256 lines
8.8 KiB
C++
256 lines
8.8 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Copyright (c) 2005,2006 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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* Modified by Emmanuelle Laprise to remove dependance on LLC headers
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*/
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#ifndef NET_DEVICE_H
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#define NET_DEVICE_H
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#include <string>
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#include <stdint.h>
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#include "ns3/callback.h"
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#include "ns3/object.h"
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#include "ns3/ptr.h"
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#include "address.h"
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#include "ipv4-address.h"
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namespace ns3 {
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class Node;
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class Channel;
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class Packet;
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/**
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* \brief Network layer to device interface
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*
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* This interface defines the API which the IP and ARP
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* layers need to access to manage an instance of a network device
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* layer. It currently does not support MAC-level
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* multicast but this should not be too hard to add by adding
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* extra methods to register MAC multicast addresses to
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* filter out unwanted packets before handing them to the
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* higher layers.
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*
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* In Linux, this interface is analogous to the interface
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* just above dev_queue_xmit() (i.e., IP packet is fully
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* constructed with destination MAC address already selected).
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*
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* If you want to write a new MAC layer, you need to subclass
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* this base class and implement your own version of the
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* NetDevice::SendTo method.
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*/
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class NetDevice : public Object
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{
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public:
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static TypeId GetTypeId (void);
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virtual ~NetDevice();
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/**
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* \param name name of the device (e.g. "eth0")
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*/
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virtual void SetName(const std::string name) = 0;
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/**
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* \return name name of the device (e.g. "eth0")
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*/
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virtual std::string GetName(void) const = 0;
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/**
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* \param index ifIndex of the device
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*/
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virtual void SetIfIndex(const uint32_t index) = 0;
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/**
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* \return index ifIndex of the device
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*/
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virtual uint32_t GetIfIndex(void) const = 0;
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/**
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* \return the channel this NetDevice is connected to. The value
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* returned can be zero if the NetDevice is not yet connected
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* to any channel.
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*/
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virtual Ptr<Channel> GetChannel (void) const = 0;
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/**
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* \return the current Address of this interface.
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*/
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virtual Address GetAddress (void) const = 0;
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/**
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* \param mtu MTU value, in bytes, to set for the device
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* \return whether the MTU value was within legal bounds
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*
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* Override for default MTU defined on a per-type basis.
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*/
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virtual bool SetMtu (const uint16_t mtu) = 0;
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/**
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* \return the link-level MTU in bytes for this interface.
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*
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* This value is typically used by the IP layer to perform
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* IP fragmentation when needed.
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*/
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virtual uint16_t GetMtu (void) const = 0;
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/**
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* \return true if link is up; false otherwise
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*/
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virtual bool IsLinkUp (void) const = 0;
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/**
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* \param callback the callback to invoke
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*
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* Register a callback invoked whenever the link
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* status changes to UP. This callback is typically used
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* by the IP/ARP layer to flush the ARP cache
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* whenever the link goes up.
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*/
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virtual void SetLinkChangeCallback (Callback<void> callback) = 0;
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/**
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* \return true if this interface supports a broadcast address,
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* false otherwise.
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*/
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virtual bool IsBroadcast (void) const = 0;
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/**
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* \return the broadcast address supported by
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* this netdevice.
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*
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* Calling this method is invalid if IsBroadcast returns
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* not true.
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*/
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virtual Address GetBroadcast (void) const = 0;
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/**
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* \return value of m_isMulticast flag
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*/
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virtual bool IsMulticast (void) const = 0;
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/**
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* \brief Return the MAC multicast base address used when mapping multicast
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* groups to MAC multicast addresses.
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*
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* Typically when one constructs a multicast MAC addresses, some bits from
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* the IP multicast group are copied into a corresponding MAC multicast
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* group. In EUI-48, for example, the low order 23 bits of the multicast
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* group are copied to the MAC multicast group base address.
