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

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
   30  */
   31 
   32 /*-
   33  * Copyright (c) 1982, 1986, 1991, 1993
   34  *      The Regents of the University of California.  All rights reserved.
   35  *
   36  * Redistribution and use in source and binary forms, with or without
   37  * modification, are permitted provided that the following conditions
   38  * are met:
   39  * 1. Redistributions of source code must retain the above copyright
   40  *    notice, this list of conditions and the following disclaimer.
   41  * 2. Redistributions in binary form must reproduce the above copyright
   42  *    notice, this list of conditions and the following disclaimer in the
   43  *    documentation and/or other materials provided with the distribution.
   44  * 4. Neither the name of the University nor the names of its contributors
   45  *    may be used to endorse or promote products derived from this software
   46  *    without specific prior written permission.
   47  *
   48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   58  * SUCH DAMAGE.
   59  *
   60  *      @(#)in.c        8.2 (Berkeley) 11/15/93
   61  */
   62 
   63 #include <sys/cdefs.h>
   64 __FBSDID("$FreeBSD: releng/7.3/sys/netinet6/in6.c 193893 2009-06-10 10:31:11Z cperciva $");
   65 
   66 #include "opt_inet.h"
   67 #include "opt_inet6.h"
   68 
   69 #include <sys/param.h>
   70 #include <sys/errno.h>
   71 #include <sys/jail.h>
   72 #include <sys/malloc.h>
   73 #include <sys/socket.h>
   74 #include <sys/socketvar.h>
   75 #include <sys/sockio.h>
   76 #include <sys/systm.h>
   77 #include <sys/priv.h>
   78 #include <sys/proc.h>
   79 #include <sys/time.h>
   80 #include <sys/kernel.h>
   81 #include <sys/syslog.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 
  104 MALLOC_DEFINE(M_IP6MADDR, "in6_multi", "internet multicast address");
  105 
  106 /*
  107  * Definitions of some costant IP6 addresses.
  108  */
  109 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
  110 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
  111 const struct in6_addr in6addr_nodelocal_allnodes =
  112         IN6ADDR_NODELOCAL_ALLNODES_INIT;
  113 const struct in6_addr in6addr_linklocal_allnodes =
  114         IN6ADDR_LINKLOCAL_ALLNODES_INIT;
  115 const struct in6_addr in6addr_linklocal_allrouters =
  116         IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
  117 
  118 const struct in6_addr in6mask0 = IN6MASK0;
  119 const struct in6_addr in6mask32 = IN6MASK32;
  120 const struct in6_addr in6mask64 = IN6MASK64;
  121 const struct in6_addr in6mask96 = IN6MASK96;
  122 const struct in6_addr in6mask128 = IN6MASK128;
  123 
  124 const struct sockaddr_in6 sa6_any =
  125         { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
  126 
  127 static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
  128         struct ifnet *, struct thread *));
  129 static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *,
  130         struct sockaddr_in6 *, int));
  131 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
  132 
  133 struct in6_multihead in6_multihead;     /* XXX BSS initialization */
  134 int     (*faithprefix_p)(struct in6_addr *);
  135 
  136 /*
  137  * Subroutine for in6_ifaddloop() and in6_ifremloop().
  138  * This routine does actual work.
  139  */
  140 static void
  141 in6_ifloop_request(int cmd, struct ifaddr *ifa)
  142 {
  143         struct sockaddr_in6 all1_sa;
  144         struct rtentry *nrt = NULL;
  145         int e;
  146         char ip6buf[INET6_ADDRSTRLEN];
  147 
  148         bzero(&all1_sa, sizeof(all1_sa));
  149         all1_sa.sin6_family = AF_INET6;
  150         all1_sa.sin6_len = sizeof(struct sockaddr_in6);
  151         all1_sa.sin6_addr = in6mask128;
  152 
  153         /*
  154          * We specify the address itself as the gateway, and set the
  155          * RTF_LLINFO flag, so that the corresponding host route would have
  156          * the flag, and thus applications that assume traditional behavior
  157          * would be happy.  Note that we assume the caller of the function
  158          * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest,
  159          * which changes the outgoing interface to the loopback interface.
  160          */
  161         e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr,
  162             (struct sockaddr *)&all1_sa, RTF_UP|RTF_HOST|RTF_LLINFO, &nrt);
  163         if (e != 0) {
  164                 /* XXX need more descriptive message */
  165 
  166                 log(LOG_ERR, "in6_ifloop_request: "
  167                     "%s operation failed for %s (errno=%d)\n",
  168                     cmd == RTM_ADD ? "ADD" : "DELETE",
  169                     ip6_sprintf(ip6buf,
  170                             &((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), e);
  171         }
  172 
  173         /*
  174          * Report the addition/removal of the address to the routing socket.
  175          * XXX: since we called rtinit for a p2p interface with a destination,
  176          *      we end up reporting twice in such a case.  Should we rather
  177          *      omit the second report?
  178          */
  179         if (nrt) {
  180                 RT_LOCK(nrt);
  181                 /*
  182                  * Make sure rt_ifa be equal to IFA, the second argument of
  183                  * the function.  We need this because when we refer to
  184                  * rt_ifa->ia6_flags in ip6_input, we assume that the rt_ifa
  185                  * points to the address instead of the loopback address.
  186                  */
  187                 if (cmd == RTM_ADD && ifa != nrt->rt_ifa) {
  188                         IFAFREE(nrt->rt_ifa);
  189                         IFAREF(ifa);
  190                         nrt->rt_ifa = ifa;
  191                 }
  192 
  193                 rt_newaddrmsg(cmd, ifa, e, nrt);
  194                 if (cmd == RTM_DELETE)
  195                         RTFREE_LOCKED(nrt);
  196                 else {
  197                         /* the cmd must be RTM_ADD here */
  198                         RT_REMREF(nrt);
  199                         RT_UNLOCK(nrt);
  200                 }
  201         }
  202 }
  203 
  204 /*
  205  * Add ownaddr as loopback rtentry.  We previously add the route only if
  206  * necessary (ex. on a p2p link).  However, since we now manage addresses
  207  * separately from prefixes, we should always add the route.  We can't
  208  * rely on the cloning mechanism from the corresponding interface route
  209  * any more.
  210  */
  211 void
  212 in6_ifaddloop(struct ifaddr *ifa)
  213 {
  214         struct rtentry *rt;
  215         int need_loop;
  216 
  217         /* If there is no loopback entry, allocate one. */
  218         rt = rtalloc1(ifa->ifa_addr, 0, 0);
  219         need_loop = (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 ||
  220             (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0);
  221         if (rt)
  222                 RTFREE_LOCKED(rt);
  223         if (need_loop)
  224                 in6_ifloop_request(RTM_ADD, ifa);
  225 }
  226 
  227 /*
  228  * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(),
  229  * if it exists.
  230  */
  231 void
  232 in6_ifremloop(struct ifaddr *ifa)
  233 {
  234         struct in6_ifaddr *ia;
  235         struct rtentry *rt;
  236         int ia_count = 0;
  237 
  238         /*
  239          * Some of BSD variants do not remove cloned routes
  240          * from an interface direct route, when removing the direct route
  241          * (see comments in net/net_osdep.h).  Even for variants that do remove
  242          * cloned routes, they could fail to remove the cloned routes when
  243          * we handle multple addresses that share a common prefix.
  244          * So, we should remove the route corresponding to the deleted address.
  245          */
  246 
  247         /*
  248          * Delete the entry only if exact one ifa exists.  More than one ifa
  249          * can exist if we assign a same single address to multiple
  250          * (probably p2p) interfaces.
  251          * XXX: we should avoid such a configuration in IPv6...
  252          */
  253         for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
  254                 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) {
  255                         ia_count++;
  256                         if (ia_count > 1)
  257                                 break;
  258                 }
  259         }
  260 
  261         if (ia_count == 1) {
  262                 /*
  263                  * Before deleting, check if a corresponding loopbacked host
  264                  * route surely exists.  With this check, we can avoid to
  265                  * delete an interface direct route whose destination is same
  266                  * as the address being removed.  This can happen when removing
  267                  * a subnet-router anycast address on an interface attahced
  268                  * to a shared medium.
  269                  */
  270                 rt = rtalloc1(ifa->ifa_addr, 0, 0);
  271                 if (rt != NULL) {
  272                         if ((rt->rt_flags & RTF_HOST) != 0 &&
  273                             (rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
  274                                 RTFREE_LOCKED(rt);
  275                                 in6_ifloop_request(RTM_DELETE, ifa);
  276                         } else
  277                                 RT_UNLOCK(rt);
  278                 }
  279         }
  280 }
  281 
  282 int
  283 in6_mask2len(struct in6_addr *mask, u_char *lim0)
  284 {
  285         int x = 0, y;
  286         u_char *lim = lim0, *p;
  287 
  288         /* ignore the scope_id part */
  289         if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
  290                 lim = (u_char *)mask + sizeof(*mask);
  291         for (p = (u_char *)mask; p < lim; x++, p++) {
  292                 if (*p != 0xff)
  293                         break;
  294         }
  295         y = 0;
  296         if (p < lim) {
  297                 for (y = 0; y < 8; y++) {
  298                         if ((*p & (0x80 >> y)) == 0)
  299                                 break;
  300                 }
  301         }
  302 
  303         /*
  304          * when the limit pointer is given, do a stricter check on the
  305          * remaining bits.
