sys/netinet6/in6_pcb.c

   1 /*      $FreeBSD: src/sys/netinet6/in6_pcb.c,v 1.10.2.9 2003/01/24 05:11:35 sam Exp $   */
   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/vm_zone.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/ip6.h>
  97 #include <netinet/ip_var.h>
  98 #include <netinet6/ip6_var.h>
  99 #include <netinet6/nd6.h>
 100 #include <netinet/in_pcb.h>
 101 #include <netinet6/in6_pcb.h>
 102
 103 #ifdef IPSEC
 104 #include <netinet6/ipsec.h>
 105 #ifdef INET6
 106 #include <netinet6/ipsec6.h>
 107 #endif
 108 #include <netinet6/ah.h>
 109 #ifdef INET6
 110 #include <netinet6/ah6.h>
 111 #endif
 112 #include <netkey/key.h>
 113 #endif /* IPSEC */
 114
 115 #ifdef FAST_IPSEC
 116 #include <netipsec/ipsec.h>
 117 #include <netipsec/ipsec6.h>
 118 #include <netipsec/key.h>
 119 #define IPSEC
 120 #endif /* FAST_IPSEC */
 121
 122 struct  in6_addr zeroin6_addr;
 123
 124 int
 125 in6_pcbbind(inp, nam, p)
 126         register struct inpcb *inp;
 127         struct sockaddr *nam;
 128         struct proc *p;
 129 {
 130         struct socket *so = inp->inp_socket;
 131         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
 132         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 133         u_short lport = 0;
 134         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 135
 136         if (!in6_ifaddr) /* XXX broken! */
 137                 return (EADDRNOTAVAIL);
 138         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 139                 return(EINVAL);
 140         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 141                 wild = 1;
 142         if (nam) {
 143                 sin6 = (struct sockaddr_in6 *)nam;
 144                 if (nam->sa_len != sizeof(*sin6))
 145                         return(EINVAL);
 146                 /*
 147                  * family check.
 148                  */
 149                 if (nam->sa_family != AF_INET6)
 150                         return(EAFNOSUPPORT);
 151
 152                 /* KAME hack: embed scopeid */
 153                 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0)
 154                         return EINVAL;
 155                 /* this must be cleared for ifa_ifwithaddr() */
 156                 sin6->sin6_scope_id = 0;
 157
 158                 lport = sin6->sin6_port;
 159                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 160                         /*
 161                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 162                          * allow compepte duplication of binding if
 163                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 164                          * and a multicast address is bound on both
 165                          * new and duplicated sockets.
 166                          */
 167                         if (so->so_options & SO_REUSEADDR)
 168                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 169                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 170                         struct ifaddr *ia = NULL;
 171
 172                         sin6->sin6_port = 0;            /* yech... */
 173                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
 174                                 return(EADDRNOTAVAIL);
 175
 176                         /*
 177                          * XXX: bind to an anycast address might accidentally
 178                          * cause sending a packet with anycast source address.
 179                          * We should allow to bind to a deprecated address, since
 180                          * the application dare to use it.
