sys/netinet6/udp6_usrreq.c

   1 /*      $FreeBSD: src/sys/netinet6/udp6_usrreq.c,v 1.6.2.13 2003/01/24 05:11:35 sam Exp $       */
   2 /*      $DragonFly: src/sys/netinet6/udp6_usrreq.c,v 1.12 2004/03/31 00:43:09 hsu Exp $ */
   3 /*      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $    */
   4
   5 /*
   6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 1982, 1986, 1989, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  *      @(#)udp_var.h   8.1 (Berkeley) 6/10/93
  67  */
  68
  69 #include "opt_inet.h"
  70 #include "opt_inet6.h"
  71 #include "opt_ipsec.h"
  72
  73 #include <sys/param.h>
  74 #include <sys/kernel.h>
  75 #include <sys/mbuf.h>
  76 #include <sys/protosw.h>
  77 #include <sys/socket.h>
  78 #include <sys/socketvar.h>
  79 #include <sys/sysctl.h>
  80 #include <sys/errno.h>
  81 #include <sys/stat.h>
  82 #include <sys/systm.h>
  83 #include <sys/syslog.h>
  84 #include <sys/proc.h>
  85
  86 #include <net/if.h>
  87 #include <net/route.h>
  88 #include <net/if_types.h>
  89
  90 #include <netinet/in.h>
  91 #include <netinet/in_systm.h>
  92 #include <netinet/ip.h>
  93 #include <netinet/in_pcb.h>
  94 #include <netinet/in_var.h>
  95 #include <netinet/ip_var.h>
  96 #include <netinet/udp.h>
  97 #include <netinet/udp_var.h>
  98 #include <netinet/ip6.h>
  99 #include <netinet6/ip6_var.h>
 100 #include <netinet6/in6_pcb.h>
 101 #include <netinet/icmp6.h>
 102 #include <netinet6/udp6_var.h>
 103 #include <netinet6/ip6protosw.h>
 104
 105 #ifdef IPSEC
 106 #include <netinet6/ipsec.h>
 107 #include <netinet6/ipsec6.h>
 108 #endif /* IPSEC */
 109
 110 #ifdef FAST_IPSEC
 111 #include "ipsec.h"
 112 #include "ipsec6.h"
 113 #endif /* FAST_IPSEC */
 114
 115 /*
 116  * UDP protocol inplementation.
 117  * Per RFC 768, August, 1980.
 118  */
 119
 120 extern  struct protosw inetsw[];
 121 static  int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *);
 122 static  int udp6_detach (struct socket *so);
 123
 124 static int
 125 in6_mcmatch(in6p, ia6, ifp)
 126         struct inpcb *in6p;
 127         struct in6_addr *ia6;
 128         struct ifnet *ifp;
 129 {
 130         struct ip6_moptions *im6o = in6p->in6p_moptions;
 131         struct in6_multi_mship *imm;
 132
 133         if (im6o == NULL)
 134                 return 0;
 135
 136         for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
 137              imm = imm->i6mm_chain.le_next) {
 138                 if ((ifp == NULL ||
 139                      imm->i6mm_maddr->in6m_ifp == ifp) &&
 140                     IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
 141                                        ia6))
 142                         return 1;
 143         }
 144         return 0;
 145 }
 146
 147 int
 148 udp6_input(struct mbuf **mp, int *offp, int proto)
 149 {
 150         struct mbuf *m = *mp;
 151         struct ip6_hdr *ip6;
 152         struct udphdr *uh;
 153         struct inpcb *in6p;
 154         struct  mbuf *opts = NULL;
 155         int off = *offp;
 156         int plen, ulen;
 157         struct sockaddr_in6 udp_in6;
 158
 159         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
 160
 161         ip6 = mtod(m, struct ip6_hdr *);
 162
 163         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
 164                 /* XXX send icmp6 host/port unreach? */
 165                 m_freem(m);
 166                 return IPPROTO_DONE;
 167         }
 168
 169         udpstat.udps_ipackets++;
 170
 171         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 172         uh = (struct udphdr *)((caddr_t)ip6 + off);
 173         ulen = ntohs((u_short)uh->uh_ulen);
 174
 175         if (plen != ulen) {
 176                 udpstat.udps_badlen++;
 177                 goto bad;
 178         }
 179
 180         /*
 181          * Checksum extended UDP header and data.
