Move files to match FreeBSD layout

1 files changed, 2671 insertions, 0 deletions

diff --git a/freebsd/sys/netinet6/in6.c b/freebsd/sys/netinet6/in6.c
new file mode 100644
index 00000000..826213af
--- /dev/null
+++ b/freebsd/sys/netinet6/in6.c
@@ -0,0 +1,2671 @@
+#include <freebsd/machine/rtems-bsd-config.h>
+
+/*-
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	$KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
+ */
+
+/*-
+ * Copyright (c) 1982, 1986, 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)in.c	8.2 (Berkeley) 11/15/93
+ */
+
+#include <freebsd/sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <freebsd/local/opt_compat.h>
+#include <freebsd/local/opt_inet.h>
+#include <freebsd/local/opt_inet6.h>
+
+#include <freebsd/sys/param.h>
+#include <freebsd/sys/errno.h>
+#include <freebsd/sys/jail.h>
+#include <freebsd/sys/malloc.h>
+#include <freebsd/sys/socket.h>
+#include <freebsd/sys/socketvar.h>
+#include <freebsd/sys/sockio.h>
+#include <freebsd/sys/systm.h>
+#include <freebsd/sys/priv.h>
+#include <freebsd/sys/proc.h>
+#include <freebsd/sys/time.h>
+#include <freebsd/sys/kernel.h>
+#include <freebsd/sys/syslog.h>
+
+#include <freebsd/net/if.h>
+#include <freebsd/net/if_var.h>
+#include <freebsd/net/if_types.h>
+#include <freebsd/net/route.h>
+#include <freebsd/net/if_dl.h>
+#include <freebsd/net/vnet.h>
+
+#include <freebsd/netinet/in.h>
+#include <freebsd/netinet/in_var.h>
+#include <freebsd/net/if_llatbl.h>
+#include <freebsd/netinet/if_ether.h>
+#include <freebsd/netinet/in_systm.h>
+#include <freebsd/netinet/ip.h>
+#include <freebsd/netinet/in_pcb.h>
+
+#include <freebsd/netinet/ip6.h>
+#include <freebsd/netinet6/ip6_var.h>
+#include <freebsd/netinet6/nd6.h>
+#include <freebsd/netinet6/mld6_var.h>
+#include <freebsd/netinet6/ip6_mroute.h>
+#include <freebsd/netinet6/in6_ifattach.h>
+#include <freebsd/netinet6/scope6_var.h>
+#include <freebsd/netinet6/in6_pcb.h>
+
+/*
+ * Definitions of some costant IP6 addresses.
+ */
+const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
+const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
+const struct in6_addr in6addr_nodelocal_allnodes =
+	IN6ADDR_NODELOCAL_ALLNODES_INIT;
+const struct in6_addr in6addr_linklocal_allnodes =
+	IN6ADDR_LINKLOCAL_ALLNODES_INIT;
+const struct in6_addr in6addr_linklocal_allrouters =
+	IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
+const struct in6_addr in6addr_linklocal_allv2routers =
+	IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
+
+const struct in6_addr in6mask0 = IN6MASK0;
+const struct in6_addr in6mask32 = IN6MASK32;
+const struct in6_addr in6mask64 = IN6MASK64;
+const struct in6_addr in6mask96 = IN6MASK96;
+const struct in6_addr in6mask128 = IN6MASK128;
+
+const struct sockaddr_in6 sa6_any =
+	{ sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
+
+static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
+	struct ifnet *, struct thread *));
+static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *,
+	struct sockaddr_in6 *, int));
+static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
+
+int	(*faithprefix_p)(struct in6_addr *);
+
+
+
+int
+in6_mask2len(struct in6_addr *mask, u_char *lim0)
+{
+	int x = 0, y;
+	u_char *lim = lim0, *p;
+
+	/* ignore the scope_id part */
+	if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
+		lim = (u_char *)mask + sizeof(*mask);
+	for (p = (u_char *)mask; p < lim; x++, p++) {
+		if (*p != 0xff)
+			break;
+	}
+	y = 0;
+	if (p < lim) {
+		for (y = 0; y < 8; y++) {
+			if ((*p & (0x80 >> y)) == 0)
+				break;
+		}
+	}
+
+	/*
+	 * when the limit pointer is given, do a stricter check on the
+	 * remaining bits.
+	 */
+	if (p < lim) {
+		if (y != 0 && (*p & (0x00ff >> y)) != 0)
+			return (-1);
+		for (p = p + 1; p < lim; p++)
+			if (*p != 0)
+				return (-1);
+	}
+
+	return x * 8 + y;
+}
+
+#define ifa2ia6(ifa)	((struct in6_ifaddr *)(ifa))
+#define ia62ifa(ia6)	(&((ia6)->ia_ifa))
+
+#ifdef COMPAT_FREEBSD32
+struct in6_ndifreq32 {
+        char ifname[IFNAMSIZ];
+        uint32_t ifindex;
+};
+#define	SIOCGDEFIFACE32_IN6     _IOWR('i', 86, struct in6_ndifreq32)
+#endif
+
+int
+in6_control(struct socket *so, u_long cmd, caddr_t data,
+    struct ifnet *ifp, struct thread *td)
+{
+	struct	in6_ifreq *ifr = (struct in6_ifreq *)data;
+	struct	in6_ifaddr *ia = NULL;
+	struct	in6_aliasreq *ifra = (struct in6_aliasreq *)data;
+	struct sockaddr_in6 *sa6;
+	int error;
+
+	switch (cmd) {
+	case SIOCGETSGCNT_IN6:
+	case SIOCGETMIFCNT_IN6:
+		return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
+	}
+
+	switch(cmd) {
+	case SIOCAADDRCTL_POLICY:
+	case SIOCDADDRCTL_POLICY:
+		if (td != NULL) {
+			error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
+			if (error)
+				return (error);
+		}
+		return (in6_src_ioctl(cmd, data));
+	}
+
+	if (ifp == NULL)
+		return (EOPNOTSUPP);
+
+	switch (cmd) {
+	case SIOCSNDFLUSH_IN6:
+	case SIOCSPFXFLUSH_IN6:
+	case SIOCSRTRFLUSH_IN6:
+	case SIOCSDEFIFACE_IN6:
+	case SIOCSIFINFO_FLAGS:
+	case SIOCSIFINFO_IN6:
+		if (td != NULL) {
+			error = priv_check(td, PRIV_NETINET_ND6);
+			if (error)
+				return (error);
+		}
+		/* FALLTHROUGH */
+	case OSIOCGIFINFO_IN6:
+	case SIOCGIFINFO_IN6:
+	case SIOCGDRLST_IN6:
+	case SIOCGPRLST_IN6:
+	case SIOCGNBRINFO_IN6:
+	case SIOCGDEFIFACE_IN6:
+		return (nd6_ioctl(cmd, data, ifp));
+
+#ifdef COMPAT_FREEBSD32
+	case SIOCGDEFIFACE32_IN6:
+		{
+			struct in6_ndifreq ndif;
+			struct in6_ndifreq32 *ndif32;
+
+			error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
+			    ifp);
+			if (error)
+				return (error);
+			ndif32 = (struct in6_ndifreq32 *)data;
+			ndif32->ifindex = ndif.ifindex;
+			return (0);
+		}
+#endif
+	}
+
+	switch (cmd) {
+	case SIOCSIFPREFIX_IN6:
+	case SIOCDIFPREFIX_IN6:
+	case SIOCAIFPREFIX_IN6:
+	case SIOCCIFPREFIX_IN6:
+	case SIOCSGIFPREFIX_IN6:
+	case SIOCGIFPREFIX_IN6:
+		log(LOG_NOTICE,
+		    "prefix ioctls are now invalidated. "
+		    "please use ifconfig.\n");
+		return (EOPNOTSUPP);
+	}
+
+	switch (cmd) {
+	case SIOCSSCOPE6:
+		if (td != NULL) {
+			error = priv_check(td, PRIV_NETINET_SCOPE6);
+			if (error)
+				return (error);
+		}
+		return (scope6_set(ifp,
+		    (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
+	case SIOCGSCOPE6:
+		return (scope6_get(ifp,
+		    (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
+	case SIOCGSCOPE6DEF:
+		return (scope6_get_default((struct scope6_id *)
+		    ifr->ifr_ifru.ifru_scope_id));
+	}
+
+	switch (cmd) {
+	case SIOCALIFADDR:
+		if (td != NULL) {
+			error = priv_check(td, PRIV_NET_ADDIFADDR);
+			if (error)
+				return (error);
+		}
+		return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
+
+	case SIOCDLIFADDR:
+		if (td != NULL) {
+			error = priv_check(td, PRIV_NET_DELIFADDR);
+			if (error)
+				return (error);
+		}
+		/* FALLTHROUGH */
+	case SIOCGLIFADDR:
+		return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
+	}
+
+	/*
+	 * Find address for this interface, if it exists.
+	 *
+	 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
+	 * only, and used the first interface address as the target of other
+	 * operations (without checking ifra_addr).  This was because netinet
+	 * code/API assumed at most 1 interface address per interface.
+	 * Since IPv6 allows a node to assign multiple addresses
+	 * on a single interface, we almost always look and check the
+	 * presence of ifra_addr, and reject invalid ones here.
+	 * It also decreases duplicated code among SIOC*_IN6 operations.
+	 */
+	switch (cmd) {
+	case SIOCAIFADDR_IN6:
+	case SIOCSIFPHYADDR_IN6:
+		sa6 = &ifra->ifra_addr;
+		break;
+	case SIOCSIFADDR_IN6:
+	case SIOCGIFADDR_IN6:
+	case SIOCSIFDSTADDR_IN6:
+	case SIOCSIFNETMASK_IN6:
+	case SIOCGIFDSTADDR_IN6:
+	case SIOCGIFNETMASK_IN6:
+	case SIOCDIFADDR_IN6:
+	case SIOCGIFPSRCADDR_IN6:
+	case SIOCGIFPDSTADDR_IN6:
+	case SIOCGIFAFLAG_IN6:
+	case SIOCSNDFLUSH_IN6:
+	case SIOCSPFXFLUSH_IN6:
+	case SIOCSRTRFLUSH_IN6:
+	case SIOCGIFALIFETIME_IN6:
+	case SIOCSIFALIFETIME_IN6:
+	case SIOCGIFSTAT_IN6:
+	case SIOCGIFSTAT_ICMP6:
+		sa6 = &ifr->ifr_addr;
+		break;
+	default:
+		sa6 = NULL;
+		break;
+	}
+	if (sa6 && sa6->sin6_family == AF_INET6) {
+		if (sa6->sin6_scope_id != 0)
+			error = sa6_embedscope(sa6, 0);
+		else
+			error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
+		if (error != 0)
+			return (error);
+		if (td != NULL && (error = prison_check_ip6(td->td_ucred,
+		    &sa6->sin6_addr)) != 0)
+			return (error);
+		ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
+	} else
+		ia = NULL;
+
+	switch (cmd) {
+	case SIOCSIFADDR_IN6:
+	case SIOCSIFDSTADDR_IN6:
+	case SIOCSIFNETMASK_IN6:
+		/*
+		 * Since IPv6 allows a node to assign multiple addresses
+		 * on a single interface, SIOCSIFxxx ioctls are deprecated.
