[PATCH] IPv4 over IPv6 nexthop support on FreeBSD

[Luiz Amaral]

Hello,

While experimenting in FreeBSD 13.1 with IPv4 over IPv6 nexthop routes, 
I realized that BIRD was unable to read routes from the kernel as well 
as export routes to the kernel. The support for it was implemented in 
FreeBSD 13.1 [1].

I have attached a patch that made it work for me on FreeBSD 13.1, both 
importing and exporting to/from kernel. I believe the patch will still 
need some work, as from a quick look, OpenBSD still has no support for 
it. I'm happy to implement any suggested improvements and send a v2 of it.

Thank you,
Luiz

[1] https://reviews.freebsd.org/D30398
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