A Discrete-Event Network Simulator
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dsr-gratuitous-reply-table.h
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1/*
2 * Copyright (c) 2011 Yufei Cheng
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 * Author: Yufei Cheng <yfcheng@ittc.ku.edu>
7 *
8 * James P.G. Sterbenz <jpgs@ittc.ku.edu>, director
9 * ResiliNets Research Group https://resilinets.org/
10 * Information and Telecommunication Technology Center (ITTC)
11 * and Department of Electrical Engineering and Computer Science
12 * The University of Kansas Lawrence, KS USA.
13 *
14 * Work supported in part by NSF FIND (Future Internet Design) Program
15 * under grant CNS-0626918 (Postmodern Internet Architecture),
16 * NSF grant CNS-1050226 (Multilayer Network Resilience Analysis and Experimentation on GENI),
17 * US Department of Defense (DoD), and ITTC at The University of Kansas.
18 */
19
20#ifndef DSR_GRATUITOUS_REPLY_TABLE_H
21#define DSR_GRATUITOUS_REPLY_TABLE_H
22
23#include "ns3/callback.h"
24#include "ns3/ipv4-address.h"
25#include "ns3/simulator.h"
26#include "ns3/timer.h"
27
28#include <vector>
29
30namespace ns3
31{
32namespace dsr
33{
34/**
35 * The gratuitous table entries, it maintains the already sent gratuitous route reply entries.
36 * When the node "promiscuously" received a packet destined for other nodes, and inferred a shorter
37 * route for the data packet, it will construct a route reply and send back to the source
38 */
40{
41 Ipv4Address m_replyTo; ///< reply to address
42 Ipv4Address m_hearFrom; ///< heard from address
43 Time m_gratReplyHoldoff; ///< gratuitous reply holdoff time
44
45 /**
46 * Constructor
47 *
48 * \param t IPv4 address to reply to
49 * \param f IPv4 address to hear from
50 * \param h gratuitous hold off time
51 */
58};
59
60/**
61 * \ingroup dsr
62 * \brief maintain the gratuitous reply
63 */
64class DsrGraReply : public Object
65{
66 public:
67 /**
68 * \brief Get the type ID.
69 * \return the object TypeId
70 */
71 static TypeId GetTypeId();
72
74 ~DsrGraReply() override;
75
76 /// Set the gratuitous reply table size
77 /// \param g The gratuitous reply table size
79 {
81 }
82
83 /// Get the gratuitous reply table size
84 /// \returns The gratuitous reply table size
86 {
87 return GraReplyTableSize;
88 }
89
90 /// Add a new gratuitous reply entry
91 /// \param graTableEntry The gratuitous reply entry
92 /// \return true on success
93 bool AddEntry(GraReplyEntry& graTableEntry);
94 /// Update the route entry if found
95 /// \param replyTo Entry directed to
96 /// \param replyFrom Entry heard from
97 /// \param gratReplyHoldoff New gratuitous reply holdoff time
98 /// \return true on success
99 bool FindAndUpdate(Ipv4Address replyTo, Ipv4Address replyFrom, Time gratReplyHoldoff);
100 /// Remove all expired entries
101 void Purge();
102
103 /// Remove all entries
104 void Clear()
105 {
106 m_graReply.clear();
107 }
108
109 private:
110 /// Vector of entries
111 std::vector<GraReplyEntry> m_graReply;
112 /// The max # of gratuitous reply entries to hold
114
115 /// Check if the entry is expired or not
117 {
118 /**
119 * Check if the entry is expired
120 *
121 * \param b GraReplyEntry entry
122 * \return true if expired, false otherwise
123 */
124 bool operator()(const GraReplyEntry& b) const
125 {
126 return (b.m_gratReplyHoldoff < Simulator::Now());
127 }
128 };
129};
130} // namespace dsr
131} // namespace ns3
132
133#endif /* DSR_GRATUITOUS_REPLY_TABLE_H */
Ipv4 addresses are stored in host order in this class.
A base class which provides memory management and object aggregation.
Definition object.h:78
static Time Now()
Return the current simulation virtual time.
Definition simulator.cc:197
Simulation virtual time values and global simulation resolution.
Definition nstime.h:94
a unique identifier for an interface.
Definition type-id.h:48
maintain the gratuitous reply
bool AddEntry(GraReplyEntry &graTableEntry)
Add a new gratuitous reply entry.
static TypeId GetTypeId()
Get the type ID.
std::vector< GraReplyEntry > m_graReply
Vector of entries.
uint32_t GraReplyTableSize
The max # of gratuitous reply entries to hold.
void SetGraTableSize(uint32_t g)
Set the gratuitous reply table size.
void Purge()
Remove all expired entries.
uint32_t GetGraTableSize() const
Get the gratuitous reply table size.
bool FindAndUpdate(Ipv4Address replyTo, Ipv4Address replyFrom, Time gratReplyHoldoff)
Update the route entry if found.
void Clear()
Remove all entries.
Every class exported by the ns3 library is enclosed in the ns3 namespace.
Check if the entry is expired or not.
bool operator()(const GraReplyEntry &b) const
Check if the entry is expired.
The gratuitous table entries, it maintains the already sent gratuitous route reply entries.
GraReplyEntry(Ipv4Address t, Ipv4Address f, Time h)
Constructor.
Time m_gratReplyHoldoff
gratuitous reply holdoff time
Ipv4Address m_replyTo
reply to address
Ipv4Address m_hearFrom
heard from address