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 1.26 2007/04/22 01:13:14 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 #include <sys/priv.h>
  86
  87 #include <sys/thread2.h>
  88 #include <sys/socketvar2.h>
  89
  90 #include <net/if.h>
  91 #include <net/route.h>
  92 #include <net/if_types.h>
  93
  94 #include <netinet/in.h>
  95 #include <netinet/in_systm.h>
  96 #include <netinet/ip.h>
  97 #include <netinet/in_pcb.h>
  98 #include <netinet/in_var.h>
  99 #include <netinet/ip_var.h>
 100 #include <netinet/udp.h>
 101 #include <netinet/udp_var.h>
 102 #include <netinet/ip6.h>
 103 #include <netinet6/ip6_var.h>
 104 #include <netinet6/in6_pcb.h>
 105 #include <netinet/icmp6.h>
 106 #include <netinet6/udp6_var.h>
 107 #include <netinet6/ip6protosw.h>
 108
 109 #ifdef IPSEC
 110 #include <netinet6/ipsec.h>
 111 #include <netinet6/ipsec6.h>
 112 #endif /* IPSEC */
 113
 114 #ifdef FAST_IPSEC
 115 #include <netproto/ipsec/ipsec.h>
 116 #include <netproto/ipsec/ipsec6.h>
 117 #endif /* FAST_IPSEC */
 118
 119 /*
 120  * UDP protocol inplementation.
 121  * Per RFC 768, August, 1980.
 122  */
 123
 124 extern  struct protosw inetsw[];
 125 static  int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *);
 126 static  int udp6_detach (struct socket *so);
 127
 128 static int
 129 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp)
 130 {
 131         struct ip6_moptions *im6o = in6p->in6p_moptions;
 132         struct in6_multi_mship *imm;
 133
 134         if (im6o == NULL)
 135                 return 0;
 136
 137         for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
 138              imm = imm->i6mm_chain.le_next) {
 139                 if ((ifp == NULL ||
 140                      imm->i6mm_maddr->in6m_ifp == ifp) &&
 141                     IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
 142                                        ia6))
 143                         return 1;
 144         }
 145         return 0;
 146 }
 147
 148 int
 149 udp6_input(struct mbuf **mp, int *offp, int proto)
 150 {
 151         struct mbuf *m = *mp;
 152         struct ip6_hdr *ip6;
 153         struct udphdr *uh;
 154         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, &udbinfo.pcblisthead, inp_list) {
 236                         if (in6p->inp_flags & INP_PLACEMARKER)
 237                                 continue;
 238                         if (!(in6p->inp_vflag & INP_IPV6))
 239                                 continue;
 240                         if (in6p->in6p_lport != uh->uh_dport)
 241                                 continue;
 242                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
 243                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
 244                                                         &ip6->ip6_dst) &&
 245                                     !in6_mcmatch(in6p, &ip6->ip6_dst,
 246                                                  m->m_pkthdr.rcvif))
 247                                         continue;
 248                         }
 249                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 250                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
 251                                                         &ip6->ip6_src) ||
 252                                    in6p->in6p_fport != uh->uh_sport)
 253                                         continue;
 254                         }
 255
 256                         if (last != NULL) {
 257                                 struct  mbuf *n;
 258
 259 #ifdef IPSEC
 260                                 /*
 261                                  * Check AH/ESP integrity.
 262                                  */
 263                                 if (ipsec6_in_reject_so(m, last->inp_socket))
 264                                         ipsec6stat.in_polvio++;
 265                                         /* do not inject data into pcb */
 266                                 else
 267 #endif /* IPSEC */
 268 #ifdef FAST_IPSEC
 269                                 /*
 270                                  * Check AH/ESP integrity.
 271                                  */
 272                                 if (ipsec6_in_reject(m, last))
 273                                         ;
 274                                 else
 275 #endif /* FAST_IPSEC */
 276                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 277                                         /*
 278                                          * KAME NOTE: do not
 279                                          * m_copy(m, offset, ...) above.
 280                                          * ssb_appendaddr() expects M_PKTHDR,
 281                                          * and m_copy() will copy M_PKTHDR
 282                                          * only if offset is 0.
