L2TP_ATTR_PEER_SESSION_ID
if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id) ||
[L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },