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authorPravin B Shelar <pshelar@nicira.com>2013-09-24 19:25:40 +0200
committerDavid S. Miller <davem@davemloft.net>2013-09-30 20:22:59 +0200
commit559835ea7292e2f09304d81eda16f4209433245e (patch)
tree516a56d352969181deffa05466c7a0cfd0e15dc1 /include
parentnet: net_secret should not depend on TCP (diff)
downloadlinux-559835ea7292e2f09304d81eda16f4209433245e.tar.xz
linux-559835ea7292e2f09304d81eda16f4209433245e.zip
vxlan: Use RCU apis to access sk_user_data.
Use of RCU api makes vxlan code easier to understand. It also fixes bug due to missing ACCESS_ONCE() on sk_user_data dereference. In rare case without ACCESS_ONCE() compiler might omit vs on sk_user_data dereference. Compiler can use vs as alias for sk->sk_user_data, resulting in multiple sk_user_data dereference in rcu read context which could change. CC: Jesse Gross <jesse@nicira.com> Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/sock.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/net/sock.h b/include/net/sock.h
index 6ba2e7b0e2b1..1d37a8086bed 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -409,6 +409,11 @@ struct sock {
void (*sk_destruct)(struct sock *sk);
};
+#define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data)))
+
+#define rcu_dereference_sk_user_data(sk) rcu_dereference(__sk_user_data((sk)))
+#define rcu_assign_sk_user_data(sk, ptr) rcu_assign_pointer(__sk_user_data((sk)), ptr)
+
/*
* SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK
* or not whether his port will be reused by someone else. SK_FORCE_REUSE