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 1.35 2008/09/04 09:08:22 hasso 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/priv.h>
  87 #include <sys/jail.h>
  88 #include <sys/thread2.h>
  89
  90 #include <vm/vm_zone.h>
  91
  92 #include <net/if.h>
  93 #include <net/if_types.h>
  94 #include <net/route.h>
  95
  96 #include <netinet/in.h>
  97 #include <netinet/in_var.h>
  98 #include <netinet/in_systm.h>
  99 #include <netinet/ip6.h>
 100 #include <netinet/ip_var.h>
 101 #include <netinet6/ip6_var.h>
 102 #include <netinet6/nd6.h>
 103 #include <netinet/in_pcb.h>
 104 #include <netinet6/in6_pcb.h>
 105
 106 #ifdef IPSEC
 107 #include <netinet6/ipsec.h>
 108 #ifdef INET6
 109 #include <netinet6/ipsec6.h>
 110 #endif
 111 #include <netinet6/ah.h>
 112 #ifdef INET6
 113 #include <netinet6/ah6.h>
 114 #endif
 115 #include <netproto/key/key.h>
 116 #endif /* IPSEC */
 117
 118 #ifdef FAST_IPSEC
 119 #include <netproto/ipsec/ipsec.h>
 120 #include <netproto/ipsec/ipsec6.h>
 121 #include <netproto/ipsec/key.h>
 122 #define IPSEC
 123 #endif /* FAST_IPSEC */
 124
 125 struct  in6_addr zeroin6_addr;
 126
 127 int
 128 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 129 {
 130         struct socket *so = inp->inp_socket;
 131         struct sockaddr_in6 *sin6 = NULL;
 132         struct sockaddr_in6 jsin6;
 133         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 134         struct proc *p = td->td_proc;
 135         struct ucred *cred = NULL;
 136         u_short lport = 0;
 137         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 138
 139         if (!in6_ifaddr) /* XXX broken! */
 140                 return (EADDRNOTAVAIL);
 141         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 142                 return (EINVAL);
 143         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 144                 wild = 1;
 145         if (p)
 146                 cred = p->p_ucred;
 147         if (nam) {
 148                 sin6 = (struct sockaddr_in6 *)nam;
 149                 if (nam->sa_len != sizeof(*sin6))
 150                         return (EINVAL);
 151                 /*
 152                  * family check.
 153                  */
 154                 if (nam->sa_family != AF_INET6)
 155                         return (EAFNOSUPPORT);
 156
 157                 if (!prison_replace_wildcards(td, nam))
 158                         return (EINVAL);
 159
 160                 /* KAME hack: embed scopeid */
 161                 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0)
 162                         return EINVAL;
 163                 /* this must be cleared for ifa_ifwithaddr() */
 164                 sin6->sin6_scope_id = 0;
 165
 166                 lport = sin6->sin6_port;
 167                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 168                         /*
 169                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 170                          * allow compepte duplication of binding if
 171                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 172                          * and a multicast address is bound on both
 173                          * new and duplicated sockets.
 174                          */
 175                         if (so->so_options & SO_REUSEADDR)
 176                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 177                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 178                         struct ifaddr *ia = NULL;
 179
 180                         sin6->sin6_port = 0;            /* yech... */
 181                         if (!prison_replace_wildcards(td, (struct sockaddr *)sin6)) {
 182                                 sin6->sin6_addr = kin6addr_any;
 183                                 return(EINVAL);
 184                         }
 185                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
 186                                 return (EADDRNOTAVAIL);
 187
 188                         /*
 189                          * XXX: bind to an anycast address might accidentally
 190                          * cause sending a packet with anycast source address.
 191                          * We should allow to bind to a deprecated address, since
 192                          * the application dare to use it.
