044 #endif
4045                 sctp_chunk_output(inp, stcb, 3);
4046 #ifdef SCTP_DEBUG
4047                 if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
4048                         kprintf("chunk OUTPUT returns\n");
4049                 }
4050 #endif
4051         }
4052
4053 #ifdef SCTP_AUDITING_ENABLED
4054         sctp_audit_log(0xE0, 3);
4055         sctp_auditing(2, inp, stcb, net);
4056 #endif
4057         SCTP_TCB_UNLOCK(stcb);
4058         return (0);
4059 }
4060
4061 #if defined(__OpenBSD__)
4062 static void
4063 sctp_saveopt(struct sctp_inpcb *inp, struct mbuf **mp, struct ip *ip,
4064     struct mbuf *m)
4065 {
4066         if (inp->ip_inp.inp.inp_flags & INP_RECVDSTADDR) {
4067                 *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
4068                     sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
4069                 if (*mp)
4070                         mp = &(*mp)->m_next;
4071         }
4072 }
4073 #endif
4074
4075 extern int sctp_no_csum_on_loopback;
4076
4077 int
4078 sctp_input(struct mbuf **mp, int *offp, int proto)
4079 {
4080         int iphlen;
4081         struct mbuf *m = *mp;
4082         u_int8_t ecn_bits;
4083         struct ip *ip;
4084         struct sctphdr *sh;
4085         struct sctp_inpcb *inp = NULL;
4086         struct mbuf *opts = 0;
4087 /*#ifdef INET6*/
4088 /* Don't think this is needed */
4089 /*      struct ip6_recvpktopts opts6;*/
4090 /*#endif INET6 */
4091
4092         u_int32_t check, calc_check;
4093         struct sctp_nets *net;
4094         struct sctp_tcb *stcb = NULL;
4095         struct sctp_chunkhdr *ch;
4096         int refcount_up = 0;
4097         int length, mlen, offset;
4098 #if defined(__OpenBSD__) && defined(IPSEC)
4099         struct inpcb *i_inp;
4100         struct m_tag *mtag;
4101         struct tdb_ident *tdbi;
4102         struct tdb *tdb;
4103         int error;
4104 #endif
4105
4106         iphlen = *offp;
4107         net = NULL;
4108         sctp_pegs[SCTP_INPKTS]++;
4109 #ifdef SCTP_DEBUG
4110         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
4111                 kprintf("V4 input gets a packet iphlen:%d pktlen:%d\n", iphlen, m->m_pkthdr.len);
4112         }
4113 #endif
4114 /*#ifdef INET6*/
4115 /* Don't think this is needed */
4116 /*      bzero(&opts6, sizeof(opts6));*/
4117 /*#endif INET6 */
4118
4119         /*
4120          * Strip IP options, we don't allow any in or out.
4121          */
4122         if ((size_t)iphlen > sizeof(struct ip)) {
4123                 ip_stripoptions(m);
4124                 iphlen = sizeof(struct ip);
4125         }
4126
4127         /*
4128          * Get IP, SCTP, and first chunk header together in first mbuf.
4129          */
4130         ip = mtod(m, struct ip *);
4131         offset = iphlen + sizeof(*sh) + sizeof(*ch);
4132         if (m->m_len < offset) {
4133                 if ((m = m_pullup(m, offset)) == 0) {
4134                         sctp_pegs[SCTP_HDR_DROPS]++;
4135                         return(IPPROTO_DONE);
4136                 }
4137                 ip = mtod(m, struct ip *);
4138         }
4139         sh = (struct sctphdr *)((caddr_t)ip + iphlen);
4140         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
4141
4142         /* SCTP does not allow broadcasts or multicasts */
4143 #if defined(__NetBSD__) || defined(__OpenBSD__)
4144         if (IN_MULTICAST(ip->ip_dst.s_addr))
4145 #else
4146         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)))
4147 #endif
4148         {
4149                 sctp_pegs[SCTP_IN_MCAST]++;
4150                 goto bad;
4151         }
4152         if (in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
4153                 sctp_pegs[SCTP_IN_MCAST]++;
4154                 goto bad;
4155         }
4156
4157         /* destination port of 0 is illegal, based on RFC2960. */
4158         if (sh->dest_port == 0) {
4159                 sctp_pegs[SCTP_HDR_DROPS]++;
4160                 goto bad;
4161         }
4162
4163         /* validate SCTP checksum */
4164         if ((sctp_no_csum_on_loopback == 0) ||
4165             (m->m_pkthdr.rcvif == NULL) ||
4166             (m->m_pkthdr.rcvif->if_type != IFT_LOOP)) {
4167                 /* we do NOT validate things from the loopback if the
4168                  * sysctl is set to 1.
4169                  */
4170                 check = sh->checksum;   /* save incoming checksum */
4171                 if ((check == 0) && (sctp_no_csum_on_loopback)) {
4172                         /* special hook for where we got a local address
4173                          * somehow routed across a non IFT_LOOP type interface
4174                          */
4175                         if (ip->ip_src.s_addr == ip->ip_dst.s_addr)
4176                                 goto sctp_skip_csum_4;
4177                 }
4178                 sh->checksum = 0;               /* prepare for calc */
4179                 calc_check = sctp_calculate_sum(m, &mlen, iphlen);
4180                 if (calc_check != check) {
4181 #ifdef SCTP_DEBUG
4182                         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
4183                                 kprintf("Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
4184                                        calc_check, check, m, mlen, iphlen);
4185                         }
4186 #endif
4187
4188                         stcb = sctp_findassociation_addr(m, iphlen,
4189                                                          offset - sizeof(*ch),
4190                                                          sh, ch, &inp, &net);
4191                         if ((inp) && (stcb)) {
4192                                 sctp_send_packet_dropped(stcb, net, m, iphlen,
4193                                                          1);
4194                                 sctp_chunk_output(inp, stcb, 2);
4195                         } else if ((inp != NULL) && (stcb == NULL)) {
4196                                 refcount_up = 1;
4197                         }
4198                         sctp_pegs[SCTP_BAD_CSUM]++;
4199                         goto bad;
4200                 }
4201                 sh->checksum = calc_check;
4202         } else {
4203         sctp_skip_csum_4:
4204                 mlen = m->m_pkthdr.len;
4205         }
4206         /* validate mbuf chain length with IP payload length */
4207 #if defined(__NetBSD__) || defined(__OpenBSD__)
4208         /* Open BSD gives us the len in network order, fix it */
4209         NTOHS(ip->ip_len);
4210 #endif
4211         if (mlen < (ip->ip_len - iphlen)) {
4212                 sctp_pegs[SCTP_HDR_DROPS]++;
4213                 goto bad;
4214         }
4215
4216         /*
4217          * Locate pcb and tcb for datagram
4218          * sctp_findassociation_addr() wants IP/SCTP/first chunk header...
4219          */
4220 #ifdef SCTP_DEBUG
4221         if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
4222                 kprintf("V4 find association\n");
4223         }
4224 #endif
4225
4226         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
4227             sh, ch, &inp, &net);
4228         /* inp's ref-count increased && stcb locked */
4229         if (inp == NULL) {
4230                 struct sctp_init_chunk *init_chk, chunk_buf;
4231
4232                 sctp_pegs[SCTP_NOPORTS]++;
4233 #ifdef ICMP_BANDLIM
4234                 /*
4235                  * we use the bandwidth limiting to protect against
4236                  * sending too many ABORTS all at once. In this case
4237                  * these count the same as an ICMP message.
4238                  */
4239                 if (badport_bandlim(0) < 0)
4240                         goto bad;
4241 #endif /* ICMP_BANDLIM */
4242 #ifdef SCTP_DEBUG
4243                 if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
4244                         kprintf("Sending a ABORT from packet entry!\n");
4245                 }
4246 #endif
4247                 if (ch->chunk_type == SCTP_INITIATION) {
4248                         /* we do a trick here to get the INIT tag,
4249                          * dig in and get the tag from the INIT and
4250                          * put it in the common header.
4251                          */
4252                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
4253                             iphlen + sizeof(*sh), sizeof(*init_chk),
4254                             (u_int8_t *)&chunk_buf);
4255                         if (init_chk != NULL)
4256                                 sh->v_tag = init_chk->init.initiate_tag;
4257                 }
4258                 sctp_send_abort(m, iphlen, sh, 0, NULL);
4259                 goto bad;
4260         } else if (stcb == NULL) {
4261                 refcount_up = 1;
4262         }
4263 #ifdef IPSEC
4264         /*
4265          * I very much doubt any of the IPSEC stuff will work but I have
4266          * no idea, so I will leave it in place.
