sys/netinet6/in6_pcb.c

   1 /*      $FreeBSD: src/sys/netinet6/in6_pcb.c,v 1.10.2.9 2003/01/24 05:11:35 sam Exp $   */
   2 /*      $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $        */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  */
  33
  34 /*
  35  * Copyright (c) 1982, 1986, 1991, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  *      @(#)in_pcb.c    8.2 (Berkeley) 1/4/94
  67  */
  68
  69 #include "opt_inet.h"
  70 #include "opt_inet6.h"
  71 #include "opt_ipsec.h"
  72
  73 #include <sys/param.h>
  74 #include <sys/systm.h>
  75 #include <sys/malloc.h>
  76 #include <sys/mbuf.h>
  77 #include <sys/domain.h>
  78 #include <sys/protosw.h>
  79 #include <sys/socket.h>
  80 #include <sys/socketvar.h>
  81 #include <sys/sockio.h>
  82 #include <sys/errno.h>
  83 #include <sys/time.h>
  84 #include <sys/proc.h>
  85 #include <sys/priv.h>
  86 #include <sys/jail.h>
  87
  88 #include <sys/thread2.h>
  89 #include <sys/msgport2.h>
  90
  91 #include <vm/vm_zone.h>
  92
  93 #include <net/if.h>
  94 #include <net/if_types.h>
  95 #include <net/route.h>
  96
  97 #include <netinet/in.h>
  98 #include <netinet/in_var.h>
  99 #include <netinet/in_systm.h>
 100 #include <netinet/ip6.h>
 101 #include <netinet/ip_var.h>
 102 #include <netinet6/ip6_var.h>
 103 #include <netinet6/nd6.h>
 104 #include <netinet/in_pcb.h>
 105 #include <netinet6/in6_pcb.h>
 106
 107 #ifdef IPSEC
 108 #include <netinet6/ipsec.h>
 109 #ifdef INET6
 110 #include <netinet6/ipsec6.h>
 111 #endif
 112 #include <netinet6/ah.h>
 113 #ifdef INET6
 114 #include <netinet6/ah6.h>
 115 #endif
 116 #include <netproto/key/key.h>
 117 #endif /* IPSEC */
 118
 119 #ifdef FAST_IPSEC
 120 #include <netproto/ipsec/ipsec.h>
 121 #include <netproto/ipsec/ipsec6.h>
 122 #include <netproto/ipsec/key.h>
 123 #define IPSEC
 124 #endif /* FAST_IPSEC */
 125
 126 struct  in6_addr zeroin6_addr;
 127
 128 int
 129 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 130 {
 131         struct socket *so = inp->inp_socket;
 132         struct sockaddr_in6 *sin6 = NULL;
 133         struct sockaddr_in6 jsin6;
 134         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 135         struct proc *p = td->td_proc;
 136         struct ucred *cred = NULL;
 137         u_short lport = 0;
 138         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 139
 140         if (!in6_ifaddr) /* XXX broken! */
 141                 return (EADDRNOTAVAIL);
 142         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 143                 return (EINVAL);
 144         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 145                 wild = 1;
 146         if (p)
 147                 cred = p->p_ucred;
 148         if (nam) {
 149                 sin6 = (struct sockaddr_in6 *)nam;
 150                 if (nam->sa_len != sizeof(*sin6))
 151                         return (EINVAL);
 152                 /*
 153                  * family check.
 154                  */
 155                 if (nam->sa_family != AF_INET6)
 156                         return (EAFNOSUPPORT);
 157
 158                 if (!prison_replace_wildcards(td, nam))
 159                         return (EINVAL);
 160
 161                 /* KAME hack: embed scopeid */
 162                 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0)
 163                         return EINVAL;
 164                 /* this must be cleared for ifa_ifwithaddr() */
 165                 sin6->sin6_scope_id = 0;
 166
 167                 lport = sin6->sin6_port;
 168                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 169                         /*
 170                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 171                          * allow compepte duplication of binding if
 172                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 173                          * and a multicast address is bound on both
 174                          * new and duplicated sockets.
 175                          */
 176                         if (so->so_options & SO_REUSEADDR)
 177                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 178                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 179                         struct ifaddr *ia = NULL;
 180
 181                         sin6->sin6_port = 0;            /* yech... */
 182                         if (!prison_replace_wildcards(td, (struct sockaddr *)sin6)) {
 183                                 sin6->sin6_addr = kin6addr_any;
 184                                 return(EINVAL);
 185                         }
 186                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == NULL)
 187                                 return (EADDRNOTAVAIL);
 188
 189                         /*
 190                          * XXX: bind to an anycast address might accidentally
 191                          * cause sending a packet with anycast source address.
 192                          * We should allow to bind to a deprecated address, since
 193                          * the application dare to use it.
