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Commit 5d2c05b2 authored by Antonio Quartulli's avatar Antonio Quartulli Committed by Antonio Quartulli
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batman-adv: add per VLAN interface attribute framework 



Since batman-adv is now fully VLAN-aware, a proper framework
able to handle per-vlan-interface attributes is needed.

Those attributes will affect the associated VLAN interface
only, rather than the real soft_iface (which would result
in every vlan interface having the same attribute
configuration).

To make the code simpler and easier to extend, attributes
associated to the standalone soft_iface are now treated
like belonging to yet another vlan having a special vid.
This vid is different from the others because it is made up
by all zeros and the VLAN_HAS_TAG bit is not set.

Signed-off-by: default avatarAntonio Quartulli <antonio@open-mesh.com>
Signed-off-by: default avatarMarek Lindner <lindner_marek@yahoo.de>
parent be1db4f6

net/batman-adv/hard-interface.c

+2 −0
Original line number Diff line number Diff line
@@ -643,6 +643,8 @@ static int batadv_hard_if_event(struct notifier_block *this, 


	if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {

		batadv_sysfs_add_meshif(net_dev);

		bat_priv = netdev_priv(net_dev);

		batadv_softif_create_vlan(bat_priv, BATADV_NO_FLAGS);

		return NOTIFY_DONE;

	}

net/batman-adv/main.c

+2 −3
Original line number Diff line number Diff line
@@ -113,6 +113,7 @@ int batadv_mesh_init(struct net_device *soft_iface) 
	spin_lock_init(&bat_priv->gw.list_lock);

	spin_lock_init(&bat_priv->tvlv.container_list_lock);

	spin_lock_init(&bat_priv->tvlv.handler_list_lock);

	spin_lock_init(&bat_priv->softif_vlan_list_lock);



	INIT_HLIST_HEAD(&bat_priv->forw_bat_list);

	INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
@@ -122,6 +123,7 @@ int batadv_mesh_init(struct net_device *soft_iface) 
	INIT_LIST_HEAD(&bat_priv->tt.roam_list);

	INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);

	INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);

	INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);



	ret = batadv_originator_init(bat_priv);

	if (ret < 0)
@@ -131,9 +133,6 @@ int batadv_mesh_init(struct net_device *soft_iface) 
	if (ret < 0)

		goto err;



	batadv_tt_local_add(soft_iface, soft_iface->dev_addr,

			    BATADV_NO_FLAGS, BATADV_NULL_IFINDEX);



	ret = batadv_bla_init(bat_priv);

	if (ret < 0)

		goto err;

net/batman-adv/soft-interface.c

+171 −0
Original line number Diff line number Diff line
@@ -393,6 +393,166 @@ void batadv_interface_rx(struct net_device *soft_iface, 
	return;

}



/**

 * batadv_softif_vlan_free_ref - decrease the vlan object refcounter and

 *  possibly free it

 * @softif_vlan: the vlan object to release

 */

static void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *softif_vlan)

{

	if (atomic_dec_and_test(&softif_vlan->refcount))

		kfree_rcu(softif_vlan, rcu);

}



/**

 * batadv_softif_vlan_get - get the vlan object for a specific vid

 * @bat_priv: the bat priv with all the soft interface information

 * @vid: the identifier of the vlan object to retrieve

 *

 * Returns the private data of the vlan matching the vid passed as argument or

 * NULL otherwise. The refcounter of the returned object is incremented by 1.

 */

static struct batadv_softif_vlan *

batadv_softif_vlan_get(struct batadv_priv *bat_priv, unsigned short vid)

{

	struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;



	rcu_read_lock();

	hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {

		if (vlan_tmp->vid != vid)

			continue;



		if (!atomic_inc_not_zero(&vlan_tmp->refcount))

			continue;



		vlan = vlan_tmp;

		break;

	}

	rcu_read_unlock();



	return vlan;

}



/**

 * batadv_create_vlan - allocate the needed resources for a new vlan

 * @bat_priv: the bat priv with all the soft interface information

 * @vid: the VLAN identifier

 *

 * Returns 0 on success, a negative error otherwise.

 */

int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid)

{

	struct batadv_softif_vlan *vlan;



	vlan = batadv_softif_vlan_get(bat_priv, vid);

	if (vlan) {

		batadv_softif_vlan_free_ref(vlan);

		return -EEXIST;

	}



	vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);

	if (!vlan)

		return -ENOMEM;



	vlan->vid = vid;

	atomic_set(&vlan->refcount, 1);



	/* add a new TT local entry. This one will be marked with the NOPURGE

	 * flag

	 */

	batadv_tt_local_add(bat_priv->soft_iface,

			    bat_priv->soft_iface->dev_addr, vid,

			    BATADV_NULL_IFINDEX);



	spin_lock_bh(&bat_priv->softif_vlan_list_lock);

	hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list);

	spin_unlock_bh(&bat_priv->softif_vlan_list_lock);



	return 0;

}



/**

 * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object

 * @bat_priv: the bat priv with all the soft interface information

 * @vlan: the object to remove

 */

static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv,

				       struct batadv_softif_vlan *vlan)

{

	spin_lock_bh(&bat_priv->softif_vlan_list_lock);

	hlist_del_rcu(&vlan->list);

	spin_unlock_bh(&bat_priv->softif_vlan_list_lock);



	/* explicitly remove the associated TT local entry because it is marked

	 * with the NOPURGE flag

	 */

	batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr,

			       vlan->vid, "vlan interface destroyed", false);



	batadv_softif_vlan_free_ref(vlan);

}



/**

 * batadv_interface_add_vid - ndo_add_vid API implementation

 * @dev: the netdev of the mesh interface

 * @vid: identifier of the new vlan

 *

 * Set up all the internal structures for handling the new vlan on top of the

 * mesh interface

 *

 * Returns 0 on success or a negative error code in case of failure.

 */

static int batadv_interface_add_vid(struct net_device *dev, __be16 proto,

				    unsigned short vid)

{

	struct batadv_priv *bat_priv = netdev_priv(dev);



	/* only 802.1Q vlans are supported.

	 * batman-adv does not know how to handle other types

	 */

	if (proto != htons(ETH_P_8021Q))

		return -EINVAL;



	vid |= BATADV_VLAN_HAS_TAG;



	return batadv_softif_create_vlan(bat_priv, vid);

}



/**

 * batadv_interface_kill_vid - ndo_kill_vid API implementation

 * @dev: the netdev of the mesh interface

 * @vid: identifier of the deleted vlan

 *

 * Destroy all the internal structures used to handle the vlan identified by vid

 * on top of the mesh interface

 *

 * Returns 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q

 * or -ENOENT if the specified vlan id wasn't registered.

 */

static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,

				     unsigned short vid)

{

	struct batadv_priv *bat_priv = netdev_priv(dev);

	struct batadv_softif_vlan *vlan;



	/* only 802.1Q vlans are supported. batman-adv does not know how to

	 * handle other types

	 */

	if (proto != htons(ETH_P_8021Q))

		return -EINVAL;



	vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG);

	if (!vlan)

		return -ENOENT;



	batadv_softif_destroy_vlan(bat_priv, vlan);



	/* finally free the vlan object */

	batadv_softif_vlan_free_ref(vlan);



	return 0;

}



/* batman-adv network devices have devices nesting below it and are a special

 * "super class" of normal network devices; split their locks off into a

 * separate class since they always nest.
@@ -432,6 +592,7 @@ static void batadv_set_lockdep_class(struct net_device *dev) 
 */

static void batadv_softif_destroy_finish(struct work_struct *work)

{

	struct batadv_softif_vlan *vlan;

	struct batadv_priv *bat_priv;

	struct net_device *soft_iface;
@@ -439,6 +600,13 @@ static void batadv_softif_destroy_finish(struct work_struct *work) 
				cleanup_work);

	soft_iface = bat_priv->soft_iface;



	/* destroy the "untagged" VLAN */

	vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS);

	if (vlan) {

		batadv_softif_destroy_vlan(bat_priv, vlan);

		batadv_softif_vlan_free_ref(vlan);

	}



	batadv_sysfs_del_meshif(soft_iface);



	rtnl_lock();
@@ -594,6 +762,8 @@ static const struct net_device_ops batadv_netdev_ops = { 
	.ndo_open = batadv_interface_open,

	.ndo_stop = batadv_interface_release,

	.ndo_get_stats = batadv_interface_stats,

	.ndo_vlan_rx_add_vid = batadv_interface_add_vid,

	.ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,

	.ndo_set_mac_address = batadv_interface_set_mac_addr,

	.ndo_change_mtu = batadv_interface_change_mtu,

	.ndo_set_rx_mode = batadv_interface_set_rx_mode,
@@ -633,6 +803,7 @@ static void batadv_softif_init_early(struct net_device *dev) 


	dev->netdev_ops = &batadv_netdev_ops;

	dev->destructor = batadv_softif_free;

	dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;

	dev->tx_queue_len = 0;



	/* can't call min_mtu, because the needed variables

net/batman-adv/soft-interface.h

+1 −0
Original line number Diff line number Diff line
@@ -28,5 +28,6 @@ struct net_device *batadv_softif_create(const char *name); 
void batadv_softif_destroy_sysfs(struct net_device *soft_iface);

int batadv_softif_is_valid(const struct net_device *net_dev);

extern struct rtnl_link_ops batadv_link_ops;

int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid);



#endif /* _NET_BATMAN_ADV_SOFT_INTERFACE_H_ */

net/batman-adv/types.h

+21 −0
Original line number Diff line number Diff line
@@ -530,6 +530,22 @@ struct batadv_priv_nc { 
	struct batadv_hashtable *decoding_hash;

};



/**

 * struct batadv_softif_vlan - per VLAN attributes set

 * @vid: VLAN identifier

 * @kobj: kobject for sysfs vlan subdirectory

 * @list: list node for bat_priv::softif_vlan_list

 * @refcount: number of context where this object is currently in use

 * @rcu: struct used for freeing in a RCU-safe manner

 */

struct batadv_softif_vlan {

	unsigned short vid;

	struct kobject *kobj;

	struct hlist_node list;

	atomic_t refcount;

	struct rcu_head rcu;

};



/**

 * struct batadv_priv - per mesh interface data

 * @mesh_state: current status of the mesh (inactive/active/deactivating)
@@ -566,6 +582,9 @@ struct batadv_priv_nc { 
 * @primary_if: one of the hard interfaces assigned to this mesh interface

 *  becomes the primary interface

 * @bat_algo_ops: routing algorithm used by this mesh interface

 * @softif_vlan_list: a list of softif_vlan structs, one per VLAN created on top

 *  of the mesh interface represented by this object

 * @softif_vlan_list_lock: lock protecting softif_vlan_list

 * @bla: bridge loope avoidance data

 * @debug_log: holding debug logging relevant data

 * @gw: gateway data
@@ -613,6 +632,8 @@ struct batadv_priv { 
	struct work_struct cleanup_work;

	struct batadv_hard_iface __rcu *primary_if;  /* rcu protected pointer */

	struct batadv_algo_ops *bat_algo_ops;

	struct hlist_head softif_vlan_list;

	spinlock_t softif_vlan_list_lock; /* protects softif_vlan_list */

#ifdef CONFIG_BATMAN_ADV_BLA

	struct batadv_priv_bla bla;

#endif