30. Network Protocols — UDP and MTFTP

30.1. EFI UDP Protocol

This chapter defines the EFI UDP (User Datagram Protocol) Protocol that interfaces over the EFI IP Protocol, and the EFI MTFTP Protocol interface that is built upon the EFI UDP Protocol. Protocols for version 4 and version 6 of UDP and MTFTP are included.

30.1.1. UDP4 Service Binding Protocol

30.1.1.1. EFI_UDP4_SERVICE_BINDING_PROTOCOL

Summary

The EFI UDPv4 Service Binding Protocol is used to locate communication devices that are supported by an EFI UDPv4 Protocol driver and to create and destroy instances of the EFI UDPv4 Protocol child protocol driver that can use the underlying communications device.

GUID

#define EFI_UDP4_SERVICE_BINDING_PROTOCOL_GUID \
  {0x83f01464,0x99bd,0x45e5,\
    {0xb3,0x83,0xaf,0x63,0x05,0xd8,0xe9,0xe6}}

Description

A network application that requires basic UDPv4 I/O services can use one of the protocol handler services, such as BS->LocateHandleBuffer(), to search for devices that publish a EFI UDPv4 Service Binding Protocol GUID. Each device with a published EFI UDPv4 Service Binding Protocol GUID supports the EFI UDPv4 Protocol and may be available for use.

After a successful call to the EFI_UDP4_SERVICE_BINDING_PROTOCOL .CreateChild() function, the newly created child EFI UDPv4 Protocol driver is in an unconfigured state; it is not ready to send and receive data packets.

Before a network application terminates execution every successful call to the EFI_UDP4_SERVICE_BINDING_PROTOCOL .CreateChild() function must be matched with a call to the EFI_UDP4_SERVICE_BINDING_PROTOCOL.DestroyChild() function.

30.1.2. UDP4 Protocol

30.1.2.1. EFI_UDP4_PROTOCOL

Summary

The EFI UDPv4 Protocol provides simple packet-oriented services to transmit and receive UDP packets.

GUID

#define EFI_UDP4_PROTOCOL_GUID \
  {0x3ad9df29,0x4501,0x478d,\
    {0xb1,0xf8,0x7f,0x7f,0xe7,0x0e,0x50,0xf3}}

Protocol Interface Structure

typedef struct _EFI_UDP4_PROTOCOL {
  EFI_UDP4_GET_MODE_DATA         GetModeData;
  EFI_UDP4_CONFIGURE             Configure;
  EFI_UDP4_GROUPS                Groups;
  EFI_UDP4_ROUTES                Routes;
  EFI_UDP4_TRANSMIT              Transmit;
  EFI_UDP4_RECEIVE               Receive;
  EFI_UDP4_CANCEL                Cancel;
  EFI_UDP4_POLL                  Poll;
}  EFI_UDP4_PROTOCOL;

Parameters

GetModeData: Reads the current operational settings. See the GetModeData() function description.
Configure: Initializes, changes, or resets operational settings for the EFI UDPv4 Protocol. See the Configure() function description.
Groups: Joins and leaves multicast groups. See the Groups() function description.
Routes: Add and deletes routing table entries. See the Routes() function description.
Transmit: Queues outgoing data packets into the transmit queue. This function is a nonblocked operation. See the Transmit() function description.
Receive: Places a receiving request token into the receiving queue. This function is a nonblocked operation. See the Receive() function description.
Cancel: Aborts a pending transmit or receive request. See the Cancel() function description.
Poll: Polls for incoming data packets and processes outgoing data packets. See the Poll() function description.

Description

The EFI_UDP4_PROTOCOL defines an EFI UDPv4 Protocol session that can be used by any network drivers, applications, or daemons to transmit or receive UDP packets. This protocol instance can either be bound to a specified port as a service or connected to some remote peer as an active client. Each instance has its own settings, such as the routing table and group table, which are independent from each other.

NOTE: In this document, all IPv4 addresses and incoming/outgoing packets are stored in network byte order. All other parameters in the functions and data structures that are defined in this document are stored in host byte order.

30.1.2.2. EFI_UDP4_PROTOCOL.GetModeData()

Summary

Reads the current operational settings.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP4_GET_MODE_DATA) (
  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
  );

Parameters

This: Pointer to the EFI_UDP4_PROTOCOL instance.
Udp4ConfigData: Pointer to the buffer to receive the current configuration data. Type EFI_UDP4_CONFIG_DATA is defined in “Related Definitions” below.
Ip4ModeData*: Pointer to the EFI IPv4 Protocol mode data structure. Type EFI_IP4_MODE_DATA is defined in EFI_IP4_PROTOCOL .GetModeData().
MnpConfigData: Pointer to the managed network configuration data structure. Type EFI_MANAGED_NETWORK_CONFIG_DATA is defined in EFI_MANAGED_NETWORK_PROTOCOL.GetModeData().
SnpModeData: Pointer to the simple network mode data structure. Type EFI_SIMPLE_NETWORK_MODE is defined in the EFI_SIMPLE_NETWORK_PROTOCOL.

Description

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.

Related Definition

//**************************************************
// EFI_UDP4_CONFIG_DATA
//**************************************************
typedef struct {
  //Receiving Filters
  BOOLEAN              AcceptBroadcast;
  BOOLEAN              AcceptPromiscuous;
  BOOLEAN              AcceptAnyPort;
  BOOLEAN              AllowDuplicatePort;
  // I/O parameters
  UINT8                TypeOfService;
  UINT8                TimeToLive;
  BOOLEAN              DoNotFragment;
  UINT32               ReceiveTimeout;
  UINT32               TransmitTimeout;
  // Access Point
  BOOLEAN              UseDefaultAddress;
  EFI_IPv4_ADDRESS     StationAddress;
  EFI_IPv4_ADDRESS     SubnetMask;
  UINT16               StationPort;
  EFI_IPv4_ADDRESS     RemoteAddress;
  UINT16               RemotePort;
}  EFI_UDP4_CONFIG_DATA;

AcceptBroadcast: Set to TRUE to accept broadcast UDP packets.
AcceptPromiscuous: Set to TRUE to accept UDP packets that are sent to any address.
AcceptAnyPort: Set to TRUE to accept UDP packets that are sent to any port.
AllowDuplicatePort: Set to TRUE to allow this EFI UDPv4 Protocol child instance to open a port number that is already being used by another EFI UDPv4 Protocol child instance.
TypeOfService: TypeOfService field in transmitted IPv4 packets.
TimeToLive: TimeToLive field in transmitted IPv4 packets.
DoNotFragment: Set to TRUE to disable IP transmit fragmentation.
ReceiveTimeout: The receive timeout value (number of microseconds) to be associated with each incoming packet. Zero means do not drop incoming packets.
TransmitTimeout: The transmit timeout value (number of microseconds) to be associated with each outgoing packet. Zero means do not drop outgoing packets.
UseDefaultAddress: Set to TRUE to use the default IP address and default routing table. If the default IP address is not available yet, then the underlying EFI IPv4 Protocol driver will use EFI_IP4_CONFIG2_PROTOCOL to retrieve the IP address and subnet information. Ignored for incoming filtering if AcceptPromiscuous is set to TRUE.
StationAddress: The station IP address that will be assigned to this EFI UDPv4 Protocol instance. The EFI UDPv4 and EFI IPv4 Protocol drivers will only deliver incoming packets whose destination matches this IP address exactly. Address 0.0.0.0 is also accepted as a special case in which incoming packets destined to any station IP address are always delivered. Not used when UseDefaultAddress is TRUE. Ignored for incoming filtering if AcceptPromiscuous is TRUE.
SubnetMask: The subnet address mask that is associated with the station address. Not used when UseDefaultAddress is TRUE.
StationPort: The port number to which this EFI UDPv4 Protocol instance is bound. If a client of the EFI UDPv4 Protocol does not care about the port number, set StationPort to zero. The EFI UDPv4 Protocol driver will assign a random port number to transmitted UDP packets. Ignored if AcceptAnyPort is set to TRUE.
RemoteAddress: The IP address of remote host to which this EFI UDPv4 Protocol instance is connecting. If RemoteAddress is not 0.0.0.0, this EFI UDPv4 Protocol instance will be connected to RemoteAddress; i.e., outgoing packets of this EFI UDPv4 Protocol instance will be sent to this address by default and only incoming packets from this address will be delivered to client. Ignored for incoming filtering if AcceptPromiscuous is TRUE.
RemotePort: The port number of the remote host to which this EFI UDPv4 Protocol instance is connecting. If it is not zero, outgoing packets of this EFI UDPv4 Protocol instance will be sent to this port number by default and only incoming packets from this port will be delivered to client. Ignored if RemoteAddress is 0.0.0.0 and ignored for incoming filtering if AcceptPromiscuous is TRUE.

Status Codes Returned

EFI_SUCCESS	The mode data was read.
EFI_NOT_STARTED	When Udp4ConfigData is queried, no configuration data is available because this instance has not been started.
EFI_INVALID_PARAMETER	This is NULL.

30.1.2.3. EFI_UDP4_PROTOCOL.Configure()

Summary

Initializes, changes, or resets the operational parameters for this instance of the EFI UDPv4 Protocol.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP4_CONFIGURE) (
  IN EFI_UDP4_PROTOCOL         *This,
  IN EFI_UDP4_CONFIG_DATA      *UdpConfigData OPTIONAL
  );

Parameters

This: Pointer to the EFI_UDP4_PROTOCOL instance.
UdpConfigData: Pointer to the buffer to receive the current mode data.

Description

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.

Status Codes Returned

EFI_SUCCESS	The configuration settings were set, changed, or reset successfully.
EFI_NO_MAPPING	When using a default address, configuration (DHCP, BOOTP, RARP, etc.) is not finished yet.
EFI_INVALID_PARAMETER	One or more following conditions are TRUE : • This is NULL. • UdpConfigData.StationAddress is not a valid unicast IPv4 address. • UdpConfigData.SubnetMask is not a valid IPv4 address mask. The subnet mask must be contiguous. • UdpConfigData.RemoteAddress is not a valid unicast IPv4 address if it is not zero.
EFI_ALREADY_STARTED	The EFI UDPv4 Protocol instance is already started/configured and must be stopped/reset before it can be reconfigured. Only TypeOfService, TimeToLive, DoNotFragment, ReceiveTimeout, and TransmitTimeout can be reconfigured without stopping the current instance of the EFI UDPv4 Protocol.
EFI_ACCESS_DENIED	UdpConfigData. AllowDuplicatePort is FALSE and UdpConfigData.StationPort is already used by other instance.
EFI_OUT_OF_RESOURCES	The EFI UDPv4 Protocol driver cannot allocate memory for this EFI UDPv4 Protocol instance.
EFI_DEVICE_ERROR	An unexpected network or system error occurred and this instance was not opened.

30.1.2.4. EFI_UDP4_PROTOCOL.Groups()

Summary

Joins and leaves multicast groups.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP4_GROUPS) (
  IN EFI_UDP4_PROTOCOL       *This,
  IN BOOLEAN                 JoinFlag,
  IN EFI_IPv4_ADDRESS        *MulticastAddress OPTIONAL
  );

Parameters

This: Pointer to the EFI_UDP4_PROTOCOL instance.
JoinFlag: Set to TRUE to join a multicast group. Set to FALSE to leave one or all multicast groups.
MulticastAddress: Pointer to multicast group address to join or leave.

Description

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.

Status Codes Returned

EFI_SUCCESS	The operation completed successfully.
EFI_NOT_STARTED	The EFI UDPv4 Protocol instance has not been started.
EFI_NO_MAPPING	When using a default address, configuration (DHCP, BOOTP, RARP, etc.) is not finished yet.
EFI_OUT_OF_RESOURCES	Could not allocate resources to join the group.
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.
EFI_ALREADY_STARTED	The group address is already in the group table (when JoinFlag is TRUE).
EFI_NOT_FOUND	The group address is not in the group table (when JoinFlag is FALSE).
EFI_DEVICE_ERROR	An unexpected system or network error occurred.

30.1.2.5. EFI_UDP4_PROTOCOL.Routes()

Summary

Adds and deletes routing table entries.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP4_ROUTES) (
  IN EFI_UDP4_PROTOCOL       *This,
  IN BOOLEAN                 DeleteRoute,
  IN EFI_IPv4_ADDRESS        *SubnetAddress,
  IN EFI_IPv4_ADDRESS        *SubnetMask,
  IN EFI_IPv4_ADDRESS        *GatewayAddress
  );

Parameters

This: Pointer to the EFI_UDP4_PROTOCOL instance.
DeleteRoute: Set to TRUE to delete this route from the routing table. Set to FALSE to add this route to the routing table. DestinationAddress and SubnetMask are used as the key to each route entry.
SubnetAddress: The destination network address that needs to be routed.
SubnetMask: The subnet mask of SubnetAddress.
GatewayAddress: The gateway IP address for this route.

Description

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_CONFIG2_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.

NOTE: There is no way to set up routes to other network interface cards (NICs) because each NIC has its own independent network stack that shares information only through EFI UDP4 Variable.

Status Codes Returned

EFI_SUCCESS	The operation completed successfully.
EFI_NOT_STARTED	The EFI UDPv4 Protocol instance has not been started.
EFI_NO_MAPPING	When using a default address, configuration (DHCP, BOOTP, RARP, etc.) is not finished yet.
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE : • This is NULL. • SubnetAddress is NULL. • SubnetMask is NULL. • GatewayAddress is NULL. • SubnetAddress is not a valid subnet address. • SubnetMask is not a valid subnet mask. • GatewayAddress is not a valid unicast IP address.
EFI_OUT_OF_RESOURCES	Could not add the entry to the routing table.
EFI_NOT_FOUND	This route is not in the routing table.
EFI_ACCESS_DENIED	The route is already defined in the routing table.

30.1.2.6. EFI_UDP4_PROTOCOL.Transmit()

Summary

Queues outgoing data packets into the transmit queue.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP4_TRANSMIT) (
  IN EFI_UDP4_PROTOCOL               *This,
  IN EFI_UDP4_COMPLETION_TOKEN       *Token
  );

Parameters

This: Pointer to the EFI_UDP4_PROTOCOL instance.
Token: Pointer to the completion token that will be placed into the transmit queue. Type EFI_UDP4_COMPLETION_TOKEN is defined in “Related Definitions” below.

Description

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.

Related Definitions

//****************************************************
// EFI_UDP4_COMPLETION_TOKEN
//****************************************************
typedef struct {
  EFI_EVENT                  Event;
  EFI_STATUS                 Status;
  union {
    EFI_UDP4_RECEIVE_DATA    *RxData;
    EFI_UDP4_TRANSMIT_DATA   *TxData;
  }            Packet;
}  EFI_UDP4_COMPLETION_TOKEN;

Event: This Event will be signaled after the Status field is updated by the EFI UDPv4 Protocol driver. The type of Event must be EVT_NOTIFY_SIGNAL. The Task Priority Level (TPL) of Event must be lower than or equal to TPL_CALLBACK .
Status: Will be set to one of the following values:

EFI_SUCCESS. The receive or transmit operation completed successfully.

EFI_ABORTED. The receive or transmit was aborted.

EFI_TIMEOUT. The transmit timeout expired.

EFI_NETWORK_UNREACHABLE. The destination network is unreachable. RxData is set to NULL in this situation.

EFI_HOST_UNREACHABLE. The destination host is unreachable. RxData is set to NULL in this situation.

EFI_PROTOCOL_UNREACHABLE. The UDP protocol is unsupported in the remote system. RxData is set to NULL in this situation.

EFI_PORT_UNREACHABLE. No service is listening on the remote port. RxData is set to NULL in this situation.

EFI_ICMP_ERROR. Some other Internet Control Message Protocol (ICMP) error report was received. For example, packets are being sent too fast for the destination to receive them and the destination sent an ICMP source quench report. RxData is set to NULL in this situation.

EFI_DEVICE_ERROR. An unexpected system or network error occurred.

EFI_NO_MEDIA. There was a media error.
RxData: When this token is used for receiving, RxData is a pointer to EFI_UDP4_RECEIVE_DATA. Type EFI_UDP4_RECEIVE_DATA is defined below.
TxData: When this token is used for transmitting, TxData is a pointer to EFI_UDP4_TRANSMIT_DATA. Type EFI_UDP4_TRANSMIT_DATA is defined below.

The EFI_UDP4_COMPLETION_TOKEN structures are used for both transmit and receive operations.

When used for transmitting, the Event and TxData fields must be filled in by the EFI UDPv4 Protocol client. After the transmit operation completes, the Status field is updated by the EFI UDPv4 Protocol and the Event is signaled.

