fix bug for ipv6 fragment

Author: freakyxue

components/lwip/Kconfig

@@ -123,18 +123,31 @@ menu "LWIP"
             Enabling this option allows checking for the destination address
             of a received IPv4 Packet.
 
-    config LWIP_IP_FRAG
-        bool "Enable fragment outgoing IP packets"
+    config LWIP_IP4_FRAG
+        bool "Enable fragment outgoing IP4 packets"
         default y
         help
-            Enabling this option allows fragmenting outgoing IP packets if their size
+            Enabling this option allows fragmenting outgoing IP4 packets if their size
             exceeds MTU.
 
-    config LWIP_IP_REASSEMBLY
-        bool "Enable reassembly incoming fragmented IP packets"
+    config LWIP_IP6_FRAG
+        bool "Enable fragment outgoing IP6 packets"
+        default y
+        help
+            Enabling this option allows fragmenting outgoing IP6 packets if their size
+            exceeds MTU.
+
+    config LWIP_IP4_REASSEMBLY
+        bool "Enable reassembly incoming fragmented IP4 packets"
+        default n
+        help
+            Enabling this option allows reassemblying incoming fragmented IP4 packets.
+
+    config LWIP_IP6_REASSEMBLY
+        bool "Enable reassembly incoming fragmented IP6 packets"
         default n
         help
-            Enabling this option allows reassemblying incoming fragmented IP packets.
+            Enabling this option allows reassemblying incoming fragmented IP6 packets.
 
     config LWIP_IP_FORWARD
         bool "Enable IP forwarding"

components/lwip/lwip

@@ -157,18 +157,32 @@
    --------------------------------
 */
 /**
- * IP_REASSEMBLY==1: Reassemble incoming fragmented IP packets. Note that
+ * IP_REASSEMBLY==1: Reassemble incoming fragmented IP4 packets. Note that
  * this option does not affect outgoing packet sizes, which can be controlled
  * via IP_FRAG.
  */
-#define IP_REASSEMBLY                   CONFIG_LWIP_IP_REASSEMBLY
+#define IP_REASSEMBLY                   CONFIG_LWIP_IP4_REASSEMBLY
 
 /**
- * IP_FRAG==1: Fragment outgoing IP packets if their size exceeds MTU. Note
+ * LWIP_IPV6_REASS==1: reassemble incoming IP6 packets that fragmented. Note that
+ * this option does not affect outgoing packet sizes, which can be controlled
+ * via LWIP_IPV6_FRAG.
+ */
+#define LWIP_IPV6_REASS                 CONFIG_LWIP_IP6_REASSEMBLY
+
+/**
+ * IP_FRAG==1: Fragment outgoing IP4 packets if their size exceeds MTU. Note
+ * that this option does not affect incoming packet sizes, which can be
+ * controlled via IP_REASSEMBLY.
+ */
+#define IP_FRAG                         CONFIG_LWIP_IP4_FRAG
+
+/**
+ * LWIP_IPV6_FRAG==1: Fragment outgoing IP6 packets if their size exceeds MTU. Note
  * that this option does not affect incoming packet sizes, which can be
  * controlled via IP_REASSEMBLY.
  */
-#define IP_FRAG                         CONFIG_LWIP_IP_FRAG
+#define LWIP_IPV6_FRAG                  CONFIG_LWIP_IP6_FRAG
 
 /**
  * IP_REASS_MAXAGE: Maximum time (in multiples of IP_TMR_INTERVAL - so seconds, normally)