sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * a) Redistributions of source code must retain the above copyright notice,
  12  *    this list of conditions and the following disclaimer.
  13  *
  14  * b) Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the distribution.
  17  *
  18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <netinet/sctp_os.h>
  36 #ifdef INET6
  37 #include <sys/proc.h>
  38 #include <netinet/sctp_pcb.h>
  39 #include <netinet/sctp_header.h>
  40 #include <netinet/sctp_var.h>
  41 #include <netinet6/sctp6_var.h>
  42 #include <netinet/sctp_sysctl.h>
  43 #include <netinet/sctp_output.h>
  44 #include <netinet/sctp_uio.h>
  45 #include <netinet/sctp_asconf.h>
  46 #include <netinet/sctputil.h>
  47 #include <netinet/sctp_indata.h>
  48 #include <netinet/sctp_timer.h>
  49 #include <netinet/sctp_auth.h>
  50 #include <netinet/sctp_input.h>
  51 #include <netinet/sctp_output.h>
  52 #include <netinet/sctp_bsd_addr.h>
  53 #include <netinet/sctp_crc32.h>
  54 #include <netinet/icmp6.h>
  55 #include <netinet/udp.h>
  56
  57 int
  58 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
  59 {
  60         struct mbuf *m;
  61         int iphlen;
  62         uint32_t vrf_id;
  63         uint8_t ecn_bits;
  64         struct sockaddr_in6 src, dst;
  65         struct ip6_hdr *ip6;
  66         struct sctphdr *sh;
  67         struct sctp_chunkhdr *ch;
  68         int length, offset;
  69         uint8_t compute_crc;
  70         uint32_t mflowid;
  71         uint8_t mflowtype;
  72         uint16_t fibnum;
  73
  74         iphlen = *offp;
  75         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  76                 SCTP_RELEASE_PKT(*i_pak);
  77                 return (IPPROTO_DONE);
  78         }
  79         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  80 #ifdef SCTP_MBUF_LOGGING
  81         /* Log in any input mbufs */
  82         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  83                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
  84         }
  85 #endif
  86 #ifdef SCTP_PACKET_LOGGING
  87         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
  88                 sctp_packet_log(m);
  89         }
  90 #endif
  91         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
  92             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
  93             m->m_pkthdr.len,
  94             if_name(m->m_pkthdr.rcvif),
  95             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
  96         mflowid = m->m_pkthdr.flowid;
  97         mflowtype = M_HASHTYPE_GET(m);
  98         fibnum = M_GETFIB(m);
  99         SCTP_STAT_INCR(sctps_recvpackets);
 100         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 101         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 102         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 103         if (m->m_len < offset) {
 104                 m = m_pullup(m, offset);
 105                 if (m == NULL) {
 106                         SCTP_STAT_INCR(sctps_hdrops);
 107                         return (IPPROTO_DONE);
 108                 }
 109         }
 110         ip6 = mtod(m, struct ip6_hdr *);
 111         sh = (struct sctphdr *)(mtod(m, caddr_t)+iphlen);
 112         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 113         offset -= sizeof(struct sctp_chunkhdr);
 114         memset(&src, 0, sizeof(struct sockaddr_in6));
 115         src.sin6_family = AF_INET6;
 116         src.sin6_len = sizeof(struct sockaddr_in6);
 117         src.sin6_port = sh->src_port;
 118         src.sin6_addr = ip6->ip6_src;
 119         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 120                 goto out;
 121         }
 122         memset(&dst, 0, sizeof(struct sockaddr_in6));
 123         dst.sin6_family = AF_INET6;
 124         dst.sin6_len = sizeof(struct sockaddr_in6);
 125         dst.sin6_port = sh->dest_port;
 126         dst.sin6_addr = ip6->ip6_dst;
 127         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 128                 goto out;
 129         }
 130         length = ntohs(ip6->ip6_plen) + iphlen;
 131         /* Validate mbuf chain length with IP payload length. */
 132         if (SCTP_HEADER_LEN(m) != length) {
 133                 SCTPDBG(SCTP_DEBUG_INPUT1,
 134                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 135                 SCTP_STAT_INCR(sctps_hdrops);
 136                 goto out;
 137         }
 138         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 139                 goto out;
 140         }
 141         ecn_bits = IPV6_TRAFFIC_CLASS(ip6);
 142         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 143                 SCTP_STAT_INCR(sctps_recvhwcrc);
 144                 compute_crc = 0;
 145         } else {
 146                 SCTP_STAT_INCR(sctps_recvswcrc);
 147                 compute_crc = 1;
 148         }
 149         sctp_common_input_processing(&m, iphlen, offset, length,
 150             (struct sockaddr *)&src,
 151             (struct sockaddr *)&dst,
 152             sh, ch,
 153             compute_crc,
 154             ecn_bits,
 155             mflowtype, mflowid, fibnum,
 156             vrf_id, port);
 157 out:
 158         if (m) {
 159                 sctp_m_freem(m);
 160         }
 161         return (IPPROTO_DONE);
 162 }
 163
 164 int
 165 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
 166 {
 167         return (sctp6_input_with_port(i_pak, offp, 0));
 168 }
 169
 170 void
 171 sctp6_notify(struct sctp_inpcb *inp,
 172     struct sctp_tcb *stcb,
 173     struct sctp_nets *net,
 174     uint8_t icmp6_type,
 175     uint8_t icmp6_code,
 176     uint32_t next_mtu)
 177 {
 178         int timer_stopped;
