net: Socket implementations report the address families they support

src/libcharon/network/socket.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2006-2012 Tobias Brunner
+ * Copyright (C) 2006-2013 Tobias Brunner
  * Copyright (C) 2005-2010 Martin Willi
  * Copyright (C) 2006 Daniel Roethlisberger
  * Copyright (C) 2005 Jan Hutter
@@ -25,6 +25,7 @@
 #define SOCKET_H_
 
 typedef struct socket_t socket_t;
+typedef enum socket_family_t socket_family_t;
 
 #include <library.h>
 #include <networking/packet.h>
@@ -36,6 +37,31 @@ typedef struct socket_t socket_t;
  */
 typedef socket_t *(*socket_constructor_t)();
 
+/**
+ * Address families supported by socket implementations.
+ */
+enum socket_family_t {
+	/**
+	 * No address families supported
+	 */
+	SOCKET_FAMILY_NONE = 0,
+
+	/**
+	 * IPv4
+	 */
+	SOCKET_FAMILY_IPV4 = (1 << 0),
+
+	/**
+	 * IPv6
+	 */
+	SOCKET_FAMILY_IPV6 = (1 << 1),
+
+	/**
+	 * Both address families supported
+	 */
+	SOCKET_FAMILY_BOTH = (1 << 2) - 1,
+};
+
 /**
  * Socket interface definition.
  */
@@ -52,7 +78,7 @@ struct socket_t {
 	 *						- SUCCESS when packet successfully received
 	 *						- FAILED when unable to receive
 	 */
-	status_t (*receive) (socket_t *this, packet_t **packet);
+	status_t (*receive)(socket_t *this, packet_t **packet);
 
 	/**
 	 * Send a packet.
@@ -65,7 +91,7 @@ struct socket_t {
 	 *						- SUCCESS when packet successfully sent
 	 *						- FAILED when unable to send
 	 */
-	status_t (*send) (socket_t *this, packet_t *packet);
+	status_t (*send)(socket_t *this, packet_t *packet);
 
 	/**
 	 * Get the port this socket is listening on.
@@ -73,12 +99,19 @@ struct socket_t {
 	 * @param nat_t			TRUE to get the port used to float in case of NAT-T
 	 * @return				the port
 	 */
-	u_int16_t (*get_port) (socket_t *this, bool nat_t);
+	u_int16_t (*get_port)(socket_t *this, bool nat_t);
+
+	/**
+	 * Get the address families this socket is listening on.
+	 *
+	 * @return				supported families
+	 */
+	socket_family_t (*supported_families)(socket_t *this);
 
 	/**
 	 * Destroy a socket implementation.
 	 */
-	void (*destroy) (socket_t *this);
+	void (*destroy)(socket_t *this);
 };
 
 /**