 194                          */
 195                         if (ia &&
 196                             ((struct in6_ifaddr *)ia)->ia6_flags &
 197                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
 198                                 return (EADDRNOTAVAIL);
 199                         }
 200                 }
 201                 if (lport) {
 202                         struct inpcb *t;
 203
 204                         /* GROSS */
 205                         if (ntohs(lport) < IPV6PORT_RESERVED && cred &&
 206                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))
 207                                 return (EACCES);
 208                         if (so->so_cred->cr_uid != 0 &&
 209                             !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 210                                 t = in6_pcblookup_local(pcbinfo,
 211                                     &sin6->sin6_addr, lport,
 212                                     INPLOOKUP_WILDCARD, cred);
 213                                 if (t &&
 214                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 215                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 216                                      (t->inp_socket->so_options &
 217                                       SO_REUSEPORT) == 0) &&
 218                                     (so->so_cred->cr_uid !=
 219                                      t->inp_socket->so_cred->cr_uid))
 220                                         return (EADDRINUSE);
 221                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 222                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 223                                         struct sockaddr_in sin;
 224
 225                                         in6_sin6_2_sin(&sin, sin6);
 226                                         t = in_pcblookup_local(pcbinfo,
 227                                                 sin.sin_addr, lport,
 228                                                 INPLOOKUP_WILDCARD, cred);
 229                                         if (t &&
 230                                             (so->so_cred->cr_uid !=
 231                                              t->inp_socket->so_cred->cr_uid) &&
 232                                             (ntohl(t->inp_laddr.s_addr) !=
 233                                              INADDR_ANY ||
 234                                              INP_SOCKAF(so) ==
 235                                              INP_SOCKAF(t->inp_socket)))
 236                                                 return (EADDRINUSE);
 237                                 }
 238                         }
 239                         if (cred && cred->cr_prison &&
 240                             !prison_replace_wildcards(td, nam))
 241                                 return(EADDRNOTAVAIL);
 242                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 243                                                 lport, wild, cred);
 244                         if (t && (reuseport & t->inp_socket->so_options) == 0)
 245                                 return (EADDRINUSE);
 246                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 247                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 248                                 struct sockaddr_in sin;
 249
 250                                 in6_sin6_2_sin(&sin, sin6);
 251                                 t = in_pcblookup_local(pcbinfo,
 252                                                        sin.sin_addr, lport,
 253                                                        wild, cred);
 254                                 if (t &&
 255                                     (reuseport & t->inp_socket->so_options)
 256                                     == 0 &&
 257                                     (ntohl(t->inp_laddr.s_addr)
 258                                      != INADDR_ANY ||
 259                                      INP_SOCKAF(so) ==
 260                                      INP_SOCKAF(t->inp_socket)))
 261                                         return (EADDRINUSE);
 262                         }
 263                 }
 264                 inp->in6p_laddr = sin6->sin6_addr;
 265         }
 266         if (lport == 0) {
 267                 int e;
 268
 269                 jsin6.sin6_addr = inp->in6p_laddr;
 270                 jsin6.sin6_family = AF_INET6;
 271                 if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin6)) {
 272                         inp->in6p_laddr = kin6addr_any;
 273                         inp->inp_lport = 0;
 274                         return (EINVAL);
 275                 }
 276
 277                 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, td)) != 0)
 278                         return (e);
 279         }
 280         else {
 281                 inp->inp_lport = lport;
 282                 if (in_pcbinsporthash(inp) != 0) {
 283                         inp->in6p_laddr = kin6addr_any;
 284                         inp->inp_lport = 0;
 285                         return (EAGAIN);
 286                 }
 287         }
 288         return (0);
 289 }
 290
 291 /*
 292  *   Transform old in6_pcbconnect() into an inner subroutine for new
 293  *   in6_pcbconnect(): Do some validity-checking on the remote
 294  *   address (in mbuf 'nam') and then determine local host address
 295  *   (i.e., which interface) to use to access that remote host.
 296  *
 297  *   This preserves definition of in6_pcbconnect(), while supporting a
 298  *   slightly different version for T/TCP.  (This is more than
 299  *   a bit of a kludge, but cleaning up the internal interfaces would
 300  *   have forced minor changes in every protocol).
 301  */
 302
 303 int
 304 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 305              struct in6_addr **plocal_addr6, struct thread *td)
 306 {
 307         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 308         struct ifnet *ifp = NULL;
 309         int error = 0;
 310
 311         if (nam->sa_len != sizeof (*sin6))
 312                 return (EINVAL);
 313         if (sin6->sin6_family != AF_INET6)
 314                 return (EAFNOSUPPORT);
 315         if (sin6->sin6_port == 0)
 316                 return (EADDRNOTAVAIL);
 317
 318         /* KAME hack: embed scopeid */
 319         if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
 320                 return EINVAL;
 321
 322         if (in6_ifaddr) {
 323                 /*
 324                  * If the destination address is UNSPECIFIED addr,
 325                  * use the loopback addr, e.g ::1.
 326                  */
 327                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 328                         sin6->sin6_addr = kin6addr_loopback;
 329         }
 330         {
 331                 /*
 332                  * XXX: in6_selectsrc might replace the bound local address
 333                  * with the address specified by setsockopt(IPV6_PKTINFO).
 334                  * Is it the intended behavior?
 335                  */
 336                 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
 337                                               inp->in6p_moptions,
 338                                               &inp->in6p_route,
 339                                               &inp->in6p_laddr, &error, td);
 340                 if (*plocal_addr6 == NULL) {
 341                         if (error == 0)
 342                                 error = EADDRNOTAVAIL;
 343                         return (error);
 344                 }
 345                 /*
 346                  * Don't do pcblookup call here; return interface in
 347                  * plocal_addr6
 348                  * and exit to caller, that will do the lookup.
 349                  */
 350         }
 351
 352         if (inp->in6p_route.ro_rt)
 353                 ifp = inp->in6p_route.ro_rt->rt_ifp;
 354
 355         return (0);
 356 }
 357
 358 /*
 359  * Outer subroutine:
 360  * Connect from a socket to a specified address.
