/usr/include/ns3.27/ns3/dsdv-packet-queue.h is in libns3-dev 3.27+dfsg-1.
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/*
* Copyright (c) 2010 Hemanth Narra
*
* 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: Hemanth Narra <hemanth@ittc.ku.com>
*
* James P.G. Sterbenz <jpgs@ittc.ku.edu>, director
* ResiliNets Research Group http://wiki.ittc.ku.edu/resilinets
* Information and Telecommunication Technology Center (ITTC)
* and Department of Electrical Engineering and Computer Science
* The University of Kansas Lawrence, KS USA.
*
* Work supported in part by NSF FIND (Future Internet Design) Program
* under grant CNS-0626918 (Postmodern Internet Architecture),
* NSF grant CNS-1050226 (Multilayer Network Resilience Analysis and Experimentation on GENI),
* US Department of Defense (DoD), and ITTC at The University of Kansas.
*/
#ifndef DSDV_PACKETQUEUE_H
#define DSDV_PACKETQUEUE_H
#include <vector>
#include "ns3/ipv4-routing-protocol.h"
#include "ns3/simulator.h"
namespace ns3 {
namespace dsdv {
/**
* \ingroup dsdv
* \brief DSDV Queue Entry
*/
class QueueEntry
{
public:
/// Unicast forward call back function typedef
typedef Ipv4RoutingProtocol::UnicastForwardCallback UnicastForwardCallback;
/// Error callback function typedef
typedef Ipv4RoutingProtocol::ErrorCallback ErrorCallback;
/**
* c-tor
*
* \param pa the packet to create the entry
* \param h the Ipv4Header
* \param ucb the UnicastForwardCallback function
* \param ecb the ErrorCallback function
*/
QueueEntry (Ptr<const Packet> pa = 0, Ipv4Header const & h = Ipv4Header (),
UnicastForwardCallback ucb = UnicastForwardCallback (),
ErrorCallback ecb = ErrorCallback ())
: m_packet (pa),
m_header (h),
m_ucb (ucb),
m_ecb (ecb),
m_expire (Seconds (0))
{
}
/**
* Compare queue entries
* \param o QueueEntry to compare
* \return true if equal
*/
bool operator== (QueueEntry const & o) const
{
return ((m_packet == o.m_packet) && (m_header.GetDestination () == o.m_header.GetDestination ()) && (m_expire == o.m_expire));
}
// Fields
/**
* Get unicast forward callback function
* \returns the unicast forward callback
*/
UnicastForwardCallback GetUnicastForwardCallback () const
{
return m_ucb;
}
/**
* Set unicast forward callback function
* \param ucb the unicast forward callback
*/
void SetUnicastForwardCallback (UnicastForwardCallback ucb)
{
m_ucb = ucb;
}
/**
* Get error callback function
* \returns the error callback
*/
ErrorCallback GetErrorCallback () const
{
return m_ecb;
}
/**
* Set error callback function
* \param ecb the error callback
*/
void SetErrorCallback (ErrorCallback ecb)
{
m_ecb = ecb;
}
/**
* Get packet
* \returns the current packet
*/
Ptr<const Packet> GetPacket () const
{
return m_packet;
}
/**
* Set packet
* \param p The current packet
*/
void SetPacket (Ptr<const Packet> p)
{
m_packet = p;
}
/**
* Get IP header
* \returns the IPv4 header
*/
Ipv4Header GetIpv4Header () const
{
return m_header;
}
/**
* Set IP header
* \param h The IPv4 header
*/
void SetIpv4Header (Ipv4Header h)
{
m_header = h;
}
/**
* Set expire time
* \param exp
*/
void SetExpireTime (Time exp)
{
m_expire = exp + Simulator::Now ();
}
/**
* Get expire time
* \returns the expire time
*/
Time GetExpireTime () const
{
return m_expire - Simulator::Now ();
}
private:
/// Data packet
Ptr<const Packet> m_packet;
/// IP header
Ipv4Header m_header;
/// Unicast forward callback
UnicastForwardCallback m_ucb;
/// Error callback
ErrorCallback m_ecb;
/// Expire time for queue entry
Time m_expire;
};
/**
* \ingroup dsdv
* \brief DSDV Packet queue
*
* When a route is not available, the packets are queued. Every node can buffer up to 5 packets per
* destination. We have implemented a "drop front on full" queue where the first queued packet will be dropped
* to accommodate newer packets.
*/
class PacketQueue
{
public:
/// Default c-tor
PacketQueue ()
{
}
/**
* Push entry in queue, if there is no entry with the same packet and destination address in queue.
* \param entry QueueEntry to compare
* \return true if successful
*/
bool Enqueue (QueueEntry & entry);
/**
* Return first found (the earliest) entry for given destination
*
* \param dst the destination IP address
* \param entry the queue entry
* \returns true if successful
*/
bool Dequeue (Ipv4Address dst, QueueEntry & entry);
/**
* Remove all packets with destination IP address dst
* \param dst the destination IP address
*/
void DropPacketWithDst (Ipv4Address dst);
/**
* Finds whether a packet with destination dst exists in the queue
* \param dst the destination IP address
* \returns true if a packet found
*/
bool Find (Ipv4Address dst);
/**
* Get count of packets with destination dst in the queue
* \param dst the destination IP address
* \returns the count
*/
uint32_t
GetCountForPacketsWithDst (Ipv4Address dst);
/**
* Get the number of entries
* \returns the number of entries
*/
uint32_t GetSize ();
// Fields
/**
* Get maximum queue length
* \returns the maximum queue length
*/
uint32_t GetMaxQueueLen () const
{
return m_maxLen;
}
/**
* Set maximum queue length
* \param len the maximum queue length
*/
void SetMaxQueueLen (uint32_t len)
{
m_maxLen = len;
}
/**
* Get maximum packets per destination
* \returns the maximum packets per destination
*/
uint32_t GetMaxPacketsPerDst () const
{
return m_maxLenPerDst;
}
/**
* Set maximum packets per destination
* \param len The maximum packets per destination
*/
void SetMaxPacketsPerDst (uint32_t len)
{
m_maxLenPerDst = len;
}
/**
* Get queue timeout
* \returns the queue timeout
*/
Time GetQueueTimeout () const
{
return m_queueTimeout;
}
/**
* Set queue timeout
* \param t The queue timeout
*/
void SetQueueTimeout (Time t)
{
m_queueTimeout = t;
}
private:
std::vector<QueueEntry> m_queue; ///< the queue
/// Remove all expired entries
void Purge ();
/**
* Notify that the packet is dropped from queue due to timeout
* \param en the queue entry
* \param reason the reason for the packet drop
*/
void Drop (QueueEntry en, std::string reason);
/// The maximum number of packets that we allow a routing protocol to buffer.
uint32_t m_maxLen;
/// The maximum number of packets that we allow per destination to buffer.
uint32_t m_maxLenPerDst;
/// The maximum period of time that a routing protocol is allowed to buffer a packet for, seconds.
Time m_queueTimeout;
/**
* Determine if queue entries are equal
* \param en the queue entry
* \param dst the IPv4 destination address
* \returns true if the entry is for the destination address
*/
static bool IsEqual (QueueEntry en, const Ipv4Address dst)
{
return (en.GetIpv4Header ().GetDestination () == dst);
}
};
}
}
#endif /* DSDV_PACKETQUEUE_H */
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