nl80211: Stop scheduled scan if netlink client disappears
An attribute NL80211_ATTR_SOCKET_OWNER can be set by the scan initiator.
If present, the attribute will cause the scan to be stopped if the client
dies.
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 45d4d72..bd672ea 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1517,6 +1517,8 @@
* are 0 in the mask should be randomised, bits that are 1 should
* be taken from the @mac_addr
* @rcu_head: RCU callback used to free the struct
+ * @owner_nlportid: netlink portid of owner (if this should is a request
+ * owned by a particular socket)
*/
struct cfg80211_sched_scan_request {
struct cfg80211_ssid *ssids;
@@ -1539,6 +1541,7 @@
struct net_device *dev;
unsigned long scan_start;
struct rcu_head rcu_head;
+ u32 owner_nlportid;
/* keep last */
struct ieee80211_channel *channels[0];
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index b3ada0b..c0383e9 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1672,6 +1672,9 @@
* @NL80211_ATTR_SOCKET_OWNER: Flag attribute, if set during interface
* creation then the new interface will be owned by the netlink socket
* that created it and will be destroyed when the socket is closed.
+ * If set during scheduled scan start then the new scan req will be
+ * owned by the netlink socket that created it and the scheduled scan will
+ * be stopped when the socket is closed.
*
* @NL80211_ATTR_TDLS_INITIATOR: flag attribute indicating the current end is
* the TDLS link initiator.
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 0743449..456e4c3 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -321,6 +321,20 @@
rtnl_unlock();
}
+static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
+{
+ struct cfg80211_registered_device *rdev;
+
+ rdev = container_of(work, struct cfg80211_registered_device,
+ sched_scan_stop_wk);
+
+ rtnl_lock();
+
+ __cfg80211_stop_sched_scan(rdev, false);
+
+ rtnl_unlock();
+}
+
/* exported functions */
struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
@@ -407,6 +421,7 @@
INIT_LIST_HEAD(&rdev->destroy_list);
spin_lock_init(&rdev->destroy_list_lock);
INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
+ INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
#ifdef CONFIG_CFG80211_DEFAULT_PS
rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
@@ -787,6 +802,7 @@
flush_work(&rdev->event_work);
cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
flush_work(&rdev->destroy_work);
+ flush_work(&rdev->sched_scan_stop_wk);
#ifdef CONFIG_PM
if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
diff --git a/net/wireless/core.h b/net/wireless/core.h
index e82030c..801cd49 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -91,6 +91,8 @@
struct list_head destroy_list;
struct work_struct destroy_work;
+ struct work_struct sched_scan_stop_wk;
+
/* must be last because of the way we do wiphy_priv(),
* and it should at least be aligned to NETDEV_ALIGN */
struct wiphy wiphy __aligned(NETDEV_ALIGN);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index bacdf22f..7029201 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -6214,6 +6214,9 @@
sched_scan_req->dev = dev;
sched_scan_req->wiphy = &rdev->wiphy;
+ if (info->attrs[NL80211_ATTR_SOCKET_OWNER])
+ sched_scan_req->owner_nlportid = info->snd_portid;
+
rcu_assign_pointer(rdev->sched_scan_req, sched_scan_req);
nl80211_send_sched_scan(rdev, dev,
@@ -12618,6 +12621,13 @@
list_for_each_entry_rcu(rdev, &cfg80211_rdev_list, list) {
bool schedule_destroy_work = false;
+ bool schedule_scan_stop = false;
+ struct cfg80211_sched_scan_request *sched_scan_req =
+ rcu_dereference(rdev->sched_scan_req);
+
+ if (sched_scan_req && notify->portid &&
+ sched_scan_req->owner_nlportid == notify->portid)
+ schedule_scan_stop = true;
list_for_each_entry_rcu(wdev, &rdev->wdev_list, list) {
cfg80211_mlme_unregister_socket(wdev, notify->portid);
@@ -12648,6 +12658,12 @@
spin_unlock(&rdev->destroy_list_lock);
schedule_work(&rdev->destroy_work);
}
+ } else if (schedule_scan_stop) {
+ sched_scan_req->owner_nlportid = 0;
+
+ if (rdev->ops->sched_scan_stop &&
+ rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_SCHED_SCAN)
+ schedule_work(&rdev->sched_scan_stop_wk);
}
}