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 1.18 2005/02/08 22:56:19 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 <netproto/ipsec/ipsec.h>
 112 #include <netproto/ipsec/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(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp)
 126 {
 127         struct ip6_moptions *im6o = in6p->in6p_moptions;
 128         struct in6_multi_mship *imm;
 129
 130         if (im6o == NULL)
 131                 return 0;
 132
 133         for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
 134              imm = imm->i6mm_chain.le_next) {
 135                 if ((ifp == NULL ||
 136                      imm->i6mm_maddr->in6m_ifp == ifp) &&
 137                     IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
 138                                        ia6))
 139                         return 1;
 140         }
 141         return 0;
 142 }
 143
 144 int
 145 udp6_input(struct mbuf **mp, int *offp, int proto)
 146 {
 147         struct mbuf *m = *mp;
 148         struct ip6_hdr *ip6;
 149         struct udphdr *uh;
 150         struct inpcb *in6p;
 151         struct  mbuf *opts = NULL;
 152         int off = *offp;
 153         int plen, ulen;
 154         struct sockaddr_in6 udp_in6;
 155
 156         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
 157
 158         ip6 = mtod(m, struct ip6_hdr *);
 159
 160         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
 161                 /* XXX send icmp6 host/port unreach? */
 162                 m_freem(m);
 163                 return IPPROTO_DONE;
 164         }
 165
 166         udpstat.udps_ipackets++;
 167
 168         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 169         uh = (struct udphdr *)((caddr_t)ip6 + off);
 170         ulen = ntohs((u_short)uh->uh_ulen);
 171
 172         if (plen != ulen) {
 173                 udpstat.udps_badlen++;
 174                 goto bad;
 175         }
 176
 177         /*
 178          * Checksum extended UDP header and data.
 179          */
 180         if (uh->uh_sum == 0)
 181                 udpstat.udps_nosum++;
 182         else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
 183                 udpstat.udps_badsum++;
 184                 goto bad;
 185         }
 186
 187         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 188                 struct  inpcb *last;
 189
 190                 /*
 191                  * Deliver a multicast datagram to all sockets
 192                  * for which the local and remote addresses and ports match
 193                  * those of the incoming datagram.  This allows more than
 194                  * one process to receive multicasts on the same port.
 195                  * (This really ought to be done for unicast datagrams as
 196                  * well, but that would cause problems with existing
 197                  * applications that open both address-specific sockets and
 198                  * a wildcard socket listening to the same port -- they would
 199                  * end up receiving duplicates of every unicast datagram.
 200                  * Those applications open the multiple sockets to overcome an
 201                  * inadequacy of the UDP socket interface, but for backwards
 202                  * compatibility we avoid the problem here rather than
 203                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 204                  */
 205
 206                 /*
 207                  * In a case that laddr should be set to the link-local
 208                  * address (this happens in RIPng), the multicast address
 209                  * specified in the received packet does not match with
 210                  * laddr. To cure this situation, the matching is relaxed
 211                  * if the receiving interface is the same as one specified
 212                  * in the socket and if the destination multicast address
 213                  * matches one of the multicast groups specified in the socket.
 214                  */
 215
 216                 /*
 217                  * Construct sockaddr format source address.
 218                  */
 219                 init_sin6(&udp_in6, m); /* general init */
 220                 udp_in6.sin6_port = uh->uh_sport;
 221                 /*
 222                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
 223                  * We need udphdr for IPsec processing so we do that later.
 224                  */
 225
 226                 /*
 227                  * Locate pcb(s) for datagram.
 228                  * (Algorithm copied from raw_intr().)
 229                  */
 230                 last = NULL;
 231                 LIST_FOREACH(in6p, &udbinfo.pcblisthead, inp_list) {
 232                         if ((in6p->inp_flags & INP_PLACEMARKER) == 0)
 233                                 continue;
 234                         if ((in6p->inp_vflag & INP_IPV6) == 0)
 235                                 continue;
 236                         if (in6p->in6p_lport != uh->uh_dport)
 237                                 continue;
 238                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
 239                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
 240                                                         &ip6->ip6_dst) &&
 241                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
 242                                                  m->m_pkthdr.rcvif))
 243                                         continue;
 244                         }
 245                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 246                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
 247                                                         &ip6->ip6_src) ||
 248                                    in6p->in6p_fport != uh->uh_sport)
 249                                         continue;
 250                         }
 251
 252                         if (last != NULL) {
 253                                 struct  mbuf *n;
 254
 255 #ifdef IPSEC
 256                                 /*
 257                                  * Check AH/ESP integrity.
