The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_pcb.c

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    1 /*      $FreeBSD$       */
    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  * 4. 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 #include "opt_mac.h"
   69 
   70 #include <sys/param.h>
   71 #include <sys/systm.h>
   72 #include <sys/malloc.h>
   73 #include <sys/mbuf.h>
   74 #include <sys/domain.h>
   75 #include <sys/protosw.h>
   76 #include <sys/socket.h>
   77 #include <sys/socketvar.h>
   78 #include <sys/sockio.h>
   79 #include <sys/errno.h>
   80 #include <sys/time.h>
   81 #include <sys/priv.h>
   82 #include <sys/proc.h>
   83 #include <sys/jail.h>
   84 
   85 #include <vm/uma.h>
   86 
   87 #include <net/if.h>
   88 #include <net/if_types.h>
   89 #include <net/route.h>
   90 
   91 #include <netinet/in.h>
   92 #include <netinet/in_var.h>
   93 #include <netinet/in_systm.h>
   94 #include <netinet/tcp_var.h>
   95 #include <netinet/ip6.h>
   96 #include <netinet/ip_var.h>
   97 #include <netinet6/ip6_var.h>
   98 #include <netinet6/nd6.h>
   99 #include <netinet/in_pcb.h>
  100 #include <netinet6/in6_pcb.h>
  101 #include <netinet6/scope6_var.h>
  102 
  103 #ifdef IPSEC
  104 #include <netipsec/ipsec.h>
  105 #include <netipsec/ipsec6.h>
  106 #include <netipsec/key.h>
  107 #endif /* IPSEC */
  108 
  109 #include <security/mac/mac_framework.h>
  110 
  111 struct  in6_addr zeroin6_addr;
  112 
  113 int
  114 in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam,
  115     struct ucred *cred)
  116 {
  117         struct socket *so = inp->inp_socket;
  118         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
  119         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
  120         u_short lport = 0;
  121         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
  122 
  123         INP_INFO_WLOCK_ASSERT(pcbinfo);
  124         INP_LOCK_ASSERT(inp);
  125 
  126         if (!in6_ifaddr) /* XXX broken! */
  127                 return (EADDRNOTAVAIL);
  128         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
  129                 return (EINVAL);
  130         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
  131                 wild = INPLOOKUP_WILDCARD;
  132         if (nam) {
  133                 int error;
  134 
  135                 sin6 = (struct sockaddr_in6 *)nam;
  136                 if (nam->sa_len != sizeof(*sin6))
  137                         return (EINVAL);
  138                 /*
  139                  * family check.
  140                  */
  141                 if (nam->sa_family != AF_INET6)
  142                         return (EAFNOSUPPORT);
  143 
  144                 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
  145                         return(error);
  146 
  147                 lport = sin6->sin6_port;
  148                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
  149                         /*
  150                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
  151                          * allow compepte duplication of binding if
  152                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
  153                          * and a multicast address is bound on both
  154                          * new and duplicated sockets.
  155                          */
  156                         if (so->so_options & SO_REUSEADDR)
  157                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
  158                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
  159                         struct ifaddr *ia = NULL;
  160 
  161                         sin6->sin6_port = 0;            /* yech... */
  162                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
  163                                 return (EADDRNOTAVAIL);
  164 
  165                         /*
  166                          * XXX: bind to an anycast address might accidentally
  167                          * cause sending a packet with anycast source address.
  168                          * We should allow to bind to a deprecated address, since
  169                          * the application dares to use it.
