1 files changed, 64 insertions, 0 deletions
diff --git a/package/iptables/files/firewall.awk b/package/iptables/files/firewall.awk
new file mode 100644
index 0000000000..902c7b1888
--- /dev/null
+++ b/package/iptables/files/firewall.awk
@@ -0,0 +1,64 @@
+# 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=":"
+}
+
+($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] = ""
+	}
+}
+
+($1 == "accept") {
+	target = " -j ACCEPT"
+	for (o in _opt) {
+		print "iptables -t nat -A prerouting_$ifname" _opt[o] str2ipt($2) target
+		print "iptables        -A input_$ifname     " _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 ""
+	}
+}
+
+($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 ":" $4
+		}
+		else fwopts = ""
+	}
+	for (o in _opt) {
+		print "iptables -t nat -A prerouting_$ifname" _opt[o] str2ipt($2) target
+		print "iptables        -A forward_$ifname   " _opt[o] " -d " $3 fwopts " -j ACCEPT"
+		print ""
+	}
+}