// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*/
#include "originator.h"
#include "main.h"
#include <linux/atomic.h>
#include <linux/container_of.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/gfp.h>
#include <linux/if_vlan.h>
#include <linux/jiffies.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/workqueue.h>
#include <net/sock.h>
#include <uapi/linux/batadv_packet.h>
#include <uapi/linux/batman_adv.h>
#include "bat_algo.h"
#include "distributed-arp-table.h"
#include "fragmentation.h"
#include "gateway_client.h"
#include "hard-interface.h"
#include "hash.h"
#include "log.h"
#include "multicast.h"
#include "netlink.h"
#include "network-coding.h"
#include "routing.h"
#include "soft-interface.h"
#include "translation-table.h"
/* hash class keys */
static struct lock_class_key batadv_orig_hash_lock_class_key;
/**
* batadv_orig_hash_find() - Find and return originator from orig_hash
* @bat_priv: the bat priv with all the soft interface information
* @data: mac address of the originator
*
* Return: orig_node (with increased refcnt), NULL on errors
*/
struct batadv_orig_node *
batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data)
{
struct batadv_hashtable *hash = bat_priv->orig_hash;
struct hlist_head *head;
struct batadv_orig_node *orig_node, *orig_node_tmp = NULL;
int index;
if (!hash)
return NULL;
index = batadv_choose_orig(data, hash->size);
head = &hash->table[index];
rcu_read_lock();
hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
if (!batadv_compare_eth(orig_node, data))
continue;
if (!kref_get_unless_zero(&orig_node->refcount))
continue;
orig_node_tmp = orig_node;
break;
}
rcu_read_unlock();
return orig_node_tmp;
}
static void batadv_purge_orig(struct work_struct *work);
/**
* batadv_compare_orig() - comparing function used in the originator hash table
* @node: node in the local table
* @data2: second object to compare the node to
*
* Return: true if they are the same originator
*/
bool 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
*
* Return: 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();
hlist_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) {
if (tmp->vid != vid)
continue;
if (!kref_get_unless_zero(&tmp->refcount))
continue;
vlan = tmp;
break;
}
rcu_read_unlock();
return vlan;
}
/**
* batadv_vlan_id_valid() - check if vlan id is in valid batman-adv encoding
* @vid: the VLAN identifier
*
* Return: true when either no vlan is set or if VLAN is in correct range,
* false otherwise
*/
static bool batadv_vlan_id_valid(unsigned short vid)
{
unsigned short non_vlan = vid & ~(BATADV_VLAN_HAS_TAG | VLAN_VID_MASK);
if (vid == 0)
return true;
if (!(vid & BATADV_VLAN_HAS_TAG))
return false;
if (non_vlan)
return false;
return true;
}
/**
* 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
*
* Return: 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;
if (!batadv_vlan_id_valid(vid))
return NULL;
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;
kref_init(&vlan->refcount);
vlan->vid = vid;
kref_get(&vlan->refcount);
hlist_add_head_rcu(&vlan->list, &orig_node->vlan_list);
out:
spin_unlock_bh(&orig_node->vlan_list_lock);
return vlan;
}
/**
* batadv_orig_node_vlan_release() - release originator-vlan object from lists
* and queue for free after rcu grace period
* @ref: kref pointer of the originator-vlan object
*/
void batadv_orig_node_vlan_release(struct kref *ref)
{
struct batadv_orig_node_vlan *orig_vlan;
orig_vlan = container_of(ref, struct batadv_orig_node_vlan, refcount);
kfree_rcu(orig_vlan, rcu);
}
/**
* batadv_originator_init() - Initialize all originator structures
* @bat_priv: the bat priv with all the soft interface information
*
* Return: 0 on success or negative error number in case of failure
*/
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_release() - release neigh_ifinfo from lists and queue for
* free after rcu grace period
* @ref: kref pointer of the neigh_ifinfo
*/
void batadv_neigh_ifinfo_release(struct kref *ref)
{
struct batadv_neigh_ifinfo *neigh_ifinfo;
neigh_ifinfo = container_of(ref, struct batadv_neigh_ifinfo, refcount);
if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
batadv_hardif_put(neigh_ifinfo->if_outgoing);
kfree_rcu(neigh_ifinfo, rcu);
}
/**
