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
  78 #if !defined(SCTP_WITH_NO_CSUM)
  79         uint8_t compute_crc;
  80
  81 #endif
  82         uint32_t mflowid;
  83         uint8_t mflowtype;
  84         uint16_t fibnum;
  85
  86         iphlen = *offp;
  87         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  88                 SCTP_RELEASE_PKT(*i_pak);
  89                 return (IPPROTO_DONE);
  90         }
  91         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  92 #ifdef SCTP_MBUF_LOGGING
  93         /* Log in any input mbufs */
  94         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  95                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
  96         }
  97 #endif
  98 #ifdef SCTP_PACKET_LOGGING
  99         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
 100                 sctp_packet_log(m);
 101         }
 102 #endif
 103         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 104             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
 105             m->m_pkthdr.len,
 106             if_name(m->m_pkthdr.rcvif),
 107             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 108         mflowid = m->m_pkthdr.flowid;
 109         mflowtype = M_HASHTYPE_GET(m);
 110         fibnum = M_GETFIB(m);
 111         SCTP_STAT_INCR(sctps_recvpackets);
 112         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 113         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 114         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 115         ip6 = mtod(m, struct ip6_hdr *);
 116         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
 117             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
 118         if (sh == NULL) {
 119                 SCTP_STAT_INCR(sctps_hdrops);
 120                 return (IPPROTO_DONE);
 121         }
 122         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 123         offset -= sizeof(struct sctp_chunkhdr);
 124         memset(&src, 0, sizeof(struct sockaddr_in6));
 125         src.sin6_family = AF_INET6;
 126         src.sin6_len = sizeof(struct sockaddr_in6);
 127         src.sin6_port = sh->src_port;
 128         src.sin6_addr = ip6->ip6_src;
 129         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 130                 goto out;
 131         }
 132         memset(&dst, 0, sizeof(struct sockaddr_in6));
 133         dst.sin6_family = AF_INET6;
 134         dst.sin6_len = sizeof(struct sockaddr_in6);
 135         dst.sin6_port = sh->dest_port;
 136         dst.sin6_addr = ip6->ip6_dst;
 137         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 138                 goto out;
 139         }
 140         length = ntohs(ip6->ip6_plen) + iphlen;
 141         /* Validate mbuf chain length with IP payload length. */
 142         if (SCTP_HEADER_LEN(m) != length) {
 143                 SCTPDBG(SCTP_DEBUG_INPUT1,
 144                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 145                 SCTP_STAT_INCR(sctps_hdrops);
 146                 goto out;
 147         }
 148         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 149                 goto out;
 150         }
 151         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 152 #if defined(SCTP_WITH_NO_CSUM)
 153         SCTP_STAT_INCR(sctps_recvnocrc);
 154 #else
 155         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 156                 SCTP_STAT_INCR(sctps_recvhwcrc);
 157                 compute_crc = 0;
 158         } else {
 159                 SCTP_STAT_INCR(sctps_recvswcrc);
 160                 compute_crc = 1;
 161         }
 162 #endif
 163         sctp_common_input_processing(&m, iphlen, offset, length,
 164             (struct sockaddr *)&src,
 165             (struct sockaddr *)&dst,
 166             sh, ch,
 167 #if !defined(SCTP_WITH_NO_CSUM)
 168             compute_crc,
 169 #endif
 170             ecn_bits,
 171             mflowtype, mflowid, fibnum,
 172             vrf_id, port);
 173 out:
 174         if (m) {
 175                 sctp_m_freem(m);
 176         }
 177         return (IPPROTO_DONE);
 178 }
 179
 180
 181 int
 182 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
 183 {
 184         return (sctp6_input_with_port(i_pak, offp, 0));
 185 }
 186
 187 void
 188 sctp6_notify(struct sctp_inpcb *inp,
 189     struct sctp_tcb *stcb,
 190     struct sctp_nets *net,
 191     uint8_t icmp6_type,
 192     uint8_t icmp6_code,
 193     uint16_t next_mtu)
 194 {
 195 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 196         struct socket *so;
 197
 198 #endif
 199         int timer_stopped;
 200
 201         switch (icmp6_type) {
 202         case ICMP6_DST_UNREACH:
 203                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
 204                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
 205                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
 206                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
 207                         /* Mark the net unreachable. */
 208                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 209                                 /* Ok that destination is not reachable */
 210                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 211                                 net->dest_state &= ~SCTP_ADDR_PF;
 212                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 213                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 214                         }
 215                 }
 216                 SCTP_TCB_UNLOCK(stcb);
 217                 break;
 218         case ICMP6_PARAM_PROB:
 219                 /* Treat it like an ABORT. */
 220                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
