The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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/9.1/sys/netinet6/in6.c 255448 2013-09-10 10:15:33Z des $");
   65 
   66 #include "opt_compat.h"
   67 #include "opt_inet.h"
   68 #include "opt_inet6.h"
   69 
   70 #include <sys/param.h>
   71 #include <sys/errno.h>
   72 #include <sys/jail.h>
   73 #include <sys/malloc.h>
   74 #include <sys/socket.h>
   75 #include <sys/socketvar.h>
   76 #include <sys/sockio.h>
   77 #include <sys/systm.h>
   78 #include <sys/priv.h>
   79 #include <sys/proc.h>
   80 #include <sys/time.h>
   81 #include <sys/kernel.h>
   82 #include <sys/syslog.h>
   83 
   84 #include <net/if.h>
   85 #include <net/if_var.h>
   86 #include <net/if_types.h>
   87 #include <net/route.h>
   88 #include <net/if_dl.h>
   89 #include <net/vnet.h>
   90 
   91 #include <netinet/in.h>
   92 #include <netinet/in_var.h>
   93 #include <net/if_llatbl.h>
   94 #include <netinet/if_ether.h>
   95 #include <netinet/in_systm.h>
   96 #include <netinet/ip.h>
   97 #include <netinet/in_pcb.h>
   98 
   99 #include <netinet/ip6.h>
  100 #include <netinet6/ip6_var.h>
  101 #include <netinet6/nd6.h>
  102 #include <netinet6/mld6_var.h>
  103 #include <netinet6/ip6_mroute.h>
  104 #include <netinet6/in6_ifattach.h>
  105 #include <netinet6/scope6_var.h>
  106 #include <netinet6/in6_pcb.h>
  107 
  108 /*
  109  * Definitions of some costant IP6 addresses.
  110  */
  111 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
  112 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
  113 const struct in6_addr in6addr_nodelocal_allnodes =
  114         IN6ADDR_NODELOCAL_ALLNODES_INIT;
  115 const struct in6_addr in6addr_linklocal_allnodes =
  116         IN6ADDR_LINKLOCAL_ALLNODES_INIT;
  117 const struct in6_addr in6addr_linklocal_allrouters =
  118         IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
  119 const struct in6_addr in6addr_linklocal_allv2routers =
  120         IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
  121 
  122 const struct in6_addr in6mask0 = IN6MASK0;
  123 const struct in6_addr in6mask32 = IN6MASK32;
  124 const struct in6_addr in6mask64 = IN6MASK64;
  125 const struct in6_addr in6mask96 = IN6MASK96;
  126 const struct in6_addr in6mask128 = IN6MASK128;
  127 
  128 const struct sockaddr_in6 sa6_any =
  129         { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
  130 
  131 static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
  132         struct ifnet *, struct thread *));
  133 static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *,
  134         struct sockaddr_in6 *, int));
  135 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
  136 
  137 int     (*faithprefix_p)(struct in6_addr *);
  138 
  139 #define ifa2ia6(ifa)    ((struct in6_ifaddr *)(ifa))
  140 #define ia62ifa(ia6)    (&((ia6)->ia_ifa))
  141 
  142 void
  143 in6_ifaddloop(struct ifaddr *ifa)
  144 {
  145         struct sockaddr_dl gateway;
  146         struct sockaddr_in6 mask, addr;
  147         struct rtentry rt;
  148         struct in6_ifaddr *ia;
  149         struct ifnet *ifp;
  150         struct llentry *ln;
  151 
  152         ia = ifa2ia6(ifa);
  153         ifp = ifa->ifa_ifp;
  154         IF_AFDATA_LOCK(ifp);
  155         ifa->ifa_rtrequest = nd6_rtrequest;
  156         ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR |
  157             LLE_EXCLUSIVE), (struct sockaddr *)&ia->ia_addr);
  158         IF_AFDATA_UNLOCK(ifp);
  159         if (ln != NULL) {
  160                 ln->la_expire = 0;  /* for IPv6 this means permanent */
  161                 ln->ln_state = ND6_LLINFO_REACHABLE;
  162                 /*
  163                  * initialize for rtmsg generation
  164                  */
  165                 bzero(&gateway, sizeof(gateway));
  166                 gateway.sdl_len = sizeof(gateway);
  167                 gateway.sdl_family = AF_LINK;
  168                 gateway.sdl_nlen = 0;
  169                 gateway.sdl_alen = 6;
  170                 memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned,
  171                     sizeof(ln->ll_addr));
  172                 LLE_WUNLOCK(ln);
  173         }
  174 
  175         bzero(&rt, sizeof(rt));
  176         rt.rt_gateway = (struct sockaddr *)&gateway;
  177         memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
  178         memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
  179         rt_mask(&rt) = (struct sockaddr *)&mask;
  180         rt_key(&rt) = (struct sockaddr *)&addr;
  181         rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC;
  182         /* Announce arrival of local address to all FIBs. */
  183         rt_newaddrmsg(RTM_ADD, ifa, 0, &rt);
  184 }
  185 
  186 void
  187 in6_ifremloop(struct ifaddr *ifa)
  188 {
  189         struct sockaddr_dl gateway;
  190         struct sockaddr_in6 mask, addr;
  191         struct rtentry rt0;
  192         struct in6_ifaddr *ia;
  193         struct ifnet *ifp;
  194 
  195         ia = ifa2ia6(ifa);
  196         ifp = ifa->ifa_ifp;
  197         IF_AFDATA_LOCK(ifp);
  198         lla_lookup(LLTABLE6(ifp), (LLE_DELETE | LLE_IFADDR),
  199             (struct sockaddr *)&ia->ia_addr);
  200         IF_AFDATA_UNLOCK(ifp);
  201 
  202         /*
  203          * initialize for rtmsg generation
  204          */
  205         bzero(&gateway, sizeof(gateway));
  206         gateway.sdl_len = sizeof(gateway);
  207         gateway.sdl_family = AF_LINK;
  208         gateway.sdl_nlen = 0;
  209         gateway.sdl_alen = ifp->if_addrlen;
  210         bzero(&rt0, sizeof(rt0));
  211         rt0.rt_gateway = (struct sockaddr *)&gateway;
  212         memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
  213         memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
  214         rt_mask(&rt0) = (struct sockaddr *)&mask;
  215         rt_key(&rt0) = (struct sockaddr *)&addr;
  216         rt0.rt_flags = RTF_HOST | RTF_STATIC;
  217         /* Announce removal of local address to all FIBs. */
  218         rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0);
  219 }
  220 
  221 int
  222 in6_mask2len(struct in6_addr *mask, u_char *lim0)
  223 {
  224         int x = 0, y;
  225         u_char *lim = lim0, *p;
  226 
  227         /* ignore the scope_id part */
  228         if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
  229                 lim = (u_char *)mask + sizeof(*mask);
  230         for (p = (u_char *)mask; p < lim; x++, p++) {
  231                 if (*p != 0xff)
  232                         break;
  233         }
  234         y = 0;
  235         if (p < lim) {
  236                 for (y = 0; y < 8; y++) {
  237                         if ((*p & (0x80 >> y)) == 0)
  238                                 break;
  239                 }
  240         }
  241 
  242         /*
  243          * when the limit pointer is given, do a stricter check on the
  244          * remaining bits.
  245          */
  246         if (p < lim) {
  247                 if (y != 0 && (*p & (0x00ff >> y)) != 0)
  248                         return (-1);
  249                 for (p = p + 1; p < lim; p++)
  250                         if (*p != 0)
  251                                 return (-1);
  252         }
  253 
  254         return x * 8 + y;
  255 }
  256 
  257 #ifdef COMPAT_FREEBSD32
  258 struct in6_ndifreq32 {
  259         char ifname[IFNAMSIZ];
  260         uint32_t ifindex;
  261 };
  262 #define SIOCGDEFIFACE32_IN6     _IOWR('i', 86, struct in6_ndifreq32)
  263 #endif
  264 
  265 int
  266 in6_control(struct socket *so, u_long cmd, caddr_t data,
  267     struct ifnet *ifp, struct thread *td)
  268 {
  269         struct  in6_ifreq *ifr = (struct in6_ifreq *)data;
  270         struct  in6_ifaddr *ia = NULL;
  271         struct  in6_aliasreq *ifra = (struct in6_aliasreq *)data;
  272         struct sockaddr_in6 *sa6;
  273         int error;
  274 
  275         switch (cmd) {
  276         case SIOCGETSGCNT_IN6:
  277         case SIOCGETMIFCNT_IN6:
  278                 /*      
  279                  * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
  280                  * We cannot see how that would be needed, so do not adjust the
  281                  * KPI blindly; more likely should clean up the IPv4 variant.
  282                  */
  283                 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
  284         }
  285 
  286         switch(cmd) {
  287         case SIOCAADDRCTL_POLICY:
  288         case SIOCDADDRCTL_POLICY:
  289                 if (td != NULL) {
  290                         error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
  291                         if (error)
  292                                 return (error);
  293                 }
  294                 return (in6_src_ioctl(cmd, data));
  295         }
  296 
  297         if (ifp == NULL)
  298                 return (EOPNOTSUPP);
  299 
  300         switch (cmd) {
  301         case SIOCSNDFLUSH_IN6:
  302         case SIOCSPFXFLUSH_IN6:
  303         case SIOCSRTRFLUSH_IN6:
  304         case SIOCSDEFIFACE_IN6:
  305         case SIOCSIFINFO_FLAGS:
  306         case SIOCSIFINFO_IN6:
  307                 if (td != NULL) {
  308                         error = priv_check(td, PRIV_NETINET_ND6);
  309                         if (error)
  310                                 return (error);
  311                 }
  312                 /* FALLTHROUGH */
  313         case OSIOCGIFINFO_IN6:
  314         case SIOCGIFINFO_IN6:
  315         case SIOCGDRLST_IN6:
  316         case SIOCGPRLST_IN6:
  317         case SIOCGNBRINFO_IN6:
  318         case SIOCGDEFIFACE_IN6:
  319                 return (nd6_ioctl(cmd, data, ifp));
  320 
  321 #ifdef COMPAT_FREEBSD32
  322         case SIOCGDEFIFACE32_IN6:
  323                 {
  324                         struct in6_ndifreq ndif;
  325                         struct in6_ndifreq32 *ndif32;
  326 
  327                         error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
  328                             ifp);
  329                         if (error)
  330                                 return (error);
  331                         ndif32 = (struct in6_ndifreq32 *)data;
  332                         ndif32->ifindex = ndif.ifindex;
  333                         return (0);
  334                 }
  335 #endif
  336         }
  337 
  338         switch (cmd) {
  339         case SIOCSIFPREFIX_IN6:
  340         case SIOCDIFPREFIX_IN6:
  341         case SIOCAIFPREFIX_IN6:
  342         case SIOCCIFPREFIX_IN6:
  343         case SIOCSGIFPREFIX_IN6:
  344         case SIOCGIFPREFIX_IN6:
  345                 log(LOG_NOTICE,
  346                     "prefix ioctls are now invalidated. "
  347                     "please use ifconfig.\n");
  348                 return (EOPNOTSUPP);
  349         }
  350 
  351         switch (cmd) {
  352         case SIOCSSCOPE6:
  353                 if (td != NULL) {
  354                         error = priv_check(td, PRIV_NETINET_SCOPE6);
  355                         if (error)
  356                                 return (error);
  357                 }
  358                 return (scope6_set(ifp,
  359                     (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
  360         case SIOCGSCOPE6:
  361                 return (scope6_get(ifp,
  362                     (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
  363         case SIOCGSCOPE6DEF:
  364                 return (scope6_get_default((struct scope6_id *)
  365                     ifr->ifr_ifru.ifru_scope_id));
  366         }
  367 
  368         switch (cmd) {
  369         case SIOCALIFADDR:
  370                 if (td != NULL) {
  371                         error = priv_check(td, PRIV_NET_ADDIFADDR);
  372                         if (error)
  373                                 return (error);
  374                 }
  375                 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
  376 
  377         case SIOCDLIFADDR:
  378                 if (td != NULL) {
  379                         error = priv_check(td, PRIV_NET_DELIFADDR);
  380                         if (error)
  381                                 return (error);
  382                 }
  383                 /* FALLTHROUGH */
  384         case SIOCGLIFADDR:
  385                 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
  386         }
  387 
  388         /*
  389          * Find address for this interface, if it exists.
  390          *
  391          * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
  392          * only, and used the first interface address as the target of other
  393          * operations (without checking ifra_addr).  This was because netinet
  394          * code/API assumed at most 1 interface address per interface.
  395          * Since IPv6 allows a node to assign multiple addresses
  396          * on a single interface, we almost always look and check the
  397          * presence of ifra_addr, and reject invalid ones here.
  398          * It also decreases duplicated code among SIOC*_IN6 operations.
  399          */
  400         switch (cmd) {
  401         case SIOCAIFADDR_IN6:
  402         case SIOCSIFPHYADDR_IN6:
  403                 sa6 = &ifra->ifra_addr;
  404                 break;
  405         case SIOCSIFADDR_IN6:
  406         case SIOCGIFADDR_IN6:
  407         case SIOCSIFDSTADDR_IN6:
  408         case SIOCSIFNETMASK_IN6:
  409         case SIOCGIFDSTADDR_IN6:
  410         case SIOCGIFNETMASK_IN6:
  411         case SIOCDIFADDR_IN6:
  412         case SIOCGIFPSRCADDR_IN6:
  413         case SIOCGIFPDSTADDR_IN6:
  414         case SIOCGIFAFLAG_IN6:
  415         case SIOCSNDFLUSH_IN6:
  416         case SIOCSPFXFLUSH_IN6:
  417         case SIOCSRTRFLUSH_IN6:
  418         case SIOCGIFALIFETIME_IN6:
  419         case SIOCSIFALIFETIME_IN6:
  420         case SIOCGIFSTAT_IN6:
  421         case SIOCGIFSTAT_ICMP6:
  422                 sa6 = &ifr->ifr_addr;
  423                 break;
  424         case SIOCSIFADDR:
  425         case SIOCSIFBRDADDR:
  426         case SIOCSIFDSTADDR:
  427         case SIOCSIFNETMASK:
  428                 /*
  429                  * Although we should pass any non-INET6 ioctl requests
  430                  * down to driver, we filter some legacy INET requests.
  431                  * Drivers trust SIOCSIFADDR et al to come from an already
  432                  * privileged layer, and do not perform any credentials
  433                  * checks or input validation.
  434                  */
  435                 return (EINVAL);
  436         default:
  437                 sa6 = NULL;
  438                 break;
  439         }
  440         if (sa6 && sa6->sin6_family == AF_INET6) {
  441                 if (sa6->sin6_scope_id != 0)
  442                         error = sa6_embedscope(sa6, 0);
  443                 else
  444                         error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
  445                 if (error != 0)
  446                         return (error);
  447                 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
  448                     &sa6->sin6_addr)) != 0)
  449                         return (error);
  450                 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
  451         } else
  452                 ia = NULL;
  453 
  454         switch (cmd) {
  455         case SIOCSIFADDR_IN6:
  456         case SIOCSIFDSTADDR_IN6:
  457         case SIOCSIFNETMASK_IN6:
  458                 /*
  459                  * Since IPv6 allows a node to assign multiple addresses
  460                  * on a single interface, SIOCSIFxxx ioctls are deprecated.
  461                  */
  462                 /* we decided to obsolete this command (20000704) */
  463                 error = EINVAL;
  464                 goto out;
  465 
  466         case SIOCDIFADDR_IN6:
  467                 /*
  468                  * for IPv4, we look for existing in_ifaddr here to allow
  469                  * "ifconfig if0 delete" to remove the first IPv4 address on
  470                  * the interface.  For IPv6, as the spec allows multiple
  471                  * interface address from the day one, we consider "remove the
  472                  * first one" semantics to be not preferable.
  473                  */
  474                 if (ia == NULL) {
  475                         error = EADDRNOTAVAIL;
  476                         goto out;
  477                 }
  478                 /* FALLTHROUGH */
  479         case SIOCAIFADDR_IN6:
  480                 /*
  481                  * We always require users to specify a valid IPv6 address for
  482                  * the corresponding operation.
  483                  */
  484                 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
  485                     ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
  486                         error = EAFNOSUPPORT;
  487                         goto out;
  488                 }
  489 
  490                 if (td != NULL) {
  491                         error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 
  492                             PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
  493                         if (error)
  494                                 goto out;
  495                 }
  496                 break;
  497 
  498         case SIOCGIFADDR_IN6:
  499                 /* This interface is basically deprecated. use SIOCGIFCONF. */
  500                 /* FALLTHROUGH */
  501         case SIOCGIFAFLAG_IN6:
  502         case SIOCGIFNETMASK_IN6:
  503         case SIOCGIFDSTADDR_IN6:
  504         case SIOCGIFALIFETIME_IN6:
  505                 /* must think again about its semantics */
  506                 if (ia == NULL) {
  507                         error = EADDRNOTAVAIL;
  508                         goto out;
  509                 }
  510                 break;
  511 
  512         case SIOCSIFALIFETIME_IN6:
  513             {
  514                 struct in6_addrlifetime *lt;
  515 
  516                 if (td != NULL) {
  517                         error = priv_check(td, PRIV_NETINET_ALIFETIME6);
  518                         if (error)
  519                                 goto out;
  520                 }
  521                 if (ia == NULL) {
  522                         error = EADDRNOTAVAIL;
  523                         goto out;
  524                 }
  525                 /* sanity for overflow - beware unsigned */
  526                 lt = &ifr->ifr_ifru.ifru_lifetime;
  527                 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
  528                     lt->ia6t_vltime + time_second < time_second) {
  529                         error = EINVAL;
  530                         goto out;
  531                 }
  532                 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
  533                     lt->ia6t_pltime + time_second < time_second) {
  534                         error = EINVAL;
  535                         goto out;
  536                 }
  537                 break;
  538             }
  539         }
  540 
  541         switch (cmd) {
  542         case SIOCGIFADDR_IN6:
  543                 ifr->ifr_addr = ia->ia_addr;
  544                 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
  545                         goto out;
  546                 break;
  547 
  548         case SIOCGIFDSTADDR_IN6:
  549                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
  550                         error = EINVAL;
  551                         goto out;
  552                 }
  553                 /*
  554                  * XXX: should we check if ifa_dstaddr is NULL and return
  555                  * an error?
  556                  */
  557                 ifr->ifr_dstaddr = ia->ia_dstaddr;
  558                 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
  559                         goto out;
  560                 break;
  561 
  562         case SIOCGIFNETMASK_IN6:
  563                 ifr->ifr_addr = ia->ia_prefixmask;
  564                 break;
  565 
  566         case SIOCGIFAFLAG_IN6:
  567                 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
  568                 break;
  569 
  570         case SIOCGIFSTAT_IN6:
  571                 if (ifp == NULL) {
  572                         error = EINVAL;
  573                         goto out;
  574                 }
  575                 bzero(&ifr->ifr_ifru.ifru_stat,
  576                     sizeof(ifr->ifr_ifru.ifru_stat));
  577                 ifr->ifr_ifru.ifru_stat =
  578                     *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
  579                 break;
  580 
  581         case SIOCGIFSTAT_ICMP6:
  582                 if (ifp == NULL) {
  583                         error = EINVAL;
  584                         goto out;
  585                 }
  586                 bzero(&ifr->ifr_ifru.ifru_icmp6stat,
  587                     sizeof(ifr->ifr_ifru.ifru_icmp6stat));
  588                 ifr->ifr_ifru.ifru_icmp6stat =
  589                     *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
  590                 break;
  591 
  592         case SIOCGIFALIFETIME_IN6:
  593                 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
  594                 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  595                         time_t maxexpire;
  596                         struct in6_addrlifetime *retlt =
  597                             &ifr->ifr_ifru.ifru_lifetime;
  598 
  599                         /*
  600                          * XXX: adjust expiration time assuming time_t is
  601                          * signed.
  602                          */
  603                         maxexpire = (-1) &
  604                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
  605                         if (ia->ia6_lifetime.ia6t_vltime <
  606                             maxexpire - ia->ia6_updatetime) {
  607                                 retlt->ia6t_expire = ia->ia6_updatetime +
  608                                     ia->ia6_lifetime.ia6t_vltime;
  609                         } else
  610                                 retlt->ia6t_expire = maxexpire;
  611                 }
  612                 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  613                         time_t maxexpire;
  614                         struct in6_addrlifetime *retlt =
  615                             &ifr->ifr_ifru.ifru_lifetime;
  616 
  617                         /*
  618                          * XXX: adjust expiration time assuming time_t is
  619                          * signed.
  620                          */
  621                         maxexpire = (-1) &
  622                             ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
  623                         if (ia->ia6_lifetime.ia6t_pltime <
  624                             maxexpire - ia->ia6_updatetime) {
  625                                 retlt->ia6t_preferred = ia->ia6_updatetime +
  626                                     ia->ia6_lifetime.ia6t_pltime;
  627                         } else
  628                                 retlt->ia6t_preferred = maxexpire;
  629                 }
  630                 break;
  631 
  632         case SIOCSIFALIFETIME_IN6:
  633                 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
  634                 /* for sanity */
  635                 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
  636                         ia->ia6_lifetime.ia6t_expire =
  637                                 time_second + ia->ia6_lifetime.ia6t_vltime;
  638                 } else
  639                         ia->ia6_lifetime.ia6t_expire = 0;
  640                 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
  641                         ia->ia6_lifetime.ia6t_preferred =
  642                                 time_second + ia->ia6_lifetime.ia6t_pltime;
  643                 } else
  644                         ia->ia6_lifetime.ia6t_preferred = 0;
  645                 break;
  646 
  647         case SIOCAIFADDR_IN6:
  648         {
  649                 int i;
  650                 struct nd_prefixctl pr0;
  651                 struct nd_prefix *pr;
  652 
  653                 /*
  654                  * first, make or update the interface address structure,
  655                  * and link it to the list.
  656                  */
  657                 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
  658                         goto out;
  659                 if (ia != NULL)
  660                         ifa_free(&ia->ia_ifa);
  661                 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
  662                     == NULL) {
  663                         /*
  664                          * this can happen when the user specify the 0 valid
  665                          * lifetime.
  666                          */
  667                         break;
  668                 }
  669 
  670                 /*
  671                  * then, make the prefix on-link on the interface.
  672                  * XXX: we'd rather create the prefix before the address, but
  673                  * we need at least one address to install the corresponding
  674                  * interface route, so we configure the address first.
  675                  */
  676 
  677                 /*
  678                  * convert mask to prefix length (prefixmask has already
  679                  * been validated in in6_update_ifa().
  680                  */
  681                 bzero(&pr0, sizeof(pr0));
  682                 pr0.ndpr_ifp = ifp;
  683                 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
  684                     NULL);
  685                 if (pr0.ndpr_plen == 128) {
  686                         break;  /* we don't need to install a host route. */
  687                 }
  688                 pr0.ndpr_prefix = ifra->ifra_addr;
  689                 /* apply the mask for safety. */
  690                 for (i = 0; i < 4; i++) {
  691                         pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
  692                             ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
  693                 }
  694                 /*
  695                  * XXX: since we don't have an API to set prefix (not address)
  696                  * lifetimes, we just use the same lifetimes as addresses.
  697                  * The (temporarily) installed lifetimes can be overridden by
  698                  * later advertised RAs (when accept_rtadv is non 0), which is
  699                  * an intended behavior.
  700                  */
  701                 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
  702                 pr0.ndpr_raf_auto =
  703                     ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
  704                 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
  705                 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
  706 
  707                 /* add the prefix if not yet. */
  708                 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
  709                         /*
  710                          * nd6_prelist_add will install the corresponding
  711                          * interface route.
  712                          */
  713                         if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
  714                                 goto out;
  715                         if (pr == NULL) {
  716                                 log(LOG_ERR, "nd6_prelist_add succeeded but "
  717                                     "no prefix\n");
  718                                 error = EINVAL;
  719                                 goto out;
  720                         }
  721                 }
  722 
  723                 /* relate the address to the prefix */
  724                 if (ia->ia6_ndpr == NULL) {
  725                         ia->ia6_ndpr = pr;
  726                         pr->ndpr_refcnt++;
  727 
  728                         /*
  729                          * If this is the first autoconf address from the
  730                          * prefix, create a temporary address as well
  731                          * (when required).
  732                          */
  733                         if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
  734                             V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
  735                                 int e;
  736                                 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
  737                                         log(LOG_NOTICE, "in6_control: failed "
  738                                             "to create a temporary address, "
  739                                             "errno=%d\n", e);
  740                                 }
  741                         }
  742                 }
  743 
  744                 /*
  745                  * this might affect the status of autoconfigured addresses,
  746                  * that is, this address might make other addresses detached.
  747                  */
  748                 pfxlist_onlink_check();
  749                 if (error == 0 && ia) {
  750                         if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
  751                                 /*
  752                                  * Try to clear the flag when a new
  753                                  * IPv6 address is added onto an
  754                                  * IFDISABLED interface and it
  755                                  * succeeds.
  756                                  */
  757                                 struct in6_ndireq nd;
  758 
  759                                 memset(&nd, 0, sizeof(nd));
  760                                 nd.ndi.flags = ND_IFINFO(ifp)->flags;
  761                                 nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
  762                                 if (nd6_ioctl(SIOCSIFINFO_FLAGS,
  763                                     (caddr_t)&nd, ifp) < 0)
  764                                         log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
  765                                             "SIOCSIFINFO_FLAGS for -ifdisabled "
  766                                             "failed.");
  767                                 /*
  768                                  * Ignore failure of clearing the flag
  769                                  * intentionally.  The failure means
  770                                  * address duplication was detected.
  771                                  */
  772                         }
  773                         EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  774                 }
  775                 break;
  776         }
  777 
  778         case SIOCDIFADDR_IN6:
  779         {
  780                 struct nd_prefix *pr;
  781 
  782                 /*
  783                  * If the address being deleted is the only one that owns
  784                  * the corresponding prefix, expire the prefix as well.
  785                  * XXX: theoretically, we don't have to worry about such
  786                  * relationship, since we separate the address management
  787                  * and the prefix management.  We do this, however, to provide
  788                  * as much backward compatibility as possible in terms of
  789                  * the ioctl operation.
  790                  * Note that in6_purgeaddr() will decrement ndpr_refcnt.
  791                  */
  792                 pr = ia->ia6_ndpr;
  793                 in6_purgeaddr(&ia->ia_ifa);
  794                 if (pr && pr->ndpr_refcnt == 0)
  795                         prelist_remove(pr);
  796                 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
  797                 break;
  798         }
  799 
  800         default:
  801                 if (ifp == NULL || ifp->if_ioctl == 0) {
  802                         error = EOPNOTSUPP;
  803                         goto out;
  804                 }
  805                 error = (*ifp->if_ioctl)(ifp, cmd, data);
  806                 goto out;
  807         }
  808 
  809         error = 0;
  810 out:
  811         if (ia != NULL)
  812                 ifa_free(&ia->ia_ifa);
  813         return (error);
  814 }
  815 
  816 
  817 /*
  818  * Join necessary multicast groups.  Factored out from in6_update_ifa().
  819  * This entire work should only be done once, for the default FIB.
  820  */
  821 static int
  822 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
  823     struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
  824 {
  825         char ip6buf[INET6_ADDRSTRLEN];
  826         struct sockaddr_in6 mltaddr, mltmask;
  827         struct in6_addr llsol;
  828         struct in6_multi_mship *imm;
  829         struct rtentry *rt;
  830         int delay, error;
  831 
  832         KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
  833 
  834         /* Join solicited multicast addr for new host id. */
  835         bzero(&llsol, sizeof(struct in6_addr));
  836         llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
  837         llsol.s6_addr32[1] = 0;
  838         llsol.s6_addr32[2] = htonl(1);
  839         llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
  840         llsol.s6_addr8[12] = 0xff;
  841         if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
  842                 /* XXX: should not happen */
  843                 log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
  844                 goto cleanup;
  845         }
  846         delay = 0;
  847         if ((flags & IN6_IFAUPDATE_DADDELAY)) {
  848                 /*
  849                  * We need a random delay for DAD on the address being
  850                  * configured.  It also means delaying transmission of the
  851                  * corresponding MLD report to avoid report collision.
  852                  * [RFC 4861, Section 6.3.7]
  853                  */
  854                 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
  855         }
  856         imm = in6_joingroup(ifp, &llsol, &error, delay);
  857         if (imm == NULL) {
  858                 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
  859                     "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol),
  860                     if_name(ifp), error));
  861                 goto cleanup;
  862         }
  863         LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
  864         *in6m_sol = imm->i6mm_maddr;
  865 
  866         bzero(&mltmask, sizeof(mltmask));
  867         mltmask.sin6_len = sizeof(struct sockaddr_in6);
  868         mltmask.sin6_family = AF_INET6;
  869         mltmask.sin6_addr = in6mask32;
  870 #define MLTMASK_LEN  4  /* mltmask's masklen (=32bit=4octet) */
  871 
  872         /*
  873          * Join link-local all-nodes address.
  874          */
  875         bzero(&mltaddr, sizeof(mltaddr));
  876         mltaddr.sin6_len = sizeof(struct sockaddr_in6);
  877         mltaddr.sin6_family = AF_INET6;
  878         mltaddr.sin6_addr = in6addr_linklocal_allnodes;
  879         if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
  880                 goto cleanup; /* XXX: should not fail */
  881 
  882         /*
  883          * XXX: do we really need this automatic routes?  We should probably
  884          * reconsider this stuff.  Most applications actually do not need the
  885          * routes, since they usually specify the outgoing interface.
  886          */
  887         rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
  888         if (rt != NULL) {
  889                 /* XXX: only works in !SCOPEDROUTING case. */
  890                 if (memcmp(&mltaddr.sin6_addr,
  891                     &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
  892                     MLTMASK_LEN)) {
  893                         RTFREE_LOCKED(rt);
  894                         rt = NULL;
  895                 }
  896         }
  897         if (rt == NULL) {
  898                 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
  899                     (struct sockaddr *)&ia->ia_addr,
  900                     (struct sockaddr *)&mltmask, RTF_UP,
  901                     (struct rtentry **)0, RT_DEFAULT_FIB);
  902                 if (error)
  903                         goto cleanup;
  904         } else
  905                 RTFREE_LOCKED(rt);
  906 
  907         imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
  908         if (imm == NULL) {
  909                 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
  910                     "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
  911                     &mltaddr.sin6_addr), if_name(ifp), error));
  912                 goto cleanup;
  913         }
  914         LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
  915 
  916         /*
  917          * Join node information group address.
  918          */
  919         delay = 0;
  920         if ((flags & IN6_IFAUPDATE_DADDELAY)) {
  921                 /*
  922                  * The spec does not say anything about delay for this group,
  923                  * but the same logic should apply.
  924                  */
  925                 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
  926         }
  927         if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
  928                 /* XXX jinmei */
  929                 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay);
  930                 if (imm == NULL)
  931                         nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
  932                             "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
  933                             &mltaddr.sin6_addr), if_name(ifp), error));
  934                         /* XXX not very fatal, go on... */
  935                 else
  936                         LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
  937         }
  938 
  939         /*
  940          * Join interface-local all-nodes address.
  941          * (ff01::1%ifN, and ff01::%ifN/32)
  942          */
  943         mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
  944         if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
  945                 goto cleanup; /* XXX: should not fail */
  946         /* XXX: again, do we really need the route? */
  947         rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
  948         if (rt != NULL) {
  949                 if (memcmp(&mltaddr.sin6_addr,
  950                     &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
  951                     MLTMASK_LEN)) {
  952                         RTFREE_LOCKED(rt);
  953                         rt = NULL;
  954                 }
  955         }
  956         if (rt == NULL) {
  957                 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
  958                     (struct sockaddr *)&ia->ia_addr,
  959                     (struct sockaddr *)&mltmask, RTF_UP,
  960                     (struct rtentry **)0, RT_DEFAULT_FIB);
  961                 if (error)
  962                         goto cleanup;
  963         } else
  964                 RTFREE_LOCKED(rt);
  965 
  966         imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
  967         if (imm == NULL) {
  968                 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
  969                     "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
  970                     &mltaddr.sin6_addr), if_name(ifp), error));
  971                 goto cleanup;
  972         }
  973         LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
  974 #undef  MLTMASK_LEN
  975 
  976 cleanup:
  977         return (error);
  978 }
  979 
  980 /*
  981  * Update parameters of an IPv6 interface address.
  982  * If necessary, a new entry is created and linked into address chains.
  983  * This function is separated from in6_control().
  984  * XXX: should this be performed under splnet()?
  985  */
  986 int
  987 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
  988     struct in6_ifaddr *ia, int flags)
  989 {
  990         int error = 0, hostIsNew = 0, plen = -1;
  991         struct sockaddr_in6 dst6;
  992         struct in6_addrlifetime *lt;
  993         struct in6_multi *in6m_sol;
  994         int delay;
  995         char ip6buf[INET6_ADDRSTRLEN];
  996 
  997         /* Validate parameters */
  998         if (ifp == NULL || ifra == NULL) /* this maybe redundant */
  999                 return (EINVAL);
 1000 
 1001         /*
 1002          * The destination address for a p2p link must have a family
 1003          * of AF_UNSPEC or AF_INET6.
 1004          */
 1005         if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
 1006             ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
 1007             ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
 1008                 return (EAFNOSUPPORT);
 1009         /*
 1010          * validate ifra_prefixmask.  don't check sin6_family, netmask
 1011          * does not carry fields other than sin6_len.
 1012          */
 1013         if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
 1014                 return (EINVAL);
 1015         /*
 1016          * Because the IPv6 address architecture is classless, we require
 1017          * users to specify a (non 0) prefix length (mask) for a new address.
 1018          * We also require the prefix (when specified) mask is valid, and thus
 1019          * reject a non-consecutive mask.
 1020          */
 1021         if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
 1022                 return (EINVAL);
 1023         if (ifra->ifra_prefixmask.sin6_len != 0) {
 1024                 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
 1025                     (u_char *)&ifra->ifra_prefixmask +
 1026                     ifra->ifra_prefixmask.sin6_len);
 1027                 if (plen <= 0)
 1028                         return (EINVAL);
 1029         } else {
 1030                 /*
 1031                  * In this case, ia must not be NULL.  We just use its prefix
 1032                  * length.
 1033                  */
 1034                 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
 1035         }
 1036         /*
 1037          * If the destination address on a p2p interface is specified,
 1038          * and the address is a scoped one, validate/set the scope
 1039          * zone identifier.
 1040          */
 1041         dst6 = ifra->ifra_dstaddr;
 1042         if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
 1043             (dst6.sin6_family == AF_INET6)) {
 1044                 struct in6_addr in6_tmp;
 1045                 u_int32_t zoneid;
 1046 
 1047                 in6_tmp = dst6.sin6_addr;
 1048                 if (in6_setscope(&in6_tmp, ifp, &zoneid))
 1049                         return (EINVAL); /* XXX: should be impossible */
 1050 
 1051                 if (dst6.sin6_scope_id != 0) {
 1052                         if (dst6.sin6_scope_id != zoneid)
 1053                                 return (EINVAL);
 1054                 } else          /* user omit to specify the ID. */
 1055                         dst6.sin6_scope_id = zoneid;
 1056 
 1057                 /* convert into the internal form */
 1058                 if (sa6_embedscope(&dst6, 0))
 1059                         return (EINVAL); /* XXX: should be impossible */
 1060         }
 1061         /*
 1062          * The destination address can be specified only for a p2p or a
 1063          * loopback interface.  If specified, the corresponding prefix length
 1064          * must be 128.
 1065          */
 1066         if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
 1067                 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
 1068                         /* XXX: noisy message */
 1069                         nd6log((LOG_INFO, "in6_update_ifa: a destination can "
 1070                             "be specified for a p2p or a loopback IF only\n"));
 1071                         return (EINVAL);
 1072                 }
 1073                 if (plen != 128) {
 1074                         nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
 1075                             "be 128 when dstaddr is specified\n"));
 1076                         return (EINVAL);
 1077                 }
 1078         }
 1079         /* lifetime consistency check */
 1080         lt = &ifra->ifra_lifetime;
 1081         if (lt->ia6t_pltime > lt->ia6t_vltime)
 1082                 return (EINVAL);
 1083         if (lt->ia6t_vltime == 0) {
 1084                 /*
 1085                  * the following log might be noisy, but this is a typical
 1086                  * configuration mistake or a tool's bug.