 361  * Both address and port must be specified in argument sin.
 362  * If don't have a local address for this socket yet,
 363  * then pick one.
 364  */
 365 int
 366 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 367 {
 368         struct in6_addr *addr6;
 369         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 370         int error;
 371
 372         /*
 373          * Call inner routine, to assign local interface address.
 374          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 375          */
 376         if ((error = in6_pcbladdr(inp, nam, &addr6, td)) != 0)
 377                 return (error);
 378
 379         if (in6_pcblookup_hash(inp->inp_cpcbinfo, &sin6->sin6_addr,
 380                                sin6->sin6_port,
 381                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 382                               ? addr6 : &inp->in6p_laddr,
 383                               inp->inp_lport, 0, NULL) != NULL) {
 384                 return (EADDRINUSE);
 385         }
 386         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 387                 if (inp->inp_lport == 0) {
 388                         error = in6_pcbbind(inp, NULL, td);
 389                         if (error)
 390                                 return (error);
 391                 }
 392                 inp->in6p_laddr = *addr6;
 393         }
 394         inp->in6p_faddr = sin6->sin6_addr;
 395         inp->inp_fport = sin6->sin6_port;
 396         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 397         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 398         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
 399                 inp->in6p_flowinfo |=
 400                     (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
 401
 402         in_pcbinsconnhash(inp);
 403         return (0);
 404 }
 405
 406 #if 0
 407 /*
 408  * Return an IPv6 address, which is the most appropriate for given
 409  * destination and user specified options.
 410  * If necessary, this function lookups the routing table and return
 411  * an entry to the caller for later use.
 412  */
 413 struct in6_addr *
 414 in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
 415               struct ip6_moptions *mopts, struct route_in6 *ro,
 416               struct in6_addr *laddr, int *errorp, struct thread *td)
 417 {
 418         struct sockaddr_in6 jsin6;
 419         struct ucred *cred = NULL;
 420         struct in6_addr *dst;
 421         struct in6_ifaddr *ia6 = 0;
 422         struct in6_pktinfo *pi = NULL;
 423         int jailed = 0;
 424
 425         if (td && td->td_proc && td->td_proc->p_ucred)
 426                 cred = td->td_proc->p_ucred;
 427         if (cred && cred->cr_prison)
 428                 jailed = 1;
 429         jsin6.sin6_family = AF_INET6;
 430         dst = &dstsock->sin6_addr;
 431         *errorp = 0;
 432
 433         /*
 434          * If the source address is explicitly specified by the caller,
 435          * use it.
 436          */
 437         if (opts && (pi = opts->ip6po_pktinfo) &&
 438             !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
 439                 jsin6.sin6_addr = pi->ipi6_addr;
 440                 if (jailed && !jailed_ip(cred->cr_prison,
 441                     (struct sockaddr *)&jsin6)) {
 442                         return(0);
 443                 } else {
 444                         return (&pi->ipi6_addr);
 445                 }
 446         }
 447
 448         /*
 449          * If the source address is not specified but the socket(if any)
 450          * is already bound, use the bound address.
 451          */
 452         if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) {
 453                 jsin6.sin6_addr = *laddr;
 454                 if (jailed && !jailed_ip(cred->cr_prison,
 455                     (struct sockaddr *)&jsin6)) {
 456                         return(0);
 457                 } else {
 458                         return (laddr);
 459                 }
 460         }
 461
 462         /*
 463          * If the caller doesn't specify the source address but
 464          * the outgoing interface, use an address associated with
 465          * the interface.
 466          */
 467         if (pi && pi->ipi6_ifindex) {
 468                 /* XXX boundary check is assumed to be already done. */
 469                 ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex],
 470                                        dst);
 471
 472                 if (ia6 && jailed) {
 473                         jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 474                         if (!jailed_ip(cred->cr_prison,
 475                                 (struct sockaddr *)&jsin6))
 476                                 ia6 = 0;
 477                 }
 478
 479                 if (ia6 == 0) {
 480                         *errorp = EADDRNOTAVAIL;
 481                         return (0);
 482                 }
 483                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
 484         }
 485
 486         /*
 487          * If the destination address is a link-local unicast address or
 488          * a multicast address, and if the outgoing interface is specified
 489          * by the sin6_scope_id filed, use an address associated with the
 490          * interface.
 491          * XXX: We're now trying to define more specific semantics of
 492          *      sin6_scope_id field, so this part will be rewritten in
 493          *      the near future.
 494          */
 495         if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
 496             dstsock->sin6_scope_id) {
 497                 /*
 498                  * I'm not sure if boundary check for scope_id is done
 499                  * somewhere...
 500                  */
 501                 if (dstsock->sin6_scope_id < 0 ||
 502                     if_index < dstsock->sin6_scope_id) {
 503                         *errorp = ENXIO; /* XXX: better error? */
 504                         return (0);
 505                 }
 506                 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
 507                                        dst);
 508
 509                 if (ia6 && jailed) {
 510                         jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 511                         if (!jailed_ip(cred->cr_prison,
 512                                 (struct sockaddr *)&jsin6))
 513                                 ia6 = 0;
 514                 }
 515
 516                 if (ia6 == 0) {
 517                         *errorp = EADDRNOTAVAIL;
 518                         return (0);
 519                 }
 520                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
 521         }
 522
 523         /*
 524          * If the destination address is a multicast address and
 525          * the outgoing interface for the address is specified
 526          * by the caller, use an address associated with the interface.
