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 #include <sys/thread2.h>
  87
  88 #include <net/if.h>
  89 #include <net/route.h>
  90 #include <net/if_types.h>
  91
  92 #include <netinet/in.h>
  93 #include <netinet/in_systm.h>
  94 #include <netinet/ip.h>
  95 #include <netinet/in_pcb.h>
  96 #include <netinet/in_var.h>
  97 #include <netinet/ip_var.h>
  98 #include <netinet/udp.h>
  99 #include <netinet/udp_var.h>
 100 #include <netinet/ip6.h>
 101 #include <netinet6/ip6_var.h>
 102 #include <netinet6/in6_pcb.h>
 103 #include <netinet/icmp6.h>
 104 #include <netinet6/udp6_var.h>
 105 #include <netinet6/ip6protosw.h>
 106
 107 #ifdef IPSEC
 108 #include <netinet6/ipsec.h>
 109 #include <netinet6/ipsec6.h>
 110 #endif /* IPSEC */
 111
 112 #ifdef FAST_IPSEC
 113 #include <netproto/ipsec/ipsec.h>
 114 #include <netproto/ipsec/ipsec6.h>
 115 #endif /* FAST_IPSEC */
 116
 117 /*
 118  * UDP protocol inplementation.
 119  * Per RFC 768, August, 1980.
 120  */
 121
 122 extern  struct protosw inetsw[];
 123 static  int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *);
 124 static  int udp6_detach (struct socket *so);
 125
 126 static int
 127 in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, 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(struct mbuf **mp, int *offp, int proto)
 148 {
 149         struct mbuf *m = *mp;
 150         struct ip6_hdr *ip6;
 151         struct udphdr *uh;
 152         struct inpcb *in6p;
 153         struct  mbuf *opts = NULL;
 154         int off = *offp;
 155         int plen, ulen;
 156         struct sockaddr_in6 udp_in6;
 157
 158         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
 159
 160         ip6 = mtod(m, struct ip6_hdr *);
 161
 162         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
 163                 /* XXX send icmp6 host/port unreach? */
 164                 m_freem(m);
 165                 return IPPROTO_DONE;
 166         }
 167
 168         udpstat.udps_ipackets++;
 169
 170         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 171         uh = (struct udphdr *)((caddr_t)ip6 + off);
 172         ulen = ntohs((u_short)uh->uh_ulen);
 173
 174         if (plen != ulen) {
 175                 udpstat.udps_badlen++;
 176                 goto bad;
 177         }
 178
 179         /*
 180          * Checksum extended UDP header and data.
 181          */
 182         if (uh->uh_sum == 0)
 183                 udpstat.udps_nosum++;
 184         else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
 185                 udpstat.udps_badsum++;
 186                 goto bad;
 187         }
 188
 189         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 190                 struct  inpcb *last;
 191
 192                 /*
 193                  * Deliver a multicast datagram to all sockets
 194                  * for which the local and remote addresses and ports match
 195                  * those of the incoming datagram.  This allows more than
 196                  * one process to receive multicasts on the same port.
 197                  * (This really ought to be done for unicast datagrams as
 198                  * well, but that would cause problems with existing
 199                  * applications that open both address-specific sockets and
 200                  * a wildcard socket listening to the same port -- they would
 201                  * end up receiving duplicates of every unicast datagram.
 202                  * Those applications open the multiple sockets to overcome an
 203                  * inadequacy of the UDP socket interface, but for backwards
 204                  * compatibility we avoid the problem here rather than
 205                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 206                  */
 207
 208                 /*
 209                  * In a case that laddr should be set to the link-local
 210                  * address (this happens in RIPng), the multicast address
 211                  * specified in the received packet does not match with
 212                  * laddr. To cure this situation, the matching is relaxed
 213                  * if the receiving interface is the same as one specified
 214                  * in the socket and if the destination multicast address
 215                  * matches one of the multicast groups specified in the socket.
 216                  */
 217
 218                 /*
 219                  * Construct sockaddr format source address.
 220                  */
 221                 init_sin6(&udp_in6, m); /* general init */
 222                 udp_in6.sin6_port = uh->uh_sport;
 223                 /*
 224                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
 225                  * We need udphdr for IPsec processing so we do that later.
