@@ -17,4 +17,5 @@ ovpn-y += netlink-gen.o
 ovpn-y += peer.o
 ovpn-y += pktid.o
 ovpn-y += socket.o
+ovpn-y += stats.o
 ovpn-y += udp.o

@@ -10,6 +10,7 @@
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
 #include <net/gso.h>
+#include <net/ip.h>
 
 #include "ovpnstruct.h"
 #include "io.h"

@@ -19,6 +20,7 @@
 #include "crypto_aead.h"
 #include "netlink.h"
 #include "proto.h"
+#include "socket.h"
 #include "udp.h"
 
 int ovpn_struct_init(struct net_device *dev)

@@ -163,6 +165,8 @@ static int ovpn_decrypt_one(struct ovpn_peer *peer, struct sk_buff *skb)
 	int ret = -1;
 	u8 key_id;
 
+	ovpn_peer_stats_increment_rx(&peer->link_stats, skb->len);
+
 	/* get the key slot matching the key Id in the received packet */
 	key_id = ovpn_key_id_from_skb(skb);
 	ks = ovpn_crypto_key_id_to_slot(&peer->crypto, key_id);

@@ -184,6 +188,9 @@ static int ovpn_decrypt_one(struct ovpn_peer *peer, struct sk_buff *skb)
 		goto drop;
 	}
 
+	/* increment RX stats */
+	ovpn_peer_stats_increment_rx(&peer->vpn_stats, skb->len);
+
 	/* check if this is a valid datapacket that has to be delivered to the
 	 * tun interface
 	 */

@@ -278,6 +285,8 @@ static bool ovpn_encrypt_one(struct ovpn_peer *peer, struct sk_buff *skb)
 		goto err;
 	}
 
+	ovpn_peer_stats_increment_tx(&peer->vpn_stats, skb->len);
+
 	/* encrypt */
 	ret = ovpn_aead_encrypt(ks, skb, peer->id);
 	if (unlikely(ret < 0)) {

@@ -289,6 +298,7 @@ static bool ovpn_encrypt_one(struct ovpn_peer *peer, struct sk_buff *skb)
 
 	success = true;
 
+	ovpn_peer_stats_increment_tx(&peer->link_stats, skb->len);
 err:
 	ovpn_crypto_key_slot_put(ks);
 	return success;

@@ -20,6 +20,7 @@
 #include "main.h"
 #include "netlink.h"
 #include "peer.h"
+#include "socket.h"
 
 struct ovpn_peer *ovpn_peer_new(struct ovpn_struct *ovpn, u32 id)
 {

@@ -42,6 +43,8 @@ struct ovpn_peer *ovpn_peer_new(struct ovpn_struct *ovpn, u32 id)
 	ovpn_crypto_state_init(&peer->crypto);
 	spin_lock_init(&peer->lock);
 	kref_init(&peer->refcount);
+	ovpn_peer_stats_init(&peer->vpn_stats);
+	ovpn_peer_stats_init(&peer->link_stats);
 
 	INIT_WORK(&peer->encrypt_work, ovpn_encrypt_work);
 	INIT_WORK(&peer->decrypt_work, ovpn_decrypt_work);

@@ -10,14 +10,15 @@
 #ifndef _NET_OVPN_OVPNPEER_H_
 #define _NET_OVPN_OVPNPEER_H_
 
+#include <linux/ptr_ring.h>
+#include <net/dst_cache.h>
+#include <uapi/linux/ovpn.h>
+
 #include "bind.h"
 #include "pktid.h"
 #include "crypto.h"
 #include "socket.h"
-
-#include <linux/ptr_ring.h>
-#include <net/dst_cache.h>
-#include <uapi/linux/ovpn.h>
+#include "stats.h"
 
 /**
  * struct ovpn_peer - the main remote peer object

@@ -36,6 +37,8 @@
  * @dst_cache: cache for dst_entry used to send to peer
  * @bind: remote peer binding
  * @halt: true if ovpn_peer_mark_delete was called
+ * @vpn_stats: per-peer in-VPN TX/RX stays
+ * @link_stats: per-peer link/transport TX/RX stats
  * @delete_reason: why peer was deleted (i.e. timeout, transport error, ..)
  * @lock: protects binding to peer (bind)
  * @refcount: reference counter

@@ -60,6 +63,8 @@ struct ovpn_peer {
 	struct dst_cache dst_cache;
 	struct ovpn_bind __rcu *bind;
 	bool halt;
+	struct ovpn_peer_stats vpn_stats;
+	struct ovpn_peer_stats link_stats;
 	enum ovpn_del_peer_reason delete_reason;
 	spinlock_t lock; /* protects bind */
 	struct kref refcount;

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+/*  OpenVPN data channel offload
+ *
+ *  Copyright (C) 2020-2024 OpenVPN, Inc.
+ *
+ *  Author:	James Yonan <james@openvpn.net>
+ *		Antonio Quartulli <antonio@openvpn.net>
+ */
+
+#include <linux/atomic.h>
+
+#include "stats.h"
+
+void ovpn_peer_stats_init(struct ovpn_peer_stats *ps)
+{
+	atomic64_set(&ps->rx.bytes, 0);
+	atomic_set(&ps->rx.packets, 0);
+
+	atomic64_set(&ps->tx.bytes, 0);
+	atomic_set(&ps->tx.packets, 0);
+}

@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*  OpenVPN data channel offload
+ *
+ *  Copyright (C) 2020-2024 OpenVPN, Inc.
+ *
+ *  Author:	James Yonan <james@openvpn.net>
+ *		Antonio Quartulli <antonio@openvpn.net>
+ *		Lev Stipakov <lev@openvpn.net>
+ */
+
+#ifndef _NET_OVPN_OVPNSTATS_H_
+#define _NET_OVPN_OVPNSTATS_H_
+
+//#include <linux/atomic.h>
+//#include <linux/jiffies.h>
+
+/* per-peer stats, measured on transport layer */
+
+/* one stat */
+struct ovpn_peer_stat {
+	atomic64_t bytes;
+	atomic_t packets;
+};
+
+/* rx and tx stats, enabled by notify_per != 0 or period != 0 */
+struct ovpn_peer_stats {
+	struct ovpn_peer_stat rx;
+	struct ovpn_peer_stat tx;
+};
+
+void ovpn_peer_stats_init(struct ovpn_peer_stats *ps);
+
+static inline void ovpn_peer_stats_increment(struct ovpn_peer_stat *stat,
+					     const unsigned int n)
+{
+	atomic64_add(n, &stat->bytes);
+	atomic_inc(&stat->packets);
+}
+
+static inline void ovpn_peer_stats_increment_rx(struct ovpn_peer_stats *stats,
+						const unsigned int n)
+{
+	ovpn_peer_stats_increment(&stats->rx, n);
+}
+
+static inline void ovpn_peer_stats_increment_tx(struct ovpn_peer_stats *stats,
+						const unsigned int n)
+{
+	ovpn_peer_stats_increment(&stats->tx, n);
+}
+
+#endif /* _NET_OVPN_OVPNSTATS_H_ */