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 /*      $DragonFly: src/sys/netinet6/in6_pcb.c,v 1.7 2003/07/26 21:04:50 rob Exp $      */
   3 /*      $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $        */
   4
   5 /*
   6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  */
  34
  35 /*
  36  * Copyright (c) 1982, 1986, 1991, 1993
  37  *      The Regents of the University of California.  All rights reserved.
  38  *
  39  * Redistribution and use in source and binary forms, with or without
  40  * modification, are permitted provided that the following conditions
  41  * are met:
  42  * 1. Redistributions of source code must retain the above copyright
  43  *    notice, this list of conditions and the following disclaimer.
  44  * 2. Redistributions in binary form must reproduce the above copyright
  45  *    notice, this list of conditions and the following disclaimer in the
  46  *    documentation and/or other materials provided with the distribution.
  47  * 3. All advertising materials mentioning features or use of this software
  48  *    must display the following acknowledgement:
  49  *      This product includes software developed by the University of
  50  *      California, Berkeley and its contributors.
  51  * 4. Neither the name of the University nor the names of its contributors
  52  *    may be used to endorse or promote products derived from this software
  53  *    without specific prior written permission.
  54  *
  55  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  56  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  57  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  58  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  59  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  60  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  61  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  62  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  63  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  64  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  65  * SUCH DAMAGE.
  66  *
  67  *      @(#)in_pcb.c    8.2 (Berkeley) 1/4/94
  68  */
  69
  70 #include "opt_inet.h"
  71 #include "opt_inet6.h"
  72 #include "opt_ipsec.h"
  73
  74 #include <sys/param.h>
  75 #include <sys/systm.h>
  76 #include <sys/malloc.h>
  77 #include <sys/mbuf.h>
  78 #include <sys/domain.h>
  79 #include <sys/protosw.h>
  80 #include <sys/socket.h>
  81 #include <sys/socketvar.h>
  82 #include <sys/sockio.h>
  83 #include <sys/errno.h>
  84 #include <sys/time.h>
  85 #include <sys/proc.h>
  86 #include <sys/jail.h>
  87
  88 #include <vm/vm_zone.h>
  89
  90 #include <net/if.h>
  91 #include <net/if_types.h>
  92 #include <net/route.h>
  93
  94 #include <netinet/in.h>
  95 #include <netinet/in_var.h>
  96 #include <netinet/in_systm.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 #ifdef FAST_IPSEC
 117 #include <netipsec/ipsec.h>
 118 #include <netipsec/ipsec6.h>
 119 #include <netipsec/key.h>
 120 #define IPSEC
 121 #endif /* FAST_IPSEC */
 122
 123 struct  in6_addr zeroin6_addr;
 124
 125 int
 126 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 127 {
 128         struct socket *so = inp->inp_socket;
 129         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
 130         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 131         u_short lport = 0;
 132         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 133
 134         if (!in6_ifaddr) /* XXX broken! */
 135                 return (EADDRNOTAVAIL);
 136         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 137                 return(EINVAL);
 138         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 139                 wild = 1;
 140         if (nam) {
 141                 sin6 = (struct sockaddr_in6 *)nam;
 142                 if (nam->sa_len != sizeof(*sin6))
 143                         return(EINVAL);
 144                 /*
 145                  * family check.
 146                  */
 147                 if (nam->sa_family != AF_INET6)
 148                         return(EAFNOSUPPORT);
 149
 150                 /* KAME hack: embed scopeid */
 151                 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0)
 152                         return EINVAL;
 153                 /* this must be cleared for ifa_ifwithaddr() */
 154                 sin6->sin6_scope_id = 0;
 155
 156                 lport = sin6->sin6_port;
 157                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 158                         /*
 159                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 160                          * allow compepte duplication of binding if
 161                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 162                          * and a multicast address is bound on both
 163                          * new and duplicated sockets.
 164                          */
 165                         if (so->so_options & SO_REUSEADDR)
 166                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 167                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 168                         struct ifaddr *ia = NULL;
 169
 170                         sin6->sin6_port = 0;            /* yech... */
 171                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
 172                                 return(EADDRNOTAVAIL);
 173
 174                         /*
 175                          * XXX: bind to an anycast address might accidentally
 176                          * cause sending a packet with anycast source address.
 177                          * We should allow to bind to a deprecated address, since
 178                          * the application dare to use it.
