Move files to match FreeBSD layout

1 files changed, 971 insertions, 0 deletions

diff --git a/freebsd/sys/netinet6/in6_ifattach.c b/freebsd/sys/netinet6/in6_ifattach.c
new file mode 100644
index 00000000..7942d5af
--- /dev/null
+++ b/freebsd/sys/netinet6/in6_ifattach.c
@@ -0,0 +1,971 @@
+#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_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $
+ */
+
+#include <freebsd/sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <freebsd/sys/param.h>
+#include <freebsd/sys/systm.h>
+#include <freebsd/sys/malloc.h>
+#include <freebsd/sys/socket.h>
+#include <freebsd/sys/sockio.h>
+#include <freebsd/sys/jail.h>
+#include <freebsd/sys/kernel.h>
+#include <freebsd/sys/proc.h>
+#include <freebsd/sys/syslog.h>
+#include <freebsd/sys/md5.h>
+
+#include <freebsd/net/if.h>
+#include <freebsd/net/if_dl.h>
+#include <freebsd/net/if_types.h>
+#include <freebsd/net/route.h>
+#include <freebsd/net/vnet.h>
+
+#include <freebsd/netinet/in.h>
+#include <freebsd/netinet/in_var.h>
+#include <freebsd/netinet/if_ether.h>
+#include <freebsd/netinet/in_pcb.h>
+#include <freebsd/netinet/ip_var.h>
+#include <freebsd/netinet/udp.h>
+#include <freebsd/netinet/udp_var.h>
+
+#include <freebsd/netinet/ip6.h>
+#include <freebsd/netinet6/ip6_var.h>
+#include <freebsd/netinet6/in6_var.h>
+#include <freebsd/netinet6/in6_pcb.h>
+#include <freebsd/netinet6/in6_ifattach.h>
+#include <freebsd/netinet6/ip6_var.h>
+#include <freebsd/netinet6/nd6.h>
+#include <freebsd/netinet6/mld6_var.h>
+#include <freebsd/netinet6/scope6_var.h>
+
+VNET_DEFINE(unsigned long, in6_maxmtu) = 0;
+
+#ifdef IP6_AUTO_LINKLOCAL
+VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL;
+#else
+VNET_DEFINE(int, ip6_auto_linklocal) = 1;	/* enabled by default */
+#endif
+
+VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch);
+#define	V_in6_tmpaddrtimer_ch		VNET(in6_tmpaddrtimer_ch)
+
+VNET_DECLARE(struct inpcbinfo, ripcbinfo);
+#define	V_ripcbinfo			VNET(ripcbinfo)
+
+static int get_rand_ifid(struct ifnet *, struct in6_addr *);
+static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
+static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
+static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
+static int in6_ifattach_loopback(struct ifnet *);
+static void in6_purgemaddrs(struct ifnet *);
+
+#define EUI64_GBIT	0x01
+#define EUI64_UBIT	0x02
+#define EUI64_TO_IFID(in6)	do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
+#define EUI64_GROUP(in6)	((in6)->s6_addr[8] & EUI64_GBIT)
+#define EUI64_INDIVIDUAL(in6)	(!EUI64_GROUP(in6))
+#define EUI64_LOCAL(in6)	((in6)->s6_addr[8] & EUI64_UBIT)
+#define EUI64_UNIVERSAL(in6)	(!EUI64_LOCAL(in6))
+
+#define IFID_LOCAL(in6)		(!EUI64_LOCAL(in6))
+#define IFID_UNIVERSAL(in6)	(!EUI64_UNIVERSAL(in6))
+
+/*
+ * Generate a last-resort interface identifier, when the machine has no
+ * IEEE802/EUI64 address sources.
+ * The goal here is to get an interface identifier that is
+ * (1) random enough and (2) does not change across reboot.
+ * We currently use MD5(hostname) for it.
