package/iptables/files/firewall.awk

   1 # Copyright (C) 2006 OpenWrt.org
   2
   3 BEGIN {
   4         print "ifname=\"$WAN\""
   5         print "[ -z \"$ifname\" ] && exit"
   6         print ""
   7         print "iptables -X input_$ifname 2>&- >&-"
   8         print "iptables -N input_$ifname"
   9         print "iptables -X forward_$ifname 2>&- >&-"
  10         print "iptables -N forward_$ifname"
  11         print "iptables -t nat -X prerouting_$ifname 2>&- >&-"
  12         print "iptables -t nat -N prerouting_$ifname"
  13         print ""
  14         print "iptables -A input_rule -i \"$ifname\" -j input_$ifname"
  15         print "iptables -A forwarding_rule -i \"$ifname\" -j forward_$ifname"
  16         print "iptables -t nat -A prerouting_rule -i \"$ifname\" -j prerouting_$ifname"
  17         print ""
  18         FS=":"
  19 }
  20
  21 ($1 == "accept") || ($1 == "drop") || ($1 == "forward") {
  22         delete _opt
  23         str2data($2)
  24         if ((_l["proto"] == "") && (_l["sport"] _l["dport"] != "")) {
  25                 _opt[0] = " -p tcp"
  26                 _opt[1] = " -p udp"
  27         } else {
  28                 _opt[0] = ""
  29         }
  30 }
  31
  32 ($1 == "accept") {
  33         target = " -j ACCEPT"
  34         for (o in _opt) {
  35                 print "iptables -t nat -A prerouting_$ifname" _opt[o] str2ipt($2) target
  36                 print "iptables        -A input_$ifname     " _opt[o] str2ipt($2) target
  37                 print ""
  38         }
  39 }
  40
  41 ($1 == "drop") {
  42         for (o in _opt) {
  43                 print "iptables -t nat -A prerouting_$ifname" _opt[o] str2ipt($2) " -j DROP"
  44                 print ""
  45         }
  46 }
  47
  48 ($1 == "forward") {
  49         target = " -j DNAT --to " $3
  50         fwopts = ""
  51         if ($4 != "") {
  52                 if ((_l["proto"] == "tcp") || (_l["proto"] == "udp") || (_l["proto"] == "")) {
  53                         if (_l["proto"] != "") fwopts = " -p " _l["proto"]
  54                         fwopts = fwopts " --dport " $4
  55                         target = target ":" $4
  56                 }
  57                 else fwopts = ""
  58         }
  59         for (o in _opt) {
  60                 print "iptables -t nat -A prerouting_$ifname" _opt[o] str2ipt($2) target
  61                 print "iptables        -A forward_$ifname   " _opt[o] " -d " $3 fwopts " -j ACCEPT"
  62                 print ""
  63         }
  64 }