 1087                  */
 1088                 nd6log((LOG_INFO,
 1089                     "in6_update_ifa: valid lifetime is 0 for %s\n",
 1090                     ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
 1091 
 1092                 if (ia == NULL)
 1093                         return (0); /* there's nothing to do */
 1094         }
 1095 
 1096         /*
 1097          * If this is a new address, allocate a new ifaddr and link it
 1098          * into chains.
 1099          */
 1100         if (ia == NULL) {
 1101                 hostIsNew = 1;
 1102                 /*
 1103                  * When in6_update_ifa() is called in a process of a received
 1104                  * RA, it is called under an interrupt context.  So, we should
 1105                  * call malloc with M_NOWAIT.
 1106                  */
 1107                 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
 1108                     M_NOWAIT);
 1109                 if (ia == NULL)
 1110                         return (ENOBUFS);
 1111                 bzero((caddr_t)ia, sizeof(*ia));
 1112                 ifa_init(&ia->ia_ifa);
 1113                 LIST_INIT(&ia->ia6_memberships);
 1114                 /* Initialize the address and masks, and put time stamp */
 1115                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 1116                 ia->ia_addr.sin6_family = AF_INET6;
 1117                 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
 1118                 ia->ia6_createtime = time_second;
 1119                 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
 1120                         /*
 1121                          * XXX: some functions expect that ifa_dstaddr is not
 1122                          * NULL for p2p interfaces.
 1123                          */
 1124                         ia->ia_ifa.ifa_dstaddr =
 1125                             (struct sockaddr *)&ia->ia_dstaddr;
 1126                 } else {
 1127                         ia->ia_ifa.ifa_dstaddr = NULL;
 1128                 }
 1129                 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
 1130                 ia->ia_ifp = ifp;
 1131                 ifa_ref(&ia->ia_ifa);                   /* if_addrhead */
 1132                 IF_ADDR_WLOCK(ifp);
 1133                 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
 1134                 IF_ADDR_WUNLOCK(ifp);
 1135 
 1136                 ifa_ref(&ia->ia_ifa);                   /* in6_ifaddrhead */
 1137                 IN6_IFADDR_WLOCK();
 1138                 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
 1139                 IN6_IFADDR_WUNLOCK();
 1140         }
 1141 
 1142         /* update timestamp */
 1143         ia->ia6_updatetime = time_second;
 1144 
 1145         /* set prefix mask */
 1146         if (ifra->ifra_prefixmask.sin6_len) {
 1147                 /*
 1148                  * We prohibit changing the prefix length of an existing
 1149                  * address, because
 1150                  * + such an operation should be rare in IPv6, and
 1151                  * + the operation would confuse prefix management.
 1152                  */
 1153                 if (ia->ia_prefixmask.sin6_len &&
 1154                     in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
 1155                         nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
 1156                             " existing (%s) address should not be changed\n",
 1157                             ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
 1158                         error = EINVAL;
 1159                         goto unlink;
 1160                 }
 1161                 ia->ia_prefixmask = ifra->ifra_prefixmask;
 1162         }
 1163 
 1164         /*
 1165          * If a new destination address is specified, scrub the old one and
 1166          * install the new destination.  Note that the interface must be
 1167          * p2p or loopback (see the check above.)
 1168          */
 1169         if (dst6.sin6_family == AF_INET6 &&
 1170             !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
 1171                 int e;
 1172 
 1173                 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
 1174                     (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
 1175                         nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
 1176                             "a route to the old destination: %s\n",
 1177                             ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
 1178                         /* proceed anyway... */
 1179                 } else
 1180                         ia->ia_flags &= ~IFA_ROUTE;
 1181                 ia->ia_dstaddr = dst6;
 1182         }
 1183 
 1184         /*
 1185          * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
 1186          * to see if the address is deprecated or invalidated, but initialize
 1187          * these members for applications.
 1188          */
 1189         ia->ia6_lifetime = ifra->ifra_lifetime;
 1190         if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
 1191                 ia->ia6_lifetime.ia6t_expire =
 1192                     time_second + ia->ia6_lifetime.ia6t_vltime;
 1193         } else
 1194                 ia->ia6_lifetime.ia6t_expire = 0;
 1195         if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
 1196                 ia->ia6_lifetime.ia6t_preferred =
 1197                     time_second + ia->ia6_lifetime.ia6t_pltime;
 1198         } else
 1199                 ia->ia6_lifetime.ia6t_preferred = 0;
 1200 
 1201         /* reset the interface and routing table appropriately. */
 1202         if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
 1203                 goto unlink;
 1204 
 1205         /*
 1206          * configure address flags.
 1207          */
 1208         ia->ia6_flags = ifra->ifra_flags;
 1209         /*
 1210          * backward compatibility - if IN6_IFF_DEPRECATED is set from the
 1211          * userland, make it deprecated.
 1212          */
 1213         if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
 1214                 ia->ia6_lifetime.ia6t_pltime = 0;
 1215                 ia->ia6_lifetime.ia6t_preferred = time_second;
 1216         }
 1217         /*
 1218          * Make the address tentative before joining multicast addresses,
 1219          * so that corresponding MLD responses would not have a tentative
 1220          * source address.
 1221          */
 1222         ia->ia6_flags &= ~IN6_IFF_DUPLICATED;   /* safety */
 1223         if (hostIsNew && in6if_do_dad(ifp))
 1224                 ia->ia6_flags |= IN6_IFF_TENTATIVE;
 1225 
 1226         /* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */
 1227         if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
 1228                 ia->ia6_flags |= IN6_IFF_TENTATIVE;
 1229 
 1230         /*
 1231          * We are done if we have simply modified an existing address.
 1232          */
 1233         if (!hostIsNew)
 1234                 return (error);
 1235 
 1236         /*
 1237          * Beyond this point, we should call in6_purgeaddr upon an error,
 1238          * not just go to unlink.
 1239          */
 1240 
 1241         /* Join necessary multicast groups. */
 1242         in6m_sol = NULL;
 1243         if ((ifp->if_flags & IFF_MULTICAST) != 0) {
 1244                 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
 1245                 if (error)
 1246                         goto cleanup;
 1247         }
 1248 
 1249         /*
 1250          * Perform DAD, if needed.
 1251          * XXX It may be of use, if we can administratively disable DAD.
 1252          */
 1253         if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
 1254             (ia->ia6_flags & IN6_IFF_TENTATIVE))
 1255         {
 1256                 int mindelay, maxdelay;
 1257 
 1258                 delay = 0;
 1259                 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
 1260                         /*
 1261                          * We need to impose a delay before sending an NS
 1262                          * for DAD.  Check if we also needed a delay for the
 1263                          * corresponding MLD message.  If we did, the delay
 1264                          * should be larger than the MLD delay (this could be
 1265                          * relaxed a bit, but this simple logic is at least
 1266                          * safe).
 1267                          * XXX: Break data hiding guidelines and look at
 1268                          * state for the solicited multicast group.
 1269                          */
 1270                         mindelay = 0;
 1271                         if (in6m_sol != NULL &&
 1272                             in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
 1273                                 mindelay = in6m_sol->in6m_timer;
 1274                         }
 1275                         maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
 1276                         if (maxdelay - mindelay == 0)
 1277                                 delay = 0;
 1278                         else {
 1279                                 delay =
 1280                                     (arc4random() % (maxdelay - mindelay)) +
 1281                                     mindelay;
 1282                         }
 1283                 }
 1284                 nd6_dad_start((struct ifaddr *)ia, delay);
 1285         }
 1286 
 1287         KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew"));
 1288         ifa_free(&ia->ia_ifa);
 1289         return (error);
 1290 
 1291   unlink:
 1292         /*
 1293          * XXX: if a change of an existing address failed, keep the entry
 1294          * anyway.
 1295          */
 1296         if (hostIsNew) {
 1297                 in6_unlink_ifa(ia, ifp);
 1298                 ifa_free(&ia->ia_ifa);
 1299         }
 1300         return (error);
 1301 
 1302   cleanup:
 1303         KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew"));
 1304         ifa_free(&ia->ia_ifa);
 1305         in6_purgeaddr(&ia->ia_ifa);
 1306         return error;
 1307 }
 1308 
 1309 /*
 1310  * Leave multicast groups.  Factored out from in6_purgeaddr().
 1311  * This entire work should only be done once, for the default FIB.
 1312  */
 1313 static int
 1314 in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0)
 1315 {
 1316         struct sockaddr_in6 mltaddr, mltmask;
 1317         struct in6_multi_mship *imm;
 1318         struct rtentry *rt;
 1319         struct sockaddr_in6 sin6;
 1320         int error;
 1321 
 1322         /*
 1323          * Leave from multicast groups we have joined for the interface.
 1324          */
 1325         while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
 1326                 LIST_REMOVE(imm, i6mm_chain);
 1327                 in6_leavegroup(imm);
 1328         }
 1329 
 1330         /*
 1331          * Remove the link-local all-nodes address.
 1332          */
 1333         bzero(&mltmask, sizeof(mltmask));
 1334         mltmask.sin6_len = sizeof(struct sockaddr_in6);
 1335         mltmask.sin6_family = AF_INET6;
 1336         mltmask.sin6_addr = in6mask32;
 1337 
 1338         bzero(&mltaddr, sizeof(mltaddr));
 1339         mltaddr.sin6_len = sizeof(struct sockaddr_in6);
 1340         mltaddr.sin6_family = AF_INET6;
 1341         mltaddr.sin6_addr = in6addr_linklocal_allnodes;
 1342 
 1343         if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
 1344                 return (error);
 1345 
 1346         /*
 1347          * As for the mltaddr above, proactively prepare the sin6 to avoid
 1348          * rtentry un- and re-locking.
 1349          */
 1350         if (ifa0 != NULL) {
 1351                 bzero(&sin6, sizeof(sin6));
 1352                 sin6.sin6_len = sizeof(sin6);
 1353                 sin6.sin6_family = AF_INET6;
 1354                 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 
 1355                     sizeof(sin6.sin6_addr));
 1356                 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL);
 1357                 if (error != 0)
 1358                         return (error);
 1359         }
 1360 
 1361         rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
 1362         if (rt != NULL && rt->rt_gateway != NULL &&
 1363             (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 
 1364                     &ia->ia_addr.sin6_addr,
 1365                     sizeof(ia->ia_addr.sin6_addr)) == 0)) {
 1366                 /* 
 1367                  * If no more IPv6 address exists on this interface then
 1368                  * remove the multicast address route.
 1369                  */
 1370                 if (ifa0 == NULL) {
 1371                         memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 
 1372                                sizeof(mltaddr.sin6_addr));
 1373                         RTFREE_LOCKED(rt);
 1374                         error = in6_rtrequest(RTM_DELETE,
 1375                             (struct sockaddr *)&mltaddr,
 1376                             (struct sockaddr *)&ia->ia_addr,
 1377                             (struct sockaddr *)&mltmask, RTF_UP,
 1378                             (struct rtentry **)0, RT_DEFAULT_FIB);
 1379                         if (error)
 1380                                 log(LOG_INFO, "%s: link-local all-nodes "
 1381                                     "multicast address deletion error\n",
 1382                                     __func__);
 1383                 } else {
 1384                         /*
 1385                          * Replace the gateway of the route.
 1386                          */
 1387                         memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
 1388                         RTFREE_LOCKED(rt);
 1389                 }
 1390         } else {
 1391                 if (rt != NULL)
 1392                         RTFREE_LOCKED(rt);
 1393         }
 1394 
 1395         /*
 1396          * Remove the node-local all-nodes address.
 1397          */
 1398         mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
 1399         if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
 1400                 return (error);
 1401 
 1402         rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
 1403         if (rt != NULL && rt->rt_gateway != NULL &&
 1404             (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 
 1405                     &ia->ia_addr.sin6_addr,
 1406                     sizeof(ia->ia_addr.sin6_addr)) == 0)) {
 1407                 /* 
 1408                  * If no more IPv6 address exists on this interface then
 1409                  * remove the multicast address route.
