author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 26 Jan 2010 15:23:49 +0200 | |
changeset 0 | af10295192d8 |
child 5 | 1422c6cd3f0c |
permissions | -rw-r--r-- |
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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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// in_pkt.h - packet handling routines |
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// Generic packet handling utility for mapping packet handling to the RMBufChain. |
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// |
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/** |
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@file in_pkt.h |
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@publishedAll |
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@released |
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*/ |
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#ifndef __IN_PKT_H__ |
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#define __IN_PKT_H__ |
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#include <nifmbuf.h> |
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#include "ip6_hdr.h" // ..should eventually be <inet/ip6_hdr.h>? -- msa |
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#include "ip4_hdr.h" |
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#define TPACKETHEAD_FRAGMENT 1 //< Enable iFragment in TPacketHead |
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/** |
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TScopeType is only provided so that "magic" constants can be |
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avoided in the source code. However, the max value cannot be changed |
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to anything from 0xF. The scope type is assumed to be 4 bits long |
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in many occasions. |
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|
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The value of the scope type is directly bound the the IPv6 Scope |
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level - 1. This can be done, as IPv6 Scope level 0 is not legal |
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(or usable) in any context within the stack. |
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This allows our non-standard network scope (= 0x10) to |
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be coded internally in 4 bits (as 0xF). |
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@publishedAll |
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@released |
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@since v7.0s |
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*/ |
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enum TScopeType |
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{ |
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EScopeType_IF = 0x0, //< (= #KIp6AddrScopeNodeLocal - 1), id is interface index |
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EScopeType_IAP = 0x1, //< (= #KIp6AddrScopeLinkLocal - 1). id is IAP number |
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EScopeType_GLOBAL = 0xD,//< (= #KIp6AddrScopeGlobal - 1). id is global scope id |
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// |
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// no symbols defined for types 2..14 (they are also valid) |
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// |
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EScopeType_NET = 0xF //< (= #KIp6AddrScopeNetwork - 1), id is network number (must be the last entry) |
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}; |
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|
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// |
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// TIpHeader |
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// ********* |
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class TIpHeader |
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/** |
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A simple help class that uses a union to merge handling of either an IPv4 or |
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an IPv6 header. |
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@since v7.0 |
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@publishedAll |
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@released |
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*/ |
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{ |
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public: |
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/** |
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Gets the minimum header length. |
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IPv6 header is longer than minimum IPv4 header, thus |
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returned value is for IPv4. This function only defined |
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because it is required when this class is used as template |
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parameter in TInet6Packet. |
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@return Minimum IPv4 header length |
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*/ |
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inline static TInt MinHeaderLength() {return TInet6HeaderIP4::MinHeaderLength(); } |
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/** |
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Gets the maximum header length. |
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IPv6 header always shorter than maximum IPv4 header, thus |
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returned value is for IPv4. This function is only defined |
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because "header mapping" classes are expected to have it. |
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@return Maximum IPv4 header length |
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*/ |
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inline static TInt MaxHeaderLength() {return TInet6HeaderIP4::MaxHeaderLength(); } |
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union |
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{ |
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TInet6HeaderIP4 ip4; |
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TInet6HeaderIP ip6; |
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}; |
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}; |
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// RMBufPacketPeek |
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// *************** |
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107 |
class RMBufPacketPeek : public RMBufChain |
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108 |
/** |
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109 |
Extends RMBufChain to add functions to read packet data as a descriptor |
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110 |
and as an IP header. |
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111 |
|
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112 |
The RMBufChain is assumed to contain the raw packet, without |
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113 |
the info block prepended (e.g. if this class is used for RMBufPacketBase |
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114 |
derived handle, it must be in "unpacked" state). |
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115 |
|
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@since v7.0 |
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117 |
@publishedAll |
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118 |
@released |
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119 |
*/ |
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120 |
{ |
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121 |
public: |
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IMPORT_C TPtr8 Access(TInt aSize, TUint aOffset = 0); |
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123 |
