batman-adv: add bridge loop avoidance compile option

The define CONFIG_BATMAN_ADV_BLA switches the bridge loop avoidance
on - skip it, and the bridge loop avoidance is not compiled in.

This is useful if binary size should be saved or the feature is
not needed.

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

net/batman-adv/types.h

@@ -140,11 +140,13 @@ struct neigh_node {
 	spinlock_t tq_lock;	/* protects: tq_recv, tq_index */
 };
 
+#ifdef CONFIG_BATMAN_ADV_BLA
 struct bcast_duplist_entry {
 	uint8_t orig[ETH_ALEN];
 	uint16_t crc;
 	unsigned long entrytime;
 };
+#endif
 
 struct bat_priv {
 	atomic_t mesh_state;
@@ -186,14 +188,18 @@ struct bat_priv {
 	struct hashtable_t *orig_hash;
 	struct hashtable_t *tt_local_hash;
 	struct hashtable_t *tt_global_hash;
+#ifdef CONFIG_BATMAN_ADV_BLA
 	struct hashtable_t *claim_hash;
 	struct hashtable_t *backbone_hash;
+#endif
 	struct list_head tt_req_list; /* list of pending tt_requests */
 	struct list_head tt_roam_list;
 	struct hashtable_t *vis_hash;
+#ifdef CONFIG_BATMAN_ADV_BLA
 	struct bcast_duplist_entry bcast_duplist[DUPLIST_SIZE];
 	int bcast_duplist_curr;
 	struct bla_claim_dst claim_dest;
+#endif
 	spinlock_t forw_bat_list_lock; /* protects forw_bat_list */
 	spinlock_t forw_bcast_list_lock; /* protects  */
 	spinlock_t tt_changes_list_lock; /* protects tt_changes */
@@ -261,6 +267,7 @@ struct tt_orig_list_entry {
 	struct hlist_node list;
 };
 
+#ifdef CONFIG_BATMAN_ADV_BLA
 struct backbone_gw {
 	uint8_t orig[ETH_ALEN];
 	short vid;		/* used VLAN ID */
@@ -282,6 +289,7 @@ struct claim {
 	atomic_t refcount;
 	struct hlist_node hash_entry;
 };
+#endif
 
 struct tt_change_node {
 	struct list_head list;