Firewall to router

Hi

this is my network structure:

internet goes to a linksys router with ip 192.168.1.1, i take the router
directly to my firewall with debian, it goes to an eth interface eth0 with ip
192.168.1.100, then with another interface eth1 with ip 192.168.0.100 i take
it to a switch and all my network, so i need that eth1 receive all
comunications of my LAN, drops everything not needed (this is done with
iptables), and if a packet is not droped, i need it to send it to the router
192.168.1.1 with my eth0, how do i do this?

thanks
Rodrigo

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