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4354ec05faa3aa88a8064c0ff4d03fc03b15e70d
system76-edk2/MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Impl.c
qhuang8 51195fbe8c Remove several unicode in comments. 
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7501 6f19259b-4bc3-4df7-8a09-765794883524
2009-02-11 06:02:54 +00:00

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/** @file
This file implement the EFI_DHCP4_PROTOCOL interface.
Copyright (c) 2006 - 2008, Intel Corporation.<BR>
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.
**/
#include "Dhcp4Impl.h"
/**
Returns the current operating mode and cached data packet for the EFI DHCPv4 Protocol driver.
The GetModeData() function returns the current operating mode and cached data
packet for the EFI DHCPv4 Protocol driver.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param[out] Dhcp4ModeData Pointer to storage for the EFI_DHCP4_MODE_DATA structure.
@retval EFI_SUCCESS The mode data was returned.
@retval EFI_INVALID_PARAMETER This is NULL.
**/
EFI_STATUS
EFIAPI
EfiDhcp4GetModeData (
IN EFI_DHCP4_PROTOCOL *This,
OUT EFI_DHCP4_MODE_DATA *Dhcp4ModeData
);
/**
Initializes, changes, or resets the operational settings for the EFI DHCPv4 Protocol driver.
The Configure() function is used to initialize, change, or reset the operational
settings of the EFI DHCPv4 Protocol driver for the communication device on which
the EFI DHCPv4 Service Binding Protocol is installed. This function can be
successfully called only if both of the following are true:
* This instance of the EFI DHCPv4 Protocol driver is in the Dhcp4Stopped, Dhcp4Init,
Dhcp4InitReboot, or Dhcp4Bound states.
* No other EFI DHCPv4 Protocol driver instance that is controlled by this EFI
DHCPv4 Service Binding Protocol driver instance has configured this EFI DHCPv4
Protocol driver.
When this driver is in the Dhcp4Stopped state, it can transfer into one of the
following two possible initial states:
* Dhcp4Init
* Dhcp4InitReboot
The driver can transfer into these states by calling Configure() with a non-NULL
Dhcp4CfgData. The driver will transfer into the appropriate state based on the
supplied client network address in the ClientAddress parameter and DHCP options
in the OptionList parameter as described in RFC 2131.
When Configure() is called successfully while Dhcp4CfgData is set to NULL, the
default configuring data will be reset in the EFI DHCPv4 Protocol driver and
the state of the EFI DHCPv4 Protocol driver will not be changed. If one instance
wants to make it possible for another instance to configure the EFI DHCPv4 Protocol
driver, it must call this function with Dhcp4CfgData set to NULL.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param[in] Dhcp4CfgData Pointer to the EFI_DHCP4_CONFIG_DATA.
@retval EFI_SUCCESS The EFI DHCPv4 Protocol driver is now in the Dhcp4Init or
Dhcp4InitReboot state, if the original state of this driver
was Dhcp4Stopped and the value of Dhcp4CfgData was
not NULL. Otherwise, the state was left unchanged.
@retval EFI_ACCESS_DENIED This instance of the EFI DHCPv4 Protocol driver was not in the
Dhcp4Stopped, Dhcp4Init, Dhcp4InitReboot, or Dhcp4Bound state;
Or onother instance of this EFI DHCPv4 Protocol driver is already
in a valid configured state.
@retval EFI_INVALID_PARAMETER Some parameter is NULL.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval EFI_DEVICE_ERROR An unexpected system or network error occurred.
**/
EFI_STATUS
EFIAPI
EfiDhcp4Configure (
IN EFI_DHCP4_PROTOCOL *This,
IN EFI_DHCP4_CONFIG_DATA *Dhcp4CfgData OPTIONAL
);
/**
Starts the DHCP configuration process.
The Start() function starts the DHCP configuration process. This function can
be called only when the EFI DHCPv4 Protocol driver is in the Dhcp4Init or
Dhcp4InitReboot state.
If the DHCP process completes successfully, the state of the EFI DHCPv4 Protocol
driver will be transferred through Dhcp4Selecting and Dhcp4Requesting to the
Dhcp4Bound state. The CompletionEvent will then be signaled if it is not NULL.
If the process aborts, either by the user or by some unexpected network error,
the state is restored to the Dhcp4Init state. The Start() function can be called
again to restart the process.
Refer to RFC 2131 for precise state transitions during this process. At the
time when each event occurs in this process, the callback function that was set
by EFI_DHCP4_PROTOCOL.Configure() will be called and the user can take this
opportunity to control the process.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param[in] CompletionEvent If not NULL, indicates the event that will be signaled when the
EFI DHCPv4 Protocol driver is transferred into the
Dhcp4Bound state or when the DHCP process is aborted.
EFI_DHCP4_PROTOCOL.GetModeData() can be called to
check the completion status. If NULL,
EFI_DHCP4_PROTOCOL.Start() will wait until the driver
is transferred into the Dhcp4Bound state or the process fails.
@retval EFI_SUCCESS The DHCP configuration process has started, or it has completed
when CompletionEvent is NULL.
@retval EFI_NOT_STARTED The EFI DHCPv4 Protocol driver is in the Dhcp4Stopped
state. EFI_DHCP4_PROTOCOL. Configure() needs to be called.
@retval EFI_INVALID_PARAMETER This is NULL.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval EFI_TIMEOUT The DHCP configuration process failed because no response was
received from the server within the specified timeout value.
@retval EFI_ABORTED The user aborted the DHCP process.
@retval EFI_ALREADY_STARTED Some other EFI DHCPv4 Protocol instance already started the
DHCP process.
@retval EFI_DEVICE_ERROR An unexpected system or network error occurred.
**/
EFI_STATUS
EFIAPI
EfiDhcp4Start (
IN EFI_DHCP4_PROTOCOL *This,
IN EFI_EVENT CompletionEvent OPTIONAL
);
/**
Extends the lease time by sending a request packet.
The RenewRebind() function is used to manually extend the lease time when the
EFI DHCPv4 Protocol driver is in the Dhcp4Bound state and the lease time has
not expired yet. This function will send a request packet to the previously
found server (or to any server when RebindRequest is TRUE) and transfer the
state into the Dhcp4Renewing state (or Dhcp4Rebinding when RebindingRequest is
TRUE). When a response is received, the state is returned to Dhcp4Bound.
If no response is received before the try count is exceeded (the RequestTryCount
field that is specified in EFI_DHCP4_CONFIG_DATA) but before the lease time that
was issued by the previous server expires, the driver will return to the Dhcp4Bound
state and the previous configuration is restored. The outgoing and incoming packets
can be captured by the EFI_DHCP4_CALLBACK function.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param[in] RebindRequest If TRUE, this function broadcasts the request packets and enters
the Dhcp4Rebinding state. Otherwise, it sends a unicast
request packet and enters the Dhcp4Renewing state.
@param[in] CompletionEvent If not NULL, this event is signaled when the renew/rebind phase
completes or some error occurs.
EFI_DHCP4_PROTOCOL.GetModeData() can be called to
check the completion status. If NULL,
EFI_DHCP4_PROTOCOL.RenewRebind() will busy-wait
until the DHCP process finishes.
@retval EFI_SUCCESS The EFI DHCPv4 Protocol driver is now in the
Dhcp4Renewing state or is back to the Dhcp4Bound state.