 181                          */
 182                         if (ia &&
 183                             ((struct in6_ifaddr *)ia)->ia6_flags &
 184                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
 185                                 return(EADDRNOTAVAIL);
 186                         }
 187                 }
 188                 if (lport) {
 189                         struct inpcb *t;
 190
 191                         /* GROSS */
 192                         if (ntohs(lport) < IPV6PORT_RESERVED && p &&
 193                             suser_xxx(0, p, PRISON_ROOT))
 194                                 return(EACCES);
 195                         if (so->so_cred->cr_uid != 0 &&
 196                             !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 197                                 t = in6_pcblookup_local(pcbinfo,
 198                                     &sin6->sin6_addr, lport,
 199                                     INPLOOKUP_WILDCARD);
 200                                 if (t &&
 201                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 202                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 203                                      (t->inp_socket->so_options &
 204                                       SO_REUSEPORT) == 0) &&
 205                                     (so->so_cred->cr_uid !=
 206                                      t->inp_socket->so_cred->cr_uid))
 207                                         return (EADDRINUSE);
 208                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 209                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 210                                         struct sockaddr_in sin;
 211
 212                                         in6_sin6_2_sin(&sin, sin6);
 213                                         t = in_pcblookup_local(pcbinfo,
 214                                                 sin.sin_addr, lport,
 215                                                 INPLOOKUP_WILDCARD);
 216                                         if (t &&
 217                                             (so->so_cred->cr_uid !=
 218                                              t->inp_socket->so_cred->cr_uid) &&
 219                                             (ntohl(t->inp_laddr.s_addr) !=
 220                                              INADDR_ANY ||
 221                                              INP_SOCKAF(so) ==
 222                                              INP_SOCKAF(t->inp_socket)))
 223                                                 return (EADDRINUSE);
 224                                 }
 225                         }
 226                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 227                                                 lport, wild);
 228                         if (t && (reuseport & t->inp_socket->so_options) == 0)
 229                                 return(EADDRINUSE);
 230                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 231                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 232                                 struct sockaddr_in sin;
 233
 234                                 in6_sin6_2_sin(&sin, sin6);
 235                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
 236                                                        lport, wild);
 237                                 if (t &&
 238                                     (reuseport & t->inp_socket->so_options)
 239                                     == 0 &&
 240                                     (ntohl(t->inp_laddr.s_addr)
 241                                      != INADDR_ANY ||
 242                                      INP_SOCKAF(so) ==
 243                                      INP_SOCKAF(t->inp_socket)))
 244                                         return (EADDRINUSE);
 245                         }
 246                 }
 247                 inp->in6p_laddr = sin6->sin6_addr;
 248         }
 249         if (lport == 0) {
 250                 int e;
 251                 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, p)) != 0)
 252                         return(e);
 253         }
 254         else {
 255                 inp->inp_lport = lport;
 256                 if (in_pcbinshash(inp) != 0) {
 257                         inp->in6p_laddr = in6addr_any;
 258                         inp->inp_lport = 0;
 259                         return (EAGAIN);
 260                 }
 261         }
 262         return(0);
 263 }
 264
 265 /*
 266  *   Transform old in6_pcbconnect() into an inner subroutine for new
 267  *   in6_pcbconnect(): Do some validity-checking on the remote
 268  *   address (in mbuf 'nam') and then determine local host address
 269  *   (i.e., which interface) to use to access that remote host.
 270  *
 271  *   This preserves definition of in6_pcbconnect(), while supporting a
 272  *   slightly different version for T/TCP.  (This is more than
 273  *   a bit of a kludge, but cleaning up the internal interfaces would
 274  *   have forced minor changes in every protocol).
 275  */
 276
 277 int
 278 in6_pcbladdr(inp, nam, plocal_addr6)
 279         register struct inpcb *inp;
 280         struct sockaddr *nam;
 281         struct in6_addr **plocal_addr6;
 282 {
 283         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 284         struct ifnet *ifp = NULL;
 285         int error = 0;
 286
 287         if (nam->sa_len != sizeof (*sin6))
 288                 return (EINVAL);
 289         if (sin6->sin6_family != AF_INET6)
 290                 return (EAFNOSUPPORT);
 291         if (sin6->sin6_port == 0)
 292                 return (EADDRNOTAVAIL);
 293
 294         /* KAME hack: embed scopeid */
 295         if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
 296                 return EINVAL;
 297
 298         if (in6_ifaddr) {
 299                 /*
 300                  * If the destination address is UNSPECIFIED addr,
 301                  * use the loopback addr, e.g ::1.
 302                  */
 303                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 304                         sin6->sin6_addr = in6addr_loopback;
 305         }
 306         {
 307                 /*
 308                  * XXX: in6_selectsrc might replace the bound local address
 309                  * with the address specified by setsockopt(IPV6_PKTINFO).
 310                  * Is it the intended behavior?
 311                  */
 312                 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
 313                                               inp->in6p_moptions,
 314                                               &inp->in6p_route,
 315                                               &inp->in6p_laddr, &error);
 316                 if (*plocal_addr6 == 0) {
 317                         if (error == 0)
 318                                 error = EADDRNOTAVAIL;
 319                         return(error);
 320                 }
 321                 /*
 322                  * Don't do pcblookup call here; return interface in
 323                  * plocal_addr6
 324                  * and exit to caller, that will do the lookup.
 325                  */
 326         }
 327
 328         if (inp->in6p_route.ro_rt)
 329                 ifp = inp->in6p_route.ro_rt->rt_ifp;
 330
 331         return(0);
 332 }
 333
 334 /*
 335  * Outer subroutine:
 336  * Connect from a socket to a specified address.
