ath10k: fix protected flag stripping

This prevents protected flag being stripped from
undecrypted raw sniffed frames when monitor
interface is active.

Reported-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com>
Tested-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com>
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

1 files changed, 24 insertions, 9 deletions

diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c
index f744e355c70a..08b5718cdbf1 100644
--- a/drivers/net/wireless/ath/ath10k/htt_rx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -778,17 +778,30 @@ static void ath10k_htt_rx_h_rates(struct ath10k *ar,
 static void ath10k_htt_rx_h_protected(struct ath10k_htt *htt,
                                       struct ieee80211_rx_status *rx_status,
                                       struct sk_buff *skb,
-                                      enum htt_rx_mpdu_encrypt_type enctype)
+                                      enum htt_rx_mpdu_encrypt_type enctype,
+                                      enum rx_msdu_decap_format fmt,
+                                      bool dot11frag)
 {
         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 
+        rx_status->flag &= ~(RX_FLAG_DECRYPTED |
+                             RX_FLAG_IV_STRIPPED |
+                             RX_FLAG_MMIC_STRIPPED);
 
-        if (enctype == HTT_RX_MPDU_ENCRYPT_NONE) {
-                rx_status->flag &= ~(RX_FLAG_DECRYPTED |
-                                     RX_FLAG_IV_STRIPPED |
-                                     RX_FLAG_MMIC_STRIPPED);
+        if (enctype == HTT_RX_MPDU_ENCRYPT_NONE)
+                return;
+
+        /*
+         * There's no explicit rx descriptor flag to indicate whether a given
+         * frame has been decrypted or not. We're forced to use the decap
+         * format as an implicit indication. However fragmentation rx is always
+         * raw and it probably never reports undecrypted raws.
+         *
+         * This makes sure sniffed frames are reported as-is without stripping
+         * the protected flag.
+         */
+        if (fmt == RX_MSDU_DECAP_RAW && !dot11frag)
                 return;
-        }
 
         rx_status->flag |= RX_FLAG_DECRYPTED |
                            RX_FLAG_IV_STRIPPED |
@@ -942,7 +955,8 @@ static void ath10k_htt_rx_amsdu(struct ath10k_htt *htt,
                 }
 
                 skb_in = skb;
-                ath10k_htt_rx_h_protected(htt, rx_status, skb_in, enctype);
+                ath10k_htt_rx_h_protected(htt, rx_status, skb_in, enctype, fmt,
+                                          false);
                 skb = skb->next;
                 skb_in->next = NULL;
 
@@ -1024,7 +1038,7 @@ static void ath10k_htt_rx_msdu(struct ath10k_htt *htt,
                 break;
         }
 
-        ath10k_htt_rx_h_protected(htt, rx_status, skb, enctype);
+        ath10k_htt_rx_h_protected(htt, rx_status, skb, enctype, fmt, false);
 
         ath10k_process_rx(htt->ar, rx_status, skb);
 }
@@ -1330,7 +1344,8 @@ static void ath10k_htt_rx_frag_handler(struct ath10k_htt *htt,
 
         enctype = MS(__le32_to_cpu(rxd->mpdu_start.info0),
                      RX_MPDU_START_INFO0_ENCRYPT_TYPE);
-        ath10k_htt_rx_h_protected(htt, rx_status, msdu_head, enctype);
+        ath10k_htt_rx_h_protected(htt, rx_status, msdu_head, enctype, fmt,
+                                  true);
         msdu_head->ip_summed = ath10k_htt_rx_get_csum_state(msdu_head);
 
         if (tkip_mic_err)