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-rw-r--r--package/iptables/files/firewall.awk64
1 files changed, 64 insertions, 0 deletions
diff --git a/package/iptables/files/firewall.awk b/package/iptables/files/firewall.awk
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+++ b/package/iptables/files/firewall.awk
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+# 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 ""
+ }
+}