[NETFILTER]: x_tables: add port of hashlimit match for IPv4 and IPv6

Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index f619c65..7e61254 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -464,5 +464,19 @@
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+config NETFILTER_XT_MATCH_HASHLIMIT
+	tristate '"hashlimit" match support'
+	depends on NETFILTER_XTABLES
+	help
+	  This option adds a `hashlimit' match.
+
+	  As opposed to `limit', this match dynamically creates a hash table
+	  of limit buckets, based on your selection of source/destination
+	  addresses and/or ports.
+
+	  It enables you to express policies like `10kpps for any given
+	  destination address' or `500pps from any given source address'
+	  with a single rule.
+
 endmenu