  170                          */
  171                         if (ia &&
  172                             ((struct in6_ifaddr *)ia)->ia6_flags &
  173                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
  174                                 return (EADDRNOTAVAIL);
  175                         }
  176                 }
  177                 if (lport) {
  178                         struct inpcb *t;
  179 
  180                         /* GROSS */
  181                         if (ntohs(lport) <= ipport_reservedhigh &&
  182                             ntohs(lport) >= ipport_reservedlow &&
  183                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
  184                             0))
  185                                 return (EACCES);
  186                         if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
  187                             priv_check_cred(so->so_cred,
  188                             PRIV_NETINET_REUSEPORT, 0) != 0) {
  189                                 t = in6_pcblookup_local(pcbinfo,
  190                                     &sin6->sin6_addr, lport,
  191                                     INPLOOKUP_WILDCARD);
  192                                 if (t &&
  193                                     ((t->inp_vflag & INP_TIMEWAIT) == 0) &&
  194                                     (so->so_type != SOCK_STREAM ||
  195                                      IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
  196                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
  197                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
  198                                      (t->inp_socket->so_options & SO_REUSEPORT)
  199                                       == 0) && (so->so_cred->cr_uid !=
  200                                      t->inp_socket->so_cred->cr_uid))
  201                                         return (EADDRINUSE);
  202                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
  203                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
  204                                         struct sockaddr_in sin;
  205 
  206                                         in6_sin6_2_sin(&sin, sin6);
  207                                         t = in_pcblookup_local(pcbinfo,
  208                                                 sin.sin_addr, lport,
  209                                                 INPLOOKUP_WILDCARD);
  210                                         if (t &&
  211                                             ((t->inp_vflag &
  212                                               INP_TIMEWAIT) == 0) &&
  213                                             (so->so_type != SOCK_STREAM ||
  214                                              ntohl(t->inp_faddr.s_addr) ==
  215                                               INADDR_ANY) &&
  216                                             (so->so_cred->cr_uid !=
  217                                              t->inp_socket->so_cred->cr_uid))
  218                                                 return (EADDRINUSE);
  219                                 }
  220                         }
  221                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
  222                                                 lport, wild);
  223                         if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ?
  224                             intotw(t)->tw_so_options :
  225                             t->inp_socket->so_options)) == 0)
  226                                 return (EADDRINUSE);
  227                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
  228                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
  229                                 struct sockaddr_in sin;
  230 
  231                                 in6_sin6_2_sin(&sin, sin6);
  232                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
  233                                                        lport, wild);
  234                                 if (t && t->inp_vflag & INP_TIMEWAIT) {
  235                                         if ((reuseport &
  236                                             intotw(t)->tw_so_options) == 0 &&
  237                                             (ntohl(t->inp_laddr.s_addr) !=
  238                                              INADDR_ANY || ((inp->inp_vflag &
  239                                              INP_IPV6PROTO) ==
  240                                              (t->inp_vflag & INP_IPV6PROTO))))
  241                                                 return (EADDRINUSE);
  242                                 }
  243                                 else if (t &&
  244                                     (reuseport & t->inp_socket->so_options)
  245                                     == 0 && (ntohl(t->inp_laddr.s_addr) !=
  246                                     INADDR_ANY || INP_SOCKAF(so) ==
  247                                      INP_SOCKAF(t->inp_socket)))
  248                                         return (EADDRINUSE);
  249                         }
  250                 }
  251                 inp->in6p_laddr = sin6->sin6_addr;
  252         }
  253         if (lport == 0) {
  254                 int e;
  255                 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0)
  256                         return (e);
  257         }
  258         else {
  259                 inp->inp_lport = lport;
  260                 if (in_pcbinshash(inp) != 0) {
  261                         inp->in6p_laddr = in6addr_any;
  262                         inp->inp_lport = 0;
  263                         return (EAGAIN);
  264                 }
  265         }
  266         return (0);
  267 }
  268 
  269 /*
  270  *   Transform old in6_pcbconnect() into an inner subroutine for new
  271  *   in6_pcbconnect(): Do some validity-checking on the remote
  272  *   address (in mbuf 'nam') and then determine local host address
  273  *   (i.e., which interface) to use to access that remote host.
  274  *
  275  *   This preserves definition of in6_pcbconnect(), while supporting a
  276  *   slightly different version for T/TCP.  (This is more than
  277  *   a bit of a kludge, but cleaning up the internal interfaces would
  278  *   have forced minor changes in every protocol).
