unregister_inet6addr_validator_notifier
unregister_inet6addr_validator_notifier(&router->inet6addr_valid_nb);
unregister_inet6addr_validator_notifier(&router->inet6addr_valid_nb);
unregister_inet6addr_validator_notifier(
unregister_inet6addr_validator_notifier(
int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
EXPORT_SYMBOL(unregister_inet6addr_validator_notifier);