sys/netinet6/in6_pcb.c

   1 /*      $FreeBSD$       */
   2 /*      $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $        */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  */
  33
  34 /*
  35  * Copyright (c) 1982, 1986, 1991, 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  *      @(#)in_pcb.c    8.2 (Berkeley) 1/4/94
  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/systm.h>
  75 #include <sys/malloc.h>
  76 #include <sys/mbuf.h>
  77 #include <sys/domain.h>
  78 #include <sys/protosw.h>
  79 #include <sys/socket.h>
  80 #include <sys/socketvar.h>
  81 #include <sys/sockio.h>
  82 #include <sys/errno.h>
  83 #include <sys/time.h>
  84 #include <sys/proc.h>
  85 #include <sys/jail.h>
  86
  87 #include <vm/uma.h>
  88
  89 #include <net/if.h>
  90 #include <net/if_types.h>
  91 #include <net/route.h>
  92
  93 #include <netinet/in.h>
  94 #include <netinet/in_var.h>
  95 #include <netinet/in_systm.h>
  96 #include <netinet/tcp_var.h>
  97 #include <netinet/ip6.h>
  98 #include <netinet/ip_var.h>
  99 #include <netinet6/ip6_var.h>
 100 #include <netinet6/nd6.h>
 101 #include <netinet/in_pcb.h>
 102 #include <netinet6/in6_pcb.h>
 103
 104 #ifdef IPSEC
 105 #include <netinet6/ipsec.h>
 106 #ifdef INET6
 107 #include <netinet6/ipsec6.h>
 108 #endif
 109 #include <netinet6/ah.h>
 110 #ifdef INET6
 111 #include <netinet6/ah6.h>
 112 #endif
 113 #include <netkey/key.h>
 114 #endif /* IPSEC */
 115
 116 struct  in6_addr zeroin6_addr;
 117
 118 int
 119 in6_pcbbind(inp, nam, td)
 120         register struct inpcb *inp;
 121         struct sockaddr *nam;
 122         struct thread *td;
 123 {
 124         struct socket *so = inp->inp_socket;
 125         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
 126         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 127         u_short lport = 0;
 128         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 129
 130         if (!in6_ifaddr) /* XXX broken! */
 131                 return (EADDRNOTAVAIL);
 132         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 133                 return(EINVAL);
 134         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 135                 wild = 1;
 136         if (nam) {
 137                 sin6 = (struct sockaddr_in6 *)nam;
 138                 if (nam->sa_len != sizeof(*sin6))
 139                         return(EINVAL);
 140                 /*
 141                  * family check.
 142                  */
 143                 if (nam->sa_family != AF_INET6)
 144                         return(EAFNOSUPPORT);
 145
 146                 /* KAME hack: embed scopeid */
 147                 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0)
 148                         return EINVAL;
 149                 /* this must be cleared for ifa_ifwithaddr() */
 150                 sin6->sin6_scope_id = 0;
 151
 152                 lport = sin6->sin6_port;
 153                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 154                         /*
 155                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 156                          * allow compepte duplication of binding if
 157                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 158                          * and a multicast address is bound on both
 159                          * new and duplicated sockets.
 160                          */
 161                         if (so->so_options & SO_REUSEADDR)
 162                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 163                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 164                         struct ifaddr *ia = NULL;
 165
 166                         sin6->sin6_port = 0;            /* yech... */
 167                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
 168                                 return(EADDRNOTAVAIL);
 169
 170                         /*
 171                          * XXX: bind to an anycast address might accidentally
 172                          * cause sending a packet with anycast source address.
 173                          * We should allow to bind to a deprecated address, since
 174                          * the application dare to use it.
 175                          */
 176                         if (ia &&
 177                             ((struct in6_ifaddr *)ia)->ia6_flags &
 178                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
 179                                 return(EADDRNOTAVAIL);
 180                         }
 181                 }
 182                 if (lport) {
 183                         struct inpcb *t;
 184
 185                         /* GROSS */
 186                         if (ntohs(lport) < IPV6PORT_RESERVED && td &&
 187                             suser_cred(td->td_ucred, PRISON_ROOT))
 188                                 return(EACCES);
 189                         if (so->so_cred->cr_uid != 0 &&
 190                             !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 191                                 t = in6_pcblookup_local(pcbinfo,
 192                                     &sin6->sin6_addr, lport,
 193                                     INPLOOKUP_WILDCARD);
 194                                 if (t &&
 195                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 196                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 197                                      (t->inp_socket->so_options &
 198                                       SO_REUSEPORT) == 0) &&
 199                                     (so->so_cred->cr_uid !=
 200                                      t->inp_socket->so_cred->cr_uid))
 201                                         return (EADDRINUSE);
 202                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 203                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 204                                         struct sockaddr_in sin;
 205
 206                                         in6_sin6_2_sin(&sin, sin6);
 207                                         t = in_pcblookup_local(pcbinfo,
 208                                                 sin.sin_addr, lport,
 209                                                 INPLOOKUP_WILDCARD);
 210                                         if (t &&
 211                                             (so->so_cred->cr_uid !=
 212                                              t->inp_socket->so_cred->cr_uid) &&
 213                                             (ntohl(t->inp_laddr.s_addr) !=
 214                                              INADDR_ANY ||
 215                                              INP_SOCKAF(so) ==
 216                                              INP_SOCKAF(t->inp_socket)))
 217                                                 return (EADDRINUSE);
 218                                 }
 219                         }
 220                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 221                                                 lport, wild);
 222                         if (t && (reuseport & t->inp_socket->so_options) == 0)
 223                                 return(EADDRINUSE);
 224                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 225                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 226                                 struct sockaddr_in sin;
 227
 228                                 in6_sin6_2_sin(&sin, sin6);
 229                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
 230                                                        lport, wild);
 231                                 if (t &&
 232                                     (reuseport & t->inp_socket->so_options)
 233                                     == 0 &&
 234                                     (ntohl(t->inp_laddr.s_addr)
 235                                      != INADDR_ANY ||
 236                                      INP_SOCKAF(so) ==
 237                                      INP_SOCKAF(t->inp_socket)))
 238                                         return (EADDRINUSE);
 239                         }
 240                 }
 241                 inp->in6p_laddr = sin6->sin6_addr;
 242         }
 243         if (lport == 0) {
 244                 int e;
 245                 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, td)) != 0)
 246                         return(e);
 247         }
 248         else {
 249                 inp->inp_lport = lport;
 250                 if (in_pcbinshash(inp) != 0) {
 251                         inp->in6p_laddr = in6addr_any;
 252                         inp->inp_lport = 0;
 253                         return (EAGAIN);
 254                 }
 255         }
 256         return(0);
 257 }
 258
 259 /*
 260  *   Transform old in6_pcbconnect() into an inner subroutine for new
 261  *   in6_pcbconnect(): Do some validity-checking on the remote
 262  *   address (in mbuf 'nam') and then determine local host address
 263  *   (i.e., which interface) to use to access that remote host.
 264  *
 265  *   This preserves definition of in6_pcbconnect(), while supporting a
 266  *   slightly different version for T/TCP.  (This is more than
 267  *   a bit of a kludge, but cleaning up the internal interfaces would
 268  *   have forced minor changes in every protocol).
 269  */
 270
 271 int
 272 in6_pcbladdr(inp, nam, plocal_addr6)
 273         register struct inpcb *inp;
 274         struct sockaddr *nam;
 275         struct in6_addr **plocal_addr6;
 276 {
 277         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 278         struct ifnet *ifp = NULL;
 279         int error = 0;
 280
 281         if (nam->sa_len != sizeof (*sin6))
 282                 return (EINVAL);
 283         if (sin6->sin6_family != AF_INET6)
 284                 return (EAFNOSUPPORT);
 285         if (sin6->sin6_port == 0)
 286                 return (EADDRNOTAVAIL);
 287
 288         /* KAME hack: embed scopeid */
 289         if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
 290                 return EINVAL;
 291
 292         if (in6_ifaddr) {
 293                 /*
 294                  * If the destination address is UNSPECIFIED addr,
 295                  * use the loopback addr, e.g ::1.
 296                  */
 297                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 298                         sin6->sin6_addr = in6addr_loopback;
 299         }
 300         {
 301                 /*
 302                  * XXX: in6_selectsrc might replace the bound local address
 303                  * with the address specified by setsockopt(IPV6_PKTINFO).
 304                  * Is it the intended behavior?
 305                  */
 306                 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
 307                                               inp->in6p_moptions,
 308                                               &inp->in6p_route,
 309                                               &inp->in6p_laddr, &error);
 310                 if (*plocal_addr6 == 0) {
 311                         if (error == 0)
 312                                 error = EADDRNOTAVAIL;
 313                         return(error);
 314                 }
 315                 /*
 316                  * Don't do pcblookup call here; return interface in
 317                  * plocal_addr6
 318                  * and exit to caller, that will do the lookup.
