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From: Miri Korenblit <miriam.rachel.korenblit@intel.com>
To: johannes@sipsolutions.net
Cc: linux-wireless@vger.kernel.org,
	Benjamin Berg <benjamin.berg@intel.com>,
	Johannes Berg <johannes.berg@intel.com>
Subject: [PATCH 02/15] wifi: cfg80211: parse all ML elements in an ML probe response
Date: Tue,  2 Jan 2024 21:35:31 +0200
Message-Id: <20240102213313.6635eb152735.I94289002d4a2f7b6b44dfa428344854e37b0b29c@changeid>
In-Reply-To: <20240102193544.157749-1-miriam.rachel.korenblit@intel.com>
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From: Benjamin Berg <benjamin.berg@intel.com>

A probe response from a transmitting AP in an Multi-BSSID setup will
contain more than one Multi-Link element. Most likely, only one of these
elements contains per-STA profiles.

Fixes: 2481b5da9c6b ("wifi: cfg80211: handle BSS data contained in ML probe responses")
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
---
 net/wireless/scan.c | 40 ++++++++++++++++++++++++++--------------
 1 file changed, 26 insertions(+), 14 deletions(-)

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 019208f6be77..42555753b947 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -2614,10 +2614,12 @@ cfg80211_tbtt_info_for_mld_ap(const u8 *ie, size_t ielen, u8 mld_id, u8 link_id,
 	return 0;
 }
 
-static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy,
-				       struct cfg80211_inform_single_bss_data *tx_data,
-				       struct cfg80211_bss *source_bss,
-				       gfp_t gfp)
+static void
+cfg80211_parse_ml_elem_sta_data(struct wiphy *wiphy,
+				struct cfg80211_inform_single_bss_data *tx_data,
+				struct cfg80211_bss *source_bss,
+				const struct element *elem,
+				gfp_t gfp)
 {
 	struct cfg80211_inform_single_bss_data data = {
 		.drv_data = tx_data->drv_data,
@@ -2626,7 +2628,6 @@ static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy,
 		.bss_source = BSS_SOURCE_STA_PROFILE,
 	};
 	struct ieee80211_multi_link_elem *ml_elem;
-	const struct element *elem;
 	struct cfg80211_mle *mle;
 	u16 control;
 	u8 ml_common_len;
@@ -2637,15 +2638,7 @@ static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy,
 	const u8 *pos;
 	u8 i;
 
-	if (!source_bss)
-		return;
-
-	if (tx_data->ftype != CFG80211_BSS_FTYPE_PRESP)
-		return;
-
-	elem = cfg80211_find_ext_elem(WLAN_EID_EXT_EHT_MULTI_LINK,
-				      tx_data->ie, tx_data->ielen);
-	if (!elem || !ieee80211_mle_size_ok(elem->data + 1, elem->datalen - 1))
+	if (!ieee80211_mle_size_ok(elem->data + 1, elem->datalen - 1))
 		return;
 
 	ml_elem = (void *)elem->data + 1;
@@ -2820,6 +2813,25 @@ static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy,
 	kfree(mle);
 }
 
+static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy,
+				       struct cfg80211_inform_single_bss_data *tx_data,
+				       struct cfg80211_bss *source_bss,
+				       gfp_t gfp)
+{
+	const struct element *elem;
+
+	if (!source_bss)
+		return;
+
+	if (tx_data->ftype != CFG80211_BSS_FTYPE_PRESP)
+		return;
+
+	for_each_element_extid(elem, WLAN_EID_EXT_EHT_MULTI_LINK,
+			       tx_data->ie, tx_data->ielen)
+		cfg80211_parse_ml_elem_sta_data(wiphy, tx_data, source_bss,
+						elem, gfp);
+}
+
 struct cfg80211_bss *
 cfg80211_inform_bss_data(struct wiphy *wiphy,
 			 struct cfg80211_inform_bss *data,
-- 
2.34.1