MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Impl.h

   1 /** @file
   2   EFI DHCP protocol implementation.
   3   RFCs supported are:
   4   RFC 2131: Dynamic Host Configuration Protocol
   5   RFC 2132: DHCP Options and BOOTP Vendor Extensions
   6   RFC 1534: Interoperation Between DHCP and BOOTP
   7   RFC 3396: Encoding Long Options in DHCP.
   8
   9 Copyright (c) 2006 - 2008, Intel Corporation.<BR>
  10 All rights reserved. This program and the accompanying materials
  11 are licensed and made available under the terms and conditions of the BSD License
  12 which accompanies this distribution.  The full text of the license may be found at
  13 http://opensource.org/licenses/bsd-license.php
  14
  15 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  16 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  17
  18 **/
  19
  20 #ifndef __EFI_DHCP4_IMPL_H__
  21 #define __EFI_DHCP4_IMPL_H__
  22
  23
  24
  25 #include <Uefi.h>
  26
  27 #include <Protocol/Dhcp4.h>
  28 #include <Protocol/Udp4.h>
  29
  30 #include <Library/DebugLib.h>
  31 #include <Library/UefiDriverEntryPoint.h>
  32 #include <Library/UefiBootServicesTableLib.h>
  33 #include <Library/UefiLib.h>
  34 #include <Library/BaseLib.h>
  35 #include <Library/NetLib.h>
  36
  37 typedef struct _DHCP_SERVICE  DHCP_SERVICE;
  38 typedef struct _DHCP_PROTOCOL DHCP_PROTOCOL;
  39
  40 #include "Dhcp4Option.h"
  41 #include "Dhcp4Io.h"
  42
  43 #define DHCP_SERVICE_SIGNATURE   SIGNATURE_32 ('D', 'H', 'C', 'P')
  44 #define DHCP_PROTOCOL_SIGNATURE  SIGNATURE_32 ('d', 'h', 'c', 'p')
  45
  46 typedef enum {
  47   //
  48   // The state of the DHCP service. It starts as UNCONFIGED. If
  49   // and active child configures the service successfully, it
  50   // goes to CONFIGED. If the active child configures NULL, it
  51   // goes back to UNCONFIGED. It becomes DESTORY if it is (partly)
  52   // destoried.
  53   //
  54   DHCP_UNCONFIGED         = 0,
  55   DHCP_CONFIGED,
  56   DHCP_DESTORY
  57 } DHCP_STATE;
  58
  59 struct _DHCP_PROTOCOL {
  60   UINT32                            Signature;
  61   EFI_DHCP4_PROTOCOL                Dhcp4Protocol;
  62   LIST_ENTRY                        Link;
  63   EFI_HANDLE                        Handle;
  64   DHCP_SERVICE                      *Service;
  65
  66   BOOLEAN                           InDestory;
  67
  68   EFI_EVENT                         CompletionEvent;
  69   EFI_EVENT                         RenewRebindEvent;
  70
  71   EFI_DHCP4_TRANSMIT_RECEIVE_TOKEN  *Token;
  72   UDP_IO_PORT                       *UdpIo; // The UDP IO used for TransmitReceive.
  73   UINT32                            Timeout;
  74   NET_BUF_QUEUE                     ResponseQueue;
  75 };
  76
  77 //
  78 // DHCP driver is specical in that it is a singleton. Although it
  79 // has a service binding, there can be only one active child.
  80 //
  81 struct _DHCP_SERVICE {
  82   UINT32                        Signature;
  83   EFI_SERVICE_BINDING_PROTOCOL  ServiceBinding;
  84
  85   INTN                          ServiceState; // CONFIGED, UNCONFIGED, and DESTORY
  86   BOOLEAN                       InDestory;
  87
  88   EFI_HANDLE                    Controller;
  89   EFI_HANDLE                    Image;
  90
  91   LIST_ENTRY                    Children;
  92   UINTN                         NumChildren;
  93
  94   INTN                          DhcpState;
  95   EFI_STATUS                    IoStatus;     // the result of last user operation
  96   UINT32                        Xid;
  97
  98   IP4_ADDR                      ClientAddr;   // lease IP or configured client address
  99   IP4_ADDR                      Netmask;
 100   IP4_ADDR                      ServerAddr;
 101
 102   EFI_DHCP4_PACKET              *LastOffer;   // The last received offer
 103   EFI_DHCP4_PACKET              *Selected;
 104   DHCP_PARAMETER                *Para;
 105
 106   UINT32                        Lease;
 107   UINT32                        T1;
 108   UINT32                        T2;
 109   INTN                          ExtraRefresh; // This refresh is reqested by user
 110
 111   UDP_IO_PORT                   *UdpIo;       // Udp child receiving all DHCP message
 112   UDP_IO_PORT                   *LeaseIoPort; // Udp child with lease IP
 113   NET_BUF                       *LastPacket;  // The last sent packet for retransmission
 114   EFI_MAC_ADDRESS               Mac;
 115   UINT8                         HwType;
 116   UINT8                         HwLen;
 117   UINT8                         ClientAddressSendOut[16];
 118
 119   DHCP_PROTOCOL                 *ActiveChild;
 120   EFI_DHCP4_CONFIG_DATA         ActiveConfig;
 121   UINT32                        UserOptionLen;
 122
 123   //
 124   // Timer event and various timer
 125   //
 126   EFI_EVENT                     Timer;
 127
 128   UINT32                        PacketToLive; // Retransmission timer for our packets
 129   INTN                          CurRetry;
 130   INTN                          MaxRetries;
 131   UINT32                        LeaseLife;
 132 };
 133
 134 typedef struct {
 135   EFI_DHCP4_PACKET_OPTION       **Option;
 136   UINT32                        OptionCount;
 137   UINT32                        Index;
 138 } DHCP_PARSE_CONTEXT;
 139
 140 #define DHCP_INSTANCE_FROM_THIS(Proto)  \
 141   CR ((Proto), DHCP_PROTOCOL, Dhcp4Protocol, DHCP_PROTOCOL_SIGNATURE)
 142
 143 #define DHCP_SERVICE_FROM_THIS(Sb)      \
 144   CR ((Sb), DHCP_SERVICE, ServiceBinding, DHCP_SERVICE_SIGNATURE)
 145
 146 extern EFI_DHCP4_PROTOCOL mDhcp4ProtocolTemplate;
 147
 148 /**
 149   Give up the control of the DHCP service to let other child
 150   resume. Don't change the service's DHCP state and the Client
 151   address and option list configure as required by RFC2131.
 152
 153   @param  DhcpSb                 The DHCP service instance.
 154
 155 **/
 156 VOID
 157 DhcpYieldControl (
 158   IN DHCP_SERVICE           *DhcpSb
 159   );
 160
 161 /**
 162   Complete a Dhcp4 transaction and signal the upper layer.
 163
 164   @param Instance      Dhcp4 instance.
 165
 166 **/
 167 VOID
 168 PxeDhcpDone (
 169   IN DHCP_PROTOCOL  *Instance
 170   );
 171
 172 #endif