 182          */
 183         if (uh->uh_sum == 0)
 184                 udpstat.udps_nosum++;
 185         else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
 186                 udpstat.udps_badsum++;
 187                 goto bad;
 188         }
 189
 190         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 191                 struct  inpcb *last;
 192
 193                 /*
 194                  * Deliver a multicast datagram to all sockets
 195                  * for which the local and remote addresses and ports match
 196                  * those of the incoming datagram.  This allows more than
 197                  * one process to receive multicasts on the same port.
 198                  * (This really ought to be done for unicast datagrams as
 199                  * well, but that would cause problems with existing
 200                  * applications that open both address-specific sockets and
 201                  * a wildcard socket listening to the same port -- they would
 202                  * end up receiving duplicates of every unicast datagram.
 203                  * Those applications open the multiple sockets to overcome an
 204                  * inadequacy of the UDP socket interface, but for backwards
 205                  * compatibility we avoid the problem here rather than
 206                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 207                  */
 208
 209                 /*
 210                  * In a case that laddr should be set to the link-local
 211                  * address (this happens in RIPng), the multicast address
 212                  * specified in the received packet does not match with
 213                  * laddr. To cure this situation, the matching is relaxed
 214                  * if the receiving interface is the same as one specified
 215                  * in the socket and if the destination multicast address
 216                  * matches one of the multicast groups specified in the socket.
 217                  */
 218
 219                 /*
 220                  * Construct sockaddr format source address.
 221                  */
 222                 init_sin6(&udp_in6, m); /* general init */
 223                 udp_in6.sin6_port = uh->uh_sport;
 224                 /*
 225                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
 226                  * We need udphdr for IPsec processing so we do that later.
 227                  */
 228
 229                 /*
 230                  * Locate pcb(s) for datagram.
 231                  * (Algorithm copied from raw_intr().)
 232                  */
 233                 last = NULL;
 234                 LIST_FOREACH(in6p, &udbinfo.listhead, inp_list) {
 235                         if ((in6p->inp_vflag & INP_IPV6) == 0)
 236                                 continue;
 237                         if (in6p->in6p_lport != uh->uh_dport)
 238                                 continue;
 239                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
 240                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
 241                                                         &ip6->ip6_dst) &&
 242                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
 243                                                  m->m_pkthdr.rcvif))
 244                                         continue;
 245                         }
 246                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 247                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
 248                                                         &ip6->ip6_src) ||
 249                                    in6p->in6p_fport != uh->uh_sport)
 250                                         continue;
 251                         }
 252
 253                         if (last != NULL) {
 254                                 struct  mbuf *n;
 255
 256 #ifdef IPSEC
 257                                 /*
 258                                  * Check AH/ESP integrity.
 259                                  */
 260                                 if (ipsec6_in_reject_so(m, last->inp_socket))
 261                                         ipsec6stat.in_polvio++;
 262                                         /* do not inject data into pcb */
 263                                 else
 264 #endif /* IPSEC */
 265 #ifdef FAST_IPSEC
 266                                 /*
 267                                  * Check AH/ESP integrity.
 268                                  */
 269                                 if (ipsec6_in_reject(m, last))
 270                                         ;
 271                                 else
 272 #endif /* FAST_IPSEC */
 273                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 274                                         /*
 275                                          * KAME NOTE: do not
 276                                          * m_copy(m, offset, ...) above.
 277                                          * sbappendaddr() expects M_PKTHDR,
 278                                          * and m_copy() will copy M_PKTHDR
 279                                          * only if offset is 0.
