+## Permitted special forwarding.
+makeset fwd-allow-http nethash || :
+iptables -A fwd-spec-nofrag -j ACCEPT \
+ -m set --match-set fwd-allow-http dst \
+ -p tcp --destination-port $port_http \
+ -m mark --mark $to_untrusted/$MASK_TO
+iptables -A fwd-spec-nofrag -j ACCEPT \
+ -m set --match-set fwd-allow-http src \
+ -p tcp --destination-port $port_http \
+ -m mark --mark $from_untrusted/$MASK_FROM \
+ -m state --state ESTABLISHED
+