Restructurisations, cleanups and few bugfixes

include/grub/net/udp.h

@@ -11,6 +11,22 @@ struct udphdr
   grub_uint16_t chksum;
 } __attribute__ ((packed));
 
+
+grub_net_socket_t
+grub_net_udp_open (char *server,
+		   grub_uint16_t out_port,
+		   grub_err_t (*recv_hook) (grub_net_socket_t sock,
+					    struct grub_net_buff *nb,
+					    void *data),
+		   void *recv_hook_data);
+
+static inline void
+grub_net_udp_close (grub_net_socket_t sock)
+{
+  grub_net_socket_unregister (sock);
+  grub_free (sock);
+}
+
 grub_err_t
 grub_net_send_udp_packet (const grub_net_socket_t socket , struct grub_net_buff *nb);