sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *   this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *   the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32 /*      $KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $      */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include <netinet/sctp_os.h>
  38 #include <sys/proc.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_var.h>
  42 #if defined(INET6)
  43 #include <netinet6/sctp6_var.h>
  44 #endif
  45 #include <netinet/sctp_sysctl.h>
  46 #include <netinet/sctp_output.h>
  47 #include <netinet/sctp_uio.h>
  48 #include <netinet/sctp_asconf.h>
  49 #include <netinet/sctputil.h>
  50 #include <netinet/sctp_indata.h>
  51 #include <netinet/sctp_timer.h>
  52 #include <netinet/sctp_auth.h>
  53 #include <netinet/sctp_input.h>
  54 #include <netinet/sctp_output.h>
  55 #include <netinet/sctp_bsd_addr.h>
  56 #include <netinet/sctp_crc32.h>
  57 #include <netinet/udp.h>
  58
  59 #ifdef IPSEC
  60 #include <netipsec/ipsec.h>
  61 #if defined(INET6)
  62 #include <netipsec/ipsec6.h>
  63 #endif                          /* INET6 */
  64 #endif                          /* IPSEC */
  65
  66 extern struct protosw inetsw[];
  67
  68 int
  69 sctp6_input(struct mbuf **i_pak, int *offp, int proto)
  70 {
  71         struct mbuf *m;
  72         struct ip6_hdr *ip6;
  73         struct sctphdr *sh;
  74         struct sctp_inpcb *in6p = NULL;
  75         struct sctp_nets *net;
  76         int refcount_up = 0;
  77         uint32_t vrf_id = 0;
  78
  79 #ifdef IPSEC
  80         struct inpcb *in6p_ip;
  81
  82 #endif
  83         struct sctp_chunkhdr *ch;
  84         int length, offset, iphlen;
  85         uint8_t ecn_bits;
  86         struct sctp_tcb *stcb = NULL;
  87         int pkt_len = 0;
  88
  89 #if !defined(SCTP_WITH_NO_CSUM)
  90         uint32_t check, calc_check;
  91
  92 #endif
  93         int off = *offp;
  94         uint16_t port = 0;
  95
  96         /* get the VRF and table id's */
  97         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  98                 SCTP_RELEASE_PKT(*i_pak);
  99                 return (-1);
 100         }
 101         m = SCTP_HEADER_TO_CHAIN(*i_pak);
 102         pkt_len = SCTP_HEADER_LEN((*i_pak));
 103
 104 #ifdef  SCTP_PACKET_LOGGING
 105         sctp_packet_log(m, pkt_len);
 106 #endif
 107         ip6 = mtod(m, struct ip6_hdr *);
 108         /* Ensure that (sctphdr + sctp_chunkhdr) in a row. */
 109         IP6_EXTHDR_GET(sh, struct sctphdr *, m, off,
 110             (int)(sizeof(*sh) + sizeof(*ch)));
 111         if (sh == NULL) {
 112                 SCTP_STAT_INCR(sctps_hdrops);
 113                 return IPPROTO_DONE;
 114         }
 115         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 116         iphlen = off;
 117         offset = iphlen + sizeof(*sh) + sizeof(*ch);
 118         SCTPDBG(SCTP_DEBUG_INPUT1,
 119             "sctp6_input() length:%d iphlen:%d\n", pkt_len, iphlen);
 120
 121
 122 #if defined(NFAITH) && NFAITH > 0
 123
 124         if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) {
 125                 /* XXX send icmp6 host/port unreach? */
 126                 goto bad;
 127         }
 128 #endif                          /* NFAITH defined and > 0 */
 129         SCTP_STAT_INCR(sctps_recvpackets);
 130         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 131         SCTPDBG(SCTP_DEBUG_INPUT1, "V6 input gets a packet iphlen:%d pktlen:%d\n",
 132             iphlen, pkt_len);
 133         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 134                 /* No multi-cast support in SCTP */
 135                 goto bad;
 136         }
 137         /* destination port of 0 is illegal, based on RFC2960. */
 138         if (sh->dest_port == 0)
 139                 goto bad;
 140
 141         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 142             "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
 143             m->m_pkthdr.len,
 144             if_name(m->m_pkthdr.rcvif),
 145             m->m_pkthdr.csum_flags);
 146 #if defined(SCTP_WITH_NO_CSUM)
 147         SCTP_STAT_INCR(sctps_recvnocrc);
 148 #else
 149         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 150                 SCTP_STAT_INCR(sctps_recvhwcrc);
 151                 goto sctp_skip_csum;
 152         }
 153         check = sh->checksum;   /* save incoming checksum */
 154         if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) &&
 155             (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))) {
 156                 SCTP_STAT_INCR(sctps_recvnocrc);
 157                 goto sctp_skip_csum;
 158         }
 159         sh->checksum = 0;       /* prepare for calc */
 160         calc_check = sctp_calculate_cksum(m, iphlen);
 161         SCTP_STAT_INCR(sctps_recvswcrc);
 162         if (calc_check != check) {
 163                 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p phlen:%d\n",
 164                     calc_check, check, m, iphlen);
 165                 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
 166                     sh, ch, &in6p, &net, vrf_id);
 167                 if ((net) && (port)) {
 168                         if (net->port == 0) {
 169                                 sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr));
 170                         }
 171                         net->port = port;
 172                 }
 173                 if ((net != NULL) && (m->m_flags & M_FLOWID)) {
 174                         net->flowid = m->m_pkthdr.flowid;
 175 #ifdef INVARIANTS
 176                         net->flowidset = 1;
 177 #endif
 178                 }
 179                 /* in6p's ref-count increased && stcb locked */
 180                 if ((in6p) && (stcb)) {
 181                         sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
 182                         sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
 183                 } else if ((in6p != NULL) && (stcb == NULL)) {
 184                         refcount_up = 1;
 185                 }
 186                 SCTP_STAT_INCR(sctps_badsum);
 187                 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
 188                 goto bad;
 189         }
 190         sh->checksum = calc_check;
 191
 192 sctp_skip_csum:
 193 #endif
 194         net = NULL;
 195         /*
 196          * Locate pcb and tcb for datagram sctp_findassociation_addr() wants
 197          * IP/SCTP/first chunk header...
