6/sys/netinet6/udp6_usrreq.c

   1 /*-
   2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $
  30  *      $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $
  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  * 4. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  *      @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
  62  */
  63
  64 #include <sys/cdefs.h>
  65 __FBSDID("$FreeBSD$");
  66
  67 #include "opt_inet.h"
  68 #include "opt_inet6.h"
  69 #include "opt_ipsec.h"
  70
  71 #include <sys/param.h>
  72 #include <sys/errno.h>
  73 #include <sys/kernel.h>
  74 #include <sys/lock.h>
  75 #include <sys/mbuf.h>
  76 #include <sys/proc.h>
  77 #include <sys/protosw.h>
  78 #include <sys/signalvar.h>
  79 #include <sys/socket.h>
  80 #include <sys/socketvar.h>
  81 #include <sys/stat.h>
  82 #include <sys/sx.h>
  83 #include <sys/sysctl.h>
  84 #include <sys/syslog.h>
  85 #include <sys/systm.h>
  86
  87 #include <net/if.h>
  88 #include <net/if_types.h>
  89 #include <net/route.h>
  90
  91 #include <netinet/in.h>
  92 #include <netinet/in_pcb.h>
  93 #include <netinet/in_systm.h>
  94 #include <netinet/in_var.h>
  95 #include <netinet/ip.h>
  96 #include <netinet/ip6.h>
  97 #include <netinet/icmp6.h>
  98 #include <netinet/ip_var.h>
  99 #include <netinet/udp.h>
 100 #include <netinet/udp_var.h>
 101 #include <netinet6/ip6protosw.h>
 102 #include <netinet6/ip6_var.h>
 103 #include <netinet6/in6_pcb.h>
 104 #include <netinet6/udp6_var.h>
 105 #include <netinet6/scope6_var.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 <netipsec/ipsec.h>
 114 #include <netipsec/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 udp6_detach __P((struct socket *so));
 124
 125 int
 126 udp6_input(mp, offp, proto)
 127         struct mbuf **mp;
 128         int *offp, proto;
 129 {
 130         struct mbuf *m = *mp, *opts;
 131         register struct ip6_hdr *ip6;
 132         register struct udphdr *uh;
 133         register struct inpcb *in6p;
 134         int off = *offp;
 135         int plen, ulen;
 136         struct sockaddr_in6 fromsa;
 137
 138         opts = NULL;
 139
 140         ip6 = mtod(m, struct ip6_hdr *);
 141
 142         if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
 143                 /* XXX send icmp6 host/port unreach? */
 144                 m_freem(m);
 145                 return IPPROTO_DONE;
 146         }
 147
 148 #ifndef PULLDOWN_TEST
 149         IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
 150         ip6 = mtod(m, struct ip6_hdr *);
 151         uh = (struct udphdr *)((caddr_t)ip6 + off);
 152 #else
 153         IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(*uh));
 154         if (!uh)
 155                 return IPPROTO_DONE;
 156 #endif
 157
 158         udpstat.udps_ipackets++;
 159
 160         plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
 161         ulen = ntohs((u_short)uh->uh_ulen);
 162
 163         if (plen != ulen) {
 164                 udpstat.udps_badlen++;
 165                 goto bad;
 166         }
 167
 168         /*
 169          * Checksum extended UDP header and data.
 170          */
 171         if (uh->uh_sum == 0) {
 172                 udpstat.udps_nosum++;
 173                 goto bad;
 174         }
 175         if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
 176                 udpstat.udps_badsum++;
 177                 goto bad;
 178         }
 179
 180         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
 181                 struct  inpcb *last;
 182
 183                 /*
 184                  * Deliver a multicast datagram to all sockets
 185                  * for which the local and remote addresses and ports match
 186                  * those of the incoming datagram.  This allows more than
 187                  * one process to receive multicasts on the same port.
 188                  * (This really ought to be done for unicast datagrams as
 189                  * well, but that would cause problems with existing
 190                  * applications that open both address-specific sockets and
 191                  * a wildcard socket listening to the same port -- they would
 192                  * end up receiving duplicates of every unicast datagram.
 193                  * Those applications open the multiple sockets to overcome an
 194                  * inadequacy of the UDP socket interface, but for backwards
 195                  * compatibility we avoid the problem here rather than
 196                  * fixing the interface.  Maybe 4.5BSD will remedy this?)
