A Discrete-Event Network Simulator
API
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tcp-option-ts.cc
Go to the documentation of this file.
1/*
2 * Copyright (c) 2011 Adrian Sai-wah Tam
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation;
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 *
17 * Author: Adrian Sai-wah Tam <adrian.sw.tam@gmail.com>
18 */
19
20#include "tcp-option-ts.h"
21
22#include "ns3/log.h"
23
24namespace ns3
25{
26
27NS_LOG_COMPONENT_DEFINE("TcpOptionTS");
28
30
32 : TcpOption(),
33 m_timestamp(0),
34 m_echo(0)
35{
36}
37
39{
40}
41
44{
45 static TypeId tid = TypeId("ns3::TcpOptionTS")
47 .SetGroupName("Internet")
48 .AddConstructor<TcpOptionTS>();
49 return tid;
50}
51
54{
55 return GetTypeId();
56}
57
58void
59TcpOptionTS::Print(std::ostream& os) const
60{
61 os << m_timestamp << ";" << m_echo;
62}
63
66{
67 return 10;
68}
69
70void
72{
73 Buffer::Iterator i = start;
74 i.WriteU8(GetKind()); // Kind
75 i.WriteU8(10); // Length
76 i.WriteHtonU32(m_timestamp); // Local timestamp
77 i.WriteHtonU32(m_echo); // Echo timestamp
78}
79
82{
83 Buffer::Iterator i = start;
84
85 uint8_t readKind = i.ReadU8();
86 if (readKind != GetKind())
87 {
88 NS_LOG_WARN("Malformed Timestamp option");
89 return 0;
90 }
91
92 uint8_t size = i.ReadU8();
93 if (size != 10)
94 {
95 NS_LOG_WARN("Malformed Timestamp option");
96 return 0;
97 }
99 m_echo = i.ReadNtohU32();
100 return GetSerializedSize();
101}
102
103uint8_t
105{
106 return TcpOption::TS;
107}
108
111{
112 return m_timestamp;
113}
114
117{
118 return m_echo;
119}
120
121void
123{
124 m_timestamp = ts;
125}
126
127void
129{
130 m_echo = ts;
131}
132
135{
136 uint64_t now = (uint64_t)Simulator::Now().GetMilliSeconds();
137
138 // high: (now & 0xFFFFFFFF00000000ULL) >> 32;
139 // low: now & 0xFFFFFFFF
140 return (now & 0xFFFFFFFF);
141}
142
143Time
145{
146 uint64_t now64 = (uint64_t)Simulator::Now().GetMilliSeconds();
147 uint32_t now32 = now64 & 0xFFFFFFFF;
148
149 Time ret = Seconds(0.0);
150 if (now32 > echoTime)
151 {
152 ret = MilliSeconds(now32 - echoTime);
153 }
154
155 return ret;
156}
157
158} // namespace ns3
iterator in a Buffer instance
Definition: buffer.h:100
uint8_t ReadU8()
Definition: buffer.h:1027
void WriteU8(uint8_t data)
Definition: buffer.h:881
uint32_t ReadNtohU32()
Definition: buffer.h:978
void WriteHtonU32(uint32_t data)
Definition: buffer.h:933
static Time Now()
Return the current simulation virtual time.
Definition: simulator.cc:208
Base class for all kinds of TCP options.
Definition: tcp-option.h:38
Defines the TCP option of kind 8 (timestamp option) as in RFC 1323
Definition: tcp-option-ts.h:37
uint8_t GetKind() const override
Get the ‘kind’ (as in RFC 793) of this option.
void SetTimestamp(uint32_t ts)
Set the timestamp stored in the Option.
TypeId GetInstanceTypeId() const override
Get the most derived TypeId for this Object.
static Time ElapsedTimeFromTsValue(uint32_t echoTime)
Estimate the Time elapsed from a TS echo value.
uint32_t GetSerializedSize() const override
Returns number of bytes required for Option serialization.
static TypeId GetTypeId()
Get the type ID.
uint32_t GetTimestamp() const
Get the timestamp stored in the Option.
uint32_t Deserialize(Buffer::Iterator start) override
Deserialize the Option from a buffer iterator.
uint32_t m_timestamp
local timestamp
~TcpOptionTS() override
uint32_t GetEcho() const
Get the timestamp echo stored in the Option.
static uint32_t NowToTsValue()
Return an uint32_t value which represent "now".
void Serialize(Buffer::Iterator start) const override
Serialize the Option to a buffer iterator.
uint32_t m_echo
echo timestamp
void SetEcho(uint32_t ts)
Set the timestamp echo stored in the Option.
void Print(std::ostream &os) const override
Print the Option contents.
Simulation virtual time values and global simulation resolution.
Definition: nstime.h:105
int64_t GetMilliSeconds() const
Get an approximation of the time stored in this instance in the indicated unit.
Definition: nstime.h:408
a unique identifier for an interface.
Definition: type-id.h:59
TypeId SetParent(TypeId tid)
Set the parent TypeId.
Definition: type-id.cc:932
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
Definition: log.h:202
#define NS_LOG_WARN(msg)
Use NS_LOG to output a message of level LOG_WARN.
Definition: log.h:261
#define NS_OBJECT_ENSURE_REGISTERED(type)
Register an Object subclass with the TypeId system.
Definition: object-base.h:46
Time Seconds(double value)
Construct a Time in the indicated unit.
Definition: nstime.h:1326
Time MilliSeconds(uint64_t value)
Construct a Time in the indicated unit.
Definition: nstime.h:1338
Every class exported by the ns3 library is enclosed in the ns3 namespace.