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 extern struct protosw inetsw[];
  61
  62 int
  63 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
  64 {
  65         struct mbuf *m;
  66         int iphlen;
  67         uint32_t vrf_id;
  68         uint8_t ecn_bits;
  69         struct sockaddr_in6 src, dst;
  70         struct ip6_hdr *ip6;
  71         struct sctphdr *sh;
  72         struct sctp_chunkhdr *ch;
  73         int length, offset;
  74 #if !defined(SCTP_WITH_NO_CSUM)
  75         uint8_t compute_crc;
  76 #endif
  77         uint32_t mflowid;
  78         uint8_t mflowtype;
  79         uint16_t fibnum;
  80
  81         iphlen = *offp;
  82         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  83                 SCTP_RELEASE_PKT(*i_pak);
  84                 return (IPPROTO_DONE);
  85         }
  86         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  87 #ifdef SCTP_MBUF_LOGGING
  88         /* Log in any input mbufs */
  89         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  90                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
  91         }
  92 #endif
  93 #ifdef SCTP_PACKET_LOGGING
  94         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
  95                 sctp_packet_log(m);
  96         }
  97 #endif
  98         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
  99             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
 100             m->m_pkthdr.len,
 101             if_name(m->m_pkthdr.rcvif),
 102             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 103         mflowid = m->m_pkthdr.flowid;
 104         mflowtype = M_HASHTYPE_GET(m);
 105         fibnum = M_GETFIB(m);
 106         SCTP_STAT_INCR(sctps_recvpackets);
 107         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 108         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 109         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 110         ip6 = mtod(m, struct ip6_hdr *);
 111         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
 112             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
 113         if (sh == NULL) {
 114                 SCTP_STAT_INCR(sctps_hdrops);
 115                 return (IPPROTO_DONE);
 116         }
 117         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 118         offset -= sizeof(struct sctp_chunkhdr);
 119         memset(&src, 0, sizeof(struct sockaddr_in6));
 120         src.sin6_family = AF_INET6;
 121         src.sin6_len = sizeof(struct sockaddr_in6);
 122         src.sin6_port = sh->src_port;
 123         src.sin6_addr = ip6->ip6_src;
 124         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 125                 goto out;
 126         }
 127         memset(&dst, 0, sizeof(struct sockaddr_in6));
 128         dst.sin6_family = AF_INET6;
 129         dst.sin6_len = sizeof(struct sockaddr_in6);
 130         dst.sin6_port = sh->dest_port;
 131         dst.sin6_addr = ip6->ip6_dst;
 132         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 133                 goto out;
 134         }
 135         length = ntohs(ip6->ip6_plen) + iphlen;
 136         /* Validate mbuf chain length with IP payload length. */
 137         if (SCTP_HEADER_LEN(m) != length) {
 138                 SCTPDBG(SCTP_DEBUG_INPUT1,
 139                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 140                 SCTP_STAT_INCR(sctps_hdrops);
 141                 goto out;
 142         }
 143         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 144                 goto out;
 145         }
 146         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 147 #if defined(SCTP_WITH_NO_CSUM)
 148         SCTP_STAT_INCR(sctps_recvnocrc);
 149 #else
 150         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 151                 SCTP_STAT_INCR(sctps_recvhwcrc);
 152                 compute_crc = 0;
 153         } else {
 154                 SCTP_STAT_INCR(sctps_recvswcrc);
 155                 compute_crc = 1;
 156         }
 157 #endif
 158         sctp_common_input_processing(&m, iphlen, offset, length,
 159             (struct sockaddr *)&src,
 160             (struct sockaddr *)&dst,
 161             sh, ch,
 162 #if !defined(SCTP_WITH_NO_CSUM)
 163             compute_crc,
 164 #endif
 165             ecn_bits,
 166             mflowtype, mflowid, fibnum,
 167             vrf_id, port);
 168 out:
 169         if (m) {
 170                 sctp_m_freem(m);
 171         }
 172         return (IPPROTO_DONE);
 173 }
 174
 175
 176 int
 177 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
 178 {
 179         return (sctp6_input_with_port(i_pak, offp, 0));
 180 }
 181
 182 void
 183 sctp6_notify(struct sctp_inpcb *inp,
 184     struct sctp_tcb *stcb,
 185     struct sctp_nets *net,
 186     uint8_t icmp6_type,
 187     uint8_t icmp6_code,
 188     uint32_t next_mtu)
 189 {
