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nl80211: Stop scheduled scan if netlink client disappears

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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>
This commit is contained in:
Jukka Rissanen
2014-12-15 13:25:39 +02:00
committed by Johannes Berg
parent 31a60ed1e9
commit 93a1e86ce1
5 changed files with 40 additions and 0 deletions
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16
net/wireless/nl80211.c
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@@ -6214,6 +6214,9 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
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 @@ static int nl80211_netlink_notify(struct notifier_block * nb,
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 @@ static int nl80211_netlink_notify(struct notifier_block * nb,
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);
}
}