 198          */
 199         stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
 200             sh, ch, &in6p, &net, vrf_id);
 201         if ((net) && (port)) {
 202                 if (net->port == 0) {
 203                         sctp_pathmtu_adjustment(in6p, stcb, net, net->mtu - sizeof(struct udphdr));
 204                 }
 205                 net->port = port;
 206         }
 207         if ((net != NULL) && (m->m_flags & M_FLOWID)) {
 208                 net->flowid = m->m_pkthdr.flowid;
 209 #ifdef INVARIANTS
 210                 net->flowidset = 1;
 211 #endif
 212         }
 213         /* in6p's ref-count increased */
 214         if (in6p == NULL) {
 215                 struct sctp_init_chunk *init_chk, chunk_buf;
 216
 217                 SCTP_STAT_INCR(sctps_noport);
 218                 if (ch->chunk_type == SCTP_INITIATION) {
 219                         /*
 220                          * we do a trick here to get the INIT tag, dig in
 221                          * and get the tag from the INIT and put it in the
 222                          * common header.
 223                          */
 224                         init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
 225                             iphlen + sizeof(*sh), sizeof(*init_chk),
 226                             (uint8_t *) & chunk_buf);
 227                         if (init_chk)
 228                                 sh->v_tag = init_chk->init.initiate_tag;
 229                         else
 230                                 sh->v_tag = 0;
 231                 }
 232                 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
 233                         sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port);
 234                         goto bad;
 235                 }
 236                 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
 237                         goto bad;
 238                 }
 239                 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
 240                         sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port);
 241                 goto bad;
 242         } else if (stcb == NULL) {
 243                 refcount_up = 1;
 244         }
 245 #ifdef IPSEC
 246         /*
 247          * Check AH/ESP integrity.
 248          */
 249         in6p_ip = (struct inpcb *)in6p;
 250         if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) {
 251 /* XXX */
 252                 MODULE_GLOBAL(ipsec6stat).in_polvio++;
 253                 goto bad;
 254         }
 255 #endif                          /* IPSEC */
 256
 257         /*
 258          * CONTROL chunk processing
 259          */
 260         offset -= sizeof(*ch);
 261         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 262
 263         /* Length now holds the total packet length payload + iphlen */
 264         length = ntohs(ip6->ip6_plen) + iphlen;
 265
 266         /* sa_ignore NO_NULL_CHK */
 267         sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
 268             in6p, stcb, net, ecn_bits, vrf_id, port);
 269         /* inp's ref-count reduced && stcb unlocked */
 270         /* XXX this stuff below gets moved to appropriate parts later... */
 271         if (m)
 272                 sctp_m_freem(m);
 273         if ((in6p) && refcount_up) {
 274                 /* reduce ref-count */
 275                 SCTP_INP_WLOCK(in6p);
 276                 SCTP_INP_DECR_REF(in6p);
 277                 SCTP_INP_WUNLOCK(in6p);
 278         }
 279         return IPPROTO_DONE;
 280
 281 bad:
 282         if (stcb) {
 283                 SCTP_TCB_UNLOCK(stcb);
 284         }
 285         if ((in6p) && refcount_up) {
 286                 /* reduce ref-count */
 287                 SCTP_INP_WLOCK(in6p);
 288                 SCTP_INP_DECR_REF(in6p);
 289                 SCTP_INP_WUNLOCK(in6p);
 290         }
 291         if (m)
 292                 sctp_m_freem(m);
 293         return IPPROTO_DONE;
 294 }
 295
 296
 297 static void
 298 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 299     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 300 {
 301         uint32_t nxtsz;
 302
 303         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 304             (icmp6 == NULL) || (sh == NULL)) {
 305                 goto out;
 306         }
 307         /* First do we even look at it? */
 308         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 309                 goto out;
 310
 311         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 312                 /* not PACKET TO BIG */
 313                 goto out;
 314         }
 315         /*
 316          * ok we need to look closely. We could even get smarter and look at
 317          * anyone that we sent to in case we get a different ICMP that tells
 318          * us there is no way to reach a host, but for this impl, all we
 319          * care about is MTU discovery.