 527          * There is a sanity check here; if the destination has node-local
 528          * scope, the outgoing interfacde should be a loopback address.
 529          * Even if the outgoing interface is not specified, we also
 530          * choose a loopback interface as the outgoing interface.
 531          */
 532         if (!jailed && IN6_IS_ADDR_MULTICAST(dst)) {
 533                 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
 534
 535                 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
 536                         ifp = &loif[0];
 537                 }
 538
 539                 if (ifp) {
 540                         ia6 = in6_ifawithscope(ifp, dst);
 541                         if (ia6 == 0) {
 542                                 *errorp = EADDRNOTAVAIL;
 543                                 return (0);
 544                         }
 545                         return (&ia6->ia_addr.sin6_addr);
 546                 }
 547         }
 548
 549         /*
 550          * If the next hop address for the packet is specified
 551          * by caller, use an address associated with the route
 552          * to the next hop.
 553          */
 554         {
 555                 struct sockaddr_in6 *sin6_next;
 556                 struct rtentry *rt;
 557
 558                 if (opts && opts->ip6po_nexthop) {
 559                         sin6_next = satosin6(opts->ip6po_nexthop);
 560                         rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
 561                         if (rt) {
 562                                 ia6 = in6_ifawithscope(rt->rt_ifp, dst);
 563                                 if (ia6 == 0)
 564                                         ia6 = ifatoia6(rt->rt_ifa);
 565                         }
 566                         if (ia6 && jailed) {
 567                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 568                                 if (!jailed_ip(cred->cr_prison,
 569                                         (struct sockaddr *)&jsin6))
 570                                         ia6 = 0;
 571                         }
 572
 573                         if (ia6 == 0) {
 574                                 *errorp = EADDRNOTAVAIL;
 575                                 return (0);
 576                         }
 577                         return (&satosin6(&ia6->ia_addr)->sin6_addr);
 578                 }
 579         }
 580
 581         /*
 582          * If route is known or can be allocated now,
 583          * our src addr is taken from the i/f, else punt.
 584          */
 585         if (ro) {
 586                 if (ro->ro_rt &&
 587                     !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
 588                         RTFREE(ro->ro_rt);
 589                         ro->ro_rt = NULL;
 590                 }
 591                 if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL) {
 592                         struct sockaddr_in6 *dst6;
 593
 594                         /* No route yet, so try to acquire one */
 595                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
 596                         dst6 = &ro->ro_dst;
 597                         dst6->sin6_family = AF_INET6;
 598                         dst6->sin6_len = sizeof(struct sockaddr_in6);
 599                         dst6->sin6_addr = *dst;
 600                         if (!jailed && IN6_IS_ADDR_MULTICAST(dst)) {
 601                                 ro->ro_rt =
 602                                   rtpurelookup((struct sockaddr *)&ro->ro_dst);
 603                         } else {
 604                                 rtalloc((struct route *)ro);
 605                         }
 606                 }
 607
 608                 /*
 609                  * in_pcbconnect() checks out IFF_LOOPBACK to skip using
 610                  * the address. But we don't know why it does so.
 611                  * It is necessary to ensure the scope even for lo0
 612                  * so doesn't check out IFF_LOOPBACK.
 613                  */
 614
 615                 if (ro->ro_rt) {
 616                         ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst);
 617                         if (ia6 && jailed) {
 618                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 619                                 if (!jailed_ip(cred->cr_prison,
 620                                         (struct sockaddr *)&jsin6))
 621                                         ia6 = 0;
 622                         }
 623
 624                         if (ia6 == 0) /* xxx scope error ?*/
 625                                 ia6 = ifatoia6(ro->ro_rt->rt_ifa);
 626
 627                         if (ia6 && jailed) {
 628                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 629                                 if (!jailed_ip(cred->cr_prison,
 630                                         (struct sockaddr *)&jsin6))
 631                                         ia6 = 0;
 632                         }
 633                 }
 634                 if (ia6 == 0) {
 635                         *errorp = EHOSTUNREACH; /* no route */
 636                         return (0);
 637                 }
 638                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
 639         }
 640
 641         *errorp = EADDRNOTAVAIL;
 642         return (0);
 643 }
 644
 645 /*
 646  * Default hop limit selection. The precedence is as follows:
 647  * 1. Hoplimit valued specified via ioctl.
 648  * 2. (If the outgoing interface is detected) the current
 649  *     hop limit of the interface specified by router advertisement.
 650  * 3. The system default hoplimit.