 319                  */
 320         }
 321
 322         if (inp->in6p_route.ro_rt)
 323                 ifp = inp->in6p_route.ro_rt->rt_ifp;
 324
 325         return(0);
 326 }
 327
 328 /*
 329  * Outer subroutine:
 330  * Connect from a socket to a specified address.
 331  * Both address and port must be specified in argument sin.
 332  * If don't have a local address for this socket yet,
 333  * then pick one.
 334  */
 335 int
 336 in6_pcbconnect(inp, nam, td)
 337         register struct inpcb *inp;
 338         struct sockaddr *nam;
 339         struct thread *td;
 340 {
 341         struct in6_addr *addr6;
 342         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 343         int error;
 344
 345         /*
 346          * Call inner routine, to assign local interface address.
 347          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 348          */
 349         if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
 350                 return(error);
 351
 352         if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
 353                                sin6->sin6_port,
 354                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 355                               ? addr6 : &inp->in6p_laddr,
 356                               inp->inp_lport, 0, NULL) != NULL) {
 357                 return (EADDRINUSE);
 358         }
 359         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 360                 if (inp->inp_lport == 0) {
 361                         error = in6_pcbbind(inp, (struct sockaddr *)0, td);
 362                         if (error)
 363                                 return (error);
 364                 }
 365                 inp->in6p_laddr = *addr6;
 366         }
 367         inp->in6p_faddr = sin6->sin6_addr;
 368         inp->inp_fport = sin6->sin6_port;
 369         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 370         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 371         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
 372                 inp->in6p_flowinfo |=
 373                     (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
 374
 375         in_pcbrehash(inp);
 376         return (0);
 377 }
 378
 379 #if 0
 380 /*
 381  * Return an IPv6 address, which is the most appropriate for given
 382  * destination and user specified options.
 383  * If necessary, this function lookups the routing table and return
 384  * an entry to the caller for later use.
 385  */
 386 struct in6_addr *
 387 in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp)
 388         struct sockaddr_in6 *dstsock;
 389         struct ip6_pktopts *opts;
 390         struct ip6_moptions *mopts;
 391         struct route_in6 *ro;
 392         struct in6_addr *laddr;
 393         int *errorp;
 394 {
 395         struct in6_addr *dst;
 396         struct in6_ifaddr *ia6 = 0;
 397         struct in6_pktinfo *pi = NULL;
 398
 399         dst = &dstsock->sin6_addr;
 400         *errorp = 0;
 401
 402         /*
 403          * If the source address is explicitly specified by the caller,
 404          * use it.
 405          */
 406         if (opts && (pi = opts->ip6po_pktinfo) &&
 407             !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr))
 408                 return(&pi->ipi6_addr);
 409
 410         /*
 411          * If the source address is not specified but the socket(if any)
 412          * is already bound, use the bound address.
 413          */
 414         if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr))
 415                 return(laddr);
 416
 417         /*
 418          * If the caller doesn't specify the source address but
 419          * the outgoing interface, use an address associated with
 420          * the interface.
 421          */
 422         if (pi && pi->ipi6_ifindex) {
 423                 /* XXX boundary check is assumed to be already done. */
 424                 ia6 = in6_ifawithscope(ifnet_byindex(pi->ipi6_ifindex), dst);
 425                 if (ia6 == 0) {
 426                         *errorp = EADDRNOTAVAIL;
 427                         return(0);
 428                 }
 429                 return(&satosin6(&ia6->ia_addr)->sin6_addr);
 430         }
 431
 432         /*
 433          * If the destination address is a link-local unicast address or
 434          * a multicast address, and if the outgoing interface is specified
 435          * by the sin6_scope_id filed, use an address associated with the
 436          * interface.
 437          * XXX: We're now trying to define more specific semantics of
 438          *      sin6_scope_id field, so this part will be rewritten in
 439          *      the near future.
 440          */
 441         if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
 442             dstsock->sin6_scope_id) {
 443                 /*
 444                  * I'm not sure if boundary check for scope_id is done
 445                  * somewhere...
