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netns: Coexist with the sysfs limitations v2

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To make testing of the network namespace simpler allow
the network namespace code and the sysfs code to be
compiled and run at the same time.  To do this only
virtual devices are allowed in the additional network
namespaces and those virtual devices are not placed
in the kobject tree.

Since virtual devices don't actually do anything interesting
hardware wise that needs device management there should
be no loss in keeping them out of the kobject tree and
by implication sysfs.  The gain in ease of testing
and code coverage should be significant.

Changelog:

v2: As pointed out by Benjamin Thery it only makes sense to call
    device_rename in the initial network namespace for now.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Benjamin Thery <benjamin.thery@bull.net>
Tested-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2008-10-27 17:51:47 -07:00 committed by David S. Miller
parent 7c510e4b73
commit 3891845e1e
3 changed files with 28 additions and 6 deletions
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2
net/Kconfig
View file

@ -27,7 +27,7 @@ menu "Networking options"
config NET_NS
bool "Network namespace support"
default n
depends on EXPERIMENTAL && !SYSFS && NAMESPACES
depends on EXPERIMENTAL && NAMESPACES
help
Allow user space to create what appear to be multiple instances
of the network stack.

17
net/core/dev.c
View file

@ -924,11 +924,16 @@ int dev_change_name(struct net_device *dev, const char *newname)
strlcpy(dev->name, newname, IFNAMSIZ);
rollback:
/* For now only devices in the initial network namespace
* are in sysfs.
*/
if (net == &init_net) {
ret = device_rename(&dev->dev, dev->name);
if (ret) {
memcpy(dev->name, oldname, IFNAMSIZ);
return ret;
}
}
write_lock_bh(&dev_base_lock);
hlist_del(&dev->name_hlist);
@ -4460,6 +4465,15 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
if (dev->features & NETIF_F_NETNS_LOCAL)
goto out;
#ifdef CONFIG_SYSFS
/* Don't allow real devices to be moved when sysfs
* is enabled.
*/
err = -EINVAL;
if (dev->dev.parent)
goto out;
#endif
/* Ensure the device has been registrered */
err = -EINVAL;
if (dev->reg_state != NETREG_REGISTERED)
@ -4517,6 +4531,8 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
*/
dev_addr_discard(dev);
netdev_unregister_kobject(dev);
/* Actually switch the network namespace */
dev_net_set(dev, net);
@ -4533,7 +4549,6 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
}
/* Fixup kobjects */
netdev_unregister_kobject(dev);
err = netdev_register_kobject(dev);
WARN_ON(err);

7
net/core/net-sysfs.c
View file

@ -476,6 +476,10 @@ void netdev_unregister_kobject(struct net_device * net)
struct device *dev = &(net->dev);
kobject_get(&dev->kobj);
if (dev_net(net) != &init_net)
return;
device_del(dev);
}
@ -501,6 +505,9 @@ int netdev_register_kobject(struct net_device *net)
#endif
#endif /* CONFIG_SYSFS */
if (dev_net(net) != &init_net)
return 0;
return device_add(dev);
}