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. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      @(#)in_pcb.c    8.2 (Berkeley) 1/4/94
  63  */
  64
  65 #include "opt_inet.h"
  66 #include "opt_inet6.h"
  67 #include "opt_ipsec.h"
  68
  69 #include <sys/param.h>
  70 #include <sys/systm.h>
  71 #include <sys/malloc.h>
  72 #include <sys/mbuf.h>
  73 #include <sys/domain.h>
  74 #include <sys/protosw.h>
  75 #include <sys/socket.h>
  76 #include <sys/socketvar.h>
  77 #include <sys/sockio.h>
  78 #include <sys/errno.h>
  79 #include <sys/time.h>
  80 #include <sys/proc.h>
  81 #include <sys/priv.h>
  82 #include <sys/jail.h>
  83
  84 #include <sys/thread2.h>
  85 #include <sys/msgport2.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 <netproto/key/key.h>
 113 #endif /* IPSEC */
 114
 115 #ifdef FAST_IPSEC
 116 #include <netproto/ipsec/ipsec.h>
 117 #include <netproto/ipsec/ipsec6.h>
 118 #include <netproto/ipsec/key.h>
 119 #define IPSEC
 120 #endif /* FAST_IPSEC */
 121
 122 struct  in6_addr zeroin6_addr;
 123
 124 int
 125 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 126 {
 127         struct socket *so = inp->inp_socket;
 128         struct sockaddr_in6 *sin6 = NULL;
 129         struct sockaddr_in6 jsin6;
 130         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 131         struct proc *p = td->td_proc;
 132         struct ucred *cred = NULL;
 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 (p)
 143                 cred = p->p_ucred;
 144         if (nam) {
 145                 sin6 = (struct sockaddr_in6 *)nam;
 146                 if (nam->sa_len != sizeof(*sin6))
 147                         return (EINVAL);
 148                 /*
 149                  * family check.
 150                  */
 151                 if (nam->sa_family != AF_INET6)
 152                         return (EAFNOSUPPORT);
 153
 154                 if (!prison_replace_wildcards(td, nam))
 155                         return (EINVAL);
 156
 157                 /* KAME hack: embed scopeid */
 158                 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0)
 159                         return EINVAL;
 160                 /* this must be cleared for ifa_ifwithaddr() */
 161                 sin6->sin6_scope_id = 0;
 162
 163                 lport = sin6->sin6_port;
 164                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 165                         /*
 166                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 167                          * allow compepte duplication of binding if
 168                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 169                          * and a multicast address is bound on both
 170                          * new and duplicated sockets.
 171                          */
 172                         if (so->so_options & SO_REUSEADDR)
 173                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 174                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 175                         struct ifaddr *ia = NULL;
 176
 177                         sin6->sin6_port = 0;            /* yech... */
 178                         if (!prison_replace_wildcards(td, (struct sockaddr *)sin6)) {
 179                                 sin6->sin6_addr = kin6addr_any;
 180                                 return(EINVAL);
 181                         }
 182                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == NULL)
 183                                 return (EADDRNOTAVAIL);
 184
 185                         /*
 186                          * XXX: bind to an anycast address might accidentally
 187                          * cause sending a packet with anycast source address.
 188                          * We should allow to bind to a deprecated address, since
 189                          * the application dare to use it.
 190                          */
 191                         if (ia &&
 192                             ((struct in6_ifaddr *)ia)->ia6_flags &
 193                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
 194                                 return (EADDRNOTAVAIL);
 195                         }
 196                 }
 197                 if (lport) {
 198                         struct inpcb *t;
 199
 200                         /* GROSS */
 201                         if (ntohs(lport) < IPV6PORT_RESERVED && cred &&
 202                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))
 203                                 return (EACCES);
 204                         if (so->so_cred->cr_uid != 0 &&
 205                             !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 206                                 t = in6_pcblookup_local(pcbinfo,
 207                                     &sin6->sin6_addr, lport,
 208                                     INPLOOKUP_WILDCARD, cred);
 209                                 if (t &&
 210                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 211                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 212                                      (t->inp_socket->so_options &
 213                                       SO_REUSEPORT) == 0) &&
 214                                     (so->so_cred->cr_uid !=
 215                                      t->inp_socket->so_cred->cr_uid))
 216                                         return (EADDRINUSE);
 217                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 218                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 219                                         struct sockaddr_in sin;
 220
 221                                         in6_sin6_2_sin(&sin, sin6);
 222                                         t = in_pcblookup_local(pcbinfo,
 223                                                 sin.sin_addr, lport,
 224                                                 INPLOOKUP_WILDCARD, cred);
 225                                         if (t &&
 226                                             (so->so_cred->cr_uid !=
 227                                              t->inp_socket->so_cred->cr_uid) &&
 228                                             (ntohl(t->inp_laddr.s_addr) !=
 229                                              INADDR_ANY ||
 230                                              INP_SOCKAF(so) ==
 231                                              INP_SOCKAF(t->inp_socket)))
 232                                                 return (EADDRINUSE);
 233                                 }
 234                         }
 235                         if (cred && cred->cr_prison &&
 236                             !prison_replace_wildcards(td, nam))
 237                                 return(EADDRNOTAVAIL);
 238                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 239                                                 lport, wild, cred);
 240                         if (t && (reuseport & t->inp_socket->so_options) == 0)
