adds a new uci firewall - iptbales and netfilter packages need to be rewrapped when we switch to this firewall as default - there are some examples in the file /etc/config/firewall - iptables-save/restore are still missing - hotplug takes care of adding/removing netdevs during runtime - misisng features ? wishes ? let me know ...

SVN-Revision: 12089

10 files changed, 782 insertions, 0 deletions

diff --git a/package/firewall/Config.in b/package/firewall/Config.in
new file mode 100644
index 0000000..616b020
--- /dev/null
+++ b/package/firewall/Config.in
@@ -0,0 +1,17 @@
+choice
+        prompt "Choose firewall"
+        default FIREWALL_OLD
+		depends PACKAGE_firewall
+
+config FIREWALL_OLD
+	bool "old firewall"
+
+config FIREWALL_NEW
+	bool "new uci firewall"
+	select PACKAGE_iptables-mod-conntrack
+	select PACKAGE_iptables-mod-extra 
+	select PACKAGE_iptables-mod-ipopt
+	select PACKAGE_iptables-mod-ulog
+	select PACKAGE_kmod-ipt-nathelper
+
+endchoice
diff --git a/package/firewall/Makefile b/package/firewall/Makefile
new file mode 100644
index 0000000..e073b57
--- /dev/null
+++ b/package/firewall/Makefile
@@ -0,0 +1,69 @@
+#
+# Copyright (C) 2008 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=firewall
+
+PKG_VERSION:=1
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/firewall
+  SECTION:=net
+  CATEGORY:=Base system
+  URL:=http://openwrt.org/
+  TITLE:=OpenWrt firewall
+  DEPENDS:=+iptables
+endef
+
+define Package/firewall/description
+ firewall for openwrt, you can select if you want to use the old version or the new uci based script
+endef
+
+define Package/firewall/config
+	source "$(SOURCE)/Config.in"
+endef
+
+define Build/Compile
+	true
+endef
+
+ifeq ($(CONFIG_FIREWALL_NEW),y)
+define Package/firewall/conffiles
+/etc/config/firewall
+endef
+
+define Package/firewall/install
+	$(INSTALL_DIR) $(1)/lib/firewall
+	$(INSTALL_DATA) ./files/new/uci_firewall.sh $(1)/lib/firewall
+	$(INSTALL_DIR) $(1)/etc/config
+	$(INSTALL_DATA) ./files/new/firewall.config $(1)/etc/config/firewall
+	$(INSTALL_DIR) $(1)/etc/init.d/
+	$(INSTALL_BIN) ./files/new/firewall.init $(1)/etc/init.d/firewall
+	$(INSTALL_DIR) $(1)/etc/hotplug.d/iface
+	$(INSTALL_DATA) ./files/new/20-firewall $(1)/etc/hotplug.d/iface
+endef
+
+else
+
+define Package/firewall/conffiles
+/etc/firewall.config
+/etc/firewall.user
+endef
+
+define Package/firewall/install
+	$(INSTALL_DIR) $(1)/etc/config
+	$(INSTALL_DATA) ./files/old/firewall.config $(1)/etc/
+	$(INSTALL_DIR) $(1)/etc/init.d
+	$(INSTALL_BIN) ./files/old/firewall.init $(1)/etc/init.d/firewall
+	$(INSTALL_BIN) ./files/old/firewall.user $(1)/etc/
+	$(INSTALL_DIR) $(1)/usr/lib
+	$(INSTALL_DATA) ./files/old/firewall.awk $(1)/usr/lib
+endef
+endif
+$(eval $(call BuildPackage,firewall))
diff --git a/package/firewall/files/new/20-firewall b/package/firewall/files/new/20-firewall
new file mode 100644
index 0000000..a8ce17c
--- /dev/null
+++ b/package/firewall/files/new/20-firewall
@@ -0,0 +1,41 @@
+. /lib/firewall/uci_firewall.sh
