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[4/7] nl80211: ignore HT/VHT capabilities without QoS/WMM

Message ID 1426143210-25635-4-git-send-email-emmanuel.grumbach@intel.com
State Accepted
Delegated to: Johannes Berg
Headers show

Commit Message

Emmanuel Grumbach March 12, 2015, 6:53 a.m. UTC
From: Johannes Berg <johannes.berg@intel.com>

As HT/VHT depend heavily on QoS/WMM, it's not a good idea to
let userspace add clients that have HT/VHT but not QoS/WMM.
Since it does so in certain cases we've observed (client is
using HT IEs but not QoS/WMM) just ignore the HT/VHT info at
this point and don't pass it down to the drivers which might
unconditionally use it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
 net/wireless/nl80211.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
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diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index b020853..593513d 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4401,6 +4401,16 @@  static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info)
 	if (parse_station_flags(info, dev->ieee80211_ptr->iftype, &params))
 		return -EINVAL;
+	/* HT/VHT requires QoS, but if we don't have that just ignore HT/VHT
+	 * as userspace might just pass through the capabilities from the IEs
+	 * directly, rather than enforcing this restriction and returning an
+	 * error in this case.
+	 */
+	if (!(params.sta_flags_set & BIT(NL80211_STA_FLAG_WME))) {
+		params.ht_capa = NULL;
+		params.vht_capa = NULL;
+	}
 	/* When you run into this, adjust the code below for the new flag */