 193                          */
 194                         if (ia &&
 195                             ((struct in6_ifaddr *)ia)->ia6_flags &
 196                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
 197                                 return (EADDRNOTAVAIL);
 198                         }
 199                 }
 200                 if (lport) {
 201                         struct inpcb *t;
 202
 203                         /* GROSS */
 204                         if (ntohs(lport) < IPV6PORT_RESERVED && cred &&
 205                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))
 206                                 return (EACCES);
 207                         if (so->so_cred->cr_uid != 0 &&
 208                             !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 209                                 t = in6_pcblookup_local(pcbinfo,
 210                                     &sin6->sin6_addr, lport,
 211                                     INPLOOKUP_WILDCARD, cred);
 212                                 if (t &&
 213                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 214                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 215                                      (t->inp_socket->so_options &
 216                                       SO_REUSEPORT) == 0) &&
 217                                     (so->so_cred->cr_uid !=
 218                                      t->inp_socket->so_cred->cr_uid))
 219                                         return (EADDRINUSE);
 220                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 221                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 222                                         struct sockaddr_in sin;
 223
 224                                         in6_sin6_2_sin(&sin, sin6);
 225                                         t = in_pcblookup_local(pcbinfo,
 226                                                 sin.sin_addr, lport,
 227                                                 INPLOOKUP_WILDCARD, cred);
 228                                         if (t &&
 229                                             (so->so_cred->cr_uid !=
 230                                              t->inp_socket->so_cred->cr_uid) &&
 231                                             (ntohl(t->inp_laddr.s_addr) !=
 232                                              INADDR_ANY ||
 233                                              INP_SOCKAF(so) ==
 234                                              INP_SOCKAF(t->inp_socket)))
 235                                                 return (EADDRINUSE);
 236                                 }
 237                         }
 238                         if (cred && cred->cr_prison &&
 239                             !prison_replace_wildcards(td, nam))
 240                                 return(EADDRNOTAVAIL);
 241                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 242                                                 lport, wild, cred);
 243                         if (t && (reuseport & t->inp_socket->so_options) == 0)
 244                                 return (EADDRINUSE);
 245                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 246                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 247                                 struct sockaddr_in sin;
 248
 249                                 in6_sin6_2_sin(&sin, sin6);
 250                                 t = in_pcblookup_local(pcbinfo,
 251                                                        sin.sin_addr, lport,
 252                                                        wild, cred);
 253                                 if (t &&
 254                                     (reuseport & t->inp_socket->so_options)
 255                                     == 0 &&
 256                                     (ntohl(t->inp_laddr.s_addr)
 257                                      != INADDR_ANY ||
 258                                      INP_SOCKAF(so) ==
 259                                      INP_SOCKAF(t->inp_socket)))
 260                                         return (EADDRINUSE);
 261                         }
 262                 }
 263                 inp->in6p_laddr = sin6->sin6_addr;
 264         }
 265         if (lport == 0) {
 266                 int e;
 267
 268                 jsin6.sin6_addr = inp->in6p_laddr;
 269                 jsin6.sin6_family = AF_INET6;
 270                 if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin6)) {
 271                         inp->in6p_laddr = kin6addr_any;
 272                         inp->inp_lport = 0;
 273                         return (EINVAL);
 274                 }
 275
 276                 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, td)) != 0)
 277                         return (e);
 278         }
 279         else {
 280                 inp->inp_lport = lport;
 281                 if (in_pcbinsporthash(inp) != 0) {
 282                         inp->in6p_laddr = kin6addr_any;
 283                         inp->inp_lport = 0;
 284                         return (EAGAIN);
 285                 }
 286         }
 287         return (0);
 288 }
 289
 290 /*
 291  *   Transform old in6_pcbconnect() into an inner subroutine for new
 292  *   in6_pcbconnect(): Do some validity-checking on the remote
 293  *   address (in mbuf 'nam') and then determine local host address
 294  *   (i.e., which interface) to use to access that remote host.
 295  *
 296  *   This preserves definition of in6_pcbconnect(), while supporting a
 297  *   slightly different version for T/TCP.  (This is more than
 298  *   a bit of a kludge, but cleaning up the internal interfaces would
 299  *   have forced minor changes in every protocol).
 300  */
 301
 302 int
 303 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 304              struct in6_addr **plocal_addr6, struct thread *td)
 305 {
 306         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 307         struct ifnet *ifp = NULL;
 308         int error = 0;
 309
 310         if (nam->sa_len != sizeof (*sin6))
 311                 return (EINVAL);
 312         if (sin6->sin6_family != AF_INET6)
 313                 return (EAFNOSUPPORT);
 314         if (sin6->sin6_port == 0)
 315                 return (EADDRNOTAVAIL);
 316
 317         /* KAME hack: embed scopeid */
 318         if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
 319                 return EINVAL;
 320
 321         if (in6_ifaddr) {
 322                 /*
 323                  * If the destination address is UNSPECIFIED addr,
 324                  * use the loopback addr, e.g ::1.
 325                  */
 326                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 327                         sin6->sin6_addr = kin6addr_loopback;
 328         }
 329         {
 330                 /*
 331                  * XXX: in6_selectsrc might replace the bound local address
 332                  * with the address specified by setsockopt(IPV6_PKTINFO).
 333                  * Is it the intended behavior?
 334                  */
 335                 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
 336                                               inp->in6p_moptions,
 337                                               &inp->in6p_route,
 338                                               &inp->in6p_laddr, &error, td);
 339                 if (*plocal_addr6 == 0) {
 340                         if (error == 0)
 341                                 error = EADDRNOTAVAIL;
 342                         return (error);
 343                 }
 344                 /*
 345                  * Don't do pcblookup call here; return interface in
 346                  * plocal_addr6
 347                  * and exit to caller, that will do the lookup.
 348                  */
 349         }
 350
 351         if (inp->in6p_route.ro_rt)
 352                 ifp = inp->in6p_route.ro_rt->rt_ifp;
 353
 354         return (0);
 355 }
 356
 357 /*
 358  * Outer subroutine:
 359  * Connect from a socket to a specified address.
