LWT_XFRM_IF_ID
info->if_id = nla_get_u32(tb[LWT_XFRM_IF_ID]);
if (nla_put_u32(skb, LWT_XFRM_IF_ID, info->if_id) ||
[LWT_XFRM_IF_ID] = NLA_POLICY_MIN(NLA_U32, 1),
if (!tb[LWT_XFRM_IF_ID]) {