 1410                  */
 1411                 if (ifa0 == NULL) {
 1412                         memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 
 1413                                sizeof(mltaddr.sin6_addr));
 1414 
 1415                         RTFREE_LOCKED(rt);
 1416                         error = in6_rtrequest(RTM_DELETE,
 1417                             (struct sockaddr *)&mltaddr,
 1418                             (struct sockaddr *)&ia->ia_addr,
 1419                             (struct sockaddr *)&mltmask, RTF_UP,
 1420                             (struct rtentry **)0, RT_DEFAULT_FIB);
 1421                         if (error)
 1422                                 log(LOG_INFO, "%s: node-local all-nodes"
 1423                                     "multicast address deletion error\n",
 1424                                     __func__);
 1425                 } else {
 1426                         /*
 1427                          * Replace the gateway of the route.
 1428                          */
 1429                         memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
 1430                         RTFREE_LOCKED(rt);
 1431                 }
 1432         } else {
 1433                 if (rt != NULL)
 1434                         RTFREE_LOCKED(rt);
 1435         }
 1436 
 1437         return (0);
 1438 }
 1439 
 1440 void
 1441 in6_purgeaddr(struct ifaddr *ifa)
 1442 {
 1443         struct ifnet *ifp = ifa->ifa_ifp;
 1444         struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
 1445         int plen, error;
 1446         struct ifaddr *ifa0;
 1447 
 1448         /*
 1449          * find another IPv6 address as the gateway for the
 1450          * link-local and node-local all-nodes multicast
 1451          * address routes
 1452          */
 1453         IF_ADDR_RLOCK(ifp);
 1454         TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) {
 1455                 if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
 1456                     memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
 1457                            &ia->ia_addr.sin6_addr, 
 1458                            sizeof(struct in6_addr)) == 0)
 1459                         continue;
 1460                 else
 1461                         break;
 1462         }
 1463         if (ifa0 != NULL)
 1464                 ifa_ref(ifa0);
 1465         IF_ADDR_RUNLOCK(ifp);
 1466 
 1467         /*
 1468          * Remove the loopback route to the interface address.
 1469          * The check for the current setting of "nd6_useloopback" 
 1470          * is not needed.
 1471          */
 1472         if (ia->ia_flags & IFA_RTSELF) {
 1473                 error = ifa_del_loopback_route((struct ifaddr *)ia,
 1474                                        (struct sockaddr *)&ia->ia_addr);
 1475                 if (error == 0)
 1476                         ia->ia_flags &= ~IFA_RTSELF;
 1477         }
 1478 
 1479         /* stop DAD processing */
 1480         nd6_dad_stop(ifa);
 1481 
 1482         /* Remove local address entry from lltable. */
 1483         in6_ifremloop(ifa);
 1484 
 1485         /* Leave multicast groups. */
 1486         error = in6_purgeaddr_mc(ifp, ia, ifa0);
 1487 
 1488         if (ifa0 != NULL)
 1489                 ifa_free(ifa0);
 1490 
 1491         plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
 1492         if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
 1493                 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
 1494                     (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
 1495                 if (error != 0)
 1496                         log(LOG_INFO, "%s: err=%d, destination address delete "
 1497                             "failed\n", __func__, error);
 1498                 ia->ia_flags &= ~IFA_ROUTE;
 1499         }
 1500 
 1501         in6_unlink_ifa(ia, ifp);
 1502 }
 1503 
 1504 static void
 1505 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
 1506 {
 1507         int     s = splnet();
 1508 
 1509         IF_ADDR_WLOCK(ifp);
 1510         TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
 1511         IF_ADDR_WUNLOCK(ifp);
 1512         ifa_free(&ia->ia_ifa);                  /* if_addrhead */
 1513 
 1514         /*
 1515          * Defer the release of what might be the last reference to the
 1516          * in6_ifaddr so that it can't be freed before the remainder of the
 1517          * cleanup.
 1518          */
 1519         IN6_IFADDR_WLOCK();
 1520         TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
 1521         IN6_IFADDR_WUNLOCK();
 1522 
 1523         /*
 1524          * Release the reference to the base prefix.  There should be a
 1525          * positive reference.
 1526          */
 1527         if (ia->ia6_ndpr == NULL) {
 1528                 nd6log((LOG_NOTICE,
 1529                     "in6_unlink_ifa: autoconf'ed address "
 1530                     "%p has no prefix\n", ia));
 1531         } else {
 1532                 ia->ia6_ndpr->ndpr_refcnt--;
 1533                 ia->ia6_ndpr = NULL;
 1534         }
 1535 
 1536         /*
 1537          * Also, if the address being removed is autoconf'ed, call
 1538          * pfxlist_onlink_check() since the release might affect the status of
 1539          * other (detached) addresses.
 1540          */
 1541         if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
 1542                 pfxlist_onlink_check();
 1543         }
 1544         ifa_free(&ia->ia_ifa);                  /* in6_ifaddrhead */
 1545         splx(s);
 1546 }
 1547 
 1548 void
 1549 in6_purgeif(struct ifnet *ifp)
 1550 {
 1551         struct ifaddr *ifa, *nifa;
 1552 
 1553         TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
 1554                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1555                         continue;
 1556                 in6_purgeaddr(ifa);
 1557         }
 1558 
 1559         in6_ifdetach(ifp);
 1560 }
 1561 
 1562 /*
 1563  * SIOC[GAD]LIFADDR.
 1564  *      SIOCGLIFADDR: get first address. (?)
 1565  *      SIOCGLIFADDR with IFLR_PREFIX:
 1566  *              get first address that matches the specified prefix.
 1567  *      SIOCALIFADDR: add the specified address.
 1568  *      SIOCALIFADDR with IFLR_PREFIX:
 1569  *              add the specified prefix, filling hostid part from
 1570  *              the first link-local address.  prefixlen must be <= 64.
 1571  *      SIOCDLIFADDR: delete the specified address.
 1572  *      SIOCDLIFADDR with IFLR_PREFIX:
 1573  *              delete the first address that matches the specified prefix.
 1574  * return values:
 1575  *      EINVAL on invalid parameters
 1576  *      EADDRNOTAVAIL on prefix match failed/specified address not found
 1577  *      other values may be returned from in6_ioctl()
 1578  *
 1579  * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
 1580  * this is to accomodate address naming scheme other than RFC2374,
 1581  * in the future.
 1582  * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
 1583  * address encoding scheme. (see figure on page 8)
 1584  */
 1585 static int
 1586 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
 1587     struct ifnet *ifp, struct thread *td)
 1588 {
 1589         struct if_laddrreq *iflr = (struct if_laddrreq *)data;
 1590         struct ifaddr *ifa;
 1591         struct sockaddr *sa;
 1592 
 1593         /* sanity checks */
 1594         if (!data || !ifp) {
 1595                 panic("invalid argument to in6_lifaddr_ioctl");
 1596                 /* NOTREACHED */
 1597         }
 1598 
 1599         switch (cmd) {
 1600         case SIOCGLIFADDR:
 1601                 /* address must be specified on GET with IFLR_PREFIX */
 1602                 if ((iflr->flags & IFLR_PREFIX) == 0)
 1603                         break;
 1604                 /* FALLTHROUGH */
 1605         case SIOCALIFADDR:
 1606         case SIOCDLIFADDR:
 1607                 /* address must be specified on ADD and DELETE */
 1608                 sa = (struct sockaddr *)&iflr->addr;
 1609                 if (sa->sa_family != AF_INET6)
 1610                         return EINVAL;
 1611                 if (sa->sa_len != sizeof(struct sockaddr_in6))
 1612                         return EINVAL;
 1613                 /* XXX need improvement */
 1614                 sa = (struct sockaddr *)&iflr->dstaddr;
 1615                 if (sa->sa_family && sa->sa_family != AF_INET6)
 1616                         return EINVAL;
 1617                 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
 1618                         return EINVAL;
 1619                 break;
 1620         default: /* shouldn't happen */
 1621 #if 0
 1622                 panic("invalid cmd to in6_lifaddr_ioctl");
 1623                 /* NOTREACHED */
 1624 #else
 1625                 return EOPNOTSUPP;
 1626 #endif
 1627         }
 1628         if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
 1629                 return EINVAL;
 1630 
 1631         switch (cmd) {
 1632         case SIOCALIFADDR:
 1633             {
 1634                 struct in6_aliasreq ifra;
 1635                 struct in6_addr *hostid = NULL;
 1636                 int prefixlen;
 1637 
 1638                 ifa = NULL;
 1639                 if ((iflr->flags & IFLR_PREFIX) != 0) {
 1640                         struct sockaddr_in6 *sin6;
 1641 
 1642                         /*
 1643                          * hostid is to fill in the hostid part of the
 1644                          * address.  hostid points to the first link-local
 1645                          * address attached to the interface.
 1646                          */
 1647                         ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
 1648                         if (!ifa)
 1649                                 return EADDRNOTAVAIL;
 1650                         hostid = IFA_IN6(ifa);
 1651 
 1652                         /* prefixlen must be <= 64. */
 1653                         if (64 < iflr->prefixlen) {
 1654                                 if (ifa != NULL)
 1655                                         ifa_free(ifa);
 1656                                 return EINVAL;
 1657                         }
 1658                         prefixlen = iflr->prefixlen;
 1659 
 1660                         /* hostid part must be zero. */
 1661                         sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1662                         if (sin6->sin6_addr.s6_addr32[2] != 0 ||
 1663                             sin6->sin6_addr.s6_addr32[3] != 0) {
 1664                                 if (ifa != NULL)
 1665                                         ifa_free(ifa);
 1666                                 return EINVAL;
 1667                         }
 1668                 } else
 1669                         prefixlen = iflr->prefixlen;
 1670 
 1671                 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
 1672                 bzero(&ifra, sizeof(ifra));
 1673                 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
 1674 
 1675                 bcopy(&iflr->addr, &ifra.ifra_addr,
 1676                     ((struct sockaddr *)&iflr->addr)->sa_len);
 1677                 if (hostid) {
 1678                         /* fill in hostid part */
 1679                         ifra.ifra_addr.sin6_addr.s6_addr32[2] =
 1680                             hostid->s6_addr32[2];
 1681                         ifra.ifra_addr.sin6_addr.s6_addr32[3] =
 1682                             hostid->s6_addr32[3];
 1683                 }
 1684 
 1685                 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
 1686                         bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
 1687                             ((struct sockaddr *)&iflr->dstaddr)->sa_len);
 1688                         if (hostid) {
 1689                                 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
 1690                                     hostid->s6_addr32[2];
 1691                                 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
 1692                                     hostid->s6_addr32[3];
 1693                         }
 1694                 }
 1695                 if (ifa != NULL)
 1696                         ifa_free(ifa);
 1697 
 1698                 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
 1699                 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
 1700 
 1701                 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
 1702                 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
 1703             }
 1704         case SIOCGLIFADDR:
 1705         case SIOCDLIFADDR:
 1706             {
 1707                 struct in6_ifaddr *ia;
 1708                 struct in6_addr mask, candidate, match;
 1709                 struct sockaddr_in6 *sin6;
 1710                 int cmp;
 1711 
 1712                 bzero(&mask, sizeof(mask));
 1713                 if (iflr->flags & IFLR_PREFIX) {
 1714                         /* lookup a prefix rather than address. */
 1715                         in6_prefixlen2mask(&mask, iflr->prefixlen);
 1716 
 1717                         sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1718                         bcopy(&sin6->sin6_addr, &match, sizeof(match));
 1719                         match.s6_addr32[0] &= mask.s6_addr32[0];
 1720                         match.s6_addr32[1] &= mask.s6_addr32[1];
 1721                         match.s6_addr32[2] &= mask.s6_addr32[2];
 1722                         match.s6_addr32[3] &= mask.s6_addr32[3];
 1723 
 1724                         /* if you set extra bits, that's wrong */
 1725                         if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
 1726                                 return EINVAL;
 1727 
 1728                         cmp = 1;
 1729                 } else {
 1730                         if (cmd == SIOCGLIFADDR) {
 1731                                 /* on getting an address, take the 1st match */
 1732                                 cmp = 0;        /* XXX */
 1733                         } else {
 1734                                 /* on deleting an address, do exact match */
 1735                                 in6_prefixlen2mask(&mask, 128);
 1736                                 sin6 = (struct sockaddr_in6 *)&iflr->addr;
 1737                                 bcopy(&sin6->sin6_addr, &match, sizeof(match));
 1738 
 1739                                 cmp = 1;
 1740                         }
 1741                 }
 1742 
 1743                 IF_ADDR_RLOCK(ifp);
 1744                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1745                         if (ifa->ifa_addr->sa_family != AF_INET6)
 1746                                 continue;
 1747                         if (!cmp)
 1748                                 break;
 1749 
 1750                         /*
 1751                          * XXX: this is adhoc, but is necessary to allow
 1752                          * a user to specify fe80::/64 (not /10) for a
 1753                          * link-local address.