 179
 180         switch (icmp6_type) {
 181         case ICMP6_DST_UNREACH:
 182                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
 183                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
 184                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
 185                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
 186                         /* Mark the net unreachable. */
 187                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 188                                 /* Ok that destination is not reachable */
 189                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 190                                 net->dest_state &= ~SCTP_ADDR_PF;
 191                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 192                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 193                         }
 194                 }
 195                 SCTP_TCB_UNLOCK(stcb);
 196                 break;
 197         case ICMP6_PARAM_PROB:
 198                 /* Treat it like an ABORT. */
 199                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
 200                         sctp_abort_notification(stcb, true, false, 0, NULL, SCTP_SO_NOT_LOCKED);
 201                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 202                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 203                 } else {
 204                         SCTP_TCB_UNLOCK(stcb);
 205                 }
 206                 break;
 207         case ICMP6_PACKET_TOO_BIG:
 208                 if (net->dest_state & SCTP_ADDR_NO_PMTUD) {
 209                         SCTP_TCB_UNLOCK(stcb);
 210                         break;
 211                 }
 212                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
 213                         timer_stopped = 1;
 214                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
 215                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
 216                 } else {
 217                         timer_stopped = 0;
 218                 }
 219                 /* Update the path MTU. */
 220                 if (net->port) {
 221                         next_mtu -= sizeof(struct udphdr);
 222                 }
 223                 if (net->mtu > next_mtu) {
 224                         net->mtu = next_mtu;
 225                         if (net->port) {
 226                                 sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu + sizeof(struct udphdr));
 227                         } else {
 228                                 sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu);
 229                         }
 230                 }
 231                 /* Update the association MTU */
 232                 if (stcb->asoc.smallest_mtu > next_mtu) {
 233                         sctp_pathmtu_adjustment(stcb, next_mtu, true);
 234                 }
 235                 /* Finally, start the PMTU timer if it was running before. */
 236                 if (timer_stopped) {
 237                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 238                 }
 239                 SCTP_TCB_UNLOCK(stcb);
 240                 break;
 241         default:
 242                 SCTP_TCB_UNLOCK(stcb);
 243                 break;
 244         }
 245 }
 246
 247 void
 248 sctp6_ctlinput(struct ip6ctlparam *ip6cp)
 249 {
 250         struct sctp_inpcb *inp;
 251         struct sctp_tcb *stcb;
 252         struct sctp_nets *net;
 253         struct sctphdr sh;
 254         struct sockaddr_in6 src, dst;
 255
 256         if (icmp6_errmap(ip6cp->ip6c_icmp6) == 0) {
 257                 return;
 258         }
 259
 260         /*
 261          * Check if we can safely examine the ports and the verification tag
 262          * of the SCTP common header.
 263          */
 264         if (ip6cp->ip6c_m->m_pkthdr.len <
 265             (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
 266                 return;
 267         }
 268
 269         /* Copy out the port numbers and the verification tag. */
 270         memset(&sh, 0, sizeof(sh));
 271         m_copydata(ip6cp->ip6c_m,
 272             ip6cp->ip6c_off,
 273             sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
 274             (caddr_t)&sh);
 275         memset(&src, 0, sizeof(struct sockaddr_in6));
 276         src.sin6_family = AF_INET6;
 277         src.sin6_len = sizeof(struct sockaddr_in6);
 278         src.sin6_port = sh.src_port;
 279         src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
 280         if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 281                 return;
 282         }
 283         memset(&dst, 0, sizeof(struct sockaddr_in6));
 284         dst.sin6_family = AF_INET6;
 285         dst.sin6_len = sizeof(struct sockaddr_in6);
 286         dst.sin6_port = sh.dest_port;
 287         dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
 288         if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 289                 return;
 290         }
 291         inp = NULL;
 292         net = NULL;
 293         stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
 294             (struct sockaddr *)&src,
 295             &inp, &net, 1, SCTP_DEFAULT_VRFID);
 296         if ((stcb != NULL) &&
 297             (net != NULL) &&
 298             (inp != NULL)) {
 299                 /* Check the verification tag */
 300                 if (ntohl(sh.v_tag) != 0) {
 301                         /*
 302                          * This must be the verification tag used for
 303                          * sending out packets. We don't consider packets
 304                          * reflecting the verification tag.
