netdev - [PATCH net v3] vxlan: Use RCU apis to access sk_user

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Message-Id: <1380043540-10417-1-git-send-email-pshelar@nicira.com>
Date:	Tue, 24 Sep 2013 10:25:40 -0700
From:	Pravin B Shelar <pshelar@...ira.com>
To:	netdev@...r.kernel.org
Cc:	eric.dumazet@...il.com, stephen@...workplumber.org,
	Pravin B Shelar <pshelar@...ira.com>,
	Jesse Gross <jesse@...ira.com>
Subject: [PATCH net v3] 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@...ira.com>
Signed-off-by: Pravin B Shelar <pshelar@...ira.com>
---
v3:
remove extra space
User rcu_deref and rcu_assign api for accessing sk_user_data
v2:
Use RCU_INIT_POINTER
---
 drivers/net/vxlan.c |    9 +++------
 include/net/sock.h  |    5 +++++
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index d1292fe..2ef5b62 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -952,8 +952,7 @@ void vxlan_sock_release(struct vxlan_sock *vs)
 
 	spin_lock(&vn->sock_lock);
 	hlist_del_rcu(&vs->hlist);
-	smp_wmb();
-	vs->sock->sk->sk_user_data = NULL;
+	rcu_assign_sk_user_data(vs->sock->sk, NULL);
 	vxlan_notify_del_rx_port(sk);
 	spin_unlock(&vn->sock_lock);
 
@@ -1048,8 +1047,7 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 
 	port = inet_sk(sk)->inet_sport;
 
-	smp_read_barrier_depends();
-	vs = (struct vxlan_sock *)sk->sk_user_data;
+	vs = rcu_dereference_sk_user_data(sk);
 	if (!vs)
 		goto drop;
 
@@ -2302,8 +2300,7 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
 	atomic_set(&vs->refcnt, 1);
 	vs->rcv = rcv;
 	vs->data = data;
-	smp_wmb();
-	vs->sock->sk->sk_user_data = vs;
+	rcu_assign_sk_user_data(vs->sock->sk, vs);
 
 	spin_lock(&vn->sock_lock);
 	hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
diff --git a/include/net/sock.h b/include/net/sock.h
index 6ba2e7b..1d37a80 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
-- 
1.7.1

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