Defines for mixed IPv6/IPv4

[Luiz Amaral]

Hello Nico,

I make separate defines per family (like you did) and then in my filters 
I just use:
     if (net.type = NET_IP4 && ! (net ~ ASxxx_IPV4)) then reject;
     if (net.type = NET_IP6 && ! (net ~ ASxxx_IPV6)) then reject;

Best,
Luiz

On 23/01/2024 14:13, Nico Schottelius via Bird-users wrote:
> Hello bird users,
>
> I am wondering how you handle matching both IPv6 and IPv4 prefixes
> efficiently.
>
> We have tons of blocks in our config like these:
>
> define net_genauso_v6 = [
>         2a0a:5480::/29+
> ];
>
> define net_genauso_v4 = [
>         185.203.113.0/24,
>         185.116.114.0/24
> ];
>
> And then later we have a function that combines them like this:
>
> function is_genauso() -> bool
> {
>    if ((net ~ net_genauso_v6) ||
>        (net ~ net_genauso_v4)) then {
>        return true;
>    }
>
>    return false;
> }
>
> And then much later, we have various filters utilising the function, the
> most simple one being:
>
> filter genauso {
>    if(is_genauso()) then accept;
>    reject;
> }
>
> Which is then used in both IPv4 & IPv6 channels:
>
> protocol bgp incoming_r2ge {
>      ...
>
>      ipv6 {
>        import filter genauso;
>        export none;
>      };
>
>      ipv4 {
>        import filter genauso;
>        export none;
>        extended next hop on;
>      };
> }
>
>
> Instead of writing a wrapper function for each peer/constellation, it
> would be great if we could do something like that:
>
> define net_genauso = [
>         2a0a:5480::/29+,
>         185.203.113.0/24,
>         185.116.114.0/24
>         ];
>
> ...
> filter genauso {
>    if(net ~ net_genauso) then accept;
>    reject;
> }
> ...
>
> However as of bird 2.14, this results in the following error:
>
> bridge:~nico# bird -f -c ./bird.conf
> bird: ./bird.conf:208:23 Mixed IPv4/IPv6 prefixes in prefix set.
>
> So my question is, how do you usually match on the two families? Do you
> also write a wrapper function like above? Or do you have a smarter way?
>
> BR,
>
> Nico
>
> --
> Sustainable and modern Infrastructures by ungleich.ch