WNM: Provide option to disable/enable BTM support in STA

Add support to disable/enable BTM support using configuration and
wpa_cli command. This is useful mainly for testing purposes.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>

wpa_supplicant/config.c

@@ -4869,6 +4869,9 @@ static const struct global_parse_data global_fields[] = {
 	{ INT_RANGE(gas_rand_mac_addr, 0, 2), 0 },
 	{ INT_RANGE(dpp_config_processing, 0, 2), 0 },
 	{ INT_RANGE(coloc_intf_reporting, 0, 1), 0 },
+#ifdef CONFIG_WNM
+	{ INT_RANGE(disable_btm, 0, 1), CFG_CHANGED_DISABLE_BTM },
+#endif /* CONFIG_WNM */
 };
 
 #undef FUNC

wpa_supplicant/config.h

@@ -374,6 +374,7 @@ struct wpa_cred {
 #define CFG_CHANGED_P2P_PASSPHRASE_LEN BIT(16)
 #define CFG_CHANGED_SCHED_SCAN_PLANS BIT(17)
 #define CFG_CHANGED_WOWLAN_TRIGGERS BIT(18)
+#define CFG_CHANGED_DISABLE_BTM BIT(19)
 
 /**
  * struct wpa_config - wpa_supplicant configuration data
@@ -1527,6 +1528,15 @@ struct wpa_config {
 	 * By default, permanent MAC address is used.
 	 */
 	int p2p_interface_random_mac_addr;
+
+	/**
+	 * disable_btm - Disable BSS transition management in STA
+	 * - Set to 0 to enable BSS transition management
+	 * - Set to 1 to disable BSS transition management
+	 *
+	 * By default BSS transition management is enabled
+	 */
+	int disable_btm;
 };
 
 

wpa_supplicant/config_file.c

@@ -1545,6 +1545,8 @@ static void wpa_config_write_global(FILE *f, struct wpa_config *config)
 	if (config->p2p_interface_random_mac_addr)
 		fprintf(f, "p2p_interface_random_mac_addr=%d\n",
 			config->p2p_interface_random_mac_addr);
+	if (config->disable_btm)
+		fprintf(f, "disable_btm=1\n");
 }
 
 #endif /* CONFIG_NO_CONFIG_WRITE */

wpa_supplicant/wnm_sta.c

@@ -1371,6 +1371,9 @@ static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 	const u8 *vendor;
 #endif /* CONFIG_MBO */
 
+	if (wpa_s->conf->disable_btm)
+		return;
+
 	if (end - pos < 5)
 		return;
 

wpa_supplicant/wpa_supplicant.c

@@ -1711,7 +1711,8 @@ static void wpas_ext_capab_byte(struct wpa_supplicant *wpa_s, u8 *pos, int idx)
 	case 2: /* Bits 16-23 */
 #ifdef CONFIG_WNM
 		*pos |= 0x02; /* Bit 17 - WNM-Sleep Mode */
-		*pos |= 0x08; /* Bit 19 - BSS Transition */
+		if (!wpa_s->conf->disable_btm)
+			*pos |= 0x08; /* Bit 19 - BSS Transition */
 #endif /* CONFIG_WNM */
 		break;
 	case 3: /* Bits 24-31 */
@@ -6630,6 +6631,9 @@ void wpa_supplicant_update_config(struct wpa_supplicant *wpa_s)
 				   wpa_s->conf->wowlan_triggers);
 	}
 
+	if (wpa_s->conf->changed_parameters & CFG_CHANGED_DISABLE_BTM)
+		wpa_supplicant_set_default_scan_ies(wpa_s);
+
 #ifdef CONFIG_WPS
 	wpas_wps_update_config(wpa_s);
 #endif /* CONFIG_WPS */

wpa_supplicant/wpa_supplicant.conf

@@ -1516,6 +1516,12 @@ fast_reauth=1
 # Transitioning between states).
 #fst_llt=100
 
+# BSS Transition Management
+# disable_btm - Disable BSS transition management in STA
+# Set to 0 to enable BSS transition management (default behavior)
+# Set to 1 to disable BSS transition management
+#disable_btm=0
+
 # Example blocks:
 
 # Simple case: WPA-PSK, PSK as an ASCII passphrase, allow all valid ciphers