@retval EFI_NOT_STARTED The EFI DHCPv4 Protocol driver is in the Dhcp4Stopped
state. EFI_DHCP4_PROTOCOL.Configure() needs to
be called.
@retval EFI_INVALID_PARAMETER This is NULL.
@retval EFI_TIMEOUT There was no response from the server when the try count was
exceeded.
@retval EFI_ACCESS_DENIED The driver is not in the Dhcp4Bound state.
@retval EFI_DEVICE_ERROR An unexpected system or network error occurred.
**/
EFI_STATUS
EFIAPI
EfiDhcp4RenewRebind (
IN EFI_DHCP4_PROTOCOL *This,
IN BOOLEAN RebindRequest,
IN EFI_EVENT CompletionEvent OPTIONAL
);
/**
Releases the current address configuration.
The Release() function releases the current configured IP address by doing either
of the following:
* Sending a DHCPRELEASE packet when the EFI DHCPv4 Protocol driver is in the
Dhcp4Bound state
* Setting the previously assigned IP address that was provided with the
EFI_DHCP4_PROTOCOL.Configure() function to 0.0.0.0 when the driver is in
Dhcp4InitReboot state
After a successful call to this function, the EFI DHCPv4 Protocol driver returns
to the Dhcp4Init state and any subsequent incoming packets will be discarded silently.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@retval EFI_SUCCESS The EFI DHCPv4 Protocol driver is now in the Dhcp4Init phase.
@retval EFI_INVALID_PARAMETER This is NULL.
@retval EFI_ACCESS_DENIED The EFI DHCPv4 Protocol driver is not Dhcp4InitReboot state.
@retval EFI_DEVICE_ERROR An unexpected system or network error occurred.
**/
EFI_STATUS
EFIAPI
EfiDhcp4Release (
IN EFI_DHCP4_PROTOCOL *This
);
/**
Stops the current address configuration.
The Stop() function is used to stop the DHCP configuration process. After this
function is called successfully, the EFI DHCPv4 Protocol driver is transferred
into the Dhcp4Stopped state. EFI_DHCP4_PROTOCOL.Configure() needs to be called
before DHCP configuration process can be started again. This function can be
called when the EFI DHCPv4 Protocol driver is in any state.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@retval EFI_SUCCESS The EFI DHCPv4 Protocol driver is now in the Dhcp4Stopped phase.
@retval EFI_INVALID_PARAMETER This is NULL.
**/
EFI_STATUS
EFIAPI
EfiDhcp4Stop (
IN EFI_DHCP4_PROTOCOL *This
);
/**
Builds a DHCP packet, given the options to be appended or deleted or replaced.
The Build() function is used to assemble a new packet from the original packet
by replacing or deleting existing options or appending new options. This function
does not change any state of the EFI DHCPv4 Protocol driver and can be used at
any time.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param[in] SeedPacket Initial packet to be used as a base for building new packet.
@param[in] DeleteCount Number of opcodes in the DeleteList.
@param[in] DeleteList List of opcodes to be deleted from the seed packet.
Ignored if DeleteCount is zero.
@param[in] AppendCount Number of entries in the OptionList.
@param[in] AppendList Pointer to a DHCP option list to be appended to SeedPacket.
If SeedPacket also contains options in this list, they are
replaced by new options (except pad option). Ignored if
AppendCount is zero. Type EFI_DHCP4_PACKET_OPTION
@param[out] NewPacket Pointer to storage for the pointer to the new allocated packet.
Use the EFI Boot Service FreePool() on the resulting pointer
when done with the packet.
@retval EFI_SUCCESS The new packet was built.
@retval EFI_OUT_OF_RESOURCES Storage for the new packet could not be allocated.
@retval EFI_INVALID_PARAMETER Some parameter is NULL.
**/
EFI_STATUS
EFIAPI
EfiDhcp4Build (
IN EFI_DHCP4_PROTOCOL *This,
IN EFI_DHCP4_PACKET *SeedPacket,
IN UINT32 DeleteCount,
IN UINT8 *DeleteList OPTIONAL,
IN UINT32 AppendCount,
IN EFI_DHCP4_PACKET_OPTION *AppendList[] OPTIONAL,
OUT EFI_DHCP4_PACKET **NewPacket
);
/**
Transmits a DHCP formatted packet and optionally waits for responses.
The TransmitReceive() function is used to transmit a DHCP packet and optionally
wait for the response from servers. This function does not change the state of
the EFI DHCPv4 Protocol driver and thus can be used at any time.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param[in] Token Pointer to the EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN structure.
@retval EFI_SUCCESS The packet was successfully queued for transmission.
@retval EFI_INVALID_PARAMETER Some parameter is NULL.
@retval EFI_NOT_READY The previous call to this function has not finished yet. Try to call
this function after collection process completes.
@retval EFI_NO_MAPPING The default station address is not available yet.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval Others Some other unexpected error occurred.
**/
EFI_STATUS
EFIAPI
EfiDhcp4TransmitReceive (
IN EFI_DHCP4_PROTOCOL *This,
IN EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN *Token
);
/**
Parses the packed DHCP option data.
The Parse() function is used to retrieve the option list from a DHCP packet.
If *OptionCount isn't zero, and there is enough space for all the DHCP options
in the Packet, each element of PacketOptionList is set to point to somewhere in
the Packet->Dhcp4.Option where a new DHCP option begins. If RFC3396 is supported,
the caller should reassemble the parsed DHCP options to get the finial result.
If *OptionCount is zero or there isn't enough space for all of them, the number
of DHCP options in the Packet is returned in OptionCount.
@param This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param Packet Pointer to packet to be parsed.
@param OptionCount On input, the number of entries in the PacketOptionList.
On output, the number of entries that were written into the
PacketOptionList.
@param PacketOptionList List of packet option entries to be filled in. End option or pad
options are not included.
@retval EFI_SUCCESS The packet was successfully parsed.
@retval EFI_INVALID_PARAMETER Some parameter is NULL.
@retval EFI_BUFFER_TOO_SMALL One or more of the following conditions is TRUE:
1) *OptionCount is smaller than the number of options that
were found in the Packet.
2) PacketOptionList is NULL.
**/
EFI_STATUS
EFIAPI
EfiDhcp4Parse (
IN EFI_DHCP4_PROTOCOL *This,
IN EFI_DHCP4_PACKET *Packet,
IN OUT UINT32 *OptionCount,
OUT EFI_DHCP4_PACKET_OPTION *PacketOptionList[] OPTIONAL
);
EFI_DHCP4_PROTOCOL mDhcp4ProtocolTemplate = {
EfiDhcp4GetModeData,
EfiDhcp4Configure,
EfiDhcp4Start,
EfiDhcp4RenewRebind,
EfiDhcp4Release,
EfiDhcp4Stop,
EfiDhcp4Build,
EfiDhcp4TransmitReceive,
EfiDhcp4Parse
};
/**
Returns the current operating mode and cached data packet for the EFI DHCPv4 Protocol driver.
The GetModeData() function returns the current operating mode and cached data
packet for the EFI DHCPv4 Protocol driver.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param[out] Dhcp4ModeData Pointer to storage for the EFI_DHCP4_MODE_DATA structure.
@retval EFI_SUCCESS The mode data was returned.
@retval EFI_INVALID_PARAMETER This is NULL.