+		 */
+		/* we decided to obsolete this command (20000704) */
+		error = EINVAL;
+		goto out;
+
+	case SIOCDIFADDR_IN6:
+		/*
+		 * for IPv4, we look for existing in_ifaddr here to allow
+		 * "ifconfig if0 delete" to remove the first IPv4 address on
+		 * the interface.  For IPv6, as the spec allows multiple
+		 * interface address from the day one, we consider "remove the
+		 * first one" semantics to be not preferable.
+		 */
+		if (ia == NULL) {
+			error = EADDRNOTAVAIL;
+			goto out;
+		}
+		/* FALLTHROUGH */
+	case SIOCAIFADDR_IN6:
+		/*
+		 * We always require users to specify a valid IPv6 address for
+		 * the corresponding operation.
+		 */
+		if (ifra->ifra_addr.sin6_family != AF_INET6 ||
+		    ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
+			error = EAFNOSUPPORT;
+			goto out;
+		}
+
+		if (td != NULL) {
+			error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 
+			    PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
+			if (error)
+				goto out;
+		}
+		break;
+
+	case SIOCGIFADDR_IN6:
+		/* This interface is basically deprecated. use SIOCGIFCONF. */
+		/* FALLTHROUGH */
+	case SIOCGIFAFLAG_IN6:
+	case SIOCGIFNETMASK_IN6:
+	case SIOCGIFDSTADDR_IN6:
+	case SIOCGIFALIFETIME_IN6:
+		/* must think again about its semantics */
+		if (ia == NULL) {
+			error = EADDRNOTAVAIL;
+			goto out;
+		}
+		break;
+
+	case SIOCSIFALIFETIME_IN6:
+	    {
+		struct in6_addrlifetime *lt;
+
+		if (td != NULL) {
+			error = priv_check(td, PRIV_NETINET_ALIFETIME6);
+			if (error)
+				goto out;
+		}
+		if (ia == NULL) {
+			error = EADDRNOTAVAIL;
+			goto out;
+		}
+		/* sanity for overflow - beware unsigned */
+		lt = &ifr->ifr_ifru.ifru_lifetime;
+		if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
+		    lt->ia6t_vltime + time_second < time_second) {
+			error = EINVAL;
+			goto out;
+		}
+		if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
+		    lt->ia6t_pltime + time_second < time_second) {
+			error = EINVAL;
+			goto out;
+		}
+		break;
+	    }
+	}
+
+	switch (cmd) {
+	case SIOCGIFADDR_IN6:
+		ifr->ifr_addr = ia->ia_addr;
+		if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
+			goto out;
+		break;
+
+	case SIOCGIFDSTADDR_IN6:
+		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
+			error = EINVAL;
+			goto out;
+		}
+		/*
+		 * XXX: should we check if ifa_dstaddr is NULL and return
+		 * an error?
+		 */
+		ifr->ifr_dstaddr = ia->ia_dstaddr;
+		if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
+			goto out;
+		break;
+
+	case SIOCGIFNETMASK_IN6:
+		ifr->ifr_addr = ia->ia_prefixmask;
+		break;
+
+	case SIOCGIFAFLAG_IN6:
+		ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
+		break;
+
+	case SIOCGIFSTAT_IN6:
+		if (ifp == NULL) {
+			error = EINVAL;
+			goto out;
+		}
+		bzero(&ifr->ifr_ifru.ifru_stat,
+		    sizeof(ifr->ifr_ifru.ifru_stat));
+		ifr->ifr_ifru.ifru_stat =
+		    *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
+		break;
+
+	case SIOCGIFSTAT_ICMP6:
+		if (ifp == NULL) {
+			error = EINVAL;
+			goto out;
+		}
+		bzero(&ifr->ifr_ifru.ifru_icmp6stat,
+		    sizeof(ifr->ifr_ifru.ifru_icmp6stat));
+		ifr->ifr_ifru.ifru_icmp6stat =
+		    *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
+		break;
+
+	case SIOCGIFALIFETIME_IN6:
+		ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
+		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
+			time_t maxexpire;
+			struct in6_addrlifetime *retlt =
+			    &ifr->ifr_ifru.ifru_lifetime;
+
+			/*
+			 * XXX: adjust expiration time assuming time_t is
+			 * signed.
+			 */
+			maxexpire = (-1) &
+			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
+			if (ia->ia6_lifetime.ia6t_vltime <
+			    maxexpire - ia->ia6_updatetime) {
+				retlt->ia6t_expire = ia->ia6_updatetime +
+				    ia->ia6_lifetime.ia6t_vltime;
+			} else
+				retlt->ia6t_expire = maxexpire;
+		}
+		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
+			time_t maxexpire;
+			struct in6_addrlifetime *retlt =
+			    &ifr->ifr_ifru.ifru_lifetime;
+
+			/*
+			 * XXX: adjust expiration time assuming time_t is
+			 * signed.
+			 */
+			maxexpire = (-1) &
+			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
+			if (ia->ia6_lifetime.ia6t_pltime <
+			    maxexpire - ia->ia6_updatetime) {
+				retlt->ia6t_preferred = ia->ia6_updatetime +
+				    ia->ia6_lifetime.ia6t_pltime;
+			} else
+				retlt->ia6t_preferred = maxexpire;
+		}
+		break;
+
+	case SIOCSIFALIFETIME_IN6:
+		ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
+		/* for sanity */
+		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
+			ia->ia6_lifetime.ia6t_expire =
+				time_second + ia->ia6_lifetime.ia6t_vltime;
+		} else
+			ia->ia6_lifetime.ia6t_expire = 0;
+		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
+			ia->ia6_lifetime.ia6t_preferred =
+				time_second + ia->ia6_lifetime.ia6t_pltime;
+		} else
+			ia->ia6_lifetime.ia6t_preferred = 0;
+		break;
+
+	case SIOCAIFADDR_IN6:
+	{
+		int i;
+		struct nd_prefixctl pr0;
+		struct nd_prefix *pr;
+
+		/*
+		 * first, make or update the interface address structure,
+		 * and link it to the list.
+		 */
+		if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
+			goto out;
+		if (ia != NULL)
+			ifa_free(&ia->ia_ifa);
+		if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
+		    == NULL) {
+			/*
+			 * this can happen when the user specify the 0 valid
+			 * lifetime.
+			 */
+			break;
+		}
+
+		/*
+		 * then, make the prefix on-link on the interface.
+		 * XXX: we'd rather create the prefix before the address, but
+		 * we need at least one address to install the corresponding
+		 * interface route, so we configure the address first.
+		 */
+
+		/*
+		 * convert mask to prefix length (prefixmask has already
+		 * been validated in in6_update_ifa().
+		 */
+		bzero(&pr0, sizeof(pr0));
+		pr0.ndpr_ifp = ifp;
+		pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
+		    NULL);
+		if (pr0.ndpr_plen == 128) {
+			break;	/* we don't need to install a host route. */
+		}
+		pr0.ndpr_prefix = ifra->ifra_addr;
+		/* apply the mask for safety. */
+		for (i = 0; i < 4; i++) {
+			pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
+			    ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
+		}
+		/*
+		 * XXX: since we don't have an API to set prefix (not address)
+		 * lifetimes, we just use the same lifetimes as addresses.
+		 * The (temporarily) installed lifetimes can be overridden by
+		 * later advertised RAs (when accept_rtadv is non 0), which is
+		 * an intended behavior.
+		 */
+		pr0.ndpr_raf_onlink = 1; /* should be configurable? */
+		pr0.ndpr_raf_auto =
+		    ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
+		pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
+		pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
+
+		/* add the prefix if not yet. */
+		if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
+			/*
+			 * nd6_prelist_add will install the corresponding
+			 * interface route.
+			 */
+			if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
+				goto out;
+			if (pr == NULL) {
+				log(LOG_ERR, "nd6_prelist_add succeeded but "
+				    "no prefix\n");
+				error = EINVAL;
+				goto out;
+			}
+		}
+
+		/* relate the address to the prefix */
+		if (ia->ia6_ndpr == NULL) {
+			ia->ia6_ndpr = pr;
+			pr->ndpr_refcnt++;
+
+			/*
+			 * If this is the first autoconf address from the
+			 * prefix, create a temporary address as well
+			 * (when required).
+			 */
+			if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
+			    V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
+				int e;
+				if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
+					log(LOG_NOTICE, "in6_control: failed "
+					    "to create a temporary address, "
+					    "errno=%d\n", e);
+				}
+			}
+		}
+
+		/*
+		 * this might affect the status of autoconfigured addresses,
+		 * that is, this address might make other addresses detached.
+		 */
+		pfxlist_onlink_check();
+		if (error == 0 && ia)
+			EVENTHANDLER_INVOKE(ifaddr_event, ifp);
+		break;
+	}
+
+	case SIOCDIFADDR_IN6:
+	{
+		struct nd_prefix *pr;
+
+		/*
+		 * If the address being deleted is the only one that owns
+		 * the corresponding prefix, expire the prefix as well.
+		 * XXX: theoretically, we don't have to worry about such
+		 * relationship, since we separate the address management
+		 * and the prefix management.  We do this, however, to provide
+		 * as much backward compatibility as possible in terms of
+		 * the ioctl operation.