 283                                          */
 284                                         if (last->in6p_flags & IN6P_CONTROLOPTS
 285                                             || last->in6p_socket->so_options & SO_TIMESTAMP)
 286                                                 ip6_savecontrol(last, &opts,
 287                                                                 ip6, n);
 288
 289                                         m_adj(n, off + sizeof(struct udphdr));
 290                                         if (ssb_appendaddr(&last->in6p_socket->so_rcv,
 291                                                         (struct sockaddr *)&udp_in6,
 292                                                         n, opts) == 0) {
 293                                                 m_freem(n);
 294                                                 if (opts)
 295                                                         m_freem(opts);
 296                                                 udpstat.udps_fullsock++;
 297                                         } else
 298                                                 sorwakeup(last->in6p_socket);
 299                                         opts = NULL;
 300                                 }
 301                         }
 302                         last = in6p;
 303                         /*
 304                          * Don't look for additional matches if this one does
 305                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 306                          * socket options set.  This heuristic avoids searching
 307                          * through all pcbs in the common case of a non-shared
 308                          * port.  It assumes that an application will never
 309                          * clear these options after setting them.
 310                          */
 311                         if ((last->in6p_socket->so_options &
 312                              (SO_REUSEPORT | SO_REUSEADDR)) == 0)
 313                                 break;
 314                 }
 315
 316                 if (last == NULL) {
 317                         /*
 318                          * No matching pcb found; discard datagram.
 319                          * (No need to send an ICMP Port Unreachable
 320                          * for a broadcast or multicast datgram.)
 321                          */
 322                         udpstat.udps_noport++;
 323                         udpstat.udps_noportmcast++;
 324                         goto bad;
 325                 }
 326 #ifdef IPSEC
 327                 /*
 328                  * Check AH/ESP integrity.
 329                  */
 330                 if (ipsec6_in_reject_so(m, last->inp_socket)) {
 331                         ipsec6stat.in_polvio++;
 332                         goto bad;
 333                 }
 334 #endif /* IPSEC */
 335 #ifdef FAST_IPSEC
 336                 /*
 337                  * Check AH/ESP integrity.
 338                  */
 339                 if (ipsec6_in_reject(m, last)) {
 340                         goto bad;
 341                 }
 342 #endif /* FAST_IPSEC */
 343                 if (last->in6p_flags & IN6P_CONTROLOPTS
 344                     || last->in6p_socket->so_options & SO_TIMESTAMP)
 345                         ip6_savecontrol(last, &opts, ip6, m);
 346
 347                 m_adj(m, off + sizeof(struct udphdr));
 348                 if (ssb_appendaddr(&last->in6p_socket->so_rcv,
 349                                 (struct sockaddr *)&udp_in6,
 350                                 m, opts) == 0) {
 351                         udpstat.udps_fullsock++;
 352                         goto bad;
 353                 }
 354                 sorwakeup(last->in6p_socket);
 355                 return IPPROTO_DONE;
 356         }
 357         /*
 358          * Locate pcb for datagram.
 359          */
 360         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
 361                                   &ip6->ip6_dst, uh->uh_dport, 1,
 362                                   m->m_pkthdr.rcvif);
 363         if (in6p == NULL) {
 364                 if (log_in_vain) {
 365                         char buf[INET6_ADDRSTRLEN];
 366
 367                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
 368                         log(LOG_INFO,
 369                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 370                             buf, ntohs(uh->uh_dport),
 371                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
 372                 }
 373                 udpstat.udps_noport++;
 374                 if (m->m_flags & M_MCAST) {
 375                         kprintf("UDP6: M_MCAST is set in a unicast packet.\n");
 376                         udpstat.udps_noportmcast++;
 377                         goto bad;
 378                 }
 379                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 380                 return IPPROTO_DONE;
 381         }
 382 #ifdef IPSEC
 383         /*
 384          * Check AH/ESP integrity.
 385          */
 386         if (ipsec6_in_reject_so(m, in6p->in6p_socket)) {
 387                 ipsec6stat.in_polvio++;
 388                 goto bad;
 389         }
 390 #endif /* IPSEC */
 391 #ifdef FAST_IPSEC
 392         /*
 393          * Check AH/ESP integrity.
