[15/21] iwlwifi: mvm: don't log un-decrypted frames

Commit Message

Luca Coelho Sept. 3, 2019, 7:37 a.m. UTC

From: Emmanuel Grumbach <[e-mail]>

Sometimes the firmware won't be able to decrypt frames
because the keys were not installed yet or other scenarios.
The firmware will soon stop dropping multicast frames when
MAC_FILTER_ACCEPT_GRP is not set. The firmware will simply
always pass multicast frame in.

In order to avoid logging any such frame coming in when we
don't have the keys, drop the print.

Signed-off-by: Emmanuel Grumbach <[e-mail]>
Signed-off-by: Luca Coelho <[e-mail]>
---
 drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index c48d6fb16408..77b03b757193 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -377,8 +377,16 @@  static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
 		stats->flag |= RX_FLAG_DECRYPTED;
 		return 0;
 	default:
-		/* Expected in monitor (not having the keys) */
-		if (!mvm->monitor_on)
+		/*
+		 * Sometimes we can get frames that were not decrypted
+		 * because the firmware didn't have the keys yet. This can
+		 * happen after connection where we can get multicast frames
+		 * before the GTK is installed.
+		 * Silently drop those frames.
+		 * Also drop un-decrypted frames in monitor mode.
+		 */
+		if (!is_multicast_ether_addr(hdr->addr1) &&
+		    !mvm->monitor_on && net_ratelimit())
 			IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
 	}