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1 // Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.symbianfoundation.org/legal/licencesv10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // arp_hdr.h - ARP header structure |
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15 // ARP header structure. |
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16 // |
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17 |
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18 |
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19 |
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20 /** |
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21 @file arp_hdr.h |
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22 @ingroup ip_packet_formats |
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23 @publishedAll |
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24 @released |
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25 */ |
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26 |
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27 #ifndef __ARP_HDR_H__ |
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28 #define __ARP_HDR_H__ |
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29 |
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30 #include "in_hdr.h" |
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31 |
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32 /** |
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33 * @addtogroup ip_packet_formats |
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34 * @{ |
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35 */ |
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36 |
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37 /** |
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38 * "Fake" protocol number for ARP. |
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39 * |
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40 * This protocol value is only used to recognize the ARP packets |
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41 * coming from the interface. There is no "real" ARP.PRT. |
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42 */ |
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43 const TUint KProtocolArp = 0xFAD; // (get some better value) |
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44 |
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45 const TUint16 KArpProtocolType_IP = 0x0800; // Protocol Type value for IPv4 |
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46 // |
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47 // Hardware types listed only as example, it is assumed that the |
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48 // driver knows its own type... |
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49 // |
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50 const TUint16 KArpHarwareType_ETHERNET = 1; |
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51 const TUint16 KArpHarwareType_IEEE_802 = 6; |
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52 |
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53 /** |
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54 @publishedAll |
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55 @released |
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56 */ |
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57 enum TArpOperation // from RFC-1700 |
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58 { |
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59 EArpOperation_REQUEST = 1, // RFC-826 |
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60 EArpOperation_REPLY = 2, // RFC-826 |
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61 EArpOperation_REQUEST_REVERSE = 3, // RFC-903 |
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62 EArpOperation_REPLY_REVERSE = 4, // RFC-903 |
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63 EArpOperation_DRARP_REQUEST = 5, // |
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64 EArpOperation_DRARP_REPLY = 6, |
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65 EArpOperation_DRARP_ERROR = 7, |
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66 EArpOperation_INARP_REQUEST = 8, // RFC-1293 |
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67 EArpOperation_INARP_REPLY = 9, // RFC-1293 |
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68 EArpOperation_ARP_NAK = 10 |
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69 }; |
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70 |
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71 |
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72 class TInet6HeaderArp |
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73 /** |
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74 * ARP Header. |
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75 * |
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76 @verbatim |
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77 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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78 | Hardware Type | Protocol Type | |
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79 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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80 | HwAddrLen | PrAddrLen | ARP Operation | |
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81 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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82 | Sender's physical hardware address | |
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83 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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84 | Sender's protocol address | |
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85 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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86 | Target's physical hardware address | |
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87 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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88 | Target's protocol address | |
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89 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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90 @endverbatim |
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91 * @note |
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92 * This definition covers only the fixed portion of the |
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93 * message. DO NOT DECLARE A VARIABLE WITH THIS CLASS! |
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94 * @publishedAll |
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95 * @released |
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96 */ |
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97 { |
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98 public: |
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99 inline static TInt MinHeaderLength() {return 8; } |
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100 inline static TInt MaxHeaderLength() {return 128; } |
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101 |
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102 inline TUint8* EndPtr() { return i + HeaderLength(); } |
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103 inline TInt HeaderLength() const { return 8 + 2 * HwAddrLen() + 2 * PrAddrLen(); } // Return true byte length |
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104 |
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105 // Access methods |
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106 |
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107 inline TInt HardwareType() const // Return hardware type value in host order |
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108 { |
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109 return i[0] << 8 | i[1]; |
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110 } |
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111 |
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112 inline TInt ProtocolType() const // Return protocol type value in host order |
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113 { |
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114 return i[2] << 8 | i[3]; |
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115 } |
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116 |
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117 inline TInt HwAddrLen() const // Return hardware address length (in bytes) |
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118 { |
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119 return i[4]; |
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120 } |
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121 |
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122 inline TInt PrAddrLen() const // Return protocol address length (in bytes) |
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123 { |
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124 return i[5]; |
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125 } |
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126 |
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127 inline TInt Operation() const |
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128 { |
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129 return i[6] << 8 | i[7]; |
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130 } |
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131 |
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132 // Access/Modify |
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133 |
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134 inline TPtr8 SenderHwAddr() |
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135 { |
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136 return TPtr8(&i[8], HwAddrLen(), HwAddrLen()); |
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137 } |
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138 inline TPtr8 SenderPrAddr() |
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139 { |
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140 return TPtr8(&i[8] + HwAddrLen(), PrAddrLen(), PrAddrLen()); |
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141 } |
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142 inline TPtr8 TargetHwAddr() |
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143 { |
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144 return TPtr8(&i[8] + HwAddrLen() + PrAddrLen(), HwAddrLen(), HwAddrLen()); |
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145 } |
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146 inline TPtr8 TargetPrAddr() |
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147 { |
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148 return TPtr8(&i[8] + 2*HwAddrLen() + PrAddrLen(), PrAddrLen(), PrAddrLen()); |
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149 } |
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150 |
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151 // Modify |
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152 |
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153 inline void SetHardwareType(TInt aType) // Set hardware type value |
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154 { |
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155 i[1] = (TUint8)aType; |
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156 i[0] = (TUint8)(aType >> 8); |
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157 } |
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158 |
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159 inline void SetProtocolType(TInt aType) // Set protocol type value |
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160 { |
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161 i[3] = (TUint8)aType; |
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162 i[2] = (TUint8)(aType >> 8); |
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163 } |
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164 |
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165 inline void SetHwAddrLen(TInt aLength) // Set hardware address length (in bytes) |
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166 { |
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167 i[4] = (TUint8)aLength; |
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168 } |
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169 |
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170 inline void SetPrAddrLen(TInt aLength) // Set protocol address length (in bytes) |
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171 { |
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172 i[5] = (TUint8)aLength; |
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173 } |
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174 |
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175 inline void SetOperation(TInt aOperation) |
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176 { |
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177 i[7] = (TUint8)aOperation; |
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178 i[6] = (TUint8)(aOperation >> 8); |
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179 } |
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180 |
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181 private: |
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182 union |
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183 { |
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184 TUint8 i[8]; |
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185 TUint32 iAlign; // A dummy member to force the 4 byte alignment |
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186 }; |
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187 }; |
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188 |
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189 /** @} */ |
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190 #endif |