29.10.2014 09:46, Eric Dumazet wrote:

...

quoted

The fallback device can not be hidden from the packet receiver
as a regular tunnel, but there is no need for synchronization
as long as we do single assignment.

This is not exact, I believe you need to add following changes :

Thank you, Eric, you're right, I missed that.
I'll repost the patch with your changes applied.

-- 
Best regards,
Alexey