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