 320          */
 321         nxtsz = ntohl(icmp6->icmp6_mtu);
 322         /* Stop any PMTU timer */
 323         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 324
 325         /* Adjust destination size limit */
 326         if (net->mtu > nxtsz) {
 327                 net->mtu = nxtsz;
 328                 if (net->port) {
 329                         net->mtu -= sizeof(struct udphdr);
 330                 }
 331         }
 332         /* now what about the ep? */
 333         if (stcb->asoc.smallest_mtu > nxtsz) {
 334                 struct sctp_tmit_chunk *chk;
 335
 336                 /* Adjust that too */
 337                 stcb->asoc.smallest_mtu = nxtsz;
 338                 /* now off to subtract IP_DF flag if needed */
 339
 340                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 341                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 342                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 343                         }
 344                 }
 345                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 346                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 347                                 /*
 348                                  * For this guy we also mark for immediate
 349                                  * resend since we sent to big of chunk
 350                                  */
 351                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 352                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 353                                         stcb->asoc.sent_queue_retran_cnt++;
 354                                 chk->sent = SCTP_DATAGRAM_RESEND;
 355                                 chk->rec.data.doing_fast_retransmit = 0;
 356
 357                                 chk->sent = SCTP_DATAGRAM_RESEND;
 358                                 /* Clear any time so NO RTT is being done */
 359                                 chk->sent_rcv_time.tv_sec = 0;
 360                                 chk->sent_rcv_time.tv_usec = 0;
 361                                 stcb->asoc.total_flight -= chk->send_size;
 362                                 net->flight_size -= chk->send_size;
 363                         }
 364                 }
 365         }
 366         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 367 out:
 368         if (stcb) {
 369                 SCTP_TCB_UNLOCK(stcb);
 370         }
 371 }
 372
 373
 374 void
 375 sctp6_notify(struct sctp_inpcb *inp,
 376     struct icmp6_hdr *icmph,
 377     struct sctphdr *sh,
 378     struct sockaddr *to,
 379     struct sctp_tcb *stcb,
 380     struct sctp_nets *net)
 381 {
 382 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 383         struct socket *so;
 384
 385 #endif
 386         /* protection */
 387         int reason;
 388
 389
 390         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 391             (sh == NULL) || (to == NULL)) {
 392                 if (stcb)
 393                         SCTP_TCB_UNLOCK(stcb);
 394                 return;
 395         }
 396         /* First job is to verify the vtag matches what I would send */
 397         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 398                 SCTP_TCB_UNLOCK(stcb);
 399                 return;
 400         }
 401         if (icmph->icmp6_type != ICMP_UNREACH) {
 402                 /* We only care about unreachable */
 403                 SCTP_TCB_UNLOCK(stcb);
 404                 return;
 405         }
 406         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 407             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 408             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 409             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 410             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 411             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 412             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 413             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 414
 415                 /*
 416                  * Hmm reachablity problems we must examine closely. If its
 417                  * not reachable, we may have lost a network. Or if there is
 418                  * NO protocol at the other end named SCTP. well we consider
 419                  * it a OOTB abort.
 420                  */
 421                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 422                         /* Ok that destination is NOT reachable */
 423                         SCTP_PRINTF("ICMP (thresh %d/%d) takes interface %p down\n",
 424                             net->error_count,
 425                             net->failure_threshold,
 426                             net);
 427
 428                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 429                         net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
 430                         /*
 431                          * JRS 5/14/07 - If a destination is unreachable,
 432                          * the PF bit is turned off.  This allows an
 433                          * unambiguous use of the PF bit for destinations
 434                          * that are reachable but potentially failed. If the
 435                          * destination is set to the unreachable state, also
 436                          * set the destination to the PF state.
 437                          */
 438                         /*
 439                          * Add debug message here if destination is not in
 440                          * PF state.
 441                          */
 442                         /* Stop any running T3 timers here? */
 443                         if ((stcb->asoc.sctp_cmt_on_off > 0) &&
 444                             (stcb->asoc.sctp_cmt_pf > 0)) {
 445                                 net->dest_state &= ~SCTP_ADDR_PF;
 446                                 SCTPDBG(SCTP_DEBUG_TIMER4, "Destination %p moved from PF to unreachable.\n",
 447                                     net);
 448                         }
 449                         net->error_count = net->failure_threshold + 1;
 450                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 451                             stcb, SCTP_FAILED_THRESHOLD,
 452                             (void *)net, SCTP_SO_NOT_LOCKED);
 453                 }
 454                 SCTP_TCB_UNLOCK(stcb);
 455         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 456             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 457                 /*
 458                  * Here the peer is either playing tricks on us, including
 459                  * an address that belongs to someone who does not support
 460                  * SCTP OR was a userland implementation that shutdown and
 461                  * now is dead. In either case treat it like a OOTB abort
 462                  * with no TCB
 463                  */
 464                 reason = SCTP_PEER_FAULTY;
 465                 sctp_abort_notification(stcb, reason, SCTP_SO_NOT_LOCKED);
 466 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 467                 so = SCTP_INP_SO(inp);
 468                 atomic_add_int(&stcb->asoc.refcnt, 1);
 469                 SCTP_TCB_UNLOCK(stcb);
 470                 SCTP_SOCKET_LOCK(so, 1);
 471                 SCTP_TCB_LOCK(stcb);
 472                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 473 #endif
 474                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 475 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 476                 SCTP_SOCKET_UNLOCK(so, 1);
 477                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 478 #endif
 479                 /* no need to unlock here, since the TCB is gone */
 480         } else {
 481                 SCTP_TCB_UNLOCK(stcb);
 482         }
 483 }
 484
 485
 486
 487 void
 488 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 489 {
 490         struct sctphdr sh;
 491         struct ip6ctlparam *ip6cp = NULL;
 492         uint32_t vrf_id;
 493
 494         vrf_id = SCTP_DEFAULT_VRFID;
 495
 496         if (pktdst->sa_family != AF_INET6 ||
 497             pktdst->sa_len != sizeof(struct sockaddr_in6))
 498                 return;
 499
 500         if ((unsigned)cmd >= PRC_NCMDS)
 501                 return;
 502         if (PRC_IS_REDIRECT(cmd)) {
 503                 d = NULL;
 504         } else if (inet6ctlerrmap[cmd] == 0) {
 505                 return;
 506         }
 507         /* if the parameter is from icmp6, decode it. */
 508         if (d != NULL) {
 509                 ip6cp = (struct ip6ctlparam *)d;
 510         } else {
 511                 ip6cp = (struct ip6ctlparam *)NULL;
 512         }
 513
 514         if (ip6cp) {
 515                 /*
 516                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 517                  * valid.
 518                  */
 519                 /* check if we can safely examine src and dst ports */
 520                 struct sctp_inpcb *inp = NULL;
 521                 struct sctp_tcb *stcb = NULL;
 522                 struct sctp_nets *net = NULL;
 523                 struct sockaddr_in6 final;
 524
 525                 if (ip6cp->ip6c_m == NULL)
 526                         return;
 527
 528                 bzero(&sh, sizeof(sh));
 529                 bzero(&final, sizeof(final));
 530                 inp = NULL;
 531                 net = NULL;
 532                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 533                     (caddr_t)&sh);
 534                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 535                 final.sin6_len = sizeof(final);
 536                 final.sin6_family = AF_INET6;
 537                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 538                 final.sin6_port = sh.dest_port;
 539                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src,
 540                     (struct sockaddr *)&final,
 541                     &inp, &net, 1, vrf_id);
 542                 /* inp's ref-count increased && stcb locked */
 543                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 544                         if (cmd == PRC_MSGSIZE) {
 545                                 sctp6_notify_mbuf(inp,
 546                                     ip6cp->ip6c_icmp6,
 547                                     &sh,
 548                                     stcb,
 549                                     net);
 550                                 /* inp's ref-count reduced && stcb unlocked */
 551                         } else {
 552                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 553                                     (struct sockaddr *)&final,
 554                                     stcb, net);
 555                                 /* inp's ref-count reduced && stcb unlocked */
 556                         }
 557                 } else {
 558                         if (PRC_IS_REDIRECT(cmd) && inp) {
 559                                 in6_rtchange((struct in6pcb *)inp,
 560                                     inet6ctlerrmap[cmd]);
 561                         }
 562                         if (inp) {
 563                                 /* reduce inp's ref-count */
 564                                 SCTP_INP_WLOCK(inp);
 565                                 SCTP_INP_DECR_REF(inp);
 566                                 SCTP_INP_WUNLOCK(inp);
 567                         }
 568                         if (stcb)
 569                                 SCTP_TCB_UNLOCK(stcb);
 570                 }
 571         }
 572 }
 573
 574 /*
 575  * this routine can probably be collasped into the one in sctp_userreq.c
 576  * since they do the same thing and now we lookup with a sockaddr
 577  */
 578 static int
 579 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 580 {
 581         struct xucred xuc;
 582         struct sockaddr_in6 addrs[2];
 583         struct sctp_inpcb *inp;
 584         struct sctp_nets *net;
 585         struct sctp_tcb *stcb;
 586         int error;
 587         uint32_t vrf_id;
 588
 589         vrf_id = SCTP_DEFAULT_VRFID;
 590
 591         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 592         if (error)
 593                 return (error);
 594
 595         if (req->newlen != sizeof(addrs)) {
 596                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 597                 return (EINVAL);
 598         }
 599         if (req->oldlen != sizeof(struct ucred)) {
 600                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 601                 return (EINVAL);
 602         }
 603         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 604         if (error)
 605                 return (error);
 606
 607         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]),
 608             sin6tosa(&addrs[1]),
 609             &inp, &net, 1, vrf_id);
 610         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 611                 if ((inp != NULL) && (stcb == NULL)) {
 612                         /* reduce ref-count */
 613                         SCTP_INP_WLOCK(inp);
 614                         SCTP_INP_DECR_REF(inp);
 615                         goto cred_can_cont;
 616                 }
 617                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 618                 error = ENOENT;
 619                 goto out;
 620         }
 621         SCTP_TCB_UNLOCK(stcb);
 622         /*
 623          * We use the write lock here, only since in the error leg we need
 624          * it. If we used RLOCK, then we would have to
 625          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 626          * Better to use higher wlock.
 627          */
 628         SCTP_INP_WLOCK(inp);
 629 cred_can_cont:
 630         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 631         if (error) {
 632                 SCTP_INP_WUNLOCK(inp);
 633                 goto out;
 634         }
 635         cru2x(inp->sctp_socket->so_cred, &xuc);
 636         SCTP_INP_WUNLOCK(inp);
 637         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 638 out:
 639         return (error);
 640 }
 641
 642 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 643     0, 0,
 644     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 645
 646
 647 /* This is the same as the sctp_abort() could be made common */
 648 static void
 649 sctp6_abort(struct socket *so)
 650 {
 651         struct sctp_inpcb *inp;
 652         uint32_t flags;
 653
 654         inp = (struct sctp_inpcb *)so->so_pcb;
 655         if (inp == 0) {
 656                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 657                 return;
 658         }
 659 sctp_must_try_again:
 660         flags = inp->sctp_flags;
 661 #ifdef SCTP_LOG_CLOSING
 662         sctp_log_closing(inp, NULL, 17);
 663 #endif
 664         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 665             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 666 #ifdef SCTP_LOG_CLOSING
 667                 sctp_log_closing(inp, NULL, 16);
 668 #endif
 669                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 670                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 671                 SOCK_LOCK(so);
 672                 SCTP_SB_CLEAR(so->so_snd);
 673                 /*
 674                  * same for the rcv ones, they are only here for the
 675                  * accounting/select.
 676                  */
 677                 SCTP_SB_CLEAR(so->so_rcv);
 678                 /* Now null out the reference, we are completely detached. */
 679                 so->so_pcb = NULL;
 680                 SOCK_UNLOCK(so);
 681         } else {
 682                 flags = inp->sctp_flags;
 683                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 684                         goto sctp_must_try_again;
 685                 }
 686         }
 687         return;
 688 }
 689
 690 static int
 691 sctp6_attach(struct socket *so, int proto, struct thread *p)
 692 {
 693         struct in6pcb *inp6;
 694         int error;
 695         struct sctp_inpcb *inp;
 696         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 697
 698         inp = (struct sctp_inpcb *)so->so_pcb;
 699         if (inp != NULL) {
 700                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 701                 return EINVAL;
 702         }
 703         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 704                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 705                 if (error)
 706                         return error;
 707         }
 708         error = sctp_inpcb_alloc(so, vrf_id);
 709         if (error)
 710                 return error;
 711         inp = (struct sctp_inpcb *)so->so_pcb;
 712         SCTP_INP_WLOCK(inp);
 713         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 714         inp6 = (struct in6pcb *)inp;
 715
 716         inp6->inp_vflag |= INP_IPV6;
 717         inp6->in6p_hops = -1;   /* use kernel default */
 718         inp6->in6p_cksum = -1;  /* just to be sure */
 719 #ifdef INET
 720         /*
 721          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 722          * socket as well, because the socket may be bound to an IPv6
 723          * wildcard address, which may match an IPv4-mapped IPv6 address.
 724          */
 725         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 726 #endif
 727         /*
 728          * Hmm what about the IPSEC stuff that is missing here but in
 729          * sctp_attach()?
 730          */
 731         SCTP_INP_WUNLOCK(inp);
 732         return 0;
 733 }
 734
 735 static int
 736 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 737 {
 738         struct sctp_inpcb *inp;
 739         struct in6pcb *inp6;
 740         int error;
 741
 742         inp = (struct sctp_inpcb *)so->so_pcb;
 743         if (inp == 0) {
 744                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 745                 return EINVAL;
 746         }
 747         if (addr) {
 748                 if ((addr->sa_family == AF_INET6) &&
 749                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
 750                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 751                         return EINVAL;
 752                 }
 753                 if ((addr->sa_family == AF_INET) &&
 754                     (addr->sa_len != sizeof(struct sockaddr_in))) {
 755                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 756                         return EINVAL;
 757                 }
 758         }
 759         inp6 = (struct in6pcb *)inp;
 760         inp6->inp_vflag &= ~INP_IPV4;
 761         inp6->inp_vflag |= INP_IPV6;
 762         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 763                 if (addr->sa_family == AF_INET) {
 764                         /* binding v4 addr to v6 socket, so reset flags */
 765                         inp6->inp_vflag |= INP_IPV4;
 766                         inp6->inp_vflag &= ~INP_IPV6;
 767                 } else {
 768                         struct sockaddr_in6 *sin6_p;
 769
 770                         sin6_p = (struct sockaddr_in6 *)addr;
 771
 772                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 773                                 inp6->inp_vflag |= INP_IPV4;
 774                         } else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 775                                 struct sockaddr_in sin;
 776
 777                                 in6_sin6_2_sin(&sin, sin6_p);
 778                                 inp6->inp_vflag |= INP_IPV4;
 779                                 inp6->inp_vflag &= ~INP_IPV6;
 780                                 error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 781                                 return error;
 782                         }
 783                 }
 784         } else if (addr != NULL) {
 785                 /* IPV6_V6ONLY socket */
 786                 if (addr->sa_family == AF_INET) {
 787                         /* can't bind v4 addr to v6 only socket! */
 788                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 789                         return EINVAL;
 790                 } else {
 791                         struct sockaddr_in6 *sin6_p;
 792
 793                         sin6_p = (struct sockaddr_in6 *)addr;
 794
 795                         if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 796                                 /* can't bind v4-mapped addrs either! */
 797                                 /* NOTE: we don't support SIIT */
 798                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 799                                 return EINVAL;
 800                         }
 801                 }
 802         }
 803         error = sctp_inpcb_bind(so, addr, NULL, p);
 804         return error;
 805 }
 806
 807
 808 static void
 809 sctp6_close(struct socket *so)
 810 {
 811         sctp_close(so);
 812 }
 813
 814 /* This could be made common with sctp_detach() since they are identical */
 815
 816 static
 817 int
 818 sctp6_disconnect(struct socket *so)
 819 {
 820         return (sctp_disconnect(so));
 821 }
 822
 823
 824 int
 825 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 826     struct mbuf *control, struct thread *p);
 827
 828
 829 static int
 830 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 831     struct mbuf *control, struct thread *p)
 832 {
 833         struct sctp_inpcb *inp;
 834         struct in6pcb *inp6;
 835
 836 #ifdef INET
 837         struct sockaddr_in6 *sin6;
 838
 839 #endif                          /* INET */
 840         /* No SPL needed since sctp_output does this */
 841
 842         inp = (struct sctp_inpcb *)so->so_pcb;
 843         if (inp == NULL) {
 844                 if (control) {
 845                         SCTP_RELEASE_PKT(control);
 846                         control = NULL;
 847                 }
 848                 SCTP_RELEASE_PKT(m);
 849                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 850                 return EINVAL;
 851         }
 852         inp6 = (struct in6pcb *)inp;
 853         /*
 854          * For the TCP model we may get a NULL addr, if we are a connected
 855          * socket thats ok.
