DEFINE_TRIVIAL_DESTRUCTOR(link_netlink_destroy_callback, Link, link_unref);
int link_get(Manager *m, int ifindex, Link **ret);
+int link_get_by_name(Manager *m, const char *ifname, Link **ret);
int link_up(Link *link);
int link_down(Link *link, link_netlink_message_handler_t callback);