batman-adv: make the backbone gw check VLAN specific

The backbone gw check has to be VLAN specific so that code
using it can specify VID where the check has to be done.

In the TT code, the check has been moved into the
tt_global_add() function so that it can be performed on a
per-entry basis instead of ignoring all the TT data received
from another backbone node. Only TT global entries belonging
to the VLAN where the backbone node is connected to are
skipped.
All the other spots where the TT code was checking whether a
node is a backbone have been removed.

Moreover, batadv_bla_is_backbone_gw_orig() now returns bool
since it used to return only 1 or 0.

Cc: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>

1 files changed, 11 insertions, 8 deletions

diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c
index 3b3867db88a7..28eb5e6d0a02 100644
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -1315,12 +1315,14 @@ out:
 
 /* @bat_priv: the bat priv with all the soft interface information
  * @orig: originator mac address
+ * @vid: VLAN identifier
  *
- * check if the originator is a gateway for any VLAN ID.
+ * Check if the originator is a gateway for the VLAN identified by vid.
  *
- * returns 1 if it is found, 0 otherwise
+ * Returns true if orig is a backbone for this vid, false otherwise.
  */
-int batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig)
+bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig,
+				    unsigned short vid)
 {
 	struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
 	struct hlist_head *head;
@@ -1328,25 +1330,26 @@ int batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig)
 	int i;
 
 	if (!atomic_read(&bat_priv->bridge_loop_avoidance))
-		return 0;
+		return false;
 
 	if (!hash)
-		return 0;
+		return false;
 
 	for (i = 0; i < hash->size; i++) {
 		head = &hash->table[i];
 
 		rcu_read_lock();
 		hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
-			if (batadv_compare_eth(backbone_gw->orig, orig)) {
+			if (batadv_compare_eth(backbone_gw->orig, orig) &&
+			    backbone_gw->vid == vid) {
 				rcu_read_unlock();
-				return 1;
+				return true;
 			}
 		}
 		rcu_read_unlock();
 	}
 
-	return 0;
+	return false;
 }