Exact Definition of numbers-match bitmask-match and fragmentation-type

[Tim Weippert]

Hi Matt, 

On Sun, Apr 04, 2021 at 12:18:53PM -0400, Matt Corallo wrote:
> For context, I'm currently writing a birdc-flowspec -> XDP
> parser/transpiler, so exact formal grammar and behavior is important :). You
> can find it at https://github.com/TheBlueMatt/flowspec-xdp.

Looks interesting.

> It currently only supports drop/pass, however, and doesn't parse the action
> communities as it doesn't appear BIRD supports them? The RFC indicates
> extended community types in the 0x800X range, but BIRD appears to only
> support rt/ro. I may be missing something entirely obvious here, though.

You can add the exetended communities via generic extended communitiy in
bird:

bgp_ext_community.add( (generic, 0x80060000, 0x00000000 ) );

the output in birdc will look like:

flow4 { dst 203.0.113.53/32; src 198.51.100.10/32; }  [S_FLOWSPEC_v4 07:48:34.659] * (200)
        Type: static univ
        BGP.ext_community: (generic, 0x80060000, 0x0)

HTH, 
tim


-- 
Tim Weippert
http://weiti.org - weiti at weiti.org
GPG Fingerprint - E704 7303 6FF0 8393 ADB1  398E 67F2 94AE 5995 7DD8