+unset ZONE
+config_get ifname $INTERFACE ifname
+INTERFACE=$ifname
+[ "$INTERFACE" == "lo" ] && exit 0
+load_zones() {
+	local name
+	local network
+	config_get name $1 name
+	config_get network $1 network
+	[ -z "$network" ] && return
+	for n in $network; do
+		local ifname
+		config_get ifname $n ifname
+		list_contains ifname $INTERFACE && { 
+			list_contains ZONE $name || ZONE="$ZONE $name"
+		}
+	done
+}
+
+config_foreach load_zones zone
+
+IFACE=$(find_config $INTERFACE)
+[ -n "$IFACE" ] && 
+	list_contains ZONE $IFACE || ZONE="$ZONE $IFACE"
+
+[ ifup = "$ACTION" ] && {
+	for z in $ZONE; do 
+		local loaded
+		config_get loaded core loaded
+		[ -n "$loaded" ] && addif $INTERFACE $z
+	done
+}
+
+[ ifdown = "$ACTION" ] && {
+	for z in $ZONE; do 
+		local up
+		config_get up $z up
+		[ "$up" == "1" ] && delif $INTERFACE $z
+	done
+}
diff --git a/package/firewall/files/new/firewall.config b/package/firewall/files/new/firewall.config
new file mode 100755
index 0000000..0731690
--- /dev/null
+++ b/package/firewall/files/new/firewall.config
@@ -0,0 +1,80 @@
+config defaults
+	option syn_flood	1
+	option input		DROP 
+	option output		ACCEPT 
+	option forward		DROP 
+
+config zone
+	option name		lan
+	option input	ACCEPT 
+	option output	ACCEPT 
+	option forward	DROP 
+
+config zone
+	option name		wan
+	option input	DROP 
+	option output	ACCEPT 
+	option forward	DROP 
+	option masq		1 
+
+config forwarding 
+	option src      lan
+	option dest     wan
+
+
+### EXAMPLE CONFIG SECTIONS
+# do not allow a specific ip to access wan
+#config rule
+#	option src		lan
+#	option src_ip	192.168.45.2
+#	option dest		wan
+#	option proto	tcp
+#	option target	REJECT 
+
+# block a specific mac on wan
+#config rule
+#	option dest		wan
+#	option src_mac	00:11:22:33:44:66
+#	option target	REJECT 
+
+# block incoming ICMP traffic on a zone
+#config rule
+#	option src		lan
+#	option proto	ICMP
+#	option target	DROP
+
+# port redirect port coming in on wan to lan
+#config redirect
+#	option src			wan
+#	option src_dport	80
+#	option dest			lan
+#	option dest_ip		192.168.16.235
+#	option dest_port	80 
+#	option protocol		tcp
+
+# include a file with users custom iptables rules
+#config include
+#	option path /etc/firewall.user
+
+
+### FULL CONFIG SECTIONS
+#config rule
+#	option src		lan
+#	option src_ip	192.168.45.2
+#	option src_mac	00:11:22:33:44:55
+#	option src_port	80
+#	option dest		wan
+#	option dest_ip	194.25.2.129
+#	option dest_port	120
+#	option proto	tcp
+#	option target	REJECT 
+
+#config redirect
+#	option src		lan
+#	option src_ip	192.168.45.2
+#	option src_mac	00:11:22:33:44:55
+#	option src_port		1024
+#	option src_dport	80
+#	option dest_ip	194.25.2.129
+#	option dest_port	120
+#	option proto	tcp
diff --git a/package/firewall/files/new/firewall.init b/package/firewall/files/new/firewall.init
new file mode 100755
index 0000000..26855f3
--- /dev/null
+++ b/package/firewall/files/new/firewall.init
@@ -0,0 +1,14 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2008 OpenWrt.org