 651 */
 652 int
 653 in6_selecthlim(struct in6pcb *in6p, struct ifnet *ifp)
 654 {
 655         if (in6p && in6p->in6p_hops >= 0)
 656                 return (in6p->in6p_hops);
 657         else if (ifp)
 658                 return (ND_IFINFO(ifp)->chlim);
 659         else
 660                 return (ip6_defhlim);
 661 }
 662 #endif
 663
 664 void
 665 in6_pcbdisconnect(struct inpcb *inp)
 666 {
 667         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 668         inp->inp_fport = 0;
 669         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 670         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 671         in_pcbremconnhash(inp);
 672         if (inp->inp_socket->so_state & SS_NOFDREF)
 673                 in6_pcbdetach(inp);
 674 }
 675
 676 void
 677 in6_pcbdetach(struct inpcb *inp)
 678 {
 679         struct socket *so = inp->inp_socket;
 680         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 681
 682 #ifdef IPSEC
 683         if (inp->in6p_sp != NULL)
 684                 ipsec6_delete_pcbpolicy(inp);
 685 #endif /* IPSEC */
 686         inp->inp_gencnt = ++ipi->ipi_gencnt;
 687         in_pcbremlists(inp);
 688         so->so_pcb = NULL;
 689         KKASSERT((so->so_state & SS_ASSERTINPROG) == 0);
 690         sofree(so);             /* remove pcb ref */
 691
 692         if (inp->in6p_options)
 693                 m_freem(inp->in6p_options);
 694         ip6_freepcbopts(inp->in6p_outputopts);
 695         ip6_freemoptions(inp->in6p_moptions);
 696         if (inp->in6p_route.ro_rt)
 697                 rtfree(inp->in6p_route.ro_rt);
 698         /* Check and free IPv4 related resources in case of mapped addr */
 699         if (inp->inp_options)
 700                 m_free(inp->inp_options);
 701         ip_freemoptions(inp->inp_moptions);
 702
 703         inp->inp_vflag = 0;
 704         kfree(inp, M_PCB);
 705 }
 706
 707 /*
 708  * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
 709  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 710  * in struct pr_usrreqs, so that protocols can just reference then directly
 711  * without the need for a wrapper function.  The socket must have a valid
 712  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 713  * except through a kernel programming error, so it is acceptable to panic
 714  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 715  * because there actually /is/ a programming error somewhere... XXX)
 716  */
 717 void
 718 in6_setsockaddr_dispatch(netmsg_t msg)
 719 {
 720         int error;
 721
 722         error = in6_setsockaddr(msg->sockaddr.base.nm_so, msg->sockaddr.nm_nam);
 723         lwkt_replymsg(&msg->sockaddr.base.lmsg, error);
 724 }
 725
 726 int
 727 in6_setsockaddr(struct socket *so, struct sockaddr **nam)
 728 {
 729         struct inpcb *inp;
 730         struct sockaddr_in6 *sin6;
 731
 732         /*
 733          * Do the malloc first in case it blocks.
 734          */
 735         sin6 = kmalloc(sizeof *sin6, M_SONAME, M_WAITOK | M_ZERO);
 736         sin6->sin6_family = AF_INET6;
 737         sin6->sin6_len = sizeof(*sin6);
 738
 739         crit_enter();
 740         inp = so->so_pcb;
 741         if (!inp) {
 742                 crit_exit();
 743                 kfree(sin6, M_SONAME);
 744                 return EINVAL;
 745         }
 746         sin6->sin6_port = inp->inp_lport;
 747         sin6->sin6_addr = inp->in6p_laddr;
 748         crit_exit();
 749         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 750                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 751         else
 752                 sin6->sin6_scope_id = 0;        /*XXX*/
 753         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 754                 sin6->sin6_addr.s6_addr16[1] = 0;
 755
 756         *nam = (struct sockaddr *)sin6;
 757         return 0;
 758 }
 759
 760 void
 761 in6_setpeeraddr_dispatch(netmsg_t msg)
 762 {
 763         int error;
 764
 765         error = in6_setpeeraddr(msg->peeraddr.base.nm_so, msg->peeraddr.nm_nam);
 766         lwkt_replymsg(&msg->peeraddr.base.lmsg, error);
 767 }
 768
 769 int
 770 in6_setpeeraddr(struct socket *so, struct sockaddr **nam)
 771 {
 772         struct inpcb *inp;
 773         struct sockaddr_in6 *sin6;
 774
 775         /*
 776          * Do the malloc first in case it blocks.
 777          */
 778         sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
 779         sin6->sin6_family = AF_INET6;
 780         sin6->sin6_len = sizeof(struct sockaddr_in6);
 781
 782         crit_enter();
 783         inp = so->so_pcb;
 784         if (!inp) {
 785                 crit_exit();
 786                 kfree(sin6, M_SONAME);
 787                 return EINVAL;
 788         }
 789         sin6->sin6_port = inp->inp_fport;
 790         sin6->sin6_addr = inp->in6p_faddr;
 791         crit_exit();
 792         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 793                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 794         else
 795                 sin6->sin6_scope_id = 0;        /*XXX*/
 796         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 797                 sin6->sin6_addr.s6_addr16[1] = 0;
 798
 799         *nam = (struct sockaddr *)sin6;
 800         return 0;
 801 }
 802
 803 void
 804 in6_mapped_sockaddr_dispatch(netmsg_t msg)
 805 {
 806         int error;
 807
 808         error = in6_mapped_sockaddr(msg->sockaddr.base.nm_so,
 809                                     msg->sockaddr.nm_nam);
 810         lwkt_replymsg(&msg->sockaddr.base.lmsg, error);
 811 }
 812
 813 int
 814 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 815 {
 816         struct  inpcb *inp = so->so_pcb;
 817         int     error;
 818
 819         if (inp == NULL)
 820                 return EINVAL;
 821         if (inp->inp_vflag & INP_IPV4) {
 822                 error = in_setsockaddr(so, nam);
 823                 if (error == 0)
 824                         in6_sin_2_v4mapsin6_in_sock(nam);
 825         } else
 826         /* scope issues will be handled in in6_setsockaddr(). */
 827         error = in6_setsockaddr(so, nam);
 828
 829         return error;
 830 }
 831
 832 int
 833 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 834 {
 835         struct  inpcb *inp = so->so_pcb;
 836         int     error;
 837
 838         if (inp == NULL)
 839                 return EINVAL;
 840         if (inp->inp_vflag & INP_IPV4) {
 841                 error = in_setpeeraddr(so, nam);
 842                 if (error == 0)
 843                         in6_sin_2_v4mapsin6_in_sock(nam);
 844         } else
 845         /* scope issues will be handled in in6_setpeeraddr(). */
 846         error = in6_setpeeraddr(so, nam);
 847
 848         return error;
 849 }
 850
 851 void
 852 in6_mapped_peeraddr_dispatch(netmsg_t msg)
 853 {
 854         int error;
 855
 856         error = in6_mapped_peeraddr(msg->base.nm_so, msg->peeraddr.nm_nam);
 857         lwkt_replymsg(&msg->base.lmsg, error);
 858 }
 859
 860 /*
 861  * Pass some notification to all connections of a protocol
 862  * associated with address dst.  The local address and/or port numbers
 863  * may be specified to limit the search.  The "usual action" will be
 864  * taken, depending on the ctlinput cmd.  The caller must filter any
 865  * cmds that are uninteresting (e.g., no error in the map).
