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net-sysfs: add queue_change_owner() 

Add a function to change the owner of the queue entries for a network device
when it is moved between network namespaces.

Currently, when moving network devices between network namespaces the
ownership of the corresponding queue sysfs entries are not changed. This leads
to problems when tools try to operate on the corresponding sysfs files. Fix
this.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christian Brauner 2020-02-27 04:37:18 +01:00 committed by David S. Miller
parent e6dee9f389
commit d755407d44
1 changed files with 106 additions and 0 deletions
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106
net/core/net-sysfs.c
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@ -944,6 +944,24 @@ err:
kobject_put(kobj);
return error;
}
static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
kgid_t kgid)
{
struct netdev_rx_queue *queue = dev->_rx + index;
struct kobject *kobj = &queue->kobj;
int error;
error = sysfs_change_owner(kobj, kuid, kgid);
if (error)
return error;
if (dev->sysfs_rx_queue_group)
error = sysfs_group_change_owner(
kobj, dev->sysfs_rx_queue_group, kuid, kgid);
return error;
}
#endif /* CONFIG_SYSFS */
int
@ -981,6 +999,29 @@ net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
#endif
}
static int net_rx_queue_change_owner(struct net_device *dev, int num,
kuid_t kuid, kgid_t kgid)
{
#ifdef CONFIG_SYSFS
int error = 0;
int i;
#ifndef CONFIG_RPS
if (!dev->sysfs_rx_queue_group)
return 0;
#endif
for (i = 0; i < num; i++) {
error = rx_queue_change_owner(dev, i, kuid, kgid);
if (error)
break;
}
return error;
#else
return 0;
#endif
}
#ifdef CONFIG_SYSFS
/*
* netdev_queue sysfs structures and functions.
@ -1486,6 +1527,23 @@ err:
kobject_put(kobj);
return error;
}
static int tx_queue_change_owner(struct net_device *ndev, int index,
kuid_t kuid, kgid_t kgid)
{
struct netdev_queue *queue = ndev->_tx + index;
struct kobject *kobj = &queue->kobj;
int error;
error = sysfs_change_owner(kobj, kuid, kgid);
if (error)
return error;
#ifdef CONFIG_BQL
error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
#endif
return error;
}
#endif /* CONFIG_SYSFS */
int
@ -1520,6 +1578,25 @@ netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
#endif /* CONFIG_SYSFS */
}
static int net_tx_queue_change_owner(struct net_device *dev, int num,
kuid_t kuid, kgid_t kgid)
{
#ifdef CONFIG_SYSFS
int error = 0;
int i;
for (i = 0; i < num; i++) {
error = tx_queue_change_owner(dev, i, kuid, kgid);
if (error)
break;
}
return error;
#else
return 0;
#endif /* CONFIG_SYSFS */
}
static int register_queue_kobjects(struct net_device *dev)
{
int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
@ -1554,6 +1631,31 @@ error:
return error;
}
static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
{
int error = 0, real_rx = 0, real_tx = 0;
#ifdef CONFIG_SYSFS
if (ndev->queues_kset) {
error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
if (error)
return error;
}
real_rx = ndev->real_num_rx_queues;
#endif
real_tx = ndev->real_num_tx_queues;
error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
if (error)
return error;
error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
if (error)
return error;
return 0;
}
static void remove_queue_kobjects(struct net_device *dev)
{
int real_rx = 0, real_tx = 0;
@ -1791,6 +1893,10 @@ int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
if (error)
return error;
error = queue_change_owner(ndev, new_uid, new_gid);
if (error)
return error;
return 0;
}