 360  * Both address and port must be specified in argument sin.
 361  * If don't have a local address for this socket yet,
 362  * then pick one.
 363  */
 364 int
 365 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 366 {
 367         struct in6_addr *addr6;
 368         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 369         int error;
 370
 371         /*
 372          * Call inner routine, to assign local interface address.
 373          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 374          */
 375         if ((error = in6_pcbladdr(inp, nam, &addr6, td)) != 0)
 376                 return (error);
 377
 378         if (in6_pcblookup_hash(inp->inp_cpcbinfo, &sin6->sin6_addr,
 379                                sin6->sin6_port,
 380                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 381                               ? addr6 : &inp->in6p_laddr,
 382                               inp->inp_lport, 0, NULL) != NULL) {
 383                 return (EADDRINUSE);
 384         }
 385         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 386                 if (inp->inp_lport == 0) {
 387                         error = in6_pcbbind(inp, NULL, td);
 388                         if (error)
 389                                 return (error);
 390                 }
 391                 inp->in6p_laddr = *addr6;
 392         }
 393         inp->in6p_faddr = sin6->sin6_addr;
 394         inp->inp_fport = sin6->sin6_port;
 395         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 396         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 397         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
 398                 inp->in6p_flowinfo |=
 399                     (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
 400
 401         in_pcbinsconnhash(inp);
 402         return (0);
 403 }
 404
 405 #if 0
 406 /*
 407  * Return an IPv6 address, which is the most appropriate for given
 408  * destination and user specified options.
 409  * If necessary, this function lookups the routing table and return
 410  * an entry to the caller for later use.
 411  */
 412 struct in6_addr *
 413 in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
 414               struct ip6_moptions *mopts, struct route_in6 *ro,
 415               struct in6_addr *laddr, int *errorp, struct thread *td)
 416 {
 417         struct sockaddr_in6 jsin6;
 418         struct ucred *cred = NULL;
 419         struct in6_addr *dst;
 420         struct in6_ifaddr *ia6 = 0;
 421         struct in6_pktinfo *pi = NULL;
 422         int jailed = 0;
 423
 424         if (td && td->td_proc && td->td_proc->p_ucred)
 425                 cred = td->td_proc->p_ucred;
 426         if (cred && cred->cr_prison)
 427                 jailed = 1;
 428         jsin6.sin6_family = AF_INET6;
 429         dst = &dstsock->sin6_addr;
 430         *errorp = 0;
 431
 432         /*
 433          * If the source address is explicitly specified by the caller,
 434          * use it.
 435          */
 436         if (opts && (pi = opts->ip6po_pktinfo) &&
 437             !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
 438                 jsin6.sin6_addr = pi->ipi6_addr;
 439                 if (jailed && !jailed_ip(cred->cr_prison,
 440                     (struct sockaddr *)&jsin6)) {
 441                         return(0);
 442                 } else {
 443                         return (&pi->ipi6_addr);
 444                 }
 445         }
 446
 447         /*
 448          * If the source address is not specified but the socket(if any)
 449          * is already bound, use the bound address.
 450          */
 451         if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) {
 452                 jsin6.sin6_addr = *laddr;
 453                 if (jailed && !jailed_ip(cred->cr_prison,
 454                     (struct sockaddr *)&jsin6)) {
 455                         return(0);
 456                 } else {
 457                         return (laddr);
 458                 }
 459         }
 460
 461         /*
 462          * If the caller doesn't specify the source address but
 463          * the outgoing interface, use an address associated with
 464          * the interface.
 465          */
 466         if (pi && pi->ipi6_ifindex) {
 467                 /* XXX boundary check is assumed to be already done. */
 468                 ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex],
 469                                        dst);
 470
 471                 if (ia6 && jailed) {
 472                         jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 473                         if (!jailed_ip(cred->cr_prison,
 474                                 (struct sockaddr *)&jsin6))
 475                                 ia6 = 0;
 476                 }
 477
 478                 if (ia6 == 0) {
 479                         *errorp = EADDRNOTAVAIL;
 480                         return (0);
 481                 }
 482                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
 483         }
 484
 485         /*
 486          * If the destination address is a link-local unicast address or
 487          * a multicast address, and if the outgoing interface is specified
 488          * by the sin6_scope_id filed, use an address associated with the
 489          * interface.
 490          * XXX: We're now trying to define more specific semantics of
 491          *      sin6_scope_id field, so this part will be rewritten in
 492          *      the near future.
 493          */
 494         if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
 495             dstsock->sin6_scope_id) {
 496                 /*
 497                  * I'm not sure if boundary check for scope_id is done
 498                  * somewhere...
