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From:   Jouni Malinen <jouni@codeaurora.org>
To:     Johannes Berg <johannes@sipsolutions.net>
Cc:     linux-wireless@vger.kernel.org,
        Jouni Malinen <jouni@codeaurora.org>
Subject: [PATCH] mac80211: Handle special status codes in SAE commit
Date:   Fri, 31 Jul 2020 21:38:30 +0300
Message-Id: <20200731183830.18735-1-jouni@codeaurora.org>
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SAE authentication has been extended with H2E (IEEE 802.11 REVmd) and PK
(WFA) options. Those extensions use special status code values in the
SAE commit messages (Authentication frame with transaction sequence
number 1) to identify which extension is in use. mac80211 was
interpreting those new values as the AP denying authentication and that
resulted in failure to complete SAE authentication in some cases.

Fix this by adding exceptions for the new status code values 126 and
127.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
---
 include/linux/ieee80211.h | 2 ++
 net/mac80211/mlme.c       | 5 ++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 9f732499ea88..c47f43e65a2f 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -2561,6 +2561,8 @@ enum ieee80211_statuscode {
 	/* 802.11ai */
 	WLAN_STATUS_FILS_AUTHENTICATION_FAILURE = 108,
 	WLAN_STATUS_UNKNOWN_AUTHENTICATION_SERVER = 109,
+	WLAN_STATUS_SAE_HASH_TO_ELEMENT = 126,
+	WLAN_STATUS_SAE_PK = 127,
 };
 
 
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 839d0367446c..8b7ca8ddfe20 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2988,7 +2988,10 @@ static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
 		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
 
 		if (auth_alg == WLAN_AUTH_SAE &&
-		    status_code == WLAN_STATUS_ANTI_CLOG_REQUIRED)
+		    (status_code == WLAN_STATUS_ANTI_CLOG_REQUIRED ||
+		     (auth_transaction == 1 &&
+		      (status_code == WLAN_STATUS_SAE_HASH_TO_ELEMENT ||
+		       status_code == WLAN_STATUS_SAE_PK))))
 			return;
 
 		sdata_info(sdata, "%pM denied authentication (status %d)\n",
-- 
2.20.1