 258                                  */
 259                                 if (ipsec6_in_reject_so(m, last->inp_socket))
 260                                         ipsec6stat.in_polvio++;
 261                                         /* do not inject data into pcb */
 262                                 else
 263 #endif /* IPSEC */
 264 #ifdef FAST_IPSEC
 265                                 /*
 266                                  * Check AH/ESP integrity.
 267                                  */
 268                                 if (ipsec6_in_reject(m, last))
 269                                         ;
 270                                 else
 271 #endif /* FAST_IPSEC */
 272                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 273                                         /*
 274                                          * KAME NOTE: do not
 275                                          * m_copy(m, offset, ...) above.
 276                                          * sbappendaddr() expects M_PKTHDR,
 277                                          * and m_copy() will copy M_PKTHDR
 278                                          * only if offset is 0.
 279                                          */
 280                                         if (last->in6p_flags & IN6P_CONTROLOPTS
 281                                             || last->in6p_socket->so_options & SO_TIMESTAMP)
 282                                                 ip6_savecontrol(last, &opts,
 283                                                                 ip6, n);
 284
 285                                         m_adj(n, off + sizeof(struct udphdr));
 286                                         if (sbappendaddr(&last->in6p_socket->so_rcv,
 287                                                         (struct sockaddr *)&udp_in6,
 288                                                         n, opts) == 0) {
 289                                                 m_freem(n);
 290                                                 if (opts)
 291                                                         m_freem(opts);
 292                                                 udpstat.udps_fullsock++;
 293                                         } else
 294                                                 sorwakeup(last->in6p_socket);
 295                                         opts = NULL;
 296                                 }
 297                         }
 298                         last = in6p;
 299                         /*
 300                          * Don't look for additional matches if this one does
 301                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 302                          * socket options set.  This heuristic avoids searching
 303                          * through all pcbs in the common case of a non-shared
 304                          * port.  It assumes that an application will never
 305                          * clear these options after setting them.
 306                          */
 307                         if ((last->in6p_socket->so_options &
 308                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 309                                 break;
 310                 }
 311
 312                 if (last == NULL) {
 313                         /*
 314                          * No matching pcb found; discard datagram.
 315                          * (No need to send an ICMP Port Unreachable
 316                          * for a broadcast or multicast datgram.)
 317                          */
 318                         udpstat.udps_noport++;
 319                         udpstat.udps_noportmcast++;
 320                         goto bad;
 321                 }
 322 #ifdef IPSEC
 323                 /*
 324                  * Check AH/ESP integrity.
 325                  */
 326                 if (ipsec6_in_reject_so(m, last->inp_socket)) {
 327                         ipsec6stat.in_polvio++;
 328                         goto bad;
 329                 }
 330 #endif /* IPSEC */
 331 #ifdef FAST_IPSEC
 332                 /*
 333                  * Check AH/ESP integrity.
 334                  */
 335                 if (ipsec6_in_reject(m, last)) {
 336                         goto bad;
 337                 }
 338 #endif /* FAST_IPSEC */
 339                 if (last->in6p_flags & IN6P_CONTROLOPTS
 340                     || last->in6p_socket->so_options & SO_TIMESTAMP)
 341                         ip6_savecontrol(last, &opts, ip6, m);
 342
 343                 m_adj(m, off + sizeof(struct udphdr));
 344                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 345                                 (struct sockaddr *)&udp_in6,
 346                                 m, opts) == 0) {
 347                         udpstat.udps_fullsock++;
 348                         goto bad;
 349                 }
 350                 sorwakeup(last->in6p_socket);
 351                 return IPPROTO_DONE;
 352         }
 353         /*
 354          * Locate pcb for datagram.