 337  * Both address and port must be specified in argument sin.
 338  * If don't have a local address for this socket yet,
 339  * then pick one.
 340  */
 341 int
 342 in6_pcbconnect(inp, nam, p)
 343         register struct inpcb *inp;
 344         struct sockaddr *nam;
 345         struct proc *p;
 346 {
 347         struct in6_addr *addr6;
 348         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 349         int error;
 350
 351         /*
 352          * Call inner routine, to assign local interface address.
 353          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 354          */
 355         if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
 356                 return(error);
 357
 358         if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
 359                                sin6->sin6_port,
 360                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 361                               ? addr6 : &inp->in6p_laddr,
 362                               inp->inp_lport, 0, NULL) != NULL) {
 363                 return (EADDRINUSE);
 364         }
 365         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 366                 if (inp->inp_lport == 0) {
 367                         error = in6_pcbbind(inp, (struct sockaddr *)0, p);
 368                         if (error)
 369                                 return (error);
 370                 }
 371                 inp->in6p_laddr = *addr6;
 372         }
 373         inp->in6p_faddr = sin6->sin6_addr;
 374         inp->inp_fport = sin6->sin6_port;
 375         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 376         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 377         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
 378                 inp->in6p_flowinfo |=
 379                     (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
 380
 381         in_pcbrehash(inp);
 382         return (0);
 383 }
 384
 385 #if 0
 386 /*
 387  * Return an IPv6 address, which is the most appropriate for given
 388  * destination and user specified options.
 389  * If necessary, this function lookups the routing table and return
 390  * an entry to the caller for later use.
 391  */
 392 struct in6_addr *
 393 in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp)
 394         struct sockaddr_in6 *dstsock;
 395         struct ip6_pktopts *opts;
 396         struct ip6_moptions *mopts;
 397         struct route_in6 *ro;
 398         struct in6_addr *laddr;
 399         int *errorp;
 400 {
 401         struct in6_addr *dst;
 402         struct in6_ifaddr *ia6 = 0;
 403         struct in6_pktinfo *pi = NULL;
 404
 405         dst = &dstsock->sin6_addr;
 406         *errorp = 0;
 407
 408         /*
 409          * If the source address is explicitly specified by the caller,
 410          * use it.
 411          */
 412         if (opts && (pi = opts->ip6po_pktinfo) &&
 413             !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr))
 414                 return(&pi->ipi6_addr);
 415
 416         /*
 417          * If the source address is not specified but the socket(if any)
 418          * is already bound, use the bound address.
 419          */
 420         if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr))
 421                 return(laddr);
 422
 423         /*
 424          * If the caller doesn't specify the source address but
 425          * the outgoing interface, use an address associated with
 426          * the interface.
 427          */
 428         if (pi && pi->ipi6_ifindex) {
 429                 /* XXX boundary check is assumed to be already done. */
 430                 ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex],
 431                                        dst);
 432                 if (ia6 == 0) {
 433                         *errorp = EADDRNOTAVAIL;
 434                         return(0);
 435                 }
 436                 return(&satosin6(&ia6->ia_addr)->sin6_addr);
 437         }
 438
 439         /*
 440          * If the destination address is a link-local unicast address or
 441          * a multicast address, and if the outgoing interface is specified
 442          * by the sin6_scope_id filed, use an address associated with the
 443          * interface.
 444          * XXX: We're now trying to define more specific semantics of
 445          *      sin6_scope_id field, so this part will be rewritten in
 446          *      the near future.
 447          */
 448         if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
 449             dstsock->sin6_scope_id) {
 450                 /*
 451                  * I'm not sure if boundary check for scope_id is done
 452                  * somewhere...
 453                  */
 454                 if (dstsock->sin6_scope_id < 0 ||
 455                     if_index < dstsock->sin6_scope_id) {
 456                         *errorp = ENXIO; /* XXX: better error? */
 457                         return(0);
 458                 }
 459                 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
 460                                        dst);
 461                 if (ia6 == 0) {
 462                         *errorp = EADDRNOTAVAIL;
 463                         return(0);
 464                 }
 465                 return(&satosin6(&ia6->ia_addr)->sin6_addr);
 466         }
 467
 468         /*
 469          * If the destination address is a multicast address and
 470          * the outgoing interface for the address is specified
 471          * by the caller, use an address associated with the interface.
