A new attribute NL80211_ATTR_SCAN_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@xxxxxxxxxxxxxxx>
---
include/net/cfg80211.h | 2 ++
include/uapi/linux/nl80211.h | 8 ++++++++
net/wireless/nl80211.c | 35 +++++++++++++++++++++++++++++++++++
3 files changed, 45 insertions(+)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 220d5f5..84378bf 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1512,6 +1512,8 @@ struct cfg80211_sched_scan_request {
struct wiphy *wiphy;
struct net_device *dev;
unsigned long scan_start;
+ u32 owner_nlportid;
+ struct work_struct sched_scan_stop_wk;
/* keep last */
struct ieee80211_channel *channels[0];
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 442369f..2731a04 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1669,6 +1669,11 @@ enum nl80211_commands {
* @NL80211_ATTR_SMPS_MODE: SMPS mode to use (ap mode). see
* &enum nl80211_smps_mode.
*
+ * @NL80211_ATTR_SCAN_SOCKET_OWNER: flag attribute, if set during scheduled
+ * scan start then the new scan req will be owned by the netlink socket
+ * that created it and the pending scan will be stopped when the socket
+ * is closed.
+ *
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
@@ -2021,6 +2026,8 @@ enum nl80211_attrs {
NL80211_ATTR_SMPS_MODE,
+ NL80211_ATTR_SCAN_SOCKET_OWNER,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@@ -2056,6 +2063,7 @@ enum nl80211_attrs {
#define NL80211_ATTR_KEY NL80211_ATTR_KEY
#define NL80211_ATTR_KEYS NL80211_ATTR_KEYS
#define NL80211_ATTR_FEATURE_FLAGS NL80211_ATTR_FEATURE_FLAGS
+#define NL80211_ATTR_SCAN_SOCKET_OWNER NL80211_ATTR_SCAN_SOCKET_OWNER
#define NL80211_MAX_SUPP_RATES 32
#define NL80211_MAX_SUPP_HT_RATES 77
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index d0a8361..653f649 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -395,6 +395,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
[NL80211_ATTR_USER_PRIO] = { .type = NLA_U8 },
[NL80211_ATTR_ADMITTED_TIME] = { .type = NLA_U16 },
[NL80211_ATTR_SMPS_MODE] = { .type = NLA_U8 },
+ [NL80211_ATTR_SCAN_SOCKET_OWNER] = { .type = NLA_FLAG },
};
/* policy for the key attributes */
@@ -5681,6 +5682,21 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
return err;
}
+static void nl80211_sched_scan_stop_wk(struct work_struct *work)
+{
+ struct cfg80211_sched_scan_request *req;
+ struct cfg80211_registered_device *rdev;
+
+ req = container_of(work, struct cfg80211_sched_scan_request,
+ sched_scan_stop_wk);
+
+ rdev = wiphy_to_rdev(req->wiphy);
+
+ rtnl_lock();
+ __cfg80211_stop_sched_scan(rdev, false);
+ rtnl_unlock();
+}
+
static int nl80211_start_sched_scan(struct sk_buff *skb,
struct genl_info *info)
{
@@ -5955,6 +5971,13 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
err = rdev_sched_scan_start(rdev, dev, request);
if (!err) {
+ if (info->attrs[NL80211_ATTR_SCAN_SOCKET_OWNER]) {
+ INIT_WORK(&request->sched_scan_stop_wk,
+ nl80211_sched_scan_stop_wk);
+
+ request->owner_nlportid = info->snd_portid;
+ }
+
rdev->sched_scan_req = request;
nl80211_send_sched_scan(rdev, dev,
NL80211_CMD_START_SCHED_SCAN);
@@ -12127,6 +12150,12 @@ 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 *req = rdev->sched_scan_req;
+
+ if (req && req->owner_nlportid == notify->portid &&
+ notify->portid)
+ schedule_scan_stop = true;
list_for_each_entry_rcu(wdev, &rdev->wdev_list, list) {
cfg80211_mlme_unregister_socket(wdev, notify->portid);
@@ -12157,6 +12186,12 @@ 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) {
+ req->owner_nlportid = 0;
+
+ if (rdev->ops->sched_scan_stop &&
+ rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_SCHED_SCAN)
+ schedule_work(&req->sched_scan_stop_wk);
}
}
--
1.8.3.1
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