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net: treat possible_net_t net pointer as an RCU one and add read_pnet_rcu()

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[ Upstream commit 2034d90ae41ae93e30d492ebcf1f06f97a9cfba6 ]

Make the net pointer stored in possible_net_t structure annotated as
an RCU pointer. Change the access helpers to treat it as such.
Introduce read_pnet_rcu() helper to allow caller to dereference
the net pointer under RCU read lock.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: dd205fcc33d9 ("ipv4: use RCU protection in rt_is_expired()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jiri Pirko 2023-10-13 14:10:23 +02:00 • committed by Greg Kroah-Hartman
commit fde36de3b4
1 changed files with 12 additions and 3 deletions
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15
include/net/net_namespace.h
View file

@ -310,21 +310,30 @@ static inline int check_net(const struct net *net)
typedef struct {
#ifdef CONFIG_NET_NS
struct net *net;
struct net __rcu *net;
#endif
} possible_net_t;
static inline void write_pnet(possible_net_t *pnet, struct net *net)
{
#ifdef CONFIG_NET_NS
pnet->net = net;
rcu_assign_pointer(pnet->net, net);
#endif
}
static inline struct net *read_pnet(const possible_net_t *pnet)
{
#ifdef CONFIG_NET_NS
return pnet->net;
return rcu_dereference_protected(pnet->net, true);
#else
return &init_net;
#endif
}
static inline struct net *read_pnet_rcu(possible_net_t *pnet)
{
#ifdef CONFIG_NET_NS
return rcu_dereference(pnet->net);
#else
return &init_net;
#endif