/** @file

Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
Copyright (c) Microsoft Corporation
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "Udp4Impl.h"

EFI_DRIVER_BINDING_PROTOCOL  gUdp4DriverBinding = {
  Udp4DriverBindingSupported,
  Udp4DriverBindingStart,
  Udp4DriverBindingStop,
  0xa,
  NULL,
  NULL
};

EFI_SERVICE_BINDING_PROTOCOL  mUdp4ServiceBinding = {
  Udp4ServiceBindingCreateChild,
  Udp4ServiceBindingDestroyChild
};

/**
  Callback function which provided by user to remove one node in NetDestroyLinkList process.

  @param[in]    Entry           The entry to be removed.
  @param[in]    Context         Pointer to the callback context corresponds to the Context in NetDestroyLinkList.

  @retval EFI_SUCCESS           The entry has been removed successfully.
  @retval Others                Fail to remove the entry.

**/
EFI_STATUS
EFIAPI
Udp4DestroyChildEntryInHandleBuffer (
  IN LIST_ENTRY  *Entry,
  IN VOID        *Context
  )
{
  UDP4_INSTANCE_DATA            *Instance;
  EFI_SERVICE_BINDING_PROTOCOL  *ServiceBinding;
  UINTN                         NumberOfChildren;
  EFI_HANDLE                    *ChildHandleBuffer;

  if ((Entry == NULL) || (Context == NULL)) {
    return EFI_INVALID_PARAMETER;
  }

  Instance          = NET_LIST_USER_STRUCT_S (Entry, UDP4_INSTANCE_DATA, Link, UDP4_INSTANCE_DATA_SIGNATURE);
  ServiceBinding    = ((UDP4_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT *)Context)->ServiceBinding;
  NumberOfChildren  = ((UDP4_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT *)Context)->NumberOfChildren;
  ChildHandleBuffer = ((UDP4_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT *)Context)->ChildHandleBuffer;

  if (!NetIsInHandleBuffer (Instance->ChildHandle, NumberOfChildren, ChildHandleBuffer)) {
    return EFI_SUCCESS;
  }

  return ServiceBinding->DestroyChild (ServiceBinding, Instance->ChildHandle);
}

/**
  Test to see if this driver supports ControllerHandle. This service
  is called by the EFI boot service ConnectController(). In
  order to make drivers as small as possible, there are a few calling
  restrictions for this service. ConnectController() must
  follow these calling restrictions. If any other agent wishes to call
  Supported() it must also follow these calling restrictions.

  @param[in]  This                Protocol instance pointer.
  @param[in]  ControllerHandle    Handle of device to test
  @param[in]  RemainingDevicePath Optional parameter use to pick a specific child
                                  device to start.

  @retval EFI_SUCCESS         This driver supports this device
  @retval EFI_ALREADY_STARTED This driver is already running on this device
  @retval other               This driver does not support this device

**/
EFI_STATUS
EFIAPI
Udp4DriverBindingSupported (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   ControllerHandle,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath  OPTIONAL
  )
{
  EFI_STATUS  Status;

  //
  // Test for the Udp4ServiceBinding Protocol
  //
  Status = gBS->OpenProtocol (
                  ControllerHandle,
                  &gEfiUdp4ServiceBindingProtocolGuid,
                  NULL,
                  This->DriverBindingHandle,
                  ControllerHandle,
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL
                  );
  if (!EFI_ERROR (Status)) {
    return EFI_ALREADY_STARTED;
  }

  //
  // Test for the Ip4 Protocol
  //
  Status = gBS->OpenProtocol (
                  ControllerHandle,
                  &gEfiIp4ServiceBindingProtocolGuid,
                  NULL,
                  This->DriverBindingHandle,
                  ControllerHandle,
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL
                  );

  return Status;
}

/**
  Start this driver on ControllerHandle. This service is called by the
  EFI boot service ConnectController(). In order to make
  drivers as small as possible, there are a few calling restrictions for
  this service. ConnectController() must follow these
  calling restrictions. If any other agent wishes to call Start() it
  must also follow these calling restrictions.

  @param[in]  This                 Protocol instance pointer.
  @param[in]  ControllerHandle     Handle of device to bind driver to
  @param[in]  RemainingDevicePath  Optional parameter use to pick a specific child
                                   device to start.

