sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #ifdef INET6
  38 #include <sys/proc.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_var.h>
  42 #include <netinet6/sctp6_var.h>
  43 #include <netinet/sctp_sysctl.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_uio.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_indata.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_auth.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_output.h>
  53 #include <netinet/sctp_bsd_addr.h>
  54 #include <netinet/sctp_crc32.h>
  55 #include <netinet/icmp6.h>
  56 #include <netinet/udp.h>
  57
  58 #ifdef IPSEC
  59 #include <netipsec/ipsec.h>
  60 #include <netipsec/ipsec6.h>
  61 #endif                          /* IPSEC */
  62
  63 extern struct protosw inetsw[];
  64
  65 int
  66 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
  67 {
  68         struct mbuf *m;
  69         int iphlen;
  70         uint32_t vrf_id;
  71         uint8_t ecn_bits;
  72         struct sockaddr_in6 src, dst;
  73         struct ip6_hdr *ip6;
  74         struct sctphdr *sh;
  75         struct sctp_chunkhdr *ch;
  76         int length, offset;
  77 #if !defined(SCTP_WITH_NO_CSUM)
  78         uint8_t compute_crc;
  79 #endif
  80         uint32_t mflowid;
  81         uint8_t mflowtype;
  82         uint16_t fibnum;
  83
  84         iphlen = *offp;
  85         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  86                 SCTP_RELEASE_PKT(*i_pak);
  87                 return (IPPROTO_DONE);
  88         }
  89         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  90 #ifdef SCTP_MBUF_LOGGING
  91         /* Log in any input mbufs */
  92         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  93                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
  94         }
  95 #endif
  96 #ifdef SCTP_PACKET_LOGGING
  97         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
  98                 sctp_packet_log(m);
  99         }
 100 #endif
 101         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 102             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
 103             m->m_pkthdr.len,
 104             if_name(m->m_pkthdr.rcvif),
 105             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 106         mflowid = m->m_pkthdr.flowid;
 107         mflowtype = M_HASHTYPE_GET(m);
 108         fibnum = M_GETFIB(m);
 109         SCTP_STAT_INCR(sctps_recvpackets);
 110         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 111         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 112         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 113         ip6 = mtod(m, struct ip6_hdr *);
 114         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
 115             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
 116         if (sh == NULL) {
 117                 SCTP_STAT_INCR(sctps_hdrops);
 118                 return (IPPROTO_DONE);
 119         }
 120         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 121         offset -= sizeof(struct sctp_chunkhdr);
 122         memset(&src, 0, sizeof(struct sockaddr_in6));
 123         src.sin6_family = AF_INET6;
 124         src.sin6_len = sizeof(struct sockaddr_in6);
 125         src.sin6_port = sh->src_port;
 126         src.sin6_addr = ip6->ip6_src;
 127         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 128                 goto out;
 129         }
 130         memset(&dst, 0, sizeof(struct sockaddr_in6));
 131         dst.sin6_family = AF_INET6;
 132         dst.sin6_len = sizeof(struct sockaddr_in6);
 133         dst.sin6_port = sh->dest_port;
 134         dst.sin6_addr = ip6->ip6_dst;
 135         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 136                 goto out;
 137         }
 138         length = ntohs(ip6->ip6_plen) + iphlen;
 139         /* Validate mbuf chain length with IP payload length. */
 140         if (SCTP_HEADER_LEN(m) != length) {
 141                 SCTPDBG(SCTP_DEBUG_INPUT1,
 142                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 143                 SCTP_STAT_INCR(sctps_hdrops);
 144                 goto out;
 145         }
 146         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 147                 goto out;
 148         }
 149         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 150 #if defined(SCTP_WITH_NO_CSUM)
 151         SCTP_STAT_INCR(sctps_recvnocrc);
 152 #else
 153         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 154                 SCTP_STAT_INCR(sctps_recvhwcrc);
 155                 compute_crc = 0;
 156         } else {
 157                 SCTP_STAT_INCR(sctps_recvswcrc);
 158                 compute_crc = 1;
 159         }
 160 #endif
 161         sctp_common_input_processing(&m, iphlen, offset, length,
 162             (struct sockaddr *)&src,
 163             (struct sockaddr *)&dst,
 164             sh, ch,
 165 #if !defined(SCTP_WITH_NO_CSUM)
 166             compute_crc,
 167 #endif
 168             ecn_bits,
 169             mflowtype, mflowid, fibnum,
 170             vrf_id, port);
 171 out:
 172         if (m) {
 173                 sctp_m_freem(m);
 174         }
 175         return (IPPROTO_DONE);
 176 }
 177
 178
 179 int