+
+START=45
+
+start() {
+	. /lib/firewall/uci_firewall.sh
+	fw_init
+}
+
+stop() {
+	. /lib/firewall/uci_firewall.sh
+	fw_stop	
+}
diff --git a/package/firewall/files/new/uci_firewall.sh b/package/firewall/files/new/uci_firewall.sh
new file mode 100755
index 0000000..dcb9c10
--- /dev/null
+++ b/package/firewall/files/new/uci_firewall.sh
@@ -0,0 +1,291 @@
+#!/bin/sh 
+# Copyright (C) 2008 John Crispin <blogic@openwrt.org>
+
+. /etc/functions.sh
+
+IPTABLES="echo iptables"
+IPTABLES=iptables
+
+config_clear
+include /lib/network
+scan_interfaces
+
+CONFIG_APPEND=1
+config_load firewall
+
+config fw_zones
+ZONE_LIST=$CONFIG_SECTION
+
+DEF_INPUT=DROP
+DEF_OUTPUT=DROP
+DEF_FORWARD=DROP
+
+load_policy() {
+	config_get input $1 input
+	config_get output $1 output
+	config_get forward $1 forward
+
+	[ -z "$input" ] && input=$DEF_INPUT
+	[ -z "$output" ] && output=$DEF_OUTPUT
+	[ -z "$forward" ] && forward=$DEF_FORWARD
+}
+
+create_zone() {
+	local exists
+	
+	[ "$1" == "loopback" ] && return
+
+	config_get exists $ZONE_LIST $1
+	[ -n "$exists" ] && return
+	config_set $ZONE_LIST $1 1 
+
+	$IPTABLES -N zone_$1
+	$IPTABLES -N zone_$1_ACCEPT
+	$IPTABLES -N zone_$1_DROP
+	$IPTABLES -N zone_$1_REJECT
+	$IPTABLES -N zone_$1_forward
+	$IPTABLES -A zone_$1_forward -j zone_$1_$5
+	$IPTABLES -A zone_$1 -j zone_$1_$3
+	$IPTABLES -A OUTPUT -j zone_$1_$4
+	$IPTABLES -N zone_$1_nat -t nat
+	$IPTABLES -N zone_$1_prerouting -t nat
+	[ "$6" == "1" ] && $IPTABLES -t nat -A POSTROUTING -j zone_$2_nat
+}
+
+addif() {
+	logger "adding $1 to firewall zone $2"
+	$IPTABLES -A INPUT -i $1 -j zone_$2
+	$IPTABLES -I zone_$2_ACCEPT 1 -o $1 -j ACCEPT
+	$IPTABLES -I zone_$2_DROP 1 -o $1 -j DROP
+	$IPTABLES -I zone_$2_REJECT 1 -o $1 -j REJECT
+	$IPTABLES -I zone_$2_ACCEPT 1 -i $1 -j ACCEPT
+	$IPTABLES -I zone_$2_DROP 1 -i $1 -j DROP
+	$IPTABLES -I zone_$2_REJECT 1 -i $1 -j REJECT
+	$IPTABLES -I zone_$2_nat 1 -t nat -o $1 -j MASQUERADE 
+	$IPTABLES -I PREROUTING 1 -t nat -i $1 -j zone_$2_prerouting 
+	$IPTABLES -A FORWARD -i $1 -j zone_$2_forward
+}
+
+delif() {
+	logger "removing $1 from firewall zone $2"
+	$IPTABLES -D INPUT -i $1 -j zone_$2
+	$IPTABLES -D zone_$2_ACCEPT -o $1 -j ACCEPT
+	$IPTABLES -D zone_$2_DROP -o $1 -j DROP
+	$IPTABLES -D zone_$2_REJECT -o $1 -j REJECT
+	$IPTABLES -D zone_$2_ACCEPT -i $1 -j ACCEPT
+	$IPTABLES -D zone_$2_DROP -i $1 -j DROP
+	$IPTABLES -D zone_$2_REJECT -i $1 -j REJECT
+	$IPTABLES -D zone_$2_nat -t nat -o $1 -j MASQUERADE 
+	$IPTABLES -D PREROUTING -t nat -i $1 -j zone_$2_prerouting 
+	$IPTABLES -D FORWARD -i $1 -j zone_$2_forward
+}
+
+load_synflood() {
+	echo "Loading synflood protection"
+	$IPTABLES -N SYN_FLOOD
+	$IPTABLES -A SYN_FLOOD -p tcp --syn -m limit --limit ${1}/second --limit-burst $2 -j RETURN
+	$IPTABLES -A SYN_FLOOD -p ! tcp -j RETURN
+	$IPTABLES -A SYN_FLOOD -p tcp ! --syn -j RETURN
+	$IPTABLES -A SYN_FLOOD -j LOG --log-prefix "syn_flood: " 
+	$IPTABLES -A SYN_FLOOD -j DROP
+	$IPTABLES -A INPUT -p tcp --syn -j SYN_FLOOD