+		 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
+		 */
+		pr = ia->ia6_ndpr;
+		in6_purgeaddr(&ia->ia_ifa);
+		if (pr && pr->ndpr_refcnt == 0)
+			prelist_remove(pr);
+		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
+		break;
+	}
+
+	default:
+		if (ifp == NULL || ifp->if_ioctl == 0) {
+			error = EOPNOTSUPP;
+			goto out;
+		}
+		error = (*ifp->if_ioctl)(ifp, cmd, data);
+		goto out;
+	}
+
+	error = 0;
+out:
+	if (ia != NULL)
+		ifa_free(&ia->ia_ifa);
+	return (error);
+}
+
+/*
+ * Update parameters of an IPv6 interface address.
+ * If necessary, a new entry is created and linked into address chains.
+ * This function is separated from in6_control().
+ * XXX: should this be performed under splnet()?
+ */
+int
+in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
+    struct in6_ifaddr *ia, int flags)
+{
+	int error = 0, hostIsNew = 0, plen = -1;
+	struct sockaddr_in6 dst6;
+	struct in6_addrlifetime *lt;
+	struct in6_multi_mship *imm;
+	struct in6_multi *in6m_sol;
+	struct rtentry *rt;
+	int delay;
+	char ip6buf[INET6_ADDRSTRLEN];
+
+	/* Validate parameters */
+	if (ifp == NULL || ifra == NULL) /* this maybe redundant */
+		return (EINVAL);
+
+	/*
+	 * The destination address for a p2p link must have a family
+	 * of AF_UNSPEC or AF_INET6.
+	 */
+	if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
+	    ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
+	    ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
+		return (EAFNOSUPPORT);
+	/*
+	 * validate ifra_prefixmask.  don't check sin6_family, netmask
+	 * does not carry fields other than sin6_len.
+	 */
+	if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
+		return (EINVAL);
+	/*
+	 * Because the IPv6 address architecture is classless, we require
+	 * users to specify a (non 0) prefix length (mask) for a new address.
+	 * We also require the prefix (when specified) mask is valid, and thus
+	 * reject a non-consecutive mask.
+	 */
+	if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
+		return (EINVAL);
+	if (ifra->ifra_prefixmask.sin6_len != 0) {
+		plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
+		    (u_char *)&ifra->ifra_prefixmask +
+		    ifra->ifra_prefixmask.sin6_len);
+		if (plen <= 0)
+			return (EINVAL);
+	} else {
+		/*
+		 * In this case, ia must not be NULL.  We just use its prefix
+		 * length.
+		 */
+		plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
+	}
+	/*
+	 * If the destination address on a p2p interface is specified,
+	 * and the address is a scoped one, validate/set the scope
+	 * zone identifier.
+	 */
+	dst6 = ifra->ifra_dstaddr;
+	if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
+	    (dst6.sin6_family == AF_INET6)) {
+		struct in6_addr in6_tmp;
+		u_int32_t zoneid;
+
+		in6_tmp = dst6.sin6_addr;
+		if (in6_setscope(&in6_tmp, ifp, &zoneid))
+			return (EINVAL); /* XXX: should be impossible */
+
+		if (dst6.sin6_scope_id != 0) {
+			if (dst6.sin6_scope_id != zoneid)
+				return (EINVAL);
+		} else		/* user omit to specify the ID. */
+			dst6.sin6_scope_id = zoneid;
+
+		/* convert into the internal form */
+		if (sa6_embedscope(&dst6, 0))
+			return (EINVAL); /* XXX: should be impossible */
+	}
+	/*
+	 * The destination address can be specified only for a p2p or a
+	 * loopback interface.  If specified, the corresponding prefix length
+	 * must be 128.
+	 */
+	if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
+		if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
+			/* XXX: noisy message */
+			nd6log((LOG_INFO, "in6_update_ifa: a destination can "
+			    "be specified for a p2p or a loopback IF only\n"));
+			return (EINVAL);
+		}
+		if (plen != 128) {
+			nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
+			    "be 128 when dstaddr is specified\n"));
+			return (EINVAL);
+		}
+	}
+	/* lifetime consistency check */
+	lt = &ifra->ifra_lifetime;
+	if (lt->ia6t_pltime > lt->ia6t_vltime)
+		return (EINVAL);
+	if (lt->ia6t_vltime == 0) {
+		/*
+		 * the following log might be noisy, but this is a typical
+		 * configuration mistake or a tool's bug.
+		 */
+		nd6log((LOG_INFO,
+		    "in6_update_ifa: valid lifetime is 0 for %s\n",
+		    ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
+
+		if (ia == NULL)
+			return (0); /* there's nothing to do */
+	}
+
+	/*
+	 * If this is a new address, allocate a new ifaddr and link it
+	 * into chains.
+	 */
+	if (ia == NULL) {
+		hostIsNew = 1;
+		/*
+		 * When in6_update_ifa() is called in a process of a received
+		 * RA, it is called under an interrupt context.  So, we should
+		 * call malloc with M_NOWAIT.
+		 */
+		ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
+		    M_NOWAIT);
+		if (ia == NULL)
+			return (ENOBUFS);
+		bzero((caddr_t)ia, sizeof(*ia));
+		ifa_init(&ia->ia_ifa);
+		LIST_INIT(&ia->ia6_memberships);
+		/* Initialize the address and masks, and put time stamp */
+		ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
+		ia->ia_addr.sin6_family = AF_INET6;
+		ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
+		ia->ia6_createtime = time_second;
+		if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
+			/*
+			 * XXX: some functions expect that ifa_dstaddr is not
+			 * NULL for p2p interfaces.
+			 */
+			ia->ia_ifa.ifa_dstaddr =
+			    (struct sockaddr *)&ia->ia_dstaddr;
+		} else {
+			ia->ia_ifa.ifa_dstaddr = NULL;
+		}
+		ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
+		ia->ia_ifp = ifp;
+		ifa_ref(&ia->ia_ifa);			/* if_addrhead */
+		IF_ADDR_LOCK(ifp);
+		TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
+		IF_ADDR_UNLOCK(ifp);
+
+		ifa_ref(&ia->ia_ifa);			/* in6_ifaddrhead */
+		IN6_IFADDR_WLOCK();
+		TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
+		IN6_IFADDR_WUNLOCK();
+	}
+
+	/* update timestamp */
+	ia->ia6_updatetime = time_second;
+
+	/* set prefix mask */
+	if (ifra->ifra_prefixmask.sin6_len) {
+		/*
+		 * We prohibit changing the prefix length of an existing
+		 * address, because
+		 * + such an operation should be rare in IPv6, and
+		 * + the operation would confuse prefix management.
+		 */
+		if (ia->ia_prefixmask.sin6_len &&
+		    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
+			nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
+			    " existing (%s) address should not be changed\n",
+			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
+			error = EINVAL;
+			goto unlink;
+		}
+		ia->ia_prefixmask = ifra->ifra_prefixmask;
+	}
+
+	/*
+	 * If a new destination address is specified, scrub the old one and
+	 * install the new destination.  Note that the interface must be
+	 * p2p or loopback (see the check above.)
+	 */
+	if (dst6.sin6_family == AF_INET6 &&
+	    !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
+		int e;
+
+		if ((ia->ia_flags & IFA_ROUTE) != 0 &&
+		    (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
+			nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
+			    "a route to the old destination: %s\n",
+			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
+			/* proceed anyway... */
+		} else
+			ia->ia_flags &= ~IFA_ROUTE;
+		ia->ia_dstaddr = dst6;
+	}
+
+	/*
+	 * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
+	 * to see if the address is deprecated or invalidated, but initialize
+	 * these members for applications.
+	 */
+	ia->ia6_lifetime = ifra->ifra_lifetime;
+	if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
+		ia->ia6_lifetime.ia6t_expire =
+		    time_second + ia->ia6_lifetime.ia6t_vltime;
+	} else
+		ia->ia6_lifetime.ia6t_expire = 0;
+	if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
+		ia->ia6_lifetime.ia6t_preferred =
+		    time_second + ia->ia6_lifetime.ia6t_pltime;
+	} else
+		ia->ia6_lifetime.ia6t_preferred = 0;
+
+	/* reset the interface and routing table appropriately. */
+	if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
+		goto unlink;
+
+	/*
+	 * configure address flags.
+	 */
+	ia->ia6_flags = ifra->ifra_flags;
+	/*
+	 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
+	 * userland, make it deprecated.
+	 */
+	if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
+		ia->ia6_lifetime.ia6t_pltime = 0;
+		ia->ia6_lifetime.ia6t_preferred = time_second;
+	}
+	/*
+	 * Make the address tentative before joining multicast addresses,
+	 * so that corresponding MLD responses would not have a tentative
+	 * source address.
+	 */
+	ia->ia6_flags &= ~IN6_IFF_DUPLICATED;	/* safety */
+	if (hostIsNew && in6if_do_dad(ifp))
+		ia->ia6_flags |= IN6_IFF_TENTATIVE;
+
+	/*
+	 * We are done if we have simply modified an existing address.
+	 */
+	if (!hostIsNew)
+		return (error);
+
+	/*
+	 * Beyond this point, we should call in6_purgeaddr upon an error,
+	 * not just go to unlink.
+	 */
+
+	/* Join necessary multicast groups */
+	in6m_sol = NULL;
+	if ((ifp->if_flags & IFF_MULTICAST) != 0) {
+		struct sockaddr_in6 mltaddr, mltmask;
+		struct in6_addr llsol;
+
+		/* join solicited multicast addr for new host id */
+		bzero(&llsol, sizeof(struct in6_addr));
+		llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
+		llsol.s6_addr32[1] = 0;
+		llsol.s6_addr32[2] = htonl(1);
+		llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
+		llsol.s6_addr8[12] = 0xff;
+		if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
+			/* XXX: should not happen */
+			log(LOG_ERR, "in6_update_ifa: "
+			    "in6_setscope failed\n");
+			goto cleanup;
+		}
+		delay = 0;
+		if ((flags & IN6_IFAUPDATE_DADDELAY)) {
+			/*
+			 * We need a random delay for DAD on the address
+			 * being configured.  It also means delaying
+			 * transmission of the corresponding MLD report to
+			 * avoid report collision.