 355          */
 356         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
 357                                   &ip6->ip6_dst, uh->uh_dport, 1,
 358                                   m->m_pkthdr.rcvif);
 359         if (in6p == 0) {
 360                 if (log_in_vain) {
 361                         char buf[INET6_ADDRSTRLEN];
 362
 363                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
 364                         log(LOG_INFO,
 365                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 366                             buf, ntohs(uh->uh_dport),
 367                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
 368                 }
 369                 udpstat.udps_noport++;
 370                 if (m->m_flags & M_MCAST) {
 371                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
 372                         udpstat.udps_noportmcast++;
 373                         goto bad;
 374                 }
 375                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 376                 return IPPROTO_DONE;
 377         }
 378 #ifdef IPSEC
 379         /*
 380          * Check AH/ESP integrity.
 381          */
 382         if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
 383                 ipsec6stat.in_polvio++;
 384                 goto bad;
 385         }
 386 #endif /* IPSEC */
 387 #ifdef FAST_IPSEC
 388         /*
 389          * Check AH/ESP integrity.
 390          */
 391         if (ipsec6_in_reject(m, in6p)) {
 392                 goto bad;
 393         }
 394 #endif /* FAST_IPSEC */
 395
 396         /*
 397          * Construct sockaddr format source address.
 398          * Stuff source address and datagram in user buffer.
 399          */
 400         init_sin6(&udp_in6, m); /* general init */
 401         udp_in6.sin6_port = uh->uh_sport;
 402         if (in6p->in6p_flags & IN6P_CONTROLOPTS
 403             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
 404                 ip6_savecontrol(in6p, &opts, ip6, m);
 405         m_adj(m, off + sizeof(struct udphdr));
 406         if (sbappendaddr(&in6p->in6p_socket->so_rcv,
 407                         (struct sockaddr *)&udp_in6,
 408                         m, opts) == 0) {
 409                 udpstat.udps_fullsock++;
 410                 goto bad;
 411         }
 412         sorwakeup(in6p->in6p_socket);
 413         return IPPROTO_DONE;
 414 bad:
 415         if (m)
 416                 m_freem(m);
 417         if (opts)
 418                 m_freem(opts);
 419         return IPPROTO_DONE;
 420 }
 421
 422 void
 423 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 424 {
 425         struct udphdr uh;
 426         struct ip6_hdr *ip6;
 427         struct mbuf *m;
 428         int off = 0;
 429         struct ip6ctlparam *ip6cp = NULL;
 430         const struct sockaddr_in6 *sa6_src = NULL;
 431         void (*notify) (struct inpcb *, int) = udp_notify;
 432         struct udp_portonly {
 433                 u_int16_t uh_sport;
 434                 u_int16_t uh_dport;
 435         } *uhp;
 436
 437         if (sa->sa_family != AF_INET6 ||
 438             sa->sa_len != sizeof(struct sockaddr_in6))
 439                 return;
 440
 441         if ((unsigned)cmd >= PRC_NCMDS)
 442                 return;
 443         if (PRC_IS_REDIRECT(cmd))
 444                 notify = in6_rtchange, d = NULL;
 445         else if (cmd == PRC_HOSTDEAD)
 446                 d = NULL;
 447         else if (inet6ctlerrmap[cmd] == 0)
 448                 return;
 449
 450         /* if the parameter is from icmp6, decode it. */
 451         if (d != NULL) {
 452                 ip6cp = (struct ip6ctlparam *)d;
 453                 m = ip6cp->ip6c_m;
 454                 ip6 = ip6cp->ip6c_ip6;
 455                 off = ip6cp->ip6c_off;
 456                 sa6_src = ip6cp->ip6c_src;
 457         } else {
 458                 m = NULL;
 459                 ip6 = NULL;
 460                 sa6_src = &sa6_any;
 461         }
 462
 463         if (ip6) {
 464                 /*
 465                  * XXX: We assume that when IPV6 is non NULL,
 466                  * M and OFF are valid.
