[backfire] firewall: backport NAT reflection from trunk

[openwrt-10.03/.git] / package / firewall / files / reflection.hotplug

diff --git a/package/firewall/files/reflection.hotplug b/package/firewall/files/reflection.hotplug
new file mode 100644 (file)
index 0000000..dc6780a
--- /dev/null
+++ b/package/firewall/files/reflection.hotplug
@@ -0,0 +1,101 @@
+#!/bin/sh
+
+. /etc/functions.sh
+
+if [ "$ACTION" = "add" ] && [ "$INTERFACE" = "wan" ]; then
+       local wanip=$(uci -P/var/state get network.wan.ipaddr)
+
+       iptables -t nat -F nat_reflection_in 2>/dev/null || {
+               iptables -t nat -N nat_reflection_in
+               iptables -t nat -A prerouting_rule -j nat_reflection_in
+       }
+
+       iptables -t nat -F nat_reflection_out 2>/dev/null || {
+               iptables -t nat -N nat_reflection_out
+               iptables -t nat -A postrouting_rule -j nat_reflection_out
+       }
+
+       find_networks() {
+               find_networks_cb() {
+                       local cfg="$1"
+                       local zone="$2"
+
+                       local name
+                       config_get name "$cfg" name
+
+                       [ "$name" = "$zone" ] && {
+                               local network
+                               config_get network "$cfg" network
+
+                               echo ${network:-$zone}
+                               return 1
+                       }
+               }
+
+               config_foreach find_networks_cb zone "$1"
+       }
+       
+       setup_fwd() {
+               local cfg="$1"
+
+               local src
+               config_get src "$cfg" src
+
+               [ "$src" = wan ] && {
+                       local dest
+                       config_get dest "$cfg" dest "lan"
+
+                       local net
+                       for net in $(find_networks "$dest"); do
+                               local lanip=$(uci -P/var/state get network.$net.ipaddr)
+                               local lanmk=$(uci -P/var/state get network.$net.netmask)
+
+                               local proto
+                               config_get proto "$cfg" proto
+
+                               local epmin epmax extport
+                               config_get extport "$cfg" src_dport
+                               [ -n "$extport" ] || return
+
+                               epmin="${extport%[-:]*}"; epmax="${extport#*[-:]}"
+                               [ "$epmin" != "$epmax" ] || epmax=""
+
+                               local ipmin ipmax intport
+                               config_get intport "$cfg" dest_port "$extport"
+
+                               ipmin="${intport%[-:]*}"; ipmax="${intport#*[-:]}"
+                               [ "$ipmin" != "$ipmax" ] || ipmax=""
+
+                               local exthost
+                               config_get exthost "$cfg" src_dip "$wanip"
+
+                               local inthost
+                               config_get inthost "$cfg" dest_ip
+                               [ -n "$inthost" ] || return
+
+                               [ "$proto" = tcpudp ] && proto="tcp udp"
+
+                               local p
+                               for p in ${proto:-tcp udp}; do
+                                       case "$p" in
+                                               tcp|udp)
+                                                       iptables -t nat -A nat_reflection_in \
+                                                               -s $lanip/$lanmk -d $exthost \
+                                                               -p $p --dport $epmin${epmax:+:$epmax} \
+                                                               -j DNAT --to $inthost:$ipmin${ipmax:+-$ipmax}
+
+                                                       iptables -t nat -A nat_reflection_out \
+                                                               -s $lanip/$lanmk -d $inthost \
+                                                               -p $p --dport $ipmin${ipmax:+:$ipmax} \
+                                                               -j SNAT --to-source $lanip
+                                               ;;
+                                       esac
+                               done
+                       done
+               }
+       }
+
+       config_load firewall
+       config_foreach setup_fwd redirect
+fi
+