When used for receiving, only the Event field must be filled in by the EFI UDPv4 Protocol client. After a packet is received, RxData and Status are filled in by the EFI UDPv4 Protocol and the Event is signaled.
The ICMP related status codes filled in Status are defined as follows:

//****************************************************
// UDP4 Token Status definition
//****************************************************
#define EFI_NETWORK_UNREACHABLE     EFIERR(100)
#define EFI_HOST_UNREACHABLE        EFIERR(101)
#define EFI_PROTOCOL_UNREACHABLE    EFIERR(102)
#define EFI_PORT_UNREACHABLE        EFIERR(103)

//****************************************************
// EFI_UDP4_RECEIVE_DATA
//****************************************************
typedef struct {
  EFI_TIME                  TimeStamp;
  EFI_EVENT                 RecycleSignal;
  EFI_UDP4_SESSION_DATA     UdpSession;
  UINT32                    DataLength;
  UINT32                    FragmentCount;
  EFI_UDP4_FRAGMENT_DATA    FragmentTable[1];
}   EFI_UDP4_RECEIVE_DATA;

TimeStamp: Time when the EFI UDPv4 Protocol accepted the packet. TimeStamp is zero filled if timestamps are disabled or unsupported
RecycleSignal: Indicates the event to signal when the received data has been processed.
UdpSession: The UDP session data including SourceAddress, SourcePort, DestinationAddress, and DestinationPort. Type EFI_UDP4_SESSION_DATA is defined below.
DataLength: The sum of the fragment data length.
FragmentCount: Number of fragments. May be zero.
FragmentTable: Array of fragment descriptors. IP and UDP headers are included in these buffers if ConfigData.RawData is TRUE. Otherwise they are stripped. May be zero. Type EFI_UDP4_FRAGMENT_DATA is defined below.

EFI_UDP4_RECEIVE_DATA is filled by the EFI UDPv4 Protocol driver when this EFI UDPv4 Protocol instance receives an incoming packet. If there is a waiting token for incoming packets, the CompletionToken.Packet.RxData field is updated to this incoming packet and the CompletionToken.Event is signaled. The EFI UDPv4 Protocol client must signal the RecycleSignal after processing the packet.

FragmentTable could contain multiple buffers that are not in the continuous memory locations. The EFI UDPv4 Protocol client might need to combine two or more buffers in FragmentTable to form their own protocol header.

//***************************************************
// EFI_UDP4_SESSION_DATA
//***************************************************
typedef struct {
  EFI_IPv4_ADDRESS         SourceAddress;
  UINT16                   SourcePort;
  EFI_IPv4_ADDRESS         DestinationAddress;
  UINT16                   DestinationPort;
}  EFI_UDP4_SESSION_DATA;

SourceAddress: Address from which this packet is sent. If this field is set to zero when sending packets, the address that is assigned in EFI_UDP4_PROTOCOL .Configure() is used.
SourcePort: Port from which this packet is sent. It is in host byte order. If this field is set to zero when sending packets, the port that is assigned in EFI_UDP4_PROTOCOL .Configure() is used. If this field is set to zero and unbound, a call to EFI_UDP4_PROTOCOL.Transmit() will fail.
DestinationAddress: Address to which this packet is sent.
DestinationPort: Port to which this packet is sent. It is in host byte order. If this field is set to zero and unconnected, the call to EFI_UDP4_PROTOCOL .Transmit() will fail.

The EFI_UDP4_SESSION_DATA is used to retrieve the settings when receiving packets or to override the existing settings of this EFI UDPv4 Protocol instance when sending packets.

//***************************************************
// EFI_UDP4_FRAGMENT_DATA
//***************************************************
typedef struct {
  UINT32             FragmentLength;
  VOID               *FragmentBuffer;
}  EFI_UDP4_FRAGMENT_DATA;

FragmentLength: Length of the fragment data buffer.
FragmentBuffer: Pointer to the fragment data buffer.

EFI_UDP4_FRAGMENT_DATA allows multiple receive or transmit buffers to be specified. The purpose of this structure is to avoid copying the same packet multiple times.

//**************************************************
// EFI_UDP4_TRANSMIT_DATA
//**************************************************
typedef struct {
  EFI_UDP4_SESSION_DATA      *UdpSessionData;
  EFI_IPv4_ADDRESS           *GatewayAddress;
  UINT32                     DataLength;
  UINT32                     FragmentCount;
  EFI_UDP4_FRAGMENT_DATA     FragmentTable[1];
}  EFI_UDP4_TRANSMIT_DATA;

UdpSessionData: If not NULL, the data that is used to override the transmitting settings. Type EFI_UDP4_SESSION_DATA is defined above.
GatewayAddress: The next-hop address to override the setting from the routing table.
DataLength: Sum of the fragment data length. Must not exceed the maximum UDP packet size.
FragmentCount: Number of fragments.
FragmentTable: Array of fragment descriptors. Type EFI_UDP4_FRAGMENT_DATA is defined above.

The EFI UDPv4 Protocol client must fill this data structure before sending a packet. The packet may contain multiple buffers that may be not in a continuous memory location.

Status Codes Returned

EFI_SUCCESS	The data has been queued for transmission.
EFI_NOT_STARTED	This EFI UDPv4 Protocol instance has not been started.
EFI_NO_MAPPING	When using a default address, configuration (DHCP, BOOTP, RARP, etc.) is not finished yet.
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.TxDat a.FragmentTable[].FragmentLength fields is zero. • One or more of the Token.Packet.TxDat a.FragmentTable[].FragmentBuffer fields is NULL. • Token.Packet.TxData. GatewayAddress is not a unicast IPv4 address if it is not NULL. • Token.Packet.TxD ata.UdpSessionData.SourceAddress is not a valid unicast IPv4 address or Token.Packet.TxData.U dpSessionData.DestinationAddress is zero if the UdpSessionData is not NULL.
EFI_ACCESS_DENIED	The transmit completion token with the same Token.Event was already in the transmit queue.
EFI_NOT_READY	The completion token could not be queued because the transmit queue is full.
EFI_OUT_OF_RESOURCES	Could not queue the transmit data.
EFI_NOT_FOUND	There is no route to the destination network or address.
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_NO_MEDIA	There was a media error.

30.1.2.7. EFI_UDP4_PROTOCOL.Receive()

Summary

Places an asynchronous receive request into the receiving queue.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP4_RECEIVE) (
  IN EFI_UDP4_PROTOCOL             *This,
  IN EFI_UDP4_COMPLETION_TOKEN     *Token
  );

Parameters

This: Pointer to the EFI_UDP4_PROTOCOL instance.
Token: Pointer to a token that is associated with the receive data descriptor. Type EFI_UDP4_COMPLETION_TOKEN is defined in EFI_UDP4_PROTOCOL .Transmit().

Description

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.

Status Codes Returned

EFI_SUCCESS	The receive completion token was cached.
EFI_NOT_STARTED	This EFI UDPv4 Protocol instance has not been started.
EFI_NO_MAPPING	When using a default address, configuration (DHCP, BOOTP, RARP, etc.) is not finished yet.
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE: • This is NULL. • Token is NULL. • Token.Event is NULL.
EFI_OUT_OF_RESOURCES	The receive completion token could not be queued due to a lack of system resources (usually memory).
EFI_DEVICE_ERROR	An unexpected system or network error occurred. The EFI UDPv4 Protocol instance has been reset to startup defaults.
EFI_ACCESS_DENIED	A receive completion token with the same Token.Event was already in the receive queue.
EFI_NOT_READY	The receive request could not be queued because the receive queue is full.
EFI_NO_MEDIA	There was a media error.

30.1.2.8. EFI_UDP4_PROTOCOL.Cancel()

Summary

Aborts an asynchronous transmit or receive request.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP4_CANCEL)(
  IN EFI_UDP4_PROTOCOL           *This,
  IN EFI_UDP4_COMPLETION_TOKEN   *Token OPTIONAL
  );

Parameters

This: Pointer to the EFI_UDP4_PROTOCOL instance.
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. Type EFI_UDP4_COMPLETION_TOKEN is defined in EFI_UDP4_PROTOCOL.Transmit().

Description

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.

Status Codes Returned

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.
EFI_INVALID_PARAMETER	This is NULL.
EFI_NOT_STARTED	This instance has not been started.
EFI_NO_MAPPING	When using the default address, configuration (DHCP, BOOTP, RARP, etc.) is not finished yet.
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().

30.1.2.9. EFI_UDP4_PROTOCOL.Poll()

Summary

Polls for incoming data packets and processes outgoing data packets.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP4_POLL) (
  IN EFI_UDP4_PROTOCOL     *This
  );

Parameters

This: Pointer to the EFI_UDP4_PROTOCOL instance.

Description

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.

Status Codes Returned

EFI_SUCCESS	Incoming or outgoing data was processed.
EFI_INVALID_PARAMETER	This is NULL.
EFI_DEVICE_ERROR	An unexpected system or network error occurred.
EFI_TIMEOUT	Data was dropped out of the transmit and/or receive queue. Consider increasing the polling rate.

30.2. EFI UDPv6 Protocol

This section defines the EFI UDPv6 (User Datagram Protocol version 6) Protocol that interfaces over the EFI IPv6 Protocol.

30.2.1. UDP6 Service Binding Protocol

30.2.1.1. EFI_UDP6_SERVICE_BINDING_PROTOCOL

Summary

The EFI UDPv6 Service Binding Protocol is used to locate communication devices that are supported by an EFI UDPv6 Protocol driver and to create and destroy instances of the EFI UDPv6 Protocol child instance that uses the underlying communications device.

GUID

#define EFI_UDP6_SERVICE_BINDING_PROTOCOL_GUID \
   {0x66ed4721, 0x3c98, 0x4d3e,\
 {0x81, 0xe3, 0xd0, 0x3d, 0xd3, 0x9a, 0x72, 0x54}}

Descriptopn

A network application that requires basic UDPv6 I/O services can use one of the protocol handler services, such as BS->LocateHandleBuffer(), to search for devices that publish a EFI UDPv6 Service Binding Protocol GUID. Each device with a published EFI UDPv6 Service Binding Protocol GUID supports the EFI UDPv6 Protocol and may be available for use.

After a successful call to the EFI_UDP6_SERVICE_BINDING_PROTOCOL.CreateChild() function, the newly created child EFI UDPv6 Protocol driver is in an un-configured state; it is not ready to send and receive data packets.

Before a network application terminates execution, every successful call to the EFI_UDP6_SERVICE_BINDING_PROTOCOL.CreateChild() function must be matched with a call to the EFI_UDP6_SERVICE_BINDING_PROTOCOL.DestroyChild() function.

30.2.2. EFI UDP6 Protocol

30.2.2.1. EFI_UDP6_PROTOCOL

Summary

The EFI UDPv6 Protocol provides simple packet-oriented services to transmit and receive UDP packets.

GUID

#define EFI_UDP6_PROTOCOL_GUID \
  {0x4f948815, 0xb4b9, 0x43cb,\
    {0x8a, 0x33, 0x90, 0xe0, 0x60, 0xb3, 0x49, 0x55}}

Protocol Interface Structure

typedef struct _EFI_UDP6_PROTOCOL {
  EFI_UDP6_GET_MODE_DATA     GetModeData;
  EFI_UDP6_CONFIGURE         Configure;
  EFI_UDP6_GROUPS            Groups;
  EFI_UDP6_TRANSMIT          Transmit;
  EFI_UDP6_RECEIVE           Receive;
  EFI_UDP6_CANCEL            Cancel;
  EFI_UDP6_POLL              Poll;
}  EFI_UDP6_PROTOCOl;

Parameters

GetModeData: Reads the current operational settings. See the GetModeData() function description.
Configure: Initializes, changes, or resets operational settings for the EFI UDPv6 Protocol. See the Configure() function description.
Groups: Joins and leaves multicast groups. See the Groups() function description.
Transmit: Queues outgoing data packets into the transmit queue. This function is a non-blocked operation. See the Transmit() function description.
Receive: Places a receiving request token into the receiving queue. This function is a non-blocked operation. See the Receive() function description.
Cancel: Aborts a pending transmit or receive request. See the Cancel() function description.
Poll: Polls for incoming data packets and processes outgoing data packets. See the Poll() function description.

Description

The EFI_UDP6_PROTOCOL defines an EFI UDPv6 Protocol session that can be used by any network drivers, applications, or daemons to transmit or receive UDP packets. This protocol instance can either be bound to a specified port as a service or connected to some remote peer as an active client. Each instance has its own settings, such as group table, that are independent from each other.

Note

Byte Order: In this document, all IPv6 addresses and incoming/outgoing packets are stored in network byte order. All other parameters in the functions and data structures that are defined in this document are stored in host byte order.

30.2.2.2. EFI_UDP6_PROTOCOL.GetModeData()

Summary

Read the current operational settings.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP6_GET_MODE_DATA) (
  IN EFI_UDP6_PROTOCOL                 *This,
  OUT EFI_UDP6_CONFIG_DATA             *Udp6ConfigData OPTIONAL,
  OUT EFI_IP6_MODE_DATA                *Ip6ModeData OPTIONAL,
  OUT EFI_MANAGED_NETWORK_CONFIG_DATA  *MnpConfigData OPTIONAL,
  OUT EFI_SIMPLE_NETWORK_MODE          *SnpModeData OPTIONAL
  );

Parameters

This: Pointer to the EFI_UDP6_PROTOCOL instance.
Udp6ConfigData: The buffer in which the current UDP configuration data is returned. Type EFI_UDP6_CONFIG_DATA is defined in “Related Definitions” below.
Ip6ModeData: The buffer in which the current EFI IPv6 Protocol mode data is returned. Type EFI_IP6_MODE_DATA is defined in EFI_IP6_PROTOCOL.GetModeData().
MnpConfigData: The buffer in which the current managed network configuration data is returned. Type EFI_MANAGED_NETWORK_CONFIG_DATA is defined in EFI_MANAGED_NETWORK_PROTOCOL.GetModeData().
SnpModeData: The buffer in which the simple network mode data is returned. Type EFI_SIMPLE_NETWORK_MODE is defined in the EFI_SIMPLE_NETWORK Protocol.

Description

The GetModeData() function copies the current operational settings of this EFI UDPv6 Protocol instance into user-supplied buffers. This function is used optionally to retrieve the operational mode data of underlying networks or drivers.

Related Definition

********************************************************
// EFI_UDP6_CONFIG_DATA
//
********************************************************
typedef struct {
  //Receiving Filters

  BOOLEAN              AcceptPromiscuous;
  BOOLEAN              AcceptAnyPort;
  BOOLEAN              AllowDuplicatePort;
  //I/O parameters
  ;

  UINT8                TrafficClass;
  UINT8                HopLimit;
  ;
  UINT32               ReceiveTimeout;
  UINT32               TransmitTimeout;
  //Access Point
  EFI_IPv6_ADDRESS     StationAddress;
  UINT16               StationPort;
  EFI_IPv6_ADDRESS     RemoteAddress;
  UINT16               RemotePort;
}  EFI_UDP6_CONFIG_DATA;

AcceptPromiscuous: Set to TRUE to accept UDP packets that are sent to any address.
AcceptAnyPort: Set to TRUE to accept UDP packets that are sent to any port.
AllowDuplicatePort: Set to TRUE to allow this EFI UDPv6 Protocol child instance to open a port number that is already being used by another EFI UDPv6 Protocol child instance.
TrafficClass: TrafficClass field in transmitted IPv6 packets.
HopLimit: HopLimit field in transmitted IPv6 packets.
ReceiveTimeout: The receive timeout value (number of microseconds) to be associated with each incoming packet. Zero means do not drop incoming packets.
TransmitTimeout: The transmit timeout value (number of microseconds) to be associated with each outgoing packet. Zero means do not drop outgoing packets.
StationAddress: The station IP address that will be assigned to this EFI UDPv6 Protocol instance. The EFI UDPv6 and EFI IPv6 Protocol drivers will only deliver incoming packets whose destination matches this IP address exactly. Address 0:/128 is also accepted as a special case. Under this situation, underlying IPv6 driver is responsible for binding a source address to this EFI IPv6 protocol instance according to source address selection algorithm. Only incoming packet from the selected source address is delivered. This field can be set and changed only when the EFI IPv6 driver is transitioning from the stopped to the started states. If no address is available for selecting, the EFI IPv6 Protocol driver will use EFI_IP6_CONFIG_PROTOCOL to retrieve the IPv6 address.
StationPort: The port number to which this EFI UDPv6 Protocol instance is bound. If a client of the EFI UDPv6 Protocol does not care about the port number, set StationPort to zero. The EFI UDPv6 Protocol driver will assign a random port number to transmitted UDP packets. Ignored it if AcceptAnyPort is TRUE.
RemoteAddress: The IP address of remote host to which this EFI UDPv6 Protocol instance is connecting. If RemoteAddress is not 0:/128, this EFI UDPv6 Protocol instance will be connected to RemoteAddress; i.e., outgoing packets of this EFI UDPv6 Protocol instance will be sent to this address by default and only incoming packets from this address will be delivered to client. Ignored for incoming filtering if AcceptPromiscuous is TRUE.
RemotePort: The port number of the remote host to which this EFI UDPv6 Protocol instance is connecting. If it is not zero, outgoing packets of this EFI UDPv6 Protocol instance will be sent to this port number by default and only incoming packets from this port will be delivered to client. Ignored if RemoteAddress is 0:/128 and ignored for incoming filtering if AcceptPromiscuous is TRUE.