IMPORT_C TIpHeader *GetIpHeader(); |
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}; |
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125 |
|
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126 |
// TPacketHead |
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127 |
// *********** |
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128 |
class TPacketHead |
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129 |
/** |
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130 |
Storage for some precomputed information for an outbound packet flow. |
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131 |
|
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132 |
The outbound TPacketHead is part of the flow context (CFlowContext). |
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133 |
|
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134 |
The CFlowContext::Connect initializes the content from the parameters |
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135 |
of the flow (TFlowInfo) and runs the connection process.. The connection |
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process (MIp6Hook::OpenL and MFlowHook::ReadyL phases) completes the |
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137 |
information. After this, as long as the flow is connected, the content |
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138 |
is mostly frozen and <b>must not be modified by anyone</b>. |
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139 |
|
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140 |
When there is a need to change any flow information, the changes must |
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141 |
be done to the flow parameters (and not to TPacketHead). The change of |
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flow parameters also sets the CFlowContext::iChanged flag, and this |
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eventually causes a new CFlowContext::Connect, which re-initializes |
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144 |
the TPacketHead with the new information. |
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145 |
|
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146 |
For each field in the TPacketHead, the hook writer must follow the |
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basic rule (only for fields that it intends to change): |
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148 |
|
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149 |
- if some field is changed in MIp6Hook::OpenL, then the previous |
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150 |
value should be restored in the MFlowHook::ReadyL. |
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151 |
- an exeception: the hook must omit the restore, if the |
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152 |
previous value was unspecified value (for example, the source |
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153 |
address). |
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154 |
- the content of #iPacket (and #iOffset) are special: they cannot |
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155 |
be modified in the MIp6Hook::OpenL phase. A hook can |
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156 |
modify them only in the MFlowHook::ReadyL phase. And, if the hook |
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157 |
is adding an IP header for tunneling, it must save the current content |
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158 |
of these fields in the ReadyL function, and then clear out the fields |
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(it must make the iPacket empty and zero iOffset). The hook must add |
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160 |
the saved iPacket content below the added tunnel header in |
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161 |
MFlowHook::ApplyL . |
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162 |
|
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163 |
@since v7.0 |
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164 |
@publishedAll |
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165 |
@released |
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166 |
*/ |
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167 |
{ |
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168 |
public: |
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169 |
IMPORT_C TBool ExtHdrGet(TInt aType, TInt& aOfs, TInt& aLen); |
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IMPORT_C TBool ExtHdrGetOrPrependL(TInt aType, TInt& aOfs, TInt& aLen); |
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171 |
IMPORT_C TBool ExtHdrGetOrAppendL(TInt aType, TInt& aOfs, TInt& aLen); |
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172 |
IMPORT_C void AddDestinationOptionL(const TPtrC8& aOption, TUint8 aAlign=0, TUint8 aModulo=4); |
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IMPORT_C void AddDestinationOptionL(const TUint8* aOption, TUint8 aLen, TUint8 aAlign=0, TUint8 aModulo=4); |
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174 |
|
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175 |
public: |
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176 |
/** |
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177 |
"Virtual" IP header. The IPv6 header stucture is used, but the same |
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178 |
format is <b>also</b> used for the IPv4 destinations (Version() == 4, |
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179 |
even though the header format is still IPv6!) |
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180 |
|
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181 |
This header is initialized in the beginning of the OpenL phase |
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182 |
as follows: |
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183 |
@li Version = 0 |
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@li Traffic Class, copied from the flow iOptions.iTrafficClass |
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@li Flow Label = 0 |
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@li Payload Length = 0 (dummy field, not used) |
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@li Next Header, copied from the flow iProtocol |
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@li Hop Limit, copied from the flow iOptions.iHopLimit |
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@li Src Address, copied from the flow Local Address (usually unspecified) |
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@li Dst Address, copied from the flow Remote Address |
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191 |
|
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192 |
At beginning of the ReadyL phase (= at end of OpenL), the destination |
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193 |
address (and iDstId) are used to find a route on the interface. Depending |
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194 |
on whether this address is IPv4 (mapped) or IPv6, the Version field is set |
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195 |
accordingly to either 4 or 6. |
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196 |
|
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197 |
After succesfull completion of the ReadyL, this used for *each* packet |
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which needs an IP header to be generated on send. The Version() determines |
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199 |
whether IPv4 or IPv6 frame is to be generated (this is the initial |
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header in the packet, *before* running outbound ApplyL hooks): |
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201 |
|
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202 |
@verbatim |
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203 |
IPv6 IPv4 |
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Version == 6 ==4 |
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205 |
