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 #include <sys/proc.h>
  38 #include <netinet/sctp_pcb.h>
  39 #include <netinet/sctp_header.h>
  40 #include <netinet/sctp_var.h>
  41 #ifdef INET6
  42 #include <netinet6/sctp6_var.h>
  43 #endif
  44 #include <netinet/sctp_sysctl.h>
  45 #include <netinet/sctp_output.h>
  46 #include <netinet/sctp_uio.h>
  47 #include <netinet/sctp_asconf.h>
  48 #include <netinet/sctputil.h>
  49 #include <netinet/sctp_indata.h>
  50 #include <netinet/sctp_timer.h>
  51 #include <netinet/sctp_auth.h>
  52 #include <netinet/sctp_input.h>
  53 #include <netinet/sctp_output.h>
  54 #include <netinet/sctp_bsd_addr.h>
  55 #include <netinet/sctp_crc32.h>
  56 #include <netinet/udp.h>
  57
  58 #ifdef IPSEC
  59 #include <netipsec/ipsec.h>
  60 #ifdef INET6
  61 #include <netipsec/ipsec6.h>
  62 #endif                          /* INET6 */
  63 #endif                          /* IPSEC */
  64
  65 extern struct protosw inetsw[];
  66
  67 int
  68 sctp6_input(struct mbuf **i_pak, int *offp, int proto)
  69 {
  70         struct mbuf *m;
  71         int iphlen;
  72         uint32_t vrf_id;
  73         uint8_t ecn_bits;
  74         struct sockaddr_in6 src, dst;
  75         struct ip6_hdr *ip6;
  76         struct sctphdr *sh;
  77         struct sctp_chunkhdr *ch;
  78         int length, offset;
  79
  80 #if !defined(SCTP_WITH_NO_CSUM)
  81         uint8_t compute_crc;
  82
  83 #endif
  84         uint32_t mflowid;
  85         uint8_t use_mflowid;
  86         uint16_t port = 0;
  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 static void
 198 sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
 199     struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
 200 {
 201         uint32_t nxtsz;
 202
 203         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 204             (icmp6 == NULL) || (sh == NULL)) {
 205                 goto out;
 206         }
 207         /* First do we even look at it? */
 208         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
 209                 goto out;
 210
 211         if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
 212                 /* not PACKET TO BIG */
 213                 goto out;
 214         }
 215         /*
 216          * ok we need to look closely. We could even get smarter and look at
 217          * anyone that we sent to in case we get a different ICMP that tells
 218          * us there is no way to reach a host, but for this impl, all we
 219          * care about is MTU discovery.
 220          */
 221         nxtsz = ntohl(icmp6->icmp6_mtu);
 222         /* Stop any PMTU timer */
 223         sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
 224
 225         /* Adjust destination size limit */
 226         if (net->mtu > nxtsz) {
 227                 net->mtu = nxtsz;
 228                 if (net->port) {
 229                         net->mtu -= sizeof(struct udphdr);
 230                 }
 231         }
 232         /* now what about the ep? */
 233         if (stcb->asoc.smallest_mtu > nxtsz) {
 234                 struct sctp_tmit_chunk *chk;
 235
 236                 /* Adjust that too */
 237                 stcb->asoc.smallest_mtu = nxtsz;
 238                 /* now off to subtract IP_DF flag if needed */
 239
 240                 TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
 241                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 242                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 243                         }
 244                 }
 245                 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
 246                         if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
 247                                 /*
 248                                  * For this guy we also mark for immediate
 249                                  * resend since we sent to big of chunk
 250                                  */
 251                                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 252                                 if (chk->sent != SCTP_DATAGRAM_RESEND)
 253                                         stcb->asoc.sent_queue_retran_cnt++;
 254                                 chk->sent = SCTP_DATAGRAM_RESEND;
 255                                 chk->rec.data.doing_fast_retransmit = 0;
 256
 257                                 chk->sent = SCTP_DATAGRAM_RESEND;
 258                                 /* Clear any time so NO RTT is being done */
 259                                 chk->sent_rcv_time.tv_sec = 0;
 260                                 chk->sent_rcv_time.tv_usec = 0;
 261                                 stcb->asoc.total_flight -= chk->send_size;
 262                                 net->flight_size -= chk->send_size;
 263                         }
 264                 }
 265         }
 266         sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
 267 out:
 268         if (stcb) {
 269                 SCTP_TCB_UNLOCK(stcb);
 270         }
 271 }
 272
 273
 274 void
 275 sctp6_notify(struct sctp_inpcb *inp,
 276     struct icmp6_hdr *icmph,
 277     struct sctphdr *sh,
 278     struct sockaddr *to,
 279     struct sctp_tcb *stcb,
 280     struct sctp_nets *net)
 281 {
 282 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 283         struct socket *so;
 284
 285 #endif
 286
 287         /* protection */
 288         if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
 289             (sh == NULL) || (to == NULL)) {
 290                 if (stcb)
 291                         SCTP_TCB_UNLOCK(stcb);
 292                 return;
 293         }
 294         /* First job is to verify the vtag matches what I would send */
 295         if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
 296                 SCTP_TCB_UNLOCK(stcb);
 297                 return;
 298         }
 299         if (icmph->icmp6_type != ICMP_UNREACH) {
 300                 /* We only care about unreachable */
 301                 SCTP_TCB_UNLOCK(stcb);
 302                 return;
 303         }
 304         if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
 305             (icmph->icmp6_code == ICMP_UNREACH_HOST) ||
 306             (icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
 307             (icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
 308             (icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
 309             (icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
 310             (icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
 311             (icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
 312
 313                 /*
 314                  * Hmm reachablity problems we must examine closely. If its
 315                  * not reachable, we may have lost a network. Or if there is
 316                  * NO protocol at the other end named SCTP. well we consider
 317                  * it a OOTB abort.