Status Codes Returned

EFI_SUCCESS	The mode data was read.
EFI_NOT_STARTED	When Udp6ConfigData is queried, no configuration data is available because this instance has not been started.
EFI_INVALID_PARAMETER	This is NULL.

30.2.2.3. EFI_UDP6_PROTOCOL.Configure()

Summary

Initializes, changes, or resets the operational parameters for this instance of the EFI UDPv6 Protocol.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP6_CONFIGURE) (
  IN EFI_UDP6_PROTOCOL         *This,
  IN EFI_UDP6_CONFIG_DATA      *UdpConfigData OPTIONAL
  );

Parameters

This: Pointer to the EFI_UDP6_PROTOCOL instance.
UdpConfigData: Pointer to the buffer contained the configuration data.

Description

The Configure() function is used to do the following:

Initialize and start this instance of the EFI UDPv6 Protocol.
Change the filtering rules and operational parameters.
Reset this instance of the EFI UDPv6 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.

Status Codes Returned

EFI_SUCCESS	The configuration settings were set, changed, or reset successfully.
EFI_NO_MAPPING	The underlying IPv6 driver was responsible for choosing a source address for this instance, but no source address was available for use.
EFI_INVALID_PARAMETER	One or more following conditions are TRUE: This is NULL. UdpConfigData.StationAddress neither zero nor one of the configured IP addresses in the underlying IPv6 driver. UdpConfigData.RemoteAddress is not a valid unicast IPv6 address if it is not zero.
EFI_ALREADY_STARTED	The EFI UDPv6 Protocol instance is already started/configured and must be stopped/reset before it can be reconfigured. Only TrafficClass, HopLimit, ReceiveTimeout, and TransmitTimeout can be reconfigured without stopping the current instance of the EFI UDPv6 Protocol.
EFI_ACCESS_DENIED	UdpConfigData. AllowDuplicatePort is FALSE and UdpConfigData.StationPort is already used by other instance.
EFI_OUT_OF_RESOURCES	The EFI UDPv6 Protocol driver cannot allocate memory for this EFI UDPv6 Protocol instance.
EFI_DEVICE_ERROR	An unexpected network or system error occurred and this instance was not opened.

30.2.2.4. EFI_UDP6_PROTOCOL.Groups()

Summary

Joins and leaves multicast groups.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP6_GROUPS) (
  IN EFI_UDP6_PROTOCOL         *This,
  IN BOOLEAN                   JoinFlag,
  IN EFI_IPv6_ADDRESS          *MulticastAddress OPTIONAL
  );

Parameters

This: Pointer to the EFI_UDP6_PROTOCOL instance.
JoinFlag: Set to TRUE to join a multicast group. Set to FALSE to leave one or all multicast groups.
MulticastAddress: Pointer to multicast group address to join or leave.

Description

The Groups () function is used to join or leave one or more multicast group.

If the JoinFlag is FALSE and the MulticastAddress is NULL, then all currently joined groups are left.

Status Codes Returned

EFI_SUCCESS	The operation completed successfully.
EFI_NOT_STARTED	The EFI UDPv6 Protocol instance has not been started.
EFI_OUT_OF_RESOURCES	Could not allocate resources to join the group.
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.
EFI_ALREADY_STARTED	The group address is already in the group table (when JoinFlag is TRUE).
EFI_NOT_FOUND	The group address is not in the group table (when JoinFlag is FALSE).
EFI_DEVICE_ERROR	An unexpected system or network error occurred.

30.2.2.5. EFI_UDP6_PROTOCOL.Transmit()

Summary

Queues outgoing data packets into the transmit queue.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP6_TRANSMIT) (
  IN EFI_UDP6_PROTOCOL           *This,
  IN EFI_UDP6_COMPLETION_TOKEN   *Token
  );

Parameters

This: Pointer to the EFI_UDP6_PROTOCOL instance.
Token: Pointer to the completion token that will be placed into the transmit queue. Type EFI_UDP6_COMPLETION_TOKEN is defined in “Related Definitions” below.

Description

The Transmit() function places a sending request to this instance of the EFI UDPv6 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.

Related Definitions

//***************************************************
// EFI_UDP6_COMPLETION_TOKEN
//***************************************************
typedef struct {
  EFI_EVENT                  Event;
  EFI_STATUS                 Status;
  union {
    EFI_UDP6_RECEIVE_DATA    *RxData;
    EFI_UDP6_TRANSMIT_DATA   *TxData;
   }          Packet;
 }  EFI_UDP6_COMPLETION_TOKEN;

Event: This Event will be signaled after the Status field is updated by the EFI UDPv6 Protocol driver. The type of Event must be EVT_NOTIFY_SIGNAL.
Status: Will be set to one of the following values:

EFI_SUCCESS : The receive or transmit operation completed successfully.

EFI_ABORTED : The receive or transmit was aborted.

EFI_TIMEOUT : The transmit timeout expired.

EFI_NETWORK_UNREACHABLE : The destination network is unreachable. RxData is set to NULL in this situation.

EFI_HOST_UNREACHABLE : The destination host is unreachable. RxData is set to NULL in this situation.

EFI_PROTOCOL_UNREACHABLE : The UDP protocol is unsupported in the remote system. RxData is set to NULL in this situation.

EFI_PORT_UNREACHABLE : No service is listening on the remote port. RxData is set to NULL in this situation.

EFI_ICMP_ERROR : Some other Internet Control Message Protocol (ICMP) error report was received. For example, packets are being sent too fast for the destination to receive them and the destination sent an ICMP source quench report. RxData is set to NULL in this situation.

EFI_DEVICE_ERROR : An unexpected system or network error occurred.

EFI_SECURITY_VIOLATION : The transmit or receive was failed because of IPsec policy check.
RxData: When this token is used for receiving, RxData is a pointer to EFI_UDP6_RECEIVE_DATA. Type EFI_UDP6_RECEIVE_DATA is defined below.
TxData: When this token is used for transmitting, TxData is a pointer to EFI_UDP6_TRANSMIT_DATA. Type EFI_UDP6_TRANSMIT_DATA is defined below.

The EFI_UDP6_COMPLETION_TOKEN structures are used for both transmit and receive operations.

When used for transmitting, the Event and TxData fields must be filled in by the EFI UDPv6 Protocol client. After the transmit operation completes, the Status field is updated by the EFI UDPv6 Protocol and the Event is signaled.

When used for receiving, only the Event field must be filled in by the EFI UDPv6 Protocol client. After a packet is received, RxData and Status are filled in by the EFI UDPv6 Protocol and the Event is signaled.

//***************************************************
// EFI_UDP6_RECEIVE_DATA
//***************************************************
typedef struct {
  EFI_TIME                 TimeStamp;
  EFI_EVENT                RecycleSignal;
  EFI_UDP6_SESSION_DATA    UdpSession;
  UINT32                   DataLength;
  UINT32                   FragmentCount;
  EFI_UDP6_FRAGMENT_DATA   FragmentTable [1];
}  EFI_UDP6_RECEIVE_DATA;

TimeStamp: Time when the EFI UDPv6 Protocol accepted the packet. TimeStamp is zero filled if timestamps are disabled or unsupported.
RecycleSignal: Indicates the event to signal when the received data has been processed.
UdpSession: The UDP session data including SourceAddress, SourcePort, DestinationAddress, and DestinationPort. Type EFI_UDP6_SESSION_DATA is defined below.
DataLength: The sum of the fragment data length.
FragmentCount: Number of fragments. Maybe zero.
FragmentTable: Array of fragment descriptors. Maybe zero. Type EFI_UDP6_FRAGMENT_DATA is defined below.

EFI_UDP6_RECEIVE_DATA is filled by the EFI UDPv6 Protocol driver when this EFI UDPv6 Protocol instance receives an incoming packet. If there is a waiting token for incoming packets, the CompletionToken.Packet.RxData field is updated to this incoming packet and the CompletionToken.Event is signaled. The EFI UDPv6 Protocol client must signal the RecycleSignal after processing the packet.

FragmentTable could contain multiple buffers that are not in the continuous memory locations. The EFI UDPv6 Protocol client might need to combine two or more buffers in FragmentTable to form their own protocol header.

//**********************************************************
// EFI_UDP6_SESSION_DATA
//**********************************************************
typedef struct {
  EFI_IPv6_ADDRESS         SourceAddress;
  UINT16                   SourcePort;
  EFI_IPv6_ADDRESS         DestinationAddress;
  UINT16                   DestinationPort;
}  EFI_UDP6_SESSION_DATA;

SourceAddress: Address from which this packet is sent. This filed should not be used when sending packets.
SourcePort: Port from which this packet is sent. It is in host byte order. This filed should not be used when sending packets.
DestinationAddress: Address to which this packet is sent. When sending packet, it’ll be ignored if it is zero.
DestinationPort: Port to which this packet is sent. When sending packet, it’ll be ignored if it is zero.

The EFI_UDP6_SESSION_DATA is used to retrieve the settings when receiving packets or to override the existing settings (only DestinationAddress and DestinationPort can be overridden) of this EFI UDPv6 Protocol instance when sending packets.

//*********************************************************
// EFI_UDP6_FRAGMENT_DATA
//*********************************************************
typedef struct {
  UINT32         FragmentLength;
  VOID           *FragmentBuffer;
}  EFI_UDP6_FRAGMENT_DATA;

FragmentLength: Length of the fragment data buffer.
FragmentBuffer: Pointer to the fragment data buffer.

EFI_UDP6_FRAGMENT_DATA allows multiple receive or transmit buffers to be specified. The purpose of this structure is to avoid copying the same packet multiple times.

//**********************************************
// EFI_UDP6_TRANSMIT_DATA
//**********************************************
typedef struct {
  EFI_UDP6_SESSION_DATA        *UdpSessionData;
  UINT32                       DataLength;
  UINT32                       FragmentCount;
  EFI_UDP6_FRAGMENT_DATA       FragmentTable [1];
}  EFI_UDP6_TRANSMIT_DATA;

UdpSessionData If not NULL, the data that is used to override the transmitting settings. Only the two filed UdpSessionData.DestinationAddress and UdpSessionData.DestionPort can be used as the transmitting setting filed. Type EFI_UDP6_SESSION_DATA is defined above.

DataLength: Sum of the fragment data length. Must not exceed the maximum UDP packet size.
FragmentCount: Number of fragments.
FragmentTable: Array of fragment descriptors. Type EFI_UDP6_FRAGMENT_DATA is defined above.

The EFI UDPv6 Protocol client must fill this data structure before sending a packet. The packet may contain multiple buffers that may be not in a continuous memory location.

Status Codes Returned

EFI_SUCCESS	The data has been queued for transmission.
EFI_NOT_STARTED	This EFI UDPv6 Protocol instance has not been started.
EFI_NO_MAPPING	The underlying IPv6 driver was responsible for choosing a source address for this instance, but no source address was available for use.
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.TxDat a.FragmentTable[].FragmentLength fields is zero. One or more of the Token.Packet.TxDat a.FragmentTable[].FragmentBuffer fields is NULL. Token.Packet.TxData.UdpSessionData. DestinationAddress is not zero and is not valid unicast Ipv6 address if UdpSessionData is not NULL. Token.Packet.TxData.UdpSessionData is NULL and this instance’s UdpConfigData. RemoteAddress is unspecified. Token.Packet.TxData. UdpSessionData.DestinationAddress is non-zero when DestinationAddress is configured as non-zero when doing Configure() for this EFI Udp6 protocol instance. Token.Packet.TxData.UdpSesionData.DestinationAddress is zero when DestinationAddress is unspecified when doing Configure() for this EFI Udp6 protocol instance
EFI_ACCESS_DENIED	The transmit completion token with the same Token.Event was already in the transmit queue.
EFI_NOT_READY	The completion token could not be queued because the transmit queue is full.
EFI_OUT_OF_RESOURCES	Could not queue the transmit data.
EFI_NOT_FOUND	There is no route to the destination network or address.
EFI_BAD_BUFFER_SIZE	The data length is greater than the maximum UDP packet size.
EFI_NO_MEDIA	There was a media error.

30.2.2.6. EFI_UDP6_PROTOCOL.Receive()

Summary

Places an asynchronous receive request into the receiving queue.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP6_RECEIVE) (
  IN EFI_UDP6_PROTOCOL           *This,
  IN EFI_UDP6_COMPLETION_TOKEN   *Token*
  );

Parameters

This: Pointer to the EFI_UDP6_PROTOCOL instance.
Token: Pointer to a token that is associated with the receive data descriptor. Type EFI_UDP6_COMPLETION_TOKEN is defined in EFI_UDP6_PROTOCOL.Transmit().

Description

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 UDPv6 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.

Status Codes Returned

EFI_SUCCESS	The receive completion token was cached.
EFI_NOT_STARTED	This EFI UDPv6 Protocol instance has not been started.
EFI_NO_MAPPING	The underlying IPv6 driver was responsible for choosing a source address for this instance, but no source address was available for use.
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE: This is NULL. Token is NULL. Token.Event is NULL.
EFI_OUT_OF_RESOURCES	The receive completion token could not be queued due to a lack of system resources (usually memory).
EFI_DEVICE_ERROR	An unexpected system or network error occurred. The EFI UDPv6 Protocol instance has been reset to startup defaults.
EFI_ACCESS_DENIED	A receive completion token with the same Token.Event was already in the receive queue.
EFI_NOT_READY	The receive request could not be queued because the receive queue is full.
EFI_NO_MEDIA	There was a media error.

30.2.2.7. EFI_UDP6_PROTOCOL.Cancel()

Summary

Aborts an asynchronous transmit or receive request.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP6_CANCEL)(
  IN EFI_UDP6_PROTOCOL           *This,
  IN EFI_UDP6_COMPLETION_TOKEN   *Token OPTIONAL
  );

Parameters

This: Pointer to the EFI_UDP6_PROTOCOL instance.
Token: Pointer to a token that has been issued by EFI_UDP6_PROTOCOL.Transmit() or EFI_UDP6_PROTOCOL.Receive() .If NULL, all pending tokens are aborted. Type EFI_UDP6_COMPLETION_TOKEN is defined in EFI_UDP6_PROTOCOL.Transmit().

Description

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.

Status Codes Returned

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.
EFI_INVALID_PARAMETER	This is NULL.
EFI_NOT_STARTED	This instance has not been started.
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().

30.2.2.8. EFI_UDP6_PROTOCOL.Poll()

Summary

Polls for incoming data packets and processes outgoing data packets.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_UDP6_POLL) (
  IN EFI_UDP6_PROTOCOL     *This
  );

Parameters

This: Pointer to the EFI_UDP6_PROTOCOL instance.

Description

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.

Status Codes Returned

EFI_SUCCESS	Incoming or outgoing data was processed.
EFI_INVALID_PARAMETER	This is NULL.
EFI_DEVICE_ERROR	An unexpected system or network error occurred.
EFI_TIMEOUT	Data was dropped out of the transmit and/or receive queue. Consider increasing the polling rate.

30.3. EFI MTFTPv4 Protocol

The following sections defines the EFI MTFTPv4 Protocol interface that is built upon the EFI UDPv4 Protocol.

30.3.1. EFI_MTFTP4_SERVICE_BINDING_PROTOCOL

Summary

The EFI MTFTPv4 Service Binding Protocol is used to locate communication devices that are supported by an EFI MTFTPv4 Protocol driver and to create and destroy instances of the EFI MTFTPv4 Protocol child protocol driver that can use the underlying communications device.

GUID

#define EFI_MTFTP4_SERVICE_BINDING_PROTOCOL_GUID \
  {0x2e800be,0x8f01,0x4aa6,\
    {0x94,0x6b,0xd7,0x13,0x88,0xe1,0x83,0x3f}}

Description

A network application or driver that requires MTFTPv4 I/O services can use one of the protocol handler services, such as BS->LocateHandleBuffer(), to search for devices that publish an EFI MTFTPv4 Service Binding Protocol GUID. Each device with a published EFI MTFTPv4 Service Binding Protocol GUID supports the EFI MTFTPv4 Protocol service and may be available for use.

After a successful call to the EFI_MTFTP4_SERVICE_BINDING_PROTOCOL.CreateChild() function, the newly created child EFI MTFTPv4 Protocol driver instance is in an unconfigured state; it is not ready to transfer data.

Before a network application terminates execution, every successful call to the EFI_MTFTP4_SERVICE_BINDING_PROTOCOL.CreateChild() function must be matched with a call to the EFI_MTFTP4_SERVICE_BINDING_PROTOCOL.DestroyChild() function.

Each instance of the EFI MTFTPv4 Protocol driver can support one file transfer operation at a time. To download two files at the same time, two instances of the EFI MTFTPv4 Protocol driver will need to be created.

30.3.2. EFI_MTFTP4_PROTOCOL

Summary

The EFI MTFTPv4 Protocol provides basic services for client-side unicast and/or multicast TFTP operations.

