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 #ifdef INET6
  43 #include <netinet6/sctp6_var.h>
  44 #endif
  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/udp.h>
  58
  59 #ifdef IPSEC
  60 #include <netipsec/ipsec.h>
  61 #ifdef INET6
  62 #include <netipsec/ipsec6.h>
  63 #endif                          /* INET6 */
  64 #endif                          /* IPSEC */
  65
  66 extern struct protosw inetsw[];
  67
  68 int
  69 sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
  70 {
  71         struct mbuf *m;
  72         int iphlen;
  73         uint32_t vrf_id;
  74         uint8_t ecn_bits;
  75         struct sockaddr_in6 src, dst;
  76         struct ip6_hdr *ip6;
  77         struct sctphdr *sh;
  78         struct sctp_chunkhdr *ch;
  79         int length, offset;
  80
  81 #if !defined(SCTP_WITH_NO_CSUM)
  82         uint8_t compute_crc;
  83
  84 #endif
  85         uint32_t mflowid;
  86         uint8_t use_mflowid;
  87
  88         iphlen = *offp;
  89         if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
  90                 SCTP_RELEASE_PKT(*i_pak);
  91                 return (IPPROTO_DONE);
  92         }
  93         m = SCTP_HEADER_TO_CHAIN(*i_pak);
  94 #ifdef SCTP_MBUF_LOGGING
  95         /* Log in any input mbufs */
  96         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
  97                 struct mbuf *mat;
  98
  99                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
 100                         if (SCTP_BUF_IS_EXTENDED(mat)) {
 101                                 sctp_log_mb(mat, SCTP_MBUF_INPUT);
 102                         }
 103                 }
 104         }
 105 #endif
 106 #ifdef SCTP_PACKET_LOGGING
 107         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
 108                 sctp_packet_log(m);
 109         }
 110 #endif
 111         SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
 112             "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
 113             m->m_pkthdr.len,
 114             if_name(m->m_pkthdr.rcvif),
 115             m->m_pkthdr.csum_flags);
 116         if (m->m_flags & M_FLOWID) {
 117                 mflowid = m->m_pkthdr.flowid;
 118                 use_mflowid = 1;
 119         } else {
 120                 mflowid = 0;
 121                 use_mflowid = 0;
 122         }
 123         SCTP_STAT_INCR(sctps_recvpackets);
 124         SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
 125         /* Get IP, SCTP, and first chunk header together in the first mbuf. */
 126         offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 127         ip6 = mtod(m, struct ip6_hdr *);
 128         IP6_EXTHDR_GET(sh, struct sctphdr *, m, iphlen,
 129             (int)(sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)));
 130         if (sh == NULL) {
 131                 SCTP_STAT_INCR(sctps_hdrops);
 132                 return (IPPROTO_DONE);
 133         }
 134         ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
 135         offset -= sizeof(struct sctp_chunkhdr);
 136         memset(&src, 0, sizeof(struct sockaddr_in6));
 137         src.sin6_family = AF_INET6;
 138         src.sin6_len = sizeof(struct sockaddr_in6);
 139         src.sin6_port = sh->src_port;
 140         src.sin6_addr = ip6->ip6_src;
 141         if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 142                 goto out;
 143         }
 144         memset(&dst, 0, sizeof(struct sockaddr_in6));
 145         dst.sin6_family = AF_INET6;
 146         dst.sin6_len = sizeof(struct sockaddr_in6);
 147         dst.sin6_port = sh->dest_port;
 148         dst.sin6_addr = ip6->ip6_dst;
 149         if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
 150                 goto out;
 151         }
 152         if (faithprefix_p != NULL && (*faithprefix_p) (&dst.sin6_addr)) {
 153                 /* XXX send icmp6 host/port unreach? */
 154                 goto out;
 155         }
 156         length = ntohs(ip6->ip6_plen) + iphlen;
 157         /* Validate mbuf chain length with IP payload length. */
 158         if (SCTP_HEADER_LEN(m) != length) {
 159                 SCTPDBG(SCTP_DEBUG_INPUT1,
 160                     "sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
 161                 SCTP_STAT_INCR(sctps_hdrops);
 162                 goto out;
 163         }
 164         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 165                 goto out;
 166         }
 167         ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
 168 #if defined(SCTP_WITH_NO_CSUM)
 169         SCTP_STAT_INCR(sctps_recvnocrc);
 170 #else
 171         if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
 172                 SCTP_STAT_INCR(sctps_recvhwcrc);
 173                 compute_crc = 0;
 174         } else {
 175                 SCTP_STAT_INCR(sctps_recvswcrc);
 176                 compute_crc = 1;
 177         }
 178 #endif
 179         sctp_common_input_processing(&m, iphlen, offset, length,
 180             (struct sockaddr *)&src,
 181             (struct sockaddr *)&dst,
 182             sh, ch,
 183 #if !defined(SCTP_WITH_NO_CSUM)
 184             compute_crc,
 185 #endif
 186             ecn_bits,
 187             use_mflowid, mflowid,
 188             vrf_id, port);
 189 out:
 190         if (m) {
 191                 sctp_m_freem(m);
 192         }
 193         return (IPPROTO_DONE);
 194 }
 195
 196
 197 int
 198 sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
 199 {
 200         return (sctp6_input_with_port(i_pak, offp, 0));
 201 }
 202
 203 static void
 204 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 205     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 206 {
 207         uint32_t nxtsz;
 208
 209         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 210             (icmp6 == NULL) || (sh == NULL)) {
 211                 goto out;
 212         }
 213         /* First do we even look at it? */
 214         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 215                 goto out;
 216
 217         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 218                 /* not PACKET TO BIG */
 219                 goto out;
 220         }
 221         /*
 222          * ok we need to look closely. We could even get smarter and look at
 223          * anyone that we sent to in case we get a different ICMP that tells
 224          * us there is no way to reach a host, but for this impl, all we
 225          * care about is MTU discovery.
