lwip: Enable IPv6 stateless address autoconfiguration

components/esp_netif/include/esp_netif.h

@@ -613,6 +613,22 @@ esp_err_t esp_netif_create_ip6_linklocal(esp_netif_t *esp_netif);
  */
 esp_err_t esp_netif_get_ip6_linklocal(esp_netif_t *esp_netif, esp_ip6_addr_t *if_ip6);
 
+/**
+ * @brief  Get interface global IPv6 address
+ *
+ * If the specified interface is up and a preferred global IPv6 address
+ * has been created for the interface, return a copy of it.
+ *
+ * @param[in]  esp_netif Handle to esp-netif instance
+ * @param[out] if_ip6 IPv6 information will be returned in this argument if successful.
+ *
+ * @return
+ *      - ESP_OK
+ *      - ESP_FAIL If interface is down, does not have a global IPv6 address,
+ *        or the global IPv6 address is not a preferred address.
+ */
+esp_err_t esp_netif_get_ip6_global(esp_netif_t *esp_netif, esp_ip6_addr_t *if_ip6);
+
 /**
  * @brief Sets IPv4 address to the specified octets
  *

components/esp_netif/loopback/esp_netif_loopback.c

@@ -412,6 +412,11 @@ esp_err_t esp_netif_get_ip6_linklocal(esp_netif_t *esp_netif, esp_ip6_addr_t *if
     return ESP_ERR_NOT_SUPPORTED;
 }
 
+esp_err_t esp_netif_get_ip6_global(esp_netif_t *esp_netif, esp_ip6_addr_t *if_ip6)
+{
+    return ESP_ERR_NOT_SUPPORTED;
+}
+
 esp_netif_flags_t esp_netif_get_flags(esp_netif_t *esp_netif)
 {
     return esp_netif->flags;

components/esp_netif/lwip/esp_netif_lwip.c

@@ -1396,6 +1396,29 @@ esp_err_t esp_netif_get_ip6_linklocal(esp_netif_t *esp_netif, esp_ip6_addr_t *if
     return ESP_OK;
 }
 
+esp_err_t esp_netif_get_ip6_global(esp_netif_t *esp_netif, esp_ip6_addr_t *if_ip6)
+{
+    ESP_LOGD(TAG, "%s esp-netif:%p", __func__, esp_netif);
+
+    if (esp_netif == NULL || if_ip6 == NULL) {
+        return ESP_ERR_ESP_NETIF_INVALID_PARAMS;
+    }
+
+    int i;
+    struct netif *p_netif = esp_netif->lwip_netif;
+
+    if (p_netif != NULL && netif_is_up(p_netif)) {
+        for (i = 1; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
+            if (ip6_addr_ispreferred(netif_ip6_addr_state(p_netif, i))) {
+                memcpy(if_ip6, &p_netif->ip6_addr[i], sizeof(ip6_addr_t));
+                return ESP_OK;
+            }
+        }
+    }
+    
+    return ESP_FAIL;
+}
+
 esp_netif_flags_t esp_netif_get_flags(esp_netif_t *esp_netif)
 {
     return esp_netif->flags;

components/lwip/lwip

@@ -1 +1 @@
-Subproject commit b4eaf11fe5e980a2d9b655e6617d4163c11465ec
+Subproject commit 066ffe0abb83eee47808bf77c1bcfef51ad077fe

components/tcpip_adapter/include/tcpip_adapter.h

@@ -60,6 +60,15 @@ esp_err_t tcpip_adapter_get_ip_info(tcpip_adapter_if_t tcpip_if, tcpip_adapter_i
  */
 esp_err_t tcpip_adapter_get_ip6_linklocal(tcpip_adapter_if_t tcpip_if, ip6_addr_t *if_ip6);
 
+/**
+ * @brief Translates to esp_netif_get_ip6_global
+ *
+ * @param tcpip_if  Interface type corresponding to appropriate instance of esp-netif
+ * @param if_ip6 See esp_netif_get_ip6_global
+ * @return See esp_netif_get_ip6_global
+ */
+esp_err_t tcpip_adapter_get_ip6_global(tcpip_adapter_if_t tcpip_if, ip6_addr_t *if_ip6);
+
 /**
  * @brief`Translates to esp_netif_dhcpc_get_status
  * @param tcpip_if Interface type corresponding to appropriate instance of esp-netif

components/tcpip_adapter/tcpip_adapter_compat.c

@@ -200,6 +200,11 @@ esp_err_t tcpip_adapter_get_ip6_linklocal(tcpip_adapter_if_t tcpip_if, ip6_addr_
     return esp_netif_get_ip6_linklocal(netif_from_if(tcpip_if), (esp_ip6_addr_t*)if_ip6);
 }
 
+esp_err_t tcpip_adapter_get_ip6_global(tcpip_adapter_if_t tcpip_if, ip6_addr_t *if_ip6)
+{
+    return esp_netif_get_ip6_global(netif_from_if(tcpip_if), (esp_ip6_addr_t*)if_ip6);
+}
+
 esp_err_t tcpip_adapter_dhcpc_get_status(tcpip_adapter_if_t tcpip_if, tcpip_adapter_dhcp_status_t *status)
 {
     return esp_netif_dhcpc_get_status(netif_from_if(tcpip_if), status);