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batman-adv: Allow to use rntl_link for device creation/deletion 

The sysfs configuration interface of batman-adv to add/remove soft-interfaces
is not deadlock free and doesn't follow the currently common way to create new
virtual interfaces.

An additional interface though rtnl_link is introduced which provides easy device
creation/deletion with tools like "ip":

$ ip link add dev bat0 type batadv
$ ip link del dev bat0

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
This commit is contained in:
Sven Eckelmann 2013-02-11 17:10:26 +08:00 committed by Antonio Quartulli
parent e07932ae6f
commit a4ac28c0d0
4 changed files with 33 additions and 0 deletions
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2
net/batman-adv/main.c
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@ -71,6 +71,7 @@ static int __init batadv_init(void)
batadv_debugfs_init();
register_netdevice_notifier(&batadv_hard_if_notifier);
rtnl_link_register(&batadv_link_ops);
pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
@ -81,6 +82,7 @@ static int __init batadv_init(void)
static void __exit batadv_exit(void)
{
batadv_debugfs_destroy();
rtnl_link_unregister(&batadv_link_ops);
unregister_netdevice_notifier(&batadv_hard_if_notifier);
batadv_hardif_remove_interfaces();

1
net/batman-adv/main.h
View File

@ -152,6 +152,7 @@ enum batadv_uev_type {
#include <linux/percpu.h>
#include <linux/slab.h>
#include <net/sock.h> /* struct sock */
#include <net/rtnetlink.h>
#include <linux/jiffies.h>
#include <linux/seq_file.h>
#include "types.h"

29
net/batman-adv/soft-interface.c
View File

@ -570,6 +570,8 @@ struct net_device *batadv_softif_create(const char *name)
if (!soft_iface)
return NULL;
soft_iface->rtnl_link_ops = &batadv_link_ops;
ret = register_netdevice(soft_iface);
if (ret < 0) {
pr_err("Unable to register the batman interface '%s': %i\n",
@ -592,6 +594,26 @@ void batadv_softif_destroy_sysfs(struct net_device *soft_iface)
queue_work(batadv_event_workqueue, &bat_priv->cleanup_work);
}
/**
* batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink
* @soft_iface: the to-be-removed batman-adv interface
* @head: list pointer
*/
static void batadv_softif_destroy_netlink(struct net_device *soft_iface,
struct list_head *head)
{
struct batadv_hard_iface *hard_iface;
list_for_each_entry(hard_iface, &batadv_hardif_list, list) {
if (hard_iface->soft_iface == soft_iface)
batadv_hardif_disable_interface(hard_iface,
BATADV_IF_CLEANUP_KEEP);
}
batadv_sysfs_del_meshif(soft_iface);
unregister_netdevice_queue(soft_iface, head);
}
int batadv_softif_is_valid(const struct net_device *net_dev)
{
if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx)
@ -600,6 +622,13 @@ int batadv_softif_is_valid(const struct net_device *net_dev)
return 0;
}
struct rtnl_link_ops batadv_link_ops __read_mostly = {
.kind = "batadv",
.priv_size = sizeof(struct batadv_priv),
.setup = batadv_softif_init_early,
.dellink = batadv_softif_destroy_netlink,
};
/* ethtool */
static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{

1
net/batman-adv/soft-interface.h
View File

@ -27,5 +27,6 @@ void batadv_interface_rx(struct net_device *soft_iface,
struct net_device *batadv_softif_create(const char *name);
void batadv_softif_destroy_sysfs(struct net_device *soft_iface);
int batadv_softif_is_valid(const struct net_device *net_dev);
extern struct rtnl_link_ops batadv_link_ops;
#endif /* _NET_BATMAN_ADV_SOFT_INTERFACE_H_ */