 180 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
 181 {
 182         return (sctp6_input_with_port(i_pak, offp, 0));
 183 }
 184
 185 void
 186 sctp6_notify(struct sctp_inpcb *inp,
 187     struct sctp_tcb *stcb,
 188     struct sctp_nets *net,
 189     uint8_t icmp6_type,
 190     uint8_t icmp6_code,
 191     uint16_t next_mtu)
 192 {
 193 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 194         struct socket *so;
 195 #endif
 196         int timer_stopped;
 197
 198         switch (icmp6_type) {
 199         case ICMP6_DST_UNREACH:
 200                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
 201                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
 202                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
 203                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
 204                         /* Mark the net unreachable. */
 205                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 206                                 /* Ok that destination is not reachable */
 207                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 208                                 net->dest_state &= ~SCTP_ADDR_PF;
 209                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 210                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 211                         }
 212                 }
 213                 SCTP_TCB_UNLOCK(stcb);
 214                 break;
 215         case ICMP6_PARAM_PROB:
 216                 /* Treat it like an ABORT. */
 217                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
 218                         sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 219 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 220                         so = SCTP_INP_SO(inp);
 221                         atomic_add_int(&stcb->asoc.refcnt, 1);
 222                         SCTP_TCB_UNLOCK(stcb);
 223                         SCTP_SOCKET_LOCK(so, 1);
 224                         SCTP_TCB_LOCK(stcb);
 225                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 226 #endif
 227                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 228                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 229 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 230                         SCTP_SOCKET_UNLOCK(so, 1);
 231 #endif
 232                 } else {
 233                         SCTP_TCB_UNLOCK(stcb);
 234                 }
 235                 break;
 236         case ICMP6_PACKET_TOO_BIG:
 237                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
 238                         timer_stopped = 1;
 239                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
 240                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
 241                 } else {
 242                         timer_stopped = 0;
 243                 }
 244                 /* Update the path MTU. */
 245                 if (net->mtu > next_mtu) {
 246                         net->mtu = next_mtu;
 247                         if (net->port) {
 248                                 net->mtu -= sizeof(struct udphdr);
 249                         }
 250                 }
 251                 /* Update the association MTU */
 252                 if (stcb->asoc.smallest_mtu > next_mtu) {
 253                         sctp_pathmtu_adjustment(stcb, next_mtu);
 254                 }
 255                 /* Finally, start the PMTU timer if it was running before. */
 256                 if (timer_stopped) {
 257                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 258                 }
 259                 SCTP_TCB_UNLOCK(stcb);
 260                 break;
 261         default:
 262                 SCTP_TCB_UNLOCK(stcb);
 263                 break;
 264         }
 265 }
 266
 267 void
 268 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 269 {
 270         struct ip6ctlparam *ip6cp;
 271         struct sctp_inpcb *inp;
 272         struct sctp_tcb *stcb;
 273         struct sctp_nets *net;
 274         struct sctphdr sh;
 275         struct sockaddr_in6 src, dst;
 276
 277         if (pktdst->sa_family != AF_INET6 ||
 278             pktdst->sa_len != sizeof(struct sockaddr_in6)) {
 279                 return;
 280         }
 281         if ((unsigned)cmd >= PRC_NCMDS) {
 282                 return;
 283         }
 284         if (PRC_IS_REDIRECT(cmd)) {
 285                 d = NULL;
 286         } else if (inet6ctlerrmap[cmd] == 0) {
 287                 return;
 288         }
 289         /* If the parameter is from icmp6, decode it. */
 290         if (d != NULL) {
 291                 ip6cp = (struct ip6ctlparam *)d;
 292         } else {
 293                 ip6cp = (struct ip6ctlparam *)NULL;
 294         }
 295
 296         if (ip6cp != NULL) {
 297                 /*
 298                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 299                  * valid.
 300                  */
 301                 if (ip6cp->ip6c_m == NULL) {
 302                         return;
 303                 }
 304                 /*
 305                  * Check if we can safely examine the ports and the
 306                  * verification tag of the SCTP common header.
