L2TP_ATTR_UDP_CSUM
cfg->use_udp_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_CSUM]);
if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx) ||
[L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },