IPV6_EXTRACT_PREF
} else if (rt && IPV6_EXTRACT_PREF(rt->fib6_flags) != pref) {
if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags)))
m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2;