+			 * [draft-ietf-ipv6-rfc2462bis-02.txt]
+			 */
+			delay = arc4random() %
+			    (MAX_RTR_SOLICITATION_DELAY * hz);
+		}
+		imm = in6_joingroup(ifp, &llsol, &error, delay);
+		if (imm == NULL) {
+			nd6log((LOG_WARNING,
+			    "in6_update_ifa: addmulti failed for "
+			    "%s on %s (errno=%d)\n",
+			    ip6_sprintf(ip6buf, &llsol), if_name(ifp),
+			    error));
+			goto cleanup;
+		}
+		LIST_INSERT_HEAD(&ia->ia6_memberships,
+		    imm, i6mm_chain);
+		in6m_sol = imm->i6mm_maddr;
+
+		bzero(&mltmask, sizeof(mltmask));
+		mltmask.sin6_len = sizeof(struct sockaddr_in6);
+		mltmask.sin6_family = AF_INET6;
+		mltmask.sin6_addr = in6mask32;
+#define	MLTMASK_LEN  4	/* mltmask's masklen (=32bit=4octet) */
+
+		/*
+		 * join link-local all-nodes address
+		 */
+		bzero(&mltaddr, sizeof(mltaddr));
+		mltaddr.sin6_len = sizeof(struct sockaddr_in6);
+		mltaddr.sin6_family = AF_INET6;
+		mltaddr.sin6_addr = in6addr_linklocal_allnodes;
+		if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
+		    0)
+			goto cleanup; /* XXX: should not fail */
+
+		/*
+		 * XXX: do we really need this automatic routes?
+		 * We should probably reconsider this stuff.  Most applications
+		 * actually do not need the routes, since they usually specify
+		 * the outgoing interface.
+		 */
+		rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
+		if (rt) {
+			/* XXX: only works in !SCOPEDROUTING case. */
+			if (memcmp(&mltaddr.sin6_addr,
+			    &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
+			    MLTMASK_LEN)) {
+				RTFREE_LOCKED(rt);
+				rt = NULL;
+			}
+		}
+		if (!rt) {
+			error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
+			    (struct sockaddr *)&ia->ia_addr,
+			    (struct sockaddr *)&mltmask, RTF_UP,
+			    (struct rtentry **)0);
+			if (error)
+				goto cleanup;
+		} else {
+			RTFREE_LOCKED(rt);
+		}
+
+		imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
+		if (!imm) {
+			nd6log((LOG_WARNING,
+			    "in6_update_ifa: addmulti failed for "
+			    "%s on %s (errno=%d)\n",
+			    ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
+			    if_name(ifp), error));
+			goto cleanup;
+		}
+		LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
+
+		/*
+		 * join node information group address
+		 */
+		delay = 0;
+		if ((flags & IN6_IFAUPDATE_DADDELAY)) {
+			/*
+			 * The spec doesn't say anything about delay for this
+			 * group, but the same logic should apply.
+			 */
+			delay = arc4random() %
+			    (MAX_RTR_SOLICITATION_DELAY * hz);
+		}
+		if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
+			imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error,
+			    delay); /* XXX jinmei */
+			if (!imm) {
+				nd6log((LOG_WARNING, "in6_update_ifa: "
+				    "addmulti failed for %s on %s "
+				    "(errno=%d)\n",
+				    ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
+				    if_name(ifp), error));
+				/* XXX not very fatal, go on... */
+			} else {
+				LIST_INSERT_HEAD(&ia->ia6_memberships,
+				    imm, i6mm_chain);
+			}
+		}
+
+		/*
+		 * join interface-local all-nodes address.
+		 * (ff01::1%ifN, and ff01::%ifN/32)
+		 */
+		mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
+		if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL))
+		    != 0)
+			goto cleanup; /* XXX: should not fail */
+		/* XXX: again, do we really need the route? */
+		rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
+		if (rt) {
+			if (memcmp(&mltaddr.sin6_addr,
+			    &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
+			    MLTMASK_LEN)) {
+				RTFREE_LOCKED(rt);
+				rt = NULL;
+			}
+		}
+		if (!rt) {
+			error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
+			    (struct sockaddr *)&ia->ia_addr,
+			    (struct sockaddr *)&mltmask, RTF_UP,
+			    (struct rtentry **)0);
+			if (error)
+				goto cleanup;
+		} else
+			RTFREE_LOCKED(rt);
+
+		imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
+		if (!imm) {
+			nd6log((LOG_WARNING, "in6_update_ifa: "
+			    "addmulti failed for %s on %s "
+			    "(errno=%d)\n",
+			    ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
+			    if_name(ifp), error));
+			goto cleanup;
+		}
+		LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
+#undef	MLTMASK_LEN
+	}
+
+	/*
+	 * Perform DAD, if needed.
+	 * XXX It may be of use, if we can administratively
+	 * disable DAD.
+	 */
+	if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
+	    (ia->ia6_flags & IN6_IFF_TENTATIVE))
+	{
+		int mindelay, maxdelay;
+
+		delay = 0;
+		if ((flags & IN6_IFAUPDATE_DADDELAY)) {
+			/*
+			 * We need to impose a delay before sending an NS
+			 * for DAD.  Check if we also needed a delay for the
+			 * corresponding MLD message.  If we did, the delay
+			 * should be larger than the MLD delay (this could be
+			 * relaxed a bit, but this simple logic is at least
+			 * safe).
+			 * XXX: Break data hiding guidelines and look at
+			 * state for the solicited multicast group.
+			 */
+			mindelay = 0;
+			if (in6m_sol != NULL &&
+			    in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
+				mindelay = in6m_sol->in6m_timer;
+			}
+			maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
+			if (maxdelay - mindelay == 0)
+				delay = 0;
+			else {
+				delay =
+				    (arc4random() % (maxdelay - mindelay)) +
+				    mindelay;
+			}
+		}
+		nd6_dad_start((struct ifaddr *)ia, delay);
+	}
+
+	KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew"));
+	ifa_free(&ia->ia_ifa);
+	return (error);
+
+  unlink:
+	/*
+	 * XXX: if a change of an existing address failed, keep the entry
+	 * anyway.
+	 */
+	if (hostIsNew) {
+		in6_unlink_ifa(ia, ifp);
+		ifa_free(&ia->ia_ifa);
+	}
+	return (error);
+
+  cleanup:
+	KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew"));
+	ifa_free(&ia->ia_ifa);
+	in6_purgeaddr(&ia->ia_ifa);
+	return error;
+}
+
+void
+in6_purgeaddr(struct ifaddr *ifa)
+{
+	struct ifnet *ifp = ifa->ifa_ifp;
+	struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
+	struct in6_multi_mship *imm;
+	struct sockaddr_in6 mltaddr, mltmask;
+	struct rtentry rt0;
+	struct sockaddr_dl gateway;
+	struct sockaddr_in6 mask, addr;
+	int plen, error;
+	struct rtentry *rt;
+	struct ifaddr *ifa0, *nifa;
+
+	/*
+	 * find another IPv6 address as the gateway for the
+	 * link-local and node-local all-nodes multicast
+	 * address routes
+	 */
+	IF_ADDR_LOCK(ifp);
+	TAILQ_FOREACH_SAFE(ifa0, &ifp->if_addrhead, ifa_link, nifa) {
+		if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
+		    memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
+			   &ia->ia_addr.sin6_addr, 
+			   sizeof(struct in6_addr)) == 0)
+			continue;
+		else
+			break;
+	}
+	if (ifa0 != NULL)
+		ifa_ref(ifa0);
+	IF_ADDR_UNLOCK(ifp);
+
+	/*
+	 * Remove the loopback route to the interface address.
+	 * The check for the current setting of "nd6_useloopback" 
+	 * is not needed.
+	 */
+	if (ia->ia_flags & IFA_RTSELF) {
+		error = ifa_del_loopback_route((struct ifaddr *)ia,
+				       (struct sockaddr *)&ia->ia_addr);
+		if (error == 0)
+			ia->ia_flags &= ~IFA_RTSELF;
+	}
+
+	/* stop DAD processing */
+	nd6_dad_stop(ifa);
+
+	IF_AFDATA_LOCK(ifp);
+	lla_lookup(LLTABLE6(ifp), (LLE_DELETE | LLE_IFADDR),
+	    (struct sockaddr *)&ia->ia_addr);
+	IF_AFDATA_UNLOCK(ifp);
+
+	/*
+	 * initialize for rtmsg generation
+	 */
+	bzero(&gateway, sizeof(gateway));
+	gateway.sdl_len = sizeof(gateway);
+	gateway.sdl_family = AF_LINK;
+	gateway.sdl_nlen = 0;
+	gateway.sdl_alen = ifp->if_addrlen;
+	/* */
+	bzero(&rt0, sizeof(rt0));
+	rt0.rt_gateway = (struct sockaddr *)&gateway;
+	memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
+	memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
+	rt_mask(&rt0) = (struct sockaddr *)&mask;
+	rt_key(&rt0) = (struct sockaddr *)&addr;
+	rt0.rt_flags = RTF_HOST | RTF_STATIC;
+	rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0);
+
+	/*
+	 * leave from multicast groups we have joined for the interface
+	 */
+	while ((imm = ia->ia6_memberships.lh_first) != NULL) {
+		LIST_REMOVE(imm, i6mm_chain);
+		in6_leavegroup(imm);
+	}
+
+	/*
+	 * remove the link-local all-nodes address
+	 */
+	bzero(&mltmask, sizeof(mltmask));
+	mltmask.sin6_len = sizeof(struct sockaddr_in6);
+	mltmask.sin6_family = AF_INET6;
+	mltmask.sin6_addr = in6mask32;
+
+	bzero(&mltaddr, sizeof(mltaddr));
+	mltaddr.sin6_len = sizeof(struct sockaddr_in6);
+	mltaddr.sin6_family = AF_INET6;
+	mltaddr.sin6_addr = in6addr_linklocal_allnodes;
+
+	if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
+	    0)
+		goto cleanup; 
+
+	rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
+	if (rt != NULL && rt->rt_gateway != NULL &&
+	    (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 
+		    &ia->ia_addr.sin6_addr,
+		    sizeof(ia->ia_addr.sin6_addr)) == 0)) {
+		/* 
+		 * if no more IPv6 address exists on this interface
+		 * then remove the multicast address route
+		 */
+		if (ifa0 == NULL) {
+			memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 
+			       sizeof(mltaddr.sin6_addr));
+			RTFREE_LOCKED(rt);
+			error = rtrequest(RTM_DELETE, (struct sockaddr *)&mltaddr,
+					  (struct sockaddr *)&ia->ia_addr,
+					  (struct sockaddr *)&mltmask, RTF_UP,
+					  (struct rtentry **)0);
+			if (error)
+				log(LOG_INFO, "in6_purgeaddr: link-local all-nodes"
+				    "multicast address deletion error\n");
+		} else {
+			/*
+			 * replace the gateway of the route
+			 */
+			struct sockaddr_in6 sa;
+
+			bzero(&sa, sizeof(sa));
+			sa.sin6_len = sizeof(struct sockaddr_in6);
