--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -398,6 +398,31 @@ err_tlock:
 }
 EXPORT_SYMBOL_GPL(l2tp_session_register);
 
+void l2tp_stats_update(struct l2tp_tunnel *tunnel,
+                       struct l2tp_session *session,
+                       struct l2tp_stats *stats)
+{
+        atomic_long_add(atomic_long_read(&stats->rx_packets),
+                        &tunnel->stats.rx_packets);
+        atomic_long_add(atomic_long_read(&stats->rx_bytes),
+                        &tunnel->stats.rx_bytes);
+        atomic_long_add(atomic_long_read(&stats->tx_packets),
+                        &tunnel->stats.tx_packets);
+        atomic_long_add(atomic_long_read(&stats->tx_bytes),
+                        &tunnel->stats.tx_bytes);
+
+        atomic_long_add(atomic_long_read(&stats->rx_packets),
+                        &session->stats.rx_packets);
+        atomic_long_add(atomic_long_read(&stats->rx_bytes),
+                        &session->stats.rx_bytes);
+        atomic_long_add(atomic_long_read(&stats->tx_packets),
+                        &session->stats.tx_packets);
+        atomic_long_add(atomic_long_read(&stats->tx_bytes),
+                        &session->stats.tx_bytes);
+}
+EXPORT_SYMBOL_GPL(l2tp_stats_update);
+
+
 /*****************************************************************************
  * Receive data handling
  *****************************************************************************/
--- a/net/l2tp/l2tp_core.h
+++ b/net/l2tp/l2tp_core.h
@@ -232,6 +232,9 @@ struct l2tp_session *l2tp_session_get_nt
 struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net,
 						const char *ifname);
 
+void l2tp_stats_update(struct l2tp_tunnel *tunnel, struct l2tp_session *session,
+                       struct l2tp_stats *stats);
+
 /* Tunnel and session lifetime management.
  * Creation of a new instance is a two-step process: create, then register.
  * Destruction is triggered using the *_delete functions, and completes asynchronously.