hostapd: Extend the configuration of RRM capabilities

Extend the radio_measurements parameter to save all the supported
RRM capabilities as it's used in RM enabled capabilities element.

Make this parameter not directly configurable via config file (though,
keep the radio_measurements parameter for some time for backwards
compatibility). Instead, add a configuration option to enable neighbor
report via radio measurements. Other features can be added later as
well.

Signed-off-by: David Spinadel <david.spinadel@intel.com>

hostapd/config_file.c

@@ -3321,7 +3321,15 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 		WPA_PUT_LE16(&bss->bss_load_test[3], atoi(pos));
 		bss->bss_load_test_set = 1;
 	} else if (os_strcmp(buf, "radio_measurements") == 0) {
-		bss->radio_measurements = atoi(pos);
+		/*
+		 * DEPRECATED: This parameter will be removed in the future.
+		 * Use rrm_neighbor_report instead.
+		 */
+		int val = atoi(pos);
+
+		if (val & BIT(0))
+			bss->radio_measurements[0] |=
+				WLAN_RRM_CAPS_NEIGHBOR_REPORT;
 	} else if (os_strcmp(buf, "own_ie_override") == 0) {
 		struct wpabuf *tmp;
 		size_t len = os_strlen(pos) / 2;
@@ -3468,6 +3476,10 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 	} else if (os_strcmp(buf, "civic") == 0) {
 		wpabuf_free(conf->civic);
 		conf->civic = wpabuf_parse_bin(pos);
+	} else if (os_strcmp(buf, "rrm_neighbor_report") == 0) {
+		if (atoi(pos))
+			bss->radio_measurements[0] |=
+				WLAN_RRM_CAPS_NEIGHBOR_REPORT;
 	} else {
 		wpa_printf(MSG_ERROR,
 			   "Line %d: unknown configuration item '%s'",

hostapd/hostapd.conf

@@ -1887,6 +1887,9 @@ own_ip_addr=127.0.0.1
 # The content of a location civic measurement subelement
 #civic=<Hexdump of binary data of the location civic report>
 
+# Enable neighbor report via radio measurements
+#rrm_neighbor_report=1
+
 ##### TESTING OPTIONS #########################################################
 #
 # The options in this section are only available when the build configuration

src/ap/ap_config.h

@@ -572,7 +572,7 @@ struct hostapd_bss_config {
 #define MESH_ENABLED BIT(0)
 	int mesh;
 
-	int radio_measurements;
+	u8 radio_measurements[RRM_CAPABILITIES_IE_LEN];
 
 	int vendor_vht;
 

src/ap/beacon.c

@@ -36,18 +36,21 @@
 static u8 * hostapd_eid_rm_enabled_capab(struct hostapd_data *hapd, u8 *eid,
 					 size_t len)
 {
-	if (!hapd->conf->radio_measurements || len < 2 + 4)
+	size_t i;
+
+	for (i = 0; i < RRM_CAPABILITIES_IE_LEN; i++) {
+		if (hapd->conf->radio_measurements[i])
+			break;
+	}
+
+	if (i == RRM_CAPABILITIES_IE_LEN || len < 2 + RRM_CAPABILITIES_IE_LEN)
 		return eid;
 
 	*eid++ = WLAN_EID_RRM_ENABLED_CAPABILITIES;
-	*eid++ = 5;
-	*eid++ = (hapd->conf->radio_measurements & BIT(0)) ?
-		WLAN_RRM_CAPS_NEIGHBOR_REPORT : 0x00;
-	*eid++ = 0x00;
-	*eid++ = 0x00;
-	*eid++ = 0x00;
-	*eid++ = 0x00;
-	return eid;
+	*eid++ = RRM_CAPABILITIES_IE_LEN;
+	os_memcpy(eid, hapd->conf->radio_measurements, RRM_CAPABILITIES_IE_LEN);
+
+	return eid + RRM_CAPABILITIES_IE_LEN;
 }
 
 

src/ap/ieee802_11.c

@@ -140,6 +140,7 @@ u16 hostapd_own_capab_info(struct hostapd_data *hapd)
 	int capab = WLAN_CAPABILITY_ESS;
 	int privacy;
 	int dfs;
+	int i;
 
 	/* Check if any of configured channels require DFS */
 	dfs = hostapd_is_dfs_required(hapd->iface);
@@ -187,8 +188,12 @@ u16 hostapd_own_capab_info(struct hostapd_data *hapd)
 	    (hapd->iconf->spectrum_mgmt_required || dfs))
 		capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 
-	if (hapd->conf->radio_measurements)
-		capab |= IEEE80211_CAP_RRM;
+	for (i = 0; i < RRM_CAPABILITIES_IE_LEN; i++) {
+		if (hapd->conf->radio_measurements[i]) {
+			capab |= IEEE80211_CAP_RRM;
+			break;
+		}
+	}
 
 	return capab;
 }

src/common/ieee802_11_defs.h

@@ -1504,6 +1504,8 @@ struct tpc_report {
 	u8 link_margin;
 } STRUCT_PACKED;
 
+#define RRM_CAPABILITIES_IE_LEN 5
+
 /* IEEE Std 802.11-2012, 8.5.7.4 - Link Measurement Request frame format */
 struct rrm_link_measurement_request {
 	u8 dialog_token;