 190 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 191         struct socket *so;
 192 #endif
 193         int timer_stopped;
 194
 195         switch (icmp6_type) {
 196         case ICMP6_DST_UNREACH:
 197                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
 198                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
 199                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
 200                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
 201                         /* Mark the net unreachable. */
 202                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 203                                 /* Ok that destination is not reachable */
 204                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 205                                 net->dest_state &= ~SCTP_ADDR_PF;
 206                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 207                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 208                         }
 209                 }
 210                 SCTP_TCB_UNLOCK(stcb);
 211                 break;
 212         case ICMP6_PARAM_PROB:
 213                 /* Treat it like an ABORT. */
 214                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
 215                         sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 216 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 217                         so = SCTP_INP_SO(inp);
 218                         atomic_add_int(&stcb->asoc.refcnt, 1);
 219                         SCTP_TCB_UNLOCK(stcb);
 220                         SCTP_SOCKET_LOCK(so, 1);
 221                         SCTP_TCB_LOCK(stcb);
 222                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 223 #endif
 224                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 225                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 226 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 227                         SCTP_SOCKET_UNLOCK(so, 1);
 228 #endif
 229                 } else {
 230                         SCTP_TCB_UNLOCK(stcb);
 231                 }
 232                 break;
 233         case ICMP6_PACKET_TOO_BIG:
 234                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
 235                         timer_stopped = 1;
 236                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
 237                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
 238                 } else {
 239                         timer_stopped = 0;
 240                 }
 241                 /* Update the path MTU. */
 242                 if (net->port) {
 243                         next_mtu -= sizeof(struct udphdr);
 244                 }
 245                 if (net->mtu > next_mtu) {
 246                         net->mtu = next_mtu;
 247                 }
 248                 /* Update the association MTU */
 249                 if (stcb->asoc.smallest_mtu > next_mtu) {
 250                         sctp_pathmtu_adjustment(stcb, next_mtu);
 251                 }
 252                 /* Finally, start the PMTU timer if it was running before. */
 253                 if (timer_stopped) {
 254                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 255                 }
 256                 SCTP_TCB_UNLOCK(stcb);
 257                 break;
 258         default:
 259                 SCTP_TCB_UNLOCK(stcb);
 260                 break;
 261         }
 262 }
 263
 264 void
 265 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 266 {
 267         struct ip6ctlparam *ip6cp;
 268         struct sctp_inpcb *inp;
 269         struct sctp_tcb *stcb;
 270         struct sctp_nets *net;
 271         struct sctphdr sh;
 272         struct sockaddr_in6 src, dst;
 273
 274         if (pktdst->sa_family != AF_INET6 ||
 275             pktdst->sa_len != sizeof(struct sockaddr_in6)) {
 276                 return;
 277         }
 278         if ((unsigned)cmd >= PRC_NCMDS) {
 279                 return;
 280         }
 281         if (PRC_IS_REDIRECT(cmd)) {
 282                 d = NULL;
 283         } else if (inet6ctlerrmap[cmd] == 0) {
 284                 return;
 285         }
 286         /* If the parameter is from icmp6, decode it. */
 287         if (d != NULL) {
 288                 ip6cp = (struct ip6ctlparam *)d;
 289         } else {
 290                 ip6cp = (struct ip6ctlparam *)NULL;
 291         }
 292
 293         if (ip6cp != NULL) {
 294                 /*
 295                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 296                  * valid.
 297                  */
 298                 if (ip6cp->ip6c_m == NULL) {
 299                         return;
 300                 }
 301                 /*
 302                  * Check if we can safely examine the ports and the
 303                  * verification tag of the SCTP common header.