 307                  */
 308                 if (ip6cp->ip6c_m->m_pkthdr.len <
 309                     (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
 310                         return;
 311                 }
 312                 /* Copy out the port numbers and the verification tag. */
 313                 bzero(&sh, sizeof(sh));
 314                 m_copydata(ip6cp->ip6c_m,
 315                     ip6cp->ip6c_off,
 316                     sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
 317                     (caddr_t)&sh);
 318                 memset(&src, 0, sizeof(struct sockaddr_in6));
 319                 src.sin6_family = AF_INET6;
 320                 src.sin6_len = sizeof(struct sockaddr_in6);
 321                 src.sin6_port = sh.src_port;
 322                 src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
 323                 if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 324                         return;
 325                 }
 326                 memset(&dst, 0, sizeof(struct sockaddr_in6));
 327                 dst.sin6_family = AF_INET6;
 328                 dst.sin6_len = sizeof(struct sockaddr_in6);
 329                 dst.sin6_port = sh.dest_port;
 330                 dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
 331                 if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 332                         return;
 333                 }
 334                 inp = NULL;
 335                 net = NULL;
 336                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
 337                     (struct sockaddr *)&src,
 338                     &inp, &net, 1, SCTP_DEFAULT_VRFID);
 339                 if ((stcb != NULL) &&
 340                     (net != NULL) &&
 341                     (inp != NULL)) {
 342                         /* Check the verification tag */
 343                         if (ntohl(sh.v_tag) != 0) {
 344                                 /*
 345                                  * This must be the verification tag used
 346                                  * for sending out packets. We don't
 347                                  * consider packets reflecting the
 348                                  * verification tag.
 349                                  */
 350                                 if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
 351                                         SCTP_TCB_UNLOCK(stcb);
 352                                         return;
 353                                 }
 354                         } else {
 355                                 if (ip6cp->ip6c_m->m_pkthdr.len >=
 356                                     ip6cp->ip6c_off + sizeof(struct sctphdr) +
 357                                     sizeof(struct sctp_chunkhdr) +
 358                                     offsetof(struct sctp_init, a_rwnd)) {
 359                                         /*
 360                                          * In this case we can check if we
 361                                          * got an INIT chunk and if the
 362                                          * initiate tag matches.
 363                                          */
 364                                         uint32_t initiate_tag;
 365                                         uint8_t chunk_type;
 366
 367                                         m_copydata(ip6cp->ip6c_m,
 368                                             ip6cp->ip6c_off +
 369                                             sizeof(struct sctphdr),
 370                                             sizeof(uint8_t),
 371                                             (caddr_t)&chunk_type);
 372                                         m_copydata(ip6cp->ip6c_m,
 373                                             ip6cp->ip6c_off +
 374                                             sizeof(struct sctphdr) +
 375                                             sizeof(struct sctp_chunkhdr),
 376                                             sizeof(uint32_t),
 377                                             (caddr_t)&initiate_tag);
 378                                         if ((chunk_type != SCTP_INITIATION) ||
 379                                             (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
 380                                                 SCTP_TCB_UNLOCK(stcb);
 381                                                 return;
 382                                         }
 383                                 } else {
 384                                         SCTP_TCB_UNLOCK(stcb);
 385                                         return;
 386                                 }
 387                         }
 388                         sctp6_notify(inp, stcb, net,
 389                             ip6cp->ip6c_icmp6->icmp6_type,
 390                             ip6cp->ip6c_icmp6->icmp6_code,
 391                             (uint16_t)ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
 392                 } else {
 393                         if ((stcb == NULL) && (inp != NULL)) {
 394                                 /* reduce inp's ref-count */
 395                                 SCTP_INP_WLOCK(inp);
 396                                 SCTP_INP_DECR_REF(inp);
 397                                 SCTP_INP_WUNLOCK(inp);
 398                         }
 399                         if (stcb) {
 400                                 SCTP_TCB_UNLOCK(stcb);
 401                         }
 402                 }
 403         }
 404 }
 405
 406 /*
 407  * this routine can probably be collasped into the one in sctp_userreq.c
 408  * since they do the same thing and now we lookup with a sockaddr
 409  */
 410 static int
 411 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 412 {
 413         struct xucred xuc;
 414         struct sockaddr_in6 addrs[2];
 415         struct sctp_inpcb *inp;
 416         struct sctp_nets *net;
 417         struct sctp_tcb *stcb;
 418         int error;
 419         uint32_t vrf_id;
 420
 421         vrf_id = SCTP_DEFAULT_VRFID;
 422
 423         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 424         if (error)
 425                 return (error);
 426
 427         if (req->newlen != sizeof(addrs)) {
 428                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 429                 return (EINVAL);
 430         }
 431         if (req->oldlen != sizeof(struct ucred)) {
 432                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 433                 return (EINVAL);
 434         }
 435         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 436         if (error)
 437                 return (error);
 438
 439         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 440             sin6tosa(&addrs[0]),
 441             &inp, &net, 1, vrf_id);
 442         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 443                 if ((inp != NULL) && (stcb == NULL)) {
 444                         /* reduce ref-count */
 445                         SCTP_INP_WLOCK(inp);
 446                         SCTP_INP_DECR_REF(inp);
 447                         goto cred_can_cont;
 448                 }
 449                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 450                 error = ENOENT;
 451                 goto out;
 452         }
 453         SCTP_TCB_UNLOCK(stcb);
 454         /*
 455          * We use the write lock here, only since in the error leg we need
 456          * it. If we used RLOCK, then we would have to
 457          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 458          * Better to use higher wlock.