Traffic Class used as is used as TOS |
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Flow Label used as is ignored |
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Payload Length ignored ignored |
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Next Header used as is used as Protocol |
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Hop Limit used as is used as TTL |
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Src Address used as is used as IPv4 mapped |
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Dst Address used as is used as IPv4 mapped |
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@endverbatim |
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*/ |
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TInet6HeaderIP ip6; |
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/** |
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Contains the scope id associated with the destination address |
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which is stored in #ip6 Dst Address. This id and address must |
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always be considered as a unit. Logically, any change changes |
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both values. |
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220 |
|
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iDstId is initialized from the flow context TFlowInfo::iRemote.Scope() at |
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beginning of the flow connect phase. If application does not define |
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223 |
this scope id, then the system will attempt to choose a default value |
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at beginning of the connect phase. If the default cannot be determined, |
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the flow is put into pending state (and no connect happens). |
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226 |
|
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@par MIp6Hook::OpenL |
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On entry to the OpenL, the iDstId is always non-zero and destination |
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address is specified. If a hook changes the destination address in |
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OpenL method, it must provide the correct id value |
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231 |
which goes with the new destination. If it cannot do this, it |
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must either abort the connect by leaving with an error state, or it |
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can leave with PENDING (> 0) status to signal there is no route |
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for the new destination. |
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If the stack cannot find suitable interface for the destination, then |
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it aborts the connect phase, and the flow is placed into holding state. |
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237 |
|
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@note |
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Only a tunneling hook can safely change the destination |
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address (a use of routing header can also be a kind of |
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tunneling). |
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242 |
|
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@par MFlowHook::ReadyL |
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If the hook changed the destination address (or id) in the OpenL, |
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the ReadyL must restore the original values back. |
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246 |
|
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*/ |
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248 |
TUint32 iDstId; |
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249 |
/** |
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250 |
Contains the scope id associated with the source address |
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which is stored in #ip6 Src address. This is defined when the source |
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address is defined, and otherwise undefined. |
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253 |
|
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iSrcId is initialized from TFlowInfo::iLocal.Scope() at beginning of the |
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255 |
flow connect phase. If application defines the source address, |
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but does not specify this scope id, then the system chooses |
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the id based on the interface defined by the source address. |
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If scope and address are both specified, they must match the |
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259 |
selected interface. |
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260 |
|
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@par MIp6Hook::OpenL |
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262 |
On entry to the OpenL, the iSrcId (and source address) may be |
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undefined (#iSourceSet = 0). If defined (iSourceSet = 1), then |
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both address and iSrcId are defined (iSrcId != 0). A hook may |
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265 |
force a reselection of the source just by zeroing the |
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iSourceSet. |
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267 |
|
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@par MFlowHook::ReadyL |
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269 |
If the hook changed the source address (or id) in the OpenL, |
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the ReadyL must restore the original values back, but only |
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if the original value was defined (#iSourceSet = 1 in OpenL). |
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*/ |
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273 |
TUint32 iSrcId; |
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274 |
/** |
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275 |
The source address has been set. |
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276 |
|
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This bit indicates whether the value stored in #ip6 src field |
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and #iSrcId is to be used as a source address as is. |
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279 |
|
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Initialized from TFlowInfo::iLocalSet, which tells whether user |
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281 |
specified tbe source address or not (e.g used RSocket Bind method). |
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282 |
The stack checks the value after each MIp6Hook::OpenL call, and |
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283 |
if the flag is set, the source in ip6 is used as is. If the flag |
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284 |
is zero, then the stack performs the normal source address selection |
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285 |
based on the current destination address (#iSrcId and destination |
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286 |
address). |
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287 |
|
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@par MIp6Hook::OpenL |
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289 |
On entry, this flag is always set and source address is defined. |
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290 |
A hook may clear this flag, if it wants the |
