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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "lte-tap-ue-net-device.h"
#include <ns3/llc-snap-header.h>
#include <ns3/simulator.h>
#include <ns3/callback.h>
#include <ns3/node.h>
#include <ns3/packet.h>
#include <ns3/lte-net-device.h>
#include <ns3/packet-burst.h>
#include <ns3/uinteger.h>
#include <ns3/trace-source-accessor.h>
#include <ns3/pointer.h>
#include <ns3/enum.h>
#include <ns3/lte-amc.h>
#include <ns3/ipv4-header.h>
#include <ns3/lte-radio-bearer-tag.h>
#include <ns3/ipv4-l3-protocol.h>
#include <ns3/log.h>
//NOTE: this is used to handle the arp request. actually this is an hack
#include <ns3/arp-l3-protocol.h>
#include <ns3/arp-header.h>
#include <ns3/lte-enb-net-device.h>
/**
* \brief LteTapUeNetDevice class extends lteUeNetDevice class to support emulation of lte channel
*/
namespace ns3 {
NS_LOG_COMPONENT_DEFINE ("LteTapUeNetDevice");
NS_OBJECT_ENSURE_REGISTERED ( LteTapUeNetDevice);
////////////////////////////////
// LteTapUeNetDevice
////////////////////////////////
TypeId LteTapUeNetDevice::GetTypeId (void)
{
static TypeId
tid =
TypeId ("ns3::LteTapUeNetDevice")
.SetParent<LteUeNetDevice> ()
.AddConstructor<LteTapUeNetDevice>()
;
return tid;
}
LteTapUeNetDevice::LteTapUeNetDevice()
: m_virtualAddress(Mac48Address::Allocate())
{
}
void
LteTapUeNetDevice::SetPromiscReceiveCallback (PromiscReceiveCallback cb)
{
NS_LOG_FUNCTION (this);
// NS_LOG_WARN ("Promisc mode not supported");
/** NOTE: set the promisc callback to be compatable with tap bridge
*/
m_promiscRx = cb;
}
void
LteTapUeNetDevice::Receive (Ptr<Packet> p)
{
NS_LOG_FUNCTION (this << p);
m_rxCallback (this, p, Ipv4L3Protocol::PROT_NUMBER, Address ());
/** NOTE: added for comptabability with tapbridge
*/
if (!m_promiscRx.IsNull ())
{
Mac48Address from = Mac48Address::ConvertFrom (GetAddress());
Mac48Address to = m_vmMacAdress;
enum NetDevice::PacketType type = NetDevice::PACKET_HOST;
m_promiscRx (this, p, Ipv4L3Protocol::PROT_NUMBER, from, to, type);
}
}
bool
LteTapUeNetDevice::Send (Ptr<Packet> packet, const Address& dest, uint16_t protocolNumber)
{
NS_LOG_FUNCTION (this << dest << protocolNumber);
if(protocolNumber== ArpL3Protocol::PROT_NUMBER)
{
Ptr<Packet> p=packet->Copy();
ArpHeader arp;
uint32_t size = p->RemoveHeader (arp);
if (size == 0)
{
NS_LOG_LOGIC ("lte ue received ARP: but Cannot remove ARP header");
return true;
}
if (!arp.IsRequest ())
{
NS_LOG_LOGIC ("received arp packet is not arp request, don't react to act it");
return true;
}
//check if ip source address of arp request equal to that of this lte device. If NOT, don't send reply
Ipv4Address lteDeviceIpAddress = GetNode ()->GetObject<Ipv4> ()
->GetAddress (1, 0)
.GetLocal ();
if (arp.GetSourceIpv4Address () != lteDeviceIpAddress || arp.GetDestinationIpv4Address () != m_bsIpAddress)
return true;
Ipv4Address myIp = arp.GetDestinationIpv4Address ();
Ipv4Address toIp = arp.GetSourceIpv4Address ();
Address toMac = arp.GetSourceHardwareAddress ();
//generate arp reply
ArpHeader replyArp;
replyArp.SetReply (m_virtualAddress, myIp, toMac, toIp);
Ptr <Packet> replyPacket = Create<Packet> ();
replyPacket->AddHeader (replyArp);
enum NetDevice::PacketType type = NetDevice::PACKET_HOST;
m_promiscRx (this, replyPacket, ArpL3Protocol::PROT_NUMBER, m_virtualAddress, m_vmMacAdress, type);
return true;
}
return LteUeNetDevice::Send (packet, dest, protocolNumber);
}
}
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