 459          */
 460         SCTP_INP_WLOCK(inp);
 461 cred_can_cont:
 462         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 463         if (error) {
 464                 SCTP_INP_WUNLOCK(inp);
 465                 goto out;
 466         }
 467         cru2x(inp->sctp_socket->so_cred, &xuc);
 468         SCTP_INP_WUNLOCK(inp);
 469         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 470 out:
 471         return (error);
 472 }
 473
 474 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 475     0, 0,
 476     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 477
 478
 479 /* This is the same as the sctp_abort() could be made common */
 480 static void
 481 sctp6_abort(struct socket *so)
 482 {
 483         struct sctp_inpcb *inp;
 484         uint32_t flags;
 485
 486         inp = (struct sctp_inpcb *)so->so_pcb;
 487         if (inp == NULL) {
 488                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 489                 return;
 490         }
 491 sctp_must_try_again:
 492         flags = inp->sctp_flags;
 493 #ifdef SCTP_LOG_CLOSING
 494         sctp_log_closing(inp, NULL, 17);
 495 #endif
 496         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 497             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 498 #ifdef SCTP_LOG_CLOSING
 499                 sctp_log_closing(inp, NULL, 16);
 500 #endif
 501                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 502                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 503                 SOCK_LOCK(so);
 504                 SCTP_SB_CLEAR(so->so_snd);
 505                 /*
 506                  * same for the rcv ones, they are only here for the
 507                  * accounting/select.
 508                  */
 509                 SCTP_SB_CLEAR(so->so_rcv);
 510                 /* Now null out the reference, we are completely detached. */
 511                 so->so_pcb = NULL;
 512                 SOCK_UNLOCK(so);
 513         } else {
 514                 flags = inp->sctp_flags;
 515                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 516                         goto sctp_must_try_again;
 517                 }
 518         }
 519         return;
 520 }
 521
 522 static int
 523 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 524 {
 525         struct in6pcb *inp6;
 526         int error;
 527         struct sctp_inpcb *inp;
 528         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 529
 530         inp = (struct sctp_inpcb *)so->so_pcb;
 531         if (inp != NULL) {
 532                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 533                 return (EINVAL);
 534         }
 535         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 536                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 537                 if (error)
 538                         return (error);
 539         }
 540         error = sctp_inpcb_alloc(so, vrf_id);
 541         if (error)
 542                 return (error);
 543         inp = (struct sctp_inpcb *)so->so_pcb;
 544         SCTP_INP_WLOCK(inp);
 545         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 546         inp6 = (struct in6pcb *)inp;
 547
 548         inp6->inp_vflag |= INP_IPV6;
 549         inp6->in6p_hops = -1;   /* use kernel default */
 550         inp6->in6p_cksum = -1;  /* just to be sure */
 551 #ifdef INET
 552         /*
 553          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 554          * socket as well, because the socket may be bound to an IPv6
 555          * wildcard address, which may match an IPv4-mapped IPv6 address.
 556          */
 557         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 558 #endif
 559         /*
 560          * Hmm what about the IPSEC stuff that is missing here but in
 561          * sctp_attach()?
