netfilter: ipset: hash:ip,port,net set type support

The module implements the hash:ip,port,net type support in four flavours:
for IPv4 and IPv6, both without and with timeout support. The elements
are three dimensional: IPv4/IPv6 address, protocol/port and IPv4/IPv6
network address/prefix triples. The different prefixes are searched/matched
from the longest prefix to the shortes one (most specific to least).
In other words the processing time linearly grows with the number of
different prefixes in the set.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>

net/netfilter/ipset/Kconfig

@@ -79,4 +79,14 @@ config IP_SET_HASH_IPPORTIP
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+config IP_SET_HASH_IPPORTNET
+	tristate "hash:ip,port,net set support"
+	depends on IP_SET
+	help
+	  This option adds the hash:ip,port,net set type support, by which
+	  one can store IPv4/IPv6 address, protocol/port, and IPv4/IPv6
+	  network address/prefix triples in a set.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
 endif # IP_SET

net/netfilter/ipset/Makefile

@@ -16,3 +16,4 @@ obj-$(CONFIG_IP_SET_BITMAP_PORT) += ip_set_bitmap_port.o
 obj-$(CONFIG_IP_SET_HASH_IP) += ip_set_hash_ip.o
 obj-$(CONFIG_IP_SET_HASH_IPPORT) += ip_set_hash_ipport.o
 obj-$(CONFIG_IP_SET_HASH_IPPORTIP) += ip_set_hash_ipportip.o
+obj-$(CONFIG_IP_SET_HASH_IPPORTNET) += ip_set_hash_ipportnet.o