The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/netinet6/in6.c

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    1 /*      $FreeBSD: src/sys/netinet6/in6.c,v 1.7.2.9 2002/04/28 05:40:26 suz Exp $        */
    2 /*      $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi 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  * Copyright (c) 1982, 1986, 1991, 1993
   35  *      The Regents of the University of California.  All rights reserved.
   36  *
   37  * Redistribution and use in source and binary forms, with or without
   38  * modification, are permitted provided that the following conditions
   39  * are met:
   40  * 1. Redistributions of source code must retain the above copyright
   41  *    notice, this list of conditions and the following disclaimer.
   42  * 2. Redistributions in binary form must reproduce the above copyright
   43  *    notice, this list of conditions and the following disclaimer in the
   44  *    documentation and/or other materials provided with the distribution.
   45  * 3. Neither the name of the University nor the names of its contributors
   46  *    may be used to endorse or promote products derived from this software
   47  *    without specific prior written permission.
   48  *
   49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   59  * SUCH DAMAGE.
   60  *
   61  *      @(#)in.c        8.2 (Berkeley) 11/15/93
   62  */
   63 
   64 #include "opt_inet.h"
   65 #include "opt_inet6.h"
   66 
   67 #include <sys/param.h>
   68 #include <sys/errno.h>
   69 #include <sys/malloc.h>
   70 #include <sys/socket.h>
   71 #include <sys/socketvar.h>
   72 #include <sys/sockio.h>
   73 #include <sys/systm.h>
   74 #include <sys/proc.h>
   75 #include <sys/priv.h>
   76 #include <sys/time.h>
   77 #include <sys/kernel.h>
   78 #include <sys/syslog.h>
   79 
   80 #include <sys/thread2.h>
   81 #include <sys/msgport2.h>
   82 
   83 #include <net/if.h>
   84 #include <net/if_types.h>
   85 #include <net/route.h>
   86 #include <net/if_dl.h>
   87 
   88 #include <netinet/in.h>
   89 #include <netinet/in_var.h>
   90 #include <netinet/if_ether.h>
   91 #include <netinet/in_systm.h>
   92 #include <netinet/ip.h>
   93 #include <netinet/in_pcb.h>
   94 
   95 #include <netinet/ip6.h>
   96 #include <netinet6/ip6_var.h>
   97 #include <netinet6/nd6.h>
   98 #include <netinet6/mld6_var.h>
   99 #include <netinet6/ip6_mroute.h>
  100 #include <netinet6/in6_ifattach.h>
  101 #include <netinet6/scope6_var.h>
  102 #include <netinet6/in6_pcb.h>
  103 #include <netinet6/in6_var.h>
  104 
  105 #include <net/net_osdep.h>
  106 
  107 /*
  108  * Definitions of some costant IP6 addresses.
  109  */
  110 const struct in6_addr kin6addr_any = IN6ADDR_ANY_INIT;
  111 const struct in6_addr kin6addr_loopback = IN6ADDR_LOOPBACK_INIT;
  112 const struct in6_addr kin6addr_nodelocal_allnodes =
  113         IN6ADDR_NODELOCAL_ALLNODES_INIT;
  114 const struct in6_addr kin6addr_linklocal_allnodes =
  115         IN6ADDR_LINKLOCAL_ALLNODES_INIT;
  116 const struct in6_addr kin6addr_linklocal_allrouters =
  117         IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
  118 
  119 const struct in6_addr in6mask0 = IN6MASK0;
  120 const struct in6_addr in6mask32 = IN6MASK32;
  121 const struct in6_addr in6mask64 = IN6MASK64;
  122 const struct in6_addr in6mask96 = IN6MASK96;
  123 const struct in6_addr in6mask128 = IN6MASK128;
  124 
  125 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6,
  126                                      0, 0, IN6ADDR_ANY_INIT, 0};
  127 
  128 static int in6_lifaddr_ioctl (struct socket *, u_long, caddr_t,
  129         struct ifnet *, struct thread *);
  130 static int in6_ifinit (struct ifnet *, struct in6_ifaddr *,
  131                            struct sockaddr_in6 *, int);
  132 static void in6_unlink_ifa (struct in6_ifaddr *, struct ifnet *);
  133 static void in6_ifloop_request_callback(int, int, struct rt_addrinfo *, struct rtentry *, void *);
  134 
  135 struct in6_multihead in6_multihead;     /* XXX BSS initialization */
  136 
  137 int     (*faithprefix_p)(struct in6_addr *);
  138 
  139 /*
  140  * Subroutine for in6_ifaddloop() and in6_ifremloop().
  141  * This routine does actual work.
  142  */
  143 static void
  144 in6_ifloop_request(int cmd, struct ifaddr *ifa)
  145 {
  146         struct sockaddr_in6 all1_sa;
  147         struct rt_addrinfo rtinfo;
  148         int error;
  149 
  150         bzero(&all1_sa, sizeof(all1_sa));
  151         all1_sa.sin6_family = AF_INET6;
  152         all1_sa.sin6_len = sizeof(struct sockaddr_in6);
  153         all1_sa.sin6_addr = in6mask128;
  154 
  155         /*
  156          * We specify the address itself as the gateway, and set the
  157          * RTF_LLINFO flag, so that the corresponding host route would have
  158          * the flag, and thus applications that assume traditional behavior
  159          * would be happy.  Note that we assume the caller of the function
  160          * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest,
  161          * which changes the outgoing interface to the loopback interface.
  162          */
  163         bzero(&rtinfo, sizeof(struct rt_addrinfo));
  164         rtinfo.rti_info[RTAX_DST] = ifa->ifa_addr;
  165         rtinfo.rti_info[RTAX_GATEWAY] = ifa->ifa_addr;
  166         rtinfo.rti_info[RTAX_NETMASK] = (struct sockaddr *)&all1_sa;
  167         rtinfo.rti_flags = RTF_UP|RTF_HOST|RTF_LLINFO;
  168 
  169         error = rtrequest1_global(cmd, &rtinfo,
  170             in6_ifloop_request_callback, ifa, RTREQ_PRIO_NORM);
  171         if (error != 0) {
  172                 log(LOG_ERR, "in6_ifloop_request: "
  173                     "%s operation failed for %s (errno=%d)\n",
  174                     cmd == RTM_ADD ? "ADD" : "DELETE",
  175                     ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr),
  176                     error);
  177         }
  178 }
  179 
  180 static void
  181 in6_ifloop_request_callback(int cmd, int error, struct rt_addrinfo *rtinfo,
  182                             struct rtentry *rt, void *arg)
  183 {
  184         struct ifaddr *ifa = arg;
  185 
  186         if (error)
  187                 goto done;
  188 
  189         /*
  190          * Make sure rt_ifa be equal to IFA, the second argument of the
  191          * function.
  192          * We need this because when we refer to rt_ifa->ia6_flags in
  193          * ip6_input, we assume that the rt_ifa points to the address instead
  194          * of the loopback address.
  195          */
  196         if (cmd == RTM_ADD && rt && ifa != rt->rt_ifa) {
  197                 ++rt->rt_refcnt;
  198                 IFAFREE(rt->rt_ifa);
  199                 IFAREF(ifa);
  200                 rt->rt_ifa = ifa;
  201                 --rt->rt_refcnt;
  202         }
  203 
  204         /*
  205          * Report the addition/removal of the address to the routing socket.
  206          * XXX: since we called rtinit for a p2p interface with a destination,
  207          *      we end up reporting twice in such a case.  Should we rather
  208          *      omit the second report?
  209          */
  210         if (rt) {
  211                 if (mycpuid == 0)
  212                         rt_newaddrmsg(cmd, ifa, error, rt);
  213                 if (cmd == RTM_DELETE) {
  214                         if (rt->rt_refcnt == 0) {
  215                                 ++rt->rt_refcnt;
  216                                 rtfree(rt);
  217                         }
  218                 }
  219         }
  220 done:
  221         /* no way to return any new error */
  222         ;
  223 }
  224 
  225 /*
  226  * Add ownaddr as loopback rtentry.  We previously add the route only if
  227  * necessary (ex. on a p2p link).  However, since we now manage addresses
  228  * separately from prefixes, we should always add the route.  We can't
  229  * rely on the cloning mechanism from the corresponding interface route
  230  * any more.
  231  */
  232 void
  233 in6_ifaddloop(struct ifaddr *ifa)
  234 {
  235         struct rtentry *rt;
  236 
  237         /* If there is no loopback entry, allocate one. */
  238         rt = rtpurelookup(ifa->ifa_addr);
  239         if (rt == NULL || !(rt->rt_flags & RTF_HOST) ||
  240             !(rt->rt_ifp->if_flags & IFF_LOOPBACK))
  241                 in6_ifloop_request(RTM_ADD, ifa);
  242         if (rt != NULL)
  243                 rt->rt_refcnt--;
  244 }
  245 
  246 /*
  247  * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(),
  248  * if it exists.
  249  */
  250 void
  251 in6_ifremloop(struct ifaddr *ifa)
  252 {
  253         struct in6_ifaddr *ia;
  254         struct rtentry *rt;
  255         int ia_count = 0;
  256 
  257         /*
  258          * Some of BSD variants do not remove cloned routes
  259          * from an interface direct route, when removing the direct route
  260          * (see comments in net/net_osdep.h).  Even for variants that do remove
  261          * cloned routes, they could fail to remove the cloned routes when
  262          * we handle multple addresses that share a common prefix.
  263          * So, we should remove the route corresponding to the deleted address
  264          * regardless of the result of in6_is_ifloop_auto().
  265          */
  266 
  267         /*
  268          * Delete the entry only if exact one ifa exists.  More than one ifa
  269          * can exist if we assign a same single address to multiple
  270          * (probably p2p) interfaces.
  271          * XXX: we should avoid such a configuration in IPv6...
  272          */
  273         for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
  274                 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) {
  275                         ia_count++;
  276                         if (ia_count > 1)
  277                                 break;
  278                 }
  279         }
  280 
  281         if (ia_count == 1) {
  282                 /*
  283                  * Before deleting, check if a corresponding loopbacked host
  284                  * route surely exists.  With this check, we can avoid to
  285                  * delete an interface direct route whose destination is same
  286                  * as the address being removed.  This can happen when remofing
  287                  * a subnet-router anycast address on an interface attahced
  288                  * to a shared medium.
  289                  */
  290                 rt = rtpurelookup(ifa->ifa_addr);
  291                 if (rt != NULL && (rt->rt_flags & RTF_HOST) &&
  292                     (rt->rt_ifp->if_flags & IFF_LOOPBACK)) {
  293                         rt->rt_refcnt--;
  294                         in6_ifloop_request(RTM_DELETE, ifa);
  295                 }
  296         }
  297 }
  298 
  299 int
  300 in6_ifindex2scopeid(int idx)
  301 {
  302         struct ifnet *ifp;
  303         struct sockaddr_in6 *sin6;
  304         struct ifaddr_container *ifac;
  305 
  306         if (idx < 0 || if_index < idx)
  307                 return -1;
  308         ifp = ifindex2ifnet[idx];
  309 
  310         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link)
  311         {
  312                 struct ifaddr *ifa = ifac->ifa;
  313 
  314                 if (ifa->ifa_addr->sa_family != AF_INET6)
  315                         continue;
  316                 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
  317                 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))
  318                         return sin6->sin6_scope_id & 0xffff;
  319         }
  320 
  321         return -1;
  322 }
  323 
  324 int
  325 in6_mask2len(struct in6_addr *mask, u_char *lim0)
  326 {
  327         int x = 0, y;
  328         u_char *lim = lim0, *p;
  329 
  330         if (lim0 == NULL ||
  331             lim0 - (u_char *)mask > sizeof(*mask)) /* ignore the scope_id part */
  332                 lim = (u_char *)mask + sizeof(*mask);
  333         for (p = (u_char *)mask; p < lim; x++, p++) {
  334                 if (*p != 0xff)
  335                         break;
  336         }
  337         y = 0;
  338         if (p < lim) {
  339                 for (y = 0; y < 8; y++) {
  340                         if ((*p & (0x80 >> y)) == 0)
  341                                 break;
  342                 }
  343         }
  344 
  345         /*
  346          * when the limit pointer is given, do a stricter check on the
  347          * remaining bits.