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291 |
stack choose the source address based on current destination. |
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292 |
The clearing operation is normally needed only by a tunneling |
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293 |
hook. |
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294 |
|
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295 |
@note |
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296 |
If the hook specifies the source address, it must be either |
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297 |
a valid source address for the interface or unspecified |
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298 |
address. |
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299 |
|
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300 |
@par MFlowHook::ReadyL |
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301 |
Upon entry to the ReadyL, the source address is always fully |
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302 |
known (the hook can assume that #iSrcId and the #ip6 source |
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303 |
addresses are valid). |
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304 |
If the source address was set before the OpenL, then this |
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305 |
must restore the original value (along with the #iSrcId |
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306 |
and source address). |
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307 |
*/ |
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308 |
TUint iSourceSet:1; |
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309 |
#ifdef TPACKETHEAD_FRAGMENT |
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310 |
/** |
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311 |
The fragment processing alredy done. |
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312 |
|
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313 |
This bit is meaningful only in OpenL phase. If already set, |
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314 |
then some ealier hook has requested that the packet must |
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Revision: 201004
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parents:
diff
changeset
|
315 |
be fragmented to fit the mtu. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
316 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
317 |
A tunneling hook can set this bit in OpenL, if it needs |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
318 |
the fragmenting to happen before the ApplyL is called (e.g. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
319 |
the fragments are tunneled instead of fragmenting the |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
320 |
tunneling). |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
321 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
322 |
This bit can only be set or left as is. It cannot be cleared |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
323 |
once set. |
af10295192d8
Revision: 201004
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diff
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|
324 |
*/ |
af10295192d8
Revision: 201004
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parents:
diff
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|
325 |
TUint iFragment:1; |
af10295192d8
Revision: 201004
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parents:
diff
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|
326 |
#endif |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
327 |
/** |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
328 |
Selector info, the upper layer protocol. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
329 |
|
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
330 |
iProtocol has the same value as ip6.NextHeader() when iPacket is empty, |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
331 |
and otherwise it is the same as NextHeader() of the last extension |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
332 |
header in the iPacket. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
333 |
|
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
334 |
The values of the other selector fields: #iIcmpType, #iIcmpCode |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
335 |
#iSrcPort and #iDstPort depend on iProtocol. Whenever iProtocol |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
336 |
is changed, the other fields must be updated accordingly. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
337 |
|
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
338 |
@par MIp6Hook::OpenL |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
339 |
Because iPacket cannot be modified during the OpenL phase, the |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
340 |
content of this field and the Next Header (protocol) field in |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
341 |
the #ip6 pseudoheader must always be the same. This field should |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
342 |
be considered as <b>read-only</b>, unless the hook intends to |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
343 |
apply IP-in-IP tunneling, in which case the hook <b>must</b> |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
344 |
change the value to the appropriate tunneling protocol |
af10295192d8
Revision: 201004
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parents:
diff
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|
345 |
(#KProtocolInet6Ipip or #KProtocolInetIpip). |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
346 |
|
af10295192d8
Revision: 201004
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parents:
diff
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|
347 |
@par MFlowHook::ReadyL |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
348 |
Only a tunneling hook needs to restore the value here to match |
af10295192d8
Revision: 201004
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parents:
diff
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|
349 |
the original upper layer protocol. See #iPacket for |
af10295192d8
Revision: 201004
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parents:
diff
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|
350 |
more detailed information. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
351 |
*/ |
af10295192d8
Revision: 201004
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parents:
diff
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|
352 |
TUint8 iProtocol; |
af10295192d8
Revision: 201004
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parents:
diff
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|
353 |
/** |
af10295192d8
Revision: 201004
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parents:
diff
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|
354 |
Selector field whose value depends on #iProtocol. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
355 |
|
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
356 |
If this field does not have meaning with the protocol, |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
357 |
the field content should be set to ZERO. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
358 |
*/ |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
359 |
TUint8 iIcmpType; |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
360 |
/** |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
361 |
Selector field whose value depends on #iProtocol. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
362 |
|
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
363 |
If this field does not have meaning with the protocol, |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
364 |
the field content should be set to ZERO. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
365 |
*/ |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
366 |
TUint8 iIcmpCode; |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
367 |
/** |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
368 |
Selector field whose value depends on #iProtocol. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
