vendor/github.com/google/gopacket/layers/sflow.go - voltha-go-controller - Gitiles

 // Copyright 2014 Google, Inc. All rights reserved.
 //
 // Use of this source code is governed by a BSD-style license
 // that can be found in the LICENSE file in the root of the source
 // tree.

 /*
 This layer decodes SFlow version 5 datagrams.

 The specification can be found here: http://sflow.org/sflow_version_5.txt

 Additional developer information about sflow can be found at:
 http://sflow.org/developers/specifications.php

 And SFlow in general:
 http://sflow.org/index.php

 Two forms of sample data are defined: compact and expanded. The
 Specification has this to say:

     Compact and expand forms of counter and flow samples are defined.
     An agent must not mix compact/expanded encodings.  If an agent
     will never use ifIndex numbers >= 2^24 then it must use compact
     encodings for all interfaces.  Otherwise the expanded formats must
     be used for all interfaces.

 This decoder only supports the compact form, because that is the only
 one for which data was available.

 The datagram is composed of one or more samples of type flow or counter,
 and each sample is composed of one or more records describing the sample.
 A sample is a single instance of sampled inforamtion, and each record in
 the sample gives additional / supplimentary information about the sample.

 The following sample record types are supported:

 	Raw Packet Header
 	opaque = flow_data; enterprise = 0; format = 1

 	Extended Switch Data
 	opaque = flow_data; enterprise = 0; format = 1001

 	Extended Router Data
 	opaque = flow_data; enterprise = 0; format = 1002

 	Extended Gateway Data
 	opaque = flow_data; enterprise = 0; format = 1003

 	Extended User Data
 	opaque = flow_data; enterprise = 0; format = 1004

 	Extended URL Data
 	opaque = flow_data; enterprise = 0; format = 1005

 The following types of counter records are supported:

 	Generic Interface Counters - see RFC 2233
 	opaque = counter_data; enterprise = 0; format = 1

 	Ethernet Interface Counters - see RFC 2358
 	opaque = counter_data; enterprise = 0; format = 2

 SFlow is encoded using XDR (RFC4506). There are a few places
 where the standard 4-byte fields are partitioned into two
 bitfields of different lengths. I'm not sure why the designers
 chose to pack together two values like this in some places, and
 in others they use the entire 4-byte value to store a number that
 will never be more than a few bits. In any case, there are a couple
 of types defined to handle the decoding of these bitfields, and
 that's why they're there. */

 package layers

 import (
 	"encoding/binary"
 	"errors"
 	"fmt"
 	"net"

 	"github.com/google/gopacket"
 )

 // SFlowRecord holds both flow sample records and counter sample records.
 // A Record is the structure that actually holds the sampled data
 // and / or counters.
 type SFlowRecord interface {
 }

 // SFlowDataSource encodes a 2-bit SFlowSourceFormat in its most significant
 // 2 bits, and an SFlowSourceValue in its least significant 30 bits.
 // These types and values define the meaning of the inteface information
 // presented in the sample metadata.
 type SFlowDataSource int32

 func (sdc SFlowDataSource) decode() (SFlowSourceFormat, SFlowSourceValue) {
 	leftField := sdc >> 30
 	rightField := uint32(0x3FFFFFFF) & uint32(sdc)
 	return SFlowSourceFormat(leftField), SFlowSourceValue(rightField)
 }

 type SFlowDataSourceExpanded struct {
 	SourceIDClass SFlowSourceFormat
 	SourceIDIndex SFlowSourceValue
 }

 func (sdce SFlowDataSourceExpanded) decode() (SFlowSourceFormat, SFlowSourceValue) {
 	leftField := sdce.SourceIDClass >> 30
 	rightField := uint32(0x3FFFFFFF) & uint32(sdce.SourceIDIndex)
 	return SFlowSourceFormat(leftField), SFlowSourceValue(rightField)
 }

 type SFlowSourceFormat uint32

 type SFlowSourceValue uint32

 const (
 	SFlowTypeSingleInterface      SFlowSourceFormat = 0
 	SFlowTypePacketDiscarded      SFlowSourceFormat = 1
 	SFlowTypeMultipleDestinations SFlowSourceFormat = 2
 )

 func (sdf SFlowSourceFormat) String() string {
 	switch sdf {
 	case SFlowTypeSingleInterface:
 		return "Single Interface"
 	case SFlowTypePacketDiscarded:
 		return "Packet Discarded"
 	case SFlowTypeMultipleDestinations:
 		return "Multiple Destinations"
 	default:
 		return "UNKNOWN"
 	}
 }

 func decodeSFlow(data []byte, p gopacket.PacketBuilder) error {
 	s := &SFlowDatagram{}
 	err := s.DecodeFromBytes(data, p)
 	if err != nil {
 		return err
 	}
 	p.AddLayer(s)
 	p.SetApplicationLayer(s)
 	return nil
 }

 // SFlowDatagram is the outermost container which holds some basic information
 // about the reporting agent, and holds at least one sample record
 type SFlowDatagram struct {
 	BaseLayer

 	DatagramVersion uint32
 	AgentAddress    net.IP
 	SubAgentID      uint32
 	SequenceNumber  uint32
 	AgentUptime     uint32
 	SampleCount     uint32
 	FlowSamples     []SFlowFlowSample
 	CounterSamples  []SFlowCounterSample
 }

 // An SFlow  datagram's outer container has the following
 // structure:

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |           int sFlow version (2|4|5)           |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |   int IP version of the Agent (1=v4|2=v6)     |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /    Agent IP address (v4=4byte|v6=16byte)      /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |               int sub agent id                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |         int datagram sequence number          |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |            int switch uptime in ms            |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |          int n samples in datagram            |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /                  n samples                    /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 // SFlowDataFormat encodes the EnterpriseID in the most
 // significant 12 bits, and the SampleType in the least significant
 // 20 bits.
 type SFlowDataFormat uint32

 func (sdf SFlowDataFormat) decode() (SFlowEnterpriseID, SFlowSampleType) {
 	leftField := sdf >> 12
 	rightField := uint32(0xFFF) & uint32(sdf)
 	return SFlowEnterpriseID(leftField), SFlowSampleType(rightField)
 }

 // SFlowEnterpriseID is used to differentiate between the
 // official SFlow standard, and other, vendor-specific
 // types of flow data. (Similiar to SNMP's enterprise MIB
 // OIDs) Only the office SFlow Enterprise ID is decoded
 // here.
 type SFlowEnterpriseID uint32

 const (
 	SFlowStandard SFlowEnterpriseID = 0
 )

 func (eid SFlowEnterpriseID) String() string {
 	switch eid {
 	case SFlowStandard:
 		return "Standard SFlow"
 	default:
 		return ""
 	}
 }

 func (eid SFlowEnterpriseID) GetType() SFlowEnterpriseID {
 	return SFlowStandard
 }

 // SFlowSampleType specifies the type of sample. Only flow samples
 // and counter samples are supported
 type SFlowSampleType uint32

 const (
 	SFlowTypeFlowSample            SFlowSampleType = 1
 	SFlowTypeCounterSample         SFlowSampleType = 2
 	SFlowTypeExpandedFlowSample    SFlowSampleType = 3
 	SFlowTypeExpandedCounterSample SFlowSampleType = 4
 )

 func (st SFlowSampleType) GetType() SFlowSampleType {
 	switch st {
 	case SFlowTypeFlowSample:
 		return SFlowTypeFlowSample
 	case SFlowTypeCounterSample:
 		return SFlowTypeCounterSample
 	case SFlowTypeExpandedFlowSample:
 		return SFlowTypeExpandedFlowSample
 	case SFlowTypeExpandedCounterSample:
 		return SFlowTypeExpandedCounterSample
 	default:
 		panic("Invalid Sample Type")
 	}
 }

 func (st SFlowSampleType) String() string {
 	switch st {
 	case SFlowTypeFlowSample:
 		return "Flow Sample"
 	case SFlowTypeCounterSample:
 		return "Counter Sample"
 	case SFlowTypeExpandedFlowSample:
 		return "Expanded Flow Sample"
 	case SFlowTypeExpandedCounterSample:
 		return "Expanded Counter Sample"
 	default:
 		return ""
 	}
 }

 func (s *SFlowDatagram) LayerType() gopacket.LayerType { return LayerTypeSFlow }

 func (d *SFlowDatagram) Payload() []byte { return nil }

 func (d *SFlowDatagram) CanDecode() gopacket.LayerClass { return LayerTypeSFlow }

 func (d *SFlowDatagram) NextLayerType() gopacket.LayerType { return gopacket.LayerTypePayload }

 // SFlowIPType determines what form the IP address being decoded will
 // take. This is an XDR union type allowing for both IPv4 and IPv6
 type SFlowIPType uint32

 const (
 	SFlowIPv4 SFlowIPType = 1
 	SFlowIPv6 SFlowIPType = 2
 )

 func (s SFlowIPType) String() string {
 	switch s {
 	case SFlowIPv4:
 		return "IPv4"
 	case SFlowIPv6:
 		return "IPv6"
 	default:
 		return ""
 	}
 }

 func (s SFlowIPType) Length() int {
 	switch s {
 	case SFlowIPv4:
 		return 4
 	case SFlowIPv6:
 		return 16
 	default:
 		return 0
 	}
 }

 func (s *SFlowDatagram) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
 	var agentAddressType SFlowIPType

 	data, s.DatagramVersion = data[4:], binary.BigEndian.Uint32(data[:4])
 	data, agentAddressType = data[4:], SFlowIPType(binary.BigEndian.Uint32(data[:4]))
 	data, s.AgentAddress = data[agentAddressType.Length():], data[:agentAddressType.Length()]
 	data, s.SubAgentID = data[4:], binary.BigEndian.Uint32(data[:4])
 	data, s.SequenceNumber = data[4:], binary.BigEndian.Uint32(data[:4])
 	data, s.AgentUptime = data[4:], binary.BigEndian.Uint32(data[:4])
 	data, s.SampleCount = data[4:], binary.BigEndian.Uint32(data[:4])

 	if s.SampleCount < 1 {
 		return fmt.Errorf("SFlow Datagram has invalid sample length: %d", s.SampleCount)
 	}
 	for i := uint32(0); i < s.SampleCount; i++ {
 		sdf := SFlowDataFormat(binary.BigEndian.Uint32(data[:4]))
 		_, sampleType := sdf.decode()
 		switch sampleType {
 		case SFlowTypeFlowSample:
 			if flowSample, err := decodeFlowSample(&data, false); err == nil {
 				s.FlowSamples = append(s.FlowSamples, flowSample)
 			} else {
 				return err
 			}
 		case SFlowTypeCounterSample:
 			if counterSample, err := decodeCounterSample(&data, false); err == nil {
 				s.CounterSamples = append(s.CounterSamples, counterSample)
 			} else {
 				return err
 			}
 		case SFlowTypeExpandedFlowSample:
 			if flowSample, err := decodeFlowSample(&data, true); err == nil {
 				s.FlowSamples = append(s.FlowSamples, flowSample)
 			} else {
 				return err
 			}
 		case SFlowTypeExpandedCounterSample:
 			if counterSample, err := decodeCounterSample(&data, true); err == nil {
 				s.CounterSamples = append(s.CounterSamples, counterSample)
 			} else {
 				return err
 			}

 		default:
 			return fmt.Errorf("Unsupported SFlow sample type %d", sampleType)
 		}
 	}
 	return nil
 }

