arp.h: add some ARPHRD definition
*/
#define ARPHRD_ETHER 1 /* Ethernet */
+#define ARPHRD_PPP 512
+#define ARPHRD_LOOPBACK 772 /* Loopback device */
#define ARPHRD_IEEE80211 801 /* IEEE 802.11 */
#define ARPHRD_IEEE802154 804 /* IEEE 802.15.4 */
+#define ARPHRD_VOID 0xFFFF /* Void type, nothing is known */
+#define ARPHRD_NONE 0xFFFE /* zero header length */
+
/* Three ioctls are available on all PF_INET sockets. Each ioctl takes a
* pointer to a 'struct arpreq' as its parameter.
*/