 241                                 return (EADDRINUSE);
 242                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 243                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 244                                 struct sockaddr_in sin;
 245
 246                                 in6_sin6_2_sin(&sin, sin6);
 247                                 t = in_pcblookup_local(pcbinfo,
 248                                                        sin.sin_addr, lport,
 249                                                        wild, cred);
 250                                 if (t &&
 251                                     (reuseport & t->inp_socket->so_options)
 252                                     == 0 &&
 253                                     (ntohl(t->inp_laddr.s_addr)
 254                                      != INADDR_ANY ||
 255                                      INP_SOCKAF(so) ==
 256                                      INP_SOCKAF(t->inp_socket)))
 257                                         return (EADDRINUSE);
 258                         }
 259                 }
 260                 inp->in6p_laddr = sin6->sin6_addr;
 261         }
 262         if (lport == 0) {
 263                 int e;
 264
 265                 jsin6.sin6_addr = inp->in6p_laddr;
 266                 jsin6.sin6_family = AF_INET6;
 267                 if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin6)) {
 268                         inp->in6p_laddr = kin6addr_any;
 269                         inp->inp_lport = 0;
 270                         return (EINVAL);
 271                 }
 272
 273                 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, td)) != 0)
 274                         return (e);
 275         }
 276         else {
 277                 inp->inp_lport = lport;
 278                 if (in_pcbinsporthash(inp) != 0) {
 279                         inp->in6p_laddr = kin6addr_any;
 280                         inp->inp_lport = 0;
 281                         return (EAGAIN);
 282                 }
 283         }
 284         return (0);
 285 }
 286
 287 /*
 288  *   Transform old in6_pcbconnect() into an inner subroutine for new
 289  *   in6_pcbconnect(): Do some validity-checking on the remote
 290  *   address (in mbuf 'nam') and then determine local host address
 291  *   (i.e., which interface) to use to access that remote host.
 292  *
 293  *   This preserves definition of in6_pcbconnect(), while supporting a
 294  *   slightly different version for T/TCP.  (This is more than
 295  *   a bit of a kludge, but cleaning up the internal interfaces would
 296  *   have forced minor changes in every protocol).
 297  */
 298
 299 int
 300 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 301              struct in6_addr **plocal_addr6, struct thread *td)
 302 {
 303         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 304         struct ifnet *ifp = NULL;
 305         int error = 0;
 306
 307         if (nam->sa_len != sizeof (*sin6))
 308                 return (EINVAL);
 309         if (sin6->sin6_family != AF_INET6)
 310                 return (EAFNOSUPPORT);
 311         if (sin6->sin6_port == 0)
 312                 return (EADDRNOTAVAIL);
 313
 314         /* KAME hack: embed scopeid */
 315         if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
 316                 return EINVAL;
 317
 318         if (in6_ifaddr) {
 319                 /*
 320                  * If the destination address is UNSPECIFIED addr,
 321                  * use the loopback addr, e.g ::1.
 322                  */
 323                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 324                         sin6->sin6_addr = kin6addr_loopback;
 325         }
 326         {
 327                 /*
 328                  * XXX: in6_selectsrc might replace the bound local address
 329                  * with the address specified by setsockopt(IPV6_PKTINFO).
 330                  * Is it the intended behavior?
 331                  */
 332                 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
 333                                               inp->in6p_moptions,
 334                                               &inp->in6p_route,
 335                                               &inp->in6p_laddr, &error, td);
 336                 if (*plocal_addr6 == NULL) {
 337                         if (error == 0)
 338                                 error = EADDRNOTAVAIL;
 339                         return (error);
 340                 }
 341                 /*
 342                  * Don't do pcblookup call here; return interface in
 343                  * plocal_addr6
 344                  * and exit to caller, that will do the lookup.
 345                  */
 346         }
 347
 348         if (inp->in6p_route.ro_rt)
 349                 ifp = inp->in6p_route.ro_rt->rt_ifp;
 350
 351         return (0);
 352 }
 353
 354 /*
 355  * Outer subroutine:
 356  * Connect from a socket to a specified address.
 357  * Both address and port must be specified in argument sin.
 358  * If don't have a local address for this socket yet,
 359  * then pick one.
 360  */
 361 int
 362 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 363 {
 364         struct in6_addr *addr6;
 365         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 366         int error;
 367
 368         /*
 369          * Call inner routine, to assign local interface address.
 370          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 371          */
 372         if ((error = in6_pcbladdr(inp, nam, &addr6, td)) != 0)
 373                 return (error);
 374
 375         if (in6_pcblookup_hash(inp->inp_cpcbinfo, &sin6->sin6_addr,
 376                                sin6->sin6_port,
 377                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 378                               ? addr6 : &inp->in6p_laddr,
 379                               inp->inp_lport, 0, NULL) != NULL) {
 380                 return (EADDRINUSE);
 381         }
 382         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 383                 if (inp->inp_lport == 0) {
 384                         error = in6_pcbbind(inp, NULL, td);
 385                         if (error)
 386                                 return (error);
 387                 }
 388                 inp->in6p_laddr = *addr6;
 389         }
 390         inp->in6p_faddr = sin6->sin6_addr;
 391         inp->inp_fport = sin6->sin6_port;
 392         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 393         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 394         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
 395                 inp->in6p_flowinfo |=
 396                     (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
 397
 398         in_pcbinsconnhash(inp);
 399         return (0);
 400 }
 401
 402 #if 0
 403 /*
 404  * Return an IPv6 address, which is the most appropriate for given
 405  * destination and user specified options.
