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   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Fri, 18 Dec 2020 20:08:06 +0100
   3 Subject: [PATCH] mac80211: do not drop tx nulldata packets on encrypted links
   4
   5 ieee80211_tx_h_select_key drops any non-mgmt packets without a key when
   6 encryption is used. This is wrong for nulldata packets that can't be
   7 encrypted and are sent out for probing clients and indicating 4-address
   8 mode.
   9
  10 Reported-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
  11 Fixes: a0761a301746 ("mac80211: drop data frames without key on encrypted links")
  12 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  13 ---
  14
  15 --- a/net/mac80211/tx.c
  16 +++ b/net/mac80211/tx.c
  17 @@ -657,7 +657,7 @@ ieee80211_tx_h_select_key(struct ieee802
  18                 if (!skip_hw && tx->key &&
  19                     tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
  20                         info->control.hw_key = &tx->key->conf;
  21 -       } else if (!ieee80211_is_mgmt(hdr->frame_control) && tx->sta &&
  22 +       } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta &&
  23                    test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) {
  24                 return TX_DROP;
  25         }