These protocols are used to collect configuration information for the EFI IPv4 Protocol\r
drivers and to provide DHCPv4 server and PXE boot server discovery services.\r
\r
- Copyright (c) 2006 - 2008, Intel Corporation\r
- All rights reserved. This program and the accompanying materials\r
- are licensed and made available under the terms and conditions of the BSD License\r
- which accompanies this distribution. The full text of the license may be found at\r
- http://opensource.org/licenses/bsd-license.php\r
-\r
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r
+This program and the accompanying materials are licensed and made available under \r
+the terms and conditions of the BSD License that accompanies this distribution. \r
+The full text of the license may be found at\r
+http://opensource.org/licenses/bsd-license.php. \r
+ \r
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+\r
+ @par Revision Reference: \r
+ This Protocol was introduced in UEFI Specification 2.0.\r
\r
**/\r
\r
\r
#pragma pack(1)\r
typedef struct {\r
+ ///\r
+ /// DHCP option code.\r
+ ///\r
UINT8 OpCode;\r
+ ///\r
+ /// Length of the DHCP option data. Not present if OpCode is 0 or 255.\r
+ ///\r
UINT8 Length;\r
+ ///\r
+ /// Start of the DHCP option data. Not present if OpCode is 0 or 255 or if Length is zero.\r
+ ///\r
UINT8 Data[1];\r
} EFI_DHCP4_PACKET_OPTION;\r
#pragma pack()\r
\r
\r
#pragma pack(1)\r
+///\r
+/// EFI_DHCP4_PACKET defines the format of DHCPv4 packets. See RFC 2131 for more information.\r
+///\r
typedef struct {\r
- UINT8 OpCode;\r
- UINT8 HwType;\r
- UINT8 HwAddrLen;\r
- UINT8 Hops;\r
- UINT32 Xid;\r
- UINT16 Seconds;\r
- UINT16 Reserved;\r
- EFI_IPv4_ADDRESS ClientAddr; //Client IP address from client\r
- EFI_IPv4_ADDRESS YourAddr; //Client IP address from server\r
- EFI_IPv4_ADDRESS ServerAddr; //IP address of next server in bootstrap\r
- EFI_IPv4_ADDRESS GatewayAddr; //Relay agent IP address\r
- UINT8 ClientHwAddr[16]; //Client hardware address\r
- CHAR8 ServerName[64];\r
- CHAR8 BootFileName[128];\r
+ UINT8 OpCode;\r
+ UINT8 HwType;\r
+ UINT8 HwAddrLen;\r
+ UINT8 Hops;\r
+ UINT32 Xid;\r
+ UINT16 Seconds;\r
+ UINT16 Reserved;\r
+ EFI_IPv4_ADDRESS ClientAddr; ///< Client IP address from client.\r
+ EFI_IPv4_ADDRESS YourAddr; ///< Client IP address from server.\r
+ EFI_IPv4_ADDRESS ServerAddr; ///< IP address of next server in bootstrap.\r
+ EFI_IPv4_ADDRESS GatewayAddr; ///< Relay agent IP address.\r
+ UINT8 ClientHwAddr[16]; ///< Client hardware address.\r
+ CHAR8 ServerName[64];\r
+ CHAR8 BootFileName[128];\r
}EFI_DHCP4_HEADER;\r
#pragma pack()\r
\r
\r
#pragma pack(1)\r
typedef struct {\r
+ ///\r
+ /// Size of the EFI_DHCP4_PACKET buffer.\r
+ ///\r
UINT32 Size;\r
+ ///\r
+ /// Length of the EFI_DHCP4_PACKET from the first byte of the Header field \r
+ /// to the last byte of the Option[] field.\r
+ ///\r
UINT32 Length;\r
\r
struct {\r
+ ///\r
+ /// DHCP packet header.\r
+ ///\r
EFI_DHCP4_HEADER Header;\r
+ ///\r
+ /// DHCP magik cookie in network byte order.\r
+ ///\r
UINT32 Magik;\r
+ ///\r
+ /// Start of the DHCP packed option data.\r
+ ///\r
UINT8 Option[1];\r
} Dhcp4;\r
} EFI_DHCP4_PACKET;\r
\r
\r
typedef enum {\r
+ ///\r
+ /// The EFI DHCPv4 Protocol driver is stopped.\r
+ ///\r
Dhcp4Stopped = 0x0,\r
+ ///\r
+ /// The EFI DHCPv4 Protocol driver is inactive.\r
+ ///\r
Dhcp4Init = 0x1,\r
+ ///\r
+ /// The EFI DHCPv4 Protocol driver is collecting DHCP offer packets from DHCP servers.\r
+ ///\r
Dhcp4Selecting = 0x2,\r
+ ///\r
+ /// The EFI DHCPv4 Protocol driver has sent the request to the DHCP server and is waiting for a response.\r
+ ///\r
Dhcp4Requesting = 0x3,\r
+ ///\r
+ /// The DHCP configuration has completed.\r
+ ///\r
Dhcp4Bound = 0x4,\r
+ ///\r
+ /// The DHCP configuration is being renewed and another request has\r
