java.lang.Object
- org.pcap4j.packet.AbstractPacket.AbstractHeader
- - org.pcap4j.packet.IpV4Packet.IpV4Header

All Implemented Interfaces:

java.io.Serializable, IpPacket.IpHeader, Packet.Header

Enclosing class:

IpV4Packet
```
public static final class IpV4Packet.IpV4Header
extends AbstractPacket.AbstractHeader
implements IpPacket.IpHeader
```
Since:

pcap4j 0.9.1

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`private boolean`	`dontFragmentFlag`
`private static int`	`DST_ADDR_OFFSET`
`private static int`	`DST_ADDR_SIZE`
`private java.net.Inet4Address`	`dstAddr`
`private static int`	`FLAGS_AND_FRAGMENT_OFFSET_OFFSET`
`private static int`	`FLAGS_AND_FRAGMENT_OFFSET_SIZE`
`private short`	`fragmentOffset`
`private static int`	`HEADER_CHECKSUM_OFFSET`
`private static int`	`HEADER_CHECKSUM_SIZE`
`private short`	`headerChecksum`
`private short`	`identification`
`private static int`	`IDENTIFICATION_OFFSET`
`private static int`	`IDENTIFICATION_SIZE`
`private byte`	`ihl`
`private static org.slf4j.Logger`	`logger`
`private static int`	`MIN_IPV4_HEADER_SIZE`
`private boolean`	`moreFragmentFlag`
`private java.util.List<IpV4Packet.IpV4Option>`	`options`
`private static int`	`OPTIONS_OFFSET`
`private byte[]`	`padding`
`private IpNumber`	`protocol`
`private static int`	`PROTOCOL_OFFSET`
`private static int`	`PROTOCOL_SIZE`
`private boolean`	`reservedFlag`
`private static long`	`serialVersionUID`
`private static int`	`SRC_ADDR_OFFSET`
`private static int`	`SRC_ADDR_SIZE`
`private java.net.Inet4Address`	`srcAddr`
`private IpV4Packet.IpV4Tos`	`tos`
`private static int`	`TOS_OFFSET`
`private static int`	`TOS_SIZE`
`private static int`	`TOTAL_LENGTH_OFFSET`
`private static int`	`TOTAL_LENGTH_SIZE`
`private short`	`totalLength`
`private byte`	`ttl`
`private static int`	`TTL_OFFSET`
`private static int`	`TTL_SIZE`
`private IpVersion`	`version`
`private static int`	`VERSION_AND_IHL_OFFSET`
`private static int`	`VERSION_AND_IHL_SIZE`

Constructor Summary

Constructors
Modifier	Constructor	Description
`private`	`IpV4Header(byte[] rawData, int offset, int length)`
`private`	`IpV4Header(IpV4Packet.Builder builder, Packet payload)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`private byte[]`	`buildRawData(boolean zeroInsteadOfChecksum)`
`protected java.lang.String`	`buildString()`	This method builds the value `toString()` will return.
`protected int`	`calcHashCode()`	This method builds the value `hashCode()` will return using the byte array `getRawData()` returns.
`private short`	`calcHeaderChecksum(boolean zeroInsteadOfChecksum)`
`protected int`	`calcLength()`	This method calculates the value `length()` will return by adding up the lengths of byte arrays in the list `getRawFields()` returns.
`boolean`	`equals(java.lang.Object obj)`	Indicates whether some other object is "equal to" this one using return values of `getRawData()`.
`boolean`	`getDontFragmentFlag()`
`java.net.Inet4Address`	`getDstAddr()`
`short`	`getFragmentOffset()`
`short`	`getHeaderChecksum()`
`short`	`getIdentification()`
`int`	`getIdentificationAsInt()`
`byte`	`getIhl()`
`int`	`getIhlAsInt()`
`boolean`	`getMoreFragmentFlag()`
`java.util.List<IpV4Packet.IpV4Option>`	`getOptions()`
`byte[]`	`getPadding()`
`IpNumber`	`getProtocol()`
`protected java.util.List<byte[]>`	`getRawFields()`	Returns a list of byte arrays which represents this header's fields.
`private java.util.List<byte[]>`	`getRawFields(boolean zeroInsteadOfChecksum)`
`boolean`	`getReservedFlag()`
`java.net.Inet4Address`	`getSrcAddr()`
`IpV4Packet.IpV4Tos`	`getTos()`
`short`	`getTotalLength()`
`int`	`getTotalLengthAsInt()`
`byte`	`getTtl()`
`int`	`getTtlAsInt()`
`IpVersion`	`getVersion()`
`boolean`	`hasValidChecksum(boolean acceptZero)`
`private int`	`measureLengthWithoutPadding()`

