Pass sockets to bypass to kernel interface, allowing us to register them dynamically

src/charon/kernel/kernel_interface.h

@@ -332,6 +332,15 @@ struct kernel_interface_t {
 	status_t (*del_route) (kernel_interface_t *this, chunk_t dst_net, u_int8_t prefixlen,
 								host_t *gateway, host_t *src_ip, char *if_name);
 
+	/**
+	 * Set up a bypass policy for a given socket.
+	 *
+	 * @param fd			socket file descriptor to setup policy for
+	 * @param family		protocol family of the socket
+	 * @return				TRUE of policy set up successfully
+	 */
+	bool (*bypass_socket)(kernel_interface_t *this, int fd, int family);
+
 	/**
 	 * manager methods
 	 */