 280                                          */
 281                                         if (last->in6p_flags & IN6P_CONTROLOPTS
 282                                             || last->in6p_socket->so_options & SO_TIMESTAMP)
 283                                                 ip6_savecontrol(last, &opts,
 284                                                                 ip6, n);
 285
 286                                         m_adj(n, off + sizeof(struct udphdr));
 287                                         if (sbappendaddr(&last->in6p_socket->so_rcv,
 288                                                         (struct sockaddr *)&udp_in6,
 289                                                         n, opts) == 0) {
 290                                                 m_freem(n);
 291                                                 if (opts)
 292                                                         m_freem(opts);
 293                                                 udpstat.udps_fullsock++;
 294                                         } else
 295                                                 sorwakeup(last->in6p_socket);
 296                                         opts = NULL;
 297                                 }
 298                         }
 299                         last = in6p;
 300                         /*
 301                          * Don't look for additional matches if this one does
 302                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 303                          * socket options set.  This heuristic avoids searching
 304                          * through all pcbs in the common case of a non-shared
 305                          * port.  It assumes that an application will never
 306                          * clear these options after setting them.
 307                          */
 308                         if ((last->in6p_socket->so_options &
 309                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 310                                 break;
 311                 }
 312
 313                 if (last == NULL) {
 314                         /*
 315                          * No matching pcb found; discard datagram.
 316                          * (No need to send an ICMP Port Unreachable
 317                          * for a broadcast or multicast datgram.)
 318                          */
 319                         udpstat.udps_noport++;
 320                         udpstat.udps_noportmcast++;
 321                         goto bad;
 322                 }
 323 #ifdef IPSEC
 324                 /*
 325                  * Check AH/ESP integrity.
 326                  */
 327                 if (ipsec6_in_reject_so(m, last->inp_socket)) {
 328                         ipsec6stat.in_polvio++;
 329                         goto bad;
 330                 }
 331 #endif /* IPSEC */
 332 #ifdef FAST_IPSEC
 333                 /*
 334                  * Check AH/ESP integrity.
 335                  */
 336                 if (ipsec6_in_reject(m, last)) {
 337                         goto bad;
 338                 }
 339 #endif /* FAST_IPSEC */
 340                 if (last->in6p_flags & IN6P_CONTROLOPTS
 341                     || last->in6p_socket->so_options & SO_TIMESTAMP)
 342                         ip6_savecontrol(last, &opts, ip6, m);
 343
 344                 m_adj(m, off + sizeof(struct udphdr));
 345                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 346                                 (struct sockaddr *)&udp_in6,
 347                                 m, opts) == 0) {
 348                         udpstat.udps_fullsock++;
 349                         goto bad;
 350                 }
 351                 sorwakeup(last->in6p_socket);
 352                 return IPPROTO_DONE;
 353         }
 354         /*
 355          * Locate pcb for datagram.
 356          */
 357         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
 358                                   &ip6->ip6_dst, uh->uh_dport, 1,
 359                                   m->m_pkthdr.rcvif);
 360         if (in6p == 0) {
 361                 if (log_in_vain) {
 362                         char buf[INET6_ADDRSTRLEN];
 363
 364                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
 365                         log(LOG_INFO,
 366                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 367                             buf, ntohs(uh->uh_dport),
 368                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
 369                 }
 370                 udpstat.udps_noport++;
 371                 if (m->m_flags & M_MCAST) {
 372                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
 373                         udpstat.udps_noportmcast++;
 374                         goto bad;
 375                 }
 376                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 377                 return IPPROTO_DONE;
 378         }
 379 #ifdef IPSEC
 380         /*
 381          * Check AH/ESP integrity.
 382          */
 383         if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
 384                 ipsec6stat.in_polvio++;
 385                 goto bad;
 386         }
 387 #endif /* IPSEC */
 388 #ifdef FAST_IPSEC
 389         /*
 390          * Check AH/ESP integrity.
 391          */
 392         if (ipsec6_in_reject(m, in6p)) {
 393                 goto bad;
 394         }
 395 #endif /* FAST_IPSEC */
 396
 397         /*
 398          * Construct sockaddr format source address.