 305                          */
 306                         if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
 307                                 SCTP_TCB_UNLOCK(stcb);
 308                                 return;
 309                         }
 310                 } else {
 311                         if (ip6cp->ip6c_m->m_pkthdr.len >=
 312                             ip6cp->ip6c_off + sizeof(struct sctphdr) +
 313                             sizeof(struct sctp_chunkhdr) +
 314                             offsetof(struct sctp_init, a_rwnd)) {
 315                                 /*
 316                                  * In this case we can check if we got an
 317                                  * INIT chunk and if the initiate tag
 318                                  * matches.
 319                                  */
 320                                 uint32_t initiate_tag;
 321                                 uint8_t chunk_type;
 322
 323                                 m_copydata(ip6cp->ip6c_m,
 324                                     ip6cp->ip6c_off +
 325                                     sizeof(struct sctphdr),
 326                                     sizeof(uint8_t),
 327                                     (caddr_t)&chunk_type);
 328                                 m_copydata(ip6cp->ip6c_m,
 329                                     ip6cp->ip6c_off +
 330                                     sizeof(struct sctphdr) +
 331                                     sizeof(struct sctp_chunkhdr),
 332                                     sizeof(uint32_t),
 333                                     (caddr_t)&initiate_tag);
 334                                 if ((chunk_type != SCTP_INITIATION) ||
 335                                     (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
 336                                         SCTP_TCB_UNLOCK(stcb);
 337                                         return;
 338                                 }
 339                         } else {
 340                                 SCTP_TCB_UNLOCK(stcb);
 341                                 return;
 342                         }
 343                 }
 344                 sctp6_notify(inp, stcb, net,
 345                     ip6cp->ip6c_icmp6->icmp6_type,
 346                     ip6cp->ip6c_icmp6->icmp6_code,
 347                     ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
 348         } else {
 349                 if ((stcb == NULL) && (inp != NULL)) {
 350                         /* reduce inp's ref-count */
 351                         SCTP_INP_WLOCK(inp);
 352                         SCTP_INP_DECR_REF(inp);
 353                         SCTP_INP_WUNLOCK(inp);
 354                 }
 355                 if (stcb) {
 356                         SCTP_TCB_UNLOCK(stcb);
 357                 }
 358         }
 359 }
 360
 361 /*
 362  * this routine can probably be collapsed into the one in sctp_userreq.c
 363  * since they do the same thing and now we lookup with a sockaddr
 364  */
 365 static int
 366 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 367 {
 368         struct xucred xuc;
 369         struct sockaddr_in6 addrs[2];
 370         struct sctp_inpcb *inp;
 371         struct sctp_nets *net;
 372         struct sctp_tcb *stcb;
 373         int error;
 374         uint32_t vrf_id;
 375
 376         vrf_id = SCTP_DEFAULT_VRFID;
 377
 378         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 379         if (error)
 380                 return (error);
 381
 382         if (req->newlen != sizeof(addrs)) {
 383                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 384                 return (EINVAL);
 385         }
 386         if (req->oldlen != sizeof(struct ucred)) {
 387                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 388                 return (EINVAL);
 389         }
 390         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 391         if (error)
 392                 return (error);
 393
 394         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 395             sin6tosa(&addrs[0]),
 396             &inp, &net, 1, vrf_id);
 397         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 398                 if ((inp != NULL) && (stcb == NULL)) {
 399                         /* reduce ref-count */
 400                         SCTP_INP_WLOCK(inp);
 401                         SCTP_INP_DECR_REF(inp);
 402                         goto cred_can_cont;
 403                 }
 404                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 405                 error = ENOENT;
 406                 goto out;
 407         }
 408         SCTP_TCB_UNLOCK(stcb);
 409         /*
 410          * We use the write lock here, only since in the error leg we need
 411          * it. If we used RLOCK, then we would have to
 412          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 413          * Better to use higher wlock.
