JPsiotp/sio1/siotp/sisr1/TP7/scriptsnft/fw_part3.nft

define netif = enp0s3
define dmzif = enp0s8
define lanif = enp0s9
define netip = 192.168.0.140
define dmzip = 172.16.0.254
define lanip = 10.0.0.254

table ip ipfilter{
	chain prerouting {
		type filter hook prerouting priority filter; policy drop;
		icmp type echo-request iif $lanif ip daddr 172.16.0.1-172.16.0.254 accept
		icmp type echo-request iif $lanif ip daddr $lanip accept
		icmp type echo-reply accept
		tcp dport 22 accept
	}
	chain system_in {
		type filter hook input priority filter; policy drop;
		icmp type echo-request iif $lanif accept
		icmp type echo-reply accept
		tcp dport 22 accept
	}
	chain routing {
		type filter hook forward priority filter; policy drop;
		icmp type echo-request iif $lanif oif $dmzif accept
		icmp type echo-reply iif $dmzif oif $lanif accept
	}
	chain system_out {
		type filter hook output priority filter; policy drop;
		icmp type echo-request accept
		icmp type echo-reply oif $lanif accept
		tcp sport 22 accept
	}
	chain postrouting {
		type filter hook postrouting priority filter; policy drop;
		icmp type echo-request ip saddr {$lanip , $dmzip , $netip } accept
		icmp type echo-request iif $lanif oif $dmzif accept
		icmp type echo-reply iif $dmzif oif $lanif accept
		icmp type echo-reply ip saddr $lanip oif $lanif accept
		tcp sport 22 accept
	}
}