 221                         sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 222 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 223                         so = SCTP_INP_SO(inp);
 224                         atomic_add_int(&stcb->asoc.refcnt, 1);
 225                         SCTP_TCB_UNLOCK(stcb);
 226                         SCTP_SOCKET_LOCK(so, 1);
 227                         SCTP_TCB_LOCK(stcb);
 228                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 229 #endif
 230                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 231                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 233                         SCTP_SOCKET_UNLOCK(so, 1);
 234 #endif
 235                 } else {
 236                         SCTP_TCB_UNLOCK(stcb);
 237                 }
 238                 break;
 239         case ICMP6_PACKET_TOO_BIG:
 240                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
 241                         timer_stopped = 1;
 242                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
 243                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
 244                 } else {
 245                         timer_stopped = 0;
 246                 }
 247                 /* Update the path MTU. */
 248                 if (net->mtu > next_mtu) {
 249                         net->mtu = next_mtu;
 250                         if (net->port) {
 251                                 net->mtu -= sizeof(struct udphdr);
 252                         }
 253                 }
 254                 /* Update the association MTU */
 255                 if (stcb->asoc.smallest_mtu > next_mtu) {
 256                         sctp_pathmtu_adjustment(stcb, next_mtu);
 257                 }
 258                 /* Finally, start the PMTU timer if it was running before. */
 259                 if (timer_stopped) {
 260                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 261                 }
 262                 SCTP_TCB_UNLOCK(stcb);
 263                 break;
 264         default:
 265                 SCTP_TCB_UNLOCK(stcb);
 266                 break;
 267         }
 268 }
 269
 270 void
 271 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 272 {
 273         struct ip6ctlparam *ip6cp;
 274         struct sctp_inpcb *inp;
 275         struct sctp_tcb *stcb;
 276         struct sctp_nets *net;
 277         struct sctphdr sh;
 278         struct sockaddr_in6 src, dst;
 279
 280         if (pktdst->sa_family != AF_INET6 ||
 281             pktdst->sa_len != sizeof(struct sockaddr_in6)) {
 282                 return;
 283         }
 284         if ((unsigned)cmd >= PRC_NCMDS) {
 285                 return;
 286         }
 287         if (PRC_IS_REDIRECT(cmd)) {
 288                 d = NULL;
 289         } else if (inet6ctlerrmap[cmd] == 0) {
 290                 return;
 291         }
 292         /* If the parameter is from icmp6, decode it. */
 293         if (d != NULL) {
 294                 ip6cp = (struct ip6ctlparam *)d;
 295         } else {
 296                 ip6cp = (struct ip6ctlparam *)NULL;
 297         }
 298
 299         if (ip6cp != NULL) {
 300                 /*
 301                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 302                  * valid.
 303                  */
 304                 if (ip6cp->ip6c_m == NULL) {
 305                         return;
 306                 }
 307                 /*
 308                  * Check if we can safely examine the ports and the
 309                  * verification tag of the SCTP common header.
 310                  */
 311                 if (ip6cp->ip6c_m->m_pkthdr.len <
 312                     (int32_t) (ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
 313                         return;
 314                 }
 315                 /* Copy out the port numbers and the verification tag. */
 316                 bzero(&sh, sizeof(sh));
 317                 m_copydata(ip6cp->ip6c_m,
 318                     ip6cp->ip6c_off,
 319                     sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
 320                     (caddr_t)&sh);
 321                 memset(&src, 0, sizeof(struct sockaddr_in6));
 322                 src.sin6_family = AF_INET6;
 323                 src.sin6_len = sizeof(struct sockaddr_in6);
 324                 src.sin6_port = sh.src_port;
 325                 src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
 326                 if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 327                         return;
 328                 }
 329                 memset(&dst, 0, sizeof(struct sockaddr_in6));
 330                 dst.sin6_family = AF_INET6;
 331                 dst.sin6_len = sizeof(struct sockaddr_in6);
 332                 dst.sin6_port = sh.dest_port;
 333                 dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
 334                 if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 335                         return;
 336                 }
 337                 inp = NULL;
 338                 net = NULL;
 339                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
 340                     (struct sockaddr *)&src,
 341                     &inp, &net, 1, SCTP_DEFAULT_VRFID);
 342                 if ((stcb != NULL) &&
 343                     (net != NULL) &&
 344                     (inp != NULL)) {
 345                         /* Check the verification tag */
 346                         if (ntohl(sh.v_tag) != 0) {
 347                                 /*
 348                                  * This must be the verification tag used
 349                                  * for sending out packets. We don't
 350                                  * consider packets reflecting the
 351                                  * verification tag.
