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CloverBootloader/NetworkPkg/Udp4Dxe/Udp4Impl.h

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/** @file
EFI UDPv4 protocol implementation.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef _UDP4_IMPL_H_
#define _UDP4_IMPL_H_
#include <Uefi.h>
#include <Protocol/Ip4.h>
#include <Protocol/Udp4.h>
#include <Library/IpIoLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/BaseLib.h>
#include <Library/UefiLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/TimerLib.h>
#include <Library/DpcLib.h>
#include <Library/PrintLib.h>
#include "Udp4Driver.h"
extern EFI_COMPONENT_NAME_PROTOCOL gUdp4ComponentName;
extern EFI_COMPONENT_NAME2_PROTOCOL gUdp4ComponentName2;
extern EFI_UNICODE_STRING_TABLE *gUdpControllerNameTable;
extern EFI_SERVICE_BINDING_PROTOCOL mUdp4ServiceBinding;
extern EFI_UDP4_PROTOCOL mUdp4Protocol;
extern UINT16 mUdp4RandomPort;
#define ICMP_ERROR_PACKET_LENGTH 8
#define UDP4_TIMEOUT_INTERVAL (50 * TICKS_PER_MS) // 50 milliseconds
#define UDP4_HEADER_SIZE sizeof (EFI_UDP_HEADER)
#define UDP4_MAX_DATA_SIZE 65507
#define UDP4_PORT_KNOWN 1024
#define UDP4_SERVICE_DATA_SIGNATURE SIGNATURE_32('U', 'd', 'p', '4')
#define UDP4_SERVICE_DATA_FROM_THIS(a) \
CR ( \
(a), \
UDP4_SERVICE_DATA, \
ServiceBinding, \
UDP4_SERVICE_DATA_SIGNATURE \
)
typedef struct _UDP4_SERVICE_DATA_ {
UINT32 Signature;
EFI_SERVICE_BINDING_PROTOCOL ServiceBinding;
EFI_HANDLE ImageHandle;
EFI_HANDLE ControllerHandle;
LIST_ENTRY ChildrenList;
UINTN ChildrenNumber;
IP_IO *IpIo;
EFI_EVENT TimeoutEvent;
} UDP4_SERVICE_DATA;
#define UDP4_INSTANCE_DATA_SIGNATURE SIGNATURE_32('U', 'd', 'p', 'I')
#define UDP4_INSTANCE_DATA_FROM_THIS(a) \
CR ( \
(a), \
UDP4_INSTANCE_DATA, \
Udp4Proto, \
UDP4_INSTANCE_DATA_SIGNATURE \
)
typedef struct _UDP4_INSTANCE_DATA_ {
UINT32 Signature;
LIST_ENTRY Link;
UDP4_SERVICE_DATA *Udp4Service;
EFI_UDP4_PROTOCOL Udp4Proto;
EFI_UDP4_CONFIG_DATA ConfigData;
EFI_HANDLE ChildHandle;
BOOLEAN Configured;
BOOLEAN IsNoMapping;
NET_MAP TxTokens;
NET_MAP RxTokens;
NET_MAP McastIps;
LIST_ENTRY RcvdDgramQue;
LIST_ENTRY DeliveredDgramQue;
UINT16 HeadSum;
EFI_STATUS IcmpError;
IP_IO_IP_INFO *IpInfo;
BOOLEAN InDestroy;
} UDP4_INSTANCE_DATA;
typedef struct _UDP4_RXDATA_WRAP_ {
LIST_ENTRY Link;
NET_BUF *Packet;
UINT32 TimeoutTick;
EFI_UDP4_RECEIVE_DATA RxData;
} UDP4_RXDATA_WRAP;
typedef struct {
EFI_SERVICE_BINDING_PROTOCOL *ServiceBinding;
UINTN NumberOfChildren;
EFI_HANDLE *ChildHandleBuffer;
} UDP4_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT;
/**
Reads the current operational settings.
The GetModeData() function copies the current operational settings of this EFI
UDPv4 Protocol instance into user-supplied buffers. This function is used
optionally to retrieve the operational mode data of underlying networks or
drivers.
@param[in] This Pointer to the EFI_UDP4_PROTOCOL instance.
