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 = IPV6_TRAFFIC_CLASS(ip6);
 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 int
 168 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
 169 {
 170         return (sctp6_input_with_port(i_pak, offp, 0));
 171 }
 172
 173 void
 174 sctp6_notify(struct sctp_inpcb *inp,
 175     struct sctp_tcb *stcb,
 176     struct sctp_nets *net,
 177     uint8_t icmp6_type,
 178     uint8_t icmp6_code,
 179     uint32_t next_mtu)
 180 {
 181         int timer_stopped;
 182
 183         switch (icmp6_type) {
 184         case ICMP6_DST_UNREACH:
 185                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
 186                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
 187                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
 188                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
 189                         /* Mark the net unreachable. */
 190                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 191                                 /* Ok that destination is not reachable */
 192                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 193                                 net->dest_state &= ~SCTP_ADDR_PF;
 194                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 195                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 196                         }
 197                 }
 198                 SCTP_TCB_UNLOCK(stcb);
 199                 break;
 200         case ICMP6_PARAM_PROB:
 201                 /* Treat it like an ABORT. */
 202                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
 203                         sctp_abort_notification(stcb, true, false, 0, NULL, SCTP_SO_NOT_LOCKED);
 204                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 205                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 206                 } else {
 207                         SCTP_TCB_UNLOCK(stcb);
 208                 }
 209                 break;
 210         case ICMP6_PACKET_TOO_BIG:
 211                 if (net->dest_state & SCTP_ADDR_NO_PMTUD) {
 212                         SCTP_TCB_UNLOCK(stcb);
 213                         break;
 214                 }
 215                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
 216                         timer_stopped = 1;
 217                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
 218                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
 219                 } else {
 220                         timer_stopped = 0;
 221                 }
 222                 /* Update the path MTU. */
 223                 if (net->port) {
 224                         next_mtu -= sizeof(struct udphdr);
 225                 }
 226                 if (net->mtu > next_mtu) {
 227                         net->mtu = next_mtu;
 228                         if (net->port) {
 229                                 sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu + sizeof(struct udphdr));
 230                         } else {
 231                                 sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu);
 232                         }
 233                 }
 234                 /* Update the association MTU */
 235                 if (stcb->asoc.smallest_mtu > next_mtu) {
 236                         sctp_pathmtu_adjustment(stcb, next_mtu, true);
 237                 }
 238                 /* Finally, start the PMTU timer if it was running before. */
 239                 if (timer_stopped) {
 240                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 241                 }
 242                 SCTP_TCB_UNLOCK(stcb);
 243                 break;
 244         default:
 245                 SCTP_TCB_UNLOCK(stcb);
 246                 break;
 247         }
 248 }
 249
 250 void
 251 sctp6_ctlinput(struct ip6ctlparam *ip6cp)
 252 {
 253         struct sctp_inpcb *inp;
 254         struct sctp_tcb *stcb;
 255         struct sctp_nets *net;
 256         struct sctphdr sh;
 257         struct sockaddr_in6 src, dst;
 258
 259         if (icmp6_errmap(ip6cp->ip6c_icmp6) == 0) {
 260                 return;
 261         }
 262
 263         /*
 264          * Check if we can safely examine the ports and the verification tag
 265          * of the SCTP common header.
 266          */
 267         if (ip6cp->ip6c_m->m_pkthdr.len <
 268             (int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
 269                 return;
 270         }
 271
 272         /* Copy out the port numbers and the verification tag. */
 273         memset(&sh, 0, sizeof(sh));
 274         m_copydata(ip6cp->ip6c_m,
 275             ip6cp->ip6c_off,
 276             sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
 277             (caddr_t)&sh);
 278         memset(&src, 0, sizeof(struct sockaddr_in6));
 279         src.sin6_family = AF_INET6;
 280         src.sin6_len = sizeof(struct sockaddr_in6);
 281         src.sin6_port = sh.src_port;
 282         src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
 283         if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 284                 return;
 285         }
 286         memset(&dst, 0, sizeof(struct sockaddr_in6));
 287         dst.sin6_family = AF_INET6;
 288         dst.sin6_len = sizeof(struct sockaddr_in6);
 289         dst.sin6_port = sh.dest_port;
 290         dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
 291         if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 292                 return;
 293         }
 294         inp = NULL;
 295         net = NULL;
 296         stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
 297             (struct sockaddr *)&src,
 298             &inp, &net, 1, SCTP_DEFAULT_VRFID);
 299         if ((stcb != NULL) &&
 300             (net != NULL) &&
 301             (inp != NULL)) {
 302                 /* Check the verification tag */
 303                 if (ntohl(sh.v_tag) != 0) {
 304                         /*
 305                          * This must be the verification tag used for
 306                          * sending out packets. We don't consider packets
 307                          * reflecting the verification tag.
