#define ARPHRD_IEEE80211_PRISM 802 /* IEEE 802.11 + Prism2 header */
#define ARPHRD_VOID 0xFFFF /* Void type, nothing is known */
+#define ARPHRD_NONE 0xFFFE /* zero header length */
/* ARP protocol opcodes. */
#define ARPOP_REQUEST 1 /* ARP request */