hostapd: Add require_ht configuration parameter

This can be used to configure hostapd to reject association with
any station that does not support HT PHY.

hostapd/config_file.c

@@ -1896,6 +1896,8 @@ struct hostapd_config * hostapd_config_read(const char *fname)
 					   "ht_capab", line);
 				errors++;
 			}
+		} else if (os_strcmp(buf, "require_ht") == 0) {
+			conf->require_ht = atoi(pos);
 #endif /* CONFIG_IEEE80211N */
 		} else if (os_strcmp(buf, "max_listen_interval") == 0) {
 			bss->max_listen_interval = atoi(pos);

hostapd/hostapd.conf

@@ -408,6 +408,9 @@ wmm_ac_vo_acm=0
 # L-SIG TXOP protection support: [LSIG-TXOP-PROT] (disabled if not set)
 #ht_capab=[HT40-][SHORT-GI-20][SHORT-GI-40]
 
+# Require stations to support HT PHY (reject association if they do not)
+#require_ht=1
+
 ##### IEEE 802.1X-2004 related configuration ##################################
 
 # Require IEEE 802.1X authorization

src/ap/ap_config.h

@@ -387,6 +387,7 @@ struct hostapd_config {
 	u16 ht_capab;
 	int ieee80211n;
 	int secondary_channel;
+	int require_ht;
 };
 
 

src/ap/hw_features.c

@@ -162,7 +162,8 @@ int hostapd_prepare_rates(struct hostapd_data *hapd,
 		hapd->iface->num_rates++;
 	}
 
-	if (hapd->iface->num_rates == 0 || num_basic_rates == 0) {
+	if ((hapd->iface->num_rates == 0 || num_basic_rates == 0) &&
+	    (!hapd->iconf->ieee80211n || !hapd->iconf->require_ht)) {
 		wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
 			   "rate sets (%d,%d).",
 			   hapd->iface->num_rates, num_basic_rates);

src/ap/ieee802_11.c

@@ -53,6 +53,8 @@ u8 * hostapd_eid_supp_rates(struct hostapd_data *hapd, u8 *eid)
 
 	*pos++ = WLAN_EID_SUPP_RATES;
 	num = hapd->iface->num_rates;
+	if (hapd->iconf->ieee80211n && hapd->iconf->require_ht)
+		num++;
 	if (num > 8) {
 		/* rest of the rates are encoded in Extended supported
 		 * rates element */
@@ -70,6 +72,10 @@ u8 * hostapd_eid_supp_rates(struct hostapd_data *hapd, u8 *eid)
 		pos++;
 	}
 
+	if (hapd->iconf->ieee80211n && hapd->iconf->require_ht &&
+	    hapd->iface->num_rates < 8)
+		*pos++ = 0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY;
+
 	return pos;
 }
 
@@ -83,6 +89,8 @@ u8 * hostapd_eid_ext_supp_rates(struct hostapd_data *hapd, u8 *eid)
 		return eid;
 
 	num = hapd->iface->num_rates;
+	if (hapd->iconf->ieee80211n && hapd->iconf->require_ht)
+		num++;
 	if (num <= 8)
 		return eid;
 	num -= 8;
@@ -101,6 +109,10 @@ u8 * hostapd_eid_ext_supp_rates(struct hostapd_data *hapd, u8 *eid)
 		pos++;
 	}
 
+	if (hapd->iconf->ieee80211n && hapd->iconf->require_ht &&
+	    hapd->iface->num_rates >= 8)
+		*pos++ = 0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY;
+
 	return pos;
 }
 
@@ -667,6 +679,13 @@ static u16 check_assoc_ies(struct hostapd_data *hapd, struct sta_info *sta,
 				 elems.ht_capabilities_len);
 	if (resp != WLAN_STATUS_SUCCESS)
 		return resp;
+	if (hapd->iconf->ieee80211n && hapd->iconf->require_ht &&
+	    !(sta->flags & WLAN_STA_HT)) {
+		hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
+			       HOSTAPD_LEVEL_INFO, "Station does not support "
+			       "mandatory HT PHY - reject association");
+		return WLAN_STATUS_ASSOC_DENIED_NO_HT;
+	}
 #endif /* CONFIG_IEEE80211N */
 
 	if ((hapd->conf->wpa & WPA_PROTO_RSN) && elems.rsn_ie) {

src/common/ieee802_11_defs.h

@@ -120,9 +120,10 @@
 #define WLAN_STATUS_SUPPORTED_CHANNEL_NOT_VALID 24
 /* IEEE 802.11g */
 #define WLAN_STATUS_ASSOC_DENIED_NO_SHORT_SLOT_TIME 25
-#define WLAN_STATUS_ASSOC_DENIED_NO_ER_PBCC 26
-#define WLAN_STATUS_ASSOC_DENIED_NO_DSSS_OFDM 27
+#define WLAN_STATUS_ASSOC_DENIED_NO_DSSS_OFDM 26
+#define WLAN_STATUS_ASSOC_DENIED_NO_HT 27
 #define WLAN_STATUS_R0KH_UNREACHABLE 28
+#define WLAN_STATUS_ASSOC_DENIED_NO_PCO 29
 /* IEEE 802.11w */
 #define WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY 30
 #define WLAN_STATUS_ROBUST_MGMT_FRAME_POLICY_VIOLATION 31
@@ -545,6 +546,7 @@ struct ieee80211_ht_operation {
 #define HT_INFO_STBC_PARAM_PCO_ACTIVE			((u16) BIT(10))
 #define HT_INFO_STBC_PARAM_PCO_PHASE			((u16) BIT(11))
 
+#define BSS_MEMBERSHIP_SELECTOR_HT_PHY 127
 
 #define OUI_MICROSOFT 0x0050f2 /* Microsoft (also used in Wi-Fi specs)
 				* 00:50:F2 */