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-rwxr-xr-xpackage/iptables/files/firewall.init142
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diff --git a/package/iptables/files/firewall.init b/package/iptables/files/firewall.init
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--- a/package/iptables/files/firewall.init
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-#!/bin/sh /etc/rc.common
-# Copyright (C) 2006 OpenWrt.org
-
-## Please make changes in /etc/firewall.user
-START=45
-start() {
- include /lib/network
- scan_interfaces
-
- config_get WAN wan ifname
- config_get WANDEV wan device
- config_get LAN lan ifname
- config_get_bool NAT_LAN lan nat 1
- if [ $NAT_LAN -ne 0 ]
- then
- config_get LAN_MASK lan netmask
- config_get LAN_IP lan ipaddr
- LAN_NET=$(/bin/ipcalc.sh $LAN_IP $LAN_MASK | grep NETWORK | cut -d= -f2)
- fi
-
- ## CLEAR TABLES
- for T in filter nat; do
- iptables -t $T -F
- iptables -t $T -X
- done
-
- iptables -N input_rule
- iptables -N input_wan
- iptables -N output_rule
- iptables -N forwarding_rule
- iptables -N forwarding_wan
-
- iptables -t nat -N NEW
- iptables -t nat -N prerouting_rule
- iptables -t nat -N prerouting_wan
- iptables -t nat -N postrouting_rule
-
- iptables -N LAN_ACCEPT
- [ -z "$WAN" ] || iptables -A LAN_ACCEPT -i "$WAN" -j RETURN
- [ -z "$WANDEV" -o "$WANDEV" = "$WAN" ] || iptables -A LAN_ACCEPT -i "$WANDEV" -j RETURN
- iptables -A LAN_ACCEPT -j ACCEPT
-
- ### INPUT
- ### (connections with the router as destination)
-
- # base case
- iptables -P INPUT DROP
- iptables -A INPUT -m state --state INVALID -j DROP
- iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
- iptables -A INPUT -p tcp --tcp-flags SYN SYN --tcp-option \! 2 -j DROP
-
- #
- # insert accept rule or to jump to new accept-check table here
- #
- iptables -A INPUT -j input_rule
- [ -z "$WAN" ] || iptables -A INPUT -i $WAN -j input_wan
-
- # allow
- iptables -A INPUT -j LAN_ACCEPT # allow from lan/wifi interfaces
- iptables -A INPUT -p icmp -j ACCEPT # allow ICMP
- iptables -A INPUT -p gre -j ACCEPT # allow GRE
-
- # reject (what to do with anything not allowed earlier)
- iptables -A INPUT -p tcp -j REJECT --reject-with tcp-reset
- iptables -A INPUT -j REJECT --reject-with icmp-port-unreachable
-
- ### OUTPUT
- ### (connections with the router as source)
-
- # base case
- iptables -P OUTPUT DROP
- iptables -A OUTPUT -m state --state INVALID -j DROP
- iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-
- #
- # insert accept rule or to jump to new accept-check table here
- #
- iptables -A OUTPUT -j output_rule
-
- # allow
- iptables -A OUTPUT -j ACCEPT #allow everything out
-
- # reject (what to do with anything not allowed earlier)
- iptables -A OUTPUT -p tcp -j REJECT --reject-with tcp-reset
- iptables -A OUTPUT -j REJECT --reject-with icmp-port-unreachable
-
- ### FORWARDING
- ### (connections routed through the router)
-
- # base case
- iptables -P FORWARD DROP
- iptables -A FORWARD -m state --state INVALID -j DROP
- iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
- iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
-
- #
- # insert accept rule or to jump to new accept-check table here
- #
- iptables -A FORWARD -j forwarding_rule
- [ -z "$WAN" ] || iptables -A FORWARD -i $WAN -j forwarding_wan
-
- # allow
- iptables -A FORWARD -i $LAN -o $LAN -j ACCEPT
- [ -z "$WAN" ] || iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT
-
- # reject (what to do with anything not allowed earlier)
- # uses the default -P DROP
-
- ### MASQ
- iptables -t nat -A PREROUTING -m state --state NEW -p tcp -j NEW
- iptables -t nat -A PREROUTING -j prerouting_rule
- [ -z "$WAN" ] || iptables -t nat -A PREROUTING -i "$WAN" -j prerouting_wan
- iptables -t nat -A POSTROUTING -j postrouting_rule
- ### Only LAN, unless told not to
- if [ $NAT_LAN -ne 0 ]
- then
- [ -z "$WAN" ] || iptables -t nat -A POSTROUTING --src $LAN_NET/$LAN_MASK -o $WAN -j MASQUERADE
- fi
-
- iptables -t nat -A NEW -m limit --limit 50 --limit-burst 100 -j RETURN && \
- iptables -t nat -A NEW -j DROP
-
- ## USER RULES
- [ -f /etc/firewall.user ] && . /etc/firewall.user
- [ -n "$WAN" -a -e /etc/firewall.config ] && {
- export WAN
- awk -f /usr/lib/common.awk -f /usr/lib/firewall.awk /etc/firewall.config | ash
- }
-}
-
-stop() {
- iptables -P INPUT ACCEPT
- iptables -P OUTPUT ACCEPT
- iptables -P FORWARD ACCEPT
- iptables -F
- iptables -X
- iptables -t nat -P PREROUTING ACCEPT
- iptables -t nat -P POSTROUTING ACCEPT
- iptables -t nat -P OUTPUT ACCEPT
- iptables -t nat -F
- iptables -t nat -X
-}