[Cake] conntrack lookup continuation

[Jonathan Morton]

> On 31 Jan, 2017, at 16:49, Felix Resch <fuller at beif.de> wrote:
> 
> Since we now already do the conntrack-lookup for the nat keyword, would it be 
> expensive to implement a kind of internal conntrack-mark-and-restore by cake-tin?
> 
> E.g. when traffic leaves throu canke tin#x, the conntrack entry will get a fwmark and return traffic is put in the corresponding tin/bin on the ingress cake.

That’s an interesting idea.  At this point I don’t know how easy it is to implement, though.

Certainly we need to clean up some other things first.

 - Jonathan Morton