Merge branch android-tegra-3.10 into android-tegra-flounder-3.10

5dc2042 BACKPORT: nl80211: Stop scheduled scan if netlink client disappears
5586920 BACKPORT: cfg80211: allow userspace to take ownership of interfaces

Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 25561044
Change-Id: Id956f0aab1113a7f3df936c21cef48122b93f30b

5 files changed, 157 insertions, 1 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index b37be68bf9af..6cfc45d0f35f 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1306,6 +1306,8 @@ struct cfg80211_match_set {
  * @channels: channels to scan
  * @min_rssi_thold: for drivers only supporting a single threshold, this
  *	contains the minimum over all matchsets
+ * @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;
@@ -1324,6 +1326,7 @@ struct cfg80211_sched_scan_request {
 	struct wiphy *wiphy;
 	struct net_device *dev;
 	unsigned long scan_start;
+	u32 owner_nlportid;
 
 	/* keep last */
 	struct ieee80211_channel *channels[0];
@@ -2905,6 +2908,7 @@ struct cfg80211_cached_keys;
  * @p2p_started: true if this is a P2P Device that has been started
  * @cac_started: true if DFS channel availability check has been started
  * @cac_start_time: timestamp (jiffies) when the dfs state was entered.
+ * @owner_nlportid: (private) owner socket port ID
  */
 struct wireless_dev {
 	struct wiphy *wiphy;
@@ -2959,6 +2963,8 @@ struct wireless_dev {
 	bool cac_started;
 	unsigned long cac_start_time;
 
+	u32 owner_nlportid;
+
 #ifdef CONFIG_CFG80211_WEXT
 	/* wext data */
 	struct {
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 26be8db5fda5..cd1171b06b4b 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1502,6 +1502,30 @@ enum nl80211_commands {
  * @NL80211_ATTR_VENDOR_EVENTS: used for event list advertising in the wiphy
  *	info, containing a nested array of possible events
  *
+ * @NL80211_ATTR_QOS_MAP: IP DSCP mapping for Interworking QoS mapping. This
+ *	data is in the format defined for the payload of the QoS Map Set element
+ *	in IEEE Std 802.11-2012, 8.4.2.97.
+ *
+ * @NL80211_ATTR_MAC_HINT: MAC address recommendation as initial BSS
+ * @NL80211_ATTR_WIPHY_FREQ_HINT: frequency of the recommended initial BSS
+ *
+ * @NL80211_ATTR_MAX_AP_ASSOC_STA: Device attribute that indicates how many
+ *	associated stations are supported in AP mode (including P2P GO); u32.
+ *	Since drivers may not have a fixed limit on the maximum number (e.g.,
+ *	other concurrent operations may affect this), drivers are allowed to
+ *	advertise values that cannot always be met. In such cases, an attempt
+ *	to add a new station entry with @NL80211_CMD_NEW_STATION may fail.
+ *
+ * @NL80211_ATTR_TDLS_PEER_CAPABILITY: flags for TDLS peer capabilities, u32.
+ *	As specified in the &enum nl80211_tdls_peer_capability.
+ *
+ * @NL80211_ATTR_IFACE_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_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -1833,6 +1857,17 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_VENDOR_EVENTS,
 
+	NL80211_ATTR_QOS_MAP,
+
+	NL80211_ATTR_MAC_HINT,
+	NL80211_ATTR_WIPHY_FREQ_HINT,
+
+	NL80211_ATTR_MAX_AP_ASSOC_STA,
+
+	NL80211_ATTR_TDLS_PEER_CAPABILITY,
+
+	NL80211_ATTR_IFACE_SOCKET_OWNER,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 97accb853423..4d52d9e3db10 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -305,6 +305,59 @@ static void cfg80211_event_work(struct work_struct *work)
 	rtnl_unlock();
 }
 
+void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
+{
+	struct cfg80211_iface_destroy *item;
+
+	ASSERT_RTNL();
+
+	spin_lock_irq(&rdev->destroy_list_lock);
+	while ((item = list_first_entry_or_null(&rdev->destroy_list,
+						struct cfg80211_iface_destroy,
+						list))) {
+		struct wireless_dev *wdev, *tmp;
+		u32 nlportid = item->nlportid;
+
+		list_del(&item->list);
+		kfree(item);
+		spin_unlock_irq(&rdev->destroy_list_lock);
+
+		list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) {
+			if (nlportid == wdev->owner_nlportid)
+				rdev_del_virtual_intf(rdev, wdev);
+		}
+
+		spin_lock_irq(&rdev->destroy_list_lock);
+	}
+	spin_unlock_irq(&rdev->destroy_list_lock);
+}
+
+static void cfg80211_destroy_iface_wk(struct work_struct *work)
+{
+	struct cfg80211_registered_device *rdev;
+
+	rdev = container_of(work, struct cfg80211_registered_device,
+			    destroy_work);
+
+	rtnl_lock();
+	cfg80211_destroy_ifaces(rdev);
+	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(const struct cfg80211_ops *ops, int sizeof_priv)
@@ -368,6 +421,11 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 	rdev->wiphy.dev.class = &ieee80211_class;
 	rdev->wiphy.dev.platform_data = rdev;
 