+ *
+ * in6 - upper 64bits are preserved
+ */
+static int
+get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
+{
+	MD5_CTX ctxt;
+	struct prison *pr;
+	u_int8_t digest[16];
+	int hostnamelen;
+
+	pr = curthread->td_ucred->cr_prison;
+	mtx_lock(&pr->pr_mtx);
+	hostnamelen = strlen(pr->pr_hostname);
+#if 0
+	/* we need at least several letters as seed for ifid */
+	if (hostnamelen < 3) {
+		mtx_unlock(&pr->pr_mtx);
+		return -1;
+	}
+#endif
+
+	/* generate 8 bytes of pseudo-random value. */
+	bzero(&ctxt, sizeof(ctxt));
+	MD5Init(&ctxt);
+	MD5Update(&ctxt, pr->pr_hostname, hostnamelen);
+	mtx_unlock(&pr->pr_mtx);
+	MD5Final(digest, &ctxt);
+
+	/* assumes sizeof(digest) > sizeof(ifid) */
+	bcopy(digest, &in6->s6_addr[8], 8);
+
+	/* make sure to set "u" bit to local, and "g" bit to individual. */
+	in6->s6_addr[8] &= ~EUI64_GBIT;	/* g bit to "individual" */
+	in6->s6_addr[8] |= EUI64_UBIT;	/* u bit to "local" */
+
+	/* convert EUI64 into IPv6 interface identifier */
+	EUI64_TO_IFID(in6);
+
+	return 0;
+}
+
+static int
+generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
+{
+	MD5_CTX ctxt;
+	u_int8_t seed[16], digest[16], nullbuf[8];
+	u_int32_t val32;
+
+	/* If there's no history, start with a random seed. */
+	bzero(nullbuf, sizeof(nullbuf));
+	if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
+		int i;
+
+		for (i = 0; i < 2; i++) {
+			val32 = arc4random();
+			bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
+		}
+	} else
+		bcopy(seed0, seed, 8);
+
+	/* copy the right-most 64-bits of the given address */
+	/* XXX assumption on the size of IFID */
+	bcopy(seed1, &seed[8], 8);
+
+	if (0) {		/* for debugging purposes only */
+		int i;
+
+		printf("generate_tmp_ifid: new randomized ID from: ");
+		for (i = 0; i < 16; i++)
+			printf("%02x", seed[i]);
+		printf(" ");
+	}
+
+	/* generate 16 bytes of pseudo-random value. */
+	bzero(&ctxt, sizeof(ctxt));
+	MD5Init(&ctxt);
+	MD5Update(&ctxt, seed, sizeof(seed));
+	MD5Final(digest, &ctxt);
+
+	/*
+	 * RFC 3041 3.2.1. (3)
+	 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
+	 * left-most bit is numbered 0) to zero.
+	 */
+	bcopy(digest, ret, 8);
+	ret[0] &= ~EUI64_UBIT;
+
+	/*
+	 * XXX: we'd like to ensure that the generated value is not zero
+	 * for simplicity.  If the caclculated digest happens to be zero,
+	 * use a random non-zero value as the last resort.
+	 */
+	if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
+		nd6log((LOG_INFO,
+		    "generate_tmp_ifid: computed MD5 value is zero.\n"));
+
+		val32 = arc4random();
+		val32 = 1 + (val32 % (0xffffffff - 1));
+	}
+
+	/*
+	 * RFC 3041 3.2.1. (4)
+	 * Take the rightmost 64-bits of the MD5 digest and save them in
+	 * stable storage as the history value to be used in the next
+	 * iteration of the algorithm.
+	 */
+	bcopy(&digest[8], seed0, 8);
+
+	if (0) {		/* for debugging purposes only */
+		int i;
+
+		printf("to: ");
+		for (i = 0; i < 16; i++)
+			printf("%02x", digest[i]);
+		printf("\n");
+	}
+
+	return 0;
+}
+
+/*
+ * Get interface identifier for the specified interface.
+ * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
+ *
+ * in6 - upper 64bits are preserved
+ */
+int
+in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
+{
+	struct ifaddr *ifa;
+	struct sockaddr_dl *sdl;
+	u_int8_t *addr;
+	size_t addrlen;
+	static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
+	static u_int8_t allone[8] =
+		{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+
+	IF_ADDR_LOCK(ifp);
+	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+		if (ifa->ifa_addr->sa_family != AF_LINK)
+			continue;
+		sdl = (struct sockaddr_dl *)ifa->ifa_addr;
+		if (sdl == NULL)
+			continue;
+		if (sdl->sdl_alen == 0)
+			continue;
+
+		goto found;
+	}
+	IF_ADDR_UNLOCK(ifp);
+
+	return -1;
+
+found:
+	IF_ADDR_LOCK_ASSERT(ifp);
+	addr = LLADDR(sdl);
+	addrlen = sdl->sdl_alen;
+
+	/* get EUI64 */
+	switch (ifp->if_type) {
+	case IFT_ETHER:
+	case IFT_FDDI:
+	case IFT_ISO88025:
+	case IFT_ATM:
+	case IFT_IEEE1394:
+#ifdef IFT_IEEE80211
+	case IFT_IEEE80211:
+#endif
+		/* IEEE802/EUI64 cases - what others? */
+		/* IEEE1394 uses 16byte length address starting with EUI64 */
+		if (addrlen > 8)
+			addrlen = 8;
+
+		/* look at IEEE802/EUI64 only */
+		if (addrlen != 8 && addrlen != 6) {
+			IF_ADDR_UNLOCK(ifp);
+			return -1;
+		}
+
+		/*
+		 * check for invalid MAC address - on bsdi, we see it a lot
+		 * since wildboar configures all-zero MAC on pccard before
+		 * card insertion.