+			sa.sin6_family = AF_INET6;
+			memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 
+			       sizeof(sa.sin6_addr));
+			in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL);
+			memcpy(rt->rt_gateway, &sa, sizeof(sa));
+			RTFREE_LOCKED(rt);
+		}
+	} else {
+		if (rt != NULL)
+			RTFREE_LOCKED(rt);
+	}
+
+	/*
+	 * remove the node-local all-nodes address
+	 */
+	mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
+	if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
+	    0)
+		goto cleanup;
+
+	rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
+	if (rt != NULL && rt->rt_gateway != NULL &&
+	    (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 
+		    &ia->ia_addr.sin6_addr,
+		    sizeof(ia->ia_addr.sin6_addr)) == 0)) {
+		/* 
+		 * if no more IPv6 address exists on this interface
+		 * then remove the multicast address route
+		 */
+		if (ifa0 == NULL) {
+			memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 
+			       sizeof(mltaddr.sin6_addr));
+
+			RTFREE_LOCKED(rt);
+			error = rtrequest(RTM_DELETE, (struct sockaddr *)&mltaddr,
+					  (struct sockaddr *)&ia->ia_addr,
+					  (struct sockaddr *)&mltmask, RTF_UP,
+					  (struct rtentry **)0);
+
+			if (error)
+				log(LOG_INFO, "in6_purgeaddr: node-local all-nodes"
+				    "multicast address deletion error\n");
+		} else {
+			/*
+			 * replace the gateway of the route
+			 */
+			struct sockaddr_in6 sa;
+
+			bzero(&sa, sizeof(sa));
+			sa.sin6_len = sizeof(struct sockaddr_in6);
+			sa.sin6_family = AF_INET6;
+			memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 
+			       sizeof(sa.sin6_addr));
+			in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL);
+			memcpy(rt->rt_gateway, &sa, sizeof(sa));
+			RTFREE_LOCKED(rt);
+		}
+	} else {
+		if (rt != NULL)
+			RTFREE_LOCKED(rt);
+	}
+
+cleanup:
+
+	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
+	if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
+		int error;
+		struct sockaddr *dstaddr;
+
+		/* 
+		 * use the interface address if configuring an
+		 * interface address with a /128 prefix len
+		 */
+		if (ia->ia_dstaddr.sin6_family == AF_INET6)
+			dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
+		else
+			dstaddr = (struct sockaddr *)&ia->ia_addr;
+
+		error = rtrequest(RTM_DELETE,
+		    (struct sockaddr *)dstaddr,
+		    (struct sockaddr *)&ia->ia_addr,
+		    (struct sockaddr *)&ia->ia_prefixmask,
+		    ia->ia_flags | RTF_HOST, NULL);
+		if (error != 0)
+			return;
+		ia->ia_flags &= ~IFA_ROUTE;
+	}
+	if (ifa0 != NULL)
+		ifa_free(ifa0);
+
+	in6_unlink_ifa(ia, ifp);
+}
+
+static void
+in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
+{
+	int	s = splnet();
+
+	IF_ADDR_LOCK(ifp);
+	TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
+	IF_ADDR_UNLOCK(ifp);
+	ifa_free(&ia->ia_ifa);			/* if_addrhead */
+
+	/*
+	 * Defer the release of what might be the last reference to the
+	 * in6_ifaddr so that it can't be freed before the remainder of the
+	 * cleanup.
+	 */
+	IN6_IFADDR_WLOCK();
+	TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
+	IN6_IFADDR_WUNLOCK();
+
+	/*
+	 * Release the reference to the base prefix.  There should be a
+	 * positive reference.
+	 */
+	if (ia->ia6_ndpr == NULL) {
+		nd6log((LOG_NOTICE,
+		    "in6_unlink_ifa: autoconf'ed address "
+		    "%p has no prefix\n", ia));
+	} else {
+		ia->ia6_ndpr->ndpr_refcnt--;
+		ia->ia6_ndpr = NULL;
+	}
+
+	/*
+	 * Also, if the address being removed is autoconf'ed, call
+	 * pfxlist_onlink_check() since the release might affect the status of
+	 * other (detached) addresses.
+	 */
+	if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
+		pfxlist_onlink_check();
+	}
+	ifa_free(&ia->ia_ifa);			/* in6_ifaddrhead */
+	splx(s);
+}
+
+void
+in6_purgeif(struct ifnet *ifp)
+{
+	struct ifaddr *ifa, *nifa;
+
+	TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
+		if (ifa->ifa_addr->sa_family != AF_INET6)
+			continue;
+		in6_purgeaddr(ifa);
+	}
+
+	in6_ifdetach(ifp);
+}
+
+/*
+ * SIOC[GAD]LIFADDR.
+ *	SIOCGLIFADDR: get first address. (?)
+ *	SIOCGLIFADDR with IFLR_PREFIX:
+ *		get first address that matches the specified prefix.
+ *	SIOCALIFADDR: add the specified address.
+ *	SIOCALIFADDR with IFLR_PREFIX:
+ *		add the specified prefix, filling hostid part from
+ *		the first link-local address.  prefixlen must be <= 64.
+ *	SIOCDLIFADDR: delete the specified address.
+ *	SIOCDLIFADDR with IFLR_PREFIX:
+ *		delete the first address that matches the specified prefix.
+ * return values:
+ *	EINVAL on invalid parameters
+ *	EADDRNOTAVAIL on prefix match failed/specified address not found
+ *	other values may be returned from in6_ioctl()
+ *
+ * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
+ * this is to accomodate address naming scheme other than RFC2374,
+ * in the future.
+ * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
+ * address encoding scheme. (see figure on page 8)
+ */
+static int
+in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
+    struct ifnet *ifp, struct thread *td)
+{
+	struct if_laddrreq *iflr = (struct if_laddrreq *)data;
+	struct ifaddr *ifa;
+	struct sockaddr *sa;
+
+	/* sanity checks */
+	if (!data || !ifp) {
+		panic("invalid argument to in6_lifaddr_ioctl");
+		/* NOTREACHED */
+	}
+
+	switch (cmd) {
+	case SIOCGLIFADDR:
+		/* address must be specified on GET with IFLR_PREFIX */
+		if ((iflr->flags & IFLR_PREFIX) == 0)
+			break;
+		/* FALLTHROUGH */
+	case SIOCALIFADDR:
+	case SIOCDLIFADDR:
+		/* address must be specified on ADD and DELETE */
+		sa = (struct sockaddr *)&iflr->addr;
+		if (sa->sa_family != AF_INET6)
+			return EINVAL;
+		if (sa->sa_len != sizeof(struct sockaddr_in6))
+			return EINVAL;
+		/* XXX need improvement */
+		sa = (struct sockaddr *)&iflr->dstaddr;
+		if (sa->sa_family && sa->sa_family != AF_INET6)
+			return EINVAL;
+		if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
+			return EINVAL;
+		break;
+	default: /* shouldn't happen */
+#if 0
+		panic("invalid cmd to in6_lifaddr_ioctl");
+		/* NOTREACHED */
+#else
+		return EOPNOTSUPP;
+#endif
+	}
+	if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
+		return EINVAL;
+
+	switch (cmd) {
+	case SIOCALIFADDR:
+	    {
+		struct in6_aliasreq ifra;
+		struct in6_addr *hostid = NULL;
+		int prefixlen;
+
+		ifa = NULL;
+		if ((iflr->flags & IFLR_PREFIX) != 0) {
+			struct sockaddr_in6 *sin6;
+
+			/*
+			 * hostid is to fill in the hostid part of the
+			 * address.  hostid points to the first link-local
+			 * address attached to the interface.
+			 */
+			ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
+			if (!ifa)
+				return EADDRNOTAVAIL;
+			hostid = IFA_IN6(ifa);
+
+			/* prefixlen must be <= 64. */
+			if (64 < iflr->prefixlen)
+				return EINVAL;
+			prefixlen = iflr->prefixlen;
+
+			/* hostid part must be zero. */
+			sin6 = (struct sockaddr_in6 *)&iflr->addr;
+			if (sin6->sin6_addr.s6_addr32[2] != 0 ||
+			    sin6->sin6_addr.s6_addr32[3] != 0) {
+				return EINVAL;
+			}
+		} else
+			prefixlen = iflr->prefixlen;
+
+		/* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
+		bzero(&ifra, sizeof(ifra));
+		bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
+
+		bcopy(&iflr->addr, &ifra.ifra_addr,
+		    ((struct sockaddr *)&iflr->addr)->sa_len);
+		if (hostid) {
+			/* fill in hostid part */
+			ifra.ifra_addr.sin6_addr.s6_addr32[2] =
+			    hostid->s6_addr32[2];
+			ifra.ifra_addr.sin6_addr.s6_addr32[3] =
+			    hostid->s6_addr32[3];
+		}
+
+		if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
+			bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
+			    ((struct sockaddr *)&iflr->dstaddr)->sa_len);
+			if (hostid) {
+				ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
+				    hostid->s6_addr32[2];
+				ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
+				    hostid->s6_addr32[3];
+			}
+		}
+		if (ifa != NULL)
+			ifa_free(ifa);
+
+		ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
+		in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
+
+		ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
+		return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
+	    }
+	case SIOCGLIFADDR:
+	case SIOCDLIFADDR:
+	    {
+		struct in6_ifaddr *ia;
+		struct in6_addr mask, candidate, match;
+		struct sockaddr_in6 *sin6;
+		int cmp;
+
+		bzero(&mask, sizeof(mask));
+		if (iflr->flags & IFLR_PREFIX) {
+			/* lookup a prefix rather than address. */
+			in6_prefixlen2mask(&mask, iflr->prefixlen);
+
+			sin6 = (struct sockaddr_in6 *)&iflr->addr;
+			bcopy(&sin6->sin6_addr, &match, sizeof(match));
+			match.s6_addr32[0] &= mask.s6_addr32[0];
+			match.s6_addr32[1] &= mask.s6_addr32[1];
+			match.s6_addr32[2] &= mask.s6_addr32[2];
+			match.s6_addr32[3] &= mask.s6_addr32[3];
+
+			/* if you set extra bits, that's wrong */
+			if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
+				return EINVAL;
+
+			cmp = 1;
+		} else {
+			if (cmd == SIOCGLIFADDR) {
+				/* on getting an address, take the 1st match */
+				cmp = 0;	/* XXX */
+			} else {
+				/* on deleting an address, do exact match */
+				in6_prefixlen2mask(&mask, 128);
+				sin6 = (struct sockaddr_in6 *)&iflr->addr;
+				bcopy(&sin6->sin6_addr, &match, sizeof(match));
+
+				cmp = 1;
+			}
+		}
+
+		IF_ADDR_LOCK(ifp);
+		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+			if (ifa->ifa_addr->sa_family != AF_INET6)
+				continue;
+			if (!cmp)
+				break;
+
+			/*
+			 * XXX: this is adhoc, but is necessary to allow
+			 * a user to specify fe80::/64 (not /10) for a
+			 * link-local address.