 472          * There is a sanity check here; if the destination has node-local
 473          * scope, the outgoing interfacde should be a loopback address.
 474          * Even if the outgoing interface is not specified, we also
 475          * choose a loopback interface as the outgoing interface.
 476          */
 477         if (IN6_IS_ADDR_MULTICAST(dst)) {
 478                 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
 479
 480                 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
 481                         ifp = &loif[0];
 482                 }
 483
 484                 if (ifp) {
 485                         ia6 = in6_ifawithscope(ifp, dst);
 486                         if (ia6 == 0) {
 487                                 *errorp = EADDRNOTAVAIL;
 488                                 return(0);
 489                         }
 490                         return(&ia6->ia_addr.sin6_addr);
 491                 }
 492         }
 493
 494         /*
 495          * If the next hop address for the packet is specified
 496          * by caller, use an address associated with the route
 497          * to the next hop.
 498          */
 499         {
 500                 struct sockaddr_in6 *sin6_next;
 501                 struct rtentry *rt;
 502
 503                 if (opts && opts->ip6po_nexthop) {
 504                         sin6_next = satosin6(opts->ip6po_nexthop);
 505                         rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
 506                         if (rt) {
 507                                 ia6 = in6_ifawithscope(rt->rt_ifp, dst);
 508                                 if (ia6 == 0)
 509                                         ia6 = ifatoia6(rt->rt_ifa);
 510                         }
 511                         if (ia6 == 0) {
 512                                 *errorp = EADDRNOTAVAIL;
 513                                 return(0);
 514                         }
 515                         return(&satosin6(&ia6->ia_addr)->sin6_addr);
 516                 }
 517         }
 518
 519         /*
 520          * If route is known or can be allocated now,
 521          * our src addr is taken from the i/f, else punt.
 522          */
 523         if (ro) {
 524                 if (ro->ro_rt &&
 525                     !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
 526                         RTFREE(ro->ro_rt);
 527                         ro->ro_rt = (struct rtentry *)0;
 528                 }
 529                 if (ro->ro_rt == (struct rtentry *)0 ||
 530                     ro->ro_rt->rt_ifp == (struct ifnet *)0) {
 531                         struct sockaddr_in6 *dst6;
 532
 533                         /* No route yet, so try to acquire one */
 534                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
 535                         dst6 = (struct sockaddr_in6 *)&ro->ro_dst;
 536                         dst6->sin6_family = AF_INET6;
 537                         dst6->sin6_len = sizeof(struct sockaddr_in6);
 538                         dst6->sin6_addr = *dst;
 539                         if (IN6_IS_ADDR_MULTICAST(dst)) {
 540                                 ro->ro_rt = rtalloc1(&((struct route *)ro)
 541                                                      ->ro_dst, 0, 0UL);
 542                         } else {
 543                                 rtalloc((struct route *)ro);
 544                         }
 545                 }
 546
 547                 /*
 548                  * in_pcbconnect() checks out IFF_LOOPBACK to skip using
 549                  * the address. But we don't know why it does so.
 550                  * It is necessary to ensure the scope even for lo0
 551                  * so doesn't check out IFF_LOOPBACK.
 552                  */
 553
 554                 if (ro->ro_rt) {
 555                         ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst);
 556                         if (ia6 == 0) /* xxx scope error ?*/
 557                                 ia6 = ifatoia6(ro->ro_rt->rt_ifa);
 558                 }
 559                 if (ia6 == 0) {
 560                         *errorp = EHOSTUNREACH; /* no route */
 561                         return(0);
 562                 }
 563                 return(&satosin6(&ia6->ia_addr)->sin6_addr);
 564         }
 565
 566         *errorp = EADDRNOTAVAIL;
 567         return(0);
 568 }
 569
 570 /*
 571  * Default hop limit selection. The precedence is as follows:
 572  * 1. Hoplimit valued specified via ioctl.
 573  * 2. (If the outgoing interface is detected) the current
 574  *     hop limit of the interface specified by router advertisement.
 575  * 3. The system default hoplimit.