+		 */
+		if (bcmp(addr, allzero, addrlen) == 0) {
+			IF_ADDR_UNLOCK(ifp);
+			return -1;
+		}
+		if (bcmp(addr, allone, addrlen) == 0) {
+			IF_ADDR_UNLOCK(ifp);
+			return -1;
+		}
+
+		/* make EUI64 address */
+		if (addrlen == 8)
+			bcopy(addr, &in6->s6_addr[8], 8);
+		else if (addrlen == 6) {
+			in6->s6_addr[8] = addr[0];
+			in6->s6_addr[9] = addr[1];
+			in6->s6_addr[10] = addr[2];
+			in6->s6_addr[11] = 0xff;
+			in6->s6_addr[12] = 0xfe;
+			in6->s6_addr[13] = addr[3];
+			in6->s6_addr[14] = addr[4];
+			in6->s6_addr[15] = addr[5];
+		}
+		break;
+
+	case IFT_ARCNET:
+		if (addrlen != 1) {
+			IF_ADDR_UNLOCK(ifp);
+			return -1;
+		}
+		if (!addr[0]) {
+			IF_ADDR_UNLOCK(ifp);
+			return -1;
+		}
+
+		bzero(&in6->s6_addr[8], 8);
+		in6->s6_addr[15] = addr[0];
+
+		/*
+		 * due to insufficient bitwidth, we mark it local.
+		 */
+		in6->s6_addr[8] &= ~EUI64_GBIT;	/* g bit to "individual" */
+		in6->s6_addr[8] |= EUI64_UBIT;	/* u bit to "local" */
+		break;
+
+	case IFT_GIF:
+#ifdef IFT_STF
+	case IFT_STF:
+#endif
+		/*
+		 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
+		 * however, IPv4 address is not very suitable as unique
+		 * identifier source (can be renumbered).
+		 * we don't do this.
+		 */
+		IF_ADDR_UNLOCK(ifp);
+		return -1;
+
+	default:
+		IF_ADDR_UNLOCK(ifp);
+		return -1;
+	}
+
+	/* sanity check: g bit must not indicate "group" */
+	if (EUI64_GROUP(in6)) {
+		IF_ADDR_UNLOCK(ifp);
+		return -1;
+	}
+
+	/* convert EUI64 into IPv6 interface identifier */
+	EUI64_TO_IFID(in6);
+
+	/*
+	 * sanity check: ifid must not be all zero, avoid conflict with
+	 * subnet router anycast
+	 */
+	if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
+	    bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
+		IF_ADDR_UNLOCK(ifp);
+		return -1;
+	}
+
+	IF_ADDR_UNLOCK(ifp);
+	return 0;
+}
+
+/*
+ * Get interface identifier for the specified interface.  If it is not
+ * available on ifp0, borrow interface identifier from other information
+ * sources.
