/** @file

Copyright (c) 2006 - 2007, 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:

  Dhcp4Driver.c

Abstract:


**/

#include "Dhcp4Impl.h"
#include "Dhcp4Driver.h"

EFI_DRIVER_BINDING_PROTOCOL gDhcp4DriverBinding = {
  Dhcp4DriverBindingSupported,
  Dhcp4DriverBindingStart,
  Dhcp4DriverBindingStop,
  0xa,
  NULL,
  NULL
};

EFI_SERVICE_BINDING_PROTOCOL mDhcp4ServiceBindingTemplete = {
  Dhcp4ServiceBindingCreateChild,
  Dhcp4ServiceBindingDestroyChild
};

//@MT: EFI_DRIVER_ENTRY_POINT (Dhcp4DriverEntryPoint)

EFI_STATUS
EFIAPI
Dhcp4DriverEntryPoint (
  IN EFI_HANDLE             ImageHandle,
  IN EFI_SYSTEM_TABLE       *SystemTable
  )
/*++

Routine Description:

  Entry point of the DHCP driver to install various protocols.

Arguments:

  ImageHandle - The driver's image handle
  SystemTable - The system table

Returns:

  EFI_SUCCESS - All the related protocols are installed.
  Others      - Failed to install the protocols.

--*/
{
  return NetLibInstallAllDriverProtocols (
           ImageHandle,
           SystemTable,
           &gDhcp4DriverBinding,
           ImageHandle,
           &gDhcp4ComponentName,
           NULL,
           NULL
           );
}


/**
  Test to see if DHCP driver supports the ControllerHandle.

  @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_SUCCES             This driver supports this device
  @retval other                  This driver does not support this device

**/
EFI_STATUS
EFIAPI
Dhcp4DriverBindingSupported (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   ControllerHandle,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath OPTIONAL
  )
{
  EFI_STATUS  Status;

  Status = gBS->OpenProtocol (
                  ControllerHandle,
                  &gEfiUdp4ServiceBindingProtocolGuid,
                  NULL,
                  This->DriverBindingHandle,
                  ControllerHandle,
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL
                  );

  return Status;
}



/**
  Configure the default UDP child to receive all the DHCP traffics
  on this network interface.

  @param  UdpIo                  The UDP IO port to configure
  @param  Context                The context to the function

  @retval EFI_SUCCESS            The UDP IO port is successfully configured.
  @retval Others                 Failed to configure the UDP child.

**/
EFI_STATUS
DhcpConfigUdpIo (
  IN UDP_IO_PORT            *UdpIo,
  IN VOID                   *Context
  )
{
  EFI_UDP4_CONFIG_DATA      UdpConfigData;

  UdpConfigData.AcceptBroadcast           = TRUE;
  UdpConfigData.AcceptPromiscuous         = FALSE;
  UdpConfigData.AcceptAnyPort             = FALSE;
  UdpConfigData.AllowDuplicatePort        = TRUE;
  UdpConfigData.TypeOfService             = 0;
  UdpConfigData.TimeToLive                = 64;
  UdpConfigData.DoNotFragment             = FALSE;
  UdpConfigData.ReceiveTimeout            = 0;
  UdpConfigData.TransmitTimeout           = 0;

  UdpConfigData.UseDefaultAddress         = FALSE;
  UdpConfigData.StationPort               = DHCP_CLIENT_PORT;
  UdpConfigData.RemotePort                = DHCP_SERVER_PORT;

  NetZeroMem (&UdpConfigData.StationAddress, sizeof (EFI_IPv4_ADDRESS));
  NetZeroMem (&UdpConfigData.SubnetMask, sizeof (EFI_IPv4_ADDRESS));
  NetZeroMem (&UdpConfigData.RemoteAddress, sizeof (EFI_IPv4_ADDRESS));

  return UdpIo->Udp->Configure (UdpIo->Udp, &UdpConfigData);;
}



/**
  Destory the DHCP service. The Dhcp4 service may be partly initialized,
  or partly destoried. If a resource is destoried, it is marked as so in
  case the destory failed and being called again later.

  @param  DhcpSb                 The DHCP service instance to destory.

  @retval EFI_SUCCESS            The DHCP service is successfully closed.

