Merge tag 'batman-adv-for-davem' of git://git.open-mesh.org/linux-merge

Antonio Quartulli says:

====================
this is another batch intended for net-next/linux-3.13.

This pull request is a bit bigger than usual, but 6 patches are very small
(three of them are about email updates)..

Patch 1 is fixing a previous merge conflict resolution that went wrong
(I realised that only now while checking other patches..).
Patches from 2 to 4 that are updating our emails in all the proper files
(Documentation/, headers and MAINTAINERS).

Patches 5, 6 and 7 are bringing a big improvement to the TranslationTable
component: it is now able to group non-mesh clients based on the VLAN they
belong to. In this way a lot a new enhancements are now possible thanks to the
fact that each batman-adv behaviour can be applied on a per VLAN basis.

And, of course, in patches from 8 to 12 you have some of the enhancements I was
talking about:
- make the batman-Gateway selection VLAN dependent
- make DAT (Distributed ARP Table) group ARP entries on a VLAN basis (this
  allows DAT to work even when the admin decided to use the same IP subnet on
  different VLANs)
- make the AP-Isolation behaviour switchable on each VLAN independently
- export VLAN specific attributes via sysfs. Switches like the AP-Isolation are
  now exported once per VLAN (backward compatibility of the sysfs interface has
  been preserved)

Patches 13 and 14 are small code cleanups.
Patch 15 is a minor improvement in the TT locking mechanism.

Patches 16 and 17 are other enhancements to the TT component. Those allow a
node to parse a "non-mesh client announcement message" and accept only those
TT entries belonging to certain VLANs.

Patch 18 exploits this parse&accept mechanism to make the Bridge Loop Avoidance
component reject only TT entries connected to the VLAN where it is operating.
Previous to this change, BLA was rejecting all the entries coming from any other
Backbone node, regardless of the VLAN (for more details about how the Bridge
Loop Avoidance works please check [1]).

[1] http://www.open-mesh.org/projects/batman-adv/wiki/Bridge-loop-avoidance-II
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 898 insertions, 259 deletions

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index b521afb186d4..7731eaed737d 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -34,6 +34,7 @@ static struct lock_class_key batadv_tt_local_hash_lock_class_key;
 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
 
 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
+				 unsigned short vid,
 				 struct batadv_orig_node *orig_node);
 static void batadv_tt_purge(struct work_struct *work);
 static void
@@ -41,7 +42,8 @@ batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
 				 struct batadv_orig_node *orig_node,
 				 const unsigned char *addr,
-				 const char *message, bool roaming);
+				 unsigned short vid, const char *message,
+				 bool roaming);
 
 /* returns 1 if they are the same mac addr */
 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
@@ -52,43 +54,93 @@ static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
 	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 }
 
+/**
+ * batadv_choose_tt - return the index of the tt entry in the hash table
+ * @data: pointer to the tt_common_entry object to map
+ * @size: the size of the hash table
+ *
+ * Returns the hash index where the object represented by 'data' should be
+ * stored at.
+ */
+static inline uint32_t batadv_choose_tt(const void *data, uint32_t size)
+{
+	struct batadv_tt_common_entry *tt;
+	uint32_t hash = 0;
+
+	tt = (struct batadv_tt_common_entry *)data;
+	hash = batadv_hash_bytes(hash, &tt->addr, ETH_ALEN);
+	hash = batadv_hash_bytes(hash, &tt->vid, sizeof(tt->vid));
+
+	hash += (hash << 3);
+	hash ^= (hash >> 11);
+	hash += (hash << 15);
+
+	return hash % size;
+}
+
+/**
+ * batadv_tt_hash_find - look for a client in the given hash table
+ * @hash: the hash table to search
+ * @addr: the mac address of the client to look for
+ * @vid: VLAN identifier
+ *
+ * Returns a pointer to the tt_common struct belonging to the searched client if
+ * found, NULL otherwise.
+ */
 static struct batadv_tt_common_entry *
-batadv_tt_hash_find(struct batadv_hashtable *hash, const void *data)
+batadv_tt_hash_find(struct batadv_hashtable *hash, const uint8_t *addr,
+		    unsigned short vid)
 {
 	struct hlist_head *head;
-	struct batadv_tt_common_entry *tt_common_entry;
-	struct batadv_tt_common_entry *tt_common_entry_tmp = NULL;
+	struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
 	uint32_t index;
 
 	if (!hash)
 		return NULL;
 
-	index = batadv_choose_orig(data, hash->size);
+	memcpy(to_search.addr, addr, ETH_ALEN);
+	to_search.vid = vid;
+
+	index = batadv_choose_tt(&to_search, hash->size);
 	head = &hash->table[index];
 
 	rcu_read_lock();
-	hlist_for_each_entry_rcu(tt_common_entry, head, hash_entry) {
-		if (!batadv_compare_eth(tt_common_entry, data))
+	hlist_for_each_entry_rcu(tt, head, hash_entry) {
+		if (!batadv_compare_eth(tt, addr))
 			continue;
 
-		if (!atomic_inc_not_zero(&tt_common_entry->refcount))
+		if (tt->vid != vid)
 			continue;
 
-		tt_common_entry_tmp = tt_common_entry;
+		if (!atomic_inc_not_zero(&tt->refcount))
+			continue;
+
+		tt_tmp = tt;
 		break;
 	}
 	rcu_read_unlock();
 
-	return tt_common_entry_tmp;
+	return tt_tmp;
 }
 
+/**
+ * batadv_tt_local_hash_find - search the local table for a given client
+ * @bat_priv: the bat priv with all the soft interface information
+ * @addr: the mac address of the client to look for
+ * @vid: VLAN identifier
+ *
+ * Returns a pointer to the corresponding tt_local_entry struct if the client is
+ * found, NULL otherwise.
+ */
 static struct batadv_tt_local_entry *
-batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const void *data)
+batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
+			  unsigned short vid)
 {
 	struct batadv_tt_common_entry *tt_common_entry;
 	struct batadv_tt_local_entry *tt_local_entry = NULL;
 
-	tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, data);
+	tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
+					      vid);
 	if (tt_common_entry)
 		tt_local_entry = container_of(tt_common_entry,
 					      struct batadv_tt_local_entry,
@@ -96,13 +148,24 @@ batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const void *data)
 	return tt_local_entry;
 }
 
+/**
+ * batadv_tt_global_hash_find - search the global table for a given client
+ * @bat_priv: the bat priv with all the soft interface information
+ * @addr: the mac address of the client to look for
+ * @vid: VLAN identifier
+ *
+ * Returns a pointer to the corresponding tt_global_entry struct if the client
+ * is found, NULL otherwise.
+ */
 static struct batadv_tt_global_entry *
-batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const void *data)
+batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
+			   unsigned short vid)
 {
 	struct batadv_tt_common_entry *tt_common_entry;
 	struct batadv_tt_global_entry *tt_global_entry = NULL;
 
-	tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, data);
+	tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
+					      vid);
 	if (tt_common_entry)
 		tt_global_entry = container_of(tt_common_entry,
 					       struct batadv_tt_global_entry,
@@ -145,13 +208,107 @@ static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
 	kfree(orig_entry);
 }
 
+/**
+ * batadv_tt_local_size_mod - change the size by v of the local table identified
+ *  by vid
+ * @bat_priv: the bat priv with all the soft interface information
+ * @vid: the VLAN identifier of the sub-table to change
+ * @v: the amount to sum to the local table size
+ */
+static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
+				     unsigned short vid, int v)
+{
+	struct batadv_softif_vlan *vlan;
+
+	vlan = batadv_softif_vlan_get(bat_priv, vid);
+	if (!vlan)
+		return;
+
+	atomic_add(v, &vlan->tt.num_entries);
+
+	batadv_softif_vlan_free_ref(vlan);
+}
+
+/**
+ * batadv_tt_local_size_inc - increase by one the local table size for the given
+ *  vid
+ * @bat_priv: the bat priv with all the soft interface information
+ * @vid: the VLAN identifier
+ */
+static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
+				     unsigned short vid)
+{
+	batadv_tt_local_size_mod(bat_priv, vid, 1);
+}
+
+/**
+ * batadv_tt_local_size_dec - decrease by one the local table size for the given
+ *  vid
+ * @bat_priv: the bat priv with all the soft interface information
+ * @vid: the VLAN identifier
+ */
+static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
+				     unsigned short vid)
+{
+	batadv_tt_local_size_mod(bat_priv, vid, -1);
+}
+
+/**
+ * batadv_tt_global_size_mod - change the size by v of the local table
+ *  identified by vid
+ * @bat_priv: the bat priv with all the soft interface information
+ * @vid: the VLAN identifier
+ * @v: the amount to sum to the global table size
+ */
+static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
+				      unsigned short vid, int v)
+{
+	struct batadv_orig_node_vlan *vlan;
+
+	vlan = batadv_orig_node_vlan_new(orig_node, vid);
+	if (!vlan)
+		return;
+
+	if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
+		spin_lock_bh(&orig_node->vlan_list_lock);
+		list_del_rcu(&vlan->list);
+		spin_unlock_bh(&orig_node->vlan_list_lock);
+		batadv_orig_node_vlan_free_ref(vlan);
+	}
+
+	batadv_orig_node_vlan_free_ref(vlan);
+}
+
+/**
+ * batadv_tt_global_size_inc - increase by one the global table size for the
+ *  given vid
+ * @orig_node: the originator which global table size has to be decreased
+ * @vid: the vlan identifier
+ */
+static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
+				      unsigned short vid)
+{
+	batadv_tt_global_size_mod(orig_node, vid, 1);
+}
+
+/**
+ * batadv_tt_global_size_dec - decrease by one the global table size for the
+ *  given vid
+ * @orig_node: the originator which global table size has to be decreased
+ * @vid: the vlan identifier
+ */
+static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
+				      unsigned short vid)
+{
+	batadv_tt_global_size_mod(orig_node, vid, -1);
+}
+
 static void
 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
 {
 	if (!atomic_dec_and_test(&orig_entry->refcount))
 		return;
-	/* to avoid race conditions, immediately decrease the tt counter */
-	atomic_dec(&orig_entry->orig_node->tt_size);
+
 	call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
 }
 
