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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 "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.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 // icmp.cpp - dual IPv4/IPv6 ICMP protocol |
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15 // This implements two separate protocol modules (icmp and |
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16 // icmp6). Unlike other transport layers (tcp and udp), ICMP has |
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17 // different protocol identifier in IPv4 and IPv4. Thus, two separate |
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18 // protocol instances is a requirement. |
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19 // |
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20 |
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21 #include "inet6log.h" |
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22 #include "icmp6.h" |
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23 #include "in_net.h" |
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24 #include <icmp6_hdr.h> |
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25 #include <in_pkt.h> |
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26 |
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27 _LIT(KIcmpName, "icmp"); |
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28 _LIT(KIcmp6Name, "icmp6"); |
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29 |
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30 // |
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31 // CProtocolICMP |
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32 // ************* |
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33 // The implementation and methods of the CProtocolICMP4/6 is totally internal |
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34 // to this module. No other module needs to be aware of this. |
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35 // Thus the class definition is included here. |
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36 // |
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37 class CProtocolICMP : public CProtocolInet6Network |
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38 { |
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39 public: |
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40 CProtocolICMP(TInt aProtocol); |
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41 virtual ~CProtocolICMP(); |
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42 virtual CServProviderBase *NewSAPL(TUint aProtocol); |
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43 virtual void Process(RMBufChain &aPacket,CProtocolBase* aSourceProtocol=NULL); |
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44 virtual TInt Send(RMBufChain &aPacket,CProtocolBase* aSourceProtocol=NULL); |
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45 virtual void Identify(TServerProtocolDesc *) const; |
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46 protected: |
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47 const TInt iProtocol; |
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48 }; |
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49 |
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50 // ***** |
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51 // ICMP6 |
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52 // ***** |
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53 CProtocolBase *ICMP6::NewL(TInt aVersion) |
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54 { |
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55 return new (ELeave) CProtocolICMP(aVersion); |
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56 } |
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57 |
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58 void ICMP6::Identify(TServerProtocolDesc &aEntry, TInt aVersion) |
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59 { |
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60 if (aVersion == STATIC_CAST(TInt, KProtocolInetIcmp)) |
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61 { |
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62 aEntry.iName = KIcmpName; |
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63 aEntry.iProtocol=KProtocolInetIcmp; |
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64 } |
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65 else |
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66 { |
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67 aEntry.iName = KIcmp6Name; |
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68 aEntry.iProtocol=KProtocolInet6Icmp; |
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69 } |
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70 aEntry.iAddrFamily=KAfInet; |
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71 aEntry.iSockType=KSockDatagram; |
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72 aEntry.iVersion=TVersion(KInet6MajorVersionNumber, KInet6MinorVersionNumber, KInet6BuildVersionNumber); |
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73 aEntry.iByteOrder=EBigEndian; |
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74 aEntry.iServiceInfo=KICMP6ServiceInfo; |
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75 aEntry.iNamingServices=KICMP6NameServiceInfo; |
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76 aEntry.iSecurity=KSocketNoSecurity; |
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77 aEntry.iMessageSize=KICMP6MaxDatagramSize; |
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78 aEntry.iServiceTypeInfo=KICMP6ServiceTypeInfo; |
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79 aEntry.iNumSockets=KICMP6MaxSockets; |
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80 } |
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81 |
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82 // |
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83 |
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84 // |
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85 // CProtocolICMP* constructors and destructors |
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86 // ******************************************* |
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87 |
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88 CProtocolICMP::CProtocolICMP(TInt aId) : iProtocol(aId) |
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89 { |
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90 __DECLARE_NAME(_S("CProtocolICMP")); |
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91 } |
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92 |
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93 CProtocolICMP::~CProtocolICMP() |
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94 { |
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95 } |
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96 |
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97 // |
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98 // CProtocolICMP::NewSAPL |
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99 // Create a new instance of a CServProviderBase (SAP) for the |
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100 // socket manager. The caller is responsible for the bookkeeping |
