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Commit 702ed3c1 authored by David S. Miller's avatar David S. Miller
Browse files

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



Included changes:
- hash computation improvements
- Bridge Loop Avoidance set-up phase optimisations
- Roaming handling code redesign
- some code cleanups

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 1a39a65c 170173bf

net/batman-adv/bridge_loop_avoidance.c

+41 −18
Original line number Diff line number Diff line
@@ -40,15 +40,11 @@ static void batadv_bla_send_announce(struct batadv_priv *bat_priv, 
/* return the index of the claim */

static inline uint32_t batadv_choose_claim(const void *data, uint32_t size)

{

	const unsigned char *key = data;

	struct batadv_claim *claim = (struct batadv_claim *)data;

	uint32_t hash = 0;

	size_t i;



	for (i = 0; i < ETH_ALEN + sizeof(short); i++) {

		hash += key[i];

		hash += (hash << 10);

		hash ^= (hash >> 6);

	}

	hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));

	hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));



	hash += (hash << 3);

	hash ^= (hash >> 11);
@@ -61,15 +57,11 @@ static inline uint32_t batadv_choose_claim(const void *data, uint32_t size) 
static inline uint32_t batadv_choose_backbone_gw(const void *data,

						 uint32_t size)

{

	const unsigned char *key = data;

	struct batadv_claim *claim = (struct batadv_claim *)data;

	uint32_t hash = 0;

	size_t i;



	for (i = 0; i < ETH_ALEN + sizeof(short); i++) {

		hash += key[i];

		hash += (hash << 10);

		hash ^= (hash >> 6);

	}

	hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));

	hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));



	hash += (hash << 3);

	hash ^= (hash >> 11);
@@ -362,7 +354,7 @@ out: 
 */

static struct batadv_backbone_gw *

batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,

			   short vid)

			   short vid, bool own_backbone)

{

	struct batadv_backbone_gw *entry;

	struct batadv_orig_node *orig_node;
@@ -386,6 +378,7 @@ batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, 
	entry->crc = BATADV_BLA_CRC_INIT;

	entry->bat_priv = bat_priv;

	atomic_set(&entry->request_sent, 0);

	atomic_set(&entry->wait_periods, 0);

	memcpy(entry->orig, orig, ETH_ALEN);



	/* one for the hash, one for returning */
@@ -409,6 +402,16 @@ batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig, 
					  "became a backbone gateway");

		batadv_orig_node_free_ref(orig_node);

	}



	if (own_backbone) {

		batadv_bla_send_announce(bat_priv, entry);



		/* this will be decreased in the worker thread */

		atomic_inc(&entry->request_sent);

		atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);

		atomic_inc(&bat_priv->bla.num_requests);

	}



	return entry;

}
@@ -424,7 +427,7 @@ batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, 


	backbone_gw = batadv_bla_get_backbone_gw(bat_priv,

						 primary_if->net_dev->dev_addr,

						 vid);

						 vid, true);

	if (unlikely(!backbone_gw))

		return;
@@ -632,7 +635,8 @@ static int batadv_handle_announce(struct batadv_priv *bat_priv, 
	if (memcmp(an_addr, batadv_announce_mac, 4) != 0)

		return 0;



	backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid);

	backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,

						 false);



	if (unlikely(!backbone_gw))

		return 1;
@@ -730,7 +734,8 @@ static int batadv_handle_claim(struct batadv_priv *bat_priv, 


	/* register the gateway if not yet available, and add the claim. */



	backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid);

	backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,

						 false);



	if (unlikely(!backbone_gw))

		return 1;
@@ -1140,6 +1145,24 @@ static void batadv_bla_periodic_work(struct work_struct *work) 
			backbone_gw->lasttime = jiffies;



			batadv_bla_send_announce(bat_priv, backbone_gw);



			/* request_sent is only set after creation to avoid

			 * problems when we are not yet known as backbone gw

			 * in the backbone.

			 *

			 * We can reset this now after we waited some periods

			 * to give bridge forward delays and bla group forming

			 * some grace time.

			 */



			if (atomic_read(&backbone_gw->request_sent) == 0)

				continue;



			if (!atomic_dec_and_test(&backbone_gw->wait_periods))

				continue;



			atomic_dec(&backbone_gw->bat_priv->bla.num_requests);

			atomic_set(&backbone_gw->request_sent, 0);

		}

		rcu_read_unlock();

	}

net/batman-adv/hard-interface.c

+40 −1
Original line number Diff line number Diff line
@@ -59,6 +59,45 @@ out: 
	return hard_iface;

}



/**

 * batadv_is_on_batman_iface - check if a device is a batman iface descendant

 * @net_dev: the device to check

 *

 * If the user creates any virtual device on top of a batman-adv interface, it

 * is important to prevent this new interface to be used to create a new mesh

 * network (this behaviour would lead to a batman-over-batman configuration).

 * This function recursively checks all the fathers of the device passed as

 * argument looking for a batman-adv soft interface.

 *

 * Returns true if the device is descendant of a batman-adv mesh interface (or

 * if it is a batman-adv interface itself), false otherwise

 */

static bool batadv_is_on_batman_iface(const struct net_device *net_dev)

{

	struct net_device *parent_dev;

	bool ret;



	/* check if this is a batman-adv mesh interface */

	if (batadv_softif_is_valid(net_dev))

		return true;



	/* no more parents..stop recursion */

	if (net_dev->iflink == net_dev->ifindex)

		return false;



	/* recurse over the parent device */

	parent_dev = dev_get_by_index(&init_net, net_dev->iflink);

	/* if we got a NULL parent_dev there is something broken.. */

	if (WARN(!parent_dev, "Cannot find parent device"))

		return false;



	ret = batadv_is_on_batman_iface(parent_dev);



	if (parent_dev)

		dev_put(parent_dev);

	return ret;

}



static int batadv_is_valid_iface(const struct net_device *net_dev)

{

	if (net_dev->flags & IFF_LOOPBACK)
@@ -71,7 +110,7 @@ static int batadv_is_valid_iface(const struct net_device *net_dev) 
		return 0;



	/* no batman over batman */

	if (batadv_softif_is_valid(net_dev))

	if (batadv_is_on_batman_iface(net_dev))

		return 0;



	return 1;

net/batman-adv/hash.h

+22 −0
Original line number Diff line number Diff line
@@ -81,6 +81,28 @@ static inline void batadv_hash_delete(struct batadv_hashtable *hash, 
	batadv_hash_destroy(hash);

}



/**

 *	batadv_hash_bytes - hash some bytes and add them to the previous hash

 *	@hash: previous hash value

 *	@data: data to be hashed

 *	@size: number of bytes to be hashed

 *

 *	Returns the new hash value.

 */

static inline uint32_t batadv_hash_bytes(uint32_t hash, void *data,

					 uint32_t size)

{

	const unsigned char *key = data;

	int i;



	for (i = 0; i < size; i++) {

		hash += key[i];

		hash += (hash << 10);

		hash ^= (hash >> 6);

	}

	return hash;

}



/**

 *	batadv_hash_add - adds data to the hashtable

 *	@hash: storage hash table

net/batman-adv/main.h

+1 −0
Original line number Diff line number Diff line
@@ -95,6 +95,7 @@ 
#define BATADV_BLA_PERIOD_LENGTH	10000	/* 10 seconds */

#define BATADV_BLA_BACKBONE_TIMEOUT	(BATADV_BLA_PERIOD_LENGTH * 3)

#define BATADV_BLA_CLAIM_TIMEOUT	(BATADV_BLA_PERIOD_LENGTH * 10)

#define BATADV_BLA_WAIT_PERIODS		3



#define BATADV_DUPLIST_SIZE		16

#define BATADV_DUPLIST_TIMEOUT		500	/* 500 ms */

net/batman-adv/originator.c

+0 −1
Original line number Diff line number Diff line
@@ -221,7 +221,6 @@ struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv, 
	atomic_set(&orig_node->refcount, 2);



	orig_node->tt_initialised = false;

	orig_node->tt_poss_change = false;

	orig_node->bat_priv = bat_priv;

	memcpy(orig_node->orig, addr, ETH_ALEN);

	batadv_dat_init_orig_node_addr(orig_node);