bsd/netinet6/udp6_usrreq.c

   1 /*      $FreeBSD: src/sys/netinet6/udp6_usrreq.c,v 1.6.2.6 2001/07/29 19:32:40 ume 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 <sys/param.h>
  69 #include <sys/kernel.h>
  70 #include <sys/malloc.h>
  71 #include <sys/mbuf.h>
  72 #include <sys/protosw.h>
  73 #include <sys/socket.h>
  74 #include <sys/socketvar.h>
  75 #include <sys/sysctl.h>
  76 #include <sys/errno.h>
  77 #include <sys/stat.h>
  78 #include <sys/systm.h>
  79 #include <sys/syslog.h>
  80 #include <sys/proc.h>
  81 #include <sys/kauth.h>
  82
  83 #include <net/if.h>
  84 #include <net/route.h>
  85 #include <net/if_types.h>
  86
  87 #include <netinet/in.h>
  88 #include <netinet/in_systm.h>
  89 #include <netinet/ip.h>
  90 #include <netinet/in_pcb.h>
  91 #include <netinet/in_var.h>
  92 #include <netinet/ip_var.h>
  93 #include <netinet/udp.h>
  94 #include <netinet/udp_var.h>
  95 #include <netinet/ip6.h>
  96 #include <netinet6/ip6_var.h>
  97 #include <netinet6/in6_pcb.h>
  98 #include <netinet/icmp6.h>
  99 #include <netinet6/udp6_var.h>
 100 #include <netinet6/ip6protosw.h>
 101
 102 #if IPSEC
 103 #include <netinet6/ipsec.h>
 104 #include <netinet6/ipsec6.h>
 105 extern int ipsec_bypass;
 106 #endif /*IPSEC*/
 107 extern lck_mtx_t *nd6_mutex;
 108
 109 /*
 110  * UDP protocol inplementation.
 111  * Per RFC 768, August, 1980.
 112  */
 113
 114 extern  struct protosw inetsw[];
 115 static  int in6_mcmatch(struct inpcb *, struct in6_addr *, struct ifnet *);
 116 static  int udp6_detach(struct socket *so);
 117 static void udp6_append(struct inpcb *, struct ip6_hdr *,
 118     struct sockaddr_in6 *, struct mbuf *, int);
 119
 120 extern  void    ipfwsyslog( int level, const char *format,...);
 121 extern int fw_verbose;
 122
 123 #if IPFIREWALL
 124 #define log_in_vain_log( a ) {            \
 125         if ( (log_in_vain == 3 ) && (fw_verbose == 2)) {        /* Apple logging, log to ipfw.log */ \
 126                 ipfwsyslog a ;  \
 127         }                       \
 128         else log a ;            \
 129 }
 130 #else
 131 #define log_in_vain_log( a ) { log a; }
 132 #endif
 133
 134 static int
 135 in6_mcmatch(
 136         struct inpcb *in6p,
 137         register struct in6_addr *ia6,
 138         struct ifnet *ifp)
 139 {
 140         struct ip6_moptions *im6o = in6p->in6p_moptions;
 141         struct in6_multi_mship *imm;
 142
 143         if (im6o == NULL)
 144                 return 0;
 145
 146         lck_mtx_lock(nd6_mutex);
 147         for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
 148              imm = imm->i6mm_chain.le_next) {
 149                 if ((ifp == NULL ||
 150                      imm->i6mm_maddr->in6m_ifp == ifp) &&
 151                     IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
 152                                        ia6)) {
 153                         lck_mtx_unlock(nd6_mutex);
 154                         return 1;
 155                 }
 156         }
 157         lck_mtx_unlock(nd6_mutex);
 158         return 0;
 159 }
 160
 161 /*
 162  * subroutine of udp6_input(), mainly for source code readability.
