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 1.2 2003/06/17 04:28:53 dillon 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 <netipsec/ipsec.h>
 112 #include <netipsec/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 __P((struct inpcb *, struct in6_addr *, struct ifnet *));
 122 static  int udp6_detach __P((struct socket *so));
 123
 124 static int
 125 in6_mcmatch(in6p, ia6, ifp)
 126         struct inpcb *in6p;
 127         register 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(mp, offp, proto)
 149         struct mbuf **mp;
 150         int *offp, proto;
 151 {
 152         struct mbuf *m = *mp;
 153         register struct ip6_hdr *ip6;
 154         register struct udphdr *uh;
 155         register struct inpcb *in6p;
 156         struct  mbuf *opts = NULL;
 157         int off = *offp;
 158         int plen, ulen;
 159         struct sockaddr_in6 udp_in6;
 160
 161         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
 162
 163         ip6 = mtod(m, struct ip6_hdr *);
 164
 165         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
 166                 /* XXX send icmp6 host/port unreach? */
 167                 m_freem(m);
 168                 return IPPROTO_DONE;
 169         }
 170
 171         udpstat.udps_ipackets++;
 172
 173         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 174         uh = (struct udphdr *)((caddr_t)ip6 + off);
 175         ulen = ntohs((u_short)uh->uh_ulen);
 176
 177         if (plen != ulen) {
 178                 udpstat.udps_badlen++;
 179                 goto bad;
 180         }
 181
 182         /*
 183          * Checksum extended UDP header and data.
 184          */
 185         if (uh->uh_sum == 0)
 186                 udpstat.udps_nosum++;
 187         else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
 188                 udpstat.udps_badsum++;
 189                 goto bad;
 190         }
 191
 192         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 193                 struct  inpcb *last;
 194
 195                 /*
 196                  * Deliver a multicast datagram to all sockets
 197                  * for which the local and remote addresses and ports match
 198                  * those of the incoming datagram.  This allows more than
 199                  * one process to receive multicasts on the same port.
 200                  * (This really ought to be done for unicast datagrams as
 201                  * well, but that would cause problems with existing
 202                  * applications that open both address-specific sockets and
 203                  * a wildcard socket listening to the same port -- they would
 204                  * end up receiving duplicates of every unicast datagram.
 205                  * Those applications open the multiple sockets to overcome an
 206                  * inadequacy of the UDP socket interface, but for backwards
 207                  * compatibility we avoid the problem here rather than
 208                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 209                  */
 210
 211                 /*
 212                  * In a case that laddr should be set to the link-local
 213                  * address (this happens in RIPng), the multicast address
 214                  * specified in the received packet does not match with
 215                  * laddr. To cure this situation, the matching is relaxed
 216                  * if the receiving interface is the same as one specified
 217                  * in the socket and if the destination multicast address
 218                  * matches one of the multicast groups specified in the socket.
 219                  */
 220
 221                 /*
 222                  * Construct sockaddr format source address.
 223                  */
 224                 init_sin6(&udp_in6, m); /* general init */
 225                 udp_in6.sin6_port = uh->uh_sport;
 226                 /*
 227                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
 228                  * We need udphdr for IPsec processing so we do that later.
 229                  */
 230
 231                 /*
 232                  * Locate pcb(s) for datagram.
 233                  * (Algorithm copied from raw_intr().)
 234                  */
 235                 last = NULL;
 236                 LIST_FOREACH(in6p, &udb, inp_list) {
 237                         if ((in6p->inp_vflag & INP_IPV6) == 0)
 238                                 continue;
 239                         if (in6p->in6p_lport != uh->uh_dport)
 240                                 continue;
 241                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
 242                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
 243                                                         &ip6->ip6_dst) &&
 244                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
 245                                                  m->m_pkthdr.rcvif))
 246                                         continue;
 247                         }
 248                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 249                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
 250                                                         &ip6->ip6_src) ||
 251                                    in6p->in6p_fport != uh->uh_sport)
 252                                         continue;
 253                         }
 254
 255                         if (last != NULL) {
 256                                 struct  mbuf *n;
 257
 258 #ifdef IPSEC
 259                                 /*
 260                                  * Check AH/ESP integrity.
 261                                  */
 262                                 if (ipsec6_in_reject_so(m, last->inp_socket))
 263                                         ipsec6stat.in_polvio++;
 264                                         /* do not inject data into pcb */
 265                                 else
 266 #endif /* IPSEC */
 267 #ifdef FAST_IPSEC
 268                                 /*
 269                                  * Check AH/ESP integrity.
