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audk/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c

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/** @file
Copyright (c) 2005 - 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:
Ip4Driver.c
Abstract:
The driver binding and service binding protocol for IP4 driver.
**/
#include "Ip4Impl.h"
EFI_DRIVER_BINDING_PROTOCOL gIp4DriverBinding = {
Ip4DriverBindingSupported,
Ip4DriverBindingStart,
Ip4DriverBindingStop,
0xa,
NULL,
NULL
};
EFI_STATUS
EFIAPI
Ip4DriverEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
/*++
Routine Description:
The entry point for IP4 driver which install the driver
binding and component name protocol on its image.
Arguments:
ImageHandle - The image handle of the driver
SystemTable - The system table
Returns:
EFI_SUCCESS if the driver binding and component name protocols
are successfully installed, otherwise if failed.
--*/
{
return EfiLibInstallDriverBindingComponentName2 (
ImageHandle,
SystemTable,
&gIp4DriverBinding,
ImageHandle,
&gIp4ComponentName,
&gIp4ComponentName2
);
}
/**
Test to see if this driver supports 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 EFI_ALREADY_STARTED This driver is already running on this device
@retval other This driver does not support this device
**/
EFI_STATUS
EFIAPI
Ip4DriverBindingSupported (
IN EFI_DRIVER_BINDING_PROTOCOL * This,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH_PROTOCOL * RemainingDevicePath OPTIONAL
)
{
EFI_STATUS Status;
//
// Test for the MNP service binding Protocol
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiManagedNetworkServiceBindingProtocolGuid,
NULL,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_TEST_PROTOCOL
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Test for the Arp service binding Protocol
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiArpServiceBindingProtocolGuid,
NULL,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_TEST_PROTOCOL
);
return Status;
}
EFI_STATUS
Ip4CleanService (
IN IP4_SERVICE *IpSb
);
/**
Create a new IP4 driver service binding protocol
@param Controller The controller that has MNP service binding
installed
@param ImageHandle The IP4 driver's image handle
@param Service The variable to receive the newly created IP4
service.
@retval EFI_OUT_OF_RESOURCES Failed to allocate some resource
@retval EFI_SUCCESS A new IP4 service binding private is created.
**/
EFI_STATUS
Ip4CreateService (
IN EFI_HANDLE Controller,
IN EFI_HANDLE ImageHandle,
OUT IP4_SERVICE **Service
)
{
IP4_SERVICE *IpSb;
EFI_STATUS Status;
ASSERT (Service != NULL);
*Service = NULL;
//
// allocate a service private data then initialize all the filed to
// empty resources, so if any thing goes wrong when allocating
// resources, Ip4CleanService can be called to clean it up.
//
IpSb = AllocatePool (sizeof (IP4_SERVICE));
if (IpSb == NULL) {
return EFI_OUT_OF_RESOURCES;
}
IpSb->Signature = IP4_SERVICE_SIGNATURE;
IpSb->ServiceBinding.CreateChild = Ip4ServiceBindingCreateChild;
IpSb->ServiceBinding.DestroyChild = Ip4ServiceBindingDestroyChild;
IpSb->State = IP4_SERVICE_UNSTARTED;
IpSb->InDestory = FALSE;
IpSb->NumChildren = 0;
InitializeListHead (&IpSb->Children);
InitializeListHead (&IpSb->Interfaces);
IpSb->DefaultInterface = NULL;
IpSb->DefaultRouteTable = NULL;
Ip4InitAssembleTable (&IpSb->Assemble);
IpSb->IgmpCtrl.Igmpv1QuerySeen = 0;
InitializeListHead (&IpSb->IgmpCtrl.Groups);
IpSb->Image = ImageHandle;
IpSb->Controller = Controller;
IpSb->MnpChildHandle = NULL;
IpSb->Mnp = NULL;
IpSb->MnpConfigData.ReceivedQueueTimeoutValue = 0;
IpSb->MnpConfigData.TransmitQueueTimeoutValue = 0;
IpSb->MnpConfigData.ProtocolTypeFilter = IP4_ETHER_PROTO;
IpSb->MnpConfigData.EnableUnicastReceive = TRUE;
IpSb->MnpConfigData.EnableMulticastReceive = TRUE;
IpSb->MnpConfigData.EnableBroadcastReceive = TRUE;
IpSb->MnpConfigData.EnablePromiscuousReceive = FALSE;
IpSb->MnpConfigData.FlushQueuesOnReset = TRUE;
IpSb->MnpConfigData.EnableReceiveTimestamps = FALSE;
IpSb->MnpConfigData.DisableBackgroundPolling = FALSE;
ZeroMem (&IpSb->SnpMode, sizeof (EFI_SIMPLE_NETWORK_MODE));
IpSb->Timer = NULL;
IpSb->Ip4Config = NULL;
IpSb->DoneEvent = NULL;
IpSb->ReconfigEvent = NULL;
IpSb->ActiveEvent = NULL;
//
// Create various resources. First create the route table, timer
// event and MNP child. IGMP, interface's initialization depend
// on the MNP child.