 576 */
 577 int
 578 in6_selecthlim(in6p, ifp)
 579         struct in6pcb *in6p;
 580         struct ifnet *ifp;
 581 {
 582         if (in6p && in6p->in6p_hops >= 0)
 583                 return(in6p->in6p_hops);
 584         else if (ifp)
 585                 return(nd_ifinfo[ifp->if_index].chlim);
 586         else
 587                 return(ip6_defhlim);
 588 }
 589 #endif
 590
 591 void
 592 in6_pcbdisconnect(inp)
 593         struct inpcb *inp;
 594 {
 595         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 596         inp->inp_fport = 0;
 597         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 598         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 599         in_pcbrehash(inp);
 600         if (inp->inp_socket->so_state & SS_NOFDREF)
 601                 in6_pcbdetach(inp);
 602 }
 603
 604 void
 605 in6_pcbdetach(inp)
 606         struct inpcb *inp;
 607 {
 608         struct socket *so = inp->inp_socket;
 609         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 610
 611 #ifdef IPSEC
 612         if (inp->in6p_sp != NULL)
 613                 ipsec6_delete_pcbpolicy(inp);
 614 #endif /* IPSEC */
 615         inp->inp_gencnt = ++ipi->ipi_gencnt;
 616         in_pcbremlists(inp);
 617         sotoinpcb(so) = 0;
 618         sofree(so);
 619
 620         if (inp->in6p_options)
 621                 m_freem(inp->in6p_options);
 622         ip6_freepcbopts(inp->in6p_outputopts);
 623         ip6_freemoptions(inp->in6p_moptions);
 624         if (inp->in6p_route.ro_rt)
 625                 rtfree(inp->in6p_route.ro_rt);
 626         /* Check and free IPv4 related resources in case of mapped addr */
 627         if (inp->inp_options)
 628                 (void)m_free(inp->inp_options);
 629         ip_freemoptions(inp->inp_moptions);
 630
 631         inp->inp_vflag = 0;
 632         zfreei(ipi->ipi_zone, inp);
 633 }
 634
 635 /*
 636  * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
 637  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 638  * in struct pr_usrreqs, so that protocols can just reference then directly
 639  * without the need for a wrapper function.  The socket must have a valid
 640  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 641  * except through a kernel programming error, so it is acceptable to panic
 642  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 643  * because there actually /is/ a programming error somewhere... XXX)
 644  */
 645 int
 646 in6_setsockaddr(so, nam)
 647         struct socket *so;
 648         struct sockaddr **nam;
 649 {
 650         int s;
 651         register struct inpcb *inp;
 652         register struct sockaddr_in6 *sin6;
 653
 654         /*
 655          * Do the malloc first in case it blocks.
 656          */
 657         MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK);
 658         bzero(sin6, sizeof *sin6);
 659         sin6->sin6_family = AF_INET6;
 660         sin6->sin6_len = sizeof(*sin6);
 661
 662         s = splnet();
 663         inp = sotoinpcb(so);
 664         if (!inp) {
 665                 splx(s);
 666                 free(sin6, M_SONAME);
 667                 return EINVAL;
 668         }
 669         sin6->sin6_port = inp->inp_lport;
 670         sin6->sin6_addr = inp->in6p_laddr;
 671         splx(s);
 672         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 673                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 674         else
 675                 sin6->sin6_scope_id = 0;        /*XXX*/
 676         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 677                 sin6->sin6_addr.s6_addr16[1] = 0;
 678
 679         *nam = (struct sockaddr *)sin6;
 680         return 0;
 681 }
 682
 683 int
 684 in6_setpeeraddr(so, nam)
 685         struct socket *so;
 686         struct sockaddr **nam;
 687 {
 688         int s;
 689         struct inpcb *inp;
 690         register struct sockaddr_in6 *sin6;
 691
 692         /*
 693          * Do the malloc first in case it blocks.