 308                          */
 309                         if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
 310                                 SCTP_TCB_UNLOCK(stcb);
 311                                 return;
 312                         }
 313                 } else {
 314                         if (ip6cp->ip6c_m->m_pkthdr.len >=
 315                             ip6cp->ip6c_off + sizeof(struct sctphdr) +
 316                             sizeof(struct sctp_chunkhdr) +
 317                             offsetof(struct sctp_init, a_rwnd)) {
 318                                 /*
 319                                  * In this case we can check if we got an
 320                                  * INIT chunk and if the initiate tag
 321                                  * matches.
 322                                  */
 323                                 uint32_t initiate_tag;
 324                                 uint8_t chunk_type;
 325
 326                                 m_copydata(ip6cp->ip6c_m,
 327                                     ip6cp->ip6c_off +
 328                                     sizeof(struct sctphdr),
 329                                     sizeof(uint8_t),
 330                                     (caddr_t)&chunk_type);
 331                                 m_copydata(ip6cp->ip6c_m,
 332                                     ip6cp->ip6c_off +
 333                                     sizeof(struct sctphdr) +
 334                                     sizeof(struct sctp_chunkhdr),
 335                                     sizeof(uint32_t),
 336                                     (caddr_t)&initiate_tag);
 337                                 if ((chunk_type != SCTP_INITIATION) ||
 338                                     (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
 339                                         SCTP_TCB_UNLOCK(stcb);
 340                                         return;
 341                                 }
 342                         } else {
 343                                 SCTP_TCB_UNLOCK(stcb);
 344                                 return;
 345                         }
 346                 }
 347                 sctp6_notify(inp, stcb, net,
 348                     ip6cp->ip6c_icmp6->icmp6_type,
 349                     ip6cp->ip6c_icmp6->icmp6_code,
 350                     ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
 351         } else {
 352                 if ((stcb == NULL) && (inp != NULL)) {
 353                         /* reduce inp's ref-count */
 354                         SCTP_INP_WLOCK(inp);
 355                         SCTP_INP_DECR_REF(inp);
 356                         SCTP_INP_WUNLOCK(inp);
 357                 }
 358                 if (stcb) {
 359                         SCTP_TCB_UNLOCK(stcb);
 360                 }
 361         }
 362 }
 363
 364 /*
 365  * this routine can probably be collasped into the one in sctp_userreq.c
 366  * since they do the same thing and now we lookup with a sockaddr
 367  */
 368 static int
 369 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 370 {
 371         struct xucred xuc;
 372         struct sockaddr_in6 addrs[2];
 373         struct sctp_inpcb *inp;
 374         struct sctp_nets *net;
 375         struct sctp_tcb *stcb;
 376         int error;
 377         uint32_t vrf_id;
 378
 379         vrf_id = SCTP_DEFAULT_VRFID;
 380
 381         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 382         if (error)
 383                 return (error);
 384
 385         if (req->newlen != sizeof(addrs)) {
 386                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 387                 return (EINVAL);
 388         }
 389         if (req->oldlen != sizeof(struct ucred)) {
 390                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 391                 return (EINVAL);
 392         }
 393         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 394         if (error)
 395                 return (error);
 396
 397         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 398             sin6tosa(&addrs[0]),
 399             &inp, &net, 1, vrf_id);
 400         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 401                 if ((inp != NULL) && (stcb == NULL)) {
 402                         /* reduce ref-count */
 403                         SCTP_INP_WLOCK(inp);
 404                         SCTP_INP_DECR_REF(inp);
 405                         goto cred_can_cont;
 406                 }
 407                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 408                 error = ENOENT;
 409                 goto out;
 410         }
 411         SCTP_TCB_UNLOCK(stcb);
 412         /*
 413          * We use the write lock here, only since in the error leg we need
 414          * it. If we used RLOCK, then we would have to
 415          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 416          * Better to use higher wlock.