 179                          */
 180                         if (ia &&
 181                             ((struct in6_ifaddr *)ia)->ia6_flags &
 182                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
 183                                 return(EADDRNOTAVAIL);
 184                         }
 185                 }
 186                 if (lport) {
 187                         struct inpcb *t;
 188                         struct proc *p = td->td_proc; /* may be NULL */
 189
 190                         /* GROSS */
 191                         if (ntohs(lport) < IPV6PORT_RESERVED && p &&
 192                             suser_cred(p->p_ucred, PRISON_ROOT))
 193                                 return(EACCES);
 194                         if (so->so_cred->cr_uid != 0 &&
 195                             !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 196                                 t = in6_pcblookup_local(pcbinfo,
 197                                     &sin6->sin6_addr, lport,
 198                                     INPLOOKUP_WILDCARD);
 199                                 if (t &&
 200                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 201                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 202                                      (t->inp_socket->so_options &
 203                                       SO_REUSEPORT) == 0) &&
 204                                     (so->so_cred->cr_uid !=
 205                                      t->inp_socket->so_cred->cr_uid))
 206                                         return (EADDRINUSE);
 207                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 208                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 209                                         struct sockaddr_in sin;
 210
 211                                         in6_sin6_2_sin(&sin, sin6);
 212                                         t = in_pcblookup_local(pcbinfo,
 213                                                 sin.sin_addr, lport,
 214                                                 INPLOOKUP_WILDCARD);
 215                                         if (t &&
 216                                             (so->so_cred->cr_uid !=
 217                                              t->inp_socket->so_cred->cr_uid) &&
 218                                             (ntohl(t->inp_laddr.s_addr) !=
 219                                              INADDR_ANY ||
 220                                              INP_SOCKAF(so) ==
 221                                              INP_SOCKAF(t->inp_socket)))
 222                                                 return (EADDRINUSE);
 223                                 }
 224                         }
 225                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 226                                                 lport, wild);
 227                         if (t && (reuseport & t->inp_socket->so_options) == 0)
 228                                 return(EADDRINUSE);
 229                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 230                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 231                                 struct sockaddr_in sin;
 232
 233                                 in6_sin6_2_sin(&sin, sin6);
 234                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
 235                                                        lport, wild);
 236                                 if (t &&
 237                                     (reuseport & t->inp_socket->so_options)
 238                                     == 0 &&
 239                                     (ntohl(t->inp_laddr.s_addr)
 240                                      != INADDR_ANY ||
 241                                      INP_SOCKAF(so) ==
 242                                      INP_SOCKAF(t->inp_socket)))
 243                                         return (EADDRINUSE);
 244                         }
 245                 }
 246                 inp->in6p_laddr = sin6->sin6_addr;
 247         }
 248         if (lport == 0) {
 249                 int e;
 250                 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, td)) != 0)
 251                         return(e);
 252         }
 253         else {
 254                 inp->inp_lport = lport;
 255                 if (in_pcbinshash(inp) != 0) {
 256                         inp->in6p_laddr = in6addr_any;
 257                         inp->inp_lport = 0;
 258                         return (EAGAIN);
 259                 }
 260         }
 261         return(0);
 262 }
 263
 264 /*
 265  *   Transform old in6_pcbconnect() into an inner subroutine for new
 266  *   in6_pcbconnect(): Do some validity-checking on the remote
 267  *   address (in mbuf 'nam') and then determine local host address
 268  *   (i.e., which interface) to use to access that remote host.
 269  *
 270  *   This preserves definition of in6_pcbconnect(), while supporting a
 271  *   slightly different version for T/TCP.  (This is more than
 272  *   a bit of a kludge, but cleaning up the internal interfaces would
 273  *   have forced minor changes in every protocol).
 274  */
 275
 276 int
 277 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 278         struct in6_addr **plocal_addr6)
 279 {
 280         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 281         struct ifnet *ifp = NULL;
 282         int error = 0;
 283
 284         if (nam->sa_len != sizeof (*sin6))
 285                 return (EINVAL);
 286         if (sin6->sin6_family != AF_INET6)
 287                 return (EAFNOSUPPORT);
 288         if (sin6->sin6_port == 0)
 289                 return (EADDRNOTAVAIL);
 290
 291         /* KAME hack: embed scopeid */
 292         if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
 293                 return EINVAL;
 294
 295         if (in6_ifaddr) {
 296                 /*
 297                  * If the destination address is UNSPECIFIED addr,
 298                  * use the loopback addr, e.g ::1.