 856          */
 857         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 858             (addr == NULL)) {
 859                 goto connected_type;
 860         }
 861         if (addr == NULL) {
 862                 SCTP_RELEASE_PKT(m);
 863                 if (control) {
 864                         SCTP_RELEASE_PKT(control);
 865                         control = NULL;
 866                 }
 867                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 868                 return (EDESTADDRREQ);
 869         }
 870 #ifdef INET
 871         sin6 = (struct sockaddr_in6 *)addr;
 872         if (SCTP_IPV6_V6ONLY(inp6)) {
 873                 /*
 874                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 875                  * v4 addr or v4-mapped addr
 876                  */
 877                 if (addr->sa_family == AF_INET) {
 878                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 879                         return EINVAL;
 880                 }
 881                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 882                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 883                         return EINVAL;
 884                 }
 885         }
 886         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 887                 if (!MODULE_GLOBAL(ip6_v6only)) {
 888                         struct sockaddr_in sin;
 889
 890                         /* convert v4-mapped into v4 addr and send */
 891                         in6_sin6_2_sin(&sin, sin6);
 892                         return sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
 893                             control, p);
 894                 } else {
 895                         /* mapped addresses aren't enabled */
 896                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 897                         return EINVAL;
 898                 }
 899         }
 900 #endif                          /* INET */
 901 connected_type:
 902         /* now what about control */
 903         if (control) {
 904                 if (inp->control) {
 905                         SCTP_PRINTF("huh? control set?\n");
 906                         SCTP_RELEASE_PKT(inp->control);
 907                         inp->control = NULL;
 908                 }
 909                 inp->control = control;
 910         }
 911         /* Place the data */
 912         if (inp->pkt) {
 913                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 914                 inp->pkt_last = m;
 915         } else {
 916                 inp->pkt_last = inp->pkt = m;
 917         }
 918         if (
 919         /* FreeBSD and MacOSX uses a flag passed */
 920             ((flags & PRUS_MORETOCOME) == 0)
 921             ) {
 922                 /*
 923                  * note with the current version this code will only be used
 924                  * by OpenBSD, NetBSD and FreeBSD have methods for
 925                  * re-defining sosend() to use sctp_sosend().  One can
 926                  * optionaly switch back to this code (by changing back the
 927                  * defininitions but this is not advisable.
 928                  */
 929                 int ret;
 930
 931                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 932                 inp->pkt = NULL;
 933                 inp->control = NULL;
 934                 return (ret);
 935         } else {
 936                 return (0);
 937         }
 938 }
 939
 940 static int
 941 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 942 {
 943         uint32_t vrf_id;
 944         int error = 0;
 945         struct sctp_inpcb *inp;
 946         struct in6pcb *inp6;
 947         struct sctp_tcb *stcb;
 948
 949 #ifdef INET
 950         struct sockaddr_in6 *sin6;
 951         struct sockaddr_storage ss;
 952
 953 #endif                          /* INET */
 954
 955         inp6 = (struct in6pcb *)so->so_pcb;
 956         inp = (struct sctp_inpcb *)so->so_pcb;
 957         if (inp == 0) {
 958                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 959                 return (ECONNRESET);    /* I made the same as TCP since we are
 960                                          * not setup? */
 961         }
 962         if (addr == NULL) {
 963                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 964                 return (EINVAL);
 965         }
 966         if ((addr->sa_family == AF_INET6) && (addr->sa_len != sizeof(struct sockaddr_in6))) {
 967                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 968                 return (EINVAL);
 969         }
 970         if ((addr->sa_family == AF_INET) && (addr->sa_len != sizeof(struct sockaddr_in))) {
 971                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 972                 return (EINVAL);
 973         }
 974         vrf_id = inp->def_vrf_id;
 975         SCTP_ASOC_CREATE_LOCK(inp);
 976         SCTP_INP_RLOCK(inp);
 977         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 978             SCTP_PCB_FLAGS_UNBOUND) {
 979                 /* Bind a ephemeral port */
 980                 SCTP_INP_RUNLOCK(inp);
 981                 error = sctp6_bind(so, NULL, p);
 982                 if (error) {
 983                         SCTP_ASOC_CREATE_UNLOCK(inp);
 984
 985                         return (error);
 986                 }
 987                 SCTP_INP_RLOCK(inp);
 988         }
 989         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 990             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 991                 /* We are already connected AND the TCP model */
 992                 SCTP_INP_RUNLOCK(inp);
 993                 SCTP_ASOC_CREATE_UNLOCK(inp);
 994                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 995                 return (EADDRINUSE);
 996         }
 997 #ifdef INET
 998         sin6 = (struct sockaddr_in6 *)addr;
 999         if (SCTP_IPV6_V6ONLY(inp6)) {
1000                 /*
1001                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
1002                  * addr or v4-mapped addr
1003                  */
1004                 if (addr->sa_family == AF_INET) {
1005                         SCTP_INP_RUNLOCK(inp);
1006                         SCTP_ASOC_CREATE_UNLOCK(inp);
1007                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1008                         return EINVAL;
1009                 }
1010                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1011                         SCTP_INP_RUNLOCK(inp);
1012                         SCTP_ASOC_CREATE_UNLOCK(inp);
1013                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1014                         return EINVAL;
1015                 }
1016         }
1017         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
1018                 if (!MODULE_GLOBAL(ip6_v6only)) {
1019                         /* convert v4-mapped into v4 addr */
1020                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
1021                         addr = (struct sockaddr *)&ss;
1022                 } else {