* batadv_hardif_neigh_release() - release hardif neigh node from lists and
* queue for free after rcu grace period
* @ref: kref pointer of the neigh_node
*/
void batadv_hardif_neigh_release(struct kref *ref)
{
struct batadv_hardif_neigh_node *hardif_neigh;
hardif_neigh = container_of(ref, struct batadv_hardif_neigh_node,
refcount);
spin_lock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
hlist_del_init_rcu(&hardif_neigh->list);
spin_unlock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
batadv_hardif_put(hardif_neigh->if_incoming);
kfree_rcu(hardif_neigh, rcu);
}
/**
* batadv_neigh_node_release() - release neigh_node from lists and queue for
* free after rcu grace period
* @ref: kref pointer of the neigh_node
*/
void batadv_neigh_node_release(struct kref *ref)
{
struct hlist_node *node_tmp;
struct batadv_neigh_node *neigh_node;
struct batadv_neigh_ifinfo *neigh_ifinfo;
neigh_node = container_of(ref, struct batadv_neigh_node, refcount);
hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
&neigh_node->ifinfo_list, list) {
batadv_neigh_ifinfo_put(neigh_ifinfo);
}
batadv_hardif_neigh_put(neigh_node->hardif_neigh);
batadv_hardif_put(neigh_node->if_incoming);
kfree_rcu(neigh_node, rcu);
}
/**
* batadv_orig_router_get() - 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
*
* Return: the neighbor which should be the 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 && !kref_get_unless_zero(&router->refcount))
router = NULL;
rcu_read_unlock();
return router;
}
/**
* batadv_orig_to_router() - get next hop neighbor to an orig address
* @bat_priv: the bat priv with all the soft interface information
* @orig_addr: the originator MAC address to search the best next hop router for
* @if_outgoing: the interface where the payload packet has been received or
* the OGM should be sent to
*
* Return: A neighbor node which is the best router towards the given originator
* address.
*/
struct batadv_neigh_node *
batadv_orig_to_router(struct batadv_priv *bat_priv, u8 *orig_addr,
struct batadv_hard_iface *if_outgoing)
{
struct batadv_neigh_node *neigh_node;
struct batadv_orig_node *orig_node;
orig_node = batadv_orig_hash_find(bat_priv, orig_addr);
if (!orig_node)
return NULL;
neigh_node = batadv_find_router(bat_priv, orig_node, if_outgoing);
batadv_orig_node_put(orig_node);
return neigh_node;
}
/**
* 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
*
* Return: 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 (!kref_get_unless_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
*
* Return: 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;
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)
kref_get(&if_outgoing->refcount);
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);
kref_init(&orig_ifinfo->refcount);
kref_get(&orig_ifinfo->refcount);
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: 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.
*
* Return: 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 (!kref_get_unless_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: the neigh node to be queried
* @if_outgoing: the interface for which the ifinfo should be acquired
*
* Return: 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)
kref_get(&if_outgoing->refcount);
INIT_HLIST_NODE(&neigh_ifinfo->list);
kref_init(&neigh_ifinfo->refcount);
neigh_ifinfo->if_outgoing = if_outgoing;
kref_get(&neigh_ifinfo->refcount);
hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list);
out:
spin_unlock_bh(&neigh->ifinfo_lock);
return neigh_ifinfo;
}
/**
* 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.
*
* Return: neighbor when found. Otherwise NULL
*/
static struct batadv_neigh_node *
batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
const struct batadv_hard_iface *hard_iface,
const u8 *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 (!kref_get_unless_zero(&tmp_neigh_node->refcount))
continue;
res = tmp_neigh_node;
break;
}
rcu_read_unlock();
return res;
}
/**
* batadv_hardif_neigh_create() - create a hardif neighbour node
* @hard_iface: the interface this neighbour is connected to
* @neigh_addr: the interface address of the neighbour to retrieve
* @orig_node: originator object representing the neighbour
*
* Return: the hardif neighbour node if found or created or NULL otherwise.
