sys/netinet6/sctp6_usrreq.c

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