 163  */
 164 static void
 165 udp6_append(struct inpcb *last, struct ip6_hdr *ip6,
 166     struct sockaddr_in6 *udp_in6, struct mbuf *n, int off)
 167 {
 168         struct  mbuf *opts = NULL;
 169
 170 #if CONFIG_MACF_NET
 171         if (mac_inpcb_check_deliver(last, n, AF_INET6, SOCK_DGRAM) != 0) {
 172                 m_freem(n);
 173                 return;
 174         }
 175 #endif
 176         if (last->in6p_flags & IN6P_CONTROLOPTS ||
 177             last->in6p_socket->so_options & SO_TIMESTAMP)
 178                 ip6_savecontrol(last, &opts, ip6, n);
 179
 180         m_adj(n, off);
 181         if (sbappendaddr(&last->in6p_socket->so_rcv,
 182             (struct sockaddr *)udp_in6, n, opts, NULL) == 0)
 183                 udpstat.udps_fullsock++;
 184         else
 185                 sorwakeup(last->in6p_socket);
 186 }
 187
 188 int
 189 udp6_input(
 190         struct mbuf **mp,
 191         int *offp)
 192 {
 193         struct mbuf *m = *mp;
 194         register struct ip6_hdr *ip6;
 195         register struct udphdr *uh;
 196         register struct inpcb *in6p;
 197         struct  mbuf *opts = NULL;
 198         int off = *offp;
 199         int plen, ulen;
 200         struct sockaddr_in6 udp_in6;
 201         struct inpcbinfo *pcbinfo = &udbinfo;
 202
 203         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), return IPPROTO_DONE);
 204
 205         ip6 = mtod(m, struct ip6_hdr *);
 206
 207 #if defined(NFAITH) && 0 < NFAITH
 208         if (faithprefix(&ip6->ip6_dst)) {
 209                 /* XXX send icmp6 host/port unreach? */
 210                 m_freem(m);
 211                 return IPPROTO_DONE;
 212         }
 213 #endif
 214
 215         udpstat.udps_ipackets++;
 216
 217         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 218         uh = (struct udphdr *)((caddr_t)ip6 + off);
 219         ulen = ntohs((u_short)uh->uh_ulen);
 220
 221         if (plen != ulen) {
 222                 udpstat.udps_badlen++;
 223                 goto bad;
 224         }
 225
 226         /*
 227          * Checksum extended UDP header and data.
 228          */
 229 #ifndef __APPLE__
 230         if (uh->uh_sum == 0)
 231                 udpstat.udps_nosum++;
 232 #endif
 233         else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
 234                 udpstat.udps_badsum++;
 235                 goto bad;
 236         }
 237
 238         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 239                 int reuse_sock = 0, mcast_delivered = 0;
 240                 struct mbuf *n = NULL;
 241
 242                 /*
 243                  * Deliver a multicast datagram to all sockets
 244                  * for which the local and remote addresses and ports match
 245                  * those of the incoming datagram.  This allows more than
 246                  * one process to receive multicasts on the same port.
 247                  * (This really ought to be done for unicast datagrams as
 248                  * well, but that would cause problems with existing
 249                  * applications that open both address-specific sockets and
 250                  * a wildcard socket listening to the same port -- they would
 251                  * end up receiving duplicates of every unicast datagram.
 252                  * Those applications open the multiple sockets to overcome an
 253                  * inadequacy of the UDP socket interface, but for backwards
 254                  * compatibility we avoid the problem here rather than
 255                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 256                  */
 257
 258                 /*
 259                  * In a case that laddr should be set to the link-local
 260                  * address (this happens in RIPng), the multicast address
 261                  * specified in the received packet does not match with
 262                  * laddr. To cure this situation, the matching is relaxed
 263                  * if the receiving interface is the same as one specified
 264                  * in the socket and if the destination multicast address
 265                  * matches one of the multicast groups specified in the socket.
 266                  */
 267
 268                 /*
 269                  * Construct sockaddr format source address.
 270                  */
 271                 init_sin6(&udp_in6, m); /* general init */
 272                 udp_in6.sin6_port = uh->uh_sport;
 273                 /*
 274                  * KAME note: usually we drop udphdr from mbuf here.
 275                  * We need udphdr for IPsec processing so we do that later.
 276                  */
 277
 278                 /*
 279                  * Locate pcb(s) for datagram.
 280                  * (Algorithm copied from raw_intr().)
