1 /* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

     2 /*

     3  * Copyright (c) 2009 MIRKO BANCHI

     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;

     8  *

     9  * This program is distributed in the hope that it will be useful,

    10  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    12  * GNU General Public License for more details.

    13  *

    14  * You should have received a copy of the GNU General Public License

    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: Mirko Banchi <mk.banchi@gmail.com>

    19  */

    20 #include "ns3/log.h"

    21 #include "ns3/uinteger.h"

    22 

    23 #include "amsdu-subframe-header.h"

    24 #include "msdu-standard-aggregator.h"

    25 

    26 NS_LOG_COMPONENT_DEFINE ("MsduStandardAggregator");

    27 

    28 namespace ns3 {

    29 

    30 NS_OBJECT_ENSURE_REGISTERED (MsduStandardAggregator);

    31 

    32 TypeId

    33 MsduStandardAggregator::GetTypeId (void)

    34 {

    35   static TypeId tid = TypeId ("ns3::MsduStandardAggregator")

    36     .SetParent<MsduAggregator> ()

    37     .AddConstructor<MsduStandardAggregator> ()

    38     .AddAttribute ("MaxAmsduSize", "Max length in byte of an A-MSDU",

    39                    UintegerValue (7935),

    40                    MakeUintegerAccessor (&MsduStandardAggregator::m_maxAmsduLength),

    41                    MakeUintegerChecker<uint32_t> ())

    42     ;

    43   return tid;

    44 }

    45 

    46 MsduStandardAggregator::MsduStandardAggregator () 

    47 {}

    48 

    49 MsduStandardAggregator::~MsduStandardAggregator ()

    50 {}

    51 

    52 bool

    53 MsduStandardAggregator::Aggregate (Ptr<const Packet> packet, Ptr<Packet> aggregatedPacket,

    54                                    Mac48Address src, Mac48Address dest)

    55 {

    56   NS_LOG_FUNCTION (this);

    57   Ptr<Packet> currentPacket;

    58   AmsduSubframeHeader currentHdr;

    59 

    60   uint32_t padding = CalculatePadding (packet);

    61   uint32_t actualSize = aggregatedPacket->GetSize ();

    62                           

    63   if ((14 + packet->GetSize () + actualSize + padding) <= m_maxAmsduLength)

    64     {

    65       currentHdr.SetDestinationAddr (dest);

    66       currentHdr.SetSourceAddr (src);

    67       currentHdr.SetLength (packet->GetSize ());

    68       currentPacket = packet->Copy ();

    69       if (padding)

    70         {

    71           currentPacket->AddPaddingAtEnd (padding);

    72         }

    73       currentPacket->AddHeader (currentHdr);

    74       aggregatedPacket->AddAtEnd (currentPacket);

    75       return true;

    76     }

    77   return false;

    78 }

    79 

    80 uint32_t

    81 MsduStandardAggregator::CalculatePadding (Ptr<const Packet> packet)

    82 {

    83   return (4 - ((packet->GetSize() + 14) %4 )) % 4;

    84 }

    85 

    86 }  //namespace ns3