openvswitch: Reset tunnel key between input and output.

It doesn't make sense to output a tunnel packet using the same
parameters that it was received with since that will generally
just result in the packet going back to us. As a result, userspace
assumes that the tunnel key is cleared when transitioning through
the switch. In the majority of cases this doesn't matter since a
packet is either going to a tunnel port (in which the key is
overwritten with new values) or to a non-tunnel port (in which
case the key is ignored). However, it's theoreticaly possible that
userspace could rely on the documented behavior, so this corrects
it.

Signed-off-by: Jesse Gross <jesse@nicira.com>

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 22c5f39..ab101f7 100644 (file)
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -535,6 +535,7 @@ int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb)
 {
        struct sw_flow_actions *acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
 
+       OVS_CB(skb)->tun_key = NULL;
        return do_execute_actions(dp, skb, acts->actions,
                                         acts->actions_len, false);
 }