 694          */
 695         MALLOC(sin6, struct sockaddr_in6 *, sizeof(*sin6), M_SONAME, M_WAITOK);
 696         bzero((caddr_t)sin6, sizeof (*sin6));
 697         sin6->sin6_family = AF_INET6;
 698         sin6->sin6_len = sizeof(struct sockaddr_in6);
 699
 700         s = splnet();
 701         inp = sotoinpcb(so);
 702         if (!inp) {
 703                 splx(s);
 704                 free(sin6, M_SONAME);
 705                 return EINVAL;
 706         }
 707         sin6->sin6_port = inp->inp_fport;
 708         sin6->sin6_addr = inp->in6p_faddr;
 709         splx(s);
 710         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 711                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 712         else
 713                 sin6->sin6_scope_id = 0;        /*XXX*/
 714         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 715                 sin6->sin6_addr.s6_addr16[1] = 0;
 716
 717         *nam = (struct sockaddr *)sin6;
 718         return 0;
 719 }
 720
 721 int
 722 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 723 {
 724         struct  inpcb *inp = sotoinpcb(so);
 725         int     error;
 726
 727         if (inp == NULL)
 728                 return EINVAL;
 729         if (inp->inp_vflag & INP_IPV4) {
 730                 error = in_setsockaddr(so, nam);
 731                 if (error == 0)
 732                         in6_sin_2_v4mapsin6_in_sock(nam);
 733         } else
 734         /* scope issues will be handled in in6_setsockaddr(). */
 735         error = in6_setsockaddr(so, nam);
 736
 737         return error;
 738 }
 739
 740 int
 741 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 742 {
 743         struct  inpcb *inp = sotoinpcb(so);
 744         int     error;
 745
 746         if (inp == NULL)
 747                 return EINVAL;
 748         if (inp->inp_vflag & INP_IPV4) {
 749                 error = in_setpeeraddr(so, nam);
 750                 if (error == 0)
 751                         in6_sin_2_v4mapsin6_in_sock(nam);
 752         } else
 753         /* scope issues will be handled in in6_setpeeraddr(). */
 754         error = in6_setpeeraddr(so, nam);
 755
 756         return error;
 757 }
 758
 759 /*
 760  * Pass some notification to all connections of a protocol
 761  * associated with address dst.  The local address and/or port numbers
 762  * may be specified to limit the search.  The "usual action" will be
 763  * taken, depending on the ctlinput cmd.  The caller must filter any
 764  * cmds that are uninteresting (e.g., no error in the map).
 765  * Call the protocol specific routine (if any) to report
 766  * any errors for each matching socket.
 767  *
 768  * Must be called at splnet.
 769  */
 770 void
 771 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, notify)
 772         struct inpcbhead *head;
 773         struct sockaddr *dst, *src;
 774         u_int fport_arg, lport_arg;
 775         int cmd;
 776         void (*notify) __P((struct inpcb *, int));
 777 {
 778         struct inpcb *inp, *ninp;
 779         struct sockaddr_in6 sa6_src, *sa6_dst;
 780         u_short fport = fport_arg, lport = lport_arg;
 781         u_int32_t flowinfo;
 782         int errno, s;
 783
 784         if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6)
 785                 return;
 786
 787         sa6_dst = (struct sockaddr_in6 *)dst;
 788         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 789                 return;
 790
 791         /*
 792          * note that src can be NULL when we get notify by local fragmentation.
 793          */
 794         sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src;
 795         flowinfo = sa6_src.sin6_flowinfo;
 796
 797         /*
 798          * Redirects go to all references to the destination,
 799          * and use in6_rtchange to invalidate the route cache.
 800          * Dead host indications: also use in6_rtchange to invalidate
 801          * the cache, and deliver the error to all the sockets.
 802          * Otherwise, if we have knowledge of the local port and address,
 803          * deliver only to that socket.
 804          */
 805         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 806                 fport = 0;
 807                 lport = 0;
 808                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 809
 810                 if (cmd != PRC_HOSTDEAD)
 811                         notify = in6_rtchange;
 812         }
 813         errno = inet6ctlerrmap[cmd];
 814         s = splnet();
 815         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 816                 ninp = LIST_NEXT(inp, inp_list);
 817
 818                 if ((inp->inp_vflag & INP_IPV6) == 0)
 819                         continue;
 820
 821                 /*
 822                  * Detect if we should notify the error. If no source and
 823                  * destination ports are specifed, but non-zero flowinfo and
 824                  * local address match, notify the error. This is the case
 825                  * when the error is delivered with an encrypted buffer
 826                  * by ESP. Otherwise, just compare addresses and ports
 827                  * as usual.
 828                  */
 829                 if (lport == 0 && fport == 0 && flowinfo &&
 830                     inp->inp_socket != NULL &&
 831                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
 832                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 833                         goto do_notify;
 834                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 835                                              &sa6_dst->sin6_addr) ||
 836                          inp->inp_socket == 0 ||
 837                          (lport && inp->inp_lport != lport) ||
 838                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 839                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 840                                               &sa6_src.sin6_addr)) ||
 841                          (fport && inp->inp_fport != fport))
 842                         continue;
 843
 844           do_notify:
 845                 if (notify)
 846                         (*notify)(inp, errno);
 847         }
 848         splx(s);
 849 }
 850
 851 /*
 852  * Lookup a PCB based on the local address and port.