369 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
370 |
If this field does not have meaning with the protocol, |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
371 |
the field content should be set to ZERO. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
372 |
*/ |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
373 |
TUint16 iSrcPort; |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
374 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
375 |
Selector field whose value depends on #iProtocol. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
376 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
377 |
If this field does not have meaning with the protocol, |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
378 |
the field content should be set to ZERO. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
379 |
*/ |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
380 |
TUint16 iDstPort; |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
381 |
/** |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
382 |
The amount of pre-computed IPv6 extension headers in iPacket which |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
383 |
are copied to the beginning of each outgoing packet |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
384 |
|
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
385 |
If iOffset > 0, then #iPacket includes that much of extension |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
386 |
headers that are copied in front of each packet. |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
387 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
388 |
TInt iOffset; |
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
389 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
390 |
Pre-computed extension headers for all packets in this flow. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
391 |
|
af10295192d8
Revision: 201004
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parents:
diff
changeset
|
392 |
These can only be added in the ReadyL phase. If any of the |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
393 |
ReadyL's adds extension headers into this, it must take care |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
394 |
of maintaining the correct Next Header in the virtual IP header |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
395 |
(and the original upper layer protocol must be placed in the |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
396 |
next header of the last extension header added. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
397 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
398 |
Stack copies the content of this to each outgoing packet, just below |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
399 |
the IP header, before running the ApplyL functions of the outbound |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
400 |
flow hooks. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
401 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
402 |
@par MIp6Hook::OpenL |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
403 |
The iPacket <b>must not</b> be modified during the OpenL phase. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
404 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
405 |
@par MFlowHook::ReadyL |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
406 |
A non-tunneling hook may add extension headers into the current |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
407 |
iPacket. A tunneling hook has more complex requirements: |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
408 |
it must save the current iPacket and #iOffset and initialize |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
409 |
iOffset = 0, and iPacket as empty. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
410 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
411 |
@par MFlowHook::ApplyL |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
412 |
When a tunneling hook adds the tunneling IP header, it |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
413 |
must also copy the saved iPacket below the added IP header. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
414 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
415 |
RMBufPacketPeek iPacket; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
416 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
417 |
The received packet which caused an ICMP error reply to be sent. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
418 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
419 |
This is only used for ICMP error repply flows, and should be |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
420 |
ignored by others -- mainly for IPSEC hook. The packet, if |
af10295192d8
Revision: 201004
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421 |
present, is in unpacked state. |
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*/ |
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423 |
RMBufPacketBase iIcmp; |
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424 |
/** |
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425 |
The current destination interface. |
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426 |
|
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This is ONLY used during connect/OpenL phase. |
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428 |
|
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429 |
The value is maintained by the stack, and is intended as |
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read-only information for the hooks that have a use for |
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431 |
it (for example, IPSEC implementing VPN specific policies). |
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432 |
|
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A hook must not modify this value (the stack will recompute |
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the value after each OpenL, based on the possibly changed |
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435 |
address parameters in the TPacketHead) |
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436 |
|
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@par MIp6Hook::OpenL |
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438 |
<b>read-only</b> |
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@par MFlowHook::ReadyL |
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440 |
<b>read-only</b> |
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*/ |
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442 |
TUint32 iInterfaceIndex; |
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443 |
}; |
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444 |
|
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class TInet6PacketBase |
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446 |
/** |
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* Thin base class for the TInet6Packet. |
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*/ |
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449 |
{ |
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450 |
public: |
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451 |
enum TAlign |
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452 |
{ |
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EAlign1 = 0, //< Align to byte (no align requirement) |
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EAlign2 = 1, //< Align to 2 byte unit (even address) |
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EAlign4 = 3, //< Align to 4 byte unit |
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EAlign8 = 7 //< Align to 8 byte unit |
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}; |
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458 |
|
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459 |
/** |
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460 |
Constructor. |
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461 |
|
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462 |
@param aAlign The align requirement. |