 281                  */
 282                 lck_rw_lock_shared(pcbinfo->mtx);
 283
 284                 LIST_FOREACH(in6p, &udb, inp_list) {
 285
 286                         if ((in6p->inp_vflag & INP_IPV6) == 0)
 287                                 continue;
 288
 289                         if (in_pcb_checkstate(in6p, WNT_ACQUIRE, 0) == WNT_STOPUSING)
 290                                 continue;
 291
 292                         udp_lock(in6p->in6p_socket, 1, 0);
 293
 294                         if (in_pcb_checkstate(in6p, WNT_RELEASE, 1) == WNT_STOPUSING) {
 295                                 udp_unlock(in6p->in6p_socket, 1, 0);
 296                                 continue;
 297                         }
 298                         if (in6p->in6p_lport != uh->uh_dport) {
 299                                 udp_unlock(in6p->in6p_socket, 1, 0);
 300                                 continue;
 301                         }
 302                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
 303                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
 304                                                         &ip6->ip6_dst) &&
 305                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
 306                                                  m->m_pkthdr.rcvif)) {
 307                                         udp_unlock(in6p->in6p_socket, 1, 0);
 308                                         continue;
 309                                 }
 310                         }
 311                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 312                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
 313                                                         &ip6->ip6_src) ||
 314                                    in6p->in6p_fport != uh->uh_sport) {
 315                                         udp_unlock(in6p->in6p_socket, 1, 0);
 316                                         continue;
 317                                 }
 318                         }
 319
 320                         reuse_sock = in6p->inp_socket->so_options &
 321                             (SO_REUSEPORT | SO_REUSEADDR);
 322
 323                         {
 324 #if IPSEC
 325                                 int skipit = 0;
 326                                 /* Check AH/ESP integrity. */
 327                                 if (ipsec_bypass == 0) {
 328                                         if (ipsec6_in_reject_so(m, in6p->inp_socket)) {
 329                                                 IPSEC_STAT_INCREMENT(ipsec6stat.in_polvio);
 330                                                 /* do not inject data to pcb */
 331                                                 skipit = 1;
 332                                         }
 333                                 }
 334                                 if (skipit == 0)
 335 #endif /*IPSEC*/
 336                                 {
 337                                         /*
 338                                          * KAME NOTE: do not
 339                                          * m_copy(m, offset, ...) below.
 340                                          * sbappendaddr() expects M_PKTHDR,
 341                                          * and m_copy() will copy M_PKTHDR
 342                                          * only if offset is 0.
 343                                          */
 344                                         if (reuse_sock)
 345                                                 n = m_copy(m, 0, M_COPYALL);
 346                                         udp6_append(in6p, ip6, &udp_in6, m,
 347                                             off + sizeof (struct udphdr));
 348                                         mcast_delivered++;
 349                                 }
 350                                 udp_unlock(in6p->in6p_socket, 1, 0);
 351                         }
 352                         /*
 353                          * Don't look for additional matches if this one does
 354                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 355                          * socket options set.  This heuristic avoids searching
 356                          * through all pcbs in the common case of a non-shared
 357                          * port.  It assumes that an application will never
 358                          * clear these options after setting them.
 359                          */
 360                         if (reuse_sock == 0 || ((m = n) == NULL))
 361                                 break;
 362                         /*
 363                          * Recompute IP and UDP header pointers for new mbuf
 364                          */
 365                         ip6 = mtod(m, struct ip6_hdr *);
 366                         uh = (struct udphdr *)((caddr_t)ip6 + off);
 367                 }
 368                 lck_rw_done(pcbinfo->mtx);
 369
 370                 if (mcast_delivered == 0) {
 371                         /*
 372                          * No matching pcb found; discard datagram.
 373                          * (No need to send an ICMP Port Unreachable
 374                          * for a broadcast or multicast datgram.)
 375                          */
 376                         udpstat.udps_noport++;
 377 #ifndef __APPLE__
 378                         udpstat.udps_noportmcast++;
 379 #endif
 380                         goto bad;
 381                 }
 382
 383                 if (reuse_sock != 0)    /* free the extra copy of mbuf */
 384                         m_freem(m);
 385                 return IPPROTO_DONE;
 386         }
 387         /*
 388          * Locate pcb for datagram.