+ /// been sent out, but it has not received a response from the server yet.\r
+ ///\r
Dhcp4Renewing = 0x5,\r
+ ///\r
+ /// The DHCP configuration has timed out and the EFI DHCPv4\r
+ /// Protocol driver is trying to extend the lease time.\r
+ ///\r
Dhcp4Rebinding = 0x6,\r
+ ///\r
+ /// The EFI DHCPv4 Protocol driver was initialized with a previously\r
+ /// allocated or known IP address.\r
+ ///\r
Dhcp4InitReboot = 0x7,\r
+ ///\r
+ /// The EFI DHCPv4 Protocol driver is seeking to reuse the previously\r
+ /// allocated IP address by sending a request to the DHCP server.\r
+ ///\r
Dhcp4Rebooting = 0x8\r
} EFI_DHCP4_STATE;\r
\r
\r
typedef enum{\r
+ ///\r
+ /// The packet to start the configuration sequence is about to be sent.\r
+ ///\r
Dhcp4SendDiscover = 0x01,\r
+ ///\r
+ /// A reply packet was just received.\r
+ ///\r
Dhcp4RcvdOffer = 0x02,\r
+ ///\r
+ /// It is time for Dhcp4Callback to select an offer.\r
+ ///\r
Dhcp4SelectOffer = 0x03,\r
+ ///\r
+ /// A request packet is about to be sent.\r
+ ///\r
Dhcp4SendRequest = 0x04,\r
+ ///\r
+ /// A DHCPACK packet was received and will be passed to Dhcp4Callback.\r
+ ///\r
Dhcp4RcvdAck = 0x05,\r
+ ///\r
+ /// A DHCPNAK packet was received and will be passed to Dhcp4Callback.\r
+ ///\r
Dhcp4RcvdNak = 0x06,\r
+ ///\r
+ /// A decline packet is about to be sent.\r
+ ///\r
Dhcp4SendDecline = 0x07,\r
+ ///\r
+ /// The DHCP configuration process has completed. No packet is associated with this event.\r
+ ///\r
Dhcp4BoundCompleted = 0x08,\r
+ ///\r
+ /// It is time to enter the Dhcp4Renewing state and to contact the server \r
+ /// that originally issued the network address. No packet is associated with this event.\r
+ ///\r
Dhcp4EnterRenewing = 0x09,\r
+ ///\r
+ /// It is time to enter the Dhcp4Rebinding state and to contact any server. \r
+ /// No packet is associated with this event.\r
+ ///\r
Dhcp4EnterRebinding = 0x0a,\r
+ ///\r
+ /// The configured IP address was lost either because the lease has expired, \r
+ /// the user released the configuration, or a DHCPNAK packet was received in \r
+ /// the Dhcp4Renewing or Dhcp4Rebinding state. No packet is associated with this event.\r
+ ///\r
Dhcp4AddressLost = 0x0b,\r
+ ///\r
+ /// The DHCP process failed because a DHCPNAK packet was received or the user \r
+ /// aborted the DHCP process at a time when the configuration was not available yet. \r
+ /// No packet is associated with this event.\r
+ ///\r
Dhcp4Fail = 0x0c\r
} EFI_DHCP4_EVENT;\r
\r
/**\r
- Callback routine\r
-\r
- @param This Pointer to the EFI DHCPv4 Protocol instance that is used to\r
+ Callback routine.\r
+ \r
+ EFI_DHCP4_CALLBACK is provided by the consumer of the EFI DHCPv4 Protocol driver\r
+ to intercept events that occurred in the configuration process. This structure\r
+ provides advanced control of each state transition of the DHCP process. The\r
+ returned status code determines the behavior of the EFI DHCPv4 Protocol driver.\r
+ There are three possible returned values, which are described in the following\r
+ table.\r
+\r
+ @param This The pointer to the EFI DHCPv4 Protocol instance that is used to\r
configure this callback function.\r
- @param Context Pointer to the context that is initialized by\r
+ @param Context The pointer to the context that is initialized by\r
EFI_DHCP4_PROTOCOL.Configure().\r
@param CurrentState The current operational state of the EFI DHCPv4 Protocol\r
driver.\r
@param NewPacket The packet that is used to replace the above Packet.\r
\r
@retval EFI_SUCCESS Tells the EFI DHCPv4 Protocol driver to continue the DHCP process.\r
+ When it is in the Dhcp4Selecting state, it tells the EFI DHCPv4 Protocol\r
+ driver to stop collecting additional packets. The driver will exit\r
+ the Dhcp4Selecting state and enter the Dhcp4Requesting state.\r
@retval EFI_NOT_READY Only used in the Dhcp4Selecting state. The EFI DHCPv4 Protocol\r