@param[out] Udp4ConfigData Pointer to the buffer to receive the current configuration data.
@param[out] Ip4ModeData Pointer to the EFI IPv4 Protocol mode data structure.
@param[out] MnpConfigData Pointer to the managed network configuration data structure.
@param[out] SnpModeData Pointer to the simple network mode data structure.
@retval EFI_SUCCESS The mode data was read.
@retval EFI_NOT_STARTED When Udp4ConfigData is queried, no configuration data is
available because this instance has not been started.
@retval EFI_INVALID_PARAMETER This is NULL.
**/
EFI_STATUS
EFIAPI
Udp4GetModeData (
IN EFI_UDP4_PROTOCOL *This,
OUT EFI_UDP4_CONFIG_DATA *Udp4ConfigData OPTIONAL,
OUT EFI_IP4_MODE_DATA *Ip4ModeData OPTIONAL,
OUT EFI_MANAGED_NETWORK_CONFIG_DATA *MnpConfigData OPTIONAL,
OUT EFI_SIMPLE_NETWORK_MODE *SnpModeData OPTIONAL
);
/**
Initializes, changes, or resets the operational parameters for this instance of the EFI UDPv4
Protocol.
The Configure() function is used to do the following:
* Initialize and start this instance of the EFI UDPv4 Protocol.
* Change the filtering rules and operational parameters.
* Reset this instance of the EFI UDPv4 Protocol.
Until these parameters are initialized, no network traffic can be sent or
received by this instance. This instance can be also reset by calling Configure()
with UdpConfigData set to NULL. Once reset, the receiving queue and transmitting
queue are flushed and no traffic is allowed through this instance.
With different parameters in UdpConfigData, Configure() can be used to bind
this instance to specified port.
@param[in] This Pointer to the EFI_UDP4_PROTOCOL instance.
@param[in] UdpConfigData Pointer to the buffer to receive the current configuration data.
@retval EFI_SUCCESS The configuration settings were set, changed, or reset successfully.
@retval EFI_NO_MAPPING When using a default address, configuration (DHCP, BOOTP,
RARP, etc.) is not finished yet.
@retval EFI_INVALID_PARAMETER One or more following conditions are TRUE:
@retval EFI_ALREADY_STARTED The EFI UDPv4 Protocol instance is already started/configured
and must be stopped/reset before it can be reconfigured.
@retval EFI_ACCESS_DENIED UdpConfigData. AllowDuplicatePort is FALSE
and UdpConfigData.StationPort is already used by
other instance.
@retval EFI_OUT_OF_RESOURCES The EFI UDPv4 Protocol driver cannot allocate memory for this
EFI UDPv4 Protocol instance.
@retval EFI_DEVICE_ERROR An unexpected network or system error occurred and this instance
was not opened.
**/
EFI_STATUS
EFIAPI
Udp4Configure (
IN EFI_UDP4_PROTOCOL *This,
IN EFI_UDP4_CONFIG_DATA *UdpConfigData OPTIONAL
);
/**
Joins and leaves multicast groups.
The Groups() function is used to enable and disable the multicast group
filtering. If the JoinFlag is FALSE and the MulticastAddress is NULL, then all
currently joined groups are left.
@param[in] This Pointer to the EFI_UDP4_PROTOCOL instance.
@param[in] JoinFlag Set to TRUE to join a multicast group. Set to FALSE to leave one
or all multicast groups.
@param[in] MulticastAddress Pointer to multicast group address to join or leave.
@retval EFI_SUCCESS The operation completed successfully.
@retval EFI_NOT_STARTED The EFI UDPv4 Protocol instance has not been started.
@retval EFI_NO_MAPPING When using a default address, configuration (DHCP, BOOTP,
RARP, etc.) is not finished yet.
@retval EFI_OUT_OF_RESOURCES Could not allocate resources to join the group.
@retval EFI_INVALID_PARAMETER One or more of the following conditions is TRUE:
- This is NULL.
- JoinFlag is TRUE and MulticastAddress is NULL.
- JoinFlag is TRUE and *MulticastAddress is not
a valid multicast address.
@retval EFI_ALREADY_STARTED The group address is already in the group table (when
JoinFlag is TRUE).
