nl80211: Add SOCKET_OWNER support to JOIN_MESH

Signed-off-by: Denis Kenzior <denkenz@gmail.com>
[johannes: fix race with wdev lock/unlock by just acquiring once]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/uapi/linux/nl80211.h

@@ -1964,6 +1964,8 @@ enum nl80211_commands {
  *	station will deauthenticate when the socket is closed.
  *	If set during %NL80211_CMD_JOIN_IBSS the IBSS will be automatically
  *	torn down when the socket is closed.
+ *	If set during %NL80211_CMD_JOIN_MESH the mesh setup will be
+ *	automatically torn down when the socket is closed.
  *
  * @NL80211_ATTR_TDLS_INITIATOR: flag attribute indicating the current end is
  *	the TDLS link initiator.

net/wireless/core.h

@@ -303,10 +303,6 @@ int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 			 struct net_device *dev,
 			 struct mesh_setup *setup,
 			 const struct mesh_config *conf);
-int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
-		       struct net_device *dev,
-		       struct mesh_setup *setup,
-		       const struct mesh_config *conf);
 int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 			  struct net_device *dev);
 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,

net/wireless/mesh.c

@@ -217,21 +217,6 @@ int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 	return err;
 }
 
-int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
-		       struct net_device *dev,
-		       struct mesh_setup *setup,
-		       const struct mesh_config *conf)
-{
-	struct wireless_dev *wdev = dev->ieee80211_ptr;
-	int err;
-
-	wdev_lock(wdev);
-	err = __cfg80211_join_mesh(rdev, dev, setup, conf);
-	wdev_unlock(wdev);
-
-	return err;
-}
-
 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
 			      struct wireless_dev *wdev,
 			      struct cfg80211_chan_def *chandef)
@@ -286,6 +271,7 @@ int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 
 	err = rdev_leave_mesh(rdev, dev);
 	if (!err) {
+		wdev->conn_owner_nlportid = 0;
 		wdev->mesh_id_len = 0;
 		wdev->beacon_interval = 0;
 		memset(&wdev->chandef, 0, sizeof(wdev->chandef));

net/wireless/nl80211.c

@@ -10092,7 +10092,7 @@ static int nl80211_join_mesh(struct sk_buff *skb, struct genl_info *info)
 		if (err)
 			return err;
 	} else {
-		/* cfg80211_join_mesh() will sort it out */
+		/* __cfg80211_join_mesh() will sort it out */
 		setup.chandef.chan = NULL;
 	}
 
@@ -10130,7 +10130,13 @@ static int nl80211_join_mesh(struct sk_buff *skb, struct genl_info *info)
 	setup.userspace_handles_dfs =
 		nla_get_flag(info->attrs[NL80211_ATTR_HANDLE_DFS]);
 
-	return cfg80211_join_mesh(rdev, dev, &setup, &cfg);
+	wdev_lock(dev->ieee80211_ptr);
+	err = __cfg80211_join_mesh(rdev, dev, &setup, &cfg);
+	if (!err && info->attrs[NL80211_ATTR_SOCKET_OWNER])
+		dev->ieee80211_ptr->conn_owner_nlportid = info->snd_portid;
+	wdev_unlock(dev->ieee80211_ptr);
+
+	return err;
 }
 
 static int nl80211_leave_mesh(struct sk_buff *skb, struct genl_info *info)