//
IpSb->DefaultRouteTable = Ip4CreateRouteTable ();
if (IpSb->DefaultRouteTable == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto ON_ERROR;
}
Status = gBS->CreateEvent (
EVT_NOTIFY_SIGNAL | EVT_TIMER,
TPL_CALLBACK,
Ip4TimerTicking,
IpSb,
&IpSb->Timer
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = NetLibCreateServiceChild (
Controller,
ImageHandle,
&gEfiManagedNetworkServiceBindingProtocolGuid,
&IpSb->MnpChildHandle
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = gBS->OpenProtocol (
IpSb->MnpChildHandle,
&gEfiManagedNetworkProtocolGuid,
(VOID **) &IpSb->Mnp,
ImageHandle,
Controller,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Ip4ServiceConfigMnp (IpSb, TRUE);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = IpSb->Mnp->GetModeData (IpSb->Mnp, NULL, &IpSb->SnpMode);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Ip4InitIgmp (IpSb);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
IpSb->DefaultInterface = Ip4CreateInterface (IpSb->Mnp, Controller, ImageHandle);
if (IpSb->DefaultInterface == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto ON_ERROR;
}
InsertHeadList (&IpSb->Interfaces, &IpSb->DefaultInterface->Link);
IpSb->MacString = NULL;
*Service = IpSb;
return EFI_SUCCESS;
ON_ERROR:
Ip4CleanService (IpSb);
gBS->FreePool (IpSb);
return Status;
}
/**
Clean up a IP4 service binding instance. It will release all
the resource allocated by the instance. The instance may be
partly initialized, or partly destoried. If a resource is
destoried, it is marked as that in case the destory failed and
being called again later.
@param IpSb The IP4 serviceing binding instance to clean up
@retval EFI_SUCCESS The resource used by the instance are cleaned up
@retval Others Failed to clean up some of the resources.
**/
EFI_STATUS
Ip4CleanService (
IN IP4_SERVICE *IpSb
)
{
EFI_STATUS Status;
if (IpSb->DefaultInterface != NULL) {
Status = Ip4FreeInterface (IpSb->DefaultInterface, NULL);
if (EFI_ERROR (Status)) {
return Status;
}
IpSb->DefaultInterface = NULL;
}
if (IpSb->DefaultRouteTable != NULL) {
Ip4FreeRouteTable (IpSb->DefaultRouteTable);
IpSb->DefaultRouteTable = NULL;
}
Ip4CleanAssembleTable (&IpSb->Assemble);
if (IpSb->MnpChildHandle != NULL) {
if (IpSb->Mnp) {
gBS->CloseProtocol (
IpSb->MnpChildHandle,
&gEfiManagedNetworkProtocolGuid,
IpSb->Image,
IpSb->Controller
);
IpSb->Mnp = NULL;
}
NetLibDestroyServiceChild (
IpSb->Controller,
IpSb->Image,
&gEfiManagedNetworkServiceBindingProtocolGuid,
IpSb->MnpChildHandle
);
IpSb->MnpChildHandle = NULL;
}
if (IpSb->Timer != NULL) {
gBS->SetTimer (IpSb->Timer, TimerCancel, 0);
gBS->CloseEvent (IpSb->Timer);
IpSb->Timer = NULL;
}
if (IpSb->Ip4Config != NULL) {
IpSb->Ip4Config->Stop (IpSb->Ip4Config);
gBS->CloseProtocol (
IpSb->Controller,
&gEfiIp4ConfigProtocolGuid,
IpSb->Image,
IpSb->Controller
);
gBS->CloseEvent (IpSb->DoneEvent);
gBS->CloseEvent (IpSb->ReconfigEvent);
IpSb->ActiveEvent = NULL;
IpSb->Ip4Config = NULL;
}
return EFI_SUCCESS;
}
/**
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
Ip4DriverBindingStart (
IN EFI_DRIVER_BINDING_PROTOCOL * This,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH_PROTOCOL * RemainingDevicePath OPTIONAL
