6 files changed, 1435 insertions, 0 deletions

diff --git a/net/stf-6rd-kmod/Makefile b/net/stf-6rd-kmod/Makefile
new file mode 100644
index 000000000000..e658e0736033
--- /dev/null
+++ b/net/stf-6rd-kmod/Makefile
@@ -0,0 +1,73 @@
+# New ports collection makefile for:	stf-6rd-kmod
+# Date created:		2 Mar 2012
+# Whom:			Jun Kuriyama <kuriyama@FreeBSD.org>
+#
+# $FreeBSD$
+#
+
+PORTNAME=	stf
+PORTVERSION=	0.${SVN_REV}
+CATEGORIES=	net ipv6
+MASTER_SITES=	${MASTER_SITE_LOCAL}
+MASTER_SITE_SUBDIR=	kuriyama
+PKGNAMESUFFIX=	-6rd-kmod
+DISTNAME=	freebsd-stf-${OSREL}-${PORTVERSION}
+
+MAINTAINER=	kuriyama@FreeBSD.org
+COMMENT=	6rd patched stf(4) kernel modules port for 8.1+
+
+ONLY_FOR_ARCHS=	amd64 i386
+
+WRKSRC=		${WRKDIR}
+SVN_REV=	232314	# 8.1=r209773, 8.2=r216741, 8.3=r232314
+KMODDIR?=	/boot/modules
+PLIST_SUB=	KMODDIR=${KMODDIR:C,^/,,}
+
+.if !exists(${SRC_BASE}/sys/Makefile)
+IGNORE=		requires kernel source to be installed
+.endif
+
+.include <bsd.port.pre.mk>
+
+.if ${OSREL} != "8.1" && ${OSREL} != "8.2" && ${OSREL} != "8.3"
+IGNORE=		not supported $${OSREL} (${OSREL})
+.endif
+
+post-extract:
+	cd ${WRKSRC} && ${MKDIR} tmp && ${MV} net modules tmp/
+	${CP} -Rp ${SRC_BASE}/sys ${WRKSRC}/
+	${MKDIR} ${WRKSRC}/share/man
+	${CP} -Rp ${SRC_BASE}/share/man/man4 ${WRKSRC}/share/man/
+	${CP} -Rp ${WRKSRC}/tmp/* ${WRKSRC}/sys/
+
+pre-patch:
+	${REINPLACE_CMD} -e 's|\.Dd July 23, 2011|.Dd April 27, 2001|' ${WRKSRC}/share/man/man4/stf.4
+
+do-build:
+	cd ${WRKSRC}/sys/modules/if_stf; ${MAKE} DEBUG_FLAGS=-g
+
+do-install:
+.for f in if_stf
+	${INSTALL_KLD} ${WRKSRC}/sys/modules/if_stf/${f}.ko ${KMODDIR}
+	${INSTALL_KLD} ${WRKSRC}/sys/modules/if_stf/${f}.ko.symbols ${KMODDIR}
+.endfor
+	/usr/sbin/kldxref ${KMODDIR}
+
+post-install:
+	${CAT} ${PKGMESSAGE}
+
+# For maintainer only.
+SVN_MIRROR?=	http://svn.freebsd.org/base
+EXPDIR=		${WRKSRC}/src/sys
+maintainer-tar:
+	${MKDIR} ${EXPDIR}
+	cd ${EXPDIR} && svn export -r ${SVN_REV} ${SVN_MIRROR}/releng/${OSREL}/sys/net net
+	cd ${EXPDIR} && svn export -r ${SVN_REV} ${SVN_MIRROR}/releng/${OSREL}/sys/modules/if_stf modules/if_stf
+	cd ${EXPDIR} && ${TAR} cfvz ${DISTDIR}/${DISTFILES} net modules
+
+maintainer-check:
+	@new=`svn log -ql 1 ${SVN_MIRROR}@HEAD releng/${OSREL}/sys/net/if_stf.c | ${GREP} -v ^- | ${SED} -e 's| .*||'`;\
+	old="r${SVN_REV}";\
+	if [ "$${new}" != "$${old}" ]; then ${ECHO_MSG} "New stf rev: $${new}"; fi
+
+.include <bsd.port.post.mk>
diff --git a/net/stf-6rd-kmod/distinfo b/net/stf-6rd-kmod/distinfo
new file mode 100644
index 000000000000..0f7c6985f42a
--- /dev/null
+++ b/net/stf-6rd-kmod/distinfo
@@ -0,0 +1,6 @@
+SHA256 (freebsd-stf-8.1-0.232314.tar.gz) = bb91e0f43f6f15fe8f41b8c1d0b52c5e46b9c348b1b5e736fee5bf690c4dc2a0
+SIZE (freebsd-stf-8.1-0.232314.tar.gz) = 488169
+SHA256 (freebsd-stf-8.2-0.232314.tar.gz) = 9090dc3094ac4bc5f6d8476809e07f6298abc282cde44f754ec260e828667b8f
+SIZE (freebsd-stf-8.2-0.232314.tar.gz) = 485749
+SHA256 (freebsd-stf-8.3-0.232314.tar.gz) = c87f674d1847834285a4cb7728c75c9000e1330b0734c2fcf5fe80db88ada000
+SIZE (freebsd-stf-8.3-0.232314.tar.gz) = 498829
diff --git a/net/stf-6rd-kmod/files/patch-stf_6rd_20100923-1.diff b/net/stf-6rd-kmod/files/patch-stf_6rd_20100923-1.diff
new file mode 100644
index 000000000000..5cf1bf067971
--- /dev/null
+++ b/net/stf-6rd-kmod/files/patch-stf_6rd_20100923-1.diff
@@ -0,0 +1,1332 @@
+Index: sys/net/if_stf.c
+===================================================================
+--- sys/net/if_stf.c	(revision 212820)
++++ sys/net/if_stf.c	(working copy)
+@@ -3,6 +3,7 @@
+ 
+ /*-
+  * Copyright (C) 2000 WIDE Project.
++ * Copyright (c) 2010 Hiroki Sato <hrs@FreeBSD.org>
+  * All rights reserved.
+  *
+  * Redistribution and use in source and binary forms, with or without
+@@ -31,7 +32,7 @@
+  */
+ 
+ /*
+- * 6to4 interface, based on RFC3056.
++ * 6to4 interface, based on RFC3056 + 6rd (RFC5569) support.
+  *
+  * 6to4 interface is NOT capable of link-layer (I mean, IPv4) multicasting.
+  * There is no address mapping defined from IPv6 multicast address to IPv4
+@@ -60,7 +61,7 @@
+  * ICMPv6:
+  * - Redirects cannot be used due to the lack of link-local address.
+  *
+- * stf interface does not have, and will not need, a link-local address.  
++ * stf interface does not have, and will not need, a link-local address.
+  * It seems to have no real benefit and does not help the above symptoms much.
+  * Even if we assign link-locals to interface, we cannot really
+  * use link-local unicast/multicast on top of 6to4 cloud (since there's no
+@@ -72,6 +73,12 @@
+  * http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt
+  * for details.  The code tries to filter out some of malicious packets.
+  * Note that there is no way to be 100% secure.
++ *
++ * 6rd (RFC5569) extension is enabled when an IPv6 GUA other than
++ * 2002::/16 is assigned.  The stf(4) recognizes a 32-bit just after
++ * prefixlen as the IPv4 address of the 6rd customer site.  The
++ * prefixlen must be shorter than 32.