 226          */
 227         nxtsz = ntohl(icmp6->icmp6_mtu);
 228         /* Stop any PMTU timer */
 229         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 230
 231         /* Adjust destination size limit */
 232         if (net->mtu > nxtsz) {
 233                 net->mtu = nxtsz;
 234                 if (net->port) {
 235                         net->mtu -= sizeof(struct udphdr);
 236                 }
 237         }
 238         /* now what about the ep? */
 239         if (stcb->asoc.smallest_mtu > nxtsz) {
 240                 struct sctp_tmit_chunk *chk;
 241
 242                 /* Adjust that too */
 243                 stcb->asoc.smallest_mtu = nxtsz;
 244                 /* now off to subtract IP_DF flag if needed */
 245
 246                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 247                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 248                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 249                         }
 250                 }
 251                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 252                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 253                                 /*
 254                                  * For this guy we also mark for immediate
 255                                  * resend since we sent to big of chunk
 256                                  */
 257                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 258                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 259                                         stcb->asoc.sent_queue_retran_cnt++;
 260                                 chk->sent = SCTP_DATAGRAM_RESEND;
 261                                 chk->rec.data.doing_fast_retransmit = 0;
 262
 263                                 chk->sent = SCTP_DATAGRAM_RESEND;
 264                                 /* Clear any time so NO RTT is being done */
 265                                 chk->sent_rcv_time.tv_sec = 0;
 266                                 chk->sent_rcv_time.tv_usec = 0;
 267                                 stcb->asoc.total_flight -= chk->send_size;
 268                                 net->flight_size -= chk->send_size;
 269                         }
 270                 }
 271         }
 272         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 273 out:
 274         if (stcb) {
 275                 SCTP_TCB_UNLOCK(stcb);
 276         }
 277 }
 278
 279
 280 void
 281 sctp6_notify(struct sctp_inpcb *inp,
 282     struct icmp6_hdr *icmph,
 283     struct sctphdr *sh,
 284     struct sockaddr *to,
 285     struct sctp_tcb *stcb,
 286     struct sctp_nets *net)
 287 {
 288 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 289         struct socket *so;
 290
 291 #endif
 292
 293         /* protection */
 294         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 295             (sh == NULL) || (to == NULL)) {
 296                 if (stcb)
 297                         SCTP_TCB_UNLOCK(stcb);
 298                 return;
 299         }
 300         /* First job is to verify the vtag matches what I would send */
 301         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 302                 SCTP_TCB_UNLOCK(stcb);
 303                 return;
 304         }
 305         if (icmph->icmp6_type != ICMP_UNREACH) {
 306                 /* We only care about unreachable */
 307                 SCTP_TCB_UNLOCK(stcb);
 308                 return;
 309         }
 310         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 311             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 312             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 313             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 314             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 315             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 316             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 317             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 318
 319                 /*
 320                  * Hmm reachablity problems we must examine closely. If its
 321                  * not reachable, we may have lost a network. Or if there is
 322                  * NO protocol at the other end named SCTP. well we consider
 323                  * it a OOTB abort.