 562          */
 563         SCTP_INP_WUNLOCK(inp);
 564         return (0);
 565 }
 566
 567 static int
 568 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 569 {
 570         struct sctp_inpcb *inp;
 571         struct in6pcb *inp6;
 572         int error;
 573
 574         inp = (struct sctp_inpcb *)so->so_pcb;
 575         if (inp == NULL) {
 576                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 577                 return (EINVAL);
 578         }
 579         if (addr) {
 580                 switch (addr->sa_family) {
 581 #ifdef INET
 582                 case AF_INET:
 583                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 584                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 585                                 return (EINVAL);
 586                         }
 587                         break;
 588 #endif
 589 #ifdef INET6
 590                 case AF_INET6:
 591                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 592                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 593                                 return (EINVAL);
 594                         }
 595                         break;
 596 #endif
 597                 default:
 598                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 599                         return (EINVAL);
 600                 }
 601         }
 602         inp6 = (struct in6pcb *)inp;
 603         inp6->inp_vflag &= ~INP_IPV4;
 604         inp6->inp_vflag |= INP_IPV6;
 605         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 606                 switch (addr->sa_family) {
 607 #ifdef INET
 608                 case AF_INET:
 609                         /* binding v4 addr to v6 socket, so reset flags */
 610                         inp6->inp_vflag |= INP_IPV4;
 611                         inp6->inp_vflag &= ~INP_IPV6;
 612                         break;
 613 #endif
 614 #ifdef INET6
 615                 case AF_INET6:
 616                         {
 617                                 struct sockaddr_in6 *sin6_p;
 618
 619                                 sin6_p = (struct sockaddr_in6 *)addr;
 620
 621                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 622                                         inp6->inp_vflag |= INP_IPV4;
 623                                 }
 624 #ifdef INET
 625                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 626                                         struct sockaddr_in sin;
 627
 628                                         in6_sin6_2_sin(&sin, sin6_p);
 629                                         inp6->inp_vflag |= INP_IPV4;
 630                                         inp6->inp_vflag &= ~INP_IPV6;
 631                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 632                                         return (error);
 633                                 }
 634 #endif
 635                                 break;
 636                         }
 637 #endif
 638                 default:
 639                         break;
 640                 }
 641         } else if (addr != NULL) {
 642                 struct sockaddr_in6 *sin6_p;
 643
 644                 /* IPV6_V6ONLY socket */
 645 #ifdef INET
 646                 if (addr->sa_family == AF_INET) {
 647                         /* can't bind v4 addr to v6 only socket! */
 648                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 649                         return (EINVAL);
 650                 }
 651 #endif
 652                 sin6_p = (struct sockaddr_in6 *)addr;
 653
 654                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 655                         /* can't bind v4-mapped addrs either! */
 656                         /* NOTE: we don't support SIIT */
 657                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 658                         return (EINVAL);
 659                 }
 660         }
 661         error = sctp_inpcb_bind(so, addr, NULL, p);
 662         return (error);
 663 }
 664
 665
 666 static void
 667 sctp6_close(struct socket *so)
 668 {
 669         sctp_close(so);
 670 }
 671
 672 /* This could be made common with sctp_detach() since they are identical */
 673
 674 static
 675 int
 676 sctp6_disconnect(struct socket *so)
 677 {
 678         return (sctp_disconnect(so));
 679 }
 680
 681
 682 int
 683 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 684     struct mbuf *control, struct thread *p);
 685
 686
 687 static int
 688 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 689     struct mbuf *control, struct thread *p)
 690 {
 691         struct sctp_inpcb *inp;
 692         struct in6pcb *inp6;
 693
 694 #ifdef INET
 695         struct sockaddr_in6 *sin6;
 696 #endif                          /* INET */
 697         /* No SPL needed since sctp_output does this */
 698
 699         inp = (struct sctp_inpcb *)so->so_pcb;
 700         if (inp == NULL) {
 701                 if (control) {
 702                         SCTP_RELEASE_PKT(control);
 703                         control = NULL;
 704                 }
 705                 SCTP_RELEASE_PKT(m);
 706                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 707                 return (EINVAL);
 708         }
 709         inp6 = (struct in6pcb *)inp;
 710         /*
 711          * For the TCP model we may get a NULL addr, if we are a connected
 712          * socket thats ok.
 713          */
 714         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 715             (addr == NULL)) {
 716                 goto connected_type;
 717         }
 718         if (addr == NULL) {
 719                 SCTP_RELEASE_PKT(m);
 720                 if (control) {
 721                         SCTP_RELEASE_PKT(control);
 722                         control = NULL;
 723                 }
 724                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 725                 return (EDESTADDRREQ);
 726         }
 727 #ifdef INET
 728         sin6 = (struct sockaddr_in6 *)addr;
 729         if (SCTP_IPV6_V6ONLY(inp6)) {
 730                 /*
 731                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 732                  * v4 addr or v4-mapped addr
 733                  */
 734                 if (addr->sa_family == AF_INET) {
 735                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 736                         return (EINVAL);
 737                 }
 738                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 739                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 740                         return (EINVAL);
 741                 }
 742         }
 743         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 744                 struct sockaddr_in sin;
 745
 746                 /* convert v4-mapped into v4 addr and send */
 747                 in6_sin6_2_sin(&sin, sin6);
 748                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 749         }
 750 #endif                          /* INET */
 751 connected_type:
 752         /* now what about control */
 753         if (control) {
 754                 if (inp->control) {
 755                         SCTP_PRINTF("huh? control set?\n");
 756                         SCTP_RELEASE_PKT(inp->control);
 757                         inp->control = NULL;
 758                 }
 759                 inp->control = control;
 760         }
 761         /* Place the data */
 762         if (inp->pkt) {
 763                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 764                 inp->pkt_last = m;
 765         } else {
 766                 inp->pkt_last = inp->pkt = m;
 767         }
 768         if (
 769         /* FreeBSD and MacOSX uses a flag passed */
 770             ((flags & PRUS_MORETOCOME) == 0)
 771             ) {
 772                 /*
 773                  * note with the current version this code will only be used
 774                  * by OpenBSD, NetBSD and FreeBSD have methods for
 775                  * re-defining sosend() to use sctp_sosend().  One can
 776                  * optionaly switch back to this code (by changing back the
 777                  * defininitions but this is not advisable.
 778                  */
 779                 int ret;
 780
 781                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 782                 inp->pkt = NULL;
 783                 inp->control = NULL;
 784                 return (ret);
 785         } else {
 786                 return (0);
 787         }
 788 }
 789
 790 static int
 791 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 792 {
 793         uint32_t vrf_id;
 794         int error = 0;
 795         struct sctp_inpcb *inp;
 796         struct sctp_tcb *stcb;
 797 #ifdef INET
 798         struct in6pcb *inp6;
 799         struct sockaddr_in6 *sin6;
 800         union sctp_sockstore store;
 801 #endif
 802
 803 #ifdef INET
 804         inp6 = (struct in6pcb *)so->so_pcb;
 805 #endif
 806         inp = (struct sctp_inpcb *)so->so_pcb;
 807         if (inp == NULL) {
 808                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 809                 return (ECONNRESET);    /* I made the same as TCP since we are
 810                                          * not setup? */
 811         }
 812         if (addr == NULL) {
 813                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 814                 return (EINVAL);
 815         }
 816         switch (addr->sa_family) {
 817 #ifdef INET
 818         case AF_INET:
 819                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 820                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 821                         return (EINVAL);
 822                 }
 823                 break;
 824 #endif
 825 #ifdef INET6
 826         case AF_INET6:
 827                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 828                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 829                         return (EINVAL);
 830                 }
 831                 break;
 832 #endif
 833         default:
 834                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 835                 return (EINVAL);
 836         }
 837
 838         vrf_id = inp->def_vrf_id;
 839         SCTP_ASOC_CREATE_LOCK(inp);
 840         SCTP_INP_RLOCK(inp);
 841         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 842             SCTP_PCB_FLAGS_UNBOUND) {
 843                 /* Bind a ephemeral port */
 844                 SCTP_INP_RUNLOCK(inp);
 845                 error = sctp6_bind(so, NULL, p);
 846                 if (error) {
 847                         SCTP_ASOC_CREATE_UNLOCK(inp);
 848
 849                         return (error);
 850                 }
 851                 SCTP_INP_RLOCK(inp);
 852         }
 853         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 854             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 855                 /* We are already connected AND the TCP model */
 856                 SCTP_INP_RUNLOCK(inp);
 857                 SCTP_ASOC_CREATE_UNLOCK(inp);
 858                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 859                 return (EADDRINUSE);
 860         }
 861 #ifdef INET
 862         sin6 = (struct sockaddr_in6 *)addr;
 863         if (SCTP_IPV6_V6ONLY(inp6)) {
 864                 /*
 865                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 866                  * addr or v4-mapped addr
 867                  */
 868                 if (addr->sa_family == AF_INET) {
 869                         SCTP_INP_RUNLOCK(inp);
 870                         SCTP_ASOC_CREATE_UNLOCK(inp);
 871                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 872                         return (EINVAL);
 873                 }
 874                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 875                         SCTP_INP_RUNLOCK(inp);
 876                         SCTP_ASOC_CREATE_UNLOCK(inp);
 877                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 878                         return (EINVAL);
 879                 }
 880         }
 881         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 882                 /* convert v4-mapped into v4 addr */
 883                 in6_sin6_2_sin(&store.sin, sin6);
 884                 addr = &store.sa;
 885         }
 886 #endif                          /* INET */
 887         /* Now do we connect? */
 888         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 889                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 890                 if (stcb) {
 891                         SCTP_TCB_UNLOCK(stcb);
 892                 }
 893                 SCTP_INP_RUNLOCK(inp);
 894         } else {
 895                 SCTP_INP_RUNLOCK(inp);
 896                 SCTP_INP_WLOCK(inp);
 897                 SCTP_INP_INCR_REF(inp);
 898                 SCTP_INP_WUNLOCK(inp);
 899                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 900                 if (stcb == NULL) {
 901                         SCTP_INP_WLOCK(inp);
 902                         SCTP_INP_DECR_REF(inp);
 903                         SCTP_INP_WUNLOCK(inp);
 904                 }
 905         }
 906
 907         if (stcb != NULL) {
 908                 /* Already have or am bring up an association */
 909                 SCTP_ASOC_CREATE_UNLOCK(inp);
 910                 SCTP_TCB_UNLOCK(stcb);
 911                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 912                 return (EALREADY);
 913         }
 914         /* We are GOOD to go */
 915         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
 916             inp->sctp_ep.pre_open_stream_count,
 917             inp->sctp_ep.port, p);
 918         SCTP_ASOC_CREATE_UNLOCK(inp);
 919         if (stcb == NULL) {
 920                 /* Gak! no memory */
 921                 return (error);
 922         }
 923         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 924                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 925                 /* Set the connected flag so we can queue data */
 926                 soisconnecting(so);
 927         }
 928         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
 929         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 930
 931         /* initialize authentication parameters for the assoc */
 932         sctp_initialize_auth_params(inp, stcb);
 933
 934         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 935         SCTP_TCB_UNLOCK(stcb);
 936         return (error);
 937 }
 938
 939 static int
 940 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 941 {
 942         struct sockaddr_in6 *sin6;
 943         struct sctp_inpcb *inp;
 944         uint32_t vrf_id;
 945         struct sctp_ifa *sctp_ifa;
 946
 947         int error;
 948
 949         /*
 950          * Do the malloc first in case it blocks.
