xtables: arp: inhibit -l option so only a fixed 6 bytes length arhln can be used
This is a temporary workaround mechanism until variable interface
hardware address length can be handled through nftables. This
defaults on the length of EUI-64 mac address, which should be the
most common usage until this is appropriately fixed for all type
of layer 2 addresses.
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/iptables/xtables-arp.c b/iptables/xtables-arp.c
index 046ae41..298801b 100644
--- a/iptables/xtables-arp.c
+++ b/iptables/xtables-arp.c
@@ -1145,6 +1145,13 @@
invert);
getlength_and_mask(argv[optind - 1], &fw.arp.arhln,
&fw.arp.arhln_mask);
+
+ if (fw.arp.arhln != 6) {
+ xtables_error(PARAMETER_PROBLEM,
+ "Only harware address length of"
+ " 6 is supported currently.");
+ }
+
break;
case 8:/* protocol length */
