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 1.15 2004/06/03 16:21:22 joerg 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(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.listhead, inp_list) {
 232                         if ((in6p->inp_vflag & INP_IPV6) == 0)
 233                                 continue;
 234                         if (in6p->in6p_lport != uh->uh_dport)
 235                                 continue;
 236                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
 237                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
 238                                                         &ip6->ip6_dst) &&
 239                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
 240                                                  m->m_pkthdr.rcvif))
 241                                         continue;
 242                         }
 243                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 244                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
 245                                                         &ip6->ip6_src) ||
 246                                    in6p->in6p_fport != uh->uh_sport)
 247                                         continue;
 248                         }
 249
 250                         if (last != NULL) {
 251                                 struct  mbuf *n;
 252
 253 #ifdef IPSEC
 254                                 /*
 255                                  * Check AH/ESP integrity.
 256                                  */
 257                                 if (ipsec6_in_reject_so(m, last->inp_socket))
 258                                         ipsec6stat.in_polvio++;
 259                                         /* do not inject data into pcb */
 260                                 else
 261 #endif /* IPSEC */
 262 #ifdef FAST_IPSEC
 263                                 /*
 264                                  * Check AH/ESP integrity.
 265                                  */
 266                                 if (ipsec6_in_reject(m, last))
 267                                         ;
 268                                 else
 269 #endif /* FAST_IPSEC */
 270                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 271                                         /*
 272                                          * KAME NOTE: do not
 273                                          * m_copy(m, offset, ...) above.
 274                                          * sbappendaddr() expects M_PKTHDR,
 275                                          * and m_copy() will copy M_PKTHDR
 276                                          * only if offset is 0.
 277                                          */
 278                                         if (last->in6p_flags & IN6P_CONTROLOPTS
 279                                             || last->in6p_socket->so_options & SO_TIMESTAMP)
 280                                                 ip6_savecontrol(last, &opts,
 281                                                                 ip6, n);
 282
 283                                         m_adj(n, off + sizeof(struct udphdr));
 284                                         if (sbappendaddr(&last->in6p_socket->so_rcv,
 285                                                         (struct sockaddr *)&udp_in6,
 286                                                         n, opts) == 0) {
 287                                                 m_freem(n);
 288                                                 if (opts)
 289                                                         m_freem(opts);
 290                                                 udpstat.udps_fullsock++;
 291                                         } else
 292                                                 sorwakeup(last->in6p_socket);
 293                                         opts = NULL;
 294                                 }
 295                         }
 296                         last = in6p;
 297                         /*
 298                          * Don't look for additional matches if this one does
 299                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 300                          * socket options set.  This heuristic avoids searching
 301                          * through all pcbs in the common case of a non-shared
 302                          * port.  It assumes that an application will never
 303                          * clear these options after setting them.
 304                          */
 305                         if ((last->in6p_socket->so_options &
 306                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 307                                 break;
 308                 }
 309
 310                 if (last == NULL) {
 311                         /*
 312                          * No matching pcb found; discard datagram.
 313                          * (No need to send an ICMP Port Unreachable
 314                          * for a broadcast or multicast datgram.)
 315                          */
 316                         udpstat.udps_noport++;
 317                         udpstat.udps_noportmcast++;
 318                         goto bad;
 319                 }
 320 #ifdef IPSEC
 321                 /*
 322                  * Check AH/ESP integrity.
 323                  */
 324                 if (ipsec6_in_reject_so(m, last->inp_socket)) {
 325                         ipsec6stat.in_polvio++;
 326                         goto bad;
 327                 }
 328 #endif /* IPSEC */
 329 #ifdef FAST_IPSEC
 330                 /*
 331                  * Check AH/ESP integrity.
 332                  */
 333                 if (ipsec6_in_reject(m, last)) {
 334                         goto bad;
 335                 }
 336 #endif /* FAST_IPSEC */
 337                 if (last->in6p_flags & IN6P_CONTROLOPTS
 338                     || last->in6p_socket->so_options & SO_TIMESTAMP)
 339                         ip6_savecontrol(last, &opts, ip6, m);
 340
 341                 m_adj(m, off + sizeof(struct udphdr));
 342                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 343                                 (struct sockaddr *)&udp_in6,
 344                                 m, opts) == 0) {
 345                         udpstat.udps_fullsock++;
 346                         goto bad;
 347                 }
 348                 sorwakeup(last->in6p_socket);
 349                 return IPPROTO_DONE;
 350         }
 351         /*
 352          * Locate pcb for datagram.
