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@openvpn.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