+}
+
+create_network_zone() {
+	create_zone "$1" "$1"
+}
+
+fw_defaults() {
+	load_policy $1
+	DEF_INPUT=$input
+	DEF_OUTPUT=$output
+	DEF_FORWARD=$forward
+
+	echo 1 > /proc/sys/net/ipv4/tcp_syncookies
+	for f in /proc/sys/net/ipv4/conf/*/accept_redirects 
+	do
+		echo 0 > $f
+	done
+	for f in /proc/sys/net/ipv4/conf/*/accept_source_route 
+	do
+		echo 0 > $f
+	done                                                                   
+
+	$IPTABLES -F
+	$IPTABLES -t nat -F
+	$IPTABLES -t mangle -F
+	$IPTABLES -X -t nat
+	$IPTABLES -X
+	
+	$IPTABLES -P INPUT $input
+	$IPTABLES -A INPUT -m state --state INVALID -j DROP
+	$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
+		
+	$IPTABLES -P OUTPUT $output
+	$IPTABLES -A OUTPUT -m state --state INVALID -j DROP
+	$IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
+	
+	$IPTABLES -P FORWARD $forward
+	$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
+	
+	$IPTABLES -A INPUT -i lo -j ACCEPT
+	$IPTABLES -A OUTPUT -o lo -j ACCEPT
+
+	config_get syn_flood $1 syn_flood
+	config_get syn_rate $1 syn_rate
+	config_get syn_burst $1 syn_burst
+
+	[ -z "$syn_rate" ] && syn_rate=25
+	[ -z "$syn_burst" ] && syn_burst=50
+	[ "$syn_flood" == "1" ] && load_synflood $syn_rate $syn_burst
+}
+
+fw_zone() {
+	local name
+	local network
+	local masq
+
+	config_get name $1 name
+	config_get network $1 network
+	config_get masq $1 masq
+	load_policy $1
+
+	[ -z "$network" ] && network=$name
+	create_zone "$name" "$network" "$input" "$output" "$forward" "$masq"
+}
+
+fw_rule() {
+	local src 
+	local src_ip
+	local src_mac
+	local src_port
+	local src_mac
+	local dest
+	local dest_ip
+	local dest_port
+	local proto
+	local target
+
+	config_get src $1 src
+	config_get src_ip $1 src_ip
+	config_get src_mac $1 src_mac
+	config_get src_port $1 src_port
+	config_get dest $1 dest
+	config_get dest_ip $1 dest_ip
+	config_get dest_port $1 dest_port
+	config_get proto $1 proto
+	config_get target $1 target
+	config_get ruleset $1 ruleset
+
+	[ -z "$target" ] && target=DROP
+	[ -n "$src" ] && ZONE=zone_$src || ZONE=INPUT
+	[ -n "$dest" ] && TARGET=zone_${dest}_$target || TARGET=$target
+	$IPTABLES -I $ZONE 1 \
+		${proto:+-p $proto} \
+		${src_ip:+-s $src_ip} \
+		${src_port:+--sport $src_port} \
+		${src_mac:+-m mac --mac-source $src_mac} \
+		${dest_ip:+-d $dest_ip} \
+		${dest_port:+--dport $dest_port} \
+		-j $TARGET 
+}
+
+fw_forwarding() {
+	local src
+	local dest
+	local masq
+
+	config_get src $1 src
+	config_get dest $1 dest
+	[ -n "$src" ] && z_src=zone_${src}_forward || z_src=FORWARD
+	[ -n "$dest" ] && z_dest=zone_${dest}_ACCEPT || z_dest=ACCEPT
+	$IPTABLES -I $z_src 1 -j $z_dest
+}
+
+fw_redirect() {
+	local src
+	local src_ip
+	local src_port
+	local src_dport
+	local src_mac
+	local dest_ip
+	local dest_port
+	local protocol
+	
+	config_get src $1 src
+	config_get src_ip $1 src_ip
+	config_get src_port $1 src_port
+	config_get src_dport $1 src_dport
+	config_get src_mac $1 src_mac
+	config_get dest_ip $1 dest_ip