  348          */
  349         if (p < lim) {
  350                 if (y != 0 && (*p & (0x00ff >> y)) != 0)
  351                         return (-1);
  352                 for (p = p + 1; p < lim; p++)
  353                         if (*p != 0)
  354                                 return (-1);
  355         }
  356 
  357         return x * 8 + y;
  358 }
  359 
  360 void
  361 in6_len2mask(struct in6_addr *mask, int len)
  362 {
  363         int i;
  364 
  365         bzero(mask, sizeof(*mask));
  366         for (i = 0; i < len / 8; i++)
  367                 mask->s6_addr8[i] = 0xff;
  368         if (len % 8)
  369                 mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff;
  370 }
  371 
  372 #define ifa2ia6(ifa)    ((struct in6_ifaddr *)(ifa))
  373 #define ia62ifa(ia6)    (&((ia6)->ia_ifa))
  374 
  375 void
  376 in6_control_dispatch(netmsg_t msg)
  377 {
  378         int error;
  379 
  380         error = in6_control(msg->control.base.nm_so,
  381                             msg->control.nm_cmd,
  382                             msg->control.nm_data,
  383                             msg->control.nm_ifp,
  384                             msg->control.nm_td);
  385         lwkt_replymsg(&msg->control.base.lmsg, error);
  386 }
  387 
  388 int
  389 in6_control(struct socket *so, u_long cmd, caddr_t data,
  390             struct ifnet *ifp, struct thread *td)
  391 {
  392         struct  in6_ifreq *ifr = (struct in6_ifreq *)data;
  393         struct  in6_ifaddr *ia = NULL;
  394         struct  in6_aliasreq *ifra = (struct in6_aliasreq *)data;
  395         struct  in6_ifextra *xtra;
  396         int privileged;
  397         int error;
  398 
  399         privileged = 0;
  400         if (priv_check(td, PRIV_ROOT) == 0)
  401                 privileged++;
  402 
  403         switch (cmd) {
  404         case SIOCGETSGCNT_IN6:
  405         case SIOCGETMIFCNT_IN6:
  406                 return (mrt6_ioctl(cmd, data));
  407         }
  408 
  409         switch(cmd) {
  410         case SIOCAADDRCTL_POLICY:
  411         case SIOCDADDRCTL_POLICY:
  412                 if (!privileged)
  413                         return (EPERM);
  414                 return (in6_src_ioctl(cmd, data));
  415         }
  416 
  417         if (ifp == NULL)
  418                 return (EOPNOTSUPP);
  419 
  420         switch (cmd) {
  421         case SIOCSNDFLUSH_IN6:
  422         case SIOCSPFXFLUSH_IN6:
  423         case SIOCSRTRFLUSH_IN6:
  424         case SIOCSDEFIFACE_IN6:
  425         case SIOCSIFINFO_FLAGS:
  426                 if (!privileged)
  427                         return (EPERM);
  428                 /* fall through */
  429         case OSIOCGIFINFO_IN6:
  430         case SIOCGIFINFO_IN6:
  431         case SIOCGDRLST_IN6:
  432         case SIOCGPRLST_IN6:
  433         case SIOCGNBRINFO_IN6:
  434         case SIOCGDEFIFACE_IN6:
  435                 return (nd6_ioctl(cmd, data, ifp));
  436         }
  437 
  438         switch (cmd) {
  439         case SIOCSIFPREFIX_IN6:
  440         case SIOCDIFPREFIX_IN6:
  441         case SIOCAIFPREFIX_IN6:
  442         case SIOCCIFPREFIX_IN6:
  443         case SIOCSGIFPREFIX_IN6:
  444         case SIOCGIFPREFIX_IN6:
  445                 log(LOG_NOTICE,
  446                     "prefix ioctls are now invalidated. "
  447                     "please use ifconfig.\n");
  448                 return (EOPNOTSUPP);
  449         }
  450 
  451         switch (cmd) {
  452         case SIOCSSCOPE6:
  453                 if (!privileged)
  454                         return (EPERM);
  455                 return (scope6_set(ifp,
  456                         (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
  457                 break;
  458         case SIOCGSCOPE6:
  459                 return (scope6_get(ifp,
  460                         (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
  461                 break;
  462         case SIOCGSCOPE6DEF:
  463                 return (scope6_get_default((struct scope6_id *)
  464                         ifr->ifr_ifru.ifru_scope_id));
  465                 break;
  466         }
  467 
  468         switch (cmd) {
  469         case SIOCALIFADDR:
  470         case SIOCDLIFADDR:
  471                 if (!privileged)
  472                         return (EPERM);
  473                 /* fall through */
  474         case SIOCGLIFADDR:
  475                 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
  476         }
  477 
  478         /*
  479          * Find address for this interface, if it exists.
  480          */
  481         if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */
  482                 struct sockaddr_in6 *sa6 =
  483                         (struct sockaddr_in6 *)&ifra->ifra_addr;
  484 
  485                 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) {
  486                         if (sa6->sin6_addr.s6_addr16[1] == 0) {
  487                                 /* link ID is not embedded by the user */
  488                                 sa6->sin6_addr.s6_addr16[1] =
  489                                         htons(ifp->if_index);
  490                         } else if (sa6->sin6_addr.s6_addr16[1] !=
  491                                     htons(ifp->if_index)) {
  492                                 return (EINVAL);        /* link ID contradicts */
  493                         }
  494                         if (sa6->sin6_scope_id) {
  495                                 if (sa6->sin6_scope_id !=
  496                                     (u_int32_t)ifp->if_index)
  497                                         return (EINVAL);
  498                                 sa6->sin6_scope_id = 0; /* XXX: good way? */
  499                         }
  500                 }
  501                 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr);
  502         }
  503 
  504         switch (cmd) {
  505         case SIOCSIFADDR_IN6:
  506         case SIOCSIFDSTADDR_IN6:
  507         case SIOCSIFNETMASK_IN6:
  508                 /*
  509                  * Since IPv6 allows a node to assign multiple addresses
  510                  * on a single interface, SIOCSIFxxx ioctls are not suitable
  511                  * and should be unused.
  512                  */
  513                 /* we decided to obsolete this command (20000704) */
  514                 return (EINVAL);
  515 
  516         case SIOCDIFADDR_IN6:
  517                 /*
  518                  * for IPv4, we look for existing in_ifaddr here to allow
  519                  * "ifconfig if0 delete" to remove first IPv4 address on the
  520                  * interface.  For IPv6, as the spec allow multiple interface
  521                  * address from the day one, we consider "remove the first one"
  522                  * semantics to be not preferable.
  523                  */
  524                 if (ia == NULL)
  525                         return (EADDRNOTAVAIL);
  526                 /* FALLTHROUGH */
  527         case SIOCAIFADDR_IN6:
  528                 /*
  529                  * We always require users to specify a valid IPv6 address for
  530                  * the corresponding operation.
  531                  */
  532                 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
  533                     ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6))
  534                         return (EAFNOSUPPORT);
  535                 if (!privileged)
  536                         return (EPERM);
  537 
  538                 break;
  539 
  540         case SIOCGIFADDR_IN6:
  541                 /* This interface is basically deprecated. use SIOCGIFCONF. */
  542                 /* fall through */
  543         case SIOCGIFAFLAG_IN6:
  544         case SIOCGIFNETMASK_IN6:
  545         case SIOCGIFDSTADDR_IN6:
  546         case SIOCGIFALIFETIME_IN6:
  547                 /* must think again about its semantics */
  548                 if (ia == NULL)
  549                         return (EADDRNOTAVAIL);
  550                 break;
  551         case SIOCSIFALIFETIME_IN6:
  552             {
  553                 struct in6_addrlifetime *lt;
  554 
  555                 if (!privileged)
  556                         return (EPERM);
  557                 if (ia == NULL)
  558                         return (EADDRNOTAVAIL);
  559                 /* sanity for overflow - beware unsigned */
  560                 lt = &ifr->ifr_ifru.ifru_lifetime;
  561                 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME
  562                     && lt->ia6t_vltime + time_uptime < time_uptime) {
  563                         return EINVAL;
  564                 }
  565                 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME
  566                     && lt->ia6t_pltime + time_uptime < time_uptime) {
  567                         return EINVAL;
  568                 }
  569                 break;
  570             }
  571         }
  572 
  573         switch (cmd) {
  574 
  575         case SIOCGIFADDR_IN6:
  576                 ifr->ifr_addr = ia->ia_addr;
  577                 break;
  578 
  579         case SIOCGIFDSTADDR_IN6:
  580                 if (!(ifp->if_flags & IFF_POINTOPOINT))
  581                         return (EINVAL);
  582                 /*
  583                  * XXX: should we check if ifa_dstaddr is NULL and return
  584                  * an error?
  585                  */
  586                 ifr->ifr_dstaddr = ia->ia_dstaddr;
  587                 break;
  588 
  589         case SIOCGIFNETMASK_IN6:
  590                 ifr->ifr_addr = ia->ia_prefixmask;
  591                 break;
  592 
  593         case SIOCGIFAFLAG_IN6:
  594                 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
  595                 break;
  596 
  597         case SIOCGIFSTAT_IN6:
  598                 if (ifp == NULL || (xtra = ifp->if_afdata[AF_INET6]) == NULL)
  599                         return EINVAL;
  600                 bzero(&ifr->ifr_ifru.ifru_stat,
  601                       sizeof(ifr->ifr_ifru.ifru_stat));
  602                 ifr->ifr_ifru.ifru_stat = *xtra->in6_ifstat;
  603                 break;
  604 
  605         case SIOCGIFSTAT_ICMP6:
  606                 if (ifp == NULL || (xtra = ifp->if_afdata[AF_INET6]) == NULL)
  607                         return EINVAL;
  608                 bzero(&ifr->ifr_ifru.ifru_stat,
  609                         sizeof(ifr->ifr_ifru.ifru_icmp6stat));
  610                 ifr->ifr_ifru.ifru_icmp6stat = *xtra->icmp6_ifstat;
  611                 break;
  612 
  613         case SIOCSIFADDR:
  614         case SIOCSIFDSTADDR:
  615         case SIOCSIFBRDADDR:
  616         case SIOCSIFNETMASK:
  617                 /*
  618                  * Do not pass those ioctl to driver handler since they are not
  619                  * properly setup.  Instead just error out.
  620                  */
  621                 return (EOPNOTSUPP);
  622                 
  623         case SIOCGIFALIFETIME_IN6:
  624                 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
  625                 break;
  626 
  627         case SIOCSIFALIFETIME_IN6:
  628                 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
  629                 /* for sanity */
  630                 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  631                         ia->ia6_lifetime.ia6t_expire =
  632                                 time_uptime + ia->ia6_lifetime.ia6t_vltime;
  633                 } else
  634                         ia->ia6_lifetime.ia6t_expire = 0;
  635                 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  636                         ia->ia6_lifetime.ia6t_preferred =
  637                                 time_uptime + ia->ia6_lifetime.ia6t_pltime;
  638                 } else
  639                         ia->ia6_lifetime.ia6t_preferred = 0;
  640                 break;
  641 
  642         case SIOCAIFADDR_IN6:
  643         {
  644                 int i, error = 0, iaIsNew;
  645                 struct nd_prefix pr0, *pr;
  646 
  647                 if (ia != NULL)
  648                         iaIsNew = 0;
  649                 else
  650                         iaIsNew = 1;
  651 
  652                 /*
  653                  * first, make or update the interface address structure,
  654                  * and link it to the list.
