Update internal/gatewayapi/listener.go

Co-authored-by: Isaac Wilson <isaac.wilson514@gmail.com>
Signed-off-by: zirain <zirain2009@gmail.com>

Author: zirain

internal/gatewayapi/listener.go

@@ -263,11 +263,7 @@ func (t *Translator) validateListenerSpec(listener *ListenerContext, resources *
 	specValid := t.validateAllowedNamespaces(listener)
 
 	// Phase 2: Validate allowed routes based on protocol
-	if listener.Protocol == gwapiv1.HTTPProtocolType ||
-		listener.Protocol == gwapiv1.HTTPSProtocolType ||
-		listener.Protocol == gwapiv1.TCPProtocolType ||
-		listener.Protocol == gwapiv1.UDPProtocolType ||
-		listener.Protocol == gwapiv1.TLSProtocolType {
+	if isSupportedListenerProtocol(listener.Protocol) {
 		var tlsMode *gwapiv1.TLSModeType
 		if listener.TLS != nil {
 			tlsMode = listener.TLS.Mode