- driver will continue to wait for more DHCPOFFER packets until the retry\r
+ driver will continue to wait for more packets until the retry\r
timeout expires.\r
@retval EFI_ABORTED Tells the EFI DHCPv4 Protocol driver to abort the current process and\r
return to the Dhcp4Init or Dhcp4InitReboot state.\r
OUT EFI_DHCP4_PACKET **NewPacket OPTIONAL\r
);\r
\r
-\r
typedef struct {\r
+ ///\r
+ /// The number of times to try sending a packet during the Dhcp4SendDiscover\r
+ /// event and waiting for a response during the Dhcp4RcvdOffer event.\r
+ /// Set to zero to use the default try counts and timeout values.\r
+ ///\r
UINT32 DiscoverTryCount;\r
+ ///\r
+ /// The maximum amount of time (in seconds) to wait for returned packets in each \r
+ /// of the retries. Timeout values of zero will default to a timeout value \r
+ /// of one second. Set to NULL to use default timeout values.\r
+ ///\r
UINT32 *DiscoverTimeout;\r
+ ///\r
+ /// The number of times to try sending a packet during the Dhcp4SendRequest event\r
+ /// and waiting for a response during the Dhcp4RcvdAck event before accepting\r
+ /// failure. Set to zero to use the default try counts and timeout values.\r
+ ///\r
UINT32 RequestTryCount;\r
+ ///\r
+ /// The maximum amount of time (in seconds) to wait for return packets in each of the retries. \r
+ /// Timeout values of zero will default to a timeout value of one second. \r
+ /// Set to NULL to use default timeout values.\r
+ ///\r
UINT32 *RequestTimeout;\r
+ ///\r
+ /// For a DHCPDISCOVER, setting this parameter to the previously allocated IP\r
+ /// address will cause the EFI DHCPv4 Protocol driver to enter the Dhcp4InitReboot state. \r
+ /// And set this field to 0.0.0.0 to enter the Dhcp4Init state.\r
+ /// For a DHCPINFORM this parameter should be set to the client network address\r
+ /// which was assigned to the client during a DHCPDISCOVER.\r
+ ///\r
EFI_IPv4_ADDRESS ClientAddress;\r
+ ///\r
+ /// The callback function to intercept various events that occurred in \r
+ /// the DHCP configuration process. Set to NULL to ignore all those events.\r
+ ///\r
EFI_DHCP4_CALLBACK Dhcp4Callback;\r
- void *CallbackContext;\r
+ ///\r
+ /// The pointer to the context that will be passed to Dhcp4Callback when it is called.\r
+ ///\r
+ VOID *CallbackContext;\r
+ ///\r
+ /// Number of DHCP options in the OptionList.\r
+ ///\r
UINT32 OptionCount;\r
+ ///\r
+ /// List of DHCP options to be included in every packet that is sent during the\r
+ /// Dhcp4SendDiscover event. Pad options are appended automatically by DHCP driver\r
+ /// in outgoing DHCP packets. If OptionList itself contains pad option, they are\r
+ /// ignored by the driver. OptionList can be freed after EFI_DHCP4_PROTOCOL.Configure()\r
+ /// returns. Ignored if OptionCount is zero.\r
+ ///\r
EFI_DHCP4_PACKET_OPTION **OptionList;\r
} EFI_DHCP4_CONFIG_DATA;\r
\r
\r
typedef struct {\r
+ ///\r
+ /// The EFI DHCPv4 Protocol driver operating state. \r
+ ///\r
EFI_DHCP4_STATE State;\r
+ ///\r
+ /// The configuration data of the current EFI DHCPv4 Protocol driver instance.\r
+ ///\r
EFI_DHCP4_CONFIG_DATA ConfigData;\r
+ ///\r
+ /// The client IP address that was acquired from the DHCP server. If it is zero,\r
+ /// the DHCP acquisition has not completed yet and the following fields in this structure are undefined.\r
+ ///\r
EFI_IPv4_ADDRESS ClientAddress;\r
+ ///\r
+ /// The local hardware address.\r
+ ///\r
EFI_MAC_ADDRESS ClientMacAddress;\r
+ ///\r
+ /// The server IP address that is providing the DHCP service to this client.\r
+ ///\r
EFI_IPv4_ADDRESS ServerAddress;\r
+ ///\r
+ /// The router IP address that was acquired from the DHCP server. \r
+ /// May be zero if the server does not offer this address.\r
+ ///\r
EFI_IPv4_ADDRESS RouterAddress;\r
+ ///\r