**/
EFI_STATUS
Dhcp4CloseService (
  IN DHCP_SERVICE           *DhcpSb
  )
{
  DhcpCleanLease (DhcpSb);

  if (DhcpSb->UdpIo != NULL) {
    UdpIoFreePort (DhcpSb->UdpIo);
    DhcpSb->UdpIo = NULL;
  }

  if (DhcpSb->Timer != NULL) {
    gBS->SetTimer (DhcpSb->Timer, TimerCancel, 0);
    gBS->CloseEvent (DhcpSb->Timer);

    DhcpSb->Timer = NULL;
  }

  return EFI_SUCCESS;
}



/**
  Create a new DHCP service binding instance for the controller.

  @param  Controller             The controller to install DHCP service binding
                                 protocol onto
  @param  ImageHandle            The driver's image handle
  @param  Service                The variable to receive the created DHCP service
                                 instance.

  @retval EFI_OUT_OF_RESOURCES   Failed to allocate resource .
  @retval EFI_SUCCESS            The DHCP service instance is created.

**/
EFI_STATUS
Dhcp4CreateService (
  IN  EFI_HANDLE            Controller,
  IN  EFI_HANDLE            ImageHandle,
  OUT DHCP_SERVICE          **Service
  )
{
  DHCP_SERVICE              *DhcpSb;
  EFI_STATUS                Status;

  *Service  = NULL;
  DhcpSb    = NetAllocateZeroPool (sizeof (DHCP_SERVICE));

  if (DhcpSb == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  DhcpSb->Signature       = DHCP_SERVICE_SIGNATURE;
  DhcpSb->ServiceBinding  = mDhcp4ServiceBindingTemplete;
  DhcpSb->ServiceState    = DHCP_UNCONFIGED;
  DhcpSb->InDestory       = FALSE;
  DhcpSb->Controller      = Controller;
  DhcpSb->Image           = ImageHandle;
  NetListInit (&DhcpSb->Children);
  DhcpSb->DhcpState       = Dhcp4Stopped;
  DhcpSb->Xid             = NET_RANDOM (NetRandomInitSeed ());

  //
  // Create various resources, UdpIo, Timer, and get Mac address
  //
  Status = gBS->CreateEvent (
                  EVT_NOTIFY_SIGNAL | EVT_TIMER,
                  TPL_CALLBACK,
                  DhcpOnTimerTick,
                  DhcpSb,
                  &DhcpSb->Timer
                  );

  if (EFI_ERROR (Status)) {
    goto ON_ERROR;
  }

  DhcpSb->UdpIo = UdpIoCreatePort (Controller, ImageHandle, DhcpConfigUdpIo, NULL);

  if (DhcpSb->UdpIo == NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    goto ON_ERROR;
  }

  DhcpSb->HwLen  = (UINT8) DhcpSb->UdpIo->SnpMode.HwAddressSize;
  DhcpSb->HwType = DhcpSb->UdpIo->SnpMode.IfType;
  CopyMem (&DhcpSb->Mac, &DhcpSb->UdpIo->SnpMode.CurrentAddress, sizeof (EFI_MAC_ADDRESS));

  *Service       = DhcpSb;
  return EFI_SUCCESS;

ON_ERROR:
  Dhcp4CloseService (DhcpSb);
  NetFreePool (DhcpSb);

  return Status;
}


/**
  Start this driver on ControllerHandle.

  @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_SUCCES             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
Dhcp4DriverBindingStart (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   ControllerHandle,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath OPTIONAL
  )
{
  DHCP_SERVICE              *DhcpSb;
  EFI_STATUS                Status;

  //
  // First: test for the DHCP4 Protocol
  //
  Status = gBS->OpenProtocol (
                  ControllerHandle,
                  &gEfiDhcp4ServiceBindingProtocolGuid,
                  NULL,
                  This->DriverBindingHandle,
                  ControllerHandle,
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL
                  );

  if (Status == EFI_SUCCESS) {
    return EFI_ALREADY_STARTED;
  }

  Status = Dhcp4CreateService (ControllerHandle, This->DriverBindingHandle, &DhcpSb);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  Status = gBS->SetTimer (DhcpSb->Timer, TimerPeriodic, TICKS_PER_SECOND);

  if (EFI_ERROR (Status)) {
    goto ON_ERROR;
  }

  //
  // Install the Dhcp4ServiceBinding Protocol onto ControlerHandle
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &ControllerHandle,
                  &gEfiDhcp4ServiceBindingProtocolGuid,
                  &DhcpSb->ServiceBinding,
                  NULL
                  );

  if (EFI_ERROR (Status)) {
    goto ON_ERROR;
  }

  return Status;

ON_ERROR:
  Dhcp4CloseService (DhcpSb);
  NetFreePool (DhcpSb);
  return Status;
}


/**
  Stop this driver on ControllerHandle.

