sys/netinet6/in6_pcb.c

   1 /*      $FreeBSD: src/sys/netinet6/in6_pcb.c,v 1.10.2.9 2003/01/24 05:11:35 sam Exp $   */
   2 /*      $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $        */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  */
  33
  34 /*
  35  * Copyright (c) 1982, 1986, 1991, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      @(#)in_pcb.c    8.2 (Berkeley) 1/4/94
  63  */
  64
  65 #include "opt_inet.h"
  66 #include "opt_inet6.h"
  67 #include "opt_ipsec.h"
  68
  69 #include <sys/param.h>
  70 #include <sys/systm.h>
  71 #include <sys/malloc.h>
  72 #include <sys/mbuf.h>
  73 #include <sys/domain.h>
  74 #include <sys/protosw.h>
  75 #include <sys/socket.h>
  76 #include <sys/socketvar.h>
  77 #include <sys/sockio.h>
  78 #include <sys/errno.h>
  79 #include <sys/time.h>
  80 #include <sys/proc.h>
  81 #include <sys/priv.h>
  82 #include <sys/jail.h>
  83
  84 #include <sys/thread2.h>
  85 #include <sys/msgport2.h>
  86
  87 #include <vm/vm_zone.h>
  88
  89 #include <net/if.h>
  90 #include <net/if_types.h>
  91 #include <net/route.h>
  92
  93 #include <netinet/in.h>
  94 #include <netinet/in_var.h>
  95 #include <netinet/in_systm.h>
  96 #include <netinet/ip6.h>
  97 #include <netinet/ip_var.h>
  98 #include <netinet6/ip6_var.h>
  99 #include <netinet6/nd6.h>
 100 #include <netinet/in_pcb.h>
 101 #include <netinet6/in6_pcb.h>
 102
 103 #ifdef IPSEC
 104 #include <netinet6/ipsec.h>
 105 #ifdef INET6
 106 #include <netinet6/ipsec6.h>
 107 #endif
 108 #include <netinet6/ah.h>
 109 #ifdef INET6
 110 #include <netinet6/ah6.h>
 111 #endif
 112 #include <netproto/key/key.h>
 113 #endif /* IPSEC */
 114
 115 #ifdef FAST_IPSEC
 116 #include <netproto/ipsec/ipsec.h>
 117 #include <netproto/ipsec/ipsec6.h>
 118 #include <netproto/ipsec/key.h>
 119 #define IPSEC
 120 #endif /* FAST_IPSEC */
 121
 122 struct  in6_addr zeroin6_addr;
 123
 124 int
 125 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 126 {
 127         struct socket *so = inp->inp_socket;
 128         struct sockaddr_in6 jsin6;
 129         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 130         struct proc *p = td->td_proc;
 131         struct ucred *cred = NULL;
 132         u_short lport = 0;
 133         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 134         int error;
 135
 136         if (!in6_ifaddr) /* XXX broken! */
 137                 return (EADDRNOTAVAIL);
 138         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 139                 return (EINVAL);
 140         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 141                 wild = 1;
 142         if (p)
 143                 cred = p->p_ucred;
 144
 145         /*
 146          * This has to be atomic.  If the porthash is shared across multiple
 147          * protocol threads (aka tcp) then the token will be non-NULL.
 148          */
 149         if (pcbinfo->porttoken)
 150                 lwkt_gettoken(pcbinfo->porttoken);
 151
 152         if (nam) {
 153                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 154
 155                 if (nam->sa_len != sizeof(*sin6)) {
 156                         error = EINVAL;
 157                         goto done;
 158                 }
 159                 /*
 160                  * family check.
 161                  */
 162                 if (nam->sa_family != AF_INET6) {
 163                         error = EAFNOSUPPORT;
 164                         goto done;
 165                 }
 166
 167                 if (!prison_replace_wildcards(td, nam)) {
 168                         error = EINVAL;
 169                         goto done;
 170                 }
 171
 172                 /* KAME hack: embed scopeid */
 173                 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) {
 174                         error = EINVAL;
 175                         goto done;
 176                 }
 177                 /* this must be cleared for ifa_ifwithaddr() */
 178                 sin6->sin6_scope_id = 0;
 179
 180                 lport = sin6->sin6_port;
 181                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 182                         /*
 183                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 184                          * allow compepte duplication of binding if
 185                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 186                          * and a multicast address is bound on both
 187                          * new and duplicated sockets.
 188                          */
 189                         if (so->so_options & SO_REUSEADDR)
 190                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 191                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 192                         struct ifaddr *ia = NULL;
 193
 194                         sin6->sin6_port = 0;            /* yech... */
 195                         if (!prison_replace_wildcards(td, (struct sockaddr *)sin6)) {
 196                                 sin6->sin6_addr = kin6addr_any;
 197                                 error = EINVAL;
 198                                 goto done;
 199                         }
 200                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == NULL) {
 201                                 error = EADDRNOTAVAIL;
 202                                 goto done;
 203                         }
 204
 205                         /*
 206                          * XXX: bind to an anycast address might accidentally
 207                          * cause sending a packet with anycast source address.
 208                          * We should allow to bind to a deprecated address, since
 209                          * the application dare to use it.
