From: Antonio Quartulli antonio@open-mesh.com

Whenever the GW client mode is deselected, a DEL event has to be sent in order to tell userspace that the current gateway has been lost. Send the uevent on state change only if a gateway was currently selected.

Reported-by: Marek Lindner lindner_marek@yahoo.de Signed-off-by: Antonio Quartulli antonio@open-mesh.com ---

v2: - fixed typo - fixed kernel doc - fixed comment in sysfs.c

gateway_client.c | 27 +++++++++++++++++++++++++++ gateway_client.h | 1 + sysfs.c | 4 ++++ 3 files changed, 32 insertions(+)

diff --git a/gateway_client.c b/gateway_client.c index 588d27e..edf61da 100644 --- a/gateway_client.c +++ b/gateway_client.c @@ -188,6 +188,33 @@ next: return curr_gw; }

+/** + * batadv_gw_check_client_stop - check if client mode has been switched off + * @bat_priv: the bat priv with all the soft interface information + * + * This function assumes the caller has checked that the gw state *is actually + * changing*. This function is not supposed to be called when there is no state + * change. + */ +void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) +{ + struct batadv_gw_node *curr_gw; + + if (atomic_read(&bat_priv->gw_mode) != BATADV_GW_MODE_CLIENT) + return; + + curr_gw = batadv_gw_get_selected_gw_node(bat_priv); + if (!curr_gw) + return; + + /* if batman-adv is switching the gw client mode off and a gateway was + * already selected, send a DEL uevent + */ + batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); + + batadv_gw_node_free_ref(curr_gw); +} + void batadv_gw_election(struct batadv_priv *bat_priv) { struct batadv_gw_node *curr_gw = NULL, *next_gw = NULL; diff --git a/gateway_client.h b/gateway_client.h index 7ef955a..b235cbf 100644 --- a/gateway_client.h +++ b/gateway_client.h @@ -20,6 +20,7 @@ #ifndef _NET_BATMAN_ADV_GATEWAY_CLIENT_H_ #define _NET_BATMAN_ADV_GATEWAY_CLIENT_H_

+void batadv_gw_check_client_stop(struct batadv_priv *bat_priv); void batadv_gw_deselect(struct batadv_priv *bat_priv); void batadv_gw_election(struct batadv_priv *bat_priv); struct batadv_orig_node * diff --git a/sysfs.c b/sysfs.c index 6ec145d..096b511 100644 --- a/sysfs.c +++ b/sysfs.c @@ -409,6 +409,10 @@ static ssize_t batadv_store_gw_mode(struct kobject *kobj, curr_gw_mode_str, buff);

batadv_gw_deselect(bat_priv); + /* always call batadv_gw_check_client_stop() before changing the gateway + * state + */ + batadv_gw_check_client_stop(bat_priv); atomic_set(&bat_priv->gw_mode, (unsigned int)gw_mode_tmp); batadv_gw_tvlv_container_update(bat_priv); return count;