@@ -178,6 +335,7 @@ static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 	tt_change_node->change.flags = flags;
 	tt_change_node->change.reserved = 0;
 	memcpy(tt_change_node->change.addr, common->addr, ETH_ALEN);
+	tt_change_node->change.vid = htons(common->vid);
 
 	del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 
@@ -264,16 +422,26 @@ static void batadv_tt_global_free(struct batadv_priv *bat_priv,
 				  const char *message)
 {
 	batadv_dbg(BATADV_DBG_TT, bat_priv,
-		   "Deleting global tt entry %pM: %s\n",
-		   tt_global->common.addr, message);
+		   "Deleting global tt entry %pM (vid: %d): %s\n",
+		   tt_global->common.addr,
+		   BATADV_PRINT_VID(tt_global->common.vid), message);
 
 	batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
-			   batadv_choose_orig, tt_global->common.addr);
+			   batadv_choose_tt, &tt_global->common);
 	batadv_tt_global_entry_free_ref(tt_global);
 }
 
+/**
+ * batadv_tt_local_add - add a new client to the local table or update an
+ *  existing client
+ * @soft_iface: netdev struct of the mesh interface
+ * @addr: the mac address of the client to add
+ * @vid: VLAN identifier
+ * @ifindex: index of the interface where the client is connected to (useful to
+ *  identify wireless clients)
+ */
 void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
-			 int ifindex)
+			 unsigned short vid, int ifindex)
 {
 	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 	struct batadv_tt_local_entry *tt_local;
@@ -283,14 +451,15 @@ void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 	int hash_added;
 	bool roamed_back = false;
 
-	tt_local = batadv_tt_local_hash_find(bat_priv, addr);
-	tt_global = batadv_tt_global_hash_find(bat_priv, addr);
+	tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
+	tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 
 	if (tt_local) {
 		tt_local->last_seen = jiffies;
 		if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
 			batadv_dbg(BATADV_DBG_TT, bat_priv,
-				   "Re-adding pending client %pM\n", addr);
+				   "Re-adding pending client %pM (vid: %d)\n",
+				   addr, BATADV_PRINT_VID(vid));
 			/* whatever the reason why the PENDING flag was set,
 			 * this is a client which was enqueued to be removed in
 			 * this orig_interval. Since it popped up again, the
@@ -302,8 +471,8 @@ void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 
 		if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
 			batadv_dbg(BATADV_DBG_TT, bat_priv,
-				   "Roaming client %pM came back to its original location\n",
-				   addr);
+				   "Roaming client %pM (vid: %d) came back to its original location\n",
+				   addr, BATADV_PRINT_VID(vid));
 			/* the ROAM flag is set because this client roamed away
 			 * and the node got a roaming_advertisement message. Now
 			 * that the client popped up again at its original
@@ -320,7 +489,8 @@ void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 		goto out;
 
 	batadv_dbg(BATADV_DBG_TT, bat_priv,
-		   "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
+		   "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
+		   addr, BATADV_PRINT_VID(vid),
 		   (uint8_t)atomic_read(&bat_priv->tt.vn));
 
 	memcpy(tt_local->common.addr, addr, ETH_ALEN);
@@ -329,6 +499,7 @@ void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 	 * (consistency check)
 	 */
 	tt_local->common.flags = BATADV_TT_CLIENT_NEW;
+	tt_local->common.vid = vid;
 	if (batadv_is_wifi_iface(ifindex))
 		tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 	atomic_set(&tt_local->common.refcount, 2);
@@ -340,7 +511,7 @@ void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 		tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 
 	hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
-				     batadv_choose_orig, &tt_local->common,
+				     batadv_choose_tt, &tt_local->common,
 				     &tt_local->common.hash_entry);
 
 	if (unlikely(hash_added != 0)) {
@@ -362,6 +533,7 @@ check_roaming:
 		rcu_read_lock();
 		hlist_for_each_entry_rcu(orig_entry, head, list) {
 			batadv_send_roam_adv(bat_priv, tt_global->common.addr,
+					     tt_global->common.vid,
 					     orig_entry->orig_node);
 		}
 		rcu_read_unlock();
@@ -386,6 +558,149 @@ out:
 }
 
 /**
+ * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
+ *  within a TT Response directed to another node
+ * @orig_node: originator for which the TT data has to be prepared
+ * @tt_data: uninitialised pointer to the address of the TVLV buffer
+ * @tt_change: uninitialised pointer to the address of the area where the TT
+ *  changed can be stored
+ * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
+ *  function reserves the amount of space needed to send the entire global TT
+ *  table. In case of success the value is updated with the real amount of
+ *  reserved bytes
+
+ * Allocate the needed amount of memory for the entire TT TVLV and write its
+ * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
+ * objects, one per active VLAN served by the originator node.
+ *
+ * Return the size of the allocated buffer or 0 in case of failure.
+ */
+static uint16_t
+batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
+				   struct batadv_tvlv_tt_data **tt_data,
+				   struct batadv_tvlv_tt_change **tt_change,
+				   int32_t *tt_len)
+{
+	uint16_t num_vlan = 0, num_entries = 0, change_offset, tvlv_len;
+	struct batadv_tvlv_tt_vlan_data *tt_vlan;
+	struct batadv_orig_node_vlan *vlan;
+	uint8_t *tt_change_ptr;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
+		num_vlan++;
+		num_entries += atomic_read(&vlan->tt.num_entries);
+	}
+
+	change_offset = sizeof(**tt_data);
+	change_offset += num_vlan * sizeof(*tt_vlan);
+
+	/* if tt_len is negative, allocate the space needed by the full table */
+	if (*tt_len < 0)
+		*tt_len = batadv_tt_len(num_entries);
+
+	tvlv_len = *tt_len;
+	tvlv_len += change_offset;
+
+	*tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
+	if (!*tt_data) {
+		*tt_len = 0;
+		goto out;
+	}
+
+	(*tt_data)->flags = BATADV_NO_FLAGS;
+	(*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
+	(*tt_data)->num_vlan = htons(num_vlan);
+
+	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
+	list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
+		tt_vlan->vid = htons(vlan->vid);
+		tt_vlan->crc = htonl(vlan->tt.crc);
+
+		tt_vlan++;
+	}
+
+	tt_change_ptr = (uint8_t *)*tt_data + change_offset;
+	*tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
+
+out:
+	rcu_read_unlock();
+	return tvlv_len;
+}
+
+/**
+ * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
+ *  node
+ * @bat_priv: the bat priv with all the soft interface information
+ * @tt_data: uninitialised pointer to the address of the TVLV buffer
+ * @tt_change: uninitialised pointer to the address of the area where the TT
+ *  changes can be stored
+ * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
+ *  function reserves the amount of space needed to send the entire local TT
+ *  table. In case of success the value is updated with the real amount of
+ *  reserved bytes
+ *
+ * Allocate the needed amount of memory for the entire TT TVLV and write its
+ * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
+ * objects, one per active VLAN.
+ *
+ * Return the size of the allocated buffer or 0 in case of failure.
+ */
+static uint16_t
+batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
+				  struct batadv_tvlv_tt_data **tt_data,
+				  struct batadv_tvlv_tt_change **tt_change,
+				  int32_t *tt_len)
+{
+	struct batadv_tvlv_tt_vlan_data *tt_vlan;
+	struct batadv_softif_vlan *vlan;
+	uint16_t num_vlan = 0, num_entries = 0, tvlv_len;
+	uint8_t *tt_change_ptr;
+	int change_offset;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
+		num_vlan++;
+		num_entries += atomic_read(&vlan->tt.num_entries);
+	}
+
+	change_offset = sizeof(**tt_data);
+	change_offset += num_vlan * sizeof(*tt_vlan);
+
+	/* if tt_len is negative, allocate the space needed by the full table */
+	if (*tt_len < 0)
+		*tt_len = batadv_tt_len(num_entries);
+
+	tvlv_len = *tt_len;
+	tvlv_len += change_offset;
+
+	*tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
+	if (!*tt_data) {
+		tvlv_len = 0;
+		goto out;
+	}
+
+	(*tt_data)->flags = BATADV_NO_FLAGS;
+	(*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
+	(*tt_data)->num_vlan = htons(num_vlan);
+
+	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
+	hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
+		tt_vlan->vid = htons(vlan->vid);
+		tt_vlan->crc = htonl(vlan->tt.crc);
+
+		tt_vlan++;
+	}
+
+	tt_change_ptr = (uint8_t *)*tt_data + change_offset;
+	*tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
+
+out:
+	rcu_read_unlock();
+	return tvlv_len;
+}
+
+/**
  * batadv_tt_tvlv_container_update - update the translation table tvlv container
  *  after local tt changes have been committed
  * @bat_priv: the bat priv with all the soft interface information
@@ -395,10 +710,12 @@ static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 	struct batadv_tt_change_node *entry, *safe;
 	struct batadv_tvlv_tt_data *tt_data;
 	struct batadv_tvlv_tt_change *tt_change;
-	int tt_diff_len = 0, tt_change_len = 0;
+	int tt_diff_len, tt_change_len = 0;
 	int tt_diff_entries_num = 0, tt_diff_entries_count = 0;
+	uint16_t tvlv_len;
 
