nl80211/cfg80211: extend mgmt-tx API for off-channel

With p2p, it is sometimes necessary to transmit
a frame (typically an action frame) on another
channel than the current channel. Enable this
through the CMD_FRAME API, and allow it to wait
for a response. A new command allows that wait
to be aborted.

However, allow userspace to specify whether or
not it wants to allow off-channel TX, it may
actually want to use the same channel only.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 6583cca..ee80ad8 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -341,9 +341,9 @@
 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev);
 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
 			  struct net_device *dev,
-			  struct ieee80211_channel *chan,
+			  struct ieee80211_channel *chan, bool offchan,
 			  enum nl80211_channel_type channel_type,
-			  bool channel_type_valid,
+			  bool channel_type_valid, unsigned int wait,
 			  const u8 *buf, size_t len, u64 *cookie);
 
 /* SME */