@@ -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

@@ -139,6 +139,7 @@ int ovpn_aead_encrypt(struct ovpn_peer *peer, struct ovpn_crypto_key_slot *ks,
 	aead_request_set_crypt(req, sg, sg, skb->len - head_size, iv);
 	aead_request_set_ad(req, OVPN_OP_SIZE_V2 + NONCE_WIRE_SIZE);
 
+	ovpn_skb_cb(skb)->ctx->orig_len = skb->len;
 	ovpn_skb_cb(skb)->ctx->peer = peer;
 	ovpn_skb_cb(skb)->ctx->req = req;
 	ovpn_skb_cb(skb)->ctx->ks = ks;

@@ -236,6 +237,7 @@ int ovpn_aead_decrypt(struct ovpn_peer *peer, struct ovpn_crypto_key_slot *ks,
 
 	aead_request_set_ad(req, NONCE_WIRE_SIZE + OVPN_OP_SIZE_V2);
 
+	ovpn_skb_cb(skb)->ctx->orig_len = skb->len;
 	ovpn_skb_cb(skb)->ctx->payload_offset = payload_offset;
 	ovpn_skb_cb(skb)->ctx->peer = peer;
 	ovpn_skb_cb(skb)->ctx->req = req;

@@ -11,6 +11,7 @@
 #include <linux/skbuff.h>
 #include <net/gro_cells.h>
 #include <net/gso.h>
+#include <net/ip.h>
 
 #include "ovpnstruct.h"
 #include "peer.h"

@@ -19,6 +20,7 @@
 #include "crypto_aead.h"
 #include "netlink.h"
 #include "proto.h"
+#include "socket.h"
 #include "udp.h"
 #include "skb.h"
 

@@ -120,6 +122,11 @@ void ovpn_decrypt_post(struct sk_buff *skb, int ret)
 		goto drop;
 	}
 
+	/* increment RX stats */
+	ovpn_peer_stats_increment_rx(&peer->vpn_stats, skb->len);
+	ovpn_peer_stats_increment_rx(&peer->link_stats,
+				     ovpn_skb_cb(skb)->ctx->orig_len);
+
 	kfree(ovpn_skb_cb(skb)->ctx);
 	ovpn_netdev_write(peer, skb);
 	/* skb is passed to upper layer - don't free it */

@@ -169,6 +176,9 @@ void ovpn_encrypt_post(struct sk_buff *skb, int ret)
 		goto err;
 
 	skb_mark_not_on_list(skb);
+	ovpn_peer_stats_increment_tx(&peer->link_stats, skb->len);
+	ovpn_peer_stats_increment_tx(&peer->vpn_stats,
+				     ovpn_skb_cb(skb)->ctx->orig_len);
 
 	kfree(ovpn_skb_cb(skb)->ctx);
 

@@ -18,6 +18,7 @@
 #include "main.h"
 #include "netlink.h"
 #include "peer.h"
+#include "socket.h"
 
 /**
  * ovpn_peer_new - allocate and initialize a new peer object

@@ -47,6 +48,8 @@ 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);
 
 	ret = dst_cache_init(&peer->dst_cache, GFP_KERNEL);
 	if (ret < 0) {

@@ -10,10 +10,14 @@
 #ifndef _NET_OVPN_OVPNPEER_H_
 #define _NET_OVPN_OVPNPEER_H_
 
+#include <net/dst_cache.h>
+#include <uapi/linux/ovpn.h>
+
 #include "bind.h"
 #include "pktid.h"
 #include "crypto.h"
 #include "socket.h"
+#include "stats.h"
 
 #include <net/dst_cache.h>
 #include <uapi/linux/ovpn.h>

@@ -30,6 +34,8 @@
  * @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

@@ -48,6 +54,8 @@ 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;

@@ -23,6 +23,7 @@ struct ovpn_cb_ctx {
 	struct ovpn_crypto_key_slot *ks;
 	struct aead_request *req;
 	struct scatterlist sg[MAX_SKB_FRAGS + 2];
+	size_t orig_len;
 	unsigned int payload_offset;
 };
 

@@ -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);
+	atomic64_set(&ps->rx.packets, 0);
+
+	atomic64_set(&ps->tx.bytes, 0);
+	atomic64_set(&ps->tx.packets, 0);
+}

@@ -0,0 +1,47 @@
+/* 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_
+
+/* one stat */
+struct ovpn_peer_stat {
+	atomic64_t bytes;
+	atomic64_t packets;
+};
+
+/* rx and tx stats combined */
+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);
+	atomic64_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_ */