X-Git-Url: https://git.distorted.org.uk/~mdw/firewall/blobdiff_plain/e7de4e98fd2e8ff83dba6a6117b2d90266f1065e..HEAD:/fender.m4

diff --git a/fender.m4 b/fender.m4
index dda96f8..ebabf07 100644
--- a/fender.m4
+++ b/fender.m4
@@ -33,34 +33,13 @@ allowservices inbound tcp \
 ## We have to provide NTP service.  The guests sync to our clock.
 ntpclient inbound $ntp_servers
 
-## Guaranteed black hole.  Put this at the very front of the chain.
-run iptables -I INPUT -d 212.13.198.78 -j DROP
-run ip6tables -I INPUT -d 2001:ba8:0:1d9::ffff -j DROP
+## Provide NTP service to untrusted clients.
+run ip46tables -A inbound-untrusted -p udp -j ACCEPT \
+	  --source-port 123 --destination-port 123
 
-## Ethernet bridge-level filtering for source addresses.
-run ebtables -F
-for c in bad-source-addr check-eth0; do
-  run ebtables -X $c >/dev/null 2>&1 || :
-done
-for i in log limit ip ip6; do run modprobe ebt-$i; done
-run ebtables -N bad-source-addr
-run ebtables -A bad-source-addr \
-	--limit 20/second --limit-burst 100 \
-	--log-prefix "fw: bad-source-addr(br) " --log-ip --log-ip6
-run ebtables -A bad-source-addr -j DROP
-run ebtables -N check-eth0
-run ebtables -A check-eth0 -j RETURN -p ip --ip-source ! 212.13.198.64/28
-run ebtables -A check-eth0 -j RETURN -p ip6 --ip6-source 2001:ba8:0:1d9::1
-run ebtables -A check-eth0 -j bad-source-addr \
-	-p ip6 --ip6-source 2001:ba8:1d9::/48
-run ebtables -A check-eth0 -j bad-source-addr \
-	-p ip6 --ip6-source 2001:ba8:0:1d9::/64
-run ebtables -A check-eth0 -j RETURN -p ip6
-run ebtables -A check-eth0 -j RETURN -p ip --ip-source 212.13.198.64/30
-run ebtables -A check-eth0 -j RETURN -p ip --ip-source 212.13.198.68
-run ebtables -A check-eth0 -j bad-source-addr -p ip
-run ebtables -A INPUT -j check-eth0 -i bond0
-run ebtables -A FORWARD -j check-eth0 -i bond0
+## Guaranteed black hole.  Put this at the very front of the chain.
+run iptables -I INPUT -d 217.169.12.78 -j DROP
+run ip6tables -I INPUT -d 2001:8b0:c92:fff::ffff -j DROP
 
 m4_divert(-1)
 ###----- That's all, folks --------------------------------------------------