mirror of https://github.com/acidanthera/audk.git
351 lines
13 KiB
C
351 lines
13 KiB
C
/** @file
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Copyright (c) 2006, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Module Name:
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Dhcp4Option.h
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Abstract:
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To validate, parse and process the DHCP options
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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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typedef enum {
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//
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// RFC1497 vendor extensions
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//
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DHCP_TAG_PAD = 0, // Pad Option
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DHCP_TAG_EOP = 255, // End Option
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DHCP_TAG_NETMASK = 1, // Subnet Mask
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DHCP_TAG_TIME_OFFSET = 2, // Time Offset from UTC
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DHCP_TAG_ROUTER = 3, // Router option,
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DHCP_TAG_TIME_SERVER = 4, // Time Server
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DHCP_TAG_NAME_SERVER = 5, // Name Server
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DHCP_TAG_DNS_SERVER = 6, // Domain Name Server
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DHCP_TAG_LOG_SERVER = 7, // Log Server
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DHCP_TAG_COOKIE_SERVER = 8, // Cookie Server
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DHCP_TAG_LPR_SERVER = 9, // LPR Print Server
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DHCP_TAG_IMPRESS_SERVER = 10, // Impress Server
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DHCP_TAG_RL_SERVER = 11, // Resource Location Server
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DHCP_TAG_HOSTNAME = 12, // Host Name
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DHCP_TAG_BOOTFILE_LEN = 13, // Boot File Size
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DHCP_TAG_DUMP = 14, // Merit Dump File
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DHCP_TAG_DOMAINNAME = 15, // Domain Name
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DHCP_TAG_SWAP_SERVER = 16, // Swap Server
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DHCP_TAG_ROOTPATH = 17, // Root path
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DHCP_TAG_EXTEND_PATH = 18, // Extensions Path
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//
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// IP Layer Parameters per Host
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//
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DHCP_TAG_IPFORWARD = 19, // IP Forwarding Enable/Disable
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DHCP_TAG_NONLOCAL_SRR = 20, // on-Local Source Routing Enable/Disable
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DHCP_TAG_POLICY_SRR = 21, // Policy Filter
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DHCP_TAG_EMTU = 22, // Maximum Datagram Reassembly Size
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DHCP_TAG_TTL = 23, // Default IP Time-to-live
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DHCP_TAG_PATHMTU_AGE = 24, // Path MTU Aging Timeout
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DHCP_TAG_PATHMTU_PLATEAU = 25, // Path MTU Plateau Table
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//
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// IP Layer Parameters per Interface
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//
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DHCP_TAG_IFMTU = 26, // Interface MTU
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DHCP_TAG_SUBNET_LOCAL = 27, // All Subnets are Local
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DHCP_TAG_BROADCAST = 28, // Broadcast Address
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DHCP_TAG_DISCOVER_MASK = 29, // Perform Mask Discovery
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DHCP_TAG_SUPPLY_MASK = 30, // Mask Supplier
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DHCP_TAG_DISCOVER_ROUTE = 31, // Perform Router Discovery
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DHCP_TAG_ROUTER_SOLICIT = 32, // Router Solicitation Address
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DHCP_TAG_STATIC_ROUTE = 33, // Static Route
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//
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// Link Layer Parameters per Interface
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//
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DHCP_TAG_TRAILER = 34, // Trailer Encapsulation
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DHCP_TAG_ARPAGE = 35, // ARP Cache Timeout
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DHCP_TAG_ETHER_ENCAP = 36, // Ethernet Encapsulation
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//
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// TCP Parameters
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//
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DHCP_TAG_TCP_TTL = 37, // TCP Default TTL
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DHCP_TAG_KEEP_INTERVAL = 38, // TCP Keepalive Interval
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DHCP_TAG_KEEP_GARBAGE = 39, // TCP Keepalive Garbage
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//
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// Application and Service Parameters
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//
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DHCP_TAG_NIS_DOMAIN = 40, // Network Information Service Domain
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DHCP_TAG_NIS_SERVER = 41, // Network Information Servers
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DHCP_TAG_NTP_SERVER = 42, // Network Time Protocol Servers
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DHCP_TAG_VENDOR = 43, // Vendor Specific Information
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DHCP_TAG_NBNS = 44, // NetBIOS over TCP/IP Name Server
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DHCP_TAG_NBDD = 45, // NetBIOS Datagram Distribution Server
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DHCP_TAG_NBTYPE = 46, // NetBIOS over TCP/IP Node Type
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DHCP_TAG_NBSCOPE = 47, // NetBIOS over TCP/IP Scope
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DHCP_TAG_XFONT = 48, // X Window System Font Server
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DHCP_TAG_XDM = 49, // X Window System Display Manager
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DHCP_TAG_NISPLUS = 64, // Network Information Service+ Domain