 389          */
 390         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
 391                                   &ip6->ip6_dst, uh->uh_dport, 1,
 392                                   m->m_pkthdr.rcvif);
 393         if (in6p == 0) {
 394                 if (log_in_vain) {
 395                         char buf[INET6_ADDRSTRLEN];
 396
 397                         strlcpy(buf, ip6_sprintf(&ip6->ip6_dst), sizeof(buf));
 398                         if (log_in_vain != 3)
 399                                 log(LOG_INFO,
 400                                     "Connection attempt to UDP %s:%d from %s:%d\n",
 401                                     buf, ntohs(uh->uh_dport),
 402                                     ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
 403                         else if (!(m->m_flags & (M_BCAST | M_MCAST)) &&
 404                                          !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &ip6->ip6_src))
 405                                 log_in_vain_log((LOG_INFO,
 406                                     "Connection attempt to UDP %s:%d from %s:%d\n",
 407                                     buf, ntohs(uh->uh_dport),
 408                                     ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport)));
 409                 }
 410                 udpstat.udps_noport++;
 411                 if (m->m_flags & M_MCAST) {
 412                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
 413 #ifndef __APPLE__
 414                         udpstat.udps_noportmcast++;
 415 #endif
 416                         goto bad;
 417                 }
 418                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 419                 return IPPROTO_DONE;
 420         }
 421 #if IPSEC
 422         /*
 423          * Check AH/ESP integrity.
 424          */
 425         if (ipsec_bypass == 0) {
 426                 if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
 427                         IPSEC_STAT_INCREMENT(ipsec6stat.in_polvio);
 428                         in_pcb_checkstate(in6p, WNT_RELEASE, 0);
 429                         goto bad;
 430                 }
 431         }
 432 #endif /*IPSEC*/
 433
 434         /*
 435          * Construct sockaddr format source address.
 436          * Stuff source address and datagram in user buffer.
 437          */
 438         udp_lock(in6p->in6p_socket, 1, 0);
 439
 440         if (in_pcb_checkstate(in6p, WNT_RELEASE, 1) == WNT_STOPUSING) {
 441                 udp_unlock(in6p->in6p_socket, 1, 0);
 442                 goto bad;
 443         }
 444
 445         init_sin6(&udp_in6, m); /* general init */
 446         udp_in6.sin6_port = uh->uh_sport;
 447         if (in6p->in6p_flags & IN6P_CONTROLOPTS
 448             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
 449                 ip6_savecontrol(in6p, &opts, ip6, m);
 450         m_adj(m, off + sizeof(struct udphdr));
 451         if (sbappendaddr(&in6p->in6p_socket->so_rcv,
 452                         (struct sockaddr *)&udp_in6,
 453                         m, opts, NULL) == 0) {
 454                 m = NULL;
 455                 opts = NULL;
 456                 udpstat.udps_fullsock++;
 457                 udp_unlock(in6p->in6p_socket, 1, 0);
 458                 goto bad;
 459         }
 460         sorwakeup(in6p->in6p_socket);
 461         udp_unlock(in6p->in6p_socket, 1, 0);
 462         return IPPROTO_DONE;
 463 bad:
 464         if (m)
 465                 m_freem(m);
 466         if (opts)
 467                 m_freem(opts);
 468         return IPPROTO_DONE;
 469 }
 470
 471 void
 472 udp6_ctlinput(
 473         int cmd,
 474         struct sockaddr *sa,
 475         void *d)
 476 {
 477         struct udphdr uh;
 478         struct ip6_hdr *ip6;
 479         struct mbuf *m;
 480         int off = 0;
 481         struct ip6ctlparam *ip6cp = NULL;
 482         const struct sockaddr_in6 *sa6_src = NULL;
 483         void (*notify)(struct inpcb *, int) = udp_notify;
 484         struct udp_portonly {
 485                 u_int16_t uh_sport;
 486                 u_int16_t uh_dport;
 487         } *uhp;
 488
 489         if (sa->sa_family != AF_INET6 ||
 490             sa->sa_len != sizeof(struct sockaddr_in6))
 491                 return;
 492
 493         if ((unsigned)cmd >= PRC_NCMDS)
 494                 return;
 495         if (PRC_IS_REDIRECT(cmd))
 496                 notify = in6_rtchange, d = NULL;
 497         else if (cmd == PRC_HOSTDEAD)
 498                 d = NULL;
 499         else if (inet6ctlerrmap[cmd] == 0)
 500                 return;
 501
 502         /* if the parameter is from icmp6, decode it. */
 503         if (d != NULL) {
 504                 ip6cp = (struct ip6ctlparam *)d;
 505                 m = ip6cp->ip6c_m;
 506                 ip6 = ip6cp->ip6c_ip6;
 507                 off = ip6cp->ip6c_off;
 508                 sa6_src = ip6cp->ip6c_src;
 509         } else {
 510                 m = NULL;
 511                 ip6 = NULL;
 512                 sa6_src = &sa6_any;
 513         }
 514
 515         if (ip6) {
 516                 /*
 517                  * XXX: We assume that when IPV6 is non NULL,
 518                  * M and OFF are valid.
