Netfilter and Forwarding Information Base (FIB)

Hey folks,

I’m struggling to locate a resource online that explains the FIB and Netfilter chain interactions/processing order. I’d like to understand this since kube-proxy is inserting service routes into iptables and felix is inserting routes into the FIB.

Is the FIB simply accessed during the “forwarding” process in iptables?

Regards,
Chuck