++ *
+  */
+ 
+ #include "opt_inet.h"
+@@ -120,15 +127,41 @@
+ 
+ #include <security/mac/mac_framework.h>
+ 
++#define	STF_DEBUG 1
++#define ip_sprintf(buf, a)						\
++	sprintf(buf, "%d.%d.%d.%d",					\
++		(ntohl((a)->s_addr)>>24)&0xFF,				\
++		(ntohl((a)->s_addr)>>16)&0xFF,				\
++		(ntohl((a)->s_addr)>>8)&0xFF,				\
++		(ntohl((a)->s_addr))&0xFF);
++#if STF_DEBUG
++#define DEBUG_PRINTF(a, ...)						\
++	do {								\
++		if (V_stf_debug >= a)					\
++			printf(__VA_ARGS__);				\
++	} while (0)
++#else
++#define DEBUG_PRINTF(a, ...)
++#endif
++
+ SYSCTL_DECL(_net_link);
+ SYSCTL_NODE(_net_link, IFT_STF, stf, CTLFLAG_RW, 0, "6to4 Interface");
+ 
+-static int stf_route_cache = 1;
+-SYSCTL_INT(_net_link_stf, OID_AUTO, route_cache, CTLFLAG_RW,
+-    &stf_route_cache, 0, "Caching of IPv4 routes for 6to4 Output");
++static VNET_DEFINE(int, stf_route_cache) = 1;
++#define V_stf_route_cache	VNET(stf_route_cache)
++SYSCTL_VNET_INT(_net_link_stf, OID_AUTO, route_cache, CTLFLAG_RW,
++    &VNET_NAME(stf_route_cache), 0,
++    "Enable caching of IPv4 routes for 6to4 output.");
+ 
++#if STF_DEBUG
++static VNET_DEFINE(int, stf_debug) = 0;
++#define V_stf_debug	VNET(stf_debug)
++SYSCTL_VNET_INT(_net_link_stf, OID_AUTO, stf_debug, CTLFLAG_RW,
++    &VNET_NAME(stf_debug), 0,
++    "Enable displaying verbose debug message of stf interfaces");
++#endif
++
+ #define STFNAME		"stf"
+-#define STFUNIT		0
+ 
+ #define IN6_IS_ADDR_6TO4(x)	(ntohs((x)->s6_addr16[0]) == 0x2002)
+ 
+@@ -145,17 +178,26 @@
+ 		struct route_in6 __sc_ro6; /* just for safety */
+ 	} __sc_ro46;
+ #define sc_ro	__sc_ro46.__sc_ro4
+-	struct mtx	sc_ro_mtx;
++	struct mtx	sc_mtx;
+ 	u_int	sc_fibnum;
+ 	const struct encaptab *encap_cookie;
++	u_int	sc_flags;
++	LIST_ENTRY(stf_softc) stf_list;
+ };
+ #define STF2IFP(sc)	((sc)->sc_ifp)
+ 
+-/*
+- * Note that mutable fields in the softc are not currently locked.
+- * We do lock sc_ro in stf_output though.
+- */
++static struct mtx stf_mtx;
+ static MALLOC_DEFINE(M_STF, STFNAME, "6to4 Tunnel Interface");
++static VNET_DEFINE(LIST_HEAD(, stf_softc), stf_softc_list);
++#define V_stf_softc_list	VNET(stf_softc_list)
++
++#define STF_LOCK_INIT(sc)	mtx_init(&(sc)->sc_mtx, "stf softc",	\
++				    NULL, MTX_DEF);
++#define STF_LOCK_DESTROY(sc)	mtx_destroy(&(sc)->sc_mtx)
++#define STF_LOCK(sc)		mtx_lock(&(sc)->sc_mtx)
++#define STF_UNLOCK(sc)		mtx_unlock(&(sc)->sc_mtx)
++#define STF_LOCK_ASSERT(sc)	mtx_assert(&(sc)->sc_mtx, MA_OWNED)
++
+ static const int ip_stf_ttl = 40;
+ 
+ extern  struct domain inetdomain;
+@@ -170,8 +212,6 @@
+ 	.pr_usrreqs =		&rip_usrreqs
+ };
+ 
+-static char *stfnames[] = {"stf0", "stf", "6to4", NULL};
+-
+ static int stfmodevent(module_t, int, void *);
+ static int stf_encapcheck(const struct mbuf *, int, int, void *);
+ static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *);
+@@ -184,68 +224,45 @@
+ 	struct ifnet *);
+ static void stf_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
+ static int stf_ioctl(struct ifnet *, u_long, caddr_t);
++static int stf_is_up(struct ifnet *);
+ 
+-static int stf_clone_match(struct if_clone *, const char *);
+-static int stf_clone_create(struct if_clone *, char *, size_t, caddr_t);
+-static int stf_clone_destroy(struct if_clone *, struct ifnet *);
+-struct if_clone stf_cloner = IFC_CLONE_INITIALIZER(STFNAME, NULL, 0,
+-    NULL, stf_clone_match, stf_clone_create, stf_clone_destroy);
++#define STF_GETIN4_USE_CACHE	1
++static struct sockaddr_in *stf_getin4addr(struct sockaddr_in *,
++					  struct ifaddr *,
++					  int);
++static struct sockaddr_in *stf_getin4addr_in6(struct sockaddr_in *,
++					      struct ifaddr *,
++					      struct in6_addr *);
++static struct sockaddr_in *stf_getin4addr_sin6(struct sockaddr_in *,
++					       struct ifaddr *,
++					       struct sockaddr_in6 *);
++static int stf_clone_create(struct if_clone *, int, caddr_t);
++static void stf_clone_destroy(struct ifnet *);
+ 
+-static int
+-stf_clone_match(struct if_clone *ifc, const char *name)
+-{
+-	int i;
++IFC_SIMPLE_DECLARE(stf, 0);
+ 
+-	for(i = 0; stfnames[i] != NULL; i++) {
+-		if (strcmp(stfnames[i], name) == 0)
+-			return (1);
+-	}
+-
+-	return (0);
+-}
+-
+ static int
+-stf_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
++stf_clone_create(struct if_clone *ifc, int unit, caddr_t params)
+ {
+-	int err, unit;
+ 	struct stf_softc *sc;
+ 	struct ifnet *ifp;
+ 
+-	/*
+-	 * We can only have one unit, but since unit allocation is
+-	 * already locked, we use it to keep from allocating extra
+-	 * interfaces.
+-	 */
+-	unit = STFUNIT;
+-	err = ifc_alloc_unit(ifc, &unit);
+-	if (err != 0)
+-		return (err);
+-
+ 	sc = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK | M_ZERO);
++	sc->sc_fibnum = curthread->td_proc->p_fibnum;
+ 	ifp = STF2IFP(sc) = if_alloc(IFT_STF);
+-	if (ifp == NULL) {
++	if (sc->sc_ifp == NULL) {
+ 		free(sc, M_STF);
+-		ifc_free_unit(ifc, unit);
+-		return (ENOSPC);
++		return (ENOMEM);
+ 	}
++	STF_LOCK_INIT(sc);
+ 	ifp->if_softc = sc;
+-	sc->sc_fibnum = curthread->td_proc->p_fibnum;
++	if_initname(ifp, ifc->ifc_name, unit);
+ 
+-	/*
+-	 * Set the name manually rather then using if_initname because
+-	 * we don't conform to the default naming convention for interfaces.
