satellite-llc.cc

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013 Magister Solutions Ltd
 *
 * 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: Jani Puttonen <jani.puttonen@magister.fi>
 */
 
#include "satellite-llc.h"
 
#include "satellite-control-message.h"
#include "satellite-enums.h"
#include "satellite-node-info.h"
#include "satellite-queue.h"
#include "satellite-scheduling-object.h"
#include "satellite-time-tag.h"
#include "satellite-topology.h"
#include "satellite-typedefs.h"
#include "satellite-utils.h"
 
#include "ns3/log.h"
#include "ns3/nstime.h"
#include "ns3/simulator.h"
#include "ns3/singleton.h"
 
#include <utility>
 
NS_LOG_COMPONENT_DEFINE("SatLlc");
 
namespace ns3
{
 
NS_OBJECT_ENSURE_REGISTERED(SatLlc);
 
TypeId
SatLlc::GetTypeId(void)
{
    static TypeId tid = TypeId("ns3::SatLlc")
                            .SetParent<Object>()
                            .AddAttribute("FwdLinkArqEnabled",
                                          "Enable ARQ in forward link.",
                                          BooleanValue(false),
                                          MakeBooleanAccessor(&SatLlc::m_fwdLinkArqEnabled),
                                          MakeBooleanChecker())
                            .AddAttribute("RtnLinkArqEnabled",
                                          "Enable ARQ in return link.",
                                          BooleanValue(false),
                                          MakeBooleanAccessor(&SatLlc::m_rtnLinkArqEnabled),
                                          MakeBooleanChecker())
                            .AddTraceSource("PacketTrace",
                                            "Packet event trace",
                                            MakeTraceSourceAccessor(&SatLlc::m_packetTrace),
                                            "ns3::PacketTraceCallback");
    return tid;
}
 
SatLlc::SatLlc()
    : m_nodeInfo(),
      m_encaps(),
      m_decaps(),
      m_fwdLinkArqEnabled(false),
      m_rtnLinkArqEnabled(false),
      m_gwAddress(),
      m_satelliteAddress(),
      m_additionalHeaderSize(0),
      m_forwardLinkRegenerationMode(
          Singleton<SatTopology>::Get()->GetForwardLinkRegenerationMode()),
      m_returnLinkRegenerationMode(Singleton<SatTopology>::Get()->GetReturnLinkRegenerationMode())
{
    NS_LOG_FUNCTION(this);
}
 
SatLlc::~SatLlc()
{
    NS_LOG_FUNCTION(this);
}
 
void
SatLlc::DoDispose()
{
    NS_LOG_FUNCTION(this);
    m_rxCallback.Nullify();
 
    EncapContainer_t::iterator it;
 
    for (it = m_encaps.begin(); it != m_encaps.end(); ++it)
    {
        it->second->DoDispose();
        it->second = 0;
    }
    m_encaps.clear();
 
    for (it = m_decaps.begin(); it != m_decaps.end(); ++it)
    {
        it->second->DoDispose();
        it->second = 0;
    }
    m_decaps.clear();
 
    Object::DoDispose();
}
 
bool
SatLlc::Enque(Ptr<Packet> packet, Address dest, uint8_t flowId)
{
    NS_LOG_FUNCTION(this << packet << dest << (uint32_t)flowId);
    NS_LOG_INFO("p=" << packet);
    NS_LOG_INFO("dest=" << dest);
    NS_LOG_INFO("UID is " << packet->GetUid());
 
    Ptr<EncapKey> key = Create<EncapKey>(m_nodeInfo->GetMacAddress(),
                                         Mac48Address::ConvertFrom(dest),
                                         flowId,
                                         m_nodeInfo->GetMacAddress(),
                                         Mac48Address::ConvertFrom(dest));
 
    EncapContainer_t::iterator it = m_encaps.find(key);
 
    if (it == m_encaps.end())
    {
        CreateEncap(key);
        it = m_encaps.find(key);
    }
 
    // Store packet arrival time
    SatTimeTag timeTag(Simulator::Now());
    packet->AddPacketTag(timeTag);
 
    // Add E2E address tag to identify the packet in lower layers
    SatAddressE2ETag addressE2ETag;
    addressE2ETag.SetE2EDestAddress(Mac48Address::ConvertFrom(dest));
    addressE2ETag.SetE2ESourceAddress(m_nodeInfo->GetMacAddress());
    packet->AddPacketTag(addressE2ETag);
 
    it->second->EnquePdu(packet, Mac48Address::ConvertFrom(dest));
 
    SatEnums::SatLinkDir_t ld = GetSatLinkTxDir();
 