 270                                  */
 271                                 if (ipsec6_in_reject(m, last))
 272                                         ;
 273                                 else
 274 #endif /* FAST_IPSEC */
 275                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 276                                         /*
 277                                          * KAME NOTE: do not
 278                                          * m_copy(m, offset, ...) above.
 279                                          * sbappendaddr() expects M_PKTHDR,
 280                                          * and m_copy() will copy M_PKTHDR
 281                                          * only if offset is 0.
 282                                          */
 283                                         if (last->in6p_flags & IN6P_CONTROLOPTS
 284                                             || last->in6p_socket->so_options & SO_TIMESTAMP)
 285                                                 ip6_savecontrol(last, &opts,
 286                                                                 ip6, n);
 287
 288                                         m_adj(n, off + sizeof(struct udphdr));
 289                                         if (sbappendaddr(&last->in6p_socket->so_rcv,
 290                                                         (struct sockaddr *)&udp_in6,
 291                                                         n, opts) == 0) {
 292                                                 m_freem(n);
 293                                                 if (opts)
 294                                                         m_freem(opts);
 295                                                 udpstat.udps_fullsock++;
 296                                         } else
 297                                                 sorwakeup(last->in6p_socket);
 298                                         opts = NULL;
 299                                 }
 300                         }
 301                         last = in6p;
 302                         /*
 303                          * Don't look for additional matches if this one does
 304                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 305                          * socket options set.  This heuristic avoids searching
 306                          * through all pcbs in the common case of a non-shared
 307                          * port.  It assumes that an application will never
 308                          * clear these options after setting them.
 309                          */
 310                         if ((last->in6p_socket->so_options &
 311                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 312                                 break;
 313                 }
 314
 315                 if (last == NULL) {
 316                         /*
 317                          * No matching pcb found; discard datagram.
 318                          * (No need to send an ICMP Port Unreachable
 319                          * for a broadcast or multicast datgram.)
 320                          */
 321                         udpstat.udps_noport++;
 322                         udpstat.udps_noportmcast++;
 323                         goto bad;
 324                 }
 325 #ifdef IPSEC
 326                 /*
 327                  * Check AH/ESP integrity.
 328                  */
 329                 if (ipsec6_in_reject_so(m, last->inp_socket)) {
 330                         ipsec6stat.in_polvio++;
 331                         goto bad;
 332                 }
 333 #endif /* IPSEC */
 334 #ifdef FAST_IPSEC
 335                 /*
 336                  * Check AH/ESP integrity.
 337                  */
 338                 if (ipsec6_in_reject(m, last)) {
 339                         goto bad;
 340                 }
 341 #endif /* FAST_IPSEC */
 342                 if (last->in6p_flags & IN6P_CONTROLOPTS
 343                     || last->in6p_socket->so_options & SO_TIMESTAMP)
 344                         ip6_savecontrol(last, &opts, ip6, m);
 345
 346                 m_adj(m, off + sizeof(struct udphdr));
 347                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 348                                 (struct sockaddr *)&udp_in6,
 349                                 m, opts) == 0) {
 350                         udpstat.udps_fullsock++;
 351                         goto bad;
 352                 }
 353                 sorwakeup(last->in6p_socket);
 354                 return IPPROTO_DONE;
 355         }
 356         /*
 357          * Locate pcb for datagram.
 358          */
 359         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
 360                                   &ip6->ip6_dst, uh->uh_dport, 1,
 361                                   m->m_pkthdr.rcvif);
 362         if (in6p == 0) {
 363                 if (log_in_vain) {
 364                         char buf[INET6_ADDRSTRLEN];
 365
 366                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
 367                         log(LOG_INFO,
 368                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 369                             buf, ntohs(uh->uh_dport),
 370                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
 371                 }
 372                 udpstat.udps_noport++;
 373                 if (m->m_flags & M_MCAST) {
 374                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
 375                         udpstat.udps_noportmcast++;
 376                         goto bad;
 377                 }
 378                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 379                 return IPPROTO_DONE;
 380         }
 381 #ifdef IPSEC
 382         /*
 383          * Check AH/ESP integrity.
 384          */
 385         if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
 386                 ipsec6stat.in_polvio++;
 387                 goto bad;
 388         }
 389 #endif /* IPSEC */
 390 #ifdef FAST_IPSEC
 391         /*
 392          * Check AH/ESP integrity.
 393          */
 394         if (ipsec6_in_reject(m, in6p)) {
 395                 goto bad;
 396         }
 397 #endif /* FAST_IPSEC */
 398
 399         /*
 400          * Construct sockaddr format source address.
 401          * Stuff source address and datagram in user buffer.
