diff --git a/extensions/compat_xtnu.h b/extensions/compat_xtnu.h
index 9583db7..0a267c6 100644
--- a/extensions/compat_xtnu.h
+++ b/extensions/compat_xtnu.h
@@ -17,6 +17,18 @@ struct net_device;
 struct rtable;
 struct sk_buff;
 
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 27)
+enum {
+	NFPROTO_UNSPEC =  0,
+	NFPROTO_IPV4   =  2,
+	NFPROTO_ARP    =  3,
+	NFPROTO_BRIDGE =  7,
+	NFPROTO_IPV6   = 10,
+	NFPROTO_DECNET = 12,
+	NFPROTO_NUMPROTO,
+};
+#endif
+
 struct xtnu_match {
 	struct list_head list;
 	char name[XT_FUNCTION_MAXNAMELEN - 1 - sizeof(void *)];
diff --git a/extensions/xt_CHAOS.c b/extensions/xt_CHAOS.c
index 15d48f7..4512a28 100644
--- a/extensions/xt_CHAOS.c
+++ b/extensions/xt_CHAOS.c
@@ -131,7 +131,8 @@ static bool chaos_tg_check(const char *tablename, const void *entry,
 
 static struct xt_target chaos_tg_reg = {
 	.name       = "CHAOS",
-	.family     = AF_INET,
+	.revision   = 0,
+	.family     = NFPROTO_IPV4,
 	.table      = "filter",
 	.hooks      = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) |
 	              (1 << NF_INET_LOCAL_OUT),
@@ -145,27 +146,27 @@ static int __init chaos_tg_init(void)
 {
 	int ret = -EINVAL;
 
-	xm_tcp = xt_request_find_match(AF_INET, "tcp", 0);
+	xm_tcp = xt_request_find_match(NFPROTO_IPV4, "tcp", 0);
 	if (xm_tcp == NULL) {
 		printk(KERN_WARNING PFX "Error: Could not find or load "
 		       "\"tcp\" match\n");
 		return -EINVAL;
 	}
 
-	xt_reject = xt_request_find_target(AF_INET, "REJECT", 0);
+	xt_reject = xt_request_find_target(NFPROTO_IPV4, "REJECT", 0);
 	if (xt_reject == NULL) {
 		printk(KERN_WARNING PFX "Error: Could not find or load "
 		       "\"REJECT\" target\n");
 		goto out2;
 	}
 
-	xt_tarpit   = xt_request_find_target(AF_INET, "TARPIT", 0);
+	xt_tarpit   = xt_request_find_target(NFPROTO_IPV4, "TARPIT", 0);
 	have_tarpit = xt_tarpit != NULL;
 	if (!have_tarpit)
 		printk(KERN_WARNING PFX "Warning: Could not find or load "
 		       "\"TARPIT\" target\n");
 
