/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2004 Francisco J. Ros 

 * Copyright (c) 2007 INESC Porto

 *

 * 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

 *

 * Authors: Francisco J. Ros  <fjrm@dif.um.es>

 *          Gustavo J. A. M. Carneiro <gjc@inescporto.pt>

 */

#ifndef __OLSR_AGENT_IMPL_H__

#define __OLSR_AGENT_IMPL_H__

#include "olsr-header.h"

#include "olsr-state.h"

#include "olsr-repositories.h"

#include "ns3/object.h"

#include "ns3/packet.h"

#include "ns3/node.h"

#include "ns3/socket.h"

#include "ns3/event-garbage-collector.h"

#include "ns3/timer.h"

#include "ns3/traced-callback.h"

#include "ns3/ipv4.h"

#include <vector>

#include <map>

namespace ns3 {

namespace olsr {

/// An %OLSR's routing table entry.

struct RoutingTableEntry

{

  Ipv4Address destAddr;	///< Address of the destination node.

  Ipv4Address nextAddr;	///< Address of the next hop.

  uint32_t interface; ///< Interface index

  uint32_t distance; ///< Distance in hops to the destination.

  RoutingTableEntry () : // default values

    destAddr (), nextAddr (),

    interface (0), distance (0) {};

};

class RoutingProtocol : public Ipv4RoutingProtocol

{

public:

  static TypeId GetTypeId (void);

  RoutingProtocol ();

  virtual ~RoutingProtocol ();

  void SetNode (Ptr<Node> node);

  void Start ();

  void SetMainInterface (uint32_t interface);

private:

  std::map<Ipv4Address, RoutingTableEntry> m_table; ///< Data structure for the routing table.

  EventGarbageCollector m_events;

  /// Address of the routing agent.

  Ipv4Address m_routingAgentAddr;

  /// Packets sequence number counter.

  uint16_t m_packetSequenceNumber;

  /// Messages sequence number counter.

  uint16_t m_messageSequenceNumber;

  /// Advertised Neighbor Set sequence number.

  uint16_t m_ansn;

  /// HELLO messages' emission interval.

  Time m_helloInterval;

  /// TC messages' emission interval.

  Time m_tcInterval;

  /// MID messages' emission interval.

  Time m_midInterval;

  /// Willingness for forwarding packets on behalf of other nodes.

  uint8_t m_willingness;

  /// Internal state with all needed data structs.

  OlsrState m_state;

  Ptr<Ipv4> m_ipv4;

private:

  void Clear ();

  uint32_t GetSize () const { return m_table.size (); }

  std::vector<RoutingTableEntry> GetEntries () const;

  void RemoveEntry (const Ipv4Address &dest);

  void AddEntry (const Ipv4Address &dest,

                 const Ipv4Address &next,

                 uint32_t interface,

                 uint32_t distance);

  void AddEntry (const Ipv4Address &dest,

                 const Ipv4Address &next,

                 const Ipv4Address &interfaceAddress,

                 uint32_t distance);

  bool Lookup (const Ipv4Address &dest,

               RoutingTableEntry &outEntry) const;

  bool FindSendEntry (const RoutingTableEntry &entry,

                      RoutingTableEntry &outEntry) const;

  // From Ipv4RoutingProtocol

  void DoDispose ();

  void SendPacket (Ptr<Packet> packet, const MessageList &containedMessages);

  /// Increments packet sequence number and returns the new value.

  inline uint16_t GetPacketSequenceNumber ();

  /// Increments message sequence number and returns the new value.

  inline uint16_t GetMessageSequenceNumber ();

  void RecvOlsr (Ptr<Socket> socket);

  void MprComputation ();

  void RoutingTableComputation ();

  Ipv4Address GetMainAddress (Ipv4Address iface_addr) const;

  // Timer handlers

  Timer m_helloTimer;

  void HelloTimerExpire ();

  Timer m_tcTimer;

  void TcTimerExpire ();

  Timer m_midTimer;

  void MidTimerExpire ();

  void DupTupleTimerExpire (Ipv4Address address, uint16_t sequenceNumber);

  bool m_linkTupleTimerFirstTime;

  void LinkTupleTimerExpire (Ipv4Address neighborIfaceAddr);

  void Nb2hopTupleTimerExpire (Ipv4Address neighborMainAddr, Ipv4Address twoHopNeighborAddr);

  void MprSelTupleTimerExpire (Ipv4Address mainAddr);

  void TopologyTupleTimerExpire (Ipv4Address destAddr, Ipv4Address lastAddr);

  void IfaceAssocTupleTimerExpire (Ipv4Address ifaceAddr);

  void IncrementAnsn ();

  /// A list of pending messages which are buffered awaiting for being sent.

  olsr::MessageList m_queuedMessages;

  Timer m_queuedMessagesTimer; // timer for throttling outgoing messages

  void ForwardDefault (olsr::MessageHeader olsrMessage,

                       DuplicateTuple *duplicated,

                       const Ipv4Address &localIface,

                       const Ipv4Address &senderAddress);

  void QueueMessage (const olsr::MessageHeader &message, Time delay);

  void SendQueuedMessages ();

  void SendHello ();

  void SendTc ();

  void SendMid ();

  void NeighborLoss (const LinkTuple &tuple);

  void AddDuplicateTuple (const DuplicateTuple &tuple);

  void RemoveDuplicateTuple (const DuplicateTuple &tuple);

  void LinkTupleAdded (const LinkTuple &tuple, uint8_t willingness);

  void RemoveLinkTuple (const LinkTuple &tuple);

  void LinkTupleUpdated (const LinkTuple &tuple, uint8_t willingness);

  void AddNeighborTuple (const NeighborTuple &tuple);

  void RemoveNeighborTuple (const NeighborTuple &tuple);

  void AddTwoHopNeighborTuple (const TwoHopNeighborTuple &tuple);

  void RemoveTwoHopNeighborTuple (const TwoHopNeighborTuple &tuple);

  void AddMprSelectorTuple (const MprSelectorTuple  &tuple);

  void RemoveMprSelectorTuple (const MprSelectorTuple &tuple);

  void AddTopologyTuple (const TopologyTuple &tuple);

  void RemoveTopologyTuple (const TopologyTuple &tuple);

  void AddIfaceAssocTuple (const IfaceAssocTuple &tuple);

  void RemoveIfaceAssocTuple (const IfaceAssocTuple &tuple);

  void ProcessHello (const olsr::MessageHeader &msg,

                     const Ipv4Address &receiverIface,

                     const Ipv4Address &senderIface);

  void ProcessTc (const olsr::MessageHeader &msg,

                  const Ipv4Address &senderIface);

  void ProcessMid (const olsr::MessageHeader &msg,

                   const Ipv4Address &senderIface);

  void LinkSensing (const olsr::MessageHeader &msg,

                    const olsr::MessageHeader::Hello &hello,

                    const Ipv4Address &receiverIface,

                    const Ipv4Address &sender_iface);

  void PopulateNeighborSet (const olsr::MessageHeader &msg,

                            const olsr::MessageHeader::Hello &hello);

  void PopulateTwoHopNeighborSet (const olsr::MessageHeader &msg,

                                  const olsr::MessageHeader::Hello &hello);

  void PopulateMprSelectorSet (const olsr::MessageHeader &msg,

                               const olsr::MessageHeader::Hello &hello);

  int Degree (NeighborTuple const &tuple);

  Ipv4Address m_mainAddress;

  // One socket per interface, each bound to that interface's address

  // (reason: for OLSR Link Sensing we need to know on which interface

  // HELLO messages arrive)

  std::map< Ptr<Socket>, Ipv4Address > m_socketAddresses;

  TracedCallback <const PacketHeader &,

                  const MessageList &> m_rxPacketTrace;

  TracedCallback <const PacketHeader &,

                  const MessageList &> m_txPacketTrace;

  TracedCallback <uint32_t> m_routingTableChanged;

};

}} // namespace ns3

#endif