First of all, your question isn't a Perl question. It's a Linux question, and you're far more likely to get a useful answer on a Linux or a Linux networking forum than you will be getting here.
Having said that, I don't think iptables has anything build in that does a callback. Depending on what you're defending against, you could place a wrapper around the various /sbin/iptables* programs; replace said programs with ones you wrote yourself, or hack the kernel.
But again, there's nothing Perl specific in either the question, or the answer.
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