[PATCH v2] rt2x00: Fix MMIC Countermeasures.

[Michael Skeffingfon]

From: Michael Skeffington <m...@astro.ai>

Set RX_FLAG_DECRYPTED in case of MMIC failure so that ieee80211_rx_h_decrypt() 
doesnt drop the frame before getting to ieee80211_rx_h_michael_mic_verify().

Signed-off-by: Michael Skeffington <m...@astro.ai>

---
 drivers/net/wireless/ralink/rt2x00/rt2800mmio.c | 13 +++++++++++--
 drivers/net/wireless/ralink/rt2x00/rt2800usb.c  | 15 ++++++++++++---
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c 
b/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c
index ee5276e233fa..ace91a2db756 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c
@@ -136,10 +136,19 @@ void rt2800mmio_fill_rxdone(struct queue_entry *entry,
                 */
                rxdesc->flags |= RX_FLAG_MMIC_STRIPPED;
 
-               if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS)
+               if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS) {
                        rxdesc->flags |= RX_FLAG_DECRYPTED;
-               else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC)
+        } else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC) {
+                       /*
+                        * In order to check the Michael Mic, the packet must 
have
+                        * been decrypted.  Mac80211 doesnt check the MMIC 
failure 
+                        * flag to initiate MMIC countermeasures if the decoded 
flag
+                        * has not been set.
+                        */
+                       rxdesc->flags |= RX_FLAG_DECRYPTED;
+
                        rxdesc->flags |= RX_FLAG_MMIC_ERROR;
+        }
        }
 
        if (rt2x00_get_field32(word, RXD_W3_MY_BSS))
diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800usb.c 
b/drivers/net/wireless/ralink/rt2x00/rt2800usb.c
index 685b8e0cd67d..7e5f397c37f9 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2800usb.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2800usb.c
@@ -697,11 +697,20 @@ static void rt2800usb_fill_rxdone(struct queue_entry 
*entry,
                 * stripped it from the frame. Signal this to mac80211.
                 */
                rxdesc->flags |= RX_FLAG_MMIC_STRIPPED;
-
-               if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS)
+        
+               if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS) {
+                       rxdesc->flags |= RX_FLAG_DECRYPTED;
+        } else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC) {
+                       /*
+                        * In order to check the Michael Mic, the packet must 
have
+                        * been decrypted.  Mac80211 doesnt check the MMIC 
failure 
+                        * flag to initiate MMIC countermeasures if the decoded 
flag
+                        * has not been set.
+                        */
                        rxdesc->flags |= RX_FLAG_DECRYPTED;
-               else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC)
+
                        rxdesc->flags |= RX_FLAG_MMIC_ERROR;
+        }
        }
 
        if (rt2x00_get_field32(word, RXD_W0_MY_BSS))
-- 
2.11.0