+			 */
+			bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
+			in6_clearscope(&candidate);
+			candidate.s6_addr32[0] &= mask.s6_addr32[0];
+			candidate.s6_addr32[1] &= mask.s6_addr32[1];
+			candidate.s6_addr32[2] &= mask.s6_addr32[2];
+			candidate.s6_addr32[3] &= mask.s6_addr32[3];
+			if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
+				break;
+		}
+		IF_ADDR_UNLOCK(ifp);
+		if (!ifa)
+			return EADDRNOTAVAIL;
+		ia = ifa2ia6(ifa);
+
+		if (cmd == SIOCGLIFADDR) {
+			int error;
+
+			/* fill in the if_laddrreq structure */
+			bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
+			error = sa6_recoverscope(
+			    (struct sockaddr_in6 *)&iflr->addr);
+			if (error != 0)
+				return (error);
+
+			if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
+				bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
+				    ia->ia_dstaddr.sin6_len);
+				error = sa6_recoverscope(
+				    (struct sockaddr_in6 *)&iflr->dstaddr);
+				if (error != 0)
+					return (error);
+			} else
+				bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
+
+			iflr->prefixlen =
+			    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
+
+			iflr->flags = ia->ia6_flags;	/* XXX */
+
+			return 0;
+		} else {
+			struct in6_aliasreq ifra;
+
+			/* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
+			bzero(&ifra, sizeof(ifra));
+			bcopy(iflr->iflr_name, ifra.ifra_name,
+			    sizeof(ifra.ifra_name));
+
+			bcopy(&ia->ia_addr, &ifra.ifra_addr,
+			    ia->ia_addr.sin6_len);
+			if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
+				bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
+				    ia->ia_dstaddr.sin6_len);
+			} else {
+				bzero(&ifra.ifra_dstaddr,
+				    sizeof(ifra.ifra_dstaddr));
+			}
+			bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
+			    ia->ia_prefixmask.sin6_len);
+
+			ifra.ifra_flags = ia->ia6_flags;
+			return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
+			    ifp, td);
+		}
+	    }
+	}
+
+	return EOPNOTSUPP;	/* just for safety */
+}
+
+/*
+ * Initialize an interface's intetnet6 address
+ * and routing table entry.
+ */
+static int
+in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
+    struct sockaddr_in6 *sin6, int newhost)
+{
+	int	error = 0, plen, ifacount = 0;
+	int	s = splimp();
+	struct ifaddr *ifa;
+
+	/*
+	 * Give the interface a chance to initialize
+	 * if this is its first address,
+	 * and to validate the address if necessary.
+	 */
+	IF_ADDR_LOCK(ifp);
+	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+		if (ifa->ifa_addr->sa_family != AF_INET6)
+			continue;
+		ifacount++;
+	}
+	IF_ADDR_UNLOCK(ifp);
+
+	ia->ia_addr = *sin6;
+
+	if (ifacount <= 1 && ifp->if_ioctl) {
+		error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
+		if (error) {
+			splx(s);
+			return (error);
+		}
+	}
+	splx(s);
+
+	ia->ia_ifa.ifa_metric = ifp->if_metric;
+
+	/* we could do in(6)_socktrim here, but just omit it at this moment. */
+
+	/*
+	 * Special case:
+	 * If a new destination address is specified for a point-to-point
+	 * interface, install a route to the destination as an interface
+	 * direct route. 
+	 * XXX: the logic below rejects assigning multiple addresses on a p2p
+	 * interface that share the same destination.
+	 */
+	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
+	if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
+	    ia->ia_dstaddr.sin6_family == AF_INET6) {
+		int rtflags = RTF_UP | RTF_HOST;
+
+		error = rtrequest(RTM_ADD,
+		    (struct sockaddr *)&ia->ia_dstaddr,
+		    (struct sockaddr *)&ia->ia_addr,
+		    (struct sockaddr *)&ia->ia_prefixmask,
+		    ia->ia_flags | rtflags, NULL);
+		if (error != 0)
+			return (error);
+		ia->ia_flags |= IFA_ROUTE;
+	}
+
+	/*
+	 * add a loopback route to self
+	 */
+	if (!(ia->ia_flags & IFA_ROUTE)
+	    && (V_nd6_useloopback
+		|| (ifp->if_flags & IFF_LOOPBACK))) {
+		error = ifa_add_loopback_route((struct ifaddr *)ia,
+				       (struct sockaddr *)&ia->ia_addr);
+		if (error == 0)
+			ia->ia_flags |= IFA_RTSELF;
+	}
+
+	/* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
+	if (newhost) {
+		struct llentry *ln;
+		struct rtentry rt;
+		struct sockaddr_dl gateway;
+		struct sockaddr_in6 mask, addr;
+
+		IF_AFDATA_LOCK(ifp);
+		ia->ia_ifa.ifa_rtrequest = NULL;
+
+		/* XXX QL
+		 * we need to report rt_newaddrmsg
+		 */
+		ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR | LLE_EXCLUSIVE),
+		    (struct sockaddr *)&ia->ia_addr);
+		IF_AFDATA_UNLOCK(ifp);
+		if (ln != NULL) {
+			ln->la_expire = 0;  /* for IPv6 this means permanent */
+			ln->ln_state = ND6_LLINFO_REACHABLE;
+			/*
+			 * initialize for rtmsg generation
+			 */
+			bzero(&gateway, sizeof(gateway));
+			gateway.sdl_len = sizeof(gateway);
+			gateway.sdl_family = AF_LINK;
+			gateway.sdl_nlen = 0;
+			gateway.sdl_alen = 6;
+			memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned, sizeof(ln->ll_addr));
+			/* */
+			LLE_WUNLOCK(ln);
+		}
+
+		bzero(&rt, sizeof(rt));
+		rt.rt_gateway = (struct sockaddr *)&gateway;
+		memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
+		memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
+		rt_mask(&rt) = (struct sockaddr *)&mask;
+		rt_key(&rt) = (struct sockaddr *)&addr;
+		rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC;
+		rt_newaddrmsg(RTM_ADD, &ia->ia_ifa, 0, &rt);
+	}
+
+	return (error);
+}
+
+/*
+ * Find an IPv6 interface link-local address specific to an interface.
+ * ifaddr is returned referenced.
+ */
+struct in6_ifaddr *
+in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
+{
+	struct ifaddr *ifa;
+
+	IF_ADDR_LOCK(ifp);
+	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+		if (ifa->ifa_addr->sa_family != AF_INET6)
+			continue;
+		if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
+			if ((((struct in6_ifaddr *)ifa)->ia6_flags &
+			     ignoreflags) != 0)
+				continue;
+			ifa_ref(ifa);
+			break;
+		}
+	}
+	IF_ADDR_UNLOCK(ifp);
+
+	return ((struct in6_ifaddr *)ifa);
+}
+
+
+/*
+ * find the internet address corresponding to a given interface and address.
+ * ifaddr is returned referenced.
+ */
+struct in6_ifaddr *
+in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
+{
+	struct ifaddr *ifa;
+
+	IF_ADDR_LOCK(ifp);
+	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+		if (ifa->ifa_addr->sa_family != AF_INET6)
+			continue;
+		if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
+			ifa_ref(ifa);
+			break;
+		}
+	}
+	IF_ADDR_UNLOCK(ifp);
+
+	return ((struct in6_ifaddr *)ifa);
+}
+
+/*
+ * Convert IP6 address to printable (loggable) representation. Caller
+ * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
+ */
+static char digits[] = "0123456789abcdef";
+char *
+ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
+{
+	int i;
+	char *cp;
+	const u_int16_t *a = (const u_int16_t *)addr;
+	const u_int8_t *d;
+	int dcolon = 0, zero = 0;
+
+	cp = ip6buf;
+
+	for (i = 0; i < 8; i++) {
+		if (dcolon == 1) {
+			if (*a == 0) {
+				if (i == 7)
+					*cp++ = ':';
+				a++;
+				continue;
+			} else
+				dcolon = 2;
+		}
+		if (*a == 0) {
+			if (dcolon == 0 && *(a + 1) == 0) {
+				if (i == 0)
+					*cp++ = ':';
+				*cp++ = ':';
+				dcolon = 1;
+			} else {
+				*cp++ = '0';
+				*cp++ = ':';
+			}
+			a++;
+			continue;
+		}
+		d = (const u_char *)a;
+		/* Try to eliminate leading zeros in printout like in :0001. */
+		zero = 1;
+		*cp = digits[*d >> 4];
+		if (*cp != '0') {
+			zero = 0;
+			cp++;
+		}
+		*cp = digits[*d++ & 0xf];
+		if (zero == 0 || (*cp != '0')) {
+			zero = 0;
+			cp++;
+		}
+		*cp = digits[*d >> 4];
+		if (zero == 0 || (*cp != '0')) {
+			zero = 0;
+			cp++;
+		}
+		*cp++ = digits[*d & 0xf];
+		*cp++ = ':';
+		a++;
+	}
+	*--cp = '\0';
+	return (ip6buf);
+}
+
+int
+in6_localaddr(struct in6_addr *in6)
+{
+	struct in6_ifaddr *ia;
+
+	if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
+		return 1;
+
+	IN6_IFADDR_RLOCK();
+	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
+		if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
+		    &ia->ia_prefixmask.sin6_addr)) {
+			IN6_IFADDR_RUNLOCK();
+			return 1;
+		}
+	}
+	IN6_IFADDR_RUNLOCK();
+
+	return (0);
+}
+
+int
+in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
+{
+	struct in6_ifaddr *ia;
+
+	IN6_IFADDR_RLOCK();
+	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
+		if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
+				       &sa6->sin6_addr) &&
+		    (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) {
+			IN6_IFADDR_RUNLOCK();
+			return (1); /* true */
+		}
+
+		/* XXX: do we still have to go thru the rest of the list? */
+	}
+	IN6_IFADDR_RUNLOCK();
+
+	return (0);		/* false */
+}
+
+/*
+ * return length of part which dst and src are equal
+ * hard coding...