GUID

#define EFI_MTFTP4_PROTOCOL_GUID \
  {0x78247c57,0x63db,0x4708,\
    {0x99,0xc2,0xa8,0xb4,0xa9,0xa6,0x1f,0x6b}}

Protocol Interface Structure

typedef struct _EFI_MTFTP4_PROTOCOL {
  EFI_MTFTP4_GET_MODE_DATA     GetModeData;
  EFI_MTFTP4_CONFIGURE         Configure;
  EFI_MTFTP4_GET_INFO          GetInfo;
  EFI_MTFTP4_PARSE_OPTIONS     ParseOptions;
  EFI_MTFTP4_READ_FILE         ReadFile;
  EFI_MTFTP4_WRITE_FILE        WriteFile;
  EFI_MTFTP4_READ_DIRECTORY    ReadDirectory;
  EFI_MTFTP4_POLL              Poll;
}  EFI_MTFTP4_PROTOCOL;

Parameters

GetModeData: Reads the current operational settings. See the GetModeData() function description.
Configure: Initializes, changes, or resets the operational settings for this instance of the EFI MTFTPv4 Protocol driver. See the Configure() function description.
GetInfo: Retrieves information about a file from an MTFTPv4 server. See the GetInfo() function description.
ParseOptions: Parses the options in an MTFTPv4 OACK (options acknowledgement) packet. See the ParseOptions() function description.
ReadFile: Downloads a file from an MTFTPv4 server. See the ReadFile() function description.
WriteFile: Uploads a file to an MTFTPv4 server. This function may be unsupported in some EFI implementations. See the WriteFile() function description.
ReadDirectory: Downloads a related file “directory” from an MTFTPv4 server. This function may be unsupported in some EFI implementations. See the ReadDirectory() function description.
Poll: Polls for incoming data packets and processes outgoing data packets. See the Poll() function description.

Description

The EFI_MTFTP4_PROTOCOL is designed to be used by UEFI drivers and applications to transmit and receive data files. The EFI MTFTPv4 Protocol driver uses the underlying EFI UDPv4 Protocol driver and EFI IPv4 Protocol driver.

30.3.3. EFI_MTFTP4_PROTOCOL.GetModeData()

Summary

Reads the current operational settings.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP4_GET_MODE_DATA)(
  IN EFI_MTFTP4_PROTOCOL         *This,
  OUT EFI_MTFTP4_MODE_DATA       *ModeData
  );

Parameters

This: Pointer to the EFI_MTFTP4_PROTOCOL instance.
ModeData: Pointer to storage for the EFI MTFTPv4 Protocol driver mode data. Type EFI_MTFTP4_MODE_DATA is defined in “Related Definitions” below.

Description

The GetModeData() function reads the current operational settings of this EFI MTFTPv4 Protocol driver instance.

Related Definitions

//************************************************
// EFI_MTFTP4_MODE_DATA
//************************************************
typedef struct {
  EFI_MTFTP4_CONFIG_DATA   ConfigData;
  UINT8                    SupportedOptionCount;
  UINT8                    **SupportedOptions;
  UINT8                    UnsupportedOptionCount;
  UINT8                    **UnsupportedOptions;
}  EFI_MTFTP4_MODE_DATA;

ConfigData: The configuration data of this instance. Type EFI_MTFTP4_CONFIG_DATA is defined below.
SupportedOptionCount: The number of option strings in the following SupportedOptions array.
SupportedOptions: An array of pointers to null-terminated ASCII option strings that are recognized and supported by this EFI MTFTPv4 Protocol driver implementation.
UnsupportedOptionCount: An array of pointers to null-terminated ASCII option strings that are recognized but not supported by this EFI MTFTPv4 Protocol driver implementation.
UnsupportedOptions: An array of option strings that are recognized but are not supported by this EFI MTFTPv4 Protocol driver implementation.

The EFI_MTFTP4_MODE_DATA structure describes the operational state of this instance.

//******************************************************
// EFI_MTFTP4_CONFIG_DATA
//******************************************************
typedef struct {
  BOOLEAN              UseDefaultSetting;
  EFI_IPv4_ADDRESS     StationIp;
  EFI_IPv4_ADDRESS     SubnetMask;
  UINT16               LocalPort;
  EFI_IPv4_ADDRESS     GatewayIp;
  EFI_IPv4_ADDRESS     ServerIp;
  UINT16               InitialServerPort;
  UINT16               TryCount;
  UINT16               TimeoutValue;
}  EFI_MTFTP4_CONFIG_DATA;

UseDefaultSetting: Set to TRUE to use the default station address/subnet mask and the default route table information.
StationIp: If UseDefaultSetting is FALSE, indicates the station address to use.
SubnetMask: If UseDefaultSetting is FALSE, indicates the subnet mask to use.
LocalPort: Local port number. Set to zero to use the automatically assigned port number.
GatewayIp: If UseDefaultSetting is FALSE, indicates the gateway IP address to use.
ServerIp: The IP address of the MTFTPv4 server.
InitialServerPort: The initial MTFTPv4 server port number. Request packets are sent to this port. This number is almost always 69 and using zero defaults to 69.
TryCount: The number of times to transmit MTFTPv4 request packets and wait for a response.
TimeoutValue: The number of seconds to wait for a response after sending the MTFTPv4 request packet.

The EFI_MTFTP4_CONFIG_DATA structure is used to report and change MTFTPv4 session parameters.

Status Codes Returned

EFI_SUCCESS	The configuration data was successfully returned.
EFI_OUT_OF_RESOURCES	The required mode data could not be allocated.
EFI_INVALID_PARAMETER	This is NULL or ModeData is NULL.

30.3.4. EFI_MTFTP4_PROTOCOL.Configure()

Summary

Initializes, changes, or resets the default operational setting for this EFI MTFTPv4 Protocol driver instance.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP4_CONFIGURE)(
  IN EFI_MTFTP4_PROTOCOL         *This,
  IN EFI_MTFTP4_CONFIG_DATA      *MtftpConfigData OPTIONAL
  );

Parameters

This: Pointer to the EFI_MTFTP4_PROTOCOL instance.
MtftpConfigData: Pointer to the configuration data structure. Type EFI_MTFTP4_CONFIG_DATA is defined in EFI_MTFTP4_PROTOCOL .GetModeData().

Description

The Configure() function is used to set and change the configuration data for this EFI MTFTPv4 Protocol driver instance. The configuration data can be reset to startup defaults by calling Configure() with MtftpConfigData set to NULL. Whenever the instance is reset, any pending operation is aborted. By changing the EFI MTFTPv4 Protocol driver instance configuration data, the client can connect to different MTFTPv4 servers. The configuration parameters in MtftpConfigData are used as the default parameters in later MTFTPv4 operations and can be overridden in later operations.

Status Codes Returned

EFI_SUCCESS	The EFI MTFTPv4 Protocol driver was configured successfully.
EFI_INVALID_PARAMETER	One or more following conditions are TRUE: • This is NULL. • MtftpConfigData.UseDefaultSetting is FALSE and MtftpConfigData.StationIp is not a valid IPv4 unicast address. • MtftpCofigData.UseDefaultSetting is FALSE and MtftpConfigData.SubnetMask is invalid. • MtftpCofigData.ServerIp is not a valid IPv4 unicast address. • MtftpConfigData.UseDefaultSetting is FALSE and MtftpConfigData.GatewayIp is not a valid IPv4 unicast address or is not in the same subnet with station address.
EFI_ACCESS_DENIED	The EFI configuration could not be changed at this time because there is one MTFTP background operation in progress.
EFI_NO_MAPPING	When using a default address, configuration (DHCP, BOOTP, RARP, etc.) has not finished yet.
EFI_UNSUPPORTED	A configuration protocol (DHCP, BOOTP, RARP, etc.) could not be located when clients choose to use the default address settings.
EFI_OUT_OF_RESOURCES	The EFI MTFTPv4 Protocol driver instance data could not be allocated.
EFI_DEVICE_ERROR	An unexpected system or network error occurred. The EFI MTFTPv4 Protocol driver instance is not configured.

30.3.5. EFI_MTFTP4_PROTOCOL.GetInfo()

Summary

Gets information about a file from an MTFTPv4 server.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP4_GET_INFO)(
  IN EFI_MTFTP4_PROTOCOL         *This,
  IN EFI_MTFTP4_OVERRIDE_DATA    *OverrideData OPTIONAL,
  IN UINT8                       *Filename,
  IN UINT8                       *ModeStr OPTIONAL,
  IN UINT8                       OptionCount,
  IN EFI_MTFTP4_OPTION           *OptionList OPTIONAL,
  OUT UINT32                     *PacketLength,
  OUT EFI_MTFTP4_PACKET          **Packet OPTIONAL
  );

Parameters

This: Pointer to the EFI_MTFTP4_PROTOCOL instance.
OverrideData: Data that is used to override the existing parameters. If NULL, the default parameters that were set in the EFI_MTFTP4_PROTOCOL .Configure() function are used. Type EFI_MTFTP4_OVERRIDE_DATA is defined in “Related Definitions” below.
Filename: Pointer to a null-terminated ASCII file name string.
ModeStr: Pointer to a null-terminated ASCII mode string. If NULL, “octet” will be used.
OptionCount: Number of option/value string pairs in OptionList.
OptionList: Pointer to array of option/value string pairs. Ignored if OptionCount is zero. Type EFI_MTFTP4_OPTION is defined in “Related Definitions” below.
PacketLength: The number of bytes in the returned packet.
Packet: The pointer to the received packet. This buffer must be freed by the caller. Type EFI_MTFTP4_PACKET is defined in “Related Definitions” below.

Description

The GetInfo() function assembles an MTFTPv4 request packet with options; sends it to the MTFTPv4 server; and may return an MTFTPv4 OACK, MTFTPv4 ERROR, or ICMP ERROR packet. Retries occur only if no response packets are received from the MTFTPv4 server before the timeout expires.

Related Definitions

//**************************************************
// EFI_MTFTP_OVERRIDE_DATA
//**************************************************
typedef struct {
  EFI_IPv4_ADDRESS       GatewayIp;
  EFI_IPv4_ADDRESS       ServerIp;
  UINT16                 ServerPort;
  UINT16                 TryCount;
  UINT16                 TimeoutValue;
}  EFI_MTFTP4_OVERRIDE_DATA;

GatewayIp: IP address of the gateway. If set to 0.0.0.0, the default gateway address that was set by the EFI_MTFTP4_PROTOCOL .Configure() function will not be overridden.
ServerIp: IP address of the MTFTPv4 server. If set to 0.0.0.0, it will use the value that was set by the EFI_MTFTP4_PROTOCOL .Configure() function.
ServerPort: MTFTPv4 server port number. If set to zero, it will use the value that was set by the EFI_MTFTP4_PROTOCOL .Configure() function.
TryCount: Number of times to transmit MTFTPv4 request packets and wait for a response. If set to zero, it will use the value that was set by the EFI_MTFTP4_PROTOCOL .Configure() function.
TimeoutValue: Number of seconds to wait for a response after sending the MTFTPv4 request packet. If set to zero, it will use the value that was set by the EFI_MTFTP4_PROTOCOL .Configure() function.

The EFI_MTFTP4_OVERRIDE_DATA structure is used to override the existing parameters that were set by the EFI_MTFTP4_PROTOCOL .Configure() function.

//********************************************************
// EFI_MTFTP4_OPTION
//********************************************************
typedef struct {
  UINT8            *OptionStr;
  UINT8            *ValueStr;
}  EFI_MTFTP4_OPTION;

OptionStr: Pointer to the null-terminated ASCII MTFTPv4 option string.
ValueStr: Pointer to the null-terminated ASCII MTFTPv4 value string.

#pragma pack(1)

//*********************************************
// EFI_MTFTP4_PACKET
//*********************************************
typedef union {
  UINT16                     OpCode;
  EFI_MTFTP4_REQ_HEADER      Rrq, Wrq;
  EFI_MTFTP4_OACK_HEADER     Oack;
  EFI_MTFTP4_DATA_HEADER     Data;
  EFI_MTFTP4_ACK_HEADER      Ack;
// This field should be ignored and treated as reserved
  EFI_MTFTP4_DATA8_HEADER     Data8;
// This field should be ignored and treated as reserved
  EFI_MTFTP4_ACK8_HEADER     Ack8;
  EFI_MTFTP4_ERROR_HEADER    Error;
}  EFI_MTFTP4_PACKET;

//*********************************************
// EFI_MTFTP4_REQ_HEADER
//*********************************************
typedef struct {
  UINT16                     OpCode;
  UINT8                      Filename[1];
} EFI_MTFTP4_REQ_HEADER;

//*********************************************
// EFI_MTFTP4_OACK_HEADER
//*********************************************
typedef struct {
  UINT16                     OpCode;
  UINT8                      Data[1];
}  EFI_MTFTP4_OACK_HEADER;

//*********************************************
// EFI_MTFTP4_DATA_HEADER
//*********************************************
typedef struct {
  UINT16                     OpCode;
  UINT16                     Block;
  UINT8                      Data[1];
}  EFI_MTFTP4_DATA_HEADER;

//*********************************************
// EFI_MTFTP4_ACK_HEADER
//*********************************************
typedef struct {
  UINT16                     OpCode;
  UINT16                     Block[1];
}  EFI_MTFTP4_ACK_HEADER;

//*********************************************
// EFI_MTFTP4_DATA8_HEADER
// This field should be ignored and treated as reserved
//*********************************************
typedef struct {
  UINT16                     OpCode;
  UINT64                     Block;
  UINT8                      Data[1];
}  EFI_MTFTP4_DATA8_HEADER;

//*********************************************
// EFI_MTFTP4_ACK8_HEADER
// This field should be ignored and treated as reserved
//*********************************************
typedef struct {
  UINT16                     OpCode;
  UINT64                     Block[1];
}  EFI_MTFTP4_ACK8_HEADER;

//*********************************************
// EFI_MTFTP4_ERROR_HEADER
//*********************************************
typedef struct {
  UINT16                     OpCode;
  UINT16                     ErrorCode;
  UINT8                      ErrorMessage[1];
}  EFI_MTFTP4_ERROR_HEADER;

#pragma pack()

Table, below, Descriptions of Parameters in MTFTPv4 PacketStructures describes the parameters that are listed in the MTFTPv4 packet structure definitions above. All the above structures are byte packed. The pragmas may vary from compiler to compiler. The MTFTPv4 packet structures are also used by the following functions:

EFI_MTFTP4_PROTOCOL .ReadFile()
EFI_MTFTP4_PROTOCOL .WriteFile()
EFI_MTFTP4_PROTOCOL .ReadDirectory()
The EFI MTFTPv4 Protocol packet check callback functions

NOTE: Both incoming and outgoing MTFTPv4 packets are in network byte order. All other parameters defined in functions or data structures are stored in host byte order.

Table 30.1 Descriptions of Parameters in MTFTPv4 PacketStructures
Data Structure	Parameter	Description
EFI_MTFTP4_PACKET	OpCode	Type of packets as defined by the MTFTPv4 packet opcodes. Opcode values are defined below.
	Rrq, Wrq	Read request or write request packet header. See the description for EFI_MTFTP4_REQ_HEADER below in this table
	Oack	Option acknowledge packet header. See the description for EFI_MTFTP4_OACK_HEADER below in this table.
	Data	Data packet header. See the description for EFI_MTFTP4_DATA_HEADER below in this table.
	Ack	Acknowledgement packet header. See the description for EFI_MTFTP4_ACK_HEADER below in this table.
	Data8	This field should be ignored and treated as reserved. Data packet header with big block number. See the description for EFI_MTFTP4_DATA8_HEADER below in this table.
	Ack8	This field should be ignored and treated as reserved. Acknowledgement header with big block number. See the description for EFI_MTFTP4_ACK8_HEADER below in this table.
	Error	Error packet header. See the description for EFI_MTFTP4_ERROR_HEADER below in this table.
EFI_MTFTP4_REQ_HEADER	OpCode	For this packet type, OpCode = EFI_MTFTP4_OPCODE_RRQ for a read request or OpCode = EFI_MTFTP4_OPCODE_WRQ for a write request.
	Filename	The file name to be downloaded or uploaded.
EFI_MTFTP4_OACK_HEADER	OpCode	For this packet type, OpCode = EFI_MTFTP4_OPCODE_OACK.
	Data	The option strings in the option acknowledgement packet.
EFI_MTFTP4_DATA_HEADER	OpCode	For this packet type, OpCode = EFI_MTFTP4_OPCODE_DATA.
	Block	Block number of this data packet.
	Data	The content of this data packet.
EFI_MTFTP4_ACK_HEADER	OpCode	For this packet type, OpCode = EFI_MTFTP4_OPCODE_ACK.
	Block	The block number of the data packet that is being acknowledged.
EFI_MTFTP4_DATA8_HEADER	OpCode	This field should be ignored and treated as reserved. For this packet type, OpCode = EFI_MTFTP4_OPCODE_DATA8.
	Block	This field should be ignored and treated as reserved. The block number of data packet.
	Data	This field should be ignored and treated as reserved. The content of this data packet.
EFI_MTFTP4_ACK8_HEADER	OpCode	This field should be ignored and treated as reserved. For this packet type, OpCode = EFI_MTFTP4_OPCODE_ACK8.
	Block	This field should be ignored and treated as reserved. The block number of the data packet that is being acknowledged.
EFI_MTFTP4_ERROR_HEADER	OpCode	For this packet type, OpCode = EFI_MTFTP4_OPCODE_ERROR.
	ErrorCode	The error number as defined by the MTFTPv4 packet error codes. Values for ErrorCode are defined below.
	ErrorMessage	Error message string.