 499                  */
 500                 if (dstsock->sin6_scope_id < 0 ||
 501                     if_index < dstsock->sin6_scope_id) {
 502                         *errorp = ENXIO; /* XXX: better error? */
 503                         return (0);
 504                 }
 505                 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
 506                                        dst);
 507
 508                 if (ia6 && jailed) {
 509                         jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 510                         if (!jailed_ip(cred->cr_prison,
 511                                 (struct sockaddr *)&jsin6))
 512                                 ia6 = 0;
 513                 }
 514
 515                 if (ia6 == 0) {
 516                         *errorp = EADDRNOTAVAIL;
 517                         return (0);
 518                 }
 519                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
 520         }
 521
 522         /*
 523          * If the destination address is a multicast address and
 524          * the outgoing interface for the address is specified
 525          * by the caller, use an address associated with the interface.
 526          * There is a sanity check here; if the destination has node-local
 527          * scope, the outgoing interfacde should be a loopback address.
 528          * Even if the outgoing interface is not specified, we also
 529          * choose a loopback interface as the outgoing interface.
 530          */
 531         if (!jailed && IN6_IS_ADDR_MULTICAST(dst)) {
 532                 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
 533
 534                 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
 535                         ifp = &loif[0];
 536                 }
 537
 538                 if (ifp) {
 539                         ia6 = in6_ifawithscope(ifp, dst);
 540                         if (ia6 == 0) {
 541                                 *errorp = EADDRNOTAVAIL;
 542                                 return (0);
 543                         }
 544                         return (&ia6->ia_addr.sin6_addr);
 545                 }
 546         }
 547
 548         /*
 549          * If the next hop address for the packet is specified
 550          * by caller, use an address associated with the route
 551          * to the next hop.
 552          */
 553         {
 554                 struct sockaddr_in6 *sin6_next;
 555                 struct rtentry *rt;
 556
 557                 if (opts && opts->ip6po_nexthop) {
 558                         sin6_next = satosin6(opts->ip6po_nexthop);
 559                         rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
 560                         if (rt) {
 561                                 ia6 = in6_ifawithscope(rt->rt_ifp, dst);
 562                                 if (ia6 == 0)
 563                                         ia6 = ifatoia6(rt->rt_ifa);
 564                         }
 565                         if (ia6 && jailed) {
 566                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 567                                 if (!jailed_ip(cred->cr_prison,
 568                                         (struct sockaddr *)&jsin6))
 569                                         ia6 = 0;
 570                         }
 571
 572                         if (ia6 == 0) {
 573                                 *errorp = EADDRNOTAVAIL;
 574                                 return (0);
 575                         }
 576                         return (&satosin6(&ia6->ia_addr)->sin6_addr);
 577                 }
 578         }
 579
 580         /*
 581          * If route is known or can be allocated now,
 582          * our src addr is taken from the i/f, else punt.
 583          */
 584         if (ro) {
 585                 if (ro->ro_rt &&
 586                     !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
 587                         RTFREE(ro->ro_rt);
 588                         ro->ro_rt = NULL;
 589                 }
 590                 if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL) {
 591                         struct sockaddr_in6 *dst6;
 592
 593                         /* No route yet, so try to acquire one */
 594                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
 595                         dst6 = &ro->ro_dst;
 596                         dst6->sin6_family = AF_INET6;
 597                         dst6->sin6_len = sizeof(struct sockaddr_in6);
 598                         dst6->sin6_addr = *dst;
 599                         if (!jailed && IN6_IS_ADDR_MULTICAST(dst)) {
 600                                 ro->ro_rt =
 601                                   rtpurelookup((struct sockaddr *)&ro->ro_dst);
 602                         } else {
 603                                 rtalloc((struct route *)ro);
 604                         }
 605                 }
 606
 607                 /*
 608                  * in_pcbconnect() checks out IFF_LOOPBACK to skip using
 609                  * the address. But we don't know why it does so.
 610                  * It is necessary to ensure the scope even for lo0
 611                  * so doesn't check out IFF_LOOPBACK.
 612                  */
 613
 614                 if (ro->ro_rt) {
 615                         ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst);
 616                         if (ia6 && jailed) {
 617                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 618                                 if (!jailed_ip(cred->cr_prison,
 619                                         (struct sockaddr *)&jsin6))
 620                                         ia6 = 0;
 621                         }
 622
 623                         if (ia6 == 0) /* xxx scope error ?*/
 624                                 ia6 = ifatoia6(ro->ro_rt->rt_ifa);
 625
 626                         if (ia6 && jailed) {
 627                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 628                                 if (!jailed_ip(cred->cr_prison,
 629                                         (struct sockaddr *)&jsin6))
 630                                         ia6 = 0;
 631                         }
 632                 }
 633                 if (ia6 == 0) {
 634                         *errorp = EHOSTUNREACH; /* no route */
 635                         return (0);
 636                 }
 637                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
 638         }
 639
 640         *errorp = EADDRNOTAVAIL;
 641         return (0);
 642 }
 643
 644 /*
 645  * Default hop limit selection. The precedence is as follows:
 646  * 1. Hoplimit valued specified via ioctl.