+ *
+ * altifp - secondary EUI64 source
+ */
+static int
+get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
+    struct in6_addr *in6)
+{
+	struct ifnet *ifp;
+
+	/* first, try to get it from the interface itself */
+	if (in6_get_hw_ifid(ifp0, in6) == 0) {
+		nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
+		    if_name(ifp0)));
+		goto success;
+	}
+
+	/* try secondary EUI64 source. this basically is for ATM PVC */
+	if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
+		nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
+		    if_name(ifp0), if_name(altifp)));
+		goto success;
+	}
+
+	/* next, try to get it from some other hardware interface */
+	IFNET_RLOCK_NOSLEEP();
+	for (ifp = V_ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) {
+		if (ifp == ifp0)
+			continue;
+		if (in6_get_hw_ifid(ifp, in6) != 0)
+			continue;
+
+		/*
+		 * to borrow ifid from other interface, ifid needs to be
+		 * globally unique
+		 */
+		if (IFID_UNIVERSAL(in6)) {
+			nd6log((LOG_DEBUG,
+			    "%s: borrow interface identifier from %s\n",
+			    if_name(ifp0), if_name(ifp)));
+			IFNET_RUNLOCK_NOSLEEP();
+			goto success;
+		}
+	}
+	IFNET_RUNLOCK_NOSLEEP();
+
+	/* last resort: get from random number source */
+	if (get_rand_ifid(ifp, in6) == 0) {
+		nd6log((LOG_DEBUG,
+		    "%s: interface identifier generated by random number\n",
+		    if_name(ifp0)));
+		goto success;
+	}
+
+	printf("%s: failed to get interface identifier\n", if_name(ifp0));
+	return -1;
+
+success:
+	nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
+	    if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
+	    in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
+	    in6->s6_addr[14], in6->s6_addr[15]));
+	return 0;
+}
+
+/*
+ * altifp - secondary EUI64 source
+ */
+static int
+in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
+{
+	struct in6_ifaddr *ia;
+	struct in6_aliasreq ifra;
+	struct nd_prefixctl pr0;
+	int i, error;
+
+	/*
+	 * configure link-local address.
+	 */
+	bzero(&ifra, sizeof(ifra));
+
+	/*
+	 * in6_update_ifa() does not use ifra_name, but we accurately set it
+	 * for safety.
+	 */
+	strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
+
+	ifra.ifra_addr.sin6_family = AF_INET6;
+	ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
+	ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
+	ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
+	if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
+		ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
+		ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
+	} else {
+		if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
+			nd6log((LOG_ERR,
+			    "%s: no ifid available\n", if_name(ifp)));
+			return (-1);
+		}
+	}
+	if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
+		return (-1);
+
+	ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
+	ifra.ifra_prefixmask.sin6_family = AF_INET6;
+	ifra.ifra_prefixmask.sin6_addr = in6mask64;
+	/* link-local addresses should NEVER expire. */
+	ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
+	ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
+
+	/*
+	 * Now call in6_update_ifa() to do a bunch of procedures to configure
+	 * a link-local address. We can set the 3rd argument to NULL, because
+	 * we know there's no other link-local address on the interface
+	 * and therefore we are adding one (instead of updating one).
+	 */
+	if ((error = in6_update_ifa(ifp, &ifra, NULL,
+				    IN6_IFAUPDATE_DADDELAY)) != 0) {
+		/*
+		 * XXX: When the interface does not support IPv6, this call
+		 * would fail in the SIOCSIFADDR ioctl.  I believe the
+		 * notification is rather confusing in this case, so just
+		 * suppress it.  (jinmei@kame.net 20010130)
+		 */
+		if (error != EAFNOSUPPORT)
+			nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
+			    "configure a link-local address on %s "
+			    "(errno=%d)\n",
+			    if_name(ifp), error));
+		return (-1);
+	}
+
+	ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
+#ifdef DIAGNOSTIC
+	if (!ia) {
+		panic("ia == NULL in in6_ifattach_linklocal");
+		/* NOTREACHED */
+	}
+#endif
+	ifa_free(&ia->ia_ifa);
+
+	/*
+	 * Make the link-local prefix (fe80::%link/64) as on-link.
+	 * Since we'd like to manage prefixes separately from addresses,
+	 * we make an ND6 prefix structure for the link-local prefix,
+	 * and add it to the prefix list as a never-expire prefix.
+	 * XXX: this change might affect some existing code base...
+	 */
+	bzero(&pr0, sizeof(pr0));
+	pr0.ndpr_ifp = ifp;
+	/* this should be 64 at this moment. */
+	pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
+	pr0.ndpr_prefix = ifra.ifra_addr;
+	/* apply the mask for safety. (nd6_prelist_add will apply it again) */
+	for (i = 0; i < 4; i++) {
+		pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
+		    in6mask64.s6_addr32[i];
+	}
+	/*
+	 * Initialize parameters.  The link-local prefix must always be
+	 * on-link, and its lifetimes never expire.
