Add ntp protocol sniffing

route/route.go

@@ -569,6 +569,7 @@ func (r *Router) actionSniff(
 				sniff.UTP,
 				sniff.UDPTracker,
 				sniff.DTLSRecord,
+				sniff.NTP,
 			}
 		}
 		for {

route/rule/rule_action.go

@@ -389,6 +389,8 @@ func (r *RuleActionSniff) build() error {
 			r.StreamSniffers = append(r.StreamSniffers, sniff.SSH)
 		case C.ProtocolRDP:
 			r.StreamSniffers = append(r.StreamSniffers, sniff.RDP)
+		case C.ProtocolNTP:
+			r.PacketSniffers = append(r.PacketSniffers, sniff.NTP)
 		default:
 			return E.New("unknown sniffer: ", name)
 		}