1023                         /* mapped addresses aren't enabled */
1024                         SCTP_INP_RUNLOCK(inp);
1025                         SCTP_ASOC_CREATE_UNLOCK(inp);
1026                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1027                         return EINVAL;
1028                 }
1029         } else
1030 #endif                          /* INET */
1031                 addr = addr;    /* for true v6 address case */
1032
1033         /* Now do we connect? */
1034         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1035                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
1036                 if (stcb) {
1037                         SCTP_TCB_UNLOCK(stcb);
1038                 }
1039                 SCTP_INP_RUNLOCK(inp);
1040         } else {
1041                 SCTP_INP_RUNLOCK(inp);
1042                 SCTP_INP_WLOCK(inp);
1043                 SCTP_INP_INCR_REF(inp);
1044                 SCTP_INP_WUNLOCK(inp);
1045                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
1046                 if (stcb == NULL) {
1047                         SCTP_INP_WLOCK(inp);
1048                         SCTP_INP_DECR_REF(inp);
1049                         SCTP_INP_WUNLOCK(inp);
1050                 }
1051         }
1052
1053         if (stcb != NULL) {
1054                 /* Already have or am bring up an association */
1055                 SCTP_ASOC_CREATE_UNLOCK(inp);
1056                 SCTP_TCB_UNLOCK(stcb);
1057                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
1058                 return (EALREADY);
1059         }
1060         /* We are GOOD to go */
1061         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
1062         SCTP_ASOC_CREATE_UNLOCK(inp);
1063         if (stcb == NULL) {
1064                 /* Gak! no memory */
1065                 return (error);
1066         }
1067         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
1068                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
1069                 /* Set the connected flag so we can queue data */
1070                 soisconnecting(so);
1071         }
1072         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
1073         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
1074
1075         /* initialize authentication parameters for the assoc */
1076         sctp_initialize_auth_params(inp, stcb);
1077
1078         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
1079         SCTP_TCB_UNLOCK(stcb);
1080         return error;
1081 }
1082
1083 static int
1084 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
1085 {
1086         struct sockaddr_in6 *sin6;
1087         struct sctp_inpcb *inp;
1088         uint32_t vrf_id;
1089         struct sctp_ifa *sctp_ifa;
1090
1091         int error;
1092
1093         /*
1094          * Do the malloc first in case it blocks.
1095          */
1096         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1097         if (sin6 == NULL)
1098                 return ENOMEM;
1099         sin6->sin6_family = AF_INET6;
1100         sin6->sin6_len = sizeof(*sin6);
1101
1102         inp = (struct sctp_inpcb *)so->so_pcb;
1103         if (inp == NULL) {
1104                 SCTP_FREE_SONAME(sin6);
1105                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1106                 return ECONNRESET;
1107         }
1108         SCTP_INP_RLOCK(inp);
1109         sin6->sin6_port = inp->sctp_lport;
1110         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1111                 /* For the bound all case you get back 0 */
1112                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1113                         struct sctp_tcb *stcb;
1114                         struct sockaddr_in6 *sin_a6;
1115                         struct sctp_nets *net;
1116                         int fnd;
1117
1118                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1119                         if (stcb == NULL) {
1120                                 goto notConn6;
1121                         }
1122                         fnd = 0;
1123                         sin_a6 = NULL;
1124                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1125                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1126                                 if (sin_a6 == NULL)
1127                                         /* this will make coverity happy */
1128                                         continue;
1129
1130                                 if (sin_a6->sin6_family == AF_INET6) {
1131                                         fnd = 1;
1132                                         break;
1133                                 }
1134                         }
1135                         if ((!fnd) || (sin_a6 == NULL)) {
1136                                 /* punt */
1137                                 goto notConn6;
1138                         }
1139                         vrf_id = inp->def_vrf_id;
1140                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1141                         if (sctp_ifa) {
1142                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1143                         }
1144                 } else {
1145                         /* For the bound all case you get back 0 */
1146         notConn6:
1147                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1148                 }
1149         } else {
1150                 /* Take the first IPv6 address in the list */
1151                 struct sctp_laddr *laddr;
1152                 int fnd = 0;
1153
1154                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1155                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1156                                 struct sockaddr_in6 *sin_a;
1157
1158                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1159                                 sin6->sin6_addr = sin_a->sin6_addr;
1160                                 fnd = 1;
1161                                 break;
1162                         }
1163                 }
1164                 if (!fnd) {
1165                         SCTP_FREE_SONAME(sin6);
1166                         SCTP_INP_RUNLOCK(inp);
1167                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1168                         return ENOENT;
1169                 }
1170         }
1171         SCTP_INP_RUNLOCK(inp);
1172         /* Scoping things for v6 */
1173         if ((error = sa6_recoverscope(sin6)) != 0) {
1174                 SCTP_FREE_SONAME(sin6);
1175                 return (error);
1176         }
1177         (*addr) = (struct sockaddr *)sin6;
1178         return (0);
1179 }
1180
1181 static int
1182 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1183 {
1184         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)*addr;
1185         int fnd;
1186         struct sockaddr_in6 *sin_a6;
1187         struct sctp_inpcb *inp;
1188         struct sctp_tcb *stcb;
1189         struct sctp_nets *net;
1190
1191         int error;
1192
1193         /*
1194          * Do the malloc first in case it blocks.