 324                  */
 325                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 326                         /* Ok that destination is NOT reachable */
 327                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 328                         net->dest_state &= ~SCTP_ADDR_PF;
 329                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 330                             stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 331                 }
 332                 SCTP_TCB_UNLOCK(stcb);
 333         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 334             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 335                 /*
 336                  * Here the peer is either playing tricks on us, including
 337                  * an address that belongs to someone who does not support
 338                  * SCTP OR was a userland implementation that shutdown and
 339                  * now is dead. In either case treat it like a OOTB abort
 340                  * with no TCB
 341                  */
 342                 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 343 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 344                 so = SCTP_INP_SO(inp);
 345                 atomic_add_int(&stcb->asoc.refcnt, 1);
 346                 SCTP_TCB_UNLOCK(stcb);
 347                 SCTP_SOCKET_LOCK(so, 1);
 348                 SCTP_TCB_LOCK(stcb);
 349                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 350 #endif
 351                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 352 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 353                 SCTP_SOCKET_UNLOCK(so, 1);
 354                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 355 #endif
 356                 /* no need to unlock here, since the TCB is gone */
 357         } else {
 358                 SCTP_TCB_UNLOCK(stcb);
 359         }
 360 }
 361
 362
 363
 364 void
 365 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 366 {
 367         struct sctphdr sh;
 368         struct ip6ctlparam *ip6cp = NULL;
 369         uint32_t vrf_id;
 370
 371         vrf_id = SCTP_DEFAULT_VRFID;
 372
 373         if (pktdst->sa_family != AF_INET6 ||
 374             pktdst->sa_len != sizeof(struct sockaddr_in6))
 375                 return;
 376
 377         if ((unsigned)cmd >= PRC_NCMDS)
 378                 return;
 379         if (PRC_IS_REDIRECT(cmd)) {
 380                 d = NULL;
 381         } else if (inet6ctlerrmap[cmd] == 0) {
 382                 return;
 383         }
 384         /* if the parameter is from icmp6, decode it. */
 385         if (d != NULL) {
 386                 ip6cp = (struct ip6ctlparam *)d;
 387         } else {
 388                 ip6cp = (struct ip6ctlparam *)NULL;
 389         }
 390
 391         if (ip6cp) {
 392                 /*
 393                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 394                  * valid.
 395                  */
 396                 struct sctp_inpcb *inp = NULL;
 397                 struct sctp_tcb *stcb = NULL;
 398                 struct sctp_nets *net = NULL;
 399                 struct sockaddr_in6 final;
 400
 401                 if (ip6cp->ip6c_m == NULL)
 402                         return;
 403
 404                 /* Check if we can safely examine the SCTP header. */
 405                 if (ip6cp->ip6c_m->m_pkthdr.len < ip6cp->ip6c_off + sizeof(sh))
 406                         return;
 407
 408                 bzero(&sh, sizeof(sh));
 409                 bzero(&final, sizeof(final));
 410                 inp = NULL;
 411                 net = NULL;
 412                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 413                     (caddr_t)&sh);
 414                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 415                 final.sin6_len = sizeof(final);
 416                 final.sin6_family = AF_INET6;
 417                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 418                 final.sin6_port = sh.dest_port;
 419                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&final,
 420                     (struct sockaddr *)ip6cp->ip6c_src,
 421                     &inp, &net, 1, vrf_id);
 422                 /* inp's ref-count increased && stcb locked */
 423                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 424                         if (cmd == PRC_MSGSIZE) {
 425                                 sctp6_notify_mbuf(inp,
 426                                     ip6cp->ip6c_icmp6,
 427                                     &sh,
 428                                     stcb,
 429                                     net);
 430                                 /* inp's ref-count reduced && stcb unlocked */
 431                         } else {
 432                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 433                                     (struct sockaddr *)&final,
 434                                     stcb, net);
 435                                 /* inp's ref-count reduced && stcb unlocked */
 436                         }
 437                 } else {
 438                         if (PRC_IS_REDIRECT(cmd) && inp) {
 439                                 in6_rtchange((struct in6pcb *)inp,
 440                                     inet6ctlerrmap[cmd]);
 441                         }
 442                         if (inp) {
 443                                 /* reduce inp's ref-count */
 444                                 SCTP_INP_WLOCK(inp);
 445                                 SCTP_INP_DECR_REF(inp);
 446                                 SCTP_INP_WUNLOCK(inp);
 447                         }
 448                         if (stcb)
 449                                 SCTP_TCB_UNLOCK(stcb);
 450                 }
 451         }
 452 }
 453
 454 /*
 455  * this routine can probably be collasped into the one in sctp_userreq.c
 456  * since they do the same thing and now we lookup with a sockaddr
 457  */
 458 static int
 459 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 460 {
 461         struct xucred xuc;
 462         struct sockaddr_in6 addrs[2];
 463         struct sctp_inpcb *inp;
 464         struct sctp_nets *net;
 465         struct sctp_tcb *stcb;
 466         int error;
 467         uint32_t vrf_id;
 468
 469         vrf_id = SCTP_DEFAULT_VRFID;
 470
 471         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 472         if (error)
 473                 return (error);
 474
 475         if (req->newlen != sizeof(addrs)) {
 476                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 477                 return (EINVAL);
 478         }
 479         if (req->oldlen != sizeof(struct ucred)) {
 480                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 481                 return (EINVAL);
 482         }
 483         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 484         if (error)
 485                 return (error);
 486
 487         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 488             sin6tosa(&addrs[0]),
 489             &inp, &net, 1, vrf_id);
 490         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 491                 if ((inp != NULL) && (stcb == NULL)) {
 492                         /* reduce ref-count */
 493                         SCTP_INP_WLOCK(inp);
 494                         SCTP_INP_DECR_REF(inp);
 495                         goto cred_can_cont;
 496                 }
 497                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 498                 error = ENOENT;
 499                 goto out;
 500         }
 501         SCTP_TCB_UNLOCK(stcb);
 502         /*
 503          * We use the write lock here, only since in the error leg we need
 504          * it. If we used RLOCK, then we would have to
 505          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 506          * Better to use higher wlock.
