sflow

Documentation

Overview

Package sflow decodes sFlow packets

Index

• Constants
• type ExtSwitchData
• type FlowSample
• type Message
• type SFDatagram
• type SFDecoder
  • func NewSFDecoder(r io.ReadSeeker, f []uint32) SFDecoder
  • func (d *SFDecoder) SFDecode() ([]interface{}, error)
• type SFSampledHeader
• type SampledHeader

Constants

const (
	// DataFlowSample defines packet flow sampling
	DataFlowSample = 1

	// DataCounterSample defines counter sampling
	DataCounterSample = 2
)

const (
	// SFDataRawHeader is sFlow Raw Packet Header number
	SFDataRawHeader = 1

	// SFDataExtSwitch is sFlow Extended Switch Data number
	SFDataExtSwitch = 1001
)

Types

type ExtSwitchData

type ExtSwitchData struct {
	SrcVlan     uint32 // The 802.1Q VLAN id of incoming frame
	SrcPriority uint32 // The 802.1p priority of incoming frame
	DstVlan     uint32 // The 802.1Q VLAN id of outgoing frame
	DstPriority uint32 // The 802.1p priority of outgoing frame
}

ExtSwitchData represents Extended Switch Data

type FlowSample

type FlowSample struct {
	SequenceNo   uint32 // Incremented with each flow sample
	SourceID     byte   // sfSourceID
	SamplingRate uint32 // sfPacketSamplingRate
	SamplePool   uint32 // Total number of packets that could have been sampled
	Drops        uint32 // Number of times a packet was dropped due to lack of resources
	Input        uint32 // SNMP ifIndex of input interface
	Output       uint32 // SNMP ifIndex of input interface
	RecordsNo    uint32 // Number of records to follow
}

FlowSample represents single flow sample

type Message

type Message struct {
	Header    *SFDatagram
	ExtSWData *ExtSwitchData
	Sample    *FlowSample
	Packet    *packet.Packet
}

Message represents flow sample decoded packet

type SFDatagram

type SFDatagram struct {
	Version    uint32 // Datagram version
	IPVersion  uint32 // Data gram sFlow version
	AgentSubID uint32 // Identifies a source of sFlow data
	SequenceNo uint32 // Sequence of sFlow Datagrams
	SysUpTime  uint32 // Current time (in milliseconds since device last booted
	SamplesNo  uint32 // Number of samples

	IPAddress net.IP // Agent IP address
}

SFDatagram represents sFlow datagram

type SFDecoder

type SFDecoder struct {
	// contains filtered or unexported fields
}

SFDecoder represents sFlow decoder

func NewSFDecoder

func NewSFDecoder(r io.ReadSeeker, f []uint32) SFDecoder

NewSFDecoder constructs new sflow decoder

func (*SFDecoder) SFDecode

func (d *SFDecoder) SFDecode() ([]interface{}, error)

SFDecode decodes sFlow data

type SFSampledHeader

type SFSampledHeader struct {
	HeaderProtocol uint32 // (enum SFHeaderProtocol)
	FrameLength    uint32 // Original length of packet before sampling
	Stripped       uint32 // Header/trailer bytes stripped by sender
	HeaderLength   uint32 // Length of sampled header bytes to follow
	HeaderBytes    []byte // Header bytes
}

SFSampledHeader represents sFlow sample header

type SampledHeader

type SampledHeader struct {
	Protocol     uint32 // (enum SFLHeader_protocol)
	FrameLength  uint32 // Original length of packet before sampling
	Stripped     uint32 // Header/trailer bytes stripped by sender
	HeaderLength uint32 // Length of sampled header bytes to follow
	Header       []byte // Header bytes
}

SampledHeader represents sampled header