 226                  */
 227
 228                 /*
 229                  * Locate pcb(s) for datagram.
 230                  * (Algorithm copied from raw_intr().)
 231                  */
 232                 last = NULL;
 233                 LIST_FOREACH(in6p, &udbinfo.pcblisthead, inp_list) {
 234                         if (in6p->inp_flags & INP_PLACEMARKER)
 235                                 continue;
 236                         if (!(in6p->inp_vflag & INP_IPV6))
 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                                          * ssb_appendaddr() 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 (ssb_appendaddr(&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 (ssb_appendaddr(&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 == NULL) {
 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                         kprintf("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 (ssb_appendaddr(&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(int cmd, struct sockaddr *sa, void *d)
 426 {
 427         struct udphdr uh;
 428         struct ip6_hdr *ip6;
 429         struct mbuf *m;
 430         int off = 0;
 431         struct ip6ctlparam *ip6cp = NULL;
 432         const struct sockaddr_in6 *sa6_src = NULL;
 433         void (*notify) (struct inpcb *, int) = udp_notify;
 434         struct udp_portonly {
 435                 u_int16_t uh_sport;
 436                 u_int16_t uh_dport;
 437         } *uhp;
 438
 439         if (sa->sa_family != AF_INET6 ||
 440             sa->sa_len != sizeof(struct sockaddr_in6))
 441                 return;
 442
 443         if ((unsigned)cmd >= PRC_NCMDS)
 444                 return;
 445         if (PRC_IS_REDIRECT(cmd))
 446                 notify = in6_rtchange, d = NULL;
 447         else if (cmd == PRC_HOSTDEAD)
 448                 d = NULL;
 449         else if (inet6ctlerrmap[cmd] == 0)
 450                 return;
 451
 452         /* if the parameter is from icmp6, decode it. */
 453         if (d != NULL) {
 454                 ip6cp = (struct ip6ctlparam *)d;
 455                 m = ip6cp->ip6c_m;
 456                 ip6 = ip6cp->ip6c_ip6;
 457                 off = ip6cp->ip6c_off;
 458                 sa6_src = ip6cp->ip6c_src;
 459         } else {
 460                 m = NULL;
 461                 ip6 = NULL;
 462                 sa6_src = &sa6_any;
 463         }
 464
 465         if (ip6) {
 466                 /*
 467                  * XXX: We assume that when IPV6 is non NULL,
 468                  * M and OFF are valid.
 469                  */
 470
 471                 /* check if we can safely examine src and dst ports */
 472                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 473                         return;
 474
 475                 bzero(&uh, sizeof(uh));
 476                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 477
 478                 in6_pcbnotify(&udbinfo.pcblisthead, sa, uh.uh_dport,
 479                               (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport,
 480                               cmd, 0, notify);
 481         } else
 482                 in6_pcbnotify(&udbinfo.pcblisthead, sa, 0,
 483                               (const struct sockaddr *)sa6_src, 0,
 484                               cmd, 0, notify);
 485 }
 486
 487 static int
 488 udp6_getcred(SYSCTL_HANDLER_ARGS)
 489 {
 490         struct sockaddr_in6 addrs[2];
 491         struct inpcb *inp;
 492         int error;
 493
 494         error = priv_check(req->td, PRIV_ROOT);
 495         if (error)
 496                 return (error);
 497
 498         if (req->newlen != sizeof(addrs))
 499                 return (EINVAL);
 500         if (req->oldlen != sizeof(struct ucred))
 501                 return (EINVAL);
 502         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 503         if (error)
 504                 return (error);
 505         crit_enter();
 506         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
 507                                  addrs[1].sin6_port,
 508                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
 509                                  1, NULL);
 510         if (!inp || !inp->inp_socket) {
 511                 error = ENOENT;
 512                 goto out;
 513         }
 514         error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
 515                            sizeof(struct ucred));
 516
 517 out:
 518         crit_exit();
 519         return (error);
 520 }
 521
 522 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 523             0, 0,
 524             udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
 525
 526 static int
 527 udp6_abort(struct socket *so)
 528 {
 529         struct inpcb *inp;
 530
 531         inp = so->so_pcb;
 532         if (inp == NULL)
 533                 return EINVAL;  /* ??? possible? panic instead? */
 534         soisdisconnected(so);
 535         crit_enter();
 536         in6_pcbdetach(inp);
 537         crit_exit();
 538         return 0;
 539 }
 540
 541 static int
 542 udp6_attach(struct socket *so, int proto, struct pru_attach_info *ai)
 543 {
 544         struct inpcb *inp;
 545         int error;
 546
 547         inp = so->so_pcb;
 548         if (inp != NULL)
 549                 return EINVAL;
 550
 551         if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
 552                 error = soreserve(so, udp_sendspace, udp_recvspace,
 553                     ai->sb_rlimit);
 554                 if (error)
 555                         return error;
 556         }
 557         crit_enter();
 558         error = in_pcballoc(so, &udbinfo);
 559         crit_exit();
 560         if (error)
 561                 return error;
 562         so->so_port = udp_soport_attach(so);
 563         inp = (struct inpcb *)so->so_pcb;
 564         inp->inp_vflag |= INP_IPV6;
 565         if (!ip6_v6only)
 566                 inp->inp_vflag |= INP_IPV4;
 567         inp->in6p_hops = -1;    /* use kernel default */
 568         inp->in6p_cksum = -1;   /* just to be sure */
 569         /*
 570          * XXX: ugly!!
