added in linux commit 4fe0de5b143762d327bfaf1d7be7c5b58041a18c
@@ -56,6 +56,7 @@
#define ETH_P_8021AD 0x88A8
#define ETH_P_802_EX1 0x88B5
#define ETH_P_ERSPAN 0x88BE
+#define ETH_P_PREAUTH 0x88C7
#define ETH_P_TIPC 0x88CA
#define ETH_P_MACSEC 0x88E5
#define ETH_P_8021AH 0x88E7