 399          * Stuff source address and datagram in user buffer.
 400          */
 401         init_sin6(&udp_in6, m); /* general init */
 402         udp_in6.sin6_port = uh->uh_sport;
 403         if (in6p->in6p_flags & IN6P_CONTROLOPTS
 404             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
 405                 ip6_savecontrol(in6p, &opts, ip6, m);
 406         m_adj(m, off + sizeof(struct udphdr));
 407         if (sbappendaddr(&in6p->in6p_socket->so_rcv,
 408                         (struct sockaddr *)&udp_in6,
 409                         m, opts) == 0) {
 410                 udpstat.udps_fullsock++;
 411                 goto bad;
 412         }
 413         sorwakeup(in6p->in6p_socket);
 414         return IPPROTO_DONE;
 415 bad:
 416         if (m)
 417                 m_freem(m);
 418         if (opts)
 419                 m_freem(opts);
 420         return IPPROTO_DONE;
 421 }
 422
 423 void
 424 udp6_ctlinput(cmd, sa, d)
 425         int cmd;
 426         struct sockaddr *sa;
 427         void *d;
 428 {
 429         struct udphdr uh;
 430         struct ip6_hdr *ip6;
 431         struct mbuf *m;
 432         int off = 0;
 433         struct ip6ctlparam *ip6cp = NULL;
 434         const struct sockaddr_in6 *sa6_src = NULL;
 435         void (*notify) (struct inpcb *, int) = udp_notify;
 436         struct udp_portonly {
 437                 u_int16_t uh_sport;
 438                 u_int16_t uh_dport;
 439         } *uhp;
 440
 441         if (sa->sa_family != AF_INET6 ||
 442             sa->sa_len != sizeof(struct sockaddr_in6))
 443                 return;
 444
 445         if ((unsigned)cmd >= PRC_NCMDS)
 446                 return;
 447         if (PRC_IS_REDIRECT(cmd))
 448                 notify = in6_rtchange, d = NULL;
 449         else if (cmd == PRC_HOSTDEAD)
 450                 d = NULL;
 451         else if (inet6ctlerrmap[cmd] == 0)
 452                 return;
 453
 454         /* if the parameter is from icmp6, decode it. */
 455         if (d != NULL) {
 456                 ip6cp = (struct ip6ctlparam *)d;
 457                 m = ip6cp->ip6c_m;
 458                 ip6 = ip6cp->ip6c_ip6;
 459                 off = ip6cp->ip6c_off;
 460                 sa6_src = ip6cp->ip6c_src;
 461         } else {
 462                 m = NULL;
 463                 ip6 = NULL;
 464                 sa6_src = &sa6_any;
 465         }
 466
 467         if (ip6) {
 468                 /*
 469                  * XXX: We assume that when IPV6 is non NULL,
 470                  * M and OFF are valid.