  @retval EFI_SUCCESS          This driver is added to ControllerHandle
  @retval EFI_ALREADY_STARTED  This driver is already running on ControllerHandle
  @retval other                This driver does not support this device

**/
EFI_STATUS
EFIAPI
Udp4DriverBindingStart (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   ControllerHandle,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath  OPTIONAL
  )
{
  EFI_STATUS         Status;
  UDP4_SERVICE_DATA  *Udp4Service;

  //
  // Allocate Private Context Data Structure.
  //
  Udp4Service = AllocatePool (sizeof (UDP4_SERVICE_DATA));
  if (Udp4Service == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  Status = Udp4CreateService (Udp4Service, This->DriverBindingHandle, ControllerHandle);
  if (EFI_ERROR (Status)) {
    FreePool (Udp4Service);
    return Status;
  }

  //
  // Install the Udp4ServiceBindingProtocol on the ControllerHandle.
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &ControllerHandle,
                  &gEfiUdp4ServiceBindingProtocolGuid,
                  &Udp4Service->ServiceBinding,
                  NULL
                  );
  if (EFI_ERROR (Status)) {
    Udp4CleanService (Udp4Service);
    FreePool (Udp4Service);
  }

  return Status;
}

/**
  Stop this driver on ControllerHandle. This service is called by the
  EFI boot service DisconnectController(). In order to
  make drivers as small as possible, there are a few calling
  restrictions for this service. DisconnectController()
  must follow these calling restrictions. If any other agent wishes
  to call Stop() it must also follow these calling restrictions.

  @param[in]  This              Protocol instance pointer.
  @param[in]  ControllerHandle  Handle of device to stop driver on
  @param[in]  NumberOfChildren  Number of Handles in ChildHandleBuffer. If number of
                                children is zero stop the entire bus driver.
  @param[in]  ChildHandleBuffer List of Child Handles to Stop.

  @retval EFI_SUCCESS       This driver is removed ControllerHandle
  @retval other             This driver was not removed from this device

**/
EFI_STATUS
EFIAPI
Udp4DriverBindingStop (
  IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN  EFI_HANDLE                   ControllerHandle,
  IN  UINTN                        NumberOfChildren,
  IN  EFI_HANDLE                   *ChildHandleBuffer
  )
{
  EFI_STATUS                                Status;
  EFI_HANDLE                                NicHandle;
  EFI_SERVICE_BINDING_PROTOCOL              *ServiceBinding;
  UDP4_SERVICE_DATA                         *Udp4Service;
  UDP4_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT  Context;
  LIST_ENTRY                                *List;

  //
  // Find the NicHandle where UDP4 ServiceBinding Protocol is installed.
  //
  NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiIp4ProtocolGuid);
  if (NicHandle == NULL) {
    return EFI_SUCCESS;
  }

  //
  // Retrieve the UDP4 ServiceBinding Protocol.
  //
  Status = gBS->OpenProtocol (
                  NicHandle,
                  &gEfiUdp4ServiceBindingProtocolGuid,
                  (VOID **)&ServiceBinding,
                  This->DriverBindingHandle,
                  NicHandle,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    return EFI_DEVICE_ERROR;
  }

  Udp4Service = UDP4_SERVICE_DATA_FROM_THIS (ServiceBinding);
  if (NumberOfChildren != 0) {
    //
    // NumberOfChildren is not zero, destroy the children instances in ChildHandleBuffer.
    //
    List                      = &Udp4Service->ChildrenList;
    Context.ServiceBinding    = ServiceBinding;
    Context.NumberOfChildren  = NumberOfChildren;
    Context.ChildHandleBuffer = ChildHandleBuffer;
    Status                    = NetDestroyLinkList (
                                  List,
                                  Udp4DestroyChildEntryInHandleBuffer,
                                  &Context,
                                  NULL
                                  );
  } else {
    gBS->UninstallMultipleProtocolInterfaces (
           NicHandle,
           &gEfiUdp4ServiceBindingProtocolGuid,
           &Udp4Service->ServiceBinding,
           NULL
           );

    Udp4CleanService (Udp4Service);

    if (gUdpControllerNameTable != NULL) {
      FreeUnicodeStringTable (gUdpControllerNameTable);
      gUdpControllerNameTable = NULL;
    }

    FreePool (Udp4Service);
  }

  return Status;
}

/**
  Creates a child handle and installs a protocol.

  The CreateChild() function installs a protocol on ChildHandle.
  If ChildHandle is a pointer to NULL, then a new handle is created and returned in ChildHandle.
  If ChildHandle is not a pointer to NULL, then the protocol installs on the existing ChildHandle.