  279  */
  280 int
  281 in6_pcbladdr(register struct inpcb *inp, struct sockaddr *nam,
  282     struct in6_addr **plocal_addr6)
  283 {
  284         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
  285         int error = 0;
  286         struct ifnet *ifp = NULL;
  287         int scope_ambiguous = 0;
  288 
  289         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
  290         INP_LOCK_ASSERT(inp);
  291 
  292         if (nam->sa_len != sizeof (*sin6))
  293                 return (EINVAL);
  294         if (sin6->sin6_family != AF_INET6)
  295                 return (EAFNOSUPPORT);
  296         if (sin6->sin6_port == 0)
  297                 return (EADDRNOTAVAIL);
  298 
  299         if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
  300                 scope_ambiguous = 1;
  301         if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
  302                 return(error);
  303 
  304         if (in6_ifaddr) {
  305                 /*
  306                  * If the destination address is UNSPECIFIED addr,
  307                  * use the loopback addr, e.g ::1.
  308                  */
  309                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
  310                         sin6->sin6_addr = in6addr_loopback;
  311         }
  312 
  313         /*
  314          * XXX: in6_selectsrc might replace the bound local address
  315          * with the address specified by setsockopt(IPV6_PKTINFO).
  316          * Is it the intended behavior?
  317          */
  318         *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
  319                                       inp->in6p_moptions, NULL,
  320                                       &inp->in6p_laddr, &ifp, &error);
  321         if (ifp && scope_ambiguous &&
  322             (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
  323                 return(error);
  324         }
  325 
  326         if (*plocal_addr6 == 0) {
  327                 if (error == 0)
  328                         error = EADDRNOTAVAIL;
  329                 return (error);
  330         }
  331         /*
  332          * Don't do pcblookup call here; return interface in
  333          * plocal_addr6
  334          * and exit to caller, that will do the lookup.
  335          */
  336 
  337         return (0);
  338 }
  339 
  340 /*
  341  * Outer subroutine:
  342  * Connect from a socket to a specified address.
  343  * Both address and port must be specified in argument sin.
  344  * If don't have a local address for this socket yet,
  345  * then pick one.
  346  */
  347 int
  348 in6_pcbconnect(register struct inpcb *inp, struct sockaddr *nam,
  349     struct ucred *cred)
  350 {
  351         struct in6_addr *addr6;
  352         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
  353         int error;
  354 
  355         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
  356         INP_LOCK_ASSERT(inp);
  357 
  358         /*
  359          * Call inner routine, to assign local interface address.
  360          * in6_pcbladdr() may automatically fill in sin6_scope_id.
  361          */
  362         if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
  363                 return (error);
  364 
  365         if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
  366                                sin6->sin6_port,
  367                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
  368                               ? addr6 : &inp->in6p_laddr,
  369                               inp->inp_lport, 0, NULL) != NULL) {
  370                 return (EADDRINUSE);
  371         }
  372         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
  373                 if (inp->inp_lport == 0) {
  374                         error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
  375                         if (error)
  376                                 return (error);
  377                 }
  378                 inp->in6p_laddr = *addr6;
  379         }
  380         inp->in6p_faddr = sin6->sin6_addr;
  381         inp->inp_fport = sin6->sin6_port;
  382         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
  383         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
  384         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
  385                 inp->in6p_flowinfo |=
  386                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
  387 
  388         in_pcbrehash(inp);
  389 
  390         return (0);
  391 }
  392 
  393 void
  394 in6_pcbdisconnect(struct inpcb *inp)
  395 {
  396 
  397         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
  398         INP_LOCK_ASSERT(inp);
  399 
  400         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
  401         inp->inp_fport = 0;
  402         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
  403         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
  404         in_pcbrehash(inp);
  405 }
  406 
  407 void
  408 in6_pcbdetach(struct inpcb *inp)
  409 {
  410 
  411         KASSERT(inp->inp_socket != NULL, ("in6_pcbdetach: inp_socket == NULL"));