 414          */
 415         SCTP_INP_WLOCK(inp);
 416 cred_can_cont:
 417         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 418         if (error) {
 419                 SCTP_INP_WUNLOCK(inp);
 420                 goto out;
 421         }
 422         cru2x(inp->sctp_socket->so_cred, &xuc);
 423         SCTP_INP_WUNLOCK(inp);
 424         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 425 out:
 426         return (error);
 427 }
 428
 429 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred,
 430     CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
 431     0, 0, sctp6_getcred, "S,ucred",
 432     "Get the ucred of a SCTP6 connection");
 433
 434 static int
 435 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 436 {
 437         int error;
 438         struct sctp_inpcb *inp;
 439         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 440
 441         inp = (struct sctp_inpcb *)so->so_pcb;
 442         if (inp != NULL) {
 443                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 444                 return (EINVAL);
 445         }
 446
 447         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 448                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 449                 if (error)
 450                         return (error);
 451         }
 452         error = sctp_inpcb_alloc(so, vrf_id);
 453         if (error)
 454                 return (error);
 455         inp = (struct sctp_inpcb *)so->so_pcb;
 456         SCTP_INP_WLOCK(inp);
 457         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 458
 459         inp->ip_inp.inp.inp_vflag |= INP_IPV6;
 460         inp->ip_inp.inp.in6p_hops = -1; /* use kernel default */
 461         inp->ip_inp.inp.in6p_cksum = -1;        /* just to be sure */
 462 #ifdef INET
 463         /*
 464          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 465          * socket as well, because the socket may be bound to an IPv6
 466          * wildcard address, which may match an IPv4-mapped IPv6 address.
 467          */
 468         inp->ip_inp.inp.inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 469 #endif
 470         SCTP_INP_WUNLOCK(inp);
 471         return (0);
 472 }
 473
 474 static int
 475 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 476 {
 477         struct sctp_inpcb *inp;
 478         int error;
 479         u_char vflagsav;
 480
 481         inp = (struct sctp_inpcb *)so->so_pcb;
 482         if (inp == NULL) {
 483                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 484                 return (EINVAL);
 485         }
 486
 487         if (addr) {
 488                 switch (addr->sa_family) {
 489 #ifdef INET
 490                 case AF_INET:
 491                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 492                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 493                                 return (EINVAL);
 494                         }
 495                         break;
 496 #endif
 497 #ifdef INET6
 498                 case AF_INET6:
 499                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 500                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 501                                 return (EINVAL);
 502                         }
 503                         break;
 504 #endif
 505                 default:
 506                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 507                         return (EINVAL);
 508                 }
 509         }
 510         vflagsav = inp->ip_inp.inp.inp_vflag;
 511         inp->ip_inp.inp.inp_vflag &= ~INP_IPV4;
 512         inp->ip_inp.inp.inp_vflag |= INP_IPV6;
 513         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp) == 0)) {
 514                 switch (addr->sa_family) {
 515 #ifdef INET
 516                 case AF_INET:
 517                         /* binding v4 addr to v6 socket, so reset flags */
 518                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 519                         inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
 520                         break;
 521 #endif
 522 #ifdef INET6
 523                 case AF_INET6:
 524                         {
 525                                 struct sockaddr_in6 *sin6_p;
 526
 527                                 sin6_p = (struct sockaddr_in6 *)addr;
 528
 529                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 530                                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 531                                 }
 532 #ifdef INET
 533                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 534                                         struct sockaddr_in sin;
 535
 536                                         in6_sin6_2_sin(&sin, sin6_p);
 537                                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 538                                         inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
 539                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 540                                         goto out;
 541                                 }
 542 #endif
 543                                 break;
 544                         }
 545 #endif
 546                 default:
 547                         break;
 548                 }
 549         } else if (addr != NULL) {
 550                 struct sockaddr_in6 *sin6_p;
 551
 552                 /* IPV6_V6ONLY socket */
 553 #ifdef INET
 554                 if (addr->sa_family == AF_INET) {
 555                         /* can't bind v4 addr to v6 only socket! */
 556                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 557                         error = EINVAL;
 558                         goto out;
 559                 }
 560 #endif
 561                 sin6_p = (struct sockaddr_in6 *)addr;
 562
 563                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 564                         /* can't bind v4-mapped addrs either! */
 565                         /* NOTE: we don't support SIIT */
 566                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 567                         error = EINVAL;
 568                         goto out;
 569                 }
 570         }
 571         error = sctp_inpcb_bind(so, addr, NULL, p);
 572 out:
 573         if (error != 0)
 574                 inp->ip_inp.inp.inp_vflag = vflagsav;
 575         return (error);
 576 }
 577
 578 static void
 579 sctp6_close(struct socket *so)
 580 {
 581         sctp_close(so);
 582 }
 583
 584 /* This could be made common with sctp_detach() since they are identical */
 585
 586 int
 587 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 588     struct mbuf *control, struct thread *p);
 589
 590 static int
 591 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 592     struct mbuf *control, struct thread *p)
 593 {
 594         struct sctp_inpcb *inp;
 595
 596 #ifdef INET
 597         struct sockaddr_in6 *sin6;
 598 #endif                          /* INET */
 599         /* No SPL needed since sctp_output does this */
 600
 601         inp = (struct sctp_inpcb *)so->so_pcb;
 602         if (inp == NULL) {
 603                 if (control) {
 604                         SCTP_RELEASE_PKT(control);
 605                         control = NULL;
 606                 }
 607                 SCTP_RELEASE_PKT(m);
 608                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 609                 return (EINVAL);
 610         }
 611         /*
 612          * For the TCP model we may get a NULL addr, if we are a connected
 613          * socket thats ok.
 614          */
 615         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 616             (addr == NULL)) {
 617                 goto connected_type;
 618         }
 619         if (addr == NULL) {
 620                 SCTP_RELEASE_PKT(m);
 621                 if (control) {
 622                         SCTP_RELEASE_PKT(control);
 623                         control = NULL;
 624                 }
 625                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 626                 return (EDESTADDRREQ);
 627         }
 628         switch (addr->sa_family) {
 629 #ifdef INET
 630         case AF_INET:
 631                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 632                         if (control) {
 633                                 SCTP_RELEASE_PKT(control);
 634                                 control = NULL;
 635                         }
 636                         SCTP_RELEASE_PKT(m);
 637                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 638                         return (EINVAL);
 639                 }
 640                 break;
 641 #endif
 642 #ifdef INET6
 643         case AF_INET6:
 644                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 645                         if (control) {
 646                                 SCTP_RELEASE_PKT(control);
 647                                 control = NULL;
 648                         }
 649                         SCTP_RELEASE_PKT(m);
 650                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 651                         return (EINVAL);
 652                 }
 653                 break;
 654 #endif
 655         default:
 656                 if (control) {
 657                         SCTP_RELEASE_PKT(control);
 658                         control = NULL;
 659                 }
 660                 SCTP_RELEASE_PKT(m);
 661                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 662                 return (EINVAL);
 663         }
 664 #ifdef INET
 665         sin6 = (struct sockaddr_in6 *)addr;
 666         if (SCTP_IPV6_V6ONLY(inp)) {
 667                 /*
 668                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 669                  * v4 addr or v4-mapped addr
 670                  */
 671                 if (addr->sa_family == AF_INET) {
 672                         if (control) {
 673                                 SCTP_RELEASE_PKT(control);
 674                                 control = NULL;
 675                         }
 676                         SCTP_RELEASE_PKT(m);
 677                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 678                         return (EINVAL);
 679                 }
 680                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 681                         if (control) {
 682                                 SCTP_RELEASE_PKT(control);
 683                                 control = NULL;
 684                         }
 685                         SCTP_RELEASE_PKT(m);
 686                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 687                         return (EINVAL);
 688                 }
 689         }
 690         if ((addr->sa_family == AF_INET6) &&
 691             IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 692                 struct sockaddr_in sin;
 693
 694                 /* convert v4-mapped into v4 addr and send */
 695                 in6_sin6_2_sin(&sin, sin6);
 696                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 697         }
 698 #endif                          /* INET */
 699 connected_type:
 700         /* now what about control */
 701         if (control) {
 702                 if (inp->control) {
 703                         SCTP_PRINTF("huh? control set?\n");
 704                         SCTP_RELEASE_PKT(inp->control);
 705                         inp->control = NULL;
 706                 }
 707                 inp->control = control;
 708         }
 709         /* Place the data */
 710         if (inp->pkt) {
 711                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 712                 inp->pkt_last = m;
 713         } else {
 714                 inp->pkt_last = inp->pkt = m;
 715         }
 716         if (
 717         /* FreeBSD and MacOSX uses a flag passed */
 718             ((flags & PRUS_MORETOCOME) == 0)
 719             ) {
 720                 /*
 721                  * note with the current version this code will only be used
 722                  * by OpenBSD, NetBSD and FreeBSD have methods for
 723                  * re-defining sosend() to use sctp_sosend().  One can
 724                  * optionally switch back to this code (by changing back the
 725                  * definitions but this is not advisable.