  306          */
  307         if (p < lim) {
  308                 if (y != 0 && (*p & (0x00ff >> y)) != 0)
  309                         return (-1);
  310                 for (p = p + 1; p < lim; p++)
  311                         if (*p != 0)
  312                                 return (-1);
  313         }
  314 
  315         return x * 8 + y;
  316 }
  317 
  318 #define ifa2ia6(ifa)    ((struct in6_ifaddr *)(ifa))
  319 #define ia62ifa(ia6)    (&((ia6)->ia_ifa))
  320 
  321 int
  322 in6_control(struct socket *so, u_long cmd, caddr_t data,
  323     struct ifnet *ifp, struct thread *td)
  324 {
  325         struct  in6_ifreq *ifr = (struct in6_ifreq *)data;
  326         struct  in6_ifaddr *ia = NULL;
  327         struct  in6_aliasreq *ifra = (struct in6_aliasreq *)data;
  328         struct sockaddr_in6 *sa6;
  329         int error;
  330 
  331         switch (cmd) {
  332         case SIOCGETSGCNT_IN6:
  333         case SIOCGETMIFCNT_IN6:
  334                 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
  335         }
  336 
  337         switch(cmd) {
  338         case SIOCAADDRCTL_POLICY:
  339         case SIOCDADDRCTL_POLICY:
  340                 if (td != NULL) {
  341                         error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
  342                         if (error)
  343                                 return (error);
  344                 }
  345                 return (in6_src_ioctl(cmd, data));
  346         }
  347 
  348         if (ifp == NULL)
  349                 return (EOPNOTSUPP);
  350 
  351         switch (cmd) {
  352         case SIOCSNDFLUSH_IN6:
  353         case SIOCSPFXFLUSH_IN6:
  354         case SIOCSRTRFLUSH_IN6:
  355         case SIOCSDEFIFACE_IN6:
  356         case SIOCSIFINFO_FLAGS:
  357         case SIOCSIFINFO_IN6:
  358                 if (td != NULL) {
  359                         error = priv_check(td, PRIV_NETINET_ND6);
  360                         if (error)
  361                                 return (error);
  362                 }
  363                 /* FALLTHROUGH */
  364         case OSIOCGIFINFO_IN6:
  365         case SIOCGIFINFO_IN6:
  366         case SIOCGDRLST_IN6:
  367         case SIOCGPRLST_IN6:
  368         case SIOCGNBRINFO_IN6:
  369         case SIOCGDEFIFACE_IN6:
  370                 return (nd6_ioctl(cmd, data, ifp));
  371         }
  372 
  373         switch (cmd) {
  374         case SIOCSIFPREFIX_IN6:
  375         case SIOCDIFPREFIX_IN6:
  376         case SIOCAIFPREFIX_IN6:
  377         case SIOCCIFPREFIX_IN6:
  378         case SIOCSGIFPREFIX_IN6:
  379         case SIOCGIFPREFIX_IN6:
  380                 log(LOG_NOTICE,
  381                     "prefix ioctls are now invalidated. "
  382                     "please use ifconfig.\n");
  383                 return (EOPNOTSUPP);
  384         }
  385 
  386         switch (cmd) {
  387         case SIOCSSCOPE6:
  388                 if (td != NULL) {
  389                         error = priv_check(td, PRIV_NETINET_SCOPE6);
  390                         if (error)
  391                                 return (error);
  392                 }
  393                 return (scope6_set(ifp,
  394                     (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
  395         case SIOCGSCOPE6:
  396                 return (scope6_get(ifp,
  397                     (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
  398         case SIOCGSCOPE6DEF:
  399                 return (scope6_get_default((struct scope6_id *)
  400                     ifr->ifr_ifru.ifru_scope_id));
  401         }
  402 
  403         switch (cmd) {
  404         case SIOCALIFADDR:
  405                 if (td != NULL) {
  406                         error = priv_check(td, PRIV_NET_ADDIFADDR);
  407                         if (error)
  408                                 return (error);
  409                 }
  410                 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
  411 
  412         case SIOCDLIFADDR:
  413                 if (td != NULL) {
  414                         error = priv_check(td, PRIV_NET_DELIFADDR);
  415                         if (error)
  416                                 return (error);
  417                 }
  418                 /* FALLTHROUGH */
  419         case SIOCGLIFADDR:
  420                 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
  421         }
  422 
  423         /*
  424          * Find address for this interface, if it exists.
  425          *
  426          * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
  427          * only, and used the first interface address as the target of other
  428          * operations (without checking ifra_addr).  This was because netinet
  429          * code/API assumed at most 1 interface address per interface.
  430          * Since IPv6 allows a node to assign multiple addresses
  431          * on a single interface, we almost always look and check the
  432          * presence of ifra_addr, and reject invalid ones here.
  433          * It also decreases duplicated code among SIOC*_IN6 operations.
  434          */
  435         switch (cmd) {
  436         case SIOCAIFADDR_IN6:
  437         case SIOCSIFPHYADDR_IN6:
  438                 sa6 = &ifra->ifra_addr;
  439                 break;
  440         case SIOCSIFADDR_IN6:
  441         case SIOCGIFADDR_IN6:
  442         case SIOCSIFDSTADDR_IN6:
  443         case SIOCSIFNETMASK_IN6:
  444         case SIOCGIFDSTADDR_IN6:
  445         case SIOCGIFNETMASK_IN6:
  446         case SIOCDIFADDR_IN6:
  447         case SIOCGIFPSRCADDR_IN6:
  448         case SIOCGIFPDSTADDR_IN6:
  449         case SIOCGIFAFLAG_IN6:
  450         case SIOCSNDFLUSH_IN6:
  451         case SIOCSPFXFLUSH_IN6:
  452         case SIOCSRTRFLUSH_IN6:
  453         case SIOCGIFALIFETIME_IN6:
  454         case SIOCSIFALIFETIME_IN6:
  455         case SIOCGIFSTAT_IN6:
  456         case SIOCGIFSTAT_ICMP6:
  457                 sa6 = &ifr->ifr_addr;
  458                 break;
  459         default:
  460                 sa6 = NULL;
  461                 break;
  462         }
  463         if (sa6 && sa6->sin6_family == AF_INET6) {
  464                 int error = 0;
  465 
  466                 if (sa6->sin6_scope_id != 0)
  467                         error = sa6_embedscope(sa6, 0);
  468                 else
  469                         error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
  470                 if (error != 0)
  471                         return (error);
  472                 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
  473                     &sa6->sin6_addr)) != 0)
  474                         return (error);
  475                 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
  476         } else
  477                 ia = NULL;
  478 
  479         switch (cmd) {
  480         case SIOCSIFADDR_IN6:
  481         case SIOCSIFDSTADDR_IN6:
  482         case SIOCSIFNETMASK_IN6:
  483                 /*
  484                  * Since IPv6 allows a node to assign multiple addresses
  485                  * on a single interface, SIOCSIFxxx ioctls are deprecated.
  486                  */
  487                 /* we decided to obsolete this command (20000704) */
  488                 return (EINVAL);
  489 
  490         case SIOCDIFADDR_IN6:
  491                 /*
  492                  * for IPv4, we look for existing in_ifaddr here to allow
  493                  * "ifconfig if0 delete" to remove the first IPv4 address on
  494                  * the interface.  For IPv6, as the spec allows multiple
  495                  * interface address from the day one, we consider "remove the
  496                  * first one" semantics to be not preferable.
  497                  */
  498                 if (ia == NULL)
  499                         return (EADDRNOTAVAIL);
  500                 /* FALLTHROUGH */
  501         case SIOCAIFADDR_IN6:
  502                 /*
  503                  * We always require users to specify a valid IPv6 address for
  504                  * the corresponding operation.
  505                  */
  506                 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
  507                     ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6))
  508                         return (EAFNOSUPPORT);
  509 
  510                 if (td != NULL) {
  511                         error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 
  512                             PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
  513                         if (error)
  514                                 return (error);
  515                 }
  516 
  517                 break;
  518 
  519         case SIOCGIFADDR_IN6:
  520                 /* This interface is basically deprecated. use SIOCGIFCONF. */
  521                 /* FALLTHROUGH */
  522         case SIOCGIFAFLAG_IN6:
  523         case SIOCGIFNETMASK_IN6:
  524         case SIOCGIFDSTADDR_IN6:
  525         case SIOCGIFALIFETIME_IN6:
  526                 /* must think again about its semantics */
  527                 if (ia == NULL)
  528                         return (EADDRNOTAVAIL);
  529                 break;
  530         case SIOCSIFALIFETIME_IN6:
  531             {
  532                 struct in6_addrlifetime *lt;
  533 
  534                 if (td != NULL) {
  535                         error = priv_check(td, PRIV_NETINET_ALIFETIME6);
  536                         if (error)
  537                                 return (error);
  538                 }
  539                 if (ia == NULL)
  540                         return (EADDRNOTAVAIL);
  541                 /* sanity for overflow - beware unsigned */
  542                 lt = &ifr->ifr_ifru.ifru_lifetime;
  543                 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
  544                     lt->ia6t_vltime + time_second < time_second) {
  545                         return EINVAL;
  546                 }
  547                 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
  548                     lt->ia6t_pltime + time_second < time_second) {
  549                         return EINVAL;
  550                 }
  551                 break;
  552             }
  553         }
  554 
  555         switch (cmd) {
  556 
  557         case SIOCGIFADDR_IN6:
  558                 ifr->ifr_addr = ia->ia_addr;
  559                 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
  560                         return (error);
  561                 break;
  562 
  563         case SIOCGIFDSTADDR_IN6:
  564                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
  565                         return (EINVAL);
  566                 /*
  567                  * XXX: should we check if ifa_dstaddr is NULL and return
  568                  * an error?
  569                  */
  570                 ifr->ifr_dstaddr = ia->ia_dstaddr;
  571                 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
  572                         return (error);
  573                 break;
  574 
  575         case SIOCGIFNETMASK_IN6:
  576                 ifr->ifr_addr = ia->ia_prefixmask;
  577                 break;
  578 
  579         case SIOCGIFAFLAG_IN6:
  580                 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
  581                 break;
  582 
  583         case SIOCGIFSTAT_IN6:
  584                 if (ifp == NULL)
  585                         return EINVAL;
  586                 bzero(&ifr->ifr_ifru.ifru_stat,
  587                     sizeof(ifr->ifr_ifru.ifru_stat));
  588                 ifr->ifr_ifru.ifru_stat =
  589                     *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
  590                 break;
  591 
  592         case SIOCGIFSTAT_ICMP6:
  593                 if (ifp == NULL)
  594                         return EINVAL;
  595                 bzero(&ifr->ifr_ifru.ifru_icmp6stat,
  596                     sizeof(ifr->ifr_ifru.ifru_icmp6stat));
  597                 ifr->ifr_ifru.ifru_icmp6stat =
  598                     *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
  599                 break;
  600 
  601         case SIOCGIFALIFETIME_IN6:
  602                 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
  603                 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  604                         time_t maxexpire;
  605                         struct in6_addrlifetime *retlt =
  606                             &ifr->ifr_ifru.ifru_lifetime;
  607 
  608                         /*
  609                          * XXX: adjust expiration time assuming time_t is
  610                          * signed.
