inet_ifa_byprefix
struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
prim = inet_ifa_byprefix(in_dev, prefix, mask);
prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
prim1 = inet_ifa_byprefix(in_dev,