 951          */
 952         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 953         if (sin6 == NULL)
 954                 return (ENOMEM);
 955         sin6->sin6_family = AF_INET6;
 956         sin6->sin6_len = sizeof(*sin6);
 957
 958         inp = (struct sctp_inpcb *)so->so_pcb;
 959         if (inp == NULL) {
 960                 SCTP_FREE_SONAME(sin6);
 961                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 962                 return (ECONNRESET);
 963         }
 964         SCTP_INP_RLOCK(inp);
 965         sin6->sin6_port = inp->sctp_lport;
 966         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 967                 /* For the bound all case you get back 0 */
 968                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 969                         struct sctp_tcb *stcb;
 970                         struct sockaddr_in6 *sin_a6;
 971                         struct sctp_nets *net;
 972                         int fnd;
 973
 974                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 975                         if (stcb == NULL) {
 976                                 SCTP_INP_RUNLOCK(inp);
 977                                 SCTP_FREE_SONAME(sin6);
 978                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 979                                 return (ENOENT);
 980                         }
 981                         fnd = 0;
 982                         sin_a6 = NULL;
 983                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 984                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 985                                 if (sin_a6 == NULL)
 986                                         /* this will make coverity happy */
 987                                         continue;
 988
 989                                 if (sin_a6->sin6_family == AF_INET6) {
 990                                         fnd = 1;
 991                                         break;
 992                                 }
 993                         }
 994                         if ((!fnd) || (sin_a6 == NULL)) {
 995                                 /* punt */
 996                                 SCTP_INP_RUNLOCK(inp);
 997                                 SCTP_FREE_SONAME(sin6);
 998                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 999                                 return (ENOENT);
1000                         }
1001                         vrf_id = inp->def_vrf_id;
1002                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
1003                         if (sctp_ifa) {
1004                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1005                         }
1006                 } else {
1007                         /* For the bound all case you get back 0 */
1008                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1009                 }
1010         } else {
1011                 /* Take the first IPv6 address in the list */
1012                 struct sctp_laddr *laddr;
1013                 int fnd = 0;
1014
1015                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1016                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1017                                 struct sockaddr_in6 *sin_a;
1018
1019                                 sin_a = &laddr->ifa->address.sin6;
1020                                 sin6->sin6_addr = sin_a->sin6_addr;
1021                                 fnd = 1;
1022                                 break;
1023                         }
1024                 }
1025                 if (!fnd) {
1026                         SCTP_FREE_SONAME(sin6);
1027                         SCTP_INP_RUNLOCK(inp);
1028                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1029                         return (ENOENT);
1030                 }
1031         }
1032         SCTP_INP_RUNLOCK(inp);
1033         /* Scoping things for v6 */
1034         if ((error = sa6_recoverscope(sin6)) != 0) {
1035                 SCTP_FREE_SONAME(sin6);
1036                 return (error);
1037         }
1038         (*addr) = (struct sockaddr *)sin6;
1039         return (0);
1040 }
1041
1042 static int
1043 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1044 {
1045         struct sockaddr_in6 *sin6;
1046         int fnd;
1047         struct sockaddr_in6 *sin_a6;
1048         struct sctp_inpcb *inp;
1049         struct sctp_tcb *stcb;
1050         struct sctp_nets *net;
1051         int error;
1052
1053         /* Do the malloc first in case it blocks. */
1054         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1055         if (sin6 == NULL)
1056                 return (ENOMEM);
1057         sin6->sin6_family = AF_INET6;
1058         sin6->sin6_len = sizeof(*sin6);
1059
1060         inp = (struct sctp_inpcb *)so->so_pcb;
1061         if ((inp == NULL) ||