 471                  */
 472
 473                 /* check if we can safely examine src and dst ports */
 474                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 475                         return;
 476
 477                 bzero(&uh, sizeof(uh));
 478                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 479
 480                 (void) in6_pcbnotify(&udbinfo.listhead, sa, uh.uh_dport,
 481                                      (struct sockaddr *)ip6cp->ip6c_src,
 482                                      uh.uh_sport, cmd, notify);
 483         } else
 484                 (void) in6_pcbnotify(&udbinfo.listhead, sa, 0,
 485                                      (const struct sockaddr *)sa6_src,
 486                                      0, cmd, notify);
 487 }
 488
 489 static int
 490 udp6_getcred(SYSCTL_HANDLER_ARGS)
 491 {
 492         struct sockaddr_in6 addrs[2];
 493         struct inpcb *inp;
 494         int error, s;
 495
 496         error = suser(req->td);
 497         if (error)
 498                 return (error);
 499
 500         if (req->newlen != sizeof(addrs))
 501                 return (EINVAL);
 502         if (req->oldlen != sizeof(struct ucred))
 503                 return (EINVAL);
 504         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 505         if (error)
 506                 return (error);
 507         s = splnet();
 508         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
 509                                  addrs[1].sin6_port,
 510                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
 511                                  1, NULL);
 512         if (!inp || !inp->inp_socket) {
 513                 error = ENOENT;
 514                 goto out;
 515         }
 516         error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
 517                            sizeof(struct ucred));
 518
 519 out:
 520         splx(s);
 521         return (error);
 522 }
 523
 524 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 525             0, 0,
 526             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
 527
 528 static int
 529 udp6_abort(struct socket *so)
 530 {
 531         struct inpcb *inp;
 532         int s;
 533
 534         inp = sotoinpcb(so);
 535         if (inp == 0)
 536                 return EINVAL;  /* ??? possible? panic instead? */
 537         soisdisconnected(so);
 538         s = splnet();
 539         in6_pcbdetach(inp);
 540         splx(s);
 541         return 0;
 542 }
 543
 544 static int
 545 udp6_attach(struct socket *so, int proto, struct pru_attach_info *ai)
 546 {
 547         struct inpcb *inp;
 548         int s, error;
 549
 550         inp = sotoinpcb(so);
 551         if (inp != 0)
 552                 return EINVAL;
 553
 554         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 555                 error = soreserve(so, udp_sendspace, udp_recvspace,
 556                     ai->sb_rlimit);
 557                 if (error)
 558                         return error;
 559         }
 560         s = splnet();
 561         error = in_pcballoc(so, &udbinfo);
 562         splx(s);
 563         if (error)
 564                 return error;
 565         inp = (struct inpcb *)so->so_pcb;
 566         inp->inp_vflag |= INP_IPV6;
 567         if (!ip6_v6only)
 568                 inp->inp_vflag |= INP_IPV4;
 569         inp->in6p_hops = -1;    /* use kernel default */
 570         inp->in6p_cksum = -1;   /* just to be sure */
 571         /*
 572          * XXX: ugly!!
 573          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 574          * because the socket may be bound to an IPv6 wildcard address,
 575          * which may match an IPv4-mapped IPv6 address.
 576          */
 577         inp->inp_ip_ttl = ip_defttl;
 578         return 0;
 579 }
 580
 581 static int
 582 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 583 {
 584         struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
 585         struct inpcb *inp;
 586         int s, error;
 587
 588         inp = sotoinpcb(so);
 589         if (inp == 0)
 590                 return EINVAL;
 591
 592         inp->inp_vflag &= ~INP_IPV4;
 593         inp->inp_vflag |= INP_IPV6;
 594         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 595                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 596                         inp->inp_vflag |= INP_IPV4;
 597                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 598                         struct sockaddr_in sin;
 599
 600                         in6_sin6_2_sin(&sin, sin6_p);
 601                         inp->inp_vflag |= INP_IPV4;
 602                         inp->inp_vflag &= ~INP_IPV6;
 603                         s = splnet();
 604                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
 605                         splx(s);
 606                         return error;
 607                 }
 608         }
 609
 610         s = splnet();
 611         error = in6_pcbbind(inp, nam, td);
 612         splx(s);
 613         if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 614                 inp->inp_flags |= INP_WASBOUND_NOTANY;
 615         in_pcbinswildcardhash(inp);
 616         return error;
 617 }
 618
 619 static int
 620 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 621 {
 622         struct inpcb *inp;
 623         int s, error;
 624
 625         inp = sotoinpcb(so);
 626         if (inp == 0)
 627                 return EINVAL;
 628
 629         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 630                 struct sockaddr_in6 *sin6_p;
 631
 632                 sin6_p = (struct sockaddr_in6 *)nam;
 633                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 634                         struct sockaddr_in sin;
 635
 636                         if (inp->inp_faddr.s_addr != INADDR_ANY)
 637                                 return EISCONN;
 638                         in6_sin6_2_sin(&sin, sin6_p);
 639                         s = splnet();
 640                         error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
 641                         splx(s);
 642                         if (error == 0) {
 643                                 inp->inp_vflag |= INP_IPV4;
 644                                 inp->inp_vflag &= ~INP_IPV6;
 645                                 soisconnected(so);
 646                         }
 647                         return error;
 648                 }
 649         }
 650         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 651                 return EISCONN;
 652         if (inp->inp_flags & INP_WILDCARD)
 653                 in_pcbremwildcardhash(inp);
 654         s = splnet();
 655         error = in6_pcbconnect(inp, nam, td);
 656         splx(s);
 657         if (error == 0) {
 658                 if (!ip6_v6only) { /* should be non mapped addr */
 659                         inp->inp_vflag &= ~INP_IPV4;
 660                         inp->inp_vflag |= INP_IPV6;
 661                 }
 662                 soisconnected(so);
 663         } else if (error == EAFNOSUPPORT) {     /* connection dissolved */
 664                 /*
 665                  * Follow traditional BSD behavior and retain
 666                  * the local port binding.  But, fix the old misbehavior
 667                  * of overwriting any previously bound local address.