  412         inp->inp_socket->so_pcb = NULL;
  413         inp->inp_socket = NULL;
  414 }
  415 
  416 void
  417 in6_pcbfree(struct inpcb *inp)
  418 {
  419         struct inpcbinfo *ipi = inp->inp_pcbinfo;
  420 
  421         KASSERT(inp->inp_socket == NULL, ("in6_pcbfree: inp_socket != NULL"));
  422         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
  423         INP_LOCK_ASSERT(inp);
  424 
  425 #ifdef IPSEC
  426         if (inp->in6p_sp != NULL)
  427                 ipsec6_delete_pcbpolicy(inp);
  428 #endif /* IPSEC */
  429         inp->inp_gencnt = ++ipi->ipi_gencnt;
  430         in_pcbremlists(inp);
  431         ip6_freepcbopts(inp->in6p_outputopts);
  432         ip6_freemoptions(inp->in6p_moptions);
  433         /* Check and free IPv4 related resources in case of mapped addr */
  434         if (inp->inp_options)
  435                 (void)m_free(inp->inp_options);
  436         if (inp->inp_moptions != NULL)
  437                 inp_freemoptions(inp->inp_moptions);
  438         inp->inp_vflag = 0;
  439 #ifdef MAC
  440         mac_destroy_inpcb(inp);
  441 #endif
  442         INP_UNLOCK(inp);
  443         uma_zfree(ipi->ipi_zone, inp);
  444 }
  445 
  446 struct sockaddr *
  447 in6_sockaddr(in_port_t port, struct in6_addr *addr_p)
  448 {
  449         struct sockaddr_in6 *sin6;
  450 
  451         MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK);
  452         bzero(sin6, sizeof *sin6);
  453         sin6->sin6_family = AF_INET6;
  454         sin6->sin6_len = sizeof(*sin6);
  455         sin6->sin6_port = port;
  456         sin6->sin6_addr = *addr_p;
  457         (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
  458 
  459         return (struct sockaddr *)sin6;
  460 }
  461 
  462 struct sockaddr *
  463 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p)
  464 {
  465         struct sockaddr_in sin;
  466         struct sockaddr_in6 *sin6_p;
  467 
  468         bzero(&sin, sizeof sin);
  469         sin.sin_family = AF_INET;
  470         sin.sin_len = sizeof(sin);
  471         sin.sin_port = port;
  472         sin.sin_addr = *addr_p;
  473 
  474         MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
  475                 M_WAITOK);
  476         in6_sin_2_v4mapsin6(&sin, sin6_p);
  477 
  478         return (struct sockaddr *)sin6_p;
  479 }
  480 
  481 int
  482 in6_getsockaddr(struct socket *so, struct sockaddr **nam)
  483 {
  484         register struct inpcb *inp;
  485         struct in6_addr addr;
  486         in_port_t port;
  487 
  488         inp = sotoinpcb(so);
  489         KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL"));
  490 
  491         INP_LOCK(inp);
  492         port = inp->inp_lport;
  493         addr = inp->in6p_laddr;
  494         INP_UNLOCK(inp);
  495 
  496         *nam = in6_sockaddr(port, &addr);
  497         return 0;
  498 }
  499 
  500 int
  501 in6_getpeeraddr(struct socket *so, struct sockaddr **nam)
  502 {
  503         struct inpcb *inp;
  504         struct in6_addr addr;
  505         in_port_t port;
  506 
  507         inp = sotoinpcb(so);
  508         KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
  509 
  510         INP_LOCK(inp);
  511         port = inp->inp_fport;
  512         addr = inp->in6p_faddr;
  513         INP_UNLOCK(inp);
  514 
  515         *nam = in6_sockaddr(port, &addr);
  516         return 0;
  517 }
  518 
  519 int
  520 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
  521 {
  522         struct  inpcb *inp;
  523         int     error;
  524 
  525         inp = sotoinpcb(so);
  526         KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
  527 
  528         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
  529                 error = in_getsockaddr(so, nam);
  530                 if (error == 0)
  531                         in6_sin_2_v4mapsin6_in_sock(nam);
  532         } else {
  533                 /* scope issues will be handled in in6_getsockaddr(). */
  534                 error = in6_getsockaddr(so, nam);
  535         }
  536 
  537         return error;
  538 }
  539 
  540 int
  541 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
  542 {
  543         struct  inpcb *inp;
  544         int     error;
  545 
  546         inp = sotoinpcb(so);
  547         KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
  548 
  549         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
  550                 error = in_getpeeraddr(so, nam);
  551                 if (error == 0)
  552                         in6_sin_2_v4mapsin6_in_sock(nam);
  553         } else
  554         /* scope issues will be handled in in6_getpeeraddr(). */
  555         error = in6_getpeeraddr(so, nam);
  556 
  557         return error;
  558 }
  559 
  560 /*
  561  * Pass some notification to all connections of a protocol
  562  * associated with address dst.  The local address and/or port numbers
  563  * may be specified to limit the search.  The "usual action" will be
  564  * taken, depending on the ctlinput cmd.  The caller must filter any
  565  * cmds that are uninteresting (e.g., no error in the map).