 210                          */
 211                         if (ia &&
 212                             ((struct in6_ifaddr *)ia)->ia6_flags &
 213                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
 214                                 error = EADDRNOTAVAIL;
 215                                 goto done;
 216                         }
 217                 }
 218                 if (lport) {
 219                         struct inpcb *t;
 220
 221                         /* GROSS */
 222                         if (ntohs(lport) < IPV6PORT_RESERVED && cred &&
 223                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0)) {
 224                                 error = EACCES;
 225                                 goto done;
 226                         }
 227                         if (so->so_cred->cr_uid != 0 &&
 228                             !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 229                                 t = in6_pcblookup_local(pcbinfo,
 230                                     &sin6->sin6_addr, lport,
 231                                     INPLOOKUP_WILDCARD, cred);
 232                                 if (t &&
 233                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 234                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 235                                      (t->inp_socket->so_options &
 236                                       SO_REUSEPORT) == 0) &&
 237                                     (so->so_cred->cr_uid !=
 238                                      t->inp_socket->so_cred->cr_uid)) {
 239                                         error = EADDRINUSE;
 240                                         goto done;
 241                                 }
 242                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 243                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 244                                         struct sockaddr_in sin;
 245
 246                                         in6_sin6_2_sin(&sin, sin6);
 247                                         t = in_pcblookup_local(pcbinfo,
 248                                                 sin.sin_addr, lport,
 249                                                 INPLOOKUP_WILDCARD, cred);
 250                                         if (t &&
 251                                             (so->so_cred->cr_uid !=
 252                                              t->inp_socket->so_cred->cr_uid) &&
 253                                             (ntohl(t->inp_laddr.s_addr) !=
 254                                              INADDR_ANY ||
 255                                              INP_SOCKAF(so) ==
 256                                              INP_SOCKAF(t->inp_socket))) {
 257                                                 error = EADDRINUSE;
 258                                                 goto done;
 259                                         }
 260                                 }
 261                         }
 262                         if (cred && cred->cr_prison &&
 263                             !prison_replace_wildcards(td, nam)) {
 264                                 error = EADDRNOTAVAIL;
 265                                 goto done;
 266                         }
 267                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 268                                                 lport, wild, cred);
 269                         if (t && (reuseport & t->inp_socket->so_options) == 0) {
 270                                 error = EADDRINUSE;
 271                                 goto done;
 272                         }
 273                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 274                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 275                                 struct sockaddr_in sin;
 276
 277                                 in6_sin6_2_sin(&sin, sin6);
 278                                 t = in_pcblookup_local(pcbinfo,
 279                                                        sin.sin_addr, lport,
 280                                                        wild, cred);
 281                                 if (t &&
 282                                     (reuseport & t->inp_socket->so_options)
 283                                     == 0 &&
 284                                     (ntohl(t->inp_laddr.s_addr)
 285                                      != INADDR_ANY ||
 286                                      INP_SOCKAF(so) ==
 287                                      INP_SOCKAF(t->inp_socket))) {
 288                                         error = EADDRINUSE;
 289                                         goto done;
 290                                 }
 291                         }
 292                 }
 293                 inp->in6p_laddr = sin6->sin6_addr;
 294         }
 295         if (lport == 0) {
 296                 int e;
 297
 298                 jsin6.sin6_addr = inp->in6p_laddr;
 299                 jsin6.sin6_family = AF_INET6;
 300                 if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin6)) {
 301                         inp->in6p_laddr = kin6addr_any;
 302                         inp->inp_lport = 0;
 303                         error = EINVAL;
 304                         goto done;
 305                 }
 306
 307                 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, td)) != 0) {
 308                         error = e;
 309                         goto done;
 310                 }
 311         }
 312         else {
 313                 inp->inp_lport = lport;
 314                 in_pcbinsporthash(inp);
 315         }
 316         error = 0;
 317 done:
 318         if (pcbinfo->porttoken)
 319                 lwkt_reltoken(pcbinfo->porttoken);
 320         return error;
 321 }
 322
 323 /*
 324  *   Transform old in6_pcbconnect() into an inner subroutine for new
 325  *   in6_pcbconnect(): Do some validity-checking on the remote
 326  *   address (in mbuf 'nam') and then determine local host address
 327  *   (i.e., which interface) to use to access that remote host.
 328  *
 329  *   This preserves definition of in6_pcbconnect(), while supporting a
 330  *   slightly different version for T/TCP.  (This is more than
 331  *   a bit of a kludge, but cleaning up the internal interfaces would
 332  *   have forced minor changes in every protocol).
 333  */
 334
 335 int
 336 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 337              struct in6_addr **plocal_addr6, struct thread *td)
 338 {
 339         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 340         struct ifnet *ifp = NULL;
 341         int error = 0;
 342
 343         if (nam->sa_len != sizeof (*sin6))
 344                 return (EINVAL);
 345         if (sin6->sin6_family != AF_INET6)
 346                 return (EAFNOSUPPORT);
 347         if (sin6->sin6_port == 0)
 348                 return (EADDRNOTAVAIL);
 349
 350         /* KAME hack: embed scopeid */
 351         if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
 352                 return EINVAL;
 353
 354         if (in6_ifaddr) {
 355                 /*
 356                  * If the destination address is UNSPECIFIED addr,
 357                  * use the loopback addr, e.g ::1.
 358                  */
 359                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 360                         sin6->sin6_addr = kin6addr_loopback;
 361         }
 362         {
 363                 /*
 364                  * XXX: in6_selectsrc might replace the bound local address
 365                  * with the address specified by setsockopt(IPV6_PKTINFO).
 366                  * Is it the intended behavior?
