[PATCH net-next v9 11/23] ovpn: store tunnel and transport statistics

Antonio Quartulli
2024-10-16T01:04:04Z

Byte/packet counters for in-tunnel and transport streams
are now initialized and updated as needed.

To be exported via netlink.

Signed-off-by: Antonio Quartulli <antonio@openvpn.net>
---
drivers/net/ovpn/Makefile | 1 +
drivers/net/ovpn/crypto_aead.c | 2 ++
drivers/net/ovpn/io.c | 12 +++++++++++
drivers/net/ovpn/peer.c | 2 ++
drivers/net/ovpn/peer.h | 5 +++++
drivers/net/ovpn/skb.h | 1 +
drivers/net/ovpn/stats.c | 21 +++++++++++++++++++
drivers/net/ovpn/stats.h | 47 ++++++++++++++++++++++++++++++++++++++++++
8 files changed, 91 insertions(+)

diff --git a/drivers/net/ovpn/Makefile b/drivers/net/ovpn/Makefile
index ccdaeced1982c851475657860a005ff2b9dfbd13..d43fda72646bdc7644d9a878b56da0a0e5680c98 100644
--- a/drivers/net/ovpn/Makefile
+++ b/drivers/net/ovpn/Makefile
@@ -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
diff --git a/drivers/net/ovpn/crypto_aead.c b/drivers/net/ovpn/crypto_aead.c
index 97134ac679c67a3d44a0bf49c2ddf058fd7c0e99..6599c8550390a60d3b0fb9c144beb8c7871bc320 100644
--- a/drivers/net/ovpn/crypto_aead.c
+++ b/drivers/net/ovpn/crypto_aead.c
@@ -128,6 +128,7 @@ 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;
@@ -216,6 +217,7 @@ 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;
diff --git a/drivers/net/ovpn/io.c b/drivers/net/ovpn/io.c
index e9d49d10cf4e9b755d7253140b1baf55c49e8144..a770ef956792585d9b6bc779db2d3a353b349389 100644
--- a/drivers/net/ovpn/io.c
+++ b/drivers/net/ovpn/io.c
@@ -12,6 +12,7 @@
#include <linux/skbuff.h>
#include <net/gro_cells.h>
#include <net/gso.h>
+#include <net/ip.h>

#include "ovpnstruct.h"
#include "peer.h"
@@ -21,6 +22,7 @@
#include "crypto_aead.h"
#include "netlink.h"
#include "proto.h"
+#include "socket.h"
#include "udp.h"
#include "skb.h"
#include "socket.h"
@@ -68,6 +70,7 @@ void ovpn_decrypt_post(void *data, int ret)
unsigned int payload_offset = 0;
struct ovpn_peer *peer = NULL;
struct sk_buff *skb = data;
+ unsigned int orig_len = 0;
__be16 proto;
__be32 *pid;

@@ -82,6 +85,7 @@ void ovpn_decrypt_post(void *data, int ret)
payload_offset = ovpn_skb_cb(skb)->ctx->payload_offset;
ks = ovpn_skb_cb(skb)->ctx->ks;
peer = ovpn_skb_cb(skb)->ctx->peer;
+ orig_len = ovpn_skb_cb(skb)->ctx->orig_len;

aead_request_free(ovpn_skb_cb(skb)->ctx->req);
kfree(ovpn_skb_cb(skb)->ctx);
@@ -135,6 +139,10 @@ void ovpn_decrypt_post(void *data, 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, orig_len);
+
ovpn_netdev_write(peer, skb);
/* skb is passed to upper layer - don't free it */
skb = NULL;
@@ -173,6 +181,7 @@ void ovpn_encrypt_post(void *data, int ret)
{
struct ovpn_peer *peer = NULL;
struct sk_buff *skb = data;
+ unsigned int orig_len = 0;

/* encryption is happening asynchronously. This function will be
* called later by the crypto callback with a proper return value
@@ -183,6 +192,7 @@ void ovpn_encrypt_post(void *data, int ret)
/* crypto is done, cleanup skb CB and its members */
if (likely(ovpn_skb_cb(skb)->ctx)) {
peer = ovpn_skb_cb(skb)->ctx->peer;
+ orig_len = ovpn_skb_cb(skb)->ctx->orig_len;

ovpn_crypto_key_slot_put(ovpn_skb_cb(skb)->ctx->ks);
aead_request_free(ovpn_skb_cb(skb)->ctx->req);
@@ -194,6 +204,8 @@ void ovpn_encrypt_post(void *data, 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, orig_len);

switch (peer->sock->sock->sk->sk_protocol) {
case IPPROTO_UDP:
diff --git a/drivers/net/ovpn/peer.c b/drivers/net/ovpn/peer.c
index 98ae7662f1e76811e625dc5f4b4c5c884856fbd6..5025bfb759d6a5f31e3f2ec094fe561fbdb9f451 100644
--- a/drivers/net/ovpn/peer.c
+++ b/drivers/net/ovpn/peer.c
@@ -48,6 +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) {
diff --git a/drivers/net/ovpn/peer.h b/drivers/net/ovpn/peer.h
index 754fea470d1b4787f64a931d6c6adc24182fc16f..eb1e31e854fbfff25d07fba8026789e41a76c113 100644
--- a/drivers/net/ovpn/peer.h
+++ b/drivers/net/ovpn/peer.h
@@ -13,6 +13,7 @@
#include <net/dst_cache.h>

#include "crypto.h"
+#include "stats.h"

/**
* struct ovpn_peer - the main remote peer object
@@ -26,6 +27,8 @@
* @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
@@ -44,6 +47,8 @@ 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;
diff --git a/drivers/net/ovpn/skb.h b/drivers/net/ovpn/skb.h
index 3f94efae20fb58772c1a4c47df5bae8bb11ad322..3d9f38b081a6531456a8fba3b15ed3e7cae4240c 100644
--- a/drivers/net/ovpn/skb.h
+++ b/drivers/net/ovpn/skb.h
@@ -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;
};

diff --git a/drivers/net/ovpn/stats.c b/drivers/net/ovpn/stats.c
new file mode 100644
index 0000000000000000000000000000000000000000..a383842c3449b73694c318837b0b92eb9afaec22
--- /dev/null
+++ b/drivers/net/ovpn/stats.c
@@ -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);
+}
diff --git a/drivers/net/ovpn/stats.h b/drivers/net/ovpn/stats.h
new file mode 100644
index 0000000000000000000000000000000000000000..868f49d25eaa8fef04a02a61c363d95f9c9ef80a
--- /dev/null
+++ b/drivers/net/ovpn/stats.h
@@ -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_ */

--
2.45.2