 507          */
 508         SCTP_INP_WLOCK(inp);
 509 cred_can_cont:
 510         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 511         if (error) {
 512                 SCTP_INP_WUNLOCK(inp);
 513                 goto out;
 514         }
 515         cru2x(inp->sctp_socket->so_cred, &xuc);
 516         SCTP_INP_WUNLOCK(inp);
 517         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 518 out:
 519         return (error);
 520 }
 521
 522 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 523     0, 0,
 524     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 525
 526
 527 /* This is the same as the sctp_abort() could be made common */
 528 static void
 529 sctp6_abort(struct socket *so)
 530 {
 531         struct sctp_inpcb *inp;
 532         uint32_t flags;
 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;
 538         }
 539 sctp_must_try_again:
 540         flags = inp->sctp_flags;
 541 #ifdef SCTP_LOG_CLOSING
 542         sctp_log_closing(inp, NULL, 17);
 543 #endif
 544         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 545             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 546 #ifdef SCTP_LOG_CLOSING
 547                 sctp_log_closing(inp, NULL, 16);
 548 #endif
 549                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 550                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 551                 SOCK_LOCK(so);
 552                 SCTP_SB_CLEAR(so->so_snd);
 553                 /*
 554                  * same for the rcv ones, they are only here for the
 555                  * accounting/select.
 556                  */
 557                 SCTP_SB_CLEAR(so->so_rcv);
 558                 /* Now null out the reference, we are completely detached. */
 559                 so->so_pcb = NULL;
 560                 SOCK_UNLOCK(so);
 561         } else {
 562                 flags = inp->sctp_flags;
 563                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 564                         goto sctp_must_try_again;
 565                 }
 566         }
 567         return;
 568 }
 569
 570 static int
 571 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 572 {
 573         struct in6pcb *inp6;
 574         int error;
 575         struct sctp_inpcb *inp;
 576         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 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 (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 584                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 585                 if (error)
 586                         return (error);
 587         }
 588         error = sctp_inpcb_alloc(so, vrf_id);
 589         if (error)
 590                 return (error);
 591         inp = (struct sctp_inpcb *)so->so_pcb;
 592         SCTP_INP_WLOCK(inp);
 593         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 594         inp6 = (struct in6pcb *)inp;
 595
 596         inp6->inp_vflag |= INP_IPV6;
 597         inp6->in6p_hops = -1;   /* use kernel default */
 598         inp6->in6p_cksum = -1;  /* just to be sure */
 599 #ifdef INET
 600         /*
 601          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 602          * socket as well, because the socket may be bound to an IPv6
 603          * wildcard address, which may match an IPv4-mapped IPv6 address.
 604          */
 605         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 606 #endif
 607         /*
 608          * Hmm what about the IPSEC stuff that is missing here but in
 609          * sctp_attach()?