+	 */
+	pr0.ndpr_raf_onlink = 1;
+	pr0.ndpr_raf_auto = 1;	/* probably meaningless */
+	pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
+	pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
+	/*
+	 * Since there is no other link-local addresses, nd6_prefix_lookup()
+	 * probably returns NULL.  However, we cannot always expect the result.
+	 * For example, if we first remove the (only) existing link-local
+	 * address, and then reconfigure another one, the prefix is still
+	 * valid with referring to the old link-local address.
+	 */
+	if (nd6_prefix_lookup(&pr0) == NULL) {
+		if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
+			return (error);
+	}
+
+	return 0;
+}
+
+/*
+ * ifp - must be IFT_LOOP
+ */
+static int
+in6_ifattach_loopback(struct ifnet *ifp)
+{
+	struct in6_aliasreq ifra;
+	int error;
+
+	bzero(&ifra, sizeof(ifra));
+
+	/*
+	 * in6_update_ifa() does not use ifra_name, but we accurately set it
+	 * for safety.
+	 */
+	strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
+
+	ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
+	ifra.ifra_prefixmask.sin6_family = AF_INET6;
+	ifra.ifra_prefixmask.sin6_addr = in6mask128;
+
+	/*
+	 * Always initialize ia_dstaddr (= broadcast address) to loopback
+	 * address.  Follows IPv4 practice - see in_ifinit().
+	 */
+	ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
+	ifra.ifra_dstaddr.sin6_family = AF_INET6;
+	ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
+
+	ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
+	ifra.ifra_addr.sin6_family = AF_INET6;
+	ifra.ifra_addr.sin6_addr = in6addr_loopback;
+
+	/* the loopback  address should NEVER expire. */
+	ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
+	ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
+
+	/* we don't need to perform DAD on loopback interfaces. */
+	ifra.ifra_flags |= IN6_IFF_NODAD;
+
+	/* skip registration to the prefix list. XXX should be temporary. */
+	ifra.ifra_flags |= IN6_IFF_NOPFX;
+
+	/*
+	 * We are sure that this is a newly assigned address, so we can set
+	 * NULL to the 3rd arg.
+	 */
+	if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
+		nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
+		    "the loopback address on %s (errno=%d)\n",
+		    if_name(ifp), error));
+		return (-1);
+	}
+
+	return 0;
+}
+
+/*
+ * compute NI group address, based on the current hostname setting.
+ * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
+ *
+ * when ifp == NULL, the caller is responsible for filling scopeid.
+ */
+int
+in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
+    struct in6_addr *in6)
+{
+	struct prison *pr;
+	const char *p;
+	u_char *q;
+	MD5_CTX ctxt;
+	u_int8_t digest[16];
+	char l;
+	char n[64];	/* a single label must not exceed 63 chars */
+
+	/*
+	 * If no name is given and namelen is -1,
+	 * we try to do the hostname lookup ourselves.
+	 */
+	if (!name && namelen == -1) {
+		pr = curthread->td_ucred->cr_prison;
+		mtx_lock(&pr->pr_mtx);
+		name = pr->pr_hostname;
+		namelen = strlen(name);
+	} else
+		pr = NULL;
+	if (!name || !namelen) {
+		if (pr != NULL)
+			mtx_unlock(&pr->pr_mtx);
+		return -1;
+	}
+
+	p = name;
+	while (p && *p && *p != '.' && p - name < namelen)
+		p++;
+	if (p == name || p - name > sizeof(n) - 1) {
+		if (pr != NULL)
+			mtx_unlock(&pr->pr_mtx);
+		return -1;	/* label too long */
+	}
+	l = p - name;
+	strncpy(n, name, l);
+	if (pr != NULL)
+		mtx_unlock(&pr->pr_mtx);
+	n[(int)l] = '\0';
+	for (q = n; *q; q++) {
+		if ('A' <= *q && *q <= 'Z')
+			*q = *q - 'A' + 'a';
+	}
+
+	/* generate 8 bytes of pseudo-random value. */
+	bzero(&ctxt, sizeof(ctxt));
+	MD5Init(&ctxt);
+	MD5Update(&ctxt, &l, sizeof(l));
+	MD5Update(&ctxt, n, l);
+	MD5Final(digest, &ctxt);
+
+	bzero(in6, sizeof(*in6));
+	in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
+	in6->s6_addr8[11] = 2;
+	bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
+	if (in6_setscope(in6, ifp, NULL))
+		return (-1); /* XXX: should not fail */
+
+	return 0;
+}
+
+/*
+ * XXX multiple loopback interface needs more care.  for instance,
+ * nodelocal address needs to be configured onto only one of them.
