mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-27 12:15:19 +01:00
229 lines
7.9 KiB
C
229 lines
7.9 KiB
C
/** @file
|
|
To validate, parse and process the DHCP options.
|
|
|
|
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#ifndef __EFI_DHCP4_OPTION_H__
|
|
#define __EFI_DHCP4_OPTION_H__
|
|
|
|
///
|
|
/// DHCP option tags (types)
|
|
///
|
|
|
|
#define DHCP_OPTION_MAGIC 0x63538263 // Network byte order
|
|
#define DHCP_MAX_OPTIONS 256
|
|
|
|
|
|
//
|
|
// DHCP option types, this is used to validate the DHCP options.
|
|
//
|
|
#define DHCP_OPTION_SWITCH 1
|
|
#define DHCP_OPTION_INT8 2
|
|
#define DHCP_OPTION_INT16 3
|
|
#define DHCP_OPTION_INT32 4
|
|
#define DHCP_OPTION_IP 5
|
|
#define DHCP_OPTION_IPPAIR 6
|
|
|
|
//
|
|
// Value of DHCP overload option
|
|
//
|
|
#define DHCP_OVERLOAD_FILENAME 1
|
|
#define DHCP_OVERLOAD_SVRNAME 2
|
|
#define DHCP_OVERLOAD_BOTH 3
|
|
|
|
///
|
|
/// The DHCP option structure. This structure extends the EFI_DHCP_OPTION
|
|
/// structure to support options longer than 255 bytes, such as classless route.
|
|
///
|
|
typedef struct {
|
|
UINT8 Tag;
|
|
UINT16 Len;
|
|
UINT8 *Data;
|
|
} DHCP_OPTION;
|
|
|
|
///
|
|
/// Structures used to parse the DHCP options with RFC3396 support.
|
|
///
|
|
typedef struct {
|
|
UINT8 Index;
|
|
UINT16 Offset;
|
|
} DHCP_OPTION_COUNT;
|
|
|
|
typedef struct {
|
|
DHCP_OPTION_COUNT *OpCount;
|
|
DHCP_OPTION *Options;
|
|
UINT8 *Buf;
|
|
} DHCP_OPTION_CONTEXT;
|
|
|
|
///
|
|
/// The options that matters to DHCP driver itself. The user of
|
|
/// DHCP clients may be interested in other options, such as
|
|
/// classless route, who can parse the DHCP offer to get them.
|
|
///
|
|
typedef struct {
|
|
IP4_ADDR NetMask; // DHCP4_TAG_NETMASK
|
|
IP4_ADDR Router; // DHCP4_TAG_ROUTER, only the first router is used
|
|
|
|
//
|
|
// DHCP specific options
|
|
//
|
|
UINT8 DhcpType; // DHCP4_TAG_MSG_TYPE
|
|
UINT8 Overload; // DHCP4_TAG_OVERLOAD
|
|
IP4_ADDR ServerId; // DHCP4_TAG_SERVER_ID
|
|
UINT32 Lease; // DHCP4_TAG_LEASE
|
|
UINT32 T1; // DHCP4_TAG_T1
|
|
UINT32 T2; // DHCP4_TAG_T2
|
|
} DHCP_PARAMETER;
|
|
|
|
///
|
|
/// Structure used to describe and validate the format of DHCP options.
|
|
/// Type is the options' data type, such as DHCP_OPTION_INT8. MinOccur
|
|
/// is the minium occurance of this data type. MaxOccur is defined
|
|
/// similarly. If MaxOccur is -1, it means that there is no limit on the
|
|
/// maximum occurance. Alert tells whether DHCP client should further
|
|
/// inspect the option to parse DHCP_PARAMETER.
|
|
///
|
|
typedef struct {
|
|
UINT8 Tag;
|
|
INTN Type;
|
|
INTN MinOccur;
|
|
INTN MaxOccur;
|
|
BOOLEAN Alert;
|
|
} DHCP_OPTION_FORMAT;
|
|
|
|
typedef
|
|
EFI_STATUS
|
|
(*DHCP_CHECK_OPTION) (
|
|
IN UINT8 Tag,
|
|
IN UINT8 Len,
|
|
IN UINT8 *Data,
|
|
IN VOID *Context
|
|
);
|
|
|
|
/**
|
|
Iterate through a DHCP message to visit each option. First inspect
|
|
all the options in the OPTION field. Then if overloaded, inspect
|
|
the options in FILENAME and SERVERNAME fields. One option may be
|
|
encoded in several places. See RFC 3396 Encoding Long Options in DHCP
|
|
|
|
@param[in] Packet The DHCP packet to check the options for
|
|
@param[in] Check The callback function to be called for each option
|
|
found
|
|
@param[in] Context The opaque parameter for Check
|
|
|
|
@retval EFI_SUCCESS The DHCP packet's options are well formated
|
|
@retval EFI_INVALID_PARAMETER The DHCP packet's options are not well formated
|
|
|
|
**/
|
|
EFI_STATUS
|
|
DhcpIterateOptions (
|
|
IN EFI_DHCP4_PACKET *Packet,
|
|
IN DHCP_CHECK_OPTION Check OPTIONAL,
|
|
IN VOID *Context
|
|
);
|
|
|
|
/**
|
|
Validate the packet's options. If necessary, allocate
|
|
and fill in the interested parameters.