 318                  */
 319                 if (net->dest_state & SCTP_ADDR_REACHABLE) {
 320                         /* Ok that destination is NOT reachable */
 321                         net->dest_state &= ~SCTP_ADDR_REACHABLE;
 322                         net->dest_state &= ~SCTP_ADDR_PF;
 323                         sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 324                             stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
 325                 }
 326                 SCTP_TCB_UNLOCK(stcb);
 327         } else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
 328             (icmph->icmp6_code == ICMP_UNREACH_PORT)) {
 329                 /*
 330                  * Here the peer is either playing tricks on us, including
 331                  * an address that belongs to someone who does not support
 332                  * SCTP OR was a userland implementation that shutdown and
 333                  * now is dead. In either case treat it like a OOTB abort
 334                  * with no TCB
 335                  */
 336                 sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
 337 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 338                 so = SCTP_INP_SO(inp);
 339                 atomic_add_int(&stcb->asoc.refcnt, 1);
 340                 SCTP_TCB_UNLOCK(stcb);
 341                 SCTP_SOCKET_LOCK(so, 1);
 342                 SCTP_TCB_LOCK(stcb);
 343                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 344 #endif
 345                 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
 346 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 347                 SCTP_SOCKET_UNLOCK(so, 1);
 348                 /* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
 349 #endif
 350                 /* no need to unlock here, since the TCB is gone */
 351         } else {
 352                 SCTP_TCB_UNLOCK(stcb);
 353         }
 354 }
 355
 356
 357
 358 void
 359 sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
 360 {
 361         struct sctphdr sh;
 362         struct ip6ctlparam *ip6cp = NULL;
 363         uint32_t vrf_id;
 364
 365         vrf_id = SCTP_DEFAULT_VRFID;
 366
 367         if (pktdst->sa_family != AF_INET6 ||
 368             pktdst->sa_len != sizeof(struct sockaddr_in6))
 369                 return;
 370
 371         if ((unsigned)cmd >= PRC_NCMDS)
 372                 return;
 373         if (PRC_IS_REDIRECT(cmd)) {
 374                 d = NULL;
 375         } else if (inet6ctlerrmap[cmd] == 0) {
 376                 return;
 377         }
 378         /* if the parameter is from icmp6, decode it. */
 379         if (d != NULL) {
 380                 ip6cp = (struct ip6ctlparam *)d;
 381         } else {
 382                 ip6cp = (struct ip6ctlparam *)NULL;
 383         }
 384
 385         if (ip6cp) {
 386                 /*
 387                  * XXX: We assume that when IPV6 is non NULL, M and OFF are
 388                  * valid.
 389                  */
 390                 /* check if we can safely examine src and dst ports */
 391                 struct sctp_inpcb *inp = NULL;
 392                 struct sctp_tcb *stcb = NULL;
 393                 struct sctp_nets *net = NULL;
 394                 struct sockaddr_in6 final;
 395
 396                 if (ip6cp->ip6c_m == NULL)
 397                         return;
 398
 399                 bzero(&sh, sizeof(sh));
 400                 bzero(&final, sizeof(final));
 401                 inp = NULL;
 402                 net = NULL;
 403                 m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
 404                     (caddr_t)&sh);
 405                 ip6cp->ip6c_src->sin6_port = sh.src_port;
 406                 final.sin6_len = sizeof(final);
 407                 final.sin6_family = AF_INET6;
 408                 final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
 409                 final.sin6_port = sh.dest_port;
 410                 stcb = sctp_findassociation_addr_sa((struct sockaddr *)&final,
 411                     (struct sockaddr *)ip6cp->ip6c_src,
 412                     &inp, &net, 1, vrf_id);
 413                 /* inp's ref-count increased && stcb locked */
 414                 if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
 415                         if (cmd == PRC_MSGSIZE) {
 416                                 sctp6_notify_mbuf(inp,
 417                                     ip6cp->ip6c_icmp6,
 418                                     &sh,
 419                                     stcb,
 420                                     net);
 421                                 /* inp's ref-count reduced && stcb unlocked */
 422                         } else {
 423                                 sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
 424                                     (struct sockaddr *)&final,
 425                                     stcb, net);
 426                                 /* inp's ref-count reduced && stcb unlocked */
 427                         }
 428                 } else {
 429                         if (PRC_IS_REDIRECT(cmd) && inp) {
 430                                 in6_rtchange((struct in6pcb *)inp,
 431                                     inet6ctlerrmap[cmd]);
 432                         }
 433                         if (inp) {
 434                                 /* reduce inp's ref-count */
 435                                 SCTP_INP_WLOCK(inp);
 436                                 SCTP_INP_DECR_REF(inp);
 437                                 SCTP_INP_WUNLOCK(inp);
 438                         }
 439                         if (stcb)
 440                                 SCTP_TCB_UNLOCK(stcb);
 441                 }
 442         }
 443 }
 444
 445 /*
 446  * this routine can probably be collasped into the one in sctp_userreq.c
 447  * since they do the same thing and now we lookup with a sockaddr
 448  */
 449 static int
 450 sctp6_getcred(SYSCTL_HANDLER_ARGS)
 451 {
 452         struct xucred xuc;
 453         struct sockaddr_in6 addrs[2];
 454         struct sctp_inpcb *inp;
 455         struct sctp_nets *net;
 456         struct sctp_tcb *stcb;
 457         int error;
 458         uint32_t vrf_id;
 459
 460         vrf_id = SCTP_DEFAULT_VRFID;
 461
 462         error = priv_check(req->td, PRIV_NETINET_GETCRED);
 463         if (error)
 464                 return (error);
 465
 466         if (req->newlen != sizeof(addrs)) {
 467                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 468                 return (EINVAL);
 469         }
 470         if (req->oldlen != sizeof(struct ucred)) {
 471                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 472                 return (EINVAL);
 473         }
 474         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 475         if (error)
 476                 return (error);
 477
 478         stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
 479             sin6tosa(&addrs[0]),
 480             &inp, &net, 1, vrf_id);
 481         if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
 482                 if ((inp != NULL) && (stcb == NULL)) {
 483                         /* reduce ref-count */
 484                         SCTP_INP_WLOCK(inp);
 485                         SCTP_INP_DECR_REF(inp);
 486                         goto cred_can_cont;
 487                 }
 488                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
 489                 error = ENOENT;
 490                 goto out;
 491         }
 492         SCTP_TCB_UNLOCK(stcb);
 493         /*
 494          * We use the write lock here, only since in the error leg we need
 495          * it. If we used RLOCK, then we would have to
 496          * wlock/decr/unlock/rlock. Which in theory could create a hole.
 497          * Better to use higher wlock.
 498          */
 499         SCTP_INP_WLOCK(inp);
 500 cred_can_cont:
 501         error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
 502         if (error) {
 503                 SCTP_INP_WUNLOCK(inp);
 504                 goto out;
 505         }
 506         cru2x(inp->sctp_socket->so_cred, &xuc);
 507         SCTP_INP_WUNLOCK(inp);
 508         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 509 out:
 510         return (error);
 511 }
 512
 513 SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred, CTLTYPE_OPAQUE | CTLFLAG_RW,
 514     0, 0,
 515     sctp6_getcred, "S,ucred", "Get the ucred of a SCTP6 connection");
 516
 517
 518 /* This is the same as the sctp_abort() could be made common */
 519 static void
 520 sctp6_abort(struct socket *so)
 521 {
 522         struct sctp_inpcb *inp;
 523         uint32_t flags;
 524
 525         inp = (struct sctp_inpcb *)so->so_pcb;
 526         if (inp == NULL) {
 527                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 528                 return;
 529         }
 530 sctp_must_try_again:
 531         flags = inp->sctp_flags;
 532 #ifdef SCTP_LOG_CLOSING
 533         sctp_log_closing(inp, NULL, 17);
 534 #endif
 535         if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
 536             (atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
 537 #ifdef SCTP_LOG_CLOSING
 538                 sctp_log_closing(inp, NULL, 16);
 539 #endif
 540                 sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
 541                     SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
 542                 SOCK_LOCK(so);
 543                 SCTP_SB_CLEAR(so->so_snd);
 544                 /*
 545                  * same for the rcv ones, they are only here for the
 546                  * accounting/select.
 547                  */
 548                 SCTP_SB_CLEAR(so->so_rcv);
 549                 /* Now null out the reference, we are completely detached. */
 550                 so->so_pcb = NULL;
 551                 SOCK_UNLOCK(so);
 552         } else {
 553                 flags = inp->sctp_flags;
 554                 if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
 555                         goto sctp_must_try_again;
 556                 }
 557         }
 558         return;
 559 }
 560
 561 static int
 562 sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
 563 {
 564         struct in6pcb *inp6;
 565         int error;
 566         struct sctp_inpcb *inp;
 567         uint32_t vrf_id = SCTP_DEFAULT_VRFID;
 568
 569         inp = (struct sctp_inpcb *)so->so_pcb;
 570         if (inp != NULL) {
 571                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 572                 return (EINVAL);
 573         }
 574         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 575                 error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
 576                 if (error)
 577                         return (error);
 578         }
 579         error = sctp_inpcb_alloc(so, vrf_id);
 580         if (error)
 581                 return (error);
 582         inp = (struct sctp_inpcb *)so->so_pcb;
 583         SCTP_INP_WLOCK(inp);
 584         inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6;     /* I'm v6! */
 585         inp6 = (struct in6pcb *)inp;
 586
 587         inp6->inp_vflag |= INP_IPV6;
 588         inp6->in6p_hops = -1;   /* use kernel default */
 589         inp6->in6p_cksum = -1;  /* just to be sure */
 590 #ifdef INET
 591         /*
 592          * XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
 593          * socket as well, because the socket may be bound to an IPv6
 594          * wildcard address, which may match an IPv4-mapped IPv6 address.
 595          */
 596         inp6->inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
 597 #endif
 598         /*
 599          * Hmm what about the IPSEC stuff that is missing here but in
 600          * sctp_attach()?
 601          */
 602         SCTP_INP_WUNLOCK(inp);
 603         return (0);
 604 }
 605
 606 static int
 607 sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
 608 {
 609         struct sctp_inpcb *inp;
 610         struct in6pcb *inp6;
 611         int error;
 612
 613         inp = (struct sctp_inpcb *)so->so_pcb;
 614         if (inp == NULL) {
 615                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 616                 return (EINVAL);
 617         }
 618         if (addr) {
 619                 switch (addr->sa_family) {
 620 #ifdef INET
 621                 case AF_INET:
 622                         if (addr->sa_len != sizeof(struct sockaddr_in)) {
 623                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 624                                 return (EINVAL);
 625                         }
 626                         break;
 627 #endif
 628 #ifdef INET6
 629                 case AF_INET6:
 630                         if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 631                                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 632                                 return (EINVAL);
 633                         }
 634                         break;
 635 #endif
 636                 default:
 637                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 638                         return (EINVAL);
 639                 }
 640         }
 641         inp6 = (struct in6pcb *)inp;
 642         inp6->inp_vflag &= ~INP_IPV4;
 643         inp6->inp_vflag |= INP_IPV6;
 644         if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
 645                 switch (addr->sa_family) {
 646 #ifdef INET
 647                 case AF_INET:
 648                         /* binding v4 addr to v6 socket, so reset flags */
 649                         inp6->inp_vflag |= INP_IPV4;
 650                         inp6->inp_vflag &= ~INP_IPV6;
 651                         break;
 652 #endif
 653 #ifdef INET6
 654                 case AF_INET6:
 655                         {
 656                                 struct sockaddr_in6 *sin6_p;
 657
 658                                 sin6_p = (struct sockaddr_in6 *)addr;
 659
 660                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
 661                                         inp6->inp_vflag |= INP_IPV4;
 662                                 }
 663 #ifdef INET
 664                                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 665                                         struct sockaddr_in sin;
 666
 667                                         in6_sin6_2_sin(&sin, sin6_p);
 668                                         inp6->inp_vflag |= INP_IPV4;
 669                                         inp6->inp_vflag &= ~INP_IPV6;
 670                                         error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
 671                                         return (error);
 672                                 }
 673 #endif
 674                                 break;
 675                         }
 676 #endif
 677                 default:
 678                         break;
 679                 }
 680         } else if (addr != NULL) {
 681                 struct sockaddr_in6 *sin6_p;
 682
