define netif = enp0s3
define lanif = enp0s8
define dmzif = enp0s9

define netip = 192.168.0.140
define dmzip = 172.17.0.254
define lanip = 172.16.0.254

define lan-ntw = 172.16.0.1-172.16.0.254
define dmz-ntw = 172.17.0.1-172.17.0.254
define 

define internal-dns-ip= 172.16.0.1
define dns-forwarder-ip= 10.121.38.7

table ip ipfilter{
	chain prerouting {
                type filter hook prerouting priority filter; policy drop;
                ct state established,related accept
		tcp dport 22 accept
                tcp dport {80,443} iif $lanif accept
                icmp type echo-request iif $lanif accept
		icmp type echo-reply iif {$lanif, $dmzif} accept
                tcp dport 53 accept 
                #requetes externe dns 
                ip saddr $internal-dns-ip ip daddr $dns-forwarder-ip accept



        }
	chain system_in {
                type filter hook input priority filter; policy drop;
                ct state established,related accept
		tcp dport 22 accept
                icmp type echo-request iif $lanif accept
		icmp type echo-reply accept

        }
 	chain routing {
                type filter hook forward priority filter; policy drop;
                ct state established,related accept
                icmp type echo-request iif $lanif oif $dmzif accept
		icmp type echo-reply iif $dmzif oif $lanif accept
                tcp dport {80,443} iif $lanif accept
                tcp dport 53 accept 
                #requetes externe dns 
                ip saddr $internal-dns-ip ip daddr $dns-forwarder-ip accept 
        }
 	chain system_out {
                type filter hook output priority filter; policy drop;
                ct state established,related accept
                tcp sport 22 accept #ssh 
                #proxy lycée
                tcp dport 8080 accept 
                udp dport 53 accept #dns
                tcp dport {20,21} accept #ftp #tcp 
                tcp dport {80,443} accept #http,https
                icmp type echo-request accept
		icmp type echo-reply oif $lanif accept
        }
	chain postrouting {
                type filter hook postrouting priority filter; policy drop;
                ct state established,related accept
                tcp sport 22 accept
                tcp dport 8080 accept 
                udp dport 53 accept #dns
                tcp dport {20,21} accept #ftp,tcp 
                tcp dport {80,443} accept #http,https
                icmp type echo-request oif {$lanif, $dmzif} accept
		icmp type echo-reply oif $lanif accept
                tcp dport 53 accept 
                #requetes externe dns 
                ip saddr $internal-dns-ip ip daddr $dns-forwarder-ip accept 
        }
        chain nat_prerouting {
                type nat hook prerouting priority filter; policy accept;
                ip daddr $netip tcp dport {80,443}
                dnat to $srv-web-ip 
                ip daddr $netip tcp dport 2222 dnat to $srv-web-ip:22

        }
        chain nat_postrouting {
               type nat hook postrouting priority filter; policy accept;
                ip saddr $lan-ntw oif $netif snat $netip
        }
}