**/
EFI_STATUS
EFIAPI
EfiDhcp4GetModeData (
IN EFI_DHCP4_PROTOCOL *This,
OUT EFI_DHCP4_MODE_DATA *Dhcp4ModeData
)
{
DHCP_PROTOCOL *Instance;
DHCP_SERVICE *DhcpSb;
DHCP_PARAMETER *Para;
EFI_TPL OldTpl;
IP4_ADDR Ip;
//
// First validate the parameters.
//
if ((This == NULL) || (Dhcp4ModeData == NULL)) {
return EFI_INVALID_PARAMETER;
}
Instance = DHCP_INSTANCE_FROM_THIS (This);
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
DhcpSb = Instance->Service;
//
// Caller can use GetModeData to retrieve current DHCP states
// no matter whether it is the active child or not.
//
Dhcp4ModeData->State = (EFI_DHCP4_STATE) DhcpSb->DhcpState;
CopyMem (&Dhcp4ModeData->ConfigData, &DhcpSb->ActiveConfig, sizeof (Dhcp4ModeData->ConfigData));
CopyMem (&Dhcp4ModeData->ClientMacAddress, &DhcpSb->Mac, sizeof (Dhcp4ModeData->ClientMacAddress));
Ip = HTONL (DhcpSb->ClientAddr);
CopyMem (&Dhcp4ModeData->ClientAddress, &Ip, sizeof (EFI_IPv4_ADDRESS));
Ip = HTONL (DhcpSb->Netmask);
CopyMem (&Dhcp4ModeData->SubnetMask, &Ip, sizeof (EFI_IPv4_ADDRESS));
Ip = HTONL (DhcpSb->ServerAddr);
CopyMem (&Dhcp4ModeData->ServerAddress, &Ip, sizeof (EFI_IPv4_ADDRESS));
Para = DhcpSb->Para;
if (Para != NULL) {
Ip = HTONL (Para->Router);
CopyMem (&Dhcp4ModeData->RouterAddress, &Ip, sizeof (EFI_IPv4_ADDRESS));
Dhcp4ModeData->LeaseTime = Para->Lease;
} else {
ZeroMem (&Dhcp4ModeData->RouterAddress, sizeof (EFI_IPv4_ADDRESS));
Dhcp4ModeData->LeaseTime = 0xffffffff;
}
Dhcp4ModeData->ReplyPacket = DhcpSb->Selected;
gBS->RestoreTPL (OldTpl);
return EFI_SUCCESS;
}
/**
Free the resource related to the configure parameters.
DHCP driver will make a copy of the user's configure
such as the time out value.
@param Config The DHCP configure data
**/
VOID
DhcpCleanConfigure (
IN OUT EFI_DHCP4_CONFIG_DATA *Config
)
{
UINT32 Index;
if (Config->DiscoverTimeout != NULL) {
gBS->FreePool (Config->DiscoverTimeout);
}
if (Config->RequestTimeout != NULL) {
gBS->FreePool (Config->RequestTimeout);
}
if (Config->OptionList != NULL) {
for (Index = 0; Index < Config->OptionCount; Index++) {
if (Config->OptionList[Index] != NULL) {
gBS->FreePool (Config->OptionList[Index]);
}
}
gBS->FreePool (Config->OptionList);
}
ZeroMem (Config, sizeof (EFI_DHCP4_CONFIG_DATA));
}
/**
Allocate memory for configure parameter such as timeout value for Dst,
then copy the configure parameter from Src to Dst.
@param[out] Dst The destination DHCP configure data.
@param[in] Src The source DHCP configure data.
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
@retval EFI_SUCCESS The configure is copied.
**/
EFI_STATUS
DhcpCopyConfigure (
OUT EFI_DHCP4_CONFIG_DATA *Dst,
IN EFI_DHCP4_CONFIG_DATA *Src
)
{
EFI_DHCP4_PACKET_OPTION **DstOptions;
EFI_DHCP4_PACKET_OPTION **SrcOptions;
INTN Len;
UINT32 Index;
CopyMem (Dst, Src, sizeof (*Dst));
Dst->DiscoverTimeout = NULL;
Dst->RequestTimeout = NULL;
Dst->OptionList = NULL;
//
// Allocate a memory then copy DiscoverTimeout to it
//
if (Src->DiscoverTimeout != NULL) {
Len = Src->DiscoverTryCount * sizeof (UINT32);
Dst->DiscoverTimeout = AllocatePool (Len);
if (Dst->DiscoverTimeout == NULL) {
return EFI_OUT_OF_RESOURCES;
}
for (Index = 0; Index < Src->DiscoverTryCount; Index++) {
Dst->DiscoverTimeout[Index] = MAX (Src->DiscoverTimeout[Index], 1);
}
}
//
// Allocate a memory then copy RequestTimeout to it
//
if (Src->RequestTimeout != NULL) {
Len = Src->RequestTryCount * sizeof (UINT32);
Dst->RequestTimeout = AllocatePool (Len);
if (Dst->RequestTimeout == NULL) {
goto ON_ERROR;
}
for (Index = 0; Index < Src->RequestTryCount; Index++) {
Dst->RequestTimeout[Index] = MAX (Src->RequestTimeout[Index], 1);
}
}
//
// Allocate an array of dhcp option point, then allocate memory
// for each option and copy the source option to it
//
if (Src->OptionList != NULL) {
Len = Src->OptionCount * sizeof (EFI_DHCP4_PACKET_OPTION *);
Dst->OptionList = AllocateZeroPool (Len);
if (Dst->OptionList == NULL) {
goto ON_ERROR;
}
DstOptions = Dst->OptionList;
SrcOptions = Src->OptionList;
for (Index = 0; Index < Src->OptionCount; Index++) {
Len = sizeof (EFI_DHCP4_PACKET_OPTION) + MAX (SrcOptions[Index]->Length - 1, 0);
DstOptions[Index] = AllocatePool (Len);
if (DstOptions[Index] == NULL) {
goto ON_ERROR;
}
CopyMem (DstOptions[Index], SrcOptions[Index], Len);
}
}
return EFI_SUCCESS;
ON_ERROR:
DhcpCleanConfigure (Dst);
return EFI_OUT_OF_RESOURCES;
}
/**
Give up the control of the DHCP service to let other child
resume. Don't change the service's DHCP state and the Client
address and option list configure as required by RFC2131.
@param DhcpSb The DHCP service instance.
**/
VOID
DhcpYieldControl (
IN DHCP_SERVICE *DhcpSb
)
{
EFI_DHCP4_CONFIG_DATA *Config;
Config = &DhcpSb->ActiveConfig;
DhcpSb->ServiceState = DHCP_UNCONFIGED;
DhcpSb->ActiveChild = NULL;
if (Config->DiscoverTimeout != NULL) {
gBS->FreePool (Config->DiscoverTimeout);
Config->DiscoverTryCount = 0;
Config->DiscoverTimeout = NULL;
}
if (Config->RequestTimeout != NULL) {
gBS->FreePool (Config->RequestTimeout);
Config->RequestTryCount = 0;
Config->RequestTimeout = NULL;
}
Config->Dhcp4Callback = NULL;
Config->CallbackContext = NULL;
}
/**
Initializes, changes, or resets the operational settings for the EFI DHCPv4 Protocol driver.
The Configure() function is used to initialize, change, or reset the operational
settings of the EFI DHCPv4 Protocol driver for the communication device on which
the EFI DHCPv4 Service Binding Protocol is installed. This function can be
successfully called only if both of the following are true:
* This instance of the EFI DHCPv4 Protocol driver is in the Dhcp4Stopped, Dhcp4Init,
Dhcp4InitReboot, or Dhcp4Bound states.
