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net: add dev_net_rcu() helper

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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>
This commit is contained in:
Eric Dumazet 2025-02-05 15:51:09 +00:00 • committed by Jakub Kicinski
parent 3cf0a98fea
commit 482ad2a4ac
2 changed files with 7 additions and 1 deletions
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6
include/linux/netdevice.h
View file

@ -2663,6 +2663,12 @@ struct net *dev_net(const struct net_device *dev)
return read_pnet(&dev->nd_net); 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 static inline
void dev_net_set(struct net_device *dev, struct net *net) void dev_net_set(struct net_device *dev, struct net *net)
{ {

2
include/net/net_namespace.h
View file

@ -398,7 +398,7 @@ static inline struct net *read_pnet(const possible_net_t *pnet)
#endif #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 #ifdef CONFIG_NET_NS
return rcu_dereference(pnet->net); return rcu_dereference(pnet->net);