 197                  */
 198
 199                 /*
 200                  * In a case that laddr should be set to the link-local
 201                  * address (this happens in RIPng), the multicast address
 202                  * specified in the received packet does not match with
 203                  * laddr. To cure this situation, the matching is relaxed
 204                  * if the receiving interface is the same as one specified
 205                  * in the socket and if the destination multicast address
 206                  * matches one of the multicast groups specified in the socket.
 207                  */
 208
 209                 /*
 210                  * Construct sockaddr format source address.
 211                  */
 212                 init_sin6(&fromsa, m);
 213                 fromsa.sin6_port = uh->uh_sport;
 214                 /*
 215                  * KAME note: traditionally we dropped udpiphdr from mbuf here.
 216                  * We need udphdr for IPsec processing so we do that later.
 217                  */
 218
 219                 /*
 220                  * Locate pcb(s) for datagram.
 221                  * (Algorithm copied from raw_intr().)
 222                  */
 223                 last = NULL;
 224                 LIST_FOREACH(in6p, &udb, inp_list) {
 225                         if ((in6p->inp_vflag & INP_IPV6) == 0)
 226                                 continue;
 227                         if (in6p->in6p_lport != uh->uh_dport)
 228                                 continue;
 229                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
 230                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
 231                                                         &ip6->ip6_dst))
 232                                         continue;
 233                         }
 234                         if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
 235                                 if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
 236                                                         &ip6->ip6_src) ||
 237                                     in6p->in6p_fport != uh->uh_sport)
 238                                         continue;
 239                         }
 240
 241                         if (last != NULL) {
 242                                 struct mbuf *n;
 243
 244 #if defined(IPSEC) || defined(FAST_IPSEC)
 245                                 /*
 246                                  * Check AH/ESP integrity.
 247                                  */
 248                                 if (ipsec6_in_reject(m, last)) {
 249 #ifdef IPSEC
 250                                         ipsec6stat.in_polvio++;
 251 #endif /* IPSEC */
 252                                         /* do not inject data into pcb */
 253                                 } else
 254 #endif /*IPSEC || FAST_IPSEC*/
 255                                 if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
 256                                         /*
 257                                          * KAME NOTE: do not
 258                                          * m_copy(m, offset, ...) above.
 259                                          * sbappendaddr() expects M_PKTHDR,
 260                                          * and m_copy() will copy M_PKTHDR
 261                                          * only if offset is 0.
 262                                          */
 263                                         if (last->in6p_flags & IN6P_CONTROLOPTS
 264                                             || last->in6p_socket->so_options & SO_TIMESTAMP)
 265                                                 ip6_savecontrol(last, n, &opts);
 266
 267                                         m_adj(n, off + sizeof(struct udphdr));
 268                                         if (sbappendaddr(&last->in6p_socket->so_rcv,
 269                                                         (struct sockaddr *)&fromsa,
 270                                                         n, opts) == 0) {
 271                                                 m_freem(n);
 272                                                 if (opts)
 273                                                         m_freem(opts);
 274                                                 udpstat.udps_fullsock++;
 275                                         } else
 276                                                 sorwakeup(last->in6p_socket);
 277                                         opts = NULL;
 278                                 }
 279                         }
 280                         last = in6p;
 281                         /*
 282                          * Don't look for additional matches if this one does
 283                          * not have either the SO_REUSEPORT or SO_REUSEADDR
 284                          * socket options set.  This heuristic avoids searching
 285                          * through all pcbs in the common case of a non-shared
 286                          * port.  It assumes that an application will never
 287                          * clear these options after setting them.
 288                          */
 289                         if ((last->in6p_socket->so_options &
 290                              (SO_REUSEPORT|SO_REUSEADDR)) == 0)
 291                                 break;
 292                 }
 293
 294                 if (last == NULL) {
 295                         /*
 296                          * No matching pcb found; discard datagram.
 297                          * (No need to send an ICMP Port Unreachable
 298                          * for a broadcast or multicast datgram.)
 299                          */
 300                         udpstat.udps_noport++;
 301                         udpstat.udps_noportmcast++;
 302                         goto bad;
 303                 }
 304 #if defined(IPSEC) || defined(FAST_IPSEC)
 305                 /*
 306                  * Check AH/ESP integrity.
