sys/netinet6/sctp6_usrreq.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
   4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * a) Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * b) Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the distribution.
  15  *
  16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <netinet/sctp_os.h>
  37 #ifdef INET6
  38 #include <sys/proc.h>
  39 #include <netinet/sctp_pcb.h>
  40 #include <netinet/sctp_header.h>
  41 #include <netinet/sctp_var.h>
  42 #include <netinet6/sctp6_var.h>
  43 #include <netinet/sctp_sysctl.h>
  44 #include <netinet/sctp_output.h>
  45 #include <netinet/sctp_uio.h>
  46 #include <netinet/sctp_asconf.h>
  47 #include <netinet/sctputil.h>
  48 #include <netinet/sctp_indata.h>
  49 #include <netinet/sctp_timer.h>
  50 #include <netinet/sctp_auth.h>
  51 #include <netinet/sctp_input.h>
  52 #include <netinet/sctp_output.h>
  53 #include <netinet/sctp_bsd_addr.h>
  54 #include <netinet/sctp_crc32.h>
  55 #include <netinet/icmp6.h>
  56 #include <netinet/udp.h>
  57
  58 #ifdef IPSEC
  59 #include <netipsec/ipsec.h>
  60 #include <netipsec/ipsec6.h>
  61 #endif                          /* IPSEC */
  62
  63 extern struct protosw inetsw[];
  64
  65 int
  66 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
  67 {
  68         struct mbuf *m;
  69         int iphlen;
  70         uint32_t vrf_id;
  71         uint8_t ecn_bits;
  72         struct sockaddr_in6 src, dst;
  73         struct ip6_hdr *ip6;
  74         struct sctphdr *sh;
  75         struct sctp_chunkhdr *ch;
  76         int length, offset;
  77
  78 #if !defined(SCTP_WITH_NO_CSUM)
  79         uint8_t compute_crc;
  80
  81 #endif
  82         uint32_t mflowid;
  83         uint8_t mflowtype;
  84         uint16_t fibnum;
  85
  86         iphlen = *offp;
  87         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  88                 SCTP_RELEASE_PKT(*i_pak);
  89                 return (IPPROTO_DONE);
  90         }
  91         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  92 #ifdef SCTP_MBUF_LOGGING
  93         /* Log in any input mbufs */
  94         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  95                 sctp_log_mbc(m, SCTP_MBUF_INPUT);
  96         }
  97 #endif
  98 #ifdef SCTP_PACKET_LOGGING
  99         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
 100                 sctp_packet_log(m);
 101         }
 102 #endif
 103         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 104             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
 105             m->m_pkthdr.len,
 106             if_name(m->m_pkthdr.rcvif),
 107             (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 108         mflowid = m->m_pkthdr.flowid;
 109         mflowtype = M_HASHTYPE_GET(m);
 110         fibnum = M_GETFIB(m);
 111         SCTP_STAT_INCR(sctps_recvpackets);
 112         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 113         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 114         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 115         ip6 = mtod(m, struct ip6_hdr *);
 116         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
 117             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
 118         if (sh == NULL) {
 119                 SCTP_STAT_INCR(sctps_hdrops);
 120                 return (IPPROTO_DONE);
 121         }
 122         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 123         offset -= sizeof(struct sctp_chunkhdr);
 124         memset(&src, 0, sizeof(struct sockaddr_in6));
 125         src.sin6_family = AF_INET6;
 126         src.sin6_len = sizeof(struct sockaddr_in6);
 127         src.sin6_port = sh->src_port;
 128         src.sin6_addr = ip6->ip6_src;
 129         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 130                 goto out;
 131         }
 132         memset(&dst, 0, sizeof(struct sockaddr_in6));
 133         dst.sin6_family = AF_INET6;
 134         dst.sin6_len = sizeof(struct sockaddr_in6);
 135         dst.sin6_port = sh->dest_port;
 136         dst.sin6_addr = ip6->ip6_dst;
 137         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 138                 goto out;
 139         }
 140         length = ntohs(ip6->ip6_plen) + iphlen;
 141         /* Validate mbuf chain length with IP payload length. */
 142         if (SCTP_HEADER_LEN(m) != length) {
 143                 SCTPDBG(SCTP_DEBUG_INPUT1,
 144                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 145                 SCTP_STAT_INCR(sctps_hdrops);
 146                 goto out;
 147         }
 148         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 149                 goto out;
 150         }
 151         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 152 #if defined(SCTP_WITH_NO_CSUM)
 153         SCTP_STAT_INCR(sctps_recvnocrc);
 154 #else
 155         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 156                 SCTP_STAT_INCR(sctps_recvhwcrc);
 157                 compute_crc = 0;
 158         } else {
 159                 SCTP_STAT_INCR(sctps_recvswcrc);
 160                 compute_crc = 1;
 161         }
 162 #endif
 163         sctp_common_input_processing(&m, iphlen, offset, length,
 164             (struct sockaddr *)&src,
 165             (struct sockaddr *)&dst,
 166             sh, ch,
 167 #if !defined(SCTP_WITH_NO_CSUM)
 168             compute_crc,
 169 #endif
 170             ecn_bits,
 171             mflowtype, mflowid, fibnum,