  655                  */
  656                 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0)
  657                         return (error);
  658 
  659                 /*
  660                  * then, make the prefix on-link on the interface.
  661                  * XXX: we'd rather create the prefix before the address, but
  662                  * we need at least one address to install the corresponding
  663                  * interface route, so we configure the address first.
  664                  */
  665 
  666                 /*
  667                  * convert mask to prefix length (prefixmask has already
  668                  * been validated in in6_update_ifa().
  669                  */
  670                 bzero(&pr0, sizeof(pr0));
  671                 pr0.ndpr_ifp = ifp;
  672                 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
  673                                              NULL);
  674                 if (pr0.ndpr_plen == 128)
  675                         break;  /* we don't need to install a host route. */
  676                 pr0.ndpr_prefix = ifra->ifra_addr;
  677                 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr;
  678                 /* apply the mask for safety. */
  679                 for (i = 0; i < 4; i++) {
  680                         pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
  681                                 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
  682                 }
  683                 /*
  684                  * XXX: since we don't have an API to set prefix (not address)
  685                  * lifetimes, we just use the same lifetimes as addresses.
  686                  * The (temporarily) installed lifetimes can be overridden by
  687                  * later advertised RAs (when accept_rtadv is non 0), which is
  688                  * an intended behavior.
  689                  */
  690                 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
  691                 pr0.ndpr_raf_auto =
  692                         ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
  693                 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
  694                 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
  695 
  696                 /* add the prefix if there's one. */
  697                 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
  698                         /*
  699                          * nd6_prelist_add will install the corresponding
  700                          * interface route.
  701                          */
  702                         if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
  703                                 return (error);
  704                         if (pr == NULL) {
  705                                 log(LOG_ERR, "nd6_prelist_add succeeded but "
  706                                     "no prefix\n");
  707                                 return (EINVAL); /* XXX panic here? */
  708                         }
  709                 }
  710                 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
  711                     == NULL) {
  712                         /* XXX: this should not happen! */
  713                         log(LOG_ERR, "in6_control: addition succeeded, but"
  714                             " no ifaddr\n");
  715                 } else {
  716                         if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
  717                             ia->ia6_ndpr == NULL) { /* new autoconfed addr */
  718                                 ia->ia6_ndpr = pr;
  719                                 pr->ndpr_refcnt++;
  720 
  721                                 /*
  722                                  * If this is the first autoconf address from
  723                                  * the prefix, create a temporary address
  724                                  * as well (when specified).
  725                                  */
  726                                 if (ip6_use_tempaddr &&
  727                                     pr->ndpr_refcnt == 1) {
  728                                         int e;
  729                                         if ((e = in6_tmpifadd(ia, 1)) != 0) {
  730                                                 log(LOG_NOTICE, "in6_control: "
  731                                                     "failed to create a "
  732                                                     "temporary address, "
  733                                                     "errno=%d\n",
  734                                                     e);
  735                                         }
  736                                 }
  737                         }
  738 
  739                         /*
  740                          * this might affect the status of autoconfigured
  741                          * addresses, that is, this address might make
  742                          * other addresses detached.
  743                          */
  744                         pfxlist_onlink_check();
  745                 }
  746                 if (error == 0 && ia) {
  747                         EVENTHANDLER_INVOKE(ifaddr_event, ifp,
  748                         iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
  749                         &ia->ia_ifa);
  750                 }
  751                 break;
  752         }
  753 
  754         case SIOCDIFADDR_IN6:
  755         {
  756                 int i = 0;
  757                 struct nd_prefix pr0, *pr;
  758 
  759                 /*
  760                  * If the address being deleted is the only one that owns
  761                  * the corresponding prefix, expire the prefix as well.
  762                  * XXX: theoretically, we don't have to warry about such
  763                  * relationship, since we separate the address management
  764                  * and the prefix management.  We do this, however, to provide
  765                  * as much backward compatibility as possible in terms of
  766                  * the ioctl operation.
  767                  */
  768                 bzero(&pr0, sizeof(pr0));
  769                 pr0.ndpr_ifp = ifp;
  770                 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr,
  771                                              NULL);
  772                 if (pr0.ndpr_plen == 128)
  773                         goto purgeaddr;
  774                 pr0.ndpr_prefix = ia->ia_addr;
  775                 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr;
  776                 for (i = 0; i < 4; i++) {
  777                         pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
  778                                 ia->ia_prefixmask.sin6_addr.s6_addr32[i];
  779                 }
  780                 /*
  781                  * The logic of the following condition is a bit complicated.
  782                  * We expire the prefix when
  783                  * 1. the address obeys autoconfiguration and it is the
  784                  *    only owner of the associated prefix, or
  785                  * 2. the address does not obey autoconf and there is no
  786                  *    other owner of the prefix.
  787                  */
  788                 if ((pr = nd6_prefix_lookup(&pr0)) != NULL &&
  789                     (((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
  790                        pr->ndpr_refcnt == 1) ||
  791                      (!(ia->ia6_flags & IN6_IFF_AUTOCONF) &&
  792                       pr->ndpr_refcnt == 0))) {
  793                         pr->ndpr_expire = 1; /* XXX: just for expiration */
  794                 }
  795 
  796 purgeaddr:
  797                 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE,
  798                                     &ia->ia_ifa);
  799                 in6_purgeaddr(&ia->ia_ifa);
  800                 break;
  801         }
  802 
  803         default:
  804                 if (ifp == NULL || ifp->if_ioctl == NULL)
  805                         return (EOPNOTSUPP);
  806                 ifnet_serialize_all(ifp);
  807                 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred);
  808                 ifnet_deserialize_all(ifp);
  809                 return (error);
  810         }
  811 
  812         return (0);
  813 }
  814 
  815 /*
  816  * Update parameters of an IPv6 interface address.
  817  * If necessary, a new entry is created and linked into address chains.
  818  * This function is separated from in6_control().
  819  * XXX: should this be performed under splnet()?
  820  */
  821 int
  822 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
  823                struct in6_ifaddr *ia)
  824 {
  825         int error = 0, hostIsNew = 0, plen = -1;
  826         struct in6_ifaddr *oia;
  827         struct sockaddr_in6 dst6;
  828         struct in6_addrlifetime *lt;
  829 
  830         /* Validate parameters */
  831         if (ifp == NULL || ifra == NULL) /* this maybe redundant */
  832                 return (EINVAL);
  833 
  834         /*
  835          * The destination address for a p2p link must have a family
  836          * of AF_UNSPEC or AF_INET6.
  837          */
  838         if ((ifp->if_flags & IFF_POINTOPOINT) &&
  839             ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
  840             ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
  841                 return (EAFNOSUPPORT);
  842         /*
  843          * validate ifra_prefixmask.  don't check sin6_family, netmask
  844          * does not carry fields other than sin6_len.
  845          */
  846         if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
  847                 return (EINVAL);
  848         /*
  849          * Because the IPv6 address architecture is classless, we require
  850          * users to specify a (non 0) prefix length (mask) for a new address.
  851          * We also require the prefix (when specified) mask is valid, and thus
  852          * reject a non-consecutive mask.
  853          */
  854         if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
  855                 return (EINVAL);
  856         if (ifra->ifra_prefixmask.sin6_len != 0) {
  857                 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
  858                                     (u_char *)&ifra->ifra_prefixmask +
  859                                     ifra->ifra_prefixmask.sin6_len);
  860                 if (plen <= 0)
  861                         return (EINVAL);
  862         }
  863         else {
  864                 /*
  865                  * In this case, ia must not be NULL.  We just use its prefix
  866                  * length.
  867                  */
  868                 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
  869         }
  870         /*
  871          * If the destination address on a p2p interface is specified,
  872          * and the address is a scoped one, validate/set the scope
  873          * zone identifier.
  874          */
  875         dst6 = ifra->ifra_dstaddr;
  876         if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) &&
  877             (dst6.sin6_family == AF_INET6)) {
  878                 int scopeid;
  879 
  880                 if ((error = in6_recoverscope(&dst6,
  881                                               &ifra->ifra_dstaddr.sin6_addr,
  882                                               ifp)) != 0)
  883                         return (error);
  884                 scopeid = in6_addr2scopeid(ifp, &dst6.sin6_addr);
  885                 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */
  886                         dst6.sin6_scope_id = scopeid;
  887                 else if (dst6.sin6_scope_id != scopeid)
  888                         return (EINVAL); /* scope ID mismatch. */
  889                 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL))
  890                     != 0)
  891                         return (error);
  892                 dst6.sin6_scope_id = 0; /* XXX */
  893         }
  894         /*
  895          * The destination address can be specified only for a p2p or a
  896          * loopback interface.  If specified, the corresponding prefix length
  897          * must be 128.
  898          */
  899         if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
  900                 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) {
  901                         /* XXX: noisy message */
  902                         log(LOG_INFO, "in6_update_ifa: a destination can be "
  903                             "specified for a p2p or a loopback IF only\n");
  904                         return (EINVAL);
  905                 }
  906                 if (plen != 128) {
  907                         /*
  908                          * The following message seems noisy, but we dare to
  909                          * add it for diagnosis.
  910                          */
  911                         log(LOG_INFO, "in6_update_ifa: prefixlen must be 128 "
  912                             "when dstaddr is specified\n");
  913                         return (EINVAL);
  914                 }
  915         }
  916         /* lifetime consistency check */
  917         lt = &ifra->ifra_lifetime;
  918         if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME
  919             && lt->ia6t_vltime + time_uptime < time_uptime) {
  920                 return EINVAL;
  921         }
  922         if (lt->ia6t_vltime == 0) {
  923                 /*
  924                  * the following log might be noisy, but this is a typical
  925                  * configuration mistake or a tool's bug.
  926                  */
  927                 log(LOG_INFO,
  928                     "in6_update_ifa: valid lifetime is 0 for %s\n",
  929                     ip6_sprintf(&ifra->ifra_addr.sin6_addr));
  930         }
  931         if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME
  932             && lt->ia6t_pltime + time_uptime < time_uptime) {
  933                 return EINVAL;
  934         }
  935 
  936         /*
  937          * If this is a new address, allocate a new ifaddr and link it
  938          * into chains.
  939          */
  940         if (ia == NULL) {
  941                 hostIsNew = 1;
  942                 /*
  943                  * When in6_update_ifa() is called in a process of a received
  944                  * RA, it is called under splnet().  So, we should call malloc
  945                  * with M_NOWAIT.
  946                  */
  947                 ia = ifa_create(sizeof(*ia), M_NOWAIT);
  948                 if (ia == NULL)
  949                         return (ENOBUFS);
  950                 /* Initialize the address and masks */
  951                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
  952                 ia->ia_addr.sin6_family = AF_INET6;
  953                 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
  954                 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
  955                         /*
  956                          * XXX: some functions expect that ifa_dstaddr is not
  957                          * NULL for p2p interfaces.
  958                          */
  959                         ia->ia_ifa.ifa_dstaddr
  960                                 = (struct sockaddr *)&ia->ia_dstaddr;
  961                 } else {
  962                         ia->ia_ifa.ifa_dstaddr = NULL;
  963                 }
  964                 ia->ia_ifa.ifa_netmask
  965                         = (struct sockaddr *)&ia->ia_prefixmask;
  966 
  967                 ia->ia_ifp = ifp;
  968                 if ((oia = in6_ifaddr) != NULL) {
  969                         for ( ; oia->ia_next; oia = oia->ia_next)
  970                                 continue;
  971                         oia->ia_next = ia;
  972                 } else
  973                         in6_ifaddr = ia;
  974 
  975                 ifa_iflink(&ia->ia_ifa, ifp, 1);
  976         }
  977 
  978         /* set prefix mask */
  979         if (ifra->ifra_prefixmask.sin6_len) {
  980                 /*
  981                  * We prohibit changing the prefix length of an existing
  982                  * address, because
  983                  * + such an operation should be rare in IPv6, and
  984                  * + the operation would confuse prefix management.