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101 // and destruction of this created object! |
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102 // |
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103 CServProviderBase* CProtocolICMP::NewSAPL(TUint aSockType) |
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104 { |
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105 return ICMP6::NewSAPL(aSockType, this, iProtocol); |
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106 } |
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107 |
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108 void CProtocolICMP::Identify(TServerProtocolDesc *aInfo) const |
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109 { |
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110 ICMP6::Identify(*aInfo, iProtocol); |
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111 } |
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112 |
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113 // |
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114 // CProtocolICMP::Send() |
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115 // |
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116 // Pass the packet as is to the IP layer. This method is |
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117 // supposed to be used by the ICMP Service provider modules |
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118 // to forward their packets down the stack. |
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119 // |
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120 // ICMP makes no checks on validity or format of the packet |
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121 // |
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122 TInt CProtocolICMP::Send(RMBufChain &aPacket,CProtocolBase* /*aSourceProtocol*/) |
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123 { |
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124 return iNetwork->Send(aPacket); |
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125 } |
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126 |
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127 |
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128 void CProtocolICMP::Process(RMBufChain &aPacket,CProtocolBase * /*aSourceProtocol*/) |
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129 { |
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130 RMBufRecvPacket packet; |
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131 packet.Assign(aPacket); |
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132 |
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133 for (;;) // ONLY FOR NEAT BREAK EXITS -- NOT A LOOP |
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134 { |
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135 RMBufRecvInfo *const info = packet.Unpack(); |
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136 if (info == NULL) |
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137 break; |
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138 |
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139 LOG(Log::Printf(_L("\t%S Process(%d bytes)"), &ProtocolName(), info->iLength)); |
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140 if (info->iIcmp) |
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141 { |
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142 // This packet is actually an ICMP error report to an ICMP sent by |
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143 // this host. The iOffset points to "inner" ICMP, but tradionally |
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144 // ICMP applications expect the outer RAW ICMP's, thus, change |
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145 // the iOffset and other fields accordingly |
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146 info->iOffset = info->iOffsetIp - 8 /* 8 = ICMP header size*/; |
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147 info->iProtocol = info->iIcmp; |
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148 // *NOTE* |
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149 // The following assumes that outer IP tunnels have been removed |
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150 // from the packet. Then, it can be assumed that the IP header |
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151 // related to ICMP error is at the beginning of the packet (offset=0). |
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152 info->iOffsetIp = 0; |
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153 const MInterface *const mi = NetworkService()->Interfacer()->Interface(info->iInterfaceIndex); |
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154 if (mi == NULL) |
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155 break; |
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156 TIpHeader *const ip = ((RMBufPacketPeek &)packet).GetIpHeader(); |
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157 if (ip == NULL) |
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158 break; |
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159 TInetAddr &src = TInetAddr::Cast(info->iSrcAddr); |
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160 TInetAddr &dst = TInetAddr::Cast(info->iDstAddr); |
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161 if (ip->ip4.Version() == 4) |
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162 { |
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163 src.SetV4MappedAddress(ip->ip4.SrcAddr()); |
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164 dst.SetV4MappedAddress(ip->ip4.DstAddr()); |
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165 } |
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166 else |
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167 { |
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168 src.SetAddress(ip->ip6.SrcAddr()); |
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169 dst.SetAddress(ip->ip6.DstAddr()); |
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170 } |
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171 const TIp6Addr &src_ip = src.Ip6Address(); |
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172 const TIp6Addr &dst_ip = dst.Ip6Address(); |
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173 src.SetScope(mi->Scope((TScopeType)(src_ip.Scope()-1))); |
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174 dst.SetScope(mi->Scope((TScopeType)(dst_ip.Scope()-1))); |
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175 } |
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176 |
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177 // Check "payload length", and don't even try delivering truncated ICMP packets. |
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178 if (info->iLength - info->iOffset < TInet6HeaderICMP::MinHeaderLength()) |
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179 break; |
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180 |
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181 Deliver(packet); |
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182 // *ALWAYS BREAK OUT FROM LOOP* |
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183 break; |
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184 } |
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185 packet.Free(); |
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186 } |