 299                  */
 300                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 301                         sin6->sin6_addr = in6addr_loopback;
 302         }
 303         {
 304                 /*
 305                  * XXX: in6_selectsrc might replace the bound local address
 306                  * with the address specified by setsockopt(IPV6_PKTINFO).
 307                  * Is it the intended behavior?
 308                  */
 309                 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
 310                                               inp->in6p_moptions,
 311                                               &inp->in6p_route,
 312                                               &inp->in6p_laddr, &error);
 313                 if (*plocal_addr6 == 0) {
 314                         if (error == 0)
 315                                 error = EADDRNOTAVAIL;
 316                         return(error);
 317                 }
 318                 /*
 319                  * Don't do pcblookup call here; return interface in
 320                  * plocal_addr6
 321                  * and exit to caller, that will do the lookup.
 322                  */
 323         }
 324
 325         if (inp->in6p_route.ro_rt)
 326                 ifp = inp->in6p_route.ro_rt->rt_ifp;
 327
 328         return(0);
 329 }
 330
 331 /*
 332  * Outer subroutine:
 333  * Connect from a socket to a specified address.
 334  * Both address and port must be specified in argument sin.
 335  * If don't have a local address for this socket yet,
 336  * then pick one.
 337  */
 338 int
 339 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 340 {
 341         struct in6_addr *addr6;
 342         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(ifindex2ifnet[pi->ipi6_ifindex],
 425                                        dst);
 426                 if (ia6 == 0) {
 427                         *errorp = EADDRNOTAVAIL;
 428                         return(0);
 429                 }
 430                 return(&satosin6(&ia6->ia_addr)->sin6_addr);
 431         }
 432
 433         /*
 434          * If the destination address is a link-local unicast address or
 435          * a multicast address, and if the outgoing interface is specified
 436          * by the sin6_scope_id filed, use an address associated with the
 437          * interface.
 438          * XXX: We're now trying to define more specific semantics of
 439          *      sin6_scope_id field, so this part will be rewritten in
 440          *      the near future.
 441          */
 442         if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
 443             dstsock->sin6_scope_id) {
 444                 /*
 445                  * I'm not sure if boundary check for scope_id is done
 446                  * somewhere...
 447                  */
 448                 if (dstsock->sin6_scope_id < 0 ||
 449                     if_index < dstsock->sin6_scope_id) {
 450                         *errorp = ENXIO; /* XXX: better error? */
 451                         return(0);
 452                 }
 453                 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
 454                                        dst);
 455                 if (ia6 == 0) {
 456                         *errorp = EADDRNOTAVAIL;
 457                         return(0);
 458                 }
 459                 return(&satosin6(&ia6->ia_addr)->sin6_addr);
 460         }
 461
 462         /*
 463          * If the destination address is a multicast address and
 464          * the outgoing interface for the address is specified
 465          * by the caller, use an address associated with the interface.
 466          * There is a sanity check here; if the destination has node-local
 467          * scope, the outgoing interfacde should be a loopback address.
 468          * Even if the outgoing interface is not specified, we also
 469          * choose a loopback interface as the outgoing interface.
 470          */
 471         if (IN6_IS_ADDR_MULTICAST(dst)) {
 472                 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
 473
 474                 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
 475                         ifp = &loif[0];
 476                 }
 477
 478                 if (ifp) {
 479                         ia6 = in6_ifawithscope(ifp, dst);
 480                         if (ia6 == 0) {
 481                                 *errorp = EADDRNOTAVAIL;
 482                                 return(0);
 483                         }
 484                         return(&ia6->ia_addr.sin6_addr);
 485                 }
 486         }
 487
 488         /*
 489          * If the next hop address for the packet is specified
 490          * by caller, use an address associated with the route
 491          * to the next hop.
 492          */
 493         {
 494                 struct sockaddr_in6 *sin6_next;
 495                 struct rtentry *rt;
 496
 497                 if (opts && opts->ip6po_nexthop) {
 498                         sin6_next = satosin6(opts->ip6po_nexthop);
 499                         rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
 500                         if (rt) {
 501                                 ia6 = in6_ifawithscope(rt->rt_ifp, dst);
 502                                 if (ia6 == 0)
 503                                         ia6 = ifatoia6(rt->rt_ifa);
 504                         }
 505                         if (ia6 == 0) {
 506                                 *errorp = EADDRNOTAVAIL;
 507                                 return(0);
 508                         }
 509                         return(&satosin6(&ia6->ia_addr)->sin6_addr);
 510                 }
 511         }
 512
 513         /*
 514          * If route is known or can be allocated now,
 515          * our src addr is taken from the i/f, else punt.
