mac-tx-middle.cc

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/*
 * Copyright (c) 2005, 2009 INRIA
 * Copyright (c) 2009 MIRKO BANCHI
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Authors: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 *          Mirko Banchi <mk.banchi@gmail.com>
 *          Ghada Badawy <gbadawy@gmail.com>
 */
 
#include "mac-tx-middle.h"
 
#include "wifi-mac-header.h"
 
#include "ns3/log.h"
 
namespace ns3
{
 
NS_LOG_COMPONENT_DEFINE("MacTxMiddle");
 
MacTxMiddle::MacTxMiddle()
    : m_sequence(0)
{
    NS_LOG_FUNCTION(this);
}
 
MacTxMiddle::~MacTxMiddle()
{
    NS_LOG_FUNCTION(this);
    for (std::map<Mac48Address, uint16_t*>::const_iterator i = m_qosSequences.begin();
         i != m_qosSequences.end();
         i++)
    {
        delete[] i->second;
    }
}
 
uint16_t
MacTxMiddle::GetNextSequenceNumberFor(const WifiMacHeader* hdr)
{
    NS_LOG_FUNCTION(this);
    uint16_t retval;
    if (hdr->IsQosData() && !hdr->GetAddr1().IsGroup())
    {
        uint8_t tid = hdr->GetQosTid();
        NS_ASSERT(tid < 16);
        std::map<Mac48Address, uint16_t*>::const_iterator it = m_qosSequences.find(hdr->GetAddr1());
        if (it != m_qosSequences.end())
        {
            retval = it->second[tid];
            it->second[tid]++;
            it->second[tid] %= 4096;
        }
        else
        {
            retval = 0;
            std::pair<Mac48Address, uint16_t*> newSeq(hdr->GetAddr1(), new uint16_t[16]);
            std::pair<std::map<Mac48Address, uint16_t*>::const_iterator, bool> newIns =
                m_qosSequences.insert(newSeq);
            NS_ASSERT(newIns.second == true);
            for (uint8_t i = 0; i < 16; i++)
            {
                newIns.first->second[i] = 0;
            }
            newIns.first->second[tid]++;
        }
    }
    else
    {
        retval = m_sequence;
        m_sequence++;
        m_sequence %= 4096;
    }
    return retval;
}
 
uint16_t
MacTxMiddle::PeekNextSequenceNumberFor(const WifiMacHeader* hdr)
{
    NS_LOG_FUNCTION(this);
    uint16_t retval;
    if (hdr->IsQosData() && !hdr->GetAddr1().IsGroup())
    {
        uint8_t tid = hdr->GetQosTid();
        NS_ASSERT(tid < 16);
        std::map<Mac48Address, uint16_t*>::const_iterator it = m_qosSequences.find(hdr->GetAddr1());
        if (it != m_qosSequences.end())
        {
            retval = it->second[tid];
        }
        else
        {
            retval = 0;
        }
    }
    else
    {
        retval = m_sequence;
    }
    return retval;
}
 
uint16_t
MacTxMiddle::GetNextSeqNumberByTidAndAddress(uint8_t tid, Mac48Address addr) const
{
    NS_LOG_FUNCTION(this);
    NS_ASSERT(tid < 16);
    uint16_t seq = 0;
    std::map<Mac48Address, uint16_t*>::const_iterator it = m_qosSequences.find(addr);
    if (it != m_qosSequences.end())
    {
        return it->second[tid];
    }
    return seq;
}
 
void
MacTxMiddle::SetSequenceNumberFor(const WifiMacHeader* hdr)
{
    NS_LOG_FUNCTION(this << *hdr);
 
    if (hdr->IsQosData() && !hdr->GetAddr1().IsGroup())
    {
        uint8_t tid = hdr->GetQosTid();
        NS_ASSERT(tid < 16);
        auto it = m_qosSequences.find(hdr->GetAddr1());
        NS_ASSERT(it != m_qosSequences.end());
        it->second[tid] = hdr->GetSequenceNumber();
    }
    else
    {
        m_sequence = hdr->GetSequenceNumber();
    }
}
 
} // namespace ns3