Methods inherited from class org.pcap4j.packet.AbstractPacket.AbstractHeader
buildHexString, buildRawData, getRawData, hashCode, length, toHexString, toString

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.pcap4j.packet.Packet.Header
getRawData, length

- Field Detail
  - serialVersionUID
```
private static final long serialVersionUID
```
    See Also:
    
    Constant Field Values
  - logger
```
private static final org.slf4j.Logger logger
```
  - VERSION_AND_IHL_OFFSET
```
private static final int VERSION_AND_IHL_OFFSET
```
    See Also:
    
    Constant Field Values
  - VERSION_AND_IHL_SIZE
```
private static final int VERSION_AND_IHL_SIZE
```
    See Also:
    
    Constant Field Values
  - TOS_OFFSET
```
private static final int TOS_OFFSET
```
    See Also:
    
    Constant Field Values
  - TOS_SIZE
```
private static final int TOS_SIZE
```
    See Also:
    
    Constant Field Values
  - TOTAL_LENGTH_OFFSET
```
private static final int TOTAL_LENGTH_OFFSET
```
    See Also:
    
    Constant Field Values
  - TOTAL_LENGTH_SIZE
```
private static final int TOTAL_LENGTH_SIZE
```
    See Also:
    
    Constant Field Values
  - IDENTIFICATION_OFFSET
```
private static final int IDENTIFICATION_OFFSET
```
    See Also:
    
    Constant Field Values
  - IDENTIFICATION_SIZE
```
private static final int IDENTIFICATION_SIZE
```
    See Also:
    
    Constant Field Values
  - FLAGS_AND_FRAGMENT_OFFSET_OFFSET
```
private static final int FLAGS_AND_FRAGMENT_OFFSET_OFFSET
```
    See Also:
    
    Constant Field Values
  - FLAGS_AND_FRAGMENT_OFFSET_SIZE
```
private static final int FLAGS_AND_FRAGMENT_OFFSET_SIZE
```
    See Also:
    
    Constant Field Values
  - TTL_OFFSET
```
private static final int TTL_OFFSET
```
    See Also:
    
    Constant Field Values
  - TTL_SIZE
```
private static final int TTL_SIZE
```
    See Also:
    
    Constant Field Values
  - PROTOCOL_OFFSET
```
private static final int PROTOCOL_OFFSET
```
    See Also:
    
    Constant Field Values
  - PROTOCOL_SIZE
```
private static final int PROTOCOL_SIZE
```
    See Also:
    
    Constant Field Values
  - HEADER_CHECKSUM_OFFSET
```
private static final int HEADER_CHECKSUM_OFFSET
```
    See Also:
    
    Constant Field Values
  - HEADER_CHECKSUM_SIZE
```
private static final int HEADER_CHECKSUM_SIZE
```
    See Also:
    
    Constant Field Values
  - SRC_ADDR_OFFSET
```
private static final int SRC_ADDR_OFFSET
```
    See Also:
    
    Constant Field Values
  - SRC_ADDR_SIZE
```
private static final int SRC_ADDR_SIZE
```
    See Also:
    
    Constant Field Values
  - DST_ADDR_OFFSET
```
private static final int DST_ADDR_OFFSET
```
    See Also:
    
    Constant Field Values
  - DST_ADDR_SIZE
```
private static final int DST_ADDR_SIZE
```
    See Also:
    
    Constant Field Values
  - OPTIONS_OFFSET
```
private static final int OPTIONS_OFFSET
```
    See Also:
    
    Constant Field Values
  - MIN_IPV4_HEADER_SIZE
```
private static final int MIN_IPV4_HEADER_SIZE
```
    See Also:
    
    Constant Field Values
  - version
```
private final IpVersion version
```
  - ihl
```
private final byte ihl
```
  - tos
```
private final IpV4Packet.IpV4Tos tos
```
  - totalLength
```
private final short totalLength
```
  - identification
```
private final short identification
```
  - reservedFlag
```
private final boolean reservedFlag
```
  - dontFragmentFlag
```
private final boolean dontFragmentFlag
```
  - moreFragmentFlag
```
private final boolean moreFragmentFlag
```
  - fragmentOffset
```
private final short fragmentOffset
```
  - ttl
```
private final byte ttl
```
  - protocol
```
private final IpNumber protocol
```
  - headerChecksum
```
private final short headerChecksum
```
  - srcAddr
```
private final java.net.Inet4Address srcAddr
```
  - dstAddr
```
private final java.net.Inet4Address dstAddr
```
  - options
```
private final java.util.List<IpV4Packet.IpV4Option> options
```
  - padding
```
private final byte[] padding
```
- Constructor Detail
  - IpV4Header
```
private IpV4Header(byte[] rawData,
                   int offset,
                   int length)
            throws IllegalRawDataException
```
    Throws:
    
    IllegalRawDataException
  - IpV4Header
```
private IpV4Header(IpV4Packet.Builder builder,
                   Packet payload)
```
- Method Detail
  - calcHeaderChecksum
```
private short calcHeaderChecksum(boolean zeroInsteadOfChecksum)
```
  - getVersion
```
public IpVersion getVersion()
```
    Specified by:
    
    getVersion in interface IpPacket.IpHeader
    
    Returns:
    
    version
  - getIhl
```
public byte getIhl()
```
    Returns:
    
    ihl
  - getIhlAsInt
```
public int getIhlAsInt()
```
    Returns:
    
    ihl
  - getTos
```
public IpV4Packet.IpV4Tos getTos()
```
    Returns:
    
    tos
  - getTotalLength
```
public short getTotalLength()
```
    Returns:
    
    totalLength
  - getTotalLengthAsInt
```
public int getTotalLengthAsInt()
```
    Returns:
    
    totalLength
  - getIdentification
```
public short getIdentification()
```
    Returns:
    
    identification
  - getIdentificationAsInt
```
public int getIdentificationAsInt()
```
    Returns:
    
    identification
  - getReservedFlag
```
public boolean getReservedFlag()
```
    Returns:
    
    reservedFlag
  - getDontFragmentFlag
```
public boolean getDontFragmentFlag()
```
    Returns:
    
    dontFragmentFlag
  - getMoreFragmentFlag
```
public boolean getMoreFragmentFlag()
```
    Returns:
    
    moreFragmentFlag
  - getFragmentOffset
```
public short getFragmentOffset()
```
    Returns:
    
    fragmentOffset
  - getTtl
```
public byte getTtl()
```
    Returns:
    
    ttl
  - getTtlAsInt
```
public int getTtlAsInt()
```
    Returns:
    
    ttl
  - getProtocol
```
public IpNumber getProtocol()
```
    Specified by:
    
    getProtocol in interface IpPacket.IpHeader
    
    Returns:
    
    an IpNumber object which indicates the protocol of the following header.
  - getHeaderChecksum
```
public short getHeaderChecksum()
```
    Returns:
    
    headerChecksum
  - getSrcAddr
```
public java.net.Inet4Address getSrcAddr()
```
    Specified by:
    
    getSrcAddr in interface IpPacket.IpHeader
    
    Returns:
    
    srcAddr
  - getDstAddr
```
public java.net.Inet4Address getDstAddr()
```
    Specified by:
    
    getDstAddr in interface IpPacket.IpHeader
    
    Returns:
    
    dstAddr
  - getOptions
```
public java.util.List<IpV4Packet.IpV4Option> getOptions()
```
    Returns:
    
    options
  - getPadding
```
public byte[] getPadding()
```
    Returns:
    
    padding
  - hasValidChecksum
```
public boolean hasValidChecksum(boolean acceptZero)
```
    Parameters:
    
    acceptZero - acceptZero
    
    Returns:
    
    true if the packet represented by this object has a valid checksum; false otherwise.
  - getRawFields
```
protected java.util.List<byte[]> getRawFields()
```
    Description copied from class: AbstractPacket.AbstractHeader
    
    Returns a list of byte arrays which represents this header's fields. This method is called by calcLength() and buildRawData().
    
