prepare for moving part of the firewall to hotplug. created new chains {input,forwarding,prerouting}_wan for wan port forwardings and updated the examples. syntax of /etc/config/firewall unchanged and old firewall.user files are still compatible

SVN-Revision: 5878

package/iptables/files/firewall.awk

@@ -1,20 +1,6 @@
 # Copyright (C) 2006 OpenWrt.org
 
 BEGIN {
-	print "ifname=\"$WAN\""
-	print "[ -z \"$ifname\" ] && exit"
-	print ""
-	print "iptables -X input_$ifname 2>&- >&-"
-	print "iptables -N input_$ifname"
-	print "iptables -X forward_$ifname 2>&- >&-"
-	print "iptables -N forward_$ifname"
-	print "iptables -t nat -X prerouting_$ifname 2>&- >&-"
-	print "iptables -t nat -N prerouting_$ifname"
-	print ""
-	print "iptables -A input_rule -i \"$ifname\" -j input_$ifname"
-	print "iptables -A forwarding_rule -i \"$ifname\" -j forward_$ifname"
-	print "iptables -t nat -A prerouting_rule -i \"$ifname\" -j prerouting_$ifname"
-	print ""
 	FS=":"
 }
 
@@ -32,15 +18,15 @@ BEGIN {
 ($1 == "accept") {
 	target = " -j ACCEPT"
 	for (o in _opt) {
-		print "iptables -t nat -A prerouting_$ifname" _opt[o] str2ipt($2) target
-		print "iptables        -A input_$ifname     " _opt[o] str2ipt($2) target
+		print "iptables -t nat -A prerouting_wan" _opt[o] str2ipt($2) target
+		print "iptables        -A input_wan     " _opt[o] str2ipt($2) target
 		print ""
 	}
 }
 
 ($1 == "drop") {
 	for (o in _opt) {
-		print "iptables -t nat -A prerouting_$ifname" _opt[o] str2ipt($2) " -j DROP"
+		print "iptables -t nat -A prerouting_wan" _opt[o] str2ipt($2) " -j DROP"
 		print ""
 	}
 }
@@ -57,8 +43,8 @@ BEGIN {
 		else fwopts = ""
 	}
 	for (o in _opt) {
-		print "iptables -t nat -A prerouting_$ifname" _opt[o] str2ipt($2) target
-		print "iptables        -A forward_$ifname   " _opt[o] " -d " $3 fwopts " -j ACCEPT"
+		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 ""
 	}
 }

package/iptables/files/firewall.init

@@ -18,10 +18,13 @@ start() {
 	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 prerouting_rule
+	iptables -t nat -N prerouting_wan
 	iptables -t nat -N postrouting_rule
 	
 	iptables -N LAN_ACCEPT
@@ -42,6 +45,7 @@ start() {
 	# 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 
@@ -85,6 +89,7 @@ start() {
 	# 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
@@ -95,6 +100,7 @@ start() {
 	
 	### MASQ
 	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
 	[ -z "$WAN" ] || iptables -t nat -A POSTROUTING -o $WAN -j MASQUERADE
 	
@@ -111,8 +117,10 @@ stop() {
 	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
 }

package/iptables/files/firewall.user

@@ -7,22 +7,24 @@ iptables -F forwarding_rule
 iptables -t nat -F prerouting_rule
 iptables -t nat -F postrouting_rule
 
-### BIG FAT DISCLAIMER
-## The "-i $WAN" is used to match packets that come in via the $WAN interface.
-## it WILL NOT MATCH packets sent from the $WAN ip address -- you won't be able
-## to see the effects from within the LAN.
+# 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_rule -i $WAN -p tcp --dport 22 -j ACCEPT 
-# iptables        -A input_rule      -i $WAN -p tcp --dport 22 -j ACCEPT
+# 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_rule -i $WAN -p tcp --dport 8080 -j DNAT --to 192.168.1.2:80
-# iptables        -A forwarding_rule -i $WAN -p tcp --dport 80 -d 192.168.1.2 -j ACCEPT
+# 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_rule -i $WAN -j DNAT --to 192.168.1.2
-# iptables        -A forwarding_rule -i $WAN -d 192.168.1.2 -j ACCEPT
+# iptables -t nat -A prerouting_wan -j DNAT --to 192.168.1.2
+# iptables        -A forwarding_wan -d 192.168.1.2 -j ACCEPT