 352                                  */
 353                                 if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
 354                                         SCTP_TCB_UNLOCK(stcb);
 355                                         return;
 356                                 }
 357                         } else {
 358                                 if (ip6cp->ip6c_m->m_pkthdr.len >=
 359                                     ip6cp->ip6c_off + sizeof(struct sctphdr) +
 360                                     sizeof(struct sctp_chunkhdr) +
 361                                     offsetof(struct sctp_init, a_rwnd)) {
 362                                         /*
 363                                          * In this case we can check if we
 364                                          * got an INIT chunk and if the
 365                                          * initiate tag matches.
 366                                          */
 367                                         uint32_t initiate_tag;
 368                                         uint8_t chunk_type;
 369
 370                                         m_copydata(ip6cp->ip6c_m,
 371                                             ip6cp->ip6c_off +
 372                                             sizeof(struct sctphdr),
 373                                             sizeof(uint8_t),
 374                                             (caddr_t)&chunk_type);
 375                                         m_copydata(ip6cp->ip6c_m,
 376                                             ip6cp->ip6c_off +
 377                                             sizeof(struct sctphdr) +
 378                                             sizeof(struct sctp_chunkhdr),
 379                                             sizeof(uint32_t),
 380                                             (caddr_t)&initiate_tag);
 381                                         if ((chunk_type != SCTP_INITIATION) ||
 382                                             (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
 383                                                 SCTP_TCB_UNLOCK(stcb);
 384                                                 return;
 385                                         }
 386                                 } else {
 387                                         SCTP_TCB_UNLOCK(stcb);
 388                                         return;
 389                                 }
 390                         }
 391                         sctp6_notify(inp, stcb, net,
 392                             ip6cp->ip6c_icmp6->icmp6_type,
 393                             ip6cp->ip6c_icmp6->icmp6_code,
 394                             (uint16_t) ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
 395                 } else {
 396                         if ((stcb == NULL) && (inp != NULL)) {
 397                                 /* reduce inp's ref-count */
 398                                 SCTP_INP_WLOCK(inp);
 399                                 SCTP_INP_DECR_REF(inp);
 400                                 SCTP_INP_WUNLOCK(inp);
 401                         }
 402                         if (stcb) {
 403                                 SCTP_TCB_UNLOCK(stcb);
 404                         }
 405                 }
 406         }
 407 }
 408
 409 /*
 410  * this routine can probably be collasped into the one in sctp_userreq.c
 411  * since they do the same thing and now we lookup with a sockaddr
 412  */
 413 static int
 414 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 415 {
 416         struct xucred xuc;
 417         struct sockaddr_in6 addrs[2];
 418         struct sctp_inpcb *inp;
 419         struct sctp_nets *net;
 420         struct sctp_tcb *stcb;
 421         int error;
 422         uint32_t vrf_id;
 423
 424         vrf_id = SCTP_DEFAULT_VRFID;
 425
 426         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 427         if (error)
 428                 return (error);
 429
 430         if (req->newlen != sizeof(addrs)) {
 431                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 432                 return (EINVAL);
 433         }
 434         if (req->oldlen != sizeof(struct ucred)) {
 435                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 436                 return (EINVAL);
 437         }
 438         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 439         if (error)
 440                 return (error);
 441
 442         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 443             sin6tosa(&addrs[0]),
 444             &inp, &net, 1, vrf_id);
 445         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 446                 if ((inp != NULL) && (stcb == NULL)) {
 447                         /* reduce ref-count */
 448                         SCTP_INP_WLOCK(inp);
 449                         SCTP_INP_DECR_REF(inp);
 450                         goto cred_can_cont;
 451                 }
 452                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 453                 error = ENOENT;
 454                 goto out;
 455         }
 456         SCTP_TCB_UNLOCK(stcb);
 457         /*
 458          * We use the write lock here, only since in the error leg we need
 459          * it. If we used RLOCK, then we would have to
 460          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 461          * Better to use higher wlock.
