linux-kernel - [PATCH net-next v24 04/23] ovpn: keep carrier always on for MP interfaces

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Message-Id: <20250318-b4-ovpn-v24-4-3ec4ab5c4a77@openvpn.net>
Date: Tue, 18 Mar 2025 02:40:39 +0100
From: Antonio Quartulli <antonio@...nvpn.net>
To: netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Donald Hunter <donald.hunter@...il.com>, 
 Antonio Quartulli <antonio@...nvpn.net>, Shuah Khan <shuah@...nel.org>, 
 sd@...asysnail.net, ryazanov.s.a@...il.com, 
 Andrew Lunn <andrew+netdev@...n.ch>
Cc: Simon Horman <horms@...nel.org>, linux-kernel@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, Xiao Liang <shaw.leon@...il.com>
Subject: [PATCH net-next v24 04/23] ovpn: keep carrier always on for MP
 interfaces

An ovpn interface configured in MP mode will keep carrier always
on and let the user decide when to bring it administratively up and
down.

This way a MP node (i.e. a server) will keep its interface always
up and running, even when no peer is connected.

Signed-off-by: Antonio Quartulli <antonio@...nvpn.net>
---
 drivers/net/ovpn/main.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/net/ovpn/main.c b/drivers/net/ovpn/main.c
index b19f1406d87d5a1ed45b00133d642b1ad9f4f6f7..15802dfd26fcbcad42c387d42f665b8b47604e8a 100644
--- a/drivers/net/ovpn/main.c
+++ b/drivers/net/ovpn/main.c
@@ -21,7 +21,22 @@
 #include "io.h"
 #include "proto.h"
 
+static int ovpn_net_open(struct net_device *dev)
+{
+	struct ovpn_priv *ovpn = netdev_priv(dev);
+
+	/* carrier for P2P interfaces is switched on and off when
+	 * the peer is added or deleted.
+	 *
+	 * in case of P2MP interfaces we just keep the carrier always on
+	 */
+	if (ovpn->mode == OVPN_MODE_MP)
+		netif_carrier_on(dev);
+	return 0;
+}
+
 static const struct net_device_ops ovpn_netdev_ops = {
+	.ndo_open		= ovpn_net_open,
 	.ndo_start_xmit		= ovpn_net_xmit,
 };
 

-- 
2.48.1