)
{
IP4_SERVICE *IpSb;
EFI_STATUS Status;
//
// Test for the Ip4 service binding protocol
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiIp4ServiceBindingProtocolGuid,
NULL,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_TEST_PROTOCOL
);
if (Status == EFI_SUCCESS) {
return EFI_ALREADY_STARTED;
}
Status = Ip4CreateService (ControllerHandle, This->DriverBindingHandle, &IpSb);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Install the Ip4ServiceBinding Protocol onto ControlerHandle
//
Status = gBS->InstallMultipleProtocolInterfaces (
&ControllerHandle,
&gEfiIp4ServiceBindingProtocolGuid,
&IpSb->ServiceBinding,
NULL
);
if (EFI_ERROR (Status)) {
goto FREE_SERVICE;
}
//
// ready to go: start the receiving and timer
//
Status = Ip4ReceiveFrame (IpSb->DefaultInterface, NULL, Ip4AccpetFrame, IpSb);
if (EFI_ERROR (Status)) {
goto UNINSTALL_PROTOCOL;
}
Status = gBS->SetTimer (IpSb->Timer, TimerPeriodic, TICKS_PER_SECOND);
if (EFI_ERROR (Status)) {
goto UNINSTALL_PROTOCOL;
}
//
// Initialize the IP4 ID
//
mIp4Id = (UINT16)NET_RANDOM (NetRandomInitSeed ());
Ip4SetVariableData (IpSb);
return Status;
UNINSTALL_PROTOCOL:
gBS->UninstallProtocolInterface (
ControllerHandle,
&gEfiIp4ServiceBindingProtocolGuid,
&IpSb->ServiceBinding
);
FREE_SERVICE:
Ip4CleanService (IpSb);
gBS->FreePool (IpSb);
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
Ip4DriverBindingStop (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN UINTN NumberOfChildren,
IN EFI_HANDLE *ChildHandleBuffer
)
{
EFI_SERVICE_BINDING_PROTOCOL *ServiceBinding;
IP4_SERVICE *IpSb;
IP4_PROTOCOL *IpInstance;
EFI_HANDLE NicHandle;
EFI_STATUS Status;
EFI_TPL OldTpl;
INTN State;
BOOLEAN IsArp;
//
// IP4 driver opens the MNP child, ARP children or the IP4_CONFIG protocol
// by driver. So the ControllerHandle may be the MNP child handle, ARP child
// handle, or the NIC (UNDI) handle because IP4_CONFIG protocol is installed
// in the NIC handle.
//
//
// First, check whether it is the IP4_CONFIG protocol being uninstalled.
// IP4_CONFIG protocol is installed on the NIC handle. It isn't necessary
// to clean up the default configuration if IP4_CONFIG is being stopped.
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiIp4ConfigProtocolGuid,
NULL,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_TEST_PROTOCOL
);
if (Status == EFI_SUCCESS) {
//
// Retrieve the IP4 service binding protocol. If failed, it is
// likely that Ip4 ServiceBinding is uninstalled already. In this
// case, return immediately.
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiIp4ServiceBindingProtocolGuid,
(VOID **) &ServiceBinding,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (EFI_ERROR (Status)) {
return EFI_DEVICE_ERROR;
}
IpSb = IP4_SERVICE_FROM_PROTOCOL (ServiceBinding);
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
if (IpSb->Ip4Config && (IpSb->State != IP4_SERVICE_DESTORY)) {
IpSb->Ip4Config->Stop (IpSb->Ip4Config);
Status = gBS->CloseProtocol (
ControllerHandle,
&gEfiIp4ConfigProtocolGuid,
IpSb->Image,
ControllerHandle
);
if (EFI_ERROR (Status)) {
gBS->RestoreTPL (OldTpl);
return Status;
}
//
// If the auto configure hasn't complete, mark it as not started.
