L2TP_ATTR_PEER_CONN_ID
if (!attrs[L2TP_ATTR_PEER_CONN_ID]) {
peer_tunnel_id = nla_get_u32(attrs[L2TP_ATTR_PEER_CONN_ID]);
nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
[L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },