mac80211: support adding IV-room in the skb for CCMP keys

Some cards can generate CCMP IVs in HW, but require the space for the IV
to be pre-allocated in the frame at the correct offset. Add a key flag
that allows us to achieve this.

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index dc1123aa8181..f4e0ab49db20 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -901,6 +901,10 @@ static inline bool ieee80211_vif_is_mesh(struct ieee80211_vif *vif)
  * @IEEE80211_KEY_FLAG_SW_MGMT: This flag should be set by the driver for a
  *      CCMP key if it requires CCMP encryption of management frames (MFP) to
  *      be done in software.
+ * @IEEE80211_KEY_FLAG_PUT_IV_SPACE: This flag should be set by the driver
+ *      for a CCMP key if space should be prepared for the IV, but the IV
+ *      itself should not be generated. Do not set together with
+ *      @IEEE80211_KEY_FLAG_GENERATE_IV on the same key.
  */
 enum ieee80211_key_flags {
         IEEE80211_KEY_FLAG_WMM_STA      = 1<<0,
@@ -908,6 +912,7 @@ enum ieee80211_key_flags {
         IEEE80211_KEY_FLAG_GENERATE_MMIC= 1<<2,
         IEEE80211_KEY_FLAG_PAIRWISE     = 1<<3,
         IEEE80211_KEY_FLAG_SW_MGMT      = 1<<4,
+        IEEE80211_KEY_FLAG_PUT_IV_SPACE = 1<<5,
 };
 
 /**