batman-adv: don't let backbone gateways exchange tt entries

As the backbone gateways are connected to the same backbone, they
should announce the same clients on the backbone non-exclusively.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index a1d8c9b0f902..1d1fd04c9c3a 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -673,6 +673,13 @@ int recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if)
         if (!is_my_mac(roam_adv_packet->dst))
                 return route_unicast_packet(skb, recv_if);
 
+        /* check if it is a backbone gateway. we don't accept
+         * roaming advertisement from it, as it has the same
+         * entries as we have.
+         */
+        if (bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src))
+                goto out;
+
         orig_node = orig_hash_find(bat_priv, roam_adv_packet->src);
         if (!orig_node)
                 goto out;