 647  * 2. (If the outgoing interface is detected) the current
 648  *     hop limit of the interface specified by router advertisement.
 649  * 3. The system default hoplimit.
 650 */
 651 int
 652 in6_selecthlim(struct in6pcb *in6p, struct ifnet *ifp)
 653 {
 654         if (in6p && in6p->in6p_hops >= 0)
 655                 return (in6p->in6p_hops);
 656         else if (ifp)
 657                 return (ND_IFINFO(ifp)->chlim);
 658         else
 659                 return (ip6_defhlim);
 660 }
 661 #endif
 662
 663 void
 664 in6_pcbdisconnect(struct inpcb *inp)
 665 {
 666         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 667         inp->inp_fport = 0;
 668         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 669         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 670         in_pcbremconnhash(inp);
 671         if (inp->inp_socket->so_state & SS_NOFDREF)
 672                 in6_pcbdetach(inp);
 673 }
 674
 675 void
 676 in6_pcbdetach(struct inpcb *inp)
 677 {
 678         struct socket *so = inp->inp_socket;
 679         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 680
 681 #ifdef IPSEC
 682         if (inp->in6p_sp != NULL)
 683                 ipsec6_delete_pcbpolicy(inp);
 684 #endif /* IPSEC */
 685         inp->inp_gencnt = ++ipi->ipi_gencnt;
 686         in_pcbremlists(inp);
 687         so->so_pcb = NULL;
 688         sofree(so);
 689
 690         if (inp->in6p_options)
 691                 m_freem(inp->in6p_options);
 692         ip6_freepcbopts(inp->in6p_outputopts);
 693         ip6_freemoptions(inp->in6p_moptions);
 694         if (inp->in6p_route.ro_rt)
 695                 rtfree(inp->in6p_route.ro_rt);
 696         /* Check and free IPv4 related resources in case of mapped addr */
 697         if (inp->inp_options)
 698                 m_free(inp->inp_options);
 699         ip_freemoptions(inp->inp_moptions);
 700
 701         inp->inp_vflag = 0;
 702         zfree(ipi->ipi_zone, inp);
 703 }
 704
 705 /*
 706  * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
 707  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 708  * in struct pr_usrreqs, so that protocols can just reference then directly
 709  * without the need for a wrapper function.  The socket must have a valid
 710  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 711  * except through a kernel programming error, so it is acceptable to panic
 712  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 713  * because there actually /is/ a programming error somewhere... XXX)
 714  */
 715 int
 716 in6_setsockaddr(struct socket *so, struct sockaddr **nam)
 717 {
 718         struct inpcb *inp;
 719         struct sockaddr_in6 *sin6;
 720
 721         /*
 722          * Do the malloc first in case it blocks.
 723          */
 724         MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME,
 725             M_WAITOK | M_ZERO);
 726         sin6->sin6_family = AF_INET6;
 727         sin6->sin6_len = sizeof(*sin6);
 728
 729         crit_enter();
 730         inp = so->so_pcb;
 731         if (!inp) {
 732                 crit_exit();
 733                 kfree(sin6, M_SONAME);
 734                 return EINVAL;
 735         }
 736         sin6->sin6_port = inp->inp_lport;
 737         sin6->sin6_addr = inp->in6p_laddr;
 738         crit_exit();
 739         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 740                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 741         else
 742                 sin6->sin6_scope_id = 0;        /*XXX*/
 743         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 744                 sin6->sin6_addr.s6_addr16[1] = 0;
 745
 746         *nam = (struct sockaddr *)sin6;
 747         return 0;
 748 }
 749
 750 int
 751 in6_setpeeraddr(struct socket *so, struct sockaddr **nam)
 752 {
 753         struct inpcb *inp;
 754         struct sockaddr_in6 *sin6;
 755
 756         /*
 757          * Do the malloc first in case it blocks.
