Introduce constant MAC_BROADCAST

Signed-off-by: Volker Diels-Grabsch <v@njh.eu>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

2 files changed, 3 insertions, 1 deletions

diff --git a/tap.c b/tap.c
index cf862ef..50e1a88 100644
--- a/tap.c
+++ b/tap.c
@@ -1511,7 +1511,7 @@ void tap_backend_init(struct ctx *c)
 		 * sends us packets.  Use the broadcast address so that our
 		 * first packets will reach it.
 		 */
-		memset(&c->guest_mac, 0xff, sizeof(c->guest_mac));
+		memcpy(&c->guest_mac, MAC_BROADCAST, sizeof(c->guest_mac));
 		break;
 	}
 
diff --git a/util.h b/util.h
index 2a8c38f..22eaac5 100644
--- a/util.h
+++ b/util.h
@@ -97,6 +97,8 @@ void abort_with_msg(const char *fmt, ...)
 #define FD_PROTO(x, proto)						\
 	(IN_INTERVAL(c->proto.fd_min, c->proto.fd_max, (x)))
 
+#define MAC_BROADCAST							\
+	((uint8_t [ETH_ALEN]){ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff })
 #define MAC_ZERO		((uint8_t [ETH_ALEN]){ 0 })
 #define MAC_IS_ZERO(addr)	(!memcmp((addr), MAC_ZERO, ETH_ALEN))