//
// MTFTP Packet OpCodes
//
#define EFI_MTFTP4_OPCODE_RRQ    1
#define EFI_MTFTP4_OPCODE_WRQ    2
#define EFI_MTFTP4_OPCODE_DATA   3
#define EFI_MTFTP4_OPCODE_ACK    4
#define EFI_MTFTP4_OPCODE_ERROR  5
#define EFI_MTFTP4_OPCODE_OACK   6
#define EFI_MTFTP4_OPCODE_DIR    7
//This field should be ignored and treated as reserved.
#define EFI_MTFTP4_OPCODE_DATA8  8
//This field should be ignored and treated as reserved.
#define EFI_MTFTP4_OPCODE_ACK8   9

Following is a description of the fields in the above definition.

EFI_MTFTP4_OPCODE_RRQ	The MTFTPv4 packet is a read request.
EFI_MTFTP4_OPCODE_WRQ	The MTFTPv4 packet is a write request.
EFI_MTFTP4_OPCODE_DATA	The MTFTPv4 packet is a data packet.
EFI_MTFTP4_OPCODE_ACK	The MTFTPv4 packet is an acknowledgement packet.
EFI_MTFTP4_OPCODE_ERROR	The MTFTPv4 packet is an error packet.
EFI_MTFTP4_OPCODE_OACK	The MTFTPv4 packet is an option acknowledgement packet.
EFI_MTFTP4_OPCODE_DIR	The MTFTPv4 packet is a directory query packet.
EFI_MTFTP4_OPCODE_DATA8	This field should be ignored and treated as reserved. The MTFTPv4 packet is a data packet with a big block number.
EFI_MTFTP4_OPCODE_ACK8	This field should be ignored and treated as reserved. The MTFTPv4 packet is an acknowledgement packet with a big block number.

//
// MTFTP ERROR Packet ErrorCodes
//
#define EFI_MTFTP4_ERRORCODE_NOT_DEFINED         0
#define EFI_MTFTP4_ERRORCODE_FILE_NOT_FOUND      1
#define EFI_MTFTP4_ERRORCODE_ACCESS_VIOLATION    2
#define EFI_MTFTP4_ERRORCODE_DISK_FULL           3
#define EFI_MTFTP4_ERRORCODE_ILLEGAL_OPERATION   4
#define EFI_MTFTP4_ERRORCODE_UNKNOWN_TRANSFER_ID 5
#define EFI_MTFTP4_ERRORCODE_FILE_ALREADY_EXISTS 6
#define EFI_MTFTP4_ERRORCODE_NO_SUCH_USER        7
#define EFI_MTFTP4_ERRORCODE_REQUEST_DENIED      8

EFI_MTFTP4_ERRORCODE_NOT_DEFINED	The error code is not defined. See the error message in the packet (if any) for details.
EFI_MTFTP4_ERRORCODE_FILE_NOT_FOUND	The file was not found.
EFI_MTFTP4_ERRORCODE_ACCESS_VIOLATION	There was an access violation.
EFI_MTFTP4_ERRORCODE_DISK_FULL	The disk was full or its allocation was exceeded.
EFI_MTFTP4_ERRORCODE_ILLEGAL_OPERATION	The MTFTPv4 operation was illegal.
EFI_MTFTP4_ERRORCODE_UNKNOWN_TRANSFER_ID	The transfer ID is unknown.
EFI_MTFTP4_ERRORCODE_FILE_ALREADY_EXISTS	The file already exists.
EFI_MTFTP4_ERRORCODE_NO_SUCH_USER	There is no such user.
EFI_MTFTP4_ERRORCODE_REQUEST_DENIED	The request has been denied due to option negotiation.

Status Codes Returned

EFI_SUCCESS	An MTFTPv4 OACK packet was received and is in the Packet.
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE: • This is NULL. • Filename is NULL. • OptionCount is not zero and OptionList is NULL. • One or more options in OptionList have wrong format. • PacketLength is NULL. • One or more IPv4 addresses in OverrideData are not valid unicast IPv4 addresses if OverrideData is not NULL and the addresses are not set to all zero.
EFI_UNSUPPORTED	• One or more options in the OptionList are in the unsupported list of structure EFI_MTFTP4_MODE_DATA.
EFI_NOT_STARTED	The EFI MTFTPv4 Protocol driver has not been started.
EFI_NO_MAPPING	When using a default address, configuration (DHCP, BOOTP, RARP, etc.) has not finished yet.
EFI_ACCESS_DENIED	The previous operation has not completed yet.
EFI_OUT_OF_RESOURCES	Required system resources could not be allocated.
EFI_TFTP_ERROR	An MTFTPv4 ERROR packet was received and is in the Packet.
EFI_NETWORK_UNREACHABLE	An ICMP network unreachable error packet was received and the Packet is set to NULL.
EFI_HOST_UNREACHABLE	An ICMP host unreachable error packet was received and the Packet is set to NULL.
EFI_PROTOCOL_UNREACHABLE	An ICMP protocol unreachable error packet was received and the Packet is set to NULL.
EFI_PORT_UNREACHABLE	An ICMP port unreachable error packet was received and the Packet is set to NULL.
EFI_ICMP_ERROR	Some other ICMP ERROR packet was received and the Packet is set to NULL.
EFI_PROTOCOL_ERROR	An unexpected MTFTPv4 packet was received and is in the Packet.
EFI_TIMEOUT	No responses were received from the MTFTPv4 server.
EFI_DEVICE_ERROR	An unexpected network error or system error occurred.
EFI_NO_MEDIA	There was a media error.

30.3.6. EFI_MTFTP4_PROTOCOL.ParseOptions()

Summary

Parses the options in an MTFTPv4 OACK packet.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP4_PARSE_OPTIONS)(
  IN EFI_MTFTP4_PROTOCOL       *This,
  IN UINT32                    PacketLen,
  IN EFI_MTFTP4_PACKET         *Packet,
  OUT UINT32                   *OptionCount,
  OUT EFI_MTFT4P_OPTION        **OptionList OPTIONAL
  );

Parameters

This: Pointer to the EFI_MTFTP4_PROTOCOL instance.
PacketLen: Length of the OACK packet to be parsed.
Packet: Pointer to the OACK packet to be parsed. Type EFI_MTFTP4_PACKET is defined in EFI_MTFTP4_PROTOCOL .GetInfo().
OptionCount: Pointer to the number of options in following OptionList.
OptionList: Pointer to EFI_MTFTP4_OPTION storage. Call the EFI Boot Service FreePool() to release the OptionList if the options in this OptionList are not needed any more. Type EFI_MTFTP4_OPTION is defined in EFI_MTFTP4_PROTOCOL .GetInfo().

Description

The ParseOptions() function parses the option fields in an MTFTPv4 OACK packet and returns the number of options that were found and optionally a list of pointers to the options in the packet.

If one or more of the option fields are not valid, then EFI_PROTOCOL_ERROR is returned and **OptionCount* and **OptionList* stop at the last valid option.

Status Codes Returned

EFI_SUCCESS	The OACK packet was valid and the OptionCount and OptionList parameters have been updated.
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE: • PacketLen is 0. • Packet is NULL or Packet is not a valid MTFTPv4 packet. • OptionCount is NULL.
EFI_NOT_FOUND	No options were found in the OACK packet.
EFI_OUT_OF_RESOURCES	Storage for the OptionList array cannot be allocated.
EFI_PROTOCOL_ERROR	One or more of the option fields is invalid.

30.3.7. EFI_MTFTP4_PROTOCOL.ReadFile()

Summary

Downloads a file from an MTFTPv4 server.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP4_READ_FILE)(
  IN EFI_MTFTP4_PROTOCOL       *This,
  IN EFI_MTFTP4_TOKEN          *Token
  );

Parameters

This: Pointer to the EFI_MTFTP4_PROTOCOL instance.
Token: Pointer to the token structure to provide the parameters that are used in this operation. Type EFI_MTFTP4_TOKEN is defined in “Related Definitions” below.

Description

The ReadFile() function is used to initialize and start an MTFTPv4 download process and optionally wait for completion. When the download operation completes, whether successfully or not, the Token.Status field is updated by the EFI MTFTPv4 Protocol driver and then Token.Event is signaled (if it is not NULL).

Data can be downloaded from the MTFTPv4 server into either of the following locations:

A fixed buffer that is pointed to by Token.Buffer
A download service function that is pointed to by Token.CheckPacket

If both Token.Buffer and Token.CheckPacket are used, then Token.CheckPacket will be called first. If the call is successful, the packet will be stored in Token.Buffer.

Related Definitions

//******************************************************
// EFI_MTFTP4_TOKEN
//******************************************************
typedef struct {
  EFI_STATUS                  Status;
  EFI_EVENT                   Event;
  EFI_MTFTP4_OVERRIDE_DATA    *OverrideData;
  UINT8                       *Filename;
  UINT8                       *ModeStr;
  UINT32                      OptionCount;
  EFI_MTFTP4_OPTION           *OptionList;
  UINT64                      BufferSize;
  VOID                        *Buffer;
  VOID                        *Context;
  EFI_MTFTP4_CHECK_PACKET     CheckPacket;
  EFI_MTFTP4_TIMEOUT_CALLBACK TimeoutCallback;
  EFI_MTFTP4_PACKET_NEEDED    PacketNeeded;
}   EFI_MTFTP4_TOKEN;

Status: The status that is returned to the caller at the end of the operation to indicate whether this operation completed successfully. Defined Status values are listed below.
Event: The event that will be signaled when the operation completes. If set to NULL, the corresponding function will wait until the read or write operation finishes. The type of Event must be EVT_NOTIFY_SIGNAL. The Task Priority Level (TPL) of Event must be lower than or equal to TPL_CALLBACK.
OverrideData: If not NULL, the data that will be used to override the existing configure data. Type EFI_MTFTP4_OVERRIDE_DATA is defined in EFI_MTFTP4_PROTOCOL .GetInfo().
Filename: Pointer to the null-terminated ASCII file name string.
ModeStr: Pointer to the null-terminated ASCII mode string. If NULL, “octet” is used.
OptionCount: Number of option/value string pairs.
OptionList: Pointer to an array of option/value string pairs. Ignored if OptionCount is zero. Both a remote server and this driver implementation should support these options. If one or more options are unrecognized by this implementation, it is sent to the remote server without being changed. Type EFI_MTFTP4_OPTION is defined in EFI_MTFTP4_PROTOCOL .GetInfo().
BufferSize: On input, the size, in bytes, of Buffer. On output, the number of bytes transferred
Buffer: Pointer to the data buffer. Data that is downloaded from the MTFTPv4 server is stored here. Data that is uploaded to the MTFTPv4 server is read from here. Ignored if BufferSize is zero.
Context: Pointer to the context that will be used by CheckPacket, TimeoutCallback and PacketNeeded.
CheckPacket: Pointer to the callback function to check the contents of the received packet. Type EFI_MTFTP4_CHECK_PACKET is defined below.
TimeoutCallback: Pointer to the function to be called when a timeout occurs. Type EFI_MTFTP4_TIMEOUT_CALLBACK is defined below.
PacketNeeded: Pointer to the function to provide the needed packet contents. Only used in WriteFile() operation. Type EFI_MTFTP4_PACKET_NEEDED is defined below.

The EFI_MTFTP4_TOKEN structure is used for both the MTFTPv4 reading and writing operations. The caller uses this structure to pass parameters and indicate the operation context. After the reading or writing operation completes, the EFI MTFTPv4 Protocol driver updates the Status parameter and the Event is signaled if it is not NULL. The following table lists the status codes that are returned in the Status parameter.

Status Codes Returned

EFI_SUCCESS	The data file has been transferred successfully.
EFI_OUT_OF_RESOURCES	Required system resources could not be allocated.
EFI_BUFFER_TOO_SMALL	BufferSize is not large enough to hold the downloaded data in downloading process.
EFI_ABORTED	Current operation is aborted by user.
EFI_NETWORK_UNREACHABLE	An ICMP network unreachable error packet was received.
EFI_NETWORK_UNREACHABLE	AnICMP host unreachable error packet was received.
EFI_NETWORK_UNREACHABLE	An ICMP protocol unreachable error packet was received.
EFI_NETWORK_UNREACHABLE	An ICMP port unreachable error packet was received .
EFI_ICMP_ERROR	Some other ICMP ERROR packet was received.
EFI_TIMEOUT	No responses were received from the MTFTPv4 server.
EFI_TFTP_ERROR	An MTFTPv4 ERROR packet was received.
EFI_DEVICE_ERROR	An unexpected network error or system error occurred.
EFI_NO_MEDIA	There was a media error.

//*******************************************************
// EFI_MTFTP4_CHECK_PACKET
//*******************************************************
typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP4_CHECK_PACKET)(
  IN EFI_MTFTP4_PROTOCOL       *This,
  IN EFI_MTFTP4_TOKEN          *Token,
  IN UINT16                    PacketLen,
  IN EFI_MTFTP4_PACKET         *Packet
  );

This: Pointer to the EFI_MTFTP4_PROTOCOL instance.
Token: The token that the caller provided in the EFI_MTFTP4_PROTOCOL .ReadFile(), WriteFile() or ReadDirectory() function. Type EFI_MTFTP4_TOKEN is defined in EFI_MTFTP4_PROTOCOL.ReadFile().
PacketLen: Indicates the length of the packet.
Packet: Pointer to an MTFTPv4 packet. Type EFI_MTFTP4_PACKET is defined in EFI_MTFTP4_PROTOCOL .GetInfo().

EFI_MTFTP4_CHECK_PACKET is a callback function that is provided by the caller to intercept the
EFI_MTFTP4_OPCODE_DATA or EFI_MTFTP4_OPCODE_DATA8 packets processed in the
EFI_MTFTP4_PROTOCOL .ReadFile() function, and alternatively to intercept
EFI_MTFTP4_OPCODE_OACK or EFI_MTFTP4_OPCODE_ERROR packets during a call to EFI_MTFTP4_PROTOCOL.ReadFile(), WriteFile() or ReadDirectory(). Whenever an MTFTPv4 packet with the type described above is received from a server, the EFI MTFTPv4 Protocol driver will call
EFI_MTFTP4_CHECK_PACKET function to let the caller have an opportunity to process this packet. Any status code other than EFI_SUCCESS that is returned from this function will abort the transfer process.

//*****************************************************
// EFI_MTFTP4_TIMEOUT_CALLBACK
//*****************************************************
typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP4_TIMEOUT_CALLBACK)(
  IN EFI_MTFTP4_PROTOCOL         *This,
  IN EFI_MTFTP4_TOKEN            *Token
  );

This: Pointer to the EFI_MTFTP4_PROTOCOL instance.
Token: The token that is provided in the EFI_MTFTP4_PROTOCOL .ReadFile() or EFI_MTFTP4_PROTOCOL.WriteFile() or EFI_MTFTP4_PROTOCOL.ReadDirectory() functions by the caller. Type EFI_MTFTP4_TOKEN is defined in EFI_MTFTP4_PROTOCOL.ReadFile().

EFI_MTFTP4_TIMEOUT_CALLBACK is a callback function that the caller provides to capture the timeout event in the EFI_MTFTP4_PROTOCOL .ReadFile(), EFI_MTFTP4_PROTOCOL.WriteFile() or EFI_MTFTP4_PROTOCOL.ReadDirectory() functions. Whenever a timeout occurs, the EFI MTFTPv4 Protocol driver will call the EFI_MTFTP4_TIMEOUT_CALLBACK function to notify the caller of the timeout event. Any status code other than EFI_SUCCESS that is returned from this function will abort the current download process.

//*****************************************************
// EFI_MTFTP4_PACKET_NEEDED
//*****************************************************
typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP4_PACKET_NEEDED)(
  IN EFI_MTFTP4_PROTOCOL         *This,
  IN EFI_MTFTP4_TOKEN            *Token,
  IN OUT UINT16                  *Length,
  OUT VOID                       **Buffer
  );

This: Pointer to the EFI_MTFTP4_PROTOCOL instance.
Token: The token provided in the EFI_MTFTP4_PROTOCOL .WriteFile() by the caller.
Length: Indicates the length of the raw data wanted on input, and the length the data available on output.
Buffer: Pointer to the buffer where the data is stored.