 367                  */
 368                 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
 369                                               inp->in6p_moptions,
 370                                               &inp->in6p_route,
 371                                               &inp->in6p_laddr, &error, td);
 372                 if (*plocal_addr6 == NULL) {
 373                         if (error == 0)
 374                                 error = EADDRNOTAVAIL;
 375                         return (error);
 376                 }
 377                 /*
 378                  * Don't do pcblookup call here; return interface in
 379                  * plocal_addr6
 380                  * and exit to caller, that will do the lookup.
 381                  */
 382         }
 383
 384         if (inp->in6p_route.ro_rt)
 385                 ifp = inp->in6p_route.ro_rt->rt_ifp;
 386
 387         return (0);
 388 }
 389
 390 /*
 391  * Outer subroutine:
 392  * Connect from a socket to a specified address.
 393  * Both address and port must be specified in argument sin.
 394  * If don't have a local address for this socket yet,
 395  * then pick one.
 396  */
 397 int
 398 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 399 {
 400         struct in6_addr *addr6;
 401         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 402         int error;
 403
 404         /*
 405          * Call inner routine, to assign local interface address.
 406          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 407          */
 408         if ((error = in6_pcbladdr(inp, nam, &addr6, td)) != 0)
 409                 return (error);
 410
 411         if (in6_pcblookup_hash(inp->inp_cpcbinfo, &sin6->sin6_addr,
 412                                sin6->sin6_port,
 413                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 414                               ? addr6 : &inp->in6p_laddr,
 415                               inp->inp_lport, 0, NULL) != NULL) {
 416                 return (EADDRINUSE);
 417         }
 418         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 419                 if (inp->inp_lport == 0) {
 420                         error = in6_pcbbind(inp, NULL, td);
 421                         if (error)
 422                                 return (error);
 423                 }
 424                 inp->in6p_laddr = *addr6;
 425         }
 426         inp->in6p_faddr = sin6->sin6_addr;
 427         inp->inp_fport = sin6->sin6_port;
 428         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 429         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 430         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
 431                 inp->in6p_flowinfo |=
 432                     (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
 433
 434         in_pcbinsconnhash(inp);
 435         return (0);
 436 }
 437
 438 #if 0
 439 /*
 440  * Return an IPv6 address, which is the most appropriate for given
 441  * destination and user specified options.
 442  * If necessary, this function lookups the routing table and return
 443  * an entry to the caller for later use.
 444  */
 445 struct in6_addr *
 446 in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
 447               struct ip6_moptions *mopts, struct route_in6 *ro,
 448               struct in6_addr *laddr, int *errorp, struct thread *td)
 449 {
 450         struct sockaddr_in6 jsin6;
 451         struct ucred *cred = NULL;
 452         struct in6_addr *dst;
 453         struct in6_ifaddr *ia6 = 0;
 454         struct in6_pktinfo *pi = NULL;
 455         int jailed = 0;
 456
 457         if (td && td->td_proc && td->td_proc->p_ucred)
 458                 cred = td->td_proc->p_ucred;
 459         if (cred && cred->cr_prison)
 460                 jailed = 1;
 461         jsin6.sin6_family = AF_INET6;
 462         dst = &dstsock->sin6_addr;
 463         *errorp = 0;
 464
 465         /*
 466          * If the source address is explicitly specified by the caller,
 467          * use it.
 468          */
 469         if (opts && (pi = opts->ip6po_pktinfo) &&
 470             !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
 471                 jsin6.sin6_addr = pi->ipi6_addr;
 472                 if (jailed && !jailed_ip(cred->cr_prison,
 473                     (struct sockaddr *)&jsin6)) {
 474                         return(0);
 475                 } else {
 476                         return (&pi->ipi6_addr);
 477                 }
 478         }
 479
 480         /*
 481          * If the source address is not specified but the socket(if any)
 482          * is already bound, use the bound address.
 483          */
 484         if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) {
 485                 jsin6.sin6_addr = *laddr;
 486                 if (jailed && !jailed_ip(cred->cr_prison,
 487                     (struct sockaddr *)&jsin6)) {
 488                         return(0);
 489                 } else {
 490                         return (laddr);
 491                 }
 492         }
 493
 494         /*
 495          * If the caller doesn't specify the source address but
 496          * the outgoing interface, use an address associated with
 497          * the interface.
 498          */
 499         if (pi && pi->ipi6_ifindex) {
 500                 /* XXX boundary check is assumed to be already done. */
 501                 ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex],
 502                                        dst, cred);
 503
 504                 if (ia6 && jailed) {
 505                         jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 506                         if (!jailed_ip(cred->cr_prison,
 507                                 (struct sockaddr *)&jsin6))
 508                                 ia6 = 0;
 509                 }
 510
 511                 if (ia6 == 0) {
 512                         *errorp = EADDRNOTAVAIL;
 513                         return (0);
 514                 }
 515                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
 516         }
 517
 518         /*
 519          * If the destination address is a link-local unicast address or
 520          * a multicast address, and if the outgoing interface is specified
 521          * by the sin6_scope_id filed, use an address associated with the
 522          * interface.
 523          * XXX: We're now trying to define more specific semantics of
 524          *      sin6_scope_id field, so this part will be rewritten in
 525          *      the near future.
 526          */
 527         if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
 528             dstsock->sin6_scope_id) {
 529                 /*
 530                  * I'm not sure if boundary check for scope_id is done
 531                  * somewhere...