 // SFlowFlowSample represents a sampled packet and contains
 // one or more records describing the packet
 type SFlowFlowSample struct {
 	EnterpriseID          SFlowEnterpriseID
 	Format                SFlowSampleType
 	SampleLength          uint32
 	SequenceNumber        uint32
 	SourceIDClass         SFlowSourceFormat
 	SourceIDIndex         SFlowSourceValue
 	SamplingRate          uint32
 	SamplePool            uint32
 	Dropped               uint32
 	InputInterfaceFormat  uint32
 	InputInterface        uint32
 	OutputInterfaceFormat uint32
 	OutputInterface       uint32
 	RecordCount           uint32
 	Records               []SFlowRecord
 }

 // Flow samples have the following structure. Note
 // the bit fields to encode the Enterprise ID and the
 // Flow record format: type 1

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  sample length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |          int sample sequence number           |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |id type |       src id index value             |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |               int sampling rate               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                int sample pool                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    int drops                  |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                 int input ifIndex             |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                int output ifIndex             |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |               int number of records           |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /                   flow records                /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 // Flow samples have the following structure.
 // Flow record format: type 3

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  sample length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |          int sample sequence number           |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |               int src id type                 |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |             int src id index value            |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |               int sampling rate               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                int sample pool                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    int drops                  |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |           int input interface format          |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |           int input interface value           |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |           int output interface format         |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |           int output interface value          |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |               int number of records           |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /                   flow records                /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 type SFlowFlowDataFormat uint32

 func (fdf SFlowFlowDataFormat) decode() (SFlowEnterpriseID, SFlowFlowRecordType) {
 	leftField := fdf >> 12
 	rightField := uint32(0xFFF) & uint32(fdf)
 	return SFlowEnterpriseID(leftField), SFlowFlowRecordType(rightField)
 }

 func (fs SFlowFlowSample) GetRecords() []SFlowRecord {
 	return fs.Records
 }

 func (fs SFlowFlowSample) GetType() SFlowSampleType {
 	return SFlowTypeFlowSample
 }

 func skipRecord(data *[]byte) {
 	recordLength := int(binary.BigEndian.Uint32((*data)[4:]))
 	*data = (*data)[(recordLength+((4-recordLength)%4))+8:]
 }

 func decodeFlowSample(data *[]byte, expanded bool) (SFlowFlowSample, error) {
 	s := SFlowFlowSample{}
 	var sdf SFlowDataFormat
 	*data, sdf = (*data)[4:], SFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	var sdc SFlowDataSource

 	s.EnterpriseID, s.Format = sdf.decode()
 	if len(*data) < 4 {
 		return SFlowFlowSample{}, errors.New("ethernet counters too small")
 	}
 	*data, s.SampleLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowFlowSample{}, errors.New("ethernet counters too small")
 	}
 	*data, s.SequenceNumber = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if expanded {
 		if len(*data) < 4 {
 			return SFlowFlowSample{}, errors.New("ethernet counters too small")
 		}
 		*data, s.SourceIDClass = (*data)[4:], SFlowSourceFormat(binary.BigEndian.Uint32((*data)[:4]))
 		if len(*data) < 4 {
 			return SFlowFlowSample{}, errors.New("ethernet counters too small")
 		}
 		*data, s.SourceIDIndex = (*data)[4:], SFlowSourceValue(binary.BigEndian.Uint32((*data)[:4]))
 	} else {
 		if len(*data) < 4 {
 			return SFlowFlowSample{}, errors.New("ethernet counters too small")
 		}
 		*data, sdc = (*data)[4:], SFlowDataSource(binary.BigEndian.Uint32((*data)[:4]))
 		s.SourceIDClass, s.SourceIDIndex = sdc.decode()
 	}
 	if len(*data) < 4 {
 		return SFlowFlowSample{}, errors.New("ethernet counters too small")
 	}
 	*data, s.SamplingRate = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowFlowSample{}, errors.New("ethernet counters too small")
 	}
 	*data, s.SamplePool = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowFlowSample{}, errors.New("ethernet counters too small")
 	}
 	*data, s.Dropped = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	if expanded {
 		if len(*data) < 4 {
 			return SFlowFlowSample{}, errors.New("ethernet counters too small")
 		}
 		*data, s.InputInterfaceFormat = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 		if len(*data) < 4 {
 			return SFlowFlowSample{}, errors.New("ethernet counters too small")
 		}
 		*data, s.InputInterface = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 		if len(*data) < 4 {
 			return SFlowFlowSample{}, errors.New("ethernet counters too small")
 		}
 		*data, s.OutputInterfaceFormat = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 		if len(*data) < 4 {
 			return SFlowFlowSample{}, errors.New("ethernet counters too small")
 		}
 		*data, s.OutputInterface = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	} else {
 		if len(*data) < 4 {
 			return SFlowFlowSample{}, errors.New("ethernet counters too small")
 		}
 		*data, s.InputInterface = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 		if len(*data) < 4 {
 			return SFlowFlowSample{}, errors.New("ethernet counters too small")
 		}
 		*data, s.OutputInterface = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	}
 	if len(*data) < 4 {
 		return SFlowFlowSample{}, errors.New("ethernet counters too small")
 	}
 	*data, s.RecordCount = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	for i := uint32(0); i < s.RecordCount; i++ {
 		rdf := SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 		enterpriseID, flowRecordType := rdf.decode()

 		// Try to decode when EnterpriseID is 0 signaling
 		// default sflow structs are used according specification
 		// Unexpected behavior detected for e.g. with pmacct
 		if enterpriseID == 0 {
 			switch flowRecordType {
 			case SFlowTypeRawPacketFlow:
 				if record, err := decodeRawPacketFlowRecord(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeExtendedUserFlow:
 				if record, err := decodeExtendedUserFlow(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeExtendedUrlFlow:
 				if record, err := decodeExtendedURLRecord(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeExtendedSwitchFlow:
 				if record, err := decodeExtendedSwitchFlowRecord(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeExtendedRouterFlow:
 				if record, err := decodeExtendedRouterFlowRecord(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeExtendedGatewayFlow:
 				if record, err := decodeExtendedGatewayFlowRecord(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeEthernetFrameFlow:
 				if record, err := decodeEthernetFrameFlowRecord(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeIpv4Flow:
 				if record, err := decodeSFlowIpv4Record(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeIpv6Flow:
 				if record, err := decodeSFlowIpv6Record(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeExtendedMlpsFlow:
 				// TODO
 				skipRecord(data)
 				return s, errors.New("skipping TypeExtendedMlpsFlow")
 			case SFlowTypeExtendedNatFlow:
 				// TODO
 				skipRecord(data)
 				return s, errors.New("skipping TypeExtendedNatFlow")
 			case SFlowTypeExtendedMlpsTunnelFlow:
 				// TODO
 				skipRecord(data)
 				return s, errors.New("skipping TypeExtendedMlpsTunnelFlow")
 			case SFlowTypeExtendedMlpsVcFlow:
 				// TODO
 				skipRecord(data)
 				return s, errors.New("skipping TypeExtendedMlpsVcFlow")
 			case SFlowTypeExtendedMlpsFecFlow:
 				// TODO
 				skipRecord(data)
 				return s, errors.New("skipping TypeExtendedMlpsFecFlow")
 			case SFlowTypeExtendedMlpsLvpFecFlow:
 				// TODO
 				skipRecord(data)
 				return s, errors.New("skipping TypeExtendedMlpsLvpFecFlow")
 			case SFlowTypeExtendedVlanFlow:
 				// TODO
 				skipRecord(data)
 				return s, errors.New("skipping TypeExtendedVlanFlow")
 			case SFlowTypeExtendedIpv4TunnelEgressFlow:
 				if record, err := decodeExtendedIpv4TunnelEgress(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeExtendedIpv4TunnelIngressFlow:
 				if record, err := decodeExtendedIpv4TunnelIngress(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeExtendedIpv6TunnelEgressFlow:
 				if record, err := decodeExtendedIpv6TunnelEgress(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeExtendedIpv6TunnelIngressFlow:
 				if record, err := decodeExtendedIpv6TunnelIngress(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeExtendedDecapsulateEgressFlow:
 				if record, err := decodeExtendedDecapsulateEgress(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeExtendedDecapsulateIngressFlow:
 				if record, err := decodeExtendedDecapsulateIngress(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeExtendedVniEgressFlow:
 				if record, err := decodeExtendedVniEgress(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			case SFlowTypeExtendedVniIngressFlow:
 				if record, err := decodeExtendedVniIngress(data); err == nil {
 					s.Records = append(s.Records, record)
 				} else {
 					return s, err
 				}
 			default:
 				return s, fmt.Errorf("Unsupported flow record type: %d", flowRecordType)
 			}
 		} else {
 			skipRecord(data)
 		}
 	}
 	return s, nil
 }

 // Counter samples report information about various counter
 // objects. Typically these are items like IfInOctets, or
 // CPU / Memory stats, etc. SFlow will report these at regular
 // intervals as configured on the agent. If one were sufficiently
 // industrious, this could be used to replace the typical
 // SNMP polling used for such things.
 type SFlowCounterSample struct {
 	EnterpriseID   SFlowEnterpriseID
 	Format         SFlowSampleType
 	SampleLength   uint32
 	SequenceNumber uint32
 	SourceIDClass  SFlowSourceFormat
 	SourceIDIndex  SFlowSourceValue
 	RecordCount    uint32
 	Records        []SFlowRecord
 }

 // Counter samples have the following structure:

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |          int sample sequence number           |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |id type |       src id index value             |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |               int number of records           |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /                counter records                /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 type SFlowCounterDataFormat uint32

 func (cdf SFlowCounterDataFormat) decode() (SFlowEnterpriseID, SFlowCounterRecordType) {
 	leftField := cdf >> 12
 	rightField := uint32(0xFFF) & uint32(cdf)
 	return SFlowEnterpriseID(leftField), SFlowCounterRecordType(rightField)
 }

