[B.A.T.M.A.N.] [PATCH 1/2] batman-adv: free an hard-interface before adding it

Antonio Quartulli
2013-02-12T15:21:55Z

When adding a new hard interface (e.h. wlan0) to a soft interface (e.g. bat0)
and the former is already enslaved in another virtual interface (e.g. a software
bridge) batman-adv has to free the it first and then continue with the
adding mechanism.

In this way the behaviour becomes consistent with what "ip link set master"
does. At the moment batman-adv enslaves the hard interface without checking for
the master device, possibly causing strange behaviours which are never wanted by
the users.

Reported-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
---

** Work based on top of the 6 patches adding the new rtnl interface for
interface enslaving.

Cheers,

hard-interface.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/hard-interface.c b/hard-interface.c
index c08e39e..fd99e42 100644
--- a/hard-interface.c
+++ b/hard-interface.c
@@ -311,7 +311,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
const char *iface_name)
{
struct batadv_priv *bat_priv;
- struct net_device *soft_iface;
+ struct net_device *soft_iface, *master;
__be16 ethertype = __constant_htons(ETH_P_BATMAN);
int ret;

@@ -321,11 +321,6 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
if (!atomic_inc_not_zero(&hard_iface->refcount))
goto out;

- /* hard-interface is part of a bridge */
- if (hard_iface->net_dev->priv_flags & IFF_BRIDGE_PORT)
- pr_err("You are about to enable batman-adv on '%s' which already is part of a bridge. Unless you know exactly what you are doing this is probably wrong and won't work the way you think it would.\n",
- hard_iface->net_dev->name);
-
soft_iface = dev_get_by_name(&init_net, iface_name);

if (!soft_iface) {
@@ -347,6 +342,13 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
goto err_dev;
}

+ /* check if the interface is enslaved in another virtual one and
+ * in that case unlink it first
+ */
+ master = netdev_master_upper_dev_get(hard_iface->net_dev);
+ if (master)
+ netdev_upper_dev_unlink(hard_iface->net_dev, master);
+
hard_iface->soft_iface = soft_iface;
bat_priv = netdev_priv(hard_iface->soft_iface);

--
1.8.1.2