  985                  */
  986                 if (ia->ia_prefixmask.sin6_len &&
  987                     in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
  988                         log(LOG_INFO, "in6_update_ifa: the prefix length of an"
  989                             " existing (%s) address should not be changed\n",
  990                             ip6_sprintf(&ia->ia_addr.sin6_addr));
  991                         error = EINVAL;
  992                         goto unlink;
  993                 }
  994                 ia->ia_prefixmask = ifra->ifra_prefixmask;
  995         }
  996 
  997         /*
  998          * If a new destination address is specified, scrub the old one and
  999          * install the new destination.  Note that the interface must be
 1000          * p2p or loopback (see the check above.)
 1001          */
 1002         if (dst6.sin6_family == AF_INET6 &&
 1003             !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr,
 1004                                 &ia->ia_dstaddr.sin6_addr)) {
 1005                 int e;
 1006 
 1007                 if ((ia->ia_flags & IFA_ROUTE) &&
 1008                     (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
 1009                     != 0) {
 1010                         log(LOG_ERR, "in6_update_ifa: failed to remove "
 1011                             "a route to the old destination: %s\n",
 1012                             ip6_sprintf(&ia->ia_addr.sin6_addr));
 1013                         /* proceed anyway... */
 1014                 }
 1015                 else
 1016                         ia->ia_flags &= ~IFA_ROUTE;
 1017                 ia->ia_dstaddr = dst6;
 1018         }
 1019 
 1020         /* reset the interface and routing table appropriately. */
 1021         if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
 1022                 goto unlink;
 1023 
 1024         /*
 1025          * Beyond this point, we should call in6_purgeaddr upon an error,
 1026          * not just go to unlink.
 1027          */
 1028 
 1029 #if 0                           /* disable this mechanism for now */
 1030         /* update prefix list */
 1031         if (hostIsNew &&
 1032             (ifra->ifra_flags & IN6_IFF_NOPFX) == 0) { /* XXX */
 1033                 int iilen;
 1034 
 1035                 iilen = (sizeof(ia->ia_prefixmask.sin6_addr) << 3) - plen;
 1036                 if ((error = in6_prefix_add_ifid(iilen, ia)) != 0) {
 1037                         in6_purgeaddr((struct ifaddr *)ia);
 1038                         return (error);
 1039                 }
 1040         }
 1041 #endif
 1042 
 1043         if (ifp->if_flags & IFF_MULTICAST) {
 1044                 struct sockaddr_in6 mltaddr, mltmask;
 1045                 struct in6_multi *in6m;
 1046 
 1047                 if (hostIsNew) {
 1048                         /*
 1049                          * join solicited multicast addr for new host id
 1050                          */
 1051                         struct in6_addr llsol;
 1052                         bzero(&llsol, sizeof(struct in6_addr));
 1053                         llsol.s6_addr16[0] = htons(0xff02);
 1054                         llsol.s6_addr16[1] = htons(ifp->if_index);
 1055                         llsol.s6_addr32[1] = 0;
 1056                         llsol.s6_addr32[2] = htonl(1);
 1057                         llsol.s6_addr32[3] =
 1058                                 ifra->ifra_addr.sin6_addr.s6_addr32[3];
 1059                         llsol.s6_addr8[12] = 0xff;
 1060                         in6_addmulti(&llsol, ifp, &error);
 1061                         if (error != 0) {
 1062                                 log(LOG_WARNING,
 1063                                     "in6_update_ifa: addmulti failed for "
 1064                                     "%s on %s (errno=%d)\n",
 1065                                     ip6_sprintf(&llsol), if_name(ifp),
 1066                                     error);
 1067                                 in6_purgeaddr((struct ifaddr *)ia);
 1068                                 return (error);
 1069                         }
 1070                 }
 1071 
 1072                 bzero(&mltmask, sizeof(mltmask));
 1073                 mltmask.sin6_len = sizeof(struct sockaddr_in6);
 1074                 mltmask.sin6_family = AF_INET6;
 1075                 mltmask.sin6_addr = in6mask32;
 1076 
 1077                 /*
 1078                  * join link-local all-nodes address
 1079                  */
 1080                 bzero(&mltaddr, sizeof(mltaddr));
 1081                 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
 1082                 mltaddr.sin6_family = AF_INET6;
 1083                 mltaddr.sin6_addr = kin6addr_linklocal_allnodes;
 1084                 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
 1085 
 1086                 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
 1087                 if (in6m == NULL) {
 1088                         rtrequest_global(RTM_ADD,
 1089                                   (struct sockaddr *)&mltaddr,
 1090                                   (struct sockaddr *)&ia->ia_addr,
 1091                                   (struct sockaddr *)&mltmask,
 1092                                   RTF_UP|RTF_CLONING);  /* xxx */
 1093                         in6_addmulti(&mltaddr.sin6_addr, ifp, &error);
 1094                         if (error != 0) {
 1095                                 log(LOG_WARNING,
 1096                                     "in6_update_ifa: addmulti failed for "
 1097                                     "%s on %s (errno=%d)\n",
 1098                                     ip6_sprintf(&mltaddr.sin6_addr),
 1099                                     if_name(ifp), error);
 1100                         }
 1101                 }
 1102 
 1103                 /*
 1104                  * join node information group address
 1105                  */
 1106 #define hostnamelen     strlen(hostname)
 1107                 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr)
 1108                     == 0) {
 1109                         IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
 1110                         if (in6m == NULL && ia != NULL) {
 1111                                 in6_addmulti(&mltaddr.sin6_addr, ifp, &error);
 1112                                 if (error != 0) {
 1113                                         log(LOG_WARNING, "in6_update_ifa: "
 1114                                             "addmulti failed for "
 1115                                             "%s on %s (errno=%d)\n",
 1116                                             ip6_sprintf(&mltaddr.sin6_addr),
 1117                                             if_name(ifp), error);
 1118                                 }
 1119                         }
 1120                 }
 1121 #undef hostnamelen
 1122 
 1123                 /*
 1124                  * join node-local all-nodes address, on loopback.
 1125                  * XXX: since "node-local" is obsoleted by interface-local,
 1126                  *      we have to join the group on every interface with
 1127                  *      some interface-boundary restriction.
 1128                  */
 1129                 if (ifp->if_flags & IFF_LOOPBACK) {
 1130                         struct in6_ifaddr *ia_loop;
 1131 
 1132                         struct in6_addr loop6 = kin6addr_loopback;
 1133                         ia_loop = in6ifa_ifpwithaddr(ifp, &loop6);
 1134 
 1135                         mltaddr.sin6_addr = kin6addr_nodelocal_allnodes;
 1136 
 1137                         IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
 1138                         if (in6m == NULL && ia_loop != NULL) {
 1139                                 rtrequest_global(RTM_ADD,
 1140                                           (struct sockaddr *)&mltaddr,
 1141                                           (struct sockaddr *)&ia_loop->ia_addr,
 1142                                           (struct sockaddr *)&mltmask,
 1143                                           RTF_UP);
 1144                                 in6_addmulti(&mltaddr.sin6_addr, ifp, &error);
 1145                                 if (error != 0) {
 1146                                         log(LOG_WARNING, "in6_update_ifa: "
 1147                                             "addmulti failed for %s on %s "
 1148                                             "(errno=%d)\n",
 1149                                             ip6_sprintf(&mltaddr.sin6_addr),
 1150                                             if_name(ifp), error);
 1151                                 }
 1152                         }
 1153                 }
 1154         }
 1155 
 1156         ia->ia6_flags = ifra->ifra_flags;
 1157         ia->ia6_flags &= ~IN6_IFF_DUPLICATED;   /*safety*/
 1158         ia->ia6_flags &= ~IN6_IFF_NODAD;        /* Mobile IPv6 */
 1159 
 1160         ia->ia6_lifetime = ifra->ifra_lifetime;
 1161         /* for sanity */
 1162         if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
 1163                 ia->ia6_lifetime.ia6t_expire =
 1164                         time_uptime + ia->ia6_lifetime.ia6t_vltime;
 1165         } else
 1166                 ia->ia6_lifetime.ia6t_expire = 0;
 1167         if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
 1168                 ia->ia6_lifetime.ia6t_preferred =
 1169                         time_uptime + ia->ia6_lifetime.ia6t_pltime;
 1170         } else
 1171                 ia->ia6_lifetime.ia6t_preferred = 0;
 1172 
 1173         /*
 1174          * Perform DAD, if needed.
 1175          * XXX It may be of use, if we can administratively
 1176          * disable DAD.
 1177          */
 1178         if (in6if_do_dad(ifp) && !(ifra->ifra_flags & IN6_IFF_NODAD)) {
 1179                 ia->ia6_flags |= IN6_IFF_TENTATIVE;
 1180                 nd6_dad_start((struct ifaddr *)ia, NULL);
 1181         }
 1182 
 1183         return (error);
 1184 
 1185 unlink:
 1186         /*
 1187          * XXX: if a change of an existing address failed, keep the entry
 1188          * anyway.
 1189          */
 1190         if (hostIsNew)
 1191                 in6_unlink_ifa(ia, ifp);
 1192         return (error);
 1193 }
 1194 
 1195 void
 1196 in6_purgeaddr(struct ifaddr *ifa)
 1197 {
 1198         struct ifnet *ifp = ifa->ifa_ifp;
 1199         struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
 1200 
 1201         /* stop DAD processing */
 1202         nd6_dad_stop(ifa);
 1203 
 1204         /*
 1205          * delete route to the destination of the address being purged.
 1206          * The interface must be p2p or loopback in this case.
 1207          */
 1208         if ((ia->ia_flags & IFA_ROUTE) && ia->ia_dstaddr.sin6_len != 0) {
 1209                 int e;
 1210 
 1211                 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
 1212                     != 0) {
 1213                         log(LOG_ERR, "in6_purgeaddr: failed to remove "
 1214                             "a route to the p2p destination: %s on %s, "
 1215                             "errno=%d\n",
 1216                             ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp),
 1217                             e);
 1218                         /* proceed anyway... */
 1219                 }
 1220                 else
 1221                         ia->ia_flags &= ~IFA_ROUTE;
 1222         }
 1223 
 1224         /* Remove ownaddr's loopback rtentry, if it exists. */
 1225         in6_ifremloop(&(ia->ia_ifa));
 1226 
 1227         if (ifp->if_flags & IFF_MULTICAST) {
 1228                 /*
 1229                  * delete solicited multicast addr for deleting host id
 1230                  */
 1231                 struct in6_multi *in6m;
 1232                 struct in6_addr llsol;
 1233                 bzero(&llsol, sizeof(struct in6_addr));
 1234                 llsol.s6_addr16[0] = htons(0xff02);
 1235                 llsol.s6_addr16[1] = htons(ifp->if_index);
 1236                 llsol.s6_addr32[1] = 0;
 1237                 llsol.s6_addr32[2] = htonl(1);
 1238                 llsol.s6_addr32[3] =
 1239                         ia->ia_addr.sin6_addr.s6_addr32[3];
 1240                 llsol.s6_addr8[12] = 0xff;
 1241 
 1242                 IN6_LOOKUP_MULTI(llsol, ifp, in6m);
 1243                 if (in6m)
 1244                         in6_delmulti(in6m);
 1245         }
 1246 
 1247         in6_unlink_ifa(ia, ifp);
 1248 }
 1249 
 1250 static void
 1251 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
 1252 {
 1253         int plen, iilen;
 1254         struct in6_ifaddr *oia;
 1255 
 1256         crit_enter();
 1257 
 1258         ifa_ifunlink(&ia->ia_ifa, ifp);
 1259 
 1260         oia = ia;
 1261         if (oia == (ia = in6_ifaddr))
 1262                 in6_ifaddr = ia->ia_next;
 1263         else {
 1264                 while (ia->ia_next && (ia->ia_next != oia))
 1265                         ia = ia->ia_next;
 1266                 if (ia->ia_next)
 1267                         ia->ia_next = oia->ia_next;
 1268                 else {
 1269                         /* search failed */
 1270                         kprintf("Couldn't unlink in6_ifaddr from in6_ifaddr\n");
 1271                 }
 1272         }
 1273 
 1274         if (oia->ia6_ifpr) {    /* check for safety */
 1275                 plen = in6_mask2len(&oia->ia_prefixmask.sin6_addr, NULL);
 1276                 iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - plen;
 1277                 in6_prefix_remove_ifid(iilen, oia);
 1278         }
 1279 
 1280         /*
 1281          * When an autoconfigured address is being removed, release the
 1282          * reference to the base prefix.  Also, since the release might
 1283          * affect the status of other (detached) addresses, call
 1284          * pfxlist_onlink_check().