  611                          */
  612                         maxexpire = (-1) &
  613                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
  614                         if (ia->ia6_lifetime.ia6t_vltime <
  615                             maxexpire - ia->ia6_updatetime) {
  616                                 retlt->ia6t_expire = ia->ia6_updatetime +
  617                                     ia->ia6_lifetime.ia6t_vltime;
  618                         } else
  619                                 retlt->ia6t_expire = maxexpire;
  620                 }
  621                 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  622                         time_t maxexpire;
  623                         struct in6_addrlifetime *retlt =
  624                             &ifr->ifr_ifru.ifru_lifetime;
  625 
  626                         /*
  627                          * XXX: adjust expiration time assuming time_t is
  628                          * signed.
  629                          */
  630                         maxexpire = (-1) &
  631                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
  632                         if (ia->ia6_lifetime.ia6t_pltime <
  633                             maxexpire - ia->ia6_updatetime) {
  634                                 retlt->ia6t_preferred = ia->ia6_updatetime +
  635                                     ia->ia6_lifetime.ia6t_pltime;
  636                         } else
  637                                 retlt->ia6t_preferred = maxexpire;
  638                 }
  639                 break;
  640 
  641         case SIOCSIFALIFETIME_IN6:
  642                 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
  643                 /* for sanity */
  644                 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  645                         ia->ia6_lifetime.ia6t_expire =
  646                                 time_second + ia->ia6_lifetime.ia6t_vltime;
  647                 } else
  648                         ia->ia6_lifetime.ia6t_expire = 0;
  649                 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  650                         ia->ia6_lifetime.ia6t_preferred =
  651                                 time_second + ia->ia6_lifetime.ia6t_pltime;
  652                 } else
  653                         ia->ia6_lifetime.ia6t_preferred = 0;
  654                 break;
  655 
  656         case SIOCAIFADDR_IN6:
  657         {
  658                 int i, error = 0;
  659                 struct nd_prefixctl pr0;
  660                 struct nd_prefix *pr;
  661 
  662                 /*
  663                  * first, make or update the interface address structure,
  664                  * and link it to the list.
  665                  */
  666                 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
  667                         return (error);
  668                 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
  669                     == NULL) {
  670                         /*
  671                          * this can happen when the user specify the 0 valid
  672                          * lifetime.
  673                          */
  674                         break;
  675                 }
  676 
  677                 /*
  678                  * then, make the prefix on-link on the interface.
  679                  * XXX: we'd rather create the prefix before the address, but
  680                  * we need at least one address to install the corresponding
  681                  * interface route, so we configure the address first.
  682                  */
  683 
  684                 /*
  685                  * convert mask to prefix length (prefixmask has already
  686                  * been validated in in6_update_ifa().
  687                  */
  688                 bzero(&pr0, sizeof(pr0));
  689                 pr0.ndpr_ifp = ifp;
  690                 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
  691                     NULL);
  692                 if (pr0.ndpr_plen == 128) {
  693                         break;  /* we don't need to install a host route. */
  694                 }
  695                 pr0.ndpr_prefix = ifra->ifra_addr;
  696                 /* apply the mask for safety. */
  697                 for (i = 0; i < 4; i++) {
  698                         pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
  699                             ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
  700                 }
  701                 /*
  702                  * XXX: since we don't have an API to set prefix (not address)
  703                  * lifetimes, we just use the same lifetimes as addresses.
  704                  * The (temporarily) installed lifetimes can be overridden by
  705                  * later advertised RAs (when accept_rtadv is non 0), which is
  706                  * an intended behavior.
  707                  */
  708                 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
  709                 pr0.ndpr_raf_auto =
  710                     ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
  711                 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
  712                 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
  713 
  714                 /* add the prefix if not yet. */
  715                 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
  716                         /*
  717                          * nd6_prelist_add will install the corresponding
  718                          * interface route.
  719                          */
  720                         if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
  721                                 return (error);
  722                         if (pr == NULL) {
  723                                 log(LOG_ERR, "nd6_prelist_add succeeded but "
  724                                     "no prefix\n");
  725                                 return (EINVAL); /* XXX panic here? */
  726                         }
  727                 }
  728 
  729                 /* relate the address to the prefix */
  730                 if (ia->ia6_ndpr == NULL) {
  731                         ia->ia6_ndpr = pr;
  732                         pr->ndpr_refcnt++;
  733 
  734                         /*
  735                          * If this is the first autoconf address from the
  736                          * prefix, create a temporary address as well
  737                          * (when required).
  738                          */
  739                         if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
  740                             ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
  741                                 int e;
  742                                 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
  743                                         log(LOG_NOTICE, "in6_control: failed "
  744                                             "to create a temporary address, "
  745                                             "errno=%d\n", e);
  746                                 }
  747                         }
  748                 }
  749 
  750                 /*
  751                  * this might affect the status of autoconfigured addresses,
  752                  * that is, this address might make other addresses detached.
  753                  */
  754                 pfxlist_onlink_check();
  755                 if (error == 0 && ia)
  756                         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  757                 break;
  758         }
  759 
  760         case SIOCDIFADDR_IN6:
  761         {
  762                 struct nd_prefix *pr;
  763 
  764                 /*
  765                  * If the address being deleted is the only one that owns
  766                  * the corresponding prefix, expire the prefix as well.
  767                  * XXX: theoretically, we don't have to worry about such
  768                  * relationship, since we separate the address management
  769                  * and the prefix management.  We do this, however, to provide
  770                  * as much backward compatibility as possible in terms of
  771                  * the ioctl operation.
  772                  * Note that in6_purgeaddr() will decrement ndpr_refcnt.
  773                  */
  774                 pr = ia->ia6_ndpr;
  775                 in6_purgeaddr(&ia->ia_ifa);
  776                 if (pr && pr->ndpr_refcnt == 0)
  777                         prelist_remove(pr);
  778                 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  779                 break;
  780         }
  781 
  782         default:
  783                 if (ifp == NULL || ifp->if_ioctl == 0)
  784                         return (EOPNOTSUPP);
  785                 return ((*ifp->if_ioctl)(ifp, cmd, data));
  786         }
  787 
  788         return (0);
  789 }
  790 
  791 /*
  792  * Update parameters of an IPv6 interface address.
  793  * If necessary, a new entry is created and linked into address chains.
  794  * This function is separated from in6_control().
  795  * XXX: should this be performed under splnet()?
  796  */
  797 int
  798 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
  799     struct in6_ifaddr *ia, int flags)
  800 {
  801         int error = 0, hostIsNew = 0, plen = -1;
  802         struct in6_ifaddr *oia;
  803         struct sockaddr_in6 dst6;
  804         struct in6_addrlifetime *lt;
  805         struct in6_multi_mship *imm;
  806         struct in6_multi *in6m_sol;
  807         struct rtentry *rt;
  808         int delay;
  809         char ip6buf[INET6_ADDRSTRLEN];
  810 
  811         /* Validate parameters */
  812         if (ifp == NULL || ifra == NULL) /* this maybe redundant */
  813                 return (EINVAL);
  814 
  815         /*
  816          * The destination address for a p2p link must have a family
  817          * of AF_UNSPEC or AF_INET6.
  818          */
  819         if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
  820             ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
  821             ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
  822                 return (EAFNOSUPPORT);
  823         /*
  824          * validate ifra_prefixmask.  don't check sin6_family, netmask
  825          * does not carry fields other than sin6_len.
  826          */
  827         if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
  828                 return (EINVAL);
  829         /*
  830          * Because the IPv6 address architecture is classless, we require
  831          * users to specify a (non 0) prefix length (mask) for a new address.
  832          * We also require the prefix (when specified) mask is valid, and thus
  833          * reject a non-consecutive mask.
  834          */
  835         if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
  836                 return (EINVAL);
  837         if (ifra->ifra_prefixmask.sin6_len != 0) {
  838                 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
  839                     (u_char *)&ifra->ifra_prefixmask +
  840                     ifra->ifra_prefixmask.sin6_len);
  841                 if (plen <= 0)
  842                         return (EINVAL);
  843         } else {
  844                 /*
  845                  * In this case, ia must not be NULL.  We just use its prefix
  846                  * length.
  847                  */
  848                 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
  849         }
  850         /*
  851          * If the destination address on a p2p interface is specified,
  852          * and the address is a scoped one, validate/set the scope
  853          * zone identifier.
  854          */
  855         dst6 = ifra->ifra_dstaddr;
  856         if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
  857             (dst6.sin6_family == AF_INET6)) {
  858                 struct in6_addr in6_tmp;
  859                 u_int32_t zoneid;
  860 
  861                 in6_tmp = dst6.sin6_addr;
  862                 if (in6_setscope(&in6_tmp, ifp, &zoneid))
  863                         return (EINVAL); /* XXX: should be impossible */
  864 
  865                 if (dst6.sin6_scope_id != 0) {
  866                         if (dst6.sin6_scope_id != zoneid)
  867                                 return (EINVAL);
  868                 } else          /* user omit to specify the ID. */
  869                         dst6.sin6_scope_id = zoneid;
  870 
  871                 /* convert into the internal form */
  872                 if (sa6_embedscope(&dst6, 0))
  873                         return (EINVAL); /* XXX: should be impossible */
  874         }
  875         /*
  876          * The destination address can be specified only for a p2p or a
  877          * loopback interface.  If specified, the corresponding prefix length
  878          * must be 128.
  879          */
  880         if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
  881                 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
  882                         /* XXX: noisy message */
  883                         nd6log((LOG_INFO, "in6_update_ifa: a destination can "
  884                             "be specified for a p2p or a loopback IF only\n"));
  885                         return (EINVAL);
  886                 }
  887                 if (plen != 128) {
  888                         nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
  889                             "be 128 when dstaddr is specified\n"));
  890                         return (EINVAL);
  891                 }
  892         }
  893         /* lifetime consistency check */
  894         lt = &ifra->ifra_lifetime;
  895         if (lt->ia6t_pltime > lt->ia6t_vltime)
  896                 return (EINVAL);
  897         if (lt->ia6t_vltime == 0) {
  898                 /*
  899                  * the following log might be noisy, but this is a typical
  900                  * configuration mistake or a tool's bug.
