342 lines
7.8 KiB
C++
342 lines
7.8 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Copyright (c) 2005,2006,2007 INRIA
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
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*/
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#include "ipv4-interface.h"
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#include "loopback-net-device.h"
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#include "ns3/ipv4-address.h"
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#include "ipv4-l3-protocol.h"
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#include "arp-l3-protocol.h"
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#include "arp-cache.h"
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#include "ns3/net-device.h"
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#include "ns3/log.h"
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#include "ns3/packet.h"
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#include "ns3/node.h"
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#include "ns3/pointer.h"
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NS_LOG_COMPONENT_DEFINE ("Ipv4Interface");
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namespace ns3 {
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TypeId
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Ipv4Interface::GetTypeId (void)
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{
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static TypeId tid = TypeId ("ns3::Ipv4Interface")
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.SetParent<Object> ()
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.AddAttribute ("ArpCache",
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"The arp cache for this ipv4 interface",
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PointerValue (0),
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MakePointerAccessor (&Ipv4Interface::SetArpCache,
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&Ipv4Interface::GetArpCache),
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MakePointerChecker<ArpCache> ())
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;
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;
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return tid;
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}
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/**
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* By default, Ipv4 interface are created in the "down" state
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* with no IP addresses. Before becoming useable, the user must
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* invoke SetUp on them once an Ipv4 address and mask have been set.
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*/
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Ipv4Interface::Ipv4Interface ()
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: m_ifup (false),
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m_forwarding (true),
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m_metric (1),
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m_node (0),
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m_device (0),
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m_cache (0)
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{
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NS_LOG_FUNCTION (this);
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}
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Ipv4Interface::~Ipv4Interface ()
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{
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NS_LOG_FUNCTION_NOARGS ();
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}
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void
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Ipv4Interface::DoDispose (void)
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{
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NS_LOG_FUNCTION_NOARGS ();
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m_node = 0;
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m_device = 0;
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Object::DoDispose ();
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}
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void
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Ipv4Interface::SetNode (Ptr<Node> node)
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{
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m_node = node;
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DoSetup ();
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}
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void
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Ipv4Interface::SetDevice (Ptr<NetDevice> device)
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{
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m_device = device;
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DoSetup ();
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}
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void
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Ipv4Interface::DoSetup (void)
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{
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if (m_node == 0 || m_device == 0)
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{
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return;
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}
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if (!m_device->NeedsArp ())
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{
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return;
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}
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Ptr<ArpL3Protocol> arp = m_node->GetObject<ArpL3Protocol> ();
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m_cache = arp->CreateCache (m_device, this);
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}
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Ptr<NetDevice>
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Ipv4Interface::GetDevice (void) const
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{
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return m_device;
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}
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void
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Ipv4Interface::SetMetric (uint16_t metric)
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{
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NS_LOG_FUNCTION (metric);
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m_metric = metric;
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}
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uint16_t
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Ipv4Interface::GetMetric (void) const
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{
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NS_LOG_FUNCTION_NOARGS ();
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return m_metric;
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}
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void
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Ipv4Interface::SetArpCache (Ptr<ArpCache> a)
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{
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m_cache = a;
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}
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Ptr<ArpCache>
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Ipv4Interface::GetArpCache () const
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{
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return m_cache;
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}
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/**
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* These are IP interface states and may be distinct from
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* NetDevice states, such as found in real implementations
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* (where the device may be down but IP interface state is still up).
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*/
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bool
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Ipv4Interface::IsUp (void) const
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{
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NS_LOG_FUNCTION_NOARGS ();
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return m_ifup;
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}
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bool
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Ipv4Interface::IsDown (void) const
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{
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NS_LOG_FUNCTION_NOARGS ();
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return !m_ifup;
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}
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void
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Ipv4Interface::SetUp (void)
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{
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NS_LOG_FUNCTION_NOARGS ();
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m_ifup = true;
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}
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void
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Ipv4Interface::SetDown (void)
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{
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NS_LOG_FUNCTION_NOARGS ();
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m_ifup = false;
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}
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bool
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Ipv4Interface::IsForwarding (void) const
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{
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NS_LOG_FUNCTION_NOARGS ();
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return m_forwarding;
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}
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void
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Ipv4Interface::SetForwarding (bool val)
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{
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NS_LOG_FUNCTION_NOARGS ();
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m_forwarding = val;
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}
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void
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Ipv4Interface::Send (Ptr<Packet> p, Ipv4Address dest)
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{
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NS_LOG_FUNCTION (dest << *p);
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if (!IsUp())
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{
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return;
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}
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// Check for a loopback device
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if (DynamicCast<LoopbackNetDevice> (m_device))
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{
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// XXX additional checks needed here (such as whether multicast
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// goes to loopback)?
