![Antonio Quartulli](/assets/img/avatar_default.png)
Some operations executed on an orig_node depends on the current routing algorithm being used. To easily make this mechanism routing algorithm agnostic add a orig_node specific API that each algorithm can populate with its own routines. Such routines are then invoked by the code when needed, without knowing which routing algorithm is currently in use With this patch 3 API functions are added: - orig_free (to free routing depending internal structs) - orig_add_if (to change the inner state of an orig_node when a new hard interface is added) - orig_del_if (to change the inner state of an orig_node when an hard interface is removed) Signed-off-by: Antonio Quartulli <antonio@open-mesh.com> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
633 lines
17 KiB
C
633 lines
17 KiB
C
/* Copyright (C) 2009-2013 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#include "main.h"
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#include "distributed-arp-table.h"
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#include "originator.h"
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#include "hash.h"
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#include "translation-table.h"
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#include "routing.h"
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#include "gateway_client.h"
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#include "hard-interface.h"
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#include "soft-interface.h"
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#include "bridge_loop_avoidance.h"
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#include "network-coding.h"
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#include "fragmentation.h"
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/* hash class keys */
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static struct lock_class_key batadv_orig_hash_lock_class_key;
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static void batadv_purge_orig(struct work_struct *work);
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/* returns 1 if they are the same originator */
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int batadv_compare_orig(const struct hlist_node *node, const void *data2)
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{
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const void *data1 = container_of(node, struct batadv_orig_node,
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hash_entry);
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return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
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}
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/**
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* batadv_orig_node_vlan_get - get an orig_node_vlan object
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* @orig_node: the originator serving the VLAN
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* @vid: the VLAN identifier
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*
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* Returns the vlan object identified by vid and belonging to orig_node or NULL
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* if it does not exist.
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*/
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struct batadv_orig_node_vlan *
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batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
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unsigned short vid)
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{
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struct batadv_orig_node_vlan *vlan = NULL, *tmp;
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rcu_read_lock();
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list_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) {
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if (tmp->vid != vid)
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continue;
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if (!atomic_inc_not_zero(&tmp->refcount))
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continue;
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vlan = tmp;
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break;
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}
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rcu_read_unlock();
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return vlan;
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}
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/**
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* batadv_orig_node_vlan_new - search and possibly create an orig_node_vlan
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* object
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* @orig_node: the originator serving the VLAN
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* @vid: the VLAN identifier
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*
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* Returns NULL in case of failure or the vlan object identified by vid and
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* belonging to orig_node otherwise. The object is created and added to the list
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* if it does not exist.
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*
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* The object is returned with refcounter increased by 1.
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*/
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struct batadv_orig_node_vlan *
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batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
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unsigned short vid)
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{
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struct batadv_orig_node_vlan *vlan;
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spin_lock_bh(&orig_node->vlan_list_lock);
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/* first look if an object for this vid already exists */
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vlan = batadv_orig_node_vlan_get(orig_node, vid);
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if (vlan)
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goto out;
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vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
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if (!vlan)
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goto out;
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atomic_set(&vlan->refcount, 2);
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vlan->vid = vid;
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list_add_rcu(&vlan->list, &orig_node->vlan_list);
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out:
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spin_unlock_bh(&orig_node->vlan_list_lock);
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return vlan;
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}
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/**
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* batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly free
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* the originator-vlan object
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* @orig_vlan: the originator-vlan object to release
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*/
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void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan)
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{
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if (atomic_dec_and_test(&orig_vlan->refcount))
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kfree_rcu(orig_vlan, rcu);
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}
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int batadv_originator_init(struct batadv_priv *bat_priv)
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{
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if (bat_priv->orig_hash)
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return 0;
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bat_priv->orig_hash = batadv_hash_new(1024);
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if (!bat_priv->orig_hash)
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goto err;
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batadv_hash_set_lock_class(bat_priv->orig_hash,
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&batadv_orig_hash_lock_class_key);
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INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig);
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queue_delayed_work(batadv_event_workqueue,
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&bat_priv->orig_work,
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msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
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return 0;
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err:
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return -ENOMEM;
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}
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void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node)
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{
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if (atomic_dec_and_test(&neigh_node->refcount))
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kfree_rcu(neigh_node, rcu);
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}
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/* increases the refcounter of a found router */
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struct batadv_neigh_node *
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batadv_orig_node_get_router(struct batadv_orig_node *orig_node)
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{
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struct batadv_neigh_node *router;
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rcu_read_lock();
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router = rcu_dereference(orig_node->router);
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if (router && !atomic_inc_not_zero(&router->refcount))
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router = NULL;
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rcu_read_unlock();
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return router;
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}
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/**
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* batadv_neigh_node_new - create and init a new neigh_node object
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* @hard_iface: the interface where the neighbour is connected to
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* @neigh_addr: the mac address of the neighbour interface
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* @orig_node: originator object representing the neighbour
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*
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* Allocates a new neigh_node object and initialises all the generic fields.
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* Returns the new object or NULL on failure.
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*/
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struct batadv_neigh_node *
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batadv_neigh_node_new(struct batadv_hard_iface *hard_iface,
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const uint8_t *neigh_addr,
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struct batadv_orig_node *orig_node)
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{
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struct batadv_neigh_node *neigh_node;
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neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
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if (!neigh_node)
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goto out;
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INIT_HLIST_NODE(&neigh_node->list);
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memcpy(neigh_node->addr, neigh_addr, ETH_ALEN);
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neigh_node->if_incoming = hard_iface;
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neigh_node->orig_node = orig_node;
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INIT_LIST_HEAD(&neigh_node->bonding_list);
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/* extra reference for return */
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atomic_set(&neigh_node->refcount, 2);
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out:
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return neigh_node;
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}
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static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
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{
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struct hlist_node *node_tmp;
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struct batadv_neigh_node *neigh_node, *tmp_neigh_node;
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struct batadv_orig_node *orig_node;
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orig_node = container_of(rcu, struct batadv_orig_node, rcu);
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spin_lock_bh(&orig_node->neigh_list_lock);
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/* for all bonding members ... */
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list_for_each_entry_safe(neigh_node, tmp_neigh_node,
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&orig_node->bond_list, bonding_list) {
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list_del_rcu(&neigh_node->bonding_list);
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batadv_neigh_node_free_ref(neigh_node);
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}
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/* for all neighbors towards this originator ... */
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hlist_for_each_entry_safe(neigh_node, node_tmp,
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&orig_node->neigh_list, list) {
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hlist_del_rcu(&neigh_node->list);
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batadv_neigh_node_free_ref(neigh_node);
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}
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spin_unlock_bh(&orig_node->neigh_list_lock);
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/* Free nc_nodes */
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batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
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batadv_frag_purge_orig(orig_node, NULL);
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batadv_tt_global_del_orig(orig_node->bat_priv, orig_node, -1,
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"originator timed out");
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if (orig_node->bat_priv->bat_algo_ops->bat_orig_free)
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orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node);
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kfree(orig_node->tt_buff);
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kfree(orig_node);
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}
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/**
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* batadv_orig_node_free_ref - decrement the orig node refcounter and possibly
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* schedule an rcu callback for freeing it
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* @orig_node: the orig node to free
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*/
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void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
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{
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if (atomic_dec_and_test(&orig_node->refcount))
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call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
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}
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/**
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* batadv_orig_node_free_ref_now - decrement the orig node refcounter and
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* possibly free it (without rcu callback)
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* @orig_node: the orig node to free
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*/
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void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
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{
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if (atomic_dec_and_test(&orig_node->refcount))
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batadv_orig_node_free_rcu(&orig_node->rcu);
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}
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void batadv_originator_free(struct batadv_priv *bat_priv)
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{
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struct batadv_hashtable *hash = bat_priv->orig_hash;
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struct hlist_node *node_tmp;
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struct hlist_head *head;
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spinlock_t *list_lock; /* spinlock to protect write access */
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struct batadv_orig_node *orig_node;
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uint32_t i;
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if (!hash)
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return;
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cancel_delayed_work_sync(&bat_priv->orig_work);
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bat_priv->orig_hash = NULL;
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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list_lock = &hash->list_locks[i];
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spin_lock_bh(list_lock);
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hlist_for_each_entry_safe(orig_node, node_tmp,
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head, hash_entry) {
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hlist_del_rcu(&orig_node->hash_entry);
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batadv_orig_node_free_ref(orig_node);
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}
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spin_unlock_bh(list_lock);
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}
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batadv_hash_destroy(hash);
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}
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/**
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* batadv_orig_node_new - creates a new orig_node
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* @bat_priv: the bat priv with all the soft interface information
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* @addr: the mac address of the originator
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*
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* Creates a new originator object and initialise all the generic fields.
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* The new object is not added to the originator list.
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* Returns the newly created object or NULL on failure.
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*/
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struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
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const uint8_t *addr)
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{
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struct batadv_orig_node *orig_node;
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struct batadv_orig_node_vlan *vlan;
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unsigned long reset_time;
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int i;
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"Creating new originator: %pM\n", addr);
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orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
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if (!orig_node)
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return NULL;
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INIT_HLIST_HEAD(&orig_node->neigh_list);
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INIT_LIST_HEAD(&orig_node->bond_list);
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INIT_LIST_HEAD(&orig_node->vlan_list);
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spin_lock_init(&orig_node->bcast_seqno_lock);
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spin_lock_init(&orig_node->neigh_list_lock);
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spin_lock_init(&orig_node->tt_buff_lock);
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spin_lock_init(&orig_node->tt_lock);
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spin_lock_init(&orig_node->vlan_list_lock);
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batadv_nc_init_orig(orig_node);
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/* extra reference for return */
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atomic_set(&orig_node->refcount, 2);
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orig_node->tt_initialised = false;
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orig_node->bat_priv = bat_priv;
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memcpy(orig_node->orig, addr, ETH_ALEN);
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batadv_dat_init_orig_node_addr(orig_node);
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orig_node->router = NULL;
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atomic_set(&orig_node->last_ttvn, 0);
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orig_node->tt_buff = NULL;
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orig_node->tt_buff_len = 0;
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reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
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orig_node->bcast_seqno_reset = reset_time;
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orig_node->batman_seqno_reset = reset_time;
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atomic_set(&orig_node->bond_candidates, 0);
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/* create a vlan object for the "untagged" LAN */
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vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
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if (!vlan)
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goto free_orig_node;
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/* batadv_orig_node_vlan_new() increases the refcounter.
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* Immediately release vlan since it is not needed anymore in this
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* context
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*/
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batadv_orig_node_vlan_free_ref(vlan);
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for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
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INIT_HLIST_HEAD(&orig_node->fragments[i].head);
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spin_lock_init(&orig_node->fragments[i].lock);
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orig_node->fragments[i].size = 0;
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}
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return orig_node;
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free_orig_node:
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kfree(orig_node);
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return NULL;
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}
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static bool
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batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
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struct batadv_orig_node *orig_node,
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struct batadv_neigh_node **best_neigh)
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{
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struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
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struct hlist_node *node_tmp;
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struct batadv_neigh_node *neigh_node;
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bool neigh_purged = false;
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unsigned long last_seen;
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struct batadv_hard_iface *if_incoming;
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*best_neigh = NULL;
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spin_lock_bh(&orig_node->neigh_list_lock);
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/* for all neighbors towards this originator ... */
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hlist_for_each_entry_safe(neigh_node, node_tmp,
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&orig_node->neigh_list, list) {
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last_seen = neigh_node->last_seen;
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if_incoming = neigh_node->if_incoming;
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if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
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(if_incoming->if_status == BATADV_IF_INACTIVE) ||
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(if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
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(if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
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if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
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(if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
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(if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
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orig_node->orig, neigh_node->addr,
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if_incoming->net_dev->name);
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else
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
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orig_node->orig, neigh_node->addr,
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jiffies_to_msecs(last_seen));
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neigh_purged = true;
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hlist_del_rcu(&neigh_node->list);
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batadv_bonding_candidate_del(orig_node, neigh_node);
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batadv_neigh_node_free_ref(neigh_node);
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} else {
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/* store the best_neighbour if this is the first
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* iteration or if a better neighbor has been found
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*/
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if (!*best_neigh ||
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bao->bat_neigh_cmp(neigh_node, *best_neigh) > 0)
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*best_neigh = neigh_node;
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}
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}
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spin_unlock_bh(&orig_node->neigh_list_lock);
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return neigh_purged;
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}
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static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
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struct batadv_orig_node *orig_node)
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{
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struct batadv_neigh_node *best_neigh_node;
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if (batadv_has_timed_out(orig_node->last_seen,
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2 * BATADV_PURGE_TIMEOUT)) {
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"Originator timeout: originator %pM, last_seen %u\n",
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orig_node->orig,
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jiffies_to_msecs(orig_node->last_seen));
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return true;
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} else {
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if (batadv_purge_orig_neighbors(bat_priv, orig_node,
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&best_neigh_node))
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batadv_update_route(bat_priv, orig_node,
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best_neigh_node);
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}
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return false;
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}
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static void _batadv_purge_orig(struct batadv_priv *bat_priv)
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{
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struct batadv_hashtable *hash = bat_priv->orig_hash;
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struct hlist_node *node_tmp;
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struct hlist_head *head;
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spinlock_t *list_lock; /* spinlock to protect write access */
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struct batadv_orig_node *orig_node;
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uint32_t i;
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if (!hash)
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return;
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/* for all origins... */
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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list_lock = &hash->list_locks[i];
|
|
|
|
spin_lock_bh(list_lock);
|
|
hlist_for_each_entry_safe(orig_node, node_tmp,
|
|
head, hash_entry) {
|
|
if (batadv_purge_orig_node(bat_priv, orig_node)) {
|
|
batadv_gw_node_delete(bat_priv, orig_node);
|
|
hlist_del_rcu(&orig_node->hash_entry);
|
|
batadv_orig_node_free_ref(orig_node);
|
|
continue;
|
|
}
|
|
|
|
batadv_frag_purge_orig(orig_node,
|
|
batadv_frag_check_entry);
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
|
|
batadv_gw_node_purge(bat_priv);
|
|
batadv_gw_election(bat_priv);
|
|
}
|
|
|
|
static void batadv_purge_orig(struct work_struct *work)
|
|
{
|
|
struct delayed_work *delayed_work;
|
|
struct batadv_priv *bat_priv;
|
|
|
|
delayed_work = container_of(work, struct delayed_work, work);
|
|
bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
|
|
_batadv_purge_orig(bat_priv);
|
|
queue_delayed_work(batadv_event_workqueue,
|
|
&bat_priv->orig_work,
|
|
msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
|
|
}
|
|
|
|
void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
|
|
{
|
|
_batadv_purge_orig(bat_priv);
|
|
}
|
|
|
|
int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
|
|
{
|
|
struct net_device *net_dev = (struct net_device *)seq->private;
|
|
struct batadv_priv *bat_priv = netdev_priv(net_dev);
|
|
struct batadv_hard_iface *primary_if;
|
|
|
|
primary_if = batadv_seq_print_text_primary_if_get(seq);
|
|
if (!primary_if)
|
|
return 0;
|
|
|
|
seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
|
|
BATADV_SOURCE_VERSION, primary_if->net_dev->name,
|
|
primary_if->net_dev->dev_addr, net_dev->name,
|
|
bat_priv->bat_algo_ops->name);
|
|
|
|
batadv_hardif_free_ref(primary_if);
|
|
|
|
if (!bat_priv->bat_algo_ops->bat_orig_print) {
|
|
seq_puts(seq,
|
|
"No printing function for this routing protocol\n");
|
|
return 0;
|
|
}
|
|
|
|
bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
|
|
int max_if_num)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
|
|
struct batadv_hashtable *hash = bat_priv->orig_hash;
|
|
struct hlist_head *head;
|
|
struct batadv_orig_node *orig_node;
|
|
uint32_t i;
|
|
int ret;
|
|
|
|
/* resize all orig nodes because orig_node->bcast_own(_sum) depend on
|
|
* if_num
|
|
*/
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
|
|
ret = 0;
|
|
if (bao->bat_orig_add_if)
|
|
ret = bao->bat_orig_add_if(orig_node,
|
|
max_if_num);
|
|
if (ret == -ENOMEM)
|
|
goto err;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
rcu_read_unlock();
|
|
return -ENOMEM;
|
|
}
|
|
|
|
int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
|
|
int max_if_num)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
struct batadv_hashtable *hash = bat_priv->orig_hash;
|
|
struct hlist_head *head;
|
|
struct batadv_hard_iface *hard_iface_tmp;
|
|
struct batadv_orig_node *orig_node;
|
|
struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
|
|
uint32_t i;
|
|
int ret;
|
|
|
|
/* resize all orig nodes because orig_node->bcast_own(_sum) depend on
|
|
* if_num
|
|
*/
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
|
|
ret = 0;
|
|
if (bao->bat_orig_del_if)
|
|
ret = bao->bat_orig_del_if(orig_node,
|
|
max_if_num,
|
|
hard_iface->if_num);
|
|
if (ret == -ENOMEM)
|
|
goto err;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* renumber remaining batman interfaces _inside_ of orig_hash_lock */
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) {
|
|
if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE)
|
|
continue;
|
|
|
|
if (hard_iface == hard_iface_tmp)
|
|
continue;
|
|
|
|
if (hard_iface->soft_iface != hard_iface_tmp->soft_iface)
|
|
continue;
|
|
|
|
if (hard_iface_tmp->if_num > hard_iface->if_num)
|
|
hard_iface_tmp->if_num--;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
hard_iface->if_num = -1;
|
|
return 0;
|
|
|
|
err:
|
|
rcu_read_unlock();
|
|
return -ENOMEM;
|
|
}
|