-	xt_delude   = xt_request_find_target(AF_INET, "DELUDE", 0);
+	xt_delude   = xt_request_find_target(NFPROTO_IPV4, "DELUDE", 0);
 	have_delude = xt_delude != NULL;
 	if (!have_delude)
 		printk(KERN_WARNING PFX "Warning: Could not find or load "
diff --git a/extensions/xt_DELUDE.c b/extensions/xt_DELUDE.c
index 2e2829c..de03ee3 100644
--- a/extensions/xt_DELUDE.c
+++ b/extensions/xt_DELUDE.c
@@ -157,7 +157,7 @@ static unsigned int delude_tg(struct sk_buff **pskb,
 static struct xt_target delude_tg_reg __read_mostly = {
 	.name     = "DELUDE",
 	.revision = 0,
-	.family   = AF_INET,
+	.family   = NFPROTO_IPV4,
 	.table    = "filter",
 	.hooks    = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD),
 	.proto    = IPPROTO_TCP,
diff --git a/extensions/xt_DHCPADDR.c b/extensions/xt_DHCPADDR.c
index f57089d..ff893e5 100644
--- a/extensions/xt_DHCPADDR.c
+++ b/extensions/xt_DHCPADDR.c
@@ -127,7 +127,7 @@ static unsigned int dhcpaddr_tg(struct sk_buff **pskb,
 static struct xt_target dhcpaddr_tg_reg __read_mostly = {
 	.name       = "DHCPADDR",
 	.revision   = 0,
-	.family     = PF_INET,
+	.family     = NFPROTO_IPV4,
 	.proto      = IPPROTO_UDP,
 	.table      = "mangle",
 	.target     = dhcpaddr_tg,
@@ -138,7 +138,7 @@ static struct xt_target dhcpaddr_tg_reg __read_mostly = {
 static struct xt_match dhcpaddr_mt_reg __read_mostly = {
 	.name       = "dhcpaddr",
 	.revision   = 0,
-	.family     = PF_INET,
+	.family     = NFPROTO_IPV4,
 	.proto      = IPPROTO_UDP,
 	.match      = dhcpaddr_mt,
 	.matchsize  = XT_ALIGN(sizeof(struct dhcpaddr_info)),
diff --git a/extensions/xt_ECHO.c b/extensions/xt_ECHO.c
index 9b024eb..7d3c2fa 100644
--- a/extensions/xt_ECHO.c
+++ b/extensions/xt_ECHO.c
@@ -109,7 +109,7 @@ static unsigned int echo_tg4(struct sk_buff **poldskb,
 static struct xt_target echo_tg_reg __read_mostly = {
 	.name       = "ECHO",
 	.revision   = 0,
-	.family     = AF_INET,
+	.family     = NFPROTO_IPV4,
 	.proto      = IPPROTO_UDP,
 	.table      = "filter",
 	.target     = echo_tg4,
diff --git a/extensions/xt_IPMARK.c b/extensions/xt_IPMARK.c
index 89756ef..fa45fbc 100644
--- a/extensions/xt_IPMARK.c
+++ b/extensions/xt_IPMARK.c
@@ -87,7 +87,7 @@ static struct xt_target ipmark_tg_reg[] __read_mostly = {
 	{
 		.name       = "IPMARK",
 		.revision   = 0,
-		.family     = PF_INET,
+		.family     = NFPROTO_IPV4,
 		.table      = "mangle",
 		.target     = ipmark_tg4,
 		.targetsize = XT_ALIGN(sizeof(struct xt_ipmark_tginfo)),
@@ -96,7 +96,7 @@ static struct xt_target ipmark_tg_reg[] __read_mostly = {
 	{
 		.name       = "IPMARK",
 		.revision   = 0,
-		.family     = PF_INET6,
+		.family     = NFPROTO_IPV6,
 		.table      = "mangle",
 		.target     = ipmark_tg6,
 		.targetsize = XT_ALIGN(sizeof(struct xt_ipmark_tginfo)),
diff --git a/extensions/xt_LOGMARK.c b/extensions/xt_LOGMARK.c
index 754d26b..dc373d4 100644
--- a/extensions/xt_LOGMARK.c
+++ b/extensions/xt_LOGMARK.c
@@ -101,7 +101,7 @@ static struct xt_target logmark_tg_reg[] __read_mostly = {
 	{
 		.name       = "LOGMARK",
 		.revision   = 0,
-		.family     = AF_INET,
+		.family     = NFPROTO_IPV4,
 		.checkentry = logmark_tg_check,
 		.target     = logmark_tg,
 		.targetsize = sizeof(struct xt_logmark_tginfo),
@@ -110,7 +110,7 @@ static struct xt_target logmark_tg_reg[] __read_mostly = {
 	{
 		.name       = "LOGMARK",
 		.revision   = 0,
-		.family     = AF_INET6,
+		.family     = NFPROTO_IPV6,
 		.checkentry = logmark_tg_check,
 		.target     = logmark_tg,
 		.targetsize = sizeof(struct xt_logmark_tginfo),
diff --git a/extensions/xt_SYSRQ.c b/extensions/xt_SYSRQ.c
index a2aed02..bfa2923 100644
--- a/extensions/xt_SYSRQ.c
+++ b/extensions/xt_SYSRQ.c
@@ -105,14 +105,14 @@ static unsigned int sysrq_tg6(struct sk_buff **pskb,
 static bool sysrq_tg_check(const char *table, const void *ventry,
     const struct xt_target *target, void *targinfo, unsigned int hook_mask)
 {
-	if (target->family == PF_INET) {
+	if (target->family == NFPROTO_IPV4) {
 		const struct ipt_entry *entry = ventry;
 
 		if ((entry->ip.proto != IPPROTO_UDP &&
 		    entry->ip.proto != IPPROTO_UDPLITE) ||
 		    entry->ip.invflags & XT_INV_PROTO)
 			goto out;
-	} else if (target->family == PF_INET6) {
+	} else if (target->family == NFPROTO_IPV6) {
 		const struct ip6t_entry *entry = ventry;
 