 610          */
 611         SCTP_INP_WUNLOCK(inp);
 612         return (0);
 613 }
 614
 615 static int
 616 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 617 {
 618         struct sctp_inpcb *inp;
 619         struct in6pcb *inp6;
 620         int error;
 621
 622         inp = (struct sctp_inpcb *)so->so_pcb;
 623         if (inp == NULL) {
 624                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 625                 return (EINVAL);
 626         }
 627         if (addr) {
 628                 switch (addr->sa_family) {
 629 #ifdef INET
 630                 case AF_INET:
 631                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 632                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 633                                 return (EINVAL);
 634                         }
 635                         break;
 636 #endif
 637 #ifdef INET6
 638                 case AF_INET6:
 639                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 640                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 641                                 return (EINVAL);
 642                         }
 643                         break;
 644 #endif
 645                 default:
 646                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 647                         return (EINVAL);
 648                 }
 649         }
 650         inp6 = (struct in6pcb *)inp;
 651         inp6->inp_vflag &= ~INP_IPV4;
 652         inp6->inp_vflag |= INP_IPV6;
 653         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 654                 switch (addr->sa_family) {
 655 #ifdef INET
 656                 case AF_INET:
 657                         /* binding v4 addr to v6 socket, so reset flags */
 658                         inp6->inp_vflag |= INP_IPV4;
 659                         inp6->inp_vflag &= ~INP_IPV6;
 660                         break;
 661 #endif
 662 #ifdef INET6
 663                 case AF_INET6:
 664                         {
 665                                 struct sockaddr_in6 *sin6_p;
 666
 667                                 sin6_p = (struct sockaddr_in6 *)addr;
 668
 669                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 670                                         inp6->inp_vflag |= INP_IPV4;
 671                                 }
 672 #ifdef INET
 673                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 674                                         struct sockaddr_in sin;
 675
 676                                         in6_sin6_2_sin(&sin, sin6_p);
 677                                         inp6->inp_vflag |= INP_IPV4;
 678                                         inp6->inp_vflag &= ~INP_IPV6;
 679                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 680                                         return (error);
 681                                 }
 682 #endif
 683                                 break;
 684                         }
 685 #endif
 686                 default:
 687                         break;
 688                 }
 689         } else if (addr != NULL) {
 690                 struct sockaddr_in6 *sin6_p;
 691
 692                 /* IPV6_V6ONLY socket */
 693 #ifdef INET
 694                 if (addr->sa_family == AF_INET) {
 695                         /* can't bind v4 addr to v6 only socket! */
 696                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 697                         return (EINVAL);
 698                 }
 699 #endif
 700                 sin6_p = (struct sockaddr_in6 *)addr;
 701
 702                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 703                         /* can't bind v4-mapped addrs either! */
 704                         /* NOTE: we don't support SIIT */
 705                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 706                         return (EINVAL);
 707                 }
 708         }
 709         error = sctp_inpcb_bind(so, addr, NULL, p);
 710         return (error);
 711 }
 712
 713
 714 static void
 715 sctp6_close(struct socket *so)
 716 {
 717         sctp_close(so);
 718 }
 719
 720 /* This could be made common with sctp_detach() since they are identical */
 721
 722 static
 723 int
 724 sctp6_disconnect(struct socket *so)
 725 {
 726         return (sctp_disconnect(so));
 727 }
 728
 729
 730 int
 731 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 732     struct mbuf *control, struct thread *p);
 733
 734
 735 static int
 736 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 737     struct mbuf *control, struct thread *p)
 738 {
 739         struct sctp_inpcb *inp;
 740         struct in6pcb *inp6;
 741
 742 #ifdef INET
 743         struct sockaddr_in6 *sin6;
 744
 745 #endif                          /* INET */
 746         /* No SPL needed since sctp_output does this */
 747
 748         inp = (struct sctp_inpcb *)so->so_pcb;
 749         if (inp == NULL) {
 750                 if (control) {
 751                         SCTP_RELEASE_PKT(control);
 752                         control = NULL;
 753                 }
 754                 SCTP_RELEASE_PKT(m);
 755                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 756                 return (EINVAL);
 757         }
 758         inp6 = (struct in6pcb *)inp;
 759         /*
 760          * For the TCP model we may get a NULL addr, if we are a connected
 761          * socket thats ok.
 762          */
 763         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 764             (addr == NULL)) {
 765                 goto connected_type;
 766         }
 767         if (addr == NULL) {
 768                 SCTP_RELEASE_PKT(m);
 769                 if (control) {
 770                         SCTP_RELEASE_PKT(control);
 771                         control = NULL;
 772                 }
 773                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 774                 return (EDESTADDRREQ);
 775         }
 776 #ifdef INET
 777         sin6 = (struct sockaddr_in6 *)addr;
 778         if (SCTP_IPV6_V6ONLY(inp6)) {
 779                 /*
 780                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 781                  * v4 addr or v4-mapped addr
 782                  */
 783                 if (addr->sa_family == AF_INET) {
 784                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 785                         return (EINVAL);
 786                 }
 787                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 788                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 789                         return (EINVAL);
 790                 }
 791         }
 792         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 793                 struct sockaddr_in sin;
 794
 795                 /* convert v4-mapped into v4 addr and send */
 796                 in6_sin6_2_sin(&sin, sin6);
 797                 return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
 798         }
 799 #endif                          /* INET */
 800 connected_type:
 801         /* now what about control */
 802         if (control) {
 803                 if (inp->control) {
 804                         SCTP_PRINTF("huh? control set?\n");
 805                         SCTP_RELEASE_PKT(inp->control);
 806                         inp->control = NULL;
 807                 }
 808                 inp->control = control;
 809         }
 810         /* Place the data */
 811         if (inp->pkt) {
 812                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 813                 inp->pkt_last = m;
 814         } else {
 815                 inp->pkt_last = inp->pkt = m;
 816         }
 817         if (
 818         /* FreeBSD and MacOSX uses a flag passed */
 819             ((flags & PRUS_MORETOCOME) == 0)
 820             ) {
 821                 /*
 822                  * note with the current version this code will only be used
 823                  * by OpenBSD, NetBSD and FreeBSD have methods for
 824                  * re-defining sosend() to use sctp_sosend().  One can
 825                  * optionaly switch back to this code (by changing back the
 826                  * defininitions but this is not advisable.
 827                  */
 828                 int ret;
 829
 830                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 831                 inp->pkt = NULL;
 832                 inp->control = NULL;
 833                 return (ret);
 834         } else {
 835                 return (0);
 836         }
 837 }
 838
 839 static int
 840 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 841 {
 842         uint32_t vrf_id;
 843         int error = 0;
 844         struct sctp_inpcb *inp;
 845         struct sctp_tcb *stcb;
 846
 847 #ifdef INET
 848         struct in6pcb *inp6;
 849         struct sockaddr_in6 *sin6;
 850         struct sockaddr_storage ss;
 851
 852 #endif
 853
 854 #ifdef INET
 855         inp6 = (struct in6pcb *)so->so_pcb;
 856 #endif
 857         inp = (struct sctp_inpcb *)so->so_pcb;
 858         if (inp == NULL) {
 859                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 860                 return (ECONNRESET);    /* I made the same as TCP since we are
 861                                          * not setup? */
 862         }
 863         if (addr == NULL) {
 864                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 865                 return (EINVAL);
 866         }
 867         switch (addr->sa_family) {
 868 #ifdef INET
 869         case AF_INET:
 870                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 871                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 872                         return (EINVAL);
 873                 }
 874                 break;
 875 #endif
 876 #ifdef INET6
 877         case AF_INET6:
 878                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 879                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 880                         return (EINVAL);
 881                 }
 882                 break;
 883 #endif
 884         default:
 885                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 886                 return (EINVAL);
 887         }
 888
 889         vrf_id = inp->def_vrf_id;
 890         SCTP_ASOC_CREATE_LOCK(inp);
 891         SCTP_INP_RLOCK(inp);
 892         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 893             SCTP_PCB_FLAGS_UNBOUND) {
 894                 /* Bind a ephemeral port */
 895                 SCTP_INP_RUNLOCK(inp);
 896                 error = sctp6_bind(so, NULL, p);
 897                 if (error) {
 898                         SCTP_ASOC_CREATE_UNLOCK(inp);
 899
 900                         return (error);
 901                 }
 902                 SCTP_INP_RLOCK(inp);
 903         }
 904         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 905             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 906                 /* We are already connected AND the TCP model */
 907                 SCTP_INP_RUNLOCK(inp);
 908                 SCTP_ASOC_CREATE_UNLOCK(inp);
 909                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 910                 return (EADDRINUSE);
 911         }
 912 #ifdef INET
 913         sin6 = (struct sockaddr_in6 *)addr;
 914         if (SCTP_IPV6_V6ONLY(inp6)) {
 915                 /*
 916                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 917                  * addr or v4-mapped addr
 918                  */
 919                 if (addr->sa_family == AF_INET) {
 920                         SCTP_INP_RUNLOCK(inp);
 921                         SCTP_ASOC_CREATE_UNLOCK(inp);
 922                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 923                         return (EINVAL);
 924                 }
 925                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 926                         SCTP_INP_RUNLOCK(inp);
 927                         SCTP_ASOC_CREATE_UNLOCK(inp);
 928                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 929                         return (EINVAL);
 930                 }
 931         }
 932         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 933                 /* convert v4-mapped into v4 addr */
 934                 in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
 935                 addr = (struct sockaddr *)&ss;
 936         }
 937 #endif                          /* INET */
 938         /* Now do we connect? */
 939         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 940                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 941                 if (stcb) {
 942                         SCTP_TCB_UNLOCK(stcb);
 943                 }
 944                 SCTP_INP_RUNLOCK(inp);
 945         } else {
 946                 SCTP_INP_RUNLOCK(inp);
 947                 SCTP_INP_WLOCK(inp);
 948                 SCTP_INP_INCR_REF(inp);
 949                 SCTP_INP_WUNLOCK(inp);
 950                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 951                 if (stcb == NULL) {
 952                         SCTP_INP_WLOCK(inp);
 953                         SCTP_INP_DECR_REF(inp);
 954                         SCTP_INP_WUNLOCK(inp);
 955                 }
 956         }
 957
 958         if (stcb != NULL) {
 959                 /* Already have or am bring up an association */
 960                 SCTP_ASOC_CREATE_UNLOCK(inp);
 961                 SCTP_TCB_UNLOCK(stcb);
 962                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 963                 return (EALREADY);
 964         }
 965         /* We are GOOD to go */
 966         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
 967         SCTP_ASOC_CREATE_UNLOCK(inp);
 968         if (stcb == NULL) {
 969                 /* Gak! no memory */
 970                 return (error);
 971         }
 972         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 973                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 974                 /* Set the connected flag so we can queue data */
 975                 soisconnecting(so);
 976         }
 977         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
 978         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 979
 980         /* initialize authentication parameters for the assoc */
 981         sctp_initialize_auth_params(inp, stcb);
 982
 983         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 984         SCTP_TCB_UNLOCK(stcb);
 985         return (error);
 986 }
 987
 988 static int
 989 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 990 {
 991         struct sockaddr_in6 *sin6;
 992         struct sctp_inpcb *inp;
 993         uint32_t vrf_id;
 994         struct sctp_ifa *sctp_ifa;
 995
 996         int error;
 997
 998         /*
 999          * Do the malloc first in case it blocks.
1000          */
1001         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
1002         if (sin6 == NULL)
1003                 return (ENOMEM);
1004         sin6->sin6_family = AF_INET6;
1005         sin6->sin6_len = sizeof(*sin6);
1006
1007         inp = (struct sctp_inpcb *)so->so_pcb;
1008         if (inp == NULL) {
1009                 SCTP_FREE_SONAME(sin6);
1010                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1011                 return (ECONNRESET);
1012         }
1013         SCTP_INP_RLOCK(inp);
1014         sin6->sin6_port = inp->sctp_lport;
1015         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1016                 /* For the bound all case you get back 0 */
1017                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1018                         struct sctp_tcb *stcb;
1019                         struct sockaddr_in6 *sin_a6;
1020                         struct sctp_nets *net;
1021                         int fnd;
1022
1023                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1024                         if (stcb == NULL) {
1025                                 goto notConn6;
1026                         }
1027                         fnd = 0;
1028                         sin_a6 = NULL;
1029                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1030                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1031                                 if (sin_a6 == NULL)
1032                                         /* this will make coverity happy */
1033                                         continue;
1034
1035                                 if (sin_a6->sin6_family == AF_INET6) {
1036                                         fnd = 1;
1037                                         break;
1038                                 }
1039                         }
1040                         if ((!fnd) || (sin_a6 == NULL)) {
1041                                 /* punt */
1042                                 goto notConn6;
1043                         }
1044                         vrf_id = inp->def_vrf_id;
1045                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1046                         if (sctp_ifa) {
1047                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1048                         }
1049                 } else {
1050                         /* For the bound all case you get back 0 */
1051         notConn6:
1052                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1053                 }
1054         } else {
1055                 /* Take the first IPv6 address in the list */
1056                 struct sctp_laddr *laddr;
1057                 int fnd = 0;
1058
1059                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1060                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1061                                 struct sockaddr_in6 *sin_a;
1062
1063                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1064                                 sin6->sin6_addr = sin_a->sin6_addr;
1065                                 fnd = 1;
1066                                 break;
1067                         }
1068                 }
1069                 if (!fnd) {
1070                         SCTP_FREE_SONAME(sin6);
1071                         SCTP_INP_RUNLOCK(inp);
1072                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1073                         return (ENOENT);
1074                 }
1075         }
1076         SCTP_INP_RUNLOCK(inp);
1077         /* Scoping things for v6 */
1078         if ((error = sa6_recoverscope(sin6)) != 0) {
1079                 SCTP_FREE_SONAME(sin6);
1080                 return (error);
1081         }
1082         (*addr) = (struct sockaddr *)sin6;
1083         return (0);
1084 }
1085
1086 static int
1087 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1088 {
1089         struct sockaddr_in6 *sin6;
1090         int fnd;
1091         struct sockaddr_in6 *sin_a6;
1092         struct sctp_inpcb *inp;
1093         struct sctp_tcb *stcb;
1094         struct sctp_nets *net;
1095         int error;
1096
1097         /* Do the malloc first in case it blocks. */
1098         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1099         if (sin6 == NULL)
1100                 return (ENOMEM);
1101         sin6->sin6_family = AF_INET6;
1102         sin6->sin6_len = sizeof(*sin6);
1103
1104         inp = (struct sctp_inpcb *)so->so_pcb;
1105         if ((inp == NULL) ||
1106             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1107                 /* UDP type and listeners will drop out here */
1108                 SCTP_FREE_SONAME(sin6);
1109                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1110                 return (ENOTCONN);
1111         }
1112         SCTP_INP_RLOCK(inp);
1113         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1114         if (stcb) {
1115                 SCTP_TCB_LOCK(stcb);
1116         }
1117         SCTP_INP_RUNLOCK(inp);
1118         if (stcb == NULL) {
1119                 SCTP_FREE_SONAME(sin6);
1120                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1121                 return (ECONNRESET);
1122         }
1123         fnd = 0;
1124         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1125                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1126                 if (sin_a6->sin6_family == AF_INET6) {
1127                         fnd = 1;
1128                         sin6->sin6_port = stcb->rport;
1129                         sin6->sin6_addr = sin_a6->sin6_addr;
1130                         break;
1131                 }
1132         }
1133         SCTP_TCB_UNLOCK(stcb);
1134         if (!fnd) {
1135                 /* No IPv4 address */
1136                 SCTP_FREE_SONAME(sin6);
1137                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1138                 return (ENOENT);
1139         }
1140         if ((error = sa6_recoverscope(sin6)) != 0)
1141                 return (error);
1142         *addr = (struct sockaddr *)sin6;
1143         return (0);
1144 }
1145
1146 static int
1147 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1148 {
1149 #ifdef INET
1150         struct sockaddr *addr;
1151
1152 #endif
1153         struct in6pcb *inp6 = sotoin6pcb(so);
1154         int error;
1155
1156         if (inp6 == NULL) {
1157                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1158                 return (EINVAL);
1159         }
1160         /* allow v6 addresses precedence */
1161         error = sctp6_getaddr(so, nam);
1162 #ifdef INET
1163         if (error) {
1164                 /* try v4 next if v6 failed */
1165                 error = sctp_ingetaddr(so, nam);
1166                 if (error) {
1167                         return (error);
1168                 }
1169                 addr = *nam;
1170                 /* if I'm V6ONLY, convert it to v4-mapped */
1171                 if (SCTP_IPV6_V6ONLY(inp6)) {
1172                         struct sockaddr_in6 sin6;
1173
1174                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1175                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1176                 }
1177         }
1178 #endif
1179         return (error);
1180 }
1181
1182
1183 static int
1184 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1185 {
1186 #ifdef INET
1187         struct sockaddr *addr;
1188
1189 #endif
1190         struct in6pcb *inp6 = sotoin6pcb(so);
1191         int error;
1192
1193         if (inp6 == NULL) {
1194                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1195                 return (EINVAL);
1196         }
1197         /* allow v6 addresses precedence */
1198         error = sctp6_peeraddr(so, nam);
1199 #ifdef INET
1200         if (error) {
1201                 /* try v4 next if v6 failed */
1202                 error = sctp_peeraddr(so, nam);
1203                 if (error) {
1204                         return (error);
1205                 }
1206                 addr = *nam;
1207                 /* if I'm V6ONLY, convert it to v4-mapped */
1208                 if (SCTP_IPV6_V6ONLY(inp6)) {
1209                         struct sockaddr_in6 sin6;
1210
1211                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1212                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1213                 }
1214         }
1215 #endif
1216         return (error);
1217 }
1218
1219 struct pr_usrreqs sctp6_usrreqs = {
1220         .pru_abort = sctp6_abort,
1221         .pru_accept = sctp_accept,
1222         .pru_attach = sctp6_attach,
1223         .pru_bind = sctp6_bind,
1224         .pru_connect = sctp6_connect,
1225         .pru_control = in6_control,
1226         .pru_close = sctp6_close,
1227         .pru_detach = sctp6_close,
1228         .pru_sopoll = sopoll_generic,
1229         .pru_flush = sctp_flush,
1230         .pru_disconnect = sctp6_disconnect,
1231         .pru_listen = sctp_listen,
1232         .pru_peeraddr = sctp6_getpeeraddr,
1233         .pru_send = sctp6_send,
1234         .pru_shutdown = sctp_shutdown,
1235         .pru_sockaddr = sctp6_in6getaddr,
1236         .pru_sosend = sctp_sosend,
1237         .pru_soreceive = sctp_soreceive
1238 };
1239
1240 #endif