netfilter: ipset: hash:net,iface type introduced

The hash:net,iface type makes possible to store network address and
interface name pairs in a set. It's mostly suitable for egress
and ingress filtering. Examples:

        # ipset create test hash:net,iface
        # ipset add test 192.168.0.0/16,eth0
        # ipset add test 192.168.0.0/24,eth1

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

include/linux/netfilter/ipset/ip_set.h

@@ -105,6 +105,7 @@ enum {
 	IPSET_ATTR_IP2,
 	IPSET_ATTR_CIDR2,
 	IPSET_ATTR_IP2_TO,
+	IPSET_ATTR_IFACE,
 	__IPSET_ATTR_ADT_MAX,
 };
 #define IPSET_ATTR_ADT_MAX	(__IPSET_ATTR_ADT_MAX - 1)
@@ -153,6 +154,8 @@ enum ipset_cmd_flags {
 enum ipset_cadt_flags {
 	IPSET_FLAG_BIT_BEFORE	= 0,
 	IPSET_FLAG_BEFORE	= (1 << IPSET_FLAG_BIT_BEFORE),
+	IPSET_FLAG_BIT_PHYSDEV	= 1,
+	IPSET_FLAG_PHYSDEV	= (1 << IPSET_FLAG_BIT_PHYSDEV),
 };
 
 /* Commands with settype-specific attributes */
@@ -212,6 +215,8 @@ enum ip_set_feature {
 	IPSET_TYPE_IP2 = (1 << IPSET_TYPE_IP2_FLAG),
 	IPSET_TYPE_NAME_FLAG = 4,
 	IPSET_TYPE_NAME = (1 << IPSET_TYPE_NAME_FLAG),
+	IPSET_TYPE_IFACE_FLAG = 5,
+	IPSET_TYPE_IFACE = (1 << IPSET_TYPE_IFACE_FLAG),
 	/* Strictly speaking not a feature, but a flag for dumping:
 	 * this settype must be dumped last */
 	IPSET_DUMP_LAST_FLAG = 7,

include/linux/netfilter/ipset/ip_set_ahash.h

@@ -63,6 +63,9 @@ struct ip_set_hash {
 #ifdef IP_SET_HASH_WITH_NETMASK
 	u8 netmask;		/* netmask value for subnets to store */
 #endif
+#ifdef IP_SET_HASH_WITH_RBTREE
+	struct rb_root rbtree;
+#endif
 #ifdef IP_SET_HASH_WITH_NETS
 	struct ip_set_hash_nets nets[0]; /* book-keeping of prefixes */
 #endif
@@ -200,6 +203,9 @@ ip_set_hash_destroy(struct ip_set *set)
 		del_timer_sync(&h->gc);
 
 	ahash_destroy(h->table);
+#ifdef IP_SET_HASH_WITH_RBTREE
+	rbtree_destroy(&h->rbtree);
+#endif
 	kfree(h);
 
 	set->data = NULL;

net/netfilter/ipset/Kconfig

@@ -109,6 +109,16 @@ config IP_SET_HASH_NETPORT
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+config IP_SET_HASH_NETIFACE
+	tristate "hash:net,iface set support"
+	depends on IP_SET
+	help
+	  This option adds the hash:net,iface set type support, by which
+	  one can store IPv4/IPv6 network address/prefix and
+	  interface name pairs as elements in a set.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
 config IP_SET_LIST_SET
 	tristate "list:set set support"
 	depends on IP_SET

net/netfilter/ipset/Makefile

@@ -19,6 +19,7 @@ obj-$(CONFIG_IP_SET_HASH_IPPORTIP) += ip_set_hash_ipportip.o
 obj-$(CONFIG_IP_SET_HASH_IPPORTNET) += ip_set_hash_ipportnet.o
 obj-$(CONFIG_IP_SET_HASH_NET) += ip_set_hash_net.o
 obj-$(CONFIG_IP_SET_HASH_NETPORT) += ip_set_hash_netport.o
+obj-$(CONFIG_IP_SET_HASH_NETIFACE) += ip_set_hash_netiface.o
 
 # list types
 obj-$(CONFIG_IP_SET_LIST_SET) += ip_set_list_set.o