 417          */
 418         SCTP_INP_WLOCK(inp);
 419 cred_can_cont:
 420         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 421         if (error) {
 422                 SCTP_INP_WUNLOCK(inp);
 423                 goto out;
 424         }
 425         cru2x(inp->sctp_socket->so_cred, &xuc);
 426         SCTP_INP_WUNLOCK(inp);
 427         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 428 out:
 429         return (error);
 430 }
 431
 432 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred,
 433     CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
 434     0, 0, sctp6_getcred, "S,ucred",
 435     "Get the ucred of a SCTP6 connection");
 436
 437 /* This is the same as the sctp_abort() could be made common */
 438 static void
 439 sctp6_abort(struct socket *so)
 440 {
 441         struct epoch_tracker et;
 442         struct sctp_inpcb *inp;
 443         uint32_t flags;
 444
 445         inp = (struct sctp_inpcb *)so->so_pcb;
 446         if (inp == NULL) {
 447                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 448                 return;
 449         }
 450         NET_EPOCH_ENTER(et);
 451 sctp_must_try_again:
 452         flags = inp->sctp_flags;
 453 #ifdef SCTP_LOG_CLOSING
 454         sctp_log_closing(inp, NULL, 17);
 455 #endif
 456         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 457             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 458 #ifdef SCTP_LOG_CLOSING
 459                 sctp_log_closing(inp, NULL, 16);
 460 #endif
 461                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 462                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 463                 SOCK_LOCK(so);
 464                 SCTP_SB_CLEAR(so->so_snd);
 465                 /*
 466                  * same for the rcv ones, they are only here for the
 467                  * accounting/select.
 468                  */
 469                 SCTP_SB_CLEAR(so->so_rcv);
 470                 /* Now null out the reference, we are completely detached. */
 471                 so->so_pcb = NULL;
 472                 SOCK_UNLOCK(so);
 473         } else {
 474                 flags = inp->sctp_flags;
 475                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 476                         goto sctp_must_try_again;
 477                 }
 478         }
 479         NET_EPOCH_EXIT(et);
 480         return;
 481 }
 482
 483 static int
 484 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 485 {
 486         int error;
 487         struct sctp_inpcb *inp;
 488         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 489
 490         inp = (struct sctp_inpcb *)so->so_pcb;
 491         if (inp != NULL) {
 492                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 493                 return (EINVAL);
 494         }
 495
 496         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 497                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 498                 if (error)
 499                         return (error);
 500         }
 501         error = sctp_inpcb_alloc(so, vrf_id);
 502         if (error)
 503                 return (error);
 504         inp = (struct sctp_inpcb *)so->so_pcb;
 505         SCTP_INP_WLOCK(inp);
 506         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 507
 508         inp->ip_inp.inp.inp_vflag |= INP_IPV6;
 509         inp->ip_inp.inp.in6p_hops = -1; /* use kernel default */
 510         inp->ip_inp.inp.in6p_cksum = -1;        /* just to be sure */
 511 #ifdef INET
 512         /*
 513          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 514          * socket as well, because the socket may be bound to an IPv6
 515          * wildcard address, which may match an IPv4-mapped IPv6 address.
