mac80211: allow drivers to access key sequence counter

In order to implement GTK rekeying, the device needs
to be able to encrypt frames with the right PN/IV and
check the PN/IV in RX frames. To be able to tell it
about all those counters, we need to be able to get
them from mac80211, this adds the required API.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/mac80211/key.h b/net/mac80211/key.h
index beb9c20ff48..86b216b0141 100644
--- a/net/mac80211/key.h
+++ b/net/mac80211/key.h
@@ -28,6 +28,7 @@
 #define CCMP_PN_LEN             6
 #define TKIP_IV_LEN             8
 #define TKIP_ICV_LEN            4
+#define CMAC_PN_LEN             6
 
 #define NUM_RX_DATA_QUEUES      16
 
@@ -89,13 +90,13 @@ struct ieee80211_key {
                          * frames and the last counter is used with Robust
                          * Management frames.
                          */
-                        u8 rx_pn[NUM_RX_DATA_QUEUES + 1][6];
+                        u8 rx_pn[NUM_RX_DATA_QUEUES + 1][CCMP_PN_LEN];
                         struct crypto_cipher *tfm;
                         u32 replays; /* dot11RSNAStatsCCMPReplays */
                 } ccmp;
                 struct {
                         atomic64_t tx_pn;
-                        u8 rx_pn[6];
+                        u8 rx_pn[CMAC_PN_LEN];
                         struct crypto_cipher *tfm;
                         u32 replays; /* dot11RSNAStatsCMACReplays */
                         u32 icverrors; /* dot11RSNAStatsCMACICVErrors */