cfg80211/mac80211: allow any interface to send channel switch notifications

For multi-vif channel switches, we want to send
NL80211_CMD_CH_SWITCH_NOTIFY to the userspace to let it decide whether
other interfaces need to be moved as well.  This is needed when we
want a P2P GO interface to follow the channel of a station, for
example.

Modify the code so that all interfaces can send CSA notifications.
Additionally, send notifications for STA CSA as well.

Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 3541634..a552736 100644 (file)
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -643,7 +643,9 @@
  * @NL80211_CMD_CH_SWITCH_NOTIFY: An AP or GO may decide to switch channels
  *     independently of the userspace SME, send this event indicating
  *     %NL80211_ATTR_IFINDEX is now on %NL80211_ATTR_WIPHY_FREQ and the
- *     attributes determining channel width.
+ *     attributes determining channel width.  This indication may also be
+ *     sent when a remotely-initiated switch (e.g., when a STA receives a CSA
+ *     from the remote AP) is completed;
  *
  * @NL80211_CMD_CH_SWITCH_STARTED_NOTIFY: Notify that a channel switch
  *     has been started on an interface, regardless of the initiator

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 9472500..2435398 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1049,6 +1049,8 @@ static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
                sdata->csa_block_tx = false;
        }
 
+       cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
+
        sdata->vif.csa_active = false;
        ifmgd->csa_waiting_bcn = false;
 

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 24fd292..d0a8361 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -11702,12 +11702,6 @@ void cfg80211_ch_switch_notify(struct net_device *dev,
 
        trace_cfg80211_ch_switch_notify(dev, chandef);
 
-       if (WARN_ON(wdev->iftype != NL80211_IFTYPE_AP &&
-                   wdev->iftype != NL80211_IFTYPE_P2P_GO &&
-                   wdev->iftype != NL80211_IFTYPE_ADHOC &&
-                   wdev->iftype != NL80211_IFTYPE_MESH_POINT))
-               return;
-
        wdev->chandef = *chandef;
        wdev->preset_chandef = *chandef;
        nl80211_ch_switch_notify(rdev, dev, chandef, GFP_KERNEL,