 532                  */
 533                 if (dstsock->sin6_scope_id < 0 ||
 534                     if_index < dstsock->sin6_scope_id) {
 535                         *errorp = ENXIO; /* XXX: better error? */
 536                         return (0);
 537                 }
 538                 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
 539                                        dst, cred);
 540
 541                 if (ia6 && jailed) {
 542                         jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 543                         if (!jailed_ip(cred->cr_prison,
 544                                 (struct sockaddr *)&jsin6))
 545                                 ia6 = 0;
 546                 }
 547
 548                 if (ia6 == 0) {
 549                         *errorp = EADDRNOTAVAIL;
 550                         return (0);
 551                 }
 552                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
 553         }
 554
 555         /*
 556          * If the destination address is a multicast address and
 557          * the outgoing interface for the address is specified
 558          * by the caller, use an address associated with the interface.
 559          * There is a sanity check here; if the destination has node-local
 560          * scope, the outgoing interfacde should be a loopback address.
 561          * Even if the outgoing interface is not specified, we also
 562          * choose a loopback interface as the outgoing interface.
 563          */
 564         if (!jailed && IN6_IS_ADDR_MULTICAST(dst)) {
 565                 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
 566
 567                 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
 568                         ifp = &loif[0];
 569                 }
 570
 571                 if (ifp) {
 572                         ia6 = in6_ifawithscope(ifp, dst, cred);
 573                         if (ia6 == 0) {
 574                                 *errorp = EADDRNOTAVAIL;
 575                                 return (0);
 576                         }
 577                         return (&ia6->ia_addr.sin6_addr);
 578                 }
 579         }
 580
 581         /*
 582          * If the next hop address for the packet is specified
 583          * by caller, use an address associated with the route
 584          * to the next hop.
 585          */
 586         {
 587                 struct sockaddr_in6 *sin6_next;
 588                 struct rtentry *rt;
 589
 590                 if (opts && opts->ip6po_nexthop) {
 591                         sin6_next = satosin6(opts->ip6po_nexthop);
 592                         rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
 593                         if (rt) {
 594                                 ia6 = in6_ifawithscope(rt->rt_ifp, dst, cred);
 595                                 if (ia6 == 0)
 596                                         ia6 = ifatoia6(rt->rt_ifa);
 597                         }
 598                         if (ia6 && jailed) {
 599                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 600                                 if (!jailed_ip(cred->cr_prison,
 601                                         (struct sockaddr *)&jsin6))
 602                                         ia6 = 0;
 603                         }
 604
 605                         if (ia6 == 0) {
 606                                 *errorp = EADDRNOTAVAIL;
 607                                 return (0);
 608                         }
 609                         return (&satosin6(&ia6->ia_addr)->sin6_addr);
 610                 }
 611         }
 612
 613         /*
 614          * If route is known or can be allocated now,
 615          * our src addr is taken from the i/f, else punt.
 616          */
 617         if (ro) {
 618                 if (ro->ro_rt &&
 619                     !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
 620                         RTFREE(ro->ro_rt);
 621                         ro->ro_rt = NULL;
 622                 }
 623                 if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL) {
 624                         struct sockaddr_in6 *dst6;
 625
 626                         /* No route yet, so try to acquire one */
 627                         bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
 628                         dst6 = &ro->ro_dst;
 629                         dst6->sin6_family = AF_INET6;
 630                         dst6->sin6_len = sizeof(struct sockaddr_in6);
 631                         dst6->sin6_addr = *dst;
 632                         if (!jailed && IN6_IS_ADDR_MULTICAST(dst)) {
 633                                 ro->ro_rt =
 634                                   rtpurelookup((struct sockaddr *)&ro->ro_dst);
 635                         } else {
 636                                 rtalloc((struct route *)ro);
 637                         }
 638                 }
 639
 640                 /*
 641                  * in_pcbconnect() checks out IFF_LOOPBACK to skip using
 642                  * the address. But we don't know why it does so.
 643                  * It is necessary to ensure the scope even for lo0
 644                  * so doesn't check out IFF_LOOPBACK.
 645                  */
 646
 647                 if (ro->ro_rt) {
 648                         ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst, cred);
 649                         if (ia6 && jailed) {
 650                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 651                                 if (!jailed_ip(cred->cr_prison,
 652                                         (struct sockaddr *)&jsin6))
 653                                         ia6 = 0;
 654                         }
 655
 656                         if (ia6 == 0) /* xxx scope error ?*/
 657                                 ia6 = ifatoia6(ro->ro_rt->rt_ifa);
 658
 659                         if (ia6 && jailed) {
 660                                 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
 661                                 if (!jailed_ip(cred->cr_prison,
 662                                         (struct sockaddr *)&jsin6))
 663                                         ia6 = 0;
 664                         }
 665                 }
 666                 if (ia6 == 0) {
 667                         *errorp = EHOSTUNREACH; /* no route */
 668                         return (0);
 669                 }
 670                 return (&satosin6(&ia6->ia_addr)->sin6_addr);
 671         }
 672
 673         *errorp = EADDRNOTAVAIL;
 674         return (0);
 675 }
 676
 677 /*
 678  * Default hop limit selection. The precedence is as follows:
 679  * 1. Hoplimit valued specified via ioctl.
 680  * 2. (If the outgoing interface is detected) the current
 681  *     hop limit of the interface specified by router advertisement.
 682  * 3. The system default hoplimit.