 307                  */
 308                 if (ipsec6_in_reject(m, last)) {
 309 #ifdef IPSEC
 310                         ipsec6stat.in_polvio++;
 311 #endif /* IPSEC */
 312                         goto bad;
 313                 }
 314 #endif /*IPSEC || FAST_IPSEC*/
 315                 if (last->in6p_flags & IN6P_CONTROLOPTS
 316                     || last->in6p_socket->so_options & SO_TIMESTAMP)
 317                         ip6_savecontrol(last, m, &opts);
 318
 319                 m_adj(m, off + sizeof(struct udphdr));
 320                 if (sbappendaddr(&last->in6p_socket->so_rcv,
 321                                 (struct sockaddr *)&fromsa,
 322                                 m, opts) == 0) {
 323                         udpstat.udps_fullsock++;
 324                         goto bad;
 325                 }
 326                 sorwakeup(last->in6p_socket);
 327                 return IPPROTO_DONE;
 328         }
 329         /*
 330          * Locate pcb for datagram.
 331          */
 332         in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
 333                                   &ip6->ip6_dst, uh->uh_dport, 1,
 334                                   m->m_pkthdr.rcvif);
 335         if (in6p == 0) {
 336                 if (log_in_vain) {
 337                         char buf[INET6_ADDRSTRLEN];
 338
 339                         strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
 340                         log(LOG_INFO,
 341                             "Connection attempt to UDP [%s]:%d from [%s]:%d\n",
 342                             buf, ntohs(uh->uh_dport),
 343                             ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
 344                 }
 345                 udpstat.udps_noport++;
 346                 if (m->m_flags & M_MCAST) {
 347                         printf("UDP6: M_MCAST is set in a unicast packet.\n");
 348                         udpstat.udps_noportmcast++;
 349                         goto bad;
 350                 }
 351                 icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
 352                 return IPPROTO_DONE;
 353         }
 354 #if defined(IPSEC) || defined(FAST_IPSEC)
 355         /*
 356          * Check AH/ESP integrity.
 357          */
 358         if (ipsec6_in_reject(m, in6p)) {
 359 #ifdef IPSEC
 360                 ipsec6stat.in_polvio++;
 361 #endif /* IPSEC */
 362                 goto bad;
 363         }
 364 #endif /*IPSEC || FAST_IPSEC*/
 365
 366         /*
 367          * Construct sockaddr format source address.
 368          * Stuff source address and datagram in user buffer.
 369          */
 370         init_sin6(&fromsa, m);
 371         fromsa.sin6_port = uh->uh_sport;
 372         if (in6p->in6p_flags & IN6P_CONTROLOPTS
 373             || in6p->in6p_socket->so_options & SO_TIMESTAMP)
 374                 ip6_savecontrol(in6p, m, &opts);
 375         m_adj(m, off + sizeof(struct udphdr));
 376         if (sbappendaddr(&in6p->in6p_socket->so_rcv,
 377                         (struct sockaddr *)&fromsa, m, opts) == 0) {
 378                 udpstat.udps_fullsock++;
 379                 goto bad;
 380         }
 381         sorwakeup(in6p->in6p_socket);
 382         return IPPROTO_DONE;
 383 bad:
 384         if (m)
 385                 m_freem(m);
 386         if (opts)
 387                 m_freem(opts);
 388         return IPPROTO_DONE;
 389 }
 390
 391 void
 392 udp6_ctlinput(cmd, sa, d)
 393         int cmd;
 394         struct sockaddr *sa;
 395         void *d;
 396 {
 397         struct udphdr uh;
 398         struct ip6_hdr *ip6;
 399         struct mbuf *m;
 400         int off = 0;
 401         struct ip6ctlparam *ip6cp = NULL;
 402         const struct sockaddr_in6 *sa6_src = NULL;
 403         void *cmdarg;
 404         struct inpcb *(*notify)(struct inpcb *, int) = udp_notify;
 405         struct udp_portonly {
 406                 u_int16_t uh_sport;
 407                 u_int16_t uh_dport;
 408         } *uhp;
 409
 410         if (sa->sa_family != AF_INET6 ||
 411             sa->sa_len != sizeof(struct sockaddr_in6))
 412                 return;
 413
 414         if ((unsigned)cmd >= PRC_NCMDS)
 415                 return;
 416         if (PRC_IS_REDIRECT(cmd))
 417                 notify = in6_rtchange, d = NULL;
 418         else if (cmd == PRC_HOSTDEAD)
 419                 d = NULL;
 420         else if (inet6ctlerrmap[cmd] == 0)
 421                 return;
 422
 423         /* if the parameter is from icmp6, decode it. */
 424         if (d != NULL) {
 425                 ip6cp = (struct ip6ctlparam *)d;
 426                 m = ip6cp->ip6c_m;
 427                 ip6 = ip6cp->ip6c_ip6;
 428                 off = ip6cp->ip6c_off;
 429                 cmdarg = ip6cp->ip6c_cmdarg;
 430                 sa6_src = ip6cp->ip6c_src;
 431         } else {
 432                 m = NULL;
 433                 ip6 = NULL;
 434                 cmdarg = NULL;
 435                 sa6_src = &sa6_any;
 436         }
 437
 438         if (ip6) {
 439                 /*
 440                  * XXX: We assume that when IPV6 is non NULL,
 441                  * M and OFF are valid.