 758          */
 759         MALLOC(sin6, struct sockaddr_in6 *, sizeof(*sin6), M_SONAME,
 760             M_WAITOK | M_ZERO);
 761         sin6->sin6_family = AF_INET6;
 762         sin6->sin6_len = sizeof(struct sockaddr_in6);
 763
 764         crit_enter();
 765         inp = so->so_pcb;
 766         if (!inp) {
 767                 crit_exit();
 768                 kfree(sin6, M_SONAME);
 769                 return EINVAL;
 770         }
 771         sin6->sin6_port = inp->inp_fport;
 772         sin6->sin6_addr = inp->in6p_faddr;
 773         crit_exit();
 774         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 775                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 776         else
 777                 sin6->sin6_scope_id = 0;        /*XXX*/
 778         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 779                 sin6->sin6_addr.s6_addr16[1] = 0;
 780
 781         *nam = (struct sockaddr *)sin6;
 782         return 0;
 783 }
 784
 785 int
 786 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 787 {
 788         struct  inpcb *inp = so->so_pcb;
 789         int     error;
 790
 791         if (inp == NULL)
 792                 return EINVAL;
 793         if (inp->inp_vflag & INP_IPV4) {
 794                 error = in_setsockaddr(so, nam);
 795                 if (error == 0)
 796                         in6_sin_2_v4mapsin6_in_sock(nam);
 797         } else
 798         /* scope issues will be handled in in6_setsockaddr(). */
 799         error = in6_setsockaddr(so, nam);
 800
 801         return error;
 802 }
 803
 804 int
 805 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 806 {
 807         struct  inpcb *inp = so->so_pcb;
 808         int     error;
 809
 810         if (inp == NULL)
 811                 return EINVAL;
 812         if (inp->inp_vflag & INP_IPV4) {
 813                 error = in_setpeeraddr(so, nam);
 814                 if (error == 0)
 815                         in6_sin_2_v4mapsin6_in_sock(nam);
 816         } else
 817         /* scope issues will be handled in in6_setpeeraddr(). */
 818         error = in6_setpeeraddr(so, nam);
 819
 820         return error;
 821 }
 822
 823 /*
 824  * Pass some notification to all connections of a protocol
 825  * associated with address dst.  The local address and/or port numbers
 826  * may be specified to limit the search.  The "usual action" will be
 827  * taken, depending on the ctlinput cmd.  The caller must filter any
 828  * cmds that are uninteresting (e.g., no error in the map).
 829  * Call the protocol specific routine (if any) to report
 830  * any errors for each matching socket.
 831  *
 832  * Must be called under crit_enter().
 833  */
 834 void
 835 in6_pcbnotify(struct inpcbhead *head, struct sockaddr *dst, in_port_t fport,
 836               const struct sockaddr *src, in_port_t lport, int cmd, int arg,
 837               void (*notify) (struct inpcb *, int))
 838 {
 839         struct inpcb *inp, *ninp;
 840         struct sockaddr_in6 sa6_src, *sa6_dst;
 841         u_int32_t flowinfo;
 842
 843         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 844                 return;
 845
 846         sa6_dst = (struct sockaddr_in6 *)dst;
 847         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 848                 return;
 849
 850         /*
 851          * note that src can be NULL when we get notify by local fragmentation.
 852          */
 853         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 854         flowinfo = sa6_src.sin6_flowinfo;
 855
 856         /*
 857          * Redirects go to all references to the destination,
 858          * and use in6_rtchange to invalidate the route cache.
 859          * Dead host indications: also use in6_rtchange to invalidate
 860          * the cache, and deliver the error to all the sockets.
 861          * Otherwise, if we have knowledge of the local port and address,
 862          * deliver only to that socket.
 863          */
 864         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 865                 fport = 0;
 866                 lport = 0;
 867                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 868
 869                 if (cmd != PRC_HOSTDEAD)
 870                         notify = in6_rtchange;
 871         }
 872         if (cmd != PRC_MSGSIZE)
 873                 arg = inet6ctlerrmap[cmd];
 874         crit_enter();
 875         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 876                 ninp = LIST_NEXT(inp, inp_list);
 877
 878                 if (inp->inp_flags & INP_PLACEMARKER)
 879                         continue;
 880
 881                 if ((inp->inp_vflag & INP_IPV6) == 0)
 882                         continue;
 883                 /*
 884                  * If the error designates a new path MTU for a destination
 885                  * and the application (associated with this socket) wanted to
 886                  * know the value, notify. Note that we notify for all
 887                  * disconnected sockets if the corresponding application
 888                  * wanted. This is because some UDP applications keep sending
 889                  * sockets disconnected.
 890                  * XXX: should we avoid to notify the value to TCP sockets?
 891                  */
 892                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
 893                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 894                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
 895                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, arg);
 896                 }
 897
 898                 /*
 899                  * Detect if we should notify the error. If no source and
 900                  * destination ports are specifed, but non-zero flowinfo and
 901                  * local address match, notify the error. This is the case
 902                  * when the error is delivered with an encrypted buffer
 903                  * by ESP. Otherwise, just compare addresses and ports
 904                  * as usual.
 905                  */
 906                 if (lport == 0 && fport == 0 && flowinfo &&
 907                     inp->inp_socket != NULL &&
 908                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
 909                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 910                         goto do_notify;
 911                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 912                                              &sa6_dst->sin6_addr) ||
 913                          inp->inp_socket == 0 ||
 914                          (lport && inp->inp_lport != lport) ||
 915                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 916                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 917                                               &sa6_src.sin6_addr)) ||
 918                          (fport && inp->inp_fport != fport))
 919                         continue;
 920
 921 do_notify:
 922                 if (notify)
 923                         (*notify)(inp, arg);
 924         }
 925         crit_exit();
 926 }
 927
 928 /*
 929  * Lookup a PCB based on the local address and port.