+-	 */
+-	strlcpy(ifp->if_xname, name, IFNAMSIZ);
+-	ifp->if_dname = ifc->ifc_name;
+-	ifp->if_dunit = IF_DUNIT_NONE;
+-
+-	mtx_init(&(sc)->sc_ro_mtx, "stf ro", NULL, MTX_DEF);
+ 	sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6,
+ 	    stf_encapcheck, &in_stf_protosw, sc);
+ 	if (sc->encap_cookie == NULL) {
+ 		if_printf(ifp, "attach failed\n");
+ 		free(sc, M_STF);
+-		ifc_free_unit(ifc, unit);
+ 		return (ENOMEM);
+ 	}
+ 
+@@ -255,41 +272,57 @@
+ 	ifp->if_snd.ifq_maxlen = ifqmaxlen;
+ 	if_attach(ifp);
+ 	bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
++
++	mtx_lock(&stf_mtx);
++	LIST_INSERT_HEAD(&V_stf_softc_list, sc, stf_list);
++	mtx_unlock(&stf_mtx);
++
+ 	return (0);
+ }
+ 
+-static int
+-stf_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
++static void
++stf_clone_destroy(struct ifnet *ifp)
+ {
+ 	struct stf_softc *sc = ifp->if_softc;
+ 	int err;
+ 
++	mtx_lock(&stf_mtx);
++	LIST_REMOVE(sc, stf_list);
++	mtx_unlock(&stf_mtx);
++
+ 	err = encap_detach(sc->encap_cookie);
+ 	KASSERT(err == 0, ("Unexpected error detaching encap_cookie"));
+-	mtx_destroy(&(sc)->sc_ro_mtx);
+ 	bpfdetach(ifp);
+ 	if_detach(ifp);
+ 	if_free(ifp);
+ 
++	STF_LOCK_DESTROY(sc);
+ 	free(sc, M_STF);
+-	ifc_free_unit(ifc, STFUNIT);
+ 
+-	return (0);
++	return;
+ }
+ 
++static void
++vnet_stf_init(const void *unused __unused)
++{
++
++	LIST_INIT(&V_stf_softc_list);
++}
++VNET_SYSINIT(vnet_stf_init, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, vnet_stf_init,
++    NULL);
++
+ static int
+-stfmodevent(mod, type, data)
+-	module_t mod;
+-	int type;
+-	void *data;
++stfmodevent(module_t mod, int type, void *data)
+ {
+ 
+ 	switch (type) {
+ 	case MOD_LOAD:
++		mtx_init(&stf_mtx, "stf_mtx", NULL, MTX_DEF);
+ 		if_clone_attach(&stf_cloner);
+ 		break;
+ 	case MOD_UNLOAD:
+ 		if_clone_detach(&stf_cloner);
++		mtx_destroy(&stf_mtx);
+ 		break;
+ 	default:
+ 		return (EOPNOTSUPP);
+@@ -305,28 +338,31 @@
+ };
+ 
+ DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
++MODULE_VERSION(if_stf, 1);
+ 
+ static int
+-stf_encapcheck(m, off, proto, arg)
+-	const struct mbuf *m;
+-	int off;
+-	int proto;
+-	void *arg;
++stf_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
+ {
+ 	struct ip ip;
+ 	struct in6_ifaddr *ia6;
++	struct sockaddr_in ia6_in4addr;
++	struct sockaddr_in ia6_in4mask;
++	struct sockaddr_in *sin;
+ 	struct stf_softc *sc;
+-	struct in_addr a, b, mask;
++	struct ifnet *ifp;
++	int ret = 0;
+ 
++	DEBUG_PRINTF(1, "%s: enter\n", __func__);
+ 	sc = (struct stf_softc *)arg;
+ 	if (sc == NULL)
+ 		return 0;
++	ifp = STF2IFP(sc);
+ 
+-	if ((STF2IFP(sc)->if_flags & IFF_UP) == 0)
++	if ((ifp->if_flags & IFF_UP) == 0)
+ 		return 0;
+ 
+ 	/* IFF_LINK0 means "no decapsulation" */
+-	if ((STF2IFP(sc)->if_flags & IFF_LINK0) != 0)
++	if ((ifp->if_flags & IFF_LINK0) != 0)
+ 		return 0;
+ 
+ 	if (proto != IPPROTO_IPV6)
+@@ -338,86 +374,162 @@
+ 	if (ip.ip_v != 4)
+ 		return 0;
+ 
+-	ia6 = stf_getsrcifa6(STF2IFP(sc));
++	/* Lookup an ia6 whose IPv4 addr encoded in the IPv6 addr is valid. */
++	ia6 = stf_getsrcifa6(ifp);
+ 	if (ia6 == NULL)
+ 		return 0;
++	sin = stf_getin4addr(&ia6_in4addr, &ia6->ia_ifa, STF_GETIN4_USE_CACHE);
++	if (sin == NULL)
++		return 0;
+ 
++#if STF_DEBUG
++	{
++		char buf[INET6_ADDRSTRLEN + 1];
++		memset(&buf, 0, sizeof(buf));
++
++		ip6_sprintf(buf, &satosin6(ia6->ia_ifa.ifa_addr)->sin6_addr);
++		DEBUG_PRINTF(1, "%s: ia6->ia_ifa.ifa_addr = %s\n", __func__, buf);
++		ip6_sprintf(buf, &ia6->ia_addr.sin6_addr);
++		DEBUG_PRINTF(1, "%s: ia6->ia_addr = %s\n", __func__, buf);
++		ip6_sprintf(buf, &satosin6(ia6->ia_ifa.ifa_netmask)->sin6_addr);
++		DEBUG_PRINTF(1, "%s: ia6->ia_ifa.ifa_netmask = %s\n", __func__, buf);
++		ip6_sprintf(buf, &ia6->ia_prefixmask.sin6_addr);
++		DEBUG_PRINTF(1, "%s: ia6->ia_prefixmask = %s\n", __func__, buf);
++
++		ip_sprintf(buf, &ia6_in4addr.sin_addr);
++		DEBUG_PRINTF(1, "%s: ia6_in4addr.sin_addr = %s\n", __func__, buf);
++		ip_sprintf(buf, &ip.ip_src);
++		DEBUG_PRINTF(1, "%s: ip.ip_src = %s\n", __func__, buf);
++		ip_sprintf(buf, &ip.ip_dst);
++		DEBUG_PRINTF(1, "%s: ip.ip_dst = %s\n", __func__, buf);
++	}
++#endif
+ 	/*
+ 	 * check if IPv4 dst matches the IPv4 address derived from the
+ 	 * local 6to4 address.
+ 	 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:...
+ 	 */
+-	if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst,
+-	    sizeof(ip.ip_dst)) != 0) {
+-		ifa_free(&ia6->ia_ifa);
+-		return 0;
++	DEBUG_PRINTF(1, "%s: check1: ia6_in4addr.sin_addr == ip.ip_dst?\n", __func__);
++	if (ia6_in4addr.sin_addr.s_addr != ip.ip_dst.s_addr) {
++		DEBUG_PRINTF(1, "%s: check1: false.  Ignore this packet.\n", __func__);
++		goto freeit;
+ 	}
+ 
+-	/*
+-	 * check if IPv4 src matches the IPv4 address derived from the
+-	 * local 6to4 address masked by prefixmask.
+-	 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
+-	 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
+-	 */
+-	bzero(&a, sizeof(a));
+-	bcopy(GET_V4(&ia6->ia_addr.sin6_addr), &a, sizeof(a));
+-	bcopy(GET_V4(&ia6->ia_prefixmask.sin6_addr), &mask, sizeof(mask));
++	DEBUG_PRINTF(1, "%s: check2: ia6->ia_addr is 2002::/16?\n", __func__);
++	if (IN6_IS_ADDR_6TO4(&ia6->ia_addr.sin6_addr)) {
++		/* 6to4 (RFC 3056) */
++		/*
++		 * check if IPv4 src matches the IPv4 address derived
++		 * from the local 6to4 address masked by prefixmask.