 353          */
 354         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
 355                                   &ip6->ip6_dst, uh->uh_dport, 1,
 356                                   m->m_pkthdr.rcvif);
 357         if (in6p == 0) {
 358                 if (log_in_vain) {
 359                         char buf[INET6_ADDRSTRLEN];
 360
 361                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
 362                         log(LOG_INFO,
 363                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 364                             buf, ntohs(uh->uh_dport),
 365                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
 366                 }
 367                 udpstat.udps_noport++;
 368                 if (m->m_flags & M_MCAST) {
 369                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
 370                         udpstat.udps_noportmcast++;
 371                         goto bad;
 372                 }
 373                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 374                 return IPPROTO_DONE;
 375         }
 376 #ifdef IPSEC
 377         /*
 378          * Check AH/ESP integrity.
 379          */
 380         if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
 381                 ipsec6stat.in_polvio++;
 382                 goto bad;
 383         }
 384 #endif /* IPSEC */
 385 #ifdef FAST_IPSEC
 386         /*
 387          * Check AH/ESP integrity.
 388          */
 389         if (ipsec6_in_reject(m, in6p)) {
 390                 goto bad;
 391         }
 392 #endif /* FAST_IPSEC */
 393
 394         /*
 395          * Construct sockaddr format source address.
 396          * Stuff source address and datagram in user buffer.
 397          */
 398         init_sin6(&udp_in6, m); /* general init */
 399         udp_in6.sin6_port = uh->uh_sport;
 400         if (in6p->in6p_flags & IN6P_CONTROLOPTS
 401             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
 402                 ip6_savecontrol(in6p, &opts, ip6, m);
 403         m_adj(m, off + sizeof(struct udphdr));
 404         if (sbappendaddr(&in6p->in6p_socket->so_rcv,
 405                         (struct sockaddr *)&udp_in6,
 406                         m, opts) == 0) {
 407                 udpstat.udps_fullsock++;
 408                 goto bad;
 409         }
 410         sorwakeup(in6p->in6p_socket);
 411         return IPPROTO_DONE;
 412 bad:
 413         if (m)
 414                 m_freem(m);
 415         if (opts)
 416                 m_freem(opts);
 417         return IPPROTO_DONE;
 418 }
 419
 420 void
 421 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 422 {
 423         struct udphdr uh;
 424         struct ip6_hdr *ip6;
 425         struct mbuf *m;
 426         int off = 0;
 427         struct ip6ctlparam *ip6cp = NULL;
 428         const struct sockaddr_in6 *sa6_src = NULL;
 429         void (*notify) (struct inpcb *, int) = udp_notify;
 430         struct udp_portonly {
 431                 u_int16_t uh_sport;
 432                 u_int16_t uh_dport;
 433         } *uhp;
 434
 435         if (sa->sa_family != AF_INET6 ||
 436             sa->sa_len != sizeof(struct sockaddr_in6))
 437                 return;
 438
 439         if ((unsigned)cmd >= PRC_NCMDS)
 440                 return;
 441         if (PRC_IS_REDIRECT(cmd))
 442                 notify = in6_rtchange, d = NULL;
 443         else if (cmd == PRC_HOSTDEAD)
 444                 d = NULL;
 445         else if (inet6ctlerrmap[cmd] == 0)
 446                 return;
 447
 448         /* if the parameter is from icmp6, decode it. */
 449         if (d != NULL) {
 450                 ip6cp = (struct ip6ctlparam *)d;
 451                 m = ip6cp->ip6c_m;
 452                 ip6 = ip6cp->ip6c_ip6;
 453                 off = ip6cp->ip6c_off;
 454                 sa6_src = ip6cp->ip6c_src;
 455         } else {
 456                 m = NULL;
 457                 ip6 = NULL;
 458                 sa6_src = &sa6_any;
 459         }
 460
 461         if (ip6) {
 462                 /*
 463                  * XXX: We assume that when IPV6 is non NULL,
 464                  * M and OFF are valid.
