mac80211: add IEEE80211_KEY_FLAG_GENERATE_MMIE to ieee80211_key_flags

Add IEEE80211_KEY_FLAG_GENERATE_MMIE flag to ieee80211_key_flags in order
to allow the driver to notify mac80211 to generate MMIE and that it
requires sequence number generation only.
This is a preliminary patch to add BIP_CMAC_128 hw support to mt7615
driver

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/dfe275f9aa0f1cc6b33085f9efd5d8447f68ad13.1563228405.git.lorenzo@kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 9 insertions, 1 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 6fe4381ba0ef..9effd286c1ae 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1704,6 +1704,9 @@ struct wireless_dev *ieee80211_vif_to_wdev(struct ieee80211_vif *vif);
  *      a TKIP key if it only requires MIC space. Do not set together with
  *      @IEEE80211_KEY_FLAG_GENERATE_MMIC on the same key.
  * @IEEE80211_KEY_FLAG_NO_AUTO_TX: Key needs explicit Tx activation.
+ * @IEEE80211_KEY_FLAG_GENERATE_MMIE: This flag should be set by the driver
+ *      for a AES_CMAC key to indicate that it requires sequence number
+ *      generation only
  */
 enum ieee80211_key_flags {
         IEEE80211_KEY_FLAG_GENERATE_IV_MGMT     = BIT(0),
@@ -1716,6 +1719,7 @@ enum ieee80211_key_flags {
         IEEE80211_KEY_FLAG_RESERVE_TAILROOM     = BIT(7),
         IEEE80211_KEY_FLAG_PUT_MIC_SPACE        = BIT(8),
         IEEE80211_KEY_FLAG_NO_AUTO_TX           = BIT(9),
+        IEEE80211_KEY_FLAG_GENERATE_MMIE        = BIT(10),
 };
 
 /**
diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index ee72779729e5..91bf32af55e9 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -946,7 +946,8 @@ ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
 
         info = IEEE80211_SKB_CB(skb);
 
-        if (info->control.hw_key)
+        if (info->control.hw_key &&
+            !(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIE))
                 return TX_CONTINUE;
 
         if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
@@ -962,6 +963,9 @@ ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
 
         bip_ipn_set64(mmie->sequence_number, pn64);
 
+        if (info->control.hw_key)
+                return TX_CONTINUE;
+
         bip_aad(skb, aad);
 
         /*