 462          */
 463         SCTP_INP_WLOCK(inp);
 464 cred_can_cont:
 465         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 466         if (error) {
 467                 SCTP_INP_WUNLOCK(inp);
 468                 goto out;
 469         }
 470         cru2x(inp->sctp_socket->so_cred, &xuc);
 471         SCTP_INP_WUNLOCK(inp);
 472         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 473 out:
 474         return (error);
 475 }
 476
 477 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 478     0, 0,
 479     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 480
 481
 482 /* This is the same as the sctp_abort() could be made common */
 483 static void
 484 sctp6_abort(struct socket *so)
 485 {
 486         struct sctp_inpcb *inp;
 487         uint32_t flags;
 488
 489         inp = (struct sctp_inpcb *)so->so_pcb;
 490         if (inp == NULL) {
 491                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 492                 return;
 493         }
 494 sctp_must_try_again:
 495         flags = inp->sctp_flags;
 496 #ifdef SCTP_LOG_CLOSING
 497         sctp_log_closing(inp, NULL, 17);
 498 #endif
 499         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 500             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 501 #ifdef SCTP_LOG_CLOSING
 502                 sctp_log_closing(inp, NULL, 16);
 503 #endif
 504                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 505                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 506                 SOCK_LOCK(so);
 507                 SCTP_SB_CLEAR(so->so_snd);
 508                 /*
 509                  * same for the rcv ones, they are only here for the
 510                  * accounting/select.
 511                  */
 512                 SCTP_SB_CLEAR(so->so_rcv);
 513                 /* Now null out the reference, we are completely detached. */
 514                 so->so_pcb = NULL;
 515                 SOCK_UNLOCK(so);
 516         } else {
 517                 flags = inp->sctp_flags;
 518                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 519                         goto sctp_must_try_again;
 520                 }
 521         }
 522         return;
 523 }
 524
 525 static int
 526 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 527 {
 528         struct in6pcb *inp6;
 529         int error;
 530         struct sctp_inpcb *inp;
 531         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 532
 533         inp = (struct sctp_inpcb *)so->so_pcb;
 534         if (inp != NULL) {
 535                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 536                 return (EINVAL);
 537         }
 538         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 539                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 540                 if (error)
 541                         return (error);
 542         }
 543         error = sctp_inpcb_alloc(so, vrf_id);
 544         if (error)
 545                 return (error);
 546         inp = (struct sctp_inpcb *)so->so_pcb;
 547         SCTP_INP_WLOCK(inp);
 548         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 549         inp6 = (struct in6pcb *)inp;
 550
 551         inp6->inp_vflag |= INP_IPV6;
 552         inp6->in6p_hops = -1;   /* use kernel default */
 553         inp6->in6p_cksum = -1;  /* just to be sure */
 554 #ifdef INET
 555         /*
 556          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 557          * socket as well, because the socket may be bound to an IPv6
 558          * wildcard address, which may match an IPv4-mapped IPv6 address.
 559          */
 560         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 561 #endif
 562         /*
 563          * Hmm what about the IPSEC stuff that is missing here but in
 564          * sctp_attach()?
 565          */
 566         SCTP_INP_WUNLOCK(inp);
 567         return (0);
 568 }
 569
 570 static int
 571 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 572 {
 573         struct sctp_inpcb *inp;
 574         struct in6pcb *inp6;
 575         int error;
 576
 577         inp = (struct sctp_inpcb *)so->so_pcb;
 578         if (inp == NULL) {
 579                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 580                 return (EINVAL);
 581         }
 582         if (addr) {
 583                 switch (addr->sa_family) {
 584 #ifdef INET
 585                 case AF_INET:
 586                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 587                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 588                                 return (EINVAL);
 589                         }
 590                         break;
 591 #endif
 592 #ifdef INET6
 593                 case AF_INET6:
 594                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 595                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 596                                 return (EINVAL);
 597                         }
 598                         break;
 599 #endif
 600                 default:
 601                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 602                         return (EINVAL);
 603                 }
 604         }
 605         inp6 = (struct in6pcb *)inp;
 606         inp6->inp_vflag &= ~INP_IPV4;
 607         inp6->inp_vflag |= INP_IPV6;
 608         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 609                 switch (addr->sa_family) {
 610 #ifdef INET
 611                 case AF_INET:
 612                         /* binding v4 addr to v6 socket, so reset flags */
 613                         inp6->inp_vflag |= INP_IPV4;
 614                         inp6->inp_vflag &= ~INP_IPV6;
 615                         break;
 616 #endif
 617 #ifdef INET6
 618                 case AF_INET6:
 619                         {
 620                                 struct sockaddr_in6 *sin6_p;
 621
 622                                 sin6_p = (struct sockaddr_in6 *)addr;
 623