 172             vrf_id, port);
 173 out:
 174         if (m) {
 175                 sctp_m_freem(m);
 176         }
 177         return (IPPROTO_DONE);
 178 }
 179
 180
 181 int
 182 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
 183 {
 184         return (sctp6_input_with_port(i_pak, offp, 0));
 185 }
 186
 187 void
 188 sctp6_notify(struct sctp_inpcb *inp,
 189     struct sctp_tcb *stcb,
 190     struct sctp_nets *net,
 191     uint8_t icmp6_type,
 192     uint8_t icmp6_code,
 193     uint16_t next_mtu)
 194 {
 195 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 196         struct socket *so;
 197
 198 #endif
 199         int timer_stopped;
 200
 201         switch (icmp6_type) {
 202         case ICMP6_DST_UNREACH:
 203                 if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
 204                     (icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
 205                     (icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
 206                     (icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
 207                         /* Mark the net unreachable. */
 208                         if (net->dest_state & SCTP_ADDR_REACHABLE) {
 209                                 /* Ok that destination is not reachable */
 210                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 211                                 net->dest_state &= ~SCTP_ADDR_PF;
 212                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 213                                     stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 214                         }
 215                 }
 216                 SCTP_TCB_UNLOCK(stcb);
 217                 break;
 218         case ICMP6_PARAM_PROB:
 219                 /* Treat it like an ABORT. */
 220                 if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
 221                         sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 222 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 223                         so = SCTP_INP_SO(inp);
 224                         atomic_add_int(&stcb->asoc.refcnt, 1);
 225                         SCTP_TCB_UNLOCK(stcb);
 226                         SCTP_SOCKET_LOCK(so, 1);
 227                         SCTP_TCB_LOCK(stcb);
 228                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 229 #endif
 230                         (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
 231                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 233                         SCTP_SOCKET_UNLOCK(so, 1);
 234 #endif
 235                 } else {
 236                         SCTP_TCB_UNLOCK(stcb);
 237                 }
 238                 break;
 239         case ICMP6_PACKET_TOO_BIG:
 240                 if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
 241                         timer_stopped = 1;
 242                         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
 243                             SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
 244                 } else {
 245                         timer_stopped = 0;
 246                 }
 247                 /* Update the path MTU. */
 248                 if (net->mtu > next_mtu) {
 249                         net->mtu = next_mtu;
 250                         if (net->port) {
 251                                 net->mtu -= sizeof(struct udphdr);
 252                         }
 253                 }
 254                 /* Update the association MTU */
 255                 if (stcb->asoc.smallest_mtu > next_mtu) {
 256                         sctp_pathmtu_adjustment(stcb, next_mtu);
 257                 }
 258                 /* Finally, start the PMTU timer if it was running before. */
 259                 if (timer_stopped) {
 260                         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
 261                 }
 262                 SCTP_TCB_UNLOCK(stcb);
 263                 break;
 264         default:
 265                 SCTP_TCB_UNLOCK(stcb);
 266                 break;
 267         }
 268 }
 269
 270 void
 271 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 272 {
 273         struct ip6ctlparam *ip6cp;
 274         struct sctp_inpcb *inp;
 275         struct sctp_tcb *stcb;
 276         struct sctp_nets *net;
 277         struct sctphdr sh;
 278         struct sockaddr_in6 src, dst;
 279
 280         if (pktdst->sa_family != AF_INET6 ||
 281             pktdst->sa_len != sizeof(struct sockaddr_in6)) {
 282                 return;
 283         }
 284         if ((unsigned)cmd >= PRC_NCMDS) {
 285                 return;
 286         }
 287         if (PRC_IS_REDIRECT(cmd)) {
 288                 d = NULL;
 289         } else if (inet6ctlerrmap[cmd] == 0) {
 290                 return;
 291         }
 292         /* If the parameter is from icmp6, decode it. */
 293         if (d != NULL) {
 294                 ip6cp = (struct ip6ctlparam *)d;
 295         } else {
 296                 ip6cp = (struct ip6ctlparam *)NULL;
 297         }
 298
 299         if (ip6cp != NULL) {
 300                 /*
 301                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 302                  * valid.
 303                  */
 304                 if (ip6cp->ip6c_m == NULL) {
 305                         return;
 306                 }
 307                 /*
 308                  * Check if we can safely examine the ports and the
 309                  * verification tag of the SCTP common header.
