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

1 files changed, 142 insertions, 0 deletions

diff --git a/package/firewall/files/old/firewall.init b/package/firewall/files/old/firewall.init
new file mode 100755
index 0000000000..0da97f836f
--- /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
+}