l2tp_v2_session_get
session = l2tp_v2_session_get(net, tunnel_id, session_id);
EXPORT_SYMBOL_GPL(l2tp_v2_session_get);
return l2tp_v2_session_get(net, tunnel_id, session_id);
struct l2tp_session *l2tp_v2_session_get(const struct net *net, u16 tunnel_id, u16 session_id);