cmd/ndp: ensure interface has multicast

Signed-off-by: Matt Layher <mdlayher@gmail.com>
mdlayher · Mar 4, 2022 · de594d7 · de594d7
1 parent 2a2b53c
commit de594d7
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/cmd/ndp/main.go b/cmd/ndp/main.go
@@ -115,8 +115,10 @@ func findInterface(name string) (*net.Interface, error) {
 	}
 
 	for _, ifi := range ifis {
-		// Is the interface up and not a loopback?
-		if ifi.Flags&net.FlagUp != 1 || ifi.Flags&net.FlagLoopback != 0 {
+		// Is the interface up, multicast, and not a loopback?
+		if ifi.Flags&net.FlagUp == 0 ||
+			ifi.Flags&net.FlagMulticast == 0 ||
+			ifi.Flags&net.FlagLoopback != 0 {
 			continue
 		}