 683 */
 684 int
 685 in6_selecthlim(struct in6pcb *in6p, struct ifnet *ifp)
 686 {
 687         if (in6p && in6p->in6p_hops >= 0)
 688                 return (in6p->in6p_hops);
 689         else if (ifp)
 690                 return (ND_IFINFO(ifp)->chlim);
 691         else
 692                 return (ip6_defhlim);
 693 }
 694 #endif
 695
 696 void
 697 in6_pcbdisconnect(struct inpcb *inp)
 698 {
 699         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 700         inp->inp_fport = 0;
 701         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 702         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 703         in_pcbremconnhash(inp);
 704         if (inp->inp_socket->so_state & SS_NOFDREF)
 705                 in6_pcbdetach(inp);
 706 }
 707
 708 void
 709 in6_pcbdetach(struct inpcb *inp)
 710 {
 711         struct socket *so = inp->inp_socket;
 712         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 713
 714 #ifdef IPSEC
 715         if (inp->in6p_sp != NULL)
 716                 ipsec6_delete_pcbpolicy(inp);
 717 #endif /* IPSEC */
 718         inp->inp_gencnt = ++ipi->ipi_gencnt;
 719         in_pcbremlists(inp);
 720         so->so_pcb = NULL;
 721         KKASSERT((so->so_state & SS_ASSERTINPROG) == 0);
 722         sofree(so);             /* remove pcb ref */
 723
 724         if (inp->in6p_options)
 725                 m_freem(inp->in6p_options);
 726         ip6_freepcbopts(inp->in6p_outputopts);
 727         ip6_freemoptions(inp->in6p_moptions);
 728         if (inp->in6p_route.ro_rt)
 729                 rtfree(inp->in6p_route.ro_rt);
 730         /* Check and free IPv4 related resources in case of mapped addr */
 731         if (inp->inp_options)
 732                 m_free(inp->inp_options);
 733         ip_freemoptions(inp->inp_moptions);
 734
 735         inp->inp_vflag = 0;
 736         kfree(inp, M_PCB);
 737 }
 738
 739 /*
 740  * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
 741  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 742  * in struct pr_usrreqs, so that protocols can just reference then directly
 743  * without the need for a wrapper function.  The socket must have a valid
 744  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 745  * except through a kernel programming error, so it is acceptable to panic
 746  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 747  * because there actually /is/ a programming error somewhere... XXX)
 748  */
 749 void
 750 in6_setsockaddr_dispatch(netmsg_t msg)
 751 {
 752         int error;
 753
 754         error = in6_setsockaddr(msg->sockaddr.base.nm_so, msg->sockaddr.nm_nam);
 755         lwkt_replymsg(&msg->sockaddr.base.lmsg, error);
 756 }
 757
 758 int
 759 in6_setsockaddr(struct socket *so, struct sockaddr **nam)
 760 {
 761         struct inpcb *inp;
 762         struct sockaddr_in6 *sin6;
 763
 764         /*
 765          * Do the malloc first in case it blocks.
 766          */
 767         sin6 = kmalloc(sizeof *sin6, M_SONAME, M_WAITOK | M_ZERO);
 768         sin6->sin6_family = AF_INET6;
 769         sin6->sin6_len = sizeof(*sin6);
 770
 771         crit_enter();
 772         inp = so->so_pcb;
 773         if (!inp) {
 774                 crit_exit();
 775                 kfree(sin6, M_SONAME);
 776                 return EINVAL;
 777         }
 778         sin6->sin6_port = inp->inp_lport;
 779         sin6->sin6_addr = inp->in6p_laddr;
 780         crit_exit();
 781         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 782                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 783         else
 784                 sin6->sin6_scope_id = 0;        /*XXX*/
 785         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 786                 sin6->sin6_addr.s6_addr16[1] = 0;
 787
 788         *nam = (struct sockaddr *)sin6;
 789         return 0;
 790 }
 791
 792 void
 793 in6_setpeeraddr_dispatch(netmsg_t msg)
 794 {
 795         int error;
 796
 797         error = in6_setpeeraddr(msg->peeraddr.base.nm_so, msg->peeraddr.nm_nam);
 798         lwkt_replymsg(&msg->peeraddr.base.lmsg, error);
 799 }
 800
 801 int
 802 in6_setpeeraddr(struct socket *so, struct sockaddr **nam)
 803 {
 804         struct inpcb *inp;
 805         struct sockaddr_in6 *sin6;
 806
 807         /*
 808          * Do the malloc first in case it blocks.
