feat(esp_wifi): Add improvements for privacy extension

1) Add support for MAC randomization in Active scan and connect
  2) Add support for randomizaton of sequence numbers
  3) Add support for randomization of dialog token for GAS frames

components/esp_wifi/Kconfig

@@ -925,6 +925,21 @@ menu "Wi-Fi"
                 Select this option to enable/disable support for station connections
                 to hidden APs using passive scan when the country policy is set to auto.
 
+        config ESP_WIFI_STA_RANDOM_MAC_ENABLED
+            bool "Station Mac-Randomization enabled"
+            default y
+            help
+                Select this option to enable Mac Randomization for Station
+
+        config ESP_WIFI_STA_RANDOM_MAC_AUTO_RESET_INTERVAL
+            int "Station Mac-Randomization Auto-Reset Interval time"
+            depends on ESP_WIFI_STA_RANDOM_MAC_ENABLED
+            range 1 24
+            default 12
+            help
+                Interval in hours to rotate the STA random MAC while not connected to an AP.
+                Values below 1 or above 24 are not allowed.
+
     endif # wifi enabled
 
 endmenu # Wi-Fi

components/esp_wifi/include/esp_wifi.h

@@ -120,6 +120,8 @@ typedef struct {
     int                    espnow_max_encrypt_num; /**< Maximum encrypt number of peers supported by espnow */
     int                    tx_hetb_queue_num;      /**< WiFi TX HE TB QUEUE number for STA HE TB PPDU transmission */
     bool                   dump_hesigb_enable;     /**< enable dump sigb field */
+    bool                   sta_random_mac;         /**< STA MAC randomization. Supported on station interface only; softAP may be added in future */
+    uint8_t                sta_rmac_auto_reset_int;/**< STA random MAC auto-reset interval in hours (1-24) while not connected */
     int                    magic;                  /**< WiFi init magic number, it should be the last field */
 } wifi_init_config_t;
 
@@ -347,6 +349,8 @@ extern wifi_osi_funcs_t g_wifi_osi_funcs;
     .espnow_max_encrypt_num = CONFIG_ESP_WIFI_ESPNOW_MAX_ENCRYPT_NUM, \
     .tx_hetb_queue_num = WIFI_TX_HETB_QUEUE_NUM, \
     .dump_hesigb_enable = WIFI_DUMP_HESIGB_ENABLED, \
+    .sta_random_mac = CONFIG_ESP_WIFI_STA_RANDOM_MAC_ENABLED, \
+    .sta_rmac_auto_reset_int = CONFIG_ESP_WIFI_STA_RANDOM_MAC_AUTO_RESET_INTERVAL, \
     .magic = WIFI_INIT_CONFIG_MAGIC\
 }
 

components/esp_wifi/remote/Kconfig.wifi.in

@@ -904,6 +904,21 @@ config WIFI_RMT_PASSIVE_HIDDEN_AP_SUPPORT
         Select this option to enable/disable support for station connections
         to hidden APs using passive scan when the country policy is set to auto.
 
+config WIFI_RMT_STA_RANDOM_MAC_ENABLED
+    bool "Station Mac-Randomization enabled"
+    default y
+    help
+        Select this option to enable Mac Randomization for Station
+
+config WIFI_RMT_STA_RANDOM_MAC_AUTO_RESET_INTERVAL
+    int "Station Mac-Randomization Auto-Reset Interval time"
+    depends on WIFI_RMT_STA_RANDOM_MAC_ENABLED
+    range 1 24
+    default 12
+    help
+        Interval in hours to rotate the STA random MAC while not connected to an AP.
+        Values below 1 or above 24 are not allowed.
+
 if !ESP_WIFI_ENABLED
     rsource "Kconfig.wifi_is_remote.in"
 endif # ESP_WIFI_ENABLED

components/esp_wifi/remote/Kconfig.wifi_is_remote.in

@@ -512,3 +512,14 @@ if WIFI_RMT_PASSIVE_HIDDEN_AP_SUPPORT
         bool
         default WIFI_RMT_PASSIVE_HIDDEN_AP_SUPPORT
 endif
+
+if WIFI_RMT_STA_RANDOM_MAC_ENABLED
+    config ESP_WIFI_STA_RANDOM_MAC_ENABLED # ignore: multiple-definition
+        bool
+        default WIFI_RMT_STA_RANDOM_MAC_ENABLED
+endif
+
+config ESP_WIFI_STA_RANDOM_MAC_AUTO_RESET_INTERVAL # ignore: multiple-definition
+    int
+    depends on WIFI_RMT_STA_RANDOM_MAC_ENABLED
+    default WIFI_RMT_STA_RANDOM_MAC_AUTO_RESET_INTERVAL

components/esp_wifi/remote/include/injected/esp_wifi.h

@@ -120,6 +120,8 @@ typedef struct {
     int                    espnow_max_encrypt_num; /**< Maximum encrypt number of peers supported by espnow */
     int                    tx_hetb_queue_num;      /**< WiFi TX HE TB QUEUE number for STA HE TB PPDU transmission */
     bool                   dump_hesigb_enable;     /**< enable dump sigb field */
+    bool                   sta_random_mac;         /**< STA MAC randomization. Supported on station interface only; softAP may be added in future */
+    uint8_t                sta_rmac_auto_reset_int;/**< STA random MAC auto-reset interval in hours (1-24) while not connected */
     int                    magic;                  /**< WiFi init magic number, it should be the last field */
 } wifi_init_config_t;
 
@@ -347,6 +349,8 @@ extern wifi_osi_funcs_t g_wifi_osi_funcs;
     .espnow_max_encrypt_num = CONFIG_WIFI_RMT_ESPNOW_MAX_ENCRYPT_NUM, \
     .tx_hetb_queue_num = WIFI_TX_HETB_QUEUE_NUM, \
     .dump_hesigb_enable = WIFI_DUMP_HESIGB_ENABLED, \
+    .sta_random_mac = CONFIG_WIFI_RMT_STA_RANDOM_MAC_ENABLED, \
+    .sta_rmac_auto_reset_int = CONFIG_WIFI_RMT_STA_RANDOM_MAC_AUTO_RESET_INTERVAL, \
     .magic = WIFI_INIT_CONFIG_MAGIC\
 }
 

components/esp_wifi/src/wifi_default.c

@@ -119,6 +119,13 @@ static void wifi_default_action_sta_connected(void *arg, esp_event_base_t base,
             }
         }
 
+#if CONFIG_ESP_WIFI_STA_RANDOM_MAC_ENABLED
+        /* Sync netif MAC when STA random MAC was set internally by the Wi-Fi driver */
+        uint8_t mac[6];
+        esp_wifi_get_mac(WIFI_IF_STA, mac);
+        esp_netif_set_mac(esp_netif, mac);
+#endif
+
         esp_netif_action_connected(s_wifi_netifs[WIFI_IF_STA], base, event_id, data);
     }
 }