 304                  */
 305                 if (ip6cp->ip6c_m->m_pkthdr.len <
 306                     (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
 307                         return;
 308                 }
 309                 /* Copy out the port numbers and the verification tag. */
 310                 bzero(&sh, sizeof(sh));
 311                 m_copydata(ip6cp->ip6c_m,
 312                     ip6cp->ip6c_off,
 313                     sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
 314                     (caddr_t)&sh);
 315                 memset(&src, 0, sizeof(struct sockaddr_in6));
 316                 src.sin6_family = AF_INET6;
 317                 src.sin6_len = sizeof(struct sockaddr_in6);
 318                 src.sin6_port = sh.src_port;
 319                 src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
 320                 if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 321                         return;
 322                 }
 323                 memset(&dst, 0, sizeof(struct sockaddr_in6));
 324                 dst.sin6_family = AF_INET6;
 325                 dst.sin6_len = sizeof(struct sockaddr_in6);
 326                 dst.sin6_port = sh.dest_port;
 327                 dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
 328                 if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 329                         return;
 330                 }
 331                 inp = NULL;
 332                 net = NULL;
 333                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
 334                     (struct sockaddr *)&src,
 335                     &inp, &net, 1, SCTP_DEFAULT_VRFID);
 336                 if ((stcb != NULL) &&
 337                     (net != NULL) &&
 338                     (inp != NULL)) {
 339                         /* Check the verification tag */
 340                         if (ntohl(sh.v_tag) != 0) {
 341                                 /*
 342                                  * This must be the verification tag used
 343                                  * for sending out packets. We don't
 344                                  * consider packets reflecting the
 345                                  * verification tag.
 346                                  */
 347                                 if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
 348                                         SCTP_TCB_UNLOCK(stcb);
 349                                         return;
 350                                 }
 351                         } else {
 352                                 if (ip6cp->ip6c_m->m_pkthdr.len >=
 353                                     ip6cp->ip6c_off + sizeof(struct sctphdr) +
 354                                     sizeof(struct sctp_chunkhdr) +
 355                                     offsetof(struct sctp_init, a_rwnd)) {
 356                                         /*
 357                                          * In this case we can check if we
 358                                          * got an INIT chunk and if the
 359                                          * initiate tag matches.
 360                                          */
 361                                         uint32_t initiate_tag;
 362                                         uint8_t chunk_type;
 363
 364                                         m_copydata(ip6cp->ip6c_m,
 365                                             ip6cp->ip6c_off +
 366                                             sizeof(struct sctphdr),
 367                                             sizeof(uint8_t),
 368                                             (caddr_t)&chunk_type);
 369                                         m_copydata(ip6cp->ip6c_m,
 370                                             ip6cp->ip6c_off +
 371                                             sizeof(struct sctphdr) +
 372                                             sizeof(struct sctp_chunkhdr),
 373                                             sizeof(uint32_t),
 374                                             (caddr_t)&initiate_tag);
 375                                         if ((chunk_type != SCTP_INITIATION) ||
 376                                             (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
 377                                                 SCTP_TCB_UNLOCK(stcb);
 378                                                 return;
 379                                         }
 380                                 } else {
 381                                         SCTP_TCB_UNLOCK(stcb);
 382                                         return;
 383                                 }
 384                         }
 385                         sctp6_notify(inp, stcb, net,
 386                             ip6cp->ip6c_icmp6->icmp6_type,
 387                             ip6cp->ip6c_icmp6->icmp6_code,
 388                             ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
 389                 } else {
 390                         if ((stcb == NULL) && (inp != NULL)) {
 391                                 /* reduce inp's ref-count */
 392                                 SCTP_INP_WLOCK(inp);
 393                                 SCTP_INP_DECR_REF(inp);
 394                                 SCTP_INP_WUNLOCK(inp);
 395                         }
 396                         if (stcb) {
 397                                 SCTP_TCB_UNLOCK(stcb);
 398                         }
 399                 }
 400         }
 401 }
 402
 403 /*
 404  * this routine can probably be collasped into the one in sctp_userreq.c
 405  * since they do the same thing and now we lookup with a sockaddr
 406  */
 407 static int
 408 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 409 {
 410         struct xucred xuc;
 411         struct sockaddr_in6 addrs[2];
 412         struct sctp_inpcb *inp;
 413         struct sctp_nets *net;
 414         struct sctp_tcb *stcb;
 415         int error;
 416         uint32_t vrf_id;
 417
 418         vrf_id = SCTP_DEFAULT_VRFID;
 419
 420         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 421         if (error)
 422                 return (error);
 423
 424         if (req->newlen != sizeof(addrs)) {
 425                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 426                 return (EINVAL);
 427         }
 428         if (req->oldlen != sizeof(struct ucred)) {
 429                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 430                 return (EINVAL);
 431         }
 432         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 433         if (error)
 434                 return (error);
 435
 436         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 437             sin6tosa(&addrs[0]),
 438             &inp, &net, 1, vrf_id);
 439         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 440                 if ((inp != NULL) && (stcb == NULL)) {
 441                         /* reduce ref-count */
 442                         SCTP_INP_WLOCK(inp);
 443                         SCTP_INP_DECR_REF(inp);
 444                         goto cred_can_cont;
 445                 }
 446                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 447                 error = ENOENT;
 448                 goto out;
 449         }
 450         SCTP_TCB_UNLOCK(stcb);
 451         /*
 452          * We use the write lock here, only since in the error leg we need
 453          * it. If we used RLOCK, then we would have to
 454          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 455          * Better to use higher wlock.
