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/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2011 CTTC
* Copyright (c) 2010 TELEMATICS LAB, DEE - Politecnico di Bari
* Copyright (c) 2017 Irt Systemx and/or its affiliates.
*
* 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:
* Nicola Baldo <nbaldo@cttc.es> (the EpcTftClassifier class)
* Giuseppe Piro <g.piro@poliba.it> (part of the code in EpcTftClassifier::Classify ()
* which comes from RrcEntity::Classify of the GSoC 2010 LTE module)
*
*/
#include "epc-tft-classifier.h"
#include "epc-tft.h"
#include "ns3/log.h"
#include "ns3/packet.h"
#include "ns3/ipv4-header.h"
#include "ns3/udp-header.h"
#include "ns3/tcp-header.h"
#include "ns3/udp-l4-protocol.h"
#include "ns3/tcp-l4-protocol.h"
#ifndef PING_ENABLED
#define PING_ENABLED 1
#endif
#ifdef PING_ENABLED
#include "ns3/icmpv4-l4-protocol.h"
#endif
namespace ns3 {
NS_LOG_COMPONENT_DEFINE ("EpcTftClassifier");
EpcTftClassifier::EpcTftClassifier ()
{
NS_LOG_FUNCTION (this);
}
void
EpcTftClassifier::Add (Ptr<EpcTft> tft, uint32_t id)
{
NS_LOG_FUNCTION (this << tft);
m_tftMap[id] = tft;
// simple sanity check: there shouldn't be more than 16 bearers (hence TFTs) per UE
NS_ASSERT (m_tftMap.size () <= 16);
}
void
EpcTftClassifier::Delete (uint32_t id)
{
NS_LOG_FUNCTION (this << id);
m_tftMap.erase (id);
}
uint32_t
EpcTftClassifier::Classify (Ptr<Packet> p, EpcTft::Direction direction)
{
NS_LOG_FUNCTION (this << p << direction);
Ptr<Packet> pCopy = p->Copy ();
Ipv4Header ipv4Header;
pCopy->RemoveHeader (ipv4Header);
Ipv4Address localAddress;
Ipv4Address remoteAddress;
if (direction == EpcTft::UPLINK)
{
localAddress = ipv4Header.GetSource ();
remoteAddress = ipv4Header.GetDestination ();
}
else
{
NS_ASSERT (direction == EpcTft::DOWNLINK);
remoteAddress = ipv4Header.GetSource ();
localAddress = ipv4Header.GetDestination ();
}
uint8_t protocol = ipv4Header.GetProtocol ();
uint8_t tos = ipv4Header.GetTos ();
uint16_t localPort = 0;
uint16_t remotePort = 0;
if (protocol == UdpL4Protocol::PROT_NUMBER)
{
UdpHeader udpHeader;
pCopy->RemoveHeader (udpHeader);
if (direction == EpcTft::UPLINK)
{
localPort = udpHeader.GetSourcePort ();
remotePort = udpHeader.GetDestinationPort ();
}
else
{
remotePort = udpHeader.GetSourcePort ();
localPort = udpHeader.GetDestinationPort ();
}
}
else if (protocol == TcpL4Protocol::PROT_NUMBER)
{
TcpHeader tcpHeader;
pCopy->RemoveHeader (tcpHeader);
if (direction == EpcTft::UPLINK)
{
localPort = tcpHeader.GetSourcePort ();
remotePort = tcpHeader.GetDestinationPort ();
}
else
{
remotePort = tcpHeader.GetSourcePort ();
localPort = tcpHeader.GetDestinationPort ();
}
}
#ifdef PING_ENABLED
else if (protocol == Icmpv4L4Protocol::PROT_NUMBER) //for ICMP(ping, and etc) protocol, use the default bearer always, added by zeng
{
NS_LOG_DEBUG("ICMP protocol, like ping is assigned the default bearer");
remotePort=0;
localPort=0;
}
#endif
else
{
NS_LOG_INFO ("Unknown protocol: " << protocol);
return 0; // no match
}
NS_LOG_INFO ("Classifing packet:"
<< " localAddr=" << localAddress
<< " remoteAddr=" << remoteAddress
<< " localPort=" << localPort
<< " remotePort=" << remotePort
<< " tos=0x" << (uint16_t) tos );
// now it is possible to classify the packet!
// we use a reverse iterator since filter priority is not implemented properly.
// This way, since the default bearer is expected to be added first, it will be evaluated last.
std::map <uint32_t, Ptr<EpcTft> >::const_reverse_iterator it;
NS_LOG_LOGIC ("TFT MAP size: " << m_tftMap.size ());
for (it = m_tftMap.rbegin (); it != m_tftMap.rend (); ++it)
{
NS_LOG_LOGIC ("TFT id: " << it->first );
NS_LOG_LOGIC (" Ptr<EpcTft>: " << it->second);
Ptr<EpcTft> tft = it->second;
if (tft->Matches (direction, remoteAddress, localAddress, remotePort, localPort, tos))
{
NS_LOG_LOGIC ("matches with TFT ID = " << it->first);
return it->first; // the id of the matching TFT
}
}
NS_LOG_LOGIC ("no match");
return 0; // no match
}
} // namespace ns3
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