 571          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 572          * because the socket may be bound to an IPv6 wildcard address,
 573          * which may match an IPv4-mapped IPv6 address.
 574          */
 575         inp->inp_ip_ttl = ip_defttl;
 576         return 0;
 577 }
 578
 579 static int
 580 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 581 {
 582         struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam;
 583         struct inpcb *inp;
 584         int error;
 585
 586         inp = so->so_pcb;
 587         if (inp == NULL)
 588                 return EINVAL;
 589
 590         inp->inp_vflag &= ~INP_IPV4;
 591         inp->inp_vflag |= INP_IPV6;
 592         if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 593                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 594                         inp->inp_vflag |= INP_IPV4;
 595                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 596                         struct sockaddr_in sin;
 597
 598                         in6_sin6_2_sin(&sin, sin6_p);
 599                         inp->inp_vflag |= INP_IPV4;
 600                         inp->inp_vflag &= ~INP_IPV6;
 601                         crit_enter();
 602                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
 603                         crit_exit();
 604                         return error;
 605                 }
 606         }
 607
 608         crit_enter();
 609         error = in6_pcbbind(inp, nam, td);
 610         crit_exit();
 611         if (error == 0) {
 612                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 613                         inp->inp_flags |= INP_WASBOUND_NOTANY;
 614                 in_pcbinswildcardhash(inp);
 615         }
 616         return error;
 617 }
 618
 619 static int
 620 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 621 {
 622         struct inpcb *inp;
 623         int error;
 624
 625         inp = so->so_pcb;
 626         if (inp == NULL)
 627                 return EINVAL;
 628
 629         if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) {
 630                 struct sockaddr_in6 *sin6_p;
 631
 632                 sin6_p = (struct sockaddr_in6 *)nam;
 633                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 634                         struct sockaddr_in sin;
 635
 636                         if (inp->inp_faddr.s_addr != INADDR_ANY)
 637                                 return EISCONN;
 638                         in6_sin6_2_sin(&sin, sin6_p);
 639                         crit_enter();
 640                         error = in_pcbconnect(inp, (struct sockaddr *)&sin, td);
 641                         crit_exit();
 642                         if (error == 0) {
 643                                 inp->inp_vflag |= INP_IPV4;
 644                                 inp->inp_vflag &= ~INP_IPV6;
 645                                 soisconnected(so);
 646                         }
 647                         return error;
 648                 }
 649         }
 650         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 651                 return EISCONN;
 652         if (inp->inp_flags & INP_WILDCARD)
 653                 in_pcbremwildcardhash(inp);
 654         if (!prison_remote_ip(td, nam))
 655                 return(EAFNOSUPPORT); /* IPv4 only jail */
 656         crit_enter();
 657         error = in6_pcbconnect(inp, nam, td);
 658         crit_exit();
 659         if (error == 0) {
 660                 if (!ip6_v6only) { /* should be non mapped addr */
 661                         inp->inp_vflag &= ~INP_IPV4;
 662                         inp->inp_vflag |= INP_IPV6;
 663                 }
 664                 /* sosetport(so, port); here, see udp v4 code */
 665                 soisconnected(so);
 666         } else if (error == EAFNOSUPPORT) {     /* connection dissolved */
 667                 /*
 668                  * Follow traditional BSD behavior and retain
 669                  * the local port binding.  But, fix the old misbehavior
 670                  * of overwriting any previously bound local address.