//
if (IpSb->State == IP4_SERVICE_STARTED) {
IpSb->State = IP4_SERVICE_UNSTARTED;
}
IpSb->Ip4Config = NULL;
gBS->CloseEvent (IpSb->DoneEvent);
gBS->CloseEvent (IpSb->ReconfigEvent);
}
gBS->RestoreTPL (OldTpl);
return EFI_SUCCESS;
}
//
// Either MNP or ARP protocol is being uninstalled. The controller
// handle is either the MNP child or ARP child. But, the IP4's
// service binding is installed on the NIC handle. So, need to open
// the protocol info to find the NIC handle.
//
IsArp = FALSE;
NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiManagedNetworkProtocolGuid);
if (NicHandle == NULL) {
NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiArpProtocolGuid);
IsArp = TRUE;
}
if (NicHandle == NULL) {
return EFI_DEVICE_ERROR;
}
//
// Retrieve the IP4 service binding protocol
//
Status = gBS->OpenProtocol (
NicHandle,
&gEfiIp4ServiceBindingProtocolGuid,
(VOID **) &ServiceBinding,
This->DriverBindingHandle,
NicHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (EFI_ERROR (Status)) {
return EFI_DEVICE_ERROR;
}
IpSb = IP4_SERVICE_FROM_PROTOCOL (ServiceBinding);
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
if (IpSb->InDestory) {
gBS->RestoreTPL (OldTpl);
return EFI_SUCCESS;
}
if (IsArp) {
while (!IsListEmpty (&IpSb->Children)) {
IpInstance = NET_LIST_HEAD (&IpSb->Children, IP4_PROTOCOL, Link);
ServiceBinding->DestroyChild (ServiceBinding, IpInstance->Handle);
}
if (IpSb->NumChildren != 0) {
Status = EFI_DEVICE_ERROR;
goto ON_ERROR;
}
IpSb->InDestory = TRUE;
State = IpSb->State;
IpSb->State = IP4_SERVICE_DESTORY;
//
// Clear the variable data.
//
Ip4ClearVariableData (IpSb);
//
// OK, clean other resources then uninstall the service binding protocol.
//
Status = Ip4CleanService (IpSb);
if (EFI_ERROR (Status)) {
IpSb->State = State;
goto ON_ERROR;
}
gBS->UninstallProtocolInterface (
NicHandle,
&gEfiIp4ServiceBindingProtocolGuid,
ServiceBinding
);
gBS->FreePool (IpSb);
} else if (NumberOfChildren == 0) {
IpSb->InDestory = TRUE;
State = IpSb->State;
IpSb->State = IP4_SERVICE_DESTORY;
//
// Clear the variable data.
//
Ip4ClearVariableData (IpSb);
//
// OK, clean other resources then uninstall the service binding protocol.
//
Status = Ip4CleanService (IpSb);
if (EFI_ERROR (Status)) {
IpSb->State = State;
goto ON_ERROR;
}
gBS->UninstallProtocolInterface (
NicHandle,
&gEfiIp4ServiceBindingProtocolGuid,
ServiceBinding
);
gBS->FreePool (IpSb);
} else {
while (!IsListEmpty (&IpSb->Children)) {
IpInstance = NET_LIST_HEAD (&IpSb->Children, IP4_PROTOCOL, Link);
ServiceBinding->DestroyChild (ServiceBinding, IpInstance->Handle);
}
if (IpSb->NumChildren != 0) {
Status = EFI_DEVICE_ERROR;
}
}
ON_ERROR:
gBS->RestoreTPL (OldTpl);
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_OUT_OF_RESOURCES There are not enough resources availabe to create
the child
@retval other The child handle was not created
**/
EFI_STATUS
EFIAPI
Ip4ServiceBindingCreateChild (
IN EFI_SERVICE_BINDING_PROTOCOL *This,
IN EFI_HANDLE *ChildHandle
)
{
IP4_SERVICE *IpSb;
IP4_PROTOCOL *IpInstance;
EFI_TPL OldTpl;
EFI_STATUS Status;
VOID *Mnp;
if ((This == NULL) || (ChildHandle == NULL)) {
return EFI_INVALID_PARAMETER;
}
IpSb = IP4_SERVICE_FROM_PROTOCOL (This);
IpInstance = AllocatePool (sizeof (IP4_PROTOCOL));
if (IpInstance == NULL) {
return EFI_OUT_OF_RESOURCES;
}
Ip4InitProtocol (IpSb, IpInstance);
//
// Install Ip4 onto ChildHandle
//
Status = gBS->InstallMultipleProtocolInterfaces (
ChildHandle,
&gEfiIp4ProtocolGuid,
&IpInstance->Ip4Proto,
NULL
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
IpInstance->Handle = *ChildHandle;
//
// Open the Managed Network protocol BY_CHILD.