 465                  */
 466
 467                 /* check if we can safely examine src and dst ports */
 468                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 469                         return;
 470
 471                 bzero(&uh, sizeof(uh));
 472                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 473
 474                 (void) in6_pcbnotify(&udbinfo.listhead, sa, uh.uh_dport,
 475                                      (struct sockaddr *)ip6cp->ip6c_src,
 476                                      uh.uh_sport, cmd, notify);
 477         } else
 478                 (void) in6_pcbnotify(&udbinfo.listhead, sa, 0,
 479                                      (const struct sockaddr *)sa6_src,
 480                                      0, cmd, notify);
 481 }
 482
 483 static int
 484 udp6_getcred(SYSCTL_HANDLER_ARGS)
 485 {
 486         struct sockaddr_in6 addrs[2];
 487         struct inpcb *inp;
 488         int error, s;
 489
 490         error = suser(req->td);
 491         if (error)
 492                 return (error);
 493
 494         if (req->newlen != sizeof(addrs))
 495                 return (EINVAL);
 496         if (req->oldlen != sizeof(struct ucred))
 497                 return (EINVAL);
 498         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 499         if (error)
 500                 return (error);
 501         s = splnet();
 502         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
 503                                  addrs[1].sin6_port,
 504                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
 505                                  1, NULL);
 506         if (!inp || !inp->inp_socket) {
 507                 error = ENOENT;
 508                 goto out;
 509         }
 510         error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
 511                            sizeof(struct ucred));
 512
 513 out:
 514         splx(s);
 515         return (error);
 516 }
 517
 518 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 519             0, 0,
 520             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
 521
 522 static int
 523 udp6_abort(struct socket *so)
 524 {
 525         struct inpcb *inp;
 526         int s;
 527
 528         inp = sotoinpcb(so);
 529         if (inp == 0)
 530                 return EINVAL;  /* ??? possible? panic instead? */
 531         soisdisconnected(so);
 532         s = splnet();
 533         in6_pcbdetach(inp);
 534         splx(s);
 535         return 0;
 536 }
 537
 538 static int
 539 udp6_attach(struct socket *so, int proto, struct pru_attach_info *ai)
 540 {
 541         struct inpcb *inp;
 542         int s, error;
 543
 544         inp = sotoinpcb(so);
 545         if (inp != 0)
 546                 return EINVAL;
 547
 548         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 549                 error = soreserve(so, udp_sendspace, udp_recvspace,
 550                     ai->sb_rlimit);
 551                 if (error)
 552                         return error;
 553         }
 554         s = splnet();
 555         error = in_pcballoc(so, &udbinfo);
 556         splx(s);
 557         if (error)
 558                 return error;
 559         inp = (struct inpcb *)so->so_pcb;
 560         inp->inp_vflag |= INP_IPV6;
 561         if (!ip6_v6only)
 562                 inp->inp_vflag |= INP_IPV4;
 563         inp->in6p_hops = -1;    /* use kernel default */
 564         inp->in6p_cksum = -1;   /* just to be sure */
 565         /*
 566          * XXX: ugly!!
 567          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 568          * because the socket may be bound to an IPv6 wildcard address,
 569          * which may match an IPv4-mapped IPv6 address.
 570          */
 571         inp->inp_ip_ttl = ip_defttl;
 572         return 0;
 573 }
 574
 575 static int
 576 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 577 {
 578         struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
 579         struct inpcb *inp;
 580         int s, error;
 581
 582         inp = sotoinpcb(so);
 583         if (inp == 0)
 584                 return EINVAL;
 585
 586         inp->inp_vflag &= ~INP_IPV4;
 587         inp->inp_vflag |= INP_IPV6;
 588         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 589                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 590                         inp->inp_vflag |= INP_IPV4;
 591                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 592                         struct sockaddr_in sin;
 593
 594                         in6_sin6_2_sin(&sin, sin6_p);
 595                         inp->inp_vflag |= INP_IPV4;
 596                         inp->inp_vflag &= ~INP_IPV6;
 597                         s = splnet();
 598                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
 599                         splx(s);
 600                         return error;
 601                 }
 602         }
 603
 604         s = splnet();
 605         error = in6_pcbbind(inp, nam, td);
 606         splx(s);
 607         if (error == 0) {
 608                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 609                         inp->inp_flags |= INP_WASBOUND_NOTANY;
 610                 in_pcbinswildcardhash(inp);
 611         }
 612         return error;
 613 }
 614
 615 static int
 616 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 617 {
 618         struct inpcb *inp;
 619         int s, error;
 620
 621         inp = sotoinpcb(so);
 622         if (inp == 0)
 623                 return EINVAL;
