lwip: Enable IPv6 stateless address autoconfiguration

components/lwip/Kconfig

@@ -239,6 +239,14 @@ menu "LWIP"
             If rate limiting self-assignment requests, wait this long between
             each request.
 
+    config LWIP_IPV6_AUTOCONFIG
+        bool "Enable IPV6 stateless address autoconfiguration"
+        default n
+        help
+            Enabling this option allows the devices to IPV6 stateless address autoconfiguration.
+
+            See RFC 4862.
+
     menuconfig LWIP_NETIF_LOOPBACK
         bool "Support per-interface loopback"
         default y

components/lwip/lwip

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

components/lwip/port/esp32/include/lwipopts.h

@@ -757,7 +757,6 @@
 #define ESP_THREAD_SAFE_DEBUG           LWIP_DBG_OFF
 #define ESP_DHCP                        1
 #define ESP_DNS                         1
-#define ESP_IPV6_AUTOCONFIG             1
 #define ESP_PERF                        0
 #define ESP_RANDOM_TCP_PORT             1
 #define ESP_IP4_ATON                    1
@@ -781,6 +780,10 @@
 #define ESP_LWIP_SELECT                 1
 #define ESP_LWIP_LOCK                   1
 
+#ifdef CONFIG_LWIP_IPV6_AUTOCONFIG
+#define ESP_IPV6_AUTOCONFIG             CONFIG_LWIP_IPV6_AUTOCONFIG
+#endif
+
 #ifdef ESP_IRAM_ATTR
 #undef ESP_IRAM_ATTR
 #endif

components/tcpip_adapter/include/tcpip_adapter.h

@@ -439,6 +439,21 @@ esp_err_t tcpip_adapter_create_ip6_linklocal(tcpip_adapter_if_t tcpip_if);
  */
 esp_err_t tcpip_adapter_get_ip6_linklocal(tcpip_adapter_if_t tcpip_if, 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]  tcpip_if Interface to get global IPv6 address
+ * @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 tcpip_adapter_get_ip6_global(tcpip_adapter_if_t tcpip_if, ip6_addr_t *if_ip6);
+
 #if 0
 esp_err_t tcpip_adapter_get_mac(tcpip_adapter_if_t tcpip_if, uint8_t *mac);
 

components/tcpip_adapter/tcpip_adapter_lwip.c

@@ -553,6 +553,29 @@ esp_err_t tcpip_adapter_get_ip6_linklocal(tcpip_adapter_if_t tcpip_if, ip6_addr_
     return ESP_OK;
 }
 
+esp_err_t tcpip_adapter_get_ip6_global(tcpip_adapter_if_t tcpip_if, ip6_addr_t *if_ip6)
+{
+    ESP_LOGD(TAG, "%s esp-netif:%p", __func__, esp_netif);
+
+    if (tcpip_if >=TCPIP_ADAPTER_IF_MAX || if_ip6 == NULL) {
+        return ESP_ERR_TCPIP_ADAPTER_INVALID_PARAMS;
+    }
+
+    int i;
+    struct netif *p_netif = esp_netif[tcpip_if];
+
+    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;
+}
+
 #if 0
 esp_err_t tcpip_adapter_get_mac(tcpip_adapter_if_t tcpip_if, uint8_t mac[6])
 {