IFF_LOWER_UP 57 include/linux/if.h IFF_MASTER|IFF_SLAVE|IFF_RUNNING|IFF_LOWER_UP|IFF_DORMANT) IFF_LOWER_UP 3353 net/core/dev.c IFF_LOWER_UP | IFF_LOWER_UP 3362 net/core/dev.c flags |= IFF_LOWER_UP;