  566  * Call the protocol specific routine (if any) to report
  567  * any errors for each matching socket.
  568  */
  569 void
  570 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
  571     u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
  572     int cmd, void *cmdarg,
  573     struct inpcb *(*notify) __P((struct inpcb *, int)))
  574 {
  575         struct inpcbhead *head;
  576         struct inpcb *inp, *ninp;
  577         struct sockaddr_in6 sa6_src, *sa6_dst;
  578         u_short fport = fport_arg, lport = lport_arg;
  579         u_int32_t flowinfo;
  580         int errno;
  581 
  582         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
  583                 return;
  584 
  585         sa6_dst = (struct sockaddr_in6 *)dst;
  586         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
  587                 return;
  588 
  589         /*
  590          * note that src can be NULL when we get notify by local fragmentation.
  591          */
  592         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
  593         flowinfo = sa6_src.sin6_flowinfo;
  594 
  595         /*
  596          * Redirects go to all references to the destination,
  597          * and use in6_rtchange to invalidate the route cache.
  598          * Dead host indications: also use in6_rtchange to invalidate
  599          * the cache, and deliver the error to all the sockets.
  600          * Otherwise, if we have knowledge of the local port and address,
  601          * deliver only to that socket.
  602          */
  603         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
  604                 fport = 0;
  605                 lport = 0;
  606                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
  607 
  608                 if (cmd != PRC_HOSTDEAD)
  609                         notify = in6_rtchange;
  610         }
  611         errno = inet6ctlerrmap[cmd];
  612         head = pcbinfo->ipi_listhead;
  613         INP_INFO_WLOCK(pcbinfo);
  614         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
  615                 INP_LOCK(inp);
  616                 ninp = LIST_NEXT(inp, inp_list);
  617 
  618                 if ((inp->inp_vflag & INP_IPV6) == 0) {
  619                         INP_UNLOCK(inp);
  620                         continue;
  621                 }
  622 
  623                 /*
  624                  * If the error designates a new path MTU for a destination
  625                  * and the application (associated with this socket) wanted to
  626                  * know the value, notify. Note that we notify for all
  627                  * disconnected sockets if the corresponding application
  628                  * wanted. This is because some UDP applications keep sending
  629                  * sockets disconnected.
  630                  * XXX: should we avoid to notify the value to TCP sockets?
  631                  */
  632                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
  633                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
  634                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
  635                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
  636                                         (u_int32_t *)cmdarg);
  637                 }
  638 
  639                 /*
  640                  * Detect if we should notify the error. If no source and
  641                  * destination ports are specifed, but non-zero flowinfo and
  642                  * local address match, notify the error. This is the case
  643                  * when the error is delivered with an encrypted buffer
  644                  * by ESP. Otherwise, just compare addresses and ports
  645                  * as usual.