 1754                          */
 1755                         bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
 1756                         in6_clearscope(&candidate);
 1757                         candidate.s6_addr32[0] &= mask.s6_addr32[0];
 1758                         candidate.s6_addr32[1] &= mask.s6_addr32[1];
 1759                         candidate.s6_addr32[2] &= mask.s6_addr32[2];
 1760                         candidate.s6_addr32[3] &= mask.s6_addr32[3];
 1761                         if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
 1762                                 break;
 1763                 }
 1764                 if (ifa != NULL)
 1765                         ifa_ref(ifa);
 1766                 IF_ADDR_RUNLOCK(ifp);
 1767                 if (!ifa)
 1768                         return EADDRNOTAVAIL;
 1769                 ia = ifa2ia6(ifa);
 1770 
 1771                 if (cmd == SIOCGLIFADDR) {
 1772                         int error;
 1773 
 1774                         /* fill in the if_laddrreq structure */
 1775                         bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
 1776                         error = sa6_recoverscope(
 1777                             (struct sockaddr_in6 *)&iflr->addr);
 1778                         if (error != 0) {
 1779                                 ifa_free(ifa);
 1780                                 return (error);
 1781                         }
 1782 
 1783                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 1784                                 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
 1785                                     ia->ia_dstaddr.sin6_len);
 1786                                 error = sa6_recoverscope(
 1787                                     (struct sockaddr_in6 *)&iflr->dstaddr);
 1788                                 if (error != 0) {
 1789                                         ifa_free(ifa);
 1790                                         return (error);
 1791                                 }
 1792                         } else
 1793                                 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
 1794 
 1795                         iflr->prefixlen =
 1796                             in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
 1797 
 1798                         iflr->flags = ia->ia6_flags;    /* XXX */
 1799                         ifa_free(ifa);
 1800 
 1801                         return 0;
 1802                 } else {
 1803                         struct in6_aliasreq ifra;
 1804 
 1805                         /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
 1806                         bzero(&ifra, sizeof(ifra));
 1807                         bcopy(iflr->iflr_name, ifra.ifra_name,
 1808                             sizeof(ifra.ifra_name));
 1809 
 1810                         bcopy(&ia->ia_addr, &ifra.ifra_addr,
 1811                             ia->ia_addr.sin6_len);
 1812                         if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
 1813                                 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
 1814                                     ia->ia_dstaddr.sin6_len);
 1815                         } else {
 1816                                 bzero(&ifra.ifra_dstaddr,
 1817                                     sizeof(ifra.ifra_dstaddr));
 1818                         }
 1819                         bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
 1820                             ia->ia_prefixmask.sin6_len);
 1821 
 1822                         ifra.ifra_flags = ia->ia6_flags;
 1823                         ifa_free(ifa);
 1824                         return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
 1825                             ifp, td);
 1826                 }
 1827             }
 1828         }
 1829 
 1830         return EOPNOTSUPP;      /* just for safety */
 1831 }
 1832 
 1833 /*
 1834  * Initialize an interface's IPv6 address and routing table entry.
 1835  */
 1836 static int
 1837 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
 1838     struct sockaddr_in6 *sin6, int newhost)
 1839 {
 1840         int     error = 0, plen, ifacount = 0;
 1841         int     s = splimp();
 1842         struct ifaddr *ifa;
 1843 
 1844         /*
 1845          * Give the interface a chance to initialize
 1846          * if this is its first address,
 1847          * and to validate the address if necessary.
 1848          */
 1849         IF_ADDR_RLOCK(ifp);
 1850         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1851                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1852                         continue;
 1853                 ifacount++;
 1854         }
 1855         IF_ADDR_RUNLOCK(ifp);
 1856 
 1857         ia->ia_addr = *sin6;
 1858 
 1859         if (ifacount <= 1 && ifp->if_ioctl) {
 1860                 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
 1861                 if (error) {
 1862                         splx(s);
 1863                         return (error);
 1864                 }
 1865         }
 1866         splx(s);
 1867 
 1868         ia->ia_ifa.ifa_metric = ifp->if_metric;
 1869 
 1870         /* we could do in(6)_socktrim here, but just omit it at this moment. */
 1871 
 1872         /*
 1873          * Special case:
 1874          * If a new destination address is specified for a point-to-point
 1875          * interface, install a route to the destination as an interface
 1876          * direct route. 
 1877          * XXX: the logic below rejects assigning multiple addresses on a p2p
 1878          * interface that share the same destination.
 1879          */
 1880         plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
 1881         if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
 1882             ia->ia_dstaddr.sin6_family == AF_INET6) {
 1883                 int rtflags = RTF_UP | RTF_HOST;
 1884                 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
 1885                 if (error)
 1886                         return (error);
 1887                 ia->ia_flags |= IFA_ROUTE;
 1888                 /*
 1889                  * Handle the case for ::1 .
 1890                  */
 1891                 if (ifp->if_flags & IFF_LOOPBACK)
 1892                         ia->ia_flags |= IFA_RTSELF;
 1893         }
 1894 
 1895         /*
 1896          * add a loopback route to self
 1897          */
 1898         if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
 1899                 error = ifa_add_loopback_route((struct ifaddr *)ia,
 1900                                        (struct sockaddr *)&ia->ia_addr);
 1901                 if (error == 0)
 1902                         ia->ia_flags |= IFA_RTSELF;
 1903         }
 1904 
 1905         /* Add local address to lltable, if necessary (ex. on p2p link). */
 1906         if (newhost)
 1907                 in6_ifaddloop(&(ia->ia_ifa));
 1908 
 1909         return (error);
 1910 }
 1911 
 1912 /*
 1913  * Find an IPv6 interface link-local address specific to an interface.
 1914  * ifaddr is returned referenced.
 1915  */
 1916 struct in6_ifaddr *
 1917 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
 1918 {
 1919         struct ifaddr *ifa;
 1920 
 1921         IF_ADDR_RLOCK(ifp);
 1922         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1923                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1924                         continue;
 1925                 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
 1926                         if ((((struct in6_ifaddr *)ifa)->ia6_flags &
 1927                              ignoreflags) != 0)
 1928                                 continue;
 1929                         ifa_ref(ifa);
 1930                         break;
 1931                 }
 1932         }
 1933         IF_ADDR_RUNLOCK(ifp);
 1934 
 1935         return ((struct in6_ifaddr *)ifa);
 1936 }
 1937 
 1938 
 1939 /*
 1940  * find the internet address corresponding to a given interface and address.
 1941  * ifaddr is returned referenced.
 1942  */
 1943 struct in6_ifaddr *
 1944 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
 1945 {
 1946         struct ifaddr *ifa;
 1947 
 1948         IF_ADDR_RLOCK(ifp);
 1949         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 1950                 if (ifa->ifa_addr->sa_family != AF_INET6)
 1951                         continue;
 1952                 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
 1953                         ifa_ref(ifa);
 1954                         break;
 1955                 }
 1956         }
 1957         IF_ADDR_RUNLOCK(ifp);
 1958 
 1959         return ((struct in6_ifaddr *)ifa);
 1960 }
 1961 
 1962 /*
 1963  * Convert IP6 address to printable (loggable) representation. Caller
 1964  * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
 1965  */
 1966 static char digits[] = "0123456789abcdef";
 1967 char *
 1968 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
 1969 {
 1970         int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
 1971         char *cp;
 1972         const u_int16_t *a = (const u_int16_t *)addr;
 1973         const u_int8_t *d;
 1974         int dcolon = 0, zero = 0;
 1975 
 1976         cp = ip6buf;
 1977 
 1978         for (i = 0; i < 8; i++) {
 1979                 if (*(a + i) == 0) {
 1980                         cnt++;
 1981                         if (cnt == 1)
 1982                                 idx = i;
 1983                 }
 1984                 else if (maxcnt < cnt) {
 1985                         maxcnt = cnt;
 1986                         index = idx;
 1987                         cnt = 0;
 1988                 }
 1989         }
 1990         if (maxcnt < cnt) {
 1991                 maxcnt = cnt;
 1992                 index = idx;
 1993         }
 1994 
 1995         for (i = 0; i < 8; i++) {
 1996                 if (dcolon == 1) {
 1997                         if (*a == 0) {
 1998                                 if (i == 7)
 1999                                         *cp++ = ':';
 2000                                 a++;
 2001                                 continue;
 2002                         } else
 2003                                 dcolon = 2;
 2004                 }
 2005                 if (*a == 0) {
 2006                         if (dcolon == 0 && *(a + 1) == 0 && i == index) {
 2007                                 if (i == 0)
 2008                                         *cp++ = ':';
 2009                                 *cp++ = ':';
 2010                                 dcolon = 1;
 2011                         } else {
 2012                                 *cp++ = '';
 2013                                 *cp++ = ':';
 2014                         }
 2015                         a++;
 2016                         continue;
 2017                 }
 2018                 d = (const u_char *)a;
 2019                 /* Try to eliminate leading zeros in printout like in :0001. */
 2020                 zero = 1;
 2021                 *cp = digits[*d >> 4];
 2022                 if (*cp != '') {
 2023                         zero = 0;
 2024                         cp++;
 2025                 }
 2026                 *cp = digits[*d++ & 0xf];
 2027                 if (zero == 0 || (*cp != '')) {
 2028                         zero = 0;
 2029                         cp++;
 2030                 }
 2031                 *cp = digits[*d >> 4];
 2032                 if (zero == 0 || (*cp != '')) {
 2033                         zero = 0;
 2034                         cp++;
 2035                 }
 2036                 *cp++ = digits[*d & 0xf];
 2037                 *cp++ = ':';
 2038                 a++;
 2039         }
 2040         *--cp = '\0';
 2041         return (ip6buf);
 2042 }
 2043 
 2044 int
 2045 in6_localaddr(struct in6_addr *in6)
 2046 {
 2047         struct in6_ifaddr *ia;
 2048 
 2049         if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
 2050                 return 1;
 2051 
 2052         IN6_IFADDR_RLOCK();
 2053         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 2054                 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
 2055                     &ia->ia_prefixmask.sin6_addr)) {
 2056                         IN6_IFADDR_RUNLOCK();
 2057                         return 1;
 2058                 }
 2059         }
 2060         IN6_IFADDR_RUNLOCK();
 2061 
 2062         return (0);
 2063 }
 2064 
 2065 /*
 2066  * Return 1 if an internet address is for the local host and configured
 2067  * on one of its interfaces.
 2068  */
 2069 int
 2070 in6_localip(struct in6_addr *in6)
 2071 {
 2072         struct in6_ifaddr *ia;
 2073 
 2074         IN6_IFADDR_RLOCK();
 2075         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 2076                 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
 2077                         IN6_IFADDR_RUNLOCK();
 2078                         return (1);
 2079                 }
 2080         }
 2081         IN6_IFADDR_RUNLOCK();
 2082         return (0);
 2083 }
 2084 
 2085 
 2086 int
 2087 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
 2088 {
 2089         struct in6_ifaddr *ia;
 2090 
 2091         IN6_IFADDR_RLOCK();
 2092         TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
 2093                 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
 2094                                        &sa6->sin6_addr) &&
 2095                     (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) {
 2096                         IN6_IFADDR_RUNLOCK();
 2097                         return (1); /* true */
 2098                 }
 2099 
 2100                 /* XXX: do we still have to go thru the rest of the list? */
 2101         }
 2102         IN6_IFADDR_RUNLOCK();
 2103 
 2104         return (0);             /* false */
 2105 }
 2106 
 2107 /*
 2108  * return length of part which dst and src are equal
 2109  * hard coding...
