Any virtual device created on top of a batman-adv mesh interface must be prevented to be used to create a new mesh network (this would lead to an unwanted batman-over-batman configuration) Signed-off-by: Antonio Quartulli <ordex@autistici.org>
631 lines
17 KiB
C
631 lines
17 KiB
C
/* Copyright (C) 2007-2012 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, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA
|
|
*/
|
|
|
|
#include "main.h"
|
|
#include "distributed-arp-table.h"
|
|
#include "hard-interface.h"
|
|
#include "soft-interface.h"
|
|
#include "send.h"
|
|
#include "translation-table.h"
|
|
#include "routing.h"
|
|
#include "sysfs.h"
|
|
#include "originator.h"
|
|
#include "hash.h"
|
|
#include "bridge_loop_avoidance.h"
|
|
|
|
#include <linux/if_arp.h>
|
|
|
|
void batadv_hardif_free_rcu(struct rcu_head *rcu)
|
|
{
|
|
struct batadv_hard_iface *hard_iface;
|
|
|
|
hard_iface = container_of(rcu, struct batadv_hard_iface, rcu);
|
|
dev_put(hard_iface->net_dev);
|
|
kfree(hard_iface);
|
|
}
|
|
|
|
struct batadv_hard_iface *
|
|
batadv_hardif_get_by_netdev(const struct net_device *net_dev)
|
|
{
|
|
struct batadv_hard_iface *hard_iface;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
|
|
if (hard_iface->net_dev == net_dev &&
|
|
atomic_inc_not_zero(&hard_iface->refcount))
|
|
goto out;
|
|
}
|
|
|
|
hard_iface = NULL;
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return hard_iface;
|
|
}
|
|
|
|
/**
|
|
* batadv_is_on_batman_iface - check if a device is a batman iface descendant
|
|
* @net_dev: the device to check
|
|
*
|
|
* If the user creates any virtual device on top of a batman-adv interface, it
|
|
* is important to prevent this new interface to be used to create a new mesh
|
|
* network (this behaviour would lead to a batman-over-batman configuration).
|
|
* This function recursively checks all the fathers of the device passed as
|
|
* argument looking for a batman-adv soft interface.
|
|
*
|
|
* Returns true if the device is descendant of a batman-adv mesh interface (or
|
|
* if it is a batman-adv interface itself), false otherwise
|
|
*/
|
|
static bool batadv_is_on_batman_iface(const struct net_device *net_dev)
|
|
{
|
|
struct net_device *parent_dev;
|
|
bool ret;
|
|
|
|
/* check if this is a batman-adv mesh interface */
|
|
if (batadv_softif_is_valid(net_dev))
|
|
return true;
|
|
|
|
/* no more parents..stop recursion */
|
|
if (net_dev->iflink == net_dev->ifindex)
|
|
return false;
|
|
|
|
/* recurse over the parent device */
|
|
parent_dev = dev_get_by_index(&init_net, net_dev->iflink);
|
|
/* if we got a NULL parent_dev there is something broken.. */
|
|
if (WARN(!parent_dev, "Cannot find parent device"))
|
|
return false;
|
|
|
|
ret = batadv_is_on_batman_iface(parent_dev);
|
|
|
|
if (parent_dev)
|
|
dev_put(parent_dev);
|
|
return ret;
|
|
}
|
|
|
|
static int batadv_is_valid_iface(const struct net_device *net_dev)
|
|
{
|
|
if (net_dev->flags & IFF_LOOPBACK)
|
|
return 0;
|
|
|
|
if (net_dev->type != ARPHRD_ETHER)
|
|
return 0;
|
|
|
|
if (net_dev->addr_len != ETH_ALEN)
|
|
return 0;
|
|
|
|
/* no batman over batman */
|
|
if (batadv_is_on_batman_iface(net_dev))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static struct batadv_hard_iface *
|
|
batadv_hardif_get_active(const struct net_device *soft_iface)
|
|
{
|
|
struct batadv_hard_iface *hard_iface;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
|
|
if (hard_iface->soft_iface != soft_iface)
|
|
continue;
|
|
|
|