1062             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1063                 /* UDP type and listeners will drop out here */
1064                 SCTP_FREE_SONAME(sin6);
1065                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1066                 return (ENOTCONN);
1067         }
1068         SCTP_INP_RLOCK(inp);
1069         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1070         if (stcb) {
1071                 SCTP_TCB_LOCK(stcb);
1072         }
1073         SCTP_INP_RUNLOCK(inp);
1074         if (stcb == NULL) {
1075                 SCTP_FREE_SONAME(sin6);
1076                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1077                 return (ECONNRESET);
1078         }
1079         fnd = 0;
1080         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1081                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1082                 if (sin_a6->sin6_family == AF_INET6) {
1083                         fnd = 1;
1084                         sin6->sin6_port = stcb->rport;
1085                         sin6->sin6_addr = sin_a6->sin6_addr;
1086                         break;
1087                 }
1088         }
1089         SCTP_TCB_UNLOCK(stcb);
1090         if (!fnd) {
1091                 /* No IPv4 address */
1092                 SCTP_FREE_SONAME(sin6);
1093                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1094                 return (ENOENT);
1095         }
1096         if ((error = sa6_recoverscope(sin6)) != 0) {
1097                 SCTP_FREE_SONAME(sin6);
1098                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1099                 return (error);
1100         }
1101         *addr = (struct sockaddr *)sin6;
1102         return (0);
1103 }
1104
1105 static int
1106 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1107 {
1108         struct in6pcb *inp6 = sotoin6pcb(so);
1109         int error;
1110
1111         if (inp6 == NULL) {
1112                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1113                 return (EINVAL);
1114         }
1115         /* allow v6 addresses precedence */
1116         error = sctp6_getaddr(so, nam);
1117 #ifdef INET
1118         if (error) {
1119                 struct sockaddr_in6 *sin6;
1120
1121                 /* try v4 next if v6 failed */
1122                 error = sctp_ingetaddr(so, nam);
1123                 if (error) {
1124                         return (error);
1125                 }
1126                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1127                 if (sin6 == NULL) {
1128                         SCTP_FREE_SONAME(*nam);
1129                         return (ENOMEM);
1130                 }
1131                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1132                 SCTP_FREE_SONAME(*nam);
1133                 *nam = (struct sockaddr *)sin6;
1134         }
1135 #endif
1136         return (error);
1137 }
1138
1139
1140 static int
1141 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1142 {
1143         struct in6pcb *inp6 = sotoin6pcb(so);
1144         int error;
1145
1146         if (inp6 == NULL) {
1147                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1148                 return (EINVAL);
1149         }
1150         /* allow v6 addresses precedence */
1151         error = sctp6_peeraddr(so, nam);
1152 #ifdef INET
1153         if (error) {
1154                 struct sockaddr_in6 *sin6;
1155
1156                 /* try v4 next if v6 failed */
1157                 error = sctp_peeraddr(so, nam);
1158                 if (error) {
1159                         return (error);
1160                 }
1161                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1162                 if (sin6 == NULL) {
1163                         SCTP_FREE_SONAME(*nam);
1164                         return (ENOMEM);
1165                 }
1166                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1167                 SCTP_FREE_SONAME(*nam);
1168                 *nam = (struct sockaddr *)sin6;
1169         }
1170 #endif
1171         return (error);
1172 }
1173
1174 struct pr_usrreqs sctp6_usrreqs = {
1175         .pru_abort = sctp6_abort,
1176         .pru_accept = sctp_accept,
1177         .pru_attach = sctp6_attach,
1178         .pru_bind = sctp6_bind,
1179         .pru_connect = sctp6_connect,
1180         .pru_control = in6_control,
1181         .pru_close = sctp6_close,
1182         .pru_detach = sctp6_close,
1183         .pru_sopoll = sopoll_generic,
1184         .pru_flush = sctp_flush,
1185         .pru_disconnect = sctp6_disconnect,
1186         .pru_listen = sctp_listen,
1187         .pru_peeraddr = sctp6_getpeeraddr,
1188         .pru_send = sctp6_send,
1189         .pru_shutdown = sctp_shutdown,
1190         .pru_sockaddr = sctp6_in6getaddr,
1191         .pru_sosend = sctp_sosend,
1192         .pru_soreceive = sctp_soreceive
1193 };
1194
1195 #endif