[Change summary]:

1. Update NetLib to a combined NetLib support dual network stack:
1) Add Network Debug facility for IPv4 stack.
2) Extend the library APIs to support IPv6 stack:
   a. NetIp6IsUnspecifiedAddr
   b. NetIp6IsLinkLocalAddr   
   c. NetIp6IsNetEqual
   d. NetLibCreateIPv6DPathNode.
   e. NetIp6PseudoHeadChecksum
   f. NetIp6IsValidUnicast
3) Update the structure definitions:
   a. Update NET_BUF to add EFI_IP6_HEADER and EFI_UDP_HEADER
   b. Add NET_IP6_PSEUDO_HDR
4) Update Ip4IsUnicast to NetIp4IsUnicast

2. Update the impacted modules to adopt the combined NetLib.

3. Clean up coding style errors in all network drivers and libraries.


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9391 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Impl.h

@@ -43,18 +43,18 @@ typedef struct _DHCP_PROTOCOL DHCP_PROTOCOL;
 #define DHCP_SERVICE_SIGNATURE   SIGNATURE_32 ('D', 'H', 'C', 'P')
 #define DHCP_PROTOCOL_SIGNATURE  SIGNATURE_32 ('d', 'h', 'c', 'p')
 
-typedef enum {
-  //
-  // The state of the DHCP service. It starts as UNCONFIGED. If
-  // and active child configures the service successfully, it
-  // goes to CONFIGED. If the active child configures NULL, it
-  // goes back to UNCONFIGED. It becomes DESTORY if it is (partly)
-  // destoried.
-  //
-  DHCP_UNCONFIGED         = 0,
-  DHCP_CONFIGED,
-  DHCP_DESTORY
-} DHCP_STATE;
+
+//
+// The state of the DHCP service. It starts as UNCONFIGED. If
+// and active child configures the service successfully, it
+// goes to CONFIGED. If the active child configures NULL, it
+// goes back to UNCONFIGED. It becomes DESTORY if it is (partly)
+// destoried.
+//
+#define DHCP_UNCONFIGED          0
+#define DHCP_CONFIGED            1
+#define DHCP_DESTORY             2
+
 
 struct _DHCP_PROTOCOL {
   UINT32                            Signature;