 516          */
 517         if (ro) {
 518                 if (ro->ro_rt &&
 519                     !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
 520                         RTFREE(ro->ro_rt);
 521                         ro->ro_rt = (struct rtentry *)0;
 522                 }
 523                 if (ro->ro_rt == (struct rtentry *)0 ||
 524                     ro->ro_rt->rt_ifp == (struct ifnet *)0) {
 525                         struct sockaddr_in6 *dst6;
 526
 527                         /* No route yet, so try to acquire one */
 528                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
 529                         dst6 = (struct sockaddr_in6 *)&ro->ro_dst;
 530                         dst6->sin6_family = AF_INET6;
 531                         dst6->sin6_len = sizeof(struct sockaddr_in6);
 532                         dst6->sin6_addr = *dst;
 533                         if (IN6_IS_ADDR_MULTICAST(dst)) {
 534                                 ro->ro_rt = rtalloc1(&((struct route *)ro)
 535                                                      ->ro_dst, 0, 0UL);
 536                         } else {
 537                                 rtalloc((struct route *)ro);
 538                         }
 539                 }
 540
 541                 /*
 542                  * in_pcbconnect() checks out IFF_LOOPBACK to skip using
 543                  * the address. But we don't know why it does so.
 544                  * It is necessary to ensure the scope even for lo0
 545                  * so doesn't check out IFF_LOOPBACK.
 546                  */
 547
 548                 if (ro->ro_rt) {
 549                         ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst);
 550                         if (ia6 == 0) /* xxx scope error ?*/
 551                                 ia6 = ifatoia6(ro->ro_rt->rt_ifa);
 552                 }
 553                 if (ia6 == 0) {
 554                         *errorp = EHOSTUNREACH; /* no route */
 555                         return(0);
 556                 }
 557                 return(&satosin6(&ia6->ia_addr)->sin6_addr);
 558         }
 559
 560         *errorp = EADDRNOTAVAIL;
 561         return(0);
 562 }
 563
 564 /*
 565  * Default hop limit selection. The precedence is as follows:
 566  * 1. Hoplimit valued specified via ioctl.
 567  * 2. (If the outgoing interface is detected) the current
 568  *     hop limit of the interface specified by router advertisement.
 569  * 3. The system default hoplimit.
 570 */
 571 int
 572 in6_selecthlim(in6p, ifp)
 573         struct in6pcb *in6p;
 574         struct ifnet *ifp;
 575 {
 576         if (in6p && in6p->in6p_hops >= 0)
 577                 return(in6p->in6p_hops);
 578         else if (ifp)
 579                 return(nd_ifinfo[ifp->if_index].chlim);
 580         else
 581                 return(ip6_defhlim);
 582 }
 583 #endif
 584
 585 void
 586 in6_pcbdisconnect(inp)
 587         struct inpcb *inp;
 588 {
 589         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 590         inp->inp_fport = 0;
 591         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 592         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 593         in_pcbrehash(inp);
 594         if (inp->inp_socket->so_state & SS_NOFDREF)
 595                 in6_pcbdetach(inp);
 596 }
 597
 598 void
 599 in6_pcbdetach(inp)
 600         struct inpcb *inp;
 601 {
 602         struct socket *so = inp->inp_socket;
 603         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 604
 605 #ifdef IPSEC
 606         if (inp->in6p_sp != NULL)
 607                 ipsec6_delete_pcbpolicy(inp);
 608 #endif /* IPSEC */
 609         inp->inp_gencnt = ++ipi->ipi_gencnt;
 610         in_pcbremlists(inp);
 611         sotoinpcb(so) = 0;
 612         sofree(so);
 613
 614         if (inp->in6p_options)
 615                 m_freem(inp->in6p_options);
 616         ip6_freepcbopts(inp->in6p_outputopts);
 617         ip6_freemoptions(inp->in6p_moptions);
 618         if (inp->in6p_route.ro_rt)
 619                 rtfree(inp->in6p_route.ro_rt);
 620         /* Check and free IPv4 related resources in case of mapped addr */
 621         if (inp->inp_options)
 622                 (void)m_free(inp->inp_options);
 623         ip_freemoptions(inp->inp_moptions);
 624
 625         inp->inp_vflag = 0;
 626         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         struct inpcb *inp;
 646         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         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);
 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);
 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         u_int fport_arg;
 769         const struct sockaddr *src;
 770         u_int lport_arg;
 771         int cmd;
 772         void (*notify) __P((struct inpcb *, int));
 773 {
 774         struct inpcb *inp, *ninp;
 775         struct sockaddr_in6 sa6_src, *sa6_dst;
 776         u_short fport = fport_arg, lport = lport_arg;
 777         u_int32_t flowinfo;
 778         int errno, s;
 779
 780         if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6)
 781                 return;
 782
 783         sa6_dst = (struct sockaddr_in6 *)dst;
 784         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 785                 return;
 786
 787         /*
 788          * note that src can be NULL when we get notify by local fragmentation.