|
|
|
|
@param[in] Packet The packet to validate the options
|
|
@param[out] Para The variable to save the DHCP parameters.
|
|
|
|
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory to validate the packet.
|
|
@retval EFI_INVALID_PARAMETER The options are mal-formated
|
|
@retval EFI_SUCCESS The options are parsed into OptionPoint
|
|
|
|
**/
|
|
EFI_STATUS
|
|
DhcpValidateOptions (
|
|
IN EFI_DHCP4_PACKET *Packet,
|
|
OUT DHCP_PARAMETER **Para OPTIONAL
|
|
);
|
|
|
|
/**
|
|
Parse the options of a DHCP packet. It supports RFC 3396: Encoding
|
|
Long Options in DHCP. That is, it will combine all the option value
|
|
of all the occurances of each option.
|
|
A little bit of implemenation:
|
|
It adopts the "Key indexed counting" algorithm. First, it allocates
|
|
an array of 256 DHCP_OPTION_COUNTs because DHCP option tag is encoded
|
|
as a UINT8. It then iterates the DHCP packet to get data length of
|
|
each option by calling DhcpIterOptions with DhcpGetOptionLen. Now, it
|
|
knows the number of present options and their length. It allocates a
|
|
array of DHCP_OPTION and a continuous buffer after the array to put
|
|
all the options' data. Each option's data is pointed to by the Data
|
|
field in DHCP_OPTION structure. At last, it call DhcpIterateOptions
|
|
with DhcpFillOption to fill each option's data to its position in the
|
|
buffer.
|
|
|
|
@param[in] Packet The DHCP packet to parse the options
|
|
@param[out] Count The number of valid dhcp options present in the
|
|
packet
|
|
@param[out] OptionPoint The array that contains the DHCP options. Caller
|
|
should free it.
|
|
|
|
@retval EFI_NOT_FOUND Cannot find any option.
|
|
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory to parse the packet.
|
|
@retval EFI_INVALID_PARAMETER The options are mal-formated
|
|
@retval EFI_SUCCESS The options are parsed into OptionPoint
|
|
|
|
**/
|
|
EFI_STATUS
|
|
DhcpParseOption (
|
|
IN EFI_DHCP4_PACKET *Packet,
|
|
OUT INTN *Count,
|
|
OUT DHCP_OPTION **OptionPoint
|
|
);
|
|
|
|
/**
|
|
Append an option to the memory, if the option is longer than
|
|
255 bytes, splits it into several options.
|
|
|
|
@param[out] Buf The buffer to append the option to
|
|
@param[in] Tag The option's tag
|
|
@param[in] DataLen The length of the option's data
|
|
@param[in] Data The option's data
|
|
|
|
@return The position to append the next option
|
|
|
|
**/
|
|
UINT8 *
|
|
DhcpAppendOption (
|
|
OUT UINT8 *Buf,
|
|
IN UINT8 Tag,
|
|
IN UINT16 DataLen,
|
|
IN UINT8 *Data
|
|
);
|
|
|
|
/**
|
|
Build a new DHCP packet from a seed packet. Options may be deleted or
|
|
appended. The caller should free the NewPacket when finished using it.
|
|
|
|
@param[in] SeedPacket The seed packet to start with
|
|
@param[in] DeleteCount The number of options to delete
|
|
@param[in] DeleteList The options to delete from the packet
|
|
@param[in] AppendCount The number of options to append
|
|
@param[in] AppendList The options to append to the packet
|
|
@param[out] NewPacket The new packet, allocated and built by this
|
|
function.
|
|
|
|
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory
|
|
@retval EFI_INVALID_PARAMETER The options in SeekPacket are mal-formated
|
|
@retval EFI_SUCCESS The packet is build.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
DhcpBuild (
|
|
IN EFI_DHCP4_PACKET *SeedPacket,
|
|
IN UINT32 DeleteCount,
|
|
IN UINT8 *DeleteList OPTIONAL,
|
|
IN UINT32 AppendCount,
|
|
IN EFI_DHCP4_PACKET_OPTION *AppendList[] OPTIONAL,
|
|
OUT EFI_DHCP4_PACKET **NewPacket
|
|
);
|
|
|
|
#endif
|