author | William Roberts <williamr@symbian.org> |
Wed, 10 Nov 2010 13:36:07 +0000 | |
branch | RCL_3 |
changeset 79 | 4b172931a477 |
parent 0 | af10295192d8 |
permissions | -rw-r--r-- |
0
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// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// Name : 6to4_flow.cpp |
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// Part of : 6to4 plugin / 6to4.prt |
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// Implements 6to4 automatic and configured tunnels, see |
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// RFC 3056 & RFC 2893 |
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// Version : 0.2 |
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// |
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// INCLUDE FILES |
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#include <in_chk.h> |
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#include "6to4_flow.h" |
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// EXTERNAL DATA STRUCTURES |
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// EXTERNAL FUNCTION PROTOTYPES |
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// CONSTANTS |
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// MACROS |
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// LOCAL CONSTANTS AND MACROS |
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// MODULE DATA STRUCTURES |
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// LOCAL FUNCTION PROTOTYPES |
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// FORWARD DECLARATIONS |
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// ============================= LOCAL FUNCTIONS ============================== |
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// ============================ MEMBER FUNCTIONS ============================== |
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// ---------------------------------------------------------------------------- |
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// C6to4FlowInfo::C6to4FlowInfo |
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// ---------------------------------------------------------------------------- |
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C6to4FlowInfo::C6to4FlowInfo(const TPacketHead &aHead) |
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: iInterfaceIndex(aHead.iInterfaceIndex) |
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{ |
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// Need to save the inner selector information which is |
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// restored at ReadyL. |
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iSrcPort = aHead.iSrcPort; |
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iDstPort = aHead.iDstPort; |
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iIcmpType = aHead.iIcmpType; |
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iIcmpCode = aHead.iIcmpCode; |
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iInnerIp = aHead.ip6; |
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iDstId = aHead.iDstId; |
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iSrcId = aHead.iSrcId; |
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} |
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// ---------------------------------------------------------------------------- |
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// C6to4FlowInfo::~C6to4FlowInfo |
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// ---------------------------------------------------------------------------- |
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C6to4FlowInfo::~C6to4FlowInfo () |
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{ |
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iPacket.Free(); |
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} |
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// ---------------------------------------------------------------------------- |
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// 6to4FlowInfo::ReadyL |
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// The stack asks if the flow is ready to send. In the same time, the plugin |
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// configures the source IP address from the flow, including configuring it to |
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// the virtual interface. Set the packet source and destination IP addresses |
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// for the inner (IPv6) header. Set the packet interface index. Set the packet |
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// next header to be the inner header next header and set the packet IP version |
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// to 6. |
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// ---------------------------------------------------------------------------- |
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// |
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TInt C6to4FlowInfo::ReadyL (TPacketHead & aHead) |
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{ |
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// Save the fixed packet content from the TPacketHead |
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iOffset = aHead.iOffset; |
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iPacket.Free(); |
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if (iOffset > 0) |
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{ |
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iPacket.Assign(aHead.iPacket); |
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aHead.iOffset = 0; |
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} |
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|
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// Save the outer IP information |
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iOuterIp = aHead.ip6; |
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// Set inner header source and dest addresses |
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aHead.ip6 = iInnerIp; |
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// Inner Version() is not yet set correctly, make it correct. |
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aHead.ip6.SetVersion(iInnerIp.DstAddr().IsV4Mapped() ? 4 : 6); |
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aHead.iSrcId = iSrcId; |
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aHead.iDstId = iDstId; |
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aHead.iInterfaceIndex = iInterfaceIndex; |
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// Both next header and iProtocol must have the same value |
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// as the iPacket is now empty. |
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aHead.iProtocol = (TUint8)iInnerIp.NextHeader(); |
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aHead.iSrcPort = iSrcPort; |
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aHead.iDstPort = iDstPort; |
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aHead.iIcmpType = iIcmpType; |
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aHead.iIcmpCode = iIcmpCode; |
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106 |
return EFlow_READY; |
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107 |
} |
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108 |
|
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109 |
// ---------------------------------------------------------------------------- |
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110 |
// 6to4FlowInfo::ApplyL |
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111 |
// Final stage where the 6to4 touches the outgoing packet. Space is made for |
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112 |
// the IP header and the IP header is initialized. |
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113 |
// ---------------------------------------------------------------------------- |
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114 |
TInt C6to4FlowInfo::ApplyL (RMBufSendPacket & aPacket, RMBufSendInfo & aInfo) |
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115 |
{ |
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116 |
// Apply the tunnelling |
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117 |
|
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118 |
// Prepend the fixed content (if any) below the IP header |
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119 |
if (iOffset > 0) |
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120 |
{ |
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121 |
RMBufChain work; |
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122 |
// Note: assumed that if CopyL leaves, then work is empty |
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123 |
iPacket.CopyL(work); |
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124 |
aPacket.Prepend(work); |
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125 |
aInfo.iLength += iOffset; |
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126 |
} |
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127 |
switch(iOuterIp.Version()) |
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128 |
{ |
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129 |
case 6: |
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130 |
{ |
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131 |
aPacket.PrependL(sizeof(TInet6HeaderIP)); |
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132 |
aInfo.iLength += sizeof(TInet6HeaderIP); |
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133 |
aInfo.iProtocol = KProtocolInet6Ip; |
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134 |
|
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135 |
TInet6Packet<TInet6HeaderIP> ip(aPacket); |
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136 |
if (ip.iHdr == NULL) |
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137 |
User::Leave(KErrGeneral); |
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138 |
|
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139 |
// Build outer IPv6 header (already in iOuterIp, just copy) |
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140 |
*ip.iHdr = iOuterIp; |
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141 |
// Note: Certain packets must not have ECN ECT bits set. tcp_sap.cpp sets |
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142 |
// KIpNoEcnEct for those packets. |
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143 |
if (aInfo.iFlags & KIpNoEcnEct) |
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144 |
{ |
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145 |
ip.iHdr->SetTrafficClass(ip.iHdr->TrafficClass() & 0xfc); |
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146 |
} |
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147 |
ip.iHdr->SetPayloadLength(aInfo.iLength); |
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148 |
break; |
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149 |
} |
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150 |
case 4: |
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151 |
{ |
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152 |
// Make space for IPv4 header |
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153 |
aPacket.PrependL (20); |
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154 |
aInfo.iLength += 20; |
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155 |
aInfo.iProtocol = KProtocolInetIp; |
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156 |
|
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157 |
TInet6Checksum < TInet6HeaderIP4 > ip (aPacket); |
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158 |
if (ip.iHdr == NULL) |
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159 |
User::Leave (KErrGeneral); |
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160 |
|
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161 |
// Build the outer IPv4 header |
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162 |
ip.iHdr->Init(iOuterIp.TrafficClass() & ((aInfo.iFlags & KIpNoEcnEct) ? 0xfc : 0xff)); |
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163 |
// Raw Address load. Someone else must have already checked that |
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164 |
// both src and dst are IPv4 mapped addresses at the end of the |
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165 |
// ReadyL phase! This just does a blind copy. |
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166 |
ip.iHdr->DstAddrRef() = iOuterIp.DstAddr().u.iAddr32[3]; |
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167 |
ip.iHdr->SrcAddrRef() = iOuterIp.SrcAddr().u.iAddr32[3]; |
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|
168 |
|
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169 |
// Somewhat ad hoc thing: if DontFragment flag is set, then |
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170 |
// set the DF bit to the IPv4 header... |
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171 |
if (aInfo.iFlags & KIpDontFragment) |
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172 |
ip.iHdr->SetFlags((TUint8)(ip.iHdr->Flags() | KInet4IP_DF)); |
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|
173 |
|
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174 |
ip.iHdr->SetHeaderLength (20); |
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175 |
ip.iHdr->SetTotalLength (aInfo.iLength); |
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176 |
ip.iHdr->SetTtl(iOuterIp.HopLimit()); |
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177 |
|
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178 |
// NOTE!!! Something might be done for this. Now it is theoretically |
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179 |
// possible that a same host receives protocol 41 packets from us and |
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180 |
// we have two or more flows with protocol 41 AND two packets get |
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181 |
// fragmented and are reassembled in the same time by the remote host |
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182 |
// AND the IPv4 identifier happens to be the same. That would break the |
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183 |
// reassembly process, but since this is practically "impossible", it is |
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184 |
// left now without a fix. |
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185 |
ip.iHdr->SetIdentification (iPacketID++); |
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|
186 |
ip.iHdr->SetProtocol (iOuterIp.NextHeader()); |
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|
187 |
|
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188 |
// Checksum of the outer header. |
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|
189 |
ip.ComputeChecksum (); |
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190 |
break; |
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|
191 |
} |
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|
192 |
default: |
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|
193 |
User::Leave(KErrGeneral); |
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|
194 |
} |
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|
195 |
|
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196 |
// Pass the packet |
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197 |
return 0; |
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|
198 |
} |
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|
199 |
|
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|
200 |
// ---------------------------------------------------------------------------- |
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|
201 |
// 6to4FlowInfo::Open |
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|
202 |
// Open the flow, keep reference count. |
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|
203 |
// ---------------------------------------------------------------------------- |
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|
204 |
// |
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|
205 |
|
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|
206 |
void C6to4FlowInfo::Open () |
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207 |
{ |
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208 |
iRefs++; |
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|
209 |
} |
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|
210 |
|
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// ---------------------------------------------------------------------------- |
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// 6to4FlowInfo::Close |
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// Close the flow if the reference count has reached zero. Remove the flow |
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// from any list it is stored. |
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// ---------------------------------------------------------------------------- |
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// |
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void C6to4FlowInfo::Close () |
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{ |
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if (--iRefs < 0) |
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{ |
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delete this; |
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} |
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} |
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// ========================== OTHER EXPORTED FUNCTIONS ======================== |
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|
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// End of File |