feat(lwip/config): add menuconfig to enable ND6 RIO support and set the cache size

Author: DejinChen

components/lwip/Kconfig

@@ -949,6 +949,20 @@ menu "LWIP"
         help
             Maximum number of entries in IPv6 destinations cache
 
+    config LWIP_IPV6_ND6_ROUTE_INFO_OPTION_SUPPORT
+        bool "Enable IPV6 ND6 route information option support"
+        depends on LWIP_ND6
+        default n
+        help
+            Enable route information option (RIO) support in IPV6 ND6
+
+    config LWIP_IPV6_ND6_NUM_ROUTE_INFO
+        int "Max number of entries in IPv6 route information options cache"
+        depends on LWIP_IPV6_ND6_ROUTE_INFO_OPTION_SUPPORT
+        default 10
+        help
+            Maximum number of entries in IPv6 route information options cache
+
     menuconfig LWIP_PPP_SUPPORT
         bool "Enable PPP support"
         default n

components/lwip/lwip

@@ -1333,6 +1333,20 @@ static inline uint32_t timeout_from_offered(uint32_t lease, uint32_t min)
  */
 #define LWIP_IPV6_DUP_DETECT_ATTEMPTS   CONFIG_LWIP_IPV6_DUP_DETECT_ATTEMPTS
 
+/**
+ * LWIP_ND6_SUPPORT_RIO: Support route information options in IPv6 nd6 packets
+ */
+#ifdef CONFIG_LWIP_IPV6_ND6_ROUTE_INFO_OPTION_SUPPORT
+#define LWIP_ND6_SUPPORT_RIO            1
+#else
+#define LWIP_ND6_SUPPORT_RIO            0
+#endif
+
+/**
+ * LWIP_IPV6_ND6_NUM_ROUTE_INFO: Maximum number of entries in IPv6 route information options cache
+ */
+#define LWIP_ND6_NUM_ROUTES          CONFIG_LWIP_IPV6_ND6_NUM_ROUTE_INFO
+
 /*
    ---------------------------------------
    ---------- Hook options ---------------