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net: add dev_net_rcu() helper 

[ Upstream commit 482ad2a4ace2740ca0ff1cbc8f3c7f862f3ab507 ]

dev->nd_net can change, readers should either
use rcu_read_lock() or RTNL.

We currently use a generic helper, dev_net() with
no debugging support. We probably have many hidden bugs.

Add dev_net_rcu() helper for callers using rcu_read_lock()
protection.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250205155120.1676781-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 71b8471c93fa ("ipv4: use RCU protection in ipv4_default_advmss()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet 2025-02-05 15:51:09 +00:00 committed by Greg Kroah-Hartman
parent 4cfecb7fc7
commit 81f369b670
2 changed files with 7 additions and 1 deletions
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6
include/linux/netdevice.h
View File

@ -2593,6 +2593,12 @@ struct net *dev_net(const struct net_device *dev)
return read_pnet(&dev->nd_net);
}
static inline
struct net *dev_net_rcu(const struct net_device *dev)
{
return read_pnet_rcu(&dev->nd_net);
}
static inline
void dev_net_set(struct net_device *dev, struct net *net)
{

2
include/net/net_namespace.h
View File

@ -389,7 +389,7 @@ static inline struct net *read_pnet(const possible_net_t *pnet)
#endif
}
static inline struct net *read_pnet_rcu(possible_net_t *pnet)
static inline struct net *read_pnet_rcu(const possible_net_t *pnet)
{
#ifdef CONFIG_NET_NS
return rcu_dereference(pnet->net);