ipv4-header.h

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/*
 * Copyright (c) 2005 INRIA
 *
 * 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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 */
 
#ifndef IPV4_HEADER_H
#define IPV4_HEADER_H
 
#include "ns3/header.h"
#include "ns3/ipv4-address.h"
 
namespace ns3
{
class Ipv4Header : public Header
{
  public:
    Ipv4Header();
    void EnableChecksum();
    void SetPayloadSize(uint16_t size);
    void SetIdentification(uint16_t identification);
    void SetTos(uint8_t tos);
 
  public:
    enum DscpType
    {
        DscpDefault = 0x00,
 
        // Prefixed with "DSCP" to avoid name clash (bug 1723)
        DSCP_CS1 = 0x08,  // octal 010
        DSCP_AF11 = 0x0A, // octal 012
        DSCP_AF12 = 0x0C, // octal 014
        DSCP_AF13 = 0x0E, // octal 016
 
        DSCP_CS2 = 0x10,  // octal 020
        DSCP_AF21 = 0x12, // octal 022
        DSCP_AF22 = 0x14, // octal 024
        DSCP_AF23 = 0x16, // octal 026
 
        DSCP_CS3 = 0x18,  // octal 030
        DSCP_AF31 = 0x1A, // octal 032
        DSCP_AF32 = 0x1C, // octal 034
        DSCP_AF33 = 0x1E, // octal 036
 
        DSCP_CS4 = 0x20,  // octal 040
        DSCP_AF41 = 0x22, // octal 042
        DSCP_AF42 = 0x24, // octal 044
        DSCP_AF43 = 0x26, // octal 046
 
        DSCP_CS5 = 0x28, // octal 050
        DSCP_EF = 0x2E,  // octal 056
 
        DSCP_CS6 = 0x30, // octal 060
        DSCP_CS7 = 0x38  // octal 070
    };
 
    void SetDscp(DscpType dscp);
 
    enum EcnType
    {
        // Prefixed with "ECN" to avoid name clash (bug 1723)
        ECN_NotECT = 0x00,
        ECN_ECT1 = 0x01,
        ECN_ECT0 = 0x02,
        ECN_CE = 0x03
    };
 
    void SetEcn(EcnType ecn);
    void SetMoreFragments();
    void SetLastFragment();
    void SetDontFragment();
    void SetMayFragment();
    void SetFragmentOffset(uint16_t offsetBytes);
    void SetTtl(uint8_t ttl);
    void SetProtocol(uint8_t num);
    void SetSource(Ipv4Address source);
    void SetDestination(Ipv4Address destination);
    uint16_t GetPayloadSize() const;
    uint16_t GetIdentification() const;
    uint8_t GetTos() const;
    DscpType GetDscp() const;
    std::string DscpTypeToString(DscpType dscp) const;
    EcnType GetEcn() const;
    std::string EcnTypeToString(EcnType ecn) const;
    bool IsLastFragment() const;
    bool IsDontFragment() const;
    uint16_t GetFragmentOffset() const;
    uint8_t GetTtl() const;
    uint8_t GetProtocol() const;
    Ipv4Address GetSource() const;
    Ipv4Address GetDestination() const;
 
    bool IsChecksumOk() const;
 
    static TypeId GetTypeId();
    TypeId GetInstanceTypeId() const override;
    void Print(std::ostream& os) const override;
    uint32_t GetSerializedSize() const override;
    void Serialize(Buffer::Iterator start) const override;
    uint32_t Deserialize(Buffer::Iterator start) override;
 
  private:
    enum FlagsE
    {
        DONT_FRAGMENT = (1 << 0),
        MORE_FRAGMENTS = (1 << 1)
    };
 
    bool m_calcChecksum; 
 
    uint16_t m_payloadSize;    
    uint16_t m_identification; 
    uint32_t m_tos : 8;        
    uint32_t m_ttl : 8;        
    uint32_t m_protocol : 8;   
    uint32_t m_flags : 3;      
    uint16_t m_fragmentOffset; 
    Ipv4Address m_source;      
    Ipv4Address m_destination; 
    uint16_t m_checksum;       
    bool m_goodChecksum;       
    uint16_t m_headerSize;     
};
 
} // namespace ns3
 
#endif /* IPV4_HEADER_H */