Commit c6bda689 authored by Antonio Quartulli's avatar Antonio Quartulli Committed by Sven Eckelmann
Browse files

batman-adv: add wrapper function to throw uevent in userspace 



Using throw_uevent() is now possible to trigger uevent signal that can
be recognised in userspace. Uevents will be triggered through the
/devices/virtual/net/{MESH_IFACE} kobject.

A triggered uevent has three properties:
- type: the event class. Who generates the event (only 'gw' is currently
  defined). Corresponds to the BATTYPE uevent variable.
- action: the associated action with the event ('add'/'change'/'del' are
  currently defined). Corresponds to the BATACTION uevent variable.
- data: any useful data for the userspace. Corresponds to the BATDATA
  uevent variable.

Signed-off-by: default avatarAntonio Quartulli <ordex@autistici.org>
Signed-off-by: default avatarSven Eckelmann <sven@narfation.org>
parent 7683fdc1

net/batman-adv/bat_sysfs.c

+71 −0
Original line number Diff line number Diff line
@@ -40,6 +40,20 @@ static struct bat_priv *kobj_to_batpriv(struct kobject *obj) 
	return netdev_priv(net_dev);

}



#define UEV_TYPE_VAR	"BATTYPE="

#define UEV_ACTION_VAR	"BATACTION="

#define UEV_DATA_VAR	"BATDATA="



static char *uev_action_str[] = {

	"add",

	"del",

	"change"

};



static char *uev_type_str[] = {

	"gw"

};



/* Use this, if you have customized show and store functions */

#define BAT_ATTR(_name, _mode, _show, _store)	\

struct bat_attribute bat_attr_##_name = {	\
@@ -601,3 +615,60 @@ void sysfs_del_hardif(struct kobject **hardif_obj) 
	kobject_put(*hardif_obj);

	*hardif_obj = NULL;

}



int throw_uevent(struct bat_priv *bat_priv, enum uev_type type,

		 enum uev_action action, const char *data)

{

	int ret = -1;

	struct hard_iface *primary_if = NULL;

	struct kobject *bat_kobj;

	char *uevent_env[4] = { NULL, NULL, NULL, NULL };



	primary_if = primary_if_get_selected(bat_priv);

	if (!primary_if)

		goto out;



	bat_kobj = &primary_if->soft_iface->dev.kobj;



	uevent_env[0] = kmalloc(strlen(UEV_TYPE_VAR) +

				strlen(uev_type_str[type]) + 1,

				GFP_ATOMIC);

	if (!uevent_env[0])

		goto out;



	sprintf(uevent_env[0], "%s%s", UEV_TYPE_VAR, uev_type_str[type]);



	uevent_env[1] = kmalloc(strlen(UEV_ACTION_VAR) +

				strlen(uev_action_str[action]) + 1,

				GFP_ATOMIC);

	if (!uevent_env[1])

		goto out;



	sprintf(uevent_env[1], "%s%s", UEV_ACTION_VAR, uev_action_str[action]);



	/* If the event is DEL, ignore the data field */

	if (action != UEV_DEL) {

		uevent_env[2] = kmalloc(strlen(UEV_DATA_VAR) +

					strlen(data) + 1, GFP_ATOMIC);

		if (!uevent_env[2])

			goto out;



		sprintf(uevent_env[2], "%s%s", UEV_DATA_VAR, data);

	}



	ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);

out:

	kfree(uevent_env[0]);

	kfree(uevent_env[1]);

	kfree(uevent_env[2]);



	if (primary_if)

		hardif_free_ref(primary_if);



	if (ret)

		bat_dbg(DBG_BATMAN, bat_priv, "Impossible to send "

			"uevent for (%s,%s,%s) event (err: %d)\n",

			uev_type_str[type], uev_action_str[action],

			(action == UEV_DEL ? "NULL" : data), ret);

	return ret;

}

net/batman-adv/bat_sysfs.h

+2 −0
Original line number Diff line number Diff line
@@ -38,5 +38,7 @@ int sysfs_add_meshif(struct net_device *dev); 
void sysfs_del_meshif(struct net_device *dev);

int sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev);

void sysfs_del_hardif(struct kobject **hardif_obj);

int throw_uevent(struct bat_priv *bat_priv, enum uev_type type,

		 enum uev_action action, const char *data);



#endif /* _NET_BATMAN_ADV_SYSFS_H_ */

net/batman-adv/main.h

+11 −0
Original line number Diff line number Diff line
@@ -91,6 +91,17 @@ enum mesh_state { 
#define BCAST_QUEUE_LEN		256

#define BATMAN_QUEUE_LEN	256





enum uev_action {

	UEV_ADD = 0,

	UEV_DEL,

	UEV_CHANGE

};



enum uev_type {

	UEV_GW = 0

};



/*

 * Debug Messages

 */

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