++		 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
++		 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
++		 */
++		DEBUG_PRINTF(1, "%s: check2: true.\n", __func__);
++
++		memcpy(&ia6_in4mask.sin_addr,
++		       GET_V4(&ia6->ia_prefixmask.sin6_addr),
++		       sizeof(ia6_in4mask));
++#if STF_DEBUG
++		{
++			char buf[INET6_ADDRSTRLEN + 1];
++			memset(&buf, 0, sizeof(buf));
++
++			ip_sprintf(buf, &ia6_in4addr.sin_addr);
++			DEBUG_PRINTF(1, "%s: ia6->ia_addr = %s\n",
++				     __func__, buf);
++			ip_sprintf(buf, &ip.ip_src);
++			DEBUG_PRINTF(1, "%s: ip.ip_src = %s\n",
++				     __func__, buf);
++			ip_sprintf(buf, &ia6_in4mask.sin_addr);
++			DEBUG_PRINTF(1, "%s: ia6->ia_prefixmask = %s\n",
++				     __func__, buf);
++
++			DEBUG_PRINTF(1, "%s: check3: ia6_in4addr.sin_addr & mask == ip.ip_src & mask\n",
++				     __func__);
++		}
++#endif
++
++		if ((ia6_in4addr.sin_addr.s_addr & ia6_in4mask.sin_addr.s_addr) !=
++		    (ip.ip_src.s_addr & ia6_in4mask.sin_addr.s_addr)) {
++			DEBUG_PRINTF(1, "%s: check3: false.  Ignore this packet.\n",
++				     __func__);
++			goto freeit;
++		}
++	} else {
++		/* 6rd (RFC 5569) */
++		DEBUG_PRINTF(1, "%s: check2: false.  6rd.\n", __func__);
++		/*
++		 * No restriction on the src address in the case of
++		 * 6rd because the stf(4) interface always has a
++		 * prefix which covers whole of IPv4 src address
++		 * range.  So, stf_output() will catch all of
++		 * 6rd-capsuled IPv4 traffic with suspicious inner dst
++		 * IPv4 address (i.e. the IPv6 destination address is
++		 * one the admin does not like to route to outside),
++		 * and then it discard them silently.
++		 */
++	}
++	DEBUG_PRINTF(1, "%s: all clear!\n", __func__);
++	/* stf interface makes single side match only */
++	ret = 32;
++freeit:
+ 	ifa_free(&ia6->ia_ifa);
+-	a.s_addr &= mask.s_addr;
+-	b = ip.ip_src;
+-	b.s_addr &= mask.s_addr;
+-	if (a.s_addr != b.s_addr)
+-		return 0;
+ 
+-	/* stf interface makes single side match only */
+-	return 32;
++	return (ret);
+ }
+ 
+ static struct in6_ifaddr *
+-stf_getsrcifa6(ifp)
+-	struct ifnet *ifp;
++stf_getsrcifa6(struct ifnet *ifp)
+ {
+-	struct ifaddr *ia;
++	struct ifaddr *ifa;
+ 	struct in_ifaddr *ia4;
+-	struct sockaddr_in6 *sin6;
+-	struct in_addr in;
++	struct sockaddr_in *sin;
++	struct sockaddr_in in4;
+ 
+ 	if_addr_rlock(ifp);
+-	TAILQ_FOREACH(ia, &ifp->if_addrhead, ifa_link) {
+-		if (ia->ifa_addr->sa_family != AF_INET6)
++	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
++		if (ifa->ifa_addr->sa_family != AF_INET6)
+ 			continue;
+-		sin6 = (struct sockaddr_in6 *)ia->ifa_addr;
+-		if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr))
++		if ((sin = stf_getin4addr(&in4, ifa,
++					  STF_GETIN4_USE_CACHE)) == NULL)
+ 			continue;
+-
+-		bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in));
+-		LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash)
+-			if (ia4->ia_addr.sin_addr.s_addr == in.s_addr)
++		LIST_FOREACH(ia4, INADDR_HASH(sin->sin_addr.s_addr), ia_hash)
++			if (ia4->ia_addr.sin_addr.s_addr == sin->sin_addr.s_addr)
+ 				break;
+ 		if (ia4 == NULL)
+ 			continue;
+ 
+-		ifa_ref(ia);
++#if STF_DEBUG
++		{
++			char buf[INET6_ADDRSTRLEN + 1];
++			memset(&buf, 0, sizeof(buf));
++
++			ip6_sprintf(buf, &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr);
++			DEBUG_PRINTF(1, "%s: ifa->ifa_addr->sin6_addr = %s\n",
++				     __func__, buf);
++			ip_sprintf(buf, &ia4->ia_addr.sin_addr);
++			DEBUG_PRINTF(1, "%s: ia4->ia_addr.sin_addr = %s\n",
++				     __func__, buf);
++		}
++#endif
++		ifa_ref(ifa);
+ 		if_addr_runlock(ifp);
+-		return (struct in6_ifaddr *)ia;
++		return (ifatoia6(ifa));
+ 	}
+ 	if_addr_runlock(ifp);
+ 
++
+ 	return NULL;
+ }
+ 
+ static int
+-stf_output(ifp, m, dst, ro)
+-	struct ifnet *ifp;
+-	struct mbuf *m;
+-	struct sockaddr *dst;
+-	struct route *ro;
++stf_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, struct route *ro)
+ {
+ 	struct stf_softc *sc;
+ 	struct sockaddr_in6 *dst6;
+ 	struct route *cached_route;
+-	struct in_addr in4;
+-	caddr_t ptr;
++	struct sockaddr_in *sin;
++	struct sockaddr_in in4;
+ 	struct sockaddr_in *dst4;
+ 	u_int8_t tos;
+ 	struct ip *ip;
+@@ -479,20 +591,28 @@
+ 	/*
+ 	 * Pickup the right outer dst addr from the list of candidates.
+ 	 * ip6_dst has priority as it may be able to give us shorter IPv4 hops.
++	 *   ip6_dst: destination addr in the packet header.
++	 *   dst6: destination addr specified in function argument.
+ 	 */
+-	ptr = NULL;
+-	if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst))
+-		ptr = GET_V4(&ip6->ip6_dst);
+-	else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr))
+-		ptr = GET_V4(&dst6->sin6_addr);
+-	else {
++	DEBUG_PRINTF(1, "%s: dst addr selection\n", __func__);
++	sin = stf_getin4addr_in6(&in4, &ia6->ia_ifa, &ip6->ip6_dst);
++	if (sin == NULL)
++		sin = stf_getin4addr_in6(&in4, &ia6->ia_ifa, &dst6->sin6_addr);
++	if (sin == NULL) {
+ 		ifa_free(&ia6->ia_ifa);
+ 		m_freem(m);
+ 		ifp->if_oerrors++;
+ 		return ENETUNREACH;
+ 	}
+-	bcopy(ptr, &in4, sizeof(in4));
++#if STF_DEBUG
++	{
++		char buf[INET6_ADDRSTRLEN + 1];
++		memset(&buf, 0, sizeof(buf));
+ 
++		ip_sprintf(buf, &sin->sin_addr);
++		DEBUG_PRINTF(1, "%s: ip_dst = %s\n", __func__, buf);
++	}
++#endif
+ 	if (bpf_peers_present(ifp->if_bpf)) {
+ 		/*
+ 		 * We need to prepend the address family as
+@@ -516,11 +636,26 @@
+ 	ip = mtod(m, struct ip *);
+ 
+ 	bzero(ip, sizeof(*ip));
++	bcopy(&in4.sin_addr, &ip->ip_dst, sizeof(ip->ip_dst));
+ 
+-	bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr),
+-	    &ip->ip_src, sizeof(ip->ip_src));
++	sin = stf_getin4addr_sin6(&in4, &ia6->ia_ifa, &ia6->ia_addr);
++	if (sin == NULL) {
++		ifa_free(&ia6->ia_ifa);
++		m_freem(m);
++		ifp->if_oerrors++;
++		return ENETUNREACH;
++	}
++	bcopy(&in4.sin_addr, &ip->ip_src, sizeof(ip->ip_src));
++#if STF_DEBUG
++	{
++		char buf[INET6_ADDRSTRLEN + 1];
++		memset(&buf, 0, sizeof(buf));
++
++		ip_sprintf(buf, &ip->ip_src);
++		DEBUG_PRINTF(1, "%s: ip_src = %s\n", __func__, buf);
++	}
++#endif
+ 	ifa_free(&ia6->ia_ifa);
+-	bcopy(&in4, &ip->ip_dst, sizeof(ip->ip_dst));
+ 	ip->ip_p = IPPROTO_IPV6;
+ 	ip->ip_ttl = ip_stf_ttl;
+ 	ip->ip_len = m->m_pkthdr.len;	/*host order*/
+@@ -529,7 +664,7 @@
+ 	else
+ 		ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos);
+ 
+-	if (!stf_route_cache) {
++	if (!V_stf_route_cache) {
+ 		cached_route = NULL;
+ 		goto sendit;
+ 	}
+@@ -537,7 +672,7 @@
+ 	/*
+ 	 * Do we have a cached route?