  646                  */
  647                 if (lport == 0 && fport == 0 && flowinfo &&
  648                     inp->inp_socket != NULL &&
  649                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
  650                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
  651                         goto do_notify;
  652                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
  653                                              &sa6_dst->sin6_addr) ||
  654                          inp->inp_socket == 0 ||
  655                          (lport && inp->inp_lport != lport) ||
  656                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
  657                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
  658                                               &sa6_src.sin6_addr)) ||
  659                          (fport && inp->inp_fport != fport)) {
  660                         INP_UNLOCK(inp);
  661                         continue;
  662                 }
  663 
  664           do_notify:
  665                 if (notify) {
  666                         if ((*notify)(inp, errno))
  667                                 INP_UNLOCK(inp);
  668                 } else
  669                         INP_UNLOCK(inp);
  670         }
  671         INP_INFO_WUNLOCK(pcbinfo);
  672 }
  673 
  674 /*
  675  * Lookup a PCB based on the local address and port.
  676  */
  677 struct inpcb *
  678 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
  679     u_int lport_arg, int wild_okay)
  680 {
  681         register struct inpcb *inp;
  682         int matchwild = 3, wildcard;
  683         u_short lport = lport_arg;
  684 
  685         INP_INFO_WLOCK_ASSERT(pcbinfo);
  686 
  687         if (!wild_okay) {
  688                 struct inpcbhead *head;
  689                 /*
  690                  * Look for an unconnected (wildcard foreign addr) PCB that
  691                  * matches the local address and port we're looking for.
  692                  */
  693                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
  694                     0, pcbinfo->ipi_hashmask)];
  695                 LIST_FOREACH(inp, head, inp_hash) {
  696                         if ((inp->inp_vflag & INP_IPV6) == 0)
  697                                 continue;
  698                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
  699                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
  700                             inp->inp_lport == lport) {
  701                                 /*
  702                                  * Found.
  703                                  */
  704                                 return (inp);
  705                         }
  706                 }
  707                 /*
  708                  * Not found.
  709                  */
  710                 return (NULL);
  711         } else {
  712                 struct inpcbporthead *porthash;
  713                 struct inpcbport *phd;
  714                 struct inpcb *match = NULL;
  715                 /*
  716                  * Best fit PCB lookup.
  717                  *
  718                  * First see if this local port is in use by looking on the
  719                  * port hash list.
  720                  */
  721                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
  722                     pcbinfo->ipi_porthashmask)];
  723                 LIST_FOREACH(phd, porthash, phd_hash) {
  724                         if (phd->phd_port == lport)
  725                                 break;
  726                 }
  727                 if (phd != NULL) {
  728                         /*
  729                          * Port is in use by one or more PCBs. Look for best
  730                          * fit.
  731                          */
  732                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
  733                                 wildcard = 0;
  734                                 if ((inp->inp_vflag & INP_IPV6) == 0)
  735                                         continue;
  736                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
  737                                         wildcard++;
  738                                 if (!IN6_IS_ADDR_UNSPECIFIED(
  739                                         &inp->in6p_laddr)) {
  740                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
  741                                                 wildcard++;
  742                                         else if (!IN6_ARE_ADDR_EQUAL(
  743                                                 &inp->in6p_laddr, laddr))
  744                                                 continue;
  745                                 } else {
  746                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
  747                                                 wildcard++;
  748                                 }
  749                                 if (wildcard < matchwild) {
  750                                         match = inp;
  751                                         matchwild = wildcard;
  752                                         if (matchwild == 0) {
  753                                                 break;
  754                                         }
  755                                 }
  756                         }
  757                 }
  758                 return (match);
  759         }
  760 }
  761 
  762 void
  763 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
  764 {
  765         struct in6pcb *in6p;
  766         struct ip6_moptions *im6o;
  767         struct in6_multi_mship *imm, *nimm;
  768 
  769         INP_INFO_RLOCK(pcbinfo);
  770         LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) {
  771                 INP_LOCK(in6p);
  772                 im6o = in6p->in6p_moptions;
  773                 if ((in6p->inp_vflag & INP_IPV6) &&
  774                     im6o) {
  775                         /*
  776                          * Unselect the outgoing interface if it is being
  777                          * detached.
