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Commit 802fb176 authored by Pavel Emelyanov's avatar Pavel Emelyanov Committed by David S. Miller
Browse files

[VLAN]: Proc entry is not renamed when vlan device name changes. 



This may lead to situations, when each of two proc entries produce
data for the other's device.

Looks like a BUG, so this patch is for net-2.6. It will not apply to
net-2.6.26 since dev->nd_net access is replaced with dev_net(dev)
one.

Signed-off-by: default avatarPavel Emelyanov <xemul@openvz.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f32c5f2c

net/8021q/vlan.c

+19 −1
Original line number Diff line number Diff line
@@ -374,17 +374,35 @@ static void vlan_sync_address(struct net_device *dev, 
	memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);

}



static void __vlan_device_event(struct net_device *dev, unsigned long event)

{

	switch (event) {

	case NETDEV_CHANGENAME:

		vlan_proc_rem_dev(dev);

		if (vlan_proc_add_dev(dev) < 0)

			pr_warning("8021q: failed to change proc name for %s\n",

					dev->name);

		break;

	}

}



static int vlan_device_event(struct notifier_block *unused, unsigned long event,

			     void *ptr)

{

	struct net_device *dev = ptr;

	struct vlan_group *grp = __vlan_find_group(dev->ifindex);

	struct vlan_group *grp;

	int i, flgs;

	struct net_device *vlandev;



	if (dev->nd_net != &init_net)

		return NOTIFY_DONE;



	if (is_vlan_dev(dev)) {

		__vlan_device_event(dev, event);

		goto out;

	}



	grp = __vlan_find_group(dev->ifindex);

	if (!grp)

		goto out;

net/8021q/vlan.h

+5 −0
Original line number Diff line number Diff line
@@ -45,4 +45,9 @@ void vlan_netlink_fini(void); 


extern struct rtnl_link_ops vlan_link_ops;



static inline int is_vlan_dev(struct net_device *dev)

{

	return dev->priv_flags & IFF_802_1Q_VLAN;

}



#endif /* !(__BEN_VLAN_802_1Q_INC__) */

net/8021q/vlanproc.c

+0 −5
Original line number Diff line number Diff line
@@ -210,11 +210,6 @@ int vlan_proc_rem_dev(struct net_device *vlandev) 
 * The following few functions build the content of /proc/net/vlan/config

 */



static inline int is_vlan_dev(struct net_device *dev)

{

	return dev->priv_flags & IFF_802_1Q_VLAN;

}



/* start read of /proc/net/vlan/config */

static void *vlan_seq_start(struct seq_file *seq, loff_t *pos)

	__acquires(dev_base_lock)