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*
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* This method allows access to the underlying MAC multicast group base
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* address. It is expected that in most cases, a net device client will
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* allow the net device to perform the actual construction of the multicast
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* address. Use of this method is discouraged unless you have a good reason
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* to perform a custom mapping. You should prefer
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* NetDevice::MakeMulticastAddress which will do the RFC-specified mapping
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* for the net device in question.
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*
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* \return The multicast address supported by this net device.
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*
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* \warning Calling this method is invalid if IsMulticast returns not true.
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* The method NS_ASSERTs if the device is not a multicast device.
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* \see NetDevice::MakeMulticastAddress
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*/
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virtual Address GetMulticast (void) const = 0;
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/**
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* \brief Make and return a MAC multicast address using the provided
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* multicast group
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*
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* RFC 1112 says that an Ipv4 host group address is mapped to an Ethernet
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* multicast address by placing the low-order 23-bits of the IP address into
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* the low-order 23 bits of the Ethernet multicast address
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* 01-00-5E-00-00-00 (hex). Similar RFCs exist for Ipv6 and Eui64 mappings.
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* This method performs the multicast address creation function appropriate
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* to the underlying MAC address of the device. This MAC address is
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* encapsulated in an abstract Address to avoid dependencies on the exact
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* MAC address format.
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*
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* A default imlementation of MakeMulticastAddress is provided, but this
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* method simply NS_ASSERTS. In the case of net devices that do not support
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* multicast, clients are expected to test NetDevice::IsMulticast and avoid
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* attempting to map multicast packets. Subclasses of NetDevice that do
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* support multicasting are expected to override this method and provide an
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* implementation appropriate to the particular device.
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*
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* \param multicastGroup The IP address for the multicast group destination
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* of the packet.
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* \return The MAC multicast Address used to send packets to the provided
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* multicast group.
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*
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* \warning Calling this method is invalid if IsMulticast returns not true.
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* \see Ipv4Address
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* \see Address
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* \see NetDevice::IsMulticast
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*/
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virtual Address MakeMulticastAddress (Ipv4Address multicastGroup) const = 0;
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/**
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* \return value of m_isPointToPoint flag
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*/
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virtual bool IsPointToPoint (void) const = 0;
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/**
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* \param packet packet sent from above down to Network Device
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* \param dest mac address of the destination (already resolved)
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* \param protocolNumber identifies the type of payload contained in
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* this packet. Used to call the right L3Protocol when the packet
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* is received.
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*
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* Called from higher layer to send packet into Network Device
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* to the specified destination Address
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*
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* \return whether the Send operation succeeded
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*/
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virtual bool Send(Ptr<Packet> packet, const Address& dest, uint16_t protocolNumber) = 0;
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/**
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* \returns the node base class which contains this network
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* interface.
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*
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* When a subclass needs to get access to the underlying node
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* base class to print the nodeid for example, it can invoke
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* this method.
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*/
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virtual Ptr<Node> GetNode (void) const = 0;
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virtual void SetNode (Ptr<Node> node) = 0;
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/**
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* \returns true if ARP is needed, false otherwise.
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*
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* Called by higher-layers to check if this NetDevice requires
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* ARP to be used.
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*/
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virtual bool NeedsArp (void) const = 0;
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/**
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* \param device a pointer to the net device which is calling this callback
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* \param packet the packet received
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* \param protocol the 16 bit protocol number associated with this packet.
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* This protocol number is expected to be the same protocol number
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* given to the Send method by the user on the sender side.
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* \param address the address of the sender
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* \returns true if the callback could handle the packet successfully, false
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* otherwise.
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*/
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typedef Callback<bool,Ptr<NetDevice>,Ptr<Packet>,uint16_t,const Address &> ReceiveCallback;
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/**
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* \param cb callback to invoke whenever a packet has been received and must
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* be forwarded to the higher layers.
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*
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*/
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virtual void SetReceiveCallback (ReceiveCallback cb) = 0;
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};
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} // namespace ns3
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#endif /* NET_DEVICE_H */
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