 // GetRecords will return a slice of interface types
 // representing records. A type switch can be used to
 // get at the underlying SFlowCounterRecordType.
 func (cs SFlowCounterSample) GetRecords() []SFlowRecord {
 	return cs.Records
 }

 // GetType will report the type of sample. Only the
 // compact form of counter samples is supported
 func (cs SFlowCounterSample) GetType() SFlowSampleType {
 	return SFlowTypeCounterSample
 }

 type SFlowCounterRecordType uint32

 const (
 	SFlowTypeGenericInterfaceCounters   SFlowCounterRecordType = 1
 	SFlowTypeEthernetInterfaceCounters  SFlowCounterRecordType = 2
 	SFlowTypeTokenRingInterfaceCounters SFlowCounterRecordType = 3
 	SFlowType100BaseVGInterfaceCounters SFlowCounterRecordType = 4
 	SFlowTypeVLANCounters               SFlowCounterRecordType = 5
 	SFlowTypeLACPCounters               SFlowCounterRecordType = 7
 	SFlowTypeProcessorCounters          SFlowCounterRecordType = 1001
 	SFlowTypeOpenflowPortCounters       SFlowCounterRecordType = 1004
 	SFlowTypePORTNAMECounters           SFlowCounterRecordType = 1005
 	SFLowTypeAPPRESOURCESCounters       SFlowCounterRecordType = 2203
 	SFlowTypeOVSDPCounters              SFlowCounterRecordType = 2207
 )

 func (cr SFlowCounterRecordType) String() string {
 	switch cr {
 	case SFlowTypeGenericInterfaceCounters:
 		return "Generic Interface Counters"
 	case SFlowTypeEthernetInterfaceCounters:
 		return "Ethernet Interface Counters"
 	case SFlowTypeTokenRingInterfaceCounters:
 		return "Token Ring Interface Counters"
 	case SFlowType100BaseVGInterfaceCounters:
 		return "100BaseVG Interface Counters"
 	case SFlowTypeVLANCounters:
 		return "VLAN Counters"
 	case SFlowTypeLACPCounters:
 		return "LACP Counters"
 	case SFlowTypeProcessorCounters:
 		return "Processor Counters"
 	case SFlowTypeOpenflowPortCounters:
 		return "Openflow Port Counters"
 	case SFlowTypePORTNAMECounters:
 		return "PORT NAME Counters"
 	case SFLowTypeAPPRESOURCESCounters:
 		return "App Resources Counters"
 	case SFlowTypeOVSDPCounters:
 		return "OVSDP Counters"
 	default:
 		return ""

 	}
 }

 func decodeCounterSample(data *[]byte, expanded bool) (SFlowCounterSample, error) {
 	s := SFlowCounterSample{}
 	var sdc SFlowDataSource
 	var sdce SFlowDataSourceExpanded
 	var sdf SFlowDataFormat

 	*data, sdf = (*data)[4:], SFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	s.EnterpriseID, s.Format = sdf.decode()
 	*data, s.SampleLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, s.SequenceNumber = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if expanded {
 		*data, sdce = (*data)[8:], SFlowDataSourceExpanded{SFlowSourceFormat(binary.BigEndian.Uint32((*data)[:4])), SFlowSourceValue(binary.BigEndian.Uint32((*data)[4:8]))}
 		s.SourceIDClass, s.SourceIDIndex = sdce.decode()
 	} else {
 		*data, sdc = (*data)[4:], SFlowDataSource(binary.BigEndian.Uint32((*data)[:4]))
 		s.SourceIDClass, s.SourceIDIndex = sdc.decode()
 	}
 	*data, s.RecordCount = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	for i := uint32(0); i < s.RecordCount; i++ {
 		cdf := SFlowCounterDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 		_, counterRecordType := cdf.decode()
 		switch counterRecordType {
 		case SFlowTypeGenericInterfaceCounters:
 			if record, err := decodeGenericInterfaceCounters(data); err == nil {
 				s.Records = append(s.Records, record)
 			} else {
 				return s, err
 			}
 		case SFlowTypeEthernetInterfaceCounters:
 			if record, err := decodeEthernetCounters(data); err == nil {
 				s.Records = append(s.Records, record)
 			} else {
 				return s, err
 			}
 		case SFlowTypeTokenRingInterfaceCounters:
 			skipRecord(data)
 			return s, errors.New("skipping TypeTokenRingInterfaceCounters")
 		case SFlowType100BaseVGInterfaceCounters:
 			skipRecord(data)
 			return s, errors.New("skipping Type100BaseVGInterfaceCounters")
 		case SFlowTypeVLANCounters:
 			if record, err := decodeVLANCounters(data); err == nil {
 				s.Records = append(s.Records, record)
 			} else {
 				return s, err
 			}
 		case SFlowTypeLACPCounters:
 			if record, err := decodeLACPCounters(data); err == nil {
 				s.Records = append(s.Records, record)
 			} else {
 				return s, err
 			}
 		case SFlowTypeProcessorCounters:
 			if record, err := decodeProcessorCounters(data); err == nil {
 				s.Records = append(s.Records, record)
 			} else {
 				return s, err
 			}
 		case SFlowTypeOpenflowPortCounters:
 			if record, err := decodeOpenflowportCounters(data); err == nil {
 				s.Records = append(s.Records, record)
 			} else {
 				return s, err
 			}
 		case SFlowTypePORTNAMECounters:
 			if record, err := decodePortnameCounters(data); err == nil {
 				s.Records = append(s.Records, record)
 			} else {
 				return s, err
 			}
 		case SFLowTypeAPPRESOURCESCounters:
 			if record, err := decodeAppresourcesCounters(data); err == nil {
 				s.Records = append(s.Records, record)
 			} else {
 				return s, err
 			}
 		case SFlowTypeOVSDPCounters:
 			if record, err := decodeOVSDPCounters(data); err == nil {
 				s.Records = append(s.Records, record)
 			} else {
 				return s, err
 			}
 		default:
 			return s, fmt.Errorf("Invalid counter record type: %d", counterRecordType)
 		}
 	}
 	return s, nil
 }

 // SFlowBaseFlowRecord holds the fields common to all records
 // of type SFlowFlowRecordType
 type SFlowBaseFlowRecord struct {
 	EnterpriseID   SFlowEnterpriseID
 	Format         SFlowFlowRecordType
 	FlowDataLength uint32
 }

 func (bfr SFlowBaseFlowRecord) GetType() SFlowFlowRecordType {
 	return bfr.Format
 }

 // SFlowFlowRecordType denotes what kind of Flow Record is
 // represented. See RFC 3176
 type SFlowFlowRecordType uint32

 const (
 	SFlowTypeRawPacketFlow                  SFlowFlowRecordType = 1
 	SFlowTypeEthernetFrameFlow              SFlowFlowRecordType = 2
 	SFlowTypeIpv4Flow                       SFlowFlowRecordType = 3
 	SFlowTypeIpv6Flow                       SFlowFlowRecordType = 4
 	SFlowTypeExtendedSwitchFlow             SFlowFlowRecordType = 1001
 	SFlowTypeExtendedRouterFlow             SFlowFlowRecordType = 1002
 	SFlowTypeExtendedGatewayFlow            SFlowFlowRecordType = 1003
 	SFlowTypeExtendedUserFlow               SFlowFlowRecordType = 1004
 	SFlowTypeExtendedUrlFlow                SFlowFlowRecordType = 1005
 	SFlowTypeExtendedMlpsFlow               SFlowFlowRecordType = 1006
 	SFlowTypeExtendedNatFlow                SFlowFlowRecordType = 1007
 	SFlowTypeExtendedMlpsTunnelFlow         SFlowFlowRecordType = 1008
 	SFlowTypeExtendedMlpsVcFlow             SFlowFlowRecordType = 1009
 	SFlowTypeExtendedMlpsFecFlow            SFlowFlowRecordType = 1010
 	SFlowTypeExtendedMlpsLvpFecFlow         SFlowFlowRecordType = 1011
 	SFlowTypeExtendedVlanFlow               SFlowFlowRecordType = 1012
 	SFlowTypeExtendedIpv4TunnelEgressFlow   SFlowFlowRecordType = 1023
 	SFlowTypeExtendedIpv4TunnelIngressFlow  SFlowFlowRecordType = 1024
 	SFlowTypeExtendedIpv6TunnelEgressFlow   SFlowFlowRecordType = 1025
 	SFlowTypeExtendedIpv6TunnelIngressFlow  SFlowFlowRecordType = 1026
 	SFlowTypeExtendedDecapsulateEgressFlow  SFlowFlowRecordType = 1027
 	SFlowTypeExtendedDecapsulateIngressFlow SFlowFlowRecordType = 1028
 	SFlowTypeExtendedVniEgressFlow          SFlowFlowRecordType = 1029
 	SFlowTypeExtendedVniIngressFlow         SFlowFlowRecordType = 1030
 )

 func (rt SFlowFlowRecordType) String() string {
 	switch rt {
 	case SFlowTypeRawPacketFlow:
 		return "Raw Packet Flow Record"
 	case SFlowTypeEthernetFrameFlow:
 		return "Ethernet Frame Flow Record"
 	case SFlowTypeIpv4Flow:
 		return "IPv4 Flow Record"
 	case SFlowTypeIpv6Flow:
 		return "IPv6 Flow Record"
 	case SFlowTypeExtendedSwitchFlow:
 		return "Extended Switch Flow Record"
 	case SFlowTypeExtendedRouterFlow:
 		return "Extended Router Flow Record"
 	case SFlowTypeExtendedGatewayFlow:
 		return "Extended Gateway Flow Record"
 	case SFlowTypeExtendedUserFlow:
 		return "Extended User Flow Record"
 	case SFlowTypeExtendedUrlFlow:
 		return "Extended URL Flow Record"
 	case SFlowTypeExtendedMlpsFlow:
 		return "Extended MPLS Flow Record"
 	case SFlowTypeExtendedNatFlow:
 		return "Extended NAT Flow Record"
 	case SFlowTypeExtendedMlpsTunnelFlow:
 		return "Extended MPLS Tunnel Flow Record"
 	case SFlowTypeExtendedMlpsVcFlow:
 		return "Extended MPLS VC Flow Record"
 	case SFlowTypeExtendedMlpsFecFlow:
 		return "Extended MPLS FEC Flow Record"
 	case SFlowTypeExtendedMlpsLvpFecFlow:
 		return "Extended MPLS LVP FEC Flow Record"
 	case SFlowTypeExtendedVlanFlow:
 		return "Extended VLAN Flow Record"
 	case SFlowTypeExtendedIpv4TunnelEgressFlow:
 		return "Extended IPv4 Tunnel Egress Record"
 	case SFlowTypeExtendedIpv4TunnelIngressFlow:
 		return "Extended IPv4 Tunnel Ingress Record"
 	case SFlowTypeExtendedIpv6TunnelEgressFlow:
 		return "Extended IPv6 Tunnel Egress Record"
 	case SFlowTypeExtendedIpv6TunnelIngressFlow:
 		return "Extended IPv6 Tunnel Ingress Record"
 	case SFlowTypeExtendedDecapsulateEgressFlow:
 		return "Extended Decapsulate Egress Record"
 	case SFlowTypeExtendedDecapsulateIngressFlow:
 		return "Extended Decapsulate Ingress Record"
 	case SFlowTypeExtendedVniEgressFlow:
 		return "Extended VNI Ingress Record"
 	case SFlowTypeExtendedVniIngressFlow:
 		return "Extended VNI Ingress Record"
 	default:
 		return ""
 	}
 }