 456          */
 457         SCTP_INP_WLOCK(inp);
 458 cred_can_cont:
 459         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 460         if (error) {
 461                 SCTP_INP_WUNLOCK(inp);
 462                 goto out;
 463         }
 464         cru2x(inp->sctp_socket->so_cred, &xuc);
 465         SCTP_INP_WUNLOCK(inp);
 466         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 467 out:
 468         return (error);
 469 }
 470
 471 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 472     0, 0,
 473     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 474
 475
 476 /* This is the same as the sctp_abort() could be made common */
 477 static void
 478 sctp6_abort(struct socket *so)
 479 {
 480         struct sctp_inpcb *inp;
 481         uint32_t flags;
 482
 483         inp = (struct sctp_inpcb *)so->so_pcb;
 484         if (inp == NULL) {
 485                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 486                 return;
 487         }
 488 sctp_must_try_again:
 489         flags = inp->sctp_flags;
 490 #ifdef SCTP_LOG_CLOSING
 491         sctp_log_closing(inp, NULL, 17);
 492 #endif
 493         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 494             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 495 #ifdef SCTP_LOG_CLOSING
 496                 sctp_log_closing(inp, NULL, 16);
 497 #endif
 498                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 499                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 500                 SOCK_LOCK(so);
 501                 SCTP_SB_CLEAR(so->so_snd);
 502                 /*
 503                  * same for the rcv ones, they are only here for the
 504                  * accounting/select.
 505                  */
 506                 SCTP_SB_CLEAR(so->so_rcv);
 507                 /* Now null out the reference, we are completely detached. */
 508                 so->so_pcb = NULL;
 509                 SOCK_UNLOCK(so);
 510         } else {
 511                 flags = inp->sctp_flags;
 512                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 513                         goto sctp_must_try_again;
 514                 }
 515         }
 516         return;
 517 }
 518
 519 static int
 520 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 521 {
 522         struct in6pcb *inp6;
 523         int error;
 524         struct sctp_inpcb *inp;
 525         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 526
 527         inp = (struct sctp_inpcb *)so->so_pcb;
 528         if (inp != NULL) {
 529                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 530                 return (EINVAL);
 531         }
 532         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 533                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 534                 if (error)
 535                         return (error);
 536         }
 537         error = sctp_inpcb_alloc(so, vrf_id);
 538         if (error)
 539                 return (error);
 540         inp = (struct sctp_inpcb *)so->so_pcb;
 541         SCTP_INP_WLOCK(inp);
 542         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 543         inp6 = (struct in6pcb *)inp;
 544
 545         inp6->inp_vflag |= INP_IPV6;
 546         inp6->in6p_hops = -1;   /* use kernel default */
 547         inp6->in6p_cksum = -1;  /* just to be sure */
 548 #ifdef INET
 549         /*
 550          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 551          * socket as well, because the socket may be bound to an IPv6
 552          * wildcard address, which may match an IPv4-mapped IPv6 address.