    // Add packet trace entry:
    m_packetTrace(Simulator::Now(),
                  SatEnums::PACKET_ENQUE,
                  m_nodeInfo->GetNodeType(),
                  m_nodeInfo->GetNodeId(),
                  m_nodeInfo->GetMacAddress(),
                  SatEnums::LL_LLC,
                  ld,
                  SatUtils::GetPacketInfo(packet));
 
    return true;
}
 
void
SatLlc::Receive(Ptr<Packet> packet, Mac48Address source, Mac48Address dest)
{
    NS_LOG_FUNCTION(this << source << dest << packet);
 
    SatEnums::SatLinkDir_t ld = GetSatLinkRxDir();
 
    // Add packet trace entry:
    m_packetTrace(Simulator::Now(),
                  SatEnums::PACKET_RECV,
                  m_nodeInfo->GetNodeType(),
                  m_nodeInfo->GetNodeId(),
                  m_nodeInfo->GetMacAddress(),
                  SatEnums::LL_LLC,
                  ld,
                  SatUtils::GetPacketInfo(packet));
 
    // Receive packet with a decapsulator instance which is handling the
    // packets for this specific id
    SatFlowIdTag flowIdTag;
    bool mSuccess = packet->PeekPacketTag(flowIdTag);
    if (mSuccess)
    {
        uint32_t flowId = flowIdTag.GetFlowId();
        Ptr<EncapKey> key = Create<EncapKey>(source, dest, flowId);
        EncapContainer_t::iterator it = m_decaps.find(key);
 
        // Control messages not received by this method
        if (flowId == SatEnums::CONTROL_FID && m_nodeInfo->GetNodeType() != SatEnums::NT_SAT)
        {
            NS_FATAL_ERROR("Control messages should not be received by SatLlc::Receive () method!");
        }
 
        if (it == m_decaps.end())
        {
            CreateDecap(key);
            it = m_decaps.find(key);
        }
 
        it->second->ReceivePdu(packet);
    }
}
 
void
SatLlc::ReceiveAck(Ptr<SatArqAckMessage> ack, Mac48Address source, Mac48Address dest)
{
    NS_LOG_FUNCTION(this << source << dest);

    uint32_t flowId = ack->GetFlowId();
 
    Ptr<EncapKey> key = Create<EncapKey>(dest, source, flowId);
    EncapContainer_t::iterator it = m_encaps.find(key);
 
    if (it != m_encaps.end())
    {
        it->second->ReceiveAck(ack);
    }
    else
    {
        NS_FATAL_ERROR("Encapsulator not found for key (" << source << ", " << dest << ", "
                                                          << (uint32_t)flowId << ")");
    }
}
 
SatEnums::SatLinkDir_t
SatLlc::GetSatLinkTxDir()
{
    return SatEnums::LD_UNDEFINED;
}
 
SatEnums::SatLinkDir_t
SatLlc::GetSatLinkRxDir()
{
    return SatEnums::LD_UNDEFINED;
}
 
void
SatLlc::ReceiveHigherLayerPdu(Ptr<Packet> packet, Mac48Address source, Mac48Address dest)
{
    NS_LOG_FUNCTION(this << packet << source << dest);
 
    // Remove time tag
    SatTimeTag timeTag;
    packet->RemovePacketTag(timeTag);
 
    // Remove control msg tag
    SatControlMsgTag ctrlTag;
    bool cSuccess = packet->RemovePacketTag(ctrlTag);
 
    if (cSuccess)
    {
        if (ctrlTag.GetMsgType() != SatControlMsgTag::SAT_ARQ_ACK)
        {
            NS_FATAL_ERROR("A control message other than ARQ ACK received at the LLC!");
        }
 
        // ARQ ACKs need to be forwarded to LLC/ARQ for processing
        uint32_t ackId = ctrlTag.GetMsgId();
 
        Ptr<SatArqAckMessage> ack = DynamicCast<SatArqAckMessage>(m_readCtrlCallback(ackId));
 
        if (ack == nullptr)
        {
            NS_FATAL_ERROR(
                "ARQ ACK not found, check that control msg storage time is set long enough!");
        }
 
        ReceiveAck(ack, source, dest);
    }
    // Higher layer packet
    else
    {
        // Call a callback to receive the packet at upper layer
 
        // Remove SatAddressE2ETag
        SatAddressE2ETag addressE2ETag;
        packet->RemovePacketTag(addressE2ETag);
 
        m_rxCallback(packet);
    }
}
 
void
SatLlc::AddEncap(Mac48Address source,
                 Mac48Address dest,
                 uint8_t flowId,
                 Ptr<SatBaseEncapsulator> enc)
{
    NS_LOG_FUNCTION(this << source << dest << (uint32_t)flowId);
 
    Ptr<EncapKey> key = Create<EncapKey>(source, dest, flowId);
    EncapContainer_t::iterator it = m_encaps.find(key);
 
    if (it == m_encaps.end())
    {
        NS_LOG_INFO("Add encapsulator with key (" << source << ", " << dest << ", "
                                                  << (uint32_t)flowId << ")");
 
        std::pair<EncapContainer_t::iterator, bool> result =
            m_encaps.insert(std::make_pair(key, enc));
        if (result.second == false)
        {
            NS_FATAL_ERROR("Insert to map with key (" << source << ", " << dest << ", "
                                                      << (uint32_t)flowId << ") failed!");
        }
    }
    else
    {
        NS_FATAL_ERROR("Encapsulator container already holds key ("
                       << source << ", " << dest << ", " << (uint32_t)flowId << ") key!");
    }
}
 
void
SatLlc::AddDecap(Mac48Address source,
                 Mac48Address dest,
                 uint8_t flowId,
                 Ptr<SatBaseEncapsulator> dec)
{
    NS_LOG_FUNCTION(this << source << dest << (uint32_t)flowId);
 
    Ptr<EncapKey> key = Create<EncapKey>(source, dest, flowId);
    EncapContainer_t::iterator it = m_decaps.find(key);
 
    if (it == m_decaps.end())
    {
        NS_LOG_INFO("Add Decapsulator with key (" << source << ", " << dest << ", "
                                                  << (uint32_t)flowId << ")");
 
        std::pair<EncapContainer_t::iterator, bool> result =
            m_decaps.insert(std::make_pair(key, dec));
        if (result.second == false)
        {
            NS_FATAL_ERROR("Insert to map with key (" << source << ", " << dest << ", "
                                                      << (uint32_t)flowId << ") failed!");
        }
    }
    else
    {
        NS_FATAL_ERROR("Decapsulator container already holds (" << source << ", " << dest << ", "
                                                                << (uint32_t)flowId << ") key!");
    }
}
 
void
SatLlc::SetNodeInfo(Ptr<SatNodeInfo> nodeInfo)
{
    NS_LOG_FUNCTION(this << nodeInfo);
    m_nodeInfo = nodeInfo;
}
 
void
SatLlc::SetReceiveCallback(SatLlc::ReceiveCallback cb)
{
    NS_LOG_FUNCTION(this << &cb);
    m_rxCallback = cb;
}
 
bool
SatLlc::BuffersEmpty() const
{
    for (EncapContainer_t::const_iterator it = m_encaps.begin(); it != m_encaps.end(); ++it)
    {
        if (it->second->GetTxBufferSizeInBytes() > 0)
        {
            return false;
        }
    }
    return true;
}
 
bool
SatLlc::ControlBuffersEmpty() const
{
    for (EncapContainer_t::const_iterator it = m_encaps.begin(); it != m_encaps.end(); ++it)
    {
        if (it->first->m_flowId == SatEnums::CONTROL_FID)
        {
            if (it->second->GetTxBufferSizeInBytes() > 0)
            {
                return false;
            }
        }
    }
    return true;
}
 
uint32_t
SatLlc::GetNBytesInQueue() const
{
    NS_LOG_FUNCTION(this);
 
    uint32_t sum = 0;
 
    for (EncapContainer_t::const_iterator it = m_encaps.begin(); it != m_encaps.end(); ++it)
    {
        NS_ASSERT(it->second != nullptr);
        Ptr<SatQueue> queue = it->second->GetQueue();
        NS_ASSERT(queue != nullptr);
        sum += queue->GetNBytes();
    }
 
    return sum;
}
 
uint32_t
SatLlc::GetNPacketsInQueue() const
{
    NS_LOG_FUNCTION(this);
 
    uint32_t sum = 0;
 
    for (EncapContainer_t::const_iterator it = m_encaps.begin(); it != m_encaps.end(); ++it)
    {
        NS_ASSERT(it->second != nullptr);
        Ptr<SatQueue> queue = it->second->GetQueue();
        NS_ASSERT(queue != nullptr);
        sum += queue->GetNPackets();
    }
 
    return sum;
}
 
void
SatLlc::SetReadCtrlCallback(SatLlc::ReadCtrlMsgCallback cb)
{
    NS_LOG_FUNCTION(this << &cb);
    m_readCtrlCallback = cb;
}
 
void
SatLlc::SetCtrlMsgCallback(SatBaseEncapsulator::SendCtrlCallback cb)
{
    NS_LOG_FUNCTION(this << &cb);
 
    m_sendCtrlCallback = cb;
}
 
void
SatLlc::SetGwAddress(Mac48Address address)
{
    NS_LOG_FUNCTION(this << address);
    m_gwAddress = address;
}
 
void
SatLlc::SetSatelliteAddress(Mac48Address address)
{
    NS_LOG_FUNCTION(this << address);
    m_satelliteAddress = address;
}
 
void
SatLlc::SetAdditionalHeaderSize(uint32_t additionalHeaderSize)
{
    NS_LOG_FUNCTION(this << additionalHeaderSize);
    m_additionalHeaderSize = additionalHeaderSize;
}
 
} // namespace ns3