+ 	 */
+-	mtx_lock(&(sc)->sc_ro_mtx);
++	STF_LOCK(sc);
+ 	dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst;
+ 	if (dst4->sin_family != AF_INET ||
+ 	    bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) {
+@@ -555,44 +690,48 @@
+ 		rtalloc_fib(&sc->sc_ro, sc->sc_fibnum);
+ 		if (sc->sc_ro.ro_rt == NULL) {
+ 			m_freem(m);
+-			mtx_unlock(&(sc)->sc_ro_mtx);
+ 			ifp->if_oerrors++;
++			STF_UNLOCK(sc);
+ 			return ENETUNREACH;
+ 		}
++		if (sc->sc_ro.ro_rt->rt_ifp == ifp) {
++			/* infinite loop detection */
++			m_free(m);
++			ifp->if_oerrors++;
++			STF_UNLOCK(sc);
++			return ENETUNREACH;
++		}
+ 	}
+ 	cached_route = &sc->sc_ro;
+ 
+ sendit:
+ 	M_SETFIB(m, sc->sc_fibnum);
+ 	ifp->if_opackets++;
++	DEBUG_PRINTF(1, "%s: ip_output dispatch.\n", __func__);
+ 	error = ip_output(m, NULL, cached_route, 0, NULL, NULL);
+ 
+ 	if (cached_route != NULL)
+-		mtx_unlock(&(sc)->sc_ro_mtx);
++		STF_UNLOCK(sc);
+ 	return error;
+ }
+ 
+ static int
+-isrfc1918addr(in)
+-	struct in_addr *in;
++isrfc1918addr(struct in_addr *in)
+ {
+ 	/*
+ 	 * returns 1 if private address range:
+ 	 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16
+ 	 */
+-	if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 ||
+-	    (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 ||
+-	    (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168)
++	if ((ntohl(in->s_addr) & 0xff000000) == 10 << 24 ||
++	    (ntohl(in->s_addr) & 0xfff00000) == (172 * 256 + 16) << 16 ||
++	    (ntohl(in->s_addr) & 0xffff0000) == (192 * 256 + 168) << 16 )
+ 		return 1;
+ 
+ 	return 0;
+ }
+ 
+ static int
+-stf_checkaddr4(sc, in, inifp)
+-	struct stf_softc *sc;
+-	struct in_addr *in;
+-	struct ifnet *inifp;	/* incoming interface */
++stf_checkaddr4(struct stf_softc *sc, struct in_addr *in, struct ifnet *inifp)
+ {
+ 	struct in_ifaddr *ia4;
+ 
+@@ -608,20 +747,10 @@
+ 	}
+ 
+ 	/*
+-	 * reject packets with private address range.
+-	 * (requirement from RFC3056 section 2 1st paragraph)
+-	 */
+-	if (isrfc1918addr(in))
+-		return -1;
+-
+-	/*
+ 	 * reject packets with broadcast
+ 	 */
+ 	IN_IFADDR_RLOCK();
+-	for (ia4 = TAILQ_FIRST(&V_in_ifaddrhead);
+-	     ia4;
+-	     ia4 = TAILQ_NEXT(ia4, ia_link))
+-	{
++	TAILQ_FOREACH(ia4, &V_in_ifaddrhead, ia_link) {
+ 		if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
+ 			continue;
+ 		if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
+@@ -640,7 +769,7 @@
+ 
+ 		bzero(&sin, sizeof(sin));
+ 		sin.sin_family = AF_INET;
+-		sin.sin_len = sizeof(struct sockaddr_in);
++		sin.sin_len = sizeof(sin);
+ 		sin.sin_addr = *in;
+ 		rt = rtalloc1_fib((struct sockaddr *)&sin, 0,
+ 		    0UL, sc->sc_fibnum);
+@@ -661,10 +790,7 @@
+ }
+ 
+ static int
+-stf_checkaddr6(sc, in6, inifp)
+-	struct stf_softc *sc;
+-	struct in6_addr *in6;
+-	struct ifnet *inifp;	/* incoming interface */
++stf_checkaddr6(struct stf_softc *sc, struct in6_addr *in6, struct ifnet *inifp)
+ {
+ 	/*
+ 	 * check 6to4 addresses
+@@ -688,9 +814,7 @@
+ }
+ 
+ void
+-in_stf_input(m, off)
+-	struct mbuf *m;
+-	int off;
++in_stf_input(struct mbuf *m, int off)
+ {
+ 	int proto;
+ 	struct stf_softc *sc;
+@@ -698,6 +822,7 @@
+ 	struct ip6_hdr *ip6;
+ 	u_int8_t otos, itos;
+ 	struct ifnet *ifp;
++	struct route_in6 rin6;
+ 
+ 	proto = mtod(m, struct ip *)->ip_p;
+ 
+@@ -721,6 +846,17 @@
+ 	mac_ifnet_create_mbuf(ifp, m);
+ #endif
+ 
++#if STF_DEBUG
++	{
++		char buf[INET6_ADDRSTRLEN + 1];
++		memset(&buf, 0, sizeof(buf));
++
++		ip_sprintf(buf, &ip->ip_dst);
++		DEBUG_PRINTF(1, "%s: ip->ip_dst = %s\n", __func__, buf);
++		ip_sprintf(buf, &ip->ip_src);
++		DEBUG_PRINTF(1, "%s: ip->ip_src = %s\n", __func__, buf);
++	}
++#endif
+ 	/*
+ 	 * perform sanity check against outer src/dst.
+ 	 * for source, perform ingress filter as well.
+@@ -741,6 +877,17 @@
+ 	}
+ 	ip6 = mtod(m, struct ip6_hdr *);
+ 
++#if STF_DEBUG
++	{
++		char buf[INET6_ADDRSTRLEN + 1];
++		memset(&buf, 0, sizeof(buf));
++
++		ip6_sprintf(buf, &ip6->ip6_dst);
++		DEBUG_PRINTF(1, "%s: ip6->ip6_dst = %s\n", __func__, buf);
++		ip6_sprintf(buf, &ip6->ip6_src);
++		DEBUG_PRINTF(1, "%s: ip6->ip6_src = %s\n", __func__, buf);
++	}
++#endif
+ 	/*
+ 	 * perform sanity check against inner src/dst.
+ 	 * for source, perform ingress filter as well.
+@@ -751,6 +898,41 @@
+ 		return;
+ 	}
+ 
++	/*
++	 * reject packets with private address range.
++	 * (requirement from RFC3056 section 2 1st paragraph)
++	 */
++	if ((IN6_IS_ADDR_6TO4(&ip6->ip6_src) && isrfc1918addr(&ip->ip_src)) ||
++	    (IN6_IS_ADDR_6TO4(&ip6->ip6_dst) && isrfc1918addr(&ip->ip_dst))) {
++		m_freem(m);
++		return;
++	}
++
++	/*
++	 * Ignore if the destination is the same stf interface because
++	 * all of valid IPv6 outgoing traffic should go interfaces
++	 * except for it.
