nl80211: Add support for mgmt_tx with random TA

This adds support for specifying a random TA for management frame
transmission commands and driver capability flags for indicating whether
this is supported in not-connected and connected states.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/drivers/driver.h

@@ -1393,6 +1393,10 @@ struct wpa_driver_capa {
 #define WPA_DRIVER_FLAGS_BEACON_RATE_HT		0x0000100000000000ULL
 /** Driver supports Beacon frame TX rate configuration (VHT rates) */
 #define WPA_DRIVER_FLAGS_BEACON_RATE_VHT	0x0000200000000000ULL
+/** Driver supports mgmt_tx with random TX address in non-connected state */
+#define WPA_DRIVER_FLAGS_MGMT_TX_RANDOM_TA	0x0000400000000000ULL
+/** Driver supports mgmt_tx with random TX addr in connected state */
+#define WPA_DRIVER_FLAGS_MGMT_TX_RANDOM_TA_CONNECTED	0x0000800000000000ULL
 	u64 flags;
 
 #define FULL_AP_CLIENT_STATE_SUPP(drv_flags) \
@@ -2785,6 +2789,9 @@ struct wpa_driver_ops {
 	 * transmitted on that channel; alternatively the frame may be sent on
 	 * the current operational channel (if in associated state in station
 	 * mode or while operating as an AP.)
+	 *
+	 * If @src differs from the device MAC address, use of a random
+	 * transmitter address is requested for this message exchange.
 	 */
 	int (*send_action)(void *priv, unsigned int freq, unsigned int wait,
 			   const u8 *dst, const u8 *src, const u8 *bssid,

src/drivers/driver_nl80211.c

@@ -6881,6 +6881,14 @@ static int wpa_driver_nl80211_send_action(struct i802_bss *bss,
 	os_memcpy(hdr->addr2, src, ETH_ALEN);
 	os_memcpy(hdr->addr3, bssid, ETH_ALEN);
 
+	if (os_memcmp(bss->addr, src, ETH_ALEN) != 0) {
+		wpa_printf(MSG_DEBUG, "nl80211: Use random TA " MACSTR,
+			   MAC2STR(src));
+		os_memcpy(bss->rand_addr, src, ETH_ALEN);
+	} else {
+		os_memset(bss->rand_addr, 0, ETH_ALEN);
+	}
+
 	if (is_ap_interface(drv->nlmode) &&
 	    (!(drv->capa.flags & WPA_DRIVER_FLAGS_OFFCHANNEL_TX) ||
 	     (int) freq == bss->freq || drv->device_ap_sme ||

src/drivers/driver_nl80211.h

@@ -78,6 +78,7 @@ struct i802_bss {
 
 	struct nl80211_wiphy_data *wiphy_data;
 	struct dl_list wiphy_list;
+	u8 rand_addr[ETH_ALEN];
 };
 
 struct wpa_driver_nl80211_data {

src/drivers/driver_nl80211_capa.c

@@ -389,6 +389,12 @@ static void wiphy_info_ext_feature_flags(struct wiphy_info_data *info,
 	    ext_feature_isset(ext_features, len,
 			      NL80211_EXT_FEATURE_SET_SCAN_DWELL))
 		capa->rrm_flags |= WPA_DRIVER_FLAGS_SUPPORT_BEACON_REPORT;
+	if (ext_feature_isset(ext_features, len,
+			      NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA))
+		capa->flags |= WPA_DRIVER_FLAGS_MGMT_TX_RANDOM_TA;
+	if (ext_feature_isset(ext_features, len,
+			      NL80211_EXT_FEATURE_MGMT_TX_RANDOM_TA_CONNECTED))
+		capa->flags |= WPA_DRIVER_FLAGS_MGMT_TX_RANDOM_TA_CONNECTED;
 }
 
 

src/drivers/driver_nl80211_event.c

@@ -860,6 +860,8 @@ static void mlme_event(struct i802_bss *bss,
 		   MAC2STR(data + 4 + ETH_ALEN));
 	if (cmd != NL80211_CMD_FRAME_TX_STATUS && !(data[4] & 0x01) &&
 	    os_memcmp(bss->addr, data + 4, ETH_ALEN) != 0 &&
+	    (is_zero_ether_addr(bss->rand_addr) ||
+	     os_memcmp(bss->rand_addr, data + 4, ETH_ALEN) != 0) &&
 	    os_memcmp(bss->addr, data + 4 + ETH_ALEN, ETH_ALEN) != 0) {
 		wpa_printf(MSG_MSGDUMP, "nl80211: %s: Ignore MLME frame event "
 			   "for foreign address", bss->ifname);