 394          */
 395         if (ipsec6_in_reject(m, in6p)) {
 396                 goto bad;
 397         }
 398 #endif /* FAST_IPSEC */
 399
 400         /*
 401          * Construct sockaddr format source address.
 402          * Stuff source address and datagram in user buffer.
 403          */
 404         init_sin6(&udp_in6, m); /* general init */
 405         udp_in6.sin6_port = uh->uh_sport;
 406         if (in6p->in6p_flags & IN6P_CONTROLOPTS
 407             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
 408                 ip6_savecontrol(in6p, &opts, ip6, m);
 409         m_adj(m, off + sizeof(struct udphdr));
 410         if (ssb_appendaddr(&in6p->in6p_socket->so_rcv,
 411                         (struct sockaddr *)&udp_in6,
 412                         m, opts) == 0) {
 413                 udpstat.udps_fullsock++;
 414                 goto bad;
 415         }
 416         sorwakeup(in6p->in6p_socket);
 417         return IPPROTO_DONE;
 418 bad:
 419         if (m)
 420                 m_freem(m);
 421         if (opts)
 422                 m_freem(opts);
 423         return IPPROTO_DONE;
 424 }
 425
 426 void
 427 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 428 {
 429         struct udphdr uh;
 430         struct ip6_hdr *ip6;
 431         struct mbuf *m;
 432         int off = 0;
 433         struct ip6ctlparam *ip6cp = NULL;
 434         const struct sockaddr_in6 *sa6_src = NULL;
 435         void (*notify) (struct inpcb *, int) = udp_notify;
 436         struct udp_portonly {
 437                 u_int16_t uh_sport;
 438                 u_int16_t uh_dport;
 439         } *uhp;
 440
 441         if (sa->sa_family != AF_INET6 ||
 442             sa->sa_len != sizeof(struct sockaddr_in6))
 443                 return;
 444
 445         if ((unsigned)cmd >= PRC_NCMDS)
 446                 return;
 447         if (PRC_IS_REDIRECT(cmd))
 448                 notify = in6_rtchange, d = NULL;
 449         else if (cmd == PRC_HOSTDEAD)
 450                 d = NULL;
 451         else if (inet6ctlerrmap[cmd] == 0)
 452                 return;
 453
 454         /* if the parameter is from icmp6, decode it. */
 455         if (d != NULL) {
 456                 ip6cp = (struct ip6ctlparam *)d;
 457                 m = ip6cp->ip6c_m;
 458                 ip6 = ip6cp->ip6c_ip6;
 459                 off = ip6cp->ip6c_off;
 460                 sa6_src = ip6cp->ip6c_src;
 461         } else {
 462                 m = NULL;
 463                 ip6 = NULL;
 464                 sa6_src = &sa6_any;
 465         }
 466
 467         if (ip6) {
 468                 /*
 469                  * XXX: We assume that when IPV6 is non NULL,
 470                  * M and OFF are valid.
 471                  */
 472
 473                 /* check if we can safely examine src and dst ports */
 474                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 475                         return;
 476
 477                 bzero(&uh, sizeof(uh));
 478                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 479
 480                 in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport,
 481                               (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
 482                               cmd, 0, notify);
 483         } else
 484                 in6_pcbnotify(&udbinfo.pcblisthead, sa, 0,
 485                               (const struct sockaddr *)sa6_src, 0,
 486                               cmd, 0, 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;
 495
 496         error = priv_check(req->td, PRIV_ROOT);
 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         crit_enter();
 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         crit_exit();
 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 /*
 529  * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
 530  *       will sofree() it when we return.