+ */
+int
+in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
+{
+	int match = 0;
+	u_char *s = (u_char *)src, *d = (u_char *)dst;
+	u_char *lim = s + 16, r;
+
+	while (s < lim)
+		if ((r = (*d++ ^ *s++)) != 0) {
+			while (r < 128) {
+				match++;
+				r <<= 1;
+			}
+			break;
+		} else
+			match += 8;
+	return match;
+}
+
+/* XXX: to be scope conscious */
+int
+in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
+{
+	int bytelen, bitlen;
+
+	/* sanity check */
+	if (0 > len || len > 128) {
+		log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
+		    len);
+		return (0);
+	}
+
+	bytelen = len / 8;
+	bitlen = len % 8;
+
+	if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
+		return (0);
+	if (bitlen != 0 &&
+	    p1->s6_addr[bytelen] >> (8 - bitlen) !=
+	    p2->s6_addr[bytelen] >> (8 - bitlen))
+		return (0);
+
+	return (1);
+}
+
+void
+in6_prefixlen2mask(struct in6_addr *maskp, int len)
+{
+	u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
+	int bytelen, bitlen, i;
+
+	/* sanity check */
+	if (0 > len || len > 128) {
+		log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
+		    len);
+		return;
+	}
+
+	bzero(maskp, sizeof(*maskp));
+	bytelen = len / 8;
+	bitlen = len % 8;
+	for (i = 0; i < bytelen; i++)
+		maskp->s6_addr[i] = 0xff;
+	if (bitlen)
+		maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
+}
+
+/*
+ * return the best address out of the same scope. if no address was
+ * found, return the first valid address from designated IF.
+ */
+struct in6_ifaddr *
+in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
+{
+	int dst_scope =	in6_addrscope(dst), blen = -1, tlen;
+	struct ifaddr *ifa;
+	struct in6_ifaddr *besta = 0;
+	struct in6_ifaddr *dep[2];	/* last-resort: deprecated */
+
+	dep[0] = dep[1] = NULL;
+
+	/*
+	 * We first look for addresses in the same scope.
+	 * If there is one, return it.
+	 * If two or more, return one which matches the dst longest.
+	 * If none, return one of global addresses assigned other ifs.
+	 */
+	IF_ADDR_LOCK(ifp);
+	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+		if (ifa->ifa_addr->sa_family != AF_INET6)
+			continue;
+		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
+			continue; /* XXX: is there any case to allow anycast? */
+		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
+			continue; /* don't use this interface */
+		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
+			continue;
+		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
+			if (V_ip6_use_deprecated)
+				dep[0] = (struct in6_ifaddr *)ifa;
+			continue;
+		}
+
+		if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
+			/*
+			 * call in6_matchlen() as few as possible
+			 */
+			if (besta) {
+				if (blen == -1)
+					blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
+				tlen = in6_matchlen(IFA_IN6(ifa), dst);
+				if (tlen > blen) {
+					blen = tlen;
+					besta = (struct in6_ifaddr *)ifa;
+				}
+			} else
+				besta = (struct in6_ifaddr *)ifa;
+		}
+	}
+	if (besta) {
+		ifa_ref(&besta->ia_ifa);
+		IF_ADDR_UNLOCK(ifp);
+		return (besta);
+	}
+	IF_ADDR_UNLOCK(ifp);
+
+	IN6_IFADDR_RLOCK();
+	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+		if (ifa->ifa_addr->sa_family != AF_INET6)
+			continue;
+		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
+			continue; /* XXX: is there any case to allow anycast? */
+		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
+			continue; /* don't use this interface */
+		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
+			continue;
+		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
+			if (V_ip6_use_deprecated)
+				dep[1] = (struct in6_ifaddr *)ifa;
+			continue;
+		}
+
+		if (ifa != NULL)
+			ifa_ref(ifa);
+		IN6_IFADDR_RUNLOCK();
+		return (struct in6_ifaddr *)ifa;
+	}
+	IN6_IFADDR_RUNLOCK();
+
+	/* use the last-resort values, that are, deprecated addresses */
+	if (dep[0])
+		return dep[0];
+	if (dep[1])
+		return dep[1];
+
+	return NULL;
+}
+
+/*
+ * perform DAD when interface becomes IFF_UP.
+ */
+void
+in6_if_up(struct ifnet *ifp)
+{
+	struct ifaddr *ifa;
+	struct in6_ifaddr *ia;
+
+	IF_ADDR_LOCK(ifp);
+	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+		if (ifa->ifa_addr->sa_family != AF_INET6)
+			continue;
+		ia = (struct in6_ifaddr *)ifa;
+		if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
+			/*
+			 * The TENTATIVE flag was likely set by hand
+			 * beforehand, implicitly indicating the need for DAD.
+			 * We may be able to skip the random delay in this
+			 * case, but we impose delays just in case.
+			 */
+			nd6_dad_start(ifa,
+			    arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
+		}
+	}
+	IF_ADDR_UNLOCK(ifp);
+
+	/*
+	 * special cases, like 6to4, are handled in in6_ifattach
+	 */
+	in6_ifattach(ifp, NULL);
+}
+
+int
+in6if_do_dad(struct ifnet *ifp)
+{
+	if ((ifp->if_flags & IFF_LOOPBACK) != 0)
+		return (0);
+
+	switch (ifp->if_type) {
+#ifdef IFT_DUMMY
+	case IFT_DUMMY:
+#endif
+	case IFT_FAITH:
+		/*
+		 * These interfaces do not have the IFF_LOOPBACK flag,
+		 * but loop packets back.  We do not have to do DAD on such
+		 * interfaces.  We should even omit it, because loop-backed
+		 * NS would confuse the DAD procedure.
+		 */
+		return (0);
+	default:
+		/*
+		 * Our DAD routine requires the interface up and running.
+		 * However, some interfaces can be up before the RUNNING
+		 * status.  Additionaly, users may try to assign addresses
+		 * before the interface becomes up (or running).
+		 * We simply skip DAD in such a case as a work around.
+		 * XXX: we should rather mark "tentative" on such addresses,
+		 * and do DAD after the interface becomes ready.
+		 */
+		if (!((ifp->if_flags & IFF_UP) &&
+		    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
+			return (0);
+
+		return (1);
+	}
+}
+
+/*
+ * Calculate max IPv6 MTU through all the interfaces and store it
+ * to in6_maxmtu.
+ */
+void
+in6_setmaxmtu(void)
+{
+	unsigned long maxmtu = 0;
+	struct ifnet *ifp;
+
+	IFNET_RLOCK_NOSLEEP();
+	for (ifp = TAILQ_FIRST(&V_ifnet); ifp;
+	    ifp = TAILQ_NEXT(ifp, if_list)) {
+		/* this function can be called during ifnet initialization */
+		if (!ifp->if_afdata[AF_INET6])
+			continue;
+		if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
+		    IN6_LINKMTU(ifp) > maxmtu)
+			maxmtu = IN6_LINKMTU(ifp);
+	}
+	IFNET_RUNLOCK_NOSLEEP();
+	if (maxmtu)	     /* update only when maxmtu is positive */
+		V_in6_maxmtu = maxmtu;
+}
+
+/*
+ * Provide the length of interface identifiers to be used for the link attached
+ * to the given interface.  The length should be defined in "IPv6 over
+ * xxx-link" document.  Note that address architecture might also define
+ * the length for a particular set of address prefixes, regardless of the
+ * link type.  As clarified in rfc2462bis, those two definitions should be
+ * consistent, and those really are as of August 2004.
+ */
+int
+in6_if2idlen(struct ifnet *ifp)
+{
+	switch (ifp->if_type) {
+	case IFT_ETHER:		/* RFC2464 */
+#ifdef IFT_PROPVIRTUAL
+	case IFT_PROPVIRTUAL:	/* XXX: no RFC. treat it as ether */
+#endif
+#ifdef IFT_L2VLAN
+	case IFT_L2VLAN:	/* ditto */
+#endif
+#ifdef IFT_IEEE80211
+	case IFT_IEEE80211:	/* ditto */
+#endif
+#ifdef IFT_MIP
+	case IFT_MIP:	/* ditto */
+#endif
+		return (64);
+	case IFT_FDDI:		/* RFC2467 */
+		return (64);
+	case IFT_ISO88025:	/* RFC2470 (IPv6 over Token Ring) */
+		return (64);
+	case IFT_PPP:		/* RFC2472 */
+		return (64);
+	case IFT_ARCNET:	/* RFC2497 */
+		return (64);
+	case IFT_FRELAY:	/* RFC2590 */
+		return (64);
+	case IFT_IEEE1394:	/* RFC3146 */
+		return (64);
+	case IFT_GIF:
+		return (64);	/* draft-ietf-v6ops-mech-v2-07 */
+	case IFT_LOOP:
+		return (64);	/* XXX: is this really correct? */
+	default:
+		/*
+		 * Unknown link type:
+		 * It might be controversial to use the today's common constant
+		 * of 64 for these cases unconditionally.  For full compliance,
+		 * we should return an error in this case.  On the other hand,
+		 * if we simply miss the standard for the link type or a new
+		 * standard is defined for a new link type, the IFID length
+		 * is very likely to be the common constant.  As a compromise,
+		 * we always use the constant, but make an explicit notice
+		 * indicating the "unknown" case.
+		 */
+		printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
+		return (64);
+	}
+}
+
+#include <freebsd/sys/sysctl.h>
+
+struct in6_llentry {
+	struct llentry		base;
+	struct sockaddr_in6	l3_addr6;
+};
+
+static struct llentry *
+in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
+{
+	struct in6_llentry *lle;
+
+	lle = malloc(sizeof(struct in6_llentry), M_LLTABLE,
+	    M_DONTWAIT | M_ZERO);
+	if (lle == NULL)		/* NB: caller generates msg */
+		return NULL;
+
+	lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
+	lle->base.lle_refcnt = 1;
+	LLE_LOCK_INIT(&lle->base);
+	callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock,
+	    CALLOUT_RETURNUNLOCKED);
+
+	return &lle->base;
+}
+
+/*
+ * Deletes an address from the address table.