 726                  */
 727                 struct epoch_tracker et;
 728                 int ret;
 729
 730                 NET_EPOCH_ENTER(et);
 731                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 732                 NET_EPOCH_EXIT(et);
 733                 inp->pkt = NULL;
 734                 inp->control = NULL;
 735                 return (ret);
 736         } else {
 737                 return (0);
 738         }
 739 }
 740
 741 static int
 742 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 743 {
 744         struct epoch_tracker et;
 745         uint32_t vrf_id;
 746         int error = 0;
 747         struct sctp_inpcb *inp;
 748         struct sctp_tcb *stcb;
 749 #ifdef INET
 750         struct sockaddr_in6 *sin6;
 751         union sctp_sockstore store;
 752 #endif
 753
 754         inp = (struct sctp_inpcb *)so->so_pcb;
 755         if (inp == NULL) {
 756                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 757                 return (ECONNRESET);    /* I made the same as TCP since we are
 758                                          * not setup? */
 759         }
 760         if (addr == NULL) {
 761                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 762                 return (EINVAL);
 763         }
 764         switch (addr->sa_family) {
 765 #ifdef INET
 766         case AF_INET:
 767                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 768                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 769                         return (EINVAL);
 770                 }
 771                 break;
 772 #endif
 773 #ifdef INET6
 774         case AF_INET6:
 775                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 776                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 777                         return (EINVAL);
 778                 }
 779                 break;
 780 #endif
 781         default:
 782                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 783                 return (EINVAL);
 784         }
 785
 786         vrf_id = inp->def_vrf_id;
 787         SCTP_ASOC_CREATE_LOCK(inp);
 788         SCTP_INP_RLOCK(inp);
 789         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 790             SCTP_PCB_FLAGS_UNBOUND) {
 791                 /* Bind a ephemeral port */
 792                 SCTP_INP_RUNLOCK(inp);
 793                 error = sctp6_bind(so, NULL, p);
 794                 if (error) {
 795                         SCTP_ASOC_CREATE_UNLOCK(inp);
 796
 797                         return (error);
 798                 }
 799                 SCTP_INP_RLOCK(inp);
 800         }
 801         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 802             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 803                 /* We are already connected AND the TCP model */
 804                 SCTP_INP_RUNLOCK(inp);
 805                 SCTP_ASOC_CREATE_UNLOCK(inp);
 806                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 807                 return (EADDRINUSE);
 808         }
 809 #ifdef INET
 810         sin6 = (struct sockaddr_in6 *)addr;
 811         if (SCTP_IPV6_V6ONLY(inp)) {
 812                 /*
 813                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 814                  * addr or v4-mapped addr
 815                  */
 816                 if (addr->sa_family == AF_INET) {
 817                         SCTP_INP_RUNLOCK(inp);
 818                         SCTP_ASOC_CREATE_UNLOCK(inp);
 819                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 820                         return (EINVAL);
 821                 }
 822                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 823                         SCTP_INP_RUNLOCK(inp);
 824                         SCTP_ASOC_CREATE_UNLOCK(inp);
 825                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 826                         return (EINVAL);
 827                 }
 828         }
 829         if ((addr->sa_family == AF_INET6) &&
 830             IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 831                 /* convert v4-mapped into v4 addr */
 832                 in6_sin6_2_sin(&store.sin, sin6);
 833                 addr = &store.sa;
 834         }
 835 #endif                          /* INET */
 836         /* Now do we connect? */
 837         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 838                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 839                 if (stcb) {
 840                         SCTP_TCB_LOCK(stcb);
 841                 }
 842                 SCTP_INP_RUNLOCK(inp);
 843         } else {
 844                 SCTP_INP_RUNLOCK(inp);
 845                 SCTP_INP_WLOCK(inp);
 846                 SCTP_INP_INCR_REF(inp);
 847                 SCTP_INP_WUNLOCK(inp);
 848                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 849                 if (stcb == NULL) {
 850                         SCTP_INP_WLOCK(inp);
 851                         SCTP_INP_DECR_REF(inp);
 852                         SCTP_INP_WUNLOCK(inp);
 853                 }
 854         }
 855
 856         if (stcb != NULL) {
 857                 /* Already have or am bring up an association */
 858                 SCTP_ASOC_CREATE_UNLOCK(inp);
