netdev - [PATCH v2 net-next 3/3] net: Hold rtnl_net_lock() in (un)?register_netdevice_notifier_dev

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Message-ID: <20250106070751.63146-4-kuniyu@amazon.com>
Date: Mon, 6 Jan 2025 16:07:51 +0900
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Simon Horman <horms@...nel.org>
CC: Kuniyuki Iwashima <kuniyu@...zon.com>, Kuniyuki Iwashima
	<kuni1840@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH v2 net-next 3/3] net: Hold rtnl_net_lock() in (un)?register_netdevice_notifier_dev_net().

(un)?register_netdevice_notifier_dev_net() hold RTNL before triggering
the notifier for all netdev in the netns.

Let's convert the RTNL to rtnl_net_lock().

Note that move_netdevice_notifiers_dev_net() is assumed to be (but not
yet) protected by per-netns RTNL of both src and dst netns; we need to
convert wireless and hyperv drivers that call dev_change_net_namespace().

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
---
 net/core/dev.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 6212c8b91fce..5086b5b55409 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1946,15 +1946,17 @@ int register_netdevice_notifier_dev_net(struct net_device *dev,
 					struct notifier_block *nb,
 					struct netdev_net_notifier *nn)
 {
+	struct net *net = dev_net(dev);
 	int err;
 
-	rtnl_lock();
-	err = __register_netdevice_notifier_net(dev_net(dev), nb, false);
+	rtnl_net_lock(net);
+	err = __register_netdevice_notifier_net(net, nb, false);
 	if (!err) {
 		nn->nb = nb;
 		list_add(&nn->list, &dev->net_notifier_list);
 	}
-	rtnl_unlock();
+	rtnl_net_unlock(net);
+
 	return err;
 }
 EXPORT_SYMBOL(register_netdevice_notifier_dev_net);
@@ -1963,12 +1965,14 @@ int unregister_netdevice_notifier_dev_net(struct net_device *dev,
 					  struct notifier_block *nb,
 					  struct netdev_net_notifier *nn)
 {
+	struct net *net = dev_net(dev);
 	int err;
 
-	rtnl_lock();
+	rtnl_net_lock(net);
 	list_del(&nn->list);
-	err = __unregister_netdevice_notifier_net(dev_net(dev), nb);
-	rtnl_unlock();
+	err = __unregister_netdevice_notifier_net(net, nb);
+	rtnl_net_unlock(net);
+
 	return err;
 }
 EXPORT_SYMBOL(unregister_netdevice_notifier_dev_net);
-- 
2.39.5 (Apple Git-154)