+ /// The subnet mask of the connected network that was acquired from the DHCP server.\r
+ ///\r
EFI_IPv4_ADDRESS SubnetMask;\r
+ ///\r
+ /// The lease time (in 1-second units) of the configured IP address. \r
+ /// The value 0xFFFFFFFF means that the lease time is infinite. \r
+ /// A default lease of 7 days is used if the DHCP server does not provide a value.\r
+ ///\r
UINT32 LeaseTime;\r
+ ///\r
+ /// The cached latest DHCPACK or DHCPNAK or BOOTP REPLY packet. May be NULL if no packet is cached.\r
+ ///\r
EFI_DHCP4_PACKET *ReplyPacket;\r
} EFI_DHCP4_MODE_DATA;\r
\r
\r
typedef struct {\r
+ ///\r
+ /// Alternate listening address. It can be a unicast, multicast, or broadcast address.\r
+ ///\r
EFI_IPv4_ADDRESS ListenAddress;\r
+ ///\r
+ /// The subnet mask of above listening unicast/broadcast IP address. \r
+ /// Ignored if ListenAddress is a multicast address.\r
+ ///\r
EFI_IPv4_ADDRESS SubnetMask;\r
+ ///\r
+ /// Alternate station source (or listening) port number. \r
+ /// If zero, then the default station port number (68) will be used.\r
+ ///\r
UINT16 ListenPort;\r
} EFI_DHCP4_LISTEN_POINT;\r
\r
\r
typedef struct {\r
+ ///\r
+ /// The completion status of transmitting and receiving.\r
+ ///\r
EFI_STATUS Status;\r
+ ///\r
+ /// If not NULL, the event that will be signaled when the collection process \r
+ /// completes. If NULL, this function will busy-wait until the collection process competes.\r
+ ///\r
EFI_EVENT CompletionEvent;\r
+ ///\r
+ /// The pointer to the server IP address. This address may be a unicast, multicast, or broadcast address.\r
+ ///\r
EFI_IPv4_ADDRESS RemoteAddress;\r
+ ///\r
+ /// The server listening port number. If zero, the default server listening port number (67) will be used.\r
+ ///\r
UINT16 RemotePort;\r
+ ///\r
+ /// The pointer to the gateway address to override the existing setting.\r
+ ///\r
EFI_IPv4_ADDRESS GatewayAddress;\r
+ ///\r
+ /// The number of entries in ListenPoints. If zero, the default station address and port number 68 are used.\r
+ ///\r
UINT32 ListenPointCount;\r
+ ///\r
+ /// An array of station address and port number pairs that are used as receiving filters. \r
+ /// The first entry is also used as the source address and source port of the outgoing packet.\r
+ ///\r
EFI_DHCP4_LISTEN_POINT *ListenPoints;\r
+ ///\r
+ /// The number of seconds to collect responses. Zero is invalid.\r
+ ///\r
UINT32 TimeoutValue;\r
+ ///\r
+ /// The pointer to the packet to be transmitted.\r
+ ///\r
EFI_DHCP4_PACKET *Packet;\r
+ ///\r
+ /// Number of received packets.\r
+ ///\r
UINT32 ResponseCount;\r
+ ///\r
+ /// The pointer to the allocated list of received packets.\r
+ ///\r
EFI_DHCP4_PACKET *ResponseList;\r
} EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN;\r
\r
\r
/**\r
Returns the current operating mode and cached data packet for the EFI DHCPv4 Protocol driver.\r
+ \r
+ The GetModeData() function returns the current operating mode and cached data\r
+ packet for the EFI DHCPv4 Protocol driver.\r
\r
- @param This Pointer to the EFI_DHCP4_PROTOCOL instance.\r
- @param Dhcp4ModeData Pointer to storage for the EFI_DHCP4_MODE_DATA structure.\r
+ @param This The pointer to the EFI_DHCP4_PROTOCOL instance.\r
+ @param Dhcp4ModeData The pointer to storage for the EFI_DHCP4_MODE_DATA structure.\r
\r
@retval EFI_SUCCESS The mode data was returned.\r
@retval EFI_INVALID_PARAMETER This is NULL.\r
(EFIAPI *EFI_DHCP4_GET_MODE_DATA)(\r
IN EFI_DHCP4_PROTOCOL *This,\r
OUT EFI_DHCP4_MODE_DATA *Dhcp4ModeData\r
- )\r
-;\r
+ );\r
\r
/**\r
Initializes, changes, or resets the operational settings for the EFI DHCPv4 Protocol driver.\r
\r
- @param This Pointer to the EFI_DHCP4_PROTOCOL instance.\r
- @param Dhcp4CfgData Pointer to the EFI_DHCP4_CONFIG_DATA.\r
+ The Configure() function is used to initialize, change, or reset the operational\r