  778                          */
  779                         if (im6o->im6o_multicast_ifp == ifp)
  780                                 im6o->im6o_multicast_ifp = NULL;
  781 
  782                         /*
  783                          * Drop multicast group membership if we joined
  784                          * through the interface being detached.
  785                          * XXX controversial - is it really legal for kernel
  786                          * to force this?
  787                          */
  788                         for (imm = im6o->im6o_memberships.lh_first;
  789                              imm != NULL; imm = nimm) {
  790                                 nimm = imm->i6mm_chain.le_next;
  791                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
  792                                         LIST_REMOVE(imm, i6mm_chain);
  793                                         in6_delmulti(imm->i6mm_maddr);
  794                                         free(imm, M_IP6MADDR);
  795                                 }
  796                         }
  797                 }
  798                 INP_UNLOCK(in6p);
  799         }
  800         INP_INFO_RUNLOCK(pcbinfo);
  801 }
  802 
  803 /*
  804  * Check for alternatives when higher level complains
  805  * about service problems.  For now, invalidate cached
  806  * routing information.  If the route was created dynamically
  807  * (by a redirect), time to try a default gateway again.
  808  */
  809 void
  810 in6_losing(struct inpcb *in6p)
  811 {
  812 
  813         /*
  814          * We don't store route pointers in the routing table anymore
  815          */
  816         return;
  817 }
  818 
  819 /*
  820  * After a routing change, flush old routing
  821  * and allocate a (hopefully) better one.
  822  */
  823 struct inpcb *
  824 in6_rtchange(struct inpcb *inp, int errno)
  825 {
  826         /*
  827          * We don't store route pointers in the routing table anymore
  828          */
  829         return inp;
  830 }
  831 
  832 /*
  833  * Lookup PCB in hash list.
  834  */
  835 struct inpcb *
  836 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
  837     u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
  838     int wildcard, struct ifnet *ifp)
  839 {
  840         struct inpcbhead *head;
  841         register struct inpcb *inp;
  842         u_short fport = fport_arg, lport = lport_arg;
  843         int faith;
  844 
  845         INP_INFO_RLOCK_ASSERT(pcbinfo);
  846 
  847         if (faithprefix_p != NULL)
  848                 faith = (*faithprefix_p)(laddr);
  849         else
  850                 faith = 0;
  851 
  852         /*
  853          * First look for an exact match.
  854          */
  855         head = &pcbinfo->ipi_hashbase[
  856             INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport,
  857             pcbinfo->ipi_hashmask)];
  858         LIST_FOREACH(inp, head, inp_hash) {
  859                 if ((inp->inp_vflag & INP_IPV6) == 0)
  860                         continue;
  861                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
  862                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
  863                     inp->inp_fport == fport &&
  864                     inp->inp_lport == lport) {
  865                         /*
  866                          * Found.
  867                          */
  868                         return (inp);
  869                 }
  870         }
  871         if (wildcard) {
  872                 struct inpcb *local_wild = NULL;
  873 
  874                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
  875                     0, pcbinfo->ipi_hashmask)];
  876                 LIST_FOREACH(inp, head, inp_hash) {
  877                         if ((inp->inp_vflag & INP_IPV6) == 0)
  878                                 continue;
  879                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
  880                             inp->inp_lport == lport) {
  881                                 if (faith && (inp->inp_flags & INP_FAITH) == 0)
  882                                         continue;
  883                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
  884                                                        laddr))
  885                                         return (inp);
  886                                 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
  887                                         local_wild = inp;
  888                         }
  889                 }
  890                 return (local_wild);
  891         }
  892 
  893         /*
  894          * Not found.
  895          */
  896         return (NULL);
  897 }
  898 
  899 void
  900 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
  901 {
  902         struct ip6_hdr *ip;
  903 
  904         ip = mtod(m, struct ip6_hdr *);
  905         bzero(sin6, sizeof(*sin6));
  906         sin6->sin6_len = sizeof(*sin6);
  907         sin6->sin6_family = AF_INET6;
  908         sin6->sin6_addr = ip->ip6_src;
  909 
  910         (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
  911 
  912         return;
  913 }

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