author | Mathieu Lacage <mathieu.lacage@sophia.inria.fr> |
Tue, 16 Oct 2007 15:57:45 +0200 | |
changeset 1974 | 0d6b3bead74a |
parent 1927 | 7ef830068f1d |
child 2014 | c1bc06ac5152 |
permissions | -rw-r--r-- |
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/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */ |
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/* |
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* Copyright (c) 2005 INRIA |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation; |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
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* Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr> |
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*/ |
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|
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#include "mac-rx-middle.h" |
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#include "ns3/packet.h" |
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#include "wifi-mac-header.h" |
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#include "ns3/assert.h" |
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#include <list> |
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#define noRX_MIDDLE_TRACE 1 |
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#ifdef RX_MIDDLE_TRACE |
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#include <iostream> |
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# define TRACE(x) \ |
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std::cout <<"RX MIDDLE "<<x<<std::endl; |
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#else /* RX_MIDDLE_TRACE */ |
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# define TRACE(x) |
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#endif /* RX_MIDDLE_TRACE */ |
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namespace ns3 { |
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class OriginatorRxStatus { |
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private: |
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typedef std::list<Packet> Fragments; |
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typedef std::list<Packet>::const_iterator FragmentsCI; |
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|
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bool m_defragmenting; |
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uint16_t m_lastSequenceControl; |
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Fragments m_fragments; |
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public: |
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OriginatorRxStatus () { |
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/* this is a magic value necessary. */ |
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m_lastSequenceControl = 0xffff; |
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m_defragmenting = false; |
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} |
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~OriginatorRxStatus () { |
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for (FragmentsCI i = m_fragments.begin (); i != m_fragments.end (); i++) |
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{ |
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// XXX ? |
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} |
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m_fragments.erase (m_fragments.begin (), m_fragments.end ()); |
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} |
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bool IsDeFragmenting (void) { |
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return m_defragmenting; |
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} |
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void AccumulateFirstFragment (Packet const packet) { |
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NS_ASSERT (!m_defragmenting); |
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m_defragmenting = true; |
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m_fragments.push_back (packet); |
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} |
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Packet AccumulateLastFragment (Packet const packet) { |
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NS_ASSERT (m_defragmenting); |
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m_fragments.push_back (packet); |
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m_defragmenting = false; |
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Packet full; |
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for (FragmentsCI i = m_fragments.begin (); i != m_fragments.end (); i++) |
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{ |
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full.AddAtEnd (*i); |
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} |
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m_fragments.erase (m_fragments.begin (), m_fragments.end ()); |
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return full; |
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} |
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void AccumulateFragment (Packet const packet) { |
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NS_ASSERT (m_defragmenting); |
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m_fragments.push_back (packet); |
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} |
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bool IsNextFragment (uint16_t sequenceControl) { |
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if ((sequenceControl >> 4) == (m_lastSequenceControl >> 4) && |
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(sequenceControl & 0x0f) == ((m_lastSequenceControl & 0x0f)+1)) |
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{ |
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return true; |
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} |
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else |
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{ |
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return false; |
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} |
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} |
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uint16_t GetLastSequenceControl (void) |
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{ |
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return m_lastSequenceControl; |
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} |
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void SetSequenceControl (uint16_t sequenceControl) |
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{ |
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m_lastSequenceControl = sequenceControl; |
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} |
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|
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}; |
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|
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MacRxMiddle::MacRxMiddle () |
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{} |
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MacRxMiddle::~MacRxMiddle () |
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113 |
{ |
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114 |
for (OriginatorsI i = m_originatorStatus.begin (); |
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115 |
i != m_originatorStatus.end (); i++) |
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116 |
{ |
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117 |
delete (*i).second; |
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|
118 |
} |
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|
119 |
m_originatorStatus.erase (m_originatorStatus.begin (), |
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|
120 |
m_originatorStatus.end ()); |
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|
121 |
for (QosOriginatorsI i = m_qosOriginatorStatus.begin (); |
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|
122 |
i != m_qosOriginatorStatus.end (); i++) |
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parents:
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changeset
