Re: filter in filter

4 Feb 2013


      Hi Tapio,

On 02/04/2013 04:29 PM, Tapio Haapala wrote:
...
Yaw dawg,
Can I put filter in filter?
I mean that if I have:
filter own_net
{
         if net ~ [1.2.3.0/24] then accept;
         reject;
}
Can I somehow include that to:
filter bgp_net
{
         if source = RTS_BGP then accept;
       #some kind reference to own_net filter here.
         reject;
}
I try find right syntax from documentation but I did not find it.
You can define functions, which can be used in filters. This way you can 
create the functionality you're looking for.

On this page a bunch of examples are shown:
https://redmine.labs.nic.cz/projects/bird/wiki/BGP_filtering

e.g. (untested):

function own_net
{
     return net ~ [1.2.3.0/24];
}

filter bgp_net
{
     if source = RTS_BGP then accept;
     if own_net() then accept;
     reject;
}

-- 
Hans van Kranenburg - System / Network Engineer
+31 (0)10 2760434 | hans.van.kranenburg@mendix.com | www.mendix.com