A Discrete-Event Network Simulator
API
mpdu-aggregator.cc
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2013
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation;
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11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
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15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17  *
18  * Author: Ghada Badawy <gbadawy@gmail.com>
19  */
20 #include "ns3/log.h"
21 
22 #include "mpdu-aggregator.h"
23 #include "wifi-mac-header.h"
24 
25 NS_LOG_COMPONENT_DEFINE ("MpduAggregator");
26 
27 namespace ns3 {
28 
29 NS_OBJECT_ENSURE_REGISTERED (MpduAggregator);
30 
31 TypeId
32 MpduAggregator::GetTypeId (void)
33 {
34  static TypeId tid = TypeId ("ns3::MpduAggregator")
35  .SetGroupName ("Wifi")
36  .SetParent<Object> ()
37  ;
38  return tid;
39 }
40 
41 MpduAggregator::DeaggregatedMpdus
42 MpduAggregator::Deaggregate (Ptr<Packet> aggregatedPacket)
43 {
44  NS_LOG_FUNCTION_NOARGS ();
45  DeaggregatedMpdus set;
46 
47  AmpduSubframeHeader hdr;
48  Ptr<Packet> extractedMpdu = Create<Packet> ();
49  uint32_t maxSize = aggregatedPacket->GetSize ();
50  uint16_t extractedLength;
51  uint32_t padding;
52  uint32_t deserialized = 0;
53 
54  while (deserialized < maxSize)
55  {
56  deserialized += aggregatedPacket->RemoveHeader (hdr);
57  extractedLength = hdr.GetLength ();
58  extractedMpdu = aggregatedPacket->CreateFragment (0, static_cast<uint32_t> (extractedLength));
59  aggregatedPacket->RemoveAtStart (extractedLength);
60  deserialized += extractedLength;
61 
62  padding = (4 - (extractedLength % 4 )) % 4;
63 
64  if (padding > 0 && deserialized < maxSize)
65  {
66  aggregatedPacket->RemoveAtStart (padding);
67  deserialized += padding;
68  }
69 
70  std::pair<Ptr<Packet>, AmpduSubframeHeader> packetHdr (extractedMpdu, hdr);
71  set.push_back (packetHdr);
72  }
73  NS_LOG_INFO ("Deaggreated A-MPDU: extracted " << set.size () << " MPDUs");
74  return set;
75 }
76 
77 
78 } // namespace ns3
ns3::AmpduSubframeHeader::GetLength
uint16_t GetLength(void) const
Return the length field.
Definition: ampdu-subframe-header.cc:114
ns3::Packet::RemoveHeader
uint32_t RemoveHeader(Header &header)
Deserialize and remove the header from the internal buffer.
Definition: packet.cc:268
NS_OBJECT_ENSURE_REGISTERED
#define NS_OBJECT_ENSURE_REGISTERED(type)
Register an Object subclass with the TypeId system.
Definition: object-base.h:44
NS_LOG_COMPONENT_DEFINE
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
Definition: log.h:201
ns3::Packet::GetSize
uint32_t GetSize(void) const
Returns the the size in bytes of the packet (including the zero-filled initial payload).
Definition: packet.h:766
ns3::MpduAggregator::Deaggregate
static DeaggregatedMpdus Deaggregate(Ptr< Packet > aggregatedPacket)
Deaggregates an A-MPDU by removing the A-MPDU subframe header and padding.
Definition: mpdu-aggregator.cc:42
NS_LOG_INFO
#define NS_LOG_INFO(msg)
Use NS_LOG to output a message of level LOG_INFO.
Definition: log.h:244
NS_LOG_FUNCTION_NOARGS
#define NS_LOG_FUNCTION_NOARGS()
Output the name of the function.
Definition: log-macros-enabled.h:176
ns3::Packet::CreateFragment
Ptr< Packet > CreateFragment(uint32_t start, uint32_t length) const
Create a new packet which contains a fragment of the original packet.
Definition: packet.cc:228
ns3::Packet::RemoveAtStart
void RemoveAtStart(uint32_t size)
Remove size bytes from the start of the current packet.
Definition: packet.cc:353
ns3::AmpduSubframeHeader
Introspection did not find any typical Config paths.
Definition: ampdu-subframe-header.h:33
ns3::TypeId::SetGroupName
TypeId SetGroupName(std::string groupName)
Definition: type-id.cc:645
ns3
Every class exported by the ns3 library is enclosed in the ns3 namespace.
ns3::MpduAggregator::GetTypeId
static TypeId GetTypeId(void)
Definition: mpdu-aggregator.cc:32
ns3::MpduAggregator::DeaggregatedMpdus
std::list< std::pair< Ptr< Packet >, AmpduSubframeHeader > > DeaggregatedMpdus
A list of deaggregated packets and their A-MPDU subframe headers.
Definition: mpdu-aggregator.h:45
ns3::Object
A base class which provides memory management and object aggregation.
Definition: object.h:87
ns3::TypeId
a unique identifier for an interface.
Definition: type-id.h:57
ns3::TypeId::SetParent
TypeId SetParent(TypeId tid)
Definition: type-id.cc:638