 930  */
 931 struct inpcb *
 932 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
 933                     u_int lport_arg, int wild_okay, struct ucred *cred)
 934 {
 935         struct inpcb *inp;
 936         int matchwild = 3, wildcard;
 937         u_short lport = lport_arg;
 938         struct inpcbporthead *porthash;
 939         struct inpcbport *phd;
 940         struct inpcb *match = NULL;
 941
 942         /*
 943          * Best fit PCB lookup.
 944          *
 945          * First see if this local port is in use by looking on the
 946          * port hash list.
 947          */
 948         porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 949             pcbinfo->porthashmask)];
 950         LIST_FOREACH(phd, porthash, phd_hash) {
 951                 if (phd->phd_port == lport)
 952                         break;
 953         }
 954         if (phd != NULL) {
 955                 /*
 956                  * Port is in use by one or more PCBs. Look for best
 957                  * fit.
 958                  */
 959                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 960                         wildcard = 0;
 961                         if ((inp->inp_vflag & INP_IPV6) == 0)
 962                                 continue;
 963                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 964                                 wildcard++;
 965                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 966                                 if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 967                                         wildcard++;
 968                                 else if (!IN6_ARE_ADDR_EQUAL(
 969                                         &inp->in6p_laddr, laddr))
 970                                         continue;
 971                         } else {
 972                                 if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 973                                         wildcard++;
 974                         }
 975                         if (wildcard && !wild_okay)
 976                                 continue;
 977                         if (wildcard < matchwild &&
 978                             (cred == NULL ||
 979                              cred->cr_prison ==
 980                                         inp->inp_socket->so_cred->cr_prison)) {
 981                                 match = inp;
 982                                 matchwild = wildcard;
 983                                 if (wildcard == 0)
 984                                         break;
 985                                 else
 986                                         matchwild = wildcard;
 987                         }
 988                 }
 989         }
 990         return (match);
 991 }
 992
 993 void
 994 in6_pcbpurgeif0(struct in6pcb *head, struct ifnet *ifp)
 995 {
 996         struct in6pcb *in6p;
 997         struct ip6_moptions *im6o;
 998         struct in6_multi_mship *imm, *nimm;
 999
1000         for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
1001                 if (in6p->in6p_flags & INP_PLACEMARKER)
1002                         continue;
1003                 im6o = in6p->in6p_moptions;
1004                 if ((in6p->inp_vflag & INP_IPV6) &&
1005                     im6o) {
1006                         /*
1007                          * Unselect the outgoing interface if it is being
1008                          * detached.
1009                          */
1010                         if (im6o->im6o_multicast_ifp == ifp)
1011                                 im6o->im6o_multicast_ifp = NULL;
1012
1013                         /*
1014                          * Drop multicast group membership if we joined
1015                          * through the interface being detached.
1016                          * XXX controversial - is it really legal for kernel
1017                          * to force this?
1018                          */
1019                         for (imm = im6o->im6o_memberships.lh_first;
1020                              imm != NULL; imm = nimm) {
1021                                 nimm = imm->i6mm_chain.le_next;
1022                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
1023                                         LIST_REMOVE(imm, i6mm_chain);
1024                                         in6_delmulti(imm->i6mm_maddr);
1025                                         kfree(imm, M_IPMADDR);
1026                                 }
1027                         }
1028                 }
1029         }
1030 }
1031
1032 /*
1033  * Check for alternatives when higher level complains
1034  * about service problems.  For now, invalidate cached
1035  * routing information.  If the route was created dynamically
1036  * (by a redirect), time to try a default gateway again.
1037  */
1038 void
1039 in6_losing(struct inpcb *in6p)
1040 {
1041         struct rtentry *rt;
1042         struct rt_addrinfo info;
1043
1044         if ((rt = in6p->in6p_route.ro_rt) != NULL) {
1045                 bzero((caddr_t)&info, sizeof(info));
1046                 info.rti_flags = rt->rt_flags;
1047                 info.rti_info[RTAX_DST] = rt_key(rt);
1048                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1049                 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1050                 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
1051                 if (rt->rt_flags & RTF_DYNAMIC)
1052                         rtrequest1_global(RTM_DELETE, &info, NULL, NULL);
1053                 in6p->in6p_route.ro_rt = NULL;
1054                 rtfree(rt);
1055                 /*
1056                  * A new route can be allocated
1057                  * the next time output is attempted.
1058                  */
1059         }
1060 }
1061
1062 /*
1063  * After a routing change, flush old routing
1064  * and allocate a (hopefully) better one.