 446                  */
 447                 if (dstsock->sin6_scope_id < 0 ||
 448                     if_index < dstsock->sin6_scope_id) {
 449                         *errorp = ENXIO; /* XXX: better error? */
 450                         return(0);
 451                 }
 452                 ia6 = in6_ifawithscope(ifnet_byindex(dstsock->sin6_scope_id),
 453                                        dst);
 454                 if (ia6 == 0) {
 455                         *errorp = EADDRNOTAVAIL;
 456                         return(0);
 457                 }
 458                 return(&satosin6(&ia6->ia_addr)->sin6_addr);
 459         }
 460
 461         /*
 462          * If the destination address is a multicast address and
 463          * the outgoing interface for the address is specified
 464          * by the caller, use an address associated with the interface.
 465          * There is a sanity check here; if the destination has node-local
 466          * scope, the outgoing interfacde should be a loopback address.
 467          * Even if the outgoing interface is not specified, we also
 468          * choose a loopback interface as the outgoing interface.
 469          */
 470         if (IN6_IS_ADDR_MULTICAST(dst)) {
 471                 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
 472
 473                 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
 474                         ifp = &loif[0];
 475                 }
 476
 477                 if (ifp) {
 478                         ia6 = in6_ifawithscope(ifp, dst);
 479                         if (ia6 == 0) {
 480                                 *errorp = EADDRNOTAVAIL;
 481                                 return(0);
 482                         }
 483                         return(&ia6->ia_addr.sin6_addr);
 484                 }
 485         }
 486
 487         /*
 488          * If the next hop address for the packet is specified
 489          * by caller, use an address associated with the route
 490          * to the next hop.
 491          */
 492         {
 493                 struct sockaddr_in6 *sin6_next;
 494                 struct rtentry *rt;
 495
 496                 if (opts && opts->ip6po_nexthop) {
 497                         sin6_next = satosin6(opts->ip6po_nexthop);
 498                         rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
 499                         if (rt) {
 500                                 ia6 = in6_ifawithscope(rt->rt_ifp, dst);
 501                                 if (ia6 == 0)
 502                                         ia6 = ifatoia6(rt->rt_ifa);
 503                         }
 504                         if (ia6 == 0) {
 505                                 *errorp = EADDRNOTAVAIL;
 506                                 return(0);
 507                         }
 508                         return(&satosin6(&ia6->ia_addr)->sin6_addr);
 509                 }
 510         }
 511
 512         /*
 513          * If route is known or can be allocated now,
 514          * our src addr is taken from the i/f, else punt.
 515          */
 516         if (ro) {
 517                 if (ro->ro_rt &&
 518                     !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
 519                         RTFREE(ro->ro_rt);
 520                         ro->ro_rt = (struct rtentry *)0;
 521                 }
 522                 if (ro->ro_rt == (struct rtentry *)0 ||
 523                     ro->ro_rt->rt_ifp == (struct ifnet *)0) {
 524                         struct sockaddr_in6 *dst6;
 525
 526                         /* No route yet, so try to acquire one */
 527                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
 528                         dst6 = (struct sockaddr_in6 *)&ro->ro_dst;
 529                         dst6->sin6_family = AF_INET6;
 530                         dst6->sin6_len = sizeof(struct sockaddr_in6);
 531                         dst6->sin6_addr = *dst;
 532                         if (IN6_IS_ADDR_MULTICAST(dst)) {
 533                                 ro->ro_rt = rtalloc1(&((struct route *)ro)
 534                                                      ->ro_dst, 0, 0UL);
 535                         } else {
 536                                 rtalloc((struct route *)ro);
 537                         }
 538                 }
 539
 540                 /*
 541                  * in_pcbconnect() checks out IFF_LOOPBACK to skip using
 542                  * the address. But we don't know why it does so.
 543                  * It is necessary to ensure the scope even for lo0
 544                  * so doesn't check out IFF_LOOPBACK.
 545                  */
 546
 547                 if (ro->ro_rt) {
 548                         ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst);
 549                         if (ia6 == 0) /* xxx scope error ?*/
 550                                 ia6 = ifatoia6(ro->ro_rt->rt_ifa);
 551                 }
 552                 if (ia6 == 0) {
 553                         *errorp = EHOSTUNREACH; /* no route */
 554                         return(0);
 555                 }
 556                 return(&satosin6(&ia6->ia_addr)->sin6_addr);
 557         }
 558
 559         *errorp = EADDRNOTAVAIL;
 560         return(0);
 561 }
 562
 563 /*
 564  * Default hop limit selection. The precedence is as follows:
 565  * 1. Hoplimit valued specified via ioctl.
 566  * 2. (If the outgoing interface is detected) the current
 567  *     hop limit of the interface specified by router advertisement.
