tun: keep link (carrier) state up to date

Currently, only ethtool can get accurate link state of a tap device.
With this patch, IFF_RUNNING and IF_OPER_UP/DOWN are kept up to date as
well.

Signed-off-by: Nolan Leake <nolan@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 7 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 63042596f0cf..55f3a3e667a9 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -149,6 +149,7 @@ static int tun_attach(struct tun_struct *tun, struct file *file)
         tfile->tun = tun;
         tun->tfile = tfile;
         tun->socket.file = file;
+        netif_carrier_on(tun->dev);
         dev_hold(tun->dev);
         sock_hold(tun->socket.sk);
         atomic_inc(&tfile->count);
@@ -162,6 +163,7 @@ static void __tun_detach(struct tun_struct *tun)
 {
         /* Detach from net device */
         netif_tx_lock_bh(tun->dev);
+        netif_carrier_off(tun->dev);
         tun->tfile = NULL;
         tun->socket.file = NULL;
         netif_tx_unlock_bh(tun->dev);
@@ -1574,12 +1576,6 @@ static void tun_set_msglevel(struct net_device *dev, u32 value)
 #endif
 }
 
-static u32 tun_get_link(struct net_device *dev)
-{
-        struct tun_struct *tun = netdev_priv(dev);
-        return !!tun->tfile;
-}
-
 static u32 tun_get_rx_csum(struct net_device *dev)
 {
         struct tun_struct *tun = netdev_priv(dev);
@@ -1601,7 +1597,7 @@ static const struct ethtool_ops tun_ethtool_ops = {
         .get_drvinfo    = tun_get_drvinfo,
         .get_msglevel   = tun_get_msglevel,
         .set_msglevel   = tun_set_msglevel,
-        .get_link       = tun_get_link,
+        .get_link       = ethtool_op_get_link,
         .get_rx_csum    = tun_get_rx_csum,
         .set_rx_csum    = tun_set_rx_csum
 };