[PATCH v2] hostap: set ht_capab from wiphy when in P2P GO mode

[Arik Nemtsov]

Set the HT capabilities of a P2P GO according to the wiphy supported
ones. Mask-in a white-list of HT capabilities that won't cause problems
for non-supporting stations.

Signed-off-by: Arik Nemtsov <arik at wizery.com>
---
 wpa_supplicant/ap.c |   19 ++++++++++++++++---
 1 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/wpa_supplicant/ap.c b/wpa_supplicant/ap.c
index 9eb2ba6..3a20640 100644
--- a/wpa_supplicant/ap.c
+++ b/wpa_supplicant/ap.c
@@ -87,9 +87,10 @@ static int wpa_supplicant_conf_ap(struct wpa_supplicant *wpa_s,
 
 #ifdef CONFIG_IEEE80211N
 	/*
-	 * Enable HT20 if the driver supports it, by setting conf->ieee80211n.
+	 * Enable HT20 if the driver supports it, by setting conf->ieee80211n
+	 * and a mask of allowed capabilities within conf->ht_capab.
 	 * Using default config settings for: conf->ht_op_mode_fixed,
-	 * conf->ht_capab, conf->secondary_channel, conf->require_ht
+	 * conf->secondary_channel, conf->require_ht
 	 */
 	modes = wpa_drv_get_hw_feature_data(wpa_s, &num_modes, &flags);
 	if (modes) {
@@ -101,8 +102,20 @@ static int wpa_supplicant_conf_ap(struct wpa_supplicant *wpa_s,
 				break;
 			}
 		}
-		if (mode && mode->ht_capab)
+		if (mode && mode->ht_capab) {
 			conf->ieee80211n = 1;
+
+			/*
+			 * white-list capabilities that won't cause issues
+			 * to connecting stations.
+			 */
+			conf->ht_capab = mode->ht_capab &
+					 (HT_CAP_INFO_GREEN_FIELD |
+					 HT_CAP_INFO_SHORT_GI20MHZ |
+					 HT_CAP_INFO_SHORT_GI40MHZ |
+					 HT_CAP_INFO_RX_STBC_MASK |
+					 HT_CAP_INFO_MAX_AMSDU_SIZE);
+		}
 		ieee80211_sta_free_hw_features(modes, num_modes);
 		modes = NULL;
 	}
-- 
1.7.4.1