 // SFlowRawPacketFlowRecords hold information about a sampled
 // packet grabbed as it transited the agent. This is
 // perhaps the most useful and interesting record type,
 // as it holds the headers of the sampled packet and
 // can be used to build up a complete picture of the
 // traffic patterns on a network.
 //
 // The raw packet header is sent back into gopacket for
 // decoding, and the resulting gopackt.Packet is stored
 // in the Header member
 type SFlowRawPacketFlowRecord struct {
 	SFlowBaseFlowRecord
 	HeaderProtocol SFlowRawHeaderProtocol
 	FrameLength    uint32
 	PayloadRemoved uint32
 	HeaderLength   uint32
 	Header         gopacket.Packet
 }

 // Raw packet record types have the following structure:

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                 Header Protocol               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                 Frame Length                  |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                 Payload Removed               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                 Header Length                 |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  \                     Header                    \
 //  \                                               \
 //  \                                               \
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 type SFlowRawHeaderProtocol uint32

 const (
 	SFlowProtoEthernet   SFlowRawHeaderProtocol = 1
 	SFlowProtoISO88024   SFlowRawHeaderProtocol = 2
 	SFlowProtoISO88025   SFlowRawHeaderProtocol = 3
 	SFlowProtoFDDI       SFlowRawHeaderProtocol = 4
 	SFlowProtoFrameRelay SFlowRawHeaderProtocol = 5
 	SFlowProtoX25        SFlowRawHeaderProtocol = 6
 	SFlowProtoPPP        SFlowRawHeaderProtocol = 7
 	SFlowProtoSMDS       SFlowRawHeaderProtocol = 8
 	SFlowProtoAAL5       SFlowRawHeaderProtocol = 9
 	SFlowProtoAAL5_IP    SFlowRawHeaderProtocol = 10 /* e.g. Cisco AAL5 mux */
 	SFlowProtoIPv4       SFlowRawHeaderProtocol = 11
 	SFlowProtoIPv6       SFlowRawHeaderProtocol = 12
 	SFlowProtoMPLS       SFlowRawHeaderProtocol = 13
 	SFlowProtoPOS        SFlowRawHeaderProtocol = 14 /* RFC 1662, 2615 */
 )

 func (sfhp SFlowRawHeaderProtocol) String() string {
 	switch sfhp {
 	case SFlowProtoEthernet:
 		return "ETHERNET-ISO88023"
 	case SFlowProtoISO88024:
 		return "ISO88024-TOKENBUS"
 	case SFlowProtoISO88025:
 		return "ISO88025-TOKENRING"
 	case SFlowProtoFDDI:
 		return "FDDI"
 	case SFlowProtoFrameRelay:
 		return "FRAME-RELAY"
 	case SFlowProtoX25:
 		return "X25"
 	case SFlowProtoPPP:
 		return "PPP"
 	case SFlowProtoSMDS:
 		return "SMDS"
 	case SFlowProtoAAL5:
 		return "AAL5"
 	case SFlowProtoAAL5_IP:
 		return "AAL5-IP"
 	case SFlowProtoIPv4:
 		return "IPv4"
 	case SFlowProtoIPv6:
 		return "IPv6"
 	case SFlowProtoMPLS:
 		return "MPLS"
 	case SFlowProtoPOS:
 		return "POS"
 	}
 	return "UNKNOWN"
 }

 func decodeRawPacketFlowRecord(data *[]byte) (SFlowRawPacketFlowRecord, error) {
 	rec := SFlowRawPacketFlowRecord{}
 	header := []byte{}
 	var fdf SFlowFlowDataFormat

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	rec.EnterpriseID, rec.Format = fdf.decode()
 	*data, rec.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, rec.HeaderProtocol = (*data)[4:], SFlowRawHeaderProtocol(binary.BigEndian.Uint32((*data)[:4]))
 	*data, rec.FrameLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, rec.PayloadRemoved = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, rec.HeaderLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	headerLenWithPadding := int(rec.HeaderLength + ((4 - rec.HeaderLength) % 4))
 	*data, header = (*data)[headerLenWithPadding:], (*data)[:headerLenWithPadding]
 	rec.Header = gopacket.NewPacket(header, LayerTypeEthernet, gopacket.Default)
 	return rec, nil
 }

 // SFlowExtendedSwitchFlowRecord give additional information
 // about the sampled packet if it's available. It's mainly
 // useful for getting at the incoming and outgoing VLANs
 // An agent may or may not provide this information.
 type SFlowExtendedSwitchFlowRecord struct {
 	SFlowBaseFlowRecord
 	IncomingVLAN         uint32
 	IncomingVLANPriority uint32
 	OutgoingVLAN         uint32
 	OutgoingVLANPriority uint32
 }

 // Extended switch records have the following structure:

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   Incoming VLAN               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                Incoming VLAN Priority         |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   Outgoing VLAN               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                Outgoing VLAN Priority         |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 func decodeExtendedSwitchFlowRecord(data *[]byte) (SFlowExtendedSwitchFlowRecord, error) {
 	es := SFlowExtendedSwitchFlowRecord{}
 	var fdf SFlowFlowDataFormat

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	es.EnterpriseID, es.Format = fdf.decode()
 	*data, es.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, es.IncomingVLAN = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, es.IncomingVLANPriority = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, es.OutgoingVLAN = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, es.OutgoingVLANPriority = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	return es, nil
 }

 // SFlowExtendedRouterFlowRecord gives additional information
 // about the layer 3 routing information used to forward
 // the packet
 type SFlowExtendedRouterFlowRecord struct {
 	SFlowBaseFlowRecord
 	NextHop                net.IP
 	NextHopSourceMask      uint32
 	NextHopDestinationMask uint32
 }

 // Extended router records have the following structure:

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |   IP version of next hop router (1=v4|2=v6)   |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /     Next Hop address (v4=4byte|v6=16byte)     /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |              Next Hop Source Mask             |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |              Next Hop Destination Mask        |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 func decodeExtendedRouterFlowRecord(data *[]byte) (SFlowExtendedRouterFlowRecord, error) {
 	er := SFlowExtendedRouterFlowRecord{}
 	var fdf SFlowFlowDataFormat
 	var extendedRouterAddressType SFlowIPType

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	er.EnterpriseID, er.Format = fdf.decode()
 	*data, er.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, extendedRouterAddressType = (*data)[4:], SFlowIPType(binary.BigEndian.Uint32((*data)[:4]))
 	*data, er.NextHop = (*data)[extendedRouterAddressType.Length():], (*data)[:extendedRouterAddressType.Length()]
 	*data, er.NextHopSourceMask = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, er.NextHopDestinationMask = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	return er, nil
 }

 // SFlowExtendedGatewayFlowRecord describes information treasured by
 // nework engineers everywhere: AS path information listing which
 // BGP peer sent the packet, and various other BGP related info.
 // This information is vital because it gives a picture of how much
 // traffic is being sent from / received by various BGP peers.

 // Extended gateway records have the following structure:

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |   IP version of next hop router (1=v4|2=v6)   |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /     Next Hop address (v4=4byte|v6=16byte)     /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                       AS                      |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  Source AS                    |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    Peer AS                    |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  AS Path Count                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /                AS Path / Sequence             /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /                   Communities                 /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    Local Pref                 |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 // AS Path / Sequence:

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |     AS Source Type (Path=1 / Sequence=2)      |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |              Path / Sequence length           |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /              Path / Sequence Members          /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 // Communities:

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                communitiy length              |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /              communitiy Members               /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 type SFlowExtendedGatewayFlowRecord struct {
 	SFlowBaseFlowRecord
 	NextHop     net.IP
 	AS          uint32
 	SourceAS    uint32
 	PeerAS      uint32
 	ASPathCount uint32
 	ASPath      []SFlowASDestination
 	Communities []uint32
 	LocalPref   uint32
 }

 type SFlowASPathType uint32

 const (
 	SFlowASSet      SFlowASPathType = 1
 	SFlowASSequence SFlowASPathType = 2
 )

 func (apt SFlowASPathType) String() string {
 	switch apt {
 	case SFlowASSet:
 		return "AS Set"
 	case SFlowASSequence:
 		return "AS Sequence"
 	default:
 		return ""
 	}
 }

 type SFlowASDestination struct {
 	Type    SFlowASPathType
 	Count   uint32
 	Members []uint32
 }

 func (asd SFlowASDestination) String() string {
 	switch asd.Type {
 	case SFlowASSet:
 		return fmt.Sprint("AS Set:", asd.Members)
 	case SFlowASSequence:
 		return fmt.Sprint("AS Sequence:", asd.Members)
 	default:
 		return ""
 	}
 }

 func (ad *SFlowASDestination) decodePath(data *[]byte) {
 	*data, ad.Type = (*data)[4:], SFlowASPathType(binary.BigEndian.Uint32((*data)[:4]))
 	*data, ad.Count = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	ad.Members = make([]uint32, ad.Count)
 	for i := uint32(0); i < ad.Count; i++ {
 		var member uint32
 		*data, member = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 		ad.Members[i] = member
 	}
 }

 func decodeExtendedGatewayFlowRecord(data *[]byte) (SFlowExtendedGatewayFlowRecord, error) {
 	eg := SFlowExtendedGatewayFlowRecord{}
 	var fdf SFlowFlowDataFormat
 	var extendedGatewayAddressType SFlowIPType
 	var communitiesLength uint32
 	var community uint32

