AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

batman-adv: free an hard-interface before adding it

Browse Source 
When adding a new hard interface (e.g. 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 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>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
This commit is contained in:
Antonio Quartulli 2013-02-16 14:42:39 +01:00
parent 3dbd550b8b
commit cb4b0d4864
1 changed files with 33 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
net/batman-adv/hard-interface.c
View File

@ -307,11 +307,35 @@ batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
batadv_update_min_mtu(hard_iface->soft_iface);
}
/**
* batadv_master_del_slave - remove hard_iface from the current master interface
* @slave: the interface enslaved in another master
* @master: the master from which slave has to be removed
*
* Invoke ndo_del_slave on master passing slave as argument. In this way slave
* is free'd and master can correctly change its internal state.
* Return 0 on success, a negative value representing the error otherwise
*/
static int batadv_master_del_slave(struct batadv_hard_iface *slave,
struct net_device *master)
{
int ret;
if (!master)
return 0;
ret = -EBUSY;
if (master->netdev_ops->ndo_del_slave)
ret = master->netdev_ops->ndo_del_slave(master, slave->net_dev);
return ret;
}
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 +345,6 @@ 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 +366,14 @@ 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);
ret = batadv_master_del_slave(hard_iface, master);
if (ret)
goto err_dev;
hard_iface->soft_iface = soft_iface;
bat_priv = netdev_priv(hard_iface->soft_iface);