+ settings of the EFI DHCPv4 Protocol driver for the communication device on which\r
+ the EFI DHCPv4 Service Binding Protocol is installed. This function can be\r
+ successfully called only if both of the following are true:\r
+ * This instance of the EFI DHCPv4 Protocol driver is in the Dhcp4Stopped, Dhcp4Init,\r
+ Dhcp4InitReboot, or Dhcp4Bound states.\r
+ * No other EFI DHCPv4 Protocol driver instance that is controlled by this EFI\r
+ DHCPv4 Service Binding Protocol driver instance has configured this EFI DHCPv4\r
+ Protocol driver.\r
+ When this driver is in the Dhcp4Stopped state, it can transfer into one of the\r
+ following two possible initial states:\r
+ * Dhcp4Init\r
+ * Dhcp4InitReboot.\r
+ The driver can transfer into these states by calling Configure() with a non-NULL\r
+ Dhcp4CfgData. The driver will transfer into the appropriate state based on the\r
+ supplied client network address in the ClientAddress parameter and DHCP options\r
+ in the OptionList parameter as described in RFC 2131.\r
+ When Configure() is called successfully while Dhcp4CfgData is set to NULL, the\r
+ default configuring data will be reset in the EFI DHCPv4 Protocol driver and\r
+ the state of the EFI DHCPv4 Protocol driver will not be changed. If one instance\r
+ wants to make it possible for another instance to configure the EFI DHCPv4 Protocol\r
+ driver, it must call this function with Dhcp4CfgData set to NULL.\r
+\r
+ @param This The pointer to the EFI_DHCP4_PROTOCOL instance.\r
+ @param Dhcp4CfgData The pointer to the EFI_DHCP4_CONFIG_DATA.\r
\r
@retval EFI_SUCCESS The EFI DHCPv4 Protocol driver is now in the Dhcp4Init or\r
Dhcp4InitReboot state, if the original state of this driver\r
- was Dhcp4Stopped and the value of Dhcp4CfgData was\r
- not NULL. Otherwise, the state was left unchanged.\r
+ was Dhcp4Stopped, Dhcp4Init,Dhcp4InitReboot, or Dhcp4Bound\r
+ and the value of Dhcp4CfgData was not NULL.\r
+ Otherwise, the state was left unchanged.\r
@retval EFI_ACCESS_DENIED This instance of the EFI DHCPv4 Protocol driver was not in the\r
Dhcp4Stopped, Dhcp4Init, Dhcp4InitReboot, or Dhcp4Bound state;\r
Or onother instance of this EFI DHCPv4 Protocol driver is already\r
in a valid configured state.\r
- @retval EFI_INVALID_PARAMETER Some parameter is NULL.\r
+ @retval EFI_INVALID_PARAMETER One or more following conditions are TRUE:\r
+ This is NULL.\r
+ DiscoverTryCount > 0 and DiscoverTimeout is NULL\r
+ RequestTryCount > 0 and RequestTimeout is NULL.\r
+ OptionCount >0 and OptionList is NULL.\r
+ ClientAddress is not a valid unicast address.\r
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.\r
@retval EFI_DEVICE_ERROR An unexpected system or network error occurred.\r
\r
(EFIAPI *EFI_DHCP4_CONFIGURE)(\r
IN EFI_DHCP4_PROTOCOL *This,\r
IN EFI_DHCP4_CONFIG_DATA *Dhcp4CfgData OPTIONAL\r
- )\r
-;\r
+ );\r
\r
\r
/**\r
Starts the DHCP configuration process.\r
\r
- @param This Pointer to the EFI_DHCP4_PROTOCOL instance.\r
- @param CompletionEvent If not NULL, indicates the event that will be signaled when the\r
+ The Start() function starts the DHCP configuration process. This function can\r
+ be called only when the EFI DHCPv4 Protocol driver is in the Dhcp4Init or\r
+ Dhcp4InitReboot state.\r
+ If the DHCP process completes successfully, the state of the EFI DHCPv4 Protocol\r
+ driver will be transferred through Dhcp4Selecting and Dhcp4Requesting to the\r
+ Dhcp4Bound state. The CompletionEvent will then be signaled if it is not NULL.\r
+ If the process aborts, either by the user or by some unexpected network error,\r
+ the state is restored to the Dhcp4Init state. The Start() function can be called\r
+ again to restart the process.\r
+ Refer to RFC 2131 for precise state transitions during this process. At the\r
