Support IPv6 Unique Local Addresses

This change correctly identifies ULAs with the fc00::/7 prefix, so
that they can be assigned to endpoints and correctly matched to
received packets.

Author: marcusb

source/FreeRTOS_IPv6_Utils.c

@@ -317,7 +317,7 @@ void vManageSolicitedNodeAddress( const struct xNetworkEndPoint * pxEndPoint,
         /* Solicited-node multicast addresses only apply to normal unicast non-loopback addresses. */
         xAddressType = xIPv6_GetIPType( &( pxEndPoint->ipv6_settings.xIPAddress ) );
 
-        if( ( xAddressType != eIPv6_LinkLocal ) && ( xAddressType != eIPv6_SiteLocal ) && ( xAddressType != eIPv6_Global ) )
+        if( ( xAddressType != eIPv6_LinkLocal ) && ( xAddressType != eIPv6_SiteLocal ) && ( xAddressType != eIPv6_UniqueLocal ) && ( xAddressType != eIPv6_Global ) )
         {
             /* The address of this end-point is something other than a normal unicast address... Maybe it's the
              * loopback address or maybe this is an error scenario. In any case, there is no corresponding

source/FreeRTOS_Routing.c

@@ -1411,12 +1411,13 @@ struct xIPv6_Couple
         BaseType_t xIndex;
         static const struct xIPv6_Couple xIPCouples[] =
         {
-            /*    IP-type          Mask     Value */
-            { eIPv6_Global,    0xE000U, 0x2000U }, /* 001 */
-            { eIPv6_LinkLocal, 0xFFC0U, 0xFE80U }, /* 1111 1110 10 */
-            { eIPv6_SiteLocal, 0xFFC0U, 0xFEC0U }, /* 1111 1110 11 */
-            { eIPv6_Multicast, 0xFF00U, 0xFF00U }, /* 1111 1111 */
-            { eIPv6_Loopback,  0xFFFFU, 0x0000U }, /* 0000 0000 ::1 */
+            /*    IP-type         Mask     Value */
+            { eIPv6_Global,      0xE000U, 0x2000U }, /* 001 */
+            { eIPv6_LinkLocal,   0xFFC0U, 0xFE80U }, /* 1111 1110 10 */
+            { eIPv6_SiteLocal,   0xFFC0U, 0xFEC0U }, /* 1111 1110 11 */
+            { eIPv6_UniqueLocal, 0xFE00U, 0xFC00U }, /* 1111 110 */
+            { eIPv6_Multicast,   0xFF00U, 0xFF00U }, /* 1111 1111 */
+            { eIPv6_Loopback,    0xFFFFU, 0x0000U }, /* 0000 0000 ::1 */
         };
 
         if( pxAddress != NULL )

source/include/FreeRTOS_Routing.h

@@ -352,12 +352,13 @@
 
     typedef enum
     {
-        eIPv6_Global,    /* 001           */
-        eIPv6_LinkLocal, /* 1111 1110 10  */
-        eIPv6_SiteLocal, /* 1111 1110 11  */
-        eIPv6_Multicast, /* 1111 1111     */
-        eIPv6_Loopback,  /* 1111 (::1)    */
-        eIPv6_Unknown    /* Not implemented. */
+        eIPv6_Global,        /* 001           */
+        eIPv6_LinkLocal,     /* 1111 1110 10  */
+        eIPv6_SiteLocal,     /* 1111 1110 11  */
+        eIPv6_UniqueLocal,   /* 1111 110      */
+        eIPv6_Multicast,     /* 1111 1111     */
+        eIPv6_Loopback,      /* 1111 (::1)    */
+        eIPv6_Unknown        /* Not implemented. */
     }
     IPv6_Type_t;
 

test/unit-test/FreeRTOS_IP/FreeRTOS_IP_utest.c

@@ -4419,6 +4419,26 @@ void test_prvIPNetworkUpCalls_SiteLocal()
     prvIPNetworkUpCalls_Generic( ucAddress, eIPv6_SiteLocal, ipHAS_IPV6 | ipHAS_METHOD );
 }
 
+void test_prvIPNetworkUpCalls_UniqueLocal()
+{
+    /* Use the unique local address fd12:3456:789a:1::1 */
+    static const uint8_t ucAddress[ 16 ] =
+    {
+        0xFDU, 0x12U,
+        0x34U, 0x56U,
+        0x78U, 0x9AU,
+        0x00U, 0x01U,
+        0x00U, 0x00U,
+        0x00U, 0x00U,
+        0x00U, 0x00U,
+        0x00U, 0x01U
+    };
+
+    prvIPNetworkUpCalls_Generic( ucAddress, eIPv6_UniqueLocal, ipHAS_IPV6 | ipHAS_METHOD | ipHAS_INTERFACE );
+    prvIPNetworkUpCalls_Generic( ucAddress, eIPv6_UniqueLocal, ipHAS_IPV6 | ipHAS_INTERFACE );
+    prvIPNetworkUpCalls_Generic( ucAddress, eIPv6_UniqueLocal, ipHAS_IPV6 | ipHAS_METHOD );
+}
+
 void test_prvIPNetworkUpCalls_Multicast()
 {
     /* Use the multicast address "ff02::fb",

test/unit-test/FreeRTOS_Routing/FreeRTOS_Routing_utest.c

@@ -2645,6 +2645,24 @@ void test_xIPv6_GetIPType_SiteLocal()
     TEST_ASSERT_EQUAL( eIPv6_SiteLocal, xReturn );
 }
 
+/**
+ * @brief xIPv6_GetIPType returns eIPv6_UniqueLocal if input address matches FC00::/7.
+ *
+ * Test step:
+ *  - Create 1 IPv6 address.
+ *     - Set the IP address to FD12:3456:789A:1::1.
+ *  - Call xIPv6_GetIPType to check IP type.
+ *  - Check if it returns eIPv6_UniqueLocal.
+ */
+void test_xIPv6_GetIPType_UniqueLocal()
+{
+    const IPv6_Address_t xIPv6Address = { 0xFD, 0x12, 0x34, 0x56, 0x78, 0x9A, 0, 0x01, 0, 0, 0, 0, 0, 0, 0, 0x01 };
+    IPv6_Type_t xReturn;
+
+    xReturn = xIPv6_GetIPType( &xIPv6Address );
+    TEST_ASSERT_EQUAL( eIPv6_UniqueLocal, xReturn );
+}
+
 /**
  * @brief xIPv6_GetIPType returns eIPv6_Multicast if input address matches FF00::/8.
  *