 1285          */
 1286         if (oia->ia6_flags & IN6_IFF_AUTOCONF) {
 1287                 if (oia->ia6_ndpr == NULL) {
 1288                         log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address "
 1289                             "%p has no prefix\n", oia);
 1290                 } else {
 1291                         oia->ia6_ndpr->ndpr_refcnt--;
 1292                         oia->ia6_flags &= ~IN6_IFF_AUTOCONF;
 1293                         oia->ia6_ndpr = NULL;
 1294                 }
 1295 
 1296                 pfxlist_onlink_check();
 1297         }
 1298 
 1299         /*
 1300          * release another refcnt for the link from in6_ifaddr.
 1301          * Note that we should decrement the refcnt at least once for all *BSD.
 1302          */
 1303         ifa_destroy(&oia->ia_ifa);
 1304 
 1305         crit_exit();
 1306 }
 1307 
 1308 void
 1309 in6_purgeif(struct ifnet *ifp)
 1310 {
 1311         struct ifaddr_container *ifac, *next;
 1312 
 1313         TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid],
 1314                               ifa_link, next) {
 1315                 if (ifac->ifa->ifa_addr->sa_family != AF_INET6)
 1316                         continue;
 1317                 in6_purgeaddr(ifac->ifa);
 1318         }
 1319 
 1320         in6_ifdetach(ifp);
 1321 }
 1322 
 1323 /*
 1324  * SIOC[GAD]LIFADDR.
 1325  *      SIOCGLIFADDR: get first address. (?)
 1326  *      SIOCGLIFADDR with IFLR_PREFIX:
 1327  *              get first address that matches the specified prefix.
 1328  *      SIOCALIFADDR: add the specified address.
 1329  *      SIOCALIFADDR with IFLR_PREFIX:
 1330  *              add the specified prefix, filling hostid part from
 1331  *              the first link-local address.  prefixlen must be <= 64.
 1332  *      SIOCDLIFADDR: delete the specified address.
 1333  *      SIOCDLIFADDR with IFLR_PREFIX:
 1334  *              delete the first address that matches the specified prefix.
 1335  * return values:
 1336  *      EINVAL on invalid parameters
 1337  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 1338  *      other values may be returned from in6_ioctl()
 1339  *
 1340  * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
 1341  * this is to accomodate address naming scheme other than RFC2374,
 1342  * in the future.
 1343  * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
 1344  * address encoding scheme. (see figure on page 8)
 1345  */
 1346 static int
 1347 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
 1348                   struct ifnet *ifp, struct thread *td)
 1349 {
 1350         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
 1351         struct sockaddr *sa;
 1352 
 1353         /* sanity checks */
 1354         if (!data || !ifp) {
 1355                 panic("invalid argument to in6_lifaddr_ioctl");
 1356                 /*NOTRECHED*/
 1357         }
 1358 
 1359         switch (cmd) {
 1360         case SIOCGLIFADDR:
 1361                 /* address must be specified on GET with IFLR_PREFIX */
 1362                 if (!(iflr->flags & IFLR_PREFIX))
 1363                         break;
 1364                 /* FALLTHROUGH */
 1365         case SIOCALIFADDR:
 1366         case SIOCDLIFADDR:
 1367                 /* address must be specified on ADD and DELETE */
 1368                 sa = (struct sockaddr *)&iflr->addr;
 1369                 if (sa->sa_family != AF_INET6)
 1370                         return EINVAL;
 1371                 if (sa->sa_len != sizeof(struct sockaddr_in6))
 1372                         return EINVAL;
 1373                 /* XXX need improvement */
 1374                 sa = (struct sockaddr *)&iflr->dstaddr;
 1375                 if (sa->sa_family && sa->sa_family != AF_INET6)
 1376                         return EINVAL;
 1377                 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
 1378                         return EINVAL;
 1379                 break;
 1380         default: /* shouldn't happen */
 1381 #if 0
 1382                 panic("invalid cmd to in6_lifaddr_ioctl");
 1383                 /* NOTREACHED */
 1384 #else
 1385                 return EOPNOTSUPP;
 1386 #endif
 1387         }
 1388         if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
 1389                 return EINVAL;
 1390 
 1391         switch (cmd) {
 1392         case SIOCALIFADDR:
 1393             {
 1394                 struct in6_aliasreq ifra;
 1395                 struct in6_addr *hostid = NULL;
 1396                 int prefixlen;
 1397 
 1398                 if (iflr->flags & IFLR_PREFIX) {
 1399                         struct ifaddr *ifa;
 1400                         struct sockaddr_in6 *sin6;
 1401 
 1402                         /*
 1403                          * hostid is to fill in the hostid part of the
 1404                          * address.  hostid points to the first link-local
 1405                          * address attached to the interface.
 1406                          */
 1407                         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
 1408                         if (!ifa)
 1409                                 return EADDRNOTAVAIL;
 1410                         hostid = IFA_IN6(ifa);
 1411 
 1412                         /* prefixlen must be <= 64. */
 1413                         if (64 < iflr->prefixlen)
 1414                                 return EINVAL;
 1415                         prefixlen = iflr->prefixlen;
 1416 
 1417                         /* hostid part must be zero. */
 1418                         sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1419                         if (sin6->sin6_addr.s6_addr32[2] != 0
 1420                          || sin6->sin6_addr.s6_addr32[3] != 0) {
 1421                                 return EINVAL;
 1422                         }
 1423                 } else
 1424                         prefixlen = iflr->prefixlen;
 1425 
 1426                 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
 1427                 bzero(&ifra, sizeof(ifra));
 1428                 bcopy(iflr->iflr_name, ifra.ifra_name,
 1429                         sizeof(ifra.ifra_name));
 1430 
 1431                 bcopy(&iflr->addr, &ifra.ifra_addr,
 1432                         ((struct sockaddr *)&iflr->addr)->sa_len);
 1433                 if (hostid) {
 1434                         /* fill in hostid part */
 1435                         ifra.ifra_addr.sin6_addr.s6_addr32[2] =
 1436                                 hostid->s6_addr32[2];
 1437                         ifra.ifra_addr.sin6_addr.s6_addr32[3] =
 1438                                 hostid->s6_addr32[3];
 1439                 }
 1440 
 1441                 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) {   /*XXX*/
 1442                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
 1443                                 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
 1444                         if (hostid) {
 1445                                 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
 1446                                         hostid->s6_addr32[2];
 1447                                 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
 1448                                         hostid->s6_addr32[3];
 1449                         }
 1450                 }
 1451 
 1452                 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1453                 in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
 1454 
 1455                 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
 1456                 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
 1457             }
 1458         case SIOCGLIFADDR:
 1459         case SIOCDLIFADDR:
 1460             {
 1461                 struct ifaddr_container *ifac;
 1462                 struct in6_ifaddr *ia;
 1463                 struct in6_addr mask, candidate, match;
 1464                 struct sockaddr_in6 *sin6;
 1465                 int cmp;
 1466 
 1467                 bzero(&mask, sizeof(mask));
 1468                 if (iflr->flags & IFLR_PREFIX) {
 1469                         /* lookup a prefix rather than address. */
 1470                         in6_len2mask(&mask, iflr->prefixlen);
 1471 
 1472                         sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1473                         bcopy(&sin6->sin6_addr, &match, sizeof(match));
 1474                         match.s6_addr32[0] &= mask.s6_addr32[0];
 1475                         match.s6_addr32[1] &= mask.s6_addr32[1];
 1476                         match.s6_addr32[2] &= mask.s6_addr32[2];
 1477                         match.s6_addr32[3] &= mask.s6_addr32[3];
 1478 
 1479                         /* if you set extra bits, that's wrong */
 1480                         if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
 1481                                 return EINVAL;
 1482 
 1483                         cmp = 1;
 1484                 } else {
 1485                         if (cmd == SIOCGLIFADDR) {
 1486                                 /* on getting an address, take the 1st match */
 1487                                 cmp = 0;        /* XXX */
 1488                         } else {
 1489                                 /* on deleting an address, do exact match */
 1490                                 in6_len2mask(&mask, 128);
 1491                                 sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1492                                 bcopy(&sin6->sin6_addr, &match, sizeof(match));
 1493 
 1494                                 cmp = 1;
 1495                         }
 1496                 }
 1497 
 1498                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 1499                         struct ifaddr *ifa = ifac->ifa;
 1500 
 1501                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1502                                 continue;
 1503                         if (!cmp)
 1504                                 break;
 1505 
 1506                         bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
 1507                         /*
 1508                          * XXX: this is adhoc, but is necessary to allow
 1509                          * a user to specify fe80::/64 (not /10) for a
 1510                          * link-local address.
 1511                          */
 1512                         if (IN6_IS_ADDR_LINKLOCAL(&candidate))
 1513                                 candidate.s6_addr16[1] = 0;
 1514                         candidate.s6_addr32[0] &= mask.s6_addr32[0];
 1515                         candidate.s6_addr32[1] &= mask.s6_addr32[1];
 1516                         candidate.s6_addr32[2] &= mask.s6_addr32[2];
 1517                         candidate.s6_addr32[3] &= mask.s6_addr32[3];
 1518                         if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
 1519                                 break;
 1520                 }
 1521                 if (ifac == NULL)
 1522                         return EADDRNOTAVAIL;
 1523                 ia = ifa2ia6(ifac->ifa);
 1524 
 1525                 if (cmd == SIOCGLIFADDR) {
 1526                         struct sockaddr_in6 *s6;
 1527 
 1528                         /* fill in the if_laddrreq structure */
 1529                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
 1530                         s6 = (struct sockaddr_in6 *)&iflr->addr;
 1531                         if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) {
 1532                                 s6->sin6_addr.s6_addr16[1] = 0;
 1533                                 s6->sin6_scope_id =
 1534                                         in6_addr2scopeid(ifp, &s6->sin6_addr);
 1535                         }
 1536                         if (ifp->if_flags & IFF_POINTOPOINT) {
 1537                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 1538                                         ia->ia_dstaddr.sin6_len);
 1539                                 s6 = (struct sockaddr_in6 *)&iflr->dstaddr;
 1540                                 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) {
 1541                                         s6->sin6_addr.s6_addr16[1] = 0;
 1542                                         s6->sin6_scope_id =
 1543                                                 in6_addr2scopeid(ifp,
 1544                                                                  &s6->sin6_addr);
 1545                                 }
 1546                         } else
 1547                                 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
 1548 
 1549                         iflr->prefixlen =
 1550                                 in6_mask2len(&ia->ia_prefixmask.sin6_addr,
 1551                                              NULL);
 1552 
 1553                         iflr->flags = ia->ia6_flags;    /* XXX */
 1554 
 1555                         return 0;
 1556                 } else {
 1557                         struct in6_aliasreq ifra;
 1558 
 1559                         /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 1560                         bzero(&ifra, sizeof(ifra));
 1561                         bcopy(iflr->iflr_name, ifra.ifra_name,
 1562                               sizeof(ifra.ifra_name));
 1563 
 1564                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 1565                               ia->ia_addr.sin6_len);
 1566                         if (ifp->if_flags & IFF_POINTOPOINT)
 1567                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 1568                                       ia->ia_dstaddr.sin6_len);
 1569                         else
 1570                                 bzero(&ifra.ifra_dstaddr,
 1571                                       sizeof(ifra.ifra_dstaddr));
 1572                         bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
 1573                               ia->ia_prefixmask.sin6_len);
 1574 
 1575                         ifra.ifra_flags = ia->ia6_flags;
 1576                         return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
 1577                                 ifp, td);
 1578                 }
 1579             }
 1580         }
 1581 
 1582         return EOPNOTSUPP;      /* just for safety */
 1583 }
 1584 
 1585 /*
 1586  * Initialize an interface's intetnet6 address
 1587  * and routing table entry.