 809          */
 810         sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
 811         sin6->sin6_family = AF_INET6;
 812         sin6->sin6_len = sizeof(struct sockaddr_in6);
 813
 814         crit_enter();
 815         inp = so->so_pcb;
 816         if (!inp) {
 817                 crit_exit();
 818                 kfree(sin6, M_SONAME);
 819                 return EINVAL;
 820         }
 821         sin6->sin6_port = inp->inp_fport;
 822         sin6->sin6_addr = inp->in6p_faddr;
 823         crit_exit();
 824         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 825                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 826         else
 827                 sin6->sin6_scope_id = 0;        /*XXX*/
 828         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 829                 sin6->sin6_addr.s6_addr16[1] = 0;
 830
 831         *nam = (struct sockaddr *)sin6;
 832         return 0;
 833 }
 834
 835 void
 836 in6_mapped_sockaddr_dispatch(netmsg_t msg)
 837 {
 838         int error;
 839
 840         error = in6_mapped_sockaddr(msg->sockaddr.base.nm_so,
 841                                     msg->sockaddr.nm_nam);
 842         lwkt_replymsg(&msg->sockaddr.base.lmsg, error);
 843 }
 844
 845 int
 846 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 847 {
 848         struct  inpcb *inp = so->so_pcb;
 849         int     error;
 850
 851         if (inp == NULL)
 852                 return EINVAL;
 853         if (inp->inp_vflag & INP_IPV4) {
 854                 error = in_setsockaddr(so, nam);
 855                 if (error == 0)
 856                         in6_sin_2_v4mapsin6_in_sock(nam);
 857         } else
 858         /* scope issues will be handled in in6_setsockaddr(). */
 859         error = in6_setsockaddr(so, nam);
 860
 861         return error;
 862 }
 863
 864 int
 865 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 866 {
 867         struct  inpcb *inp = so->so_pcb;
 868         int     error;
 869
 870         if (inp == NULL)
 871                 return EINVAL;
 872         if (inp->inp_vflag & INP_IPV4) {
 873                 error = in_setpeeraddr(so, nam);
 874                 if (error == 0)
 875                         in6_sin_2_v4mapsin6_in_sock(nam);
 876         } else
 877         /* scope issues will be handled in in6_setpeeraddr(). */
 878         error = in6_setpeeraddr(so, nam);
 879
 880         return error;
 881 }
 882
 883 void
 884 in6_mapped_peeraddr_dispatch(netmsg_t msg)
 885 {
 886         int error;
 887
 888         error = in6_mapped_peeraddr(msg->base.nm_so, msg->peeraddr.nm_nam);
 889         lwkt_replymsg(&msg->base.lmsg, error);
 890 }
 891
 892 /*
 893  * Pass some notification to all connections of a protocol
 894  * associated with address dst.  The local address and/or port numbers
 895  * may be specified to limit the search.  The "usual action" will be
 896  * taken, depending on the ctlinput cmd.  The caller must filter any
 897  * cmds that are uninteresting (e.g., no error in the map).
 898  * Call the protocol specific routine (if any) to report
 899  * any errors for each matching socket.
 900  *
 901  * Must be called under crit_enter().
 902  */
 903 void
 904 in6_pcbnotify(struct inpcbhead *head, struct sockaddr *dst, in_port_t fport,
 905               const struct sockaddr *src, in_port_t lport, int cmd, int arg,
 906               void (*notify) (struct inpcb *, int))
 907 {
 908         struct inpcb *inp, *ninp;
 909         struct sockaddr_in6 sa6_src, *sa6_dst;
 910         u_int32_t flowinfo;
 911
 912         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 913                 return;
 914
 915         sa6_dst = (struct sockaddr_in6 *)dst;
 916         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 917                 return;
 918
 919         /*
 920          * note that src can be NULL when we get notify by local fragmentation.
 921          */
 922         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 923         flowinfo = sa6_src.sin6_flowinfo;
 924
 925         /*
 926          * Redirects go to all references to the destination,
 927          * and use in6_rtchange to invalidate the route cache.
 928          * Dead host indications: also use in6_rtchange to invalidate
 929          * the cache, and deliver the error to all the sockets.
 930          * Otherwise, if we have knowledge of the local port and address,
 931          * deliver only to that socket.
 932          */
 933         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 934                 fport = 0;
 935                 lport = 0;
 936                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 937
 938                 if (cmd != PRC_HOSTDEAD)
 939                         notify = in6_rtchange;
 940         }
 941         if (cmd != PRC_MSGSIZE)
 942                 arg = inet6ctlerrmap[cmd];
 943         crit_enter();
 944         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 945                 ninp = LIST_NEXT(inp, inp_list);
 946
 947                 if (inp->inp_flags & INP_PLACEMARKER)
 948                         continue;
 949
 950                 if ((inp->inp_vflag & INP_IPV6) == 0)
 951                         continue;
 952                 /*
 953                  * If the error designates a new path MTU for a destination
 954                  * and the application (associated with this socket) wanted to
 955                  * know the value, notify. Note that we notify for all
 956                  * disconnected sockets if the corresponding application
 957                  * wanted. This is because some UDP applications keep sending
 958                  * sockets disconnected.
 959                  * XXX: should we avoid to notify the value to TCP sockets?
 960                  */
 961                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
 962                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 963                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
 964                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, &arg);
 965                 }
 966
 967                 /*
 968                  * Detect if we should notify the error. If no source and
 969                  * destination ports are specifed, but non-zero flowinfo and
 970                  * local address match, notify the error. This is the case
 971                  * when the error is delivered with an encrypted buffer
 972                  * by ESP. Otherwise, just compare addresses and ports
 973                  * as usual.
 974                  */
 975                 if (lport == 0 && fport == 0 && flowinfo &&
 976                     inp->inp_socket != NULL &&
 977                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
 978                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 979                         goto do_notify;
 980                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 981                                              &sa6_dst->sin6_addr) ||
 982                          inp->inp_socket == 0 ||
 983                          (lport && inp->inp_lport != lport) ||
 984                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 985                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 986                                               &sa6_src.sin6_addr)) ||
 987                          (fport && inp->inp_fport != fport))
 988                         continue;
 989
 990 do_notify:
 991                 if (notify)
 992                         (*notify)(inp, arg);
 993         }
 994         crit_exit();
 995 }
 996
 997 /*
 998  * Lookup a PCB based on the local address and port.
 999  */
1000 struct inpcb *
1001 in6_pcblookup_local(struct inpcbinfo *pcbinfo, const struct in6_addr *laddr,
1002                     u_int lport_arg, int wild_okay, struct ucred *cred)
1003 {
1004         struct inpcb *inp;
1005         int matchwild = 3, wildcard;
1006         u_short lport = lport_arg;
1007         struct inpcbporthead *porthash;
1008         struct inpcbport *phd;
1009         struct inpcb *match = NULL;
1010
1011         /*
1012          * If the porthashbase is shared across several cpus, it must
1013          * have been locked.