@retval EFI_NOT_FOUND The group address is not in the group table (when JoinFlag is
FALSE).
@retval EFI_DEVICE_ERROR An unexpected system or network error occurred.
**/
EFI_STATUS
EFIAPI
Udp4Groups (
IN EFI_UDP4_PROTOCOL *This,
IN BOOLEAN JoinFlag,
IN EFI_IPv4_ADDRESS *MulticastAddress OPTIONAL
);
/**
Adds and deletes routing table entries.
The Routes() function adds a route to or deletes a route from the routing table.
Routes are determined by comparing the SubnetAddress with the destination IP
address and arithmetically AND-ing it with the SubnetMask. The gateway address
must be on the same subnet as the configured station address.
The default route is added with SubnetAddress and SubnetMask both set to 0.0.0.0.
The default route matches all destination IP addresses that do not match any
other routes.
A zero GatewayAddress is a nonroute. Packets are sent to the destination IP
address if it can be found in the Address Resolution Protocol (ARP) cache or
on the local subnet. One automatic nonroute entry will be inserted into the
routing table for outgoing packets that are addressed to a local subnet
(gateway address of 0.0.0.0).
Each instance of the EFI UDPv4 Protocol has its own independent routing table.
Instances of the EFI UDPv4 Protocol that use the default IP address will also
have copies of the routing table provided by the EFI_IP4_CONFIG_PROTOCOL. These
copies will be updated automatically whenever the IP driver reconfigures its
instances; as a result, the previous modification to these copies will be lost.
@param[in] This Pointer to the EFI_UDP4_PROTOCOL instance.
@param[in] DeleteRoute Set to TRUE to delete this route from the routing table.
Set to FALSE to add this route to the routing table.
@param[in] SubnetAddress The destination network address that needs to be routed.
@param[in] SubnetMask The subnet mask of SubnetAddress.
@param[in] GatewayAddress The gateway IP address for this route.
@retval EFI_SUCCESS The operation completed successfully.
@retval EFI_NOT_STARTED The EFI UDPv4 Protocol instance has not been started.
@retval EFI_NO_MAPPING When using a default address, configuration (DHCP, BOOTP,
- RARP, etc.) is not finished yet.
@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
@retval EFI_OUT_OF_RESOURCES Could not add the entry to the routing table.
@retval EFI_NOT_FOUND This route is not in the routing table.
@retval EFI_ACCESS_DENIED The route is already defined in the routing table.
**/
EFI_STATUS
EFIAPI
Udp4Routes (
IN EFI_UDP4_PROTOCOL *This,
IN BOOLEAN DeleteRoute,
IN EFI_IPv4_ADDRESS *SubnetAddress,
IN EFI_IPv4_ADDRESS *SubnetMask,
IN EFI_IPv4_ADDRESS *GatewayAddress
);
/**
Queues outgoing data packets into the transmit queue.
The Transmit() function places a sending request to this instance of the EFI
UDPv4 Protocol, alongside the transmit data that was filled by the user. Whenever
the packet in the token is sent out or some errors occur, the Token.Event will
be signaled and Token.Status is updated. Providing a proper notification function
and context for the event will enable the user to receive the notification and
transmitting status.
@param[in] This Pointer to the EFI_UDP4_PROTOCOL instance.
@param[in] Token Pointer to the completion token that will be placed into the
transmit queue.
@retval EFI_SUCCESS The data has been queued for transmission.
@retval EFI_NOT_STARTED This EFI UDPv4 Protocol instance has not been started.
@retval EFI_NO_MAPPING When using a default address, configuration (DHCP, BOOTP,
RARP, etc.) is not finished yet.
@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
@retval EFI_ACCESS_DENIED The transmit completion token with the same
Token.Event was already in the transmit queue.
@retval EFI_NOT_READY The completion token could not be queued because the
transmit queue is full.
@retval EFI_OUT_OF_RESOURCES Could not queue the transmit data.
@retval EFI_NOT_FOUND There is no route to the destination network or address.
@retval EFI_BAD_BUFFER_SIZE The data length is greater than the maximum UDP packet
size. Or the length of the IP header + UDP header + data
length is greater than MTU if DoNotFragment is TRUE.
