[NETFILTER]: x_tables: add data member to struct xt_match

Shared match functions can use this to make runtime decisions basen on the
used match.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index 9d97102..03d1027 100644
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -185,6 +185,9 @@
 	/* Set this to THIS_MODULE if you are a module, otherwise NULL */
 	struct module *me;
 
+	/* Free to use by each match */
+	unsigned long data;
+
 	char *table;
 	unsigned int matchsize;
 	unsigned int hooks;