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463 |
*/ |
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464 |
TInet6PacketBase(TAlign aAlign) : iLength(0), iAlign(aAlign) {} |
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465 |
|
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466 |
/** |
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467 |
Length of the mapped region. |
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468 |
|
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469 |
The real mapped length as computed by the Access function. |
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If access returned non-NULL, the following is always TRUE: |
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471 |
|
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@li aMin <= iLength |
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*/ |
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TInt iLength; |
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475 |
|
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IMPORT_C TUint8 *Access(RMBufChain &aPacket, TInt aOffset, TInt aSize, TInt aMin); |
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477 |
|
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inline void SetAlign(TAlign aAlign) |
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479 |
/** |
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480 |
* Changes the align requirement. |
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481 |
* |
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* @param aAlign The new align requirement. |
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*/ |
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484 |
{ |
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iAlign = aAlign; |
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486 |
} |
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487 |
protected: |
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488 |
/** |
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489 |
The align requirement. |
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490 |
*/ |
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491 |
TAlign iAlign; |
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492 |
}; |
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493 |
|
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494 |
// TInet6Packet template |
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495 |
// ********************* |
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496 |
template <class T> |
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class TInet6Packet : public TInet6PacketBase |
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498 |
/** |
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499 |
Encapsulates an IPv6 packet header as a section of an RMBufChain. |
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500 |
|
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501 |
The T template parameter should represent a packet header type. It should |
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502 |
support static functions MaxHeaderLength() and MinHeaderLength() that return |
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TInt values for maximum and minimum header lengths respectively. |
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504 |
|
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505 |
@publishedAll |
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506 |
@released |
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507 |
@since v7.0 |
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508 |
*/ |
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509 |
{ |
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510 |
public: |
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511 |
TInet6Packet(TAlign aAlign = EAlign4) : TInet6PacketBase(aAlign), iHdr(NULL) |
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512 |
/** |
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513 |
Default constructor. |
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514 |
|
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515 |
Construct an empty mapping. To be usable, the Set() function |
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must be used. |
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517 |
*/ |
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518 |
{} |
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519 |
TInet6Packet(RMBufChain &aPacket) : TInet6PacketBase(EAlign4) |
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520 |
/** |
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521 |
Constructor specifying a RMBufChain object. |
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522 |
|
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523 |
Verify and arrange it so that a class T can be mapped |
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524 |
to a contiguous octets from the beginning of the RMBufChain |
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content, and set iHdr to point this area. |
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526 |
|
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527 |
If this is not possible, iHdr is initialized to NULL. |
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528 |
|
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529 |
@param aPacket |
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Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
530 |
Packet containing the header T at offset = 0 |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
531 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
532 |
{ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
533 |
iHdr = (T *)Access(aPacket, 0, T::MaxHeaderLength(), T::MinHeaderLength()); |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
534 |
} |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
535 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
536 |
TInet6Packet(RMBufChain &aPacket, TInt aOffset, TAlign aAlign = EAlign4) : TInet6PacketBase(aAlign) |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
537 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
538 |
Constructor specifying a RMBufChain object and an offset. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
539 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
540 |
Verify and arrange it so that a class T can be mapped |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
541 |
to a contiguous octets starting at specified offset of |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
542 |
the RMBufChain content, and set iHdr to point this area. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
543 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
544 |
If this is not possible, iHdr is initialized to NULL. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
545 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
546 |
@param aPacket |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
547 |
Packet containing the header T at aOffset |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
548 |
@param aOffset |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
549 |
Offset of the header to be mapped. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
550 |
@param aAlign |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
551 |
The alignement requirement. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
552 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
553 |
{ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
554 |
iHdr = (T *)Access(aPacket, aOffset, T::MaxHeaderLength(), T::MinHeaderLength()); |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
555 |
} |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
556 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
557 |
void Set(RMBufChain &aPacket, TInt aOffset, TInt aSize) |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
558 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
559 |
Sets the packet header from a specified RMBufChain object. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
560 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
561 |
