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net: dev: fix incorrect getting net device's name

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When moving a nic from net namespace A to net namespace B,
in dev_change_net_namesapce,we call __dev_get_by_name to
decide if the netns B has the device has the same name.

if the netns B already has the same named device,we call
dev_get_valid_name to try to get a valid name for this nic in
the netns B,but net_device->nd_net still point to netns A now.

this patch fix it.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gao feng 2012-09-13 20:58:27 +00:00 committed by David S. Miller
parent 3fd91fb358
commit 828de4f6bf
1 changed files with 20 additions and 8 deletions
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28
net/core/dev.c
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@ -959,18 +959,30 @@ int dev_alloc_name(struct net_device *dev, const char *name)
}
EXPORT_SYMBOL(dev_alloc_name);
static int dev_get_valid_name(struct net_device *dev, const char *name)
static int dev_alloc_name_ns(struct net *net,
struct net_device *dev,
const char *name)
{
struct net *net;
char buf[IFNAMSIZ];
int ret;
BUG_ON(!dev_net(dev));
net = dev_net(dev);
ret = __dev_alloc_name(net, name, buf);
if (ret >= 0)
strlcpy(dev->name, buf, IFNAMSIZ);
return ret;
}
static int dev_get_valid_name(struct net *net,
struct net_device *dev,
const char *name)
{
BUG_ON(!net);
if (!dev_valid_name(name))
return -EINVAL;
if (strchr(name, '%'))
return dev_alloc_name(dev, name);
return dev_alloc_name_ns(net, dev, name);
else if (__dev_get_by_name(net, name))
return -EEXIST;
else if (dev->name != name)
@ -1006,7 +1018,7 @@ int dev_change_name(struct net_device *dev, const char *newname)
memcpy(oldname, dev->name, IFNAMSIZ);
err = dev_get_valid_name(dev, newname);
err = dev_get_valid_name(net, dev, newname);
if (err < 0)
return err;
@ -5589,7 +5601,7 @@ int register_netdevice(struct net_device *dev)
dev->iflink = -1;
ret = dev_get_valid_name(dev, dev->name);
ret = dev_get_valid_name(net, dev, dev->name);
if (ret < 0)
goto out;
@ -6233,7 +6245,7 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
/* We get here if we can't use the current device name */
if (!pat)
goto out;
if (dev_get_valid_name(dev, pat) < 0)
if (dev_get_valid_name(net, dev, pat) < 0)
goto out;
}