* No other EFI DHCPv4 Protocol driver instance that is controlled by this EFI
DHCPv4 Service Binding Protocol driver instance has configured this EFI DHCPv4
Protocol driver.
When this driver is in the Dhcp4Stopped state, it can transfer into one of the
following two possible initial states:
* Dhcp4Init
* Dhcp4InitReboot
The driver can transfer into these states by calling Configure() with a non-NULL
Dhcp4CfgData. The driver will transfer into the appropriate state based on the
supplied client network address in the ClientAddress parameter and DHCP options
in the OptionList parameter as described in RFC 2131.
When Configure() is called successfully while Dhcp4CfgData is set to NULL, the
default configuring data will be reset in the EFI DHCPv4 Protocol driver and
the state of the EFI DHCPv4 Protocol driver will not be changed. If one instance
wants to make it possible for another instance to configure the EFI DHCPv4 Protocol
driver, it must call this function with Dhcp4CfgData set to NULL.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param[in] Dhcp4CfgData Pointer to the EFI_DHCP4_CONFIG_DATA.
@retval EFI_SUCCESS The EFI DHCPv4 Protocol driver is now in the Dhcp4Init or
Dhcp4InitReboot state, if the original state of this driver
was Dhcp4Stopped and the value of Dhcp4CfgData was
not NULL. Otherwise, the state was left unchanged.
@retval EFI_ACCESS_DENIED This instance of the EFI DHCPv4 Protocol driver was not in the
Dhcp4Stopped, Dhcp4Init, Dhcp4InitReboot, or Dhcp4Bound state;
Or onother instance of this EFI DHCPv4 Protocol driver is already
in a valid configured state.
@retval EFI_INVALID_PARAMETER Some parameter is NULL.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval EFI_DEVICE_ERROR An unexpected system or network error occurred.
**/
EFI_STATUS
EFIAPI
EfiDhcp4Configure (
IN EFI_DHCP4_PROTOCOL *This,
IN EFI_DHCP4_CONFIG_DATA *Dhcp4CfgData OPTIONAL
)
{
EFI_DHCP4_CONFIG_DATA *Config;
DHCP_PROTOCOL *Instance;
DHCP_SERVICE *DhcpSb;
EFI_STATUS Status;
EFI_TPL OldTpl;
UINT32 Index;
IP4_ADDR Ip;
//
// First validate the parameters
//
if (This == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Dhcp4CfgData != NULL) {
if (Dhcp4CfgData->DiscoverTryCount && (Dhcp4CfgData->DiscoverTimeout == NULL)) {
return EFI_INVALID_PARAMETER;
}
if (Dhcp4CfgData->RequestTryCount && (Dhcp4CfgData->RequestTimeout == NULL)) {
return EFI_INVALID_PARAMETER;
}
if (Dhcp4CfgData->OptionCount && (Dhcp4CfgData->OptionList == NULL)) {
return EFI_INVALID_PARAMETER;
}
CopyMem (&Ip, &Dhcp4CfgData->ClientAddress, sizeof (IP4_ADDR));
if ((Ip != 0) && !Ip4IsUnicast (NTOHL (Ip), 0)) {
return EFI_INVALID_PARAMETER;
}
}
Instance = DHCP_INSTANCE_FROM_THIS (This);
if (Instance->Signature != DHCP_PROTOCOL_SIGNATURE) {
return EFI_INVALID_PARAMETER;
}
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
DhcpSb = Instance->Service;
Config = &DhcpSb->ActiveConfig;
Status = EFI_ACCESS_DENIED;
if ((DhcpSb->DhcpState != Dhcp4Stopped) &&
(DhcpSb->DhcpState != Dhcp4Init) &&
(DhcpSb->DhcpState != Dhcp4InitReboot) &&
(DhcpSb->DhcpState != Dhcp4Bound)) {
goto ON_EXIT;
}
if ((DhcpSb->ActiveChild != NULL) && (DhcpSb->ActiveChild != Instance)) {
goto ON_EXIT;
}
if (Dhcp4CfgData != NULL) {
Status = EFI_OUT_OF_RESOURCES;
DhcpCleanConfigure (Config);
if (EFI_ERROR (DhcpCopyConfigure (Config, Dhcp4CfgData))) {
goto ON_EXIT;
}
DhcpSb->UserOptionLen = 0;
for (Index = 0; Index < Dhcp4CfgData->OptionCount; Index++) {
DhcpSb->UserOptionLen += Dhcp4CfgData->OptionList[Index]->Length + 2;
}
DhcpSb->ActiveChild = Instance;
if (DhcpSb->DhcpState == Dhcp4Stopped) {
DhcpSb->ClientAddr = EFI_NTOHL (Dhcp4CfgData->ClientAddress);
if (DhcpSb->ClientAddr != 0) {
DhcpSb->DhcpState = Dhcp4InitReboot;
} else {
DhcpSb->DhcpState = Dhcp4Init;
}
}
DhcpSb->ServiceState = DHCP_CONFIGED;
Status = EFI_SUCCESS;
} else if (DhcpSb->ActiveChild == Instance) {
Status = EFI_SUCCESS;
DhcpYieldControl (DhcpSb);
}
ON_EXIT:
gBS->RestoreTPL (OldTpl);
return Status;
}
/**
Starts the DHCP configuration process.
The Start() function starts the DHCP configuration process. This function can
be called only when the EFI DHCPv4 Protocol driver is in the Dhcp4Init or
Dhcp4InitReboot state.
If the DHCP process completes successfully, the state of the EFI DHCPv4 Protocol
driver will be transferred through Dhcp4Selecting and Dhcp4Requesting to the
Dhcp4Bound state. The CompletionEvent will then be signaled if it is not NULL.
If the process aborts, either by the user or by some unexpected network error,
the state is restored to the Dhcp4Init state. The Start() function can be called
again to restart the process.
Refer to RFC 2131 for precise state transitions during this process. At the
time when each event occurs in this process, the callback function that was set
by EFI_DHCP4_PROTOCOL.Configure() will be called and the user can take this
opportunity to control the process.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param[in] CompletionEvent If not NULL, indicates the event that will be signaled when the
EFI DHCPv4 Protocol driver is transferred into the
Dhcp4Bound state or when the DHCP process is aborted.
EFI_DHCP4_PROTOCOL.GetModeData() can be called to
check the completion status. If NULL,
EFI_DHCP4_PROTOCOL.Start() will wait until the driver
is transferred into the Dhcp4Bound state or the process fails.
@retval EFI_SUCCESS The DHCP configuration process has started, or it has completed
when CompletionEvent is NULL.
@retval EFI_NOT_STARTED The EFI DHCPv4 Protocol driver is in the Dhcp4Stopped
state. EFI_DHCP4_PROTOCOL. Configure() needs to be called.
@retval EFI_INVALID_PARAMETER This is NULL.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval EFI_TIMEOUT The DHCP configuration process failed because no response was
received from the server within the specified timeout value.
@retval EFI_ABORTED The user aborted the DHCP process.
@retval EFI_ALREADY_STARTED Some other EFI DHCPv4 Protocol instance already started the
DHCP process.
@retval EFI_DEVICE_ERROR An unexpected system or network error occurred.