 516          */
 517         inp->ip_inp.inp.inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 518 #endif
 519         SCTP_INP_WUNLOCK(inp);
 520         return (0);
 521 }
 522
 523 static int
 524 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 525 {
 526         struct sctp_inpcb *inp;
 527         int error;
 528         u_char vflagsav;
 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 (addr) {
 537                 switch (addr->sa_family) {
 538 #ifdef INET
 539                 case AF_INET:
 540                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 541                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 542                                 return (EINVAL);
 543                         }
 544                         break;
 545 #endif
 546 #ifdef INET6
 547                 case AF_INET6:
 548                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 549                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 550                                 return (EINVAL);
 551                         }
 552                         break;
 553 #endif
 554                 default:
 555                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 556                         return (EINVAL);
 557                 }
 558         }
 559         vflagsav = inp->ip_inp.inp.inp_vflag;
 560         inp->ip_inp.inp.inp_vflag &= ~INP_IPV4;
 561         inp->ip_inp.inp.inp_vflag |= INP_IPV6;
 562         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp) == 0)) {
 563                 switch (addr->sa_family) {
 564 #ifdef INET
 565                 case AF_INET:
 566                         /* binding v4 addr to v6 socket, so reset flags */
 567                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 568                         inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
 569                         break;
 570 #endif
 571 #ifdef INET6
 572                 case AF_INET6:
 573                         {
 574                                 struct sockaddr_in6 *sin6_p;
 575
 576                                 sin6_p = (struct sockaddr_in6 *)addr;
 577
 578                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 579                                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 580                                 }
 581 #ifdef INET
 582                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 583                                         struct sockaddr_in sin;
 584
 585                                         in6_sin6_2_sin(&sin, sin6_p);
 586                                         inp->ip_inp.inp.inp_vflag |= INP_IPV4;
 587                                         inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
 588                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 589                                         goto out;
 590                                 }
 591 #endif
 592                                 break;
 593                         }
 594 #endif
 595                 default:
 596                         break;
 597                 }
 598         } else if (addr != NULL) {
 599                 struct sockaddr_in6 *sin6_p;
 600
 601                 /* IPV6_V6ONLY socket */
 602 #ifdef INET
 603                 if (addr->sa_family == AF_INET) {
 604                         /* can't bind v4 addr to v6 only socket! */
 605                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 606                         error = EINVAL;
 607                         goto out;
 608                 }
 609 #endif
 610                 sin6_p = (struct sockaddr_in6 *)addr;
 611
 612                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 613                         /* can't bind v4-mapped addrs either! */
 614                         /* NOTE: we don't support SIIT */
 615                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 616                         error = EINVAL;
 617                         goto out;
 618                 }
 619         }
 620         error = sctp_inpcb_bind(so, addr, NULL, p);
 621 out:
 622         if (error != 0)
 623                 inp->ip_inp.inp.inp_vflag = vflagsav;
 624         return (error);
 625 }
 626
 627 static void
 628 sctp6_close(struct socket *so)
 629 {
 630         sctp_close(so);
 631 }
 632
 633 /* This could be made common with sctp_detach() since they are identical */
 634
 635 static
 636 int
 637 sctp6_disconnect(struct socket *so)
 638 {
 639         return (sctp_disconnect(so));
 640 }
 641
 642 int
 643 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 644     struct mbuf *control, struct thread *p);
 645
 646 static int
 647 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 648     struct mbuf *control, struct thread *p)
 649 {
 650         struct sctp_inpcb *inp;
 651
 652 #ifdef INET
 653         struct sockaddr_in6 *sin6;
 654 #endif                          /* INET */
 655         /* No SPL needed since sctp_output does this */
 656
 657         inp = (struct sctp_inpcb *)so->so_pcb;
 658         if (inp == NULL) {
 659                 if (control) {
 660                         SCTP_RELEASE_PKT(control);
 661                         control = NULL;
 662                 }
 663                 SCTP_RELEASE_PKT(m);
 664                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 665                 return (EINVAL);
 666         }
 667         /*
 668          * For the TCP model we may get a NULL addr, if we are a connected
 669          * socket thats ok.