+ time when each event occurs in this process, the callback function that was set\r
+ by EFI_DHCP4_PROTOCOL.Configure() will be called and the user can take this\r
+ opportunity to control the process.\r
+ \r
+ @param This The pointer to the EFI_DHCP4_PROTOCOL instance.\r
+ @param CompletionEvent If not NULL, it indicates the event that will be signaled when the\r
EFI DHCPv4 Protocol driver is transferred into the\r
Dhcp4Bound state or when the DHCP process is aborted.\r
EFI_DHCP4_PROTOCOL.GetModeData() can be called to\r
@retval EFI_ALREADY_STARTED Some other EFI DHCPv4 Protocol instance already started the\r
DHCP process.\r
@retval EFI_DEVICE_ERROR An unexpected system or network error occurred.\r
+ @retval EFI_NO_MEDIA There was a media error.\r
\r
**/\r
typedef\r
(EFIAPI *EFI_DHCP4_START)(\r
IN EFI_DHCP4_PROTOCOL *This,\r
IN EFI_EVENT CompletionEvent OPTIONAL\r
- )\r
-;\r
+ );\r
\r
/**\r
Extends the lease time by sending a request packet.\r
-\r
- @param This Pointer to the EFI_DHCP4_PROTOCOL instance.\r
+ \r
+ The RenewRebind() function is used to manually extend the lease time when the\r
+ EFI DHCPv4 Protocol driver is in the Dhcp4Bound state, and the lease time has\r
+ not expired yet. This function will send a request packet to the previously\r
+ found server (or to any server when RebindRequest is TRUE) and transfer the\r
+ state into the Dhcp4Renewing state (or Dhcp4Rebinding when RebindingRequest is\r
+ TRUE). When a response is received, the state is returned to Dhcp4Bound.\r
+ If no response is received before the try count is exceeded (the RequestTryCount\r
+ field that is specified in EFI_DHCP4_CONFIG_DATA) but before the lease time that\r
+ was issued by the previous server expires, the driver will return to the Dhcp4Bound\r
+ state, and the previous configuration is restored. The outgoing and incoming packets\r
+ can be captured by the EFI_DHCP4_CALLBACK function.\r
+\r
+ @param This The pointer to the EFI_DHCP4_PROTOCOL instance.\r
@param RebindRequest If TRUE, this function broadcasts the request packets and enters\r
the Dhcp4Rebinding state. Otherwise, it sends a unicast\r
request packet and enters the Dhcp4Renewing state.\r
IN EFI_DHCP4_PROTOCOL *This,\r
IN BOOLEAN RebindRequest,\r
IN EFI_EVENT CompletionEvent OPTIONAL\r
- )\r
-;\r
+ );\r
\r
/**\r
Releases the current address configuration.\r
\r
- @param This Pointer to the EFI_DHCP4_PROTOCOL instance.\r
+ The Release() function releases the current configured IP address by doing either\r
+ of the following:\r
+ * Sending a DHCPRELEASE packet when the EFI DHCPv4 Protocol driver is in the\r
+ Dhcp4Bound state\r
+ * Setting the previously assigned IP address that was provided with the\r
+ EFI_DHCP4_PROTOCOL.Configure() function to 0.0.0.0 when the driver is in\r
+ Dhcp4InitReboot state\r
+ After a successful call to this function, the EFI DHCPv4 Protocol driver returns\r
+ to the Dhcp4Init state, and any subsequent incoming packets will be discarded silently.\r
+\r
+ @param This The pointer to the EFI_DHCP4_PROTOCOL instance.\r
\r
@retval EFI_SUCCESS The EFI DHCPv4 Protocol driver is now in the Dhcp4Init phase.\r
@retval EFI_INVALID_PARAMETER This is NULL.\r
EFI_STATUS\r
(EFIAPI *EFI_DHCP4_RELEASE)(\r
IN EFI_DHCP4_PROTOCOL *This\r
- )\r
-;\r
+ );\r
\r
/**\r
Stops the current address configuration.\r
+ \r
+ The Stop() function is used to stop the DHCP configuration process. After this\r
+ function is called successfully, the EFI DHCPv4 Protocol driver is transferred\r
+ into the Dhcp4Stopped state. EFI_DHCP4_PROTOCOL.Configure() needs to be called\r
+ before DHCP configuration process can be started again. This function can be\r
+ called when the EFI DHCPv4 Protocol driver is in any state.\r
\r
- @param This Pointer to the EFI_DHCP4_PROTOCOL instance.\r
+ @param This The pointer to the EFI_DHCP4_PROTOCOL instance.\r