 568  * 3. The system default hoplimit.
 569 */
 570 int
 571 in6_selecthlim(in6p, ifp)
 572         struct in6pcb *in6p;
 573         struct ifnet *ifp;
 574 {
 575         if (in6p && in6p->in6p_hops >= 0)
 576                 return(in6p->in6p_hops);
 577         else if (ifp)
 578                 return(nd_ifinfo[ifp->if_index].chlim);
 579         else
 580                 return(ip6_defhlim);
 581 }
 582 #endif
 583
 584 void
 585 in6_pcbdisconnect(inp)
 586         struct inpcb *inp;
 587 {
 588         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 589         inp->inp_fport = 0;
 590         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 591         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 592         in_pcbrehash(inp);
 593         if (inp->inp_socket->so_state & SS_NOFDREF)
 594                 in6_pcbdetach(inp);
 595 }
 596
 597 void
 598 in6_pcbdetach(inp)
 599         struct inpcb *inp;
 600 {
 601         struct socket *so = inp->inp_socket;
 602         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 603
 604 #ifdef IPSEC
 605         if (inp->in6p_sp != NULL)
 606                 ipsec6_delete_pcbpolicy(inp);
 607 #endif /* IPSEC */
 608         inp->inp_gencnt = ++ipi->ipi_gencnt;
 609         in_pcbremlists(inp);
 610         sotoinpcb(so) = 0;
 611         sotryfree(so);
 612
 613         if (inp->in6p_options)
 614                 m_freem(inp->in6p_options);
 615         ip6_freepcbopts(inp->in6p_outputopts);
 616         ip6_freemoptions(inp->in6p_moptions);
 617         if (inp->in6p_route.ro_rt)
 618                 rtfree(inp->in6p_route.ro_rt);
 619         /* Check and free IPv4 related resources in case of mapped addr */
 620         if (inp->inp_options)
 621                 (void)m_free(inp->inp_options);
 622         ip_freemoptions(inp->inp_moptions);
 623
 624         inp->inp_vflag = 0;
 625         INP_LOCK_DESTROY(inp);
 626         uma_zfree(ipi->ipi_zone, inp);
 627 }
 628
 629 /*
 630  * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
 631  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 632  * in struct pr_usrreqs, so that protocols can just reference then directly
 633  * without the need for a wrapper function.  The socket must have a valid
 634  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 635  * except through a kernel programming error, so it is acceptable to panic
 636  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 637  * because there actually /is/ a programming error somewhere... XXX)
 638  */
 639 int
 640 in6_setsockaddr(so, nam)
 641         struct socket *so;
 642         struct sockaddr **nam;
 643 {
 644         int s;
 645         register struct inpcb *inp;
 646         register struct sockaddr_in6 *sin6;
 647
 648         /*
 649          * Do the malloc first in case it blocks.
 650          */
 651         MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK);
 652         bzero(sin6, sizeof *sin6);
 653         sin6->sin6_family = AF_INET6;
 654         sin6->sin6_len = sizeof(*sin6);
 655
 656         s = splnet();
 657         inp = sotoinpcb(so);
 658         if (!inp) {
 659                 splx(s);
 660                 free(sin6, M_SONAME);
 661                 return EINVAL;
 662         }
 663         sin6->sin6_port = inp->inp_lport;
 664         sin6->sin6_addr = inp->in6p_laddr;
 665         splx(s);
 666         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 667                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 668         else
 669                 sin6->sin6_scope_id = 0;        /*XXX*/
 670         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 671                 sin6->sin6_addr.s6_addr16[1] = 0;
 672
 673         *nam = (struct sockaddr *)sin6;
 674         return 0;
 675 }
 676
 677 int
 678 in6_setpeeraddr(so, nam)
 679         struct socket *so;
 680         struct sockaddr **nam;
 681 {
 682         int s;
 683         struct inpcb *inp;
 684         register struct sockaddr_in6 *sin6;
 685
 686         /*
 687          * Do the malloc first in case it blocks.
