X-Git-Url: https://git.distorted.org.uk/~mdw/firewall/blobdiff_plain/32110b35da9d3ed1ce9668d3f17c28100a878687..e7de4e98fd2e8ff83dba6a6117b2d90266f1065e:/fender.m4

diff --git a/fender.m4 b/fender.m4
index c8b2ee7..dda96f8 100644
--- a/fender.m4
+++ b/fender.m4
@@ -37,5 +37,30 @@ ntpclient inbound $ntp_servers
 run iptables -I INPUT -d 212.13.198.78 -j DROP
 run ip6tables -I INPUT -d 2001:ba8:0:1d9::ffff -j DROP
 
+## 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
+
 m4_divert(-1)
 ###----- That's all, folks --------------------------------------------------