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