 688          */
 689         MALLOC(sin6, struct sockaddr_in6 *, sizeof(*sin6), M_SONAME, M_WAITOK);
 690         bzero((caddr_t)sin6, sizeof (*sin6));
 691         sin6->sin6_family = AF_INET6;
 692         sin6->sin6_len = sizeof(struct sockaddr_in6);
 693
 694         s = splnet();
 695         inp = sotoinpcb(so);
 696         if (!inp) {
 697                 splx(s);
 698                 free(sin6, M_SONAME);
 699                 return EINVAL;
 700         }
 701         sin6->sin6_port = inp->inp_fport;
 702         sin6->sin6_addr = inp->in6p_faddr;
 703         splx(s);
 704         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 705                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 706         else
 707                 sin6->sin6_scope_id = 0;        /*XXX*/
 708         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 709                 sin6->sin6_addr.s6_addr16[1] = 0;
 710
 711         *nam = (struct sockaddr *)sin6;
 712         return 0;
 713 }
 714
 715 int
 716 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 717 {
 718         struct  inpcb *inp = sotoinpcb(so);
 719         int     error;
 720
 721         if (inp == NULL)
 722                 return EINVAL;
 723         if (inp->inp_vflag & INP_IPV4) {
 724                 error = in_setsockaddr(so, nam, &tcbinfo);
 725                 if (error == 0)
 726                         in6_sin_2_v4mapsin6_in_sock(nam);
 727         } else
 728         /* scope issues will be handled in in6_setsockaddr(). */
 729         error = in6_setsockaddr(so, nam);
 730
 731         return error;
 732 }
 733
 734 int
 735 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 736 {
 737         struct  inpcb *inp = sotoinpcb(so);
 738         int     error;
 739
 740         if (inp == NULL)
 741                 return EINVAL;
 742         if (inp->inp_vflag & INP_IPV4) {
 743                 error = in_setpeeraddr(so, nam, &tcbinfo);
 744                 if (error == 0)
 745                         in6_sin_2_v4mapsin6_in_sock(nam);
 746         } else
 747         /* scope issues will be handled in in6_setpeeraddr(). */
 748         error = in6_setpeeraddr(so, nam);
 749
 750         return error;
 751 }
 752
 753 /*
 754  * Pass some notification to all connections of a protocol
 755  * associated with address dst.  The local address and/or port numbers
 756  * may be specified to limit the search.  The "usual action" will be
 757  * taken, depending on the ctlinput cmd.  The caller must filter any
 758  * cmds that are uninteresting (e.g., no error in the map).
 759  * Call the protocol specific routine (if any) to report
 760  * any errors for each matching socket.
 761  *
 762  * Must be called at splnet.
 763  */
 764 void
 765 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, notify)
 766         struct inpcbhead *head;
 767         struct sockaddr *dst;
 768         const struct sockaddr *src;
 769         u_int fport_arg, lport_arg;
 770         int cmd;
 771         struct inpcb *(*notify) __P((struct inpcb *, int));
 772 {
 773         struct inpcb *inp, *ninp;
 774         struct sockaddr_in6 sa6_src, *sa6_dst;
 775         u_short fport = fport_arg, lport = lport_arg;
 776         u_int32_t flowinfo;
 777         int errno, s;
 778
 779         if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6)
 780                 return;
 781
 782         sa6_dst = (struct sockaddr_in6 *)dst;
 783         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 784                 return;
 785
 786         /*
 787          * note that src can be NULL when we get notify by local fragmentation.
 788          */
 789         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 790         flowinfo = sa6_src.sin6_flowinfo;
 791
 792         /*
 793          * Redirects go to all references to the destination,
 794          * and use in6_rtchange to invalidate the route cache.
 795          * Dead host indications: also use in6_rtchange to invalidate
 796          * the cache, and deliver the error to all the sockets.
 797          * Otherwise, if we have knowledge of the local port and address,
 798          * deliver only to that socket.
 799          */
 800         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 801                 fport = 0;
 802                 lport = 0;
 803                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 804
 805                 if (cmd != PRC_HOSTDEAD)
 806                         notify = in6_rtchange;
 807         }
 808         errno = inet6ctlerrmap[cmd];
 809         s = splnet();
 810         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 811                 ninp = LIST_NEXT(inp, inp_list);
 812
 813                 if ((inp->inp_vflag & INP_IPV6) == 0)
 814                         continue;
 815
 816                 /*
 817                  * Detect if we should notify the error. If no source and
 818                  * destination ports are specifed, but non-zero flowinfo and
 819                  * local address match, notify the error. This is the case
 820                  * when the error is delivered with an encrypted buffer
 821                  * by ESP. Otherwise, just compare addresses and ports
 822                  * as usual.