 1588  */
 1589 static int
 1590 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, struct sockaddr_in6 *sin6,
 1591            int newhost)
 1592 {
 1593         int     error = 0, plen, ifacount = 0;
 1594         struct ifaddr_container *ifac;
 1595 
 1596         /*
 1597          * Give the interface a chance to initialize
 1598          * if this is its first address,
 1599          * and to validate the address if necessary.
 1600          */
 1601         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 1602                 if (ifac->ifa->ifa_addr == NULL)
 1603                         continue;       /* just for safety */
 1604                 if (ifac->ifa->ifa_addr->sa_family != AF_INET6)
 1605                         continue;
 1606                 ifacount++;
 1607         }
 1608 
 1609         ifnet_serialize_all(ifp);
 1610 
 1611         ia->ia_addr = *sin6;
 1612 
 1613         if (ifacount <= 1 && ifp->if_ioctl &&
 1614             (error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL))) {
 1615                 ifnet_deserialize_all(ifp);
 1616                 return (error);
 1617         }
 1618 
 1619         ifnet_deserialize_all(ifp);
 1620 
 1621         ia->ia_ifa.ifa_metric = ifp->if_metric;
 1622 
 1623         /* we could do in(6)_socktrim here, but just omit it at this moment. */
 1624 
 1625         /*
 1626          * Special case:
 1627          * If the destination address is specified for a point-to-point
 1628          * interface, install a route to the destination as an interface
 1629          * direct route.
 1630          */
 1631         plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
 1632         if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) {
 1633                 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD,
 1634                                     RTF_UP | RTF_HOST)) != 0)
 1635                         return (error);
 1636                 ia->ia_flags |= IFA_ROUTE;
 1637         }
 1638         if (plen < 128) {
 1639                 /*
 1640                  * The RTF_CLONING flag is necessary for in6_is_ifloop_auto().
 1641                  */
 1642                 ia->ia_ifa.ifa_flags |= RTF_CLONING;
 1643         }
 1644 
 1645         /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
 1646         if (newhost) {
 1647                 /* set the rtrequest function to create llinfo */
 1648                 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
 1649                 in6_ifaddloop(&(ia->ia_ifa));
 1650         }
 1651 
 1652         return (error);
 1653 }
 1654 
 1655 struct in6_multi_mship *
 1656 in6_joingroup(struct ifnet *ifp, struct in6_addr *addr, int *errorp)
 1657 {
 1658        struct in6_multi_mship *imm;
 1659 
 1660        imm = kmalloc(sizeof(*imm), M_IPMADDR, M_NOWAIT);
 1661        if (!imm) {
 1662                *errorp = ENOBUFS;
 1663                return NULL;
 1664        }
 1665        imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp);
 1666        if (!imm->i6mm_maddr) {
 1667                /* *errorp is alrady set */
 1668                kfree(imm, M_IPMADDR);
 1669                return NULL;
 1670        }
 1671        return imm;
 1672 }
 1673 
 1674 int
 1675 in6_leavegroup(struct in6_multi_mship *imm)
 1676 {
 1677 
 1678        if (imm->i6mm_maddr)
 1679                in6_delmulti(imm->i6mm_maddr);
 1680        kfree(imm,  M_IPMADDR);
 1681        return 0;
 1682 }
 1683 
 1684 /*
 1685  * Add an address to the list of IP6 multicast addresses for a
 1686  * given interface.
 1687  */
 1688 struct  in6_multi *
 1689 in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, int *errorp)
 1690 {
 1691         struct  in6_multi *in6m;
 1692         struct sockaddr_in6 sin6;
 1693         struct ifmultiaddr *ifma;
 1694 
 1695         *errorp = 0;
 1696 
 1697         crit_enter();
 1698 
 1699         /*
 1700          * Call generic routine to add membership or increment
 1701          * refcount.  It wants addresses in the form of a sockaddr,
 1702          * so we build one here (being careful to zero the unused bytes).
 1703          */
 1704         bzero(&sin6, sizeof sin6);
 1705         sin6.sin6_family = AF_INET6;
 1706         sin6.sin6_len = sizeof sin6;
 1707         sin6.sin6_addr = *maddr6;
 1708         *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma);
 1709         if (*errorp) {
 1710                 crit_exit();
 1711                 return 0;
 1712         }
 1713 
 1714         /*
 1715          * If ifma->ifma_protospec is null, then if_addmulti() created
 1716          * a new record.  Otherwise, we are done.
 1717          */
 1718         if (ifma->ifma_protospec != NULL) {
 1719                 crit_exit();
 1720                 return ifma->ifma_protospec;
 1721         }
 1722 
 1723         /* XXX - if_addmulti uses M_WAITOK.  Can this really be called
 1724            at interrupt time?  If so, need to fix if_addmulti. XXX */
 1725         in6m = (struct in6_multi *)kmalloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT);
 1726         if (in6m == NULL) {
 1727                 crit_exit();
 1728                 return (NULL);
 1729         }
 1730 
 1731         bzero(in6m, sizeof *in6m);
 1732         in6m->in6m_addr = *maddr6;
 1733         in6m->in6m_ifp = ifp;
 1734         in6m->in6m_ifma = ifma;
 1735         ifma->ifma_protospec = in6m;
 1736         LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry);
 1737 
 1738         /*
 1739          * Let MLD6 know that we have joined a new IP6 multicast
 1740          * group.
 1741          */
 1742         mld6_start_listening(in6m);
 1743         crit_exit();
 1744         return (in6m);
 1745 }
 1746 
 1747 /*
 1748  * Delete a multicast address record.
 1749  */
 1750 void
 1751 in6_delmulti(struct in6_multi *in6m)
 1752 {
 1753         struct ifmultiaddr *ifma = in6m->in6m_ifma;
 1754 
 1755         crit_enter();
 1756 
 1757         if (ifma->ifma_refcount == 1) {
 1758                 /*
 1759                  * No remaining claims to this record; let MLD6 know
 1760                  * that we are leaving the multicast group.
 1761                  */
 1762                 mld6_stop_listening(in6m);
 1763                 ifma->ifma_protospec = NULL;
 1764                 LIST_REMOVE(in6m, in6m_entry);
 1765                 kfree(in6m, M_IPMADDR);
 1766         }
 1767         /* XXX - should be separate API for when we have an ifma? */
 1768         if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
 1769         crit_exit();
 1770 }
 1771 
 1772 /*
 1773  * Find an IPv6 interface link-local address specific to an interface.
 1774  */
 1775 struct in6_ifaddr *
 1776 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
 1777 {
 1778         struct ifaddr_container *ifac;
 1779 
 1780         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 1781                 struct ifaddr *ifa = ifac->ifa;
 1782 
 1783                 if (ifa->ifa_addr == NULL)
 1784                         continue;       /* just for safety */
 1785                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1786                         continue;
 1787                 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
 1788                         if ((((struct in6_ifaddr *)ifa)->ia6_flags &
 1789                              ignoreflags) != 0)
 1790                                 continue;
 1791                         break;
 1792                 }
 1793         }
 1794         if (ifac != NULL)
 1795                 return ((struct in6_ifaddr *)(ifac->ifa));
 1796         else
 1797                 return (NULL);
 1798 }
 1799 
 1800 
 1801 /*
 1802  * find the internet address corresponding to a given interface and address.
 1803  */
 1804 struct in6_ifaddr *
 1805 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
 1806 {
 1807         struct ifaddr_container *ifac;
 1808 
 1809         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 1810                 struct ifaddr *ifa = ifac->ifa;
 1811 
 1812                 if (ifa->ifa_addr == NULL)
 1813                         continue;       /* just for safety */
 1814                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1815                         continue;
 1816                 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
 1817                         break;
 1818         }
 1819         if (ifac != NULL)
 1820                 return ((struct in6_ifaddr *)(ifac->ifa));
 1821         else
 1822                 return (NULL);
 1823 }
 1824 
 1825 /*
 1826  * find the internet address on a given interface corresponding to a neighbor's
 1827  * address.
 1828  */
 1829 struct in6_ifaddr *
 1830 in6ifa_ifplocaladdr(const struct ifnet *ifp, const struct in6_addr *addr)
 1831 {
 1832         struct ifaddr *ifa;
 1833         struct in6_ifaddr *ia;
 1834         struct ifaddr_container *ifac;
 1835 
 1836         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 1837                 ifa = ifac->ifa;
 1838 
 1839                 if (ifa->ifa_addr == NULL)
 1840                         continue;       /* just for safety */
 1841                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1842                         continue;
 1843                 ia = (struct in6_ifaddr *)ifa;
 1844                 if (IN6_ARE_MASKED_ADDR_EQUAL(addr,
 1845                                 &ia->ia_addr.sin6_addr,
 1846                                 &ia->ia_prefixmask.sin6_addr))
 1847                         return ia;
 1848         }
 1849 
 1850         return NULL;
 1851 }
 1852 
 1853 /*
 1854  * Convert IP6 address to printable (loggable) representation.
 1855  */
 1856 static char digits[] = "0123456789abcdef";
 1857 static int ip6round = 0;
 1858 char *
 1859 ip6_sprintf(const struct in6_addr *addr)
 1860 {
 1861         static char ip6buf[8][48];
 1862         int i;
 1863         char *cp;
 1864         const u_short *a = (const u_short *)addr;
 1865         const u_char *d;
 1866         int dcolon = 0;
 1867 
 1868         ip6round = (ip6round + 1) & 7;
 1869         cp = ip6buf[ip6round];
 1870 
 1871         for (i = 0; i < 8; i++) {
 1872                 if (dcolon == 1) {
 1873                         if (*a == 0) {
 1874                                 if (i == 7)
 1875                                         *cp++ = ':';
 1876                                 a++;
 1877                                 continue;
 1878                         } else
 1879                                 dcolon = 2;
 1880                 }
 1881                 if (*a == 0) {
 1882                         if (dcolon == 0 && *(a + 1) == 0) {
 1883                                 if (i == 0)
 1884                                         *cp++ = ':';
 1885                                 *cp++ = ':';
 1886                                 dcolon = 1;
 1887                         } else {
 1888                                 *cp++ = '';
 1889                                 *cp++ = ':';
 1890                         }
 1891                         a++;
 1892                         continue;
 1893                 }
 1894                 d = (const u_char *)a;
 1895                 *cp++ = digits[*d >> 4];
 1896                 *cp++ = digits[*d++ & 0xf];
 1897                 *cp++ = digits[*d >> 4];
 1898                 *cp++ = digits[*d & 0xf];
 1899                 *cp++ = ':';
 1900                 a++;
 1901         }
 1902         *--cp = 0;
 1903         return (ip6buf[ip6round]);
 1904 }
 1905 
 1906 int
 1907 in6_localaddr(struct in6_addr *in6)
 1908 {
 1909         struct in6_ifaddr *ia;
 1910 
 1911         if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
 1912                 return 1;
 1913 
 1914         for (ia = in6_ifaddr; ia; ia = ia->ia_next)
 1915                 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
 1916                                               &ia->ia_prefixmask.sin6_addr))
 1917                         return 1;
 1918 
 1919         return (0);
 1920 }
 1921 
 1922 int
 1923 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
 1924 {
 1925         struct in6_ifaddr *ia;
 1926 
 1927         for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
 1928                 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
 1929                                        &sa6->sin6_addr) &&
 1930                     (ia->ia6_flags & IN6_IFF_DEPRECATED))
 1931                         return (1); /* true */
 1932 
 1933                 /* XXX: do we still have to go thru the rest of the list? */
 1934         }
 1935 
 1936         return (0);             /* false */
 1937 }
 1938 
 1939 /*
 1940  * return length of part which dst and src are equal
 1941  * hard coding...