 553          */
 554         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 555 #endif
 556         SCTP_INP_WUNLOCK(inp);
 557         return (0);
 558 }
 559
 560 static int
 561 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 562 {
 563         struct sctp_inpcb *inp;
 564         struct in6pcb *inp6;
 565         int error;
 566
 567         inp = (struct sctp_inpcb *)so->so_pcb;
 568         if (inp == NULL) {
 569                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 570                 return (EINVAL);
 571         }
 572         if (addr) {
 573                 switch (addr->sa_family) {
 574 #ifdef INET
 575                 case AF_INET:
 576                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 577                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 578                                 return (EINVAL);
 579                         }
 580                         break;
 581 #endif
 582 #ifdef INET6
 583                 case AF_INET6:
 584                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 585                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 586                                 return (EINVAL);
 587                         }
 588                         break;
 589 #endif
 590                 default:
 591                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 592                         return (EINVAL);
 593                 }
 594         }
 595         inp6 = (struct in6pcb *)inp;
 596         inp6->inp_vflag &= ~INP_IPV4;
 597         inp6->inp_vflag |= INP_IPV6;
 598         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 599                 switch (addr->sa_family) {
 600 #ifdef INET
 601                 case AF_INET:
 602                         /* binding v4 addr to v6 socket, so reset flags */
 603                         inp6->inp_vflag |= INP_IPV4;
 604                         inp6->inp_vflag &= ~INP_IPV6;
 605                         break;
 606 #endif
 607 #ifdef INET6
 608                 case AF_INET6:
 609                         {
 610                                 struct sockaddr_in6 *sin6_p;
 611
 612                                 sin6_p = (struct sockaddr_in6 *)addr;
 613
 614                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 615                                         inp6->inp_vflag |= INP_IPV4;
 616                                 }
 617 #ifdef INET
 618                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 619                                         struct sockaddr_in sin;
 620
 621                                         in6_sin6_2_sin(&sin, sin6_p);
 622                                         inp6->inp_vflag |= INP_IPV4;
 623                                         inp6->inp_vflag &= ~INP_IPV6;
 624                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 625                                         return (error);
 626                                 }
 627 #endif
 628                                 break;
 629                         }
 630 #endif
 631                 default:
 632                         break;
 633                 }
 634         } else if (addr != NULL) {
 635                 struct sockaddr_in6 *sin6_p;
 636
 637                 /* IPV6_V6ONLY socket */
 638 #ifdef INET
 639                 if (addr->sa_family == AF_INET) {
 640                         /* can't bind v4 addr to v6 only socket! */
 641                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 642                         return (EINVAL);
 643                 }
 644 #endif
 645                 sin6_p = (struct sockaddr_in6 *)addr;
 646
 647                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 648                         /* can't bind v4-mapped addrs either! */
 649                         /* NOTE: we don't support SIIT */
 650                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 651                         return (EINVAL);
 652                 }
 653         }
 654         error = sctp_inpcb_bind(so, addr, NULL, p);
 655         return (error);
 656 }
 657
 658
 659 static void
 660 sctp6_close(struct socket *so)
 661 {
 662         sctp_close(so);
 663 }
 664
 665 /* This could be made common with sctp_detach() since they are identical */
 666
 667 static
 668 int
 669 sctp6_disconnect(struct socket *so)
 670 {
 671         return (sctp_disconnect(so));
 672 }
 673
 674
 675 int
 676 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 677     struct mbuf *control, struct thread *p);
 678
 679
 680 static int
 681 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 682     struct mbuf *control, struct thread *p)
 683 {
 684         struct sctp_inpcb *inp;
 685         struct in6pcb *inp6;
 686
 687 #ifdef INET
 688         struct sockaddr_in6 *sin6;
 689 #endif                          /* INET */
 690         /* No SPL needed since sctp_output does this */
 691
 692         inp = (struct sctp_inpcb *)so->so_pcb;
 693         if (inp == NULL) {
 694                 if (control) {
 695                         SCTP_RELEASE_PKT(control);
 696                         control = NULL;
 697                 }
 698                 SCTP_RELEASE_PKT(m);
 699                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 700                 return (EINVAL);
 701         }
 702         inp6 = (struct in6pcb *)inp;
 703         /*
 704          * For the TCP model we may get a NULL addr, if we are a connected
 705          * socket thats ok.
 706          */
 707         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 708             (addr == NULL)) {
 709                 goto connected_type;
 710         }
 711         if (addr == NULL) {
 712                 SCTP_RELEASE_PKT(m);
 713                 if (control) {
 714                         SCTP_RELEASE_PKT(control);
 715                         control = NULL;
 716                 }
 717                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 718                 return (EDESTADDRREQ);
 719         }
 720 #ifdef INET
 721         sin6 = (struct sockaddr_in6 *)addr;
 722         if (SCTP_IPV6_V6ONLY(inp6)) {
 723                 /*
 724                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 725                  * v4 addr or v4-mapped addr
 726                  */
 727                 if (addr->sa_family == AF_INET) {
 728                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 729                         return (EINVAL);
 730                 }
 731                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 732                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 733                         return (EINVAL);
 734                 }
 735         }
 736         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 737                 struct sockaddr_in sin;
 738
 739                 /* convert v4-mapped into v4 addr and send */
 740                 in6_sin6_2_sin(&sin, sin6);
 741                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 742         }
 743 #endif                          /* INET */
 744 connected_type:
 745         /* now what about control */
 746         if (control) {
 747                 if (inp->control) {
 748                         SCTP_PRINTF("huh? control set?\n");
 749                         SCTP_RELEASE_PKT(inp->control);
 750                         inp->control = NULL;
 751                 }
 752                 inp->control = control;
 753         }
 754         /* Place the data */
 755         if (inp->pkt) {
 756                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 757                 inp->pkt_last = m;
 758         } else {
 759                 inp->pkt_last = inp->pkt = m;
 760         }
 761         if (
 762         /* FreeBSD and MacOSX uses a flag passed */
 763             ((flags & PRUS_MORETOCOME) == 0)
 764             ) {
 765                 /*
 766                  * note with the current version this code will only be used
 767                  * by OpenBSD, NetBSD and FreeBSD have methods for
 768                  * re-defining sosend() to use sctp_sosend().  One can
 769                  * optionaly switch back to this code (by changing back the
 770                  * defininitions but this is not advisable.