  901                  */
  902                 nd6log((LOG_INFO,
  903                     "in6_update_ifa: valid lifetime is 0 for %s\n",
  904                     ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
  905 
  906                 if (ia == NULL)
  907                         return (0); /* there's nothing to do */
  908         }
  909 
  910         /*
  911          * If this is a new address, allocate a new ifaddr and link it
  912          * into chains.
  913          */
  914         if (ia == NULL) {
  915                 hostIsNew = 1;
  916                 /*
  917                  * When in6_update_ifa() is called in a process of a received
  918                  * RA, it is called under an interrupt context.  So, we should
  919                  * call malloc with M_NOWAIT.
  920                  */
  921                 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
  922                     M_NOWAIT);
  923                 if (ia == NULL)
  924                         return (ENOBUFS);
  925                 bzero((caddr_t)ia, sizeof(*ia));
  926                 LIST_INIT(&ia->ia6_memberships);
  927                 /* Initialize the address and masks, and put time stamp */
  928                 IFA_LOCK_INIT(&ia->ia_ifa);
  929                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
  930                 ia->ia_addr.sin6_family = AF_INET6;
  931                 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
  932                 ia->ia6_createtime = time_second;
  933                 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
  934                         /*
  935                          * XXX: some functions expect that ifa_dstaddr is not
  936                          * NULL for p2p interfaces.
  937                          */
  938                         ia->ia_ifa.ifa_dstaddr =
  939                             (struct sockaddr *)&ia->ia_dstaddr;
  940                 } else {
  941                         ia->ia_ifa.ifa_dstaddr = NULL;
  942                 }
  943                 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
  944 
  945                 ia->ia_ifp = ifp;
  946                 if ((oia = in6_ifaddr) != NULL) {
  947                         for ( ; oia->ia_next; oia = oia->ia_next)
  948                                 continue;
  949                         oia->ia_next = ia;
  950                 } else
  951                         in6_ifaddr = ia;
  952 
  953                 ia->ia_ifa.ifa_refcnt = 1;
  954                 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
  955         }
  956 
  957         /* update timestamp */
  958         ia->ia6_updatetime = time_second;
  959 
  960         /* set prefix mask */
  961         if (ifra->ifra_prefixmask.sin6_len) {
  962                 /*
  963                  * We prohibit changing the prefix length of an existing
  964                  * address, because
  965                  * + such an operation should be rare in IPv6, and
  966                  * + the operation would confuse prefix management.
  967                  */
  968                 if (ia->ia_prefixmask.sin6_len &&
  969                     in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
  970                         nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
  971                             " existing (%s) address should not be changed\n",
  972                             ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
  973                         error = EINVAL;
  974                         goto unlink;
  975                 }
  976                 ia->ia_prefixmask = ifra->ifra_prefixmask;
  977         }
  978 
  979         /*
  980          * If a new destination address is specified, scrub the old one and
  981          * install the new destination.  Note that the interface must be
  982          * p2p or loopback (see the check above.)
  983          */
  984         if (dst6.sin6_family == AF_INET6 &&
  985             !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
  986                 int e;
  987 
  988                 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
  989                     (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
  990                         nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
  991                             "a route to the old destination: %s\n",
  992                             ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
  993                         /* proceed anyway... */
  994                 } else
  995                         ia->ia_flags &= ~IFA_ROUTE;
  996                 ia->ia_dstaddr = dst6;
  997         }
  998 
  999         /*
 1000          * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
 1001          * to see if the address is deprecated or invalidated, but initialize
 1002          * these members for applications.
 1003          */
 1004         ia->ia6_lifetime = ifra->ifra_lifetime;
 1005         if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
 1006                 ia->ia6_lifetime.ia6t_expire =
 1007                     time_second + ia->ia6_lifetime.ia6t_vltime;
 1008         } else
 1009                 ia->ia6_lifetime.ia6t_expire = 0;
 1010         if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
 1011                 ia->ia6_lifetime.ia6t_preferred =
 1012                     time_second + ia->ia6_lifetime.ia6t_pltime;
 1013         } else
 1014                 ia->ia6_lifetime.ia6t_preferred = 0;
 1015 
 1016         /* reset the interface and routing table appropriately. */
 1017         if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
 1018                 goto unlink;
 1019 
 1020         /*
 1021          * configure address flags.
 1022          */
 1023         ia->ia6_flags = ifra->ifra_flags;
 1024         /*
 1025          * backward compatibility - if IN6_IFF_DEPRECATED is set from the
 1026          * userland, make it deprecated.
 1027          */
 1028         if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
 1029                 ia->ia6_lifetime.ia6t_pltime = 0;
 1030                 ia->ia6_lifetime.ia6t_preferred = time_second;
 1031         }
 1032         /*
 1033          * Make the address tentative before joining multicast addresses,
 1034          * so that corresponding MLD responses would not have a tentative
 1035          * source address.
 1036          */
 1037         ia->ia6_flags &= ~IN6_IFF_DUPLICATED;   /* safety */
 1038         if (hostIsNew && in6if_do_dad(ifp))
 1039                 ia->ia6_flags |= IN6_IFF_TENTATIVE;
 1040 
 1041         /*
 1042          * We are done if we have simply modified an existing address.
 1043          */
 1044         if (!hostIsNew)
 1045                 return (error);
 1046 
 1047         /*
 1048          * Beyond this point, we should call in6_purgeaddr upon an error,
 1049          * not just go to unlink.
 1050          */
 1051 
 1052         /* Join necessary multicast groups */
 1053         in6m_sol = NULL;
 1054         if ((ifp->if_flags & IFF_MULTICAST) != 0) {
 1055                 struct sockaddr_in6 mltaddr, mltmask;
 1056                 struct in6_addr llsol;
 1057 
 1058                 /* join solicited multicast addr for new host id */
 1059                 bzero(&llsol, sizeof(struct in6_addr));
 1060                 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
 1061                 llsol.s6_addr32[1] = 0;
 1062                 llsol.s6_addr32[2] = htonl(1);
 1063                 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
 1064                 llsol.s6_addr8[12] = 0xff;
 1065                 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
 1066                         /* XXX: should not happen */
 1067                         log(LOG_ERR, "in6_update_ifa: "
 1068                             "in6_setscope failed\n");
 1069                         goto cleanup;
 1070                 }
 1071                 delay = 0;
 1072                 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
 1073                         /*
 1074                          * We need a random delay for DAD on the address
 1075                          * being configured.  It also means delaying
 1076                          * transmission of the corresponding MLD report to
 1077                          * avoid report collision.
 1078                          * [draft-ietf-ipv6-rfc2462bis-02.txt]
 1079                          */
 1080                         delay = arc4random() %
 1081                             (MAX_RTR_SOLICITATION_DELAY * hz);
 1082                 }
 1083                 imm = in6_joingroup(ifp, &llsol, &error, delay);
 1084                 if (imm == NULL) {
 1085                         nd6log((LOG_WARNING,
 1086                             "in6_update_ifa: addmulti failed for "
 1087                             "%s on %s (errno=%d)\n",
 1088                             ip6_sprintf(ip6buf, &llsol), if_name(ifp),
 1089                             error));
 1090                         in6_purgeaddr((struct ifaddr *)ia);
 1091                         return (error);
 1092                 }
 1093                 LIST_INSERT_HEAD(&ia->ia6_memberships,
 1094                     imm, i6mm_chain);
 1095                 in6m_sol = imm->i6mm_maddr;
 1096 
 1097                 bzero(&mltmask, sizeof(mltmask));
 1098                 mltmask.sin6_len = sizeof(struct sockaddr_in6);
 1099                 mltmask.sin6_family = AF_INET6;
 1100                 mltmask.sin6_addr = in6mask32;
 1101 #define MLTMASK_LEN  4  /* mltmask's masklen (=32bit=4octet) */
 1102 
 1103                 /*
 1104                  * join link-local all-nodes address
 1105                  */
 1106                 bzero(&mltaddr, sizeof(mltaddr));
 1107                 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
 1108                 mltaddr.sin6_family = AF_INET6;
 1109                 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
 1110                 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
 1111                     0)
 1112                         goto cleanup; /* XXX: should not fail */
 1113 
 1114                 /*
 1115                  * XXX: do we really need this automatic routes?
 1116                  * We should probably reconsider this stuff.  Most applications
 1117                  * actually do not need the routes, since they usually specify
 1118                  * the outgoing interface.
 1119                  */
 1120                 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
 1121                 if (rt) {
 1122                         if (memcmp(&mltaddr.sin6_addr,
 1123                             &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
 1124                             MLTMASK_LEN)) {
 1125                                 RTFREE_LOCKED(rt);
 1126                                 rt = NULL;
 1127                         }
 1128                 }
 1129                 if (!rt) {
 1130                         /* XXX: we need RTF_CLONING to fake nd6_rtrequest */
 1131                         error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
 1132                             (struct sockaddr *)&ia->ia_addr,
 1133                             (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
 1134                             (struct rtentry **)0);
 1135                         if (error)
 1136                                 goto cleanup;
 1137                 } else
 1138                         RTFREE_LOCKED(rt);
 1139 
 1140                 /*
 1141                  * XXX: do we really need this automatic routes?
 1142                  * We should probably reconsider this stuff.  Most applications
 1143                  * actually do not need the routes, since they usually specify
 1144                  * the outgoing interface.
 1145                  */
 1146                 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
 1147                 if (rt) {
 1148                         /* XXX: only works in !SCOPEDROUTING case. */
 1149                         if (memcmp(&mltaddr.sin6_addr,
 1150                             &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
 1151                             MLTMASK_LEN)) {
 1152                                 RTFREE_LOCKED(rt);
 1153                                 rt = NULL;
 1154                         }
 1155                 }
 1156                 if (!rt) {
 1157                         error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
 1158                             (struct sockaddr *)&ia->ia_addr,
 1159                             (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
 1160                             (struct rtentry **)0);
 1161                         if (error)
 1162                                 goto cleanup;
 1163                 } else {
 1164                         RTFREE_LOCKED(rt);
 1165                 }
 1166 
 1167                 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
 1168                 if (!imm) {
 1169                         nd6log((LOG_WARNING,
 1170                             "in6_update_ifa: addmulti failed for "
 1171                             "%s on %s (errno=%d)\n",
 1172                             ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
 1173                             if_name(ifp), error));
 1174                         goto cleanup;
 1175                 }
 1176                 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
 1177 
 1178                 /*
 1179                  * join node information group address
 1180                  */
 1181 #define hostnamelen     strlen(hostname)
 1182                 delay = 0;
 1183                 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
 1184                         /*
 1185                          * The spec doesn't say anything about delay for this
 1186                          * group, but the same logic should apply.