 1942  */
 1943 int
 1944 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
 1945 {
 1946         int match = 0;
 1947         u_char *s = (u_char *)src, *d = (u_char *)dst;
 1948         u_char *lim = s + 16, r;
 1949 
 1950         while (s < lim)
 1951                 if ((r = (*d++ ^ *s++)) != 0) {
 1952                         while (r < 128) {
 1953                                 match++;
 1954                                 r <<= 1;
 1955                         }
 1956                         break;
 1957                 } else
 1958                         match += 8;
 1959         return match;
 1960 }
 1961 
 1962 /* XXX: to be scope conscious */
 1963 int
 1964 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
 1965 {
 1966         int bytelen, bitlen;
 1967 
 1968         /* sanity check */
 1969         if (0 > len || len > 128) {
 1970                 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
 1971                     len);
 1972                 return (0);
 1973         }
 1974 
 1975         bytelen = len / 8;
 1976         bitlen = len % 8;
 1977 
 1978         if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
 1979                 return (0);
 1980         if (p1->s6_addr[bytelen] >> (8 - bitlen) !=
 1981             p2->s6_addr[bytelen] >> (8 - bitlen))
 1982                 return (0);
 1983 
 1984         return (1);
 1985 }
 1986 
 1987 void
 1988 in6_prefixlen2mask(struct in6_addr *maskp, int len)
 1989 {
 1990         u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
 1991         int bytelen, bitlen, i;
 1992 
 1993         /* sanity check */
 1994         if (0 > len || len > 128) {
 1995                 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
 1996                     len);
 1997                 return;
 1998         }
 1999 
 2000         bzero(maskp, sizeof(*maskp));
 2001         bytelen = len / 8;
 2002         bitlen = len % 8;
 2003         for (i = 0; i < bytelen; i++)
 2004                 maskp->s6_addr[i] = 0xff;
 2005         if (bitlen)
 2006                 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
 2007 }
 2008 
 2009 /*
 2010  * return the best address out of the same scope
 2011  */
 2012 struct in6_ifaddr *
 2013 in6_ifawithscope(struct ifnet *oifp, struct in6_addr *dst)
 2014 {
 2015         int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0;
 2016         int blen = -1;
 2017         struct ifnet *ifp;
 2018         struct in6_ifaddr *ifa_best = NULL;
 2019 
 2020         if (oifp == NULL) {
 2021 #if 0
 2022                 kprintf("in6_ifawithscope: output interface is not specified\n");
 2023 #endif
 2024                 return (NULL);
 2025         }
 2026 
 2027         /*
 2028          * We search for all addresses on all interfaces from the beginning.
 2029          * Comparing an interface with the outgoing interface will be done
 2030          * only at the final stage of tiebreaking.
 2031          */
 2032         for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
 2033         {
 2034                 struct ifaddr_container *ifac;
 2035 
 2036                 /*
 2037                  * We can never take an address that breaks the scope zone
 2038                  * of the destination.
 2039                  */
 2040                 if (ifp->if_afdata[AF_INET6] == NULL)
 2041                         continue;
 2042                 if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst))
 2043                         continue;
 2044 
 2045                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 2046                         int tlen = -1, dscopecmp, bscopecmp, matchcmp;
 2047                         struct ifaddr *ifa = ifac->ifa;
 2048 
 2049                         if (ifa->ifa_addr->sa_family != AF_INET6)
 2050                                 continue;
 2051 
 2052                         src_scope = in6_addrscope(IFA_IN6(ifa));
 2053 
 2054                         /*
 2055                          * Don't use an address before completing DAD
 2056                          * nor a duplicated address.
 2057                          */
 2058                         if (((struct in6_ifaddr *)ifa)->ia6_flags &
 2059                             IN6_IFF_NOTREADY)
 2060                                 continue;
 2061 
 2062                         /* XXX: is there any case to allow anycasts? */
 2063                         if (((struct in6_ifaddr *)ifa)->ia6_flags &
 2064                             IN6_IFF_ANYCAST)
 2065                                 continue;
 2066 
 2067                         if (((struct in6_ifaddr *)ifa)->ia6_flags &
 2068                             IN6_IFF_DETACHED)
 2069                                 continue;
 2070 
 2071                         /*
 2072                          * If this is the first address we find,
 2073                          * keep it anyway.
 2074                          */
 2075                         if (ifa_best == NULL)
 2076                                 goto replace;
 2077 
 2078                         /*
 2079                          * ifa_best is never NULL beyond this line except
 2080                          * within the block labeled "replace".
 2081                          */
 2082 
 2083                         /*
 2084                          * If ifa_best has a smaller scope than dst and
 2085                          * the current address has a larger one than
 2086                          * (or equal to) dst, always replace ifa_best.
 2087                          * Also, if the current address has a smaller scope
 2088                          * than dst, ignore it unless ifa_best also has a
 2089                          * smaller scope.
 2090                          * Consequently, after the two if-clause below,
 2091                          * the followings must be satisfied:
 2092                          * (scope(src) < scope(dst) &&
 2093                          *  scope(best) < scope(dst))
 2094                          *  OR
 2095                          * (scope(best) >= scope(dst) &&
 2096                          *  scope(src) >= scope(dst))
 2097                          */
 2098                         if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 &&
 2099                             IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0)
 2100                                 goto replace; /* (A) */
 2101                         if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 &&
 2102                             IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0)
 2103                                 continue; /* (B) */
 2104 
 2105                         /*
 2106                          * A deprecated address SHOULD NOT be used in new
 2107                          * communications if an alternate (non-deprecated)
 2108                          * address is available and has sufficient scope.
 2109                          * RFC 2462, Section 5.5.4.
 2110                          */
 2111                         if (((struct in6_ifaddr *)ifa)->ia6_flags &
 2112                             IN6_IFF_DEPRECATED) {
 2113                                 /*
 2114                                  * Ignore any deprecated addresses if
 2115                                  * specified by configuration.
 2116                                  */
 2117                                 if (!ip6_use_deprecated)
 2118                                         continue;
 2119 
 2120                                 /*
 2121                                  * If we have already found a non-deprecated
 2122                                  * candidate, just ignore deprecated addresses.
 2123                                  */
 2124                                 if (!(ifa_best->ia6_flags & IN6_IFF_DEPRECATED))
 2125                                         continue;
 2126                         }
 2127 
 2128                         /*
 2129                          * A non-deprecated address is always preferred
 2130                          * to a deprecated one regardless of scopes and
 2131                          * address matching (Note invariants ensured by the
 2132                          * conditions (A) and (B) above.)
 2133                          */
 2134                         if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) &&
 2135                             !(((struct in6_ifaddr *)ifa)->ia6_flags &
 2136                              IN6_IFF_DEPRECATED))
 2137                                 goto replace;
 2138 
 2139                         /*
 2140                          * When we use temporary addresses described in
 2141                          * RFC 3041, we prefer temporary addresses to
 2142                          * public autoconf addresses.  Again, note the
 2143                          * invariants from (A) and (B).  Also note that we
 2144                          * don't have any preference between static addresses
 2145                          * and autoconf addresses (despite of whether or not
 2146                          * the latter is temporary or public.)
 2147                          */
 2148                         if (ip6_use_tempaddr) {
 2149                                 struct in6_ifaddr *ifat;
 2150 
 2151                                 ifat = (struct in6_ifaddr *)ifa;
 2152                                 if ((ifa_best->ia6_flags &
 2153                                      (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
 2154                                      == IN6_IFF_AUTOCONF &&
 2155                                     (ifat->ia6_flags &
 2156                                      (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
 2157                                      == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) {
 2158                                         goto replace;
 2159                                 }
 2160                                 if ((ifa_best->ia6_flags &
 2161                                      (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
 2162                                     == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY) &&
 2163                                     (ifat->ia6_flags &
 2164                                      (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
 2165                                      == IN6_IFF_AUTOCONF) {
 2166                                         continue;
 2167                                 }
 2168                         }
 2169 
 2170                         /*
 2171                          * At this point, we have two cases:
 2172                          * 1. we are looking at a non-deprecated address,
 2173                          *    and ifa_best is also non-deprecated.
 2174                          * 2. we are looking at a deprecated address,
 2175                          *    and ifa_best is also deprecated.
 2176                          * Also, we do not have to consider a case where
 2177                          * the scope of if_best is larger(smaller) than dst and
 2178                          * the scope of the current address is smaller(larger)
 2179                          * than dst. Such a case has already been covered.
 2180                          * Tiebreaking is done according to the following
 2181                          * items:
 2182                          * - the scope comparison between the address and
 2183                          *   dst (dscopecmp)
 2184                          * - the scope comparison between the address and
 2185                          *   ifa_best (bscopecmp)
 2186                          * - if the address match dst longer than ifa_best
 2187                          *   (matchcmp)
 2188                          * - if the address is on the outgoing I/F (outI/F)
 2189                          *
 2190                          * Roughly speaking, the selection policy is
 2191                          * - the most important item is scope. The same scope
 2192                          *   is best. Then search for a larger scope.
 2193                          *   Smaller scopes are the last resort.
 2194                          * - A deprecated address is chosen only when we have
 2195                          *   no address that has an enough scope, but is
 2196                          *   prefered to any addresses of smaller scopes
 2197                          *   (this must be already done above.)
 2198                          * - addresses on the outgoing I/F are preferred to
 2199                          *   ones on other interfaces if none of above
 2200                          *   tiebreaks.  In the table below, the column "bI"
 2201                          *   means if the best_ifa is on the outgoing
 2202                          *   interface, and the column "sI" means if the ifa
 2203                          *   is on the outgoing interface.
 2204                          * - If there is no other reasons to choose one,
 2205                          *   longest address match against dst is considered.
 2206                          *
 2207                          * The precise decision table is as follows:
 2208                          * dscopecmp bscopecmp    match  bI oI | replace?
 2209                          *       N/A     equal      N/A   Y  N |   No (1)
 2210                          *       N/A     equal      N/A   N  Y |  Yes (2)
 2211                          *       N/A     equal   larger    N/A |  Yes (3)
 2212                          *       N/A     equal  !larger    N/A |   No (4)
 2213                          *    larger    larger      N/A    N/A |   No (5)
 2214                          *    larger   smaller      N/A    N/A |  Yes (6)
 2215                          *   smaller    larger      N/A    N/A |  Yes (7)
 2216                          *   smaller   smaller      N/A    N/A |   No (8)
 2217                          *     equal   smaller      N/A    N/A |  Yes (9)
 2218                          *     equal    larger       (already done at A above)
 2219                          */
 2220                         dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope);
 2221                         bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope);
 2222 
 2223                         if (bscopecmp == 0) {
 2224                                 struct ifnet *bifp = ifa_best->ia_ifp;
 2225 
 2226                                 if (bifp == oifp && ifp != oifp) /* (1) */
 2227                                         continue;
 2228                                 if (bifp != oifp && ifp == oifp) /* (2) */
 2229                                         goto replace;
 2230 
 2231                                 /*
 2232                                  * Both bifp and ifp are on the outgoing
 2233                                  * interface, or both two are on a different
 2234                                  * interface from the outgoing I/F.
