# Netfilter rules for public "untrusted" networks
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [0:0]
:DOCKER-USER - [0:0]
-A INPUT -i lo -j ACCEPT
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
# Allow tethered Wifi AP
-A INPUT -i tether -p udp -m conntrack --ctstate NEW -j ACCEPT
-A INPUT -i tether -s 10.0.0.0/8,172.16.0.0/12,192.168.0.0/16 -m conntrack --ctstate NEW -j ACCEPT
-A FORWARD -i tether -s 10.0.0.0/8,172.16.0.0/12,192.168.0.0/16 -m conntrack --ctstate NEW -j ACCEPT
-A FORWARD -i tether -s 10.0.0.0/8,172.16.0.0/12,192.168.0.0/16 -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
-A FORWARD -o tether -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
# Block DOCKER
-A DOCKER-USER -m conntrack --ctstate RELATED,ESTABLISHED -j RETURN
-A DOCKER-USER -j REJECT --reject-with icmp-port-unreachable
COMMIT
*nat
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
COMMIT
*mangle
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
COMMIT