  @param[in] This        Pointer to the EFI_SERVICE_BINDING_PROTOCOL instance.
  @param[in] ChildHandle Pointer to the handle of the child to create. If it is NULL,
                         then a new handle is created. If it is a pointer to an existing UEFI handle,
                         then the protocol is added to the existing UEFI handle.

  @retval EFI_SUCCESS           The protocol was added to ChildHandle.
  @retval EFI_INVALID_PARAMETER ChildHandle is NULL.
  @retval EFI_OUT_OF_RESOURCES  There are not enough resources available to create
                                the child
  @retval other                 The child handle was not created

**/
EFI_STATUS
EFIAPI
Udp4ServiceBindingCreateChild (
  IN EFI_SERVICE_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                    *ChildHandle
  )
{
  EFI_STATUS          Status;
  UDP4_SERVICE_DATA   *Udp4Service;
  UDP4_INSTANCE_DATA  *Instance;
  EFI_TPL             OldTpl;
  VOID                *Ip4;

  if ((This == NULL) || (ChildHandle == NULL)) {
    return EFI_INVALID_PARAMETER;
  }

  Udp4Service = UDP4_SERVICE_DATA_FROM_THIS (This);

  //
  // Allocate the instance private data structure.
  //
  Instance = AllocateZeroPool (sizeof (UDP4_INSTANCE_DATA));
  if (Instance == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  Udp4InitInstance (Udp4Service, Instance);

  //
  // Add an IpInfo for this instance.
  //
  Instance->IpInfo = IpIoAddIp (Udp4Service->IpIo);
  if (Instance->IpInfo == NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    goto ON_ERROR;
  }

  //
  // Install the Udp4Protocol for this instance.
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  ChildHandle,
                  &gEfiUdp4ProtocolGuid,
                  &Instance->Udp4Proto,
                  NULL
                  );
  if (EFI_ERROR (Status)) {
    goto ON_ERROR;
  }

  Instance->ChildHandle = *ChildHandle;

  //
  // Open the default Ip4 protocol in the IP_IO BY_CHILD.
  //
  Status = gBS->OpenProtocol (
                  Udp4Service->IpIo->ChildHandle,
                  &gEfiIp4ProtocolGuid,
                  (VOID **)&Ip4,
                  gUdp4DriverBinding.DriverBindingHandle,
                  Instance->ChildHandle,
                  EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
                  );
  if (EFI_ERROR (Status)) {
    goto ON_ERROR;
  }

  //
  // Open this instance's Ip4 protocol in the IpInfo BY_CHILD.
  //
  Status = gBS->OpenProtocol (
                  Instance->IpInfo->ChildHandle,
                  &gEfiIp4ProtocolGuid,
                  (VOID **)&Ip4,
                  gUdp4DriverBinding.DriverBindingHandle,
                  Instance->ChildHandle,
                  EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
                  );
  if (EFI_ERROR (Status)) {
    goto ON_ERROR;
  }

  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);

  //
  // Link this instance into the service context data and increase the ChildrenNumber.
  //
  InsertTailList (&Udp4Service->ChildrenList, &Instance->Link);
  Udp4Service->ChildrenNumber++;

  gBS->RestoreTPL (OldTpl);

  return EFI_SUCCESS;

ON_ERROR:

  if (Instance->ChildHandle != NULL) {
    gBS->UninstallMultipleProtocolInterfaces (
           Instance->ChildHandle,
           &gEfiUdp4ProtocolGuid,
           &Instance->Udp4Proto,
           NULL
           );
  }

  if (Instance->IpInfo != NULL) {
    IpIoRemoveIp (Udp4Service->IpIo, Instance->IpInfo);
  }

  Udp4CleanInstance (Instance);

  FreePool (Instance);

  return Status;
}

/**
  Destroys a child handle with a protocol installed on it.

  The DestroyChild() function does the opposite of CreateChild(). It removes a protocol
  that was installed by CreateChild() from ChildHandle. If the removed protocol is the
  last protocol on ChildHandle, then ChildHandle is destroyed.