 1187                          */
 1188                         delay = arc4random() %
 1189                             (MAX_RTR_SOLICITATION_DELAY * hz);
 1190                 }
 1191                 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr)
 1192                     == 0) {
 1193                         imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error,
 1194                             delay); /* XXX jinmei */
 1195                         if (!imm) {
 1196                                 nd6log((LOG_WARNING, "in6_update_ifa: "
 1197                                     "addmulti failed for %s on %s "
 1198                                     "(errno=%d)\n",
 1199                                     ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
 1200                                     if_name(ifp), error));
 1201                                 /* XXX not very fatal, go on... */
 1202                         } else {
 1203                                 LIST_INSERT_HEAD(&ia->ia6_memberships,
 1204                                     imm, i6mm_chain);
 1205                         }
 1206                 }
 1207 #undef hostnamelen
 1208 
 1209                 /*
 1210                  * join interface-local all-nodes address.
 1211                  * (ff01::1%ifN, and ff01::%ifN/32)
 1212                  */
 1213                 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
 1214                 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL))
 1215                     != 0)
 1216                         goto cleanup; /* XXX: should not fail */
 1217                 /* XXX: again, do we really need the route? */
 1218                 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
 1219                 if (rt) {
 1220                         if (memcmp(&mltaddr.sin6_addr,
 1221                             &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
 1222                             MLTMASK_LEN)) {
 1223                                 RTFREE_LOCKED(rt);
 1224                                 rt = NULL;
 1225                         }
 1226                 }
 1227                 if (!rt) {
 1228                         error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
 1229                             (struct sockaddr *)&ia->ia_addr,
 1230                             (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
 1231                             (struct rtentry **)0);
 1232                         if (error)
 1233                                 goto cleanup;
 1234                 } else
 1235                         RTFREE_LOCKED(rt);
 1236 
 1237                 /* XXX: again, do we really need the route? */
 1238                 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
 1239                 if (rt) {
 1240                         if (memcmp(&mltaddr.sin6_addr,
 1241                             &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
 1242                             MLTMASK_LEN)) {
 1243                                 RTFREE_LOCKED(rt);
 1244                                 rt = NULL;
 1245                         }
 1246                 }
 1247                 if (!rt) {
 1248                         error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
 1249                             (struct sockaddr *)&ia->ia_addr,
 1250                             (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
 1251                             (struct rtentry **)0);
 1252                         if (error)
 1253                                 goto cleanup;
 1254                 } else {
 1255                         RTFREE_LOCKED(rt);
 1256                 }
 1257 
 1258                 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
 1259                 if (!imm) {
 1260                         nd6log((LOG_WARNING, "in6_update_ifa: "
 1261                             "addmulti failed for %s on %s "
 1262                             "(errno=%d)\n",
 1263                             ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
 1264                             if_name(ifp), error));
 1265                         goto cleanup;
 1266                 }
 1267                 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
 1268 #undef  MLTMASK_LEN
 1269         }
 1270 
 1271         /*
 1272          * Perform DAD, if needed.
 1273          * XXX It may be of use, if we can administratively
 1274          * disable DAD.
 1275          */
 1276         if (hostIsNew && in6if_do_dad(ifp) &&
 1277             ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
 1278             (ia->ia6_flags & IN6_IFF_TENTATIVE))
 1279         {
 1280                 int mindelay, maxdelay;
 1281 
 1282                 delay = 0;
 1283                 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
 1284                         /*
 1285                          * We need to impose a delay before sending an NS
 1286                          * for DAD.  Check if we also needed a delay for the
 1287                          * corresponding MLD message.  If we did, the delay
 1288                          * should be larger than the MLD delay (this could be
 1289                          * relaxed a bit, but this simple logic is at least
 1290                          * safe).
 1291                          */
 1292                         mindelay = 0;
 1293                         if (in6m_sol != NULL &&
 1294                             in6m_sol->in6m_state == MLD_REPORTPENDING) {
 1295                                 mindelay = in6m_sol->in6m_timer;
 1296                         }
 1297                         maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
 1298                         if (maxdelay - mindelay == 0)
 1299                                 delay = 0;
 1300                         else {
 1301                                 delay =
 1302                                     (arc4random() % (maxdelay - mindelay)) +
 1303                                     mindelay;
 1304                         }
 1305                 }
 1306                 nd6_dad_start((struct ifaddr *)ia, delay);
 1307         }
 1308 
 1309         return (error);
 1310 
 1311   unlink:
 1312         /*
 1313          * XXX: if a change of an existing address failed, keep the entry
 1314          * anyway.
 1315          */
 1316         if (hostIsNew)
 1317                 in6_unlink_ifa(ia, ifp);
 1318         return (error);
 1319 
 1320   cleanup:
 1321         in6_purgeaddr(&ia->ia_ifa);
 1322         return error;
 1323 }
 1324 
 1325 void
 1326 in6_purgeaddr(struct ifaddr *ifa)
 1327 {
 1328         struct ifnet *ifp = ifa->ifa_ifp;
 1329         struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
 1330         char ip6buf[INET6_ADDRSTRLEN];
 1331         struct in6_multi_mship *imm;
 1332 
 1333         /* stop DAD processing */
 1334         nd6_dad_stop(ifa);
 1335 
 1336         /*
 1337          * delete route to the destination of the address being purged.
 1338          * The interface must be p2p or loopback in this case.
 1339          */
 1340         if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) {
 1341                 int e;
 1342 
 1343                 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
 1344                     != 0) {
 1345                         log(LOG_ERR, "in6_purgeaddr: failed to remove "
 1346                             "a route to the p2p destination: %s on %s, "
 1347                             "errno=%d\n",
 1348                             ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
 1349                             if_name(ifp), e);
 1350                         /* proceed anyway... */
 1351                 } else
 1352                         ia->ia_flags &= ~IFA_ROUTE;
 1353         }
 1354 
 1355         /* Remove ownaddr's loopback rtentry, if it exists. */
 1356         in6_ifremloop(&(ia->ia_ifa));
 1357 
 1358         /*
 1359          * leave from multicast groups we have joined for the interface
 1360          */
 1361         while ((imm = ia->ia6_memberships.lh_first) != NULL) {
 1362                 LIST_REMOVE(imm, i6mm_chain);
 1363                 in6_leavegroup(imm);
 1364         }
 1365 
 1366         in6_unlink_ifa(ia, ifp);
 1367 }
 1368 
 1369 static void
 1370 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
 1371 {
 1372         struct in6_ifaddr *oia;
 1373         int     s = splnet();
 1374 
 1375         TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
 1376 
 1377         oia = ia;
 1378         if (oia == (ia = in6_ifaddr))
 1379                 in6_ifaddr = ia->ia_next;
 1380         else {
 1381                 while (ia->ia_next && (ia->ia_next != oia))
 1382                         ia = ia->ia_next;
 1383                 if (ia->ia_next)
 1384                         ia->ia_next = oia->ia_next;
 1385                 else {
 1386                         /* search failed */
 1387                         printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n");
 1388                 }
 1389         }
 1390 
 1391         /*
 1392          * Release the reference to the base prefix.  There should be a
 1393          * positive reference.
 1394          */
 1395         if (oia->ia6_ndpr == NULL) {
 1396                 nd6log((LOG_NOTICE,
 1397                     "in6_unlink_ifa: autoconf'ed address "
 1398                     "%p has no prefix\n", oia));
 1399         } else {
 1400                 oia->ia6_ndpr->ndpr_refcnt--;
 1401                 oia->ia6_ndpr = NULL;
 1402         }
 1403 
 1404         /*
 1405          * Also, if the address being removed is autoconf'ed, call
 1406          * pfxlist_onlink_check() since the release might affect the status of
 1407          * other (detached) addresses.
 1408          */
 1409         if ((oia->ia6_flags & IN6_IFF_AUTOCONF)) {
 1410                 pfxlist_onlink_check();
 1411         }
 1412 
 1413         /*
 1414          * release another refcnt for the link from in6_ifaddr.
 1415          * Note that we should decrement the refcnt at least once for all *BSD.
 1416          */
 1417         IFAFREE(&oia->ia_ifa);
 1418 
 1419         splx(s);
 1420 }
 1421 
 1422 void
 1423 in6_purgeif(struct ifnet *ifp)
 1424 {
 1425         struct ifaddr *ifa, *nifa;
 1426 
 1427         for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) {
 1428                 nifa = TAILQ_NEXT(ifa, ifa_list);
 1429                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1430                         continue;
 1431                 in6_purgeaddr(ifa);
 1432         }
 1433 
 1434         in6_ifdetach(ifp);
 1435 }
 1436 
 1437 /*
 1438  * SIOC[GAD]LIFADDR.
 1439  *      SIOCGLIFADDR: get first address. (?)
 1440  *      SIOCGLIFADDR with IFLR_PREFIX:
 1441  *              get first address that matches the specified prefix.
 1442  *      SIOCALIFADDR: add the specified address.
 1443  *      SIOCALIFADDR with IFLR_PREFIX:
 1444  *              add the specified prefix, filling hostid part from
 1445  *              the first link-local address.  prefixlen must be <= 64.
 1446  *      SIOCDLIFADDR: delete the specified address.
 1447  *      SIOCDLIFADDR with IFLR_PREFIX:
 1448  *              delete the first address that matches the specified prefix.
 1449  * return values:
 1450  *      EINVAL on invalid parameters
 1451  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 1452  *      other values may be returned from in6_ioctl()
 1453  *
 1454  * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
 1455  * this is to accomodate address naming scheme other than RFC2374,
 1456  * in the future.
