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vxlan: avoid using stale vxlan socket.

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When vxlan device is closed vxlan socket is freed. This
operation can race with vxlan-xmit function which
dereferences vxlan socket. Following patch uses RCU
mechanism to avoid this situation.

Signed-off-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
pravin shelar
2016-10-28 09:59:15 -07:00
committed by David S. Miller
parent 087892d29b
commit c6fcc4fc5f
2 changed files with 52 additions and 32 deletions
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4
include/net/vxlan.h
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@@ -225,9 +225,9 @@ struct vxlan_config {
struct vxlan_dev {
struct hlist_node hlist; /* vni hash table */
struct list_head next; /* vxlan's per namespace list */
struct vxlan_sock *vn4_sock; /* listening socket for IPv4 */
struct vxlan_sock __rcu *vn4_sock; /* listening socket for IPv4 */
#if IS_ENABLED(CONFIG_IPV6)
struct vxlan_sock *vn6_sock; /* listening socket for IPv6 */
struct vxlan_sock __rcu *vn6_sock; /* listening socket for IPv6 */
#endif
struct net_device *dev;
struct net *net; /* netns for packet i/o */