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

/*

 * Copyright (c) 2005,2006 INRIA

 *

 * 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

 *

 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "mac-high-nqap.h"

#include "mac-stations.h"

#include "dca-txop.h"

#include "wifi-net-device.h"

#include "wifi-mac-header.h"

#include "mgt-headers.h"

#include "ns3/assert.h"

#define noNQAP_DEBUG 1

#ifdef NQAP_DEBUG

#include <iostream>

#include "ns3/simulator.h"

#  define TRACE(x) \

std::cout << "NQAP now=" << Simulator::NowUs () << "us " << x << std::endl;

#else

#  define TRACE(x)

#endif

namespace ns3 {

MacHighNqap::MacHighNqap ()

  : m_beaconIntervalUs (500000)

{}

MacHighNqap::~MacHighNqap ()

{}

void 

MacHighNqap::SetDcaTxop (DcaTxop *dca)

{

  m_dca = dca;

  m_dca->SetTxOkCallback (MakeCallback (&MacHighNqap::TxOk, this));

  m_dca->SetTxFailedCallback (MakeCallback (&MacHighNqap::TxFailed, this));

}

void 

MacHighNqap::SetDevice (WifiNetDevice *device)

{

  m_device = device;

}

void 

MacHighNqap::SetStations (MacStations *stations)

{

  m_stations = stations;

}

void 

MacHighNqap::SetForwardCallback (ForwardCallback callback)

{

  m_forwardUp = callback;

}

void 

MacHighNqap::SetBeaconIntervalUs (uint64_t us)

{

  m_beaconIntervalUs = us;

}

void 

MacHighNqap::ForwardDown (Packet packet, Mac48Address from, Mac48Address to)

{

  WifiMacHeader hdr;

  hdr.SetTypeData ();

  hdr.SetAddr1 (to);

  hdr.SetAddr2 (m_device->GetSelfAddress ());

  hdr.SetAddr3 (from);

  hdr.SetDsFrom ();

  hdr.SetDsNotTo ();

  m_dca->Queue (packet, hdr);  

}

void 

MacHighNqap::Queue (Packet packet, Mac48Address to)

{

  ForwardDown (packet, m_device->GetSelfAddress (), to);

}

void

MacHighNqap::SendProbeResp (Mac48Address to)

{

  TRACE ("send probe response to="<<to);

  WifiMacHeader hdr;

  hdr.SetProbeResp ();

  hdr.SetAddr1 (to);

  hdr.SetAddr2 (m_device->GetSelfAddress ());

  hdr.SetAddr3 (m_device->GetSelfAddress ());

  hdr.SetDsNotFrom ();

  hdr.SetDsNotTo ();

  Packet packet;

  MgtProbeResponseHeader probe;

  probe.SetSsid (m_device->GetSsid ());

  probe.SetSupportedRates (rates);

  probe.SetBeaconIntervalUs (m_beaconIntervalUs);

  packet.AddHeader (probe);

  m_dca->Queue (packet, hdr);

}

void

{

  TRACE ("send assoc response to="<<to);

  WifiMacHeader hdr;

  hdr.SetAssocResp ();

  hdr.SetAddr1 (to);

  hdr.SetAddr2 (m_device->GetSelfAddress ());

  hdr.SetAddr3 (m_device->GetSelfAddress ());

  hdr.SetDsNotFrom ();

  hdr.SetDsNotTo ();

  Packet packet;

  MgtAssocResponseHeader assoc;

  StatusCode code;

  assoc.SetStatusCode (code);

  packet.AddHeader (assoc);

  m_dca->Queue (packet, hdr);

}

void 

MacHighNqap::TxOk (WifiMacHeader const &hdr)

{

  MacStation *station = m_stations->Lookup (hdr.GetAddr1 ());

  if (hdr.IsAssocResp () && 

      station->IsWaitAssocTxOk ()) 

    {

      TRACE ("associated with sta="<<hdr.GetAddr1 ());

      station->RecordGotAssocTxOk ();

    }

}

void 

MacHighNqap::TxFailed (WifiMacHeader const &hdr)

{

  MacStation *station = m_stations->Lookup (hdr.GetAddr1 ());

  if (hdr.IsAssocResp () && 

      station->IsWaitAssocTxOk ()) 

    {

      TRACE ("assoc failed with sta="<<hdr.GetAddr1 ());

      station->RecordGotAssocTxFailed ();

    }

}

void 

MacHighNqap::Receive (Packet packet, WifiMacHeader const *hdr)

{

  MacStation *station = m_stations->Lookup (hdr->GetAddr2 ());

  if (hdr->IsData ()) 

    {

      if (!hdr->IsFromDs () && 

          hdr->IsToDs () &&

          hdr->GetAddr1 () == m_device->GetSelfAddress () &&

          station->IsAssociated ()) 

        {

          if (hdr->GetAddr3 () == m_device->GetSelfAddress ()) 

            {

              m_forwardUp (packet, hdr->GetAddr2 ());

            } 

          else 

            {

              ForwardDown (packet,

                           hdr->GetAddr2 (), 

                           hdr->GetAddr3 ());

              m_forwardUp (packet, hdr->GetAddr2 ());

            }

        } 

      else if (hdr->IsFromDs () &&

               hdr->IsToDs ()) 

        {

          // this is an AP-to-AP frame

          // we ignore for now.

        } 

      else 

        {

          // we can ignore these frames since 

          // they are not targeted at the AP

        }

    } 

  else if (hdr->IsMgt ()) 

    {

      if (hdr->IsProbeReq ()) 

        {

          NS_ASSERT (hdr->GetAddr1 ().IsBroadcast ());

          SendProbeResp (hdr->GetAddr2 ());

        } 

      else if (hdr->GetAddr1 () == m_device->GetSelfAddress ()) 

        {

          if (hdr->IsAssocReq ()) 

            {

            } 

          else if (hdr->IsDisassociation ()) 

            {

              station->RecordDisassociated ();

            } 

          else if (hdr->IsReassocReq ()) 

            {

              /* we don't support reassoc frames for now */

            } 

          else if (hdr->IsAuthentication () ||

                   hdr->IsDeauthentication ()) 

            {

              /*

               */

            } 

          else 

            {

              /* unknown mgt frame

               */

            }

        }

    } 

  else 

    {

    /* damn, what could this be ? a control frame ?

     * control frames should never reach the MacHigh so,

     * this is likely to be a bug. assert.

     */

      NS_ASSERT (false);

    }  

}

} // namespace ns3