org.jnetpcap.protocol.lan
Class SLL

java.lang.Object
  org.jnetpcap.nio.JMemory
      org.jnetpcap.nio.JBuffer
          org.jnetpcap.packet.JHeader
              org.jnetpcap.protocol.lan.SLL

All Implemented Interfaces:

JPayloadAccessor

@Header(length=16,
        suite=LAN,
        description="Linux Cooked Capture")
public class SLL
extends JHeader

For captures on Linux cooked sockets, we construct a fake header that includes: a 2-byte "packet type" which is one of: LINUX_SLL_HOST packet was sent to us LINUX_SLL_BROADCAST packet was broadcast LINUX_SLL_MULTICAST packet was multicast LINUX_SLL_OTHERHOST packet was sent to somebody else LINUX_SLL_OUTGOING packet was sent *by* us; a 2-byte Ethernet protocol field; a 2-byte link-layer type; a 2-byte link-layer address length; an 8-byte source link-layer address, whose actual length is specified by the previous value. All fields except for the link-layer address are in network byte order. DO NOT change the layout of this structure, or change any of the LINUX_SLL_ values below. If you must change the link-layer header for a "cooked" Linux capture, introduce a new DLT_ type (ask "tcpdump-workers@lists.tcpdump.org" for one, so that you don't give it a value that collides with a value already being used), and use the new header in captures of that type, so that programs that can handle DLT_LINUX_SLL captures will continue to handle them correctly without any change, and so that capture files with different headers can be told apart and programs that read them can dissect the packets in them.

Author:

Mark Bednarczyk, Sly Technologies, Inc.

  #define SLL_HDR_LEN   16                        // total header length
  #define SLL_ADDRLEN   8                           // length of address field
 
  struct sll_header {
    u_int16_t   sll_pkttype;              // packet type
    u_int16_t   sll_hatype;                 // link-layer address type
    u_int16_t   sll_halen;                  // link-layer address length
    u_int8_t    sll_addr[SLL_ADDRLEN];  // link-layer address
    u_int16_t   sll_protocol;           // protocol
  };
 
 

Nested Class Summary

static class

SLL.HardwareAddressType The Enum HardwareAddressType.

Nested classes/interfaces inherited from class org.jnetpcap.packet.JHeader

JHeader.State

Nested classes/interfaces inherited from class org.jnetpcap.nio.JMemory

JMemory.Type

Field Summary

static int	ID Constant numerial ID for this protocol's header.
static int	LINUX_SLL_BROADCAST The Constant LINUX_SLL_BROADCAST.
static int	LINUX_SLL_HOST The Constant LINUX_SLL_HOST.
static int	LINUX_SLL_MULTICAST The Constant LINUX_SLL_MULTICAST.
static int	LINUX_SLL_OTHERHOST The Constant LINUX_SLL_OTHERHOST.
static int	LINUX_SLL_OUTGOING The Constant LINUX_SLL_OUTGOING.
static int	SLL_HDR_LEN The Constant SLL_HDR_LEN.

Fields inherited from class org.jnetpcap.packet.JHeader

annotatedHeader, BYTE, EMPTY_HEADER_ARRAY, isSubHeader, packet, state

Fields inherited from class org.jnetpcap.nio.JMemory

JNETPCAP_LIBRARY_NAME, MAX_DIRECT_MEMORY_DEFAULT, POINTER

Constructor Summary

SLL()

Method Summary

byte[]	address() Link layer address.
int	addressLength() Link Layer address length.
int	haLength() Link Layer address length.
int	haType() Link Layer address type.
SLL.HardwareAddressType	haTypeEnum() Ha type enum.
int	packetType() Packet type.
int	type() next protocol.
Ethernet.EthernetType	typeEnum() Next protocol as an EtherType constant.