 442                  */
 443
 444                 /* check if we can safely examine src and dst ports */
 445                 if (m->m_pkthdr.len < off + sizeof(*uhp))
 446                         return;
 447
 448                 bzero(&uh, sizeof(uh));
 449                 m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
 450
 451                 (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
 452                                      (struct sockaddr *)ip6cp->ip6c_src,
 453                                      uh.uh_sport, cmd, cmdarg, notify);
 454         } else
 455                 (void) in6_pcbnotify(&udbinfo, sa, 0,
 456                                      (const struct sockaddr *)sa6_src,
 457                                      0, cmd, cmdarg, notify);
 458 }
 459
 460 static int
 461 udp6_getcred(SYSCTL_HANDLER_ARGS)
 462 {
 463         struct xucred xuc;
 464         struct sockaddr_in6 addrs[2];
 465         struct inpcb *inp;
 466         int error, s;
 467
 468         error = suser(req->td);
 469         if (error)
 470                 return (error);
 471
 472         if (req->newlen != sizeof(addrs))
 473                 return (EINVAL);
 474         if (req->oldlen != sizeof(struct xucred))
 475                 return (EINVAL);
 476         error = SYSCTL_IN(req, addrs, sizeof(addrs));
 477         if (error)
 478                 return (error);
 479         if ((error = sa6_embedscope(&addrs[0], ip6_use_defzone)) != 0 ||
 480             (error = sa6_embedscope(&addrs[1], ip6_use_defzone)) != 0) {
 481                 return (error);
 482         }
 483         s = splnet();
 484         inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
 485                                  addrs[1].sin6_port,
 486                                  &addrs[0].sin6_addr, addrs[0].sin6_port,
 487                                  1, NULL);
 488         if (!inp || !inp->inp_socket) {
 489                 error = ENOENT;
 490                 goto out;
 491         }
 492         cru2x(inp->inp_socket->so_cred, &xuc);
 493         error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
 494 out:
 495         splx(s);
 496         return (error);
 497 }
 498
 499 SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
 500             0, 0,
 501             udp6_getcred, "S,xucred", "Get the xucred of a UDP6 connection");
 502
 503 static int
 504 udp6_abort(struct socket *so)
 505 {
 506         struct inpcb *inp;
 507         int s;
 508
 509         INP_INFO_WLOCK(&udbinfo);
 510         inp = sotoinpcb(so);
 511         if (inp == 0) {
 512                 INP_INFO_WUNLOCK(&udbinfo);
 513                 return EINVAL;  /* ??? possible? panic instead? */
 514         }
 515         soisdisconnected(so);
 516         s = splnet();
 517         INP_LOCK(inp);
 518         in6_pcbdetach(inp);
 519         INP_INFO_WUNLOCK(&udbinfo);
 520         splx(s);
 521         return 0;
 522 }
 523
 524 static int
 525 udp6_attach(struct socket *so, int proto, struct thread *td)
 526 {
 527         struct inpcb *inp;
 528         int s, error;
 529
 530         INP_INFO_WLOCK(&udbinfo);
 531         inp = sotoinpcb(so);
 532         if (inp != 0) {
 533                 INP_INFO_WUNLOCK(&udbinfo);
 534                 return EINVAL;
 535         }
 536
 537         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 538                 error = soreserve(so, udp_sendspace, udp_recvspace);
 539                 if (error) {
 540                         INP_INFO_WUNLOCK(&udbinfo);
 541                         return error;
 542                 }
 543         }
 544         s = splnet();
 545         error = in_pcballoc(so, &udbinfo);
 546         splx(s);
 547         if (error) {
 548                 INP_INFO_WUNLOCK(&udbinfo);
 549                 return error;
 550         }
 551         inp = (struct inpcb *)so->so_pcb;
 552         INP_INFO_WUNLOCK(&udbinfo);
 553         inp->inp_vflag |= INP_IPV6;
 554         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 555                 inp->inp_vflag |= INP_IPV4;
 556         inp->in6p_hops = -1;    /* use kernel default */
 557         inp->in6p_cksum = -1;   /* just to be sure */
 558         /*
 559          * XXX: ugly!!
