From: Florian Fainelli <florian@openwrt.org>
Date: Mon, 29 Oct 2007 10:31:16 +0000 (+0000)
Subject: Only masquerade non routable addresses (#2535)
X-Git-Url: http://git.openwrt.org/?a=commitdiff_plain;h=304d5c8845273000cd84ee4a25ec6542a5ee94d8;p=openwrt%2Fstaging%2Fwigyori.git

Only masquerade non routable addresses (#2535)

SVN-Revision: 9460
---

diff --git a/package/iptables/files/firewall.init b/package/iptables/files/firewall.init
index 388c5b4f91..9d8a405ab0 100755
--- 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