 310                  */
 311                 if (ip6cp->ip6c_m->m_pkthdr.len <
 312                     (int32_t) (ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
 313                         return;
 314                 }
 315                 /* Copy out the port numbers and the verification tag. */
 316                 bzero(&sh, sizeof(sh));
 317                 m_copydata(ip6cp->ip6c_m,
 318                     ip6cp->ip6c_off,
 319                     sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
 320                     (caddr_t)&sh);
 321                 memset(&src, 0, sizeof(struct sockaddr_in6));
 322                 src.sin6_family = AF_INET6;
 323                 src.sin6_len = sizeof(struct sockaddr_in6);
 324                 src.sin6_port = sh.src_port;
 325                 src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
 326                 if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 327                         return;
 328                 }
 329                 memset(&dst, 0, sizeof(struct sockaddr_in6));
 330                 dst.sin6_family = AF_INET6;
 331                 dst.sin6_len = sizeof(struct sockaddr_in6);
 332                 dst.sin6_port = sh.dest_port;
 333                 dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
 334                 if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
 335                         return;
 336                 }
 337                 inp = NULL;
 338                 net = NULL;
 339                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
 340                     (struct sockaddr *)&src,
 341                     &inp, &net, 1, SCTP_DEFAULT_VRFID);
 342                 if ((stcb != NULL) &&
 343                     (net != NULL) &&
 344                     (inp != NULL) &&
 345                     (inp->sctp_socket != NULL)) {
 346                         /* Check the verification tag */
 347                         if (ntohl(sh.v_tag) != 0) {
 348                                 /*
 349                                  * This must be the verification tag used
 350                                  * for sending out packets. We don't
 351                                  * consider packets reflecting the
 352                                  * verification tag.
 353                                  */
 354                                 if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
 355                                         SCTP_TCB_UNLOCK(stcb);
 356                                         return;
 357                                 }
 358                         } else {
 359                                 if (ip6cp->ip6c_m->m_pkthdr.len >=
 360                                     ip6cp->ip6c_off + sizeof(struct sctphdr) +
 361                                     sizeof(struct sctp_chunkhdr) +
 362                                     offsetof(struct sctp_init, a_rwnd)) {
 363                                         /*
 364                                          * In this case we can check if we
 365                                          * got an INIT chunk and if the
 366                                          * initiate tag matches.
 367                                          */
 368                                         uint32_t initiate_tag;
 369                                         uint8_t chunk_type;
 370
 371                                         m_copydata(ip6cp->ip6c_m,
 372                                             ip6cp->ip6c_off +
 373                                             sizeof(struct sctphdr),
 374                                             sizeof(uint8_t),
 375                                             (caddr_t)&chunk_type);
 376                                         m_copydata(ip6cp->ip6c_m,
 377                                             ip6cp->ip6c_off +
 378                                             sizeof(struct sctphdr) +
 379                                             sizeof(struct sctp_chunkhdr),
 380                                             sizeof(uint32_t),
 381                                             (caddr_t)&initiate_tag);
 382                                         if ((chunk_type != SCTP_INITIATION) ||
 383                                             (ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
 384                                                 SCTP_TCB_UNLOCK(stcb);
 385                                                 return;
 386                                         }
 387                                 } else {
 388                                         SCTP_TCB_UNLOCK(stcb);
 389                                         return;
 390                                 }
 391                         }
 392                         sctp6_notify(inp, stcb, net,
 393                             ip6cp->ip6c_icmp6->icmp6_type,
 394                             ip6cp->ip6c_icmp6->icmp6_code,
 395                             (uint16_t) ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
 396                 } else {
 397                         if ((stcb == NULL) && (inp != NULL)) {
 398                                 /* reduce inp's ref-count */
 399                                 SCTP_INP_WLOCK(inp);
 400                                 SCTP_INP_DECR_REF(inp);
 401                                 SCTP_INP_WUNLOCK(inp);
 402                         }
 403                         if (stcb) {
 404                                 SCTP_TCB_UNLOCK(stcb);
 405                         }
 406                 }
 407         }
 408 }
 409
 410 /*
 411  * this routine can probably be collasped into the one in sctp_userreq.c
 412  * since they do the same thing and now we lookup with a sockaddr
 413  */
 414 static int
 415 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 416 {
 417         struct xucred xuc;
 418         struct sockaddr_in6 addrs[2];
 419         struct sctp_inpcb *inp;
 420         struct sctp_nets *net;
 421         struct sctp_tcb *stcb;
 422         int error;
 423         uint32_t vrf_id;
 424
 425         vrf_id = SCTP_DEFAULT_VRFID;
 426
 427         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 428         if (error)
 429                 return (error);
 430
 431         if (req->newlen != sizeof(addrs)) {
 432                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 433                 return (EINVAL);
 434         }
 435         if (req->oldlen != sizeof(struct ucred)) {
 436                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 437                 return (EINVAL);
 438         }
 439         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 440         if (error)
 441                 return (error);
 442
 443         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 444             sin6tosa(&addrs[0]),
 445             &inp, &net, 1, vrf_id);
 446         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 447                 if ((inp != NULL) && (stcb == NULL)) {
 448                         /* reduce ref-count */
 449                         SCTP_INP_WLOCK(inp);
 450                         SCTP_INP_DECR_REF(inp);
 451                         goto cred_can_cont;
 452                 }
 453                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 454                 error = ENOENT;
 455                 goto out;
 456         }
 457         SCTP_TCB_UNLOCK(stcb);
 458         /*
 459          * We use the write lock here, only since in the error leg we need
 460          * it. If we used RLOCK, then we would have to
 461          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 462          * Better to use higher wlock.