 406  * If necessary, this function lookups the routing table and return
 407  * an entry to the caller for later use.
 408  */
 409 struct in6_addr *
 410 in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
 411               struct ip6_moptions *mopts, struct route_in6 *ro,
 412               struct in6_addr *laddr, int *errorp, struct thread *td)
 413 {
 414         struct sockaddr_in6 jsin6;
 415         struct ucred *cred = NULL;
 416         struct in6_addr *dst;
 417         struct in6_ifaddr *ia6 = 0;
 418         struct in6_pktinfo *pi = NULL;
 419         int jailed = 0;
 420
 421         if (td && td->td_proc && td->td_proc->p_ucred)
 422                 cred = td->td_proc->p_ucred;
 423         if (cred && cred->cr_prison)
 424                 jailed = 1;
 425         jsin6.sin6_family = AF_INET6;
 426         dst = &dstsock->sin6_addr;
 427         *errorp = 0;
 428
 429         /*
 430          * If the source address is explicitly specified by the caller,
 431          * use it.
 432          */
 433         if (opts && (pi = opts->ip6po_pktinfo) &&
 434             !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
 435                 jsin6.sin6_addr = pi->ipi6_addr;
 436                 if (jailed && !jailed_ip(cred->cr_prison,
 437                     (struct sockaddr *)&jsin6)) {
 438                         return(0);
 439                 } else {
 440                         return (&pi->ipi6_addr);
 441                 }
 442         }
 443
 444         /*
 445          * If the source address is not specified but the socket(if any)
 446          * is already bound, use the bound address.
 447          */
 448         if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) {
 449                 jsin6.sin6_addr = *laddr;
 450                 if (jailed && !jailed_ip(cred->cr_prison,
 451                     (struct sockaddr *)&jsin6)) {
 452                         return(0);
 453                 } else {
 454                         return (laddr);
 455                 }
 456         }
 457
 458         /*
 459          * If the caller doesn't specify the source address but
 460          * the outgoing interface, use an address associated with
 461          * the interface.
 462          */
 463         if (pi && pi->ipi6_ifindex) {
 464                 /* XXX boundary check is assumed to be already done. */
 465                 ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex],
 466                                        dst);
 467
 468                 if (ia6 && jailed) {
 469                         jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 470                         if (!jailed_ip(cred->cr_prison,
 471                                 (struct sockaddr *)&jsin6))
 472                                 ia6 = 0;
 473                 }
 474
 475                 if (ia6 == 0) {
 476                         *errorp = EADDRNOTAVAIL;
 477                         return (0);
 478                 }
 479                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
 480         }
 481
 482         /*
 483          * If the destination address is a link-local unicast address or
 484          * a multicast address, and if the outgoing interface is specified
 485          * by the sin6_scope_id filed, use an address associated with the
 486          * interface.
 487          * XXX: We're now trying to define more specific semantics of
 488          *      sin6_scope_id field, so this part will be rewritten in
 489          *      the near future.
 490          */
 491         if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
 492             dstsock->sin6_scope_id) {
 493                 /*
 494                  * I'm not sure if boundary check for scope_id is done
 495                  * somewhere...
 496                  */
 497                 if (dstsock->sin6_scope_id < 0 ||
 498                     if_index < dstsock->sin6_scope_id) {
 499                         *errorp = ENXIO; /* XXX: better error? */
 500                         return (0);
 501                 }
 502                 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
 503                                        dst);
 504
 505                 if (ia6 && jailed) {
 506                         jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 507                         if (!jailed_ip(cred->cr_prison,
 508                                 (struct sockaddr *)&jsin6))
 509                                 ia6 = 0;
 510                 }
 511
 512                 if (ia6 == 0) {
 513                         *errorp = EADDRNOTAVAIL;
 514                         return (0);
 515                 }
 516                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
 517         }
 518
 519         /*
 520          * If the destination address is a multicast address and
 521          * the outgoing interface for the address is specified
 522          * by the caller, use an address associated with the interface.
 523          * There is a sanity check here; if the destination has node-local
 524          * scope, the outgoing interfacde should be a loopback address.
 525          * Even if the outgoing interface is not specified, we also
 526          * choose a loopback interface as the outgoing interface.
 527          */
 528         if (!jailed && IN6_IS_ADDR_MULTICAST(dst)) {
 529                 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
 530
 531                 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
 532                         ifp = &loif[0];
 533                 }
 534
 535                 if (ifp) {
 536                         ia6 = in6_ifawithscope(ifp, dst);
 537                         if (ia6 == 0) {
 538                                 *errorp = EADDRNOTAVAIL;
 539                                 return (0);
 540                         }
 541                         return (&ia6->ia_addr.sin6_addr);
 542                 }
 543         }
 544
 545         /*
 546          * If the next hop address for the packet is specified
 547          * by caller, use an address associated with the route
 548          * to the next hop.