+	config_get dest_port $1 dest_port
+	config_get protocol $1 protocol
+	[ -z "$src" -o -z "$dest_ip" ] && { \
+		echo "redirect needs src and dest_ip"; return ; }
+	$IPTABLES -A zone_${src}_prerouting -t nat \
+		${protocol:+-p $protocol} \
+		${src_ip:+-s $srcdip} \
+		${src_port:+--sport $src_port} \
+		${src_dport:+--dport $src_dport} \
+		${src_mac:+-m mac --mac-source $src_mac} \
+		-j DNAT --to-destination $dest_ip${dest_port:+:$dest_port}
+	$IPTABLES -I zone_${src}_forward 1 \
+		${protocol:+-p $protocol} \
+		-d $dest_ip \
+		${src_ip:+-s $srcdip} \
+		${src_port:+--sport $src_port} \
+		${dest_port:+--dport $dest_port} \
+		${src_mac:+-m mac --mac-source $src_mac} \
+		-j ACCEPT 
+}
+
+fw_include() {
+	local path
+	config_get path $1 path
+	[ -e $path ] && . $path
+}
+
+fw_addif() {
+	local up
+	local ifname
+	config_get up $1 up
+	config_get ifname $1 ifname
+	[ -n "$up" ] || return 0
+	(ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/20-firewall)
+}
+
+fw_init() {
+	echo "Loading defaults"
+	config_foreach fw_defaults defaults
+	echo "Loading zones"
+	config_foreach fw_zone zone
+	echo "Loading interfaces"
+	config_foreach create_network_zone interface
+	echo "Loading rules"
+	config_foreach fw_rule rule
+	echo "Loading forwarding"
+	config_foreach fw_forwarding forwarding
+	echo "Loading redirects"
+	config_foreach fw_redirect redirect
+	echo "Loading includes"
+	config_foreach fw_include include
+	
+	uci_set_state firewall core "" firewall_state 
+	uci_set_state firewall core loaded 1
+	unset CONFIG_APPEND
+	config_load network
+	config_foreach fw_addif interface
+}
+
+fw_stop() {
+	$IPTABLES -F
+	$IPTABLES -t nat -F
+	$IPTABLES -t mangle -F
+	$IPTABLES -X -t nat
+	$IPTABLES -X
+	$IPTABLES -P INPUT ACCEPT
+	$IPTABLES -P OUTPUT ACCEPT
+	$IPTABLES -P FORWARD ACCEPT
+}
diff --git a/package/firewall/files/old/firewall.awk b/package/firewall/files/old/firewall.awk
new file mode 100644
index 0000000..31dbae0
--- /dev/null
+++ b/package/firewall/files/old/firewall.awk
@@ -0,0 +1,50 @@
+# Copyright (C) 2006 OpenWrt.org
+
+BEGIN {
+	FS=":"
+}
+
+($1 == "accept") || ($1 == "drop") || ($1 == "forward") {
+	delete _opt
+	str2data($2)
+	if ((_l["proto"] == "") && (_l["sport"] _l["dport"] != "")) {
+		_opt[0] = " -p tcp"
+		_opt[1] = " -p udp"
+	} else {
+		_opt[0] = ""
+	}
+}
+
+($1 == "accept") {
+	target = " -j ACCEPT"
+	for (o in _opt) {
+		print "iptables -t nat -A prerouting_wan" _opt[o] str2ipt($2) target
+		print "iptables        -A input_wan     " _opt[o] str2ipt($2) target
+		print ""
+	}
+}
+
+($1 == "drop") {
+	for (o in _opt) {
+		print "iptables -t nat -A prerouting_wan" _opt[o] str2ipt($2) " -j DROP"
+		print ""
+	}
+}
+
+($1 == "forward") {
+	target = " -j DNAT --to " $3
+	fwopts = ""
+	if ($4 != "") {
+		if ((_l["proto"] == "tcp") || (_l["proto"] == "udp") || (_l["proto"] == "")) {
+			if (_l["proto"] != "") fwopts = " -p " _l["proto"]
+			fwopts = fwopts " --dport " $4
+			target = target ":" $4
+		}
+		else fwopts = ""