 463          */
 464         SCTP_INP_WLOCK(inp);
 465 cred_can_cont:
 466         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 467         if (error) {
 468                 SCTP_INP_WUNLOCK(inp);
 469                 goto out;
 470         }
 471         cru2x(inp->sctp_socket->so_cred, &xuc);
 472         SCTP_INP_WUNLOCK(inp);
 473         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 474 out:
 475         return (error);
 476 }
 477
 478 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 479     0, 0,
 480     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 481
 482
 483 /* This is the same as the sctp_abort() could be made common */
 484 static void
 485 sctp6_abort(struct socket *so)
 486 {
 487         struct sctp_inpcb *inp;
 488         uint32_t flags;
 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;
 494         }
 495 sctp_must_try_again:
 496         flags = inp->sctp_flags;
 497 #ifdef SCTP_LOG_CLOSING
 498         sctp_log_closing(inp, NULL, 17);
 499 #endif
 500         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 501             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 502 #ifdef SCTP_LOG_CLOSING
 503                 sctp_log_closing(inp, NULL, 16);
 504 #endif
 505                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 506                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 507                 SOCK_LOCK(so);
 508                 SCTP_SB_CLEAR(so->so_snd);
 509                 /*
 510                  * same for the rcv ones, they are only here for the
 511                  * accounting/select.
 512                  */
 513                 SCTP_SB_CLEAR(so->so_rcv);
 514                 /* Now null out the reference, we are completely detached. */
 515                 so->so_pcb = NULL;
 516                 SOCK_UNLOCK(so);
 517         } else {
 518                 flags = inp->sctp_flags;
 519                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 520                         goto sctp_must_try_again;
 521                 }
 522         }
 523         return;
 524 }
 525
 526 static int
 527 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 528 {
 529         struct in6pcb *inp6;
 530         int error;
 531         struct sctp_inpcb *inp;
 532         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 533
 534         inp = (struct sctp_inpcb *)so->so_pcb;
 535         if (inp != NULL) {
 536                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 537                 return (EINVAL);
 538         }
 539         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 540                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 541                 if (error)
 542                         return (error);
 543         }
 544         error = sctp_inpcb_alloc(so, vrf_id);
 545         if (error)
 546                 return (error);
 547         inp = (struct sctp_inpcb *)so->so_pcb;
 548         SCTP_INP_WLOCK(inp);
 549         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 550         inp6 = (struct in6pcb *)inp;
 551
 552         inp6->inp_vflag |= INP_IPV6;
 553         inp6->in6p_hops = -1;   /* use kernel default */
 554         inp6->in6p_cksum = -1;  /* just to be sure */
 555 #ifdef INET
 556         /*
 557          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 558          * socket as well, because the socket may be bound to an IPv6
 559          * wildcard address, which may match an IPv4-mapped IPv6 address.
 560          */
 561         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 562 #endif
 563         /*
 564          * Hmm what about the IPSEC stuff that is missing here but in
 565          * sctp_attach()?