 671                  */
 672                 if (!(inp->inp_flags & INP_WASBOUND_NOTANY))
 673                         inp->in6p_laddr = kin6addr_any;
 674                 in_pcbinswildcardhash(inp);
 675         }
 676         return error;
 677 }
 678
 679 static int
 680 udp6_detach(struct socket *so)
 681 {
 682         struct inpcb *inp;
 683
 684         inp = so->so_pcb;
 685         if (inp == NULL)
 686                 return EINVAL;
 687         crit_enter();
 688         in6_pcbdetach(inp);
 689         crit_exit();
 690         return 0;
 691 }
 692
 693 static int
 694 udp6_disconnect(struct socket *so)
 695 {
 696         struct inpcb *inp;
 697
 698         inp = so->so_pcb;
 699         if (inp == NULL)
 700                 return EINVAL;
 701
 702         if (inp->inp_vflag & INP_IPV4) {
 703                 const struct pr_usrreqs *pru;
 704
 705                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 706                 return ((*pru->pru_disconnect)(so));
 707         }
 708
 709         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 710                 return ENOTCONN;
 711
 712         crit_enter();
 713         in6_pcbdisconnect(inp);
 714         crit_exit();
 715         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 716         return 0;
 717 }
 718
 719 static int
 720 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 721           struct mbuf *control, struct thread *td)
 722 {
 723         struct inpcb *inp;
 724         int error = 0;
 725
 726         inp = so->so_pcb;
 727         if (inp == NULL) {
 728                 error = EINVAL;
 729                 goto bad;
 730         }
 731
 732         if (addr) {
 733                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 734                         error = EINVAL;
 735                         goto bad;
 736                 }
 737                 if (addr->sa_family != AF_INET6) {
 738                         error = EAFNOSUPPORT;
 739                         goto bad;
 740                 }
 741         }
 742
 743         if (!ip6_v6only) {
 744                 int hasv4addr;
 745                 struct sockaddr_in6 *sin6 = 0;
 746
 747                 if (addr == NULL)
 748                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 749                 else {
 750                         sin6 = (struct sockaddr_in6 *)addr;
 751                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 752                                 ? 1 : 0;
 753                 }
 754                 if (hasv4addr) {
 755                         const struct pr_usrreqs *pru;
 756
 757                         if (sin6)
 758                                 in6_sin6_2_sin_in_sock(addr);
 759                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 760                         error = ((*pru->pru_send)(so, flags, m, addr,
 761                                     control, td));
 762                         /* addr will just be freed in sendit(). */
 763                         return error;
 764                 }
 765         }
 766
 767         return udp6_output(inp, m, addr, control, td);
 768
 769 bad:
 770         m_freem(m);
 771         return (error);
 772 }
 773
 774 struct pr_usrreqs udp6_usrreqs = {
 775         .pru_abort = udp6_abort,
 776         .pru_accept = pru_accept_notsupp,
 777         .pru_attach = udp6_attach,
 778         .pru_bind = udp6_bind,
 779         .pru_connect = udp6_connect,
 780         .pru_connect2 = pru_connect2_notsupp,
 781         .pru_control = in6_control,
 782         .pru_detach = udp6_detach,
 783         .pru_disconnect = udp6_disconnect,
 784         .pru_listen = pru_listen_notsupp,
 785         .pru_peeraddr = in6_mapped_peeraddr,
 786         .pru_rcvd = pru_rcvd_notsupp,
 787         .pru_rcvoob = pru_rcvoob_notsupp,
 788         .pru_send = udp6_send,
 789         .pru_sense = pru_sense_null,
 790         .pru_shutdown = udp_shutdown,
 791         .pru_sockaddr = in6_mapped_sockaddr,
 792         .pru_sosend = sosend,
 793         .pru_soreceive = soreceive,
 794         .pru_sopoll = sopoll
 795 };
 796