[NETFILTER]: Add sysctl values missing from recent commit.

include/linux/sysctl.h

@@ -244,6 +244,7 @@ enum
 	NET_IPV4_NEIGH=17,
 	NET_IPV4_ROUTE=18,
 	NET_IPV4_FIB_HASH=19,
+	NET_IPV4_NETFILTER=20,
 
 	NET_IPV4_TCP_TIMESTAMPS=33,
 	NET_IPV4_TCP_WINDOW_SCALING=34,
@@ -358,6 +359,24 @@ enum
 	NET_IPV4_CONF_NOPOLICY=16,
 };
 
+/* /proc/sys/net/ipv4/netfilter */
+enum
+{
+	NET_IPV4_NF_CONNTRACK_MAX=1,
+	NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT=2,
+	NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV=3,
+	NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED=4,
+	NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT=5,
+	NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT=6,
+	NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK=7,
+	NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT=8,
+	NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE=9,
+	NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT=10,
+	NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM=11,
+	NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT=12,
+	NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT=13,
+};
+ 
 /* /proc/sys/net/ipv6 */
 enum {
 	NET_IPV6_CONF=16,