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

**/
EFI_STATUS
EFIAPI
Dhcp4DriverBindingStop (
  IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN  EFI_HANDLE                   ControllerHandle,
  IN  UINTN                        NumberOfChildren,
  IN  EFI_HANDLE                   *ChildHandleBuffer
  )
{
  EFI_SERVICE_BINDING_PROTOCOL  *ServiceBinding;
  DHCP_SERVICE                  *DhcpSb;
  DHCP_PROTOCOL                 *Instance;
  EFI_HANDLE                    NicHandle;
  EFI_STATUS                    Status;
  EFI_TPL                       OldTpl;

  //
  // DHCP driver opens UDP child, So, the ControllerHandle is the
  // UDP child handle. locate the Nic handle first.
  //
  NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiUdp4ProtocolGuid);

  if (NicHandle == NULL) {
    return EFI_SUCCESS;
  }

   Status = gBS->OpenProtocol (
                  NicHandle,
                  &gEfiDhcp4ServiceBindingProtocolGuid,
                  (VOID **) &ServiceBinding,
                  This->DriverBindingHandle,
                  NicHandle,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );

  if (EFI_ERROR (Status)) {
    return EFI_DEVICE_ERROR;
  }

  DhcpSb = DHCP_SERVICE_FROM_THIS (ServiceBinding);

  if (DhcpSb->InDestory) {
    return EFI_SUCCESS;
  }

  OldTpl            = NET_RAISE_TPL (NET_TPL_LOCK);
  DhcpSb->InDestory = TRUE;

  //
  // Don't use NET_LIST_FOR_EACH_SAFE here, Dhcp4ServiceBindingDestoryChild
  // may cause other child to be deleted.
  //
  while (!NetListIsEmpty (&DhcpSb->Children)) {
    Instance = NET_LIST_HEAD (&DhcpSb->Children, DHCP_PROTOCOL, Link);
    Dhcp4ServiceBindingDestroyChild (ServiceBinding, Instance->Handle);
  }

  if (DhcpSb->NumChildren != 0) {
    Status = EFI_DEVICE_ERROR;
    goto ON_ERROR;
  }

  DhcpSb->ServiceState  = DHCP_DESTORY;

  Status = gBS->UninstallProtocolInterface (
                  NicHandle,
                  &gEfiDhcp4ServiceBindingProtocolGuid,
                  ServiceBinding
                  );

  if (EFI_ERROR (Status)) {
    goto ON_ERROR;
  }

  Dhcp4CloseService (DhcpSb);
  NET_RESTORE_TPL (OldTpl);

  NetFreePool (DhcpSb);
  return EFI_SUCCESS;

ON_ERROR:
  DhcpSb->InDestory = FALSE;
  NET_RESTORE_TPL (OldTpl);
  return Status;
}


/**
  Initialize a new DHCP child

  @param  DhcpSb                 The dhcp service instance
  @param  Instance               The dhcp instance to initialize

  @return None

**/
VOID
DhcpInitProtocol (
  IN DHCP_SERVICE           *DhcpSb,
  IN DHCP_PROTOCOL          *Instance
  )
{
  Instance->Signature         = DHCP_PROTOCOL_SIGNATURE;
  CopyMem (&Instance->Dhcp4Protocol, &mDhcp4ProtocolTemplate, sizeof (EFI_DHCP4_PROTOCOL));
  NetListInit (&Instance->Link);
  Instance->Handle            = NULL;
  Instance->Service           = DhcpSb;
  Instance->InDestory         = FALSE;
  Instance->CompletionEvent   = NULL;
  Instance->RenewRebindEvent  = NULL;
  Instance->Token             = NULL;
}


/**
  Creates a child handle with a set of DHCP4 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 DHCP4 services are added to
                                 the existing  child handle.