**/
EFI_STATUS
EFIAPI
Udp4Transmit (
IN EFI_UDP4_PROTOCOL *This,
IN EFI_UDP4_COMPLETION_TOKEN *Token
);
/**
Places an asynchronous receive request into the receiving queue.
The Receive() function places a completion token into the receive packet queue.
This function is always asynchronous.
The caller must fill in the Token.Event field in the completion token, and this
field cannot be NULL. When the receive operation completes, the EFI UDPv4 Protocol
driver updates the Token.Status and Token.Packet.RxData fields and the Token.Event
is signaled. Providing a proper notification function and context for the event
will enable the user to receive the notification and receiving status. That
notification function is guaranteed to not be re-entered.
@param[in] This Pointer to the EFI_UDP4_PROTOCOL instance.
@param[in] Token Pointer to a token that is associated with
the receive data descriptor.
@retval EFI_SUCCESS The receive completion token was cached.
@retval EFI_NOT_STARTED This EFI UDPv4 Protocol instance has not been started.
@retval EFI_NO_MAPPING When using a default address, configuration (DHCP, BOOTP, RARP, etc.)
is not finished yet.
@retval EFI_INVALID_PARAMETER One or more of the following conditions is TRUE:
@retval EFI_OUT_OF_RESOURCES The receive completion token could not be queued due to a lack of system
resources (usually memory).
@retval EFI_DEVICE_ERROR An unexpected system or network error occurred.
@retval EFI_ACCESS_DENIED A receive completion token with the same Token.Event was already in
the receive queue.
@retval EFI_NOT_READY The receive request could not be queued because the receive queue is full.
**/
EFI_STATUS
EFIAPI
Udp4Receive (
IN EFI_UDP4_PROTOCOL *This,
IN EFI_UDP4_COMPLETION_TOKEN *Token
);
/**
Aborts an asynchronous transmit or receive request.
The Cancel() function is used to abort a pending transmit or receive request.
If the token is in the transmit or receive request queues, after calling this
function, Token.Status will be set to EFI_ABORTED and then Token.Event will be
signaled. If the token is not in one of the queues, which usually means that
the asynchronous operation has completed, this function will not signal the
token and EFI_NOT_FOUND is returned.
@param[in] This Pointer to the EFI_UDP4_PROTOCOL instance.
@param[in] Token Pointer to a token that has been issued by
EFI_UDP4_PROTOCOL.Transmit() or
EFI_UDP4_PROTOCOL.Receive().If NULL, all pending
tokens are aborted.
@retval EFI_SUCCESS The asynchronous I/O request was aborted and Token.Event
was signaled. When Token is NULL, all pending requests are
aborted and their events are signaled.
@retval EFI_INVALID_PARAMETER This is NULL.
@retval EFI_NOT_STARTED This instance has not been started.
@retval EFI_NO_MAPPING When using the default address, configuration (DHCP, BOOTP,
RARP, etc.) is not finished yet.
@retval EFI_NOT_FOUND When Token is not NULL, the asynchronous I/O request was
not found in the transmit or receive queue. It has either completed
or was not issued by Transmit() and Receive().
**/
EFI_STATUS
EFIAPI
Udp4Cancel (
IN EFI_UDP4_PROTOCOL *This,
IN EFI_UDP4_COMPLETION_TOKEN *Token OPTIONAL
);
/**
Polls for incoming data packets and processes outgoing data packets.
The Poll() function can be used by network drivers and applications to increase
the rate that data packets are moved between the communications device and the
transmit and receive queues.
In some systems, the periodic timer event in the managed network driver may not
poll the underlying communications device fast enough to transmit and/or receive
all data packets without missing incoming packets or dropping outgoing packets.
Drivers and applications that are experiencing packet loss should try calling
the Poll() function more often.
@param[in] This Pointer to the EFI_UDP4_PROTOCOL instance.
@retval EFI_SUCCESS Incoming or outgoing data was processed.
@retval EFI_INVALID_PARAMETER This is NULL.
@retval EFI_DEVICE_ERROR An unexpected system or network error occurred.
@retval EFI_TIMEOUT Data was dropped out of the transmit and/or receive queue.