 467                  */
 468
 469                 /* check if we can safely examine src and dst ports */
 470                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 471                         return;
 472
 473                 bzero(&uh, sizeof(uh));
 474                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 475
 476                 (void) in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport,
 477                                      (struct sockaddr *)ip6cp->ip6c_src,
 478                                      uh.uh_sport, cmd, notify);
 479         } else
 480                 (void) in6_pcbnotify(&udbinfo.pcblisthead, sa, 0,
 481                                      (const struct sockaddr *)sa6_src,
 482                                      0, cmd, notify);
 483 }
 484
 485 static int
 486 udp6_getcred(SYSCTL_HANDLER_ARGS)
 487 {
 488         struct sockaddr_in6 addrs[2];
 489         struct inpcb *inp;
 490         int error, s;
 491
 492         error = suser(req->td);
 493         if (error)
 494                 return (error);
 495
 496         if (req->newlen != sizeof(addrs))
 497                 return (EINVAL);
 498         if (req->oldlen != sizeof(struct ucred))
 499                 return (EINVAL);
 500         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 501         if (error)
 502                 return (error);
 503         s = splnet();
 504         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
 505                                  addrs[1].sin6_port,
 506                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
 507                                  1, NULL);
 508         if (!inp || !inp->inp_socket) {
 509                 error = ENOENT;
 510                 goto out;
 511         }
 512         error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
 513                            sizeof(struct ucred));
 514
 515 out:
 516         splx(s);
 517         return (error);
 518 }
 519
 520 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 521             0, 0,
 522             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
 523
 524 static int
 525 udp6_abort(struct socket *so)
 526 {
 527         struct inpcb *inp;
 528         int s;
 529
 530         inp = so->so_pcb;
 531         if (inp == 0)
 532                 return EINVAL;  /* ??? possible? panic instead? */
 533         soisdisconnected(so);
 534         s = splnet();
 535         in6_pcbdetach(inp);
 536         splx(s);
 537         return 0;
 538 }
 539
 540 static int
 541 udp6_attach(struct socket *so, int proto, struct pru_attach_info *ai)
 542 {
 543         struct inpcb *inp;
 544         int s, error;
 545
 546         inp = so->so_pcb;
 547         if (inp != 0)
 548                 return EINVAL;
 549
 550         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 551                 error = soreserve(so, udp_sendspace, udp_recvspace,
 552                     ai->sb_rlimit);
 553                 if (error)
 554                         return error;
 555         }
 556         s = splnet();
 557         error = in_pcballoc(so, &udbinfo);
 558         splx(s);
 559         if (error)
 560                 return error;
 561         inp = (struct inpcb *)so->so_pcb;
 562         inp->inp_vflag |= INP_IPV6;
 563         if (!ip6_v6only)
 564                 inp->inp_vflag |= INP_IPV4;
 565         inp->in6p_hops = -1;    /* use kernel default */
 566         inp->in6p_cksum = -1;   /* just to be sure */
 567         /*
 568          * XXX: ugly!!
 569          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 570          * because the socket may be bound to an IPv6 wildcard address,
 571          * which may match an IPv4-mapped IPv6 address.
 572          */
 573         inp->inp_ip_ttl = ip_defttl;
 574         return 0;
 575 }
 576
 577 static int
 578 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 579 {
 580         struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
 581         struct inpcb *inp;
 582         int s, error;
 583
 584         inp = so->so_pcb;
 585         if (inp == 0)
 586                 return EINVAL;
 587
 588         inp->inp_vflag &= ~INP_IPV4;
 589         inp->inp_vflag |= INP_IPV6;
 590         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 591                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 592                         inp->inp_vflag |= INP_IPV4;
 593                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 594                         struct sockaddr_in sin;
 595
 596                         in6_sin6_2_sin(&sin, sin6_p);
 597                         inp->inp_vflag |= INP_IPV4;
 598                         inp->inp_vflag &= ~INP_IPV6;
 599                         s = splnet();
 600                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
 601                         splx(s);
 602                         return error;
 603                 }
 604         }
 605
 606         s = splnet();
 607         error = in6_pcbbind(inp, nam, td);
 608         splx(s);
 609         if (error == 0) {
 610                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 611                         inp->inp_flags |= INP_WASBOUND_NOTANY;
 612                 in_pcbinswildcardhash(inp);
 613         }
 614         return error;
 615 }
 616
 617 static int
 618 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 619 {
 620         struct inpcb *inp;
 621         int s, error;
 622
 623         inp = so->so_pcb;
 624         if (inp == 0)