 1457  * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
 1458  * address encoding scheme. (see figure on page 8)
 1459  */
 1460 static int
 1461 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
 1462     struct ifnet *ifp, struct thread *td)
 1463 {
 1464         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
 1465         struct ifaddr *ifa;
 1466         struct sockaddr *sa;
 1467 
 1468         /* sanity checks */
 1469         if (!data || !ifp) {
 1470                 panic("invalid argument to in6_lifaddr_ioctl");
 1471                 /* NOTREACHED */
 1472         }
 1473 
 1474         switch (cmd) {
 1475         case SIOCGLIFADDR:
 1476                 /* address must be specified on GET with IFLR_PREFIX */
 1477                 if ((iflr->flags & IFLR_PREFIX) == 0)
 1478                         break;
 1479                 /* FALLTHROUGH */
 1480         case SIOCALIFADDR:
 1481         case SIOCDLIFADDR:
 1482                 /* address must be specified on ADD and DELETE */
 1483                 sa = (struct sockaddr *)&iflr->addr;
 1484                 if (sa->sa_family != AF_INET6)
 1485                         return EINVAL;
 1486                 if (sa->sa_len != sizeof(struct sockaddr_in6))
 1487                         return EINVAL;
 1488                 /* XXX need improvement */
 1489                 sa = (struct sockaddr *)&iflr->dstaddr;
 1490                 if (sa->sa_family && sa->sa_family != AF_INET6)
 1491                         return EINVAL;
 1492                 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
 1493                         return EINVAL;
 1494                 break;
 1495         default: /* shouldn't happen */
 1496 #if 0
 1497                 panic("invalid cmd to in6_lifaddr_ioctl");
 1498                 /* NOTREACHED */
 1499 #else
 1500                 return EOPNOTSUPP;
 1501 #endif
 1502         }
 1503         if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
 1504                 return EINVAL;
 1505 
 1506         switch (cmd) {
 1507         case SIOCALIFADDR:
 1508             {
 1509                 struct in6_aliasreq ifra;
 1510                 struct in6_addr *hostid = NULL;
 1511                 int prefixlen;
 1512 
 1513                 if ((iflr->flags & IFLR_PREFIX) != 0) {
 1514                         struct sockaddr_in6 *sin6;
 1515 
 1516                         /*
 1517                          * hostid is to fill in the hostid part of the
 1518                          * address.  hostid points to the first link-local
 1519                          * address attached to the interface.
 1520                          */
 1521                         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
 1522                         if (!ifa)
 1523                                 return EADDRNOTAVAIL;
 1524                         hostid = IFA_IN6(ifa);
 1525 
 1526                         /* prefixlen must be <= 64. */
 1527                         if (64 < iflr->prefixlen)
 1528                                 return EINVAL;
 1529                         prefixlen = iflr->prefixlen;
 1530 
 1531                         /* hostid part must be zero. */
 1532                         sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1533                         if (sin6->sin6_addr.s6_addr32[2] != 0 ||
 1534                             sin6->sin6_addr.s6_addr32[3] != 0) {
 1535                                 return EINVAL;
 1536                         }
 1537                 } else
 1538                         prefixlen = iflr->prefixlen;
 1539 
 1540                 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
 1541                 bzero(&ifra, sizeof(ifra));
 1542                 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
 1543 
 1544                 bcopy(&iflr->addr, &ifra.ifra_addr,
 1545                     ((struct sockaddr *)&iflr->addr)->sa_len);
 1546                 if (hostid) {
 1547                         /* fill in hostid part */
 1548                         ifra.ifra_addr.sin6_addr.s6_addr32[2] =
 1549                             hostid->s6_addr32[2];
 1550                         ifra.ifra_addr.sin6_addr.s6_addr32[3] =
 1551                             hostid->s6_addr32[3];
 1552                 }
 1553 
 1554                 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
 1555                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
 1556                             ((struct sockaddr *)&iflr->dstaddr)->sa_len);
 1557                         if (hostid) {
 1558                                 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
 1559                                     hostid->s6_addr32[2];
 1560                                 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
 1561                                     hostid->s6_addr32[3];
 1562                         }
 1563                 }
 1564 
 1565                 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1566                 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
 1567 
 1568                 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
 1569                 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
 1570             }
 1571         case SIOCGLIFADDR:
 1572         case SIOCDLIFADDR:
 1573             {
 1574                 struct in6_ifaddr *ia;
 1575                 struct in6_addr mask, candidate, match;
 1576                 struct sockaddr_in6 *sin6;
 1577                 int cmp;
 1578 
 1579                 bzero(&mask, sizeof(mask));
 1580                 if (iflr->flags & IFLR_PREFIX) {
 1581                         /* lookup a prefix rather than address. */
 1582                         in6_prefixlen2mask(&mask, iflr->prefixlen);
 1583 
 1584                         sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1585                         bcopy(&sin6->sin6_addr, &match, sizeof(match));
 1586                         match.s6_addr32[0] &= mask.s6_addr32[0];
 1587                         match.s6_addr32[1] &= mask.s6_addr32[1];
 1588                         match.s6_addr32[2] &= mask.s6_addr32[2];
 1589                         match.s6_addr32[3] &= mask.s6_addr32[3];
 1590 
 1591                         /* if you set extra bits, that's wrong */
 1592                         if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
 1593                                 return EINVAL;
 1594 
 1595                         cmp = 1;
 1596                 } else {
 1597                         if (cmd == SIOCGLIFADDR) {
 1598                                 /* on getting an address, take the 1st match */
 1599                                 cmp = 0;        /* XXX */
 1600                         } else {
 1601                                 /* on deleting an address, do exact match */
 1602                                 in6_prefixlen2mask(&mask, 128);
 1603                                 sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1604                                 bcopy(&sin6->sin6_addr, &match, sizeof(match));
 1605 
 1606                                 cmp = 1;
 1607                         }
 1608                 }
 1609 
 1610                 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
 1611                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1612                                 continue;
 1613                         if (!cmp)
 1614                                 break;
 1615 
 1616                         /*
 1617                          * XXX: this is adhoc, but is necessary to allow
 1618                          * a user to specify fe80::/64 (not /10) for a
 1619                          * link-local address.
 1620                          */
 1621                         bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
 1622                         in6_clearscope(&candidate);
 1623                         candidate.s6_addr32[0] &= mask.s6_addr32[0];
 1624                         candidate.s6_addr32[1] &= mask.s6_addr32[1];
 1625                         candidate.s6_addr32[2] &= mask.s6_addr32[2];
 1626                         candidate.s6_addr32[3] &= mask.s6_addr32[3];
 1627                         if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
 1628                                 break;
 1629                 }
 1630                 if (!ifa)
 1631                         return EADDRNOTAVAIL;
 1632                 ia = ifa2ia6(ifa);
 1633 
 1634                 if (cmd == SIOCGLIFADDR) {
 1635                         int error;
 1636 
 1637                         /* fill in the if_laddrreq structure */
 1638                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
 1639                         error = sa6_recoverscope(
 1640                             (struct sockaddr_in6 *)&iflr->addr);
 1641                         if (error != 0)
 1642                                 return (error);
 1643 
 1644                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 1645                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 1646                                     ia->ia_dstaddr.sin6_len);
 1647                                 error = sa6_recoverscope(
 1648                                     (struct sockaddr_in6 *)&iflr->dstaddr);
 1649                                 if (error != 0)
 1650                                         return (error);
 1651                         } else
 1652                                 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
 1653 
 1654                         iflr->prefixlen =
 1655                             in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
 1656 
 1657                         iflr->flags = ia->ia6_flags;    /* XXX */
 1658 
 1659                         return 0;
 1660                 } else {
 1661                         struct in6_aliasreq ifra;
 1662 
 1663                         /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 1664                         bzero(&ifra, sizeof(ifra));
 1665                         bcopy(iflr->iflr_name, ifra.ifra_name,
 1666                             sizeof(ifra.ifra_name));
 1667 
 1668                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 1669                             ia->ia_addr.sin6_len);
 1670                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 1671                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 1672                                     ia->ia_dstaddr.sin6_len);
 1673                         } else {
 1674                                 bzero(&ifra.ifra_dstaddr,
 1675                                     sizeof(ifra.ifra_dstaddr));
 1676                         }
 1677                         bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
 1678                             ia->ia_prefixmask.sin6_len);
 1679 
 1680                         ifra.ifra_flags = ia->ia6_flags;
 1681                         return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
 1682                             ifp, td);
 1683                 }
 1684             }
 1685         }
 1686 
 1687         return EOPNOTSUPP;      /* just for safety */
 1688 }
 1689 
 1690 /*
 1691  * Initialize an interface's intetnet6 address
 1692  * and routing table entry.
 1693  */
 1694 static int
 1695 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
 1696     struct sockaddr_in6 *sin6, int newhost)
 1697 {
 1698         int     error = 0, plen, ifacount = 0;
 1699         int     s = splimp();
 1700         struct ifaddr *ifa;
 1701 
 1702         /*
 1703          * Give the interface a chance to initialize
 1704          * if this is its first address,
 1705          * and to validate the address if necessary.
 1706          */
 1707         TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
 1708                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1709                         continue;
 1710                 ifacount++;
 1711         }
 1712 
 1713         ia->ia_addr = *sin6;
 1714 
 1715         if (ifacount <= 1 && ifp->if_ioctl) {
 1716                 IFF_LOCKGIANT(ifp);
 1717                 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
 1718                 IFF_UNLOCKGIANT(ifp);
 1719                 if (error) {
 1720                         splx(s);
 1721                         return (error);
 1722                 }
 1723         }
 1724         splx(s);
 1725 
 1726         ia->ia_ifa.ifa_metric = ifp->if_metric;
 1727 
 1728         /* we could do in(6)_socktrim here, but just omit it at this moment. */
 1729 
 1730         if (newhost) {
 1731                 /*
 1732                  * set the rtrequest function to create llinfo.  It also
 1733                  * adjust outgoing interface of the route for the local
 1734                  * address when called via in6_ifaddloop() below.
 1735                  */
 1736                 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
 1737         }
 1738 
 1739         /*
 1740          * Special case:
 1741          * If a new destination address is specified for a point-to-point
 1742          * interface, install a route to the destination as an interface
 1743          * direct route.  In addition, if the link is expected to have neighbor
 1744          * cache entries, specify RTF_LLINFO so that a cache entry for the
 1745          * destination address will be created.
 1746          * created
 1747          * XXX: the logic below rejects assigning multiple addresses on a p2p
 1748          * interface that share the same destination.