 549          */
 550         {
 551                 struct sockaddr_in6 *sin6_next;
 552                 struct rtentry *rt;
 553
 554                 if (opts && opts->ip6po_nexthop) {
 555                         sin6_next = satosin6(opts->ip6po_nexthop);
 556                         rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
 557                         if (rt) {
 558                                 ia6 = in6_ifawithscope(rt->rt_ifp, dst);
 559                                 if (ia6 == 0)
 560                                         ia6 = ifatoia6(rt->rt_ifa);
 561                         }
 562                         if (ia6 && jailed) {
 563                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 564                                 if (!jailed_ip(cred->cr_prison,
 565                                         (struct sockaddr *)&jsin6))
 566                                         ia6 = 0;
 567                         }
 568
 569                         if (ia6 == 0) {
 570                                 *errorp = EADDRNOTAVAIL;
 571                                 return (0);
 572                         }
 573                         return (&satosin6(&ia6->ia_addr)->sin6_addr);
 574                 }
 575         }
 576
 577         /*
 578          * If route is known or can be allocated now,
 579          * our src addr is taken from the i/f, else punt.
 580          */
 581         if (ro) {
 582                 if (ro->ro_rt &&
 583                     !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
 584                         RTFREE(ro->ro_rt);
 585                         ro->ro_rt = NULL;
 586                 }
 587                 if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL) {
 588                         struct sockaddr_in6 *dst6;
 589
 590                         /* No route yet, so try to acquire one */
 591                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
 592                         dst6 = &ro->ro_dst;
 593                         dst6->sin6_family = AF_INET6;
 594                         dst6->sin6_len = sizeof(struct sockaddr_in6);
 595                         dst6->sin6_addr = *dst;
 596                         if (!jailed && IN6_IS_ADDR_MULTICAST(dst)) {
 597                                 ro->ro_rt =
 598                                   rtpurelookup((struct sockaddr *)&ro->ro_dst);
 599                         } else {
 600                                 rtalloc((struct route *)ro);
 601                         }
 602                 }
 603
 604                 /*
 605                  * in_pcbconnect() checks out IFF_LOOPBACK to skip using
 606                  * the address. But we don't know why it does so.
 607                  * It is necessary to ensure the scope even for lo0
 608                  * so doesn't check out IFF_LOOPBACK.
 609                  */
 610
 611                 if (ro->ro_rt) {
 612                         ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst);
 613                         if (ia6 && jailed) {
 614                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 615                                 if (!jailed_ip(cred->cr_prison,
 616                                         (struct sockaddr *)&jsin6))
 617                                         ia6 = 0;
 618                         }
 619
 620                         if (ia6 == 0) /* xxx scope error ?*/
 621                                 ia6 = ifatoia6(ro->ro_rt->rt_ifa);
 622
 623                         if (ia6 && jailed) {
 624                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 625                                 if (!jailed_ip(cred->cr_prison,
 626                                         (struct sockaddr *)&jsin6))
 627                                         ia6 = 0;
 628                         }
 629                 }
 630                 if (ia6 == 0) {
 631                         *errorp = EHOSTUNREACH; /* no route */
 632                         return (0);
 633                 }
 634                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
 635         }
 636
 637         *errorp = EADDRNOTAVAIL;
 638         return (0);
 639 }
 640
 641 /*
 642  * Default hop limit selection. The precedence is as follows:
 643  * 1. Hoplimit valued specified via ioctl.
 644  * 2. (If the outgoing interface is detected) the current
 645  *     hop limit of the interface specified by router advertisement.
 646  * 3. The system default hoplimit.
