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From: Martin Kaistra <martin.kaistra@linutronix.de>
To: linux-wireless@vger.kernel.org
Cc: Jes Sorensen <Jes.Sorensen@gmail.com>,
	Kalle Valo <kvalo@kernel.org>,
	Ping-Ke Shih <pkshih@realtek.com>,
	Bitterblue Smith <rtl8821cerfe2@gmail.com>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: [PATCH] wifi: rtl8xxxu: enable MFP support
Date: Thu, 14 Mar 2024 17:48:50 +0100
Message-Id: <20240314164850.86432-1-martin.kaistra@linutronix.de>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

In order to connect to networks which require 802.11w, add the
MFP_CAPABLE flag and let mac80211 do the actual crypto in software.

When a robust management frames is received, rx_dec->swdec is not set,
even though the HW did not decrypt it. Extend the check and don't set
RX_FLAG_DECRYPTED for these frames in order to use SW decryption.

Signed-off-by: Martin Kaistra <martin.kaistra@linutronix.de>
---
 drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index 4a49f8f9d80f2..870bd952f5902 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -6473,7 +6473,9 @@ int rtl8xxxu_parse_rxdesc16(struct rtl8xxxu_priv *priv, struct sk_buff *skb)
 			rx_status->mactime = rx_desc->tsfl;
 			rx_status->flag |= RX_FLAG_MACTIME_START;
 
-			if (!rx_desc->swdec)
+			if (!rx_desc->swdec &&
+			    !(_ieee80211_is_robust_mgmt_frame(hdr) &&
+			      ieee80211_has_protected(hdr->frame_control)))
 				rx_status->flag |= RX_FLAG_DECRYPTED;
 			if (rx_desc->crc32)
 				rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
@@ -6578,7 +6580,9 @@ int rtl8xxxu_parse_rxdesc24(struct rtl8xxxu_priv *priv, struct sk_buff *skb)
 			rx_status->mactime = rx_desc->tsfl;
 			rx_status->flag |= RX_FLAG_MACTIME_START;
 
-			if (!rx_desc->swdec)
+			if (!rx_desc->swdec &&
+			    !(_ieee80211_is_robust_mgmt_frame(hdr) &&
+			      ieee80211_has_protected(hdr->frame_control)))
 				rx_status->flag |= RX_FLAG_DECRYPTED;
 			if (rx_desc->crc32)
 				rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
@@ -7998,6 +8002,7 @@ static int rtl8xxxu_probe(struct usb_interface *interface,
 	ieee80211_hw_set(hw, HAS_RATE_CONTROL);
 	ieee80211_hw_set(hw, SUPPORT_FAST_XMIT);
 	ieee80211_hw_set(hw, AMPDU_AGGREGATION);
+	ieee80211_hw_set(hw, MFP_CAPABLE);
 
 	wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);
 
-- 
2.39.2