//
Status = gBS->OpenProtocol (
IpSb->MnpChildHandle,
&gEfiManagedNetworkProtocolGuid,
(VOID **) &Mnp,
gIp4DriverBinding.DriverBindingHandle,
IpInstance->Handle,
EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
);
if (EFI_ERROR (Status)) {
gBS->UninstallMultipleProtocolInterfaces (
ChildHandle,
&gEfiIp4ProtocolGuid,
&IpInstance->Ip4Proto,
NULL
);
goto ON_ERROR;
}
//
// Insert it into the service binding instance.
//
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
InsertTailList (&IpSb->Children, &IpInstance->Link);
IpSb->NumChildren++;
gBS->RestoreTPL (OldTpl);
ON_ERROR:
if (EFI_ERROR (Status)) {
Ip4CleanProtocol (IpInstance);
gBS->FreePool (IpInstance);
}
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
Ip4ServiceBindingDestroyChild (
IN EFI_SERVICE_BINDING_PROTOCOL *This,
IN EFI_HANDLE ChildHandle
)
{
EFI_STATUS Status;
IP4_SERVICE *IpSb;
IP4_PROTOCOL *IpInstance;
EFI_IP4_PROTOCOL *Ip4;
EFI_TPL OldTpl;
INTN State;
if ((This == NULL) || (ChildHandle == NULL)) {
return EFI_INVALID_PARAMETER;
}
//
// Retrieve the private context data structures
//
IpSb = IP4_SERVICE_FROM_PROTOCOL (This);
Status = gBS->OpenProtocol (
ChildHandle,
&gEfiIp4ProtocolGuid,
(VOID **) &Ip4,
gIp4DriverBinding.DriverBindingHandle,
ChildHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (EFI_ERROR (Status)) {
return EFI_UNSUPPORTED;
}
IpInstance = IP4_INSTANCE_FROM_PROTOCOL (Ip4);
if (IpInstance->Service != IpSb) {
return EFI_INVALID_PARAMETER;
}
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
//
// A child can be destoried more than once. For example,
// Ip4DriverBindingStop will destory all of its children.
// when UDP driver is being stopped, it will destory all
// the IP child it opens.
//
if (IpInstance->State == IP4_STATE_DESTORY) {
gBS->RestoreTPL (OldTpl);
return EFI_SUCCESS;
}
State = IpInstance->State;
IpInstance->State = IP4_STATE_DESTORY;
//
// Close the Managed Network protocol.
//
gBS->CloseProtocol (
IpSb->MnpChildHandle,
&gEfiManagedNetworkProtocolGuid,
gIp4DriverBinding.DriverBindingHandle,
ChildHandle
);
//
// Uninstall the IP4 protocol first. Many thing happens during
// this:
// 1. The consumer of the IP4 protocol will be stopped if it
// opens the protocol BY_DRIVER. For eaxmple, if MNP driver is
// stopped, IP driver's stop function will be called, and uninstall
// EFI_IP4_PROTOCOL will trigger the UDP's stop function. This
// makes it possible to create the network stack bottom up, and
// stop it top down.
// 2. the upper layer will recycle the received packet. The recycle
// event's TPL is higher than this function. The recycle events
// will be called back before preceeding. If any packets not recycled,
// that means there is a resource leak.
//
Status = gBS->UninstallProtocolInterface (
ChildHandle,
&gEfiIp4ProtocolGuid,
&IpInstance->Ip4Proto
);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
Status = Ip4CleanProtocol (IpInstance);
Ip4SetVariableData (IpSb);
if (EFI_ERROR (Status)) {
gBS->InstallMultipleProtocolInterfaces (
&ChildHandle,
&gEfiIp4ProtocolGuid,
Ip4,
NULL
);
goto ON_ERROR;
}
RemoveEntryList (&IpInstance->Link);
IpSb->NumChildren--;
gBS->RestoreTPL (OldTpl);
gBS->FreePool (IpInstance);
return EFI_SUCCESS;
ON_ERROR:
IpInstance->State = State;
gBS->RestoreTPL (OldTpl);
return Status;
}
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