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openvswitch: Reset tunnel key between input and output.

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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>
This commit is contained in:
Jesse Gross 2013-08-14 15:50:36 -07:00
parent 42415c90ce
commit 36bf5cc66d
1 changed files with 1 additions and 0 deletions
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net/openvswitch/actions.c
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@ -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);
}