 859                 SCTP_TCB_UNLOCK(stcb);
 860                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 861                 return (EALREADY);
 862         }
 863         /* We are GOOD to go */
 864         stcb = sctp_aloc_assoc_connected(inp, addr, &error, 0, 0, vrf_id,
 865             inp->sctp_ep.pre_open_stream_count,
 866             inp->sctp_ep.port, p,
 867             SCTP_INITIALIZE_AUTH_PARAMS);
 868         SCTP_ASOC_CREATE_UNLOCK(inp);
 869         if (stcb == NULL) {
 870                 /* Gak! no memory */
 871                 return (error);
 872         }
 873         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 874         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 875         NET_EPOCH_ENTER(et);
 876         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 877         SCTP_TCB_UNLOCK(stcb);
 878         NET_EPOCH_EXIT(et);
 879         return (error);
 880 }
 881
 882 static int
 883 sctp6_getaddr(struct socket *so, struct sockaddr *sa)
 884 {
 885         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 886         struct sctp_inpcb *inp;
 887         uint32_t vrf_id;
 888         struct sctp_ifa *sctp_ifa;
 889         int error;
 890
 891         *sin6 = (struct sockaddr_in6 ){
 892                 .sin6_len = sizeof(struct sockaddr_in6),
 893                 .sin6_family = AF_INET6,
 894         };
 895
 896         inp = (struct sctp_inpcb *)so->so_pcb;
 897         if (inp == NULL) {
 898                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 899                 return (ECONNRESET);
 900         }
 901         SCTP_INP_RLOCK(inp);
 902         sin6->sin6_port = inp->sctp_lport;
 903         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 904                 /* For the bound all case you get back 0 */
 905                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 906                         struct sctp_tcb *stcb;
 907                         struct sockaddr_in6 *sin_a6;
 908                         struct sctp_nets *net;
 909                         int fnd;
 910
 911                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 912                         if (stcb == NULL) {
 913                                 SCTP_INP_RUNLOCK(inp);
 914                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 915                                 return (ENOENT);
 916                         }
 917                         fnd = 0;
 918                         sin_a6 = NULL;
 919                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 920                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 921                                 if (sin_a6 == NULL)
 922                                         /* this will make coverity happy */
 923                                         continue;
 924
 925                                 if (sin_a6->sin6_family == AF_INET6) {
 926                                         fnd = 1;
 927                                         break;
 928                                 }
 929                         }
 930                         if ((!fnd) || (sin_a6 == NULL)) {
 931                                 /* punt */
 932                                 SCTP_INP_RUNLOCK(inp);
 933                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 934                                 return (ENOENT);
 935                         }
 936                         vrf_id = inp->def_vrf_id;
 937                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
 938                         if (sctp_ifa) {
 939                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
 940                         }
 941                 } else {
 942                         /* For the bound all case you get back 0 */
 943                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
 944                 }
 945         } else {
 946                 /* Take the first IPv6 address in the list */
 947                 struct sctp_laddr *laddr;
 948                 int fnd = 0;
 949
 950                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 951                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
 952                                 struct sockaddr_in6 *sin_a;
 953
 954                                 sin_a = &laddr->ifa->address.sin6;
 955                                 sin6->sin6_addr = sin_a->sin6_addr;
 956                                 fnd = 1;
 957                                 break;
 958                         }
 959                 }
 960                 if (!fnd) {
 961                         SCTP_INP_RUNLOCK(inp);
 962                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 963                         return (ENOENT);
 964                 }
 965         }
 966         SCTP_INP_RUNLOCK(inp);
 967         /* Scoping things for v6 */
 968         if ((error = sa6_recoverscope(sin6)) != 0) {
 969                 return (error);
 970         }
 971
 972         return (0);
 973 }
 974
 975 static int
 976 sctp6_peeraddr(struct socket *so, struct sockaddr *sa)
 977 {
 978         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 979         int fnd;
 980         struct sockaddr_in6 *sin_a6;
 981         struct sctp_inpcb *inp;
 982         struct sctp_tcb *stcb;
 983         struct sctp_nets *net;
 984         int error;
 985
 986         *sin6 = (struct sockaddr_in6 ){
 987                 .sin6_len = sizeof(struct sockaddr_in6),
 988                 .sin6_family = AF_INET6,
 989         };
 990
 991         inp = (struct sctp_inpcb *)so->so_pcb;
 992         if ((inp == NULL) ||
 993             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
 994                 /* UDP type and listeners will drop out here */
 995                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
 996                 return (ENOTCONN);
 997         }
 998         SCTP_INP_RLOCK(inp);
 999         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1000         if (stcb) {
1001                 SCTP_TCB_LOCK(stcb);
1002         }
1003         SCTP_INP_RUNLOCK(inp);
1004         if (stcb == NULL) {
1005                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1006                 return (ECONNRESET);
1007         }
1008         fnd = 0;
1009         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1010                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1011                 if (sin_a6->sin6_family == AF_INET6) {
1012                         fnd = 1;
1013                         sin6->sin6_port = stcb->rport;
1014                         sin6->sin6_addr = sin_a6->sin6_addr;
1015                         break;
1016                 }
1017         }
1018         SCTP_TCB_UNLOCK(stcb);
1019         if (!fnd) {
1020                 /* No IPv4 address */
1021                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1022                 return (ENOENT);
1023         }
1024         if ((error = sa6_recoverscope(sin6)) != 0) {
1025                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1026                 return (error);
1027         }
1028
1029         return (0);
1030 }
1031
1032 static int
1033 sctp6_in6getaddr(struct socket *so, struct sockaddr *sa)
1034 {
1035         struct inpcb *inp = sotoinpcb(so);
1036         int error;
1037
1038         if (inp == NULL) {
1039                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1040                 return (EINVAL);
1041         }
1042
1043         /* allow v6 addresses precedence */
1044         error = sctp6_getaddr(so, sa);
1045 #ifdef INET
1046         if (error) {
1047                 struct sockaddr_in sin;
1048
1049                 /* try v4 next if v6 failed */
1050                 error = sctp_ingetaddr(so, (struct sockaddr *)&sin);
1051                 if (error)
1052                         return (error);
1053                 in6_sin_2_v4mapsin6(&sin, (struct sockaddr_in6 *)sa);
1054         }
1055 #endif
1056         return (error);
1057 }
1058
1059 static int
1060 sctp6_getpeeraddr(struct socket *so, struct sockaddr *sa)
1061 {
1062         struct inpcb *inp = sotoinpcb(so);
1063         int error;
1064
1065         if (inp == NULL) {
1066                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1067                 return (EINVAL);
1068         }
1069
1070         /* allow v6 addresses precedence */
1071         error = sctp6_peeraddr(so, sa);
1072 #ifdef INET
1073         if (error) {
1074                 struct sockaddr_in sin;
1075
1076                 /* try v4 next if v6 failed */
1077                 error = sctp_peeraddr(so, (struct sockaddr *)&sin);
1078                 if (error)
1079                         return (error);
1080                 in6_sin_2_v4mapsin6(&sin, (struct sockaddr_in6 *)sa);
1081         }
1082 #endif
1083         return (error);
1084 }
1085
1086 #define SCTP6_PROTOSW                                                   \
1087         .pr_protocol =  IPPROTO_SCTP,                                   \
1088         .pr_ctloutput = sctp_ctloutput,                                 \
1089         .pr_abort =     sctp_abort,                                     \
1090         .pr_accept =    sctp_accept,                                    \
1091         .pr_attach =    sctp6_attach,                                   \
1092         .pr_bind =      sctp6_bind,                                     \
1093         .pr_connect =   sctp6_connect,                                  \
1094         .pr_control =   in6_control,                                    \
1095         .pr_close =     sctp6_close,                                    \
1096         .pr_detach =    sctp6_close,                                    \
1097         .pr_disconnect = sctp_disconnect,                               \
1098         .pr_listen =    sctp_listen,                                    \
1099         .pr_peeraddr =  sctp6_getpeeraddr,                              \
1100         .pr_send =      sctp6_send,                                     \
1101         .pr_shutdown =  sctp_shutdown,                                  \
1102         .pr_sockaddr =  sctp6_in6getaddr,                               \
1103         .pr_sosend =    sctp_sosend,                                    \
1104         .pr_soreceive = sctp_soreceive
1105
1106 struct protosw sctp6_seqpacket_protosw = {
1107         .pr_type = SOCK_SEQPACKET,
1108         .pr_flags = PR_WANTRCVD,
1109         SCTP6_PROTOSW
1110 };
1111
1112 struct protosw sctp6_stream_protosw = {
1113         .pr_type = SOCK_STREAM,
1114         .pr_flags = PR_CONNREQUIRED | PR_WANTRCVD,
1115         SCTP6_PROTOSW
1116 };
1117 #endif