 647 */
 648 int
 649 in6_selecthlim(struct in6pcb *in6p, struct ifnet *ifp)
 650 {
 651         if (in6p && in6p->in6p_hops >= 0)
 652                 return (in6p->in6p_hops);
 653         else if (ifp)
 654                 return (ND_IFINFO(ifp)->chlim);
 655         else
 656                 return (ip6_defhlim);
 657 }
 658 #endif
 659
 660 void
 661 in6_pcbdisconnect(struct inpcb *inp)
 662 {
 663         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 664         inp->inp_fport = 0;
 665         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 666         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 667         in_pcbremconnhash(inp);
 668         if (inp->inp_socket->so_state & SS_NOFDREF)
 669                 in6_pcbdetach(inp);
 670 }
 671
 672 void
 673 in6_pcbdetach(struct inpcb *inp)
 674 {
 675         struct socket *so = inp->inp_socket;
 676         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 677
 678 #ifdef IPSEC
 679         if (inp->in6p_sp != NULL)
 680                 ipsec6_delete_pcbpolicy(inp);
 681 #endif /* IPSEC */
 682         inp->inp_gencnt = ++ipi->ipi_gencnt;
 683         in_pcbremlists(inp);
 684         so->so_pcb = NULL;
 685         KKASSERT((so->so_state & SS_ASSERTINPROG) == 0);
 686         sofree(so);             /* remove pcb ref */
 687
 688         if (inp->in6p_options)
 689                 m_freem(inp->in6p_options);
 690         ip6_freepcbopts(inp->in6p_outputopts);
 691         ip6_freemoptions(inp->in6p_moptions);
 692         if (inp->in6p_route.ro_rt)
 693                 rtfree(inp->in6p_route.ro_rt);
 694         /* Check and free IPv4 related resources in case of mapped addr */
 695         if (inp->inp_options)
 696                 m_free(inp->inp_options);
 697         ip_freemoptions(inp->inp_moptions);
 698
 699         inp->inp_vflag = 0;
 700         kfree(inp, M_PCB);
 701 }
 702
 703 /*
 704  * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
 705  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 706  * in struct pr_usrreqs, so that protocols can just reference then directly
 707  * without the need for a wrapper function.  The socket must have a valid
 708  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 709  * except through a kernel programming error, so it is acceptable to panic
 710  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 711  * because there actually /is/ a programming error somewhere... XXX)
 712  */
 713 void
 714 in6_setsockaddr_dispatch(netmsg_t msg)
 715 {
 716         int error;
 717
 718         error = in6_setsockaddr(msg->sockaddr.base.nm_so, msg->sockaddr.nm_nam);
 719         lwkt_replymsg(&msg->sockaddr.base.lmsg, error);
 720 }
 721
 722 int
 723 in6_setsockaddr(struct socket *so, struct sockaddr **nam)
 724 {
 725         struct inpcb *inp;
 726         struct sockaddr_in6 *sin6;
 727
 728         /*
 729          * Do the malloc first in case it blocks.
 730          */
 731         sin6 = kmalloc(sizeof *sin6, M_SONAME, M_WAITOK | M_ZERO);
 732         sin6->sin6_family = AF_INET6;
 733         sin6->sin6_len = sizeof(*sin6);
 734
 735         crit_enter();
 736         inp = so->so_pcb;
 737         if (!inp) {
 738                 crit_exit();
 739                 kfree(sin6, M_SONAME);
 740                 return EINVAL;
 741         }
 742         sin6->sin6_port = inp->inp_lport;
 743         sin6->sin6_addr = inp->in6p_laddr;
 744         crit_exit();
 745         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 746                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 747         else
 748                 sin6->sin6_scope_id = 0;        /*XXX*/
 749         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 750                 sin6->sin6_addr.s6_addr16[1] = 0;
 751
 752         *nam = (struct sockaddr *)sin6;
 753         return 0;
 754 }
 755
 756 void
 757 in6_setpeeraddr_dispatch(netmsg_t msg)
 758 {
 759         int error;
 760
 761         error = in6_setpeeraddr(msg->peeraddr.base.nm_so, msg->peeraddr.nm_nam);
 762         lwkt_replymsg(&msg->peeraddr.base.lmsg, error);
 763 }
 764
 765 int
 766 in6_setpeeraddr(struct socket *so, struct sockaddr **nam)
 767 {
 768         struct inpcb *inp;
 769         struct sockaddr_in6 *sin6;
 770
 771         /*
 772          * Do the malloc first in case it blocks.
 773          */
 774         sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
 775         sin6->sin6_family = AF_INET6;
 776         sin6->sin6_len = sizeof(struct sockaddr_in6);
 777
 778         crit_enter();
 779         inp = so->so_pcb;
 780         if (!inp) {
 781                 crit_exit();
 782                 kfree(sin6, M_SONAME);
 783                 return EINVAL;
 784         }
 785         sin6->sin6_port = inp->inp_fport;
 786         sin6->sin6_addr = inp->in6p_faddr;
 787         crit_exit();
 788         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 789                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 790         else
 791                 sin6->sin6_scope_id = 0;        /*XXX*/
 792         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 793                 sin6->sin6_addr.s6_addr16[1] = 0;
 794
 795         *nam = (struct sockaddr *)sin6;
 796         return 0;
 797 }
 798
 799 void
 800 in6_mapped_sockaddr_dispatch(netmsg_t msg)
 801 {
 802         int error;
 803
 804         error = in6_mapped_sockaddr(msg->sockaddr.base.nm_so,
 805                                     msg->sockaddr.nm_nam);
 806         lwkt_replymsg(&msg->sockaddr.base.lmsg, error);
 807 }
 808
 809 int
 810 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 811 {
 812         struct  inpcb *inp = so->so_pcb;
 813         int     error;
 814
 815         if (inp == NULL)
 816                 return EINVAL;
 817         if (inp->inp_vflag & INP_IPV4) {
 818                 error = in_setsockaddr(so, nam);
 819                 if (error == 0)
 820                         in6_sin_2_v4mapsin6_in_sock(nam);
 821         } else
 822         /* scope issues will be handled in in6_setsockaddr(). */
 823         error = in6_setsockaddr(so, nam);
 824
 825         return error;
 826 }
 827
 828 int
 829 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 830 {
 831         struct  inpcb *inp = so->so_pcb;
 832         int     error;
 833
 834         if (inp == NULL)
 835                 return EINVAL;
 836         if (inp->inp_vflag & INP_IPV4) {
 837                 error = in_setpeeraddr(so, nam);
 838                 if (error == 0)
 839                         in6_sin_2_v4mapsin6_in_sock(nam);
 840         } else
 841         /* scope issues will be handled in in6_setpeeraddr(). */
 842         error = in6_setpeeraddr(so, nam);
 843
 844         return error;
 845 }
 846
 847 void
 848 in6_mapped_peeraddr_dispatch(netmsg_t msg)
 849 {
 850         int error;
 851
 852         error = in6_mapped_peeraddr(msg->base.nm_so, msg->peeraddr.nm_nam);
 853         lwkt_replymsg(&msg->base.lmsg, error);
 854 }
 855
 856 /*
 857  * Pass some notification to all connections of a protocol
 858  * associated with address dst.  The local address and/or port numbers
 859  * may be specified to limit the search.  The "usual action" will be
 860  * taken, depending on the ctlinput cmd.  The caller must filter any
 861  * cmds that are uninteresting (e.g., no error in the map).