+	}
+	for (o in _opt) {
+		print "iptables -t nat -A prerouting_wan" _opt[o] str2ipt($2) target
+		print "iptables        -A forwarding_wan   " _opt[o] " -d " $3 fwopts " -j ACCEPT"
+		print ""
+	}
+}
diff --git a/package/firewall/files/old/firewall.config b/package/firewall/files/old/firewall.config
new file mode 100644
index 0000000..1b92954
--- /dev/null
+++ b/package/firewall/files/old/firewall.config
@@ -0,0 +1,48 @@
+# Copyright (C) 2006 OpenWrt.org
+
+# RULE SYNTAX:
+#
+# forward:<match>:<target>[:<port>]
+# 	- forwards all packets matched by <match> to <target>,
+# 	  optionally changing the port to <port>
+#
+# accept:<match>
+# 	- accepts all traffic matched by <match>
+#
+# drop:<match>
+#	- drops all traffic matched by <match>
+#
+#
+# MATCHING OPTIONS:
+#
+# src=<ip>
+# 	- match the source ip <ip>
+#
+# dest=<ip>
+# 	- match the destination ip <ip>
+#
+# proto=<proto>
+# 	- match the protocol by name or number
+#
+# sport=<port(s)>
+# 	- match the source port(s), see below for syntax
+#
+# dport=<port(s)>
+# 	- match the destination port(s), see below for syntax
+#
+#
+#
+# PORT SYNTAX:
+#
+# You can enter an arbitrary list of ports and port ranges in the following format:
+#   - 22,53,993,1000-1024 
+#
+# If you don't set the protocol to tcp or udp, it will apply to both
+#
+#
+#
+# EXAMPLES:
+#
+# drop:dport=22 src=1.3.3.7
+# accept:proto=tcp dport=22
+# forward:dport=60168:192.168.1.2:60169
diff --git a/package/firewall/files/old/firewall.init b/package/firewall/files/old/firewall.init
new file mode 100755
index 0000000..0da97f8
--- /dev/null
+++ b/package/firewall/files/old/firewall.init
@@ -0,0 +1,142 @@
+#!/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
+}
diff --git a/package/firewall/files/old/firewall.user b/package/firewall/files/old/firewall.user
new file mode 100644
index 0000000..f4eb18e
--- /dev/null
+++ b/package/firewall/files/old/firewall.user
@@ -0,0 +1,30 @@
+#!/bin/sh
+# Copyright (C) 2006 OpenWrt.org
+
+iptables -F input_rule
+iptables -F output_rule
+iptables -F forwarding_rule
+iptables -t nat -F prerouting_rule
+iptables -t nat -F postrouting_rule
+
+# The following chains are for traffic directed at the IP of the 
+# WAN interface
+
+iptables -F input_wan
+iptables -F forwarding_wan
+iptables -t nat -F prerouting_wan
+
+### Open port to WAN
+## -- This allows port 22 to be answered by (dropbear on) the router
+# iptables -t nat -A prerouting_wan -p tcp --dport 22 -j ACCEPT 
+# iptables        -A input_wan      -p tcp --dport 22 -j ACCEPT
+
+### Port forwarding
+## -- This forwards port 8080 on the WAN to port 80 on 192.168.1.2
+# iptables -t nat -A prerouting_wan -p tcp --dport 8080 -j DNAT --to 192.168.1.2:80
+# iptables        -A forwarding_wan -p tcp --dport 80 -d 192.168.1.2 -j ACCEPT
+
+### DMZ
+## -- Connections to ports not handled above will be forwarded to 192.168.1.2
+# iptables -t nat -A prerouting_wan -j DNAT --to 192.168.1.2
+# iptables        -A forwarding_wan -d 192.168.1.2 -j ACCEPT