+#include <stdbool.h>
+
+/* Degree of dummy support.
+ *
+ * Beyond enabling support for dummies, it can be useful to replace some kinds
+ * of bridges and netdevs, or all kinds, by dummies. This enum expresses the
+ * degree to which this should happen. */
+enum dummy_level {
+ DUMMY_OVERRIDE_NONE, /* Support dummy but don't force its use. */
+ DUMMY_OVERRIDE_SYSTEM, /* Replace "system" by dummy. */
+ DUMMY_OVERRIDE_ALL, /* Replace all types by dummy. */
+};
+