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m_device->Send (p, m_device->GetBroadcast (),
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Ipv4L3Protocol::PROT_NUMBER);
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return;
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}
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// is this packet aimed at a local interface ?
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for (Ipv4InterfaceAddressListCI i = m_ifaddrs.begin (); i != m_ifaddrs.end (); ++i)
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{
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if (dest == (*i).GetLocal ())
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{
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Ptr<Ipv4L3Protocol> ipv4 = m_node->GetObject<Ipv4L3Protocol> ();
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ipv4->Receive (m_device, p, Ipv4L3Protocol::PROT_NUMBER,
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m_device->GetBroadcast (),
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m_device->GetBroadcast (),
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NetDevice::PACKET_HOST // note: linux uses PACKET_LOOPBACK here
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);
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return;
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}
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}
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if (m_device->NeedsArp ())
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{
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NS_LOG_LOGIC ("Needs ARP" << " " << dest);
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Ptr<ArpL3Protocol> arp = m_node->GetObject<ArpL3Protocol> ();
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Address hardwareDestination;
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bool found = false;
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if (dest.IsBroadcast ())
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{
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NS_LOG_LOGIC ("All-network Broadcast");
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hardwareDestination = m_device->GetBroadcast ();
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found = true;
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}
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else if (dest.IsMulticast ())
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{
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NS_LOG_LOGIC ("IsMulticast");
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NS_ASSERT_MSG(m_device->IsMulticast (),
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"ArpIpv4Interface::SendTo (): Sending multicast packet over "
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"non-multicast device");
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hardwareDestination = m_device->GetMulticast(dest);
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found = true;
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}
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else
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{
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for (Ipv4InterfaceAddressListCI i = m_ifaddrs.begin (); i != m_ifaddrs.end (); ++i)
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{
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if (dest.IsSubnetDirectedBroadcast ((*i).GetMask ()))
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{
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NS_LOG_LOGIC ("Subnetwork Broadcast");
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hardwareDestination = m_device->GetBroadcast ();
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found = true;
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break;
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}
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}
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if (!found)
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{
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NS_LOG_LOGIC ("ARP Lookup");
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found = arp->Lookup (p, dest, m_device, m_cache, &hardwareDestination);
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}
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}
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if (found)
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{
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NS_LOG_LOGIC ("Address Resolved. Send.");
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m_device ->Send (p, hardwareDestination,
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Ipv4L3Protocol::PROT_NUMBER);
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}
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}
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else
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{
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NS_LOG_LOGIC ("Doesn't need ARP");
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m_device->Send (p, m_device->GetBroadcast (),
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Ipv4L3Protocol::PROT_NUMBER);
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}
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}
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uint32_t
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Ipv4Interface::GetNAddresses (void) const
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{
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NS_LOG_FUNCTION_NOARGS ();
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return m_ifaddrs.size();
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}
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bool
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Ipv4Interface::AddAddress (Ipv4InterfaceAddress addr)
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{
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NS_LOG_FUNCTION_NOARGS ();
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m_ifaddrs.push_back (addr);
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return true;
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}
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Ipv4InterfaceAddress
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Ipv4Interface::GetAddress (uint32_t index) const
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{
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NS_LOG_FUNCTION_NOARGS ();
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if (index < m_ifaddrs.size ())
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{
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uint32_t tmp = 0;
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for (Ipv4InterfaceAddressListCI i = m_ifaddrs.begin (); i!= m_ifaddrs.end (); i++)
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{
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if (tmp == index)
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{
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return *i;
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}
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++tmp;
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}
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}
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NS_ASSERT (false); // Assert if not found
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Ipv4InterfaceAddress addr;
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return (addr); // quiet compiler
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}
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Ipv4InterfaceAddress
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Ipv4Interface::RemoveAddress (uint32_t index)
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{
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NS_LOG_FUNCTION_NOARGS ();
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if (index >= m_ifaddrs.size ())
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{
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NS_ASSERT_MSG (false, "Bug in Ipv4Interface::RemoveAddress");
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}
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Ipv4InterfaceAddressListI i = m_ifaddrs.begin ();
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uint32_t tmp = 0;
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while (i != m_ifaddrs.end ())
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{
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if (tmp == index)
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{
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Ipv4InterfaceAddress addr = *i;
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m_ifaddrs.erase (i);
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return addr;
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}
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++tmp;
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}
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NS_ASSERT_MSG (false, "Address " << index << " not found");
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Ipv4InterfaceAddress addr;
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return (addr); // quiet compiler
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}
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}; // namespace ns3
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