 531  */
 532 static int
 533 udp6_abort(struct socket *so)
 534 {
 535         struct inpcb *inp;
 536         int error;
 537
 538         inp = so->so_pcb;
 539         if (inp) {
 540                 soisdisconnected(so);
 541                 in6_pcbdetach(inp);
 542                 error = 0;
 543         } else {
 544                 error = EINVAL;
 545         }
 546
 547         return error;
 548 }
 549
 550 static int
 551 udp6_attach(struct socket *so, int proto, struct pru_attach_info *ai)
 552 {
 553         struct inpcb *inp;
 554         int error;
 555
 556         inp = so->so_pcb;
 557         if (inp != NULL)
 558                 return EINVAL;
 559
 560         if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
 561                 error = soreserve(so, udp_sendspace, udp_recvspace,
 562                     ai->sb_rlimit);
 563                 if (error)
 564                         return error;
 565         }
 566         crit_enter();
 567         error = in_pcballoc(so, &udbinfo);
 568         crit_exit();
 569         if (error)
 570                 return error;
 571         so->so_port = udp_soport_attach(so);
 572         inp = (struct inpcb *)so->so_pcb;
 573         inp->inp_vflag |= INP_IPV6;
 574         if (!ip6_v6only)
 575                 inp->inp_vflag |= INP_IPV4;
 576         inp->in6p_hops = -1;    /* use kernel default */
 577         inp->in6p_cksum = -1;   /* just to be sure */
 578         /*
 579          * XXX: ugly!!
 580          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 581          * because the socket may be bound to an IPv6 wildcard address,
 582          * which may match an IPv4-mapped IPv6 address.
 583          */
 584         inp->inp_ip_ttl = ip_defttl;
 585         return 0;
 586 }
 587
 588 static int
 589 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 590 {
 591         struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
 592         struct inpcb *inp;
 593         int error;
 594
 595         inp = so->so_pcb;
 596         if (inp == NULL)
 597                 return EINVAL;
 598
 599         inp->inp_vflag &= ~INP_IPV4;
 600         inp->inp_vflag |= INP_IPV6;
 601         if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 602                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 603                         inp->inp_vflag |= INP_IPV4;
 604                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 605                         struct sockaddr_in sin;
 606
 607                         in6_sin6_2_sin(&sin, sin6_p);
 608                         inp->inp_vflag |= INP_IPV4;
 609                         inp->inp_vflag &= ~INP_IPV6;
 610                         crit_enter();
 611                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
 612                         crit_exit();
 613                         return error;
 614                 }
 615         }
 616
 617         crit_enter();
 618         error = in6_pcbbind(inp, nam, td);
 619         crit_exit();
 620         if (error == 0) {
 621                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 622                         inp->inp_flags |= INP_WASBOUND_NOTANY;
 623                 in_pcbinswildcardhash(inp);
 624         }
 625         return error;
 626 }
 627
 628 static int
 629 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 630 {
 631         struct inpcb *inp;
 632         int error;
 633
 634         inp = so->so_pcb;
 635         if (inp == NULL)
 636                 return EINVAL;
 637
 638         if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 639                 struct sockaddr_in6 *sin6_p;
 640
 641                 sin6_p = (struct sockaddr_in6 *)nam;
 642                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 643                         struct sockaddr_in sin;
 644
 645                         if (inp->inp_faddr.s_addr != INADDR_ANY)
 646                                 return EISCONN;
 647                         in6_sin6_2_sin(&sin, sin6_p);
 648                         crit_enter();
 649                         error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
 650                         crit_exit();
 651                         if (error == 0) {
 652                                 inp->inp_vflag |= INP_IPV4;
 653                                 inp->inp_vflag &= ~INP_IPV6;
 654                                 soisconnected(so);
 655                         }
 656                         return error;
 657                 }
 658         }
 659         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 660                 return EISCONN;
 661         if (inp->inp_flags & INP_WILDCARD)
 662                 in_pcbremwildcardhash(inp);
 663         if (!prison_remote_ip(td, nam))
 664                 return(EAFNOSUPPORT); /* IPv4 only jail */
 665         crit_enter();
 666         error = in6_pcbconnect(inp, nam, td);
 667         crit_exit();
 668         if (error == 0) {
 669                 if (!ip6_v6only) { /* should be non mapped addr */
 670                         inp->inp_vflag &= ~INP_IPV4;
 671                         inp->inp_vflag |= INP_IPV6;
 672                 }
 673                 /* sosetport(so, port); here, see udp v4 code */
 674                 soisconnected(so);
 675         } else if (error == EAFNOSUPPORT) {     /* connection dissolved */
 676                 /*
 677                  * Follow traditional BSD behavior and retain
 678                  * the local port binding.  But, fix the old misbehavior
 679                  * of overwriting any previously bound local address.
