diff options
| author | Eric Dumazet <edumazet@google.com> | 2025-02-05 18:51:09 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-21 15:50:06 +0300 |
| commit | e2b01044d94ec895c065e0e48115e6ce01432152 (patch) | |
| tree | bb69beaa19ba2c1a7748404ac8e6d7b8025882ab /include | |
| parent | 7bafb66f5456861021c1f756342a328c32ad6a4b (diff) | |
| download | linux-e2b01044d94ec895c065e0e48115e6ce01432152.tar.xz | |
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netdevice.h | 6 | ||||
| -rw-r--r-- | include/net/net_namespace.h | 2 |
2 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index c75aed1fff7d..d0b4920dee73 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2539,6 +2539,12 @@ struct net *dev_net(const struct net_device *dev) } 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) { write_pnet(&dev->nd_net, net); diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index 3ffcc1b02a59..ee50d5493662 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -373,7 +373,7 @@ 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); |