**/
EFI_STATUS
EFIAPI
EfiDhcp4Start (
IN EFI_DHCP4_PROTOCOL *This,
IN EFI_EVENT CompletionEvent OPTIONAL
)
{
DHCP_PROTOCOL *Instance;
DHCP_SERVICE *DhcpSb;
EFI_STATUS Status;
EFI_TPL OldTpl;
//
// First validate the parameters
//
if (This == NULL) {
return EFI_INVALID_PARAMETER;
}
Instance = DHCP_INSTANCE_FROM_THIS (This);
if (Instance->Signature != DHCP_PROTOCOL_SIGNATURE) {
return EFI_INVALID_PARAMETER;
}
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
DhcpSb = Instance->Service;
if (DhcpSb->DhcpState == Dhcp4Stopped) {
Status = EFI_NOT_STARTED;
goto ON_ERROR;
}
if ((DhcpSb->DhcpState != Dhcp4Init) && (DhcpSb->DhcpState != Dhcp4InitReboot)) {
Status = EFI_ALREADY_STARTED;
goto ON_ERROR;
}
DhcpSb->IoStatus = EFI_ALREADY_STARTED;
if (EFI_ERROR (Status = DhcpInitRequest (DhcpSb))) {
goto ON_ERROR;
}
//
// Start/Restart the receiving.
//
Status = UdpIoRecvDatagram (DhcpSb->UdpIo, DhcpInput, DhcpSb, 0);
if (EFI_ERROR (Status) && (Status != EFI_ALREADY_STARTED)) {
goto ON_ERROR;
}
Instance->CompletionEvent = CompletionEvent;
//
// Restore the TPL now, don't call poll function at TPL_CALLBACK.
//
gBS->RestoreTPL (OldTpl);
if (CompletionEvent == NULL) {
while (DhcpSb->IoStatus == EFI_ALREADY_STARTED) {
DhcpSb->UdpIo->Udp->Poll (DhcpSb->UdpIo->Udp);
}
return DhcpSb->IoStatus;
}
return EFI_SUCCESS;
ON_ERROR:
gBS->RestoreTPL (OldTpl);
return Status;
}
/**
Extends the lease time by sending a request packet.
The RenewRebind() function is used to manually extend the lease time when the
EFI DHCPv4 Protocol driver is in the Dhcp4Bound state and the lease time has
not expired yet. This function will send a request packet to the previously
found server (or to any server when RebindRequest is TRUE) and transfer the
state into the Dhcp4Renewing state (or Dhcp4Rebinding when RebindingRequest is
TRUE). When a response is received, the state is returned to Dhcp4Bound.
If no response is received before the try count is exceeded (the RequestTryCount
field that is specified in EFI_DHCP4_CONFIG_DATA) but before the lease time that
was issued by the previous server expires, the driver will return to the Dhcp4Bound
state and the previous configuration is restored. The outgoing and incoming packets
can be captured by the EFI_DHCP4_CALLBACK function.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param[in] RebindRequest If TRUE, this function broadcasts the request packets and enters
the Dhcp4Rebinding state. Otherwise, it sends a unicast
request packet and enters the Dhcp4Renewing state.
@param[in] CompletionEvent If not NULL, this event is signaled when the renew/rebind phase
completes or some error occurs.
EFI_DHCP4_PROTOCOL.GetModeData() can be called to
check the completion status. If NULL,
EFI_DHCP4_PROTOCOL.RenewRebind() will busy-wait
until the DHCP process finishes.
@retval EFI_SUCCESS The EFI DHCPv4 Protocol driver is now in the
Dhcp4Renewing state or is back to the Dhcp4Bound state.
@retval EFI_NOT_STARTED The EFI DHCPv4 Protocol driver is in the Dhcp4Stopped
state. EFI_DHCP4_PROTOCOL.Configure() needs to
be called.
@retval EFI_INVALID_PARAMETER This is NULL.
@retval EFI_TIMEOUT There was no response from the server when the try count was
exceeded.
@retval EFI_ACCESS_DENIED The driver is not in the Dhcp4Bound state.
@retval EFI_DEVICE_ERROR An unexpected system or network error occurred.
**/
EFI_STATUS
EFIAPI
EfiDhcp4RenewRebind (
IN EFI_DHCP4_PROTOCOL *This,
IN BOOLEAN RebindRequest,
IN EFI_EVENT CompletionEvent OPTIONAL
)
{
DHCP_PROTOCOL *Instance;
DHCP_SERVICE *DhcpSb;
EFI_STATUS Status;
EFI_TPL OldTpl;
//
// First validate the parameters
//
if (This == NULL) {
return EFI_INVALID_PARAMETER;
}
Instance = DHCP_INSTANCE_FROM_THIS (This);
if (Instance->Signature != DHCP_PROTOCOL_SIGNATURE) {
return EFI_INVALID_PARAMETER;
}
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
DhcpSb = Instance->Service;
if (DhcpSb->DhcpState == Dhcp4Stopped) {
Status = EFI_NOT_STARTED;
goto ON_ERROR;
}
if (DhcpSb->DhcpState != Dhcp4Bound) {
Status = EFI_ACCESS_DENIED;
goto ON_ERROR;
}
if (DHCP_IS_BOOTP (DhcpSb->Para)) {
return EFI_SUCCESS;
}
//
// Transit the states then send a extra DHCP request
//
if (!RebindRequest) {
DhcpSetState (DhcpSb, Dhcp4Renewing, FALSE);
} else {
DhcpSetState (DhcpSb, Dhcp4Rebinding, FALSE);
}
Status = DhcpSendMessage (
DhcpSb,
DhcpSb->Selected,
DhcpSb->Para,
DHCP_MSG_REQUEST,
(UINT8 *) "Extra renew/rebind by the application"
);
if (EFI_ERROR (Status)) {
DhcpSetState (DhcpSb, Dhcp4Bound, FALSE);
goto ON_ERROR;
}
DhcpSb->ExtraRefresh = TRUE;
DhcpSb->IoStatus = EFI_ALREADY_STARTED;
Instance->RenewRebindEvent = CompletionEvent;
gBS->RestoreTPL (OldTpl);
if (CompletionEvent == NULL) {
while (DhcpSb->IoStatus == EFI_ALREADY_STARTED) {
DhcpSb->UdpIo->Udp->Poll (DhcpSb->UdpIo->Udp);
}
return DhcpSb->IoStatus;
}
return EFI_SUCCESS;
ON_ERROR:
gBS->RestoreTPL (OldTpl);
return Status;
}
/**
Releases the current address configuration.
The Release() function releases the current configured IP address by doing either
of the following:
* Sending a DHCPRELEASE packet when the EFI DHCPv4 Protocol driver is in the
Dhcp4Bound state
* Setting the previously assigned IP address that was provided with the
EFI_DHCP4_PROTOCOL.Configure() function to 0.0.0.0 when the driver is in
Dhcp4InitReboot state
After a successful call to this function, the EFI DHCPv4 Protocol driver returns
to the Dhcp4Init state and any subsequent incoming packets will be discarded silently.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@retval EFI_SUCCESS The EFI DHCPv4 Protocol driver is now in the Dhcp4Init phase.
@retval EFI_INVALID_PARAMETER This is NULL.
@retval EFI_ACCESS_DENIED The EFI DHCPv4 Protocol driver is not Dhcp4InitReboot state.
@retval EFI_DEVICE_ERROR An unexpected system or network error occurred.