 670          */
 671         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 672             (addr == NULL)) {
 673                 goto connected_type;
 674         }
 675         if (addr == NULL) {
 676                 SCTP_RELEASE_PKT(m);
 677                 if (control) {
 678                         SCTP_RELEASE_PKT(control);
 679                         control = NULL;
 680                 }
 681                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 682                 return (EDESTADDRREQ);
 683         }
 684         switch (addr->sa_family) {
 685 #ifdef INET
 686         case AF_INET:
 687                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 688                         if (control) {
 689                                 SCTP_RELEASE_PKT(control);
 690                                 control = NULL;
 691                         }
 692                         SCTP_RELEASE_PKT(m);
 693                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 694                         return (EINVAL);
 695                 }
 696                 break;
 697 #endif
 698 #ifdef INET6
 699         case AF_INET6:
 700                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 701                         if (control) {
 702                                 SCTP_RELEASE_PKT(control);
 703                                 control = NULL;
 704                         }
 705                         SCTP_RELEASE_PKT(m);
 706                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 707                         return (EINVAL);
 708                 }
 709                 break;
 710 #endif
 711         default:
 712                 if (control) {
 713                         SCTP_RELEASE_PKT(control);
 714                         control = NULL;
 715                 }
 716                 SCTP_RELEASE_PKT(m);
 717                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 718                 return (EINVAL);
 719         }
 720 #ifdef INET
 721         sin6 = (struct sockaddr_in6 *)addr;
 722         if (SCTP_IPV6_V6ONLY(inp)) {
 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                         if (control) {
 729                                 SCTP_RELEASE_PKT(control);
 730                                 control = NULL;
 731                         }
 732                         SCTP_RELEASE_PKT(m);
 733                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 734                         return (EINVAL);
 735                 }
 736                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 737                         if (control) {
 738                                 SCTP_RELEASE_PKT(control);
 739                                 control = NULL;
 740                         }
 741                         SCTP_RELEASE_PKT(m);
 742                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 743                         return (EINVAL);
 744                 }
 745         }
 746         if ((addr->sa_family == AF_INET6) &&
 747             IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 748                 struct sockaddr_in sin;
 749
 750                 /* convert v4-mapped into v4 addr and send */
 751                 in6_sin6_2_sin(&sin, sin6);
 752                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 753         }
 754 #endif                          /* INET */
 755 connected_type:
 756         /* now what about control */
 757         if (control) {
 758                 if (inp->control) {
 759                         SCTP_PRINTF("huh? control set?\n");
 760                         SCTP_RELEASE_PKT(inp->control);
 761                         inp->control = NULL;
 762                 }
 763                 inp->control = control;
 764         }
 765         /* Place the data */
 766         if (inp->pkt) {
 767                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 768                 inp->pkt_last = m;
 769         } else {
 770                 inp->pkt_last = inp->pkt = m;
 771         }
 772         if (
 773         /* FreeBSD and MacOSX uses a flag passed */
 774             ((flags & PRUS_MORETOCOME) == 0)
 775             ) {
 776                 /*
 777                  * note with the current version this code will only be used
 778                  * by OpenBSD, NetBSD and FreeBSD have methods for
 779                  * re-defining sosend() to use sctp_sosend().  One can
 780                  * optionaly switch back to this code (by changing back the
 781                  * defininitions but this is not advisable.
 782                  */
 783                 struct epoch_tracker et;
 784                 int ret;
 785
 786                 NET_EPOCH_ENTER(et);
 787                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 788                 NET_EPOCH_EXIT(et);
 789                 inp->pkt = NULL;
 790                 inp->control = NULL;
 791                 return (ret);
 792         } else {
 793                 return (0);
 794         }
 795 }
 796
 797 static int
 798 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 799 {
 800         struct epoch_tracker et;
 801         uint32_t vrf_id;
 802         int error = 0;
 803         struct sctp_inpcb *inp;
 804         struct sctp_tcb *stcb;
 805 #ifdef INET
 806         struct sockaddr_in6 *sin6;
 807         union sctp_sockstore store;
 808 #endif
 809
 810         inp = (struct sctp_inpcb *)so->so_pcb;
 811         if (inp == NULL) {
 812                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 813                 return (ECONNRESET);    /* I made the same as TCP since we are
