Add userspace flow implementation (#3393)

client/internal/netflow/types/types.go

@@ -7,17 +7,52 @@ import (
 	"github.com/google/uuid"
 )
 
+type Protocol uint8
+
+const (
+	ProtocolUnknown = 0
+	ICMP            = 1
+	TCP             = 6
+	UDP             = 17
+)
+
+func (p Protocol) String() string {
+	switch p {
+	case 1:
+		return "ICMP"
+	case 6:
+		return "TCP"
+	case 17:
+		return "UDP"
+	default:
+		return "unknown"
+	}
+}
+
 type Type int
 
 const (
-	TypeStart = iota
+	TypeUnknown = iota
+	TypeStart
 	TypeEnd
 )
 
 type Direction int
 
+func (d Direction) String() string {
+	switch d {
+	case Ingress:
+		return "ingress"
+	case Egress:
+		return "egress"
+	default:
+		return "unknown"
+	}
+}
+
 const (
-	Ingress = iota
+	DirectionUnknown = iota
+	Ingress
 	Egress
 )