++	 */
++	memset(&rin6, 0, sizeof(rin6));
++	rin6.ro_dst.sin6_len = sizeof(rin6.ro_dst);
++	rin6.ro_dst.sin6_family = AF_INET6;
++	memcpy(&rin6.ro_dst.sin6_addr, &ip6->ip6_dst,
++	       sizeof(rin6.ro_dst.sin6_addr));
++	rtalloc((struct route *)&rin6);
++	if (rin6.ro_rt == NULL) {
++		DEBUG_PRINTF(1, "%s: no IPv6 dst.  Ignored.\n", __func__);
++		m_free(m);
++		return;
++	}
++	if ((rin6.ro_rt->rt_ifp == ifp) &&
++	    (!IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &rin6.ro_dst.sin6_addr))) {
++		DEBUG_PRINTF(1, "%s: IPv6 dst is the same stf.  Ignored.\n", __func__);
++		RTFREE(rin6.ro_rt);
++		m_free(m);
++		return;
++	}
++	RTFREE(rin6.ro_rt);
++
+ 	itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
+ 	if ((ifp->if_flags & IFF_LINK1) != 0)
+ 		ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
+@@ -760,7 +942,7 @@
+ 	ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
+ 
+ 	m->m_pkthdr.rcvif = ifp;
+-	
++
+ 	if (bpf_peers_present(ifp->if_bpf)) {
+ 		/*
+ 		 * We need to prepend the address family as
+@@ -773,6 +955,7 @@
+ 		bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
+ 	}
+ 
++	DEBUG_PRINTF(1, "%s: netisr_dispatch(NETISR_IPV6)\n", __func__);
+ 	/*
+ 	 * Put the packet to the network layer input queue according to the
+ 	 * specified address family.
+@@ -786,27 +969,277 @@
+ 
+ /* ARGSUSED */
+ static void
+-stf_rtrequest(cmd, rt, info)
+-	int cmd;
+-	struct rtentry *rt;
+-	struct rt_addrinfo *info;
++stf_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
+ {
++
+ 	RT_LOCK_ASSERT(rt);
+ 	rt->rt_rmx.rmx_mtu = IPV6_MMTU;
+ }
+ 
++/* Check whether we have at least one instance with IFF_UP. */
+ static int
+-stf_ioctl(ifp, cmd, data)
+-	struct ifnet *ifp;
+-	u_long cmd;
+-	caddr_t data;
++stf_is_up(struct ifnet *ifp)
+ {
++	struct stf_softc *scp;
++	struct stf_softc *sc_cur;
++	struct stf_softc *sc_is_up;
++
++	sc_is_up = NULL;
++	if ((sc_cur = ifp->if_softc) == NULL)
++		return (EINVAL);
++
++	mtx_lock(&stf_mtx);
++	LIST_FOREACH(scp, &V_stf_softc_list, stf_list) {
++		if (scp == sc_cur)
++			continue;
++		if ((STF2IFP(scp)->if_flags & IFF_UP) != 0) {
++			sc_is_up = scp;
++			break;
++		}
++	}
++	mtx_unlock(&stf_mtx);
++
++	/* We already has at least one instance with IFF_UP. */
++	if (stf_is_up != NULL)
++		return (ENOSPC);
++
++	return (0);
++}
++
++static struct sockaddr_in *
++stf_getin4addr_in6(struct sockaddr_in *sin,
++		   struct ifaddr *ifa,
++		   struct in6_addr *in6)
++{
++	struct sockaddr_in6 sin6;
++
++	DEBUG_PRINTF(1, "%s: enter.\n", __func__);
++	if (ifa == NULL || in6 == NULL)
++		return NULL;
++
++	memset(&sin6, 0, sizeof(sin6));
++	memcpy(&sin6.sin6_addr, in6, sizeof(sin6.sin6_addr));
++	sin6.sin6_len = sizeof(sin6);
++	sin6.sin6_family = AF_INET6;
++
++	return(stf_getin4addr_sin6(sin, ifa, &sin6));
++}
++
++static struct sockaddr_in *
++stf_getin4addr_sin6(struct sockaddr_in *sin,
++		    struct ifaddr *ifa,
++		    struct sockaddr_in6 *sin6)
++{
++	struct in6_ifaddr ia6;
++	int i;
++
++	DEBUG_PRINTF(1, "%s: enter.\n", __func__);
++	if (ifa == NULL || sin6 == NULL)
++		return NULL;
++
++	memset(&ia6, 0, sizeof(ia6));
++	memcpy(&ia6, ifatoia6(ifa), sizeof(ia6));
++
++	/*
++	 * Use prefixmask information from ifa, and
++	 * address information from sin6.
++	 */
++	ia6.ia_addr.sin6_family = AF_INET6;
++	ia6.ia_ifa.ifa_addr = (struct sockaddr *)&ia6.ia_addr;
++	ia6.ia_ifa.ifa_dstaddr = NULL;
++	ia6.ia_ifa.ifa_netmask = (struct sockaddr *)&ia6.ia_prefixmask;
++
++#if STF_DEBUG
++	{
++		char buf[INET6_ADDRSTRLEN + 1];
++		memset(&buf, 0, sizeof(buf));
++
++		ip6_sprintf(buf, &sin6->sin6_addr);
++		DEBUG_PRINTF(1, "%s: sin6->sin6_addr = %s\n", __func__, buf);
++		ip6_sprintf(buf, &ia6.ia_addr.sin6_addr);
++		DEBUG_PRINTF(1, "%s: ia6.ia_addr.sin6_addr = %s\n", __func__, buf);
++		ip6_sprintf(buf, &ia6.ia_prefixmask.sin6_addr);
++		DEBUG_PRINTF(1, "%s: ia6.ia_prefixmask.sin6_addr = %s\n", __func__, buf);
++	}
++#endif
++
++	/*
++	 * When (src addr & src mask) != (dst (sin6) addr & src mask),
++	 * the dst is not in the 6rd domain.  The IPv4 address must
++	 * not be used.
++	 */
++	for (i = 0; i < sizeof(ia6.ia_addr.sin6_addr); i++) {
++		if ((((u_char *)&ia6.ia_addr.sin6_addr)[i] &
++		     ((u_char *)&ia6.ia_prefixmask.sin6_addr)[i])
++		    !=
++		    (((u_char *)&sin6->sin6_addr)[i] &
++		     ((u_char *)&ia6.ia_prefixmask.sin6_addr)[i]))
++			return NULL;
++	}
++
++	/* After the mask check, overwrite ia6.ia_addr with sin6. */
++	memcpy(&ia6.ia_addr, sin6, sizeof(ia6.ia_addr));
++	return(stf_getin4addr(sin, (struct ifaddr *)&ia6, 0));
++}
++
++static struct sockaddr_in *
++stf_getin4addr(struct sockaddr_in *sin,
++	       struct ifaddr *ifa,
++	       int flags)
++{
++	struct in_addr *in;
++	struct sockaddr_in6 *sin6;
++	struct in6_ifaddr *ia6;
++
++	DEBUG_PRINTF(1, "%s: enter.\n", __func__);
++	if (ifa == NULL ||
++	    ifa->ifa_addr == NULL ||
++	    ifa->ifa_addr->sa_family != AF_INET6)
++		return NULL;
++
++	sin6 = satosin6(ifa->ifa_addr);
++	ia6 = ifatoia6(ifa);
++
++	if ((flags & STF_GETIN4_USE_CACHE) &&
++	    (ifa->ifa_dstaddr != NULL) &&
++	    (ifa->ifa_dstaddr->sa_family == AF_INET)) {
++		/*
++		 * XXX: ifa_dstaddr is used as a cache of the
++		 * extracted IPv4 address.
