NetworkPkg: UefiPxeBcDxe: SECURITY PATCH CVE-2023-45235 Unit Tests

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=4540

Unit tests to confirm that the bug..

Buffer overflow when handling Server ID option from a DHCPv6 proxy
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..has been patched.

This patch contains unit tests for the following functions:
PxeBcRequestBootService
PxeBcDhcp6Discover

Cc: Saloni Kasbekar <saloni.kasbekar@intel.com>
Cc: Zachary Clark-williams <zachary.clark-williams@intel.com>

Signed-off-by: Doug Flick [MSFT] <doug.edk2@gmail.com>
Reviewed-by: Saloni Kasbekar <saloni.kasbekar@intel.com>

NetworkPkg/UefiPxeBcDxe/GoogleTest/PxeBcDhcp6GoogleTest.h

@@ -47,4 +47,22 @@ PxeBcCacheDnsServerAddresses (
   IN PXEBC_DHCP6_PACKET_CACHE  *Cache6
   );
 
+/**
+  Build and send out the request packet for the bootfile, and parse the reply.
+
+  @param[in]  Private               The pointer to PxeBc private data.
+  @param[in]  Index                 PxeBc option boot item type.
+
+  @retval     EFI_SUCCESS           Successfully discovered the boot file.
+  @retval     EFI_OUT_OF_RESOURCES  Failed to allocate resources.
+  @retval     EFI_NOT_FOUND         Can't get the PXE reply packet.
+  @retval     Others                Failed to discover the boot file.
+
+**/
+EFI_STATUS
+PxeBcRequestBootService (
+  IN  PXEBC_PRIVATE_DATA  *Private,
+  IN  UINT32              Index
+  );
+
 #endif // PXE_BC_DHCP6_GOOGLE_TEST_H_