 823                  */
 824                 if (lport == 0 && fport == 0 && flowinfo &&
 825                     inp->inp_socket != NULL &&
 826                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
 827                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 828                         goto do_notify;
 829                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 830                                              &sa6_dst->sin6_addr) ||
 831                          inp->inp_socket == 0 ||
 832                          (lport && inp->inp_lport != lport) ||
 833                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 834                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 835                                               &sa6_src.sin6_addr)) ||
 836                          (fport && inp->inp_fport != fport))
 837                         continue;
 838
 839           do_notify:
 840                 if (notify)
 841                         (*notify)(inp, errno);
 842         }
 843         splx(s);
 844 }
 845
 846 /*
 847  * Lookup a PCB based on the local address and port.
 848  */
 849 struct inpcb *
 850 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
 851         struct inpcbinfo *pcbinfo;
 852         struct in6_addr *laddr;
 853         u_int lport_arg;
 854         int wild_okay;
 855 {
 856         register struct inpcb *inp;
 857         int matchwild = 3, wildcard;
 858         u_short lport = lport_arg;
 859
 860         if (!wild_okay) {
 861                 struct inpcbhead *head;
 862                 /*
 863                  * Look for an unconnected (wildcard foreign addr) PCB that
 864                  * matches the local address and port we're looking for.
 865                  */
 866                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
 867                                                       pcbinfo->hashmask)];
 868                 LIST_FOREACH(inp, head, inp_hash) {
 869                         if ((inp->inp_vflag & INP_IPV6) == 0)
 870                                 continue;
 871                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 872                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 873                             inp->inp_lport == lport) {
 874                                 /*
 875                                  * Found.
 876                                  */
 877                                 return (inp);
 878                         }
 879                 }
 880                 /*
 881                  * Not found.
 882                  */
 883                 return (NULL);
 884         } else {
 885                 struct inpcbporthead *porthash;
 886                 struct inpcbport *phd;
 887                 struct inpcb *match = NULL;
 888                 /*
 889                  * Best fit PCB lookup.
 890                  *
 891                  * First see if this local port is in use by looking on the
 892                  * port hash list.
 893                  */
 894                 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 895                     pcbinfo->porthashmask)];
 896                 LIST_FOREACH(phd, porthash, phd_hash) {
 897                         if (phd->phd_port == lport)
 898                                 break;
 899                 }
 900                 if (phd != NULL) {
 901                         /*
 902                          * Port is in use by one or more PCBs. Look for best
 903                          * fit.
 904                          */
 905                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 906                                 wildcard = 0;
 907                                 if ((inp->inp_vflag & INP_IPV6) == 0)
 908                                         continue;
 909                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 910                                         wildcard++;
 911                                 if (!IN6_IS_ADDR_UNSPECIFIED(
 912                                         &inp->in6p_laddr)) {
 913                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 914                                                 wildcard++;
 915                                         else if (!IN6_ARE_ADDR_EQUAL(
 916                                                 &inp->in6p_laddr, laddr))
 917                                                 continue;
 918                                 } else {
 919                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 920                                                 wildcard++;
 921                                 }
 922                                 if (wildcard < matchwild) {
 923                                         match = inp;
 924                                         matchwild = wildcard;
 925                                         if (matchwild == 0) {
 926                                                 break;
 927                                         }
 928                                 }
 929                         }
 930                 }
 931                 return (match);
 932         }
 933 }
 934
 935 void
 936 in6_pcbpurgeif0(head, ifp)
 937         struct in6pcb *head;
 938         struct ifnet *ifp;
 939 {
 940         struct in6pcb *in6p;
 941         struct ip6_moptions *im6o;
 942         struct in6_multi_mship *imm, *nimm;
 943
 944         for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
 945                 im6o = in6p->in6p_moptions;
 946                 if ((in6p->inp_vflag & INP_IPV6) &&
 947                     im6o) {
 948                         /*
 949                          * Unselect the outgoing interface if it is being
 950                          * detached.
 951                          */
 952                         if (im6o->im6o_multicast_ifp == ifp)
 953                                 im6o->im6o_multicast_ifp = NULL;
 954
 955                         /*
 956                          * Drop multicast group membership if we joined
 957                          * through the interface being detached.
 958                          * XXX controversial - is it really legal for kernel
 959                          * to force this?