+ * This function is called by the timer functions
+ * such as arptimer() and nd6_llinfo_timer(), and
+ * the caller does the locking.
+ */
+static void
+in6_lltable_free(struct lltable *llt, struct llentry *lle)
+{
+	LLE_WUNLOCK(lle);
+	LLE_LOCK_DESTROY(lle);
+	free(lle, M_LLTABLE);
+}
+
+static void
+in6_lltable_prefix_free(struct lltable *llt, 
+			const struct sockaddr *prefix,
+			const struct sockaddr *mask)
+{
+	const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
+	const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
+	struct llentry *lle, *next;
+	register int i;
+
+	for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
+		LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
+			if (IN6_ARE_MASKED_ADDR_EQUAL(
+				    &((struct sockaddr_in6 *)L3_ADDR(lle))->sin6_addr, 
+				    &pfx->sin6_addr, 
+				    &msk->sin6_addr)) {
+				int canceled;
+
+				canceled = callout_drain(&lle->la_timer);
+				LLE_WLOCK(lle);
+				if (canceled)
+					LLE_REMREF(lle);
+				llentry_free(lle);
+			}
+		}
+	}
+}
+
+static int
+in6_lltable_rtcheck(struct ifnet *ifp, 
+		    u_int flags, 
+		    const struct sockaddr *l3addr)
+{
+	struct rtentry *rt;
+	char ip6buf[INET6_ADDRSTRLEN];
+
+	KASSERT(l3addr->sa_family == AF_INET6,
+	    ("sin_family %d", l3addr->sa_family));
+
+	/* XXX rtalloc1 should take a const param */
+	rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0);
+	if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
+		struct ifaddr *ifa;
+		/* 
+		 * Create an ND6 cache for an IPv6 neighbor 
+		 * that is not covered by our own prefix.
+		 */
+		/* XXX ifaof_ifpforaddr should take a const param */
+		ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
+		if (ifa != NULL) {
+			ifa_free(ifa);
+			if (rt != NULL)
+				RTFREE_LOCKED(rt);
+			return 0;
+		}
+		log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
+		    ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
+		if (rt != NULL)
+			RTFREE_LOCKED(rt);
+		return EINVAL;
+	}
+	RTFREE_LOCKED(rt);
+	return 0;
+}
+
+static struct llentry *
+in6_lltable_lookup(struct lltable *llt, u_int flags,
+	const struct sockaddr *l3addr)
+{
+	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
+	struct ifnet *ifp = llt->llt_ifp;
+	struct llentry *lle;
+	struct llentries *lleh;
+	u_int hashkey;
+
+	IF_AFDATA_LOCK_ASSERT(ifp);
+	KASSERT(l3addr->sa_family == AF_INET6,
+	    ("sin_family %d", l3addr->sa_family));
+
+	hashkey = sin6->sin6_addr.s6_addr32[3];
+	lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
+	LIST_FOREACH(lle, lleh, lle_next) {
+		struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
+		if (lle->la_flags & LLE_DELETED)
+			continue;
+		if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 
+			 sizeof(struct in6_addr)) == 0)
+			break;
+	}
+
+	if (lle == NULL) {
+		if (!(flags & LLE_CREATE))
+			return (NULL);
+		/*
+		 * A route that covers the given address must have
+		 * been installed 1st because we are doing a resolution,
+		 * verify this.
+		 */
+		if (!(flags & LLE_IFADDR) &&
+		    in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
+			return NULL;
+
+		lle = in6_lltable_new(l3addr, flags);
+		if (lle == NULL) {
+			log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
+			return NULL;
+		}
+		lle->la_flags = flags & ~LLE_CREATE;
+		if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
+			bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
+			lle->la_flags |= (LLE_VALID | LLE_STATIC);
+		}
+
+		lle->lle_tbl  = llt;
+		lle->lle_head = lleh;
+		LIST_INSERT_HEAD(lleh, lle, lle_next);
+	} else if (flags & LLE_DELETE) {
+		if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
+			LLE_WLOCK(lle);
+			lle->la_flags = LLE_DELETED;
+			LLE_WUNLOCK(lle);
+#ifdef DIAGNOSTIC
+			log(LOG_INFO, "ifaddr cache = %p  is deleted\n", lle);	
+#endif	
+		}
+		lle = (void *)-1;
+	}
+	if (LLE_IS_VALID(lle)) {
+		if (flags & LLE_EXCLUSIVE)
+			LLE_WLOCK(lle);
+		else
+			LLE_RLOCK(lle);
+	}
+	return (lle);
+}
+
+static int
+in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
+{
+	struct ifnet *ifp = llt->llt_ifp;
+	struct llentry *lle;
+	/* XXX stack use */
+	struct {
+		struct rt_msghdr	rtm;
+		struct sockaddr_in6	sin6;
+		/*
+		 * ndp.c assumes that sdl is word aligned
+		 */
+#ifdef __LP64__
+		uint32_t		pad;
+#endif
+		struct sockaddr_dl	sdl;
+	} ndpc;
+	int i, error;
+
+	if (ifp->if_flags & IFF_LOOPBACK)
+		return 0;
+
+	LLTABLE_LOCK_ASSERT();
+
+	error = 0;
+	for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
+		LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
+			struct sockaddr_dl *sdl;
+
+			/* skip deleted or invalid entries */
+			if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
+				continue;
+			/* Skip if jailed and not a valid IP of the prison. */
+			if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
+				continue;
+			/*
+			 * produce a msg made of:
+			 *  struct rt_msghdr;
+			 *  struct sockaddr_in6 (IPv6)
+			 *  struct sockaddr_dl;
+			 */
+			bzero(&ndpc, sizeof(ndpc));
+			ndpc.rtm.rtm_msglen = sizeof(ndpc);
+			ndpc.rtm.rtm_version = RTM_VERSION;
+			ndpc.rtm.rtm_type = RTM_GET;
+			ndpc.rtm.rtm_flags = RTF_UP;
+			ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
+			ndpc.sin6.sin6_family = AF_INET6;
+			ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
+			bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
+
+			/* publish */
+			if (lle->la_flags & LLE_PUB)
+				ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
+
+			sdl = &ndpc.sdl;
+			sdl->sdl_family = AF_LINK;
+			sdl->sdl_len = sizeof(*sdl);
+			sdl->sdl_alen = ifp->if_addrlen;
+			sdl->sdl_index = ifp->if_index;
+			sdl->sdl_type = ifp->if_type;
+			bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
+			ndpc.rtm.rtm_rmx.rmx_expire =
+			    lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
+			ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
+			if (lle->la_flags & LLE_STATIC)
+				ndpc.rtm.rtm_flags |= RTF_STATIC;
+			ndpc.rtm.rtm_index = ifp->if_index;
+			error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
+			if (error)
+				break;
+		}
+	}
+	return error;
+}
+
+void *
+in6_domifattach(struct ifnet *ifp)
+{
+	struct in6_ifextra *ext;
+
+	ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
+	bzero(ext, sizeof(*ext));
+
+	ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
+	    M_IFADDR, M_WAITOK);
+	bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
+
+	ext->icmp6_ifstat =
+	    (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
+	    M_IFADDR, M_WAITOK);
+	bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
+
+	ext->nd_ifinfo = nd6_ifattach(ifp);
+	ext->scope6_id = scope6_ifattach(ifp);
+	ext->lltable = lltable_init(ifp, AF_INET6);
+	if (ext->lltable != NULL) {
+		ext->lltable->llt_new = in6_lltable_new;
+		ext->lltable->llt_free = in6_lltable_free;
+		ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
+		ext->lltable->llt_rtcheck = in6_lltable_rtcheck;
+		ext->lltable->llt_lookup = in6_lltable_lookup;
+		ext->lltable->llt_dump = in6_lltable_dump;
+	}
+
+	ext->mld_ifinfo = mld_domifattach(ifp);
+
+	return ext;
+}
+
+void
+in6_domifdetach(struct ifnet *ifp, void *aux)
+{
+	struct in6_ifextra *ext = (struct in6_ifextra *)aux;
+
+	mld_domifdetach(ifp);
+	scope6_ifdetach(ext->scope6_id);
+	nd6_ifdetach(ext->nd_ifinfo);
+	lltable_free(ext->lltable);
+	free(ext->in6_ifstat, M_IFADDR);
+	free(ext->icmp6_ifstat, M_IFADDR);
+	free(ext, M_IFADDR);
+}
+
+/*
+ * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
+ * v4 mapped addr or v4 compat addr
+ */
+void
+in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
+{
+
+	bzero(sin, sizeof(*sin));
+	sin->sin_len = sizeof(struct sockaddr_in);
+	sin->sin_family = AF_INET;
+	sin->sin_port = sin6->sin6_port;
+	sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
+}
+
+/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
+void
+in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
+{
+	bzero(sin6, sizeof(*sin6));
+	sin6->sin6_len = sizeof(struct sockaddr_in6);
+	sin6->sin6_family = AF_INET6;
+	sin6->sin6_port = sin->sin_port;
+	sin6->sin6_addr.s6_addr32[0] = 0;
+	sin6->sin6_addr.s6_addr32[1] = 0;
+	sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
+	sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
+}
+
+/* Convert sockaddr_in6 into sockaddr_in. */
+void
+in6_sin6_2_sin_in_sock(struct sockaddr *nam)
+{
+	struct sockaddr_in *sin_p;
+	struct sockaddr_in6 sin6;
+
+	/*
+	 * Save original sockaddr_in6 addr and convert it
+	 * to sockaddr_in.
+	 */
+	sin6 = *(struct sockaddr_in6 *)nam;
+	sin_p = (struct sockaddr_in *)nam;
+	in6_sin6_2_sin(sin_p, &sin6);
+}
+
+/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
+void
+in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
+{
+	struct sockaddr_in *sin_p;
+	struct sockaddr_in6 *sin6_p;
+
+	sin6_p = malloc(sizeof *sin6_p, M_SONAME,
+	       M_WAITOK);
+	sin_p = (struct sockaddr_in *)*nam;
+	in6_sin_2_v4mapsin6(sin_p, sin6_p);
+	free(*nam, M_SONAME);
+	*nam = (struct sockaddr *)sin6_p;
+}