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);
 };
 
 /**

src/libcharon/network/socket_manager.c

@@ -102,6 +102,19 @@ METHOD(socket_manager_t, get_port, u_int16_t,
 	return port;
 }
 
+METHOD(socket_manager_t, supported_families, socket_family_t,
+	private_socket_manager_t *this)
+{
+	socket_family_t families = SOCKET_FAMILY_NONE;
+	this->lock->read_lock(this->lock);
+	if (this->socket)
+	{
+		families = this->socket->supported_families(this->socket);
+	}
+	this->lock->unlock(this->lock);
+	return families;
+}
+
 static void create_socket(private_socket_manager_t *this)
 {
 	socket_constructor_t create;
@@ -167,6 +180,7 @@ socket_manager_t *socket_manager_create()
 			.send = _sender,
 			.receive = _receiver,
 			.get_port = _get_port,
+			.supported_families = _supported_families,
 			.add_socket = _add_socket,
 			.remove_socket = _remove_socket,
 			.destroy = _destroy,

src/libcharon/network/socket_manager.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010-2012 Tobias Brunner
+ * Copyright (C) 2010-2013 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  * Copyright (C) 2010 Martin Willi
  * Copyright (C) 2010 revosec AG
@@ -40,7 +40,7 @@ struct socket_manager_t {
 	 *						- SUCCESS when packet successfully received
 	 *						- FAILED when unable to receive
 	 */
-	status_t (*receive) (socket_manager_t *this, packet_t **packet);
+	status_t (*receive)(socket_manager_t *this, packet_t **packet);
 
 	/**
 	 * Send a packet using the registered socket.
@@ -50,7 +50,7 @@ struct socket_manager_t {
 	 *						- SUCCESS when packet successfully sent
 	 *						- FAILED when unable to send
 	 */
-	status_t (*send) (socket_manager_t *this, packet_t *packet);
+	status_t (*send)(socket_manager_t *this, packet_t *packet);
 
 	/**
 	 * Get the port the registered socket is listening on.
@@ -58,7 +58,14 @@ struct socket_manager_t {
 	 * @param nat_t			TRUE to get the port used to float in case of NAT-T
 	 * @return				the port, or 0, if no socket is registered
 	 */
-	u_int16_t (*get_port) (socket_manager_t *this, bool nat_t);
+	u_int16_t (*get_port)(socket_manager_t *this, bool nat_t);
+
+	/**
+	 * Get the address families the registered socket is listening on.
+	 *
+	 * @return				address families
+	 */
+	socket_family_t (*supported_families)(socket_manager_t *this);
 
 	/**
 	 * Register a socket constructor.

src/libcharon/plugins/socket_default/socket_default_socket.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2006-2012 Tobias Brunner
+ * Copyright (C) 2006-2013 Tobias Brunner
  * Copyright (C) 2006 Daniel Roethlisberger
  * Copyright (C) 2005-2010 Martin Willi
  * Copyright (C) 2005 Jan Hutter
@@ -501,6 +501,22 @@ METHOD(socket_t, get_port, u_int16_t,
 	return nat_t ? this->natt : this->port;
 }
 
+METHOD(socket_t, supported_families, socket_family_t,
+	private_socket_default_socket_t *this)
+{
+	socket_family_t families = SOCKET_FAMILY_NONE;
+
+	if (this->ipv4 != -1 || this->ipv4_natt != -1)
+	{
+		families |= SOCKET_FAMILY_IPV4;
+	}
+	if (this->ipv6 != -1 || this->ipv6_natt != -1)
+	{
+		families |= SOCKET_FAMILY_IPV6;
+	}
+	return families;
+}
+
 /**
  * open a socket to send and receive packets
  */
@@ -671,6 +687,7 @@ socket_default_socket_t *socket_default_socket_create()
 				.send = _sender,
 				.receive = _receiver,
 				.get_port = _get_port,
+				.supported_families = _supported_families,
 				.destroy = _destroy,
 			},
 		},

src/libcharon/plugins/socket_dynamic/socket_dynamic_socket.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2006-2012 Tobias Brunner
+ * Copyright (C) 2006-2013 Tobias Brunner
  * Copyright (C) 2006 Daniel Roethlisberger
  * Copyright (C) 2005-2010 Martin Willi
  * Copyright (C) 2005 Jan Hutter
@@ -620,6 +620,14 @@ METHOD(socket_t, get_port, u_int16_t,
 	return 0;
 }
 
+METHOD(socket_t, supported_families, socket_family_t,
+	private_socket_dynamic_socket_t *this)
+{
+	/* we could return only the families of the opened sockets, but it could
+	 * be that both families are supported even if no socket is yet open */
+	return SOCKET_FAMILY_BOTH;
+}
+
 METHOD(socket_t, destroy, void,
 	private_socket_dynamic_socket_t *this)
 {
@@ -654,6 +662,7 @@ socket_dynamic_socket_t *socket_dynamic_socket_create()
 				.send = _sender,
 				.receive = _receiver,
 				.get_port = _get_port,
+				.supported_families = _supported_families,
 				.destroy = _destroy,
 			},
 		},