+	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;
 #endif
@@ -740,6 +798,8 @@ void wiphy_unregister(struct wiphy *wiphy)
 	cancel_work_sync(&rdev->conn_work);
 	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);
 
 	if (rdev->wowlan && rdev->ops->set_wakeup)
 		rdev_set_wakeup(rdev, false);
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 15b4bb7ac046..2a7cd129f3b2 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -89,6 +89,12 @@ struct cfg80211_registered_device {
 	/* netlink port which started critical protocol (0 means not started) */
 	u32 crit_proto_nlportid;
 
+	spinlock_t destroy_list_lock;
+	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);
@@ -260,6 +266,13 @@ struct cfg80211_beacon_registration {
 	u32 nlportid;
 };
 
+struct cfg80211_iface_destroy {
+	struct list_head list;
+	u32 nlportid;
+};
+
+void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev);
+
 /* free object */
 extern void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
 
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 4ae5f2488e38..7e6113522a97 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -387,6 +387,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
 	[NL80211_ATTR_VENDOR_ID] = { .type = NLA_U32 },
 	[NL80211_ATTR_VENDOR_SUBCMD] = { .type = NLA_U32 },
 	[NL80211_ATTR_VENDOR_DATA] = { .type = NLA_BINARY },
+	[NL80211_ATTR_IFACE_SOCKET_OWNER] = { .type = NLA_FLAG },
 };
 
 /* policy for the key attributes */
@@ -2462,6 +2463,9 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
 	enum nl80211_iftype type = NL80211_IFTYPE_UNSPECIFIED;
 	u32 flags;
 
+	/* to avoid failing a new interface creation due to pending removal */
+	cfg80211_destroy_ifaces(rdev);
+
 	memset(&params, 0, sizeof(params));
 
 	if (!info->attrs[NL80211_ATTR_IFNAME])
@@ -2506,6 +2510,9 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
 		return PTR_ERR(wdev);
 	}
 
+	if (info->attrs[NL80211_ATTR_IFACE_SOCKET_OWNER])
+		wdev->owner_nlportid = info->snd_portid;
+
 	switch (type) {
 	case NL80211_IFTYPE_MESH_POINT:
 		if (!info->attrs[NL80211_ATTR_MESH_ID])
@@ -5602,6 +5609,9 @@ 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_IFACE_SOCKET_OWNER])
+			request->owner_nlportid = info->snd_portid;
+
 		rdev->sched_scan_req = request;
 		nl80211_send_sched_scan(rdev, dev,
 					NL80211_CMD_START_SCHED_SCAN);
@@ -10913,9 +10923,22 @@ static int nl80211_netlink_notify(struct notifier_block * nb,
 	rcu_read_lock();
 
 	list_for_each_entry_rcu(rdev, &cfg80211_rdev_list, list) {
-		list_for_each_entry_rcu(wdev, &rdev->wdev_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);
 
+			if (wdev->owner_nlportid == notify->portid)
+				schedule_destroy_work = true;
+		}
+
 		spin_lock_bh(&rdev->beacon_registrations_lock);
 		list_for_each_entry_safe(reg, tmp, &rdev->beacon_registrations,
 					 list) {
@@ -10926,6 +10949,25 @@ static int nl80211_netlink_notify(struct notifier_block * nb,
 			}
 		}
 		spin_unlock_bh(&rdev->beacon_registrations_lock);
+
+		if (schedule_destroy_work) {
+			struct cfg80211_iface_destroy *destroy;
+
+			destroy = kzalloc(sizeof(*destroy), GFP_ATOMIC);
+			if (destroy) {
+				destroy->nlportid = notify->portid;
+				spin_lock(&rdev->destroy_list_lock);
+				list_add(&destroy->list, &rdev->destroy_list);
+				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);
+		}
 	}
 
 	rcu_read_unlock();