netfilter: ebtables: Add string filter

This patch is part of a proposal to add a string filter to
ebtables, which would be similar to the string filter in
iptables. Like iptables, the ebtables filter uses the xt_string
module.

Signed-off-by: Bernie Harris <bernie.harris@alliedtelesis.co.nz>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/xt_string.c

@@ -21,6 +21,7 @@ MODULE_DESCRIPTION("Xtables: string-based matching");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("ipt_string");
 MODULE_ALIAS("ip6t_string");
+MODULE_ALIAS("ebt_string");
 
 static bool
 string_mt(const struct sk_buff *skb, struct xt_action_param *par)