A Discrete-Event Network Simulator
API
mac-tx-middle.cc
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2005, 2009 INRIA
4  * Copyright (c) 2009 MIRKO BANCHI
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation;
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  *
19  * Authors: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
20  * Mirko Banchi <mk.banchi@gmail.com>
21  * Ghada Badawy <gbadawy@gmail.com>
22  */
23 
24 #include "ns3/log.h"
25 #include "mac-tx-middle.h"
26 #include "wifi-mac-header.h"
27 
28 namespace ns3 {
29 
30 NS_LOG_COMPONENT_DEFINE ("MacTxMiddle");
31 
33  : m_sequence (0)
34 {
35  NS_LOG_FUNCTION (this);
36 }
37 
39 {
40  NS_LOG_FUNCTION (this);
41  for (std::map<Mac48Address,uint16_t*>::const_iterator i = m_qosSequences.begin (); i != m_qosSequences.end (); i++)
42  {
43  delete [] i->second;
44  }
45 }
46 
47 uint16_t
49 {
50  NS_LOG_FUNCTION (this);
51  uint16_t retval;
52  if (hdr->IsQosData ()
53  && !hdr->GetAddr1 ().IsGroup ())
54  {
55  uint8_t tid = hdr->GetQosTid ();
56  NS_ASSERT (tid < 16);
57  std::map<Mac48Address, uint16_t*>::const_iterator it = m_qosSequences.find (hdr->GetAddr1 ());
58  if (it != m_qosSequences.end ())
59  {
60  retval = it->second[tid];
61  it->second[tid]++;
62  it->second[tid] %= 4096;
63  }
64  else
65  {
66  retval = 0;
67  std::pair <Mac48Address,uint16_t*> newSeq (hdr->GetAddr1 (), new uint16_t[16]);
68  std::pair <std::map<Mac48Address,uint16_t*>::const_iterator,bool> newIns = m_qosSequences.insert (newSeq);
69  NS_ASSERT (newIns.second == true);
70  for (uint8_t i = 0; i < 16; i++)
71  {
72  newIns.first->second[i] = 0;
73  }
74  newIns.first->second[tid]++;
75  }
76  }
77  else
78  {
79  retval = m_sequence;
80  m_sequence++;
81  m_sequence %= 4096;
82  }
83  return retval;
84 }
85 
86 uint16_t
88 {
89  NS_LOG_FUNCTION (this);
90  uint16_t retval;
91  if (hdr->IsQosData ()
92  && !hdr->GetAddr1 ().IsGroup ())
93  {
94  uint8_t tid = hdr->GetQosTid ();
95  NS_ASSERT (tid < 16);
96  std::map<Mac48Address, uint16_t*>::const_iterator it = m_qosSequences.find (hdr->GetAddr1 ());
97  if (it != m_qosSequences.end ())
98  {
99  retval = it->second[tid];
100  }
101  else
102  {
103  retval = 0;
104  }
105  }
106  else
107  {
108  retval = m_sequence;
109  }
110  return retval;
111 }
112 
113 uint16_t
115 {
116  NS_LOG_FUNCTION (this);
117  NS_ASSERT (tid < 16);
118  uint16_t seq = 0;
119  std::map <Mac48Address,uint16_t*>::const_iterator it = m_qosSequences.find (addr);
120  if (it != m_qosSequences.end ())
121  {
122  return it->second[tid];
123  }
124  return seq;
125 }
126 
127 void
129 {
130  NS_LOG_FUNCTION (this << *hdr);
131 
132  if (hdr->IsQosData ()
133  && !hdr->GetAddr1 ().IsGroup ())
134  {
135  uint8_t tid = hdr->GetQosTid ();
136  NS_ASSERT (tid < 16);
137  auto it = m_qosSequences.find (hdr->GetAddr1 ());
138  NS_ASSERT (it != m_qosSequences.end ());
139  it->second[tid] = hdr->GetSequenceNumber ();
140  }
141  else
142  {
143  m_sequence = hdr->GetSequenceNumber ();
144  }
145 }
146 
147 } //namespace ns3
an EUI-48 address
Definition: mac48-address.h:44
bool IsGroup(void) const
void SetSequenceNumberFor(const WifiMacHeader *hdr)
Set the sequence number of the given MAC header as the next sequence number for the Traffic ID and de...
uint16_t m_sequence
current sequence number
Definition: mac-tx-middle.h:78
uint16_t GetNextSeqNumberByTidAndAddress(uint8_t tid, Mac48Address addr) const
Return the next sequence number for the Traffic ID and destination.
uint16_t GetNextSequenceNumberFor(const WifiMacHeader *hdr)
Return the next sequence number for the given header.
uint16_t PeekNextSequenceNumberFor(const WifiMacHeader *hdr)
Return the next sequence number for the Traffic ID and destination, but do not pick it (i....
std::map< Mac48Address, uint16_t * > m_qosSequences
QOS sequences.
Definition: mac-tx-middle.h:77
Implements the IEEE 802.11 MAC header.
uint8_t GetQosTid(void) const
Return the Traffic ID of a QoS header.
bool IsQosData(void) const
Return true if the Type is DATA and Subtype is one of the possible values for QoS Data.
uint16_t GetSequenceNumber(void) const
Return the sequence number of the header.
Mac48Address GetAddr1(void) const
Return the address in the Address 1 field.
#define NS_ASSERT(condition)
At runtime, in debugging builds, if this condition is not true, the program prints the source file,...
Definition: assert.h:67
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
Definition: log.h:205
#define NS_LOG_FUNCTION(parameters)
If log level LOG_FUNCTION is enabled, this macro will output all input parameters separated by ",...
Every class exported by the ns3 library is enclosed in the ns3 namespace.