 853  */
 854 struct inpcb *
 855 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
 856         struct inpcbinfo *pcbinfo;
 857         struct in6_addr *laddr;
 858         u_int lport_arg;
 859         int wild_okay;
 860 {
 861         register struct inpcb *inp;
 862         int matchwild = 3, wildcard;
 863         u_short lport = lport_arg;
 864
 865         if (!wild_okay) {
 866                 struct inpcbhead *head;
 867                 /*
 868                  * Look for an unconnected (wildcard foreign addr) PCB that
 869                  * matches the local address and port we're looking for.
 870                  */
 871                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
 872                                                       pcbinfo->hashmask)];
 873                 LIST_FOREACH(inp, head, inp_hash) {
 874                         if ((inp->inp_vflag & INP_IPV6) == 0)
 875                                 continue;
 876                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 877                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 878                             inp->inp_lport == lport) {
 879                                 /*
 880                                  * Found.
 881                                  */
 882                                 return (inp);
 883                         }
 884                 }
 885                 /*
 886                  * Not found.
 887                  */
 888                 return (NULL);
 889         } else {
 890                 struct inpcbporthead *porthash;
 891                 struct inpcbport *phd;
 892                 struct inpcb *match = NULL;
 893                 /*
 894                  * Best fit PCB lookup.
 895                  *
 896                  * First see if this local port is in use by looking on the
 897                  * port hash list.
 898                  */
 899                 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 900                     pcbinfo->porthashmask)];
 901                 LIST_FOREACH(phd, porthash, phd_hash) {
 902                         if (phd->phd_port == lport)
 903                                 break;
 904                 }
 905                 if (phd != NULL) {
 906                         /*
 907                          * Port is in use by one or more PCBs. Look for best
 908                          * fit.
 909                          */
 910                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 911                                 wildcard = 0;
 912                                 if ((inp->inp_vflag & INP_IPV6) == 0)
 913                                         continue;
 914                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 915                                         wildcard++;
 916                                 if (!IN6_IS_ADDR_UNSPECIFIED(
 917                                         &inp->in6p_laddr)) {
 918                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 919                                                 wildcard++;
 920                                         else if (!IN6_ARE_ADDR_EQUAL(
 921                                                 &inp->in6p_laddr, laddr))
 922                                                 continue;
 923                                 } else {
 924                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 925                                                 wildcard++;
 926                                 }
 927                                 if (wildcard < matchwild) {
 928                                         match = inp;
 929                                         matchwild = wildcard;
 930                                         if (matchwild == 0) {
 931                                                 break;
 932                                         }
 933                                 }
 934                         }
 935                 }
 936                 return (match);
 937         }
 938 }
 939
 940 void
 941 in6_pcbpurgeif0(head, ifp)
 942         struct in6pcb *head;
 943         struct ifnet *ifp;
 944 {
 945         struct in6pcb *in6p;
 946         struct ip6_moptions *im6o;
 947         struct in6_multi_mship *imm, *nimm;
 948
 949         for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
 950                 im6o = in6p->in6p_moptions;
 951                 if ((in6p->inp_vflag & INP_IPV6) &&
 952                     im6o) {
 953                         /*
 954                          * Unselect the outgoing interface if it is being
 955                          * detached.
 956                          */
 957                         if (im6o->im6o_multicast_ifp == ifp)
 958                                 im6o->im6o_multicast_ifp = NULL;
 959
 960                         /*
 961                          * Drop multicast group membership if we joined
 962                          * through the interface being detached.
 963                          * XXX controversial - is it really legal for kernel
 964                          * to force this?
 965                          */
 966                         for (imm = im6o->im6o_memberships.lh_first;
 967                              imm != NULL; imm = nimm) {
 968                                 nimm = imm->i6mm_chain.le_next;
 969                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
 970                                         LIST_REMOVE(imm, i6mm_chain);
 971                                         in6_delmulti(imm->i6mm_maddr);
 972                                         free(imm, M_IPMADDR);
 973                                 }
 974                         }
 975                 }
 976         }
 977 }
 978
 979 /*
 980  * Check for alternatives when higher level complains
 981  * about service problems.  For now, invalidate cached
 982  * routing information.  If the route was created dynamically
 983  * (by a redirect), time to try a default gateway again.
 984  */
 985 void
 986 in6_losing(in6p)
 987         struct inpcb *in6p;
 988 {
 989         struct rtentry *rt;
 990         struct rt_addrinfo info;
 991
 992         if ((rt = in6p->in6p_route.ro_rt) != NULL) {
 993                 bzero((caddr_t)&info, sizeof(info));
 994                 info.rti_flags = rt->rt_flags;
 995                 info.rti_info[RTAX_DST] = rt_key(rt);
 996                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 997                 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 998                 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
 999                 if (rt->rt_flags & RTF_DYNAMIC)
1000                         (void)rtrequest1(RTM_DELETE, &info, NULL);
1001                 in6p->in6p_route.ro_rt = NULL;
1002                 rtfree(rt);
1003                 /*
1004                  * A new route can be allocated
1005                  * the next time output is attempted.
1006                  */
1007         }
1008 }
1009
1010 /*
1011  * After a routing change, flush old routing
1012  * and allocate a (hopefully) better one.
1013  */
1014 void
1015 in6_rtchange(inp, errno)
1016         struct inpcb *inp;
1017         int errno;
1018 {
1019         if (inp->in6p_route.ro_rt) {
1020                 rtfree(inp->in6p_route.ro_rt);
1021                 inp->in6p_route.ro_rt = 0;
1022                 /*
1023                  * A new route can be allocated the next time
1024                  * output is attempted.
1025                  */
1026         }
1027 }
1028
1029 /*
1030  * Lookup PCB in hash list.
1031  */
1032 struct inpcb *
1033 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp)
1034         struct inpcbinfo *pcbinfo;
1035         struct in6_addr *faddr, *laddr;
1036         u_int fport_arg, lport_arg;
1037         int wildcard;
1038         struct ifnet *ifp;
1039 {
1040         struct inpcbhead *head;
1041         register struct inpcb *inp;
1042         u_short fport = fport_arg, lport = lport_arg;
1043         int faith;
1044
1045         if (faithprefix_p != NULL)
1046                 faith = (*faithprefix_p)(laddr);
1047         else
1048                 faith = 0;
1049
1050         /*
1051          * First look for an exact match.
1052          */
1053         head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */,
1054                                               lport, fport,
1055                                               pcbinfo->hashmask)];
1056         LIST_FOREACH(inp, head, inp_hash) {
1057                 if ((inp->inp_vflag & INP_IPV6) == 0)
1058                         continue;
1059                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1060                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1061                     inp->inp_fport == fport &&
1062                     inp->inp_lport == lport) {
1063                         /*
1064                          * Found.
1065                          */
1066                         return (inp);
1067                 }
1068         }
1069         if (wildcard) {
1070                 struct inpcb *local_wild = NULL;
1071
1072                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
1073                                                       pcbinfo->hashmask)];
1074                 LIST_FOREACH(inp, head, inp_hash) {
1075                         if ((inp->inp_vflag & INP_IPV6) == 0)
1076                                 continue;
1077                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1078                             inp->inp_lport == lport) {
1079                                 if (faith && (inp->inp_flags & INP_FAITH) == 0)
1080                                         continue;
1081                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
1082                                                        laddr))
1083                                         return (inp);
1084                                 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1085                                         local_wild = inp;
1086                         }
1087                 }
1088                 return (local_wild);
1089         }
1090
1091         /*
1092          * Not found.
1093          */
1094         return (NULL);
1095 }
1096
1097 void
1098 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
1099 {
1100         struct ip6_hdr *ip;
1101
1102         ip = mtod(m, struct ip6_hdr *);
1103         bzero(sin6, sizeof(*sin6));
1104         sin6->sin6_len = sizeof(*sin6);
1105         sin6->sin6_family = AF_INET6;
1106         sin6->sin6_addr = ip->ip6_src;
1107         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1108                 sin6->sin6_addr.s6_addr16[1] = 0;
1109         sin6->sin6_scope_id =
1110                 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1111                 ? m->m_pkthdr.rcvif->if_index : 0;
1112
1113         return;
1114 }