 625                 return EINVAL;
 626
 627         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 628                 struct sockaddr_in6 *sin6_p;
 629
 630                 sin6_p = (struct sockaddr_in6 *)nam;
 631                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 632                         struct sockaddr_in sin;
 633
 634                         if (inp->inp_faddr.s_addr != INADDR_ANY)
 635                                 return EISCONN;
 636                         in6_sin6_2_sin(&sin, sin6_p);
 637                         s = splnet();
 638                         error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
 639                         splx(s);
 640                         if (error == 0) {
 641                                 inp->inp_vflag |= INP_IPV4;
 642                                 inp->inp_vflag &= ~INP_IPV6;
 643                                 soisconnected(so);
 644                         }
 645                         return error;
 646                 }
 647         }
 648         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 649                 return EISCONN;
 650         if (inp->inp_flags & INP_WILDCARD)
 651                 in_pcbremwildcardhash(inp);
 652         s = splnet();
 653         error = in6_pcbconnect(inp, nam, td);
 654         splx(s);
 655         if (error == 0) {
 656                 if (!ip6_v6only) { /* should be non mapped addr */
 657                         inp->inp_vflag &= ~INP_IPV4;
 658                         inp->inp_vflag |= INP_IPV6;
 659                 }
 660                 soisconnected(so);
 661         } else if (error == EAFNOSUPPORT) {     /* connection dissolved */
 662                 /*
 663                  * Follow traditional BSD behavior and retain
 664                  * the local port binding.  But, fix the old misbehavior
 665                  * of overwriting any previously bound local address.
 666                  */
 667                 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
 668                         inp->in6p_laddr = in6addr_any;
 669                 in_pcbinswildcardhash(inp);
 670         }
 671         return error;
 672 }
 673
 674 static int
 675 udp6_detach(struct socket *so)
 676 {
 677         struct inpcb *inp;
 678         int s;
 679
 680         inp = so->so_pcb;
 681         if (inp == 0)
 682                 return EINVAL;
 683         s = splnet();
 684         in6_pcbdetach(inp);
 685         splx(s);
 686         return 0;
 687 }
 688
 689 static int
 690 udp6_disconnect(struct socket *so)
 691 {
 692         struct inpcb *inp;
 693         int s;
 694
 695         inp = so->so_pcb;
 696         if (inp == 0)
 697                 return EINVAL;
 698
 699         if (inp->inp_vflag & INP_IPV4) {
 700                 const struct pr_usrreqs *pru;
 701
 702                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 703                 return ((*pru->pru_disconnect)(so));
 704         }
 705
 706         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 707                 return ENOTCONN;
 708
 709         s = splnet();
 710         in6_pcbdisconnect(inp);
 711         splx(s);
 712         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 713         return 0;
 714 }
 715
 716 static int
 717 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 718           struct mbuf *control, struct thread *td)
 719 {
 720         struct inpcb *inp;
 721         int error = 0;
 722
 723         inp = so->so_pcb;
 724         if (inp == 0) {
 725                 error = EINVAL;
 726                 goto bad;
 727         }
 728
 729         if (addr) {
 730                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 731                         error = EINVAL;
 732                         goto bad;
 733                 }
 734                 if (addr->sa_family != AF_INET6) {
 735                         error = EAFNOSUPPORT;
 736                         goto bad;
 737                 }
 738         }
 739
 740         if (!ip6_v6only) {
 741                 int hasv4addr;
 742                 struct sockaddr_in6 *sin6 = 0;
 743
 744                 if (addr == 0)
 745                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 746                 else {
 747                         sin6 = (struct sockaddr_in6 *)addr;
 748                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 749                                 ? 1 : 0;
 750                 }
 751                 if (hasv4addr) {
 752                         const struct pr_usrreqs *pru;
 753
 754                         if (sin6)
 755                                 in6_sin6_2_sin_in_sock(addr);
 756                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 757                         error = ((*pru->pru_send)(so, flags, m, addr,
 758                                     control, td));
 759                         /* addr will just be freed in sendit(). */
 760                         return error;
 761                 }
 762         }
 763
 764         return udp6_output(inp, m, addr, control, td);
 765
 766   bad:
 767         m_freem(m);
 768         return(error);
 769 }
 770
 771 struct pr_usrreqs udp6_usrreqs = {
 772         udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
 773         pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
 774         pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
 775         pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
 776         in6_mapped_sockaddr, sosend, soreceive, sopoll
 777 };