 862  * Call the protocol specific routine (if any) to report
 863  * any errors for each matching socket.
 864  *
 865  * Must be called under crit_enter().
 866  */
 867 void
 868 in6_pcbnotify(struct inpcbhead *head, struct sockaddr *dst, in_port_t fport,
 869               const struct sockaddr *src, in_port_t lport, int cmd, int arg,
 870               void (*notify) (struct inpcb *, int))
 871 {
 872         struct inpcb *inp, *ninp;
 873         struct sockaddr_in6 sa6_src, *sa6_dst;
 874         u_int32_t flowinfo;
 875
 876         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 877                 return;
 878
 879         sa6_dst = (struct sockaddr_in6 *)dst;
 880         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 881                 return;
 882
 883         /*
 884          * note that src can be NULL when we get notify by local fragmentation.
 885          */
 886         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 887         flowinfo = sa6_src.sin6_flowinfo;
 888
 889         /*
 890          * Redirects go to all references to the destination,
 891          * and use in6_rtchange to invalidate the route cache.
 892          * Dead host indications: also use in6_rtchange to invalidate
 893          * the cache, and deliver the error to all the sockets.
 894          * Otherwise, if we have knowledge of the local port and address,
 895          * deliver only to that socket.
 896          */
 897         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 898                 fport = 0;
 899                 lport = 0;
 900                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 901
 902                 if (cmd != PRC_HOSTDEAD)
 903                         notify = in6_rtchange;
 904         }
 905         if (cmd != PRC_MSGSIZE)
 906                 arg = inet6ctlerrmap[cmd];
 907         crit_enter();
 908         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 909                 ninp = LIST_NEXT(inp, inp_list);
 910
 911                 if (inp->inp_flags & INP_PLACEMARKER)
 912                         continue;
 913
 914                 if ((inp->inp_vflag & INP_IPV6) == 0)
 915                         continue;
 916                 /*
 917                  * If the error designates a new path MTU for a destination
 918                  * and the application (associated with this socket) wanted to
 919                  * know the value, notify. Note that we notify for all
 920                  * disconnected sockets if the corresponding application
 921                  * wanted. This is because some UDP applications keep sending
 922                  * sockets disconnected.
 923                  * XXX: should we avoid to notify the value to TCP sockets?
 924                  */
 925                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
 926                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 927                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
 928                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, &arg);
 929                 }
 930
 931                 /*
 932                  * Detect if we should notify the error. If no source and
 933                  * destination ports are specifed, but non-zero flowinfo and
 934                  * local address match, notify the error. This is the case
 935                  * when the error is delivered with an encrypted buffer
 936                  * by ESP. Otherwise, just compare addresses and ports
 937                  * as usual.
 938                  */
 939                 if (lport == 0 && fport == 0 && flowinfo &&
 940                     inp->inp_socket != NULL &&
 941                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
 942                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 943                         goto do_notify;
 944                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 945                                              &sa6_dst->sin6_addr) ||
 946                          inp->inp_socket == 0 ||
 947                          (lport && inp->inp_lport != lport) ||
 948                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 949                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 950                                               &sa6_src.sin6_addr)) ||
 951                          (fport && inp->inp_fport != fport))
 952                         continue;
 953
 954 do_notify:
 955                 if (notify)
 956                         (*notify)(inp, arg);
 957         }
 958         crit_exit();
 959 }
 960
 961 /*
 962  * Lookup a PCB based on the local address and port.
 963  */
 964 struct inpcb *
 965 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
 966                     u_int lport_arg, int wild_okay, struct ucred *cred)
 967 {
 968         struct inpcb *inp;
 969         int matchwild = 3, wildcard;
 970         u_short lport = lport_arg;
 971         struct inpcbporthead *porthash;
 972         struct inpcbport *phd;
 973         struct inpcb *match = NULL;
 974
 975         /*
 976          * If the porthashbase is shared across several cpus we need
 977          * to lock.
 978          */
 979         if (pcbinfo->porttoken)
 980                 lwkt_gettoken(pcbinfo->porttoken);
 981
 982         /*
 983          * Best fit PCB lookup.
 984          *
 985          * First see if this local port is in use by looking on the
 986          * port hash list.