EFI_MTFTP4_PACKET_NEEDED is a callback function that the caller provides to feed data to the EFI_MTFTP4_PROTOCOL .WriteFile() function. EFI_MTFTP4_PACKET_NEEDED provides another mechanism for the caller to provide data to upload other than a static buffer. The EFI MTFTP4 Protocol driver always calls EFI_MTFTP4_PACKET_NEEDED to get packet data from the caller if no static buffer was given in the initial call to EFI_MTFTP4_PROTOCOL.WriteFile() function. Setting **Length* to zero signals the end of the session. Returning a status code other than EFI_SUCCESS aborts the session.

Status Codes Returned

EFI_SUCCESS	The data file is being downloaded.
EFI_INVALID_PARAMETER	One or more of the parameters is not valid. • This is NULL. • Token is NULL. • Token.Filename is NULL. • Token.OptionCount is not zero and Token.OptionList is NULL. • One or more options in Token.OptionList have wrong format. • Token.Buffer and Token.CheckPacket are both NULL. • One or more IPv4 addresses in Token.OverrideData are not valid unicast IPv4 addresses if Token.OverrideData is not NULL and the addresses are not set to all zero.
EFI_UNSUPPORTED	• One or more options in the Token.OptionList are in the unsupported list of structure EFI_MTFTP4_MODE_DATA.
EFI_NOT_STARTED	The EFI MTFTPv4 Protocol driver has not been started.
EFI_NO_MAPPING	When using a default address, configuration (DHCP, BOOTP, RARP, etc.) is not finished yet.
EFI_ALREADY_STARTED	This Token is being used in another MTFTPv4 session.
EFI_ACCESS_DENIED	The previous operation has not completed yet.
EFI_OUT_OF_RESOURCES	Required system resources could not be allocated.
EFI_DEVICE_ERROR	An unexpected network error or system error occurred.
EFI_NO_MEDIA	There was a media error.

30.3.8. EFI_MTFTP4_PROTOCOL.WriteFile()

Summary

Sends a data file to an MTFTPv4 server. May be unsupported in some EFI implementations.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP4_WRITE_FILE)(
  IN EFI_MTFTP4_PROTOCOL       *This,
  IN EFI_MTFTP4_TOKEN          *Token
  );

Parameters

This: Pointer to the EFI_MTFTP4_PROTOCOL instance.
Token: Pointer to the token structure to provide the parameters that are used in this function. Type EFI_MTFTP4_TOKEN is defined in EFI_MTFTP4_PROTOCOL .ReadFile().

Description

The WriteFile() function is used to initialize an uploading operation with the given option list and optionally wait for completion. If one or more of the options is not supported by the server, the unsupported options are ignored and a standard TFTP process starts instead. When the upload process completes, whether successfully or not, Token.Event is signaled, and the EFI MTFTPv4 Protocol driver updates Token.Status.

The caller can supply the data to be uploaded in the following two modes:

Through the user-provided buffer
Through a callback function

With the user-provided buffer, the Token.BufferSize field indicates the length of the buffer, and the driver will upload the data in the buffer. With an EFI_MTFTP4_PACKET_NEEDED callback function, the driver will call this callback function to get more data from the user to upload. See the definition of EFI_MTFTP4_PACKET_NEEDED for more information. These two modes cannot be used at the same time. The callback function will be ignored if the user provides the buffer.

Status Codes Returned

EFI_SUCCESS	The upload session has started.
EFI_UNSUPPORTED	The operation is not supported by this implementation.
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE: • This is NULL. • Token is NULL. • Token.Filename is NULL. • Token.OptionCount is not zero and Token.OptionList is NULL. • One or more options in Token.OptionList have wrong format. • Token.Buffer and Token.PacketNeeded are both NULL. • One or more IPv4 addresses in Token.OverrideData are not valid unicast IPv4 addresses if Token.OverrideData is not NULL and the addresses are not set to all zero.
EFI_UNSUPPORTED	• One or more options in the Token.OptionList are in the unsupported list of structure EFI_MTFTP4_MODE_DATA.
EFI_NOT_STARTED	The EFI MTFTPv4 Protocol driver has not been started.
EFI_NO_MAPPING	When using a default address, configuration (DHCP, BOOTP, RARP, etc.) is not finished yet.
EFI_ALREADY_STARTED	This Token is already being used in another MTFTPv4 session.
EFI_OUT_OF_RESOURCES	Required system resources could not be allocated.
EFI_ACCESS_DENIED	The previous operation has not completed yet.
EFI_DEVICE_ERROR	An unexpected network error or system error occurred.
EFI_NO_MEDIA	There was a media error.

30.3.9. EFI_MTFTP4_PROTOCOL.ReadDirectory()

Summary

Downloads a data file “directory” from an MTFTPv4 server. May be unsupported in some EFI implementations.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP4_READ_DIRECTORY)(
  IN EFI_MTFTP4_PROTOCOL       *This,
  IN EFI_MTFTP4_TOKEN          *Token
  );

Parameters

This: Pointer to the EFI_MTFTP4_PROTOCOL instance.
Token: Pointer to the token structure to provide the parameters that are used in this function. Type EFI_MTFTP4_TOKEN is defined in EFI_MTFTP4_PROTOCOL .ReadFile().

Description

The ReadDirectory() function is used to return a list of files on the MTFTPv4 server that are logically (or operationally) related to Token.Filename. The directory request packet that is sent to the server is built with the option list that was provided by caller, if present.

The file information that the server returns is put into either of the following locations:

A fixed buffer that is pointed to by Token.Buffer
A download service function that is pointed to by Token.CheckPacket

If both Token.Buffer and Token.CheckPacket are used, then Token.CheckPacket will be called first. If the call is successful, the packet will be stored in Token.Buffer.

The returned directory listing in the Token.Buffer or EFI_MTFTP4_PACKET consists of a list of two or three variable-length ASCII strings, each terminated by a null character, for each file in the directory. If the multicast option is involved, the first field of each directory entry is the static multicast IP address and UDP port number that is associated with the file name. The format of the field is ip:ip:ip:ip:port. If the multicast option is not involved, this field and its terminating null character are not present.

The next field of each directory entry is the file name and the last field is the file information string. The information string contains the file size and the create/modify timestamp. The format of the information string is filesize yyyy-mm-dd hh:mm:ss:ffff. The timestamp is Coordinated Universal Time (UTC; also known as Greenwich Mean Time [GMT]).

Status Codes Returned

EFI_SUCCESS	The MTFTPv4 related file “directory” has been downloaded.
EFI_UNSUPPORTED	The EFI MTFTPv4 Protocol driver does not support this function.
EFI_INVALID_PARAMETER	One or more of these conditions is TRUE: • This is NULL. • Token is NULL. • Token.Filename is NULL. • Token.OptionCount is not zero and Token.OptionList is NULL. • One or more options in Token.OptionList have wrong format. Token.Buffer and Token.CheckPacket are both *NULL. • One or more IPv4 addresses in Token.OverrideData are not valid unicast IPv4 addresses if Token.OverrideData is not NULL and the addresses are not set to all zero.
EFI_UNSUPPORTED	One or more options in the Token.OptionList are in the unsupported list of structure EFI_MTFTP4_MODE_DATA.
EFI_NOT_STARTED	The EFI MTFTPv4 Protocol driver has not been started.
EFI_NO_MAPPING	When using a default address, configuration (DHCP, BOOTP, RARP, etc.) is not finished yet.
EFI_ALREADY_STARTED	This Token is already being used in another MTFTPv4 session.
EFI_OUT_OF_RESOURCES	Required system resources could not be allocated.
EFI_ACCESS_DENIED	The previous operation has not completed yet.
EFI_DEVICE_ERROR	An unexpected network error or system error occurred.
EFI_NO_MEDIA	There was a media error.

30.3.10. EFI_MTFTP4_PROTOCOL.POLL()

Summary

Polls for incoming data packets and processes outgoing data packets.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP4_POLL) (
  IN EFI_MTFTP4_PROTOCOL     *This
  );

Parameters

This: Pointer to the EFI_MTFTP4_PROTOCOL instance.

Description

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.

Status Codes Returned

EFI_SUCCESS	Incoming or outgoing data was processed.
EFI_NOT_STARTED	This EFI MTFTPv4 Protocol instance has not been started.
EFI_NO_MAPPING	When using a default address, configuration (DHCP, BOOTP, RARP, etc.) is not finished yet.
EFI_INVALID_PARAMETER	This is NULL.
EFI_DEVICE_ERROR	An unexpected system or network error occurred.
EFI_TIMEOUT	Data was dropped out of the transmit and/or receive queue. Consider increasing the polling rate.

30.4. EFI MTFTPv6 Protocol

This section defines the EFI MTFTPv6 Protocol interface that is built upon the EFI UDPv6 Protocol.

30.4.1. MTFTP6 Service Binding Protocol

30.4.1.1. EFI_MTFTP6_SERVICE_BINDING_PROTOCOL

Summary

The EFI MTFTPv6 Service Binding Protocol is used to locate communication devices that are supported by an EFI MTFTPv6 Protocol driver and to create and destroy instances of the EFI MTFTPv6 Protocol child instance that can use the underlying communications device.

GUID

#define EFI_MTFTP6_SERVICE_BINDING_PROTOCOL_GUID \
  {0xd9760ff3,0x3cca,0x4267,\
    {0x80,0xf9,0x75,0x27,0xfa,0xfa,0x42,0x23}}

Description

A network application or driver that requires MTFTPv6 I/O services can use one of the protocol handler services, such as BS->LocateHandleBuffer(), to search for devices that publish an EFI MTFTPv6 Service Binding Protocol GUID. Each device with a published EFI MTFTPv6 Service Binding Protocol GUID supports the EFI MTFTPv6 Protocol service and may be available for use.

After a successful call to the EFI_MTFTP6_SERVICE_BINDING_PROTOCOL.CreateChild() function, the newly created child EFI MTFTPv6 Protocol driver instance is in the un-configured state; it is not ready to transfer data.

Before a network application terminates execution, every successful call to the EFI_MTFTP6_SERVICE_BINDING_PROTOCOL.CreateChild() function must be matched with a call to the EFI_MTFTP6_SERVICE_BINDING_PROTOCOL.DestroyChild() function.

Each instance of the EFI MTFTPv6 Protocol driver can support one file transfer operation at a time. To download two files at the same time, two instances of the EFI MTFTPv6 Protocol driver need to be created.

30.4.2. MTFTP6 Protocol

30.4.2.1. EFI_MTFTP6_PROTOCOL

Summary

The EFI MTFTPv6 Protocol provides basic services for client-side unicast and/or multicast TFTP operations.

GUID

#define EFI_MTFTP6_PROTOCOL_GUID \
  {0xbf0a78ba,0xec29,0x49cf,\
    0xa1,0xc9,0x7a,0xe5,0x4e,0xab,0x6a,0x51}}

Protocol Interface Structure

typedef struct _EFI_MTFTP6_PROTOCOL {
  EFI_MTFTP6_GET_MODE_DATA   GetModeData;
  EFI_MTFTP6_CONFIGURE       Configure;
  EFI_MTFTP6_GET_INFO        GetInfo;
  EFI_MTFTP6_PARSE_OPTIONS   ;
  EFI_MTFTP6_READ_FILE       ReadFile;
  EFI_MTFTP6_WRITE_FILE      WriteFile;
  EFI_MTFTP6_READ_DIRECTORY  ReadDirectory;
  EFI_MTFTP6_POLL            Poll;
}  EFI_MTFTP6_PROTOCOL;

Parameters

GetModeData: Reads the current operational settings. See the GetModeData() function description.
Configure: Initializes, changes, or resets the operational settings for this instance of the EFI MTFTPv6 Protocol driver. See the Configure() function description.
GetInfo: Retrieves information about a file from an MTFTPv6 server. See the GetInfo() function description. Parses the options in an MTFTPv6 OACK (options acknowledgement) packet. See the () function description.
ReadFile: Downloads a file from an MTFTPv6 server. See the ReadFile() function description.
WriteFile: Uploads a file to an MTFTPv6 server. This function may be unsupported in some EFI implementations. See the WriteFile() function description.
ReadDirectory: Downloads a related file directory from an MTFTPv6 server. This function may be unsupported in some EFI implementations. See the ReadDirectory() function description.
Poll: Polls for incoming data packets and processes outgoing data packets. See the Poll() function description.

Description

The EFI_MTFTP6_PROTOCOL is designed to be used by UEFI drivers and applications to transmit and receive data files. The EFI MTFTPv6 Protocol driver uses the underlying EFI UDPv6 Protocol driver and EFI IPv6 Protocol driver.

30.4.2.2. EFI_MTFTP6_PROTOCOL.GetModeData()

Summary

Read the current operational settings.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP6_GET_MODE_DATA)(
 IN EFI_MTFTP6_PROTOCOL          *This,
   OUT EFI_MTFTP6_MODE_DATA      *ModeData
 );

Parameters

This: Pointer to the EFI_MTFTP6_PROTOCOL instance.
ModeData: The buffer in which the EFI MTFTPv6 Protocol driver mode data is returned. Type EFI_MTFTP6_MODE_DATA is defined in “Related Definitions” below.

Description

The GetModeData () function reads the current operational settings of this EFI MTFTPv6 Protocol driver instance.

Related Definitions

//*****************************************************
// EFI_MTFTP6_MODE_DATA
//*****************************************************
typedef struct {
  EFI_MTFTP6_CONFIG_DATA     ConfigData;
  UINT8                      SupportedOptionCount;
  UINT8                      **SupportedOptions;
}  EFI_MTFTP6_MODE_DATA;

ConfigData: The configuration data of this instance. Type EFI_MTFTP6_CONFIG_DATA is defined below.
SupportedOptionCount: The number of option strings in the following SupportedOptions array.
SupportedOptions: An array of null-terminated ASCII option strings that are recognized and supported by this EFI MTFTPv6 Protocol driver implementation. The buffer is read only to the caller and the caller should NOT free the buffer.

The EFI_MTFTP6_MODE_DATA structure describes the operational state of this instance.

//*****************************************************
// EFI_MTFTP6_CONFIG_DATA
//*****************************************************
typedef struct {
  EFI_IPv6_ADDRESS     StationIp;
  UINT16               LocalPort;
  EFI_IPv6_ADDRESS     ServerIp;
  UINT16               InitialServerPort;
  UINT16               TryCount;
  UINT16               TimeoutValue;
}  EFI_MTFTP6_CONFIG_DATA;

StationIp: The local IP address to use. Set to zero to let the underlying IPv6 driver choose a source address. If not zero it must be one of the configured IP addresses in the underlying IPv6 driver.
LocalPort: Local port number. Set to zero to use the automatically assigned port number.
ServerIp: The IP address of the MTFTPv6 server.
InitialServerPort: The initial MTFTPv6 server port number. Request packets are sent to this port. This number is almost always 69 and using zero defaults to 69.
TryCount: The number of times to transmit MTFTPv6 request packets and wait for a response.
TimeoutValue: The number of seconds to wait for a response after sending the MTFTPv6 request packet.

The EFI_MTFTP6_CONFIG_DATA structure is used to retrieve and change MTFTPv6 session parameters.

Status Codes Returned

EFI_SUCCESS	The configuration data was successfully returned.
EFI_OUT_OF_RESOURCES	The required mode data could not be allocated.
EFI_INVALID_PARAMETER	This is NULL or ModeData is NULL.

30.4.2.3. EFI_MTFTP6_PROTOCOL.Configure()

Summary

Initializes, changes, or resets the default operational setting for this EFI MTFTPv6 Protocol driver instance.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP6_CONFIGURE)(
  IN EFI_MTFTP6_PROTOCOL       *This,
  IN EFI_MTFTP6_CONFIG_DATA    *MtftpConfigData OPTIONAL
  );

Parameters

This: Pointer to the EFI_MTFTP6_PROTOCOL instance.
MtftpConfigData: Pointer to the configuration data structure. Type EFI_MTFTP6_CONFIG_DATA is defined in EFI_MTFTP6_PROTOCOL.GetModeData().

Description

The Configure () function is used to set and change the configuration data for this EFI MTFTPv6 Protocol driver instance. The configuration data can be reset to startup defaults by calling Configure () with MtftpConfigData set to NULL. Whenever the instance is reset, any pending operation is aborted. By changing the EFI MTFTPv6 Protocol driver instance configuration data, the client can connect to different MTFTPv6 servers. The configuration parameters in MtftpConfigData are used as the default parameters in later MTFTPv6 operations and can be overridden in later operations.

Status Codes Returned

EFI_SUCCESS	The EFI MTFTPv6 Protocol instance was configured successfully.
EFI_INVALID_PARAMETER	One or more following conditions are TRUE: • This is NULL. • MtftpConfigData.StationIp is neither zero nor one of the configured IP addresses in the underlying IPv6 driver. • MtftpCofigData.ServerIp is not a valid IPv6 unicast address.
EFI_ACCESS_DENIED	• The configuration could not be changed at this time because there is some MTFTP background operation in progress. • MtftpCofigData.LocalPort is already in use.
EFI_NO_MAPPING	The underlying IPv6 driver was responsible for choosing a source address for this instance, but no source address was available for use.
EFI_OUT_OF_RESOURCES	The EFI MTFTPv6 Protocol driver instance data could not be allocated.
EFI_DEVICE_ERROR	An unexpected system or network error occurred. The EFI MTFTPv6 Protocol driver instance is not configured.