 771                  */
 772                 int ret;
 773
 774                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 775                 inp->pkt = NULL;
 776                 inp->control = NULL;
 777                 return (ret);
 778         } else {
 779                 return (0);
 780         }
 781 }
 782
 783 static int
 784 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 785 {
 786         uint32_t vrf_id;
 787         int error = 0;
 788         struct sctp_inpcb *inp;
 789         struct sctp_tcb *stcb;
 790 #ifdef INET
 791         struct in6pcb *inp6;
 792         struct sockaddr_in6 *sin6;
 793         union sctp_sockstore store;
 794 #endif
 795
 796 #ifdef INET
 797         inp6 = (struct in6pcb *)so->so_pcb;
 798 #endif
 799         inp = (struct sctp_inpcb *)so->so_pcb;
 800         if (inp == NULL) {
 801                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 802                 return (ECONNRESET);    /* I made the same as TCP since we are
 803                                          * not setup? */
 804         }
 805         if (addr == NULL) {
 806                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 807                 return (EINVAL);
 808         }
 809         switch (addr->sa_family) {
 810 #ifdef INET
 811         case AF_INET:
 812                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 813                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 814                         return (EINVAL);
 815                 }
 816                 break;
 817 #endif
 818 #ifdef INET6
 819         case AF_INET6:
 820                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 821                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 822                         return (EINVAL);
 823                 }
 824                 break;
 825 #endif
 826         default:
 827                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 828                 return (EINVAL);
 829         }
 830
 831         vrf_id = inp->def_vrf_id;
 832         SCTP_ASOC_CREATE_LOCK(inp);
 833         SCTP_INP_RLOCK(inp);
 834         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 835             SCTP_PCB_FLAGS_UNBOUND) {
 836                 /* Bind a ephemeral port */
 837                 SCTP_INP_RUNLOCK(inp);
 838                 error = sctp6_bind(so, NULL, p);
 839                 if (error) {
 840                         SCTP_ASOC_CREATE_UNLOCK(inp);
 841
 842                         return (error);
 843                 }
 844                 SCTP_INP_RLOCK(inp);
 845         }
 846         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 847             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 848                 /* We are already connected AND the TCP model */
 849                 SCTP_INP_RUNLOCK(inp);
 850                 SCTP_ASOC_CREATE_UNLOCK(inp);
 851                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 852                 return (EADDRINUSE);
 853         }
 854 #ifdef INET
 855         sin6 = (struct sockaddr_in6 *)addr;
 856         if (SCTP_IPV6_V6ONLY(inp6)) {
 857                 /*
 858                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 859                  * addr or v4-mapped addr
 860                  */
 861                 if (addr->sa_family == AF_INET) {
 862                         SCTP_INP_RUNLOCK(inp);
 863                         SCTP_ASOC_CREATE_UNLOCK(inp);
 864                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 865                         return (EINVAL);
 866                 }
 867                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 868                         SCTP_INP_RUNLOCK(inp);
 869                         SCTP_ASOC_CREATE_UNLOCK(inp);
 870                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 871                         return (EINVAL);
 872                 }
 873         }
 874         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 875                 /* convert v4-mapped into v4 addr */
 876                 in6_sin6_2_sin(&store.sin, sin6);
 877                 addr = &store.sa;
 878         }
 879 #endif                          /* INET */
 880         /* Now do we connect? */
 881         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 882                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 883                 if (stcb) {
 884                         SCTP_TCB_UNLOCK(stcb);
 885                 }
 886                 SCTP_INP_RUNLOCK(inp);
 887         } else {
 888                 SCTP_INP_RUNLOCK(inp);
 889                 SCTP_INP_WLOCK(inp);
 890                 SCTP_INP_INCR_REF(inp);
