--- zzzz-none-000/linux-4.4.271/net/l2tp/l2tp_core.h	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/net/l2tp/l2tp_core.h	2023-04-19 10:22:30.000000000 +0000
@@ -252,6 +252,8 @@
 						bool do_ref);
 struct l2tp_tunnel *l2tp_tunnel_find(const struct net *net, u32 tunnel_id);
 struct l2tp_tunnel *l2tp_tunnel_find_nth(const struct net *net, int nth);
+void l2tp_stats_update(struct l2tp_tunnel *tunnel, struct l2tp_session *session,
+		       struct l2tp_stats *stats);
 
 int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id,
 		       u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg,