- 根目录:
- net
- batman-adv
- originator.c
/* Copyright (C) 2009-2014 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "main.h"
#include "distributed-arp-table.h"
#include "originator.h"
#include "hash.h"
#include "translation-table.h"
#include "routing.h"
#include "gateway_client.h"
#include "hard-interface.h"
#include "soft-interface.h"
#include "bridge_loop_avoidance.h"
#include "network-coding.h"
#include "fragmentation.h"
#include "multicast.h"
/* hash class keys */
static struct lock_class_key batadv_orig_hash_lock_class_key;
static void batadv_purge_orig(struct work_struct *work);
/* returns 1 if they are the same originator */
int batadv_compare_orig(const struct hlist_node *node, const void *data2)
{
const void *data1 = container_of(node, struct batadv_orig_node,
hash_entry);
return batadv_compare_eth(data1, data2);
}
/**
* batadv_orig_node_vlan_get - get an orig_node_vlan object
* @orig_node: the originator serving the VLAN
* @vid: the VLAN identifier
*
* Returns the vlan object identified by vid and belonging to orig_node or NULL
* if it does not exist.
*/
struct batadv_orig_node_vlan *
batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
unsigned short vid)
{
struct batadv_orig_node_vlan *vlan = NULL, *tmp;
rcu_read_lock();
list_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) {
if (tmp->vid != vid)
continue;
if (!atomic_inc_not_zero(&tmp->refcount))
continue;
vlan = tmp;
break;
}
rcu_read_unlock();
return vlan;
}
/**
* batadv_orig_node_vlan_new - search and possibly create an orig_node_vlan
* object
* @orig_node: the originator serving the VLAN
* @vid: the VLAN identifier
*
* Returns NULL in case of failure or the vlan object identified by vid and
* belonging to orig_node otherwise. The object is created and added to the list
* if it does not exist.
*
* The object is returned with refcounter increased by 1.
*/
struct batadv_orig_node_vlan *
batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
unsigned short vid)
{
struct batadv_orig_node_vlan *vlan;
spin_lock_bh(&orig_node->vlan_list_lock);
/* first look if an object for this vid already exists */
vlan = batadv_orig_node_vlan_get(orig_node, vid);
if (vlan)
goto out;
vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
if (!vlan)
goto out;
atomic_set(&vlan->refcount, 2);
vlan->vid = vid;
list_add_rcu(&vlan->list, &orig_node->vlan_list);
out:
spin_unlock_bh(&orig_node->vlan_list_lock);
return vlan;
}
/**
* batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly free
* the originator-vlan object
* @orig_vlan: the originator-vlan object to release
*/
void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan)
{
if (atomic_dec_and_test(&orig_vlan->refcount))
kfree_rcu(orig_vlan, rcu);
}
int batadv_originator_init(struct batadv_priv *bat_priv)
{
if (bat_priv->orig_hash)
return 0;
bat_priv->orig_hash = batadv_hash_new(1024);
if (!bat_priv->orig_hash)
goto err;
batadv_hash_set_lock_class(bat_priv->orig_hash,
&batadv_orig_hash_lock_class_key);
INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig);
queue_delayed_work(batadv_event_workqueue,
&bat_priv->orig_work,
msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
return 0;
err:
return -ENOMEM;
}
/**
* batadv_neigh_ifinfo_free_rcu - free the neigh_ifinfo object
* @rcu: rcu pointer of the neigh_ifinfo object
*/
static void batadv_neigh_ifinfo_free_rcu(struct rcu_head *rcu)
{
struct batadv_neigh_ifinfo *neigh_ifinfo;
neigh_ifinfo = container_of(rcu, struct batadv_neigh_ifinfo, rcu);
if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
batadv_hardif_free_ref_now(neigh_ifinfo->if_outgoing);
kfree(neigh_ifinfo);
}
/**
* batadv_neigh_ifinfo_free_now - decrement the refcounter and possibly free
* the neigh_ifinfo (without rcu callback)
* @neigh_ifinfo: the neigh_ifinfo object to release
*/
static void
batadv_neigh_ifinfo_free_ref_now(struct batadv_neigh_ifinfo *neigh_ifinfo)
{
if (atomic_dec_and_test(&neigh_ifinfo->refcount))
batadv_neigh_ifinfo_free_rcu(&neigh_ifinfo->rcu);
}
/**
* batadv_neigh_ifinfo_free_ref - decrement the refcounter and possibly free
* the neigh_ifinfo
* @neigh_ifinfo: the neigh_ifinfo object to release
*/
void batadv_neigh_ifinfo_free_ref(struct batadv_neigh_ifinfo *neigh_ifinfo)
{
if (atomic_dec_and_test(&neigh_ifinfo->refcount))
call_rcu(&neigh_ifinfo->rcu, batadv_neigh_ifinfo_free_rcu);
}
/**
* batadv_neigh_node_free_rcu - free the neigh_node
* @rcu: rcu pointer of the neigh_node
*/
static void batadv_neigh_node_free_rcu(struct rcu_head *rcu)
{
struct hlist_node *node_tmp;
struct batadv_neigh_node *neigh_node;
struct batadv_neigh_ifinfo *neigh_ifinfo;
neigh_node = container_of(rcu, struct batadv_neigh_node, rcu);
hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
&neigh_node->ifinfo_list, list) {
batadv_neigh_ifinfo_free_ref_now(neigh_ifinfo);
}
batadv_hardif_free_ref_now(neigh_node->if_incoming);
kfree(neigh_node);
}
/**
* batadv_neigh_node_free_ref_now - decrement the neighbors refcounter
* and possibly free it (without rcu callback)
* @neigh_node: neigh neighbor to free
*/
static void
batadv_neigh_node_free_ref_now(struct batadv_neigh_node *neigh_node)
{
if (atomic_dec_and_test(&neigh_node->refcount))
batadv_neigh_node_free_rcu(&neigh_node->rcu);
}
/**
* batadv_neigh_node_free_ref - decrement the neighbors refcounter
* and possibly free it
* @neigh_node: neigh neighbor to free
*/
void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node)
{
if (atomic_dec_and_test(&neigh_node->refcount))
call_rcu(&neigh_node->rcu, batadv_neigh_node_free_rcu);
}
/**
* batadv_orig_node_get_router - router to the originator depending on iface
* @orig_node: the orig node for the router
* @if_outgoing: the interface where the payload packet has been received or
* the OGM should be sent to
*
* Returns the neighbor which should be router for this orig_node/iface.
*
* The object is returned with refcounter increased by 1.
*/
struct batadv_neigh_node *
batadv_orig_router_get(struct batadv_orig_node *orig_node,
const struct batadv_hard_iface *if_outgoing)
{
struct batadv_orig_ifinfo *orig_ifinfo;
struct batadv_neigh_node *router = NULL;
rcu_read_lock();
hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) {
if (orig_ifinfo->if_outgoing != if_outgoing)
continue;
router = rcu_dereference(orig_ifinfo->router);
break;
}
if (router && !atomic_inc_not_zero(&router->refcount))
router = NULL;
rcu_read_unlock();
return router;
}
/**
* batadv_orig_ifinfo_get - find the ifinfo from an orig_node
* @orig_node: the orig node to be queried
* @if_outgoing: the interface for which the ifinfo should be acquired
*
* Returns the requested orig_ifinfo or NULL if not found.
*
* The object is returned with refcounter increased by 1.
*/
struct batadv_orig_ifinfo *
batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
struct batadv_hard_iface *if_outgoing)
{
struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL;
rcu_read_lock();
hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list,
list) {
if (tmp->if_outgoing != if_outgoing)
continue;
if (!atomic_inc_not_zero(&tmp->refcount))
continue;
orig_ifinfo = tmp;
break;
}
rcu_read_unlock();
return orig_ifinfo;
}
/**
* batadv_orig_ifinfo_new - search and possibly create an orig_ifinfo object
* @orig_node: the orig node to be queried
* @if_outgoing: the interface for which the ifinfo should be acquired
*
* Returns NULL in case of failure or the orig_ifinfo object for the if_outgoing
* interface otherwise. The object is created and added to the list
* if it does not exist.
*
* The object is returned with refcounter increased by 1.
*/
struct batadv_orig_ifinfo *
batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
struct batadv_hard_iface *if_outgoing)
{
struct batadv_orig_ifinfo *orig_ifinfo = NULL;
unsigned long reset_time;
spin_lock_bh(&orig_node->neigh_list_lock);
orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing);
if (orig_ifinfo)
goto out;
orig_ifinfo = kzalloc(sizeof(*orig_ifinfo), GFP_ATOMIC);
if (!orig_ifinfo)
goto out;
if (if_outgoing != BATADV_IF_DEFAULT &&
!atomic_inc_not_zero(&if_outgoing->refcount)) {
kfree(orig_ifinfo);
orig_ifinfo = NULL;
goto out;
}
reset_time = jiffies - 1;
reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
orig_ifinfo->batman_seqno_reset = reset_time;
orig_ifinfo->if_outgoing = if_outgoing;
INIT_HLIST_NODE(&orig_ifinfo->list);
atomic_set(&orig_ifinfo->refcount, 2);
hlist_add_head_rcu(&orig_ifinfo->list,
&orig_node->ifinfo_list);
out:
spin_unlock_bh(&orig_node->neigh_list_lock);
return orig_ifinfo;
}
/**
* batadv_neigh_ifinfo_get - find the ifinfo from an neigh_node
* @neigh_node: the neigh node to be queried
* @if_outgoing: the interface for which the ifinfo should be acquired
*
* The object is returned with refcounter increased by 1.
*
* Returns the requested neigh_ifinfo or NULL if not found
*/
struct batadv_neigh_ifinfo *
batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh,
struct batadv_hard_iface *if_outgoing)
{
struct batadv_neigh_ifinfo *neigh_ifinfo = NULL,
*tmp_neigh_ifinfo;
rcu_read_lock();
hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list,
list) {
if (tmp_neigh_ifinfo->if_outgoing != if_outgoing)
continue;
if (!atomic_inc_not_zero(&tmp_neigh_ifinfo->refcount))
continue;
neigh_ifinfo = tmp_neigh_ifinfo;
break;
}
rcu_read_unlock();
return neigh_ifinfo;
}
/**
* batadv_neigh_ifinfo_new - search and possibly create an neigh_ifinfo object
* @neigh_node: the neigh node to be queried
* @if_outgoing: the interface for which the ifinfo should be acquired
*
* Returns NULL in case of failure or the neigh_ifinfo object for the
* if_outgoing interface otherwise. The object is created and added to the list
* if it does not exist.
*
* The object is returned with refcounter increased by 1.
*/
struct batadv_neigh_ifinfo *
batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
struct batadv_hard_iface *if_outgoing)
{
struct batadv_neigh_ifinfo *neigh_ifinfo;
spin_lock_bh(&neigh->ifinfo_lock);
neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing);
if (neigh_ifinfo)
goto out;
neigh_ifinfo = kzalloc(sizeof(*neigh_ifinfo), GFP_ATOMIC);
if (!neigh_ifinfo)
goto out;
if (if_outgoing && !atomic_inc_not_zero(&if_outgoing->refcount)) {
kfree(neigh_ifinfo);
neigh_ifinfo = NULL;
goto out;
}
INIT_HLIST_NODE(&neigh_ifinfo->list);
atomic_set(&neigh_ifinfo->refcount, 2);
neigh_ifinfo->if_outgoing = if_outgoing;
hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list);
out:
spin_unlock_bh(&neigh->ifinfo_lock);
return neigh_ifinfo;
}
/**
* batadv_neigh_node_new - create and init a new neigh_node object
* @hard_iface: the interface where the neighbour is connected to
* @neigh_addr: the mac address of the neighbour interface
* @orig_node: originator object representing the neighbour
*
* Allocates a new neigh_node object and initialises all the generic fields.
* Returns the new object or NULL on failure.
*/
struct batadv_neigh_node *
batadv_neigh_node_new(struct batadv_hard_iface *hard_iface,
const uint8_t *neigh_addr,
struct batadv_orig_node *orig_node)
{
struct batadv_neigh_node *neigh_node;
neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC);
if (!neigh_node)
goto out;
INIT_HLIST_NODE(&neigh_node->list);
INIT_HLIST_HEAD(&neigh_node->ifinfo_list);
spin_lock_init(&neigh_node->ifinfo_lock);
ether_addr_copy(neigh_node->addr, neigh_addr);
neigh_node->if_incoming = hard_iface;
neigh_node->orig_node = orig_node;
/* extra reference for return */
atomic_set(&neigh_node->refcount, 2);
out:
return neigh_node;
}
/**
* batadv_neigh_node_get - retrieve a neighbour from the list
* @orig_node: originator which the neighbour belongs to
* @hard_iface: the interface where this neighbour is connected to
* @addr: the address of the neighbour
*
* Looks for and possibly returns a neighbour belonging to this originator list
* which is connected through the provided hard interface.
* Returns NULL if the neighbour is not found.
*/
struct batadv_neigh_node *
batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
const struct batadv_hard_iface *hard_iface,
const uint8_t *addr)
{
struct batadv_neigh_node *tmp_neigh_node, *res = NULL;
rcu_read_lock();
hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) {
if (!batadv_compare_eth(tmp_neigh_node->addr, addr))
continue;
if (tmp_neigh_node->if_incoming != hard_iface)
continue;
if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
continue;
res = tmp_neigh_node;
break;
}
rcu_read_unlock();
return res;
}
/**
* batadv_orig_ifinfo_free_rcu - free the orig_ifinfo object
* @rcu: rcu pointer of the orig_ifinfo object
*/
static void batadv_orig_ifinfo_free_rcu(struct rcu_head *rcu)
{
struct batadv_orig_ifinfo *orig_ifinfo;
struct batadv_neigh_node *router;
orig_ifinfo = container_of(rcu, struct batadv_orig_ifinfo, rcu);
if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
batadv_hardif_free_ref_now(orig_ifinfo->if_outgoing);
/* this is the last reference to this object */
router = rcu_dereference_protected(orig_ifinfo->router, true);
if (router)
batadv_neigh_node_free_ref_now(router);
kfree(orig_ifinfo);
}
/**
* batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free
* the orig_ifinfo (without rcu callback)
* @orig_ifinfo: the orig_ifinfo object to release
*/
static void
batadv_orig_ifinfo_free_ref_now(struct batadv_orig_ifinfo *orig_ifinfo)
{
if (atomic_dec_and_test(&orig_ifinfo->refcount))
batadv_orig_ifinfo_free_rcu(&orig_ifinfo->rcu);
}
/**
* batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free
* the orig_ifinfo
* @orig_ifinfo: the orig_ifinfo object to release
*/
void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo)
{
if (atomic_dec_and_test(&orig_ifinfo->refcount))
call_rcu(&orig_ifinfo->rcu, batadv_orig_ifinfo_free_rcu);
}
static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
{
struct hlist_node *node_tmp;
struct batadv_neigh_node *neigh_node;
struct batadv_orig_node *orig_node;
struct batadv_orig_ifinfo *orig_ifinfo;
orig_node = container_of(rcu, struct batadv_orig_node, rcu);
spin_lock_bh(&orig_node->neigh_list_lock);
/* for all neighbors towards this originator ... */
hlist_for_each_entry_safe(neigh_node, node_tmp,
&orig_node->neigh_list, list) {
hlist_del_rcu(&neigh_node->list);
batadv_neigh_node_free_ref_now(neigh_node);
}
hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
&orig_node->ifinfo_list, list) {
hlist_del_rcu(&orig_ifinfo->list);
batadv_orig_ifinfo_free_ref_now(orig_ifinfo);
}
spin_unlock_bh(&orig_node->neigh_list_lock);
batadv_mcast_purge_orig(orig_node);
/* Free nc_nodes */
batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
batadv_frag_purge_orig(orig_node, NULL);
batadv_tt_global_del_orig(orig_node->bat_priv, orig_node, -1,
"originator timed out");
if (orig_node->bat_priv->bat_algo_ops->bat_orig_free)
orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node);
kfree(orig_node->tt_buff);
kfree(orig_node);
}
/**
* batadv_orig_node_free_ref - decrement the orig node refcounter and possibly
* schedule an rcu callback for freeing it
* @orig_node: the orig node to free
*/
void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
{
if (atomic_dec_and_test(&orig_node->refcount))
call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
}
/**
* batadv_orig_node_free_ref_now - decrement the orig node refcounter and
* possibly free it (without rcu callback)
* @orig_node: the orig node to free
*/
void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node)
{
if (atomic_dec_and_test(&orig_node->refcount))
batadv_orig_node_free_rcu(&orig_node->rcu);
}
void batadv_originator_free(struct batadv_priv *bat_priv)
{
struct batadv_hashtable *hash = bat_priv->orig_hash;
struct hlist_node *node_tmp;
struct hlist_head *head;
spinlock_t *list_lock; /* spinlock to protect write access */
struct batadv_orig_node *orig_node;
uint32_t i;
if (!hash)
return;
cancel_delayed_work_sync(&bat_priv->orig_work);
bat_priv->orig_hash = NULL;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
list_lock = &hash->list_locks[i];
spin_lock_bh(list_lock);
hlist_for_each_entry_safe(orig_node, node_tmp,
head, hash_entry) {
hlist_del_rcu(&orig_node->hash_entry);
batadv_orig_node_free_ref(orig_node);
}
spin_unlock_bh(list_lock);
}
batadv_hash_destroy(hash);
}
/**
* batadv_orig_node_new - creates a new orig_node
* @bat_priv: the bat priv with all the soft interface information
* @addr: the mac address of the originator
*
* Creates a new originator object and initialise all the generic fields.
* The new object is not added to the originator list.
* Returns the newly created object or NULL on failure.
*/
struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
const uint8_t *addr)
{
struct batadv_orig_node *orig_node;
struct batadv_orig_node_vlan *vlan;
unsigned long reset_time;
int i;
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Creating new originator: %pM\n", addr);
orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC);
if (!orig_node)
return NULL;
INIT_HLIST_HEAD(&orig_node->neigh_list);
INIT_LIST_HEAD(&orig_node->vlan_list);
INIT_HLIST_HEAD(&orig_node->ifinfo_list);
spin_lock_init(&orig_node->bcast_seqno_lock);
spin_lock_init(&orig_node->neigh_list_lock);
spin_lock_init(&orig_node->tt_buff_lock);
spin_lock_init(&orig_node->tt_lock);
spin_lock_init(&orig_node->vlan_list_lock);
batadv_nc_init_orig(orig_node);
/* extra reference for return */
atomic_set(&orig_node->refcount, 2);
orig_node->bat_priv = bat_priv;
ether_addr_copy(orig_node->orig, addr);
batadv_dat_init_orig_node_addr(orig_node);
atomic_set(&orig_node->last_ttvn, 0);
orig_node->tt_buff = NULL;
orig_node->tt_buff_len = 0;
reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
orig_node->bcast_seqno_reset = reset_time;
#ifdef CONFIG_BATMAN_ADV_MCAST
orig_node->mcast_flags = BATADV_NO_FLAGS;
#endif
/* create a vlan object for the "untagged" LAN */
vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);
if (!vlan)
goto free_orig_node;
/* batadv_orig_node_vlan_new() increases the refcounter.
* Immediately release vlan since it is not needed anymore in this
* context
*/
batadv_orig_node_vlan_free_ref(vlan);
for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
INIT_HLIST_HEAD(&orig_node->fragments[i].head);
spin_lock_init(&orig_node->fragments[i].lock);
orig_node->fragments[i].size = 0;
}
return orig_node;
free_orig_node:
kfree(orig_node);
return NULL;
}
/**
* batadv_purge_neigh_ifinfo - purge obsolete ifinfo entries from neighbor
* @bat_priv: the bat priv with all the soft interface information
* @neigh: orig node which is to be checked
*/
static void
batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv,
struct batadv_neigh_node *neigh)
{
struct batadv_neigh_ifinfo *neigh_ifinfo;
struct batadv_hard_iface *if_outgoing;
struct hlist_node *node_tmp;
spin_lock_bh(&neigh->ifinfo_lock);
/* for all ifinfo objects for this neighinator */
hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
&neigh->ifinfo_list, list) {
if_outgoing = neigh_ifinfo->if_outgoing;
/* always keep the default interface */
if (if_outgoing == BATADV_IF_DEFAULT)
continue;
/* don't purge if the interface is not (going) down */
if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
(if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
(if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
continue;
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"neighbor/ifinfo purge: neighbor %pM, iface: %s\n",
neigh->addr, if_outgoing->net_dev->name);
hlist_del_rcu(&neigh_ifinfo->list);
batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
}
spin_unlock_bh(&neigh->ifinfo_lock);
}
/**
* batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: orig node which is to be checked
*
* Returns true if any ifinfo entry was purged, false otherwise.
*/
static bool
batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node)
{
struct batadv_orig_ifinfo *orig_ifinfo;
struct batadv_hard_iface *if_outgoing;
struct hlist_node *node_tmp;
bool ifinfo_purged = false;
spin_lock_bh(&orig_node->neigh_list_lock);
/* for all ifinfo objects for this originator */
hlist_for_each_entry_safe(orig_ifinfo, node_tmp,
&orig_node->ifinfo_list, list) {
if_outgoing = orig_ifinfo->if_outgoing;
/* always keep the default interface */
if (if_outgoing == BATADV_IF_DEFAULT)
continue;
/* don't purge if the interface is not (going) down */
if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
(if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
(if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
continue;
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"router/ifinfo purge: originator %pM, iface: %s\n",
orig_node->orig, if_outgoing->net_dev->name);
ifinfo_purged = true;
hlist_del_rcu(&orig_ifinfo->list);
batadv_orig_ifinfo_free_ref(orig_ifinfo);
if (orig_node->last_bonding_candidate == orig_ifinfo) {
orig_node->last_bonding_candidate = NULL;
batadv_orig_ifinfo_free_ref(orig_ifinfo);
}
}
spin_unlock_bh(&orig_node->neigh_list_lock);
return ifinfo_purged;
}
/**
* batadv_purge_orig_neighbors - purges neighbors from originator
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: orig node which is to be checked
*
* Returns true if any neighbor was purged, false otherwise
*/
static bool
batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node)
{
struct hlist_node *node_tmp;
struct batadv_neigh_node *neigh_node;
bool neigh_purged = false;
unsigned long last_seen;
struct batadv_hard_iface *if_incoming;
spin_lock_bh(&orig_node->neigh_list_lock);
/* for all neighbors towards this originator ... */
hlist_for_each_entry_safe(neigh_node, node_tmp,
&orig_node->neigh_list, list) {
last_seen = neigh_node->last_seen;
if_incoming = neigh_node->if_incoming;
if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) ||
(if_incoming->if_status == BATADV_IF_INACTIVE) ||
(if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
(if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) {
if ((if_incoming->if_status == BATADV_IF_INACTIVE) ||
(if_incoming->if_status == BATADV_IF_NOT_IN_USE) ||
(if_incoming->if_status == BATADV_IF_TO_BE_REMOVED))
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"neighbor purge: originator %pM, neighbor: %pM, iface: %s\n",
orig_node->orig, neigh_node->addr,
if_incoming->net_dev->name);
else
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n",
orig_node->orig, neigh_node->addr,
jiffies_to_msecs(last_seen));
neigh_purged = true;
hlist_del_rcu(&neigh_node->list);
batadv_neigh_node_free_ref(neigh_node);
} else {
/* only necessary if not the whole neighbor is to be
* deleted, but some interface has been removed.
*/
batadv_purge_neigh_ifinfo(bat_priv, neigh_node);
}
}
spin_unlock_bh(&orig_node->neigh_list_lock);
return neigh_purged;
}
/**
* batadv_find_best_neighbor - finds the best neighbor after purging
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: orig node which is to be checked
* @if_outgoing: the interface for which the metric should be compared
*
* Returns the current best neighbor, with refcount increased.
*/
static struct batadv_neigh_node *
batadv_find_best_neighbor(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
struct batadv_hard_iface *if_outgoing)
{
struct batadv_neigh_node *best = NULL, *neigh;
struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
rcu_read_lock();
hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) {
if (best && (bao->bat_neigh_cmp(neigh, if_outgoing,
best, if_outgoing) <= 0))
continue;
if (!atomic_inc_not_zero(&neigh->refcount))
continue;
if (best)
batadv_neigh_node_free_ref(best);
best = neigh;
}
rcu_read_unlock();
return best;
}
/**
* batadv_purge_orig_node - purges obsolete information from an orig_node
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: orig node which is to be checked
*
* This function checks if the orig_node or substructures of it have become
* obsolete, and purges this information if that's the case.
*
* Returns true if the orig_node is to be removed, false otherwise.
*/
static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node)
{
struct batadv_neigh_node *best_neigh_node;
struct batadv_hard_iface *hard_iface;
bool changed_ifinfo, changed_neigh;
if (batadv_has_timed_out(orig_node->last_seen,
2 * BATADV_PURGE_TIMEOUT)) {
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Originator timeout: originator %pM, last_seen %u\n",
orig_node->orig,
jiffies_to_msecs(orig_node->last_seen));
return true;
}
changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node);
changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node);
if (!changed_ifinfo && !changed_neigh)
return false;
/* first for NULL ... */
best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node,
BATADV_IF_DEFAULT);
batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT,
best_neigh_node);
if (best_neigh_node)
batadv_neigh_node_free_ref(best_neigh_node);
/* ... then for all other interfaces. */
rcu_read_lock();
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
if (hard_iface->if_status != BATADV_IF_ACTIVE)
continue;
if (hard_iface->soft_iface != bat_priv->soft_iface)
continue;
best_neigh_node = batadv_find_best_neighbor(bat_priv,
orig_node,
hard_iface);
batadv_update_route(bat_priv, orig_node, hard_iface,
best_neigh_node);
if (best_neigh_node)
batadv_neigh_node_free_ref(best_neigh_node);
}
rcu_read_unlock();
return false;
}
static void _batadv_purge_orig(struct batadv_priv *bat_priv)
{
struct batadv_hashtable *hash = bat_priv->orig_hash;
struct hlist_node *node_tmp;
struct hlist_head *head;
spinlock_t *list_lock; /* spinlock to protect write access */
struct batadv_orig_node *orig_node;
uint32_t i;
if (!hash)
return;
/* for all origins... */
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
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,
BATADV_IF_DEFAULT);
return 0;
}
/**
* batadv_orig_hardif_seq_print_text - writes originator infos for a specific
* outgoing interface
* @seq: debugfs table seq_file struct
* @offset: not used
*
* Returns 0
*/
int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset)
{
struct net_device *net_dev = (struct net_device *)seq->private;
struct batadv_hard_iface *hard_iface;
struct batadv_priv *bat_priv;
hard_iface = batadv_hardif_get_by_netdev(net_dev);
if (!hard_iface || !hard_iface->soft_iface) {
seq_puts(seq, "Interface not known to B.A.T.M.A.N.\n");
goto out;
}
bat_priv = netdev_priv(hard_iface->soft_iface);
if (!bat_priv->bat_algo_ops->bat_orig_print) {
seq_puts(seq,
"No printing function for this routing protocol\n");
goto out;
}
if (hard_iface->if_status != BATADV_IF_ACTIVE) {
seq_puts(seq, "Interface not active\n");
goto out;
}
seq_printf(seq, "[B.A.T.M.A.N. adv %s, IF/MAC: %s/%pM (%s %s)]\n",
BATADV_SOURCE_VERSION, hard_iface->net_dev->name,
hard_iface->net_dev->dev_addr,
hard_iface->soft_iface->name, bat_priv->bat_algo_ops->name);
bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface);
out:
if (hard_iface)
batadv_hardif_free_ref(hard_iface);
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;
}