netfilter: ipset: Prepare ipset to support multiple networks for hash types

In order to support hash:net,net, hash:net,port,net etc. types,
arrays are introduced for the book-keeping of existing cidr sizes
and network numbers in a set.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>

include/linux/netfilter/ipset/ip_set.h

@@ -398,6 +398,8 @@ bitmap_bytes(u32 a, u32 b)
 	{ .bytes = ULLONG_MAX, .packets = ULLONG_MAX,	\
 	  .timeout = (map)->timeout }
 
+#define IP_SET_INIT_CIDR(a, b) ((a) ? (a) : (b))
+
 #define IPSET_CONCAT(a, b)		a##b
 #define IPSET_TOKEN(a, b)		IPSET_CONCAT(a, b)