2 # Copyright (C) 2006 OpenWrt.org
4 ## Please make changes in /etc/firewall.user
11 for T in filter nat; do
16 iptables -N input_rule
17 iptables -N output_rule
18 iptables -N forwarding_rule
20 iptables -t nat -N prerouting_rule
21 iptables -t nat -N postrouting_rule
24 ### (connections with the router as destination)
27 iptables -P INPUT DROP
28 iptables -A INPUT -m state --state INVALID -j DROP
29 iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
30 iptables -A INPUT -p tcp --tcp-flags SYN SYN --tcp-option \! 2 -j DROP
33 # insert accept rule or to jump to new accept-check table here
35 iptables -A INPUT -j input_rule
38 [ -z "$WAN" ] || iptables -A INPUT -i \! $WAN -j ACCEPT # allow from lan/wifi interfaces
39 iptables -A INPUT -p icmp -j ACCEPT # allow ICMP
40 iptables -A INPUT -p gre -j ACCEPT # allow GRE
42 # reject (what to do with anything not allowed earlier)
43 iptables -A INPUT -p tcp -j REJECT --reject-with tcp-reset
44 iptables -A INPUT -j REJECT --reject-with icmp-port-unreachable
47 ### (connections with the router as source)
50 iptables -P OUTPUT DROP
51 iptables -A OUTPUT -m state --state INVALID -j DROP
52 iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
55 # insert accept rule or to jump to new accept-check table here
57 iptables -A OUTPUT -j output_rule
60 iptables -A OUTPUT -j ACCEPT #allow everything out
62 # reject (what to do with anything not allowed earlier)
63 iptables -A OUTPUT -p tcp -j REJECT --reject-with tcp-reset
64 iptables -A OUTPUT -j REJECT --reject-with icmp-port-unreachable
67 ### (connections routed through the router)
70 iptables -P FORWARD DROP
71 iptables -A FORWARD -m state --state INVALID -j DROP
72 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
73 iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
76 # insert accept rule or to jump to new accept-check table here
78 iptables -A FORWARD -j forwarding_rule
81 iptables -A FORWARD -i br0 -o br0 -j ACCEPT
82 [ -z "$WAN" ] || iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT
84 # reject (what to do with anything not allowed earlier)
85 # uses the default -P DROP
88 iptables -t nat -A PREROUTING -j prerouting_rule
89 iptables -t nat -A POSTROUTING -j postrouting_rule
90 [ -z "$WAN" ] || iptables -t nat -A POSTROUTING -o $WAN -j MASQUERADE
93 [ -f /etc/firewall.user ] && . /etc/firewall.user
94 [ -n "$WAN" -a -e /etc/config/firewall ] && {
95 awk -f /usr/lib/common.awk -f /usr/lib/firewall.awk /etc/config/firewall | ash