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batman-adv: Fix debugfs path for renamed softif

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batman-adv is creating special debugfs directories in the init
net_namespace for each created soft-interface (batadv net_device). But it
is possible to rename a net_device to a completely different name then the
original one.

It can therefore happen that a user registers a new batadv net_device with
the name "bat0". batman-adv is then also adding a new directory under
$debugfs/batman-adv/ with the name "wlan0".

The user then decides to rename this device to "bat1" and registers a
different batadv device with the name "bat0". batman-adv will then try to
create a directory with the name "bat0" under $debugfs/batman-adv/ again.
But there already exists one with this name under this path and thus this
fails. batman-adv will detect a problem and rollback the registering of
this device.

batman-adv must therefore take care of renaming the debugfs directories for
soft-interfaces whenever it detects such a net_device rename.

Fixes: c6c8fea297 ("net: Add batman-adv meshing protocol")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Sven Eckelmann
2018-06-01 19:24:24 +02:00
committed by Simon Wunderlich
parent 36dc621cec
commit 6da7be7d24
3 changed files with 53 additions and 6 deletions
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5
net/batman-adv/debugfs.h
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@@ -30,6 +30,7 @@ struct net_device;
void batadv_debugfs_init(void);
void batadv_debugfs_destroy(void);
int batadv_debugfs_add_meshif(struct net_device *dev);
void batadv_debugfs_rename_meshif(struct net_device *dev);
void batadv_debugfs_del_meshif(struct net_device *dev);
int batadv_debugfs_add_hardif(struct batadv_hard_iface *hard_iface);
void batadv_debugfs_rename_hardif(struct batadv_hard_iface *hard_iface);
@@ -50,6 +51,10 @@ static inline int batadv_debugfs_add_meshif(struct net_device *dev)
return 0;
}
static inline void batadv_debugfs_rename_meshif(struct net_device *dev)
{
}
static inline void batadv_debugfs_del_meshif(struct net_device *dev)
{
}