firewall: add basic NAT reflection/NAT loopback support

SVN-Revision: 22441

diff --git a/package/firewall/Makefile b/package/firewall/Makefile
index c1f3f6eb229b5f82f20ff3d0d8b6c4a1d06161fb..b489d9387b2a7e15ab526371093ac42de28cddb5 100644 (file)
--- a/package/firewall/Makefile
+++ b/package/firewall/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=firewall
 
 PKG_VERSION:=2
-PKG_RELEASE:=8
+PKG_RELEASE:=9
 
 include $(INCLUDE_DIR)/package.mk
 
@@ -45,6 +45,7 @@ define Package/firewall/install
        $(INSTALL_BIN) ./files/firewall.init $(1)/etc/init.d/firewall
        $(INSTALL_DIR) $(1)/etc/hotplug.d/iface
        $(INSTALL_DATA) ./files/firewall.hotplug $(1)/etc/hotplug.d/iface/20-firewall
+       $(INSTALL_DATA) ./files/reflection.hotplug $(1)/etc/hotplug.d/iface/30-nat-reflection
        $(INSTALL_DIR) $(1)/etc
        $(INSTALL_DATA) ./files/firewall.user $(1)/etc
 endef

diff --git a/package/firewall/files/reflection.hotplug b/package/firewall/files/reflection.hotplug
new file mode 100644 (file)
index 0000000..605ac7c
--- /dev/null
+++ b/package/firewall/files/reflection.hotplug
@@ -0,0 +1,79 @@
+#!/bin/sh
+# Setup NAT reflection rules
+
+. /etc/functions.sh
+
+if [ "$ACTION" = "ifup" ] && [ "$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
+       }
+
+       setup_fwd() {
+               local cfg="$1"
+
+               local src
+               config_get src "$cfg" src
+
+               [ "$src" = wan ] && {
+                       local dest
+                       config_get dest "$cfg" dest "lan"
+
+                       local lanip=$(uci -P/var/state get network.$dest.ipaddr)
+                       local lanmk=$(uci -P/var/state get network.$dest.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
+               }
+       }
+
+       config_load firewall
+       config_foreach setup_fwd redirect
+fi
+