4267          */
4268
4269 #ifdef __OpenBSD__
4270         /* FIX ME: this don't work... :) */
4271         {
4272             /* Find most recent IPsec tag */
4273             i_inp = &inp->ip_inp.inp;
4274             mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
4275             s = splnet();
4276             if (mtag != NULL) {
4277                     tdbi = (struct tdb_ident *)(mtag + 1);
4278                     tdb = gettdb(tdbi->spi, &tdbi->dst, tdbi->proto);
4279             } else
4280                     tdb = NULL;
4281             ipsp_spd_lookup(m, af, iphlen, &error, IPSP_DIRECTION_IN,
4282                             tdb, i_inp);
4283             if (error) {
4284                     splx(s);
4285                     sctp_pegs[SCTP_HDR_DROPS]++;
4286                     goto bad;
4287             }
4288
4289             /* Latch SA */
4290             if (i_inp->inp_tdb_in != tdb) {
4291                 if (tdb) {
4292                     tdb_add_inp(tdb, i_inp, 1);
4293                     if (i_inp->inp_ipo == NULL) {
4294                         i_inp->inp_ipo = ipsec_add_policy(i_inp, af,
4295                                                         IPSP_DIRECTION_OUT);
4296                         if (i_inp->inp_ipo == NULL) {
4297                             splx(s);
4298                             sctp_pegs[SCTP_HDR_DROPS]++;
4299                             goto bad;
4300                         }
4301                     }
4302                     if (i_inp->inp_ipo->ipo_dstid == NULL &&
4303                         tdb->tdb_srcid != NULL) {
4304                         i_inp->inp_ipo->ipo_dstid = tdb->tdb_srcid;
4305                         tdb->tdb_srcid->ref_count++;
4306                     }
4307                     if (i_inp->inp_ipsec_remotecred == NULL &&
4308                         tdb->tdb_remote_cred != NULL) {
4309                         i_inp->inp_ipsec_remotecred =
4310                             tdb->tdb_remote_cred;
4311                         tdb->tdb_remote_cred->ref_count++;
4312                     }
4313                     if (i_inp->inp_ipsec_remoteauth == NULL &&
4314                         tdb->tdb_remote_auth != NULL) {
4315                         i_inp->inp_ipsec_remoteauth =
4316                             tdb->tdb_remote_auth;
4317                         tdb->tdb_remote_auth->ref_count++;
4318                     }
4319                 } else { /* Just reset */
4320                     TAILQ_REMOVE(&i_inp->inp_tdb_in->tdb_inp_in, i_inp,
4321                                  inp_tdb_in_next);
4322                     i_inp->inp_tdb_in = NULL;
4323                 }
4324             }
4325             splx(s);
4326         }
4327 #else
4328         if (ipsec4_in_reject_so(m, inp->ip_inp.inp.inp_socket)) {
4329                 ipsecstat.in_polvio++;
4330                 sctp_pegs[SCTP_HDR_DROPS]++;
4331                 goto bad;
4332         }
4333 #endif
4334 #endif /* IPSEC */
4335
4336         /*
4337          * Construct sockaddr format source address.
4338          * Stuff source address and datagram in user buffer.
4339          */
4340         if ((inp->ip_inp.inp.inp_flags & INP_CONTROLOPTS)
4341 #ifndef __OpenBSD__
4342             || (inp->sctp_socket->so_options & SO_TIMESTAMP)
4343 #endif
4344                 ) {
4345 #ifdef __OpenBSD__
4346                 sctp_saveopt(inp, &opts, ip, m);
4347 #else
4348                 ip_savecontrol((struct inpcb *)inp, &opts, ip, m);
4349 #endif
4350         }
4351
4352         /*
4353          * common chunk processing
4354          */
4355 #if defined(__FreeBSD__)  || defined(__APPLE__) || defined(__DragonFly__)
4356         length = ip->ip_len + iphlen;
4357 #else
4358         length = ip->ip_len - (ip->ip_hl << 2) + iphlen;
4359 #endif
4360         offset -= sizeof(struct sctp_chunkhdr);
4361
4362         ecn_bits = ip->ip_tos;
4363         crit_enter();
4364         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
4365             inp, stcb, net, ecn_bits);
4366         /* inp's ref-count reduced && stcb unlocked */
4367         crit_exit();
4368         if (m) {
4369                 sctp_m_freem(m);
4370         }
4371         if (opts)
4372                 sctp_m_freem(opts);
4373
4374         if ((inp) && (refcount_up)) {
4375                 /* reduce ref-count */
4376                 SCTP_INP_WLOCK(inp);
4377                 SCTP_INP_DECR_REF(inp);
4378                 SCTP_INP_WUNLOCK(inp);
4379         }
4380
4381         return(IPPROTO_DONE);
4382 bad:
4383         if (stcb)
4384                 SCTP_TCB_UNLOCK(stcb);
4385
4386         if ((inp) && (refcount_up)) {
4387                 /* reduce ref-count */
4388                 SCTP_INP_WLOCK(inp);
4389                 SCTP_INP_DECR_REF(inp);
4390                 SCTP_INP_WUNLOCK(inp);
4391         }
4392
4393         if (m) {
4394                 sctp_m_freem(m);
4395         }
4396         if (opts)
4397                 sctp_m_freem(opts);
4398         return(IPPROTO_DONE);
4399 }