audk/MdeModulePkg/Universal/Network/Udp4Dxe/Udp4Driver.c

/** @file

Copyright (c) 2006, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

Module Name:

  Udp4Driver.c

Abstract:


**/


#include "Udp4Impl.h"

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

EFI_SERVICE_BINDING_PROTOCOL mUdp4ServiceBinding = {
  Udp4ServiceBindingCreateChild,
  Udp4ServiceBindingDestroyChild
};


/**
  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  This                Protocol instance pointer.
  @param  ControllerHandle    Handle of device to test
  @param  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  This                 Protocol instance pointer.
  @param  ControllerHandle     Handle of device to bind driver to
  @param  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)) {
    gBS->FreePool (Udp4Service);
    return Status;
  }

  //
  // Install the Udp4ServiceBindingProtocol on the ControllerHandle.
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &ControllerHandle,
                  &gEfiUdp4ServiceBindingProtocolGuid,
                  &Udp4Service->ServiceBinding,
                  NULL
                  );
  if (EFI_ERROR (Status)) {
    Udp4CleanService (Udp4Service);
    gBS->FreePool (Udp4Service);
  } else {
    Udp4SetVariableData (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  This              Protocol instance pointer.
  @param  ControllerHandle  Handle of device to stop driver on
  @param  NumberOfChildren  Number of Handles in ChildHandleBuffer. If number of
                            children is zero stop the entire bus driver.
  @param  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_INSTANCE_DATA            *Instance;

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

  //
  // 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) {

    gBS->UninstallMultipleProtocolInterfaces (
           NicHandle,
           &gEfiUdp4ServiceBindingProtocolGuid,
           &Udp4Service->ServiceBinding,
           NULL
           );

    Udp4ClearVariableData (Udp4Service);

    Udp4CleanService (Udp4Service);

    gBS->FreePool (Udp4Service);
  } else {

    while (!IsListEmpty (&Udp4Service->ChildrenList)) {
      Instance = NET_LIST_HEAD (&Udp4Service->ChildrenList, UDP4_INSTANCE_DATA, Link);

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

  return Status;
}


/**
  Creates a child handle with a set of I/O services.

  @param  This        Protocol instance pointer.
  @param  ChildHandle Pointer to the handle of the child to create.  If it is NULL,
                      then a new handle is created.  If it is not NULL, then the
                      I/O services are added to the existing child handle.

  @retval EFI_SUCCES            The child handle was created with the I/O services
  @retval EFI_INVALID_PARAMETER ChildHandle is NULL.
  @retval EFI_OUT_OF_RESOURCES  There are not enough resources availabe 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;
  }

  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);

  gBS->FreePool (Instance);

  return Status;
}


/**
  Destroys a child handle with a set of I/O services.

  @param  This        Protocol instance pointer.
  @param  ChildHandle Handle of the child to destroy

  @retval EFI_SUCCES            The I/O services were removed from the child handle
  @retval EFI_UNSUPPORTED       The child handle does not support the I/O services
                                that are being removed.
  @retval EFI_INVALID_PARAMETER Child handle is not a valid EFI Handle.
  @retval EFI_ACCESS_DENIED     The child handle could not be destroyed because its
                                I/O 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->Destroyed) {
    return EFI_SUCCESS;
  }

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

  //
  // Close the Ip4 protocol.
  //
  gBS->CloseProtocol (
         Udp4Service->IpIo->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->Destroyed = 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);

  gBS->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  ImageHandle           The firmware allocated handle for the UEFI image.
  @param  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;

  //
  // 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) NetRandomInitSeed ()) % UDP4_PORT_KNOWN + UDP4_PORT_KNOWN);
  }

  return Status;
}