 2110  */
 2111 int
 2112 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
 2113 {
 2114         int match = 0;
 2115         u_char *s = (u_char *)src, *d = (u_char *)dst;
 2116         u_char *lim = s + 16, r;
 2117 
 2118         while (s < lim)
 2119                 if ((r = (*d++ ^ *s++)) != 0) {
 2120                         while (r < 128) {
 2121                                 match++;
 2122                                 r <<= 1;
 2123                         }
 2124                         break;
 2125                 } else
 2126                         match += 8;
 2127         return match;
 2128 }
 2129 
 2130 /* XXX: to be scope conscious */
 2131 int
 2132 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
 2133 {
 2134         int bytelen, bitlen;
 2135 
 2136         /* sanity check */
 2137         if (0 > len || len > 128) {
 2138                 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
 2139                     len);
 2140                 return (0);
 2141         }
 2142 
 2143         bytelen = len / 8;
 2144         bitlen = len % 8;
 2145 
 2146         if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
 2147                 return (0);
 2148         if (bitlen != 0 &&
 2149             p1->s6_addr[bytelen] >> (8 - bitlen) !=
 2150             p2->s6_addr[bytelen] >> (8 - bitlen))
 2151                 return (0);
 2152 
 2153         return (1);
 2154 }
 2155 
 2156 void
 2157 in6_prefixlen2mask(struct in6_addr *maskp, int len)
 2158 {
 2159         u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
 2160         int bytelen, bitlen, i;
 2161 
 2162         /* sanity check */
 2163         if (0 > len || len > 128) {
 2164                 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
 2165                     len);
 2166                 return;
 2167         }
 2168 
 2169         bzero(maskp, sizeof(*maskp));
 2170         bytelen = len / 8;
 2171         bitlen = len % 8;
 2172         for (i = 0; i < bytelen; i++)
 2173                 maskp->s6_addr[i] = 0xff;
 2174         if (bitlen)
 2175                 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
 2176 }
 2177 
 2178 /*
 2179  * return the best address out of the same scope. if no address was
 2180  * found, return the first valid address from designated IF.
 2181  */
 2182 struct in6_ifaddr *
 2183 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
 2184 {
 2185         int dst_scope = in6_addrscope(dst), blen = -1, tlen;
 2186         struct ifaddr *ifa;
 2187         struct in6_ifaddr *besta = 0;
 2188         struct in6_ifaddr *dep[2];      /* last-resort: deprecated */
 2189 
 2190         dep[0] = dep[1] = NULL;
 2191 
 2192         /*
 2193          * We first look for addresses in the same scope.
 2194          * If there is one, return it.
 2195          * If two or more, return one which matches the dst longest.
 2196          * If none, return one of global addresses assigned other ifs.
 2197          */
 2198         IF_ADDR_RLOCK(ifp);
 2199         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 2200                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2201                         continue;
 2202                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 2203                         continue; /* XXX: is there any case to allow anycast? */
 2204                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 2205                         continue; /* don't use this interface */
 2206                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 2207                         continue;
 2208                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 2209                         if (V_ip6_use_deprecated)
 2210                                 dep[0] = (struct in6_ifaddr *)ifa;
 2211                         continue;
 2212                 }
 2213 
 2214                 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
 2215                         /*
 2216                          * call in6_matchlen() as few as possible
 2217                          */
 2218                         if (besta) {
 2219                                 if (blen == -1)
 2220                                         blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
 2221                                 tlen = in6_matchlen(IFA_IN6(ifa), dst);
 2222                                 if (tlen > blen) {
 2223                                         blen = tlen;
 2224                                         besta = (struct in6_ifaddr *)ifa;
 2225                                 }
 2226                         } else
 2227                                 besta = (struct in6_ifaddr *)ifa;
 2228                 }
 2229         }
 2230         if (besta) {
 2231                 ifa_ref(&besta->ia_ifa);
 2232                 IF_ADDR_RUNLOCK(ifp);
 2233                 return (besta);
 2234         }
 2235 
 2236         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 2237                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2238                         continue;
 2239                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
 2240                         continue; /* XXX: is there any case to allow anycast? */
 2241                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
 2242                         continue; /* don't use this interface */
 2243                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
 2244                         continue;
 2245                 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
 2246                         if (V_ip6_use_deprecated)
 2247                                 dep[1] = (struct in6_ifaddr *)ifa;
 2248                         continue;
 2249                 }
 2250 
 2251                 if (ifa != NULL)
 2252                         ifa_ref(ifa);
 2253                 IF_ADDR_RUNLOCK(ifp);
 2254                 return (struct in6_ifaddr *)ifa;
 2255         }
 2256 
 2257         /* use the last-resort values, that are, deprecated addresses */
 2258         if (dep[0]) {
 2259                 ifa_ref((struct ifaddr *)dep[0]);
 2260                 IF_ADDR_RUNLOCK(ifp);
 2261                 return dep[0];
 2262         }
 2263         if (dep[1]) {
 2264                 ifa_ref((struct ifaddr *)dep[1]);
 2265                 IF_ADDR_RUNLOCK(ifp);
 2266                 return dep[1];
 2267         }
 2268 
 2269         IF_ADDR_RUNLOCK(ifp);
 2270         return NULL;
 2271 }
 2272 
 2273 /*
 2274  * perform DAD when interface becomes IFF_UP.
 2275  */
 2276 void
 2277 in6_if_up(struct ifnet *ifp)
 2278 {
 2279         struct ifaddr *ifa;
 2280         struct in6_ifaddr *ia;
 2281 
 2282         IF_ADDR_RLOCK(ifp);
 2283         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 2284                 if (ifa->ifa_addr->sa_family != AF_INET6)
 2285                         continue;
 2286                 ia = (struct in6_ifaddr *)ifa;
 2287                 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
 2288                         /*
 2289                          * The TENTATIVE flag was likely set by hand
 2290                          * beforehand, implicitly indicating the need for DAD.
 2291                          * We may be able to skip the random delay in this
 2292                          * case, but we impose delays just in case.
 2293                          */
 2294                         nd6_dad_start(ifa,
 2295                             arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
 2296                 }
 2297         }
 2298         IF_ADDR_RUNLOCK(ifp);
 2299 
 2300         /*
 2301          * special cases, like 6to4, are handled in in6_ifattach
 2302          */
 2303         in6_ifattach(ifp, NULL);
 2304 }
 2305 
 2306 int
 2307 in6if_do_dad(struct ifnet *ifp)
 2308 {
 2309         if ((ifp->if_flags & IFF_LOOPBACK) != 0)
 2310                 return (0);
 2311 
 2312         if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
 2313                 return (0);
 2314 
 2315         switch (ifp->if_type) {
 2316 #ifdef IFT_DUMMY
 2317         case IFT_DUMMY:
 2318 #endif
 2319         case IFT_FAITH:
 2320                 /*
 2321                  * These interfaces do not have the IFF_LOOPBACK flag,
 2322                  * but loop packets back.  We do not have to do DAD on such
 2323                  * interfaces.  We should even omit it, because loop-backed
 2324                  * NS would confuse the DAD procedure.
 2325                  */
 2326                 return (0);
 2327         default:
 2328                 /*
 2329                  * Our DAD routine requires the interface up and running.
 2330                  * However, some interfaces can be up before the RUNNING
 2331                  * status.  Additionaly, users may try to assign addresses
 2332                  * before the interface becomes up (or running).
 2333                  * We simply skip DAD in such a case as a work around.
 2334                  * XXX: we should rather mark "tentative" on such addresses,
 2335                  * and do DAD after the interface becomes ready.
 2336                  */
 2337                 if (!((ifp->if_flags & IFF_UP) &&
 2338                     (ifp->if_drv_flags & IFF_DRV_RUNNING)))
 2339                         return (0);
 2340 
 2341                 return (1);
 2342         }
 2343 }
 2344 
 2345 /*
 2346  * Calculate max IPv6 MTU through all the interfaces and store it
 2347  * to in6_maxmtu.
 2348  */
 2349 void
 2350 in6_setmaxmtu(void)
 2351 {
 2352         unsigned long maxmtu = 0;
 2353         struct ifnet *ifp;
 2354 
 2355         IFNET_RLOCK_NOSLEEP();
 2356         TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
 2357                 /* this function can be called during ifnet initialization */
 2358                 if (!ifp->if_afdata[AF_INET6])
 2359                         continue;
 2360                 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
 2361                     IN6_LINKMTU(ifp) > maxmtu)
 2362                         maxmtu = IN6_LINKMTU(ifp);
 2363         }
 2364         IFNET_RUNLOCK_NOSLEEP();
 2365         if (maxmtu)          /* update only when maxmtu is positive */
 2366                 V_in6_maxmtu = maxmtu;
 2367 }
 2368 
 2369 /*
 2370  * Provide the length of interface identifiers to be used for the link attached
 2371  * to the given interface.  The length should be defined in "IPv6 over
 2372  * xxx-link" document.  Note that address architecture might also define
 2373  * the length for a particular set of address prefixes, regardless of the
 2374  * link type.  As clarified in rfc2462bis, those two definitions should be
 2375  * consistent, and those really are as of August 2004.
 2376  */
 2377 int
 2378 in6_if2idlen(struct ifnet *ifp)
 2379 {
 2380         switch (ifp->if_type) {
 2381         case IFT_ETHER:         /* RFC2464 */
 2382 #ifdef IFT_PROPVIRTUAL
 2383         case IFT_PROPVIRTUAL:   /* XXX: no RFC. treat it as ether */
 2384 #endif
 2385 #ifdef IFT_L2VLAN
 2386         case IFT_L2VLAN:        /* ditto */
 2387 #endif
 2388 #ifdef IFT_IEEE80211
 2389         case IFT_IEEE80211:     /* ditto */
 2390 #endif
 2391 #ifdef IFT_MIP
 2392         case IFT_MIP:   /* ditto */
 2393 #endif
 2394         case IFT_INFINIBAND:
 2395                 return (64);
 2396         case IFT_FDDI:          /* RFC2467 */
 2397                 return (64);
 2398         case IFT_ISO88025:      /* RFC2470 (IPv6 over Token Ring) */
 2399                 return (64);
 2400         case IFT_PPP:           /* RFC2472 */
 2401                 return (64);
 2402         case IFT_ARCNET:        /* RFC2497 */
 2403                 return (64);
 2404         case IFT_FRELAY:        /* RFC2590 */
 2405                 return (64);
 2406         case IFT_IEEE1394:      /* RFC3146 */
 2407                 return (64);
 2408         case IFT_GIF:
 2409                 return (64);    /* draft-ietf-v6ops-mech-v2-07 */
 2410         case IFT_LOOP:
 2411                 return (64);    /* XXX: is this really correct? */
 2412         default:
 2413                 /*
 2414                  * Unknown link type:
 2415                  * It might be controversial to use the today's common constant
 2416                  * of 64 for these cases unconditionally.  For full compliance,
 2417                  * we should return an error in this case.  On the other hand,
 2418                  * if we simply miss the standard for the link type or a new
 2419                  * standard is defined for a new link type, the IFID length
 2420                  * is very likely to be the common constant.  As a compromise,
 2421                  * we always use the constant, but make an explicit notice
 2422                  * indicating the "unknown" case.
 2423                  */
 2424                 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
 2425                 return (64);
 2426         }
 2427 }
 2428 
 2429 #include <sys/sysctl.h>
 2430 
 2431 struct in6_llentry {
 2432         struct llentry          base;
 2433         struct sockaddr_in6     l3_addr6;
 2434 };
 2435 
 2436 static struct llentry *
 2437 in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
 2438 {
 2439         struct in6_llentry *lle;
 2440 
 2441         lle = malloc(sizeof(struct in6_llentry), M_LLTABLE,
 2442             M_DONTWAIT | M_ZERO);
 2443         if (lle == NULL)                /* NB: caller generates msg */
 2444                 return NULL;
 2445 
 2446         lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
 2447         lle->base.lle_refcnt = 1;
 2448         LLE_LOCK_INIT(&lle->base);
 2449         callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock,
 2450             CALLOUT_RETURNUNLOCKED);
 2451 
 2452         return &lle->base;
 2453 }
 2454 
 2455 /*
 2456  * Deletes an address from the address table.