Verify and arrange it so that a aSize octets can be mapped |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
562 |
to a contiguous octets starting at specified offset of |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
563 |
the RMBufChain content, and set iHdr to point this area. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
564 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
565 |
If this is not possible, iHdr is initialized to NULL. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
566 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
567 |
Note that this differs from the contructors: the required |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
568 |
size is a parameter, and not determined by the T::MinHeaderLength(). |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
569 |
However, the "T* iHdr" is set to point the start of the requested |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
570 |
area. It's a responsibility of the user of this method to know |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
571 |
whether using this pointer is safe with the specified size parameter. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
572 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
573 |
@param aPacket |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
574 |
Packet containing the header T at aOffset |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
575 |
@param aOffset |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
576 |
Offset (position) of the header to be mapped |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
577 |
@param aSize |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
578 |
Length of required contiguous memory |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
579 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
580 |
{ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
581 |
iHdr = (T *)Access(aPacket, aOffset, aSize, aSize); |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
582 |
} |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
583 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
584 |
inline T& operator()() |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
585 |
{ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
586 |
return *iHdr; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
587 |
} |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
588 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
589 |
The pointer to the mapped region (if non-NULL). If NULL, |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
590 |
then there is no mapping, and iLength == 0. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
591 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
592 |
T *iHdr; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
593 |
}; |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
594 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
595 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
596 |
// TPacketPoker |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
597 |
// ************ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
598 |
class TPacketPoker |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
599 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
600 |
Provides a utility for linear scanning of a chain of RMBuf objects (an RMBufChain). |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
601 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
602 |
An object of this type maintains a current point in the RMBufChain. This point |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
603 |
can only move forward, and a leave occurs if the point advances beyond the |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
604 |
end of the chain. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
605 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
606 |
Any pointers and aligns arranged before the current point, remain valid: for |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
607 |
example, you can save a reference and advance the pointer, and the reference |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
608 |
remains usable. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
609 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
610 |
If instead you need to go to a single specified offset, then use |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
611 |
RMBufChain::Goto() or RMBufPacketPeek::Access(). |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
612 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
613 |
@post |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
614 |
A Generic implementation assert: |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
615 |
after construct, iTail == 0 iff iCurrent == 0 (all scanned), or |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
616 |
in other words: as long as there are bytes after current point, |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
617 |
iTail will be non-zero (and More() returns ETrue). |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
618 |
All methods maintain this invariant or leave, if impossible. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
619 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
620 |
Some other utility methods, not directly related to scanning, are also included. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
621 |
@since v7.0 |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
622 |
@publishedAll |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
623 |
@released |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
624 |
*/ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
625 |
{ |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
626 |
public: |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
627 |
IMPORT_C TPacketPoker(RMBufChain &aChain); |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
628 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
629 |
inline void SkipL(TInt aSize) |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
630 |
/** |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
631 |
Moves the current point forward a specified number of bytes. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
632 |
|
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
633 |
@param aSize Number of bytes to move forward |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
634 |
@leave KErrEof |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
635 |
if the request cannot be satisfied. |
af10295192d8
Revision: 201004
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
636 |
*/ |
af10295192d8
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637 |
{ if (aSize < iTail) { iTail -= aSize; iOffset += aSize; } else OverL(aSize); } |
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638 |
|
af10295192d8
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639 |
inline TUint8 *Ptr() const |
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640 |
/** |
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Revision: 201004
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|
641 |
Raw pointer to the current point (can be invalid, if iTail = 0). |
af10295192d8
Revision: 201004
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642 |
|
af10295192d8
Revision: 201004
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643 |
@note Internal "unsafe" method |
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Revision: 201004
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644 |
*/ |
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Revision: 201004
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645 |
{return iCurrent->Ptr() + iOffset; } |
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Revision: 201004
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|
646 |
|
af10295192d8
Revision: 201004
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647 |
inline TUint8 *ReferenceL(TInt aSize = 1) |
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Revision: 201004
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648 |
/** |
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Revision: 201004
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|
649 |
Gets a pointer to the current point, such that |
af10295192d8
Revision: 201004
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650 |
at least the specified minimum number of bytes can be read. |
af10295192d8
Revision: 201004
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|
651 |
|
af10295192d8
Revision: 201004
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652 |
@param aSize |
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Revision: 201004
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653 |
Specified minimum number of bytes to be read through |
af10295192d8
Revision: 201004
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654 |
the returned pointer. |
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Revision: 201004
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655 |
@return Raw data pointer |
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Revision: 201004
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656 |
@leave KErrEof |
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Revision: 201004
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657 |
if the request cannot be satisfied. |
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Revision: 201004
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658 |
*/ |
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Revision: 201004
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659 |
{ if (iTail >= aSize) return Ptr(); else return AdjustL(aSize); } |
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Revision: 201004
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660 |
|
af10295192d8
Revision: 201004
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661 |
inline TUint8 *ReferenceAndSkipL(TInt aSize) |
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Revision: 201004
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662 |
/** |
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Revision: 201004
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663 |
Gets a pointer to the current point, such that at least the |
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Revision: 201004
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664 |
specified minimum number of bytes can be read, |
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665 |
and moves the point the specified number of bytes forward. |
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666 |
|
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667 |
@param aSize |
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668 |
Specified minimum number of bytes to be read through the returned |
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Revision: 201004
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669 |
pointer, and the number of bytes to move forward |
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670 |
@return |
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Revision: 201004
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671 |
Raw data pointer |
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Revision: 201004
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672 |
@leave KErrEof |
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Revision: 201004
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673 |
if the request cannot be satisfied. |
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Revision: 201004
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674 |
*/ |
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Revision: 201004
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675 |
{ TUint8 *x = ReferenceL(aSize); SkipL(aSize); return x; } |
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676 |
|
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Revision: 201004
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677 |
inline TInt Remainder() const |
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Revision: 201004
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678 |
/** |
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Revision: 201004
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679 |
Gets the length of the contiguous space after the current point. |
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680 |
|
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681 |
@return Length after the current point |
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Revision: 201004
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682 |
*/ |
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Revision: 201004
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683 |
{ return iTail; } |
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Revision: 201004
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684 |
|
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Revision: 201004
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685 |
inline TBool AtBegin() const |
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686 |
/** |
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Revision: 201004
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687 |
Tests whether the current point is at the beginning of an RMBuf. |
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Revision: 201004
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688 |
|
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689 |
@return ETrue if current point is at the beginning |
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Revision: 201004
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690 |
*/ |
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Revision: 201004
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691 |
{ return iOffset == 0; } |
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692 |
|
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693 |
inline TBool More() const |
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Revision: 201004
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/** |
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Revision: 201004
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695 |
Tests whether there is more data to scan. |
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696 |
|
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@return ETrue if there is more data to scan |
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698 |
*/ |
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Revision: 201004
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{ return iTail > 0; } |
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700 |
|
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701 |
IMPORT_C static TBool IsExtensionHeader(TInt aProtocolId); |
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702 |
private: |
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|
703 |
IMPORT_C void OverL(TInt aSize); |
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IMPORT_C TUint8 *AdjustL(TInt aSize); |
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Revision: 201004
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705 |
/** The RMBuf of the current point. */ |
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|
706 |
RMBuf *iCurrent; |
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707 |
/** The offset of the current point in the RMBuf. */ |
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Revision: 201004
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|
708 |
TInt iOffset; |
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Revision: 201004
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|
709 |
/** Remaining bytes starting from the current point in the RMBuf. */ |
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Revision: 201004
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|
710 |
TInt iTail; |
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Revision: 201004
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diff
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|
711 |
}; |
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Revision: 201004
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|
712 |
|
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|
713 |
#endif |