 866  * Call the protocol specific routine (if any) to report
 867  * any errors for each matching socket.
 868  *
 869  * Must be called under crit_enter().
 870  */
 871 void
 872 in6_pcbnotify(struct inpcbhead *head, struct sockaddr *dst, in_port_t fport,
 873               const struct sockaddr *src, in_port_t lport, int cmd, int arg,
 874               void (*notify) (struct inpcb *, int))
 875 {
 876         struct inpcb *inp, *ninp;
 877         struct sockaddr_in6 sa6_src, *sa6_dst;
 878         u_int32_t flowinfo;
 879
 880         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 881                 return;
 882
 883         sa6_dst = (struct sockaddr_in6 *)dst;
 884         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 885                 return;
 886
 887         /*
 888          * note that src can be NULL when we get notify by local fragmentation.
 889          */
 890         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 891         flowinfo = sa6_src.sin6_flowinfo;
 892
 893         /*
 894          * Redirects go to all references to the destination,
 895          * and use in6_rtchange to invalidate the route cache.
 896          * Dead host indications: also use in6_rtchange to invalidate
 897          * the cache, and deliver the error to all the sockets.
 898          * Otherwise, if we have knowledge of the local port and address,
 899          * deliver only to that socket.
 900          */
 901         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 902                 fport = 0;
 903                 lport = 0;
 904                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 905
 906                 if (cmd != PRC_HOSTDEAD)
 907                         notify = in6_rtchange;
 908         }
 909         if (cmd != PRC_MSGSIZE)
 910                 arg = inet6ctlerrmap[cmd];
 911         crit_enter();
 912         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 913                 ninp = LIST_NEXT(inp, inp_list);
 914
 915                 if (inp->inp_flags & INP_PLACEMARKER)
 916                         continue;
 917
 918                 if ((inp->inp_vflag & INP_IPV6) == 0)
 919                         continue;
 920                 /*
 921                  * If the error designates a new path MTU for a destination
 922                  * and the application (associated with this socket) wanted to
 923                  * know the value, notify. Note that we notify for all
 924                  * disconnected sockets if the corresponding application
 925                  * wanted. This is because some UDP applications keep sending
 926                  * sockets disconnected.
 927                  * XXX: should we avoid to notify the value to TCP sockets?
 928                  */
 929                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
 930                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 931                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
 932                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, &arg);
 933                 }
 934
 935                 /*
 936                  * Detect if we should notify the error. If no source and
 937                  * destination ports are specifed, but non-zero flowinfo and
 938                  * local address match, notify the error. This is the case
 939                  * when the error is delivered with an encrypted buffer
 940                  * by ESP. Otherwise, just compare addresses and ports
 941                  * as usual.
 942                  */
 943                 if (lport == 0 && fport == 0 && flowinfo &&
 944                     inp->inp_socket != NULL &&
 945                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
 946                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 947                         goto do_notify;
 948                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 949                                              &sa6_dst->sin6_addr) ||
 950                          inp->inp_socket == 0 ||
 951                          (lport && inp->inp_lport != lport) ||
 952                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 953                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 954                                               &sa6_src.sin6_addr)) ||
 955                          (fport && inp->inp_fport != fport))
 956                         continue;
 957
 958 do_notify:
 959                 if (notify)
 960                         (*notify)(inp, arg);
 961         }
 962         crit_exit();
 963 }
 964
 965 /*
 966  * Lookup a PCB based on the local address and port.
 967  */
 968 struct inpcb *
 969 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
 970                     u_int lport_arg, int wild_okay, struct ucred *cred)
 971 {
 972         struct inpcb *inp;
 973         int matchwild = 3, wildcard;
 974         u_short lport = lport_arg;
 975         struct inpcbporthead *porthash;
 976         struct inpcbport *phd;
 977         struct inpcb *match = NULL;
 978
 979         /*
 980          * If the porthashbase is shared across several cpus we need
 981          * to lock.