 566          */
 567         SCTP_INP_WUNLOCK(inp);
 568         return (0);
 569 }
 570
 571 static int
 572 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 573 {
 574         struct sctp_inpcb *inp;
 575         struct in6pcb *inp6;
 576         int error;
 577
 578         inp = (struct sctp_inpcb *)so->so_pcb;
 579         if (inp == NULL) {
 580                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 581                 return (EINVAL);
 582         }
 583         if (addr) {
 584                 switch (addr->sa_family) {
 585 #ifdef INET
 586                 case AF_INET:
 587                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 588                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 589                                 return (EINVAL);
 590                         }
 591                         break;
 592 #endif
 593 #ifdef INET6
 594                 case AF_INET6:
 595                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 596                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 597                                 return (EINVAL);
 598                         }
 599                         break;
 600 #endif
 601                 default:
 602                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 603                         return (EINVAL);
 604                 }
 605         }
 606         inp6 = (struct in6pcb *)inp;
 607         inp6->inp_vflag &= ~INP_IPV4;
 608         inp6->inp_vflag |= INP_IPV6;
 609         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 610                 switch (addr->sa_family) {
 611 #ifdef INET
 612                 case AF_INET:
 613                         /* binding v4 addr to v6 socket, so reset flags */
 614                         inp6->inp_vflag |= INP_IPV4;
 615                         inp6->inp_vflag &= ~INP_IPV6;
 616                         break;
 617 #endif
 618 #ifdef INET6
 619                 case AF_INET6:
 620                         {
 621                                 struct sockaddr_in6 *sin6_p;
 622
 623                                 sin6_p = (struct sockaddr_in6 *)addr;
 624
 625                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 626                                         inp6->inp_vflag |= INP_IPV4;
 627                                 }
 628 #ifdef INET
 629                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 630                                         struct sockaddr_in sin;
 631
 632                                         in6_sin6_2_sin(&sin, sin6_p);
 633                                         inp6->inp_vflag |= INP_IPV4;
 634                                         inp6->inp_vflag &= ~INP_IPV6;
 635                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 636                                         return (error);
 637                                 }
 638 #endif
 639                                 break;
 640                         }
 641 #endif
 642                 default:
 643                         break;
 644                 }
 645         } else if (addr != NULL) {
 646                 struct sockaddr_in6 *sin6_p;
 647
 648                 /* IPV6_V6ONLY socket */
 649 #ifdef INET
 650                 if (addr->sa_family == AF_INET) {
 651                         /* can't bind v4 addr to v6 only socket! */
 652                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 653                         return (EINVAL);
 654                 }
 655 #endif
 656                 sin6_p = (struct sockaddr_in6 *)addr;
 657
 658                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 659                         /* can't bind v4-mapped addrs either! */
 660                         /* NOTE: we don't support SIIT */
 661                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 662                         return (EINVAL);
 663                 }
 664         }
 665         error = sctp_inpcb_bind(so, addr, NULL, p);
 666         return (error);
 667 }
 668
 669
 670 static void
 671 sctp6_close(struct socket *so)
 672 {
 673         sctp_close(so);
 674 }
 675
 676 /* This could be made common with sctp_detach() since they are identical */
 677
 678 static
 679 int
 680 sctp6_disconnect(struct socket *so)
 681 {
 682         return (sctp_disconnect(so));
 683 }
 684
 685
 686 int
 687 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 688     struct mbuf *control, struct thread *p);
 689
 690
 691 static int
 692 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 693     struct mbuf *control, struct thread *p)
 694 {
 695         struct sctp_inpcb *inp;
 696         struct in6pcb *inp6;
 697
 698 #ifdef INET
 699         struct sockaddr_in6 *sin6;
 700
 701 #endif                          /* INET */
 702         /* No SPL needed since sctp_output does this */
 703
 704         inp = (struct sctp_inpcb *)so->so_pcb;
 705         if (inp == NULL) {
 706                 if (control) {
 707                         SCTP_RELEASE_PKT(control);
 708                         control = NULL;
 709                 }
 710                 SCTP_RELEASE_PKT(m);
 711                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 712                 return (EINVAL);
 713         }
 714         inp6 = (struct in6pcb *)inp;
 715         /*
 716          * For the TCP model we may get a NULL addr, if we are a connected
 717          * socket thats ok.
 718          */
 719         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 720             (addr == NULL)) {
 721                 goto connected_type;
 722         }
 723         if (addr == NULL) {
 724                 SCTP_RELEASE_PKT(m);
 725                 if (control) {
 726                         SCTP_RELEASE_PKT(control);
 727                         control = NULL;
 728                 }
 729                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 730                 return (EDESTADDRREQ);
 731         }
 732 #ifdef INET
 733         sin6 = (struct sockaddr_in6 *)addr;
 734         if (SCTP_IPV6_V6ONLY(inp6)) {
 735                 /*
 736                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 737                  * v4 addr or v4-mapped addr
 738                  */
 739                 if (addr->sa_family == AF_INET) {
 740                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 741                         return (EINVAL);
 742                 }
 743                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 744                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 745                         return (EINVAL);
 746                 }
 747         }
 748         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 749                 struct sockaddr_in sin;
 750
 751                 /* convert v4-mapped into v4 addr and send */
 752                 in6_sin6_2_sin(&sin, sin6);
 753                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 754         }
 755 #endif                          /* INET */
 756 connected_type:
 757         /* now what about control */
 758         if (control) {
 759                 if (inp->control) {
 760                         SCTP_PRINTF("huh? control set?\n");
 761                         SCTP_RELEASE_PKT(inp->control);
 762                         inp->control = NULL;
 763                 }
 764                 inp->control = control;
 765         }
 766         /* Place the data */
 767         if (inp->pkt) {
 768                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 769                 inp->pkt_last = m;
 770         } else {
 771                 inp->pkt_last = inp->pkt = m;
 772         }
 773         if (
 774         /* FreeBSD and MacOSX uses a flag passed */
 775             ((flags & PRUS_MORETOCOME) == 0)
 776             ) {
 777                 /*
 778                  * note with the current version this code will only be used
 779                  * by OpenBSD, NetBSD and FreeBSD have methods for
 780                  * re-defining sosend() to use sctp_sosend().  One can
 781                  * optionaly switch back to this code (by changing back the
 782                  * defininitions but this is not advisable.