-	tt_diff_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes));
+	tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
+	tt_diff_len = batadv_tt_len(tt_diff_entries_num);
 
 	/* if we have too many changes for one packet don't send any
 	 * and wait for the tt table request which will be fragmented
@@ -406,24 +723,19 @@ static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 	if (tt_diff_len > bat_priv->soft_iface->mtu)
 		tt_diff_len = 0;
 
-	tt_data = kzalloc(sizeof(*tt_data) + tt_diff_len, GFP_ATOMIC);
-	if (!tt_data)
+	tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
+						     &tt_change, &tt_diff_len);
+	if (!tvlv_len)
 		return;
 
 	tt_data->flags = BATADV_TT_OGM_DIFF;
-	tt_data->ttvn = atomic_read(&bat_priv->tt.vn);
-	tt_data->crc = htonl(bat_priv->tt.local_crc);
 
 	if (tt_diff_len == 0)
 		goto container_register;
 
-	tt_diff_entries_num = batadv_tt_entries(tt_diff_len);
-
 	spin_lock_bh(&bat_priv->tt.changes_list_lock);
 	atomic_set(&bat_priv->tt.local_changes, 0);
 
-	tt_change = (struct batadv_tvlv_tt_change *)(tt_data + 1);
-
 	list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 				 list) {
 		if (tt_diff_entries_count < tt_diff_entries_num) {
@@ -459,7 +771,7 @@ static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 
 container_register:
 	batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
-				       sizeof(*tt_data) + tt_change_len);
+				       tvlv_len);
 	kfree(tt_data);
 }
 
@@ -471,7 +783,9 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 	struct batadv_tt_common_entry *tt_common_entry;
 	struct batadv_tt_local_entry *tt_local;
 	struct batadv_hard_iface *primary_if;
+	struct batadv_softif_vlan *vlan;
 	struct hlist_head *head;
+	unsigned short vid;
 	uint32_t i;
 	int last_seen_secs;
 	int last_seen_msecs;
@@ -484,11 +798,10 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 		goto out;
 
 	seq_printf(seq,
-		   "Locally retrieved addresses (from %s) announced via TT (TTVN: %u CRC: %#.8x):\n",
-		   net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn),
-		   bat_priv->tt.local_crc);
-	seq_printf(seq, "       %-13s %-7s %-10s\n", "Client", "Flags",
-		   "Last seen");
+		   "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
+		   net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
+	seq_printf(seq, "       %-13s  %s %-7s %-9s (%-10s)\n", "Client", "VID",
+		   "Flags", "Last seen", "CRC");
 
 	for (i = 0; i < hash->size; i++) {
 		head = &hash->table[i];
@@ -499,6 +812,7 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 			tt_local = container_of(tt_common_entry,
 						struct batadv_tt_local_entry,
 						common);
+			vid = tt_common_entry->vid;
 			last_seen_jiffies = jiffies - tt_local->last_seen;
 			last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 			last_seen_secs = last_seen_msecs / 1000;
@@ -506,8 +820,17 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 
 			no_purge = tt_common_entry->flags & np_flag;
 
-			seq_printf(seq, " * %pM [%c%c%c%c%c] %3u.%03u\n",
+			vlan = batadv_softif_vlan_get(bat_priv, vid);
+			if (!vlan) {
+				seq_printf(seq, "Cannot retrieve VLAN %d\n",
+					   BATADV_PRINT_VID(vid));
+				continue;
+			}
+
+			seq_printf(seq,
+				   " * %pM %4i [%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
 				   tt_common_entry->addr,
+				   BATADV_PRINT_VID(tt_common_entry->vid),
 				   (tt_common_entry->flags &
 				    BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
 				   no_purge ? 'P' : '.',
@@ -518,7 +841,10 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 				   (tt_common_entry->flags &
 				    BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
 				   no_purge ? 0 : last_seen_secs,
-				   no_purge ? 0 : last_seen_msecs);
+				   no_purge ? 0 : last_seen_msecs,
+				   vlan->tt.crc);
+
+			batadv_softif_vlan_free_ref(vlan);
 		}
 		rcu_read_unlock();
 	}
@@ -542,27 +868,29 @@ batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
 	tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
 
 	batadv_dbg(BATADV_DBG_TT, bat_priv,
-		   "Local tt entry (%pM) pending to be removed: %s\n",
-		   tt_local_entry->common.addr, message);
+		   "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
+		   tt_local_entry->common.addr,
+		   BATADV_PRINT_VID(tt_local_entry->common.vid), message);
 }
 
 /**
  * batadv_tt_local_remove - logically remove an entry from the local table
  * @bat_priv: the bat priv with all the soft interface information
  * @addr: the MAC address of the client to remove
+ * @vid: VLAN identifier
  * @message: message to append to the log on deletion
  * @roaming: true if the deletion is due to a roaming event
  *
  * Returns the flags assigned to the local entry before being deleted
  */
 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
-				const uint8_t *addr, const char *message,
-				bool roaming)
+				const uint8_t *addr, unsigned short vid,
+				const char *message, bool roaming)
 {
 	struct batadv_tt_local_entry *tt_local_entry;
 	uint16_t flags, curr_flags = BATADV_NO_FLAGS;
 
-	tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
+	tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
 	if (!tt_local_entry)
 		goto out;
 
@@ -779,7 +1107,7 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
 
 	INIT_HLIST_NODE(&orig_entry->list);
 	atomic_inc(&orig_node->refcount);
-	atomic_inc(&orig_node->tt_size);
+	batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
 	orig_entry->orig_node = orig_node;
 	orig_entry->ttvn = ttvn;
 	atomic_set(&orig_entry->refcount, 2);
@@ -798,6 +1126,7 @@ out:
  * @bat_priv: the bat priv with all the soft interface information
  * @orig_node: the originator announcing the client
  * @tt_addr: the mac address of the non-mesh client
+ * @vid: VLAN identifier
  * @flags: TT flags that have to be set for this non-mesh client
  * @ttvn: the tt version number ever announcing this non-mesh client
  *
@@ -813,7 +1142,8 @@ out:
  */
 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
 				 struct batadv_orig_node *orig_node,
-				 const unsigned char *tt_addr, uint16_t flags,
+				 const unsigned char *tt_addr,
+				 unsigned short vid, uint16_t flags,
 				 uint8_t ttvn)
 {
 	struct batadv_tt_global_entry *tt_global_entry;
@@ -823,8 +1153,12 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
 	struct batadv_tt_common_entry *common;
 	uint16_t local_flags;
 
-	tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr);
-	tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr);
+	/* ignore global entries from backbone nodes */
+	if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
+		return true;
+
+	tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
+	tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
 
 	/* if the node already has a local client for this entry, it has to wait
 	 * for a roaming advertisement instead of manually messing up the global
@@ -841,6 +1175,7 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
 
 		common = &tt_global_entry->common;
 		memcpy(common->addr, tt_addr, ETH_ALEN);
+		common->vid = vid;
 
 		common->flags = flags;
 		tt_global_entry->roam_at = 0;
@@ -858,7 +1193,7 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
 
 		hash_added = batadv_hash_add(bat_priv->tt.global_hash,
 					     batadv_compare_tt,
-					     batadv_choose_orig, common,
+					     batadv_choose_tt, common,
 					     &common->hash_entry);
 
 		if (unlikely(hash_added != 0)) {
@@ -917,14 +1252,15 @@ add_orig_entry:
 	batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
 
 	batadv_dbg(BATADV_DBG_TT, bat_priv,
-		   "Creating new global tt entry: %pM (via %pM)\n",
-		   common->addr, orig_node->orig);
+		   "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
+		   common->addr, BATADV_PRINT_VID(common->vid),
+		   orig_node->orig);
 	ret = true;
 
 out_remove:
 
 	/* remove address from local hash if present */
-	local_flags = batadv_tt_local_remove(bat_priv, tt_addr,
+	local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
 					     "global tt received",
 					     flags & BATADV_TT_CLIENT_ROAM);
 	tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
@@ -985,42 +1321,71 @@ static void
 batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry,
 			     struct seq_file *seq)
 {
-	struct hlist_head *head;
 	struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
 	struct batadv_tt_common_entry *tt_common_entry;
-	uint16_t flags;
+	struct batadv_orig_node_vlan *vlan;
+	struct hlist_head *head;
 	uint8_t last_ttvn;
+	uint16_t flags;
 
 	tt_common_entry = &tt_global_entry->common;
 	flags = tt_common_entry->flags;
 
 	best_entry = batadv_transtable_best_orig(tt_global_entry);
 	if (best_entry) {
+		vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
+						 tt_common_entry->vid);
+		if (!vlan) {
+			seq_printf(seq,
+				   " * Cannot retrieve VLAN %d for originator %pM\n",
+				   BATADV_PRINT_VID(tt_common_entry->vid),
+				   best_entry->orig_node->orig);
+			goto print_list;
+		}
+
 		last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
 		seq_printf(seq,
-			   " %c %pM  (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c]\n",
+			   " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c]\n",
 			   '*', tt_global_entry->common.addr,
+			   BATADV_PRINT_VID(tt_global_entry->common.vid),
 			   best_entry->ttvn, best_entry->orig_node->orig,
-			   last_ttvn, best_entry->orig_node->tt_crc,
+			   last_ttvn, vlan->tt.crc,
 			   (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
 			   (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
 			   (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
+
+		batadv_orig_node_vlan_free_ref(vlan);
 	}
 
+print_list:
 	head = &tt_global_entry->orig_list;
 
 	hlist_for_each_entry_rcu(orig_entry, head, list) {
 		if (best_entry == orig_entry)
 			continue;
 
+		vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
+						 tt_common_entry->vid);
+		if (!vlan) {
+			seq_printf(seq,
+				   " + Cannot retrieve VLAN %d for originator %pM\n",
+				   BATADV_PRINT_VID(tt_common_entry->vid),
+				   orig_entry->orig_node->orig);
+			continue;
+		}
+
 		last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
-		seq_printf(seq,	" %c %pM  (%3u) via %pM     (%3u)   [%c%c%c]\n",
+		seq_printf(seq,
+			   " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c]\n",
 			   '+', tt_global_entry->common.addr,
+			   BATADV_PRINT_VID(tt_global_entry->common.vid),
 			   orig_entry->ttvn, orig_entry->orig_node->orig,
-			   last_ttvn,
+			   last_ttvn, vlan->tt.crc,
 			   (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
 			   (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
 			   (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
+
+		batadv_orig_node_vlan_free_ref(vlan);
 	}
 }
 
@@ -1042,9 +1407,9 @@ int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
 	seq_printf(seq,
 		   "Globally announced TT entries received via the mesh %s\n",
 		   net_dev->name);
-	seq_printf(seq, "       %-13s %s       %-15s %s (%-10s) %s\n",
-		   "Client", "(TTVN)", "Originator", "(Curr TTVN)", "CRC",
-		   "Flags");
+	seq_printf(seq, "       %-13s  %s  %s       %-15s %s (%-10s) %s\n",
+		   "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
+		   "CRC", "Flags");
 
 	for (i = 0; i < hash->size; i++) {
 		head = &hash->table[i];
@@ -1077,6 +1442,8 @@ batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
 	head = &tt_global_entry->orig_list;
 	hlist_for_each_entry_safe(orig_entry, safe, head, list) {
 		hlist_del_rcu(&orig_entry->list);
+		batadv_tt_global_size_dec(orig_entry->orig_node,
+					  tt_global_entry->common.vid);
 		batadv_tt_orig_list_entry_free_ref(orig_entry);
 	}
 	spin_unlock_bh(&tt_global_entry->list_lock);
@@ -1091,16 +1458,21 @@ batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
 	struct hlist_head *head;
 	struct hlist_node *safe;
 	struct batadv_tt_orig_list_entry *orig_entry;
+	unsigned short vid;
 
 	spin_lock_bh(&tt_global_entry->list_lock);
 	head = &tt_global_entry->orig_list;
 	hlist_for_each_entry_safe(orig_entry, safe, head, list) {
 		if (orig_entry->orig_node == orig_node) {
+			vid = tt_global_entry->common.vid;
 			batadv_dbg(BATADV_DBG_TT, bat_priv,
-				   "Deleting %pM from global tt entry %pM: %s\n",
+				   "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
 				   orig_node->orig,
-				   tt_global_entry->common.addr, message);
+				   tt_global_entry->common.addr,
+				   BATADV_PRINT_VID(vid), message);
 			hlist_del_rcu(&orig_entry->list);
+			batadv_tt_global_size_dec(orig_node,
+						  tt_global_entry->common.vid);
 			batadv_tt_orig_list_entry_free_ref(orig_entry);
 		}
 	}
@@ -1147,17 +1519,25 @@ batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
 						orig_node, message);
 }
 
-
-
+/**
+ * batadv_tt_global_del - remove a client from the global table
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig_node: an originator serving this client
+ * @addr: the mac address of the client
+ * @vid: VLAN identifier
+ * @message: a message explaining the reason for deleting the client to print
+ *  for debugging purpose
+ * @roaming: true if the deletion has been triggered by a roaming event
+ */
 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
 				 struct batadv_orig_node *orig_node,
-				 const unsigned char *addr,
+				 const unsigned char *addr, unsigned short vid,
 				 const char *message, bool roaming)
 {
 	struct batadv_tt_global_entry *tt_global_entry;
 	struct batadv_tt_local_entry *local_entry = NULL;
 
-	tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
+	tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
 	if (!tt_global_entry)
 		goto out;
 
@@ -1186,7 +1566,8 @@ static void batadv_tt_global_del(struct batadv_priv *bat_priv,
 	 *    the global entry, since it is useless now.
 	 */
 	local_entry = batadv_tt_local_hash_find(bat_priv,
-						tt_global_entry->common.addr);
+						tt_global_entry->common.addr,
+						vid);
 	if (local_entry) {
 		/* local entry exists, case 2: client roamed to us. */
 		batadv_tt_global_del_orig_list(tt_global_entry);
@@ -1204,8 +1585,18 @@ out:
 		batadv_tt_local_entry_free_ref(local_entry);
 }
 
+/**
+ * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
+ *  given originator matching the provided vid
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig_node: the originator owning the entries to remove
+ * @match_vid: the VLAN identifier to match. If negative all the entries will be
+ *  removed
+ * @message: debug message to print as "reason"
+ */
 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
 			       struct batadv_orig_node *orig_node,
+			       int32_t match_vid,
 			       const char *message)
 {
 	struct batadv_tt_global_entry *tt_global;
@@ -1215,6 +1606,7 @@ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
 	struct hlist_node *safe;
 	struct hlist_head *head;
 	spinlock_t *list_lock; /* protects write access to the hash lists */
+	unsigned short vid;
 
 	if (!hash)
 		return;
@@ -1226,6 +1618,10 @@ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
 		spin_lock_bh(list_lock);
 		hlist_for_each_entry_safe(tt_common_entry, safe,
 					  head, hash_entry) {
+			/* remove only matching entries */
+			if (match_vid >= 0 && tt_common_entry->vid != match_vid)
+				continue;
+
 			tt_global = container_of(tt_common_entry,
 						 struct batadv_tt_global_entry,
 						 common);
@@ -1234,9 +1630,11 @@ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
 							orig_node, message);
 
 			if (hlist_empty(&tt_global->orig_list)) {
+				vid = tt_global->common.vid;
 				batadv_dbg(BATADV_DBG_TT, bat_priv,
-					   "Deleting global tt entry %pM: %s\n",
-					   tt_global->common.addr, message);
+					   "Deleting global tt entry %pM (vid: %d): %s\n",
+					   tt_global->common.addr,
+					   BATADV_PRINT_VID(vid), message);
 				hlist_del_rcu(&tt_common_entry->hash_entry);
 				batadv_tt_global_entry_free_ref(tt_global);
 			}
@@ -1294,8 +1692,10 @@ static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
 				continue;
 
 			batadv_dbg(BATADV_DBG_TT, bat_priv,
-				   "Deleting global tt entry (%pM): %s\n",
-				   tt_global->common.addr, msg);
+				   "Deleting global tt entry %pM (vid: %d): %s\n",
+				   tt_global->common.addr,
+				   BATADV_PRINT_VID(tt_global->common.vid),
+				   msg);
 
 			hlist_del_rcu(&tt_common->hash_entry);
 
@@ -1354,23 +1754,49 @@ _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
 	return ret;
 }
 
+/**
+ * batadv_transtable_search - get the mesh destination for a given client
+ * @bat_priv: the bat priv with all the soft interface information
+ * @src: mac address of the source client
+ * @addr: mac address of the destination client
+ * @vid: VLAN identifier
+ *
+ * Returns a pointer to the originator that was selected as destination in the
+ * mesh for contacting the client 'addr', NULL otherwise.
+ * In case of multiple originators serving the same client, the function returns
+ * the best one (best in terms of metric towards the destination node).
+ *
+ * If the two clients are AP isolated the function returns NULL.
+ */
 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
 						  const uint8_t *src,
-						  const uint8_t *addr)
+						  const uint8_t *addr,
+						  unsigned short vid)
 {
 	struct batadv_tt_local_entry *tt_local_entry = NULL;
 	struct batadv_tt_global_entry *tt_global_entry = NULL;
 	struct batadv_orig_node *orig_node = NULL;
 	struct batadv_tt_orig_list_entry *best_entry;
+	bool ap_isolation_enabled = false;
+	struct batadv_softif_vlan *vlan;
+
+	/* if the AP isolation is requested on a VLAN, then check for its
+	 * setting in the proper VLAN private data structure
+	 */
+	vlan = batadv_softif_vlan_get(bat_priv, vid);
+	if (vlan) {
+		ap_isolation_enabled = atomic_read(&vlan->ap_isolation);
+		batadv_softif_vlan_free_ref(vlan);
+	}
 
-	if (src && atomic_read(&bat_priv->ap_isolation)) {
-		tt_local_entry = batadv_tt_local_hash_find(bat_priv, src);
+	if (src && ap_isolation_enabled) {
+		tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
 		if (!tt_local_entry ||
 		    (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
 			goto out;
 	}
 
-	tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
+	tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
 	if (!tt_global_entry)
 		goto out;
 
@@ -1403,15 +1829,35 @@ out:
  * batadv_tt_global_crc - calculates the checksum of the local table belonging
  *  to the given orig_node
  * @bat_priv: the bat priv with all the soft interface information
+ * @orig_node: originator for which the CRC should be computed
+ * @vid: VLAN identifier for which the CRC32 has to be computed
+ *
+ * This function computes the checksum for the global table corresponding to a
+ * specific originator. In particular, the checksum is computed as follows: For
+ * each client connected to the originator the CRC32C of the MAC address and the
+ * VID is computed and then all the CRC32Cs of the various clients are xor'ed
+ * together.
+ *
+ * The idea behind is that CRC32C should be used as much as possible in order to
+ * produce a unique hash of the table, but since the order which is used to feed
+ * the CRC32C function affects the result and since every node in the network
+ * probably sorts the clients differently, the hash function cannot be directly
+ * computed over the entire table. Hence the CRC32C is used only on
+ * the single client entry, while all the results are then xor'ed together
+ * because the XOR operation can combine them all while trying to reduce the
+ * noise as much as possible.
+ *
+ * Returns the checksum of the global table of a given originator.
  */
 static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
-				     struct batadv_orig_node *orig_node)
+				     struct batadv_orig_node *orig_node,
+				     unsigned short vid)
 {
 	struct batadv_hashtable *hash = bat_priv->tt.global_hash;
 	struct batadv_tt_common_entry *tt_common;
 	struct batadv_tt_global_entry *tt_global;
 	struct hlist_head *head;
-	uint32_t i, crc = 0;
+	uint32_t i, crc_tmp, crc = 0;
 
 	for (i = 0; i < hash->size; i++) {
 		head = &hash->table[i];
@@ -1421,6 +1867,12 @@ static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
 			tt_global = container_of(tt_common,
 						 struct batadv_tt_global_entry,
 						 common);
+			/* compute the CRC only for entries belonging to the
+			 * VLAN identified by the vid passed as parameter
+			 */
+			if (tt_common->vid != vid)
+				continue;
+
 			/* Roaming clients are in the global table for
 			 * consistency only. They don't have to be
 			 * taken into account while computing the
@@ -1442,7 +1894,9 @@ static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
 							     orig_node))
 				continue;
 
-			crc ^= crc32c(0, tt_common->addr, ETH_ALEN);
+			crc_tmp = crc32c(0, &tt_common->vid,
+					 sizeof(tt_common->vid));
+			crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
 		}
 		rcu_read_unlock();
 	}
@@ -1453,26 +1907,41 @@ static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
 /**
  * batadv_tt_local_crc - calculates the checksum of the local table
  * @bat_priv: the bat priv with all the soft interface information
+ * @vid: VLAN identifier for which the CRC32 has to be computed
+ *
+ * For details about the computation, please refer to the documentation for
+ * batadv_tt_global_crc().
+ *
+ * Returns the checksum of the local table
  */
-static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv)
+static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv,
+				    unsigned short vid)
 {
 	struct batadv_hashtable *hash = bat_priv->tt.local_hash;
 	struct batadv_tt_common_entry *tt_common;
 	struct hlist_head *head;
-	uint32_t i, crc = 0;
+	uint32_t i, crc_tmp, crc = 0;
 
 	for (i = 0; i < hash->size; i++) {
 		head = &hash->table[i];
 
 		rcu_read_lock();
 		hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
+			/* compute the CRC only for entries belonging to the
+			 * VLAN identified by vid
+			 */
+			if (tt_common->vid != vid)
+				continue;
+
 			/* not yet committed clients have not to be taken into
 			 * account while computing the CRC
 			 */
 			if (tt_common->flags & BATADV_TT_CLIENT_NEW)
 				continue;
 
-			crc ^= crc32c(0, tt_common->addr, ETH_ALEN);
+			crc_tmp = crc32c(0, &tt_common->vid,
+					 sizeof(tt_common->vid));
+			crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
 		}
 		rcu_read_unlock();
 	}
@@ -1595,44 +2064,29 @@ static int batadv_tt_global_valid(const void *entry_ptr,
 }
 
 /**
- * batadv_tt_tvlv_generate - creates tvlv tt data buffer to fill it with the
- *  tt entries from the specified tt hash
+ * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
+ *  specified tt hash
  * @bat_priv: the bat priv with all the soft interface information
  * @hash: hash table containing the tt entries
  * @tt_len: expected tvlv tt data buffer length in number of bytes
+ * @tvlv_buff: pointer to the buffer to fill with the TT data
  * @valid_cb: function to filter tt change entries
  * @cb_data: data passed to the filter function as argument
- *
- * Returns pointer to allocated tvlv tt data buffer if operation was
- * successful or NULL otherwise.
  */
-static struct batadv_tvlv_tt_data *
-batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
-			struct batadv_hashtable *hash, uint16_t tt_len,
-			int (*valid_cb)(const void *, const void *),
-			void *cb_data)
+static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
+				    struct batadv_hashtable *hash,
+				    void *tvlv_buff, uint16_t tt_len,
+				    int (*valid_cb)(const void *, const void *),
+				    void *cb_data)
 {
 	struct batadv_tt_common_entry *tt_common_entry;
-	struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
 	struct batadv_tvlv_tt_change *tt_change;
 	struct hlist_head *head;
 	uint16_t tt_tot, tt_num_entries = 0;
-	ssize_t tvlv_tt_size = sizeof(struct batadv_tvlv_tt_data);
 	uint32_t i;
 
-	if (tvlv_tt_size + tt_len > bat_priv->soft_iface->mtu) {
-		tt_len = bat_priv->soft_iface->mtu - tvlv_tt_size;
-		tt_len -= tt_len % sizeof(struct batadv_tvlv_tt_change);
-	}
-
 	tt_tot = batadv_tt_entries(tt_len);
-
-	tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len,
-			       GFP_ATOMIC);
-	if (!tvlv_tt_data)
-		goto out;
-
-	tt_change = (struct batadv_tvlv_tt_change *)(tvlv_tt_data + 1);
+	tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
 
 	rcu_read_lock();
 	for (i = 0; i < hash->size; i++) {
@@ -1649,6 +2103,7 @@ batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
 			memcpy(tt_change->addr, tt_common_entry->addr,
 			       ETH_ALEN);
 			tt_change->flags = tt_common_entry->flags;
+			tt_change->vid = htons(tt_common_entry->vid);
 			tt_change->reserved = 0;
 
 			tt_num_entries++;
@@ -1656,9 +2111,91 @@ batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
 		}
 	}
 	rcu_read_unlock();
+}
 
-out:
-	return tvlv_tt_data;
+/**
+ * batadv_tt_global_check_crc - check if all the CRCs are correct
+ * @orig_node: originator for which the CRCs have to be checked
+ * @tt_vlan: pointer to the first tvlv VLAN entry
+ * @num_vlan: number of tvlv VLAN entries
+ * @create: if true, create VLAN objects if not found
+ *
+ * Return true if all the received CRCs match the locally stored ones, false
+ * otherwise
+ */
+static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
+				       struct batadv_tvlv_tt_vlan_data *tt_vlan,
+				       uint16_t num_vlan)
+{
+	struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
+	struct batadv_orig_node_vlan *vlan;
+	int i;
+
+	/* check if each received CRC matches the locally stored one */
+	for (i = 0; i < num_vlan; i++) {
+		tt_vlan_tmp = tt_vlan + i;
+
+		/* if orig_node is a backbone node for this VLAN, don't check
+		 * the CRC as we ignore all the global entries over it
+		 */
+		if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
+						   orig_node->orig,
+						   ntohs(tt_vlan_tmp->vid)))
+			continue;
+
+		vlan = batadv_orig_node_vlan_get(orig_node,
+						 ntohs(tt_vlan_tmp->vid));
+		if (!vlan)
+			return false;
+
+		if (vlan->tt.crc != ntohl(tt_vlan_tmp->crc))
+			return false;
+	}
+
+	return true;
+}
+
+/**
+ * batadv_tt_local_update_crc - update all the local CRCs
+ * @bat_priv: the bat priv with all the soft interface information
+ */
+static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
+{
+	struct batadv_softif_vlan *vlan;
+
+	/* recompute the global CRC for each VLAN */
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
+		vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
+	}
+	rcu_read_unlock();
+}
+
+/**
+ * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig_node: the orig_node for which the CRCs have to be updated
+ */
+static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
+					struct batadv_orig_node *orig_node)
+{
+	struct batadv_orig_node_vlan *vlan;
+	uint32_t crc;
+
+	/* recompute the global CRC for each VLAN */
+	rcu_read_lock();
+	list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
+		/* if orig_node is a backbone node for this VLAN, don't compute
+		 * the CRC as we ignore all the global entries over it
+		 */
+		if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
+						   vlan->vid))
+			continue;
+
+		crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
+		vlan->tt.crc = crc;
+	}
+	rcu_read_unlock();
 }
 
 /**
@@ -1666,19 +2203,23 @@ out:
  * @bat_priv: the bat priv with all the soft interface information
  * @dst_orig_node: the destination of the message
  * @ttvn: the version number that the source of the message is looking for
- * @tt_crc: the CRC associated with the version number
+ * @tt_vlan: pointer to the first tvlv VLAN object to request
+ * @num_vlan: number of tvlv VLAN entries
  * @full_table: ask for the entire translation table if true, while only for the
  *  last TT diff otherwise
  */
 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
 				  struct batadv_orig_node *dst_orig_node,
-				  uint8_t ttvn, uint32_t tt_crc,
-				  bool full_table)
+				  uint8_t ttvn,
+				  struct batadv_tvlv_tt_vlan_data *tt_vlan,
+				  uint16_t num_vlan, bool full_table)
 {
 	struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
-	struct batadv_hard_iface *primary_if;
 	struct batadv_tt_req_node *tt_req_node = NULL;
+	struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
+	struct batadv_hard_iface *primary_if;
 	bool ret = false;
+	int i, size;
 
 	primary_if = batadv_primary_if_get_selected(bat_priv);
 	if (!primary_if)
@@ -1691,13 +2232,26 @@ static int batadv_send_tt_request(struct batadv_priv *bat_priv,
 	if (!tt_req_node)
 		goto out;
 
-	tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data), GFP_ATOMIC);
+	size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
+	tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
 	if (!tvlv_tt_data)
 		goto out;
 
 	tvlv_tt_data->flags = BATADV_TT_REQUEST;
 	tvlv_tt_data->ttvn = ttvn;
-	tvlv_tt_data->crc = htonl(tt_crc);
+	tvlv_tt_data->num_vlan = htons(num_vlan);
+
+	/* send all the CRCs within the request. This is needed by intermediate
+	 * nodes to ensure they have the correct table before replying
+	 */
+	tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
+	for (i = 0; i < num_vlan; i++) {
+		tt_vlan_req->vid = tt_vlan->vid;
+		tt_vlan_req->crc = tt_vlan->crc;
+
+		tt_vlan_req++;
+		tt_vlan++;
+	}
 
 	if (full_table)
 		tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
@@ -1708,7 +2262,7 @@ static int batadv_send_tt_request(struct batadv_priv *bat_priv,
 	batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
 	batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
 				 dst_orig_node->orig, BATADV_TVLV_TT, 1,
-				 tvlv_tt_data, sizeof(*tvlv_tt_data));
+				 tvlv_tt_data, size);
 	ret = true;
 
 out:
@@ -1740,10 +2294,13 @@ static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
 {
 	struct batadv_orig_node *req_dst_orig_node;
 	struct batadv_orig_node *res_dst_orig_node = NULL;
+	struct batadv_tvlv_tt_change *tt_change;
 	struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
-	uint8_t orig_ttvn, req_ttvn;
-	uint16_t tt_len;
+	struct batadv_tvlv_tt_vlan_data *tt_vlan;
 	bool ret = false, full_table;
+	uint8_t orig_ttvn, req_ttvn;
+	uint16_t tvlv_len;
+	int32_t tt_len;
 
 	batadv_dbg(BATADV_DBG_TT, bat_priv,
 		   "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
@@ -1762,9 +2319,11 @@ static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
 	orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
 	req_ttvn = tt_data->ttvn;
 
+	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
 	/* this node doesn't have the requested data */
 	if (orig_ttvn != req_ttvn ||
-	    tt_data->crc != htonl(req_dst_orig_node->tt_crc))
+	    !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
+					ntohs(tt_data->num_vlan)))
 		goto out;
 
 	/* If the full table has been explicitly requested */
@@ -1781,26 +2340,34 @@ static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
 		spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
 		tt_len = req_dst_orig_node->tt_buff_len;
 
-		tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len,
-				       GFP_ATOMIC);
-		if (!tvlv_tt_data)
+		tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
+							      &tvlv_tt_data,
+							      &tt_change,
+							      &tt_len);
+		if (!tt_len)
 			goto unlock;
 
 		/* Copy the last orig_node's OGM buffer */
-		memcpy(tvlv_tt_data + 1, req_dst_orig_node->tt_buff,
+		memcpy(tt_change, req_dst_orig_node->tt_buff,
 		       req_dst_orig_node->tt_buff_len);
 		spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
 	} else {
-		tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size);
-		tt_len = batadv_tt_len(tt_len);
-
-		tvlv_tt_data = batadv_tt_tvlv_generate(bat_priv,
-						       bat_priv->tt.global_hash,
-						       tt_len,
-						       batadv_tt_global_valid,
-						       req_dst_orig_node);
-		if (!tvlv_tt_data)
+		/* allocate the tvlv, put the tt_data and all the tt_vlan_data
+		 * in the initial part
+		 */
+		tt_len = -1;
+		tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
+							      &tvlv_tt_data,
+							      &tt_change,
+							      &tt_len);
+		if (!tt_len)
 			goto out;
+
+		/* fill the rest of the tvlv with the real TT entries */
+		batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
+					tt_change, tt_len,
+					batadv_tt_global_valid,
+					req_dst_orig_node);
 	}
 
 	tvlv_tt_data->flags = BATADV_TT_RESPONSE;
@@ -1817,8 +2384,8 @@ static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
 	batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
 
 	batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
-				 req_src, BATADV_TVLV_TT, 1,
-				 tvlv_tt_data, sizeof(*tvlv_tt_data) + tt_len);
+				 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
+				 tvlv_len);
 
 	ret = true;
 	goto out;
@@ -1849,17 +2416,20 @@ static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
 				       uint8_t *req_src)
 {
 	struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
-	struct batadv_orig_node *orig_node;
 	struct batadv_hard_iface *primary_if = NULL;
+	struct batadv_tvlv_tt_change *tt_change;
+	struct batadv_orig_node *orig_node;
 	uint8_t my_ttvn, req_ttvn;
+	uint16_t tvlv_len;
 	bool full_table;
-	uint16_t tt_len;
+	int32_t tt_len;
 
 	batadv_dbg(BATADV_DBG_TT, bat_priv,
 		   "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
 		   req_src, tt_data->ttvn,
 		   (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
 
+	spin_lock_bh(&bat_priv->tt.commit_lock);
 
 	my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
 	req_ttvn = tt_data->ttvn;
@@ -1886,29 +2456,37 @@ static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
 	 */
 	if (!full_table) {
 		spin_lock_bh(&bat_priv->tt.last_changeset_lock);
-		tt_len = bat_priv->tt.last_changeset_len;
 
-		tvlv_tt_data = kzalloc(sizeof(*tvlv_tt_data) + tt_len,
-				       GFP_ATOMIC);
-		if (!tvlv_tt_data)
+		tt_len = bat_priv->tt.last_changeset_len;
+		tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
+							     &tvlv_tt_data,
+							     &tt_change,
+							     &tt_len);
+		if (!tt_len)
 			goto unlock;
 
 		/* Copy the last orig_node's OGM buffer */
-		memcpy(tvlv_tt_data + 1, bat_priv->tt.last_changeset,
+		memcpy(tt_change, bat_priv->tt.last_changeset,
 		       bat_priv->tt.last_changeset_len);
 		spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
 	} else {
-		tt_len = (uint16_t)atomic_read(&bat_priv->tt.local_entry_num);
-		tt_len = batadv_tt_len(tt_len);
 		req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
 
-		tvlv_tt_data = batadv_tt_tvlv_generate(bat_priv,
-						       bat_priv->tt.local_hash,
-						       tt_len,
-						       batadv_tt_local_valid,
-						       NULL);
-		if (!tvlv_tt_data)
+		/* allocate the tvlv, put the tt_data and all the tt_vlan_data
+		 * in the initial part
+		 */
+		tt_len = -1;
+		tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
+							     &tvlv_tt_data,
+							     &tt_change,
+							     &tt_len);
+		if (!tt_len)
 			goto out;
+
+		/* fill the rest of the tvlv with the real TT entries */
+		batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
+					tt_change, tt_len,
+					batadv_tt_local_valid, NULL);
 	}
 
 	tvlv_tt_data->flags = BATADV_TT_RESPONSE;
@@ -1924,14 +2502,15 @@ static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
 	batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
 
 	batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
-				 req_src, BATADV_TVLV_TT, 1,
-				 tvlv_tt_data, sizeof(*tvlv_tt_data) + tt_len);
+				 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
+				 tvlv_len);
 
 	goto out;
 
 unlock:
 	spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
 out:
+	spin_unlock_bh(&bat_priv->tt.commit_lock);
 	if (orig_node)
 		batadv_orig_node_free_ref(orig_node);
 	if (primary_if)
@@ -1954,16 +2533,11 @@ static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
 				    struct batadv_tvlv_tt_data *tt_data,
 				    uint8_t *req_src, uint8_t *req_dst)
 {
-	if (batadv_is_my_mac(bat_priv, req_dst)) {
-		/* don't answer backbone gws! */
-		if (batadv_bla_is_backbone_gw_orig(bat_priv, req_src))
-			return true;
-
+	if (batadv_is_my_mac(bat_priv, req_dst))
 		return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
-	} else {
+	else
 		return batadv_send_other_tt_response(bat_priv, tt_data,
 						     req_src, req_dst);
-	}
 }
 
 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
@@ -1979,11 +2553,13 @@ static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
 			roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
 			batadv_tt_global_del(bat_priv, orig_node,
 					     (tt_change + i)->addr,
+					     ntohs((tt_change + i)->vid),
 					     "tt removed by changes",
 					     roams);
 		} else {
 			if (!batadv_tt_global_add(bat_priv, orig_node,
 						  (tt_change + i)->addr,
+						  ntohs((tt_change + i)->vid),
 						  (tt_change + i)->flags, ttvn))
 				/* In case of problem while storing a
 				 * global_entry, we stop the updating
@@ -1998,8 +2574,9 @@ static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
 }
 
 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
-				  struct batadv_tvlv_tt_data *tt_data,
-				  uint8_t *resp_src, uint16_t num_entries)
+				  struct batadv_tvlv_tt_change *tt_change,
+				  uint8_t ttvn, uint8_t *resp_src,
+				  uint16_t num_entries)
 {
 	struct batadv_orig_node *orig_node;
 
@@ -2008,11 +2585,11 @@ static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
 		goto out;
 
 	/* Purge the old table first.. */
-	batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table");
+	batadv_tt_global_del_orig(bat_priv, orig_node, -1,
+				  "Received full table");
 
-	_batadv_tt_update_changes(bat_priv, orig_node,
-				  (struct batadv_tvlv_tt_change *)(tt_data + 1),
-				  num_entries, tt_data->ttvn);
+	_batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
+				  ttvn);
 
 	spin_lock_bh(&orig_node->tt_buff_lock);
 	kfree(orig_node->tt_buff);
@@ -2020,7 +2597,7 @@ static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
 	orig_node->tt_buff = NULL;
 	spin_unlock_bh(&orig_node->tt_buff_lock);
 
-	atomic_set(&orig_node->last_ttvn, tt_data->ttvn);
+	atomic_set(&orig_node->last_ttvn, ttvn);
 
 out:
 	if (orig_node)
@@ -2040,12 +2617,21 @@ static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
 	atomic_set(&orig_node->last_ttvn, ttvn);
 }
 
-bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr)
+/**
+ * batadv_is_my_client - check if a client is served by the local node
+ * @bat_priv: the bat priv with all the soft interface information
+ * @addr: the mac adress of the client to check
+ * @vid: VLAN identifier
+ *
+ * Returns true if the client is served by this node, false otherwise.
+ */
+bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr,
+			 unsigned short vid)
 {
 	struct batadv_tt_local_entry *tt_local_entry;
 	bool ret = false;
 
-	tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
+	tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
 	if (!tt_local_entry)
 		goto out;
 	/* Check if the client has been logically deleted (but is kept for
@@ -2075,28 +2661,39 @@ static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
 	struct batadv_tt_req_node *node, *safe;
 	struct batadv_orig_node *orig_node = NULL;
 	struct batadv_tvlv_tt_change *tt_change;
+	uint8_t *tvlv_ptr = (uint8_t *)tt_data;
+	uint16_t change_offset;
 
 	batadv_dbg(BATADV_DBG_TT, bat_priv,
 		   "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
 		   resp_src, tt_data->ttvn, num_entries,
 		   (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
 
-	/* we should have never asked a backbone gw */
-	if (batadv_bla_is_backbone_gw_orig(bat_priv, resp_src))
-		goto out;
-
 	orig_node = batadv_orig_hash_find(bat_priv, resp_src);
 	if (!orig_node)
 		goto out;
 
+	spin_lock_bh(&orig_node->tt_lock);
+
+	change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
+	change_offset *= ntohs(tt_data->num_vlan);
+	change_offset += sizeof(*tt_data);
+	tvlv_ptr += change_offset;
+
+	tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
 	if (tt_data->flags & BATADV_TT_FULL_TABLE) {
-		batadv_tt_fill_gtable(bat_priv, tt_data, resp_src, num_entries);
+		batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
+				      resp_src, num_entries);
 	} else {
-		tt_change = (struct batadv_tvlv_tt_change *)(tt_data + 1);
 		batadv_tt_update_changes(bat_priv, orig_node, num_entries,
 					 tt_data->ttvn, tt_change);
 	}
 
+	/* Recalculate the CRC for this orig_node and store it */
+	batadv_tt_global_update_crc(bat_priv, orig_node);
+
+	spin_unlock_bh(&orig_node->tt_lock);
+
 	/* Delete the tt_req_node from pending tt_requests list */
 	spin_lock_bh(&bat_priv->tt.req_list_lock);
 	list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
@@ -2105,10 +2702,8 @@ static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
 		list_del(&node->list);
 		kfree(node);
 	}
-	spin_unlock_bh(&bat_priv->tt.req_list_lock);
 
-	/* Recalculate the CRC for this orig_node and store it */
-	orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node);
+	spin_unlock_bh(&bat_priv->tt.req_list_lock);
 out:
 	if (orig_node)
 		batadv_orig_node_free_ref(orig_node);
@@ -2194,7 +2789,20 @@ unlock:
 	return ret;
 }
 
+/**
+ * batadv_send_roam_adv - send a roaming advertisement message
+ * @bat_priv: the bat priv with all the soft interface information
+ * @client: mac address of the roaming client
+ * @vid: VLAN identifier
+ * @orig_node: message destination
+ *
+ * Send a ROAMING_ADV message to the node which was previously serving this
+ * client. This is done to inform the node that from now on all traffic destined
+ * for this particular roamed client has to be forwarded to the sender of the
+ * roaming message.
+ */
 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
+				 unsigned short vid,
 				 struct batadv_orig_node *orig_node)
 {
 	struct batadv_hard_iface *primary_if;
@@ -2211,13 +2819,13 @@ static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
 		goto out;
 
 	batadv_dbg(BATADV_DBG_TT, bat_priv,
-		   "Sending ROAMING_ADV to %pM (client %pM)\n",
-		   orig_node->orig, client);
+		   "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
+		   orig_node->orig, client, BATADV_PRINT_VID(vid));
 
 	batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
 
 	memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
-	tvlv_roam.reserved = 0;
+	tvlv_roam.vid = htons(vid);
 
 	batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
 				 orig_node->orig, BATADV_TVLV_ROAM, 1,
@@ -2263,19 +2871,25 @@ void batadv_tt_free(struct batadv_priv *bat_priv)
 	kfree(bat_priv->tt.last_changeset);
 }
 
-/* This function will enable or disable the specified flags for all the entries
- * in the given hash table and returns the number of modified entries
+/**
+ * batadv_tt_local_set_flags - set or unset the specified flags on the local
+ *  table and possibly count them in the TT size
+ * @bat_priv: the bat priv with all the soft interface information
+ * @flags: the flag to switch
+ * @enable: whether to set or unset the flag
+ * @count: whether to increase the TT size by the number of changed entries
  */
-static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash,
-				    uint16_t flags, bool enable)
+static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv,
+				      uint16_t flags, bool enable, bool count)
 {
-	uint32_t i;
+	struct batadv_hashtable *hash = bat_priv->tt.local_hash;
+	struct batadv_tt_common_entry *tt_common_entry;
 	uint16_t changed_num = 0;
 	struct hlist_head *head;
-	struct batadv_tt_common_entry *tt_common_entry;
+	uint32_t i;
 
 	if (!hash)
-		goto out;
+		return;
 
 	for (i = 0; i < hash->size; i++) {
 		head = &hash->table[i];
@@ -2293,11 +2907,15 @@ static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash,
 				tt_common_entry->flags &= ~flags;
 			}
 			changed_num++;
+
+			if (!count)
+				continue;
+
+			batadv_tt_local_size_inc(bat_priv,
+						 tt_common_entry->vid);
 		}
 		rcu_read_unlock();
 	}
-out:
-	return changed_num;
 }
 
 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
@@ -2325,10 +2943,11 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
 				continue;
 
 			batadv_dbg(BATADV_DBG_TT, bat_priv,
-				   "Deleting local tt entry (%pM): pending\n",
-				   tt_common->addr);
+				   "Deleting local tt entry (%pM, vid: %d): pending\n",
+				   tt_common->addr,
+				   BATADV_PRINT_VID(tt_common->vid));
 
-			atomic_dec(&bat_priv->tt.local_entry_num);
+			batadv_tt_local_size_dec(bat_priv, tt_common->vid);
 			hlist_del_rcu(&tt_common->hash_entry);
 			tt_local = container_of(tt_common,
 						struct batadv_tt_local_entry,
@@ -2346,21 +2965,18 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
  */
 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
 {
-	uint16_t changed_num = 0;
+	spin_lock_bh(&bat_priv->tt.commit_lock);
 
 	if (atomic_read(&bat_priv->tt.local_changes) < 1) {
 		if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
 			batadv_tt_tvlv_container_update(bat_priv);
-		return;
+		goto out;
 	}
 
-	changed_num = batadv_tt_set_flags(bat_priv->tt.local_hash,
-					  BATADV_TT_CLIENT_NEW, false);
+	batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
 
-	/* all reset entries have to be counted as local entries */
-	atomic_add(changed_num, &bat_priv->tt.local_entry_num);
 	batadv_tt_local_purge_pending_clients(bat_priv);
-	bat_priv->tt.local_crc = batadv_tt_local_crc(bat_priv);
+	batadv_tt_local_update_crc(bat_priv);
 
 	/* Increment the TTVN only once per OGM interval */
 	atomic_inc(&bat_priv->tt.vn);
@@ -2371,23 +2987,28 @@ void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
 	/* reset the sending counter */
 	atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
 	batadv_tt_tvlv_container_update(bat_priv);
+
+out:
+	spin_unlock_bh(&bat_priv->tt.commit_lock);
 }
 
 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
-			   uint8_t *dst)
+			   uint8_t *dst, unsigned short vid)
 {
 	struct batadv_tt_local_entry *tt_local_entry = NULL;
 	struct batadv_tt_global_entry *tt_global_entry = NULL;
+	struct batadv_softif_vlan *vlan;
 	bool ret = false;
 