30.4.2.4. EFI_MTFTP6_PROTOCOL.GetInfo()

Summary

Get information about a file from an MTFTPv6 server.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP6_GET_INFO)(
  IN EFI_MTFTP6_PROTOCOL       *This,
  IN EFI_MTFTP6_OVERRIDE_DATA  *OverrideData OPTIONAL,
  IN UINT8                     *Filename,
  IN UINT8                     *ModeStr OPTIONAL,
  IN UINT8                     OptionCount,
  IN EFI_MTFTP6_OPTION         *OptionList OPTIONAL,
  OUT UINT32                   *PacketLength,
  OUT EFI_MTFTP6_PACKET        **Packet OPTIONAL
  );

Parameters

This: Pointer to the EFI_MTFTP6_PROTOCOL instance.
OverrideData: Data that is used to override the existing parameters. If NULL, the default parameters that were set in the EFI_MTFTP6_PROTOCOL. Configure () function are used. Type EFI_MTFTP6_OVERRIDE_DATA is defined in “Related Definitions” below.
Filename: Pointer to an null-terminated ASCII file name string.
ModeStr: Pointer to an null-terminated ASCII mode string. If NULL, octet will be used.
OptionCount: Number of option/value string pairs in OptionList .
OptionList: Pointer to array of option/value string pairs. Ignored if OptionCount is zero. Type EFI_MTFTP6_OPTION is defined in “Related Definitions” below.
PacketLength: The number of bytes in the returned packet.
Packet: The pointer to the received packet. This buffer must be freed by the caller. Type EFI_MTFTP6_PACKET is defined in “Related Definitions” below.

Description

The GetInfo() function assembles an MTFTPv6 request packet with options, sends it to the MTFTPv6 server, and may return an MTFTPv6 OACK, MTFTPv6 ERROR, or ICMP ERROR packet. Retries occur only if no response packets are received from the MTFTPv6 server before the timeout expires.

Related Definitions

//*************************************************
// EFI_MTFTP_OVERRIDE_DATA
//*************************************************
typedef struct {
  EFI_IPv6_ADDRESS       ServerIp;
  UINT16                 ServerPort;
  UINT16                 TryCount;
  UINT16                 TimeoutValue;
}  EFI_MTFTP6_OVERRIDE_DATA;

ServerIp: IP address of the MTFTPv6 server. If set to all zero, the value that was set by the EFI_MTFTP6_PROTOCOL.Configure() function will be used.
ServerPort: MTFTPv6 server port number. If set to zero, it will use the value that was set by the EFI_MTFTP6_PROTOCOL.Configure() function.
TryCount: Number of times to transmit MTFTPv6 request packets and wait for a response. If set to zero, the value that was set by the EFI_MTFTP6_PROTOCOL.Configure() function will be used.
TimeoutValue: Number of seconds to wait for a response after sending the MTFTPv6 request packet. If set to zero, the value that was set by the EFI_MTFTP6_PROTOCOL.Configure() function will be used.

The EFI_MTFTP6_OVERRIDE_DATA structure is used to override the existing parameters that were set by the EFI_MTFTP6_PROTOCOL.Configure() function.

//*************************************************
// EFI_MTFTP6_OPTION
//*************************************************
typedef struct {
  UINT8           *OptionStr;
  UINT8           *ValueStr;
}   EFI_MTFTP6_OPTION;

OptionStr: Pointer to the null-terminated ASCII MTFTPv6 option string.
ValueStr: Pointer to the null-terminated ASCII MTFTPv6 value string.

#pragma pack(1)

//********************************************
// EFI_MTFTP6_PACKET
//********************************************
typedef union {
  UINT16                   OpCode;
  EFI_MTFTP6_REQ_HEADER    Rrq;
  EFI_MTFTP6_REQ_HEADER    Wrq;
  EFI_MTFTP6_OACK_HEADER   Oack;
  EFI_MTFTP6_DATA_HEADER   Data;
  EFI_MTFTP6_ACK_HEADER    Ack;
// This field should be ignored and treated as reserved.
  EFI_MTFTP6_DATA8_HEADER  Data8;
// This field should be ignored and treated as reserved.
  EFI_MTFTP6_ACK8_HEADER   Ack8;
EFI_MTFTP6_ERROR_HEADER    Error;
}  EFI_MTFTP6_PACKET;

//*********************************************
// EFI_MTFTP6_REQ_HEADER
//*********************************************
typedef struct {
  UINT16         OpCode;
  UINT8          Filename[1];
}  EFI_MTFTP6_REQ_HEADER;

//*********************************************
// EFI_MTFTP6_OACK_HEADER
//*********************************************
typedef struct {
  UINT16         OpCode;
  UINT8          Data[1];
}  EFI_MTFTP6_OACK_HEADER;

//*********************************************
// EFI_MTFTP6_DATA_HEADER
//*********************************************
typedef struct {
  UINT16         OpCode;
  UINT16         Block;
  UINT8          Data[1];
}  EFI_MTFTP6_DATA_HEADER;

//*********************************************
// EFI_MTFTP6_ACK_HEADER
//*********************************************
typedef struct {
  UINT16         OpCode;
  UINT16         Block[1];
}  EFI_MTFTP6_ACK_HEADER;

//*********************************************
// EFI_MTFTP6_DATA8_HEADER
// This field should be ignored and treated as reserved.
//*********************************************
typedef struct {
  UINT16         OpCode;
  UINT64         Block;
  UINT8          Data[1];
}  EFI_MTFTP6_DATA8_HEADER;

//*********************************************
// EFI_MTFTP6_ACK8_HEADER
//*********************************************
typedef struct {
  UINT16         OpCode;
  UINT64         Block[1];
}  EFI_MTFTP6_ACK8_HEADER;

//*********************************************
// EFI_MTFTP6_ERROR_HEADER
//*********************************************
typedef struct {
  UINT16         OpCode;
  UINT16         ErrorCode;
  UINT8          ErrorMessage[1];
}  EFI_MTFTP6_ERROR_HEADER;

#pragma pack()

Table 1 below describes the parameters that are listed in the MTFTPv6 packet structure definitions above. All the above structures are byte packed. The pragmas may vary from compiler to compiler. The MTFTPv6 packet structures are also used by the following functions:

EFI_MTFTP6_PROTOCOL.ReadFile()
EFI_MTFTP6_PROTOCOL.WriteFile()
EFI_MTFTP6_PROTOCOL.ReadDirectory()
The EFI MTFTPv6 Protocol packet check callback functions

NOTE: BYTE ORDER: Both incoming and outgoing MTFTPv6 packets are in network byte order. All other parameters defined in functions or data structures are stored in host byte order.

Table 30.2 Descriptions of Parameters in MTFTPv6 PacketStructures
Data Structure	Parameter	Description
EFI_MTFTP6_PACKET	OpCode	Type of packets as defined by the MTFTPv6 packet opcodes. Opcode values are defined below.
	Rrq, Wrq	Read request or write request packet header. See the description for EFI_MTFTP6_REQ_HEADER below in this table.
	Oack	Option acknowledge packet header. See the description for EFI_MTFTP6_OACK_HEADER below in this table.
	Data	Data packet header. See the description for EFI_MTFTP6_DATA_HEADER below in this table.
	Ack	Acknowledgement packet header. See the description for EFI_MTFTP6_ACK_HEADER below in this table.
	Data8	This field should be ignored and treated as reserved. Data packet header with big block number. See the description for EFI_MTFTP6_DATA8_HEADER below in this table.
	Ack8	This field should be ignored and treated as reserved. Acknowledgement header with big block number. See the description for EFI_MTFTP6_ACK8_HEADER below in this table.
	Error	Error packet header. See the description for EFI_MTFTP6_ERROR_HEADER below in this table.
EFI_MTFTP6_REQ_HEADER	OpCode	For this packet type, OpCode = EFI_MTFTP6_OPCODE_RRQ for a read request or OpCode = EFI_MTFTP6_OPCODE_WRQ for a write request.
	Filename	The file name to be downloaded or uploaded.
EFI_MTFTP6_OACK_HEADER	OpCode	For this packet type OpCode = EFI_MTFTP6_OPCODE_OACK.
	Data	The option strings in the option acknowledgement packet.
EFI_MTFTP6_DATA_HEADER	OpCode	For this packet type OpCode = EFI_MTFTP6_OPCODE_DATA.
	Block	Block number of this data packet.
	Data	The content of this data packet.
EFI_MTFTP6_ACK_HEADER	OpCode	For this packet type OpCode = EFI_MTFTP6_OPCODE_ACK.
	Block	The block number of the data packet that is being acknowledged.
EFI_MTFTP6_DATA8_HEADER	OpCode	This field should be ignored and treated as reserved. For this packet type, OpCode = EFI_MTFTP6_OPCODE_DATA8.
	Block	This field should be ignored and treated as reserved. The block number of data packet.
	Data	This field should be ignored and treated as reserved. The content of this data packet.
EFI_MTFTP6_ACK8_HEADER	OpCode	For this packet type OpCode = EFI_MTFTP6_OPCODE_ACK8.
	Block	The block number of the data packet that is being
EFI_MTFTP6_ERROR_HEADER	OpCode	For this packet type OpCode = EFI_MTFTP6_OPCODE_ERROR.
	ErrorCode	The error number as defined by the MTFTPv6 packet error codes. Values for ErrorCode are defined below.
	ErrorMessage	Error message string.

//
// MTFTP Packet OpCodes
//
#define EFI_MTFTP6_OPCODE_RRQ    1
#define EFI_MTFTP6_OPCODE_WRQ    2
#define EFI_MTFTP6_OPCODE_DATA   3
#define EFI_MTFTP6_OPCODE_ACK    6
#define EFI_MTFTP6_OPCODE_ERROR  5
#define EFI_MTFTP6_OPCODE_OACK   6
#define EFI_MTFTP6_OPCODE_DIR    7
//This field should be ignored and treated as reserved.
#define EFI_MTFTP4_OPCODE_DATA8  8
//This field should be ignored and treated as reserved.
#define EFI_MTFTP4_OPCODE_ACK8   9

Following is a description of the fields in the above definition.

Table 30.3 MTFTP Packet OpCode Descriptions
MTFTP Packet OpCode	Description
EFI_MTFTP6_OPCODE_RRQ	The MTFTPv6 packet is a read request.
EFI_MTFTP6_OPCODE_WRQ	The MTFTPv6 packet is a write request.
EFI_MTFTP6_OPCODE_DATA	The MTFTPv6 packet is a data packet.
EFI_MTFTP6_OPCODE_ACK	The MTFTPv6 packet is an acknowledgement packet.
EFI_MTFTP6_OPCODE_ERROR	The MTFTPv6 packet is an error packet.
EFI_MTFTP6_OPCODE_OACK	The MTFTPv6 packet is an option acknowledgement packet.
EFI_MTFTP6_OPCODE_DIR	The MTFTPv6 packet is a directory query packet.
EFI_MTFTP6_OPCODE_DATA8	This field should be ignored and treated as reserved. The MTFTPv6 packet is a data packet with a big block number.
EFI_MTFTP6_OPCODE_ACK8	This field should be ignored and treated as reserved. The MTFTPv6 packet is an acknowledgement packet with a big block number.

//
// MTFTP ERROR Packet ErrorCodes
//
#define EFI_MTFTP6_ERRORCODE_NOT_DEFINED         0
#define EFI_MTFTP6_ERRORCODE_FILE_NOT_FOUND      1
#define EFI_MTFTP6_ERRORCODE_ACCESS_VIOLATION    2
#define EFI_MTFTP6_ERRORCODE_DISK_FULL           3
#define EFI_MTFTP6_ERRORCODE_ILLEGAL_OPERATION   4
#define EFI_MTFTP6_ERRORCODE_UNKNOWN_TRANSFER_ID 5
#define EFI_MTFTP6_ERRORCODE_FILE_ALREADY_EXISTS 6
#define EFI_MTFTP6_ERRORCODE_NO_SUCH_USER        7
#define EFI_MTFTP6_ERRORCODE_REQUEST_DENIED      8

Table 30.4 MTFTP ERROR Packet ErrorCode Descriptions
MTFTP ERROR Packet ErrorCodes	Description
E FI_MTFTP6_ERRORCODE_NOT_DEFINED	The error code is not defined. See the error message in the packet (if any) for details.
EFI_ MTFTP6_ERRORCODE_FILE_NOT_FOUND	The file was not found.
EFI_MT FTP6_ERRORCODE_ACCESS_VIOLATION	There was an access violation.
EFI_MTFTP6_ERRORCODE_DISK_FULL	The disk was full or its allocation was exceeded.
EFI_MTF TP6_ERRORCODE_ILLEGAL_OPERATION	The MTFTPv6 operation was illegal.
EFI_MTFTP 6_ERRORCODE_UNKNOWN_TRANSFER_ID	The transfer ID is unknown.
EFI_MTFTP 6_ERRORCODE_FILE_ALREADY_EXISTS	The file already exists.
EF I_MTFTP6_ERRORCODE_NO_SUCH_USER	There is no such user.
EFI_ MTFTP6_ERRORCODE_REQUEST_DENIED	The request has been denied due to option negotiation.

Status Codes Returned

EFI_SUCCESS	An MTFTPv6 OACK packet was received and is in the Packet.
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE: • This is NULL. • Filename is NULL. • OptionCount is not zero and OptionList is NULL. • One or more options in OptionList have wrong format. • PacketLength is NULL. • OverrideData.ServerIp is not a valid unicast IPv6 address and not set to all zero.
EFI_UNSUPPORTED	One or more options in the OptionList are unsupported by this implementation.
EFI_NOT_STARTED	The EFI MTFTPv6 Protocol driver has not been started.
EFI_NO_MAPPING	The underlying IPv6 driver was responsible for choosing a source address for this instance, but no source address was available for use.
EFI_ACCESS_DENIED	The previous operation has not completed yet.
EFI_OUT_OF_RESOURCES	Required system resources could not be allocated.
EFI_TFTP_ERROR	An MTFTPv6 ERROR packet was received and is in the Packet.
EFI_NETWORK_UNREACHABLE	An ICMP network unreachable error packet was received and the Packet is set to NULL.
EFI_NETWORK_UNREACHABLE	An ICMP host unreachable error packet was received and the Packet is set to NULL.
EFI_NETWORK_UNREACHABLE	An ICMP protocol unreachable error packet was received and the Packet is set to NULL.
EFI_NETWORK_UNREACHABLE	An ICMP port unreachable error packet was received and the Packet is set to NULL.
EFI_ICMP_ERROR	Some other ICMP ERROR packet was received and the Packet is set to NULL.
EFI_PROTOCOL_ERROR	An unexpected MTFTPv6 packet was received and is in the Packet.
EFI_TIMEOUT	No responses were received from the MTFTPv6 server.
EFI_DEVICE_ERROR	An unexpected network error or system error occurred.

30.4.2.5. EFI_MTFTP6_PROTOCOL.ParseOptions()

Summary

Parse the options in an MTFTPv6 OACK packet.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP6_PARSE_OPTIONS)(
  IN EFI_MTFTP6_PROTOCOL           *This,
  IN UINT32                        PacketLen,
  IN EFI_MTFTP6_PACKET             *Packet,
  OUT UINT32                       *OptionCount,
  OUT EFI_MTFTP6_OPTION            **OptionList OPTIONAL
  );

Parameters

This: Pointer to the EFI_MTFTP6_PROTOCOL instance.
PacketLen: Length of the OACK packet to be parsed.
Packet: Pointer to the OACK packet to be parsed. Type EFI_MTFTP6_PACKET is defined in EFI_MTFTP6_PROTOCOl.GetInfo() .
OptionCount: Pointer to the number of options in the following OptionList.
OptionList: Pointer to EFI_MTFTP6_OPTION storage. Each pointer in the OptionList points to the corresponding MTFTP option buffer in the Packet. Call the EFI Boot Service FreePool() to release the OptionList if the options in this OptionList are not needed any more. Type EFI_MTFTP6_OPTION is defined in EFI_MTFTP6_PROTOCOL.GetInfo().

Description

The ParseOptions() function parses the option fields in an MTFTPv6 OACK packet and returns the number of options that were found and optionally a list of pointers to the options in the packet.

If one or more of the option fields are not valid, then EFI_PROTOCOL_ERROR is returned and * OptionCount and * OptionList stop at the last valid option.

Status Codes Returned

EFI_SUCCESS	The OACK packet was valid and the OptionCount and OptionList parameters have been updated.
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE: • PacketLen is 0. • Packet is NULL or Packet is not a valid MTFTPv6 packet. • OptionCount is NULL.
EFI_NOT_FOUND	No options were found in the OACK packet.
EFI_OUT_OF_RESOURCES	Storage for the OptionList array can not be allocated.
EFI_PROTOCOL_ERROR	One or more of the option fields is invalid.