Methods inherited from class org.jnetpcap.packet.JHeader

decode, decodeHeader, getAnnotatedHeader, getDescription, getFields, getGap, getGapLength, getGapOffset, getHeader, getHeaderLength, getHeaderOffset, getId, getIndex, getLength, getName, getNextHeaderId, getNextHeaderOffset, getNicname, getOffset, getPacket, getParent, getPayload, getPayloadLength, getPayloadOffset, getPostfix, getPostfixLength, getPostfixOffset, getPrefix, getPrefixLength, getPrefixOffset, getPreviousHeaderId, getPreviousHeaderOffset, getState, getSubHeaders, hasDescription, hasGap, hasNextHeader, hasPayload, hasPostfix, hasPrefix, hasPreviousHeader, hasSubHeaders, isFragmented, isGapTruncated, isHeaderTruncated, isPayloadTruncated, isPostfixTruncated, isPrefixTruncated, peer, peer, peerPayloadTo, setPacket, setSubHeaders, sizeof, toString, transferPayloadTo, transferPayloadTo, transferPayloadTo, validateHeader

Methods inherited from class org.jnetpcap.nio.JBuffer

findUTF8String, getByte, getByteArray, getByteArray, getByteArray, getDouble, getFloat, getInt, getLong, getShort, getUByte, getUInt, getUShort, getUTF8Char, getUTF8String, getUTF8String, getUTF8String, getUTF8String, isReadonly, order, order, peer, peer, peer, peer, setByte, setByteArray, setByteBuffer, setDouble, setFloat, setInt, setLong, setShort, setShort0, setUByte, setUInt, setUShort, transferFrom, transferFrom, transferFrom, transferTo, transferTo, transferTo

Methods inherited from class org.jnetpcap.nio.JMemory

availableDirectMemory, check, cleanup, createReference, isInitialized, isJMemoryBasedOwner, isOwner, maxDirectMemory, peer, reservedDirectMemory, setSize, size, softDirectMemory, toDebugString, toHexdump, toHexdump, totalActiveAllocated, totalAllocateCalls, totalAllocated, totalAllocatedSegments0To255Bytes, totalAllocatedSegments256OrAbove, totalDeAllocateCalls, totalDeAllocated, transferFrom, transferFrom, transferFromDirect, transferOwnership, transferTo, transferTo, transferTo, transferTo, transferTo, transferTo0

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

SLL_HDR_LEN

public static final int SLL_HDR_LEN

The Constant SLL_HDR_LEN.

See Also:

Constant Field Values

LINUX_SLL_HOST

public static final int LINUX_SLL_HOST

The Constant LINUX_SLL_HOST.

See Also:

Constant Field Values

LINUX_SLL_BROADCAST

public static final int LINUX_SLL_BROADCAST

The Constant LINUX_SLL_BROADCAST.

See Also:

Constant Field Values

LINUX_SLL_MULTICAST

public static final int LINUX_SLL_MULTICAST

The Constant LINUX_SLL_MULTICAST.

See Also:

Constant Field Values

LINUX_SLL_OTHERHOST

public static final int LINUX_SLL_OTHERHOST

The Constant LINUX_SLL_OTHERHOST.

See Also:

Constant Field Values

LINUX_SLL_OUTGOING

public static final int LINUX_SLL_OUTGOING

The Constant LINUX_SLL_OUTGOING.

See Also:

Constant Field Values

ID

public static int ID

Constant numerial ID for this protocol's header.

Constructor Detail

SLL

public SLL()

Method Detail

packetType

@Field(offset=0,
       length=16)
public int packetType()

Packet type.

Returns:

packet type

haType

@Field(offset=16,
       length=16)
public int haType()

Link Layer address type.

Returns:

address type

haTypeEnum

public SLL.HardwareAddressType haTypeEnum()

Ha type enum.

Returns:

the hardware address type

haLength

@Field(offset=32,
       length=16)
public int haLength()

Link Layer address length.

Returns:

address length in bytes

addressLength

@Dynamic(value=LENGTH)
public int addressLength()

Link Layer address length.

Returns:

address length in bits

address

@Field(offset=48,
       format="#mac#")
public byte[] address()

Link layer address.

Returns:

address

type

@Field(offset=112,
       length=16,
       format="%x")
public int type()

next protocol.

Returns:

next protocol

typeEnum

public Ethernet.EthernetType typeEnum()

Next protocol as an EtherType constant.

Returns:

next protocol