 560          * IPv4 TTL initialization is necessary for an IPv6 socket as well,
 561          * because the socket may be bound to an IPv6 wildcard address,
 562          * which may match an IPv4-mapped IPv6 address.
 563          */
 564         inp->inp_ip_ttl = ip_defttl;
 565         INP_UNLOCK(inp);
 566         return 0;
 567 }
 568
 569 static int
 570 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 571 {
 572         struct inpcb *inp;
 573         int s, error;
 574
 575         INP_INFO_WLOCK(&udbinfo);
 576         inp = sotoinpcb(so);
 577         if (inp == 0) {
 578                 INP_INFO_WUNLOCK(&udbinfo);
 579                 return EINVAL;
 580         }
 581         INP_LOCK(inp);
 582
 583         inp->inp_vflag &= ~INP_IPV4;
 584         inp->inp_vflag |= INP_IPV6;
 585         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 586                 struct sockaddr_in6 *sin6_p;
 587
 588                 sin6_p = (struct sockaddr_in6 *)nam;
 589
 590                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
 591                         inp->inp_vflag |= INP_IPV4;
 592                 else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 593                         struct sockaddr_in sin;
 594
 595                         in6_sin6_2_sin(&sin, sin6_p);
 596                         inp->inp_vflag |= INP_IPV4;
 597                         inp->inp_vflag &= ~INP_IPV6;
 598                         s = splnet();
 599                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 600                             td->td_ucred);
 601                         goto out;
 602                 }
 603         }
 604
 605         s = splnet();
 606         error = in6_pcbbind(inp, nam, td->td_ucred);
 607 out:
 608         INP_UNLOCK(inp);
 609         INP_INFO_WUNLOCK(&udbinfo);
 610         splx(s);
 611         return error;
 612 }
 613
 614 static int
 615 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 616 {
 617         struct inpcb *inp;
 618         int s, error;
 619
 620         INP_INFO_WLOCK(&udbinfo);
 621         inp = sotoinpcb(so);
 622         if (inp == 0) {
 623                 INP_INFO_WUNLOCK(&udbinfo);
 624                 return EINVAL;
 625         }
 626         INP_LOCK(inp);
 627
 628         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 629                 struct sockaddr_in6 *sin6_p;
 630
 631                 sin6_p = (struct sockaddr_in6 *)nam;
 632                 if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
 633                         struct sockaddr_in sin;
 634
 635                         if (inp->inp_faddr.s_addr != INADDR_ANY)
 636                                 return EISCONN;
 637                         in6_sin6_2_sin(&sin, sin6_p);
 638                         s = splnet();
 639                         error = in_pcbconnect(inp, (struct sockaddr *)&sin,
 640                             td->td_ucred);
 641                         splx(s);
 642                         if (error == 0) {
 643                                 inp->inp_vflag |= INP_IPV4;
 644                                 inp->inp_vflag &= ~INP_IPV6;
 645                                 soisconnected(so);
 646                         }
 647                         goto out;
 648                 }
 649         }
 650         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 651                 error = EISCONN;
 652                 goto out;
 653         }
 654         s = splnet();
 655         error = in6_pcbconnect(inp, nam, td->td_ucred);
 656         splx(s);
 657         if (error == 0) {
 658                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 659                         /* should be non mapped addr */
 660                         inp->inp_vflag &= ~INP_IPV4;
 661                         inp->inp_vflag |= INP_IPV6;
 662                 }
 663                 soisconnected(so);
 664         }
 665 out:
 666         INP_UNLOCK(inp);
 667         INP_INFO_WUNLOCK(&udbinfo);
 668         return error;
 669 }
 670
 671 static int
 672 udp6_detach(struct socket *so)
 673 {
 674         struct inpcb *inp;
 675         int s;
 676
 677         INP_INFO_WLOCK(&udbinfo);
 678         inp = sotoinpcb(so);
 679         if (inp == 0) {
 680                 INP_INFO_WUNLOCK(&udbinfo);
 681                 return EINVAL;
 682         }
 683         INP_LOCK(inp);
 684         s = splnet();
 685         in6_pcbdetach(inp);
 686         splx(s);
 687         INP_INFO_WUNLOCK(&udbinfo);
 688         return 0;
 689 }
 690
 691 static int
 692 udp6_disconnect(struct socket *so)
 693 {
 694         struct inpcb *inp;
 695         int error, s;
 696
 697         INP_INFO_WLOCK(&udbinfo);
 698         inp = sotoinpcb(so);
 699         if (inp == 0) {
 700                 INP_INFO_WUNLOCK(&udbinfo);
 701                 return EINVAL;
 702         }
 703         INP_LOCK(inp);
 704
 705 #ifdef INET
 706         if (inp->inp_vflag & INP_IPV4) {
 707                 struct pr_usrreqs *pru;
 708
 709                 pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 710                 error = (*pru->pru_disconnect)(so);
 711                 goto out;
 712         }
 713 #endif
 714
 715         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
 716                 error = ENOTCONN;
 717                 goto out;
 718         }
 719
 720         s = splnet();
 721         in6_pcbdisconnect(inp);
 722         inp->in6p_laddr = in6addr_any;
 723         splx(s);
 724         /* XXXRW: so_state locking? */
 725         so->so_state &= ~SS_ISCONNECTED;                /* XXX */
 726 out:
 727         INP_UNLOCK(inp);
 728         INP_INFO_WUNLOCK(&udbinfo);
 729         return 0;
 730 }
 731
 732 static int
 733 udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
 734           struct mbuf *control, struct thread *td)
 735 {
 736         struct inpcb *inp;
 737         int error = 0;
 738
 739         INP_INFO_WLOCK(&udbinfo);
 740         inp = sotoinpcb(so);
 741         if (inp == 0) {
 742                 INP_INFO_WUNLOCK(&udbinfo);
 743                 m_freem(m);
 744                 return EINVAL;
 745         }
 746         INP_LOCK(inp);
 747
 748         if (addr) {
 749                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
 750                         error = EINVAL;
 751                         goto bad;
 752                 }
 753                 if (addr->sa_family != AF_INET6) {
 754                         error = EAFNOSUPPORT;
 755                         goto bad;
 756                 }
 757         }
 758
 759 #ifdef INET
 760         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 761                 int hasv4addr;
 762                 struct sockaddr_in6 *sin6 = 0;
 763
 764                 if (addr == 0)
 765                         hasv4addr = (inp->inp_vflag & INP_IPV4);
 766                 else {
 767                         sin6 = (struct sockaddr_in6 *)addr;
 768                         hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
 769                                 ? 1 : 0;
 770                 }
 771                 if (hasv4addr) {
 772                         struct pr_usrreqs *pru;
 773
 774                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
 775                             !IN6_IS_ADDR_V4MAPPED(&inp->in6p_laddr)) {
 776                                 /*
 777                                  * when remote addr is IPv4-mapped
 778                                  * address, local addr should not be
 779                                  * an IPv6 address; since you cannot
 780                                  * determine how to map IPv6 source
 781                                  * address to IPv4.
 782                                  */
 783                                 error = EINVAL;
 784                                 goto out;
 785                         }
 786                         if (sin6)
 787                                 in6_sin6_2_sin_in_sock(addr);
 788                         pru = inetsw[ip_protox[IPPROTO_UDP]].pr_usrreqs;
 789                         error = ((*pru->pru_send)(so, flags, m, addr, control,
 790                                                   td));
 791                         /* addr will just be freed in sendit(). */
 792                         goto out;
 793                 }
 794         }
 795 #endif
 796
 797         error = udp6_output(inp, m, addr, control, td);
 798 out:
 799         INP_UNLOCK(inp);
 800         INP_INFO_WUNLOCK(&udbinfo);
 801         return error;
 802
 803   bad:
 804         INP_UNLOCK(inp);
 805         INP_INFO_WUNLOCK(&udbinfo);
 806         m_freem(m);
 807         return (error);
 808 }
 809
 810 struct pr_usrreqs udp6_usrreqs = {
 811         .pru_abort =            udp6_abort,
 812         .pru_attach =           udp6_attach,
 813         .pru_bind =             udp6_bind,
 814         .pru_connect =          udp6_connect,
 815         .pru_control =          in6_control,
 816         .pru_detach =           udp6_detach,
 817         .pru_disconnect =       udp6_disconnect,
 818         .pru_peeraddr =         in6_mapped_peeraddr,
 819         .pru_send =             udp6_send,
 820         .pru_shutdown =         udp_shutdown,
 821         .pru_sockaddr =         in6_mapped_sockaddr,
 822         .pru_sosetlabel =       in_pcbsosetlabel
 823 };