HOST_ISUP
if (HOST_ISUP(st.up)) {
} else if (HOST_ISUP(host->up)) {
hdr.rtm_type = HOST_ISUP(crt->up) ? RTM_ADD : RTM_DELETE;
HOST_ISUP(crt->up) ? "added" : "deleted");
HOST_ISUP(crt->up) ? "add" : "delete", gwname,
HOST_ISUP(host->up) ? "up" : "down",