 783                  */
 784                 int ret;
 785
 786                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 787                 inp->pkt = NULL;
 788                 inp->control = NULL;
 789                 return (ret);
 790         } else {
 791                 return (0);
 792         }
 793 }
 794
 795 static int
 796 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 797 {
 798         uint32_t vrf_id;
 799         int error = 0;
 800         struct sctp_inpcb *inp;
 801         struct sctp_tcb *stcb;
 802
 803 #ifdef INET
 804         struct in6pcb *inp6;
 805         struct sockaddr_in6 *sin6;
 806         union sctp_sockstore store;
 807
 808 #endif
 809
 810 #ifdef INET
 811         inp6 = (struct in6pcb *)so->so_pcb;
 812 #endif
 813         inp = (struct sctp_inpcb *)so->so_pcb;
 814         if (inp == NULL) {
 815                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 816                 return (ECONNRESET);    /* I made the same as TCP since we are
 817                                          * not setup? */
 818         }
 819         if (addr == NULL) {
 820                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 821                 return (EINVAL);
 822         }
 823         switch (addr->sa_family) {
 824 #ifdef INET
 825         case AF_INET:
 826                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 827                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 828                         return (EINVAL);
 829                 }
 830                 break;
 831 #endif
 832 #ifdef INET6
 833         case AF_INET6:
 834                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 835                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 836                         return (EINVAL);
 837                 }
 838                 break;
 839 #endif
 840         default:
 841                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 842                 return (EINVAL);
 843         }
 844
 845         vrf_id = inp->def_vrf_id;
 846         SCTP_ASOC_CREATE_LOCK(inp);
 847         SCTP_INP_RLOCK(inp);
 848         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 849             SCTP_PCB_FLAGS_UNBOUND) {
 850                 /* Bind a ephemeral port */
 851                 SCTP_INP_RUNLOCK(inp);
 852                 error = sctp6_bind(so, NULL, p);
 853                 if (error) {
 854                         SCTP_ASOC_CREATE_UNLOCK(inp);
 855
 856                         return (error);
 857                 }
 858                 SCTP_INP_RLOCK(inp);
 859         }
 860         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 861             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 862                 /* We are already connected AND the TCP model */
 863                 SCTP_INP_RUNLOCK(inp);
 864                 SCTP_ASOC_CREATE_UNLOCK(inp);
 865                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 866                 return (EADDRINUSE);
 867         }
 868 #ifdef INET
 869         sin6 = (struct sockaddr_in6 *)addr;
 870         if (SCTP_IPV6_V6ONLY(inp6)) {
 871                 /*
 872                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 873                  * addr or v4-mapped addr
 874                  */
 875                 if (addr->sa_family == AF_INET) {
 876                         SCTP_INP_RUNLOCK(inp);
 877                         SCTP_ASOC_CREATE_UNLOCK(inp);
 878                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 879                         return (EINVAL);
 880                 }
 881                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 882                         SCTP_INP_RUNLOCK(inp);
 883                         SCTP_ASOC_CREATE_UNLOCK(inp);
 884                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 885                         return (EINVAL);
 886                 }
 887         }
 888         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 889                 /* convert v4-mapped into v4 addr */
 890                 in6_sin6_2_sin(&store.sin, sin6);
 891                 addr = &store.sa;
 892         }
 893 #endif                          /* INET */
 894         /* Now do we connect? */
 895         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 896                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 897                 if (stcb) {
 898                         SCTP_TCB_UNLOCK(stcb);
 899                 }
 900                 SCTP_INP_RUNLOCK(inp);
 901         } else {
 902                 SCTP_INP_RUNLOCK(inp);
 903                 SCTP_INP_WLOCK(inp);
 904                 SCTP_INP_INCR_REF(inp);
 905                 SCTP_INP_WUNLOCK(inp);
 906                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 907                 if (stcb == NULL) {
 908                         SCTP_INP_WLOCK(inp);
 909                         SCTP_INP_DECR_REF(inp);
 910                         SCTP_INP_WUNLOCK(inp);
 911                 }
 912         }
 913
 914         if (stcb != NULL) {
 915                 /* Already have or am bring up an association */
 916                 SCTP_ASOC_CREATE_UNLOCK(inp);
 917                 SCTP_TCB_UNLOCK(stcb);
 918                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 919                 return (EALREADY);
 920         }
 921         /* We are GOOD to go */
 922         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
 923             inp->sctp_ep.pre_open_stream_count,
 924             inp->sctp_ep.port, p);
 925         SCTP_ASOC_CREATE_UNLOCK(inp);
 926         if (stcb == NULL) {
 927                 /* Gak! no memory */
 928                 return (error);
 929         }
 930         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 931                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 932                 /* Set the connected flag so we can queue data */
 933                 soisconnecting(so);
 934         }
 935         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
 936         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 937
 938         /* initialize authentication parameters for the assoc */
 939         sctp_initialize_auth_params(inp, stcb);
 940
 941         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 942         SCTP_TCB_UNLOCK(stcb);
 943         return (error);
 944 }
 945
 946 static int
 947 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 948 {
 949         struct sockaddr_in6 *sin6;
 950         struct sctp_inpcb *inp;
 951         uint32_t vrf_id;
 952         struct sctp_ifa *sctp_ifa;
 953
 954         int error;
 955
 956         /*
 957          * Do the malloc first in case it blocks.
 958          */
 959         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
 960         if (sin6 == NULL)
 961                 return (ENOMEM);
 962         sin6->sin6_family = AF_INET6;
 963         sin6->sin6_len = sizeof(*sin6);
 964
 965         inp = (struct sctp_inpcb *)so->so_pcb;
 966         if (inp == NULL) {
 967                 SCTP_FREE_SONAME(sin6);
 968                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 969                 return (ECONNRESET);
 970         }
 971         SCTP_INP_RLOCK(inp);
 972         sin6->sin6_port = inp->sctp_lport;
 973         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 974                 /* For the bound all case you get back 0 */
 975                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 976                         struct sctp_tcb *stcb;
 977                         struct sockaddr_in6 *sin_a6;
 978                         struct sctp_nets *net;
 979                         int fnd;
 980
 981                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
 982                         if (stcb == NULL) {
 983                                 SCTP_INP_RUNLOCK(inp);
 984                                 SCTP_FREE_SONAME(sin6);
 985                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 986                                 return (ENOENT);
 987                         }
 988                         fnd = 0;
 989                         sin_a6 = NULL;
 990                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 991                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 992                                 if (sin_a6 == NULL)
 993                                         /* this will make coverity happy */
 994                                         continue;
 995
 996                                 if (sin_a6->sin6_family == AF_INET6) {
 997                                         fnd = 1;
 998                                         break;
 999                                 }
1000                         }
1001                         if ((!fnd) || (sin_a6 == NULL)) {
1002                                 /* punt */
1003                                 SCTP_INP_RUNLOCK(inp);
1004                                 SCTP_FREE_SONAME(sin6);
1005                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1006                                 return (ENOENT);
1007                         }
1008                         vrf_id = inp->def_vrf_id;
1009                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1010                         if (sctp_ifa) {
1011                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1012                         }
1013                 } else {
1014                         /* For the bound all case you get back 0 */
1015                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1016                 }
1017         } else {
1018                 /* Take the first IPv6 address in the list */
1019                 struct sctp_laddr *laddr;
1020                 int fnd = 0;
1021
1022                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1023                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1024                                 struct sockaddr_in6 *sin_a;
1025
1026                                 sin_a = &laddr->ifa->address.sin6;
1027                                 sin6->sin6_addr = sin_a->sin6_addr;
1028                                 fnd = 1;
1029                                 break;
1030                         }
1031                 }
1032                 if (!fnd) {
1033                         SCTP_FREE_SONAME(sin6);
1034                         SCTP_INP_RUNLOCK(inp);
1035                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1036                         return (ENOENT);
1037                 }
1038         }
1039         SCTP_INP_RUNLOCK(inp);
1040         /* Scoping things for v6 */
1041         if ((error = sa6_recoverscope(sin6)) != 0) {
1042                 SCTP_FREE_SONAME(sin6);
1043                 return (error);
1044         }
1045         (*addr) = (struct sockaddr *)sin6;
1046         return (0);
1047 }
1048
1049 static int
1050 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1051 {
1052         struct sockaddr_in6 *sin6;