1014          */
1015         if (pcbinfo->porttoken)
1016                 ASSERT_LWKT_TOKEN_HELD(pcbinfo->porttoken);
1017
1018         /*
1019          * Best fit PCB lookup.
1020          *
1021          * First see if this local port is in use by looking on the
1022          * port hash list.
1023          */
1024         porthash = &pcbinfo->porthashbase[
1025                                 INP_PCBPORTHASH(lport, pcbinfo->porthashmask)];
1026         LIST_FOREACH(phd, porthash, phd_hash) {
1027                 if (phd->phd_port == lport)
1028                         break;
1029         }
1030
1031         if (phd != NULL) {
1032                 /*
1033                  * Port is in use by one or more PCBs. Look for best
1034                  * fit.
1035                  */
1036                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
1037                         wildcard = 0;
1038                         if ((inp->inp_vflag & INP_IPV6) == 0)
1039                                 continue;
1040                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
1041                                 wildcard++;
1042                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1043                                 if (IN6_IS_ADDR_UNSPECIFIED(laddr))
1044                                         wildcard++;
1045                                 else if (!IN6_ARE_ADDR_EQUAL(
1046                                         &inp->in6p_laddr, laddr))
1047                                         continue;
1048                         } else {
1049                                 if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
1050                                         wildcard++;
1051                         }
1052                         if (wildcard && !wild_okay)
1053                                 continue;
1054                         if (wildcard < matchwild &&
1055                             (cred == NULL ||
1056                              cred->cr_prison ==
1057                                         inp->inp_socket->so_cred->cr_prison)) {
1058                                 match = inp;
1059                                 matchwild = wildcard;
1060                                 if (wildcard == 0)
1061                                         break;
1062                                 else
1063                                         matchwild = wildcard;
1064                         }
1065                 }
1066         }
1067         return (match);
1068 }
1069
1070 void
1071 in6_pcbpurgeif0(struct in6pcb *head, struct ifnet *ifp)
1072 {
1073         struct in6pcb *in6p;
1074         struct ip6_moptions *im6o;
1075         struct in6_multi_mship *imm, *nimm;
1076
1077         for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
1078                 if (in6p->in6p_flags & INP_PLACEMARKER)
1079                         continue;
1080                 im6o = in6p->in6p_moptions;
1081                 if ((in6p->inp_vflag & INP_IPV6) &&
1082                     im6o) {
1083                         /*
1084                          * Unselect the outgoing interface if it is being
1085                          * detached.
1086                          */
1087                         if (im6o->im6o_multicast_ifp == ifp)
1088                                 im6o->im6o_multicast_ifp = NULL;
1089
1090                         /*
1091                          * Drop multicast group membership if we joined
1092                          * through the interface being detached.
1093                          * XXX controversial - is it really legal for kernel
1094                          * to force this?
1095                          */
1096                         for (imm = im6o->im6o_memberships.lh_first;
1097                              imm != NULL; imm = nimm) {
1098                                 nimm = imm->i6mm_chain.le_next;
1099                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
1100                                         LIST_REMOVE(imm, i6mm_chain);
1101                                         in6_delmulti(imm->i6mm_maddr);
1102                                         kfree(imm, M_IPMADDR);
1103                                 }
1104                         }
1105                 }
1106         }
1107 }
1108
1109 /*
1110  * Check for alternatives when higher level complains
1111  * about service problems.  For now, invalidate cached
1112  * routing information.  If the route was created dynamically
1113  * (by a redirect), time to try a default gateway again.
1114  */
1115 void
1116 in6_losing(struct inpcb *in6p)
1117 {
1118         struct rtentry *rt;
1119         struct rt_addrinfo info;
1120
1121         if ((rt = in6p->in6p_route.ro_rt) != NULL) {
1122                 bzero((caddr_t)&info, sizeof(info));
1123                 info.rti_flags = rt->rt_flags;
1124                 info.rti_info[RTAX_DST] = rt_key(rt);
1125                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1126                 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1127                 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
1128                 if (rt->rt_flags & RTF_DYNAMIC) {
1129                         rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1130                             rt_mask(rt), rt->rt_flags, NULL);
1131                 }
1132                 in6p->in6p_route.ro_rt = NULL;
1133                 rtfree(rt);
1134                 /*
1135                  * A new route can be allocated
1136                  * the next time output is attempted.
1137                  */
1138         }
1139 }
1140
1141 /*
1142  * After a routing change, flush old routing
1143  * and allocate a (hopefully) better one.
1144  */
1145 void
1146 in6_rtchange(struct inpcb *inp, int error)
1147 {
1148         if (inp->in6p_route.ro_rt) {
1149                 rtfree(inp->in6p_route.ro_rt);
1150                 inp->in6p_route.ro_rt = 0;
1151                 /*
1152                  * A new route can be allocated the next time
1153                  * output is attempted.
1154                  */
1155         }
1156 }
1157
1158 /*
1159  * Lookup PCB in hash list.
1160  */
1161 struct inpcb *
1162 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1163                    u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
1164                    int wildcard, struct ifnet *ifp)
1165 {
1166         struct inpcbhead *head;
1167         struct inpcb *inp;
1168         struct inpcb *jinp = NULL;
1169         u_short fport = fport_arg, lport = lport_arg;
1170         int faith;
1171
1172         if (faithprefix_p != NULL)
1173                 faith = (*faithprefix_p)(laddr);
1174         else
1175                 faith = 0;
1176
1177         /*
1178          * First look for an exact match.