 987          */
 988         porthash = &pcbinfo->porthashbase[
 989                                 INP_PCBPORTHASH(lport, pcbinfo->porthashmask)];
 990         LIST_FOREACH(phd, porthash, phd_hash) {
 991                 if (phd->phd_port == lport)
 992                         break;
 993         }
 994
 995         if (phd != NULL) {
 996                 /*
 997                  * Port is in use by one or more PCBs. Look for best
 998                  * fit.
 999                  */
1000                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1001                         wildcard = 0;
1002                         if ((inp->inp_vflag & INP_IPV6) == 0)
1003                                 continue;
1004                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
1005                                 wildcard++;
1006                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1007                                 if (IN6_IS_ADDR_UNSPECIFIED(laddr))
1008                                         wildcard++;
1009                                 else if (!IN6_ARE_ADDR_EQUAL(
1010                                         &inp->in6p_laddr, laddr))
1011                                         continue;
1012                         } else {
1013                                 if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
1014                                         wildcard++;
1015                         }
1016                         if (wildcard && !wild_okay)
1017                                 continue;
1018                         if (wildcard < matchwild &&
1019                             (cred == NULL ||
1020                              cred->cr_prison ==
1021                                         inp->inp_socket->so_cred->cr_prison)) {
1022                                 match = inp;
1023                                 matchwild = wildcard;
1024                                 if (wildcard == 0)
1025                                         break;
1026                                 else
1027                                         matchwild = wildcard;
1028                         }
1029                 }
1030         }
1031         if (pcbinfo->porttoken)
1032                 lwkt_reltoken(pcbinfo->porttoken);
1033
1034         return (match);
1035 }
1036
1037 void
1038 in6_pcbpurgeif0(struct in6pcb *head, struct ifnet *ifp)
1039 {
1040         struct in6pcb *in6p;
1041         struct ip6_moptions *im6o;
1042         struct in6_multi_mship *imm, *nimm;
1043
1044         for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
1045                 if (in6p->in6p_flags & INP_PLACEMARKER)
1046                         continue;
1047                 im6o = in6p->in6p_moptions;
1048                 if ((in6p->inp_vflag & INP_IPV6) &&
1049                     im6o) {
1050                         /*
1051                          * Unselect the outgoing interface if it is being
1052                          * detached.
1053                          */
1054                         if (im6o->im6o_multicast_ifp == ifp)
1055                                 im6o->im6o_multicast_ifp = NULL;
1056
1057                         /*
1058                          * Drop multicast group membership if we joined
1059                          * through the interface being detached.
1060                          * XXX controversial - is it really legal for kernel
1061                          * to force this?
1062                          */
1063                         for (imm = im6o->im6o_memberships.lh_first;
1064                              imm != NULL; imm = nimm) {
1065                                 nimm = imm->i6mm_chain.le_next;
1066                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
1067                                         LIST_REMOVE(imm, i6mm_chain);
1068                                         in6_delmulti(imm->i6mm_maddr);
1069                                         kfree(imm, M_IPMADDR);
1070                                 }
1071                         }
1072                 }
1073         }
1074 }
1075
1076 /*
1077  * Check for alternatives when higher level complains
1078  * about service problems.  For now, invalidate cached
1079  * routing information.  If the route was created dynamically
1080  * (by a redirect), time to try a default gateway again.
1081  */
1082 void
1083 in6_losing(struct inpcb *in6p)
1084 {
1085         struct rtentry *rt;
1086         struct rt_addrinfo info;
1087
1088         if ((rt = in6p->in6p_route.ro_rt) != NULL) {
1089                 bzero((caddr_t)&info, sizeof(info));
1090                 info.rti_flags = rt->rt_flags;
1091                 info.rti_info[RTAX_DST] = rt_key(rt);
1092                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1093                 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1094                 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
1095                 if (rt->rt_flags & RTF_DYNAMIC) {
1096                         rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1097                             rt_mask(rt), rt->rt_flags, NULL);
1098                 }
1099                 in6p->in6p_route.ro_rt = NULL;
1100                 rtfree(rt);
1101                 /*
1102                  * A new route can be allocated
1103                  * the next time output is attempted.
1104                  */
1105         }
1106 }
1107
1108 /*
1109  * After a routing change, flush old routing
1110  * and allocate a (hopefully) better one.
1111  */
1112 void
1113 in6_rtchange(struct inpcb *inp, int error)
1114 {
1115         if (inp->in6p_route.ro_rt) {
1116                 rtfree(inp->in6p_route.ro_rt);
1117                 inp->in6p_route.ro_rt = 0;
1118                 /*
1119                  * A new route can be allocated the next time
1120                  * output is attempted.
1121                  */
1122         }
1123 }
1124
1125 /*
1126  * Lookup PCB in hash list.
1127  */
1128 struct inpcb *
1129 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1130                    u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
1131                    int wildcard, struct ifnet *ifp)
1132 {
1133         struct inpcbhead *head;
1134         struct inpcb *inp;
1135         struct inpcb *jinp = NULL;
1136         u_short fport = fport_arg, lport = lport_arg;
1137         int faith;
1138
1139         if (faithprefix_p != NULL)
1140                 faith = (*faithprefix_p)(laddr);
1141         else
1142                 faith = 0;
1143
1144         /*
1145          * First look for an exact match.