if (hard_iface->if_status == BATADV_IF_ACTIVE &&
|
|
atomic_inc_not_zero(&hard_iface->refcount))
|
|
goto out;
|
|
}
|
|
|
|
hard_iface = NULL;
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return hard_iface;
|
|
}
|
|
|
|
static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *oldif)
|
|
{
|
|
struct batadv_vis_packet *vis_packet;
|
|
struct batadv_hard_iface *primary_if;
|
|
struct sk_buff *skb;
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
batadv_dat_init_own_addr(bat_priv, primary_if);
|
|
|
|
skb = bat_priv->vis.my_info->skb_packet;
|
|
vis_packet = (struct batadv_vis_packet *)skb->data;
|
|
memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN);
|
|
memcpy(vis_packet->sender_orig,
|
|
primary_if->net_dev->dev_addr, ETH_ALEN);
|
|
|
|
batadv_bla_update_orig_address(bat_priv, primary_if, oldif);
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
}
|
|
|
|
static void batadv_primary_if_select(struct batadv_priv *bat_priv,
|
|
struct batadv_hard_iface *new_hard_iface)
|
|
{
|
|
struct batadv_hard_iface *curr_hard_iface;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
|
|
new_hard_iface = NULL;
|
|
|
|
curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1);
|
|
rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
|
|
|
|
if (!new_hard_iface)
|
|
goto out;
|
|
|
|
bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
|
|
batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
|
|
|
|
out:
|
|
if (curr_hard_iface)
|
|
batadv_hardif_free_ref(curr_hard_iface);
|
|
}
|
|
|
|
static bool
|
|
batadv_hardif_is_iface_up(const struct batadv_hard_iface *hard_iface)
|
|
{
|
|
if (hard_iface->net_dev->flags & IFF_UP)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static void batadv_check_known_mac_addr(const struct net_device *net_dev)
|
|
{
|
|
const struct batadv_hard_iface *hard_iface;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
|
|
if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
|
|
(hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
|
|
continue;
|
|
|
|
if (hard_iface->net_dev == net_dev)
|
|
continue;
|
|
|
|
if (!batadv_compare_eth(hard_iface->net_dev->dev_addr,
|
|
net_dev->dev_addr))
|
|
continue;
|
|
|
|
pr_warn("The newly added mac address (%pM) already exists on: %s\n",
|
|
net_dev->dev_addr, hard_iface->net_dev->name);
|
|
pr_warn("It is strongly recommended to keep mac addresses unique to avoid problems!\n");
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
int batadv_hardif_min_mtu(struct net_device *soft_iface)
|
|
{
|
|
const struct batadv_priv *bat_priv = netdev_priv(soft_iface);
|
|
const struct batadv_hard_iface *hard_iface;
|
|
/* allow big frames if all devices are capable to do so
|
|
* (have MTU > 1500 + BAT_HEADER_LEN)
|
|
*/
|
|
int min_mtu = ETH_DATA_LEN;
|
|
|
|
if (atomic_read(&bat_priv->fragmentation))
|
|
goto out;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
|
|
if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
|
|
(hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
|
|
continue;
|
|
|
|
if (hard_iface->soft_iface != soft_iface)
|
|
continue;
|
|
|
|
min_mtu = min_t(int,
|
|
hard_iface->net_dev->mtu - BATADV_HEADER_LEN,
|
|
min_mtu);
|
|
}
|
|
rcu_read_unlock();
|
|
out:
|
|
return min_mtu;
|
|
}
|
|
|
|
/* adjusts the MTU if a new interface with a smaller MTU appeared. */
|
|
void batadv_update_min_mtu(struct net_device *soft_iface)
|
|
{
|
|
int min_mtu;
|
|
|
|
min_mtu = batadv_hardif_min_mtu(soft_iface);
|
|
if (soft_iface->mtu != min_mtu)
|
|
soft_iface->mtu = min_mtu;
|
|
}
|
|
|
|
static void
|
|
batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
struct batadv_priv *bat_priv;
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
|
|
if (hard_iface->if_status != BATADV_IF_INACTIVE)
|
|
goto out;
|
|
|
|
bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
|
|
bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
|
|
hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
|
|
|
|
/* the first active interface becomes our primary interface or
|
|
* the next active interface after the old primary interface was removed
|
|
*/
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
batadv_primary_if_select(bat_priv, hard_iface);
|
|
|
|
batadv_info(hard_iface->soft_iface, "Interface activated: %s\n",
|
|
hard_iface->net_dev->name);
|
|
|
|
batadv_update_min_mtu(hard_iface->soft_iface);
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
}
|
|
|
|
static void
|
|
batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
if ((hard_iface->if_status != BATADV_IF_ACTIVE) &&
|
|
(hard_iface->if_status != BATADV_IF_TO_BE_ACTIVATED))
|
|
return;
|
|
|
|
hard_iface->if_status = BATADV_IF_INACTIVE;
|
|
|
|
batadv_info(hard_iface->soft_iface, "Interface deactivated: %s\n",
|
|
hard_iface->net_dev->name);
|
|
|
|
batadv_update_min_mtu(hard_iface->soft_iface);
|
|
}
|
|
|
|
int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
|
|
const char *iface_name)
|
|
{
|
|
struct batadv_priv *bat_priv;
|
|
struct net_device *soft_iface;
|
|
__be16 ethertype = __constant_htons(BATADV_ETH_P_BATMAN);
|
|
int ret;
|
|
|
|
if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
|
|
goto out;
|
|
|
|
if (!atomic_inc_not_zero(&hard_iface->refcount))
|
|
goto out;
|
|
|
|
/* hard-interface is part of a bridge */
|
|
if (hard_iface->net_dev->priv_flags & IFF_BRIDGE_PORT)
|
|
pr_err("You are about to enable batman-adv on '%s' which already is part of a bridge. Unless you know exactly what you are doing this is probably wrong and won't work the way you think it would.\n",
|
|
hard_iface->net_dev->name);
|
|
|
|
soft_iface = dev_get_by_name(&init_net, iface_name);
|
|
|
|
if (!soft_iface) {
|
|
soft_iface = batadv_softif_create(iface_name);
|
|
|
|
if (!soft_iface) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
/* dev_get_by_name() increases the reference counter for us */
|
|
dev_hold(soft_iface);
|
|
}
|
|
|
|
if (!batadv_softif_is_valid(soft_iface)) {
|
|
pr_err("Can't create batman mesh interface %s: already exists as regular interface\n",
|
|
soft_iface->name);
|
|
ret = -EINVAL;
|
|
goto err_dev;
|
|
}
|
|
|
|
hard_iface->soft_iface = soft_iface;
|
|
bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
|
|
ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
|
|
if (ret < 0)
|
|
goto err_dev;
|
|
|
|
hard_iface->if_num = bat_priv->num_ifaces;
|
|
bat_priv->num_ifaces++;
|
|
hard_iface->if_status = BATADV_IF_INACTIVE;
|
|
ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
|
|
if (ret < 0) {
|
|
bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
|
|
bat_priv->num_ifaces--;
|
|
hard_iface->if_status = BATADV_IF_NOT_IN_USE;
|
|
goto err_dev;
|
|
}
|
|
|
|
hard_iface->batman_adv_ptype.type = ethertype;
|
|
hard_iface->batman_adv_ptype.func = batadv_batman_skb_recv;
|
|
hard_iface->batman_adv_ptype.dev = hard_iface->net_dev;
|
|
dev_add_pack(&hard_iface->batman_adv_ptype);
|
|
|
|
atomic_set(&hard_iface->frag_seqno, 1);
|
|
batadv_info(hard_iface->soft_iface, "Adding interface: %s\n",
|
|
hard_iface->net_dev->name);
|
|
|
|
if (atomic_read(&bat_priv->fragmentation) &&
|
|
hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
|
|
batadv_info(hard_iface->soft_iface,
|
|
"The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %zi would solve the problem.\n",
|
|
hard_iface->net_dev->name, hard_iface->net_dev->mtu,
|
|
ETH_DATA_LEN + BATADV_HEADER_LEN);
|
|
|
|
if (!atomic_read(&bat_priv->fragmentation) &&
|
|
hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
|
|
batadv_info(hard_iface->soft_iface,
|
|
"The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %zi.\n",
|
|
hard_iface->net_dev->name, hard_iface->net_dev->mtu,
|
|
ETH_DATA_LEN + BATADV_HEADER_LEN);
|
|
|
|
if (batadv_hardif_is_iface_up(hard_iface))
|
|
batadv_hardif_activate_interface(hard_iface);
|
|
else
|
|
batadv_err(hard_iface->soft_iface,
|
|
"Not using interface %s (retrying later): interface not active\n",
|
|
hard_iface->net_dev->name);
|
|
|
|
/* begin scheduling originator messages on that interface */
|
|
batadv_schedule_bat_ogm(hard_iface);
|
|
|
|
out:
|
|
return 0;
|
|
|
|
err_dev:
|
|
dev_put(soft_iface);
|
|
err:
|
|
batadv_hardif_free_ref(hard_iface);
|
|
return ret;
|
|
}
|
|
|
|
void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
|
|
if (hard_iface->if_status == BATADV_IF_ACTIVE)
|
|
batadv_hardif_deactivate_interface(hard_iface);
|
|
|
|
if (hard_iface->if_status != BATADV_IF_INACTIVE)
|
|
goto out;
|
|
|
|
batadv_info(hard_iface->soft_iface, "Removing interface: %s\n",
|
|
hard_iface->net_dev->name);
|
|
dev_remove_pack(&hard_iface->batman_adv_ptype);
|
|
|
|
bat_priv->num_ifaces--;
|
|
batadv_orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (hard_iface == primary_if) {
|
|
struct batadv_hard_iface *new_if;
|
|
|
|
new_if = batadv_hardif_get_active(hard_iface->soft_iface);
|
|
batadv_primary_if_select(bat_priv, new_if);
|
|
|
|
if (new_if)
|
|
batadv_hardif_free_ref(new_if);
|
|
}
|
|
|
|
bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
|
|
hard_iface->if_status = BATADV_IF_NOT_IN_USE;
|
|
|
|
/* delete all references to this hard_iface */
|
|
batadv_purge_orig_ref(bat_priv);
|
|
batadv_purge_outstanding_packets(bat_priv, hard_iface);
|
|
dev_put(hard_iface->soft_iface);
|
|
|
|
/* nobody uses this interface anymore */
|
|
if (!bat_priv->num_ifaces)
|
|
batadv_softif_destroy(hard_iface->soft_iface);
|
|
|
|
hard_iface->soft_iface = NULL;
|
|
batadv_hardif_free_ref(hard_iface);
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
}
|
|
|
|
static struct batadv_hard_iface *
|
|
batadv_hardif_add_interface(struct net_device *net_dev)
|
|
{
|
|
struct batadv_hard_iface *hard_iface;
|
|
int ret;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
ret = batadv_is_valid_iface(net_dev);
|
|
if (ret != 1)
|
|
goto out;
|
|
|
|
dev_hold(net_dev);
|
|
|
|
hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC);
|
|
if (!hard_iface)
|
|
goto release_dev;
|
|
|
|
ret = batadv_sysfs_add_hardif(&hard_iface->hardif_obj, net_dev);
|
|
if (ret)
|
|
goto free_if;
|
|
|
|
hard_iface->if_num = -1;
|
|
hard_iface->net_dev = net_dev;
|
|
hard_iface->soft_iface = NULL;
|
|
hard_iface->if_status = BATADV_IF_NOT_IN_USE;
|
|
INIT_LIST_HEAD(&hard_iface->list);
|
|
/* extra reference for return */
|
|
atomic_set(&hard_iface->refcount, 2);
|
|
|
|
batadv_check_known_mac_addr(hard_iface->net_dev);
|
|
list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
|
|
|
|
/* This can't be called via a bat_priv callback because
|
|
* we have no bat_priv yet.
|
|
*/
|
|
atomic_set(&hard_iface->bat_iv.ogm_seqno, 1);
|
|
hard_iface->bat_iv.ogm_buff = NULL;
|
|
|
|
return hard_iface;
|
|
|
|
free_if:
|
|
kfree(hard_iface);
|
|
release_dev:
|
|
dev_put(net_dev);
|
|
out:
|
|
return NULL;
|
|
}
|
|
|
|
static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
/* first deactivate interface */
|
|
if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
|
|
batadv_hardif_disable_interface(hard_iface);
|
|
|
|
if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
|
|
return;
|
|
|
|
hard_iface->if_status = BATADV_IF_TO_BE_REMOVED;
|
|
batadv_sysfs_del_hardif(&hard_iface->hardif_obj);
|
|
batadv_hardif_free_ref(hard_iface);
|
|
}
|
|
|
|
void batadv_hardif_remove_interfaces(void)
|
|
{
|
|
struct batadv_hard_iface *hard_iface, *hard_iface_tmp;
|
|
|
|
rtnl_lock();
|
|
list_for_each_entry_safe(hard_iface, hard_iface_tmp,
|
|
&batadv_hardif_list, list) {
|
|
list_del_rcu(&hard_iface->list);
|
|
batadv_hardif_remove_interface(hard_iface);
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static int batadv_hard_if_event(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *net_dev = ptr;
|
|
struct batadv_hard_iface *hard_iface;
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
struct batadv_priv *bat_priv;
|
|
|
|
hard_iface = batadv_hardif_get_by_netdev(net_dev);
|
|
if (!hard_iface && event == NETDEV_REGISTER)
|
|
hard_iface = batadv_hardif_add_interface(net_dev);
|
|
|
|
if (!hard_iface)
|
|
goto out;
|
|
|
|
switch (event) {
|
|
case NETDEV_UP:
|
|
batadv_hardif_activate_interface(hard_iface);
|
|
break;
|
|
case NETDEV_GOING_DOWN:
|
|
case NETDEV_DOWN:
|
|
batadv_hardif_deactivate_interface(hard_iface);
|
|
break;
|
|
case NETDEV_UNREGISTER:
|
|
list_del_rcu(&hard_iface->list);
|
|
|
|
batadv_hardif_remove_interface(hard_iface);
|
|
break;
|
|
case NETDEV_CHANGEMTU:
|
|
if (hard_iface->soft_iface)
|
|
batadv_update_min_mtu(hard_iface->soft_iface);
|
|
break;
|
|
case NETDEV_CHANGEADDR:
|
|
if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
|
|
goto hardif_put;
|
|
|
|
batadv_check_known_mac_addr(hard_iface->net_dev);
|
|
|
|
bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto hardif_put;
|
|
|
|
if (hard_iface == primary_if)
|
|
batadv_primary_if_update_addr(bat_priv, NULL);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
hardif_put:
|
|
batadv_hardif_free_ref(hard_iface);
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
/* This function returns true if the interface represented by ifindex is a
|
|
* 802.11 wireless device
|
|
*/
|
|
bool batadv_is_wifi_iface(int ifindex)
|
|
{
|
|
struct net_device *net_device = NULL;
|
|
bool ret = false;
|
|
|
|
if (ifindex == BATADV_NULL_IFINDEX)
|
|
goto out;
|
|
|
|
net_device = dev_get_by_index(&init_net, ifindex);
|
|
if (!net_device)
|
|
goto out;
|
|
|
|
#ifdef CONFIG_WIRELESS_EXT
|
|
/* pre-cfg80211 drivers have to implement WEXT, so it is possible to
|
|
* check for wireless_handlers != NULL
|
|
*/
|
|
if (net_device->wireless_handlers)
|
|
ret = true;
|
|
else
|
|
#endif
|
|
/* cfg80211 drivers have to set ieee80211_ptr */
|
|
if (net_device->ieee80211_ptr)
|
|
ret = true;
|
|
out:
|
|
if (net_device)
|
|
dev_put(net_device);
|
|
return ret;
|
|
}
|
|
|
|
struct notifier_block batadv_hard_if_notifier = {
|
|
.notifier_call = batadv_hard_if_event,
|
|
};
|