 680                  */
 681                 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
 682                         inp->in6p_laddr = kin6addr_any;
 683                 in_pcbinswildcardhash(inp);
 684         }
 685         return error;
 686 }
 687
 688 static int
 689 udp6_detach(struct socket *so)
 690 {
 691         struct inpcb *inp;
 692
 693         inp = so->so_pcb;
 694         if (inp == NULL)
 695                 return EINVAL;
 696         crit_enter();
 697         in6_pcbdetach(inp);
 698         crit_exit();
 699         return 0;
 700 }
 701
 702 static int
 703 udp6_disconnect(struct socket *so)
 704 {
 705         struct inpcb *inp;
 706
 707         inp = so->so_pcb;
 708         if (inp == NULL)
 709                 return EINVAL;
 710
 711         if (inp->inp_vflag & INP_IPV4) {
 712                 const struct pr_usrreqs *pru;
 713
 714                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 715                 return ((*pru->pru_disconnect)(so));
 716         }
 717
 718         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 719                 return ENOTCONN;
 720
 721         crit_enter();
 722         in6_pcbdisconnect(inp);
 723         crit_exit();
 724         soclrstate(so, SS_ISCONNECTED);         /* XXX */
 725         return 0;
 726 }
 727
 728 static int
 729 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 730           struct mbuf *control, struct thread *td)
 731 {
 732         struct inpcb *inp;
 733         int error = 0;
 734
 735         inp = so->so_pcb;
 736         if (inp == NULL) {
 737                 error = EINVAL;
 738                 goto bad;
 739         }
 740
 741         if (addr) {
 742                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 743                         error = EINVAL;
 744                         goto bad;
 745                 }
 746                 if (addr->sa_family != AF_INET6) {
 747                         error = EAFNOSUPPORT;
 748                         goto bad;
 749                 }
 750         }
 751
 752         if (!ip6_v6only) {
 753                 int hasv4addr;
 754                 struct sockaddr_in6 *sin6 = 0;
 755
 756                 if (addr == NULL)
 757                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 758                 else {
 759                         sin6 = (struct sockaddr_in6 *)addr;
 760                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 761                                 ? 1 : 0;
 762                 }
 763                 if (hasv4addr) {
 764                         const struct pr_usrreqs *pru;
 765
 766                         if (sin6)
 767                                 in6_sin6_2_sin_in_sock(addr);
 768                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 769                         error = ((*pru->pru_send)(so, flags, m, addr,
 770                                     control, td));
 771                         /* addr will just be freed in sendit(). */
 772                         return error;
 773                 }
 774         }
 775
 776         return udp6_output(inp, m, addr, control, td);
 777
 778 bad:
 779         m_freem(m);
 780         return (error);
 781 }
 782
 783 struct pr_usrreqs udp6_usrreqs = {
 784         .pru_abort = udp6_abort,
 785         .pru_accept = pru_accept_notsupp,
 786         .pru_attach = udp6_attach,
 787         .pru_bind = udp6_bind,
 788         .pru_connect = udp6_connect,
 789         .pru_connect2 = pru_connect2_notsupp,
 790         .pru_control = in6_control,
 791         .pru_detach = udp6_detach,
 792         .pru_disconnect = udp6_disconnect,
 793         .pru_listen = pru_listen_notsupp,
 794         .pru_peeraddr = in6_mapped_peeraddr,
 795         .pru_rcvd = pru_rcvd_notsupp,
 796         .pru_rcvoob = pru_rcvoob_notsupp,
 797         .pru_send = udp6_send,
 798         .pru_sense = pru_sense_null,
 799         .pru_shutdown = udp_shutdown,
 800         .pru_sockaddr = in6_mapped_sockaddr,
 801         .pru_sosend = sosend,
 802         .pru_soreceive = soreceive
 803 };
 804