Random Ethernet addresses should be private and should not be multicast.
authorBen Pfaff <blp@nicira.com>
Mon, 6 Oct 2008 16:37:42 +0000 (09:37 -0700)
committerBen Pfaff <blp@nicira.com>
Mon, 6 Oct 2008 16:44:45 +0000 (09:44 -0700)
include/packets.h

index e7681ad436a864329a7966ea015bfe812127b3e1..bad36712d3fb96af550e156a65bfd2c3d7cd99b6 100644 (file)
@@ -86,6 +86,8 @@ static inline void eth_addr_from_uint64(uint64_t x, uint8_t ea[ETH_ADDR_LEN])
 static inline void eth_addr_random(uint8_t ea[ETH_ADDR_LEN])
 {
     random_bytes(ea, ETH_ADDR_LEN);
+    ea[0] &= ~1;                /* Unicast. */
+    ea[0] |= 2;                 /* Private. */
 }
 
 #define ETH_ADDR_FMT                                                    \