 683                 /* IPV6_V6ONLY socket */
 684 #ifdef INET
 685                 if (addr->sa_family == AF_INET) {
 686                         /* can't bind v4 addr to v6 only socket! */
 687                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 688                         return (EINVAL);
 689                 }
 690 #endif
 691                 sin6_p = (struct sockaddr_in6 *)addr;
 692
 693                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 694                         /* can't bind v4-mapped addrs either! */
 695                         /* NOTE: we don't support SIIT */
 696                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 697                         return (EINVAL);
 698                 }
 699         }
 700         error = sctp_inpcb_bind(so, addr, NULL, p);
 701         return (error);
 702 }
 703
 704
 705 static void
 706 sctp6_close(struct socket *so)
 707 {
 708         sctp_close(so);
 709 }
 710
 711 /* This could be made common with sctp_detach() since they are identical */
 712
 713 static
 714 int
 715 sctp6_disconnect(struct socket *so)
 716 {
 717         return (sctp_disconnect(so));
 718 }
 719
 720
 721 int
 722 sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 723     struct mbuf *control, struct thread *p);
 724
 725
 726 static int
 727 sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 728     struct mbuf *control, struct thread *p)
 729 {
 730         struct sctp_inpcb *inp;
 731         struct in6pcb *inp6;
 732
 733 #ifdef INET
 734         struct sockaddr_in6 *sin6;
 735
 736 #endif                          /* INET */
 737         /* No SPL needed since sctp_output does this */
 738
 739         inp = (struct sctp_inpcb *)so->so_pcb;
 740         if (inp == NULL) {
 741                 if (control) {
 742                         SCTP_RELEASE_PKT(control);
 743                         control = NULL;
 744                 }
 745                 SCTP_RELEASE_PKT(m);
 746                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 747                 return (EINVAL);
 748         }
 749         inp6 = (struct in6pcb *)inp;
 750         /*
 751          * For the TCP model we may get a NULL addr, if we are a connected
 752          * socket thats ok.
 753          */
 754         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
 755             (addr == NULL)) {
 756                 goto connected_type;
 757         }
 758         if (addr == NULL) {
 759                 SCTP_RELEASE_PKT(m);
 760                 if (control) {
 761                         SCTP_RELEASE_PKT(control);
 762                         control = NULL;
 763                 }
 764                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
 765                 return (EDESTADDRREQ);
 766         }
 767 #ifdef INET
 768         sin6 = (struct sockaddr_in6 *)addr;
 769         if (SCTP_IPV6_V6ONLY(inp6)) {
 770                 /*
 771                  * if IPV6_V6ONLY flag, we discard datagrams destined to a
 772                  * v4 addr or v4-mapped addr
 773                  */
 774                 if (addr->sa_family == AF_INET) {
 775                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 776                         return (EINVAL);
 777                 }
 778                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 779                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 780                         return (EINVAL);
 781                 }
 782         }
 783         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 784                 if (!MODULE_GLOBAL(ip6_v6only)) {
 785                         struct sockaddr_in sin;
 786
 787                         /* convert v4-mapped into v4 addr and send */
 788                         in6_sin6_2_sin(&sin, sin6);
 789                         return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin,
 790                             control, p));
 791                 } else {
 792                         /* mapped addresses aren't enabled */
 793                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 794                         return (EINVAL);
 795                 }
 796         }
 797 #endif                          /* INET */
 798 connected_type:
 799         /* now what about control */
 800         if (control) {
 801                 if (inp->control) {
 802                         SCTP_PRINTF("huh? control set?\n");
 803                         SCTP_RELEASE_PKT(inp->control);
 804                         inp->control = NULL;
 805                 }
 806                 inp->control = control;
 807         }
 808         /* Place the data */
 809         if (inp->pkt) {
 810                 SCTP_BUF_NEXT(inp->pkt_last) = m;
 811                 inp->pkt_last = m;
 812         } else {
 813                 inp->pkt_last = inp->pkt = m;
 814         }
 815         if (
 816         /* FreeBSD and MacOSX uses a flag passed */
 817             ((flags & PRUS_MORETOCOME) == 0)
 818             ) {
 819                 /*
 820                  * note with the current version this code will only be used
 821                  * by OpenBSD, NetBSD and FreeBSD have methods for
 822                  * re-defining sosend() to use sctp_sosend().  One can
 823                  * optionaly switch back to this code (by changing back the
 824                  * defininitions but this is not advisable.