\r
@retval EFI_SUCCESS The EFI DHCPv4 Protocol driver is now in the Dhcp4Stopped phase.\r
@retval EFI_INVALID_PARAMETER This is NULL.\r
EFI_STATUS\r
(EFIAPI *EFI_DHCP4_STOP)(\r
IN EFI_DHCP4_PROTOCOL *This\r
- )\r
-;\r
+ );\r
\r
/**\r
Builds a DHCP packet, given the options to be appended or deleted or replaced.\r
\r
- @param This Pointer to the EFI_DHCP4_PROTOCOL instance.\r
- @param SeedPacket Initial packet to be used as a base for building new packet.\r
+ The Build() function is used to assemble a new packet from the original packet\r
+ by replacing or deleting existing options or appending new options. This function\r
+ does not change any state of the EFI DHCPv4 Protocol driver and can be used at\r
+ any time.\r
+\r
+ @param This The pointer to the EFI_DHCP4_PROTOCOL instance.\r
+ @param SeedPacket Initial packet to be used as a base for building new packet.\r
@param DeleteCount Number of opcodes in the DeleteList.\r
@param DeleteList List of opcodes to be deleted from the seed packet.\r
Ignored if DeleteCount is zero.\r
@param AppendCount Number of entries in the OptionList.\r
- @param AppendList Pointer to a DHCP option list to be appended to SeedPacket.\r
+ @param AppendList The pointer to a DHCP option list to be appended to SeedPacket.\r
If SeedPacket also contains options in this list, they are\r
replaced by new options (except pad option). Ignored if\r
AppendCount is zero. Type EFI_DHCP4_PACKET_OPTION\r
- @param NewPacket Pointer to storage for the pointer to the new allocated packet.\r
+ @param NewPacket The pointer to storage for the pointer to the new allocated packet.\r
Use the EFI Boot Service FreePool() on the resulting pointer\r
when done with the packet.\r
\r
@retval EFI_SUCCESS The new packet was built.\r
@retval EFI_OUT_OF_RESOURCES Storage for the new packet could not be allocated.\r
- @retval EFI_INVALID_PARAMETER Some parameter is NULL.\r
+ @retval EFI_INVALID_PARAMETER One or more of the following conditions is TRUE:\r
+ This is NULL.\r
+ SeedPacket is NULL.\r
+ SeedPacket is not a well-formed DHCP packet.\r
+ AppendCount is not zero and AppendList is NULL.\r
+ DeleteCount is not zero and DeleteList is NULL.\r
+ NewPacket is NULL\r
+ Both DeleteCount and AppendCount are zero and\r
+ NewPacket is not NULL.\r
\r
**/\r
typedef\r
IN UINT32 AppendCount,\r
IN EFI_DHCP4_PACKET_OPTION *AppendList[] OPTIONAL,\r
OUT EFI_DHCP4_PACKET **NewPacket\r
- )\r
-;\r
+ );\r
+\r
+\r
/**\r
Transmits a DHCP formatted packet and optionally waits for responses.\r
+ \r
+ The TransmitReceive() function is used to transmit a DHCP packet and optionally\r
+ wait for the response from servers. This function does not change the state of\r
+ the EFI DHCPv4 Protocol driver. It can be used at any time because of this.\r
\r
- @param This Pointer to the EFI_DHCP4_PROTOCOL instance.\r
- @param Token Pointer to the EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN structure.\r
+ @param This The pointer to the EFI_DHCP4_PROTOCOL instance.\r
+ @param Token The pointer to the EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN structure.\r
\r
@retval EFI_SUCCESS The packet was successfully queued for transmission.\r
- @retval EFI_INVALID_PARAMETER Some parameter is NULL.\r
+ @retval EFI_INVALID_PARAMETER One or more of the following conditions is TRUE:\r
+ This is NULL.\r
+ Token.RemoteAddress is zero.\r
+ Token.Packet is NULL.\r
+ Token.Packet is not a well-formed DHCP packet.\r
+ The transaction ID in Token.Packet is in use by another DHCP process.\r
@retval EFI_NOT_READY The previous call to this function has not finished yet. Try to call\r
this function after collection process completes.\r
@retval EFI_NO_MAPPING The default station address is not available yet.\r
@retval EFI_OUT_OF_RESOURCES Required system resources could not be allocated.\r