|
123 |
{ |
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changeset
|
124 |
delete (*i).second; |
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|
125 |
} |
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parents:
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|
126 |
m_qosOriginatorStatus.erase (m_qosOriginatorStatus.begin (), |
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parents:
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|
127 |
m_qosOriginatorStatus.end ()); |
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|
128 |
} |
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|
129 |
|
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|
130 |
void |
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|
131 |
MacRxMiddle::SetForwardCallback (ForwardUpCallback callback) |
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|
132 |
{ |
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|
133 |
m_callback = callback; |
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|
134 |
} |
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parents:
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changeset
|
135 |
|
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|
136 |
bool |
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|
137 |
MacRxMiddle::SequenceControlSmaller (int seqca, int seqcb) |
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|
138 |
{ |
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|
139 |
int seqa = seqca >> 4; |
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|
140 |
int seqb = seqcb >> 4; |
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parents:
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|
141 |
int delta = seqb - seqa; |
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|
142 |
TRACE ("seqb="<<seqb<<", seqa="<<seqa<<", delta="<<delta); |
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parents:
diff
changeset
|
143 |
if (delta <= 0 && delta < -2048) |
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|
144 |
{ |
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|
145 |
return true; |
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parents:
diff
changeset
|
146 |
} |
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|
147 |
else if (delta >= 0 && delta < 2048) |
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changeset
|
148 |
{ |
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|
149 |
return true; |
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parents:
diff
changeset
|
150 |
} |
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|
151 |
else |
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changeset
|
152 |
{ |
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|
153 |
return false; |
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parents:
diff
changeset
|
154 |
} |
7ef830068f1d
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parents:
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changeset
|
155 |
} |
7ef830068f1d
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parents:
diff
changeset
|
156 |
|
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parents:
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changeset
|
157 |
|
7ef830068f1d
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changeset
|
158 |
OriginatorRxStatus * |
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changeset
|
159 |
MacRxMiddle::Lookup (WifiMacHeader const *hdr) |
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changeset
|
160 |
{ |
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parents:
diff
changeset
|
161 |
OriginatorRxStatus *originator; |
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parents:
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|
162 |
Mac48Address source = hdr->GetAddr2 (); |
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parents:
diff
changeset
|
163 |
if (hdr->IsQosData () && |
7ef830068f1d
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parents:
diff
changeset
|
164 |
!hdr->GetAddr2 ().IsBroadcast ()) |
7ef830068f1d
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parents:
diff
changeset
|
165 |
{ |
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
166 |
/* only for qos data non-broadcast frames */ |
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parents:
diff
changeset
|
167 |
originator = m_qosOriginatorStatus[std::make_pair(source, hdr->GetQosTid ())]; |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
168 |
if (originator == 0) |
7ef830068f1d
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parents:
diff
changeset
|
169 |
{ |
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parents:
diff
changeset
|
170 |
originator = new OriginatorRxStatus (); |
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parents:
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|
171 |
m_qosOriginatorStatus[std::make_pair(source, hdr->GetQosTid ())] = originator; |
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parents:
diff
changeset
|
172 |
} |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
173 |
} |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
174 |
else |
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
175 |
{ |
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
176 |
/* - management frames |
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parents:
diff
changeset
|
177 |
* - qos data broadcast frames |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
178 |
* - nqos data frames |
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
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|
179 |
* see section 7.1.3.4.1 |
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parents:
diff
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|
180 |
*/ |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
181 |
originator = m_originatorStatus[source]; |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
182 |
if (originator == 0) |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
183 |
{ |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
184 |
originator = new OriginatorRxStatus (); |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
185 |
m_originatorStatus[source] = originator; |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
186 |
} |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
187 |
} |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
188 |
return originator; |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
189 |
} |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
190 |
|
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
191 |
bool |
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
192 |
MacRxMiddle::IsDuplicate (WifiMacHeader const*hdr, |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
193 |
OriginatorRxStatus *originator) const |
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parents:
diff
changeset
|
194 |
{ |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
195 |
if (originator->GetLastSequenceControl () == hdr->GetSequenceControl ()) |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
196 |
{ |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
197 |
return true; |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
198 |
} |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
199 |
return false; |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
200 |
} |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
201 |
|
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
202 |
Packet |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
203 |
MacRxMiddle::HandleFragments (Packet packet, WifiMacHeader const*hdr, |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
204 |
OriginatorRxStatus *originator, bool *complete) |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
205 |
{ |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
206 |
if (originator->IsDeFragmenting ()) |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
207 |
{ |
7ef830068f1d
add MacRxMiddle to build
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
208 |
if (hdr->IsMoreFragments ()) |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
209 |
{ |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
210 |
if (originator->IsNextFragment (hdr->GetSequenceControl ())) |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