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DHCP_TAG_NISPLUS_SERVER = 65, // Network Information Service+ Servers
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DHCP_TAG_MOBILEIP = 68, // Mobile IP Home Agent
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DHCP_TAG_SMTP = 69, // Simple Mail Transport Protocol Server
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DHCP_TAG_POP3 = 70, // Post Office Protocol (POP3) Server
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DHCP_TAG_NNTP = 71, // Network News Transport Protocol Server
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DHCP_TAG_WWW = 72, // Default World Wide Web (WWW) Server
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DHCP_TAG_FINGER = 73, // Default Finger Server
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DHCP_TAG_IRC = 74, // Default Internet Relay Chat (IRC) Server
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DHCP_TAG_STTALK = 75, // StreetTalk Server
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DHCP_TAG_STDA = 76, // StreetTalk Directory Assistance Server
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DHCP_TAG_CLASSLESS_ROUTE = 121, // Classless Route
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//
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// DHCP Extensions
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//
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DHCP_TAG_REQUEST_IP = 50, // Requested IP Address
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DHCP_TAG_LEASE = 51, // IP Address Lease Time
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DHCP_TAG_OVERLOAD = 52, // Option Overload
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DHCP_TAG_TFTP = 66, // TFTP server name
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DHCP_TAG_BOOTFILE = 67, // Bootfile name
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DHCP_TAG_TYPE = 53, // DHCP Message Type
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DHCP_TAG_SERVER_ID = 54, // Server Identifier
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DHCP_TAG_PARA_LIST = 55, // Parameter Request List
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DHCP_TAG_MESSAGE = 56, // Message
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DHCP_TAG_MAXMSG = 57, // Maximum DHCP Message Size
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DHCP_TAG_T1 = 58, // Renewal (T1) Time Value
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DHCP_TAG_T2 = 59, // Rebinding (T2) Time Value
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DHCP_TAG_VENDOR_CLASS = 60, // Vendor class identifier
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DHCP_TAG_CLIENT_ID = 61 // Client-identifier
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} DHCP_TAGS;
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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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typedef enum {
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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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DHCP_OPTION_SWITCH = 1,
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DHCP_OPTION_INT8,
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DHCP_OPTION_INT16,
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DHCP_OPTION_INT32,
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DHCP_OPTION_IP,
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DHCP_OPTION_IPPAIR
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} DHCP_OPTION_TYPE;
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typedef enum {
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//
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// Value of DHCP overload option
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//
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DHCP_OVERLOAD_FILENAME = 1,
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DHCP_OVERLOAD_SVRNAME = 2,
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DHCP_OVERLOAD_BOTH = 3
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} DHCP_OVERLOAD_TYPE;
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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; // DHCP_TAG_NETMASK
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IP4_ADDR Router; // DHCP_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; // DHCP_TAG_TYPE
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UINT8 Overload; // DHCP_TAG_OVERLOAD
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IP4_ADDR ServerId; // DHCP_TAG_SERVER_ID
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UINT32 Lease; // DHCP_TAG_LEASE
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UINT32 T1; // DHCP_TAG_T1
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UINT32 T2; // DHCP_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 Packet The DHCP packet to check the options for
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@param Check The callback function to be called for each option
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found
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@param 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 Others 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 Packet The packet to validate the options
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@param 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 continous 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 Packet The DHCP packet to parse the options
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@param Count The number of valid dhcp options present in the
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packet
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@param OptionPoint The array that contains the DHCP options. Caller
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should free it.
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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 Buf The buffer to append the option to
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@param Tag The option's tag
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@param DataLen The length of the option's data
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@param 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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IN 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 SeedPacket The seed packet to start with
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@param DeleteCount The number of options to delete
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@param DeleteList The options to delete from the packet
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@param AppendCount The number of options to append
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@param AppendList The options to append to the packet
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@param 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_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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