**/
EFI_STATUS
EFIAPI
Udp4Poll (
IN EFI_UDP4_PROTOCOL *This
);
/**
Create the Udp service context data.
@param[in, out] Udp4Service Pointer to the UDP4_SERVICE_DATA.
@param[in] ImageHandle The image handle of this udp4 driver.
@param[in] ControllerHandle The controller handle this udp4 driver binds on.
@retval EFI_SUCCESS The udp4 service context data is created and
initialized.
@retval EFI_OUT_OF_RESOURCES Cannot allocate memory.
@retval other Other error occurs.
**/
EFI_STATUS
Udp4CreateService (
IN OUT UDP4_SERVICE_DATA *Udp4Service,
IN EFI_HANDLE ImageHandle,
IN EFI_HANDLE ControllerHandle
);
/**
Clean the Udp service context data.
@param[in] Udp4Service Pointer to the UDP4_SERVICE_DATA.
**/
VOID
Udp4CleanService (
IN UDP4_SERVICE_DATA *Udp4Service
);
/**
This function initializes the new created udp instance.
@param[in] Udp4Service Pointer to the UDP4_SERVICE_DATA.
@param[in, out] Instance Pointer to the un-initialized UDP4_INSTANCE_DATA.
**/
VOID
Udp4InitInstance (
IN UDP4_SERVICE_DATA *Udp4Service,
IN OUT UDP4_INSTANCE_DATA *Instance
);
/**
This function cleans the udp instance.
@param[in] Instance Pointer to the UDP4_INSTANCE_DATA to clean.
**/
VOID
Udp4CleanInstance (
IN UDP4_INSTANCE_DATA *Instance
);
/**
This function tries to bind the udp instance according to the configured port
allocation strategy.
@param[in] InstanceList Pointer to the head of the list linking the udp
instances.
@param[in, out] ConfigData Pointer to the ConfigData of the instance to be
bound. ConfigData->StationPort will be assigned
with an available port value on success.
@retval EFI_SUCCESS The bound operation is completed successfully.
@retval EFI_ACCESS_DENIED The <Address, Port> specified by the ConfigData is
already used by other instance.
@retval EFI_OUT_OF_RESOURCES No available port resources.
**/
EFI_STATUS
Udp4Bind (
IN LIST_ENTRY *InstanceList,
IN OUT EFI_UDP4_CONFIG_DATA *ConfigData
);
/**
This function is used to check whether the NewConfigData has any un-reconfigurable
parameters changed compared to the OldConfigData.
@param[in] OldConfigData Pointer to the current ConfigData the udp instance
uses.
@param[in] NewConfigData Pointer to the new ConfigData.
@retval TRUE The instance is reconfigurable.
@retval FALSE Otherwise.
**/
BOOLEAN
Udp4IsReconfigurable (
IN EFI_UDP4_CONFIG_DATA *OldConfigData,
IN EFI_UDP4_CONFIG_DATA *NewConfigData
);
/**
This function builds the Ip4 configdata from the Udp4ConfigData.
@param[in] Udp4ConfigData Pointer to the EFI_UDP4_CONFIG_DATA.
@param[in, out] Ip4ConfigData Pointer to the EFI_IP4_CONFIG_DATA.
**/
VOID
Udp4BuildIp4ConfigData (
IN EFI_UDP4_CONFIG_DATA *Udp4ConfigData,
IN OUT EFI_IP4_CONFIG_DATA *Ip4ConfigData
);
/**
This function validates the TxToken, it returns the error code according to the spec.
@param[in] Instance Pointer to the udp instance context data.
@param[in] TxToken Pointer to the token to be checked.
@retval EFI_SUCCESS The TxToken is valid.
@retval EFI_INVALID_PARAMETER One or more of the following are TRUE: This is
NULL. Token is NULL. Token.Event is NULL.
Token.Packet.TxData is NULL.
Token.Packet.TxData.FragmentCount is zero.
Token.Packet.TxData.DataLength is not equal to the
sum of fragment lengths. One or more of the
Token.Packet.TxData.FragmentTable[].
FragmentLength fields is zero. One or more of the
Token.Packet.TxData.FragmentTable[].
FragmentBuffer fields is NULL.
