tcp-option-rfc793.cc

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/*
 * Copyright (c) 2011 Adrian Sai-wah Tam
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Author: Adrian Sai-wah Tam <adrian.sw.tam@gmail.com>
 */
 
// TCP options that are specified in RFC 793 (kinds 0, 1, and 2)
 
#include "tcp-option-rfc793.h"
 
#include "ns3/log.h"
 
namespace ns3
{
 
NS_LOG_COMPONENT_DEFINE("TcpOptionRfc793");
 
NS_OBJECT_ENSURE_REGISTERED(TcpOptionEnd);
 
TcpOptionEnd::TcpOptionEnd()
    : TcpOption()
{
}
 
TcpOptionEnd::~TcpOptionEnd()
{
}
 
TypeId
TcpOptionEnd::GetTypeId()
{
    static TypeId tid = TypeId("ns3::TcpOptionEnd")
                            .SetParent<TcpOption>()
                            .SetGroupName("Internet")
                            .AddConstructor<TcpOptionEnd>();
    return tid;
}
 
TypeId
TcpOptionEnd::GetInstanceTypeId() const
{
    return GetTypeId();
}
 
void
TcpOptionEnd::Print(std::ostream& os) const
{
    os << "EOL";
}
 
uint32_t
TcpOptionEnd::GetSerializedSize() const
{
    return 1;
}
 
void
TcpOptionEnd::Serialize(Buffer::Iterator start) const
{
    Buffer::Iterator i = start;
    i.WriteU8(GetKind());
}
 
uint32_t
TcpOptionEnd::Deserialize(Buffer::Iterator start)
{
    Buffer::Iterator i = start;
 
    uint8_t readKind = i.ReadU8();
 
    if (readKind != GetKind())
    {
        NS_LOG_WARN("Malformed END option");
        return 0;
    }
 
    return GetSerializedSize();
}
 
uint8_t
TcpOptionEnd::GetKind() const
{
    return TcpOption::END;
}
 
// Tcp Option NOP
 
NS_OBJECT_ENSURE_REGISTERED(TcpOptionNOP);
 
TcpOptionNOP::TcpOptionNOP()
    : TcpOption()
{
}
 
TcpOptionNOP::~TcpOptionNOP()
{
}
 
TypeId
TcpOptionNOP::GetTypeId()
{
    static TypeId tid = TypeId("ns3::TcpOptionNOP")
                            .SetParent<TcpOption>()
                            .SetGroupName("Internet")
                            .AddConstructor<TcpOptionNOP>();
    return tid;
}
 
TypeId
TcpOptionNOP::GetInstanceTypeId() const
{
    return GetTypeId();
}
 
void
TcpOptionNOP::Print(std::ostream& os) const
{
    os << "NOP";
}
 
uint32_t
TcpOptionNOP::GetSerializedSize() const
{
    return 1;
}
 
void
TcpOptionNOP::Serialize(Buffer::Iterator start) const
{
    Buffer::Iterator i = start;
    i.WriteU8(GetKind());
}
 
uint32_t
TcpOptionNOP::Deserialize(Buffer::Iterator start)
{
    Buffer::Iterator i = start;
 
    uint8_t readKind = i.ReadU8();
    if (readKind != GetKind())
    {
        NS_LOG_WARN("Malformed NOP option");
        return 0;
    }
 
    return GetSerializedSize();
}
 
uint8_t
TcpOptionNOP::GetKind() const
{
    return TcpOption::NOP;
}
 
// Tcp Option MSS
 
NS_OBJECT_ENSURE_REGISTERED(TcpOptionMSS);
 
TcpOptionMSS::TcpOptionMSS()
    : TcpOption(),
      m_mss(1460)
{
}
 
TcpOptionMSS::~TcpOptionMSS()
{
}
 
TypeId
TcpOptionMSS::GetTypeId()
{
    static TypeId tid = TypeId("ns3::TcpOptionMSS")
                            .SetParent<TcpOption>()
                            .SetGroupName("Internet")
                            .AddConstructor<TcpOptionMSS>();
    return tid;
}
 
TypeId
TcpOptionMSS::GetInstanceTypeId() const
{
    return GetTypeId();
}
 
void
TcpOptionMSS::Print(std::ostream& os) const
{
    os << "MSS:" << m_mss;
}
 
uint32_t
TcpOptionMSS::GetSerializedSize() const
{
    return 4;
}
 
void
TcpOptionMSS::Serialize(Buffer::Iterator start) const
{
    Buffer::Iterator i = start;
    i.WriteU8(GetKind());  // Kind
    i.WriteU8(4);          // Length
    i.WriteHtonU16(m_mss); // Max segment size
}
 
uint32_t
TcpOptionMSS::Deserialize(Buffer::Iterator start)
{
    Buffer::Iterator i = start;
 
    uint8_t readKind = i.ReadU8();
    if (readKind != GetKind())
    {
        NS_LOG_WARN("Malformed MSS option");
        return 0;
    }
 
    uint8_t size = i.ReadU8();
 
    NS_ABORT_IF(size != 4);
    m_mss = i.ReadNtohU16();
 
    return GetSerializedSize();
}
 
uint8_t
TcpOptionMSS::GetKind() const
{
    return TcpOption::MSS;
}
 
uint16_t
TcpOptionMSS::GetMSS() const
{
    return m_mss;
}
 
void
TcpOptionMSS::SetMSS(uint16_t mss)
{
    m_mss = mss;
}
 
} // namespace ns3