 402          */
 403         init_sin6(&udp_in6, m); /* general init */
 404         udp_in6.sin6_port = uh->uh_sport;
 405         if (in6p->in6p_flags & IN6P_CONTROLOPTS
 406             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
 407                 ip6_savecontrol(in6p, &opts, ip6, m);
 408         m_adj(m, off + sizeof(struct udphdr));
 409         if (sbappendaddr(&in6p->in6p_socket->so_rcv,
 410                         (struct sockaddr *)&udp_in6,
 411                         m, opts) == 0) {
 412                 udpstat.udps_fullsock++;
 413                 goto bad;
 414         }
 415         sorwakeup(in6p->in6p_socket);
 416         return IPPROTO_DONE;
 417 bad:
 418         if (m)
 419                 m_freem(m);
 420         if (opts)
 421                 m_freem(opts);
 422         return IPPROTO_DONE;
 423 }
 424
 425 void
 426 udp6_ctlinput(cmd, sa, d)
 427         int cmd;
 428         struct sockaddr *sa;
 429         void *d;
 430 {
 431         struct udphdr uh;
 432         struct ip6_hdr *ip6;
 433         struct mbuf *m;
 434         int off = 0;
 435         struct ip6ctlparam *ip6cp = NULL;
 436         const struct sockaddr_in6 *sa6_src = NULL;
 437         void (*notify) __P((struct inpcb *, int)) = udp_notify;
 438         struct udp_portonly {
 439                 u_int16_t uh_sport;
 440                 u_int16_t uh_dport;
 441         } *uhp;
 442
 443         if (sa->sa_family != AF_INET6 ||
 444             sa->sa_len != sizeof(struct sockaddr_in6))
 445                 return;
 446
 447         if ((unsigned)cmd >= PRC_NCMDS)
 448                 return;
 449         if (PRC_IS_REDIRECT(cmd))
 450                 notify = in6_rtchange, d = NULL;
 451         else if (cmd == PRC_HOSTDEAD)
 452                 d = NULL;
 453         else if (inet6ctlerrmap[cmd] == 0)
 454                 return;
 455
 456         /* if the parameter is from icmp6, decode it. */
 457         if (d != NULL) {
 458                 ip6cp = (struct ip6ctlparam *)d;
 459                 m = ip6cp->ip6c_m;
 460                 ip6 = ip6cp->ip6c_ip6;
 461                 off = ip6cp->ip6c_off;
 462                 sa6_src = ip6cp->ip6c_src;
 463         } else {
 464                 m = NULL;
 465                 ip6 = NULL;
 466                 sa6_src = &sa6_any;
 467         }
 468
 469         if (ip6) {
 470                 /*
 471                  * XXX: We assume that when IPV6 is non NULL,
 472                  * M and OFF are valid.
 473                  */
 474
 475                 /* check if we can safely examine src and dst ports */
 476                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 477                         return;
 478
 479                 bzero(&uh, sizeof(uh));
 480                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 481
 482                 (void) in6_pcbnotify(&udb, sa, uh.uh_dport,
 483                                      (struct sockaddr *)ip6cp->ip6c_src,
 484                                      uh.uh_sport, cmd, notify);
 485         } else
 486                 (void) in6_pcbnotify(&udb, sa, 0, (struct sockaddr *)sa6_src,
 487                                      0, cmd, notify);
 488 }
 489
 490 static int
 491 udp6_getcred(SYSCTL_HANDLER_ARGS)
 492 {
 493         struct sockaddr_in6 addrs[2];
 494         struct inpcb *inp;
 495         int error, s;
 496
 497         error = suser(req->p);
 498         if (error)
 499                 return (error);
 500
 501         if (req->newlen != sizeof(addrs))
 502                 return (EINVAL);
 503         if (req->oldlen != sizeof(struct ucred))
 504                 return (EINVAL);
 505         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 506         if (error)
 507                 return (error);
 508         s = splnet();
 509         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
 510                                  addrs[1].sin6_port,
 511                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
 512                                  1, NULL);
 513         if (!inp || !inp->inp_socket) {
 514                 error = ENOENT;
 515                 goto out;
 516         }
 517         error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
 518                            sizeof(struct ucred));
 519
 520 out:
 521         splx(s);
 522         return (error);
 523 }
 524
 525 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 526             0, 0,
 527             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
 528
 529 static int
 530 udp6_abort(struct socket *so)
 531 {
 532         struct inpcb *inp;
 533         int s;
 534
 535         inp = sotoinpcb(so);
 536         if (inp == 0)
 537                 return EINVAL;  /* ??? possible? panic instead? */
 538         soisdisconnected(so);
 539         s = splnet();
 540         in6_pcbdetach(inp);
 541         splx(s);
 542         return 0;
 543 }
 544
 545 static int
 546 udp6_attach(struct socket *so, int proto, struct proc *p)
 547 {
 548         struct inpcb *inp;
 549         int s, error;
 550
 551         inp = sotoinpcb(so);
 552         if (inp != 0)
 553                 return EINVAL;
 554
 555         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 556                 error = soreserve(so, udp_sendspace, udp_recvspace);
