[PATCH v6] Babel: Replace internal route selection by bird's nest

[Lars Gierth]

Hi all,

happy new year and thanks for the fresh releases!

We have been successfully running the Babel route selection patch [1] 
with Bird 2.17 in our community mesh network with ~200 Babel nodes since 
Q3/2024. It has allowed us to really fine-tune a mix of all kinds of 
wire types connecting the locations: wifi at 60 / 5 / 2 GHz, tunnels 
over LTE or DSL, fiber in a datacenter, etc. etc. With Babel being a 
critical part of our network, the patch is running on a broad range of 
architectures: mips, ppc64, x86_64, and various arm and aarch64 types.

With dxld's consent I took his patch and rebased it on Bird 3.1, and 
we've been testing that for 2 months on the live network. Today I 
rebased it on 3.2 (thread-next branch), it applied cleanly but I haven't 
tested it yet. Nevertheless I decided to share it now, see attachment.

Kind regards,
Lars
Freifunk Berlin

[1] https://bird.network.cz/pipermail/bird-users/2023-February/016705.html
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