1065  */
1066 void
1067 in6_rtchange(struct inpcb *inp, int error)
1068 {
1069         if (inp->in6p_route.ro_rt) {
1070                 rtfree(inp->in6p_route.ro_rt);
1071                 inp->in6p_route.ro_rt = 0;
1072                 /*
1073                  * A new route can be allocated the next time
1074                  * output is attempted.
1075                  */
1076         }
1077 }
1078
1079 /*
1080  * Lookup PCB in hash list.
1081  */
1082 struct inpcb *
1083 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1084                    u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
1085                    int wildcard, struct ifnet *ifp)
1086 {
1087         struct inpcbhead *head;
1088         struct inpcb *inp;
1089         struct inpcb *jinp = NULL;
1090         u_short fport = fport_arg, lport = lport_arg;
1091         int faith;
1092
1093         if (faithprefix_p != NULL)
1094                 faith = (*faithprefix_p)(laddr);
1095         else
1096                 faith = 0;
1097
1098         /*
1099          * First look for an exact match.
1100          */
1101         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr->s6_addr32[3] /* XXX */,
1102                                               fport,
1103                                               laddr->s6_addr32[3], /* XXX JH */
1104                                               lport,
1105                                               pcbinfo->hashmask)];
1106         LIST_FOREACH(inp, head, inp_hash) {
1107                 if ((inp->inp_vflag & INP_IPV6) == 0)
1108                         continue;
1109                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1110                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1111                     inp->inp_fport == fport &&
1112                     inp->inp_lport == lport) {
1113                         /*
1114                          * Found.
1115                          */
1116                         if (inp->inp_socket == NULL ||
1117                         inp->inp_socket->so_cred->cr_prison == NULL) {
1118                                 return (inp);
1119                         } else {
1120                                 if  (jinp == NULL)
1121                                         jinp = inp;
1122                         }
1123                 }
1124         }
1125         if (jinp != NULL)
1126                 return(jinp);
1127         if (wildcard) {
1128                 struct inpcontainerhead *chead;
1129                 struct inpcontainer *ic;
1130                 struct inpcb *local_wild = NULL;
1131                 struct inpcb *jinp_wild = NULL;
1132                 struct sockaddr_in6 jsin6;
1133                 struct ucred *cred;
1134
1135                 /*
1136                  * Order of socket selection:
1137                  * 1. non-jailed, non-wild.
1138                  * 2. non-jailed, wild.
1139                  * 3. jailed, non-wild.
1140                  * 4. jailed, wild.
1141                  */
1142                 jsin6.sin6_family = AF_INET6;
1143                 chead = &pcbinfo->wildcardhashbase[INP_PCBWILDCARDHASH(lport,
1144                     pcbinfo->wildcardhashmask)];
1145                 LIST_FOREACH(ic, chead, ic_list) {
1146                         inp = ic->ic_inp;
1147
1148                         if (!(inp->inp_vflag & INP_IPV6))
1149                                 continue;
1150                         if (inp->inp_socket != NULL)
1151                                 cred = inp->inp_socket->so_cred;
1152                         else
1153                                 cred = NULL;
1154
1155                         if (cred != NULL && jailed(cred)) {
1156                                 if (jinp != NULL) {
1157                                         continue;
1158                                 } else {
1159                                         jsin6.sin6_addr = *laddr;
1160                                         if (!jailed_ip(cred->cr_prison,
1161                                             (struct sockaddr *)&jsin6))
1162                                                 continue;
1163                                 }
1164                         }
1165                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1166                             inp->inp_lport == lport) {
1167                                 if (faith && (inp->inp_flags & INP_FAITH) == 0)
1168                                         continue;
1169                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
1170                                                        laddr)) {
1171                                         if (cred != NULL && jailed(cred))
1172                                                 jinp = inp;
1173                                         else
1174                                                 return (inp);
1175                                 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1176                                         if (cred != NULL && jailed(cred))
1177                                                 jinp_wild = inp;
1178                                         else
1179                                                 local_wild = inp;
1180                                 }
1181                         }
1182                 }
1183                 if (local_wild != NULL)
1184                         return (local_wild);
1185                 if (jinp != NULL)
1186                         return (jinp);
1187                 return (jinp_wild);
1188         }
1189
1190         /*
1191          * Not found.
1192          */
1193         return (NULL);
1194 }
1195
1196 void
1197 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
1198 {
1199         struct ip6_hdr *ip;
1200
1201         ip = mtod(m, struct ip6_hdr *);
1202         bzero(sin6, sizeof(*sin6));
1203         sin6->sin6_len = sizeof(*sin6);
1204         sin6->sin6_family = AF_INET6;
1205         sin6->sin6_addr = ip->ip6_src;
1206         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1207                 sin6->sin6_addr.s6_addr16[1] = 0;
1208         sin6->sin6_scope_id =
1209                 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1210                 ? m->m_pkthdr.rcvif->if_index : 0;
1211
1212         return;
1213 }