* Copyright (c) 2006, 2009 INRIA

 * Copyright (c) 2009 MIRKO BANCHI

 * it under the terms of the GNU General Public License version 2 as

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

#include "ns3/pointer.h"

#include "ns3/log.h"

#include "ns3/string.h"

#include "ns3/boolean.h"

#include "ns3/trace-source-accessor.h"

#include "qos-tag.h"

#include "dcf-manager.h"

#include "mac-tx-middle.h"

#include "msdu-aggregator.h"

#include "amsdu-subframe-header.h"

#include "mgt-headers.h"

TypeId

    .SetParent<RegularWifiMac> ()

  NS_LOG_FUNCTION (this);

  // Let the lower layers know that we are acting in an IBSS

  SetTypeOfStation (ADHOC_STA);

  NS_LOG_FUNCTION (this);

void

  // In an IBSS, the BSSID is supposed to be generated per Section

  // 11.1.3 of IEEE 802.11. We don't currently do this - instead we

  // make an IBSS STA a bit like an AP, with the BSSID for frames

  // transmitted by each STA set to that STA's address.

  //

  // This is why we're overriding this method.

  RegularWifiMac::SetAddress (address);

  RegularWifiMac::SetBssid (address);

void

  NS_LOG_FUNCTION (this << packet << to);

      // In ad hoc mode, we assume that every destination supports all

      // the rates we support.

  WifiMacHeader hdr;

  // If we are not a QoS STA then we definitely want to use AC_BE to

  // transmit the packet. A TID of zero will map to AC_BE (through \c

  // QosUtilsMapTidToAc()), so we use that as our default here.

  uint8_t tid = 0;

  // For now, a STA that supports QoS does not support non-QoS

  // associations, and vice versa. In future the STA model should fall

  // back to non-QoS if talking to a peer that is also non-QoS. At

  // that point there will need to be per-station QoS state maintained

  // by the association state machine, and consulted here.

  if (m_qosSupported)

    {

      hdr.SetType (WIFI_MAC_QOSDATA);

      hdr.SetQosAckPolicy (WifiMacHeader::NORMAL_ACK);

      hdr.SetQosNoEosp ();

      hdr.SetQosNoAmsdu ();

      // Transmission of multiple frames in the same TXOP is not

      // supported for now

      hdr.SetQosTxopLimit (0);

      // Fill in the QoS control field in the MAC header

      tid = QosUtilsGetTidForPacket (packet);

      // Any value greater than 7 is invalid and likely indicates that

      // the packet had no QoS tag, so we revert to zero, which'll

      // mean that AC_BE is used.

      if (tid >= 7)

        {

          tid = 0;

        }

      hdr.SetQosTid (tid);

    }

  else

    {

      hdr.SetTypeData ();

    }

  hdr.SetAddr1 (to);

  hdr.SetAddr2 (m_low->GetAddress ());

  hdr.SetAddr3 (GetBssid ());

  hdr.SetDsNotFrom ();

  hdr.SetDsNotTo ();

  if (m_qosSupported)

    {

      // Sanity check that the TID is valid

      NS_ASSERT (tid < 8);

      m_edca[QosUtilsMapTidToAc (tid)]->Queue (packet, hdr);

    }

  else

    {

      m_dca->Queue (packet, hdr);

    }

void

AdhocWifiMac::SetLinkUpCallback (Callback<void> linkUp)

  NS_LOG_FUNCTION (this);

  RegularWifiMac::SetLinkUpCallback (linkUp);

  // The approach taken here is that, from the point of view of a STA

  // in IBSS mode, the link is always up, so we immediately invoke the

  // callback if one is set

  linkUp ();

}

void

AdhocWifiMac::Receive (Ptr<Packet> packet, const WifiMacHeader *hdr)

{

  NS_LOG_FUNCTION (this << packet << hdr);

  NS_ASSERT (!hdr->IsCtl ());

  Mac48Address from = hdr->GetAddr2 ();

  Mac48Address to = hdr->GetAddr1 ();

  if (hdr->IsData ())

      if (hdr->IsQosData () && hdr->IsQosAmsdu ())

        {

          NS_LOG_DEBUG ("Received A-MSDU from"<<from);

          DeaggregateAmsduAndForward (packet, hdr);

        }

      else

        {

          ForwardUp (packet, from, to);

        }

      return;

  // Invoke the receive handler of our parent class to deal with any

  // other frames. Specifically, this will handle Block Ack-related

  // Management Action frames.

  RegularWifiMac::Receive (packet, hdr);