 2235                                  * now we need address matching against dst
 2236                                  * for tiebreaking.
 2237                                  */
 2238                                 tlen = in6_matchlen(IFA_IN6(ifa), dst);
 2239                                 matchcmp = tlen - blen;
 2240                                 if (matchcmp > 0) /* (3) */
 2241                                         goto replace;
 2242                                 continue; /* (4) */
 2243                         }
 2244                         if (dscopecmp > 0) {
 2245                                 if (bscopecmp > 0) /* (5) */
 2246                                         continue;
 2247                                 goto replace; /* (6) */
 2248                         }
 2249                         if (dscopecmp < 0) {
 2250                                 if (bscopecmp > 0) /* (7) */
 2251                                         goto replace;
 2252                                 continue; /* (8) */
 2253                         }
 2254 
 2255                         /* now dscopecmp must be 0 */
 2256                         if (bscopecmp < 0)
 2257                                 goto replace; /* (9) */
 2258 
 2259 replace:
 2260                         ifa_best = (struct in6_ifaddr *)ifa;
 2261                         blen = tlen >= 0 ? tlen :
 2262                                 in6_matchlen(IFA_IN6(ifa), dst);
 2263                         best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr);
 2264                 }
 2265         }
 2266 
 2267         /* count statistics for future improvements */
 2268         if (ifa_best == NULL)
 2269                 ip6stat.ip6s_sources_none++;
 2270         else {
 2271                 if (oifp == ifa_best->ia_ifp)
 2272                         ip6stat.ip6s_sources_sameif[best_scope]++;
 2273                 else
 2274                         ip6stat.ip6s_sources_otherif[best_scope]++;
 2275 
 2276                 if (best_scope == dst_scope)
 2277                         ip6stat.ip6s_sources_samescope[best_scope]++;
 2278                 else
 2279                         ip6stat.ip6s_sources_otherscope[best_scope]++;
 2280 
 2281                 if (ifa_best->ia6_flags & IN6_IFF_DEPRECATED)
 2282                         ip6stat.ip6s_sources_deprecated[best_scope]++;
 2283         }
 2284 
 2285         return (ifa_best);
 2286 }
 2287 
 2288 /*
 2289  * return the best address out of the same scope. if no address was
 2290  * found, return the first valid address from designated IF.
 2291  */
 2292 struct in6_ifaddr *
 2293 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
 2294 {
 2295         int dst_scope = in6_addrscope(dst), blen = -1, tlen;
 2296         struct ifaddr_container *ifac;
 2297         struct in6_ifaddr *besta = NULL;
 2298         struct in6_ifaddr *dep[2];      /* last-resort: deprecated */
 2299 
 2300         dep[0] = dep[1] = NULL;
 2301 
 2302         /*
 2303          * We first look for addresses in the same scope.
 2304          * If there is one, return it.
 2305          * If two or more, return one which matches the dst longest.
 2306          * If none, return one of global addresses assigned other ifs.
 2307          */
 2308         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 2309                 struct ifaddr *ifa = ifac->ifa;
 2310 
 2311                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2312                         continue;
 2313                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 2314                         continue; /* XXX: is there any case to allow anycast? */
 2315                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 2316                         continue; /* don't use this interface */
 2317                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 2318                         continue;
 2319                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 2320                         if (ip6_use_deprecated)
 2321                                 dep[0] = (struct in6_ifaddr *)ifa;
 2322                         continue;
 2323                 }
 2324 
 2325                 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
 2326                         /*
 2327                          * call in6_matchlen() as few as possible
 2328                          */
 2329                         if (besta) {
 2330                                 if (blen == -1)
 2331                                         blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
 2332                                 tlen = in6_matchlen(IFA_IN6(ifa), dst);
 2333                                 if (tlen > blen) {
 2334                                         blen = tlen;
 2335                                         besta = (struct in6_ifaddr *)ifa;
 2336                                 }
 2337                         } else
 2338                                 besta = (struct in6_ifaddr *)ifa;
 2339                 }
 2340         }
 2341         if (besta)
 2342                 return (besta);
 2343 
 2344         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 2345                 struct ifaddr *ifa = ifac->ifa;
 2346 
 2347                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2348                         continue;
 2349                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 2350                         continue; /* XXX: is there any case to allow anycast? */
 2351                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 2352                         continue; /* don't use this interface */
 2353                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 2354                         continue;
 2355                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 2356                         if (ip6_use_deprecated)
 2357                                 dep[1] = (struct in6_ifaddr *)ifa;
 2358                         continue;
 2359                 }
 2360 
 2361                 return (struct in6_ifaddr *)ifa;
 2362         }
 2363 
 2364         /* use the last-resort values, that are, deprecated addresses */
 2365         if (dep[0])
 2366                 return dep[0];
 2367         if (dep[1])
 2368                 return dep[1];
 2369 
 2370         return NULL;
 2371 }
 2372 
 2373 /*
 2374  * perform DAD when interface becomes IFF_UP.
 2375  */
 2376 void
 2377 in6_if_up(struct ifnet *ifp)
 2378 {
 2379         struct ifaddr_container *ifac;
 2380         struct in6_ifaddr *ia;
 2381         int dad_delay;          /* delay ticks before DAD output */
 2382 
 2383         /*
 2384          * special cases, like 6to4, are handled in in6_ifattach
 2385          */
 2386         in6_ifattach(ifp, NULL);
 2387 
 2388         dad_delay = 0;
 2389         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 2390                 struct ifaddr *ifa = ifac->ifa;
 2391 
 2392                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2393                         continue;
 2394                 ia = (struct in6_ifaddr *)ifa;
 2395                 if (ia->ia6_flags & IN6_IFF_TENTATIVE)
 2396                         nd6_dad_start(ifa, &dad_delay);
 2397         }
 2398 }
 2399 
 2400 int
 2401 in6if_do_dad(struct ifnet *ifp)
 2402 {
 2403         if (ifp->if_flags & IFF_LOOPBACK)
 2404                 return (0);
 2405 
 2406         switch (ifp->if_type) {
 2407 #ifdef IFT_DUMMY
 2408         case IFT_DUMMY:
 2409 #endif
 2410         case IFT_FAITH:
 2411                 /*
 2412                  * These interfaces do not have the IFF_LOOPBACK flag,
 2413                  * but loop packets back.  We do not have to do DAD on such
 2414                  * interfaces.  We should even omit it, because loop-backed
 2415                  * NS would confuse the DAD procedure.
 2416                  */
 2417                 return (0);
 2418         default:
 2419                 /*
 2420                  * Our DAD routine requires the interface up and running.
 2421                  * However, some interfaces can be up before the RUNNING
 2422                  * status.  Additionaly, users may try to assign addresses
 2423                  * before the interface becomes up (or running).
 2424                  * We simply skip DAD in such a case as a work around.
 2425                  * XXX: we should rather mark "tentative" on such addresses,
 2426                  * and do DAD after the interface becomes ready.
 2427                  */
 2428                 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) !=
 2429                     (IFF_UP|IFF_RUNNING))
 2430                         return (0);
 2431 
 2432                 return (1);
 2433         }
 2434 }
 2435 
 2436 /*
 2437  * Calculate max IPv6 MTU through all the interfaces and store it
 2438  * to in6_maxmtu.
 2439  */
 2440 void
 2441 in6_setmaxmtu(void)
 2442 {
 2443         unsigned long maxmtu = 0;
 2444         struct ifnet *ifp;
 2445 
 2446         for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
 2447         {
 2448                 /* this function can be called during ifnet initialization */
 2449                 if (ifp->if_afdata[AF_INET6] == NULL)
 2450                         continue;
 2451                 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
 2452                     ND_IFINFO(ifp)->linkmtu > maxmtu)
 2453                         maxmtu =  ND_IFINFO(ifp)->linkmtu;
 2454         }
 2455         if (maxmtu)     /* update only when maxmtu is positive */
 2456                 in6_maxmtu = maxmtu;
 2457 }
 2458 
 2459 void *
 2460 in6_domifattach(struct ifnet *ifp)
 2461 {
 2462         struct in6_ifextra *ext;
 2463 
 2464         ext = (struct in6_ifextra *)kmalloc(sizeof(*ext), M_IFADDR, M_WAITOK);
 2465         bzero(ext, sizeof(*ext));
 2466 
 2467         ext->in6_ifstat = (struct in6_ifstat *)kmalloc(sizeof(struct in6_ifstat),
 2468                 M_IFADDR, M_WAITOK);
 2469         bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
 2470 
 2471         ext->icmp6_ifstat =
 2472                 (struct icmp6_ifstat *)kmalloc(sizeof(struct icmp6_ifstat),
 2473                         M_IFADDR, M_WAITOK);
 2474         bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
 2475 
 2476         ext->nd_ifinfo = nd6_ifattach(ifp);
 2477         ext->scope6_id = scope6_ifattach(ifp);
 2478         return ext;
 2479 }
 2480 
 2481 void
 2482 in6_domifdetach(struct ifnet *ifp, void *aux)
 2483 {
 2484         struct in6_ifextra *ext = (struct in6_ifextra *)aux;
 2485         scope6_ifdetach(ext->scope6_id);
 2486         nd6_ifdetach(ext->nd_ifinfo);
 2487         kfree(ext->in6_ifstat, M_IFADDR);
 2488         kfree(ext->icmp6_ifstat, M_IFADDR);
 2489         kfree(ext, M_IFADDR);
 2490 }
 2491 
 2492 /*
 2493  * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
 2494  * v4 mapped addr or v4 compat addr
 2495  */
 2496 void
 2497 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2498 {
 2499         bzero(sin, sizeof(*sin));
 2500         sin->sin_len = sizeof(struct sockaddr_in);
 2501         sin->sin_family = AF_INET;
 2502         sin->sin_port = sin6->sin6_port;
 2503         sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
 2504 }
 2505 
 2506 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
 2507 void
 2508 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2509 {
 2510         bzero(sin6, sizeof(*sin6));
 2511         sin6->sin6_len = sizeof(struct sockaddr_in6);
 2512         sin6->sin6_family = AF_INET6;
 2513         sin6->sin6_port = sin->sin_port;
 2514         sin6->sin6_addr.s6_addr32[0] = 0;
 2515         sin6->sin6_addr.s6_addr32[1] = 0;
 2516         sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
 2517         sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
 2518 }
 2519 
 2520 /* Convert sockaddr_in6 into sockaddr_in. */
 2521 void
 2522 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
 2523 {
 2524         struct sockaddr_in *sin_p;
 2525         struct sockaddr_in6 sin6;
 2526 
 2527         /*
 2528          * Save original sockaddr_in6 addr and convert it
 2529          * to sockaddr_in.
 2530          */
 2531         sin6 = *(struct sockaddr_in6 *)nam;
 2532         sin_p = (struct sockaddr_in *)nam;
 2533         in6_sin6_2_sin(sin_p, &sin6);
 2534 }
 2535 
 2536 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
 2537 void
 2538 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
 2539 {
 2540         struct sockaddr_in *sin_p;
 2541         struct sockaddr_in6 *sin6_p;
 2542 
 2543         sin6_p = kmalloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
 2544         sin_p = (struct sockaddr_in *)*nam;
 2545         in6_sin_2_v4mapsin6(sin_p, sin6_p);
 2546         kfree(*nam, M_SONAME);
 2547         *nam = (struct sockaddr *)sin6_p;
 2548 }

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