 519                  */
 520
 521                 /* check if we can safely examine src and dst ports */
 522                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 523                         return;
 524
 525                 bzero(&uh, sizeof(uh));
 526                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 527
 528                 (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
 529                                         (struct sockaddr*)ip6cp->ip6c_src,
 530                                         uh.uh_sport, cmd, notify);
 531         } else
 532                 (void) in6_pcbnotify(&udbinfo, sa, 0, (struct sockaddr *)&sa6_src,
 533                                      0, cmd, notify);
 534 }
 535
 536 #ifndef __APPLE__
 537 static int
 538 udp6_getcred SYSCTL_HANDLER_ARGS
 539 {
 540         struct sockaddr_in6 addrs[2];
 541         struct inpcb *inp;
 542         int error, s;
 543
 544         error = proc_suser(req->p);
 545         if (error)
 546                 return (error);
 547
 548         if (req->newlen != sizeof(addrs))
 549                 return (EINVAL);
 550         if (req->oldlen != sizeof(*(kauth_cred_t)0))
 551                 return (EINVAL);
 552         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 553         if (error)
 554                 return (error);
 555         s = splnet();
 556         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
 557                                  addrs[1].sin6_port,
 558                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
 559                                  1, NULL);
 560         if (!inp || !inp->inp_socket || !inp->inp_socket->so_cred) {
 561                 error = ENOENT;
 562                 goto out;
 563         }
 564         error = SYSCTL_OUT(req, inp->inp_socket->so_cred->pc_ucred,
 565                            sizeof(*(kauth_cred_t)0));
 566
 567 out:
 568         splx(s);
 569         return (error);
 570 }
 571
 572 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 573             0, 0,
 574             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
 575 #endif
 576
 577 static int
 578 udp6_abort(struct socket *so)
 579 {
 580         struct inpcb *inp;
 581
 582         inp = sotoinpcb(so);
 583         if (inp == 0)
 584                 return EINVAL;  /* ??? possible? panic instead? */
 585         soisdisconnected(so);
 586         in6_pcbdetach(inp);
 587         return 0;
 588 }
 589
 590 static int
 591 udp6_attach(struct socket *so, __unused int proto, struct proc *p)
 592 {
 593         struct inpcb *inp;
 594         int error;
 595
 596         inp = sotoinpcb(so);
 597         if (inp != 0)
 598                 return EINVAL;
 599
 600         error = in_pcballoc(so, &udbinfo, p);
 601         if (error)
 602                 return error;
 603
 604         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 605                 error = soreserve(so, udp_sendspace, udp_recvspace);
 606                 if (error)
 607                         return error;
 608         }
 609         inp = (struct inpcb *)so->so_pcb;
 610         inp->inp_vflag |= INP_IPV6;
 611         if (ip6_mapped_addr_on)
 612                 inp->inp_vflag |= INP_IPV4;
 613         inp->in6p_hops = -1;    /* use kernel default */
 614         inp->in6p_cksum = -1;   /* just to be sure */
 615         /*
 616          * XXX: ugly!!
 617          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 618          * because the socket may be bound to an IPv6 wildcard address,
 619          * which may match an IPv4-mapped IPv6 address.
 620          */
 621         inp->inp_ip_ttl = ip_defttl;
 622         return 0;
 623 }
 624
 625 static int
 626 udp6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
 627 {
 628         struct inpcb *inp;
 629         int error;
 630
 631         inp = sotoinpcb(so);
 632         if (inp == 0)
 633                 return EINVAL;
 634
 635         inp->inp_vflag &= ~INP_IPV4;
 636         inp->inp_vflag |= INP_IPV6;
 637         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 638                 struct sockaddr_in6 *sin6_p;
 639
 640                 sin6_p = (struct sockaddr_in6 *)nam;
 641
 642                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 643                         inp->inp_vflag |= INP_IPV4;
 644                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 645                         struct sockaddr_in sin;
 646
 647                         in6_sin6_2_sin(&sin, sin6_p);
 648                         inp->inp_vflag |= INP_IPV4;
 649                         inp->inp_vflag &= ~INP_IPV6;
 650                         error = in_pcbbind(inp, (struct sockaddr *)&sin, p);
 651                         return error;
 652                 }
 653         }
 654
 655         error = in6_pcbbind(inp, nam, p);
 656         return error;
 657 }
 658
 659 static int
 660 udp6_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
 661 {
 662         struct inpcb *inp;
 663         int error;
 664
 665         inp = sotoinpcb(so);
 666         if (inp == 0)
 667                 return EINVAL;
 668
 669         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 670                 struct sockaddr_in6 *sin6_p;
 671
 672                 sin6_p = (struct sockaddr_in6 *)nam;
 673                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 674                         struct sockaddr_in sin;
 675
 676                         if (inp->inp_faddr.s_addr != INADDR_ANY)
 677                                 return EISCONN;
 678                         in6_sin6_2_sin(&sin, sin6_p);
 679                         error = in_pcbconnect(inp, (struct sockaddr *)&sin, p);
 680                         if (error == 0) {
 681                                 inp->inp_vflag |= INP_IPV4;
 682                                 inp->inp_vflag &= ~INP_IPV6;
 683                                 soisconnected(so);
 684                         }
 685                         return error;
 686                 }
 687         }
 688
 689         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 690                 return EISCONN;
 691         error = in6_pcbconnect(inp, nam, p);
 692         if (error == 0) {
 693                 if (ip6_mapped_addr_on || (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { /* should be non mapped addr */
 694                         inp->inp_vflag &= ~INP_IPV4;
 695                         inp->inp_vflag |= INP_IPV6;
 696                 }
 697                 soisconnected(so);
 698         }
 699         return error;
 700 }
 701
 702 static int
 703 udp6_detach(struct socket *so)
 704 {
 705         struct inpcb *inp;
 706
 707         inp = sotoinpcb(so);
 708         if (inp == 0)
 709                 return EINVAL;
 710         in6_pcbdetach(inp);
 711         return 0;
 712 }
 713
 714 static int
 715 udp6_disconnect(struct socket *so)
 716 {
 717         struct inpcb *inp;
 718
 719         inp = sotoinpcb(so);
 720         if (inp == 0)
 721                 return EINVAL;
 722
 723         if (inp->inp_vflag & INP_IPV4) {
 724                 struct pr_usrreqs *pru;
 725
 726                 pru = ip_protox[IPPROTO_UDP]->pr_usrreqs;
 727                 return ((*pru->pru_disconnect)(so));
 728         }
 729
 730         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 731                 return ENOTCONN;
 732
 733         in6_pcbdisconnect(inp);
 734         inp->in6p_laddr = in6addr_any;
 735         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 736         return 0;
 737 }
 738
 739 static int
 740 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 741           struct mbuf *control, struct proc *p)
 742 {
 743         struct inpcb *inp;
 744         int error = 0;
 745
 746         inp = sotoinpcb(so);
 747         if (inp == 0) {
 748                 error = EINVAL;
 749                 goto bad;
 750         }
 751
 752         if (addr) {
 753                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 754                         error = EINVAL;
 755                         goto bad;
 756                 }
 757                 if (addr->sa_family != AF_INET6) {
 758                         error = EAFNOSUPPORT;
 759                         goto bad;
 760                 }
 761         }
 762
 763         if (ip6_mapped_addr_on || (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 764                 int hasv4addr;
 765                 struct sockaddr_in6 *sin6 = 0;
 766
 767                 if (addr == 0)
 768                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 769                 else {
 770                         sin6 = (struct sockaddr_in6 *)addr;
 771                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 772                                 ? 1 : 0;
 773                 }
 774                 if (hasv4addr) {
 775                         struct pr_usrreqs *pru;
 776
 777                         if (sin6)
 778                                 in6_sin6_2_sin_in_sock(addr);
 779                         pru = ip_protox[IPPROTO_UDP]->pr_usrreqs;
 780                         error = ((*pru->pru_send)(so, flags, m, addr, control,
 781                                                   p));
 782                         /* addr will just be freed in sendit(). */
 783                         return error;
 784                 }
 785         }
 786
 787         return udp6_output(inp, m, addr, control, p);
 788
 789   bad:
 790         m_freem(m);
 791         return(error);
 792 }
 793
 794 struct pr_usrreqs udp6_usrreqs = {
 795         udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
 796         pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
 797         pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
 798         pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
 799         in6_mapped_sockaddr, sosend, soreceive, pru_sopoll_notsupp
 800 };