/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2005 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 "ns3/assert.h"
#include "ns3/address-utils.h"
#include "arp-header.h"
namespace ns3 {
NS_OBJECT_ENSURE_REGISTERED (ArpHeader);
void
ArpHeader::SetRequest (Address sourceHardwareAddress,
Ipv4Address sourceProtocolAddress,
Address destinationHardwareAddress,
Ipv4Address destinationProtocolAddress)
{
m_type = ARP_TYPE_REQUEST;
m_macSource = sourceHardwareAddress;
m_macDest = destinationHardwareAddress;
m_ipv4Source = sourceProtocolAddress;
m_ipv4Dest = destinationProtocolAddress;
}
void
ArpHeader::SetReply (Address sourceHardwareAddress,
Ipv4Address sourceProtocolAddress,
Address destinationHardwareAddress,
Ipv4Address destinationProtocolAddress)
{
m_type = ARP_TYPE_REPLY;
m_macSource = sourceHardwareAddress;
m_macDest = destinationHardwareAddress;
m_ipv4Source = sourceProtocolAddress;
m_ipv4Dest = destinationProtocolAddress;
}
bool
ArpHeader::IsRequest (void) const
{
return (m_type == ARP_TYPE_REQUEST)?true:false;
}
bool
ArpHeader::IsReply (void) const
{
return (m_type == ARP_TYPE_REPLY)?true:false;
}
Address
ArpHeader::GetSourceHardwareAddress (void)
{
return m_macSource;
}
Address
ArpHeader::GetDestinationHardwareAddress (void)
{
return m_macDest;
}
Ipv4Address
ArpHeader::GetSourceIpv4Address (void)
{
return m_ipv4Source;
}
Ipv4Address
ArpHeader::GetDestinationIpv4Address (void)
{
return m_ipv4Dest;
}
TypeId
ArpHeader::GetTypeId (void)
{
static TypeId tid = TypeId ("ns3::ArpHeader")
.SetParent<Header> ()
.AddConstructor<ArpHeader> ()
;
return tid;
}
TypeId
ArpHeader::GetInstanceTypeId (void) const
{
return GetTypeId ();
}
void
ArpHeader::Print (std::ostream &os) const
{
if (IsRequest ())
{
os << "request "
<< "source mac: " << m_macSource << " "
<< "source ipv4: " << m_ipv4Source << " "
<< "dest ipv4: " << m_ipv4Dest
;
}
else
{
NS_ASSERT (IsReply ());
os << "reply "
<< "source mac: " << m_macSource << " "
<< "source ipv4: " << m_ipv4Source << " "
<< "dest mac: " << m_macDest << " "
<< "dest ipv4: " <<m_ipv4Dest
;
}
}
uint32_t
ArpHeader::GetSerializedSize (void) const
{
/* this is the size of an ARP payload. */
return 28;
}
void
ArpHeader::Serialize (Buffer::Iterator start) const
{
Buffer::Iterator i = start;
NS_ASSERT (m_macSource.GetLength () == m_macDest.GetLength ());
/* ethernet */
i.WriteHtonU16 (0x0001);
/* ipv4 */
i.WriteHtonU16 (0x0800);
i.WriteU8 (m_macSource.GetLength ());
i.WriteU8 (4);
i.WriteHtonU16 (m_type);
WriteTo (i, m_macSource);
WriteTo (i, m_ipv4Source);
WriteTo (i, m_macDest);
WriteTo (i, m_ipv4Dest);
}
uint32_t
ArpHeader::Deserialize (Buffer::Iterator start)
{
Buffer::Iterator i = start;
i.Next (2); // Skip HRD
uint32_t protocolType = i.ReadNtohU16 (); // Read PRO
uint32_t hardwareAddressLen = i.ReadU8 (); // Read HLN
uint32_t protocolAddressLen = i.ReadU8 (); // Read PLN
//
// It is implicit here that we have a protocol type of 0x800 (IP).
// It is also implicit here that we are using Ipv4 (PLN == 4).
// If this isn't the case, we need to return an error since we don't want to
// be too fragile if we get connected to real networks.
//
if (protocolType != 0x800 || protocolAddressLen != 4)
{
return 0;
}
m_type = i.ReadNtohU16 (); // Read OP
ReadFrom (i, m_macSource, hardwareAddressLen); // Read SHA (size HLN)
ReadFrom (i, m_ipv4Source); // Read SPA (size PLN == 4)
ReadFrom (i, m_macDest, hardwareAddressLen); // Read THA (size HLN)
ReadFrom (i, m_ipv4Dest); // Read TPA (size PLN == 4)
return GetSerializedSize ();
}
}; // namespace ns3