Re: [PATCH 1/4] veth: move loopback logic to common location

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Eric W. Biederman wrote:
> Patrick McHardy <kaber@xxxxxxxxx> writes:
> 
>> In the layered case (macvlan -> eth0) its common behaviour to
>> keep the mark however. But in case of different namespaces,
>> I think macvlan should also clear the mark on the dev_queue_xmit()
>> path since this is just a shortcut to looping the packets
>> through veth. In fact probably both of them should also clear
>> skb->priority so other namespaces don't accidentally misclassify
>> packets.
> 
> That is why I pushed for what is becoming dev_forward_skb.  So that
> we have one place where we can make all of those tweaks.  It seems
> like in every review we find another field that should be cleared/handled
> specially.
> 
> I don't quite follow what you intend with dev_queue_xmit when the macvlan
> is in one namespace and the real physical device is in another.  Are
> you mentioning that the packet classifier runs in the namespace where
> the primary device lives with packets from a different namespace?

Exactly. And I think we should make sure that the namespace of
the macvlan device can't (deliberately or accidentally) cause
misclassification.
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