 814                                          * not setup? */
 815         }
 816         if (addr == NULL) {
 817                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 818                 return (EINVAL);
 819         }
 820         switch (addr->sa_family) {
 821 #ifdef INET
 822         case AF_INET:
 823                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 824                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 825                         return (EINVAL);
 826                 }
 827                 break;
 828 #endif
 829 #ifdef INET6
 830         case AF_INET6:
 831                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 832                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 833                         return (EINVAL);
 834                 }
 835                 break;
 836 #endif
 837         default:
 838                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 839                 return (EINVAL);
 840         }
 841
 842         vrf_id = inp->def_vrf_id;
 843         SCTP_ASOC_CREATE_LOCK(inp);
 844         SCTP_INP_RLOCK(inp);
 845         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 846             SCTP_PCB_FLAGS_UNBOUND) {
 847                 /* Bind a ephemeral port */
 848                 SCTP_INP_RUNLOCK(inp);
 849                 error = sctp6_bind(so, NULL, p);
 850                 if (error) {
 851                         SCTP_ASOC_CREATE_UNLOCK(inp);
 852
 853                         return (error);
 854                 }
 855                 SCTP_INP_RLOCK(inp);
 856         }
 857         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 858             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 859                 /* We are already connected AND the TCP model */
 860                 SCTP_INP_RUNLOCK(inp);
 861                 SCTP_ASOC_CREATE_UNLOCK(inp);
 862                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 863                 return (EADDRINUSE);
 864         }
 865 #ifdef INET
 866         sin6 = (struct sockaddr_in6 *)addr;
 867         if (SCTP_IPV6_V6ONLY(inp)) {
 868                 /*
 869                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 870                  * addr or v4-mapped addr
 871                  */
 872                 if (addr->sa_family == AF_INET) {
 873                         SCTP_INP_RUNLOCK(inp);
 874                         SCTP_ASOC_CREATE_UNLOCK(inp);
 875                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 876                         return (EINVAL);
 877                 }
 878                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 879                         SCTP_INP_RUNLOCK(inp);
 880                         SCTP_ASOC_CREATE_UNLOCK(inp);
 881                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 882                         return (EINVAL);
 883                 }
 884         }
 885         if ((addr->sa_family == AF_INET6) &&
 886             IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 887                 /* convert v4-mapped into v4 addr */
 888                 in6_sin6_2_sin(&store.sin, sin6);
 889                 addr = &store.sa;
 890         }
 891 #endif                          /* INET */
 892         /* Now do we connect? */
 893         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 894                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 895                 if (stcb) {
 896                         SCTP_TCB_LOCK(stcb);
 897                 }
 898                 SCTP_INP_RUNLOCK(inp);
 899         } else {
 900                 SCTP_INP_RUNLOCK(inp);
 901                 SCTP_INP_WLOCK(inp);
 902                 SCTP_INP_INCR_REF(inp);
 903                 SCTP_INP_WUNLOCK(inp);
 904                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 905                 if (stcb == NULL) {
 906                         SCTP_INP_WLOCK(inp);
 907                         SCTP_INP_DECR_REF(inp);
 908                         SCTP_INP_WUNLOCK(inp);
 909                 }
 910         }
 911
 912         if (stcb != NULL) {
 913                 /* Already have or am bring up an association */
 914                 SCTP_ASOC_CREATE_UNLOCK(inp);
 915                 SCTP_TCB_UNLOCK(stcb);
 916                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 917                 return (EALREADY);
 918         }
 919         /* We are GOOD to go */
 920         stcb = sctp_aloc_assoc_connected(inp, addr, &error, 0, 0, vrf_id,
 921             inp->sctp_ep.pre_open_stream_count,
 922             inp->sctp_ep.port, p,
 923             SCTP_INITIALIZE_AUTH_PARAMS);
 924         SCTP_ASOC_CREATE_UNLOCK(inp);
 925         if (stcb == NULL) {
 926                 /* Gak! no memory */
 927                 return (error);
 928         }
 929         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
 930         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 931         NET_EPOCH_ENTER(et);
 932         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 933         SCTP_TCB_UNLOCK(stcb);
 934         NET_EPOCH_EXIT(et);
 935         return (error);
 936 }
 937
 938 static int
 939 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 940 {
 941         struct sockaddr_in6 *sin6;
 942         struct sctp_inpcb *inp;
 943         uint32_t vrf_id;
 944         struct sctp_ifa *sctp_ifa;
 945
 946         int error;
 947
 948         /*
 949          * Do the malloc first in case it blocks.