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	eg.EnterpriseID, eg.Format = fdf.decode()
 	*data, eg.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, extendedGatewayAddressType = (*data)[4:], SFlowIPType(binary.BigEndian.Uint32((*data)[:4]))
 	*data, eg.NextHop = (*data)[extendedGatewayAddressType.Length():], (*data)[:extendedGatewayAddressType.Length()]
 	*data, eg.AS = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, eg.SourceAS = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, eg.PeerAS = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, eg.ASPathCount = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	for i := uint32(0); i < eg.ASPathCount; i++ {
 		asPath := SFlowASDestination{}
 		asPath.decodePath(data)
 		eg.ASPath = append(eg.ASPath, asPath)
 	}
 	*data, communitiesLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	eg.Communities = make([]uint32, communitiesLength)
 	for j := uint32(0); j < communitiesLength; j++ {
 		*data, community = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 		eg.Communities[j] = community
 	}
 	*data, eg.LocalPref = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	return eg, nil
 }

 // **************************************************
 //  Extended URL Flow Record
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   direction                   |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                      URL                      |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                      Host                     |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 type SFlowURLDirection uint32

 const (
 	SFlowURLsrc SFlowURLDirection = 1
 	SFlowURLdst SFlowURLDirection = 2
 )

 func (urld SFlowURLDirection) String() string {
 	switch urld {
 	case SFlowURLsrc:
 		return "Source address is the server"
 	case SFlowURLdst:
 		return "Destination address is the server"
 	default:
 		return ""
 	}
 }

 type SFlowExtendedURLRecord struct {
 	SFlowBaseFlowRecord
 	Direction SFlowURLDirection
 	URL       string
 	Host      string
 }

 func decodeExtendedURLRecord(data *[]byte) (SFlowExtendedURLRecord, error) {
 	eur := SFlowExtendedURLRecord{}
 	var fdf SFlowFlowDataFormat
 	var urlLen uint32
 	var urlLenWithPad int
 	var hostLen uint32
 	var hostLenWithPad int
 	var urlBytes []byte
 	var hostBytes []byte

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	eur.EnterpriseID, eur.Format = fdf.decode()
 	*data, eur.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, eur.Direction = (*data)[4:], SFlowURLDirection(binary.BigEndian.Uint32((*data)[:4]))
 	*data, urlLen = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	urlLenWithPad = int(urlLen + ((4 - urlLen) % 4))
 	*data, urlBytes = (*data)[urlLenWithPad:], (*data)[:urlLenWithPad]
 	eur.URL = string(urlBytes[:urlLen])
 	*data, hostLen = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	hostLenWithPad = int(hostLen + ((4 - hostLen) % 4))
 	*data, hostBytes = (*data)[hostLenWithPad:], (*data)[:hostLenWithPad]
 	eur.Host = string(hostBytes[:hostLen])
 	return eur, nil
 }

 // **************************************************
 //  Extended User Flow Record
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                Source Character Set           |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                 Source User Id                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |              Destination Character Set        |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |               Destination User ID             |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 type SFlowExtendedUserFlow struct {
 	SFlowBaseFlowRecord
 	SourceCharSet      SFlowCharSet
 	SourceUserID       string
 	DestinationCharSet SFlowCharSet
 	DestinationUserID  string
 }

