WNM: Add sending of BSS Transition Management Query

The new control interface command can be used to send a
BSS Transition Management Query frame to the current AP.

Signed-hostap: Vinayak Kamath <vkamat@codeaurora.org>

src/common/ieee802_11_defs.h

@@ -549,6 +549,14 @@ struct ieee80211_mgmt {
 					 * Entries (optional) */
 					u8 variable[0];
 				} STRUCT_PACKED bss_tm_resp;
+				struct {
+					u8 action; /* 6 */
+					u8 dialog_token;
+					u8 query_reason;
+					/* BSS Transition Candidate List
+					 * Entries (optional) */
+					u8 variable[0];
+				} STRUCT_PACKED bss_tm_query;
 			} u;
 		} STRUCT_PACKED action;
 	} u;

wpa_supplicant/ctrl_iface.c

@@ -4975,6 +4975,19 @@ static int wpas_ctrl_iface_wnm_sleep(struct wpa_supplicant *wpa_s, char *cmd)
 	return ret;
 }
 
+
+static int wpas_ctrl_iface_wnm_bss_query(struct wpa_supplicant *wpa_s, char *cmd)
+{
+	int query_reason;
+
+	query_reason = atoi(cmd);
+
+	wpa_printf(MSG_DEBUG, "CTRL_IFACE: WNM_BSS_QUERY query_reason=%d",
+		   query_reason);
+
+	return wnm_send_bss_transition_mgmt_query(wpa_s, query_reason);
+}
+
 #endif /* CONFIG_WNM */
 
 
@@ -5589,6 +5602,9 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
 	} else if (os_strncmp(buf, "WNM_SLEEP ", 10) == 0) {
 		if (wpas_ctrl_iface_wnm_sleep(wpa_s, buf + 10))
 			reply_len = -1;
+	} else if (os_strncmp(buf, "WNM_BSS_QUERY ", 10) == 0) {
+		if (wpas_ctrl_iface_wnm_bss_query(wpa_s, buf + 10))
+				reply_len = -1;
 #endif /* CONFIG_WNM */
 	} else if (os_strcmp(buf, "FLUSH") == 0) {
 		wpa_supplicant_ctrl_iface_flush(wpa_s);

wpa_supplicant/wnm_sta.c

@@ -681,6 +681,41 @@ static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 }
 
 
+int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
+				       u8 query_reason)
+{
+	u8 buf[1000], *pos;
+	struct ieee80211_mgmt *mgmt;
+	size_t len;
+	int ret;
+
+	wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
+		   MACSTR " query_reason=%u",
+		   MAC2STR(wpa_s->bssid), query_reason);
+
+	mgmt = (struct ieee80211_mgmt *) buf;
+	os_memset(&buf, 0, sizeof(buf));
+	os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
+	os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
+	os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
+	mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
+					   WLAN_FC_STYPE_ACTION);
+	mgmt->u.action.category = WLAN_ACTION_WNM;
+	mgmt->u.action.u.bss_tm_query.action = WNM_BSS_TRANS_MGMT_QUERY;
+	mgmt->u.action.u.bss_tm_query.dialog_token = 0;
+	mgmt->u.action.u.bss_tm_query.query_reason = query_reason;
+	pos = mgmt->u.action.u.bss_tm_query.variable;
+
+	len = pos - (u8 *) &mgmt->u.action.category;
+
+	ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
+				  wpa_s->own_addr, wpa_s->bssid,
+				  &mgmt->u.action.category, len, 0);
+
+	return ret;
+}
+
+
 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
 			      struct rx_action *action)
 {

wpa_supplicant/wnm_sta.h

@@ -83,6 +83,8 @@ void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
 void wnm_scan_response(struct wpa_supplicant *wpa_s,
 		       struct wpa_scan_results *scan_res);
 
+int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
+				       u8 query_reason);
 void wnm_deallocate_memory(struct wpa_supplicant *wpa_s);
 
 #endif /* WNM_STA_H */

wpa_supplicant/wpa_cli.c

@@ -2293,6 +2293,12 @@ static int wpa_cli_cmd_wnm_sleep(struct wpa_ctrl *ctrl, int argc, char *argv[])
 	return wpa_cli_cmd(ctrl, "WNM_SLEEP", 0, argc, argv);
 }
 
+
+static int wpa_cli_cmd_wnm_bss_query(struct wpa_ctrl *ctrl, int argc, char *argv[])
+{
+	return wpa_cli_cmd(ctrl, "WNM_BSS_QUERY", 1, argc, argv);
+}
+
 #endif /* CONFIG_WNM */
 
 
@@ -2754,6 +2760,8 @@ static struct wpa_cli_cmd wpa_cli_commands[] = {
 #ifdef CONFIG_WNM
 	{ "wnm_sleep", wpa_cli_cmd_wnm_sleep, NULL, cli_cmd_flag_none,
 	  "<enter/exit> [interval=#] = enter/exit WNM-Sleep mode" },
+	{ "wnm_bss_query", wpa_cli_cmd_wnm_bss_query, NULL, cli_cmd_flag_none,
+	  "<query reason> = Send BSS Transition Management Query" },
 #endif /* CONFIG_WNM */
 	{ "raw", wpa_cli_cmd_raw, NULL, cli_cmd_flag_sensitive,
 	  "<params..> = Sent unprocessed command" },