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