+void interface_init(struct interface *iface, const char *name,
+ struct blob_attr *config);
+
+void interface_add(struct interface *iface, struct blob_attr *config);
+
+void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state);
+
+void interface_set_available(struct interface *iface, bool new_state);
+int interface_set_up(struct interface *iface);
+int interface_set_down(struct interface *iface);
+
+void interface_add_user(struct interface_user *dep, struct interface *iface);
+void interface_remove_user(struct interface_user *dep);