Allow AP mode extended capabilities to be overridden

The new hostapd configuration parameters ext_capa_mask and ext_capa can
now be used to mask out or add extended capability bits. While this is
not without CONFIG_TESTING_OPTIONS, the main use case for this is for
testing purposes.

Signed-off-by: Jouni Malinen <j@w1.fi>

hostapd/config_file.c

@@ -2332,6 +2332,22 @@ fail:
 #endif /* CONFIG_DPP2 */
 
 
+static int get_hex_config(u8 *buf, size_t max_len, int line,
+			  const char *field, const char *val)
+{
+	size_t hlen = os_strlen(val), len = hlen / 2;
+	u8 tmp[EXT_CAPA_MAX_LEN];
+
+	os_memset(tmp, 0, EXT_CAPA_MAX_LEN);
+	if (hlen & 1 || len > EXT_CAPA_MAX_LEN || hexstr2bin(val, tmp, len)) {
+		wpa_printf(MSG_ERROR, "Line %d: Invalid %s", line, field);
+		return -1;
+	}
+	os_memcpy(buf, tmp, EXT_CAPA_MAX_LEN);
+	return 0;
+}
+
+
 static int hostapd_config_fill(struct hostapd_config *conf,
 			       struct hostapd_bss_config *bss,
 			       const char *buf, char *pos, int line)
@@ -4679,6 +4695,14 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 	} else if (os_strcmp(buf, "pasn_comeback_after") == 0) {
 		bss->pasn_comeback_after = atoi(pos);
 #endif /* CONFIG_PASN */
+	} else if (os_strcmp(buf, "ext_capa_mask") == 0) {
+		if (get_hex_config(bss->ext_capa_mask, EXT_CAPA_MAX_LEN,
+				   line, "ext_capa_mask", pos))
+			return 1;
+	} else if (os_strcmp(buf, "ext_capa") == 0) {
+		if (get_hex_config(bss->ext_capa, EXT_CAPA_MAX_LEN,
+				   line, "ext_capa", pos))
+			return 1;
 	} else {
 		wpa_printf(MSG_ERROR,
 			   "Line %d: unknown configuration item '%s'",

src/ap/ap_config.h

@@ -267,6 +267,8 @@ struct airtime_sta_weight {
 	u8 addr[ETH_ALEN];
 };
 
+#define EXT_CAPA_MAX_LEN 15
+
 /**
  * struct hostapd_bss_config - Per-BSS configuration
  */
@@ -889,6 +891,9 @@ struct hostapd_bss_config {
 #endif /* CONFIG_PASN */
 
 	unsigned int unsol_bcast_probe_resp_interval;
+
+	u8 ext_capa_mask[EXT_CAPA_MAX_LEN];
+	u8 ext_capa[EXT_CAPA_MAX_LEN];
 };
 
 /**

src/ap/ieee802_11_shared.c

@@ -451,7 +451,7 @@ static void hostapd_ext_capab_byte(struct hostapd_data *hapd, u8 *pos, int idx)
 u8 * hostapd_eid_ext_capab(struct hostapd_data *hapd, u8 *eid)
 {
 	u8 *pos = eid;
-	u8 len = 12, i;
+	u8 len = EXT_CAPA_MAX_LEN, i;
 
 	if (len < hapd->iface->extended_capa_len)
 		len = hapd->iface->extended_capa_len;
@@ -465,6 +465,11 @@ u8 * hostapd_eid_ext_capab(struct hostapd_data *hapd, u8 *eid)
 			*pos &= ~hapd->iface->extended_capa_mask[i];
 			*pos |= hapd->iface->extended_capa[i];
 		}
+
+		if (i < EXT_CAPA_MAX_LEN) {
+			*pos &= ~hapd->conf->ext_capa_mask[i];
+			*pos |= hapd->conf->ext_capa[i];
+		}
 	}
 
 	while (len > 0 && eid[1 + len] == 0) {