 1749          */
 1750         plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
 1751         if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
 1752             ia->ia_dstaddr.sin6_family == AF_INET6) {
 1753                 int rtflags = RTF_UP | RTF_HOST;
 1754                 struct rtentry *rt = NULL, **rtp = NULL;
 1755 
 1756                 if (nd6_need_cache(ifp) != 0) {
 1757                         rtflags |= RTF_LLINFO;
 1758                         rtp = &rt;
 1759                 }
 1760 
 1761                 error = rtrequest(RTM_ADD,
 1762                     (struct sockaddr *)&ia->ia_dstaddr,
 1763                     (struct sockaddr *)&ia->ia_addr,
 1764                     (struct sockaddr *)&ia->ia_prefixmask,
 1765                     ia->ia_flags | rtflags, rtp);
 1766                 if (error != 0)
 1767                         return (error);
 1768                 if (rt != NULL) {
 1769                         struct llinfo_nd6 *ln;
 1770 
 1771                         RT_LOCK(rt);
 1772                         ln = (struct llinfo_nd6 *)rt->rt_llinfo;
 1773                         if (ln != NULL) {
 1774                                 /*
 1775                                  * Set the state to STALE because we don't
 1776                                  * have to perform address resolution on this
 1777                                  * link.
 1778                                  */
 1779                                 ln->ln_state = ND6_LLINFO_STALE;
 1780                         }
 1781                         RT_REMREF(rt);
 1782                         RT_UNLOCK(rt);
 1783                 }
 1784                 ia->ia_flags |= IFA_ROUTE;
 1785         }
 1786         if (plen < 128) {
 1787                 /*
 1788                  * The RTF_CLONING flag is necessary for in6_is_ifloop_auto().
 1789                  */
 1790                 ia->ia_ifa.ifa_flags |= RTF_CLONING;
 1791         }
 1792 
 1793         /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
 1794         if (newhost)
 1795                 in6_ifaddloop(&(ia->ia_ifa));
 1796 
 1797         return (error);
 1798 }
 1799 
 1800 struct in6_multi_mship *
 1801 in6_joingroup(struct ifnet *ifp, struct in6_addr *addr,
 1802     int *errorp, int delay)
 1803 {
 1804         struct in6_multi_mship *imm;
 1805 
 1806         imm = malloc(sizeof(*imm), M_IP6MADDR, M_NOWAIT);
 1807         if (!imm) {
 1808                 *errorp = ENOBUFS;
 1809                 return NULL;
 1810         }
 1811         imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp, delay);
 1812         if (!imm->i6mm_maddr) {
 1813                 /* *errorp is alrady set */
 1814                 free(imm, M_IP6MADDR);
 1815                 return NULL;
 1816         }
 1817         return imm;
 1818 }
 1819 
 1820 int
 1821 in6_leavegroup(struct in6_multi_mship *imm)
 1822 {
 1823 
 1824         if (imm->i6mm_maddr)
 1825                 in6_delmulti(imm->i6mm_maddr);
 1826         free(imm,  M_IP6MADDR);
 1827         return 0;
 1828 }
 1829 
 1830 /*
 1831  * Find an IPv6 interface link-local address specific to an interface.
 1832  */
 1833 struct in6_ifaddr *
 1834 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
 1835 {
 1836         struct ifaddr *ifa;
 1837 
 1838         TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
 1839                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1840                         continue;
 1841                 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
 1842                         if ((((struct in6_ifaddr *)ifa)->ia6_flags &
 1843                              ignoreflags) != 0)
 1844                                 continue;
 1845                         break;
 1846                 }
 1847         }
 1848 
 1849         return ((struct in6_ifaddr *)ifa);
 1850 }
 1851 
 1852 
 1853 /*
 1854  * find the internet address corresponding to a given interface and address.
 1855  */
 1856 struct in6_ifaddr *
 1857 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
 1858 {
 1859         struct ifaddr *ifa;
 1860 
 1861         TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
 1862                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1863                         continue;
 1864                 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
 1865                         break;
 1866         }
 1867 
 1868         return ((struct in6_ifaddr *)ifa);
 1869 }
 1870 
 1871 /*
 1872  * Convert IP6 address to printable (loggable) representation. Caller
 1873  * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
 1874  */
 1875 static char digits[] = "0123456789abcdef";
 1876 char *
 1877 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
 1878 {
 1879         int i;
 1880         char *cp;
 1881         const u_int16_t *a = (const u_int16_t *)addr;
 1882         const u_int8_t *d;
 1883         int dcolon = 0, zero = 0;
 1884 
 1885         cp = ip6buf;
 1886 
 1887         for (i = 0; i < 8; i++) {
 1888                 if (dcolon == 1) {
 1889                         if (*a == 0) {
 1890                                 if (i == 7)
 1891                                         *cp++ = ':';
 1892                                 a++;
 1893                                 continue;
 1894                         } else
 1895                                 dcolon = 2;
 1896                 }
 1897                 if (*a == 0) {
 1898                         if (dcolon == 0 && *(a + 1) == 0) {
 1899                                 if (i == 0)
 1900                                         *cp++ = ':';
 1901                                 *cp++ = ':';
 1902                                 dcolon = 1;
 1903                         } else {
 1904                                 *cp++ = '';
 1905                                 *cp++ = ':';
 1906                         }
 1907                         a++;
 1908                         continue;
 1909                 }
 1910                 d = (const u_char *)a;
 1911                 /* Try to eliminate leading zeros in printout like in :0001. */
 1912                 zero = 1;
 1913                 *cp = digits[*d >> 4];
 1914                 if (*cp != '') {
 1915                         zero = 0;
 1916                         cp++;
 1917                 }
 1918                 *cp = digits[*d++ & 0xf];
 1919                 if (zero == 0 || (*cp != '')) {
 1920                         zero = 0;
 1921                         cp++;
 1922                 }
 1923                 *cp = digits[*d >> 4];
 1924                 if (zero == 0 || (*cp != '')) {
 1925                         zero = 0;
 1926                         cp++;
 1927                 }
 1928                 *cp++ = digits[*d & 0xf];
 1929                 *cp++ = ':';
 1930                 a++;
 1931         }
 1932         *--cp = '\0';
 1933         return (ip6buf);
 1934 }
 1935 
 1936 int
 1937 in6_localaddr(struct in6_addr *in6)
 1938 {
 1939         struct in6_ifaddr *ia;
 1940 
 1941         if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
 1942                 return 1;
 1943 
 1944         for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
 1945                 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
 1946                     &ia->ia_prefixmask.sin6_addr)) {
 1947                         return 1;
 1948                 }
 1949         }
 1950 
 1951         return (0);
 1952 }
 1953 
 1954 int
 1955 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
 1956 {
 1957         struct in6_ifaddr *ia;
 1958 
 1959         for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
 1960                 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
 1961                                        &sa6->sin6_addr) &&
 1962                     (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0)
 1963                         return (1); /* true */
 1964 
 1965                 /* XXX: do we still have to go thru the rest of the list? */
 1966         }
 1967 
 1968         return (0);             /* false */
 1969 }
 1970 
 1971 /*
 1972  * return length of part which dst and src are equal
 1973  * hard coding...
 1974  */
 1975 int
 1976 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
 1977 {
 1978         int match = 0;
 1979         u_char *s = (u_char *)src, *d = (u_char *)dst;
 1980         u_char *lim = s + 16, r;
 1981 
 1982         while (s < lim)
 1983                 if ((r = (*d++ ^ *s++)) != 0) {
 1984                         while (r < 128) {
 1985                                 match++;
 1986                                 r <<= 1;
 1987                         }
 1988                         break;
 1989                 } else
 1990                         match += 8;
 1991         return match;
 1992 }
 1993 
 1994 /* XXX: to be scope conscious */
 1995 int
 1996 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
 1997 {
 1998         int bytelen, bitlen;
 1999 
 2000         /* sanity check */
 2001         if (0 > len || len > 128) {
 2002                 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
 2003                     len);
 2004                 return (0);
 2005         }
 2006 
 2007         bytelen = len / 8;
 2008         bitlen = len % 8;
 2009 
 2010         if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
 2011                 return (0);
 2012         if (bitlen != 0 &&
 2013             p1->s6_addr[bytelen] >> (8 - bitlen) !=
 2014             p2->s6_addr[bytelen] >> (8 - bitlen))
 2015                 return (0);
 2016 
 2017         return (1);
 2018 }
 2019 
 2020 void
 2021 in6_prefixlen2mask(struct in6_addr *maskp, int len)
 2022 {
 2023         u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
 2024         int bytelen, bitlen, i;
 2025 
 2026         /* sanity check */
 2027         if (0 > len || len > 128) {
 2028                 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
 2029                     len);
 2030                 return;
 2031         }
 2032 
 2033         bzero(maskp, sizeof(*maskp));
 2034         bytelen = len / 8;
 2035         bitlen = len % 8;
 2036         for (i = 0; i < bytelen; i++)
 2037                 maskp->s6_addr[i] = 0xff;
 2038         if (bitlen)
 2039                 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
 2040 }
 2041 
 2042 /*
 2043  * return the best address out of the same scope. if no address was
 2044  * found, return the first valid address from designated IF.
 2045  */
 2046 struct in6_ifaddr *
 2047 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
 2048 {
 2049         int dst_scope = in6_addrscope(dst), blen = -1, tlen;
 2050         struct ifaddr *ifa;
 2051         struct in6_ifaddr *besta = 0;
 2052         struct in6_ifaddr *dep[2];      /* last-resort: deprecated */
 2053 
 2054         dep[0] = dep[1] = NULL;
 2055 
 2056         /*
 2057          * We first look for addresses in the same scope.
 2058          * If there is one, return it.
 2059          * If two or more, return one which matches the dst longest.
 2060          * If none, return one of global addresses assigned other ifs.
