#!/sbin/runscript
# Copyright 1999-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

opts="start stop reload"

depend() {
	before net
	need logger
}

start() {
	ebegin "Starting firewall"

	# enable IP forwarding
	echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
	echo 1 > /proc/sys/net/ipv4/ip_forward
	
	# default policy is DROP
	/sbin/iptables -P INPUT DROP
	/sbin/iptables -P OUTPUT DROP
	/sbin/iptables -P FORWARD DROP

	/sbin/ip6tables -P INPUT DROP
	/sbin/ip6tables -P OUTPUT DROP
	/sbin/ip6tables -P FORWARD DROP

	# allow esp
	ip6tables -A INPUT  -i eth0 -p 50 -j ACCEPT
	ip6tables -A OUTPUT -o eth0 -p 50 -j ACCEPT

	# allow IKE
	ip6tables -A INPUT  -i eth0 -p udp --sport 500 --dport 500 -j ACCEPT
	ip6tables -A OUTPUT -o eth0 -p udp --dport 500 --sport 500 -j ACCEPT

	# allow MobIKE
	ip6tables -A INPUT  -i eth0 -p udp --sport 4500 --dport 4500 -j ACCEPT
	ip6tables -A OUTPUT -o eth0 -p udp --dport 4500 --sport 4500 -j ACCEPT

	# allow last UDP fragment
	ip6tables -A INPUT -i eth0 -p udp -m frag --fraglast -j ACCEPT

	# allow ICMPv6 neighbor-solicitations
	ip6tables -A INPUT  -p icmpv6 --icmpv6-type neighbor-solicitation -j ACCEPT
	ip6tables -A OUTPUT -p icmpv6 --icmpv6-type neighbor-solicitation -j ACCEPT
	
	# allow ICMPv6 neighbor-advertisements
	ip6tables -A INPUT  -p icmpv6 --icmpv6-type neighbor-advertisement -j ACCEPT
	ip6tables -A OUTPUT -p icmpv6 --icmpv6-type neighbor-advertisement -j ACCEPT

	# allow crl fetch from winnetou
	iptables -A INPUT  -i eth0 -p tcp --sport 80 -s PH_IP_WINNETOU -j ACCEPT
	iptables -A OUTPUT -o eth0 -p tcp --dport 80 -d PH_IP_WINNETOU -j ACCEPT

	# allow ssh
	iptables -A INPUT  -p tcp --dport 22 -j ACCEPT
	iptables -A OUTPUT -p tcp --sport 22 -j ACCEPT

	# log dropped packets
	ip6tables -A INPUT  -j LOG --log-prefix " IN: "
	ip6tables -A OUTPUT -j LOG --log-prefix " OUT: "

	eend $?
}

stop() {
	ebegin "Stopping firewall"
		for a in `cat /proc/net/ip_tables_names`; do
			/sbin/ip6tables -F -t $a
			/sbin/ip6tables -X -t $a

			/sbin/iptables -F -t $a
			/sbin/iptables -X -t $a
	
			if [ $a == nat ]; then
				/sbin/iptables -t nat -P PREROUTING ACCEPT
				/sbin/iptables -t nat -P POSTROUTING ACCEPT
				/sbin/iptables -t nat -P OUTPUT ACCEPT
			elif [ $a == mangle ]; then
				/sbin/iptables -t mangle -P PREROUTING ACCEPT
				/sbin/iptables -t mangle -P INPUT ACCEPT
				/sbin/iptables -t mangle -P FORWARD ACCEPT
				/sbin/iptables -t mangle -P OUTPUT ACCEPT
				/sbin/iptables -t mangle -P POSTROUTING ACCEPT
			elif [ $a == filter ]; then
				/sbin/ip6tables -t filter -P INPUT ACCEPT
				/sbin/ip6tables -t filter -P FORWARD ACCEPT
				/sbin/ip6tables -t filter -P OUTPUT ACCEPT

				/sbin/iptables -t filter -P INPUT ACCEPT
				/sbin/iptables -t filter -P FORWARD ACCEPT
				/sbin/iptables -t filter -P OUTPUT ACCEPT
			fi
		done
	eend $?
}

reload() {
	ebegin "Flushing firewall"
		for a in `cat /proc/net/ip_tables_names`; do
			/sbin/ip6tables -F -t $a
			/sbin/ip6tables -X -t $a
		done;
        eend $?
	start
}