  @param[in] This        Pointer to the EFI_SERVICE_BINDING_PROTOCOL instance.
  @param[in] ChildHandle Handle of the child to destroy

  @retval EFI_SUCCESS           The protocol was removed from ChildHandle.
  @retval EFI_UNSUPPORTED       ChildHandle does not support the protocol that is being removed.
  @retval EFI_INVALID_PARAMETER Child handle is NULL.
  @retval EFI_ACCESS_DENIED     The protocol could not be removed from the ChildHandle
                                because its services are being used.
  @retval other                 The child handle was not destroyed

**/
EFI_STATUS
EFIAPI
Udp4ServiceBindingDestroyChild (
  IN EFI_SERVICE_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                    ChildHandle
  )
{
  EFI_STATUS          Status;
  UDP4_SERVICE_DATA   *Udp4Service;
  EFI_UDP4_PROTOCOL   *Udp4Proto;
  UDP4_INSTANCE_DATA  *Instance;
  EFI_TPL             OldTpl;

  if ((This == NULL) || (ChildHandle == NULL)) {
    return EFI_INVALID_PARAMETER;
  }

  Udp4Service = UDP4_SERVICE_DATA_FROM_THIS (This);

  //
  // Try to get the Udp4 protocol from the ChildHandle.
  //
  Status = gBS->OpenProtocol (
                  ChildHandle,
                  &gEfiUdp4ProtocolGuid,
                  (VOID **)&Udp4Proto,
                  gUdp4DriverBinding.DriverBindingHandle,
                  ChildHandle,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );
  if (EFI_ERROR (Status)) {
    return EFI_UNSUPPORTED;
  }

  Instance = UDP4_INSTANCE_DATA_FROM_THIS (Udp4Proto);

  if (Instance->InDestroy) {
    return EFI_SUCCESS;
  }

  //
  // Use the Destroyed flag to avoid the re-entering of the following code.
  //
  Instance->InDestroy = TRUE;

  //
  // Close the Ip4 protocol.
  //
  gBS->CloseProtocol (
         Udp4Service->IpIo->ChildHandle,
         &gEfiIp4ProtocolGuid,
         gUdp4DriverBinding.DriverBindingHandle,
         Instance->ChildHandle
         );
  //
  // Close the Ip4 protocol on this instance's IpInfo.
  //
  gBS->CloseProtocol (
         Instance->IpInfo->ChildHandle,
         &gEfiIp4ProtocolGuid,
         gUdp4DriverBinding.DriverBindingHandle,
         Instance->ChildHandle
         );

  //
  // Uninstall the Udp4Protocol previously installed on the ChildHandle.
  //
  Status = gBS->UninstallMultipleProtocolInterfaces (
                  ChildHandle,
                  &gEfiUdp4ProtocolGuid,
                  (VOID *)&Instance->Udp4Proto,
                  NULL
                  );
  if (EFI_ERROR (Status)) {
    Instance->InDestroy = FALSE;
    return Status;
  }

  //
  // Reset the configuration in case the instance's consumer forgets to do this.
  //
  Udp4Proto->Configure (Udp4Proto, NULL);

  //
  // Remove the IpInfo this instance consumes.
  //
  IpIoRemoveIp (Udp4Service->IpIo, Instance->IpInfo);

  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);

  //
  // Remove this instance from the service context data's ChildrenList.
  //
  RemoveEntryList (&Instance->Link);
  Udp4Service->ChildrenNumber--;

  //
  // Clean the instance.
  //
  Udp4CleanInstance (Instance);

  gBS->RestoreTPL (OldTpl);

  FreePool (Instance);

  return EFI_SUCCESS;
}

/**
  This is the declaration of an EFI image entry point. This entry point is
  the same for UEFI Applications, UEFI OS Loaders, and UEFI Drivers including
  both device drivers and bus drivers.

  The entry point for Udp4 driver which installs the driver binding
  and component name protocol on its ImageHandle.

  @param[in] ImageHandle           The firmware allocated handle for the UEFI image.
  @param[in] SystemTable           A pointer to the EFI System Table.

  @retval EFI_SUCCESS           The operation completed successfully.
  @retval EFI_OUT_OF_RESOURCES  The request could not be completed due to a lack of resources.

**/
EFI_STATUS
EFIAPI
Udp4DriverEntryPoint (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS  Status;
  UINT32      Random;

  Status = PseudoRandomU32 (&Random);
  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "%a failed to generate random number: %r\n", __func__, Status));
    return Status;
  }

  //
  // Install the Udp4DriverBinding and Udp4ComponentName protocols.
  //
  Status = EfiLibInstallDriverBindingComponentName2 (
             ImageHandle,
             SystemTable,
             &gUdp4DriverBinding,
             ImageHandle,
             &gUdp4ComponentName,
             &gUdp4ComponentName2
             );
  if (!EFI_ERROR (Status)) {
    //
    // Initialize the UDP random port.
    //
    mUdp4RandomPort = (UINT16)(((UINT16)Random) % UDP4_PORT_KNOWN + UDP4_PORT_KNOWN);
  }

  return Status;
}