diff options
Diffstat (limited to 'package/iptables')
| -rwxr-xr-x | package/iptables/files/firewall.init | 206 |
1 files changed, 109 insertions, 97 deletions
diff --git a/package/iptables/files/firewall.init b/package/iptables/files/firewall.init index 4acd325a9..731485bcd 100755 --- a/package/iptables/files/firewall.init +++ b/package/iptables/files/firewall.init @@ -1,103 +1,115 @@ -#!/bin/sh +#!/bin/sh /etc/rc.common # Copyright (C) 2006 OpenWrt.org ## Please make changes in /etc/firewall.user -. /etc/functions.sh -include /lib/network - -scan_interfaces -config_get WAN wan ifname -config_get LAN lan ifname - -## CLEAR TABLES -for T in filter nat; do - iptables -t $T -F - iptables -t $T -X -done - -iptables -N input_rule -iptables -N output_rule -iptables -N forwarding_rule - -iptables -t nat -N prerouting_rule -iptables -t nat -N postrouting_rule - -iptables -N LAN_ACCEPT -[ -z "$WAN" ] || iptables -A LAN_ACCEPT -i "$WAN" -j RETURN -iptables -A LAN_ACCEPT -j ACCEPT - -### INPUT -### (connections with the router as destination) - - # base case - iptables -P INPUT DROP - iptables -A INPUT -m state --state INVALID -j DROP - iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT - iptables -A INPUT -p tcp --tcp-flags SYN SYN --tcp-option \! 2 -j DROP - - # - # insert accept rule or to jump to new accept-check table here - # - iptables -A INPUT -j input_rule - - # allow - iptables -A INPUT -j LAN_ACCEPT # allow from lan/wifi interfaces - iptables -A INPUT -p icmp -j ACCEPT # allow ICMP - iptables -A INPUT -p gre -j ACCEPT # allow GRE - - # reject (what to do with anything not allowed earlier) - iptables -A INPUT -p tcp -j REJECT --reject-with tcp-reset - iptables -A INPUT -j REJECT --reject-with icmp-port-unreachable - -### OUTPUT -### (connections with the router as source) - - # base case - iptables -P OUTPUT DROP - iptables -A OUTPUT -m state --state INVALID -j DROP - iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT - - # - # insert accept rule or to jump to new accept-check table here - # - iptables -A OUTPUT -j output_rule - - # allow - iptables -A OUTPUT -j ACCEPT #allow everything out - - # reject (what to do with anything not allowed earlier) - iptables -A OUTPUT -p tcp -j REJECT --reject-with tcp-reset - iptables -A OUTPUT -j REJECT --reject-with icmp-port-unreachable - -### FORWARDING -### (connections routed through the router) - - # base case - iptables -P FORWARD DROP - iptables -A FORWARD -m state --state INVALID -j DROP - iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu - iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT - - # - # insert accept rule or to jump to new accept-check table here - # - iptables -A FORWARD -j forwarding_rule - - # allow - iptables -A FORWARD -i br0 -o br0 -j ACCEPT - [ -z "$WAN" ] || iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT - - # reject (what to do with anything not allowed earlier) - # uses the default -P DROP - -### MASQ - iptables -t nat -A PREROUTING -j prerouting_rule - iptables -t nat -A POSTROUTING -j postrouting_rule - [ -z "$WAN" ] || iptables -t nat -A POSTROUTING -o $WAN -j MASQUERADE +start() { + include /lib/network + scan_interfaces + + config_get WAN wan ifname + config_get LAN lan ifname + + ## CLEAR TABLES + for T in filter nat; do + iptables -t $T -F + iptables -t $T -X + done + + iptables -N input_rule + iptables -N output_rule + iptables -N forwarding_rule + + iptables -t nat -N prerouting_rule + iptables -t nat -N postrouting_rule + + iptables -N LAN_ACCEPT + [ -z "$WAN" ] || iptables -A LAN_ACCEPT -i "$WAN" -j RETURN + iptables -A LAN_ACCEPT -j ACCEPT + + ### INPUT + ### (connections with the router as destination) + + # base case + iptables -P INPUT DROP + iptables -A INPUT -m state --state INVALID -j DROP + iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT + iptables -A INPUT -p tcp --tcp-flags SYN SYN --tcp-option \! 2 -j DROP + + # + # insert accept rule or to jump to new accept-check table here + # + iptables -A INPUT -j input_rule + + # allow + iptables -A INPUT -j LAN_ACCEPT # allow from lan/wifi interfaces + iptables -A INPUT -p icmp -j ACCEPT # allow ICMP + iptables -A INPUT -p gre -j ACCEPT # allow GRE + + # reject (what to do with anything not allowed earlier) + iptables -A INPUT -p tcp -j REJECT --reject-with tcp-reset + iptables -A INPUT -j REJECT --reject-with icmp-port-unreachable + + ### OUTPUT + ### (connections with the router as source) + + # base case + iptables -P OUTPUT DROP + iptables -A OUTPUT -m state --state INVALID -j DROP + iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT + + # + # insert accept rule or to jump to new accept-check table here + # + iptables -A OUTPUT -j output_rule + + # allow + iptables -A OUTPUT -j ACCEPT #allow everything out + + # reject (what to do with anything not allowed earlier) + iptables -A OUTPUT -p tcp -j REJECT --reject-with tcp-reset + iptables -A OUTPUT -j REJECT --reject-with icmp-port-unreachable + + ### FORWARDING + ### (connections routed through the router) + + # base case + iptables -P FORWARD DROP + iptables -A FORWARD -m state --state INVALID -j DROP + iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu + iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT + + # + # insert accept rule or to jump to new accept-check table here + # + iptables -A FORWARD -j forwarding_rule + + # allow + iptables -A FORWARD -i br0 -o br0 -j ACCEPT + [ -z "$WAN" ] || iptables -A FORWARD -i $LAN -o $WAN -j ACCEPT + + # reject (what to do with anything not allowed earlier) + # uses the default -P DROP + + ### MASQ + iptables -t nat -A PREROUTING -j prerouting_rule + iptables -t nat -A POSTROUTING -j postrouting_rule + [ -z "$WAN" ] || iptables -t nat -A POSTROUTING -o $WAN -j MASQUERADE + + ## USER RULES + [ -f /etc/firewall.user ] && . /etc/firewall.user + [ -n "$WAN" -a -e /etc/config/firewall ] && { + awk -f /usr/lib/common.awk -f /usr/lib/firewall.awk /etc/config/firewall | ash + } +} -## USER RULES -[ -f /etc/firewall.user ] && . /etc/firewall.user -[ -n "$WAN" -a -e /etc/config/firewall ] && { - awk -f /usr/lib/common.awk -f /usr/lib/firewall.awk /etc/config/firewall | ash +stop() { + iptables -P INPUT ACCEPT + iptables -P OUTPUT ACCEPT + iptables -P FORWARD ACCEPT + iptables -F + iptables -t nat -P PREROUTING ACCEPT + iptables -t nat -P POSTROUTING ACCEPT + iptables -t nat -P OUTPUT ACCEPT + iptables -t nat -F } |