# our hosts
define ap1 = 10.42.0.5
define ap2 = 10.42.0.6
define labitat = 185.38.172.72

define spacewand4 = 185.38.175.70
define spacewand6 = 2a01:4262:1ab::cafe

define spacebrain4 = 185.38.175.69
define spacebrain6 = 2a01:4262:1ab::db

define labservers4 = { $spacewand4, $spacebrain4 }
define labservers6 = { $spacewand6, $spacebrain6 }

# internal stuff
define ext_if    = wan
define ext_ip4   = 185.38.175.0
define ext_ip6   = 2a01:4262:1ab::
define int_net4  = 10.42.0.0/16
define ext_net4  = 185.38.175.0/24
define ext_net6  = 2a01:4262:1ab::/48
define link_net4 = 193.106.167.40/29
define link_net6 = 2a03:5440:1:2935:1ab::/120

define adm_if    = lan10
define adm_ip4   = 10.42.0.1
define adm_net4  = 10.42.0.0/24

define wire_if   = lan11
define wire_ip4  = 10.42.1.1
define wire_net4 = 10.42.1.0/24
define wire_net6 = 2a01:4262:1ab:b::/64

define priv_if   = lan12
define priv_ip4  = 10.42.2.1
define priv_net4 = 10.42.2.0/24
define priv_net6 = 2a01:4262:1ab:c::/64

define free_if   = lan13
define free_ip4  = 10.42.3.1
define free_net4 = 10.42.3.0/24
define free_net6 = 2a01:4262:1ab:d::/64

define pass_if   = lan14
define pass_ip4  = 10.42.4.1
define pass_net4 = 10.42.4.0/24
define pass_net6 = 2a01:4262:1ab:e::/64

define serv_if   = lan20
define serv_ip4  = 185.38.175.65
define serv_net4 = 185.38.175.64/24
define serv_net6 = 2a01:4262:1ab:20::/64

define avahi_ifs = { $wire_if, $priv_if, $pass_if }

#define nat64_if   = nat64
#define nat64_net  = 10.42.255.0/24
#define nat64_net6 = fde2:52b4:4a19:ffff::/96

table ip filter {
	chain input {
		type filter hook input priority 0;

		ct state established,related accept
		ct state invalid drop

		# no ping floods
		ip protocol icmp limit rate 100/second accept
		ip protocol icmp drop

		iif lo accept

		# bird etc. on fiberby link
		iif $ext_if ip saddr $link_net4 ip daddr $link_net4 counter accept

		# dhcp
		udp sport bootpc udp dport bootps iif != $ext_if counter accept

		# radius
		iif $adm_if ip saddr { $ap1, $ap2 } udp dport 1812 accept

		# tftp
		iif $wire_if ip saddr $wire_net4 udp dport 69 accept

		# ssh
		tcp dport 22 accept

		# dns
		tcp dport 53 ip saddr { $int_net4, $ext_net4 } accept
		udp dport 53 ip saddr { $int_net4, $ext_net4 } accept

		# avahi
		ip daddr 224.0.0.251 udp dport 5353 iif $avahi_ifs accept
		ip protocol igmp iif $avahi_ifs accept

		## debugging
		#iif $ext_if counter drop
		#udp dport { 137, 138, 5353, 27036 } drop # NetBIOS, Avahi, Steam in-home stream
		#udp sport 17500 udp dport 17500 drop # Dropbox LANsync
		#ip protocol igmp drop                # IGMP
		#counter log prefix "in4: " drop
		drop
	}

	chain forward {
		type filter hook forward priority 0;

		ct state established,related accept
		ct state invalid drop

		# accept all traffic to Labitat servers
		ip daddr $labservers4 accept

		ip saddr $labitat udp dport 161 counter accept # traffic stats

		# no traffic to admin net
		ip daddr $adm_net4 ip saddr $int_net4 reject with icmp type net-prohibited
		ip daddr $adm_net4 drop

		# local traffic
		iif $adm_if  ip saddr $adm_net4  accept
		iif $wire_if ip saddr $wire_net4 accept
		iif $priv_if ip saddr $priv_net4 accept
		iif $free_if ip saddr $free_net4 ip daddr != $int_net4 accept
		iif $pass_if ip saddr $pass_net4 accept
		iif $serv_if ip saddr $serv_net4 accept

		## debugging
		#iif $ext_if counter drop
		#counter log prefix "fw4: " drop
		drop
	}
}

table ip6 filter {
	chain input {
		type filter hook input priority 0;

		ct state established,related accept
		ct state invalid drop

		# no ping floods
		ip6 nexthdr ipv6-icmp limit rate 100/second accept
		ip6 nexthdr ipv6-icmp drop

		iif lo accept
		iif { $adm_if, $wire_if, $priv_if, $free_if, $pass_if } hbh nexthdr ipv6-icmp accept

		# bird etc. on fiberby link
		iif $ext_if ip6 saddr $link_net6 ip6 daddr $link_net6 counter accept

		# ssh
		tcp dport 22 accept

		# dns
		tcp dport 53 ip6 saddr $ext_net6 accept
		udp dport 53 ip6 saddr $ext_net6 accept

		# avahi
		ip6 daddr ff02::fb udp dport 5353 iif $avahi_ifs accept

		## debugging
		#counter log prefix "in6: " drop
		drop
	}

	chain forward {
		type filter hook forward priority 0;

		ct state established,related accept
		ct state invalid drop

		# accept all traffic to Labitat servers
		ip6 daddr $labservers6 accept

		iif $wire_if ip6 saddr $wire_net6 accept
		iif $priv_if ip6 saddr $priv_net6 accept
		iif $free_if ip6 saddr $free_net6 ip6 daddr != $ext_net6 accept
		iif $pass_if ip6 saddr $pass_net6 accept
		iif $serv_if ip6 saddr $serv_net6 accept

		## debugging
		#counter log prefix "fw6: " drop
		drop
	}
}

table ip nat {
	chain portforward {
		ip daddr $ext_ip4 udp dport 161 dnat 10.42.0.9 # traffic stats
	}

	chain prerouting {
		type nat hook prerouting priority -150;
		goto portforward
	}

	chain output {
		type nat hook output priority -150;
		goto portforward
	}

	chain input {
		type nat hook input priority -150;
		# this chain is needed to make dnat from the output chain work
	}

	chain postrouting {
		type nat hook postrouting priority -150;
		oif $ext_if ip saddr $int_net4 snat $ext_ip4
        }
}