**/
EFI_STATUS
EFIAPI
EfiDhcp4Release (
IN EFI_DHCP4_PROTOCOL *This
)
{
DHCP_PROTOCOL *Instance;
DHCP_SERVICE *DhcpSb;
EFI_STATUS Status;
EFI_TPL OldTpl;
//
// First validate the parameters
//
if (This == NULL) {
return EFI_INVALID_PARAMETER;
}
Instance = DHCP_INSTANCE_FROM_THIS (This);
if (Instance->Signature != DHCP_PROTOCOL_SIGNATURE) {
return EFI_INVALID_PARAMETER;
}
Status = EFI_SUCCESS;
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
DhcpSb = Instance->Service;
if ((DhcpSb->DhcpState != Dhcp4InitReboot) && (DhcpSb->DhcpState != Dhcp4Bound)) {
Status = EFI_ACCESS_DENIED;
goto ON_EXIT;
}
if (!DHCP_IS_BOOTP (DhcpSb->Para) && (DhcpSb->DhcpState == Dhcp4Bound)) {
Status = DhcpSendMessage (
DhcpSb,
DhcpSb->Selected,
DhcpSb->Para,
DHCP_MSG_RELEASE,
NULL
);
if (EFI_ERROR (Status)) {
Status = EFI_DEVICE_ERROR;
goto ON_EXIT;
}
}
DhcpCleanLease (DhcpSb);
ON_EXIT:
gBS->RestoreTPL (OldTpl);
return Status;
}
/**
Stops the current address configuration.
The Stop() function is used to stop the DHCP configuration process. After this
function is called successfully, the EFI DHCPv4 Protocol driver is transferred
into the Dhcp4Stopped state. EFI_DHCP4_PROTOCOL.Configure() needs to be called
before DHCP configuration process can be started again. This function can be
called when the EFI DHCPv4 Protocol driver is in any state.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@retval EFI_SUCCESS The EFI DHCPv4 Protocol driver is now in the Dhcp4Stopped phase.
@retval EFI_INVALID_PARAMETER This is NULL.
**/
EFI_STATUS
EFIAPI
EfiDhcp4Stop (
IN EFI_DHCP4_PROTOCOL *This
)
{
DHCP_PROTOCOL *Instance;
DHCP_SERVICE *DhcpSb;
EFI_TPL OldTpl;
//
// First validate the parameters
//
if (This == NULL) {
return EFI_INVALID_PARAMETER;
}
Instance = DHCP_INSTANCE_FROM_THIS (This);
if (Instance->Signature != DHCP_PROTOCOL_SIGNATURE) {
return EFI_INVALID_PARAMETER;
}
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
DhcpSb = Instance->Service;
DhcpCleanLease (DhcpSb);
DhcpSb->DhcpState = Dhcp4Stopped;
DhcpSb->ServiceState = DHCP_UNCONFIGED;
gBS->RestoreTPL (OldTpl);
return EFI_SUCCESS;
}
/**
Builds a DHCP packet, given the options to be appended or deleted or replaced.
The Build() function is used to assemble a new packet from the original packet
by replacing or deleting existing options or appending new options. This function
does not change any state of the EFI DHCPv4 Protocol driver and can be used at
any time.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param[in] SeedPacket Initial packet to be used as a base for building new packet.
@param[in] DeleteCount Number of opcodes in the DeleteList.
@param[in] DeleteList List of opcodes to be deleted from the seed packet.
Ignored if DeleteCount is zero.
@param[in] AppendCount Number of entries in the OptionList.
@param[in] AppendList Pointer to a DHCP option list to be appended to SeedPacket.
If SeedPacket also contains options in this list, they are
replaced by new options (except pad option). Ignored if
AppendCount is zero. Type EFI_DHCP4_PACKET_OPTION
@param[out] NewPacket Pointer to storage for the pointer to the new allocated packet.
Use the EFI Boot Service FreePool() on the resulting pointer
when done with the packet.
@retval EFI_SUCCESS The new packet was built.
@retval EFI_OUT_OF_RESOURCES Storage for the new packet could not be allocated.
@retval EFI_INVALID_PARAMETER Some parameter is NULL.
**/
EFI_STATUS
EFIAPI
EfiDhcp4Build (
IN EFI_DHCP4_PROTOCOL *This,
IN EFI_DHCP4_PACKET *SeedPacket,
IN UINT32 DeleteCount,
IN UINT8 *DeleteList OPTIONAL,
IN UINT32 AppendCount,
IN EFI_DHCP4_PACKET_OPTION *AppendList[] OPTIONAL,
OUT EFI_DHCP4_PACKET **NewPacket
)
{
//
// First validate the parameters
//
if ((This == NULL) || (NewPacket == NULL)) {
return EFI_INVALID_PARAMETER;
}
if ((SeedPacket == NULL) || (SeedPacket->Dhcp4.Magik != DHCP_OPTION_MAGIC) ||
EFI_ERROR (DhcpValidateOptions (SeedPacket, NULL))) {
return EFI_INVALID_PARAMETER;
}
if (((DeleteCount == 0) && (AppendCount == 0)) ||
((DeleteCount != 0) && (DeleteList == NULL)) ||
((AppendCount != 0) && (AppendList == NULL))) {
return EFI_INVALID_PARAMETER;
}
return DhcpBuild (
SeedPacket,
DeleteCount,
DeleteList,
AppendCount,
AppendList,
NewPacket
);
}
/**
Callback by UdpIoCreatePort() when creating UdpIo for this Dhcp4 instance.
@param[in] UdpIo The UdpIo being created.
@param[in] Context Dhcp4 instance.
@retval EFI_SUCCESS UdpIo is configured successfully.
@retval other Other error occurs.
**/
EFI_STATUS
Dhcp4InstanceConfigUdpIo (
IN UDP_IO_PORT *UdpIo,
IN VOID *Context
)
{
DHCP_PROTOCOL *Instance;
DHCP_SERVICE *DhcpSb;
EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN *Token;
EFI_UDP4_CONFIG_DATA UdpConfigData;
IP4_ADDR Ip;
Instance = (DHCP_PROTOCOL *) Context;
DhcpSb = Instance->Service;
Token = Instance->Token;
ZeroMem (&UdpConfigData, sizeof (EFI_UDP4_CONFIG_DATA));
UdpConfigData.AcceptBroadcast = TRUE;
UdpConfigData.AllowDuplicatePort = TRUE;
UdpConfigData.TimeToLive = 64;
UdpConfigData.DoNotFragment = TRUE;
Ip = HTONL (DhcpSb->ClientAddr);
CopyMem (&UdpConfigData.StationAddress, &Ip, sizeof (EFI_IPv4_ADDRESS));
Ip = HTONL (DhcpSb->Netmask);
CopyMem (&UdpConfigData.SubnetMask, &Ip, sizeof (EFI_IPv4_ADDRESS));
if ((Token->ListenPointCount == 0) || (Token->ListenPoints[0].ListenPort == 0)) {
UdpConfigData.StationPort = DHCP_CLIENT_PORT;
} else {
UdpConfigData.StationPort = Token->ListenPoints[0].ListenPort;
}
return UdpIo->Udp->Configure (UdpIo->Udp, &UdpConfigData);
}
/**
Create UdpIo for this Dhcp4 instance.
@param Instance The Dhcp4 instance.
@retval EFI_SUCCESS UdpIo is created successfully.
@retval EFI_OUT_OF_RESOURCES Fails to create UdpIo because of limited
resources or configuration failure.