 624                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 625                                         inp6->inp_vflag |= INP_IPV4;
 626                                 }
 627 #ifdef INET
 628                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 629                                         struct sockaddr_in sin;
 630
 631                                         in6_sin6_2_sin(&sin, sin6_p);
 632                                         inp6->inp_vflag |= INP_IPV4;
 633                                         inp6->inp_vflag &= ~INP_IPV6;
 634                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 635                                         return (error);
 636                                 }
 637 #endif
 638                                 break;
 639                         }
 640 #endif
 641                 default:
 642                         break;
 643                 }
 644         } else if (addr != NULL) {
 645                 struct sockaddr_in6 *sin6_p;
 646
 647                 /* IPV6_V6ONLY socket */
 648 #ifdef INET
 649                 if (addr->sa_family == AF_INET) {
 650                         /* can't bind v4 addr to v6 only socket! */
 651                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 652                         return (EINVAL);
 653                 }
 654 #endif
 655                 sin6_p = (struct sockaddr_in6 *)addr;
 656
 657                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 658                         /* can't bind v4-mapped addrs either! */
 659                         /* NOTE: we don't support SIIT */
 660                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 661                         return (EINVAL);
 662                 }
 663         }
 664         error = sctp_inpcb_bind(so, addr, NULL, p);
 665         return (error);
 666 }
 667
 668
 669 static void
 670 sctp6_close(struct socket *so)
 671 {
 672         sctp_close(so);
 673 }
 674
 675 /* This could be made common with sctp_detach() since they are identical */
 676
 677 static
 678 int
 679 sctp6_disconnect(struct socket *so)
 680 {
 681         return (sctp_disconnect(so));
 682 }
 683
 684
 685 int
 686 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 687     struct mbuf *control, struct thread *p);
 688
 689
 690 static int
 691 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 692     struct mbuf *control, struct thread *p)
 693 {
 694         struct sctp_inpcb *inp;
 695         struct in6pcb *inp6;
 696
 697 #ifdef INET
 698         struct sockaddr_in6 *sin6;
 699
 700 #endif                          /* INET */
 701         /* No SPL needed since sctp_output does this */
 702
 703         inp = (struct sctp_inpcb *)so->so_pcb;
 704         if (inp == NULL) {
 705                 if (control) {
 706                         SCTP_RELEASE_PKT(control);
 707                         control = NULL;
 708                 }
 709                 SCTP_RELEASE_PKT(m);
 710                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 711                 return (EINVAL);
 712         }
 713         inp6 = (struct in6pcb *)inp;
 714         /*
 715          * For the TCP model we may get a NULL addr, if we are a connected
 716          * socket thats ok.
 717          */
 718         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 719             (addr == NULL)) {
 720                 goto connected_type;
 721         }
 722         if (addr == NULL) {
 723                 SCTP_RELEASE_PKT(m);
 724                 if (control) {
 725                         SCTP_RELEASE_PKT(control);
 726                         control = NULL;
 727                 }
 728                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 729                 return (EDESTADDRREQ);
 730         }
 731 #ifdef INET
 732         sin6 = (struct sockaddr_in6 *)addr;
 733         if (SCTP_IPV6_V6ONLY(inp6)) {
 734                 /*
 735                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 736                  * v4 addr or v4-mapped addr
 737                  */
 738                 if (addr->sa_family == AF_INET) {
 739                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 740                         return (EINVAL);
 741                 }
 742                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 743                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 744                         return (EINVAL);
 745                 }
 746         }
 747         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 748                 struct sockaddr_in sin;
 749
 750                 /* convert v4-mapped into v4 addr and send */
 751                 in6_sin6_2_sin(&sin, sin6);
 752                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 753         }
 754 #endif                          /* INET */
 755 connected_type:
 756         /* now what about control */
 757         if (control) {
 758                 if (inp->control) {
 759                         SCTP_PRINTF("huh? control set?\n");
 760                         SCTP_RELEASE_PKT(inp->control);
 761                         inp->control = NULL;
 762                 }
 763                 inp->control = control;
 764         }
 765         /* Place the data */
 766         if (inp->pkt) {
 767                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 768                 inp->pkt_last = m;
 769         } else {
 770                 inp->pkt_last = inp->pkt = m;
 771         }
 772         if (
 773         /* FreeBSD and MacOSX uses a flag passed */
 774             ((flags & PRUS_MORETOCOME) == 0)
 775             ) {
 776                 /*
 777                  * note with the current version this code will only be used
 778                  * by OpenBSD, NetBSD and FreeBSD have methods for
 779                  * re-defining sosend() to use sctp_sosend().  One can
 780                  * optionaly switch back to this code (by changing back the
 781                  * defininitions but this is not advisable.