 789          */
 790         sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src;
 791         flowinfo = sa6_src.sin6_flowinfo;
 792
 793         /*
 794          * Redirects go to all references to the destination,
 795          * and use in6_rtchange to invalidate the route cache.
 796          * Dead host indications: also use in6_rtchange to invalidate
 797          * the cache, and deliver the error to all the sockets.
 798          * Otherwise, if we have knowledge of the local port and address,
 799          * deliver only to that socket.
 800          */
 801         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 802                 fport = 0;
 803                 lport = 0;
 804                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 805
 806                 if (cmd != PRC_HOSTDEAD)
 807                         notify = in6_rtchange;
 808         }
 809         errno = inet6ctlerrmap[cmd];
 810         s = splnet();
 811         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 812                 ninp = LIST_NEXT(inp, inp_list);
 813
 814                 if ((inp->inp_vflag & INP_IPV6) == 0)
 815                         continue;
 816
 817                 /*
 818                  * Detect if we should notify the error. If no source and
 819                  * destination ports are specifed, but non-zero flowinfo and
 820                  * local address match, notify the error. This is the case
 821                  * when the error is delivered with an encrypted buffer
 822                  * by ESP. Otherwise, just compare addresses and ports
 823                  * as usual.
 824                  */
 825                 if (lport == 0 && fport == 0 && flowinfo &&
 826                     inp->inp_socket != NULL &&
 827                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
 828                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 829                         goto do_notify;
 830                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 831                                              &sa6_dst->sin6_addr) ||
 832                          inp->inp_socket == 0 ||
 833                          (lport && inp->inp_lport != lport) ||
 834                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 835                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 836                                               &sa6_src.sin6_addr)) ||
 837                          (fport && inp->inp_fport != fport))
 838                         continue;
 839
 840           do_notify:
 841                 if (notify)
 842                         (*notify)(inp, errno);
 843         }
 844         splx(s);
 845 }
 846
 847 /*
 848  * Lookup a PCB based on the local address and port.
 849  */
 850 struct inpcb *
 851 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
 852         struct inpcbinfo *pcbinfo;
 853         struct in6_addr *laddr;
 854         u_int lport_arg;
 855         int wild_okay;
 856 {
 857         struct inpcb *inp;
 858         int matchwild = 3, wildcard;
 859         u_short lport = lport_arg;
 860
 861         if (!wild_okay) {
 862                 struct inpcbhead *head;
 863                 /*
 864                  * Look for an unconnected (wildcard foreign addr) PCB that
 865                  * matches the local address and port we're looking for.
 866                  */
 867                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
 868                                                       pcbinfo->hashmask)];
 869                 LIST_FOREACH(inp, head, inp_hash) {
 870                         if ((inp->inp_vflag & INP_IPV6) == 0)
 871                                 continue;
 872                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 873                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 874                             inp->inp_lport == lport) {
 875                                 /*
 876                                  * Found.
 877                                  */
 878                                 return (inp);
 879                         }
 880                 }
 881                 /*
 882                  * Not found.
 883                  */
 884                 return (NULL);
 885         } else {
 886                 struct inpcbporthead *porthash;
 887                 struct inpcbport *phd;
 888                 struct inpcb *match = NULL;
 889                 /*
 890                  * Best fit PCB lookup.
