ext_if="sis0"
int_if="tap0" 
wifi_if="wlan0"
all_node="172.31.255.1/32"

wl_net="172.16.0.0/12"
vpn_net="172.17.64.0/28"

publicnat="{80, 443, 22}"
allow_ext_tcp="{22}"
allow_ext_udp="{161}"
allow_int_tcp="{22,53,80,3128}"
allow_int_udp="{53,131,161,12345}"
allow_int_udp_any="{67}"

private="{ 10.0.0.0/8 , 192.168.0.0/16 }"

# Nat the internet
nat on $ext_if from $wl_net to any port $publicnat -> ($ext_if) 

# Nat local wl access
nat on $int_if from $private to $wl_net -> ($int_if)

# Block all
block in on $ext_if
pass in on $int_if

# Allow wl access from access point (not yet reversed)
pass on $wifi_if from $wl_net to $wl_net

# Block this device from wifi
block in on $wifi_if inet from any to $wifi_if
block inet from any to $all_node

# Enable me to access anything
pass out on {$ext_if, $int_if, $wifi_if} keep state

# Allow internet access from the network
pass in on $wifi_if inet proto tcp from $wl_net to any port $publicnat keep state
block in on $wifi_if inet proto tcp from $wl_net to $wifi_if port $publicnat
block in on $wifi_if inet proto tcp from $wl_net to $all_node port $publicnat

# Allow directives 
pass in on $ext_if inet proto tcp from any to $ext_if port $allow_ext_tcp keep state
pass in on $ext_if inet proto udp from any to $ext_if port $allow_ext_udp keep state

pass in on $int_if inet proto tcp from $wl_net to $vpn_net port $allow_int_tcp keep state
pass in on $int_if inet proto udp from $wl_net to $vpn_net port $allow_int_udp keep state
pass in on $int_if inet proto icmp from $wl_net to $vpn_net keep state
pass in on $int_if inet proto udp from any to any port $allow_int_udp_any keep state

pass in on $wifi_if inet proto tcp from $wl_net to $wl_net port $allow_int_tcp keep state
pass in on $wifi_if inet proto udp from $wl_net to $wl_net port $allow_int_udp keep state
pass in on $wifi_if inet proto icmp from $wl_net to $wl_net keep state
pass in on $wifi_if inet proto udp from any to any port $allow_int_udp_any keep state

# Allow wl access from local network
pass on $ext_if from $private to $wl_net keep state

# Make sure to block local network access from wl
block on $wifi_if from $wl_net to $private
block on $int_if from $wl_net to $private