 950          */
 951         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 952         if (sin6 == NULL)
 953                 return (ENOMEM);
 954         sin6->sin6_family = AF_INET6;
 955         sin6->sin6_len = sizeof(*sin6);
 956
 957         inp = (struct sctp_inpcb *)so->so_pcb;
 958         if (inp == NULL) {
 959                 SCTP_FREE_SONAME(sin6);
 960                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 961                 return (ECONNRESET);
 962         }
 963         SCTP_INP_RLOCK(inp);
 964         sin6->sin6_port = inp->sctp_lport;
 965         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 966                 /* For the bound all case you get back 0 */
 967                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 968                         struct sctp_tcb *stcb;
 969                         struct sockaddr_in6 *sin_a6;
 970                         struct sctp_nets *net;
 971                         int fnd;
 972
 973                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 974                         if (stcb == NULL) {
 975                                 SCTP_INP_RUNLOCK(inp);
 976                                 SCTP_FREE_SONAME(sin6);
 977                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 978                                 return (ENOENT);
 979                         }
 980                         fnd = 0;
 981                         sin_a6 = NULL;
 982                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 983                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 984                                 if (sin_a6 == NULL)
 985                                         /* this will make coverity happy */
 986                                         continue;
 987
 988                                 if (sin_a6->sin6_family == AF_INET6) {
 989                                         fnd = 1;
 990                                         break;
 991                                 }
 992                         }
 993                         if ((!fnd) || (sin_a6 == NULL)) {
 994                                 /* punt */
 995                                 SCTP_INP_RUNLOCK(inp);
 996                                 SCTP_FREE_SONAME(sin6);
 997                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 998                                 return (ENOENT);
 999                         }
1000                         vrf_id = inp->def_vrf_id;
1001                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
1002                         if (sctp_ifa) {
1003                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1004                         }
1005                 } else {
1006                         /* For the bound all case you get back 0 */
1007                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1008                 }
1009         } else {
1010                 /* Take the first IPv6 address in the list */
1011                 struct sctp_laddr *laddr;
1012                 int fnd = 0;
1013
1014                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1015                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1016                                 struct sockaddr_in6 *sin_a;
1017
1018                                 sin_a = &laddr->ifa->address.sin6;
1019                                 sin6->sin6_addr = sin_a->sin6_addr;
1020                                 fnd = 1;
1021                                 break;
1022                         }
1023                 }
1024                 if (!fnd) {
1025                         SCTP_FREE_SONAME(sin6);
1026                         SCTP_INP_RUNLOCK(inp);
1027                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1028                         return (ENOENT);
1029                 }
1030         }
1031         SCTP_INP_RUNLOCK(inp);
1032         /* Scoping things for v6 */
1033         if ((error = sa6_recoverscope(sin6)) != 0) {
1034                 SCTP_FREE_SONAME(sin6);
1035                 return (error);
1036         }
1037         (*addr) = (struct sockaddr *)sin6;
1038         return (0);
1039 }
1040
1041 static int
1042 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1043 {
1044         struct sockaddr_in6 *sin6;
1045         int fnd;
1046         struct sockaddr_in6 *sin_a6;
1047         struct sctp_inpcb *inp;
1048         struct sctp_tcb *stcb;
1049         struct sctp_nets *net;
1050         int error;
1051
1052         /* Do the malloc first in case it blocks. */
1053         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1054         if (sin6 == NULL)
1055                 return (ENOMEM);
1056         sin6->sin6_family = AF_INET6;
1057         sin6->sin6_len = sizeof(*sin6);
1058
1059         inp = (struct sctp_inpcb *)so->so_pcb;
1060         if ((inp == NULL) ||
1061             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1062                 /* UDP type and listeners will drop out here */
1063                 SCTP_FREE_SONAME(sin6);
1064                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1065                 return (ENOTCONN);
1066         }
1067         SCTP_INP_RLOCK(inp);
1068         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1069         if (stcb) {
1070                 SCTP_TCB_LOCK(stcb);
1071         }
1072         SCTP_INP_RUNLOCK(inp);
1073         if (stcb == NULL) {
1074                 SCTP_FREE_SONAME(sin6);
