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, 16 insertions, 2 deletions

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 9648b0dc57ef..e16a3690bdb2 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -27,6 +27,7 @@
 #include "hash.h"
 #include "originator.h"
 #include "routing.h"
+#include "bridge_loop_avoidance.h"
 
 #include <linux/crc16.h>
 
@@ -1615,10 +1616,15 @@ out:
 bool send_tt_response(struct bat_priv *bat_priv,
                       struct tt_query_packet *tt_request)
 {
-        if (is_my_mac(tt_request->dst))
+        if (is_my_mac(tt_request->dst)) {
+                /* don't answer backbone gws! */
+                if (bla_is_backbone_gw_orig(bat_priv, tt_request->src))
+                        return true;
+
                 return send_my_tt_response(bat_priv, tt_request);
-        else
+        } else {
                 return send_other_tt_response(bat_priv, tt_request);
+        }
 }
 
 static void _tt_update_changes(struct bat_priv *bat_priv,
@@ -1722,6 +1728,10 @@ void handle_tt_response(struct bat_priv *bat_priv,
                 tt_response->src, tt_response->ttvn, tt_response->tt_data,
                 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
 
+        /* we should have never asked a backbone gw */
+        if (bla_is_backbone_gw_orig(bat_priv, tt_response->src))
+                goto out;
+
         orig_node = orig_hash_find(bat_priv, tt_response->src);
         if (!orig_node)
                 goto out;
@@ -2052,6 +2062,10 @@ void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node,
         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
         bool full_table = true;
 
+        /* don't care about a backbone gateways updates. */
+        if (bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
+                return;
+
         /* orig table not initialised AND first diff is in the OGM OR the ttvn
          * increased by one -> we can apply the attached changes */
         if ((!orig_node->tt_initialised && ttvn == 1) ||