1179          */
1180         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr->s6_addr32[3] /* XXX */,
1181                                               fport,
1182                                               laddr->s6_addr32[3], /* XXX JH */
1183                                               lport,
1184                                               pcbinfo->hashmask)];
1185         LIST_FOREACH(inp, head, inp_hash) {
1186                 if ((inp->inp_vflag & INP_IPV6) == 0)
1187                         continue;
1188                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1189                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1190                     inp->inp_fport == fport &&
1191                     inp->inp_lport == lport) {
1192                         /*
1193                          * Found.
1194                          */
1195                         if (inp->inp_socket == NULL ||
1196                         inp->inp_socket->so_cred->cr_prison == NULL) {
1197                                 return (inp);
1198                         } else {
1199                                 if  (jinp == NULL)
1200                                         jinp = inp;
1201                         }
1202                 }
1203         }
1204         if (jinp != NULL)
1205                 return(jinp);
1206         if (wildcard) {
1207                 struct inpcontainerhead *chead;
1208                 struct inpcontainer *ic;
1209                 struct inpcb *local_wild = NULL;
1210                 struct inpcb *jinp_wild = NULL;
1211                 struct sockaddr_in6 jsin6;
1212                 struct ucred *cred;
1213
1214                 /*
1215                  * Order of socket selection:
1216                  * 1. non-jailed, non-wild.
1217                  * 2. non-jailed, wild.
1218                  * 3. jailed, non-wild.
1219                  * 4. jailed, wild.
1220                  */
1221                 jsin6.sin6_family = AF_INET6;
1222                 chead = &pcbinfo->wildcardhashbase[INP_PCBWILDCARDHASH(lport,
1223                     pcbinfo->wildcardhashmask)];
1224                 LIST_FOREACH(ic, chead, ic_list) {
1225                         inp = ic->ic_inp;
1226
1227                         if (!(inp->inp_vflag & INP_IPV6))
1228                                 continue;
1229                         if (inp->inp_socket != NULL)
1230                                 cred = inp->inp_socket->so_cred;
1231                         else
1232                                 cred = NULL;
1233
1234                         if (cred != NULL && jailed(cred)) {
1235                                 if (jinp != NULL) {
1236                                         continue;
1237                                 } else {
1238                                         jsin6.sin6_addr = *laddr;
1239                                         if (!jailed_ip(cred->cr_prison,
1240                                             (struct sockaddr *)&jsin6))
1241                                                 continue;
1242                                 }
1243                         }
1244                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1245                             inp->inp_lport == lport) {
1246                                 if (faith && (inp->inp_flags & INP_FAITH) == 0)
1247                                         continue;
1248                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
1249                                                        laddr)) {
1250                                         if (cred != NULL && jailed(cred))
1251                                                 jinp = inp;
1252                                         else
1253                                                 return (inp);
1254                                 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1255                                         if (cred != NULL && jailed(cred))
1256                                                 jinp_wild = inp;
1257                                         else
1258                                                 local_wild = inp;
1259                                 }
1260                         }
1261                 }
1262                 if (local_wild != NULL)
1263                         return (local_wild);
1264                 if (jinp != NULL)
1265                         return (jinp);
1266                 return (jinp_wild);
1267         }
1268
1269         /*
1270          * Not found.
1271          */
1272         return (NULL);
1273 }
1274
1275 void
1276 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
1277 {
1278         struct ip6_hdr *ip;
1279
1280         ip = mtod(m, struct ip6_hdr *);
1281         bzero(sin6, sizeof(*sin6));
1282         sin6->sin6_len = sizeof(*sin6);
1283         sin6->sin6_family = AF_INET6;
1284         sin6->sin6_addr = ip->ip6_src;
1285         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1286                 sin6->sin6_addr.s6_addr16[1] = 0;
1287         sin6->sin6_scope_id =
1288                 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1289                 ? m->m_pkthdr.rcvif->if_index : 0;
1290
1291         return;
1292 }
1293
1294 static void
1295 in6_savefaddr(struct socket *so, const struct sockaddr *faddr)
1296 {
1297         struct sockaddr_in6 *sin6;
1298
1299         KASSERT(faddr->sa_family == AF_INET6,
1300             ("not AF_INET6 faddr %d", faddr->sa_family));
1301
1302         sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
1303         sin6->sin6_family = AF_INET6;
1304         sin6->sin6_len = sizeof(*sin6);
1305
1306         sin6->sin6_port = ((const struct sockaddr_in6 *)faddr)->sin6_port;
1307         sin6->sin6_addr = ((const struct sockaddr_in6 *)faddr)->sin6_addr;
1308
1309         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1310                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
1311         else
1312                 sin6->sin6_scope_id = 0;        /*XXX*/
1313         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1314                 sin6->sin6_addr.s6_addr16[1] = 0;
1315
1316         so->so_faddr = (struct sockaddr *)sin6;
1317 }
1318
1319 void
1320 in6_mapped_savefaddr(struct socket *so, const struct sockaddr *faddr)
1321 {
1322         if (faddr->sa_family == AF_INET) {
1323                 in_savefaddr(so, faddr);
1324                 in6_sin_2_v4mapsin6_in_sock(&so->so_faddr);
1325         } else {
1326                 in6_savefaddr(so, faddr);
1327         }
1328 }