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[openwrt/svn-archive/archive.git] / package / iptables / files / firewall.init
1 #!/bin/sh /etc/rc.common
2 # Copyright (C) 2006 OpenWrt.org
3
4 ## Please make changes in /etc/firewall.user
5 START=45
6 start() {
7 include /lib/network
8 scan_interfaces
9
10 config_get WAN wan ifname
11 config_get WANDEV wan device
12 config_get LAN lan ifname
13
14 ## CLEAR TABLES
15 for T in filter nat; do
16 iptables -t $T -F
17 iptables -t $T -X
18 done
19
20 iptables -N input_rule
21 iptables -N input_wan
22 iptables -N output_rule
23 iptables -N forwarding_rule
24 iptables -N forwarding_wan
25
26 iptables -t nat -N NEW
27 iptables -t nat -N prerouting_rule
28 iptables -t nat -N prerouting_wan
29 iptables -t nat -N postrouting_rule
30
31 iptables -N LAN_ACCEPT
32 [ -z "$WAN" ] || iptables -A LAN_ACCEPT -i "$WAN" -j RETURN
33 [ -z "$WANDEV" -o "$WANDEV" = "$WAN" ] || iptables -A LAN_ACCEPT -i "$WANDEV" -j RETURN
34 iptables -A LAN_ACCEPT -j ACCEPT
35
36 ### INPUT
37 ### (connections with the router as destination)
38
39 # base case
40 iptables -P INPUT DROP
41 iptables -A INPUT -m state --state INVALID -j DROP
42 iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
43 iptables -A INPUT -p tcp --tcp-flags SYN SYN --tcp-option \! 2 -j DROP
44
45 #
46 # insert accept rule or to jump to new accept-check table here
47 #
48 iptables -A INPUT -j input_rule
49 [ -z "$WAN" ] || iptables -A INPUT -i $WAN -j input_wan
50
51 # allow
52 iptables -A INPUT -j LAN_ACCEPT # allow from lan/wifi interfaces
53 iptables -A INPUT -p icmp -j ACCEPT # allow ICMP
54 iptables -A INPUT -p gre -j ACCEPT # allow GRE
55
56 # reject (what to do with anything not allowed earlier)
57 iptables -A INPUT -p tcp -j REJECT --reject-with tcp-reset
58 iptables -A INPUT -j REJECT --reject-with icmp-port-unreachable
59
60 ### OUTPUT
61 ### (connections with the router as source)
62
63 # base case
64 iptables -P OUTPUT DROP
65 iptables -A OUTPUT -m state --state INVALID -j DROP
66 iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
67
68 #
69 # insert accept rule or to jump to new accept-check table here
70 #
71 iptables -A OUTPUT -j output_rule
72
73 # allow
74 iptables -A OUTPUT -j ACCEPT #allow everything out
75
76 # reject (what to do with anything not allowed earlier)
77 iptables -A OUTPUT -p tcp -j REJECT --reject-with tcp-reset
78 iptables -A OUTPUT -j REJECT --reject-with icmp-port-unreachable
79
80 ### FORWARDING
81 ### (connections routed through the router)
82
83 # base case
84 iptables -P FORWARD DROP
85 iptables -A FORWARD -m state --state INVALID -j DROP
86 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
87 iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
88
89 #
90 # insert accept rule or to jump to new accept-check table here
91 #
92 iptables -A FORWARD -j forwarding_rule
93 [ -z "$WAN" ] || iptables -A FORWARD -i $WAN -j forwarding_wan
94
95 # allow
96 iptables -A FORWARD -i $LAN -o $LAN -j ACCEPT
97 [ -z "$WAN" ] || iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT
98
99 # reject (what to do with anything not allowed earlier)
100 # uses the default -P DROP
101
102 ### MASQ
103 iptables -t nat -A PREROUTING -m state --state NEW -j NEW
104 iptables -t nat -A PREROUTING -j prerouting_rule
105 [ -z "$WAN" ] || iptables -t nat -A PREROUTING -i "$WAN" -j prerouting_wan
106 iptables -t nat -A POSTROUTING -j postrouting_rule
107 [ -z "$WAN" ] || iptables -t nat -A POSTROUTING -o $WAN -j MASQUERADE
108
109 iptables -t nat -A NEW -m limit --limit 50 --limit-burst 100 -j RETURN && \
110 iptables -t nat -A NEW -j DROP
111
112 ## USER RULES
113 [ -f /etc/firewall.user ] && . /etc/firewall.user
114 [ -n "$WAN" -a -e /etc/config/firewall ] && {
115 export WAN
116 awk -f /usr/lib/common.awk -f /usr/lib/firewall.awk /etc/config/firewall | ash
117 }
118 }
119
120 stop() {
121 iptables -P INPUT ACCEPT
122 iptables -P OUTPUT ACCEPT
123 iptables -P FORWARD ACCEPT
124 iptables -F
125 iptables -X
126 iptables -t nat -P PREROUTING ACCEPT
127 iptables -t nat -P POSTROUTING ACCEPT
128 iptables -t nat -P OUTPUT ACCEPT
129 iptables -t nat -F
130 iptables -t nat -X
131 }