++		 */
++		memcpy(sin, satosin(ifa->ifa_dstaddr), sizeof(*sin));
++#if STF_DEBUG
++		{
++			char buf[INET6_ADDRSTRLEN + 1];
++			memset(&buf, 0, sizeof(buf));
++
++			ip_sprintf(buf, &sin->sin_addr);
++			DEBUG_PRINTF(1, "%s: cached address was used = %s\n", __func__, buf);
++		}
++#endif
++		return (sin);
++	}
++	memset(sin, 0, sizeof(*sin));
++	in = &sin->sin_addr;
++
++#if STF_DEBUG
++	{
++		char buf[INET6_ADDRSTRLEN + 1];
++		memset(&buf, 0, sizeof(buf));
++
++		ip6_sprintf(buf, &sin6->sin6_addr);
++		DEBUG_PRINTF(1, "%s: sin6->sin6_addr = %s\n", __func__, buf);
++	}
++#endif
++
++	if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) {
++		/* 6to4 (RFC 3056) */
++		bcopy(GET_V4(&sin6->sin6_addr), in, sizeof(*in));
++		if (isrfc1918addr(in))
++			return NULL;
++	} else {
++		/* 6rd (RFC 5569) */
++		struct in6_addr buf;
++		u_char *p = (u_char *)&buf;
++		u_char *q = (u_char *)in;
++		u_int residue = 0;
++		u_char mask;
++		int i;
++		u_int plen;
++
++		/*
++		 * 6rd-relays IPv6 prefix is located at a 32-bit just
++		 * after the prefix edge.
++		 */
++		plen = in6_mask2len(&satosin6(ifa->ifa_netmask)->sin6_addr, NULL);
++		if (32 < plen)
++			return NULL;
++
++		memcpy(&buf, &sin6->sin6_addr, sizeof(buf));
++		p += plen / 8;
++		residue = plen % 8;
++		mask = ~((u_char)(-1) >> residue);
++
++		/*
++		 * The p points head of the IPv4 address part in
++		 * bytes.  The residue is a bit-shift factor when
++		 * prefixlen is not a multiple of 8.
++		 */
++		for (i = 0; i < 4; i++) {
++			DEBUG_PRINTF(2, "p[%d] = %d\n", i, p[i]);
++			DEBUG_PRINTF(2, "residue = %d\n", residue);
++			if (residue) {
++				p[i] <<= residue;
++				DEBUG_PRINTF(2, "p[%d] << residue = %d\n",
++					     i, p[i]);
++				DEBUG_PRINTF(2, "mask = %x\n",
++					     mask);
++				DEBUG_PRINTF(2, "p[%d + 1] & mask = %d\n",
++					     i, p[i + 1] & mask);
++				DEBUG_PRINTF(2, "p[%d + 1] & mask >> (8 - residue) = %d\n",
++					     i, (p[i + 1] & mask) >> (8-residue));
++				p[i] |= ((p[i+1] & mask) >> (8 - residue));
++			}
++			q[i] = p[i];
++		}
++	}
++#if STF_DEBUG
++	{
++		char buf[INET6_ADDRSTRLEN + 1];
++		memset(&buf, 0, sizeof(buf));
++
++		ip_sprintf(buf, in);
++		DEBUG_PRINTF(1, "%s: in->in_addr = %s\n", __func__, buf);
++		DEBUG_PRINTF(1, "%s: leave\n", __func__);
++	}
++#endif
++	if (flags & STF_GETIN4_USE_CACHE) {
++		DEBUG_PRINTF(1, "%s: try to access ifa->ifa_dstaddr.\n", __func__);
++		ifa->ifa_dstaddr = (struct sockaddr *)&ia6->ia_dstaddr;
++		DEBUG_PRINTF(1, "%s: try to memset 0 to ia_dstaddr.\n", __func__);
++		memset(&ia6->ia_dstaddr, 0, sizeof(ia6->ia_dstaddr));
++		DEBUG_PRINTF(1, "%s: try to memcpy ifa->ifa_dstaddr.\n", __func__);
++		memcpy((struct sockaddr_in *)ifa->ifa_dstaddr,
++		       sin, sizeof(struct sockaddr_in));
++		DEBUG_PRINTF(1, "%s: try to set sa_family.\n", __func__);
++		ifa->ifa_dstaddr->sa_family = AF_INET;
++		DEBUG_PRINTF(1, "%s: in->in_addr is stored in ifa_dstaddr.\n",
++			     __func__);
++	}
++	return (sin);
++}
++
++static int
++stf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
++{
+ 	struct ifaddr *ifa;
+ 	struct ifreq *ifr;
+-	struct sockaddr_in6 *sin6;
+-	struct in_addr addr;
++	struct sockaddr_in in4;
+ 	int error;
+ 
++	/*
++	 * Sanity check: if more than two interfaces have IFF_UP, do
++	 * if_down() for all of them except for the specified one.
++	 */
++	if (ifp->if_flags & IFF_UP) {
++		struct stf_softc *sc_cur = ifp->if_softc;
++		struct stf_softc *sc;
++
++		mtx_lock(&stf_mtx);
++		LIST_FOREACH(sc, &V_stf_softc_list, stf_list) {
++			if (sc == sc_cur)
++				continue;
++			if ((STF2IFP(sc)->if_flags & IFF_UP) != 0) {
++				if_printf(STF2IFP(sc),
++					  "marked as DOWN because at least "
++					  "one instance of stf(4) is already "
++					  "working.\n");
++				if_down(STF2IFP(sc));
++			}
++		}
++		mtx_unlock(&stf_mtx);
++	}
++
+ 	error = 0;
+ 	switch (cmd) {
+ 	case SIOCSIFADDR:
+@@ -815,17 +1248,16 @@
+ 			error = EAFNOSUPPORT;
+ 			break;
+ 		}
+-		sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
+-		if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) {
++		if (stf_getin4addr(&in4, ifa, 0) == NULL) {
+ 			error = EINVAL;
+ 			break;
+ 		}
+-		bcopy(GET_V4(&sin6->sin6_addr), &addr, sizeof(addr));
+-		if (isrfc1918addr(&addr)) {
+-			error = EINVAL;
+-			break;
+-		}
+-
++		/*
++		 * XXX: ifa_dstaddr is used as a cache of the
++		 * extracted IPv4 address.
++		 */
++		if (ifa->ifa_dstaddr != NULL)
++			ifa->ifa_dstaddr->sa_family = AF_UNSPEC;
+ 		ifa->ifa_rtrequest = stf_rtrequest;
+ 		ifp->if_flags |= IFF_UP;
+ 		break;
+Index: share/man/man4/stf.4
+===================================================================
+--- share/man/man4/stf.4	(revision 212990)
++++ share/man/man4/stf.4	(working copy)
+@@ -1,6 +1,7 @@
+ .\"     $KAME: stf.4,v 1.35 2001/05/02 06:24:49 itojun Exp $
+ .\"
+ .\" Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
++.\" Copyright (c) 2010 Hiroki Sato <hrs@FreeBSD.org>
+ .\" All rights reserved.
+ .\"
+ .\" Redistribution and use in source and binary forms, with or without
+@@ -29,7 +30,7 @@
+ .\"
+ .\" $FreeBSD$
+ .\"
+-.Dd April 27, 2001
++.Dd September 23, 2010
+ .Dt STF 4
+ .Os
+ .Sh NAME
+@@ -42,22 +43,12 @@
+ .Sh DESCRIPTION
+ The
+ .Nm
+-interface supports
+-.Dq 6to4
+-IPv6 in IPv4 encapsulation.
+-It can tunnel IPv6 traffic over IPv4, as specified in
+-.Li RFC3056 .
++interface supports IPv6 in IPv4 encapsulation by
++tunneling IPv6 traffic over IPv4, as specified in
++.Li RFC3056 Pq 6to4
++and
++.Li RFC5569 Pq 6rd .
+ .Pp
+-For ordinary nodes in 6to4 site, you do not need
+-.Nm
+-interface.
+-The
+-.Nm
+-interface is necessary for site border router
+-(called
+-.Dq 6to4 router
+-in the specification).
+-.Pp
+ Each
+ .Nm
+ interface is created at runtime using interface cloning.
+@@ -72,12 +63,28 @@
+ .Pp
+ Due to the way 6to4 protocol is specified,
+ .Nm
+-interface requires certain configuration to work properly.
++interface requires certain configuration to work properly.  Two
++different protocols defined in RFC3056 and RFC5569 are basically the
++same as each other except for address handling, so
++.Nm
++decides its behavior based on the configured IPv6 addresses as
++explained in the following.
++The
++.Nm
++interface can be configured with multiple IPv6 addresses including
++both 6to4 and 6rd.
++.Sh RFC3056 (a.k.a. 6to4)
+ Single
+-(no more than 1)
+-valid 6to4 address needs to be configured to the interface.
+-.Dq A valid 6to4 address
+-is an address which has the following properties.
++.Pq no more than 1 valid 6to4 address needs to be configured to the interface.
++.Dq a valid 6to4 address
++is an address which has the following properties.  For ordinary nodes
++in 6to4 site, you do not need
++.Nm
++interface; it is necessary only for site border router
++(called
++.Dq 6to4 router
++in the specification).
++.Pp
+ If any of the following properties are not satisfied,
+ .Nm
+ raises runtime error on packet transmission.
+@@ -110,8 +117,80 @@
+ .Nm
+ interface will check the IPv4 source address on packets,
+ if the IPv6 prefix length is larger than 16.
++.Sh RFC5569 (a.k.a. 6rd)
++The
++.Nm
++interface works in the 6rd mode when one or more IPv6 addresses that
++consists of an IPv6 prefix and 32-bit IPv4 part with a prefix length
++equal to or shorter than 64.  In 6rd protocol, an IPv6 address
++.Li 2001:db8:c000:205::1/32
++means the following, for example:
++.Bl -bullet
++.It
++The 6rd relay prefix is
++.Li 2001:db8::/32 .
++.It
++The 6rd router's IPv4 address is
++.Li 192.0.2.5 .
++.El
+ .Pp
++As you can see the IPv4 address is embedded in the IPv6 address just
++after the prefix.  While you can choose an IPv6 prefix length other
++than 32, it must be from 0 to 32.
++.Pp
++Assuming this address is configured on the
+ .Nm
++interface, it does the following:
++.Bl -bullet
++.It
++An incoming IPv6 packet on
++.Nm
++will be encapsuled in an IPv4 packet with the source address
++.Li 192.0.2.5
++and then the IPv4 packet is delivered based on the IPv4 routing table.
++The IPv4 destination address is calculated from the destination
++address of the original IPv6 packet in the same way as the source.
++.It
++An incoming IPv4 packet which encapsules an IPv6 packet whose
++destination address matches a 6rd prefix with embedded IPv4 address
++configured on the
++.Nm
++interface, the IPv6 packet will be decapsulated and delivered based on
++the IPv6 routing table.  Note that
++.Nm
++interface normally has a route which covers whole range of a 6rd relay
++prefix, the delivered IPv6 packet can return to
++.Nm
++if there is no more specific route.  In that case, the returned packet
++will be discarded silently.
++.El
++.\" XXX: example configuration will be added
++.\" .Pp
++.\" By using this interface, you can configure a 6rd domain.  For simplicity,
++.\" we assume the following here:
++.\" .Bl -bullet
++.\" .It
++.\" A 6rd Customer, who has an IPv6/IPv4 LAN and an IPv4-only access
++.\" toward network of his Internet Service Provider.  The Customer has
++.\" a router called
++.\" .Dq CE Pq Customer Edge
++.\" Router, which can communicate between his LAN and the ISP over IPv4
++.\" and encapsulate  
++.\" his networks.
++.\" .It
++.\" A 6rd Provider, who provides IPv6 Internet reachability by using 6rd
++.\" protocol.  The Provider offers access to a router called
++.\" .Dq PE Pq Provider Edge
++.\" Router, which can communicate with 
++.\" .El
++.\" .Pp
++.\" A 6rd customer
++.\" needs to configure
++.\" .Nm
++.\" on his CE (Customer Edge) router.
++.Sh Other Functionality of the Interface
++.Pp
++.Nm
+ can be configured to be ECN friendly.
+ This can be configured by
+ .Dv IFF_LINK1 .
+@@ -147,9 +226,6 @@
+ Packets with limited broadcast address as outer IPv4 source/destination
+ .Pq Li 255.0.0.0/8
+ .It
+-Packets with private address as outer IPv4 source/destination
+-.Pq Li 10.0.0.0/8 , 172.16.0.0/12 , 192.168.0.0/16
+-.It
+ Packets with subnet broadcast address as outer IPv4 source/destination.
+ The check is made against subnet broadcast addresses for
+ all of the directly connected subnets.
+@@ -164,6 +240,11 @@
+ inner IPv6 address, if the IPv6 address matches 6to4 prefix.
+ .El
+ .Pp
++In addition to them, packets with private address as outer IPv4
++source/destination
++.Pq Li 10.0.0.0/8 , 172.16.0.0/12 , 192.168.0.0/16
++are filtered out only in the 6to4 mode.
++.Pp
+ It is recommended to filter/audit
+ incoming IPv4 packet with IP protocol number 41, as necessary.
+ It is also recommended to filter/audit encapsulated IPv6 packets as well.
diff --git a/net/stf-6rd-kmod/pkg-descr b/net/stf-6rd-kmod/pkg-descr
new file mode 100644
index 000000000000..3528c3cc9ad7
--- /dev/null
+++ b/net/stf-6rd-kmod/pkg-descr
@@ -0,0 +1,8 @@
+Port for package building of 6rd patched stf(4) kernel lodable modules.
+
+This port supports only 8.1 and 8.2 releases.
+
+This patch was developed by hrs and obtained from
+http://people.allbsd.org/~hrs/FreeBSD/stf_6rd_20100923-1.diff
+
+WWW: http://people.FreeBSD.org/~kuriyama/6rd/
diff --git a/net/stf-6rd-kmod/pkg-message b/net/stf-6rd-kmod/pkg-message
new file mode 100644
index 000000000000..59a8274410a3
--- /dev/null
+++ b/net/stf-6rd-kmod/pkg-message
@@ -0,0 +1,11 @@
+To use these modules, add loading lines in /boot/loader.conf:
+
+if_stf_load="YES"
+
+If you have if_stf.ko in /boot/kernel directory, overwrite it by
+copying from /boot/modules or remove it from /boot/kernel.
+
+6rd setting is up to your ISP.  E.g. SAKURA Internet in Japan provides
+example setting in their site (in Japanese).
+
+http://research.sakura.ad.jp/6rd-trial/6rd-trial-freebsd8/
diff --git a/net/stf-6rd-kmod/pkg-plist b/net/stf-6rd-kmod/pkg-plist
new file mode 100644
index 000000000000..e9ef29e780d0
--- /dev/null
+++ b/net/stf-6rd-kmod/pkg-plist
@@ -0,0 +1,5 @@
+@cwd /
+%%KMODDIR%%/if_stf.ko
+%%KMODDIR%%/if_stf.ko.symbols
+@exec /usr/sbin/kldxref /%%KMODDIR%%
+@unexec /usr/sbin/kldxref /%%KMODDIR%%