+ * XXX multiple link-local address case
+ *
+ * altifp - secondary EUI64 source
+ */
+void
+in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
+{
+	struct in6_ifaddr *ia;
+	struct in6_addr in6;
+
+	/* some of the interfaces are inherently not IPv6 capable */
+	switch (ifp->if_type) {
+	case IFT_PFLOG:
+	case IFT_PFSYNC:
+	case IFT_CARP:
+		return;
+	}
+
+	/*
+	 * quirks based on interface type
+	 */
+	switch (ifp->if_type) {
+#ifdef IFT_STF
+	case IFT_STF:
+		/*
+		 * 6to4 interface is a very special kind of beast.
+		 * no multicast, no linklocal.  RFC2529 specifies how to make
+		 * linklocals for 6to4 interface, but there's no use and
+		 * it is rather harmful to have one.
+		 */
+		goto statinit;
+#endif
+	default:
+		break;
+	}
+
+	/*
+	 * usually, we require multicast capability to the interface
+	 */
+	if ((ifp->if_flags & IFF_MULTICAST) == 0) {
+		nd6log((LOG_INFO, "in6_ifattach: "
+		    "%s is not multicast capable, IPv6 not enabled\n",
+		    if_name(ifp)));
+		return;
+	}
+
+	/*
+	 * assign loopback address for loopback interface.
+	 * XXX multiple loopback interface case.
+	 */
+	if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
+		struct ifaddr *ifa;
+
+		in6 = in6addr_loopback;
+		ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6);
+		if (ifa == NULL) {
+			if (in6_ifattach_loopback(ifp) != 0)
+				return;
+		} else
+			ifa_free(ifa);
+	}
+
+	/*
+	 * assign a link-local address, if there's none.
+	 */
+	if (V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) {
+		ia = in6ifa_ifpforlinklocal(ifp, 0);
+		if (ia == NULL) {
+			if (in6_ifattach_linklocal(ifp, altifp) == 0) {
+				/* linklocal address assigned */
+			} else {
+				/* failed to assign linklocal address. bark? */
+			}
+		} else
+			ifa_free(&ia->ia_ifa);
+	}
+
+#ifdef IFT_STF			/* XXX */
+statinit:
+#endif
+
+	/* update dynamically. */
+	if (V_in6_maxmtu < ifp->if_mtu)
+		V_in6_maxmtu = ifp->if_mtu;
+}
+
+/*
+ * NOTE: in6_ifdetach() does not support loopback if at this moment.
+ * We don't need this function in bsdi, because interfaces are never removed
+ * from the ifnet list in bsdi.
+ */
+void
+in6_ifdetach(struct ifnet *ifp)
+{
+	struct in6_ifaddr *ia;
+	struct ifaddr *ifa, *next;
+	struct radix_node_head *rnh;
+	struct rtentry *rt;
+	short rtflags;
+	struct sockaddr_in6 sin6;
+	struct in6_multi_mship *imm;
+
+	/* remove neighbor management table */
+	nd6_purge(ifp);
+
+	/* nuke any of IPv6 addresses we have */
+	TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
+		if (ifa->ifa_addr->sa_family != AF_INET6)
+			continue;
+		in6_purgeaddr(ifa);
+	}
+
+	/* undo everything done by in6_ifattach(), just in case */
+	TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
+		if (ifa->ifa_addr->sa_family != AF_INET6
+		 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
+			continue;
+		}
+
+		ia = (struct in6_ifaddr *)ifa;
+
+		/*
+		 * 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 from the routing table */
+		if ((ia->ia_flags & IFA_ROUTE) &&
+		    (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) {
+			rtflags = rt->rt_flags;
+			RTFREE_LOCKED(rt);
+			rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
+			    (struct sockaddr *)&ia->ia_addr,
+			    (struct sockaddr *)&ia->ia_prefixmask,
+			    rtflags, (struct rtentry **)0);
+		}
+
+		/* remove from the linked list */
+		IF_ADDR_LOCK(ifp);
+		TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
+		IF_ADDR_UNLOCK(ifp);
+		ifa_free(ifa);				/* if_addrhead */
+
+		IN6_IFADDR_WLOCK();
+		TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
+		IN6_IFADDR_WUNLOCK();
+		ifa_free(ifa);
+	}
+
+	in6_pcbpurgeif0(&V_udbinfo, ifp);
+	in6_pcbpurgeif0(&V_ripcbinfo, ifp);
+	/* leave from all multicast groups joined */
+	in6_purgemaddrs(ifp);
+
+	/*
+	 * remove neighbor management table.  we call it twice just to make
+	 * sure we nuke everything.  maybe we need just one call.
+	 * XXX: since the first call did not release addresses, some prefixes
+	 * might remain.  We should call nd6_purge() again to release the
+	 * prefixes after removing all addresses above.
+	 * (Or can we just delay calling nd6_purge until at this point?)
+	 */
+	nd6_purge(ifp);
+
+	/* remove route to link-local allnodes multicast (ff02::1) */
+	bzero(&sin6, sizeof(sin6));
+	sin6.sin6_len = sizeof(struct sockaddr_in6);
+	sin6.sin6_family = AF_INET6;
+	sin6.sin6_addr = in6addr_linklocal_allnodes;
+	if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
+		/* XXX: should not fail */
+		return;
+	/* XXX grab lock first to avoid LOR */
+	rnh = rt_tables_get_rnh(0, AF_INET6);
+	if (rnh != NULL) {
+		RADIX_NODE_HEAD_LOCK(rnh);
+		rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED);
+		if (rt) {
+			if (rt->rt_ifp == ifp)
+				rtexpunge(rt);
+			RTFREE_LOCKED(rt);
+		}
+		RADIX_NODE_HEAD_UNLOCK(rnh);
+	}
+}
+
+int
+in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
+    const u_int8_t *baseid, int generate)
+{
+	u_int8_t nullbuf[8];
+	struct nd_ifinfo *ndi = ND_IFINFO(ifp);
+
+	bzero(nullbuf, sizeof(nullbuf));
+	if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
+		/* we've never created a random ID.  Create a new one. */
+		generate = 1;
+	}
+
+	if (generate) {
+		bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
+
+		/* generate_tmp_ifid will update seedn and buf */
+		(void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
+		    ndi->randomid);
+	}
+	bcopy(ndi->randomid, retbuf, 8);
+
+	return (0);
+}
+
+void
+in6_tmpaddrtimer(void *arg)
+{
+	CURVNET_SET((struct vnet *) arg);
+	struct nd_ifinfo *ndi;
+	u_int8_t nullbuf[8];
+	struct ifnet *ifp;
+
+	callout_reset(&V_in6_tmpaddrtimer_ch,
+	    (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
+	    V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet);
+
+	bzero(nullbuf, sizeof(nullbuf));
+	for (ifp = TAILQ_FIRST(&V_ifnet); ifp;
+	    ifp = TAILQ_NEXT(ifp, if_list)) {
+		ndi = ND_IFINFO(ifp);
+		if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
+			/*
+			 * We've been generating a random ID on this interface.
+			 * Create a new one.
+			 */
+			(void)generate_tmp_ifid(ndi->randomseed0,
+			    ndi->randomseed1, ndi->randomid);
+		}
+	}
+
+	CURVNET_RESTORE();
+}
+
+static void
+in6_purgemaddrs(struct ifnet *ifp)
+{
+	LIST_HEAD(,in6_multi)	 purgeinms;
+	struct in6_multi	*inm, *tinm;
+	struct ifmultiaddr	*ifma;
+
+	LIST_INIT(&purgeinms);
+	IN6_MULTI_LOCK();
+
+	/*
+	 * Extract list of in6_multi associated with the detaching ifp
+	 * which the PF_INET6 layer is about to release.
+	 * We need to do this as IF_ADDR_LOCK() may be re-acquired
+	 * by code further down.
+	 */
+	IF_ADDR_LOCK(ifp);
+	TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
+		if (ifma->ifma_addr->sa_family != AF_INET6 ||
+		    ifma->ifma_protospec == NULL)
+			continue;
+		inm = (struct in6_multi *)ifma->ifma_protospec;
+		LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry);
+	}
+	IF_ADDR_UNLOCK(ifp);
+
+	LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) {
+		LIST_REMOVE(inm, in6m_entry);
+		in6m_release_locked(inm);
+	}
+	mld_ifdetach(ifp);
+
+	IN6_MULTI_UNLOCK();
+}