1. Add Link MTU support to IP4 and TCP4 driver.

2. Integrate IPsec functionality to IP4 driver.
3. Move IP_VERSION_4/IP_VERSION_6 definition from IpIoLib to NetLib.
4. Move the Ip6/Udp6 protocol declaration from driver INF to Library INF (DxeIpIoLib and DxeUdpIoLib) for better readability.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9413 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Output.c

@@ -291,9 +291,29 @@ Ip4Output (
     }
   }
 
+  //
+  // TODO: currently Option/OptLen are not included into encryption scope.
+  //
+  Status = Ip4IpSecProcessPacket (
+             IpSb, 
+             Head, 
+             &Packet, 
+             Option, 
+             OptLen, 
+             EfiIPsecOutBound,
+             Context
+             );
+
+  if (EFI_ERROR(Status)) {
+    return Status;
+  }
+
   //
   // OK, selected the source and route, fragment the packet then send
   // them. Tag each fragment other than the first one as spawn from it.
+
+  //
+  // IPsec payload has been appended, so use IpSb->SnpMode.MaxPacketSize here.
   //
   Mtu            = IpSb->SnpMode.MaxPacketSize;
   HeadLen        = sizeof (IP4_HEAD) + ((OptLen + 3) & (~0x03));