 982          */
 983         if (pcbinfo->porttoken)
 984                 lwkt_gettoken(pcbinfo->porttoken);
 985
 986         /*
 987          * Best fit PCB lookup.
 988          *
 989          * First see if this local port is in use by looking on the
 990          * port hash list.
 991          */
 992         porthash = &pcbinfo->porthashbase[
 993                                 INP_PCBPORTHASH(lport, pcbinfo->porthashmask)];
 994         LIST_FOREACH(phd, porthash, phd_hash) {
 995                 if (phd->phd_port == lport)
 996                         break;
 997         }
 998
 999         if (phd != NULL) {
1000                 /*
1001                  * Port is in use by one or more PCBs. Look for best
1002                  * fit.
1003                  */
1004                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1005                         wildcard = 0;
1006                         if ((inp->inp_vflag & INP_IPV6) == 0)
1007                                 continue;
1008                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
1009                                 wildcard++;
1010                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1011                                 if (IN6_IS_ADDR_UNSPECIFIED(laddr))
1012                                         wildcard++;
1013                                 else if (!IN6_ARE_ADDR_EQUAL(
1014                                         &inp->in6p_laddr, laddr))
1015                                         continue;
1016                         } else {
1017                                 if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
1018                                         wildcard++;
1019                         }
1020                         if (wildcard && !wild_okay)
1021                                 continue;
1022                         if (wildcard < matchwild &&
1023                             (cred == NULL ||
1024                              cred->cr_prison ==
1025                                         inp->inp_socket->so_cred->cr_prison)) {
1026                                 match = inp;
1027                                 matchwild = wildcard;
1028                                 if (wildcard == 0)
1029                                         break;
1030                                 else
1031                                         matchwild = wildcard;
1032                         }
1033                 }
1034         }
1035         if (pcbinfo->porttoken)
1036                 lwkt_reltoken(pcbinfo->porttoken);
1037
1038         return (match);
1039 }
1040
1041 void
1042 in6_pcbpurgeif0(struct in6pcb *head, struct ifnet *ifp)
1043 {
1044         struct in6pcb *in6p;
1045         struct ip6_moptions *im6o;
1046         struct in6_multi_mship *imm, *nimm;
1047
1048         for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
1049                 if (in6p->in6p_flags & INP_PLACEMARKER)
1050                         continue;
1051                 im6o = in6p->in6p_moptions;
1052                 if ((in6p->inp_vflag & INP_IPV6) &&
1053                     im6o) {
1054                         /*
1055                          * Unselect the outgoing interface if it is being
1056                          * detached.
1057                          */
1058                         if (im6o->im6o_multicast_ifp == ifp)
1059                                 im6o->im6o_multicast_ifp = NULL;
1060
1061                         /*
1062                          * Drop multicast group membership if we joined
1063                          * through the interface being detached.
1064                          * XXX controversial - is it really legal for kernel
1065                          * to force this?
1066                          */
1067                         for (imm = im6o->im6o_memberships.lh_first;
1068                              imm != NULL; imm = nimm) {
1069                                 nimm = imm->i6mm_chain.le_next;
1070                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
1071                                         LIST_REMOVE(imm, i6mm_chain);
1072                                         in6_delmulti(imm->i6mm_maddr);
1073                                         kfree(imm, M_IPMADDR);
1074                                 }
1075                         }
1076                 }
1077         }
1078 }
1079
1080 /*
1081  * Check for alternatives when higher level complains
1082  * about service problems.  For now, invalidate cached
1083  * routing information.  If the route was created dynamically
1084  * (by a redirect), time to try a default gateway again.
1085  */
1086 void
1087 in6_losing(struct inpcb *in6p)
1088 {
1089         struct rtentry *rt;
1090         struct rt_addrinfo info;
1091
1092         if ((rt = in6p->in6p_route.ro_rt) != NULL) {
1093                 bzero((caddr_t)&info, sizeof(info));
1094                 info.rti_flags = rt->rt_flags;
1095                 info.rti_info[RTAX_DST] = rt_key(rt);
1096                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1097                 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1098                 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
1099                 if (rt->rt_flags & RTF_DYNAMIC)
1100                         rtrequest1_global(RTM_DELETE, &info, NULL, NULL);
1101                 in6p->in6p_route.ro_rt = NULL;
1102                 rtfree(rt);
1103                 /*
1104                  * A new route can be allocated
1105                  * the next time output is attempted.
1106                  */
1107         }
1108 }
1109
1110 /*
1111  * After a routing change, flush old routing
1112  * and allocate a (hopefully) better one.
1113  */
1114 void
1115 in6_rtchange(struct inpcb *inp, int error)
1116 {
1117         if (inp->in6p_route.ro_rt) {
1118                 rtfree(inp->in6p_route.ro_rt);
1119                 inp->in6p_route.ro_rt = 0;
1120                 /*
1121                  * A new route can be allocated the next time
1122                  * output is attempted.
1123                  */
1124         }
1125 }
1126
1127 /*
1128  * Lookup PCB in hash list.
1129  */
1130 struct inpcb *
1131 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1132                    u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
1133                    int wildcard, struct ifnet *ifp)
1134 {
1135         struct inpcbhead *head;
1136         struct inpcb *inp;
1137         struct inpcb *jinp = NULL;
1138         u_short fport = fport_arg, lport = lport_arg;
1139         int faith;
1140
1141         if (faithprefix_p != NULL)
1142                 faith = (*faithprefix_p)(laddr);
1143         else
1144                 faith = 0;
1145
1146         /*
1147          * First look for an exact match.
