I'm not sure what the problem you're having is... This is
exactly what Firewall Builder (fwbuilder) does when you build rules
using it... In my case a quick 'grep ^iptables rules.fw |awk '{print
$3}' |sort |uniq' results in 43 chains including the standard 3...
Jeremy
On Tue, May 07, 2002 at 12:50:19PM -0700, David Wright wrote:
>
> I am building a firewall with iptables. There are some checks I'd like to
> occur on multiple chains. I'd like to arrange these as a "subroutine
> chain", i.e. a chain that is called and then returns to the calling chain
> if the packet makes it to the end. Schematically...
>
> iptables -A FORWARD -j CHECKS
> iptables -A INPUT -j CHECKS
>
> iptables -A CHECKS ...
> iptables -A CHECKS ...
> iptables -A CHECKS -j RETURN
>
> Yes, I know I can make it work by just reproducing the CHECKS rules in
> each chain, but that's not good programming practice.
>
>
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