 825                  */
 826                 int ret;
 827
 828                 ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
 829                 inp->pkt = NULL;
 830                 inp->control = NULL;
 831                 return (ret);
 832         } else {
 833                 return (0);
 834         }
 835 }
 836
 837 static int
 838 sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
 839 {
 840         uint32_t vrf_id;
 841         int error = 0;
 842         struct sctp_inpcb *inp;
 843         struct in6pcb *inp6;
 844         struct sctp_tcb *stcb;
 845
 846 #ifdef INET
 847         struct sockaddr_in6 *sin6;
 848         struct sockaddr_storage ss;
 849
 850 #endif
 851
 852         inp6 = (struct in6pcb *)so->so_pcb;
 853         inp = (struct sctp_inpcb *)so->so_pcb;
 854         if (inp == NULL) {
 855                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
 856                 return (ECONNRESET);    /* I made the same as TCP since we are
 857                                          * not setup? */
 858         }
 859         if (addr == NULL) {
 860                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 861                 return (EINVAL);
 862         }
 863         switch (addr->sa_family) {
 864 #ifdef INET
 865         case AF_INET:
 866                 if (addr->sa_len != sizeof(struct sockaddr_in)) {
 867                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 868                         return (EINVAL);
 869                 }
 870                 break;
 871 #endif
 872 #ifdef INET6
 873         case AF_INET6:
 874                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 875                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 876                         return (EINVAL);
 877                 }
 878                 break;
 879 #endif
 880         default:
 881                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 882                 return (EINVAL);
 883         }
 884
 885         vrf_id = inp->def_vrf_id;
 886         SCTP_ASOC_CREATE_LOCK(inp);
 887         SCTP_INP_RLOCK(inp);
 888         if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
 889             SCTP_PCB_FLAGS_UNBOUND) {
 890                 /* Bind a ephemeral port */
 891                 SCTP_INP_RUNLOCK(inp);
 892                 error = sctp6_bind(so, NULL, p);
 893                 if (error) {
 894                         SCTP_ASOC_CREATE_UNLOCK(inp);
 895
 896                         return (error);
 897                 }
 898                 SCTP_INP_RLOCK(inp);
 899         }
 900         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
 901             (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
 902                 /* We are already connected AND the TCP model */
 903                 SCTP_INP_RUNLOCK(inp);
 904                 SCTP_ASOC_CREATE_UNLOCK(inp);
 905                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
 906                 return (EADDRINUSE);
 907         }
 908 #ifdef INET
 909         sin6 = (struct sockaddr_in6 *)addr;
 910         if (SCTP_IPV6_V6ONLY(inp6)) {
 911                 /*
 912                  * if IPV6_V6ONLY flag, ignore connections destined to a v4
 913                  * addr or v4-mapped addr
 914                  */
 915                 if (addr->sa_family == AF_INET) {
 916                         SCTP_INP_RUNLOCK(inp);
 917                         SCTP_ASOC_CREATE_UNLOCK(inp);
 918                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 919                         return (EINVAL);
 920                 }
 921                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 922                         SCTP_INP_RUNLOCK(inp);
 923                         SCTP_ASOC_CREATE_UNLOCK(inp);
 924                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 925                         return (EINVAL);
 926                 }
 927         }
 928         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 929                 if (!MODULE_GLOBAL(ip6_v6only)) {
 930                         /* convert v4-mapped into v4 addr */
 931                         in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
 932                         addr = (struct sockaddr *)&ss;
 933                 } else {
 934                         /* mapped addresses aren't enabled */
 935                         SCTP_INP_RUNLOCK(inp);
 936                         SCTP_ASOC_CREATE_UNLOCK(inp);
 937                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
 938                         return (EINVAL);
 939                 }
 940         }
 941 #endif                          /* INET */
 942         /* Now do we connect? */
 943         if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
 944                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
 945                 if (stcb) {
 946                         SCTP_TCB_UNLOCK(stcb);
 947                 }
 948                 SCTP_INP_RUNLOCK(inp);
 949         } else {
 950                 SCTP_INP_RUNLOCK(inp);
 951                 SCTP_INP_WLOCK(inp);
 952                 SCTP_INP_INCR_REF(inp);
 953                 SCTP_INP_WUNLOCK(inp);
 954                 stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
 955                 if (stcb == NULL) {
 956                         SCTP_INP_WLOCK(inp);
 957                         SCTP_INP_DECR_REF(inp);
 958                         SCTP_INP_WUNLOCK(inp);
 959                 }
 960         }
 961
 962         if (stcb != NULL) {
 963                 /* Already have or am bring up an association */
 964                 SCTP_ASOC_CREATE_UNLOCK(inp);
 965                 SCTP_TCB_UNLOCK(stcb);
 966                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
 967                 return (EALREADY);
 968         }
 969         /* We are GOOD to go */
 970         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id, p);
 971         SCTP_ASOC_CREATE_UNLOCK(inp);
 972         if (stcb == NULL) {
 973                 /* Gak! no memory */
 974                 return (error);
 975         }
 976         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
 977                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
 978                 /* Set the connected flag so we can queue data */
 979                 soisconnecting(so);
 980         }
 981         stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
 982         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
 983
 984         /* initialize authentication parameters for the assoc */
 985         sctp_initialize_auth_params(inp, stcb);
 986
 987         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
 988         SCTP_TCB_UNLOCK(stcb);
 989         return (error);
 990 }
 991
 992 static int
 993 sctp6_getaddr(struct socket *so, struct sockaddr **addr)
 994 {
 995         struct sockaddr_in6 *sin6;
 996         struct sctp_inpcb *inp;
 997         uint32_t vrf_id;
 998         struct sctp_ifa *sctp_ifa;
 999
1000         int error;
1001
1002         /*
1003          * Do the malloc first in case it blocks.