 960                          */
 961                         for (imm = im6o->im6o_memberships.lh_first;
 962                              imm != NULL; imm = nimm) {
 963                                 nimm = imm->i6mm_chain.le_next;
 964                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
 965                                         LIST_REMOVE(imm, i6mm_chain);
 966                                         in6_delmulti(imm->i6mm_maddr);
 967                                         free(imm, M_IPMADDR);
 968                                 }
 969                         }
 970                 }
 971         }
 972 }
 973
 974 /*
 975  * Check for alternatives when higher level complains
 976  * about service problems.  For now, invalidate cached
 977  * routing information.  If the route was created dynamically
 978  * (by a redirect), time to try a default gateway again.
 979  */
 980 void
 981 in6_losing(in6p)
 982         struct inpcb *in6p;
 983 {
 984         struct rtentry *rt;
 985         struct rt_addrinfo info;
 986
 987         if ((rt = in6p->in6p_route.ro_rt) != NULL) {
 988                 bzero((caddr_t)&info, sizeof(info));
 989                 info.rti_flags = rt->rt_flags;
 990                 info.rti_info[RTAX_DST] = rt_key(rt);
 991                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 992                 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 993                 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
 994                 if (rt->rt_flags & RTF_DYNAMIC)
 995                         (void)rtrequest1(RTM_DELETE, &info, NULL);
 996                 in6p->in6p_route.ro_rt = NULL;
 997                 rtfree(rt);
 998                 /*
 999                  * A new route can be allocated
1000                  * the next time output is attempted.
1001                  */
1002         }
1003 }
1004
1005 /*
1006  * After a routing change, flush old routing
1007  * and allocate a (hopefully) better one.
1008  */
1009 struct inpcb *
1010 in6_rtchange(inp, errno)
1011         struct inpcb *inp;
1012         int errno;
1013 {
1014         if (inp->in6p_route.ro_rt) {
1015                 rtfree(inp->in6p_route.ro_rt);
1016                 inp->in6p_route.ro_rt = 0;
1017                 /*
1018                  * A new route can be allocated the next time
1019                  * output is attempted.
1020                  */
1021         }
1022         return inp;
1023 }
1024
1025 /*
1026  * Lookup PCB in hash list.
1027  */
1028 struct inpcb *
1029 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp)
1030         struct inpcbinfo *pcbinfo;
1031         struct in6_addr *faddr, *laddr;
1032         u_int fport_arg, lport_arg;
1033         int wildcard;
1034         struct ifnet *ifp;
1035 {
1036         struct inpcbhead *head;
1037         register struct inpcb *inp;
1038         u_short fport = fport_arg, lport = lport_arg;
1039         int faith;
1040
1041         if (faithprefix_p != NULL)
1042                 faith = (*faithprefix_p)(laddr);
1043         else
1044                 faith = 0;
1045
1046         /*
1047          * First look for an exact match.
1048          */
1049         head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */,
1050                                               lport, fport,
1051                                               pcbinfo->hashmask)];
1052         LIST_FOREACH(inp, head, inp_hash) {
1053                 if ((inp->inp_vflag & INP_IPV6) == 0)
1054                         continue;
1055                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1056                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1057                     inp->inp_fport == fport &&
1058                     inp->inp_lport == lport) {
1059                         /*
1060                          * Found.
1061                          */
1062                         return (inp);
1063                 }
1064         }
1065         if (wildcard) {
1066                 struct inpcb *local_wild = NULL;
1067
1068                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
1069                                                       pcbinfo->hashmask)];
1070                 LIST_FOREACH(inp, head, inp_hash) {
1071                         if ((inp->inp_vflag & INP_IPV6) == 0)
1072                                 continue;
1073                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1074                             inp->inp_lport == lport) {
1075                                 if (faith && (inp->inp_flags & INP_FAITH) == 0)
1076                                         continue;
1077                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
1078                                                        laddr))
1079                                         return (inp);
1080                                 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1081                                         local_wild = inp;
1082                         }
1083                 }
1084                 return (local_wild);
1085         }
1086
1087         /*
1088          * Not found.
1089          */
1090         return (NULL);
1091 }
1092
1093 void
1094 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
1095 {
1096         struct ip6_hdr *ip;
1097
1098         ip = mtod(m, struct ip6_hdr *);
1099         bzero(sin6, sizeof(*sin6));
1100         sin6->sin6_len = sizeof(*sin6);
1101         sin6->sin6_family = AF_INET6;
1102         sin6->sin6_addr = ip->ip6_src;
1103         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1104                 sin6->sin6_addr.s6_addr16[1] = 0;
1105         sin6->sin6_scope_id =
1106                 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1107                 ? m->m_pkthdr.rcvif->if_index : 0;
1108
1109         return;
1110 }