dissectors: ethernet: Don't resolve OUI for locally administered addr…

…esses

Locally administered addresses do not contain an OUI, thus do not try to
resolve it. Instead show "Locally Administered" as the vendor string.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

proto_ethernet.c

@@ -25,13 +25,20 @@ static inline bool is_broadcast_ether_addr(const uint8_t *mac)
 	return (mac[0] & mac[1] & mac[2] & mac[3] & mac[4] & mac[5]) == 0xff;
 }
 
+static inline bool is_local_ether_addr(const u8 *mac)
+{
+	return 0x02 & mac[0];
+}
+
 static const char *ether_lookup_addr(const uint8_t *mac)
 {
 	if (is_multicast_ether_addr(mac)) {
 		if (is_broadcast_ether_addr(mac))
 			return "Broadcast";
 		else
 			return "Multicast";
+	} else if (is_local_ether_addr(mac)) {
+		return "Locally Administered";
 	}
 
 	/* found no matching address, so look up the vendor from OUI */