--- a/src/devices/wifi/mac-low.h	Wed Oct 24 15:05:17 2007 +0200
+++ b/src/devices/wifi/mac-low.h	Wed Oct 24 16:02:10 2007 +0200
@@ -194,6 +194,8 @@
   WifiMode GetDataTxMode (Mac48Address to, uint32_t size) const;
   WifiMode GetCtsTxModeForRts (Mac48Address to, WifiMode rtsTxMode) const;
   WifiMode GetAckTxModeForData (Mac48Address to, WifiMode dataTxMode) const;
+  Time GetCtsDuration (Mac48Address to, WifiMode rtsTxMode) const;
+  Time GetAckDuration (Mac48Address to, WifiMode dataTxMode) const;
   void NotifyNav (Time at, WifiMacHeader const*hdr);
   bool IsNavZero (Time at);
   void MaybeCancelPrevious (void);