Patching ng_iface to allow setting the MTU via netgraph API

[Andreas Kempe]

Hello!

I am working on a meshnet concept and am using netgraph to put it right
on top of the MAC layer. I am using ng_iface to do some tunneling of IP
over my protocol and I thought it would be nice to be able to set the
MTU of the created interface using the netgraph interface.

I created a patch to do just that and thought I could share it if
someone would find it worthwhile using for something, but I couldn't
really figure out where to share it. I couldn't really get clarity from
the contribution section in the handbook.

If someone could point me in the right direction, it would be
appreciated. I'll attach the patch to this mail as well since it is a
quite small one.

Cordially,
Andreas Kempe
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