    Specified by:
    
    getRawFields in class AbstractPacket.AbstractHeader
    
    Returns:
    
    a list of byte arrays which represents this header's fields
  - getRawFields
```
private java.util.List<byte[]> getRawFields(boolean zeroInsteadOfChecksum)
```
  - buildRawData
```
private byte[] buildRawData(boolean zeroInsteadOfChecksum)
```
  - measureLengthWithoutPadding
```
private int measureLengthWithoutPadding()
```
  - calcLength
```
protected int calcLength()
```
    Description copied from class: AbstractPacket.AbstractHeader
    
    This method calculates the value length() will return by adding up the lengths of byte arrays in the list getRawFields() returns.
    
    Overrides:
    
    calcLength in class AbstractPacket.AbstractHeader
    
    Returns:
    
    a calculated length
  - buildString
```
protected java.lang.String buildString()
```
    Description copied from class: AbstractPacket.AbstractHeader
    
    This method builds the value toString() will return.
    
    Overrides:
    
    buildString in class AbstractPacket.AbstractHeader
    
    Returns:
    
    a string representation of this object
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Description copied from class: AbstractPacket.AbstractHeader
    
    Indicates whether some other object is "equal to" this one using return values of getRawData(). This method should be overridden so that it does more strict comparisons more efficiently.
    
    Overrides:
    
    equals in class AbstractPacket.AbstractHeader
  - calcHashCode
```
protected int calcHashCode()
```
    Description copied from class: AbstractPacket.AbstractHeader
    
    This method builds the value hashCode() will return using the byte array getRawData() returns. This method may be better to be overridden for performance reason.
    
    Overrides:
    
    calcHashCode in class AbstractPacket.AbstractHeader
    
    Returns:
    
    a calculated hash code value for the object

Class IpV4Packet.IpV4Header

Field Summary

Constructor Summary

Method Summary

Methods inherited from class org.pcap4j.packet.AbstractPacket.AbstractHeader

Methods inherited from class java.lang.Object

Methods inherited from interface org.pcap4j.packet.Packet.Header

Field Detail

serialVersionUID

logger

VERSION_AND_IHL_OFFSET

VERSION_AND_IHL_SIZE

TOS_OFFSET

TOS_SIZE

TOTAL_LENGTH_OFFSET

TOTAL_LENGTH_SIZE

IDENTIFICATION_OFFSET

IDENTIFICATION_SIZE

FLAGS_AND_FRAGMENT_OFFSET_OFFSET

FLAGS_AND_FRAGMENT_OFFSET_SIZE

TTL_OFFSET

TTL_SIZE

PROTOCOL_OFFSET

PROTOCOL_SIZE

HEADER_CHECKSUM_OFFSET

HEADER_CHECKSUM_SIZE

SRC_ADDR_OFFSET

SRC_ADDR_SIZE

DST_ADDR_OFFSET

DST_ADDR_SIZE

OPTIONS_OFFSET

MIN_IPV4_HEADER_SIZE

version

ihl

tos

totalLength

identification

reservedFlag

dontFragmentFlag

moreFragmentFlag

fragmentOffset

ttl

protocol

headerChecksum

srcAddr

dstAddr

options

padding

Constructor Detail

IpV4Header

IpV4Header

Method Detail

calcHeaderChecksum

getVersion

getIhl

getIhlAsInt

getTos

getTotalLength

getTotalLengthAsInt

getIdentification

getIdentificationAsInt

getReservedFlag

getDontFragmentFlag

getMoreFragmentFlag

getFragmentOffset

getTtl

getTtlAsInt

getProtocol

getHeaderChecksum

getSrcAddr

getDstAddr

getOptions

getPadding

hasValidChecksum

getRawFields

getRawFields

buildRawData

measureLengthWithoutPadding

calcLength

buildString