 624
 625         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 626                 struct sockaddr_in6 *sin6_p;
 627
 628                 sin6_p = (struct sockaddr_in6 *)nam;
 629                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 630                         struct sockaddr_in sin;
 631
 632                         if (inp->inp_faddr.s_addr != INADDR_ANY)
 633                                 return EISCONN;
 634                         in6_sin6_2_sin(&sin, sin6_p);
 635                         s = splnet();
 636                         error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
 637                         splx(s);
 638                         if (error == 0) {
 639                                 inp->inp_vflag |= INP_IPV4;
 640                                 inp->inp_vflag &= ~INP_IPV6;
 641                                 soisconnected(so);
 642                         }
 643                         return error;
 644                 }
 645         }
 646         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 647                 return EISCONN;
 648         if (inp->inp_flags & INP_WILDCARD)
 649                 in_pcbremwildcardhash(inp);
 650         s = splnet();
 651         error = in6_pcbconnect(inp, nam, td);
 652         splx(s);
 653         if (error == 0) {
 654                 if (!ip6_v6only) { /* should be non mapped addr */
 655                         inp->inp_vflag &= ~INP_IPV4;
 656                         inp->inp_vflag |= INP_IPV6;
 657                 }
 658                 soisconnected(so);
 659         } else if (error == EAFNOSUPPORT) {     /* connection dissolved */
 660                 /*
 661                  * Follow traditional BSD behavior and retain
 662                  * the local port binding.  But, fix the old misbehavior
 663                  * of overwriting any previously bound local address.
 664                  */
 665                 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
 666                         inp->in6p_laddr = in6addr_any;
 667                 in_pcbinswildcardhash(inp);
 668         }
 669         return error;
 670 }
 671
 672 static int
 673 udp6_detach(struct socket *so)
 674 {
 675         struct inpcb *inp;
 676         int s;
 677
 678         inp = sotoinpcb(so);
 679         if (inp == 0)
 680                 return EINVAL;
 681         s = splnet();
 682         in6_pcbdetach(inp);
 683         splx(s);
 684         return 0;
 685 }
 686
 687 static int
 688 udp6_disconnect(struct socket *so)
 689 {
 690         struct inpcb *inp;
 691         int s;
 692
 693         inp = sotoinpcb(so);
 694         if (inp == 0)
 695                 return EINVAL;
 696
 697         if (inp->inp_vflag & INP_IPV4) {
 698                 const struct pr_usrreqs *pru;
 699
 700                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 701                 return ((*pru->pru_disconnect)(so));
 702         }
 703
 704         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 705                 return ENOTCONN;
 706
 707         s = splnet();
 708         in6_pcbdisconnect(inp);
 709         splx(s);
 710         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 711         return 0;
 712 }
 713
 714 static int
 715 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 716           struct mbuf *control, struct thread *td)
 717 {
 718         struct inpcb *inp;
 719         int error = 0;
 720
 721         inp = sotoinpcb(so);
 722         if (inp == 0) {
 723                 error = EINVAL;
 724                 goto bad;
 725         }
 726
 727         if (addr) {
 728                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 729                         error = EINVAL;
 730                         goto bad;
 731                 }
 732                 if (addr->sa_family != AF_INET6) {
 733                         error = EAFNOSUPPORT;
 734                         goto bad;
 735                 }
 736         }
 737
 738         if (!ip6_v6only) {
 739                 int hasv4addr;
 740                 struct sockaddr_in6 *sin6 = 0;
 741
 742                 if (addr == 0)
 743                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 744                 else {
 745                         sin6 = (struct sockaddr_in6 *)addr;
 746                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 747                                 ? 1 : 0;
 748                 }
 749                 if (hasv4addr) {
 750                         const struct pr_usrreqs *pru;
 751
 752                         if (sin6)
 753                                 in6_sin6_2_sin_in_sock(addr);
 754                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 755                         error = ((*pru->pru_send)(so, flags, m, addr,
 756                                     control, td));
 757                         /* addr will just be freed in sendit(). */
 758                         return error;
 759                 }
 760         }
 761
 762         return udp6_output(inp, m, addr, control, td);
 763
 764   bad:
 765         m_freem(m);
 766         return(error);
 767 }
 768
 769 struct pr_usrreqs udp6_usrreqs = {
 770         udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
 771         pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
 772         pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
 773         pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
 774         in6_mapped_sockaddr, sosend, soreceive, sopoll
 775 };