 782                  */
 783                 int ret;
 784
 785                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 786                 inp->pkt = NULL;
 787                 inp->control = NULL;
 788                 return (ret);
 789         } else {
 790                 return (0);
 791         }
 792 }
 793
 794 static int
 795 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 796 {
 797         uint32_t vrf_id;
 798         int error = 0;
 799         struct sctp_inpcb *inp;
 800         struct sctp_tcb *stcb;
 801
 802 #ifdef INET
 803         struct in6pcb *inp6;
 804         struct sockaddr_in6 *sin6;
 805         union sctp_sockstore store;
 806
 807 #endif
 808
 809 #ifdef INET
 810         inp6 = (struct in6pcb *)so->so_pcb;
 811 #endif
 812         inp = (struct sctp_inpcb *)so->so_pcb;
 813         if (inp == NULL) {
 814                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 815                 return (ECONNRESET);    /* I made the same as TCP since we are
 816                                          * not setup? */
 817         }
 818         if (addr == NULL) {
 819                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 820                 return (EINVAL);
 821         }
 822         switch (addr->sa_family) {
 823 #ifdef INET
 824         case AF_INET:
 825                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 826                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 827                         return (EINVAL);
 828                 }
 829                 break;
 830 #endif
 831 #ifdef INET6
 832         case AF_INET6:
 833                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 834                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 835                         return (EINVAL);
 836                 }
 837                 break;
 838 #endif
 839         default:
 840                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 841                 return (EINVAL);
 842         }
 843
 844         vrf_id = inp->def_vrf_id;
 845         SCTP_ASOC_CREATE_LOCK(inp);
 846         SCTP_INP_RLOCK(inp);
 847         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 848             SCTP_PCB_FLAGS_UNBOUND) {
 849                 /* Bind a ephemeral port */
 850                 SCTP_INP_RUNLOCK(inp);
 851                 error = sctp6_bind(so, NULL, p);
 852                 if (error) {
 853                         SCTP_ASOC_CREATE_UNLOCK(inp);
 854
 855                         return (error);
 856                 }
 857                 SCTP_INP_RLOCK(inp);
 858         }
 859         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 860             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 861                 /* We are already connected AND the TCP model */
 862                 SCTP_INP_RUNLOCK(inp);
 863                 SCTP_ASOC_CREATE_UNLOCK(inp);
 864                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 865                 return (EADDRINUSE);
 866         }
 867 #ifdef INET
 868         sin6 = (struct sockaddr_in6 *)addr;
 869         if (SCTP_IPV6_V6ONLY(inp6)) {
 870                 /*
 871                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 872                  * addr or v4-mapped addr
 873                  */
 874                 if (addr->sa_family == AF_INET) {
 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                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 881                         SCTP_INP_RUNLOCK(inp);
 882                         SCTP_ASOC_CREATE_UNLOCK(inp);
 883                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 884                         return (EINVAL);
 885                 }
 886         }
 887         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 888                 /* convert v4-mapped into v4 addr */
 889                 in6_sin6_2_sin(&store.sin, sin6);
 890                 addr = &store.sa;
 891         }
 892 #endif                          /* INET */
 893         /* Now do we connect? */
 894         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 895                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 896                 if (stcb) {
 897                         SCTP_TCB_UNLOCK(stcb);
 898                 }
 899                 SCTP_INP_RUNLOCK(inp);
 900         } else {
 901                 SCTP_INP_RUNLOCK(inp);
 902                 SCTP_INP_WLOCK(inp);
 903                 SCTP_INP_INCR_REF(inp);
 904                 SCTP_INP_WUNLOCK(inp);
 905                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 906                 if (stcb == NULL) {
 907                         SCTP_INP_WLOCK(inp);
 908                         SCTP_INP_DECR_REF(inp);
 909                         SCTP_INP_WUNLOCK(inp);
 910                 }
 911         }
 912
 913         if (stcb != NULL) {
 914                 /* Already have or am bring up an association */
 915                 SCTP_ASOC_CREATE_UNLOCK(inp);
 916                 SCTP_TCB_UNLOCK(stcb);
 917                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 918                 return (EALREADY);
 919         }
 920         /* We are GOOD to go */
 921         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
 922             inp->sctp_ep.pre_open_stream_count,
 923             inp->sctp_ep.port, p);
 924         SCTP_ASOC_CREATE_UNLOCK(inp);
 925         if (stcb == NULL) {
 926                 /* Gak! no memory */
 927                 return (error);
 928         }
 929         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 930                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 931                 /* Set the connected flag so we can queue data */
 932                 soisconnecting(so);
 933         }
 934         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
 935         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 936
 937         /* initialize authentication parameters for the assoc */
 938         sctp_initialize_auth_params(inp, stcb);
 939
 940         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 941         SCTP_TCB_UNLOCK(stcb);
 942         return (error);
 943 }
 944
 945 static int
 946 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 947 {
 948         struct sockaddr_in6 *sin6;
 949         struct sctp_inpcb *inp;
 950         uint32_t vrf_id;
 951         struct sctp_ifa *sctp_ifa;
 952
 953         int error;
 954
 955         /*
 956          * Do the malloc first in case it blocks.
