fix kmod-sched build on 2.4
[openwrt/svn-archive/archive.git] / openwrt / package / iptables / files / firewall.init
1 #!/bin/sh
2
3 ## Please make changes in /etc/firewall.user
4
5 . /etc/config/network
6 WAN="$wan_ifname"
7 LAN="$lan_ifname"
8
9 ## CLEAR TABLES
10 for T in filter nat; do
11 iptables -t $T -F
12 iptables -t $T -X
13 done
14
15 iptables -N input_rule
16 iptables -N output_rule
17 iptables -N forwarding_rule
18
19 iptables -t nat -N prerouting_rule
20 iptables -t nat -N postrouting_rule
21
22 ### INPUT
23 ### (connections with the router as destination)
24
25 # base case
26 iptables -P INPUT DROP
27 iptables -A INPUT -m state --state INVALID -j DROP
28 iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
29 iptables -A INPUT -p tcp --tcp-flags SYN SYN --tcp-option \! 2 -j DROP
30
31 #
32 # insert accept rule or to jump to new accept-check table here
33 #
34 iptables -A INPUT -j input_rule
35
36 # allow
37 [ -z "$WAN" ] || iptables -A INPUT -i \! $WAN -j ACCEPT # allow from lan/wifi interfaces
38 iptables -A INPUT -p icmp -j ACCEPT # allow ICMP
39 iptables -A INPUT -p gre -j ACCEPT # allow GRE
40
41 # reject (what to do with anything not allowed earlier)
42 iptables -A INPUT -p tcp -j REJECT --reject-with tcp-reset
43 iptables -A INPUT -j REJECT --reject-with icmp-port-unreachable
44
45 ### OUTPUT
46 ### (connections with the router as source)
47
48 # base case
49 iptables -P OUTPUT DROP
50 iptables -A OUTPUT -m state --state INVALID -j DROP
51 iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
52
53 #
54 # insert accept rule or to jump to new accept-check table here
55 #
56 iptables -A OUTPUT -j output_rule
57
58 # allow
59 iptables -A OUTPUT -j ACCEPT #allow everything out
60
61 # reject (what to do with anything not allowed earlier)
62 iptables -A OUTPUT -p tcp -j REJECT --reject-with tcp-reset
63 iptables -A OUTPUT -j REJECT --reject-with icmp-port-unreachable
64
65 ### FORWARDING
66 ### (connections routed through the router)
67
68 # base case
69 iptables -P FORWARD DROP
70 iptables -A FORWARD -m state --state INVALID -j DROP
71 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
72 iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
73
74 #
75 # insert accept rule or to jump to new accept-check table here
76 #
77 iptables -A FORWARD -j forwarding_rule
78
79 # allow
80 iptables -A FORWARD -i br0 -o br0 -j ACCEPT
81 [ -z "$WAN" ] || iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT
82
83 # reject (what to do with anything not allowed earlier)
84 # uses the default -P DROP
85
86 ### MASQ
87 iptables -t nat -A PREROUTING -j prerouting_rule
88 iptables -t nat -A POSTROUTING -j postrouting_rule
89 [ -z "$WAN" ] || iptables -t nat -A POSTROUTING -o $WAN -j MASQUERADE
90
91 ## USER RULES
92 [ -f /etc/firewall.user ] && . /etc/firewall.user
93 [ -n "$WAN" -a -e /etc/config/firewall ] && {
94 awk -f /usr/lib/common.awk -f /usr/lib/firewall.awk /etc/config/firewall | ash
95 }