211 |
{ |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
212 |
TRACE ("accumulate fragment seq="<<hdr->GetSequenceNumber ()<< |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
213 |
", frag="<<hdr->GetFragmentNumber ()<< |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
214 |
", size="<<packet.GetSize ()); |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
215 |
originator->AccumulateFragment (packet); |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
216 |
originator->SetSequenceControl (hdr->GetSequenceControl ()); |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
217 |
} |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
218 |
else |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
219 |
{ |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
220 |
TRACE ("non-ordered fragment"); |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
221 |
} |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
222 |
*complete = false; |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
223 |
return Packet (); |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
224 |
} |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
225 |
else |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
226 |
{ |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
227 |
if (originator->IsNextFragment (hdr->GetSequenceControl ())) |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
228 |
{ |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
229 |
TRACE ("accumulate last fragment seq="<<hdr->GetSequenceNumber ()<< |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
230 |
", frag="<<hdr->GetFragmentNumber ()<< |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
231 |
", size="<<hdr->GetSize ()); |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
232 |
packet = originator->AccumulateLastFragment (packet); |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
233 |
originator->SetSequenceControl (hdr->GetSequenceControl ()); |
7ef830068f1d
add MacRxMiddle to build
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
234 |
*complete = true; |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
235 |
return packet; |
7ef830068f1d
add MacRxMiddle to build
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
236 |
} |
7ef830068f1d
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Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
237 |
else |
7ef830068f1d
add MacRxMiddle to build
Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
parents:
diff
changeset
|
238 |
{ |
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TRACE ("non-ordered fragment"); |
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*complete = false; |
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return Packet (); |
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} |
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} |
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} |
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else |
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{ |
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if (hdr->IsMoreFragments ()) |
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248 |
{ |
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TRACE ("accumulate first fragment seq="<<hdr->GetSequenceNumber ()<< |
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", frag="<<hdr->GetFragmentNumber ()<< |
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", size="<<packet.GetSize ()); |
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originator->AccumulateFirstFragment (packet); |
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originator->SetSequenceControl (hdr->GetSequenceControl ()); |
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*complete = false; |
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return Packet (); |
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} |
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else |
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{ |
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*complete = true; |
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return packet; |
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} |
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262 |
} |
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263 |
} |
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264 |
|
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265 |
void |
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MacRxMiddle::Receive (Packet packet, WifiMacHeader const *hdr) |
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{ |
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268 |
OriginatorRxStatus *originator = Lookup (hdr); |
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269 |
if (hdr->IsData ()) |
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270 |
{ |
1974
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271 |
NS_ASSERT (SequenceControlSmaller (originator->GetLastSequenceControl (), |
1927
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272 |
hdr->GetSequenceControl ())); |
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273 |
// filter duplicates. |
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274 |
if (IsDuplicate (hdr, originator)) |
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275 |
{ |
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276 |
TRACE ("duplicate from="<<hdr->GetAddr2 ()<< |
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277 |
", seq="<<hdr->GetSequenceNumber ()<< |
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278 |
", frag="<<hdr->GetFragmentNumber ()); |
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279 |
return; |
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280 |
} |
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281 |
bool complete; |
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282 |
Packet agregate = HandleFragments (packet, hdr, originator, &complete); |
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|
283 |
if (!complete) |
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|
284 |
{ |
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285 |
return; |
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|
286 |
} |
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|
287 |
TRACE ("forwarding data from="<<hdr->GetAddr2 ()<< |
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parents:
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|
288 |
", seq="<<hdr->GetSequenceNumber ()<< |
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parents:
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|
289 |
", frag="<<hdr->GetFragmentNumber ()); |
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parents:
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|
290 |
originator->SetSequenceControl (hdr->GetSequenceControl ()); |
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parents:
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|
291 |
m_callback (agregate, hdr); |
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|
292 |
} |
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|
293 |
else |
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|
294 |
{ |
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|
295 |
TRACE ("forwarding "<<hdr->GetTypeString ()<< |
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parents:
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|
296 |
", seq="<<hdr->GetSequenceNumber ()<< |
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parents:
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changeset
|
297 |
", frag="<<hdr->GetFragmentNumber ()); |
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parents:
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changeset
|
298 |
originator->SetSequenceControl (hdr->GetSequenceControl ()); |
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parents:
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|
299 |
m_callback (packet, hdr); |
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|
300 |
} |
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|
301 |
} |
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|
302 |
|
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|
303 |
} // namespace ns3 |