1195          */
1196         inp = (struct sctp_inpcb *)so->so_pcb;
1197         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) {
1198                 /* UDP type and listeners will drop out here */
1199                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1200                 return (ENOTCONN);
1201         }
1202         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1203         if (sin6 == NULL)
1204                 return (ENOMEM);
1205         sin6->sin6_family = AF_INET6;
1206         sin6->sin6_len = sizeof(*sin6);
1207
1208         /* We must recapture incase we blocked */
1209         inp = (struct sctp_inpcb *)so->so_pcb;
1210         if (inp == NULL) {
1211                 SCTP_FREE_SONAME(sin6);
1212                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1213                 return ECONNRESET;
1214         }
1215         SCTP_INP_RLOCK(inp);
1216         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1217         if (stcb) {
1218                 SCTP_TCB_LOCK(stcb);
1219         }
1220         SCTP_INP_RUNLOCK(inp);
1221         if (stcb == NULL) {
1222                 SCTP_FREE_SONAME(sin6);
1223                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1224                 return ECONNRESET;
1225         }
1226         fnd = 0;
1227         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1228                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1229                 if (sin_a6->sin6_family == AF_INET6) {
1230                         fnd = 1;
1231                         sin6->sin6_port = stcb->rport;
1232                         sin6->sin6_addr = sin_a6->sin6_addr;
1233                         break;
1234                 }
1235         }
1236         SCTP_TCB_UNLOCK(stcb);
1237         if (!fnd) {
1238                 /* No IPv4 address */
1239                 SCTP_FREE_SONAME(sin6);
1240                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1241                 return ENOENT;
1242         }
1243         if ((error = sa6_recoverscope(sin6)) != 0)
1244                 return (error);
1245         *addr = (struct sockaddr *)sin6;
1246         return (0);
1247 }
1248
1249 static int
1250 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1251 {
1252         struct sockaddr *addr;
1253         struct in6pcb *inp6 = sotoin6pcb(so);
1254         int error;
1255
1256         if (inp6 == NULL) {
1257                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1258                 return EINVAL;
1259         }
1260         /* allow v6 addresses precedence */
1261         error = sctp6_getaddr(so, nam);
1262         if (error) {
1263                 /* try v4 next if v6 failed */
1264                 error = sctp_ingetaddr(so, nam);
1265                 if (error) {
1266                         return (error);
1267                 }
1268                 addr = *nam;
1269                 /* if I'm V6ONLY, convert it to v4-mapped */
1270                 if (SCTP_IPV6_V6ONLY(inp6)) {
1271                         struct sockaddr_in6 sin6;
1272
1273                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1274                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1275
1276                 }
1277         }
1278         return (error);
1279 }
1280
1281
1282 static int
1283 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1284 {
1285         struct sockaddr *addr = *nam;
1286         struct in6pcb *inp6 = sotoin6pcb(so);
1287         int error;
1288
1289         if (inp6 == NULL) {
1290                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1291                 return EINVAL;
1292         }
1293         /* allow v6 addresses precedence */
1294         error = sctp6_peeraddr(so, nam);
1295         if (error) {
1296                 /* try v4 next if v6 failed */
1297                 error = sctp_peeraddr(so, nam);
1298                 if (error) {
1299                         return (error);
1300                 }
1301                 /* if I'm V6ONLY, convert it to v4-mapped */
1302                 if (SCTP_IPV6_V6ONLY(inp6)) {
1303                         struct sockaddr_in6 sin6;
1304
1305                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1306                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1307                 }
1308         }
1309         return error;
1310 }
1311
1312 struct pr_usrreqs sctp6_usrreqs = {
1313         .pru_abort = sctp6_abort,
1314         .pru_accept = sctp_accept,
1315         .pru_attach = sctp6_attach,
1316         .pru_bind = sctp6_bind,
1317         .pru_connect = sctp6_connect,
1318         .pru_control = in6_control,
1319         .pru_close = sctp6_close,
1320         .pru_detach = sctp6_close,
1321         .pru_sopoll = sopoll_generic,
1322         .pru_flush = sctp_flush,
1323         .pru_disconnect = sctp6_disconnect,
1324         .pru_listen = sctp_listen,
1325         .pru_peeraddr = sctp6_getpeeraddr,
1326         .pru_send = sctp6_send,
1327         .pru_shutdown = sctp_shutdown,
1328         .pru_sockaddr = sctp6_in6getaddr,
1329         .pru_sosend = sctp_sosend,
1330         .pru_soreceive = sctp_soreceive
1331 };