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[NET]: Make device event notification network namespace safe

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Every user of the network device notifiers is either a protocol
stack or a pseudo device.  If a protocol stack that does not have
support for multiple network namespaces receives an event for a
device that is not in the initial network namespace it quite possibly
can get confused and do the wrong thing.

To avoid problems until all of the protocol stacks are converted
this patch modifies all netdev event handlers to ignore events on
devices that are not in the initial network namespace.

As the rest of the code is made network namespace aware these
checks can be removed.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman
2007-09-12 13:02:17 +02:00
committed by David S. Miller
parent e730c15519
commit e9dc865340
38 changed files with 126 additions and 1 deletions
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4
net/core/dst.c
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@ -15,6 +15,7 @@
#include <linux/skbuff.h>
#include <linux/string.h>
#include <linux/types.h>
#include <net/net_namespace.h>
#include <net/dst.h>
@ -252,6 +253,9 @@ static int dst_dev_event(struct notifier_block *this, unsigned long event, void
struct net_device *dev = ptr;
struct dst_entry *dst;
if (dev->nd_net != &init_net)
return NOTIFY_DONE;
switch (event) {
case NETDEV_UNREGISTER:
case NETDEV_DOWN: