[NETFILTER]: arp_tables: per-netns arp_tables FILTER

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index aeb0c3b8..a9b4f60 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -31,6 +31,7 @@
 	struct xt_table		*iptable_filter;
 	struct xt_table		*iptable_mangle;
 	struct xt_table		*iptable_raw;
+	struct xt_table		*arptable_filter;
 #endif
 };
 #endif