NETLBL_CATMAP_BIT
while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
bitmask = NETLBL_CATMAP_BIT << bit;
bitmask = NETLBL_CATMAP_BIT;
iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);