VHT: Add option for requiring use of VHT

Signed-hostap: Mahesh Palivela <maheshp@posedge.com>

hostapd/config_file.c

@@ -2222,6 +2222,8 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 					   "vht_capab", line);
 				errors++;
 			}
+		} else if (os_strcmp(buf, "require_vht") == 0) {
+			conf->require_vht = atoi(pos);
 		} else if (os_strcmp(buf, "vht_oper_chwidth") == 0) {
 			conf->vht_oper_chwidth = atoi(pos);
 #endif /* CONFIG_IEEE80211AC */

hostapd/hostapd.conf

@@ -550,6 +550,9 @@ wmm_ac_vo_acm=0
 # 0 = Tx antenna pattern might change during the lifetime of an association
 # 1 = Tx antenna pattern does not change during the lifetime of an association
 #vht_capab=[SHORT-GI-80][HTC-VHT]
+#
+# Require stations to support VHT PHY (reject association if they do not)
+#require_vht=1
 
 # 0 = 20 or 40 MHz operating Channel width
 # 1 = 80 MHz channel width

src/ap/ap_config.h

@@ -476,6 +476,7 @@ struct hostapd_config {
 	int require_ht;
 	u32 vht_capab;
 	int ieee80211ac;
+	int require_vht;
 	u8 vht_oper_chwidth;
 };
 

src/ap/ieee802_11.c

@@ -653,6 +653,13 @@ static u16 check_assoc_ies(struct hostapd_data *hapd, struct sta_info *sta,
 				  elems.vht_capabilities_len);
 	if (resp != WLAN_STATUS_SUCCESS)
 		return resp;
+	if (hapd->iconf->ieee80211ac && hapd->iconf->require_vht &&
+	    !(sta->flags & WLAN_STA_VHT)) {
+		hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
+			       HOSTAPD_LEVEL_INFO, "Station does not support "
+			       "mandatory VHT PHY - reject association");
+		return WLAN_STATUS_UNSPECIFIED_FAILURE;
+	}
 #endif /* CONFIG_IEEE80211AC */
 
 	if ((hapd->conf->wpa & WPA_PROTO_RSN) && elems.rsn_ie) {