1148          */
1149         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr->s6_addr32[3] /* XXX */,
1150                                               fport,
1151                                               laddr->s6_addr32[3], /* XXX JH */
1152                                               lport,
1153                                               pcbinfo->hashmask)];
1154         LIST_FOREACH(inp, head, inp_hash) {
1155                 if ((inp->inp_vflag & INP_IPV6) == 0)
1156                         continue;
1157                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1158                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1159                     inp->inp_fport == fport &&
1160                     inp->inp_lport == lport) {
1161                         /*
1162                          * Found.
1163                          */
1164                         if (inp->inp_socket == NULL ||
1165                         inp->inp_socket->so_cred->cr_prison == NULL) {
1166                                 return (inp);
1167                         } else {
1168                                 if  (jinp == NULL)
1169                                         jinp = inp;
1170                         }
1171                 }
1172         }
1173         if (jinp != NULL)
1174                 return(jinp);
1175         if (wildcard) {
1176                 struct inpcontainerhead *chead;
1177                 struct inpcontainer *ic;
1178                 struct inpcb *local_wild = NULL;
1179                 struct inpcb *jinp_wild = NULL;
1180                 struct sockaddr_in6 jsin6;
1181                 struct ucred *cred;
1182
1183                 /*
1184                  * Order of socket selection:
1185                  * 1. non-jailed, non-wild.
1186                  * 2. non-jailed, wild.
1187                  * 3. jailed, non-wild.
1188                  * 4. jailed, wild.
1189                  */
1190                 jsin6.sin6_family = AF_INET6;
1191                 chead = &pcbinfo->wildcardhashbase[INP_PCBWILDCARDHASH(lport,
1192                     pcbinfo->wildcardhashmask)];
1193                 LIST_FOREACH(ic, chead, ic_list) {
1194                         inp = ic->ic_inp;
1195
1196                         if (!(inp->inp_vflag & INP_IPV6))
1197                                 continue;
1198                         if (inp->inp_socket != NULL)
1199                                 cred = inp->inp_socket->so_cred;
1200                         else
1201                                 cred = NULL;
1202
1203                         if (cred != NULL && jailed(cred)) {
1204                                 if (jinp != NULL) {
1205                                         continue;
1206                                 } else {
1207                                         jsin6.sin6_addr = *laddr;
1208                                         if (!jailed_ip(cred->cr_prison,
1209                                             (struct sockaddr *)&jsin6))
1210                                                 continue;
1211                                 }
1212                         }
1213                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1214                             inp->inp_lport == lport) {
1215                                 if (faith && (inp->inp_flags & INP_FAITH) == 0)
1216                                         continue;
1217                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
1218                                                        laddr)) {
1219                                         if (cred != NULL && jailed(cred))
1220                                                 jinp = inp;
1221                                         else
1222                                                 return (inp);
1223                                 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1224                                         if (cred != NULL && jailed(cred))
1225                                                 jinp_wild = inp;
1226                                         else
1227                                                 local_wild = inp;
1228                                 }
1229                         }
1230                 }
1231                 if (local_wild != NULL)
1232                         return (local_wild);
1233                 if (jinp != NULL)
1234                         return (jinp);
1235                 return (jinp_wild);
1236         }
1237
1238         /*
1239          * Not found.
1240          */
1241         return (NULL);
1242 }
1243
1244 void
1245 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
1246 {
1247         struct ip6_hdr *ip;
1248
1249         ip = mtod(m, struct ip6_hdr *);
1250         bzero(sin6, sizeof(*sin6));
1251         sin6->sin6_len = sizeof(*sin6);
1252         sin6->sin6_family = AF_INET6;
1253         sin6->sin6_addr = ip->ip6_src;
1254         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1255                 sin6->sin6_addr.s6_addr16[1] = 0;
1256         sin6->sin6_scope_id =
1257                 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1258                 ? m->m_pkthdr.rcvif->if_index : 0;
1259
1260         return;
1261 }
1262
1263 static void
1264 in6_savefaddr(struct socket *so, const struct sockaddr *faddr)
1265 {
1266         struct sockaddr_in6 *sin6;
1267
1268         KASSERT(faddr->sa_family == AF_INET6,
1269             ("not AF_INET6 faddr %d", faddr->sa_family));
1270
1271         sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
1272         sin6->sin6_family = AF_INET6;
1273         sin6->sin6_len = sizeof(*sin6);
1274
1275         sin6->sin6_port = ((const struct sockaddr_in6 *)faddr)->sin6_port;
1276         sin6->sin6_addr = ((const struct sockaddr_in6 *)faddr)->sin6_addr;
1277
1278         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1279                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
1280         else
1281                 sin6->sin6_scope_id = 0;        /*XXX*/
1282         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1283                 sin6->sin6_addr.s6_addr16[1] = 0;
1284
1285         so->so_faddr = (struct sockaddr *)sin6;
1286 }
1287
1288 void
1289 in6_mapped_savefaddr(struct socket *so, const struct sockaddr *faddr)
1290 {
1291         if (faddr->sa_family == AF_INET) {
1292                 in_savefaddr(so, faddr);
1293                 in6_sin_2_v4mapsin6_in_sock(&so->so_faddr);
1294         } else {
1295                 in6_savefaddr(so, faddr);
1296         }
1297 }