Made IP address enumeration more flexible

Also added an option to enumerate addresses on ignored interfaces.

src/libhydra/kernel/kernel_net.h

@@ -23,11 +23,30 @@
 #define KERNEL_NET_H_
 
 typedef struct kernel_net_t kernel_net_t;
+typedef enum kernel_address_type_t kernel_address_type_t;
 
 #include <utils/enumerator.h>
 #include <utils/host.h>
 #include <plugins/plugin.h>
 
+/**
+ * Type of addresses (e.g. when enumerating them)
+ */
+enum kernel_address_type_t {
+	/** normal addresses (on regular, up, non-ignored) interfaces */
+	ADDR_TYPE_REGULAR = 0,
+	/** addresses on down interfaces */
+	ADDR_TYPE_DOWN =  (1 << 0),
+	/** addresses on ignored interfaces */
+	ADDR_TYPE_IGNORED = (1 << 1),
+	/** addresses on loopback interfaces */
+	ADDR_TYPE_LOOPBACK = (1 << 2),
+	/** virtual IP addresses */
+	ADDR_TYPE_VIRTUAL = (1 << 3),
+	/** to enumerate all available addresses */
+	ADDR_TYPE_ALL = (1 << 4) - 1,
+};
+
 /**
  * Interface to the network subsystem of the kernel.
  *
@@ -81,14 +100,11 @@ struct kernel_net_t {
 	 * enumerator gets destroyed.
 	 * The hosts are read-only, do not modify of free.
 	 *
-	 * @param include_down_ifaces	TRUE to enumerate addresses from down interfaces
-	 * @param include_virtual_ips	TRUE to enumerate virtual IP addresses
-	 * @param include_loopback		TRUE to enumerate addresses on loopback interfaces
-	 * @return						enumerator over host_t's
+	 * @param which			a combination of address types to enumerate
+	 * @return				enumerator over host_t's
 	 */
 	enumerator_t *(*create_address_enumerator) (kernel_net_t *this,
-							bool include_down_ifaces, bool include_virtual_ips,
-							bool include_loopback);
+												kernel_address_type_t which);
 
 	/**
 	 * Add a virtual IP to an interface.