+ @retval EFI_UNSUPPORTED The implementation doesn't support this function\r
@retval Others Some other unexpected error occurred.\r
\r
**/\r
(EFIAPI *EFI_DHCP4_TRANSMIT_RECEIVE)(\r
IN EFI_DHCP4_PROTOCOL *This,\r
IN EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN *Token\r
- )\r
-;\r
+ );\r
\r
\r
/**\r
Parses the packed DHCP option data.\r
-\r
- @param This Pointer to the EFI_DHCP4_PROTOCOL instance.\r
- @param Packet Pointer to packet to be parsed.\r
+ \r
+ The Parse() function is used to retrieve the option list from a DHCP packet.\r
+ If *OptionCount isn't zero, and there is enough space for all the DHCP options\r
+ in the Packet, each element of PacketOptionList is set to point to somewhere in\r
+ the Packet->Dhcp4.Option where a new DHCP option begins. If RFC3396 is supported,\r
+ the caller should reassemble the parsed DHCP options to get the final result.\r
+ If *OptionCount is zero or there isn't enough space for all of them, the number\r
+ of DHCP options in the Packet is returned in OptionCount.\r
+\r
+ @param This The pointer to the EFI_DHCP4_PROTOCOL instance.\r
+ @param Packet The pointer to packet to be parsed.\r
@param OptionCount On input, the number of entries in the PacketOptionList.\r
On output, the number of entries that were written into the\r
PacketOptionList.\r
- @param PacketOptionList List of packet option entries to be filled in. End option or pad\r
+ @param PacketOptionList A list of packet option entries to be filled in. End option or pad\r
options are not included.\r
\r
@retval EFI_SUCCESS The packet was successfully parsed.\r
- @retval EFI_INVALID_PARAMETER Some parameter is NULL.\r
+ @retval EFI_INVALID_PARAMETER One or more of the following conditions is TRUE:\r
+ This is NULL.\r
+ The packet is NULL.\r
+ The packet is not a well-formed DHCP packet.\r
+ OptionCount is NULL.\r
@retval EFI_BUFFER_TOO_SMALL One or more of the following conditions is TRUE:\r
1) *OptionCount is smaller than the number of options that\r
were found in the Packet.\r
2) PacketOptionList is NULL.\r
+ @retval EFI_OUT_OF_RESOURCE The packet failed to parse because of a resource shortage.\r
\r
**/\r
typedef\r
IN EFI_DHCP4_PACKET *Packet,\r
IN OUT UINT32 *OptionCount,\r
OUT EFI_DHCP4_PACKET_OPTION *PacketOptionList[] OPTIONAL\r
- )\r
-;\r
-\r
-/**\r
- @par Protocol Description:\r
- This protocol is used to collect configuration information for the EFI IPv4 Protocol drivers\r
- and to provide DHCPv4 server and PXE boot server discovery services.\r
-\r
- @param GetModeData \r
- Gets the EFI DHCPv4 Protocol driver status and operational data.\r
-\r
- @param Configure \r
- Initializes, changes, or resets operational settings for the EFI\r
- DHCPv4 Protocol driver.\r
- \r
- @param Start\r
- Starts the DHCP configuration process. \r
- \r
- @param RenewRebind \r
- Tries to manually extend the lease time by sending a request packet.\r
-\r
- @param Release \r
- Releases the current configuration and returns the EFI DHCPv4\r
- Protocol driver to the initial state.\r
- \r
- @param Stop\r
- Stops the DHCP configuration process no matter what state the\r
- driver is in. After being stopped, this driver will not automatically\r
- communicate with the DHCP server.\r
- \r
- @param Build \r
- Puts together a DHCP or PXE packet. \r
- \r
- @param TransmitReceive \r
- Transmits a DHCP or PXE packet and waits for response packets.\r
+ );\r
\r
- @param Parse \r
- Parses the packed DHCP or PXE option data. \r
-**/\r
+///\r
+/// This protocol is used to collect configuration information for the EFI IPv4 Protocol drivers\r
+/// and to provide DHCPv4 server and PXE boot server discovery services.\r
+///\r
struct _EFI_DHCP4_PROTOCOL {\r
EFI_DHCP4_GET_MODE_DATA GetModeData;\r
EFI_DHCP4_CONFIGURE Configure;\r
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