30.4.2.6. EFI_MTFTP6_PROTOCOL.ReadFile()

Summary

Download a file from an MTFTPv6 server.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP6_READ_FILE)(
  IN EFI_MTFTP6_PROTOCOL       *This,
  IN EFI_MTFTP6_TOKEN          *Token
  );

Parameters

This: Pointer to the EFI_MTFTP6_PROTOCOL instance.
Token: Pointer to the token structure to provide the parameters that are used in this operation. Type EFI_MTFTP6_TOKEN is defined in “Related Definitions” below.

Description

The ReadFile() function is used to initialize and start an MTFTPv6 download process and optionally wait for completion. When the download operation completes, whether successfully or not, the Token.Status field is updated by the EFI MTFTPv6 Protocol driver and then Token.Event is signaled if it is not NULL.

Data can be downloaded from the MTFTPv6 server into either of the following locations:

A fixed buffer that is pointed to by Token.Buffer
A download service function that is pointed to by Token.CheckPacket

If both Token.Buffer and Token.CheckPacket are used, then Token.CheckPacket will be called first. If the call is successful, the packet will be stored in Token.Buffer.

Related Definitions

//******************************************************
// EFI_MTFTP6_TOKEN
//******************************************************
typedef struct {
  EFI_STATUS                  Status;
  EFI_EVENT                   Event;
  EFI_MTFTP6_OVERRIDE_DATA    OverrideData;
  UINT8                       *Filename;
  UINT8                       *ModeStr;
  UINT32                      OptionCount;
  EFI_MTFTP6_OPTION           OptionList;
  UINT64                      BufferSize;
  VOID                        *Buffer;
  VOID                        *Context;
  EFI_MTFTP6_CHECK_PACKET     CheckPacket;
  EFI_MTFTP6_TIMEOUT_CALLBACK TimeoutCallback;
  EFI_MTFTP6_PACKET_NEEDED    PacketNeeded;
}  EFI_MTFTP6_TOKEN;

Status: The status that is returned to the caller at the end of the operation to indicate whether this operation completed successfully. Defined Status values are listed below.
Event: The event that will be signaled when the operation completes. If set to NULL, the corresponding function will wait until the read or write operation finishes. The type of Event must be EVT_NOTIFY_SIGNAL.
OverrideData: If not NULL, the data that will be used to override the existing configure data. Type EFI_MTFTP6_OVERRIDE_DATA is defined in EFI_MTFTP6_PROTOCOL .GetInfo().
Filename: Pointer to the null-terminated ASCII file name string.
ModeStr: Pointer to the null-terminated ASCII mode string. If NULL, octet is used.
OptionCount: Number of option/value string pairs.
OptionList: Pointer to an array of option/value string pairs. Ignored if OptionCount is zero. Both a remote server and this driver implementation should support these options. If one or more options are unrecognized by this implementation, it is sent to the remote server without being changed. Type EFI_MTFTP6_OPTION is defined in EFI_MTFTP6_PROTOCOL.GetInfo().
BufferSize: On input, the size, in bytes, of Buffer. On output, the number of bytes transferred.
Buffer: Pointer to the data buffer. Data that is downloaded from the MTFTPv6 server is stored here. Data that is uploaded to the MTFTPv6 server is read from here. Ignored if BufferSize is zero.
Context: Pointer to the context that will be used by CheckPacket, TimeoutCallback and PacketNeeded.
CheckPacket: Pointer to the callback function to check the contents of the received packet. Type EFI_MTFTP6_CHECK_PACKET is defined below.
TimeoutCallback: Pointer to the function to be called when a timeout occurs. Type EFI_MTFTP6_TIMEOUT_CALLBACK is defined below.
PacketNeeded: Pointer to the function to provide the needed packet contents. Only used in WriteFile() operation. Type EFI_MTFTP6_PACKET_NEEDED is defined below.

The EFI_MTFTP6_TOKEN structure is used for both the MTFTPv6 reading and writing operations.

The caller uses this structure to pass parameters and indicate the operation context. After the reading or writing operation completes, the EFI MTFTPv6 Protocol driver updates the Status parameter and the Event is signaled if it is not NULL. The following table lists the status codes that are returned in the Status parameter.

Status Codes Returned in the Status Parameter

EFI_SUCCESS	The data file has been transferred successfully.
EFI_OUT_OF_RESOURCES	Required system resources could not be allocated.
EFI_BUFFER_TOO_SMALL	BufferSize is not zero but not large enough to hold the downloaded data in downloading process.
EFI_ABORTED	Current operation is aborted by user.
EFI_NETWORK_UNREACHABLE	An ICMP network unreachable error packet was received.
EFI_NETWORK_UNREACHABLE	An ICMP host unreachable error packet was received.
EFI_NETWORK_UNREACHABLE	An ICMP protocol unreachable error packet was received.
EFI_NETWORK_UNREACHABLE	An ICMP port unreachable error packet was received.
EFI_ICMP_ERROR	Some other ICMP ERROR packet was received.
EFI_TIMEOUT	No responses were received from the MTFTPv6 server.
EFI_TFTP_ERROR	An MTFTPv6 ERROR packet was received.
EFI_DEVICE_ERROR	An unexpected network error or system error occurred.

//******************************************************
// EFI_MTFTP6_CHECK_PACKET
//******************************************************
typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP6_CHECK_PACKET)(
  IN EFI_MTFTP6_PROTOCOL       *This,
  IN EFI_MTFTP6_TOKEN          *Token,
  IN UINT16                    PacketLen,
  IN EFI_MTFTP6_PACKET         *Packet
  );

This: Pointer to the EFI_MTFTP6_PROTOCOL instance.
Token: The token that the caller provided in the EFI_MTFTP6_PROTOCOl.ReadFile(), WriteFile() or ReadDirectory() function. Type EFI_MTFTP6_TOKEN is defined in EFI_MTFTP6_PROTOCOL.ReadFile().
PacketLen: Indicates the length of the packet.
Packet: Pointer to an MTFTPv6 packet. Type EFI_MTFTP6_PACKET is defined in EFI_MTFTP6_PROTOCOL.GetInfo().

EFI_MTFTP6_CHECK_PACKET is a callback function that is provided by the caller to intercept the EFI_MTFTP6_OPCODE_DATA or

EFI_MTFTP6_OPCODE_DATA8 packets processed in the

EFI_MTFTP6_PROTOCOL.ReadFile() function, and alternatively to intercept

EFI_MTFTP6_OPCODE_OACK or EFI_MTFTP6_OPCODE_ERROR packets during a call to

EFI_MTFTP6_PROTOCOL.ReadFile(), WriteFile() or ReadDirectory(). Whenever an MTFTPv6 packet with the type described above is received from a server, the EFI MTFTPv6 Protocol driver will call

EFI_MTFTP6_CHECK_PACKET function to let the caller have an opportunity to process this packet. Any status code other than EFI_SUCCESS that is returned from this function will abort the transfer process.

//******************************************************
// EFI_MTFTP6_TIMEOUT_CALLBACK
//******************************************************
typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP6_TIMEOUT_CALLBACK)(
  IN EFI_MTFTP6_PROTOCOL           *This,
  IN EFI_MTFTP6_TOKEN              *Token
  );

This: Pointer to the EFI_MTFTP6_PROTOCOL instance.
Token: The token that is provided in the

EFI_MTFTP6_PROTOCOL.ReadFile() or

EFI_MTFTP6_PROTOCOL.ReadDirectory() functions by the caller. Type

EFI_MTFTP6_TOKEN is defined in

EFI_MTFTP6_PROTOCOL.ReadFile().

EFI_MTFTP6_TIMEOUT_CALLBACK is a callback function that the caller provides to capture the timeout event in the EFI_MTFTP6_PROTOCOL.ReadFile(), EFI_MTFTP6_PROTOCOL.WriteFile() or EFI_MTFTP6_PROTOCOL.ReadDirectory() functions. Whenever a timeout occurs, the EFI MTFTPv6 Protocol driver will call the EFI_MTFTP6_TIMEOUT_CALLBACK function to notify the caller of the timeout event. Any status code other than EFI_SUCCESS that is returned from this function will abort the current download process.

//******************************************************
// EFI_MTFTP6_PACKET_NEEDED
//******************************************************
typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP6_PACKET_NEEDED)(
  IN EFI_MTFTP6_PROTOCOL       *This,
  IN EFI_MTFTP6_TOKEN          Token,
  IN OUT UINT16                *Length,
  OUT VOID                     **Buffer
  );

This: Pointer to the EFI_MTFTP6_PROTOCOL instance.
Token: The token provided in the EFI_MTFTP6_PROTOCOL.WriteFile() by the caller.
Length: Indicates the length of the raw data wanted on input, and the length the data available on output.
Buffer: Pointer to the buffer where the data is stored.

EFI_MTFTP6_PACKET_NEEDED is a callback function that the caller provides to feed data to the EFI_MTFTP6_PROTOCOL.WriteFile() function. EFI_MTFTP6_PACKET_NEEDED provides another mechanism for the caller to provide data to upload other than a static buffer. The EFI MTFTP6 Protocol driver always calls EFI_MTFTP6_PACKET_NEEDED to get packet data from the caller if no static buffer was given in the initial call to EFI_MTFTP6_PROTOCOL.WriteFile() function. Setting **Length* to zero signals the end of the session. Returning a status code other than EFI_SUCCESS aborts the session.

Status Codes Returned

EFI_SUCCESS	The data file is being downloaded.
EFI_INVALID_PARAMETER	One or more of the parameters is not valid. • This is NULL. • Token is NULL. • Token.Filename is NULL. • Token.OptionCount is not zero and Token.OptionList is NULL. • One or more options in Token.OptionList have wrong format. • Token.Buffer and Token.CheckPacket are both NULL. • Token.OverrideData.ServerIp is not a valid unicast IPv6 address and not set to all zero.
EFI_UNSUPPORTED	One or more options in the Token.OptionList are not supported by this implementation.
EFI_NOT_STARTED	The EFI MTFTPv6 Protocol driver has not been started.
EFI_NO_MAPPING	The underlying IPv6 driver was responsible for choosing a source address for this instance, but no source address was available for use.
EFI_ALREADY_STARTED	This Token is being used in another MTFTPv6 session.
EFI_ACCESS_DENIED	The previous operation has not completed yet.
EFI_OUT_OF_RESOURCES	Required system resources could not be allocated.
EFI_DEVICE_ERROR	An unexpected network error or system error occurred.
EFI_NO_MEDIA	There was a media error.

30.4.2.7. EFI_MTFTP6_PROTOCOL.WriteFile()

Summary

Send a file to an MTFTPv6 server. May be unsupported in some implementations.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP6_WRITE_FILE)(
  IN EFI_MTFTP6_PROTOCOL       *This,
  IN EFI_MTFTP6_TOKEN          *Token
  );

Parameters

This: Pointer to the EFI_MTFTP6_PROTOCOL instance.
Token: Pointer to the token structure to provide the parameters that are used in this function. Type EFI_MTFTP6_TOKEN is defined in EFI_MTFTP6_PROTOCOL.ReadFile().

Description

The WriteFile() function is used to initialize an uploading operation with the given option list and optionally wait for completion. If one or more of the options is not supported by the server, the unsupported options are ignored and a standard TFTP process starts instead. When the upload process completes, whether successfully or not, Token.Event is signaled, and the EFI MTFTPv6 Protocol driver updates Token.Status.

The caller can supply the data to be uploaded in the following two modes:

Through the user-provided buffer
Through a callback function

With the user-provided buffer, the Token.BufferSize field indicates the length of the buffer, and the driver will upload the data in the buffer. With an EFI_MTFTP6_PACKET_NEEDED callback function, the driver will call this callback function to get more data from the user to upload. See the definition of EFI_MTFTP6_PACKET_NEEDED for more information. These two modes cannot be used at the same time. The callback function will be ignored if the user provides the buffer.

Status Codes Returned

EFI_SUCCESS	The upload session has started.
EFI_UNSUPPORTED	The operation is not supported by this implementation.
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE: • This is NULL. • Token is NULL. • Token.Filename is NULL. • Token.OptionCount is not zero and Token.OptionList is NULL. • One or more options in Token.OptionList have wrong format. • Token.Buffer and Token.PacketNeeded are both NULL. • Token.OverrideData.ServerIp is not a valid unicast IPv6 address and not set to all zero.
EFI_UNSUPPORTED	One or more options in the Token.OptionList are not supported by this implementation.
EFI_NOT_STARTED	The EFI MTFTPv6 Protocol driver has not been started.
EFI_NO_MAPPING	The underlying IPv6 driver was responsible for choosing a source address for this instance, but no source address was available for use.
EFI_ALREADY_STARTED	This Token is already being used in another MTFTPv6 session.
EFI_OUT_OF_RESOURCES	Required system resources could not be allocated.
EFI_ACCESS_DENIED	The previous operation has not completed yet.
EFI_DEVICE_ERROR	An unexpected network error or system error occurred.
EFI_NO_MEDIA	There was a media error.

30.4.2.8. EFI_MTFTP6_PROTOCOL.ReadDirectory()

Summary

Download a data file directory from an MTFTPv6 server. May be unsupported in some implementations.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP6_READ_DIRECTORY)(
  IN EFI_MTFTP6_PROTOCOL           *This,
  IN EFI_MTFTP6_TOKEN              *Token
);

Parameters

This: Pointer to the EFI_MTFTP6_PROTOCOL instance.
Token: Pointer to the token structure to provide the parameters that are used in this function. Type EFI_MTFTP6_TOKEN is defined in EFI_MTFTP6_PROTOCOL.ReadFile().

Description

The ReadDirectory() function is used to return a list of files on the MTFTPv6 server that are logically (or operationally) related to Token.Filename. The directory request packet that is sent to the server is built with the option list that was provided by caller, if present.

The file information that the server returns is put into either of the following locations:

A fixed buffer that is pointed to by Token.Buffer
A download service function that is pointed to by Token.CheckPacket

If both Token.Buffer and Token.CheckPacket are used, then Token.CheckPacket will be called first. If the call is successful, the packet will be stored in Token.Buffer.

The returned directory listing in the Token.Buffer or EFI_MTFTP6_PACKET consists of a list of two or three variable-length ASCII strings, each terminated by a null character, for each file in the directory. If the multicast option is involved, the first field of each directory entry is the static multicast IP address and UDP port number that is associated with the file name. The format of the field is ip:ip:ip:ip:port. If the multicast option is not involved, this field and its terminating null character are not present.

The next field of each directory entry is the file name and the last field is the file information string. The information string contains the file size and the create/modify timestamp. The format of the information string is filesize yyyy-mm-dd hh:mm:ss:ffff. The timestamp is Coordinated Universal Time (UTC; also known as Greenwich Mean Time [GMT]).

Status Codes Returned

EFI_SUCCESS	The MTFTPv6 related file “directory” has been downloaded.
EFI_UNSUPPORTED	The EFI MTFTPv6 Protocol driver does not support this function.
EFI_INVALID_PARAMETER	One or more of these conditions is TRUE: • This is NULL. • Token is NULL. • Token.Filename is NULL. • Token.OptionCount is not zero and Token.OptionList is NULL. • One or more options in Token.OptionList have wrong format. • Token.Buffer and Token.CheckPacket are both NULL. • Token.OverrideData.ServerIp is not a valid unicast IPv6 address and not set to all zero.
EFI_UNSUPPORTED	One or more options in the Token.OptionList are not supported by this implementation.
EFI_NOT_STARTED	The EFI MTFTPv6 Protocol driver has not been started.
EFI_NO_MAPPING	The underlying IPv6 driver was responsible for choosing a source address for this instance, but no source address was available for use.
EFI_ALREADY_STARTED	This Token is already being used in another MTFTPv6 session.
EFI_OUT_OF_RESOURCES	Required system resources could not be allocated.
EFI_ACCESS_DENIED	The previous operation has not completed yet.
EFI_DEVICE_ERROR	An unexpected network error or system error occurred.

30.4.2.9. EFI_MTFTP6_PROTOCOL.Poll()

Summary

Polls for incoming data packets and processes outgoing data packets.

Prototype

typedef
EFI_STATUS
(EFIAPI *EFI_MTFTP6_POLL) (
  IN EFI_MTFTP6_PROTOCOL   *This
  );

Parameters

This: Pointer to the EFI_MTFTP6_PROTOCOL instance.

Description

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.

Status Codes Returned

EFI_SUCCESS	Incoming or outgoing data was processed.
EFI_NOT_STARTED	This EFI MTFTPv6 Protocol instance has not been started.
EFI_INVALID_PARAMETER	This is NULL.
EFI_DEVICE_ERROR	An unexpected system or network error occurred.
EFI_TIMEOUT	Data was dropped out of the transmit and/or receive queue. Consider increasing the polling rate.