*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT DROP [0:0]

# Allow related/established traffic
-A INPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT
# Allow traffic on local loopback
-A INPUT -i lo -j ACCEPT
# Allow ICMP packets
-A INPUT -p icmp -j ACCEPT
# Allow connections to Tor Proxy
-A INPUT -p tcp --dport 9050 -m state --state NEW -j ACCEPT
-A INPUT -p udp --dport 5353 -m state --state NEW -j ACCEPT
# Log dropped packets
#-A INPUT -j LOG --log-prefix "Dropped INPUT packet: " --log-level 7 --log-uid
-A INPUT -p tcp -d 172.16.16.101/32 --dport 3000 -m state --state NEW -j ACCEPT

# Don't allow any packet forwarding

# Block invalid traffic
-A OUTPUT -m state --state INVALID -j DROP
# Allow related/established traffic
-A OUTPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT
# Allow outbound connection for the tor-router user to the Tor directory servers and network
-A OUTPUT -m owner -o eth0 --uid-owner 100 -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m state --state NEW -j ACCEPT
# Allow traffic on local loopback
-A OUTPUT -d 127.0.0.1/32 -o lo -j ACCEPT
# Allow connections to local transparent listener
-A OUTPUT -d 127.0.0.1/32 -p tcp --syn --dport 9040 -j ACCEPT
# Log all other dropped packets
#-A OUTPUT -j LOG --log-prefix "Dropped OUTPUT packet: " --log-level 7 --log-uid
-A OUTPUT -s 172.16.16.101/32 -p tcp --syn --sport 3000 -j ACCEPT

COMMIT

*nat
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]

# Skip pre-routing if interface is WAN or local
-A PREROUTING -i eth0 -j RETURN
-A PREROUTING -i lo -j RETURN
# Redirect all .onion addresses
-A PREROUTING -d 10.192.0.0/10 -p tcp --syn -j REDIRECT --to-ports 9040
# Redirect UDP DNS traffic to internal DNS server
-A PREROUTING -p udp --dport 5353 -j REDIRECT --to-ports 5353
-A PREROUTING -p udp --dport 53 -j REDIRECT --to-ports 5353
# Skip pre-routing if destination is private or reserved
-A PREROUTING -d 0.0.0.0/8,10.0.0.0/8,100.64.0.0/10,127.0.0.0/8,169.254.0.0/16,172.16.0.0/12,192.0.0.0/24,192.0.2.0/24,192.88.99.0/24,192.168.0.0/16,198.18.0.0/15,198.51.100.0/24,203.0.113.0/24,224.0.0.0/4,240.0.0.0/4,255.255.255.255/32 -j RETURN
# Redirect remaining TCP traffic
-A PREROUTING -p tcp --syn -j REDIRECT --to-ports 9040

# Redirect all .onion addresses
-A OUTPUT -d 10.192.0.0/10 -p tcp --syn -j REDIRECT --to-ports 9040
# Redirect all DNS traffic
-A OUTPUT -p udp --dport 53 -j REDIRECT --to-ports 5353
# Allow the tor-router to bypass transparent routing
-A OUTPUT -m owner --uid-owner 100 -j RETURN
# Don't transparently redirect traffic out of the loopback
-A OUTPUT -o lo -j RETURN
# Don't redirect if destination is private or reserved
-A OUTPUT -d 0.0.0.0/8,10.0.0.0/8,100.64.0.0/10,127.0.0.0/8,169.254.0.0/16,172.16.0.0/12,192.0.0.0/24,192.0.2.0/24,192.88.99.0/24,192.168.0.0/16,198.18.0.0/15,198.51.100.0/24,203.0.113.0/24,224.0.0.0/4,240.0.0.0/4,255.255.255.255/32 -j RETURN
# Redirect remaining TCP traffic
-A OUTPUT -p tcp --syn -j REDIRECT --to-ports 9040

COMMIT