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authorEric Dumazet <edumazet@google.com>2012-08-22 21:50:59 +0000
committerDavid S. Miller <davem@davemloft.net>2012-08-23 09:24:42 -0700
commit748e2d9396a18c3fd3d07d47c1b41320acf1fbf4 (patch)
tree49bde8c370615258baada1d43acda2b3fb3625c2
parent0fa7fa98dbcc2789409ed24e885485e645803d7f (diff)
downloadop-kernel-dev-748e2d9396a18c3fd3d07d47c1b41320acf1fbf4.zip
op-kernel-dev-748e2d9396a18c3fd3d07d47c1b41320acf1fbf4.tar.gz
net: reinstate rtnl in call_netdevice_notifiers()
Eric Biederman pointed out that not holding RTNL while calling call_netdevice_notifiers() was racy. This patch is a direct transcription his feedback against commit 0115e8e30d6fc (net: remove delay at device dismantle) Thanks Eric ! Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Tom Herbert <therbert@google.com> Cc: Mahesh Bandewar <maheshb@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Gao feng <gaofeng@cn.fujitsu.com> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/core/dev.c9
-rw-r--r--net/core/fib_rules.c3
-rw-r--r--net/ipv4/devinet.c6
-rw-r--r--net/ipv4/fib_frontend.c7
-rw-r--r--net/ipv6/addrconf.c6
5 files changed, 12 insertions, 19 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 0640d2a..bc857fe 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1466,8 +1466,7 @@ EXPORT_SYMBOL(unregister_netdevice_notifier);
int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
{
- if (val != NETDEV_UNREGISTER_FINAL)
- ASSERT_RTNL();
+ ASSERT_RTNL();
return raw_notifier_call_chain(&netdev_chain, val, dev);
}
EXPORT_SYMBOL(call_netdevice_notifiers);
@@ -5782,7 +5781,11 @@ static void netdev_wait_allrefs(struct net_device *dev)
/* Rebroadcast unregister notification */
call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
+
+ __rtnl_unlock();
rcu_barrier();
+ rtnl_lock();
+
call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
&dev->state)) {
@@ -5855,7 +5858,9 @@ void netdev_run_todo(void)
= list_first_entry(&list, struct net_device, todo_list);
list_del(&dev->todo_list);
+ rtnl_lock();
call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
+ __rtnl_unlock();
if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
pr_err("network todo '%s' but state %d\n",
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 5850937..ab7db83 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -711,16 +711,15 @@ static int fib_rules_event(struct notifier_block *this, unsigned long event,
struct net *net = dev_net(dev);
struct fib_rules_ops *ops;
+ ASSERT_RTNL();
switch (event) {
case NETDEV_REGISTER:
- ASSERT_RTNL();
list_for_each_entry(ops, &net->rules_ops, list)
attach_rules(&ops->rules_list, dev);
break;
case NETDEV_UNREGISTER:
- ASSERT_RTNL();
list_for_each_entry(ops, &net->rules_ops, list)
detach_rules(&ops->rules_list, dev);
break;
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 6a5e6e4..adf273f 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1147,12 +1147,8 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
void *ptr)
{
struct net_device *dev = ptr;
- struct in_device *in_dev;
-
- if (event == NETDEV_UNREGISTER_FINAL)
- goto out;
+ struct in_device *in_dev = __in_dev_get_rtnl(dev);
- in_dev = __in_dev_get_rtnl(dev);
ASSERT_RTNL();
if (!in_dev) {
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index fd7d9ae..acdee32 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -1050,9 +1050,6 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
return NOTIFY_DONE;
}
- if (event == NETDEV_UNREGISTER_FINAL)
- return NOTIFY_DONE;
-
in_dev = __in_dev_get_rtnl(dev);
switch (event) {
@@ -1064,14 +1061,14 @@ static int fib_netdev_event(struct notifier_block *this, unsigned long event, vo
fib_sync_up(dev);
#endif
atomic_inc(&net->ipv4.dev_addr_genid);
- rt_cache_flush(dev_net(dev), -1);
+ rt_cache_flush(net, -1);
break;
case NETDEV_DOWN:
fib_disable_ip(dev, 0, 0);
break;
case NETDEV_CHANGEMTU:
case NETDEV_CHANGE:
- rt_cache_flush(dev_net(dev), 0);
+ rt_cache_flush(net, 0);
break;
}
return NOTIFY_DONE;
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index e581009..6bc85f7 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2566,14 +2566,10 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
void *data)
{
struct net_device *dev = (struct net_device *) data;
- struct inet6_dev *idev;
+ struct inet6_dev *idev = __in6_dev_get(dev);
int run_pending = 0;
int err;
- if (event == NETDEV_UNREGISTER_FINAL)
- return NOTIFY_DONE;
-
- idev = __in6_dev_get(dev);
switch (event) {
case NETDEV_REGISTER:
if (!idev && dev->mtu >= IPV6_MIN_MTU) {
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