1004          */
1005         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
1006         if (sin6 == NULL)
1007                 return (ENOMEM);
1008         sin6->sin6_family = AF_INET6;
1009         sin6->sin6_len = sizeof(*sin6);
1010
1011         inp = (struct sctp_inpcb *)so->so_pcb;
1012         if (inp == NULL) {
1013                 SCTP_FREE_SONAME(sin6);
1014                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1015                 return (ECONNRESET);
1016         }
1017         SCTP_INP_RLOCK(inp);
1018         sin6->sin6_port = inp->sctp_lport;
1019         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
1020                 /* For the bound all case you get back 0 */
1021                 if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
1022                         struct sctp_tcb *stcb;
1023                         struct sockaddr_in6 *sin_a6;
1024                         struct sctp_nets *net;
1025                         int fnd;
1026
1027                         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1028                         if (stcb == NULL) {
1029                                 goto notConn6;
1030                         }
1031                         fnd = 0;
1032                         sin_a6 = NULL;
1033                         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1034                                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1035                                 if (sin_a6 == NULL)
1036                                         /* this will make coverity happy */
1037                                         continue;
1038
1039                                 if (sin_a6->sin6_family == AF_INET6) {
1040                                         fnd = 1;
1041                                         break;
1042                                 }
1043                         }
1044                         if ((!fnd) || (sin_a6 == NULL)) {
1045                                 /* punt */
1046                                 goto notConn6;
1047                         }
1048                         vrf_id = inp->def_vrf_id;
1049                         sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *) & net->ro, net, 0, vrf_id);
1050                         if (sctp_ifa) {
1051                                 sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
1052                         }
1053                 } else {
1054                         /* For the bound all case you get back 0 */
1055         notConn6:
1056                         memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
1057                 }
1058         } else {
1059                 /* Take the first IPv6 address in the list */
1060                 struct sctp_laddr *laddr;
1061                 int fnd = 0;
1062
1063                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
1064                         if (laddr->ifa->address.sa.sa_family == AF_INET6) {
1065                                 struct sockaddr_in6 *sin_a;
1066
1067                                 sin_a = (struct sockaddr_in6 *)&laddr->ifa->address.sin6;
1068                                 sin6->sin6_addr = sin_a->sin6_addr;
1069                                 fnd = 1;
1070                                 break;
1071                         }
1072                 }
1073                 if (!fnd) {
1074                         SCTP_FREE_SONAME(sin6);
1075                         SCTP_INP_RUNLOCK(inp);
1076                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1077                         return (ENOENT);
1078                 }
1079         }
1080         SCTP_INP_RUNLOCK(inp);
1081         /* Scoping things for v6 */
1082         if ((error = sa6_recoverscope(sin6)) != 0) {
1083                 SCTP_FREE_SONAME(sin6);
1084                 return (error);
1085         }
1086         (*addr) = (struct sockaddr *)sin6;
1087         return (0);
1088 }
1089
1090 static int
1091 sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
1092 {
1093         struct sockaddr_in6 *sin6;
1094         int fnd;
1095         struct sockaddr_in6 *sin_a6;
1096         struct sctp_inpcb *inp;
1097         struct sctp_tcb *stcb;
1098         struct sctp_nets *net;
1099         int error;
1100
1101         /* Do the malloc first in case it blocks. */
1102         SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
1103         if (sin6 == NULL)
1104                 return (ENOMEM);
1105         sin6->sin6_family = AF_INET6;
1106         sin6->sin6_len = sizeof(*sin6);
1107
1108         inp = (struct sctp_inpcb *)so->so_pcb;
1109         if ((inp == NULL) ||
1110             ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
1111                 /* UDP type and listeners will drop out here */
1112                 SCTP_FREE_SONAME(sin6);
1113                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
1114                 return (ENOTCONN);
1115         }
1116         SCTP_INP_RLOCK(inp);
1117         stcb = LIST_FIRST(&inp->sctp_asoc_list);
1118         if (stcb) {
1119                 SCTP_TCB_LOCK(stcb);
1120         }
1121         SCTP_INP_RUNLOCK(inp);
1122         if (stcb == NULL) {
1123                 SCTP_FREE_SONAME(sin6);
1124                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
1125                 return (ECONNRESET);
1126         }
1127         fnd = 0;
1128         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
1129                 sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
1130                 if (sin_a6->sin6_family == AF_INET6) {
1131                         fnd = 1;
1132                         sin6->sin6_port = stcb->rport;
1133                         sin6->sin6_addr = sin_a6->sin6_addr;
1134                         break;
1135                 }
1136         }
1137         SCTP_TCB_UNLOCK(stcb);
1138         if (!fnd) {
1139                 /* No IPv4 address */
1140                 SCTP_FREE_SONAME(sin6);
1141                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
1142                 return (ENOENT);
1143         }
1144         if ((error = sa6_recoverscope(sin6)) != 0)
1145                 return (error);
1146         *addr = (struct sockaddr *)sin6;
1147         return (0);
1148 }
1149
1150 static int
1151 sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
1152 {
1153 #ifdef INET
1154         struct sockaddr *addr;
1155
1156 #endif
1157         struct in6pcb *inp6 = sotoin6pcb(so);
1158         int error;
1159
1160         if (inp6 == NULL) {
1161                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1162                 return (EINVAL);
1163         }
1164         /* allow v6 addresses precedence */
1165         error = sctp6_getaddr(so, nam);
1166 #ifdef INET
1167         if (error) {
1168                 /* try v4 next if v6 failed */
1169                 error = sctp_ingetaddr(so, nam);
1170                 if (error) {
1171                         return (error);
1172                 }
1173                 addr = *nam;
1174                 /* if I'm V6ONLY, convert it to v4-mapped */
1175                 if (SCTP_IPV6_V6ONLY(inp6)) {
1176                         struct sockaddr_in6 sin6;
1177
1178                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1179                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1180                 }
1181         }
1182 #endif
1183         return (error);
1184 }
1185
1186
1187 static int
1188 sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
1189 {
1190 #ifdef INET
1191         struct sockaddr *addr;
1192
1193 #endif
1194         struct in6pcb *inp6 = sotoin6pcb(so);
1195         int error;
1196
1197         if (inp6 == NULL) {
1198                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
1199                 return (EINVAL);
1200         }
1201         /* allow v6 addresses precedence */
1202         error = sctp6_peeraddr(so, nam);
1203 #ifdef INET
1204         if (error) {
1205                 /* try v4 next if v6 failed */
1206                 error = sctp_peeraddr(so, nam);
1207                 if (error) {
1208                         return (error);
1209                 }
1210                 addr = *nam;
1211                 /* if I'm V6ONLY, convert it to v4-mapped */
1212                 if (SCTP_IPV6_V6ONLY(inp6)) {
1213                         struct sockaddr_in6 sin6;
1214
1215                         in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
1216                         memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
1217                 }
1218         }
1219 #endif
1220         return (error);
1221 }
1222
1223 struct pr_usrreqs sctp6_usrreqs = {
1224         .pru_abort = sctp6_abort,
1225         .pru_accept = sctp_accept,
1226         .pru_attach = sctp6_attach,
1227         .pru_bind = sctp6_bind,
1228         .pru_connect = sctp6_connect,
1229         .pru_control = in6_control,
1230         .pru_close = sctp6_close,
1231         .pru_detach = sctp6_close,
1232         .pru_sopoll = sopoll_generic,
1233         .pru_flush = sctp_flush,
1234         .pru_disconnect = sctp6_disconnect,
1235         .pru_listen = sctp_listen,
1236         .pru_peeraddr = sctp6_getpeeraddr,
1237         .pru_send = sctp6_send,
1238         .pru_shutdown = sctp_shutdown,
1239         .pru_sockaddr = sctp6_in6getaddr,
1240         .pru_sosend = sctp_sosend,
1241         .pru_soreceive = sctp_soreceive
1242 };