 557                 if (error)
 558                         return error;
 559         }
 560         s = splnet();
 561         error = in_pcballoc(so, &udbinfo, p);
 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 proc *p)
 583 {
 584         struct inpcb *inp;
 585         int s, error;
 586
 587         inp = sotoinpcb(so);
 588         if (inp == 0)
 589                 return EINVAL;
 590
 591         inp->inp_vflag &= ~INP_IPV4;
 592         inp->inp_vflag |= INP_IPV6;
 593         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 594                 struct sockaddr_in6 *sin6_p;
 595
 596                 sin6_p = (struct sockaddr_in6 *)nam;
 597
 598                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 599                         inp->inp_vflag |= INP_IPV4;
 600                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 601                         struct sockaddr_in sin;
 602
 603                         in6_sin6_2_sin(&sin, sin6_p);
 604                         inp->inp_vflag |= INP_IPV4;
 605                         inp->inp_vflag &= ~INP_IPV6;
 606                         s = splnet();
 607                         error = in_pcbbind(inp, (struct sockaddr *)&sin, p);
 608                         splx(s);
 609                         return error;
 610                 }
 611         }
 612
 613         s = splnet();
 614         error = in6_pcbbind(inp, nam, p);
 615         splx(s);
 616         return error;
 617 }
 618
 619 static int
 620 udp6_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
 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, p);
 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         s = splnet();
 653         error = in6_pcbconnect(inp, nam, p);
 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         }
 662         return error;
 663 }
 664
 665 static int
 666 udp6_detach(struct socket *so)
 667 {
 668         struct inpcb *inp;
 669         int s;
 670
 671         inp = sotoinpcb(so);
 672         if (inp == 0)
 673                 return EINVAL;
 674         s = splnet();
 675         in6_pcbdetach(inp);
 676         splx(s);
 677         return 0;
 678 }
 679
 680 static int
 681 udp6_disconnect(struct socket *so)
 682 {
 683         struct inpcb *inp;
 684         int s;
 685
 686         inp = sotoinpcb(so);
 687         if (inp == 0)
 688                 return EINVAL;
 689
 690         if (inp->inp_vflag & INP_IPV4) {
 691                 struct pr_usrreqs *pru;
 692
 693                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 694                 return ((*pru->pru_disconnect)(so));
 695         }
 696
 697         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 698                 return ENOTCONN;
 699
 700         s = splnet();
 701         in6_pcbdisconnect(inp);
 702         inp->in6p_laddr = in6addr_any;
 703         splx(s);
 704         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 705         return 0;
 706 }
 707
 708 static int
 709 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 710           struct mbuf *control, struct proc *p)
 711 {
 712         struct inpcb *inp;
 713         int error = 0;
 714
 715         inp = sotoinpcb(so);
 716         if (inp == 0) {
 717                 error = EINVAL;
 718                 goto bad;
 719         }
 720
 721         if (addr) {
 722                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 723                         error = EINVAL;
 724                         goto bad;
 725                 }
 726                 if (addr->sa_family != AF_INET6) {
 727                         error = EAFNOSUPPORT;
 728                         goto bad;
 729                 }
 730         }
 731
 732         if (!ip6_v6only) {
 733                 int hasv4addr;
 734                 struct sockaddr_in6 *sin6 = 0;
 735
 736                 if (addr == 0)
 737                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 738                 else {
 739                         sin6 = (struct sockaddr_in6 *)addr;
 740                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 741                                 ? 1 : 0;
 742                 }
 743                 if (hasv4addr) {
 744                         struct pr_usrreqs *pru;
 745
 746                         if (sin6)
 747                                 in6_sin6_2_sin_in_sock(addr);
 748                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 749                         error = ((*pru->pru_send)(so, flags, m, addr, control,
 750                                                   p));
 751                         /* addr will just be freed in sendit(). */
 752                         return error;
 753                 }
 754         }
 755
 756         return udp6_output(inp, m, addr, control, p);
 757
 758   bad:
 759         m_freem(m);
 760         return(error);
 761 }
 762
 763 struct pr_usrreqs udp6_usrreqs = {
 764         udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
 765         pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
 766         pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
 767         pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
 768         in6_mapped_sockaddr, sosend, soreceive, sopoll
 769 };