slight modification after disq's post

[openwrt.git] / target / default / target_skeleton / etc / init.d / S45firewall

diff --git a/target/default/target_skeleton/etc/init.d/S45firewall b/target/default/target_skeleton/etc/init.d/S45firewall
index 49b9df0..51f3a6d 100755 (executable)
--- a/target/default/target_skeleton/etc/init.d/S45firewall
+++ b/target/default/target_skeleton/etc/init.d/S45firewall
@@ -1,23 +1,36 @@
 #!/bin/sh
 . /etc/functions.sh
 
 #!/bin/sh
 . /etc/functions.sh
 

-WAN=$(nvram get wan_ifname)
-
-IPT=/usr/sbin/iptables
+export WAN=$(nvram get wan_ifname)
+export IPT=/usr/sbin/iptables

 
 for T in filter nat mangle ; do
   $IPT -t $T -F
   $IPT -t $T -X
 done
 
 
 for T in filter nat mangle ; do
   $IPT -t $T -F
   $IPT -t $T -X
 done
 

+# initial rules

 $IPT -t filter -A INPUT -m state --state INVALID -j DROP
 $IPT -t filter -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT 
 $IPT -t filter -A INPUT -m state --state INVALID -j DROP
 $IPT -t filter -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT 

-$IPT -t filter -A INPUT -p icmp -j ACCEPT 
-$IPT -t filter -A INPUT -i $WAN -p tcp -j REJECT --reject-with tcp-reset 
-$IPT -t filter -A INPUT -i $WAN -j REJECT --reject-with icmp-port-unreachable 

 $IPT -t filter -A FORWARD -m state --state INVALID -j DROP 
 $IPT -t filter -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT 
 $IPT -t filter -A FORWARD -m state --state INVALID -j DROP 
 $IPT -t filter -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT 

-$IPT -t filter -A FORWARD -i $WAN -m state --state NEW,INVALID -j DROP
+
+if [ -d /etc/firewall.d ]; then 
+       for fw in /etc/firewall.d/??*; do
+               [ -x $fw ] && $fw
+       done
+fi
+
+# defaults
+
+$IPT -t filter -A INPUT -p icmp -j ACCEPT
+$IPT -t filter -A INPUT -p 47 -j ACCEPT # allow GRE
+$IPT -t filter -A INPUT -i $WAN -p tcp --syn --tcp-option \! 2 -j  DROP
+$IPT -t filter -A INPUT -i $WAN -p tcp -j REJECT --reject-with tcp-reset 
+$IPT -t filter -A INPUT -i $WAN -j REJECT --reject-with icmp-port-unreachable 
+
+$IPT -t filter -A FORWARD -i br0 -o br0 -j ACCEPT
+$IPT -t filter -A FORWARD -i $WAN -m state --state NEW -j DROP

 $IPT -t filter -A FORWARD -o $WAN -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
 
 $IPT -t nat -A POSTROUTING -o $WAN -j MASQUERADE
 $IPT -t filter -A FORWARD -o $WAN -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
 
 $IPT -t nat -A POSTROUTING -o $WAN -j MASQUERADE