1146          */
1147         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr->s6_addr32[3] /* XXX */,
1148                                               fport,
1149                                               laddr->s6_addr32[3], /* XXX JH */
1150                                               lport,
1151                                               pcbinfo->hashmask)];
1152         LIST_FOREACH(inp, head, inp_hash) {
1153                 if ((inp->inp_vflag & INP_IPV6) == 0)
1154                         continue;
1155                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1156                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1157                     inp->inp_fport == fport &&
1158                     inp->inp_lport == lport) {
1159                         /*
1160                          * Found.
1161                          */
1162                         if (inp->inp_socket == NULL ||
1163                         inp->inp_socket->so_cred->cr_prison == NULL) {
1164                                 return (inp);
1165                         } else {
1166                                 if  (jinp == NULL)
1167                                         jinp = inp;
1168                         }
1169                 }
1170         }
1171         if (jinp != NULL)
1172                 return(jinp);
1173         if (wildcard) {
1174                 struct inpcontainerhead *chead;
1175                 struct inpcontainer *ic;
1176                 struct inpcb *local_wild = NULL;
1177                 struct inpcb *jinp_wild = NULL;
1178                 struct sockaddr_in6 jsin6;
1179                 struct ucred *cred;
1180
1181                 /*
1182                  * Order of socket selection:
1183                  * 1. non-jailed, non-wild.
1184                  * 2. non-jailed, wild.
1185                  * 3. jailed, non-wild.
1186                  * 4. jailed, wild.
1187                  */
1188                 jsin6.sin6_family = AF_INET6;
1189                 chead = &pcbinfo->wildcardhashbase[INP_PCBWILDCARDHASH(lport,
1190                     pcbinfo->wildcardhashmask)];
1191                 LIST_FOREACH(ic, chead, ic_list) {
1192                         inp = ic->ic_inp;
1193
1194                         if (!(inp->inp_vflag & INP_IPV6))
1195                                 continue;
1196                         if (inp->inp_socket != NULL)
1197                                 cred = inp->inp_socket->so_cred;
1198                         else
1199                                 cred = NULL;
1200
1201                         if (cred != NULL && jailed(cred)) {
1202                                 if (jinp != NULL) {
1203                                         continue;
1204                                 } else {
1205                                         jsin6.sin6_addr = *laddr;
1206                                         if (!jailed_ip(cred->cr_prison,
1207                                             (struct sockaddr *)&jsin6))
1208                                                 continue;
1209                                 }
1210                         }
1211                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1212                             inp->inp_lport == lport) {
1213                                 if (faith && (inp->inp_flags & INP_FAITH) == 0)
1214                                         continue;
1215                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
1216                                                        laddr)) {
1217                                         if (cred != NULL && jailed(cred))
1218                                                 jinp = inp;
1219                                         else
1220                                                 return (inp);
1221                                 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1222                                         if (cred != NULL && jailed(cred))
1223                                                 jinp_wild = inp;
1224                                         else
1225                                                 local_wild = inp;
1226                                 }
1227                         }
1228                 }
1229                 if (local_wild != NULL)
1230                         return (local_wild);
1231                 if (jinp != NULL)
1232                         return (jinp);
1233                 return (jinp_wild);
1234         }
1235
1236         /*
1237          * Not found.
1238          */
1239         return (NULL);
1240 }
1241
1242 void
1243 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
1244 {
1245         struct ip6_hdr *ip;
1246
1247         ip = mtod(m, struct ip6_hdr *);
1248         bzero(sin6, sizeof(*sin6));
1249         sin6->sin6_len = sizeof(*sin6);
1250         sin6->sin6_family = AF_INET6;
1251         sin6->sin6_addr = ip->ip6_src;
1252         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1253                 sin6->sin6_addr.s6_addr16[1] = 0;
1254         sin6->sin6_scope_id =
1255                 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1256                 ? m->m_pkthdr.rcvif->if_index : 0;
1257
1258         return;
1259 }
1260
1261 static void
1262 in6_savefaddr(struct socket *so, const struct sockaddr *faddr)
1263 {
1264         struct sockaddr_in6 *sin6;
1265
1266         KASSERT(faddr->sa_family == AF_INET6,
1267             ("not AF_INET6 faddr %d", faddr->sa_family));
1268
1269         sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
1270         sin6->sin6_family = AF_INET6;
1271         sin6->sin6_len = sizeof(*sin6);
1272
1273         sin6->sin6_port = ((const struct sockaddr_in6 *)faddr)->sin6_port;
1274         sin6->sin6_addr = ((const struct sockaddr_in6 *)faddr)->sin6_addr;
1275
1276         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1277                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
1278         else
1279                 sin6->sin6_scope_id = 0;        /*XXX*/
1280         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1281                 sin6->sin6_addr.s6_addr16[1] = 0;
1282
1283         so->so_faddr = (struct sockaddr *)sin6;
1284 }
1285
1286 void
1287 in6_mapped_savefaddr(struct socket *so, const struct sockaddr *faddr)
1288 {
1289         if (faddr->sa_family == AF_INET) {
1290                 in_savefaddr(so, faddr);
1291                 in6_sin_2_v4mapsin6_in_sock(&so->so_faddr);
1292         } else {
1293                 in6_savefaddr(so, faddr);
1294         }
1295 }