[NET]: Make device event notification network namespace safe

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>

6 files changed, 18 insertions, 0 deletions

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index e4e5fdc0430b..cf97d8a6326e 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3299,6 +3299,9 @@ static int bond_netdev_event(struct notifier_block *this, unsigned long event, v
 {
         struct net_device *event_dev = (struct net_device *)ptr;
 
+        if (event_dev->nd_net != &init_net)
+                return NOTIFY_DONE;
+
         dprintk("event_dev: %s, event: %lx\n",
                 (event_dev ? event_dev->name : "None"),
                 event);
diff --git a/drivers/net/hamradio/bpqether.c b/drivers/net/hamradio/bpqether.c
index 85fb8e7efacf..df09210f7351 100644
--- a/drivers/net/hamradio/bpqether.c
+++ b/drivers/net/hamradio/bpqether.c
@@ -563,6 +563,9 @@ static int bpq_device_event(struct notifier_block *this,unsigned long event, voi
 {
         struct net_device *dev = (struct net_device *)ptr;
 
+        if (dev->nd_net != &init_net)
+                return NOTIFY_DONE;
+
         if (!dev_is_ethdev(dev))
                 return NOTIFY_DONE;
 
diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index 60c0e4e17875..c5c70e4b1d36 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -301,6 +301,9 @@ static int pppoe_device_event(struct notifier_block *this,
 {
         struct net_device *dev = (struct net_device *) ptr;
 
+        if (dev->nd_net != &init_net)
+                return NOTIFY_DONE;
+
         /* Only look at sockets that are using this specific device. */
         switch (event) {
         case NETDEV_CHANGEMTU:
diff --git a/drivers/net/wan/dlci.c b/drivers/net/wan/dlci.c
index 66be20c292b6..61041d5186ac 100644
--- a/drivers/net/wan/dlci.c
+++ b/drivers/net/wan/dlci.c
@@ -513,6 +513,9 @@ static int dlci_dev_event(struct notifier_block *unused,
 {
         struct net_device *dev = (struct net_device *) ptr;
 
+        if (dev->nd_net != &init_net)
+                return NOTIFY_DONE;
+
         if (event == NETDEV_UNREGISTER) {
                 struct dlci_local *dlp;
 
diff --git a/drivers/net/wan/hdlc.c b/drivers/net/wan/hdlc.c
index 3b57350eacca..ee23b91f23d9 100644
--- a/drivers/net/wan/hdlc.c
+++ b/drivers/net/wan/hdlc.c
@@ -109,6 +109,9 @@ static int hdlc_device_event(struct notifier_block *this, unsigned long event,
         unsigned long flags;
         int on;
  
+        if (dev->nd_net != &init_net)
+                return NOTIFY_DONE;
+
         if (dev->get_stats != hdlc_get_stats)
                 return NOTIFY_DONE; /* not an HDLC device */
  
diff --git a/drivers/net/wan/lapbether.c b/drivers/net/wan/lapbether.c
index ca8b3c3cb931..699b93406dfb 100644
--- a/drivers/net/wan/lapbether.c
+++ b/drivers/net/wan/lapbether.c
@@ -394,6 +394,9 @@ static int lapbeth_device_event(struct notifier_block *this,
         struct lapbethdev *lapbeth;
         struct net_device *dev = ptr;
 
+        if (dev->nd_net != &init_net)
+                return NOTIFY_DONE;
+
         if (!dev_is_ethdev(dev))
                 return NOTIFY_DONE;