[PATCH 1/3] mac80211: don't warn on AID field without top two MSBs set

[Luca Coelho <luca@coelho.fi>]

From: Johannes Berg <johannes.berg@intel.com>

While the change between 802.11-2012 and 802.11-2016 to move from
requiring APs to set the two top bits to now requiring them to be
cleared was apparently unintentional and will be fixed, clients
should either way assume that the top five bits are reserved and
ignore them.

Implement that in mac80211.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 net/mac80211/mlme.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 4c80e7896fa2..cc55ff8ae979 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2862,10 +2862,11 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
 	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
 	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
 
-	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
-		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
-			   aid);
-	aid &= ~(BIT(15) | BIT(14));
+	/*
+	 * The 5 MSB of the AID field are reserved
+	 * (802.11-2016 9.4.1.8 AID field)
+	 */
+	aid &= 0x7ff;
 
 	ifmgd->broken_ap = false;
 
-- 
2.15.0