 957          */
 958         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 959         if (sin6 == NULL)
 960                 return (ENOMEM);
 961         sin6->sin6_family = AF_INET6;
 962         sin6->sin6_len = sizeof(*sin6);
 963
 964         inp = (struct sctp_inpcb *)so->so_pcb;
 965         if (inp == NULL) {
 966                 SCTP_FREE_SONAME(sin6);
 967                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 968                 return (ECONNRESET);
 969         }
 970         SCTP_INP_RLOCK(inp);
 971         sin6->sin6_port = inp->sctp_lport;
 972         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 973                 /* For the bound all case you get back 0 */
 974                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 975                         struct sctp_tcb *stcb;
 976                         struct sockaddr_in6 *sin_a6;
 977                         struct sctp_nets *net;
 978                         int fnd;
 979
 980                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 981                         if (stcb == NULL) {
 982                                 SCTP_INP_RUNLOCK(inp);
 983                                 SCTP_FREE_SONAME(sin6);
 984                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 985                                 return (ENOENT);
 986                         }
 987                         fnd = 0;
 988                         sin_a6 = NULL;
 989                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 990                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 991                                 if (sin_a6 == NULL)
 992                                         /* this will make coverity happy */
 993                                         continue;
 994
 995                                 if (sin_a6->sin6_family == AF_INET6) {
 996                                         fnd = 1;
 997                                         break;
 998                                 }
 999                         }
1000                         if ((!fnd) || (sin_a6 == NULL)) {
1001                                 /* punt */
1002                                 SCTP_INP_RUNLOCK(inp);
1003                                 SCTP_FREE_SONAME(sin6);
1004                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1005                                 return (ENOENT);
1006                         }
1007                         vrf_id = inp->def_vrf_id;
1008                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1009                         if (sctp_ifa) {
1010                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1011                         }
1012                 } else {
1013                         /* For the bound all case you get back 0 */
1014                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1015                 }
1016         } else {
1017                 /* Take the first IPv6 address in the list */
1018                 struct sctp_laddr *laddr;
1019                 int fnd = 0;
1020
1021                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1022                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1023                                 struct sockaddr_in6 *sin_a;
1024
1025                                 sin_a = &laddr->ifa->address.sin6;
1026                                 sin6->sin6_addr = sin_a->sin6_addr;
1027                                 fnd = 1;
1028                                 break;
1029                         }
1030                 }
1031                 if (!fnd) {
1032                         SCTP_FREE_SONAME(sin6);
1033                         SCTP_INP_RUNLOCK(inp);
1034                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1035                         return (ENOENT);
1036                 }
1037         }
1038         SCTP_INP_RUNLOCK(inp);
1039         /* Scoping things for v6 */
1040         if ((error = sa6_recoverscope(sin6)) != 0) {
1041                 SCTP_FREE_SONAME(sin6);
1042                 return (error);
1043         }
1044         (*addr) = (struct sockaddr *)sin6;
1045         return (0);
1046 }
1047
1048 static int
1049 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1050 {
1051         struct sockaddr_in6 *sin6;
1052         int fnd;
1053         struct sockaddr_in6 *sin_a6;
1054         struct sctp_inpcb *inp;
1055         struct sctp_tcb *stcb;
1056         struct sctp_nets *net;
1057         int error;
1058
1059         /* Do the malloc first in case it blocks. */
1060         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1061         if (sin6 == NULL)
1062                 return (ENOMEM);
1063         sin6->sin6_family = AF_INET6;
1064         sin6->sin6_len = sizeof(*sin6);
1065
1066         inp = (struct sctp_inpcb *)so->so_pcb;
1067         if ((inp == NULL) ||