1075                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1076                 return (ECONNRESET);
1077         }
1078         fnd = 0;
1079         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1080                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1081                 if (sin_a6->sin6_family == AF_INET6) {
1082                         fnd = 1;
1083                         sin6->sin6_port = stcb->rport;
1084                         sin6->sin6_addr = sin_a6->sin6_addr;
1085                         break;
1086                 }
1087         }
1088         SCTP_TCB_UNLOCK(stcb);
1089         if (!fnd) {
1090                 /* No IPv4 address */
1091                 SCTP_FREE_SONAME(sin6);
1092                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1093                 return (ENOENT);
1094         }
1095         if ((error = sa6_recoverscope(sin6)) != 0) {
1096                 SCTP_FREE_SONAME(sin6);
1097                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1098                 return (error);
1099         }
1100         *addr = (struct sockaddr *)sin6;
1101         return (0);
1102 }
1103
1104 static int
1105 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1106 {
1107         struct inpcb *inp = sotoinpcb(so);
1108         int error;
1109
1110         if (inp == NULL) {
1111                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1112                 return (EINVAL);
1113         }
1114
1115         /* allow v6 addresses precedence */
1116         error = sctp6_getaddr(so, nam);
1117 #ifdef INET
1118         if (error) {
1119                 struct sockaddr_in6 *sin6;
1120
1121                 /* try v4 next if v6 failed */
1122                 error = sctp_ingetaddr(so, nam);
1123                 if (error) {
1124                         return (error);
1125                 }
1126                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1127                 if (sin6 == NULL) {
1128                         SCTP_FREE_SONAME(*nam);
1129                         return (ENOMEM);
1130                 }
1131                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1132                 SCTP_FREE_SONAME(*nam);
1133                 *nam = (struct sockaddr *)sin6;
1134         }
1135 #endif
1136         return (error);
1137 }
1138
1139 static int
1140 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1141 {
1142         struct inpcb *inp = sotoinpcb(so);
1143         int error;
1144
1145         if (inp == NULL) {
1146                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1147                 return (EINVAL);
1148         }
1149
1150         /* allow v6 addresses precedence */
1151         error = sctp6_peeraddr(so, nam);
1152 #ifdef INET
1153         if (error) {
1154                 struct sockaddr_in6 *sin6;
1155
1156                 /* try v4 next if v6 failed */
1157                 error = sctp_peeraddr(so, nam);
1158                 if (error) {
1159                         return (error);
1160                 }
1161                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1162                 if (sin6 == NULL) {
1163                         SCTP_FREE_SONAME(*nam);
1164                         return (ENOMEM);
1165                 }
1166                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1167                 SCTP_FREE_SONAME(*nam);
1168                 *nam = (struct sockaddr *)sin6;
1169         }
1170 #endif
1171         return (error);
1172 }
1173
1174 #define SCTP6_PROTOSW                                                   \
1175         .pr_protocol =  IPPROTO_SCTP,                                   \
1176         .pr_ctloutput = sctp_ctloutput,                                 \
1177         .pr_abort =     sctp6_abort,                                    \
1178         .pr_accept =    sctp_accept,                                    \
1179         .pr_attach =    sctp6_attach,                                   \
1180         .pr_bind =      sctp6_bind,                                     \
1181         .pr_connect =   sctp6_connect,                                  \
1182         .pr_control =   in6_control,                                    \
1183         .pr_close =     sctp6_close,                                    \
1184         .pr_detach =    sctp6_close,                                    \
1185         .pr_sopoll =    sopoll_generic,                                 \
1186         .pr_flush =     sctp_flush,                                     \
1187         .pr_disconnect = sctp6_disconnect,                              \
1188         .pr_listen =    sctp_listen,                                    \
1189         .pr_peeraddr =  sctp6_getpeeraddr,                              \
1190         .pr_send =      sctp6_send,                                     \
1191         .pr_shutdown =  sctp_shutdown,                                  \
1192         .pr_sockaddr =  sctp6_in6getaddr,                               \
1193         .pr_sosend =    sctp_sosend,                                    \
1194         .pr_soreceive = sctp_soreceive
1195
1196 struct protosw sctp6_seqpacket_protosw = {
1197         .pr_type = SOCK_SEQPACKET,
1198         .pr_flags = PR_WANTRCVD,
1199         SCTP6_PROTOSW
1200 };
1201
1202 struct protosw sctp6_stream_protosw = {
1203         .pr_type = SOCK_STREAM,
1204         .pr_flags = PR_CONNREQUIRED | PR_WANTRCVD,
1205         SCTP6_PROTOSW
1206 };
1207 #endif