-	if (!atomic_read(&bat_priv->ap_isolation))
+	vlan = batadv_softif_vlan_get(bat_priv, vid);
+	if (!vlan || !atomic_read(&vlan->ap_isolation))
 		goto out;
 
-	tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst);
+	tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
 	if (!tt_local_entry)
 		goto out;
 
-	tt_global_entry = batadv_tt_global_hash_find(bat_priv, src);
+	tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
 	if (!tt_global_entry)
 		goto out;
 
@@ -2397,6 +3018,8 @@ bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
 	ret = true;
 
 out:
+	if (vlan)
+		batadv_softif_vlan_free_ref(vlan);
 	if (tt_global_entry)
 		batadv_tt_global_entry_free_ref(tt_global_entry);
 	if (tt_local_entry)
@@ -2409,25 +3032,24 @@ out:
  *  information received via ogms
  * @bat_priv: the bat priv with all the soft interface information
  * @orig: the orig_node of the ogm
- * @tt_buff: buffer holding the tt information
+ * @tt_vlan: pointer to the first tvlv VLAN entry
+ * @tt_num_vlan: number of tvlv VLAN entries
+ * @tt_change: pointer to the first entry in the TT buffer
  * @tt_num_changes: number of tt changes inside the tt buffer
  * @ttvn: translation table version number of this changeset
  * @tt_crc: crc32 checksum of orig node's translation table
  */
 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
 				  struct batadv_orig_node *orig_node,
-				  const unsigned char *tt_buff,
-				  uint16_t tt_num_changes, uint8_t ttvn,
-				  uint32_t tt_crc)
+				  const void *tt_buff, uint16_t tt_num_vlan,
+				  struct batadv_tvlv_tt_change *tt_change,
+				  uint16_t tt_num_changes, uint8_t ttvn)
 {
 	uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
+	struct batadv_tvlv_tt_vlan_data *tt_vlan;
 	bool full_table = true;
-	struct batadv_tvlv_tt_change *tt_change;
-
-	/* don't care about a backbone gateways updates. */
-	if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
-		return;
 
+	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
 	/* orig table not initialised AND first diff is in the OGM OR the ttvn
 	 * increased by one -> we can apply the attached changes
 	 */
@@ -2443,6 +3065,8 @@ static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
 			goto request_table;
 		}
 
+		spin_lock_bh(&orig_node->tt_lock);
+
 		tt_change = (struct batadv_tvlv_tt_change *)tt_buff;
 		batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
 					 ttvn, tt_change);
@@ -2451,7 +3075,9 @@ static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
 		 * prefer to recompute it to spot any possible inconsistency
 		 * in the global table
 		 */
-		orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node);
+		batadv_tt_global_update_crc(bat_priv, orig_node);
+
+		spin_unlock_bh(&orig_node->tt_lock);
 
 		/* The ttvn alone is not enough to guarantee consistency
 		 * because a single value could represent different states
@@ -2462,37 +3088,46 @@ static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
 		 * checking the CRC value is mandatory to detect the
 		 * inconsistency
 		 */
-		if (orig_node->tt_crc != tt_crc)
+		if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
+						tt_num_vlan))
 			goto request_table;
 	} else {
 		/* if we missed more than one change or our tables are not
 		 * in sync anymore -> request fresh tt data
 		 */
 		if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
-		    orig_node->tt_crc != tt_crc) {
+		    !batadv_tt_global_check_crc(orig_node, tt_vlan,
+						tt_num_vlan)) {
 request_table:
 			batadv_dbg(BATADV_DBG_TT, bat_priv,
-				   "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %#.8x last_crc: %#.8x num_changes: %u)\n",
-				   orig_node->orig, ttvn, orig_ttvn, tt_crc,
-				   orig_node->tt_crc, tt_num_changes);
+				   "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
+				   orig_node->orig, ttvn, orig_ttvn,
+				   tt_num_changes);
 			batadv_send_tt_request(bat_priv, orig_node, ttvn,
-					       tt_crc, full_table);
+					       tt_vlan, tt_num_vlan,
+					       full_table);
 			return;
 		}
 	}
 }
 
-/* returns true whether we know that the client has moved from its old
- * originator to another one. This entry is kept is still kept for consistency
- * purposes
+/**
+ * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
+ * @bat_priv: the bat priv with all the soft interface information
+ * @addr: the mac address of the client to check
+ * @vid: VLAN identifier
+ *
+ * Returns true if we know that the client has moved from its old originator
+ * to another one. This entry is still kept for consistency purposes and will be
+ * deleted later by a DEL or because of timeout
  */
 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
-					uint8_t *addr)
+					uint8_t *addr, unsigned short vid)
 {
 	struct batadv_tt_global_entry *tt_global_entry;
 	bool ret = false;
 
-	tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
+	tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
 	if (!tt_global_entry)
 		goto out;
 
@@ -2505,19 +3140,20 @@ out:
 /**
  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
  * @bat_priv: the bat priv with all the soft interface information
- * @addr: the MAC address of the local client to query
+ * @addr: the mac address of the local client to query
+ * @vid: VLAN identifier
  *
  * Returns true if the local client is known to be roaming (it is not served by
  * this node anymore) or not. If yes, the client is still present in the table
  * to keep the latter consistent with the node TTVN
  */
 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
-				       uint8_t *addr)
+				       uint8_t *addr, unsigned short vid)
 {
 	struct batadv_tt_local_entry *tt_local_entry;
 	bool ret = false;
 
-	tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
+	tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
 	if (!tt_local_entry)
 		goto out;
 
@@ -2529,25 +3165,19 @@ out:
 
 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
 					  struct batadv_orig_node *orig_node,
-					  const unsigned char *addr)
+					  const unsigned char *addr,
+					  unsigned short vid)
 {
 	bool ret = false;
 
-	/* if the originator is a backbone node (meaning it belongs to the same
-	 * LAN of this node) the temporary client must not be added because to
-	 * reach such destination the node must use the LAN instead of the mesh
-	 */
-	if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
-		goto out;
-
-	if (!batadv_tt_global_add(bat_priv, orig_node, addr,
+	if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
 				  BATADV_TT_CLIENT_TEMP,
 				  atomic_read(&orig_node->last_ttvn)))
 		goto out;
 
 	batadv_dbg(BATADV_DBG_TT, bat_priv,
-		   "Added temporary global client (addr: %pM orig: %pM)\n",
-		   addr, orig_node->orig);
+		   "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
+		   addr, BATADV_PRINT_VID(vid), orig_node->orig);
 	ret = true;
 out:
 	return ret;
@@ -2563,12 +3193,13 @@ out:
  */
 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
 					  struct batadv_orig_node *orig,
-					  uint8_t flags,
-					  void *tvlv_value,
+					  uint8_t flags, void *tvlv_value,
 					  uint16_t tvlv_value_len)
 {
+	struct batadv_tvlv_tt_vlan_data *tt_vlan;
+	struct batadv_tvlv_tt_change *tt_change;
 	struct batadv_tvlv_tt_data *tt_data;
-	uint16_t num_entries;
+	uint16_t num_entries, num_vlan;
 
 	if (tvlv_value_len < sizeof(*tt_data))
 		return;
@@ -2576,11 +3207,19 @@ static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
 	tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
 	tvlv_value_len -= sizeof(*tt_data);
 
+	num_vlan = ntohs(tt_data->num_vlan);
+
+	if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
+		return;
+
+	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
+	tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
+	tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
+
 	num_entries = batadv_tt_entries(tvlv_value_len);
 
-	batadv_tt_update_orig(bat_priv, orig,
-			      (unsigned char *)(tt_data + 1),
-			      num_entries, tt_data->ttvn, ntohl(tt_data->crc));
+	batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
+			      num_entries, tt_data->ttvn);
 }
 
 /**
@@ -2601,7 +3240,7 @@ static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
 					     uint16_t tvlv_value_len)
 {
 	struct batadv_tvlv_tt_data *tt_data;
-	uint16_t num_entries;
+	uint16_t tt_vlan_len, tt_num_entries;
 	char tt_flag;
 	bool ret;
 
@@ -2611,7 +3250,14 @@ static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
 	tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
 	tvlv_value_len -= sizeof(*tt_data);
 
-	num_entries = batadv_tt_entries(tvlv_value_len);
+	tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
+	tt_vlan_len *= ntohs(tt_data->num_vlan);
+
+	if (tvlv_value_len < tt_vlan_len)
+		return NET_RX_SUCCESS;
+
+	tvlv_value_len -= tt_vlan_len;
+	tt_num_entries = batadv_tt_entries(tvlv_value_len);
 
 	switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
 	case BATADV_TT_REQUEST:
@@ -2639,7 +3285,7 @@ static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
 
 		if (batadv_is_my_mac(bat_priv, dst)) {
 			batadv_handle_tt_response(bat_priv, tt_data,
-						  src, num_entries);
+						  src, tt_num_entries);
 			return NET_RX_SUCCESS;
 		}
 
@@ -2684,13 +3330,6 @@ static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
 	if (!batadv_is_my_mac(bat_priv, dst))
 		return NET_RX_DROP;
 
-	/* 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 (batadv_bla_is_backbone_gw_orig(bat_priv, src))
-		goto out;
-
 	if (tvlv_value_len < sizeof(*roaming_adv))
 		goto out;
 
@@ -2706,7 +3345,7 @@ static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
 		   src, roaming_adv->client);
 
 	batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
-			     BATADV_TT_CLIENT_ROAM,
+			     ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
 			     atomic_read(&orig_node->last_ttvn) + 1);
 
 out: