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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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3
include/net/cfg80211.h
View File

@ -1517,6 +1517,8 @@ struct cfg80211_match_set {
* 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 cfg80211_sched_scan_request {
struct net_device *dev;
unsigned long scan_start;
struct rcu_head rcu_head;
u32 owner_nlportid;
/* keep last */
struct ieee80211_channel *channels[0];

3
include/uapi/linux/nl80211.h
View File

@ -1672,6 +1672,9 @@ enum nl80211_commands {
* @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.

16
net/wireless/core.c
View File

@ -321,6 +321,20 @@ static void cfg80211_destroy_iface_wk(struct work_struct *work)
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 @@ struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
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 @@ void wiphy_unregister(struct wiphy *wiphy)
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)

2
net/wireless/core.h
View File

@ -91,6 +91,8 @@ struct cfg80211_registered_device {
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);

16
net/wireless/nl80211.c
View File

@ -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);
}
}