 668                  */
 669                 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
 670                         inp->in6p_laddr = in6addr_any;
 671                 in_pcbinswildcardhash(inp);
 672         }
 673         return error;
 674 }
 675
 676 static int
 677 udp6_detach(struct socket *so)
 678 {
 679         struct inpcb *inp;
 680         int s;
 681
 682         inp = sotoinpcb(so);
 683         if (inp == 0)
 684                 return EINVAL;
 685         s = splnet();
 686         in6_pcbdetach(inp);
 687         splx(s);
 688         return 0;
 689 }
 690
 691 static int
 692 udp6_disconnect(struct socket *so)
 693 {
 694         struct inpcb *inp;
 695         int s;
 696
 697         inp = sotoinpcb(so);
 698         if (inp == 0)
 699                 return EINVAL;
 700
 701         if (inp->inp_vflag & INP_IPV4) {
 702                 struct pr_usrreqs *pru;
 703
 704                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 705                 return ((*pru->pru_disconnect)(so));
 706         }
 707
 708         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 709                 return ENOTCONN;
 710
 711         s = splnet();
 712         in6_pcbdisconnect(inp);
 713         splx(s);
 714         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 715         return 0;
 716 }
 717
 718 static int
 719 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 720           struct mbuf *control, struct thread *td)
 721 {
 722         struct inpcb *inp;
 723         int error = 0;
 724
 725         inp = sotoinpcb(so);
 726         if (inp == 0) {
 727                 error = EINVAL;
 728                 goto bad;
 729         }
 730
 731         if (addr) {
 732                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 733                         error = EINVAL;
 734                         goto bad;
 735                 }
 736                 if (addr->sa_family != AF_INET6) {
 737                         error = EAFNOSUPPORT;
 738                         goto bad;
 739                 }
 740         }
 741
 742         if (!ip6_v6only) {
 743                 int hasv4addr;
 744                 struct sockaddr_in6 *sin6 = 0;
 745
 746                 if (addr == 0)
 747                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 748                 else {
 749                         sin6 = (struct sockaddr_in6 *)addr;
 750                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 751                                 ? 1 : 0;
 752                 }
 753                 if (hasv4addr) {
 754                         struct pr_usrreqs *pru;
 755
 756                         if (sin6)
 757                                 in6_sin6_2_sin_in_sock(addr);
 758                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 759                         error = ((*pru->pru_send)(so, flags, m, addr,
 760                                     control, td));
 761                         /* addr will just be freed in sendit(). */
 762                         return error;
 763                 }
 764         }
 765
 766         return udp6_output(inp, m, addr, control, td);
 767
 768   bad:
 769         m_freem(m);
 770         return(error);
 771 }
 772
 773 struct pr_usrreqs udp6_usrreqs = {
 774         udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
 775         pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
 776         pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
 777         pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
 778         in6_mapped_sockaddr, sosend, soreceive, sopoll
 779 };