 		if ((entry->ipv6.proto != IPPROTO_UDP &&
@@ -131,16 +131,16 @@ static bool sysrq_tg_check(const char *table, const void *ventry,
 static struct xt_target sysrq_tg_reg[] __read_mostly = {
 	{
 		.name       = "SYSRQ",
-		.family     = PF_INET,
 		.revision   = 0,
+		.family     = NFPROTO_IPV4,
 		.target     = sysrq_tg4,
 		.checkentry = sysrq_tg_check,
 		.me         = THIS_MODULE,
 	},
 	{
 		.name       = "SYSRQ",
-		.family     = PF_INET6,
 		.revision   = 0,
+		.family     = NFPROTO_IPV6,
 		.target     = sysrq_tg6,
 		.checkentry = sysrq_tg_check,
 		.me         = THIS_MODULE,
diff --git a/extensions/xt_TARPIT.c b/extensions/xt_TARPIT.c
index 60957aa..a4a7624 100644
--- a/extensions/xt_TARPIT.c
+++ b/extensions/xt_TARPIT.c
@@ -179,7 +179,7 @@ static void tarpit_tcp(struct sk_buff *oldskb, unsigned int hook)
 
 	nf_ct_attach(nskb, oldskb);
 
-	NF_HOOK(PF_INET, NF_INET_LOCAL_OUT, nskb, NULL, nskb->dst->dev,
+	NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, nskb, NULL, nskb->dst->dev,
 		dst_output);
 	return;
 
@@ -226,7 +226,8 @@ tarpit_tg(struct sk_buff **pskb, const struct net_device *in,
 
 static struct xt_target tarpit_tg_reg __read_mostly = {
 	.name   = "TARPIT",
-	.family = AF_INET,
+	.revision = 0,
+	.family = NFPROTO_IPV4,
 	.table  = "filter",
 	.hooks  = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD),
 	.proto  = IPPROTO_TCP,
diff --git a/extensions/xt_TEE.c b/extensions/xt_TEE.c
index f07ef8b..4fe1cca 100644
--- a/extensions/xt_TEE.c
+++ b/extensions/xt_TEE.c
@@ -220,7 +220,8 @@ static bool tee_tg_check(const char *tablename, const void *entry,
 
 static struct xt_target tee_tg_reg __read_mostly = {
 	.name       = "TEE",
-	.family     = AF_INET,
+	.revision   = 0,
+	.family     = NFPROTO_IPV4,
 	.table      = "mangle",
 	.target     = tee_tg,
 	.targetsize = sizeof(struct xt_tee_tginfo),
diff --git a/extensions/xt_condition.c b/extensions/xt_condition.c
index 0b1dcbf..91d1e65 100644
--- a/extensions/xt_condition.c
+++ b/extensions/xt_condition.c
@@ -211,7 +211,7 @@ static struct xt_match condition_mt_reg[] __read_mostly = {
 	{
 		.name       = "condition",
 		.revision   = 0,
-		.family     = PF_INET,
+		.family     = NFPROTO_IPV4,
 		.matchsize  = XT_ALIGN(sizeof(struct xt_condition_mtinfo)),
 		.match      = condition_mt,
 		.checkentry = condition_mt_check,
@@ -221,7 +221,7 @@ static struct xt_match condition_mt_reg[] __read_mostly = {
 	{
 		.name       = "condition",
 		.revision   = 0,
-		.family     = PF_INET6,
+		.family     = NFPROTO_IPV6,
 		.matchsize  = XT_ALIGN(sizeof(struct xt_condition_mtinfo)),
 		.match      = condition_mt,
 		.checkentry = condition_mt_check,
diff --git a/extensions/xt_fuzzy.c b/extensions/xt_fuzzy.c
index 774414b..b09afe1 100644
--- a/extensions/xt_fuzzy.c
+++ b/extensions/xt_fuzzy.c
@@ -148,7 +148,7 @@ static struct xt_match fuzzy_mt_reg[] __read_mostly = {
 	{
 		.name       = "fuzzy",
 		.revision   = 0,
-		.family     = PF_INET,
+		.family     = NFPROTO_IPV4,
 		.match      = fuzzy_mt,
 		.checkentry = fuzzy_mt_check,
 		.matchsize  = XT_ALIGN(sizeof(struct xt_fuzzy_mtinfo)),
@@ -157,7 +157,7 @@ static struct xt_match fuzzy_mt_reg[] __read_mostly = {
 	{
 		.name       = "fuzzy",
 		.revision   = 0,
-		.family     = PF_INET6,
+		.family     = NFPROTO_IPV6,
 		.match      = fuzzy_mt,
 		.checkentry = fuzzy_mt_check,
 		.matchsize  = XT_ALIGN(sizeof(struct xt_fuzzy_mtinfo)),
diff --git a/extensions/xt_geoip.c b/extensions/xt_geoip.c
index 8b37b17..1cf0b86 100644
--- a/extensions/xt_geoip.c
+++ b/extensions/xt_geoip.c
@@ -223,8 +223,9 @@ static void xt_geoip_mt_destroy(const struct xt_match *match, void *matchinfo)
 }
 