 891                 SCTP_INP_WUNLOCK(inp);
 892                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 893                 if (stcb == NULL) {
 894                         SCTP_INP_WLOCK(inp);
 895                         SCTP_INP_DECR_REF(inp);
 896                         SCTP_INP_WUNLOCK(inp);
 897                 }
 898         }
 899
 900         if (stcb != NULL) {
 901                 /* Already have or am bring up an association */
 902                 SCTP_ASOC_CREATE_UNLOCK(inp);
 903                 SCTP_TCB_UNLOCK(stcb);
 904                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 905                 return (EALREADY);
 906         }
 907         /* We are GOOD to go */
 908         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
 909             inp->sctp_ep.pre_open_stream_count,
 910             inp->sctp_ep.port, p);
 911         SCTP_ASOC_CREATE_UNLOCK(inp);
 912         if (stcb == NULL) {
 913                 /* Gak! no memory */
 914                 return (error);
 915         }
 916         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 917                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 918                 /* Set the connected flag so we can queue data */
 919                 soisconnecting(so);
 920         }
 921         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
 922         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 923
 924         /* initialize authentication parameters for the assoc */
 925         sctp_initialize_auth_params(inp, stcb);
 926
 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 in6pcb *inp6 = sotoin6pcb(so);
1102         int error;
1103
1104         if (inp6 == NULL) {
1105                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1106                 return (EINVAL);
1107         }
1108         /* allow v6 addresses precedence */
1109         error = sctp6_getaddr(so, nam);
1110 #ifdef INET
1111         if (error) {
1112                 struct sockaddr_in6 *sin6;
1113
1114                 /* try v4 next if v6 failed */
1115                 error = sctp_ingetaddr(so, nam);
1116                 if (error) {
1117                         return (error);
1118                 }
1119                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1120                 if (sin6 == NULL) {
1121                         SCTP_FREE_SONAME(*nam);
1122                         return (ENOMEM);
1123                 }
1124                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1125                 SCTP_FREE_SONAME(*nam);
1126                 *nam = (struct sockaddr *)sin6;
1127         }
1128 #endif
1129         return (error);
1130 }
1131
1132
1133 static int
1134 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1135 {
1136         struct in6pcb *inp6 = sotoin6pcb(so);
1137         int error;
1138
1139         if (inp6 == NULL) {
1140                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1141                 return (EINVAL);
1142         }
1143         /* allow v6 addresses precedence */
1144         error = sctp6_peeraddr(so, nam);
1145 #ifdef INET
1146         if (error) {
1147                 struct sockaddr_in6 *sin6;
1148
1149                 /* try v4 next if v6 failed */
1150                 error = sctp_peeraddr(so, nam);
1151                 if (error) {
1152                         return (error);
1153                 }
1154                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1155                 if (sin6 == NULL) {
1156                         SCTP_FREE_SONAME(*nam);
1157                         return (ENOMEM);
1158                 }
1159                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1160                 SCTP_FREE_SONAME(*nam);
1161                 *nam = (struct sockaddr *)sin6;
1162         }
1163 #endif
1164         return (error);
1165 }
1166
1167 struct pr_usrreqs sctp6_usrreqs = {
1168         .pru_abort = sctp6_abort,
1169         .pru_accept = sctp_accept,
1170         .pru_attach = sctp6_attach,
1171         .pru_bind = sctp6_bind,
1172         .pru_connect = sctp6_connect,
1173         .pru_control = in6_control,
1174         .pru_close = sctp6_close,
1175         .pru_detach = sctp6_close,
1176         .pru_sopoll = sopoll_generic,
1177         .pru_flush = sctp_flush,
1178         .pru_disconnect = sctp6_disconnect,
1179         .pru_listen = sctp_listen,
1180         .pru_peeraddr = sctp6_getpeeraddr,
1181         .pru_send = sctp6_send,
1182         .pru_shutdown = sctp_shutdown,
1183         .pru_sockaddr = sctp6_in6getaddr,
1184         .pru_sosend = sctp_sosend,
1185         .pru_soreceive = sctp_soreceive
1186 };
1187
1188 #endif