Some code reorg

cmd/struct.go

@@ -9,6 +9,12 @@ const (
 	IPv6 = 1
 )
 
+type NatDesc struct {
+	Proto    string
+	JailPort string
+	HostPort string
+}
+
 // To allow sorting, just duplicate fields in JailSort below
 type Jail struct {
 	Name          string