I couldn't find any examples of such a thing, but it could be useful for some virtual drivers that are not really 
Ethernet in nature for which wrapping and unwrapping the packets in Ethernet headers is merely unnecessary overhead.

I assume such a driver couldn't use struct ethercom and the corresponding ether_* methods. What would replace them? Is 
it possible to use tun sources as a reference to how this could be implemented?

An example would be perfect, but even a pointer in the direction of a solution would be appreciated.

Thanks, Max