1068             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1069                 /* UDP type and listeners will drop out here */
1070                 SCTP_FREE_SONAME(sin6);
1071                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1072                 return (ENOTCONN);
1073         }
1074         SCTP_INP_RLOCK(inp);
1075         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1076         if (stcb) {
1077                 SCTP_TCB_LOCK(stcb);
1078         }
1079         SCTP_INP_RUNLOCK(inp);
1080         if (stcb == NULL) {
1081                 SCTP_FREE_SONAME(sin6);
1082                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1083                 return (ECONNRESET);
1084         }
1085         fnd = 0;
1086         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1087                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1088                 if (sin_a6->sin6_family == AF_INET6) {
1089                         fnd = 1;
1090                         sin6->sin6_port = stcb->rport;
1091                         sin6->sin6_addr = sin_a6->sin6_addr;
1092                         break;
1093                 }
1094         }
1095         SCTP_TCB_UNLOCK(stcb);
1096         if (!fnd) {
1097                 /* No IPv4 address */
1098                 SCTP_FREE_SONAME(sin6);
1099                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1100                 return (ENOENT);
1101         }
1102         if ((error = sa6_recoverscope(sin6)) != 0) {
1103                 SCTP_FREE_SONAME(sin6);
1104                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1105                 return (error);
1106         }
1107         *addr = (struct sockaddr *)sin6;
1108         return (0);
1109 }
1110
1111 static int
1112 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1113 {
1114         struct in6pcb *inp6 = sotoin6pcb(so);
1115         int error;
1116
1117         if (inp6 == NULL) {
1118                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1119                 return (EINVAL);
1120         }
1121         /* allow v6 addresses precedence */
1122         error = sctp6_getaddr(so, nam);
1123 #ifdef INET
1124         if (error) {
1125                 struct sockaddr_in6 *sin6;
1126
1127                 /* try v4 next if v6 failed */
1128                 error = sctp_ingetaddr(so, nam);
1129                 if (error) {
1130                         return (error);
1131                 }
1132                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1133                 if (sin6 == NULL) {
1134                         SCTP_FREE_SONAME(*nam);
1135                         return (ENOMEM);
1136                 }
1137                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1138                 SCTP_FREE_SONAME(*nam);
1139                 *nam = (struct sockaddr *)sin6;
1140         }
1141 #endif
1142         return (error);
1143 }
1144
1145
1146 static int
1147 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1148 {
1149         struct in6pcb *inp6 = sotoin6pcb(so);
1150         int error;
1151
1152         if (inp6 == NULL) {
1153                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1154                 return (EINVAL);
1155         }
1156         /* allow v6 addresses precedence */
1157         error = sctp6_peeraddr(so, nam);
1158 #ifdef INET
1159         if (error) {
1160                 struct sockaddr_in6 *sin6;
1161
1162                 /* try v4 next if v6 failed */
1163                 error = sctp_peeraddr(so, nam);
1164                 if (error) {
1165                         return (error);
1166                 }
1167                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1168                 if (sin6 == NULL) {
1169                         SCTP_FREE_SONAME(*nam);
1170                         return (ENOMEM);
1171                 }
1172                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1173                 SCTP_FREE_SONAME(*nam);
1174                 *nam = (struct sockaddr *)sin6;
1175         }
1176 #endif
1177         return (error);
1178 }
1179
1180 struct pr_usrreqs sctp6_usrreqs = {
1181         .pru_abort = sctp6_abort,
1182         .pru_accept = sctp_accept,
1183         .pru_attach = sctp6_attach,
1184         .pru_bind = sctp6_bind,
1185         .pru_connect = sctp6_connect,
1186         .pru_control = in6_control,
1187         .pru_close = sctp6_close,
1188         .pru_detach = sctp6_close,
1189         .pru_sopoll = sopoll_generic,
1190         .pru_flush = sctp_flush,
1191         .pru_disconnect = sctp6_disconnect,
1192         .pru_listen = sctp_listen,
1193         .pru_peeraddr = sctp6_getpeeraddr,
1194         .pru_send = sctp6_send,
1195         .pru_shutdown = sctp_shutdown,
1196         .pru_sockaddr = sctp6_in6getaddr,
1197         .pru_sosend = sctp_sosend,
1198         .pru_soreceive = sctp_soreceive
1199 };
1200
1201 #endif