 2061          */
 2062         TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
 2063                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2064                         continue;
 2065                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 2066                         continue; /* XXX: is there any case to allow anycast? */
 2067                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 2068                         continue; /* don't use this interface */
 2069                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 2070                         continue;
 2071                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 2072                         if (ip6_use_deprecated)
 2073                                 dep[0] = (struct in6_ifaddr *)ifa;
 2074                         continue;
 2075                 }
 2076 
 2077                 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
 2078                         /*
 2079                          * call in6_matchlen() as few as possible
 2080                          */
 2081                         if (besta) {
 2082                                 if (blen == -1)
 2083                                         blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
 2084                                 tlen = in6_matchlen(IFA_IN6(ifa), dst);
 2085                                 if (tlen > blen) {
 2086                                         blen = tlen;
 2087                                         besta = (struct in6_ifaddr *)ifa;
 2088                                 }
 2089                         } else
 2090                                 besta = (struct in6_ifaddr *)ifa;
 2091                 }
 2092         }
 2093         if (besta)
 2094                 return (besta);
 2095 
 2096         TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
 2097                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2098                         continue;
 2099                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 2100                         continue; /* XXX: is there any case to allow anycast? */
 2101                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 2102                         continue; /* don't use this interface */
 2103                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 2104                         continue;
 2105                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 2106                         if (ip6_use_deprecated)
 2107                                 dep[1] = (struct in6_ifaddr *)ifa;
 2108                         continue;
 2109                 }
 2110 
 2111                 return (struct in6_ifaddr *)ifa;
 2112         }
 2113 
 2114         /* use the last-resort values, that are, deprecated addresses */
 2115         if (dep[0])
 2116                 return dep[0];
 2117         if (dep[1])
 2118                 return dep[1];
 2119 
 2120         return NULL;
 2121 }
 2122 
 2123 /*
 2124  * perform DAD when interface becomes IFF_UP.
 2125  */
 2126 void
 2127 in6_if_up(struct ifnet *ifp)
 2128 {
 2129         struct ifaddr *ifa;
 2130         struct in6_ifaddr *ia;
 2131 
 2132         TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
 2133                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2134                         continue;
 2135                 ia = (struct in6_ifaddr *)ifa;
 2136                 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
 2137                         /*
 2138                          * The TENTATIVE flag was likely set by hand
 2139                          * beforehand, implicitly indicating the need for DAD.
 2140                          * We may be able to skip the random delay in this
 2141                          * case, but we impose delays just in case.
 2142                          */
 2143                         nd6_dad_start(ifa,
 2144                             arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
 2145                 }
 2146         }
 2147 
 2148         /*
 2149          * special cases, like 6to4, are handled in in6_ifattach
 2150          */
 2151         in6_ifattach(ifp, NULL);
 2152 }
 2153 
 2154 int
 2155 in6if_do_dad(struct ifnet *ifp)
 2156 {
 2157         if ((ifp->if_flags & IFF_LOOPBACK) != 0)
 2158                 return (0);
 2159 
 2160         switch (ifp->if_type) {
 2161 #ifdef IFT_DUMMY
 2162         case IFT_DUMMY:
 2163 #endif
 2164         case IFT_FAITH:
 2165                 /*
 2166                  * These interfaces do not have the IFF_LOOPBACK flag,
 2167                  * but loop packets back.  We do not have to do DAD on such
 2168                  * interfaces.  We should even omit it, because loop-backed
 2169                  * NS would confuse the DAD procedure.
 2170                  */
 2171                 return (0);
 2172         default:
 2173                 /*
 2174                  * Our DAD routine requires the interface up and running.
 2175                  * However, some interfaces can be up before the RUNNING
 2176                  * status.  Additionaly, users may try to assign addresses
 2177                  * before the interface becomes up (or running).
 2178                  * We simply skip DAD in such a case as a work around.
 2179                  * XXX: we should rather mark "tentative" on such addresses,
 2180                  * and do DAD after the interface becomes ready.
 2181                  */
 2182                 if (!((ifp->if_flags & IFF_UP) &&
 2183                     (ifp->if_drv_flags & IFF_DRV_RUNNING)))
 2184                         return (0);
 2185 
 2186                 return (1);
 2187         }
 2188 }
 2189 
 2190 /*
 2191  * Calculate max IPv6 MTU through all the interfaces and store it
 2192  * to in6_maxmtu.
 2193  */
 2194 void
 2195 in6_setmaxmtu(void)
 2196 {
 2197         unsigned long maxmtu = 0;
 2198         struct ifnet *ifp;
 2199 
 2200         IFNET_RLOCK();
 2201         for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
 2202                 /* this function can be called during ifnet initialization */
 2203                 if (!ifp->if_afdata[AF_INET6])
 2204                         continue;
 2205                 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
 2206                     IN6_LINKMTU(ifp) > maxmtu)
 2207                         maxmtu = IN6_LINKMTU(ifp);
 2208         }
 2209         IFNET_RUNLOCK();
 2210         if (maxmtu)          /* update only when maxmtu is positive */
 2211                 in6_maxmtu = maxmtu;
 2212 }
 2213 
 2214 /*
 2215  * Provide the length of interface identifiers to be used for the link attached
 2216  * to the given interface.  The length should be defined in "IPv6 over
 2217  * xxx-link" document.  Note that address architecture might also define
 2218  * the length for a particular set of address prefixes, regardless of the
 2219  * link type.  As clarified in rfc2462bis, those two definitions should be
 2220  * consistent, and those really are as of August 2004.
 2221  */
 2222 int
 2223 in6_if2idlen(struct ifnet *ifp)
 2224 {
 2225         switch (ifp->if_type) {
 2226         case IFT_ETHER:         /* RFC2464 */
 2227 #ifdef IFT_PROPVIRTUAL
 2228         case IFT_PROPVIRTUAL:   /* XXX: no RFC. treat it as ether */
 2229 #endif
 2230 #ifdef IFT_L2VLAN
 2231         case IFT_L2VLAN:        /* ditto */
 2232 #endif
 2233 #ifdef IFT_IEEE80211
 2234         case IFT_IEEE80211:     /* ditto */
 2235 #endif
 2236 #ifdef IFT_MIP
 2237         case IFT_MIP:   /* ditto */
 2238 #endif
 2239                 return (64);
 2240         case IFT_FDDI:          /* RFC2467 */
 2241                 return (64);
 2242         case IFT_ISO88025:      /* RFC2470 (IPv6 over Token Ring) */
 2243                 return (64);
 2244         case IFT_PPP:           /* RFC2472 */
 2245                 return (64);
 2246         case IFT_ARCNET:        /* RFC2497 */
 2247                 return (64);
 2248         case IFT_FRELAY:        /* RFC2590 */
 2249                 return (64);
 2250         case IFT_IEEE1394:      /* RFC3146 */
 2251                 return (64);
 2252         case IFT_GIF:
 2253                 return (64);    /* draft-ietf-v6ops-mech-v2-07 */
 2254         case IFT_LOOP:
 2255                 return (64);    /* XXX: is this really correct? */
 2256         default:
 2257                 /*
 2258                  * Unknown link type:
 2259                  * It might be controversial to use the today's common constant
 2260                  * of 64 for these cases unconditionally.  For full compliance,
 2261                  * we should return an error in this case.  On the other hand,
 2262                  * if we simply miss the standard for the link type or a new
 2263                  * standard is defined for a new link type, the IFID length
 2264                  * is very likely to be the common constant.  As a compromise,
 2265                  * we always use the constant, but make an explicit notice
 2266                  * indicating the "unknown" case.
 2267                  */
 2268                 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
 2269                 return (64);
 2270         }
 2271 }
 2272 
 2273 void *
 2274 in6_domifattach(struct ifnet *ifp)
 2275 {
 2276         struct in6_ifextra *ext;
 2277 
 2278         ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
 2279         bzero(ext, sizeof(*ext));
 2280 
 2281         ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
 2282             M_IFADDR, M_WAITOK);
 2283         bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
 2284 
 2285         ext->icmp6_ifstat =
 2286             (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
 2287             M_IFADDR, M_WAITOK);
 2288         bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
 2289 
 2290         ext->nd_ifinfo = nd6_ifattach(ifp);
 2291         ext->scope6_id = scope6_ifattach(ifp);
 2292         return ext;
 2293 }
 2294 
 2295 void
 2296 in6_domifdetach(struct ifnet *ifp, void *aux)
 2297 {
 2298         struct in6_ifextra *ext = (struct in6_ifextra *)aux;
 2299 
 2300         scope6_ifdetach(ext->scope6_id);
 2301         nd6_ifdetach(ext->nd_ifinfo);
 2302         free(ext->in6_ifstat, M_IFADDR);
 2303         free(ext->icmp6_ifstat, M_IFADDR);
 2304         free(ext, M_IFADDR);
 2305 }
 2306 
 2307 /*
 2308  * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
 2309  * v4 mapped addr or v4 compat addr
 2310  */
 2311 void
 2312 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2313 {
 2314 
 2315         bzero(sin, sizeof(*sin));
 2316         sin->sin_len = sizeof(struct sockaddr_in);
 2317         sin->sin_family = AF_INET;
 2318         sin->sin_port = sin6->sin6_port;
 2319         sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
 2320 }
 2321 
 2322 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
 2323 void
 2324 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2325 {
 2326         bzero(sin6, sizeof(*sin6));
 2327         sin6->sin6_len = sizeof(struct sockaddr_in6);
 2328         sin6->sin6_family = AF_INET6;
 2329         sin6->sin6_port = sin->sin_port;
 2330         sin6->sin6_addr.s6_addr32[0] = 0;
 2331         sin6->sin6_addr.s6_addr32[1] = 0;
 2332         sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
 2333         sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
 2334 }
 2335 
 2336 /* Convert sockaddr_in6 into sockaddr_in. */
 2337 void
 2338 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
 2339 {
 2340         struct sockaddr_in *sin_p;
 2341         struct sockaddr_in6 sin6;
 2342 
 2343         /*
 2344          * Save original sockaddr_in6 addr and convert it
 2345          * to sockaddr_in.
 2346          */
 2347         sin6 = *(struct sockaddr_in6 *)nam;
 2348         sin_p = (struct sockaddr_in *)nam;
 2349         in6_sin6_2_sin(sin_p, &sin6);
 2350 }
 2351 
 2352 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
 2353 void
 2354 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
 2355 {
 2356         struct sockaddr_in *sin_p;
 2357         struct sockaddr_in6 *sin6_p;
 2358 
 2359         MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
 2360                M_WAITOK);
 2361         sin_p = (struct sockaddr_in *)*nam;
 2362         in6_sin_2_v4mapsin6(sin_p, sin6_p);
 2363         FREE(*nam, M_SONAME);
 2364         *nam = (struct sockaddr *)sin6_p;
 2365 }

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