**/
EFI_STATUS
Dhcp4InstanceCreateUdpIo (
IN OUT DHCP_PROTOCOL *Instance
)
{
DHCP_SERVICE *DhcpSb;
ASSERT (Instance->Token != NULL);
DhcpSb = Instance->Service;
Instance->UdpIo = UdpIoCreatePort (DhcpSb->Controller, DhcpSb->Image, Dhcp4InstanceConfigUdpIo, Instance);
if (Instance->UdpIo == NULL) {
return EFI_OUT_OF_RESOURCES;
} else {
return EFI_SUCCESS;
}
}
/**
Callback of Dhcp packet. Does nothing.
@param Arg The context.
**/
VOID
DhcpDummyExtFree (
IN VOID *Arg
)
{
}
/**
Callback of UdpIoRecvDatagram() that handles a Dhcp4 packet.
Only BOOTP responses will be handled that correspond to the Xid of the request
sent out. The packet will be queued to the response queue.
@param UdpPacket The Dhcp4 packet.
@param Points Udp4 address pair.
@param IoStatus Status of the input.
@param Context Extra info for the input.
**/
VOID
PxeDhcpInput (
NET_BUF *UdpPacket,
UDP_POINTS *Points,
EFI_STATUS IoStatus,
VOID *Context
)
{
DHCP_PROTOCOL *Instance;
DHCP_SERVICE *DhcpSb;
EFI_DHCP4_HEADER *Head;
NET_BUF *Wrap;
EFI_DHCP4_PACKET *Packet;
EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN *Token;
UINT32 Len;
EFI_STATUS Status;
Wrap = NULL;
Instance = (DHCP_PROTOCOL *) Context;
Token = Instance->Token;
DhcpSb = Instance->Service;
//
// Don't restart receive if error occurs or DHCP is destroyed.
//
if (EFI_ERROR (IoStatus)) {
return ;
}
ASSERT (UdpPacket != NULL);
//
// Validate the packet received
//
if (UdpPacket->TotalSize < sizeof (EFI_DHCP4_HEADER)) {
goto RESTART;
}
//
// Copy the DHCP message to a continuous memory block, make the buffer size
// of the EFI_DHCP4_PACKET a multiple of 4-byte.
//
Len = NET_ROUNDUP (sizeof (EFI_DHCP4_PACKET) + UdpPacket->TotalSize - sizeof (EFI_DHCP4_HEADER), 4);
Wrap = NetbufAlloc (Len);
if (Wrap == NULL) {
goto RESTART;
}
Packet = (EFI_DHCP4_PACKET *) NetbufAllocSpace (Wrap, Len, NET_BUF_TAIL);
Packet->Size = Len;
Head = &Packet->Dhcp4.Header;
Packet->Length = NetbufCopy (UdpPacket, 0, UdpPacket->TotalSize, (UINT8 *) Head);
if (Packet->Length != UdpPacket->TotalSize) {
goto RESTART;
}
//
// Is this packet the answer to our packet?
//
if ((Head->OpCode != BOOTP_REPLY) ||
(Head->Xid != Token->Packet->Dhcp4.Header.Xid) ||
(CompareMem (DhcpSb->ClientAddressSendOut, Head->ClientHwAddr, Head->HwAddrLen) != 0)) {
goto RESTART;
}
//
// Validate the options and retrieve the interested options
//
if ((Packet->Length > sizeof (EFI_DHCP4_HEADER) + sizeof (UINT32)) &&
(Packet->Dhcp4.Magik == DHCP_OPTION_MAGIC) &&
EFI_ERROR (DhcpValidateOptions (Packet, NULL))) {
goto RESTART;
}
//
// Keep this packet in the ResponseQueue.
//
NET_GET_REF (Wrap);
NetbufQueAppend (&Instance->ResponseQueue, Wrap);
RESTART:
NetbufFree (UdpPacket);
if (Wrap != NULL) {
NetbufFree (Wrap);
}
Status = UdpIoRecvDatagram (Instance->UdpIo, PxeDhcpInput, Instance, 0);
if (EFI_ERROR (Status)) {
PxeDhcpDone (Instance);
}
}
/**
Complete a Dhcp4 transaction and signal the upper layer.
@param Instance Dhcp4 instance.
**/
VOID
PxeDhcpDone (
IN DHCP_PROTOCOL *Instance
)
{
EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN *Token;
Token = Instance->Token;
Token->ResponseCount = Instance->ResponseQueue.BufNum;
if (Token->ResponseCount != 0) {
Token->ResponseList = (EFI_DHCP4_PACKET *) AllocatePool (Instance->ResponseQueue.BufSize);
if (Token->ResponseList == NULL) {
Token->Status = EFI_OUT_OF_RESOURCES;
goto SIGNAL_USER;
}
//
// Copy the received DHCP responses.
//
NetbufQueCopy (&Instance->ResponseQueue, 0, Instance->ResponseQueue.BufSize, (UINT8 *) Token->ResponseList);
Token->Status = EFI_SUCCESS;
} else {
Token->ResponseList = NULL;
Token->Status = EFI_TIMEOUT;
}
SIGNAL_USER:
//
// Clean up the resources dedicated for this transmit receive transaction.
//
NetbufQueFlush (&Instance->ResponseQueue);
UdpIoCleanPort (Instance->UdpIo);
UdpIoFreePort (Instance->UdpIo);
Instance->UdpIo = NULL;
Instance->Token = NULL;
if (Token->CompletionEvent != NULL) {
gBS->SignalEvent (Token->CompletionEvent);
}
}
/**
Transmits a DHCP formatted packet and optionally waits for responses.
The TransmitReceive() function is used to transmit a DHCP packet and optionally
wait for the response from servers. This function does not change the state of
the EFI DHCPv4 Protocol driver and thus can be used at any time.
@param[in] This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param[in] Token Pointer to the EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN structure.
@retval EFI_SUCCESS The packet was successfully queued for transmission.
@retval EFI_INVALID_PARAMETER Some parameter is NULL.
@retval EFI_NOT_READY The previous call to this function has not finished yet. Try to call
this function after collection process completes.
@retval EFI_NO_MAPPING The default station address is not available yet.
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.
@retval Others Some other unexpected error occurred.
**/
EFI_STATUS
EFIAPI
EfiDhcp4TransmitReceive (
IN EFI_DHCP4_PROTOCOL *This,
IN EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN *Token
)
{
DHCP_PROTOCOL *Instance;
EFI_TPL OldTpl;
EFI_STATUS Status;
NET_FRAGMENT Frag;
NET_BUF *Wrap;
UDP_POINTS EndPoint;
IP4_ADDR Ip;
DHCP_SERVICE *DhcpSb;
IP4_ADDR Gateway;
IP4_ADDR SubnetMask;
if ((This == NULL) || (Token == NULL) || (Token->Packet == NULL)) {
return EFI_INVALID_PARAMETER;
}
Instance = DHCP_INSTANCE_FROM_THIS (This);
DhcpSb = Instance->Service;
if (Instance->Token != NULL) {
//
// The previous call to TransmitReceive is not finished.
//
return EFI_NOT_READY;
}
if ((Token->Packet->Dhcp4.Magik != DHCP_OPTION_MAGIC) ||
(NTOHL (Token->Packet->Dhcp4.Header.Xid) == Instance->Service->Xid) ||
(Token->TimeoutValue == 0) ||
((Token->ListenPointCount != 0) && (Token->ListenPoints == NULL)) ||
EFI_ERROR (DhcpValidateOptions (Token->Packet, NULL)) ||
EFI_IP4_EQUAL (&Token->RemoteAddress, &mZeroIp4Addr)
) {
//
// The DHCP packet isn't well-formed, the Transaction ID is already used,
// the timeout value is zero, the ListenPoint is invalid, or the
// RemoteAddress is zero.
//
return EFI_INVALID_PARAMETER;
}
if (DhcpSb->ClientAddr == 0) {
return EFI_NO_MAPPING;
}
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
//
// Save the token and the timeout value.
//
Instance->Token = Token;
Instance->Timeout = Token->TimeoutValue;
//
// Create a UDP IO for this transmit receive transaction.
//
Status = Dhcp4InstanceCreateUdpIo (Instance);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
//
// Save the Client Address is sent out
//
CopyMem (
&DhcpSb->ClientAddressSendOut[0],
&Token->Packet->Dhcp4.Header.ClientHwAddr[0],
Token->Packet->Dhcp4.Header.HwAddrLen
);
//
// Wrap the DHCP packet into a net buffer.
//
Frag.Bulk = (UINT8 *) &Token->Packet->Dhcp4;
Frag.Len = Token->Packet->Length;
Wrap = NetbufFromExt (&Frag, 1, 0, 0, DhcpDummyExtFree, NULL);
if (Wrap == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto ON_ERROR;
}
//
// Set the local address and local port.
//
EndPoint.LocalAddr = 0;
EndPoint.LocalPort = 0;
//
// Set the destination address and destination port.
//
CopyMem (&Ip, &Token->RemoteAddress, sizeof (EFI_IPv4_ADDRESS));
EndPoint.RemoteAddr = NTOHL (Ip);
if (Token->RemotePort == 0) {
EndPoint.RemotePort = DHCP_SERVER_PORT;
} else {
EndPoint.RemotePort = Token->RemotePort;
}
//
// Get the gateway.
//
SubnetMask = DhcpSb->Netmask;
Gateway = 0;
if (!IP4_NET_EQUAL (DhcpSb->ClientAddr, EndPoint.RemoteAddr, SubnetMask)) {
CopyMem (&Gateway, &Token->GatewayAddress, sizeof (EFI_IPv4_ADDRESS));
Gateway = NTOHL (Gateway);
}
//
// Transmit the DHCP packet.
//
Status = UdpIoSendDatagram (Instance->UdpIo, Wrap, &EndPoint, Gateway, DhcpOnPacketSent, NULL);
if (EFI_ERROR (Status)) {
NetbufFree (Wrap);
goto ON_ERROR;
}
//
// Start to receive the DHCP response.
//
Status = UdpIoRecvDatagram (Instance->UdpIo, PxeDhcpInput, Instance, 0);
if (EFI_ERROR (Status)) {
goto ON_ERROR;
}
ON_ERROR:
if (EFI_ERROR (Status) && (Instance->UdpIo != NULL)) {
UdpIoCleanPort (Instance->UdpIo);
UdpIoFreePort (Instance->UdpIo);
Instance->UdpIo = NULL;
Instance->Token = NULL;
}
gBS->RestoreTPL (OldTpl);
if (!EFI_ERROR (Status) && (Token->CompletionEvent == NULL)) {
//
// Keep polling until timeout if no error happens and the CompletionEvent
// is NULL.
//
while (Instance->Timeout != 0) {
Instance->UdpIo->Udp->Poll (Instance->UdpIo->Udp);
}
}
return Status;
}
/**
Callback function for DhcpIterateOptions. This callback sets the
EFI_DHCP4_PACKET_OPTION array in the DHCP_PARSE_CONTEXT to point
the individual DHCP option in the packet.
@param[in] Tag The DHCP option type
@param[in] Len Length of the DHCP option data
@param[in] Data The DHCP option data
@param[in] Context The context, to pass several parameters in.
@retval EFI_SUCCESS It always returns EFI_SUCCESS
**/
EFI_STATUS
Dhcp4ParseCheckOption (
IN UINT8 Tag,
IN UINT8 Len,
IN UINT8 *Data,
IN VOID *Context
)
{
DHCP_PARSE_CONTEXT *Parse;
Parse = (DHCP_PARSE_CONTEXT *) Context;
Parse->Index++;
if (Parse->Index <= Parse->OptionCount) {
//
// Use BASE_CR to get the memory position of EFI_DHCP4_PACKET_OPTION for
// the EFI_DHCP4_PACKET_OPTION->Data because DhcpIterateOptions only
// pass in the point to option data.
//
Parse->Option[Parse->Index - 1] = BASE_CR (Data, EFI_DHCP4_PACKET_OPTION, Data);
}
return EFI_SUCCESS;
}
/**
Parses the packed DHCP option data.
The Parse() function is used to retrieve the option list from a DHCP packet.
If *OptionCount isn't zero, and there is enough space for all the DHCP options
in the Packet, each element of PacketOptionList is set to point to somewhere in
the Packet->Dhcp4.Option where a new DHCP option begins. If RFC3396 is supported,
the caller should reassemble the parsed DHCP options to get the finial result.
If *OptionCount is zero or there isn't enough space for all of them, the number
of DHCP options in the Packet is returned in OptionCount.
@param This Pointer to the EFI_DHCP4_PROTOCOL instance.
@param Packet Pointer to packet to be parsed.
@param OptionCount On input, the number of entries in the PacketOptionList.
On output, the number of entries that were written into the
PacketOptionList.
@param PacketOptionList List of packet option entries to be filled in. End option or pad
options are not included.
@retval EFI_SUCCESS The packet was successfully parsed.
@retval EFI_INVALID_PARAMETER Some parameter is NULL.
@retval EFI_BUFFER_TOO_SMALL One or more of the following conditions is TRUE:
1) *OptionCount is smaller than the number of options that
were found in the Packet.
2) PacketOptionList is NULL.
**/
EFI_STATUS
EFIAPI
EfiDhcp4Parse (
IN EFI_DHCP4_PROTOCOL *This,
IN EFI_DHCP4_PACKET *Packet,
IN OUT UINT32 *OptionCount,
OUT EFI_DHCP4_PACKET_OPTION *PacketOptionList[] OPTIONAL
)
{
DHCP_PARSE_CONTEXT Context;
EFI_STATUS Status;
//
// First validate the parameters
//
if ((This == NULL) || (Packet == NULL) || (OptionCount == NULL)) {
return EFI_INVALID_PARAMETER;
}
if ((Packet->Size < Packet->Length + 2 * sizeof (UINT32)) ||
(Packet->Dhcp4.Magik != DHCP_OPTION_MAGIC) ||
EFI_ERROR (DhcpValidateOptions (Packet, NULL))) {
return EFI_INVALID_PARAMETER;
}
if ((*OptionCount != 0) && (PacketOptionList == NULL)) {
return EFI_BUFFER_TOO_SMALL;
}
ZeroMem (PacketOptionList, *OptionCount * sizeof (EFI_DHCP4_PACKET_OPTION *));
Context.Option = PacketOptionList;
Context.OptionCount = *OptionCount;
Context.Index = 0;
Status = DhcpIterateOptions (Packet, Dhcp4ParseCheckOption, &Context);
if (EFI_ERROR (Status)) {
return Status;
}
*OptionCount = Context.Index;
if (Context.Index > Context.OptionCount) {
return EFI_BUFFER_TOO_SMALL;
}
return EFI_SUCCESS;
}
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