[PATCH] allow setting the 'onlink' route attribute in filters

[Radu CARPA]

Hi bird users,

I recently came across the following thread [1] when trying to build an 
IP-in-IP overlay network with bird. Unfortunately, those patches where 
never merged upstream. Calico still uses a very old fork of bird with 
those patches applied [2].

I decided to try the path that Ondrej proposed in the thread from 2016. 
I made the small change from the attached patch and it worked 
wonderfully for building a dynamically routed IP-in-IP overlay network.

Do you think it will take a lot of work to pass, from this proof of 
concept, to a patch which could be accepted into bird? Is setting 
"onlink" this way a good idea? I'd be happy to work on improving the patch.

Regards,

Radu


[1] https://bird.network.cz/pipermail/bird-users/2016-September/010633.html

[2] https://github.com/projectcalico/bird
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