Token.Packet.TxData. GatewayAddress is not a
unicast IPv4 address if it is not NULL. One or
more IPv4 addresses in Token.Packet.TxData.
UdpSessionData are not valid unicast IPv4
addresses if the UdpSessionData is not NULL.
@retval EFI_BAD_BUFFER_SIZE The data length is greater than the maximum UDP
packet size.
**/
EFI_STATUS
Udp4ValidateTxToken (
IN UDP4_INSTANCE_DATA *Instance,
IN EFI_UDP4_COMPLETION_TOKEN *TxToken
);
/**
This function checks whether the specified Token duplicates with the one in the Map.
@param[in] Map Pointer to the NET_MAP.
@param[in] Item Pointer to the NET_MAP_ITEM contain the pointer to
the Token.
@param[in] Context Pointer to the Token to be checked.
@retval EFI_SUCCESS The Token specified by Context differs from the
one in the Item.
@retval EFI_ACCESS_DENIED The Token duplicates with the one in the Item.
**/
EFI_STATUS
EFIAPI
Udp4TokenExist (
IN NET_MAP *Map,
IN NET_MAP_ITEM *Item,
IN VOID *Context
);
/**
This function calculates the checksum for the Packet, utilizing the pre-calculated
pseudo HeadSum to reduce some overhead.
@param[in] Packet Pointer to the NET_BUF contains the udp datagram.
@param[in] HeadSum Checksum of the pseudo header except the length
field.
@retval The 16-bit checksum of this udp datagram.
**/
UINT16
Udp4Checksum (
IN NET_BUF *Packet,
IN UINT16 HeadSum
);
/**
This function removes the specified Token from the TokenMap.
@param[in, out] TokenMap Pointer to the NET_MAP containing the tokens.
@param[in] Token Pointer to the Token to be removed.
@retval EFI_SUCCESS The specified Token is removed from the TokenMap.
@retval EFI_NOT_FOUND The specified Token is not found in the TokenMap.
**/
EFI_STATUS
Udp4RemoveToken (
IN OUT NET_MAP *TokenMap,
IN EFI_UDP4_COMPLETION_TOKEN *Token
);
/**
This function removes the multicast group specified by Arg from the Map.
@param[in, out] Map Pointer to the NET_MAP.
@param[in] Item Pointer to the NET_MAP_ITEM.
@param[in] Arg Pointer to the Arg, it's the pointer to a
multicast IPv4 Address.
@retval EFI_SUCCESS The multicast address is removed.
@retval EFI_ABORTED The specified multicast address is removed and the
Arg is not NULL.
**/
EFI_STATUS
EFIAPI
Udp4LeaveGroup (
IN OUT NET_MAP *Map,
IN NET_MAP_ITEM *Item,
IN VOID *Arg OPTIONAL
);
/**
This function removes all the Wrap datas in the RcvdDgramQue.
@param[in] Instance Pointer to the udp instance context data.
**/
VOID
Udp4FlushRcvdDgram (
IN UDP4_INSTANCE_DATA *Instance
);
/**
Cancel Udp4 tokens from the Udp4 instance.
@param[in] Instance Pointer to the udp instance context data.
@param[in] Token Pointer to the token to be canceled, if NULL, all
tokens in this instance will be cancelled.
@retval EFI_SUCCESS The Token is cancelled.
@retval EFI_NOT_FOUND The Token is not found.
**/
EFI_STATUS
Udp4InstanceCancelToken (
IN UDP4_INSTANCE_DATA *Instance,
IN EFI_UDP4_COMPLETION_TOKEN *Token OPTIONAL
);
/**
This function delivers the received datagrams for the specified instance.
@param[in] Instance Pointer to the instance context data.
**/
VOID
Udp4InstanceDeliverDgram (
IN UDP4_INSTANCE_DATA *Instance
);
/**
This function reports the received ICMP error.
@param[in] Instance Pointer to the udp instance context data.
**/
VOID
Udp4ReportIcmpError (
IN UDP4_INSTANCE_DATA *Instance
);
/**
This function is a dummy ext-free function for the NET_BUF created for the output
udp datagram.
@param[in] Context Pointer to the context data.
**/
VOID
EFIAPI
Udp4NetVectorExtFree (
VOID *Context
);
#endif
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