Only masquerade non routable addresses (#2535)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@9460 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/iptables/files/firewall.init b/package/iptables/files/firewall.init
index 388c5b4..9d8a405 100755 (executable)
--- a/package/iptables/files/firewall.init
+++ b/package/iptables/files/firewall.init
@@ -105,7 +105,10 @@ start() {
        iptables -t nat -A PREROUTING -j prerouting_rule
        [ -z "$WAN" ] || iptables -t nat -A PREROUTING -i "$WAN" -j prerouting_wan
        iptables -t nat -A POSTROUTING -j postrouting_rule
-       [ -z "$WAN" ] || iptables -t nat -A POSTROUTING -o $WAN -j MASQUERADE
+       ### Only RFC1918 addresses
+       [ -z "$WAN" ] || iptables -t nat -A POSTROUTING --src 192.168.0.0/16 -o $WAN -j MASQUERADE
+       [ -z "$WAN" ] || iptables -t nat -A POSTROUTING --src 172.16.0.0/12 -o $WAN -j MASQUERADE
+       [ -z "$WAN" ] || iptables -t nat -A POSTROUTING --src 10.0.0.0/8 -o $WAN -j MASQUERADE
 
        iptables -t nat -A NEW -m limit --limit 50 --limit-burst 100 -j RETURN && \
                iptables -t nat -A NEW -j DROP