  @retval EFI_SUCCES             The child handle was created with the DHCP4
                                 services
  @retval EFI_OUT_OF_RESOURCES   There are not enough resources to create the child
  @retval other                  The child handle was not created

**/
EFI_STATUS
EFIAPI
Dhcp4ServiceBindingCreateChild (
  IN EFI_SERVICE_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                    *ChildHandle
  )
{
  DHCP_SERVICE              *DhcpSb;
  DHCP_PROTOCOL             *Instance;
  EFI_STATUS                Status;
  EFI_TPL                   OldTpl;
  VOID                      *Udp4;

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

  Instance = NetAllocatePool (sizeof (*Instance));

  if (Instance == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  DhcpSb = DHCP_SERVICE_FROM_THIS (This);
  DhcpInitProtocol (DhcpSb, Instance);

  //
  // Install DHCP4 onto ChildHandle
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  ChildHandle,
                  &gEfiDhcp4ProtocolGuid,
                  &Instance->Dhcp4Protocol,
                  NULL
                  );

  if (EFI_ERROR (Status)) {
    NetFreePool (Instance);
    return Status;
  }

  Instance->Handle  = *ChildHandle;

  //
  // Open the Udp4 protocol BY_CHILD.
  //
  Status = gBS->OpenProtocol (
                  DhcpSb->UdpIo->UdpHandle,
                  &gEfiUdp4ProtocolGuid,
                  (VOID **) &Udp4,
                  gDhcp4DriverBinding.DriverBindingHandle,
                  Instance->Handle,
                  EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
                  );
  if (EFI_ERROR (Status)) {
    gBS->UninstallMultipleProtocolInterfaces (
           Instance->Handle,
           &gEfiDhcp4ProtocolGuid,
           &Instance->Dhcp4Protocol,
           NULL
           );

    NetFreePool (Instance);
    return Status;
  }

  OldTpl = NET_RAISE_TPL (NET_TPL_LOCK);

  NetListInsertTail (&DhcpSb->Children, &Instance->Link);
  DhcpSb->NumChildren++;

  NET_RESTORE_TPL (OldTpl);

  return EFI_SUCCESS;
}


/**
  Destroys a child handle with a set of DHCP4 services.

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

  @retval EFI_SUCCES             The DHCP4 service is removed from the child handle
  @retval EFI_UNSUPPORTED        The child handle does not support the DHCP4
                                 service
  @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  DHCP4 services are being used.
  @retval other                  The child handle was not destroyed

**/
EFI_STATUS
EFIAPI
Dhcp4ServiceBindingDestroyChild (
  IN EFI_SERVICE_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                    ChildHandle
  )
{
  DHCP_SERVICE              *DhcpSb;
  DHCP_PROTOCOL             *Instance;
  EFI_DHCP4_PROTOCOL        *Dhcp;
  EFI_TPL                   OldTpl;
  EFI_STATUS                Status;

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

  //
  // Retrieve the private context data structures
  //
  Status = gBS->OpenProtocol (
                  ChildHandle,
                  &gEfiDhcp4ProtocolGuid,
                  (VOID **) &Dhcp,
                  gDhcp4DriverBinding.DriverBindingHandle,
                  ChildHandle,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );

  if (EFI_ERROR (Status)) {
    return EFI_UNSUPPORTED;
  }

  Instance  = DHCP_INSTANCE_FROM_THIS (Dhcp);
  DhcpSb    = DHCP_SERVICE_FROM_THIS (This);

  if (Instance->Service != DhcpSb) {
    return EFI_INVALID_PARAMETER;
  }

  //
  // A child can be destoried more than once. For example,
  // Dhcp4DriverBindingStop will destory all of its children.
  // when caller driver is being stopped, it will destory the
  // dhcp child it opens.
  //
  if (Instance->InDestory) {
    return EFI_SUCCESS;
  }

  OldTpl = NET_RAISE_TPL (NET_TPL_LOCK);
  Instance->InDestory = TRUE;

  //
  // Close the Udp4 protocol.
  //
  gBS->CloseProtocol (
         DhcpSb->UdpIo->UdpHandle,
         &gEfiUdp4ProtocolGuid,
         gDhcp4DriverBinding.DriverBindingHandle,
         ChildHandle
         );

  //
  // Uninstall the DHCP4 protocol first to enable a top down destruction.
  //
  Status = gBS->UninstallProtocolInterface (
                  ChildHandle,
                  &gEfiDhcp4ProtocolGuid,
                  Dhcp
                  );

  if (EFI_ERROR (Status)) {
    Instance->InDestory = FALSE;

    NET_RESTORE_TPL (OldTpl);
    return Status;
  }

  if (DhcpSb->ActiveChild == Instance) {
    DhcpYieldControl (DhcpSb);
  }

  NetListRemoveEntry (&Instance->Link);
  DhcpSb->NumChildren--;

  NET_RESTORE_TPL (OldTpl);

  NetFreePool (Instance);
  return EFI_SUCCESS;
}