 2457  * This function is called by the timer functions
 2458  * such as arptimer() and nd6_llinfo_timer(), and
 2459  * the caller does the locking.
 2460  */
 2461 static void
 2462 in6_lltable_free(struct lltable *llt, struct llentry *lle)
 2463 {
 2464         LLE_WUNLOCK(lle);
 2465         LLE_LOCK_DESTROY(lle);
 2466         free(lle, M_LLTABLE);
 2467 }
 2468 
 2469 static void
 2470 in6_lltable_prefix_free(struct lltable *llt, 
 2471                         const struct sockaddr *prefix,
 2472                         const struct sockaddr *mask,
 2473                         u_int flags)
 2474 {
 2475         const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
 2476         const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
 2477         struct llentry *lle, *next;
 2478         register int i;
 2479 
 2480         /*
 2481          * (flags & LLE_STATIC) means deleting all entries 
 2482          * including static ND6 entries
 2483          */
 2484         for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
 2485                 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
 2486                         if (IN6_ARE_MASKED_ADDR_EQUAL(
 2487                                     &((struct sockaddr_in6 *)L3_ADDR(lle))->sin6_addr, 
 2488                                     &pfx->sin6_addr, 
 2489                                     &msk->sin6_addr) &&
 2490                             ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) {
 2491                                 int canceled;
 2492 
 2493                                 canceled = callout_drain(&lle->la_timer);
 2494                                 LLE_WLOCK(lle);
 2495                                 if (canceled)
 2496                                         LLE_REMREF(lle);
 2497                                 llentry_free(lle);
 2498                         }
 2499                 }
 2500         }
 2501 }
 2502 
 2503 static int
 2504 in6_lltable_rtcheck(struct ifnet *ifp, 
 2505                     u_int flags, 
 2506                     const struct sockaddr *l3addr)
 2507 {
 2508         struct rtentry *rt;
 2509         char ip6buf[INET6_ADDRSTRLEN];
 2510 
 2511         KASSERT(l3addr->sa_family == AF_INET6,
 2512             ("sin_family %d", l3addr->sa_family));
 2513 
 2514         /* Our local addresses are always only installed on the default FIB. */
 2515         /* XXX rtalloc1 should take a const param */
 2516         rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0,
 2517             RT_DEFAULT_FIB);
 2518         if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
 2519                 struct ifaddr *ifa;
 2520                 /* 
 2521                  * Create an ND6 cache for an IPv6 neighbor 
 2522                  * that is not covered by our own prefix.
 2523                  */
 2524                 /* XXX ifaof_ifpforaddr should take a const param */
 2525                 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
 2526                 if (ifa != NULL) {
 2527                         ifa_free(ifa);
 2528                         if (rt != NULL)
 2529                                 RTFREE_LOCKED(rt);
 2530                         return 0;
 2531                 }
 2532                 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
 2533                     ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
 2534                 if (rt != NULL)
 2535                         RTFREE_LOCKED(rt);
 2536                 return EINVAL;
 2537         }
 2538         RTFREE_LOCKED(rt);
 2539         return 0;
 2540 }
 2541 
 2542 static struct llentry *
 2543 in6_lltable_lookup(struct lltable *llt, u_int flags,
 2544         const struct sockaddr *l3addr)
 2545 {
 2546         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
 2547         struct ifnet *ifp = llt->llt_ifp;
 2548         struct llentry *lle;
 2549         struct llentries *lleh;
 2550         u_int hashkey;
 2551 
 2552         IF_AFDATA_LOCK_ASSERT(ifp);
 2553         KASSERT(l3addr->sa_family == AF_INET6,
 2554             ("sin_family %d", l3addr->sa_family));
 2555 
 2556         hashkey = sin6->sin6_addr.s6_addr32[3];
 2557         lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
 2558         LIST_FOREACH(lle, lleh, lle_next) {
 2559                 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
 2560                 if (lle->la_flags & LLE_DELETED)
 2561                         continue;
 2562                 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 
 2563                          sizeof(struct in6_addr)) == 0)
 2564                         break;
 2565         }
 2566 
 2567         if (lle == NULL) {
 2568                 if (!(flags & LLE_CREATE))
 2569                         return (NULL);
 2570                 /*
 2571                  * A route that covers the given address must have
 2572                  * been installed 1st because we are doing a resolution,
 2573                  * verify this.
 2574                  */
 2575                 if (!(flags & LLE_IFADDR) &&
 2576                     in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
 2577                         return NULL;
 2578 
 2579                 lle = in6_lltable_new(l3addr, flags);
 2580                 if (lle == NULL) {
 2581                         log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
 2582                         return NULL;
 2583                 }
 2584                 lle->la_flags = flags & ~LLE_CREATE;
 2585                 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
 2586                         bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
 2587                         lle->la_flags |= (LLE_VALID | LLE_STATIC);
 2588                 }
 2589 
 2590                 lle->lle_tbl  = llt;
 2591                 lle->lle_head = lleh;
 2592                 LIST_INSERT_HEAD(lleh, lle, lle_next);
 2593         } else if (flags & LLE_DELETE) {
 2594                 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
 2595                         LLE_WLOCK(lle);
 2596                         lle->la_flags = LLE_DELETED;
 2597                         LLE_WUNLOCK(lle);
 2598 #ifdef DIAGNOSTIC
 2599                         log(LOG_INFO, "ifaddr cache = %p  is deleted\n", lle);  
 2600 #endif  
 2601                 }
 2602                 lle = (void *)-1;
 2603         }
 2604         if (LLE_IS_VALID(lle)) {
 2605                 if (flags & LLE_EXCLUSIVE)
 2606                         LLE_WLOCK(lle);
 2607                 else
 2608                         LLE_RLOCK(lle);
 2609         }
 2610         return (lle);
 2611 }
 2612 
 2613 static int
 2614 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
 2615 {
 2616         struct ifnet *ifp = llt->llt_ifp;
 2617         struct llentry *lle;
 2618         /* XXX stack use */
 2619         struct {
 2620                 struct rt_msghdr        rtm;
 2621                 struct sockaddr_in6     sin6;
 2622                 /*
 2623                  * ndp.c assumes that sdl is word aligned
 2624                  */
 2625 #ifdef __LP64__
 2626                 uint32_t                pad;
 2627 #endif
 2628                 struct sockaddr_dl      sdl;
 2629         } ndpc;
 2630         int i, error;
 2631 
 2632         if (ifp->if_flags & IFF_LOOPBACK)
 2633                 return 0;
 2634 
 2635         LLTABLE_LOCK_ASSERT();
 2636 
 2637         error = 0;
 2638         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
 2639                 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
 2640                         struct sockaddr_dl *sdl;
 2641 
 2642                         /* skip deleted or invalid entries */
 2643                         if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
 2644                                 continue;
 2645                         /* Skip if jailed and not a valid IP of the prison. */
 2646                         if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
 2647                                 continue;
 2648                         /*
 2649                          * produce a msg made of:
 2650                          *  struct rt_msghdr;
 2651                          *  struct sockaddr_in6 (IPv6)
 2652                          *  struct sockaddr_dl;
 2653                          */
 2654                         bzero(&ndpc, sizeof(ndpc));
 2655                         ndpc.rtm.rtm_msglen = sizeof(ndpc);
 2656                         ndpc.rtm.rtm_version = RTM_VERSION;
 2657                         ndpc.rtm.rtm_type = RTM_GET;
 2658                         ndpc.rtm.rtm_flags = RTF_UP;
 2659                         ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
 2660                         ndpc.sin6.sin6_family = AF_INET6;
 2661                         ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
 2662                         bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
 2663 
 2664                         /* publish */
 2665                         if (lle->la_flags & LLE_PUB)
 2666                                 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
 2667 
 2668                         sdl = &ndpc.sdl;
 2669                         sdl->sdl_family = AF_LINK;
 2670                         sdl->sdl_len = sizeof(*sdl);
 2671                         sdl->sdl_alen = ifp->if_addrlen;
 2672                         sdl->sdl_index = ifp->if_index;
 2673                         sdl->sdl_type = ifp->if_type;
 2674                         bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
 2675                         ndpc.rtm.rtm_rmx.rmx_expire =
 2676                             lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
 2677                         ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
 2678                         if (lle->la_flags & LLE_STATIC)
 2679                                 ndpc.rtm.rtm_flags |= RTF_STATIC;
 2680                         ndpc.rtm.rtm_index = ifp->if_index;
 2681                         error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
 2682                         if (error)
 2683                                 break;
 2684                 }
 2685         }
 2686         return error;
 2687 }
 2688 
 2689 void *
 2690 in6_domifattach(struct ifnet *ifp)
 2691 {
 2692         struct in6_ifextra *ext;
 2693 
 2694         ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
 2695         bzero(ext, sizeof(*ext));
 2696 
 2697         ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
 2698             M_IFADDR, M_WAITOK);
 2699         bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
 2700 
 2701         ext->icmp6_ifstat =
 2702             (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
 2703             M_IFADDR, M_WAITOK);
 2704         bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
 2705 
 2706         ext->nd_ifinfo = nd6_ifattach(ifp);
 2707         ext->scope6_id = scope6_ifattach(ifp);
 2708         ext->lltable = lltable_init(ifp, AF_INET6);
 2709         if (ext->lltable != NULL) {
 2710                 ext->lltable->llt_free = in6_lltable_free;
 2711                 ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
 2712                 ext->lltable->llt_lookup = in6_lltable_lookup;
 2713                 ext->lltable->llt_dump = in6_lltable_dump;
 2714         }
 2715 
 2716         ext->mld_ifinfo = mld_domifattach(ifp);
 2717 
 2718         return ext;
 2719 }
 2720 
 2721 void
 2722 in6_domifdetach(struct ifnet *ifp, void *aux)
 2723 {
 2724         struct in6_ifextra *ext = (struct in6_ifextra *)aux;
 2725 
 2726         mld_domifdetach(ifp);
 2727         scope6_ifdetach(ext->scope6_id);
 2728         nd6_ifdetach(ext->nd_ifinfo);
 2729         lltable_free(ext->lltable);
 2730         free(ext->in6_ifstat, M_IFADDR);
 2731         free(ext->icmp6_ifstat, M_IFADDR);
 2732         free(ext, M_IFADDR);
 2733 }
 2734 
 2735 /*
 2736  * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
 2737  * v4 mapped addr or v4 compat addr
 2738  */
 2739 void
 2740 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2741 {
 2742 
 2743         bzero(sin, sizeof(*sin));
 2744         sin->sin_len = sizeof(struct sockaddr_in);
 2745         sin->sin_family = AF_INET;
 2746         sin->sin_port = sin6->sin6_port;
 2747         sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
 2748 }
 2749 
 2750 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
 2751 void
 2752 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
 2753 {
 2754         bzero(sin6, sizeof(*sin6));
 2755         sin6->sin6_len = sizeof(struct sockaddr_in6);
 2756         sin6->sin6_family = AF_INET6;
 2757         sin6->sin6_port = sin->sin_port;
 2758         sin6->sin6_addr.s6_addr32[0] = 0;
 2759         sin6->sin6_addr.s6_addr32[1] = 0;
 2760         sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
 2761         sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
 2762 }
 2763 
 2764 /* Convert sockaddr_in6 into sockaddr_in. */
 2765 void
 2766 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
 2767 {
 2768         struct sockaddr_in *sin_p;
 2769         struct sockaddr_in6 sin6;
 2770 
 2771         /*
 2772          * Save original sockaddr_in6 addr and convert it
 2773          * to sockaddr_in.
 2774          */
 2775         sin6 = *(struct sockaddr_in6 *)nam;
 2776         sin_p = (struct sockaddr_in *)nam;
 2777         in6_sin6_2_sin(sin_p, &sin6);
 2778 }
 2779 
 2780 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
 2781 void
 2782 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
 2783 {
 2784         struct sockaddr_in *sin_p;
 2785         struct sockaddr_in6 *sin6_p;
 2786 
 2787         sin6_p = malloc(sizeof *sin6_p, M_SONAME,
 2788                M_WAITOK);
 2789         sin_p = (struct sockaddr_in *)*nam;
 2790         in6_sin_2_v4mapsin6(sin_p, sin6_p);
 2791         free(*nam, M_SONAME);
 2792         *nam = (struct sockaddr *)sin6_p;
 2793 }

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