1053         int fnd;
1054         struct sockaddr_in6 *sin_a6;
1055         struct sctp_inpcb *inp;
1056         struct sctp_tcb *stcb;
1057         struct sctp_nets *net;
1058         int error;
1059
1060         /* Do the malloc first in case it blocks. */
1061         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1062         if (sin6 == NULL)
1063                 return (ENOMEM);
1064         sin6->sin6_family = AF_INET6;
1065         sin6->sin6_len = sizeof(*sin6);
1066
1067         inp = (struct sctp_inpcb *)so->so_pcb;
1068         if ((inp == NULL) ||
1069             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1070                 /* UDP type and listeners will drop out here */
1071                 SCTP_FREE_SONAME(sin6);
1072                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1073                 return (ENOTCONN);
1074         }
1075         SCTP_INP_RLOCK(inp);
1076         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1077         if (stcb) {
1078                 SCTP_TCB_LOCK(stcb);
1079         }
1080         SCTP_INP_RUNLOCK(inp);
1081         if (stcb == NULL) {
1082                 SCTP_FREE_SONAME(sin6);
1083                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1084                 return (ECONNRESET);
1085         }
1086         fnd = 0;
1087         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1088                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1089                 if (sin_a6->sin6_family == AF_INET6) {
1090                         fnd = 1;
1091                         sin6->sin6_port = stcb->rport;
1092                         sin6->sin6_addr = sin_a6->sin6_addr;
1093                         break;
1094                 }
1095         }
1096         SCTP_TCB_UNLOCK(stcb);
1097         if (!fnd) {
1098                 /* No IPv4 address */
1099                 SCTP_FREE_SONAME(sin6);
1100                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1101                 return (ENOENT);
1102         }
1103         if ((error = sa6_recoverscope(sin6)) != 0) {
1104                 SCTP_FREE_SONAME(sin6);
1105                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
1106                 return (error);
1107         }
1108         *addr = (struct sockaddr *)sin6;
1109         return (0);
1110 }
1111
1112 static int
1113 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1114 {
1115         struct in6pcb *inp6 = sotoin6pcb(so);
1116         int error;
1117
1118         if (inp6 == NULL) {
1119                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1120                 return (EINVAL);
1121         }
1122         /* allow v6 addresses precedence */
1123         error = sctp6_getaddr(so, nam);
1124 #ifdef INET
1125         if (error) {
1126                 struct sockaddr_in6 *sin6;
1127
1128                 /* try v4 next if v6 failed */
1129                 error = sctp_ingetaddr(so, nam);
1130                 if (error) {
1131                         return (error);
1132                 }
1133                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1134                 if (sin6 == NULL) {
1135                         SCTP_FREE_SONAME(*nam);
1136                         return (ENOMEM);
1137                 }
1138                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1139                 SCTP_FREE_SONAME(*nam);
1140                 *nam = (struct sockaddr *)sin6;
1141         }
1142 #endif
1143         return (error);
1144 }
1145
1146
1147 static int
1148 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1149 {
1150         struct in6pcb *inp6 = sotoin6pcb(so);
1151         int error;
1152
1153         if (inp6 == NULL) {
1154                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1155                 return (EINVAL);
1156         }
1157         /* allow v6 addresses precedence */
1158         error = sctp6_peeraddr(so, nam);
1159 #ifdef INET
1160         if (error) {
1161                 struct sockaddr_in6 *sin6;
1162
1163                 /* try v4 next if v6 failed */
1164                 error = sctp_peeraddr(so, nam);
1165                 if (error) {
1166                         return (error);
1167                 }
1168                 SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1169                 if (sin6 == NULL) {
1170                         SCTP_FREE_SONAME(*nam);
1171                         return (ENOMEM);
1172                 }
1173                 in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
1174                 SCTP_FREE_SONAME(*nam);
1175                 *nam = (struct sockaddr *)sin6;
1176         }
1177 #endif
1178         return (error);
1179 }
1180
1181 struct pr_usrreqs sctp6_usrreqs = {
1182         .pru_abort = sctp6_abort,
1183         .pru_accept = sctp_accept,
1184         .pru_attach = sctp6_attach,
1185         .pru_bind = sctp6_bind,
1186         .pru_connect = sctp6_connect,
1187         .pru_control = in6_control,
1188         .pru_close = sctp6_close,
1189         .pru_detach = sctp6_close,
1190         .pru_sopoll = sopoll_generic,
1191         .pru_flush = sctp_flush,
1192         .pru_disconnect = sctp6_disconnect,
1193         .pru_listen = sctp_listen,
1194         .pru_peeraddr = sctp6_getpeeraddr,
1195         .pru_send = sctp6_send,
1196         .pru_shutdown = sctp_shutdown,
1197         .pru_sockaddr = sctp6_in6getaddr,
1198         .pru_sosend = sctp_sosend,
1199         .pru_soreceive = sctp_soreceive
1200 };
1201
1202 #endif