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   1 From: Lorenzo Bianconi <lorenzo@kernel.org>
   2 Date: Tue, 16 Jul 2019 00:09:19 +0200
   3 Subject: [PATCH] mac80211: add IEEE80211_KEY_FLAG_GENERATE_MMIE to
   4  ieee80211_key_flags
   5
   6 Add IEEE80211_KEY_FLAG_GENERATE_MMIE flag to ieee80211_key_flags in order
   7 to allow the driver to notify mac80211 to generate MMIE and that it
   8 requires sequence number generation only.
   9 This is a preliminary patch to add BIP_CMAC_128 hw support to mt7615
  10 driver
  11
  12 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  13 Link: https://lore.kernel.org/r/dfe275f9aa0f1cc6b33085f9efd5d8447f68ad13.1563228405.git.lorenzo@kernel.org
  14 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  15 ---
  16
  17 --- a/include/net/mac80211.h
  18 +++ b/include/net/mac80211.h
  19 @@ -1702,6 +1702,9 @@ struct wireless_dev *ieee80211_vif_to_wd
  20   *     a TKIP key if it only requires MIC space. Do not set together with
  21   *     @IEEE80211_KEY_FLAG_GENERATE_MMIC on the same key.
  22   * @IEEE80211_KEY_FLAG_NO_AUTO_TX: Key needs explicit Tx activation.
  23 + * @IEEE80211_KEY_FLAG_GENERATE_MMIE: This flag should be set by the driver
  24 + *     for a AES_CMAC key to indicate that it requires sequence number
  25 + *     generation only
  26   */
  27  enum ieee80211_key_flags {
  28         IEEE80211_KEY_FLAG_GENERATE_IV_MGMT     = BIT(0),
  29 @@ -1714,6 +1717,7 @@ enum ieee80211_key_flags {
  30         IEEE80211_KEY_FLAG_RESERVE_TAILROOM     = BIT(7),
  31         IEEE80211_KEY_FLAG_PUT_MIC_SPACE        = BIT(8),
  32         IEEE80211_KEY_FLAG_NO_AUTO_TX           = BIT(9),
  33 +       IEEE80211_KEY_FLAG_GENERATE_MMIE        = BIT(10),
  34  };
  35
  36  /**
  37 --- a/net/mac80211/wpa.c
  38 +++ b/net/mac80211/wpa.c
  39 @@ -947,7 +947,8 @@ ieee80211_crypto_aes_cmac_encrypt(struct
  40
  41         info = IEEE80211_SKB_CB(skb);
  42
  43 -       if (info->control.hw_key)
  44 +       if (info->control.hw_key &&
  45 +           !(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIE))
  46                 return TX_CONTINUE;
  47
  48         if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
  49 @@ -963,6 +964,9 @@ ieee80211_crypto_aes_cmac_encrypt(struct
  50
  51         bip_ipn_set64(mmie->sequence_number, pn64);
  52
  53 +       if (info->control.hw_key)
  54 +               return TX_CONTINUE;
  55 +
  56         bip_aad(skb, aad);
  57
  58         /*