+void interface_ip_set_prefix_assignment(struct device_prefix *prefix,
+ struct interface *iface, uint8_t length);
+void interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
+ uint8_t length, time_t valid_until, time_t preferred_until);
+void interface_ip_set_ula_prefix(const char *prefix);
+