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[Openvpn-devel,ovpn-net-next] ovpn: propagate socket mark to skb in UDP

Message ID 20250604131158.1417342-1-ralf@mandelbit.com
State New
Headers show
Series [Openvpn-devel,ovpn-net-next] ovpn: propagate socket mark to skb in UDP | expand

Commit Message

Ralf Lici June 4, 2025, 1:11 p.m. UTC 
openvpn implements the `--mark` option, which utilizes the `SO_MARK`
Linux socket option. However, in the UDP code path, the socket's
`sk_mark` value is not currently propagated to `skb` objects that pass
through our socket.

This commit ensures proper inheritance of the field by assigning
`sk_mark` to `skb->mark` before handing the `skb` to the network stack
for transmission.

Signed-off-by: Ralf Lici <ralf@mandelbit.com>
---
 drivers/net/ovpn/udp.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/drivers/net/ovpn/udp.c b/drivers/net/ovpn/udp.c
index b4fbebad8f45..4f9c9a9a889a 100644
--- a/drivers/net/ovpn/udp.c
+++ b/drivers/net/ovpn/udp.c
@@ -344,6 +344,7 @@  void ovpn_udp_send_skb(struct ovpn_peer *peer, struct sock *sk,
 	int ret;
 
 	skb->dev = peer->ovpn->dev;
+	skb->mark = READ_ONCE(sk->sk_mark);
 	/* no checksum performed at this layer */
 	skb->ip_summed = CHECKSUM_NONE;