 static struct xt_match xt_geoip_match __read_mostly = {
-	.family     = AF_INET,
 	.name       = "geoip",
+	.revision   = 0,
+	.family     = NFPROTO_IPV4,
 	.match      = xt_geoip_mt,
 	.checkentry = xt_geoip_mt_checkentry,
 	.destroy    = xt_geoip_mt_destroy,
diff --git a/extensions/xt_ipp2p.c b/extensions/xt_ipp2p.c
index f1ffc3a..5472de5 100644
--- a/extensions/xt_ipp2p.c
+++ b/extensions/xt_ipp2p.c
@@ -869,7 +869,7 @@ ipp2p_mt(const struct sk_buff *skb, const struct net_device *in,
 static struct xt_match ipp2p_mt_reg __read_mostly = {
 	.name       = "ipp2p",
 	.revision   = 0,
-	.family     = AF_INET,
+	.family     = NFPROTO_IPV4,
 	.match      = ipp2p_mt,
 	.matchsize  = sizeof(struct ipt_p2p_info),
 	.me         = THIS_MODULE,
diff --git a/extensions/xt_portscan.c b/extensions/xt_portscan.c
index a1fbbfb..e9581be 100644
--- a/extensions/xt_portscan.c
+++ b/extensions/xt_portscan.c
@@ -236,7 +236,7 @@ static struct xt_match portscan_mt_reg[] __read_mostly = {
 	{
 		.name       = "portscan",
 		.revision   = 0,
-		.family     = PF_INET,
+		.family     = NFPROTO_IPV4,
 		.match      = portscan_mt,
 		.checkentry = portscan_mt_check,
 		.matchsize  = sizeof(struct xt_portscan_mtinfo),
@@ -246,7 +246,7 @@ static struct xt_match portscan_mt_reg[] __read_mostly = {
 	{
 		.name       = "portscan",
 		.revision   = 0,
-		.family     = PF_INET6,
+		.family     = NFPROTO_IPV6,
 		.match      = portscan_mt,
 		.checkentry = portscan_mt_check,
 		.matchsize  = sizeof(struct xt_portscan_mtinfo),
diff --git a/extensions/xt_quota2.c b/extensions/xt_quota2.c
index 66a89b1..1604f95 100644
--- a/extensions/xt_quota2.c
+++ b/extensions/xt_quota2.c
@@ -103,7 +103,7 @@ static struct quota_counter *q2_get_counter(const struct xt_quota_mtinfo2 *q)
 	                      proc_xt_quota);
 	if (p == NULL || IS_ERR(p))
 		goto out;
-		
+
 	p->owner        = THIS_MODULE;
 	p->data         = e;
 	p->read_proc    = quota_proc_read;
@@ -199,7 +199,7 @@ static struct xt_match quota_mt2_reg[] __read_mostly = {
 	{
 		.name       = "quota2",
 		.revision   = 2,
-		.family     = AF_INET,
+		.family     = NFPROTO_IPV4,
 		.checkentry = quota_mt2_check,
 		.match      = quota_mt2,
 		.destroy    = quota_mt2_destroy,  
@@ -209,7 +209,7 @@ static struct xt_match quota_mt2_reg[] __read_mostly = {
 	{
 		.name       = "quota2",
 		.revision   = 2,
-		.family     = AF_INET6,
+		.family     = NFPROTO_IPV6,
 		.checkentry = quota_mt2_check,
 		.match      = quota_mt2,
 		.destroy    = quota_mt2_destroy,