 891                  *
 892                  * First see if this local port is in use by looking on the
 893                  * port hash list.
 894                  */
 895                 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 896                     pcbinfo->porthashmask)];
 897                 LIST_FOREACH(phd, porthash, phd_hash) {
 898                         if (phd->phd_port == lport)
 899                                 break;
 900                 }
 901                 if (phd != NULL) {
 902                         /*
 903                          * Port is in use by one or more PCBs. Look for best
 904                          * fit.
 905                          */
 906                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 907                                 wildcard = 0;
 908                                 if ((inp->inp_vflag & INP_IPV6) == 0)
 909                                         continue;
 910                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 911                                         wildcard++;
 912                                 if (!IN6_IS_ADDR_UNSPECIFIED(
 913                                         &inp->in6p_laddr)) {
 914                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 915                                                 wildcard++;
 916                                         else if (!IN6_ARE_ADDR_EQUAL(
 917                                                 &inp->in6p_laddr, laddr))
 918                                                 continue;
 919                                 } else {
 920                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 921                                                 wildcard++;
 922                                 }
 923                                 if (wildcard < matchwild) {
 924                                         match = inp;
 925                                         matchwild = wildcard;
 926                                         if (matchwild == 0) {
 927                                                 break;
 928                                         }
 929                                 }
 930                         }
 931                 }
 932                 return (match);
 933         }
 934 }
 935
 936 void
 937 in6_pcbpurgeif0(head, ifp)
 938         struct in6pcb *head;
 939         struct ifnet *ifp;
 940 {
 941         struct in6pcb *in6p;
 942         struct ip6_moptions *im6o;
 943         struct in6_multi_mship *imm, *nimm;
 944
 945         for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
 946                 im6o = in6p->in6p_moptions;
 947                 if ((in6p->inp_vflag & INP_IPV6) &&
 948                     im6o) {
 949                         /*
 950                          * Unselect the outgoing interface if it is being
 951                          * detached.
 952                          */
 953                         if (im6o->im6o_multicast_ifp == ifp)
 954                                 im6o->im6o_multicast_ifp = NULL;
 955
 956                         /*
 957                          * Drop multicast group membership if we joined
 958                          * through the interface being detached.
 959                          * XXX controversial - is it really legal for kernel
 960                          * to force this?
 961                          */
 962                         for (imm = im6o->im6o_memberships.lh_first;
 963                              imm != NULL; imm = nimm) {
 964                                 nimm = imm->i6mm_chain.le_next;
 965                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
 966                                         LIST_REMOVE(imm, i6mm_chain);
 967                                         in6_delmulti(imm->i6mm_maddr);
 968                                         free(imm, M_IPMADDR);
 969                                 }
 970                         }
 971                 }
 972         }
 973 }
 974
 975 /*
 976  * Check for alternatives when higher level complains
 977  * about service problems.  For now, invalidate cached
 978  * routing information.  If the route was created dynamically
 979  * (by a redirect), time to try a default gateway again.
 980  */
 981 void
 982 in6_losing(in6p)
 983         struct inpcb *in6p;
 984 {
 985         struct rtentry *rt;
 986         struct rt_addrinfo info;
 987
 988         if ((rt = in6p->in6p_route.ro_rt) != NULL) {
 989                 bzero((caddr_t)&info, sizeof(info));
 990                 info.rti_flags = rt->rt_flags;
 991                 info.rti_info[RTAX_DST] = rt_key(rt);
 992                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 993                 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 994                 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
 995                 if (rt->rt_flags & RTF_DYNAMIC)
 996                         (void)rtrequest1(RTM_DELETE, &info, NULL);
 997                 in6p->in6p_route.ro_rt = NULL;
 998                 rtfree(rt);
 999                 /*
1000                  * A new route can be allocated
1001                  * the next time output is attempted.
1002                  */
1003         }
1004 }
1005
1006 /*
1007  * After a routing change, flush old routing
1008  * and allocate a (hopefully) better one.
1009  */
1010 void
1011 in6_rtchange(inp, errno)
1012         struct inpcb *inp;
1013         int errno;
1014 {
1015         if (inp->in6p_route.ro_rt) {
1016                 rtfree(inp->in6p_route.ro_rt);
1017                 inp->in6p_route.ro_rt = 0;
1018                 /*
1019                  * A new route can be allocated the next time
1020                  * output is attempted.
1021                  */
1022         }
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         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 }