IFLA_NEW_IFINDEX
nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
[IFLA_NEW_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 1),
new_ifindex = nla_get_s32_default(tb[IFLA_NEW_IFINDEX], 0);