*/
static struct batadv_hardif_neigh_node *
batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface,
const u8 *neigh_addr,
struct batadv_orig_node *orig_node)
{
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
struct batadv_hardif_neigh_node *hardif_neigh;
spin_lock_bh(&hard_iface->neigh_list_lock);
/* check if neighbor hasn't been added in the meantime */
hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr);
if (hardif_neigh)
goto out;
hardif_neigh = kzalloc(sizeof(*hardif_neigh), GFP_ATOMIC);
if (!hardif_neigh)
goto out;
kref_get(&hard_iface->refcount);
INIT_HLIST_NODE(&hardif_neigh->list);
ether_addr_copy(hardif_neigh->addr, neigh_addr);
ether_addr_copy(hardif_neigh->orig, orig_node->orig);
hardif_neigh->if_incoming = hard_iface;
hardif_neigh->last_seen = jiffies;
kref_init(&hardif_neigh->refcount);
if (bat_priv->algo_ops->neigh.hardif_init)
bat_priv->algo_ops->neigh.hardif_init(hardif_neigh);
hlist_add_head_rcu(&hardif_neigh->list, &hard_iface->neigh_list);
out:
spin_unlock_bh(&hard_iface->neigh_list_lock);
return hardif_neigh;
}
/**
* batadv_hardif_neigh_get_or_create() - retrieve or create a hardif neighbour
* node
* @hard_iface: the interface this neighbour is connected to
* @neigh_addr: the interface address of the neighbour to retrieve
* @orig_node: originator object representing the neighbour
*
* Return: the hardif neighbour node if found or created or NULL otherwise.
*/
static struct batadv_hardif_neigh_node *
batadv_hardif_neigh_get_or_create(struct batadv_hard_iface *hard_iface,
const u8 *neigh_addr,
struct batadv_orig_node *orig_node)
{
struct batadv_hardif_neigh_node *hardif_neigh;
/* first check without locking to avoid the overhead */
hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr);
if (hardif_neigh)
return hardif_neigh;
return batadv_hardif_neigh_create(hard_iface, neigh_addr, orig_node);
}
/**
* batadv_hardif_neigh_get() - retrieve a hardif neighbour from the list
* @hard_iface: the interface where this neighbour is connected to
* @neigh_addr: the address of the neighbour
*
* Looks for and possibly returns a neighbour belonging to this hard interface.
*
* Return: neighbor when found. Otherwise NULL
*/
struct batadv_hardif_neigh_node *
batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface,
const u8 *neigh_addr)
{
struct batadv_hardif_neigh_node *tmp_hardif_neigh, *hardif_neigh = NULL;
rcu_read_lock();
hlist_for_each_entry_rcu(tmp_hardif_neigh,
&hard_iface->neigh_list, list) {
if (!batadv_compare_eth(tmp_hardif_neigh->addr, neigh_addr))
continue;
if (!kref_get_unless_zero(&tmp_hardif_neigh->refcount))
continue;
hardif_neigh = tmp_hardif_neigh;
break;
}
rcu_read_unlock();
return hardif_neigh;
}
/**
* batadv_neigh_node_create() - create a neigh node object
* @orig_node: originator object representing the neighbour
* @hard_iface: the interface where the neighbour is connected to
* @neigh_addr: the mac address of the neighbour interface
*
* Allocates a new neigh_node object and initialises all the generic fields.
*
* Return: the neighbour node if found or created or NULL otherwise.
*/
static struct batadv_neigh_node *
batadv_neigh_node_create(struct batadv_orig_node *orig_node,
struct batadv_hard_iface *hard_iface,
const u8 *neigh_addr)
{
struct batadv_neigh_node *neigh_node;
struct batadv_hardif_neigh_node *hardif_neigh = NULL;
spin_lock_bh(&orig_node->neigh_list_lock);
neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr);
if (neigh_node)
goto out;
hardif_neigh = batadv_hardif_neigh_get_or_create(hard_iface,
neigh_addr, orig_node);
if (!hardif_neigh)
goto out;
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);
kref_get(&hard_iface->refcount);
ether_addr_copy(neigh_node->addr, neigh_addr);
neigh_node->if_incoming = hard_iface;
neigh_node->orig_node = orig_node;
neigh_node->last_seen = jiffies;
/* increment unique neighbor refcount */
kref_get(&hardif_neigh->refcount);
neigh_node->hardif_neigh = hardif_neigh;
/* extra reference for return */
kref_init(&neigh_node->refcount);
kref_get(&neigh_node->refcount);
hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv,
"Creating new neighbor %pM for orig_node %pM on interface %s\n",
neigh_addr, orig_node->orig, hard_iface->net_dev->name);
out:
spin_unlock_bh(&orig_node->neigh_list_lock);
batadv_hardif_neigh_put(hardif_neigh);
return neigh_node;
}
/**
* batadv_neigh_node_get_or_create() - retrieve or create a neigh node object
* @orig_node: originator object representing the neighbour
* @hard_iface: the interface where the neighbour is connected to
* @neigh_addr: the mac address of the neighbour interface
*
* Return: the neighbour node if found or created or NULL otherwise.
*/
struct batadv_neigh_node *
batadv_neigh_node_get_or_create(struct batadv_orig_node *orig_node,
struct batadv_hard_iface *hard_iface,
const u8 *neigh_addr)
{
struct batadv_neigh_node *neigh_node;
/* first check without locking to avoid the overhead */
neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr);
if (neigh_node)
return neigh_node;
return batadv_neigh_node_create(orig_node, hard_iface, neigh_addr);
}
/**
* batadv_hardif_neigh_dump() - Dump to netlink the neighbor infos for a
* specific outgoing interface
* @msg: message to dump into
* @cb: parameters for the dump
*
* Return: 0 or error value
*/
int batadv_hardif_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb)
{
struct net *net = sock_net(cb->skb->sk);
struct net_device *soft_iface;
struct net_device *hard_iface = NULL;
struct batadv_hard_iface *hardif = BATADV_IF_DEFAULT;
struct batadv_priv *bat_priv;
struct batadv_hard_iface *primary_if = NULL;
int ret;
int ifindex, hard_ifindex;
ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
if (!ifindex)
return -EINVAL;
soft_iface = dev_get_by_index(net, ifindex);
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
ret = -ENODEV;
goto out;
}
bat_priv = netdev_priv(soft_iface);
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
ret = -ENOENT;
goto out;
}
hard_ifindex = batadv_netlink_get_ifindex(cb->nlh,
BATADV_ATTR_HARD_IFINDEX);
if (hard_ifindex) {
hard_iface = dev_get_by_index(net, hard_ifindex);
if (hard_iface)
hardif = batadv_hardif_get_by_netdev(hard_iface);
if (!hardif) {
ret = -ENODEV;
goto out;
}
if (hardif->soft_iface != soft_iface) {
ret = -ENOENT;
goto out;
}
}
if (!bat_priv->algo_ops->neigh.dump) {
ret = -EOPNOTSUPP;
goto out;
}
bat_priv->algo_ops->neigh.dump(msg, cb, bat_priv, hardif);
ret = msg->len;
out:
batadv_hardif_put(hardif);
dev_put(hard_iface);
batadv_hardif_put(primary_if);
dev_put(soft_iface);
return ret;
}
/**
* batadv_orig_ifinfo_release() - release orig_ifinfo from lists and queue for
* free after rcu grace period
* @ref: kref pointer of the orig_ifinfo
*/
void batadv_orig_ifinfo_release(struct kref *ref)
{
struct batadv_orig_ifinfo *orig_ifinfo;
struct batadv_neigh_node *router;
orig_ifinfo = container_of(ref, struct batadv_orig_ifinfo, refcount);
if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
batadv_hardif_put(orig_ifinfo->if_outgoing);
/* this is the last reference to this object */
router = rcu_dereference_protected(orig_ifinfo->router, true);
batadv_neigh_node_put(router);
kfree_rcu(orig_ifinfo, rcu);
}
/**
* batadv_orig_node_free_rcu() - free the orig_node
* @rcu: rcu pointer of the orig_node
*/
static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
{
struct batadv_orig_node *orig_node;
orig_node = container_of(rcu, struct batadv_orig_node, rcu);
batadv_mcast_purge_orig(orig_node);
batadv_frag_purge_orig(orig_node, NULL);
kfree(orig_node->tt_buff);
kfree(orig_node);
}
/**
* batadv_orig_node_release() - release orig_node from lists and queue for
* free after rcu grace period
* @ref: kref pointer of the orig_node
*/
void batadv_orig_node_release(struct kref *ref)
{
struct hlist_node *node_tmp;
struct batadv_neigh_node *neigh_node;
struct batadv_orig_node *orig_node;
struct batadv_orig_ifinfo *orig_ifinfo;
struct batadv_orig_node_vlan *vlan;
struct batadv_orig_ifinfo *last_candidate;
orig_node = container_of(ref, struct batadv_orig_node, refcount);
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_put(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_put(orig_ifinfo);
}
last_candidate = orig_node->last_bonding_candidate;
orig_node->last_bonding_candidate = NULL;
spin_unlock_bh(&orig_node->neigh_list_lock);
batadv_orig_ifinfo_put(last_candidate);
spin_lock_bh(&orig_node->vlan_list_lock);
hlist_for_each_entry_safe(vlan, node_tmp, &orig_node->vlan_list, list) {
hlist_del_rcu(&vlan->list);
batadv_orig_node_vlan_put(vlan);
}
spin_unlock_bh(&orig_node->vlan_list_lock);
/* Free nc_nodes */
batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
}
/**
* batadv_originator_free() - Free all originator structures
* @bat_priv: the bat priv with all the soft interface information
*/
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;
u32 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_put(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 initialises all the generic fields.
* The new object is not added to the originator list.
*
* Return: the newly created object or NULL on failure.
*/
struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
const u8 *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_HLIST_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 */
kref_init(&orig_node->refcount);
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;
orig_node->last_seen = jiffies;
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_MCAST_WANT_NO_RTR4;
orig_node->mcast_flags |= BATADV_MCAST_WANT_NO_RTR6;
orig_node->mcast_flags |= BATADV_MCAST_HAVE_MC_PTYPE_CAPA;
INIT_HLIST_NODE(&orig_node->mcast_want_all_unsnoopables_node);
INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv4_node);
INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv6_node);
spin_lock_init(&orig_node->mcast_handler_lock);
#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_put(vlan);
for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) {
INIT_HLIST_HEAD(&orig_node->fragments[i].fragment_list);
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_put(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
*
* Return: 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_put(orig_ifinfo);
if (orig_node->last_bonding_candidate == orig_ifinfo) {
orig_node->last_bonding_candidate = NULL;
batadv_orig_ifinfo_put(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
*
* Return: 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_put(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
*
* Return: 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->algo_ops;
rcu_read_lock();
hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) {
if (best && (bao->neigh.cmp(neigh, if_outgoing, best,
if_outgoing) <= 0))
continue;
if (!kref_get_unless_zero(&neigh->refcount))
continue;
batadv_neigh_node_put(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.
*
* Return: 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);
batadv_neigh_node_put(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;
if (!kref_get_unless_zero(&hard_iface->refcount))
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);
batadv_neigh_node_put(best_neigh_node);
batadv_hardif_put(hard_iface);
}
rcu_read_unlock();
return false;
}
/**
* batadv_purge_orig_ref() - Purge all outdated originators
* @bat_priv: the bat priv with all the soft interface information
*/
void batadv_purge_orig_ref(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;
u32 i;
if (!hash)
return;
/* for all origins... */
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
if (hlist_empty(head))
continue;
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_tt_global_del_orig(orig_node->bat_priv,
orig_node, -1,
"originator timed out");
batadv_orig_node_put(orig_node);
continue;
}
batadv_frag_purge_orig(orig_node,
batadv_frag_check_entry);
}
spin_unlock_bh(list_lock);
}
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 = to_delayed_work(work);
bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
batadv_purge_orig_ref(bat_priv);
queue_delayed_work(batadv_event_workqueue,
&bat_priv->orig_work,
msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD));
}
/**
* batadv_orig_dump() - Dump to netlink the originator infos for a specific
* outgoing interface
* @msg: message to dump into
* @cb: parameters for the dump
*
* Return: 0 or error value
*/
int batadv_orig_dump(struct sk_buff *msg, struct netlink_callback *cb)
{
struct net *net = sock_net(cb->skb->sk);
struct net_device *soft_iface;
struct net_device *hard_iface = NULL;
struct batadv_hard_iface *hardif = BATADV_IF_DEFAULT;
struct batadv_priv *bat_priv;
struct batadv_hard_iface *primary_if = NULL;
int ret;
int ifindex, hard_ifindex;
ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
if (!ifindex)
return -EINVAL;
soft_iface = dev_get_by_index(net, ifindex);
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
ret = -ENODEV;
goto out;
}
bat_priv = netdev_priv(soft_iface);
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
ret = -ENOENT;
goto out;
}
hard_ifindex = batadv_netlink_get_ifindex(cb->nlh,
BATADV_ATTR_HARD_IFINDEX);
if (hard_ifindex) {
hard_iface = dev_get_by_index(net, hard_ifindex);
if (hard_iface)
hardif = batadv_hardif_get_by_netdev(hard_iface);
if (!hardif) {
ret = -ENODEV;
goto out;
}
if (hardif->soft_iface != soft_iface) {
ret = -ENOENT;
goto out;
}
}
if (!bat_priv->algo_ops->orig.dump) {
ret = -EOPNOTSUPP;
goto out;
}
bat_priv->algo_ops->orig.dump(msg, cb, bat_priv, hardif);
ret = msg->len;
out:
batadv_hardif_put(hardif);
dev_put(hard_iface);
batadv_hardif_put(primary_if);
dev_put(soft_iface);
return ret;
}
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