 type SFlowCharSet uint32

 const (
 	SFlowCSunknown                 SFlowCharSet = 2
 	SFlowCSASCII                   SFlowCharSet = 3
 	SFlowCSISOLatin1               SFlowCharSet = 4
 	SFlowCSISOLatin2               SFlowCharSet = 5
 	SFlowCSISOLatin3               SFlowCharSet = 6
 	SFlowCSISOLatin4               SFlowCharSet = 7
 	SFlowCSISOLatinCyrillic        SFlowCharSet = 8
 	SFlowCSISOLatinArabic          SFlowCharSet = 9
 	SFlowCSISOLatinGreek           SFlowCharSet = 10
 	SFlowCSISOLatinHebrew          SFlowCharSet = 11
 	SFlowCSISOLatin5               SFlowCharSet = 12
 	SFlowCSISOLatin6               SFlowCharSet = 13
 	SFlowCSISOTextComm             SFlowCharSet = 14
 	SFlowCSHalfWidthKatakana       SFlowCharSet = 15
 	SFlowCSJISEncoding             SFlowCharSet = 16
 	SFlowCSShiftJIS                SFlowCharSet = 17
 	SFlowCSEUCPkdFmtJapanese       SFlowCharSet = 18
 	SFlowCSEUCFixWidJapanese       SFlowCharSet = 19
 	SFlowCSISO4UnitedKingdom       SFlowCharSet = 20
 	SFlowCSISO11SwedishForNames    SFlowCharSet = 21
 	SFlowCSISO15Italian            SFlowCharSet = 22
 	SFlowCSISO17Spanish            SFlowCharSet = 23
 	SFlowCSISO21German             SFlowCharSet = 24
 	SFlowCSISO60DanishNorwegian    SFlowCharSet = 25
 	SFlowCSISO69French             SFlowCharSet = 26
 	SFlowCSISO10646UTF1            SFlowCharSet = 27
 	SFlowCSISO646basic1983         SFlowCharSet = 28
 	SFlowCSINVARIANT               SFlowCharSet = 29
 	SFlowCSISO2IntlRefVersion      SFlowCharSet = 30
 	SFlowCSNATSSEFI                SFlowCharSet = 31
 	SFlowCSNATSSEFIADD             SFlowCharSet = 32
 	SFlowCSNATSDANO                SFlowCharSet = 33
 	SFlowCSNATSDANOADD             SFlowCharSet = 34
 	SFlowCSISO10Swedish            SFlowCharSet = 35
 	SFlowCSKSC56011987             SFlowCharSet = 36
 	SFlowCSISO2022KR               SFlowCharSet = 37
 	SFlowCSEUCKR                   SFlowCharSet = 38
 	SFlowCSISO2022JP               SFlowCharSet = 39
 	SFlowCSISO2022JP2              SFlowCharSet = 40
 	SFlowCSISO13JISC6220jp         SFlowCharSet = 41
 	SFlowCSISO14JISC6220ro         SFlowCharSet = 42
 	SFlowCSISO16Portuguese         SFlowCharSet = 43
 	SFlowCSISO18Greek7Old          SFlowCharSet = 44
 	SFlowCSISO19LatinGreek         SFlowCharSet = 45
 	SFlowCSISO25French             SFlowCharSet = 46
 	SFlowCSISO27LatinGreek1        SFlowCharSet = 47
 	SFlowCSISO5427Cyrillic         SFlowCharSet = 48
 	SFlowCSISO42JISC62261978       SFlowCharSet = 49
 	SFlowCSISO47BSViewdata         SFlowCharSet = 50
 	SFlowCSISO49INIS               SFlowCharSet = 51
 	SFlowCSISO50INIS8              SFlowCharSet = 52
 	SFlowCSISO51INISCyrillic       SFlowCharSet = 53
 	SFlowCSISO54271981             SFlowCharSet = 54
 	SFlowCSISO5428Greek            SFlowCharSet = 55
 	SFlowCSISO57GB1988             SFlowCharSet = 56
 	SFlowCSISO58GB231280           SFlowCharSet = 57
 	SFlowCSISO61Norwegian2         SFlowCharSet = 58
 	SFlowCSISO70VideotexSupp1      SFlowCharSet = 59
 	SFlowCSISO84Portuguese2        SFlowCharSet = 60
 	SFlowCSISO85Spanish2           SFlowCharSet = 61
 	SFlowCSISO86Hungarian          SFlowCharSet = 62
 	SFlowCSISO87JISX0208           SFlowCharSet = 63
 	SFlowCSISO88Greek7             SFlowCharSet = 64
 	SFlowCSISO89ASMO449            SFlowCharSet = 65
 	SFlowCSISO90                   SFlowCharSet = 66
 	SFlowCSISO91JISC62291984a      SFlowCharSet = 67
 	SFlowCSISO92JISC62991984b      SFlowCharSet = 68
 	SFlowCSISO93JIS62291984badd    SFlowCharSet = 69
 	SFlowCSISO94JIS62291984hand    SFlowCharSet = 70
 	SFlowCSISO95JIS62291984handadd SFlowCharSet = 71
 	SFlowCSISO96JISC62291984kana   SFlowCharSet = 72
 	SFlowCSISO2033                 SFlowCharSet = 73
 	SFlowCSISO99NAPLPS             SFlowCharSet = 74
 	SFlowCSISO102T617bit           SFlowCharSet = 75
 	SFlowCSISO103T618bit           SFlowCharSet = 76
 	SFlowCSISO111ECMACyrillic      SFlowCharSet = 77
 	SFlowCSa71                     SFlowCharSet = 78
 	SFlowCSa72                     SFlowCharSet = 79
 	SFlowCSISO123CSAZ24341985gr    SFlowCharSet = 80
 	SFlowCSISO88596E               SFlowCharSet = 81
 	SFlowCSISO88596I               SFlowCharSet = 82
 	SFlowCSISO128T101G2            SFlowCharSet = 83
 	SFlowCSISO88598E               SFlowCharSet = 84
 	SFlowCSISO88598I               SFlowCharSet = 85
 	SFlowCSISO139CSN369103         SFlowCharSet = 86
 	SFlowCSISO141JUSIB1002         SFlowCharSet = 87
 	SFlowCSISO143IECP271           SFlowCharSet = 88
 	SFlowCSISO146Serbian           SFlowCharSet = 89
 	SFlowCSISO147Macedonian        SFlowCharSet = 90
 	SFlowCSISO150                  SFlowCharSet = 91
 	SFlowCSISO151Cuba              SFlowCharSet = 92
 	SFlowCSISO6937Add              SFlowCharSet = 93
 	SFlowCSISO153GOST1976874       SFlowCharSet = 94
 	SFlowCSISO8859Supp             SFlowCharSet = 95
 	SFlowCSISO10367Box             SFlowCharSet = 96
 	SFlowCSISO158Lap               SFlowCharSet = 97
 	SFlowCSISO159JISX02121990      SFlowCharSet = 98
 	SFlowCSISO646Danish            SFlowCharSet = 99
 	SFlowCSUSDK                    SFlowCharSet = 100
 	SFlowCSDKUS                    SFlowCharSet = 101
 	SFlowCSKSC5636                 SFlowCharSet = 102
 	SFlowCSUnicode11UTF7           SFlowCharSet = 103
 	SFlowCSISO2022CN               SFlowCharSet = 104
 	SFlowCSISO2022CNEXT            SFlowCharSet = 105
 	SFlowCSUTF8                    SFlowCharSet = 106
 	SFlowCSISO885913               SFlowCharSet = 109
 	SFlowCSISO885914               SFlowCharSet = 110
 	SFlowCSISO885915               SFlowCharSet = 111
 	SFlowCSISO885916               SFlowCharSet = 112
 	SFlowCSGBK                     SFlowCharSet = 113
 	SFlowCSGB18030                 SFlowCharSet = 114
 	SFlowCSOSDEBCDICDF0415         SFlowCharSet = 115
 	SFlowCSOSDEBCDICDF03IRV        SFlowCharSet = 116
 	SFlowCSOSDEBCDICDF041          SFlowCharSet = 117
 	SFlowCSISO115481               SFlowCharSet = 118
 	SFlowCSKZ1048                  SFlowCharSet = 119
 	SFlowCSUnicode                 SFlowCharSet = 1000
 	SFlowCSUCS4                    SFlowCharSet = 1001
 	SFlowCSUnicodeASCII            SFlowCharSet = 1002
 	SFlowCSUnicodeLatin1           SFlowCharSet = 1003
 	SFlowCSUnicodeJapanese         SFlowCharSet = 1004
 	SFlowCSUnicodeIBM1261          SFlowCharSet = 1005
 	SFlowCSUnicodeIBM1268          SFlowCharSet = 1006
 	SFlowCSUnicodeIBM1276          SFlowCharSet = 1007
 	SFlowCSUnicodeIBM1264          SFlowCharSet = 1008
 	SFlowCSUnicodeIBM1265          SFlowCharSet = 1009
 	SFlowCSUnicode11               SFlowCharSet = 1010
 	SFlowCSSCSU                    SFlowCharSet = 1011
 	SFlowCSUTF7                    SFlowCharSet = 1012
 	SFlowCSUTF16BE                 SFlowCharSet = 1013
 	SFlowCSUTF16LE                 SFlowCharSet = 1014
 	SFlowCSUTF16                   SFlowCharSet = 1015
 	SFlowCSCESU8                   SFlowCharSet = 1016
 	SFlowCSUTF32                   SFlowCharSet = 1017
 	SFlowCSUTF32BE                 SFlowCharSet = 1018
 	SFlowCSUTF32LE                 SFlowCharSet = 1019
 	SFlowCSBOCU1                   SFlowCharSet = 1020
 	SFlowCSWindows30Latin1         SFlowCharSet = 2000
 	SFlowCSWindows31Latin1         SFlowCharSet = 2001
 	SFlowCSWindows31Latin2         SFlowCharSet = 2002
 	SFlowCSWindows31Latin5         SFlowCharSet = 2003
 	SFlowCSHPRoman8                SFlowCharSet = 2004
 	SFlowCSAdobeStandardEncoding   SFlowCharSet = 2005
 	SFlowCSVenturaUS               SFlowCharSet = 2006
 	SFlowCSVenturaInternational    SFlowCharSet = 2007
 	SFlowCSDECMCS                  SFlowCharSet = 2008
 	SFlowCSPC850Multilingual       SFlowCharSet = 2009
 	SFlowCSPCp852                  SFlowCharSet = 2010
 	SFlowCSPC8CodePage437          SFlowCharSet = 2011
 	SFlowCSPC8DanishNorwegian      SFlowCharSet = 2012
 	SFlowCSPC862LatinHebrew        SFlowCharSet = 2013
 	SFlowCSPC8Turkish              SFlowCharSet = 2014
 	SFlowCSIBMSymbols              SFlowCharSet = 2015
 	SFlowCSIBMThai                 SFlowCharSet = 2016
 	SFlowCSHPLegal                 SFlowCharSet = 2017
 	SFlowCSHPPiFont                SFlowCharSet = 2018
 	SFlowCSHPMath8                 SFlowCharSet = 2019
 	SFlowCSHPPSMath                SFlowCharSet = 2020
 	SFlowCSHPDesktop               SFlowCharSet = 2021
 	SFlowCSVenturaMath             SFlowCharSet = 2022
 	SFlowCSMicrosoftPublishing     SFlowCharSet = 2023
 	SFlowCSWindows31J              SFlowCharSet = 2024
 	SFlowCSGB2312                  SFlowCharSet = 2025
 	SFlowCSBig5                    SFlowCharSet = 2026
 	SFlowCSMacintosh               SFlowCharSet = 2027
 	SFlowCSIBM037                  SFlowCharSet = 2028
 	SFlowCSIBM038                  SFlowCharSet = 2029
 	SFlowCSIBM273                  SFlowCharSet = 2030
 	SFlowCSIBM274                  SFlowCharSet = 2031
 	SFlowCSIBM275                  SFlowCharSet = 2032
 	SFlowCSIBM277                  SFlowCharSet = 2033
 	SFlowCSIBM278                  SFlowCharSet = 2034
 	SFlowCSIBM280                  SFlowCharSet = 2035
 	SFlowCSIBM281                  SFlowCharSet = 2036
 	SFlowCSIBM284                  SFlowCharSet = 2037
 	SFlowCSIBM285                  SFlowCharSet = 2038
 	SFlowCSIBM290                  SFlowCharSet = 2039
 	SFlowCSIBM297                  SFlowCharSet = 2040
 	SFlowCSIBM420                  SFlowCharSet = 2041
 	SFlowCSIBM423                  SFlowCharSet = 2042
 	SFlowCSIBM424                  SFlowCharSet = 2043
 	SFlowCSIBM500                  SFlowCharSet = 2044
 	SFlowCSIBM851                  SFlowCharSet = 2045
 	SFlowCSIBM855                  SFlowCharSet = 2046
 	SFlowCSIBM857                  SFlowCharSet = 2047
 	SFlowCSIBM860                  SFlowCharSet = 2048
 	SFlowCSIBM861                  SFlowCharSet = 2049
 	SFlowCSIBM863                  SFlowCharSet = 2050
 	SFlowCSIBM864                  SFlowCharSet = 2051
 	SFlowCSIBM865                  SFlowCharSet = 2052
 	SFlowCSIBM868                  SFlowCharSet = 2053
 	SFlowCSIBM869                  SFlowCharSet = 2054
 	SFlowCSIBM870                  SFlowCharSet = 2055
 	SFlowCSIBM871                  SFlowCharSet = 2056
 	SFlowCSIBM880                  SFlowCharSet = 2057
 	SFlowCSIBM891                  SFlowCharSet = 2058
 	SFlowCSIBM903                  SFlowCharSet = 2059
 	SFlowCSIBBM904                 SFlowCharSet = 2060
 	SFlowCSIBM905                  SFlowCharSet = 2061
 	SFlowCSIBM918                  SFlowCharSet = 2062
 	SFlowCSIBM1026                 SFlowCharSet = 2063
 	SFlowCSIBMEBCDICATDE           SFlowCharSet = 2064
 	SFlowCSEBCDICATDEA             SFlowCharSet = 2065
 	SFlowCSEBCDICCAFR              SFlowCharSet = 2066
 	SFlowCSEBCDICDKNO              SFlowCharSet = 2067
 	SFlowCSEBCDICDKNOA             SFlowCharSet = 2068
 	SFlowCSEBCDICFISE              SFlowCharSet = 2069
 	SFlowCSEBCDICFISEA             SFlowCharSet = 2070
 	SFlowCSEBCDICFR                SFlowCharSet = 2071
 	SFlowCSEBCDICIT                SFlowCharSet = 2072
 	SFlowCSEBCDICPT                SFlowCharSet = 2073
 	SFlowCSEBCDICES                SFlowCharSet = 2074
 	SFlowCSEBCDICESA               SFlowCharSet = 2075
 	SFlowCSEBCDICESS               SFlowCharSet = 2076
 	SFlowCSEBCDICUK                SFlowCharSet = 2077
 	SFlowCSEBCDICUS                SFlowCharSet = 2078
 	SFlowCSUnknown8BiT             SFlowCharSet = 2079
 	SFlowCSMnemonic                SFlowCharSet = 2080
 	SFlowCSMnem                    SFlowCharSet = 2081
 	SFlowCSVISCII                  SFlowCharSet = 2082
 	SFlowCSVIQR                    SFlowCharSet = 2083
 	SFlowCSKOI8R                   SFlowCharSet = 2084
 	SFlowCSHZGB2312                SFlowCharSet = 2085
 	SFlowCSIBM866                  SFlowCharSet = 2086
 	SFlowCSPC775Baltic             SFlowCharSet = 2087
 	SFlowCSKOI8U                   SFlowCharSet = 2088
 	SFlowCSIBM00858                SFlowCharSet = 2089
 	SFlowCSIBM00924                SFlowCharSet = 2090
 	SFlowCSIBM01140                SFlowCharSet = 2091
 	SFlowCSIBM01141                SFlowCharSet = 2092
 	SFlowCSIBM01142                SFlowCharSet = 2093
 	SFlowCSIBM01143                SFlowCharSet = 2094
 	SFlowCSIBM01144                SFlowCharSet = 2095
 	SFlowCSIBM01145                SFlowCharSet = 2096
 	SFlowCSIBM01146                SFlowCharSet = 2097
 	SFlowCSIBM01147                SFlowCharSet = 2098
 	SFlowCSIBM01148                SFlowCharSet = 2099
 	SFlowCSIBM01149                SFlowCharSet = 2100
 	SFlowCSBig5HKSCS               SFlowCharSet = 2101
 	SFlowCSIBM1047                 SFlowCharSet = 2102
 	SFlowCSPTCP154                 SFlowCharSet = 2103
 	SFlowCSAmiga1251               SFlowCharSet = 2104
 	SFlowCSKOI7switched            SFlowCharSet = 2105
 	SFlowCSBRF                     SFlowCharSet = 2106
 	SFlowCSTSCII                   SFlowCharSet = 2107
 	SFlowCSCP51932                 SFlowCharSet = 2108
 	SFlowCSWindows874              SFlowCharSet = 2109
 	SFlowCSWindows1250             SFlowCharSet = 2250
 	SFlowCSWindows1251             SFlowCharSet = 2251
 	SFlowCSWindows1252             SFlowCharSet = 2252
 	SFlowCSWindows1253             SFlowCharSet = 2253
 	SFlowCSWindows1254             SFlowCharSet = 2254
 	SFlowCSWindows1255             SFlowCharSet = 2255
 	SFlowCSWindows1256             SFlowCharSet = 2256
 	SFlowCSWindows1257             SFlowCharSet = 2257
 	SFlowCSWindows1258             SFlowCharSet = 2258
 	SFlowCSTIS620                  SFlowCharSet = 2259
 	SFlowCS50220                   SFlowCharSet = 2260
 	SFlowCSreserved                SFlowCharSet = 3000
 )

 func decodeExtendedUserFlow(data *[]byte) (SFlowExtendedUserFlow, error) {
 	eu := SFlowExtendedUserFlow{}
 	var fdf SFlowFlowDataFormat
 	var srcUserLen uint32
 	var srcUserLenWithPad int
 	var srcUserBytes []byte
 	var dstUserLen uint32
 	var dstUserLenWithPad int
 	var dstUserBytes []byte

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	eu.EnterpriseID, eu.Format = fdf.decode()
 	*data, eu.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, eu.SourceCharSet = (*data)[4:], SFlowCharSet(binary.BigEndian.Uint32((*data)[:4]))
 	*data, srcUserLen = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	srcUserLenWithPad = int(srcUserLen + ((4 - srcUserLen) % 4))
 	*data, srcUserBytes = (*data)[srcUserLenWithPad:], (*data)[:srcUserLenWithPad]
 	eu.SourceUserID = string(srcUserBytes[:srcUserLen])
 	*data, eu.DestinationCharSet = (*data)[4:], SFlowCharSet(binary.BigEndian.Uint32((*data)[:4]))
 	*data, dstUserLen = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	dstUserLenWithPad = int(dstUserLen + ((4 - dstUserLen) % 4))
 	*data, dstUserBytes = (*data)[dstUserLenWithPad:], (*data)[:dstUserLenWithPad]
 	eu.DestinationUserID = string(dstUserBytes[:dstUserLen])
 	return eu, nil
 }

 // **************************************************
 //  Packet IP version 4 Record
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                     Length                    |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    Protocol                   |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  Source IPv4                  |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                Destination IPv4               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   Source Port                 |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                Destionation Port              |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   TCP Flags                   |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                      TOS                      |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 type SFlowIpv4Record struct {
 	// The length of the IP packet excluding ower layer encapsulations
 	Length uint32
 	// IP Protocol type (for example, TCP = 6, UDP = 17)
 	Protocol uint32
 	// Source IP Address
 	IPSrc net.IP
 	// Destination IP Address
 	IPDst net.IP
 	// TCP/UDP source port number or equivalent
 	PortSrc uint32
 	// TCP/UDP destination port number or equivalent
 	PortDst uint32
 	// TCP flags
 	TCPFlags uint32
 	// IP type of service
 	TOS uint32
 }

 func decodeSFlowIpv4Record(data *[]byte) (SFlowIpv4Record, error) {
 	si := SFlowIpv4Record{}

 	*data, si.Length = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, si.Protocol = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, si.IPSrc = (*data)[4:], net.IP((*data)[:4])
 	*data, si.IPDst = (*data)[4:], net.IP((*data)[:4])
 	*data, si.PortSrc = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, si.PortDst = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, si.TCPFlags = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, si.TOS = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	return si, nil
 }

 // **************************************************
 //  Packet IP version 6 Record
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                     Length                    |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    Protocol                   |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  Source IPv4                  |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                Destination IPv4               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   Source Port                 |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                Destionation Port              |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   TCP Flags                   |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    Priority                   |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 type SFlowIpv6Record struct {
 	// The length of the IP packet excluding ower layer encapsulations
 	Length uint32
 	// IP Protocol type (for example, TCP = 6, UDP = 17)
 	Protocol uint32
 	// Source IP Address
 	IPSrc net.IP
 	// Destination IP Address
 	IPDst net.IP
 	// TCP/UDP source port number or equivalent
 	PortSrc uint32
 	// TCP/UDP destination port number or equivalent
 	PortDst uint32
 	// TCP flags
 	TCPFlags uint32
 	// IP priority
 	Priority uint32
 }

 func decodeSFlowIpv6Record(data *[]byte) (SFlowIpv6Record, error) {
 	si := SFlowIpv6Record{}

 	*data, si.Length = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, si.Protocol = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, si.IPSrc = (*data)[16:], net.IP((*data)[:16])
 	*data, si.IPDst = (*data)[16:], net.IP((*data)[:16])
 	*data, si.PortSrc = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, si.PortDst = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, si.TCPFlags = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, si.Priority = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	return si, nil
 }

 // **************************************************
 //  Extended IPv4 Tunnel Egress
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /           Packet IP version 4 Record          /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 type SFlowExtendedIpv4TunnelEgressRecord struct {
 	SFlowBaseFlowRecord
 	SFlowIpv4Record SFlowIpv4Record
 }

 func decodeExtendedIpv4TunnelEgress(data *[]byte) (SFlowExtendedIpv4TunnelEgressRecord, error) {
 	rec := SFlowExtendedIpv4TunnelEgressRecord{}
 	var fdf SFlowFlowDataFormat

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	rec.EnterpriseID, rec.Format = fdf.decode()
 	*data, rec.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	rec.SFlowIpv4Record, _ = decodeSFlowIpv4Record(data)

 	return rec, nil
 }

 // **************************************************
 //  Extended IPv4 Tunnel Ingress
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /           Packet IP version 4 Record          /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 type SFlowExtendedIpv4TunnelIngressRecord struct {
 	SFlowBaseFlowRecord
 	SFlowIpv4Record SFlowIpv4Record
 }

 func decodeExtendedIpv4TunnelIngress(data *[]byte) (SFlowExtendedIpv4TunnelIngressRecord, error) {
 	rec := SFlowExtendedIpv4TunnelIngressRecord{}
 	var fdf SFlowFlowDataFormat

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	rec.EnterpriseID, rec.Format = fdf.decode()
 	*data, rec.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	rec.SFlowIpv4Record, _ = decodeSFlowIpv4Record(data)

 	return rec, nil
 }

 // **************************************************
 //  Extended IPv6 Tunnel Egress
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /           Packet IP version 6 Record          /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 type SFlowExtendedIpv6TunnelEgressRecord struct {
 	SFlowBaseFlowRecord
 	SFlowIpv6Record
 }

 func decodeExtendedIpv6TunnelEgress(data *[]byte) (SFlowExtendedIpv6TunnelEgressRecord, error) {
 	rec := SFlowExtendedIpv6TunnelEgressRecord{}
 	var fdf SFlowFlowDataFormat

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	rec.EnterpriseID, rec.Format = fdf.decode()
 	*data, rec.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	rec.SFlowIpv6Record, _ = decodeSFlowIpv6Record(data)

 	return rec, nil
 }

 // **************************************************
 //  Extended IPv6 Tunnel Ingress
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /           Packet IP version 6 Record          /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 type SFlowExtendedIpv6TunnelIngressRecord struct {
 	SFlowBaseFlowRecord
 	SFlowIpv6Record
 }

 func decodeExtendedIpv6TunnelIngress(data *[]byte) (SFlowExtendedIpv6TunnelIngressRecord, error) {
 	rec := SFlowExtendedIpv6TunnelIngressRecord{}
 	var fdf SFlowFlowDataFormat

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	rec.EnterpriseID, rec.Format = fdf.decode()
 	*data, rec.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	rec.SFlowIpv6Record, _ = decodeSFlowIpv6Record(data)

 	return rec, nil
 }

 // **************************************************
 //  Extended Decapsulate Egress
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |               Inner Header Offset             |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 type SFlowExtendedDecapsulateEgressRecord struct {
 	SFlowBaseFlowRecord
 	InnerHeaderOffset uint32
 }

 func decodeExtendedDecapsulateEgress(data *[]byte) (SFlowExtendedDecapsulateEgressRecord, error) {
 	rec := SFlowExtendedDecapsulateEgressRecord{}
 	var fdf SFlowFlowDataFormat

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	rec.EnterpriseID, rec.Format = fdf.decode()
 	*data, rec.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, rec.InnerHeaderOffset = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	return rec, nil
 }

 // **************************************************
 //  Extended Decapsulate Ingress
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |               Inner Header Offset             |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 type SFlowExtendedDecapsulateIngressRecord struct {
 	SFlowBaseFlowRecord
 	InnerHeaderOffset uint32
 }

 func decodeExtendedDecapsulateIngress(data *[]byte) (SFlowExtendedDecapsulateIngressRecord, error) {
 	rec := SFlowExtendedDecapsulateIngressRecord{}
 	var fdf SFlowFlowDataFormat

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	rec.EnterpriseID, rec.Format = fdf.decode()
 	*data, rec.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, rec.InnerHeaderOffset = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	return rec, nil
 }

 // **************************************************
 //  Extended VNI Egress
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                       VNI                     |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 type SFlowExtendedVniEgressRecord struct {
 	SFlowBaseFlowRecord
 	VNI uint32
 }

 func decodeExtendedVniEgress(data *[]byte) (SFlowExtendedVniEgressRecord, error) {
 	rec := SFlowExtendedVniEgressRecord{}
 	var fdf SFlowFlowDataFormat

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	rec.EnterpriseID, rec.Format = fdf.decode()
 	*data, rec.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, rec.VNI = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	return rec, nil
 }

 // **************************************************
 //  Extended VNI Ingress
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                       VNI                     |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 type SFlowExtendedVniIngressRecord struct {
 	SFlowBaseFlowRecord
 	VNI uint32
 }

 func decodeExtendedVniIngress(data *[]byte) (SFlowExtendedVniIngressRecord, error) {
 	rec := SFlowExtendedVniIngressRecord{}
 	var fdf SFlowFlowDataFormat

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	rec.EnterpriseID, rec.Format = fdf.decode()
 	*data, rec.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, rec.VNI = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	return rec, nil
 }

 // **************************************************
 //  Counter Record
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  counter length               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /                   counter data                /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 type SFlowBaseCounterRecord struct {
 	EnterpriseID   SFlowEnterpriseID
 	Format         SFlowCounterRecordType
 	FlowDataLength uint32
 }

 func (bcr SFlowBaseCounterRecord) GetType() SFlowCounterRecordType {
 	switch bcr.Format {
 	case SFlowTypeGenericInterfaceCounters:
 		return SFlowTypeGenericInterfaceCounters
 	case SFlowTypeEthernetInterfaceCounters:
 		return SFlowTypeEthernetInterfaceCounters
 	case SFlowTypeTokenRingInterfaceCounters:
 		return SFlowTypeTokenRingInterfaceCounters
 	case SFlowType100BaseVGInterfaceCounters:
 		return SFlowType100BaseVGInterfaceCounters
 	case SFlowTypeVLANCounters:
 		return SFlowTypeVLANCounters
 	case SFlowTypeLACPCounters:
 		return SFlowTypeLACPCounters
 	case SFlowTypeProcessorCounters:
 		return SFlowTypeProcessorCounters
 	case SFlowTypeOpenflowPortCounters:
 		return SFlowTypeOpenflowPortCounters
 	case SFlowTypePORTNAMECounters:
 		return SFlowTypePORTNAMECounters
 	case SFLowTypeAPPRESOURCESCounters:
 		return SFLowTypeAPPRESOURCESCounters
 	case SFlowTypeOVSDPCounters:
 		return SFlowTypeOVSDPCounters
 	}
 	unrecognized := fmt.Sprint("Unrecognized counter record type:", bcr.Format)
 	panic(unrecognized)
 }

 // **************************************************
 //  Counter Record
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  counter length               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    IfIndex                    |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    IfType                     |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   IfSpeed                     |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   IfDirection                 |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    IfStatus                   |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   IFInOctets                  |
 //  |                                               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   IfInUcastPkts               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  IfInMulticastPkts            |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  IfInBroadcastPkts            |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    IfInDiscards               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    InInErrors                 |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  IfInUnknownProtos            |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   IfOutOctets                 |
 //  |                                               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   IfOutUcastPkts              |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  IfOutMulticastPkts           |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  IfOutBroadcastPkts           |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   IfOutDiscards               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    IfOUtErrors                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                 IfPromiscouousMode            |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 type SFlowGenericInterfaceCounters struct {
 	SFlowBaseCounterRecord
 	IfIndex            uint32
 	IfType             uint32
 	IfSpeed            uint64
 	IfDirection        uint32
 	IfStatus           uint32
 	IfInOctets         uint64
 	IfInUcastPkts      uint32
 	IfInMulticastPkts  uint32
 	IfInBroadcastPkts  uint32
 	IfInDiscards       uint32
 	IfInErrors         uint32
 	IfInUnknownProtos  uint32
 	IfOutOctets        uint64
 	IfOutUcastPkts     uint32
 	IfOutMulticastPkts uint32
 	IfOutBroadcastPkts uint32
 	IfOutDiscards      uint32
 	IfOutErrors        uint32
 	IfPromiscuousMode  uint32
 }

 func decodeGenericInterfaceCounters(data *[]byte) (SFlowGenericInterfaceCounters, error) {
 	gic := SFlowGenericInterfaceCounters{}
 	var cdf SFlowCounterDataFormat

 	*data, cdf = (*data)[4:], SFlowCounterDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	gic.EnterpriseID, gic.Format = cdf.decode()
 	*data, gic.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfIndex = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfType = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfSpeed = (*data)[8:], binary.BigEndian.Uint64((*data)[:8])
 	*data, gic.IfDirection = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfStatus = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfInOctets = (*data)[8:], binary.BigEndian.Uint64((*data)[:8])
 	*data, gic.IfInUcastPkts = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfInMulticastPkts = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfInBroadcastPkts = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfInDiscards = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfInErrors = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfInUnknownProtos = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfOutOctets = (*data)[8:], binary.BigEndian.Uint64((*data)[:8])
 	*data, gic.IfOutUcastPkts = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfOutMulticastPkts = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfOutBroadcastPkts = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfOutDiscards = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfOutErrors = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, gic.IfPromiscuousMode = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	return gic, nil
 }

 // **************************************************
 //  Counter Record
 // **************************************************

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  counter length               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  /                   counter data                /
 //  /                                               /
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 type SFlowEthernetCounters struct {
 	SFlowBaseCounterRecord
 	AlignmentErrors           uint32
 	FCSErrors                 uint32
 	SingleCollisionFrames     uint32
 	MultipleCollisionFrames   uint32
 	SQETestErrors             uint32
 	DeferredTransmissions     uint32
 	LateCollisions            uint32
 	ExcessiveCollisions       uint32
 	InternalMacTransmitErrors uint32
 	CarrierSenseErrors        uint32
 	FrameTooLongs             uint32
 	InternalMacReceiveErrors  uint32
 	SymbolErrors              uint32
 }

 func decodeEthernetCounters(data *[]byte) (SFlowEthernetCounters, error) {
 	ec := SFlowEthernetCounters{}
 	var cdf SFlowCounterDataFormat

 	*data, cdf = (*data)[4:], SFlowCounterDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	ec.EnterpriseID, ec.Format = cdf.decode()
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.AlignmentErrors = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.FCSErrors = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.SingleCollisionFrames = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.MultipleCollisionFrames = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.SQETestErrors = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.DeferredTransmissions = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.LateCollisions = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.ExcessiveCollisions = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.InternalMacTransmitErrors = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.CarrierSenseErrors = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.FrameTooLongs = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.InternalMacReceiveErrors = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	if len(*data) < 4 {
 		return SFlowEthernetCounters{}, errors.New("ethernet counters too small")
 	}
 	*data, ec.SymbolErrors = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	return ec, nil
 }

 // VLAN Counter

 type SFlowVLANCounters struct {
 	SFlowBaseCounterRecord
 	VlanID        uint32
 	Octets        uint64
 	UcastPkts     uint32
 	MulticastPkts uint32
 	BroadcastPkts uint32
 	Discards      uint32
 }

 func decodeVLANCounters(data *[]byte) (SFlowVLANCounters, error) {
 	vc := SFlowVLANCounters{}
 	var cdf SFlowCounterDataFormat

 	*data, cdf = (*data)[4:], SFlowCounterDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	vc.EnterpriseID, vc.Format = cdf.decode()
 	vc.EnterpriseID, vc.Format = cdf.decode()
 	*data, vc.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, vc.VlanID = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, vc.Octets = (*data)[8:], binary.BigEndian.Uint64((*data)[:8])
 	*data, vc.UcastPkts = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, vc.MulticastPkts = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, vc.BroadcastPkts = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, vc.Discards = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	return vc, nil
 }

 //SFLLACPportState  :  SFlow LACP Port State (All(4) - 32 bit)
 type SFLLACPPortState struct {
 	PortStateAll uint32
 }

 //LACPcounters  :  LACP SFlow Counters  ( 64 Bytes )
 type SFlowLACPCounters struct {
 	SFlowBaseCounterRecord
 	ActorSystemID        net.HardwareAddr
 	PartnerSystemID      net.HardwareAddr
 	AttachedAggID        uint32
 	LacpPortState        SFLLACPPortState
 	LACPDUsRx            uint32
 	MarkerPDUsRx         uint32
 	MarkerResponsePDUsRx uint32
 	UnknownRx            uint32
 	IllegalRx            uint32
 	LACPDUsTx            uint32
 	MarkerPDUsTx         uint32
 	MarkerResponsePDUsTx uint32
 }

 func decodeLACPCounters(data *[]byte) (SFlowLACPCounters, error) {
 	la := SFlowLACPCounters{}
 	var cdf SFlowCounterDataFormat

 	*data, cdf = (*data)[4:], SFlowCounterDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	la.EnterpriseID, la.Format = cdf.decode()
 	*data, la.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, la.ActorSystemID = (*data)[6:], (*data)[:6]
 	*data = (*data)[2:] // remove padding
 	*data, la.PartnerSystemID = (*data)[6:], (*data)[:6]
 	*data = (*data)[2:] //remove padding
 	*data, la.AttachedAggID = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, la.LacpPortState.PortStateAll = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, la.LACPDUsRx = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, la.MarkerPDUsRx = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, la.MarkerResponsePDUsRx = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, la.UnknownRx = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, la.IllegalRx = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, la.LACPDUsTx = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, la.MarkerPDUsTx = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, la.MarkerResponsePDUsTx = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	return la, nil

 }

 // **************************************************
 //  Processor Counter Record
 // **************************************************
 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  counter length               |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    FiveSecCpu                 |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    OneMinCpu                  |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    GiveMinCpu                 |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                   TotalMemory                 |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                    FreeMemory                 |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 type SFlowProcessorCounters struct {
 	SFlowBaseCounterRecord
 	FiveSecCpu  uint32 // 5 second average CPU utilization
 	OneMinCpu   uint32 // 1 minute average CPU utilization
 	FiveMinCpu  uint32 // 5 minute average CPU utilization
 	TotalMemory uint64 // total memory (in bytes)
 	FreeMemory  uint64 // free memory (in bytes)
 }

 func decodeProcessorCounters(data *[]byte) (SFlowProcessorCounters, error) {
 	pc := SFlowProcessorCounters{}
 	var cdf SFlowCounterDataFormat
 	var high32, low32 uint32

 	*data, cdf = (*data)[4:], SFlowCounterDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	pc.EnterpriseID, pc.Format = cdf.decode()
 	*data, pc.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	*data, pc.FiveSecCpu = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, pc.OneMinCpu = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, pc.FiveMinCpu = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, high32 = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, low32 = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	pc.TotalMemory = (uint64(high32) << 32) + uint64(low32)
 	*data, high32 = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, low32 = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	pc.FreeMemory = (uint64(high32)) + uint64(low32)

 	return pc, nil
 }

 // SFlowEthernetFrameFlowRecord give additional information
 // about the sampled packet if it's available.
 // An agent may or may not provide this information.
 type SFlowEthernetFrameFlowRecord struct {
 	SFlowBaseFlowRecord
 	FrameLength uint32
 	SrcMac      net.HardwareAddr
 	DstMac      net.HardwareAddr
 	Type        uint32
 }

 // Ethernet frame flow records have the following structure:

 //  0                      15                      31
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |      20 bit Interprise (0)     |12 bit format |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                  record length                |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |                Source Mac Address             |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |             Destination Mac Address           |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //  |               Ethernet Packet Type            |
 //  +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

 func decodeEthernetFrameFlowRecord(data *[]byte) (SFlowEthernetFrameFlowRecord, error) {
 	es := SFlowEthernetFrameFlowRecord{}
 	var fdf SFlowFlowDataFormat

 	*data, fdf = (*data)[4:], SFlowFlowDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	es.EnterpriseID, es.Format = fdf.decode()
 	*data, es.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	*data, es.FrameLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, es.SrcMac = (*data)[8:], net.HardwareAddr((*data)[:6])
 	*data, es.DstMac = (*data)[8:], net.HardwareAddr((*data)[:6])
 	*data, es.Type = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	return es, nil
 }

 //SFlowOpenflowPortCounters  :  OVS-Sflow OpenFlow Port Counter  ( 20 Bytes )
 type SFlowOpenflowPortCounters struct {
 	SFlowBaseCounterRecord
 	DatapathID uint64
 	PortNo     uint32
 }

 func decodeOpenflowportCounters(data *[]byte) (SFlowOpenflowPortCounters, error) {
 	ofp := SFlowOpenflowPortCounters{}
 	var cdf SFlowCounterDataFormat

 	*data, cdf = (*data)[4:], SFlowCounterDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	ofp.EnterpriseID, ofp.Format = cdf.decode()
 	*data, ofp.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, ofp.DatapathID = (*data)[8:], binary.BigEndian.Uint64((*data)[:8])
 	*data, ofp.PortNo = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	return ofp, nil
 }

 //SFlowAppresourcesCounters  :  OVS_Sflow App Resources Counter ( 48 Bytes )
 type SFlowAppresourcesCounters struct {
 	SFlowBaseCounterRecord
 	UserTime   uint32
 	SystemTime uint32
 	MemUsed    uint64
 	MemMax     uint64
 	FdOpen     uint32
 	FdMax      uint32
 	ConnOpen   uint32
 	ConnMax    uint32
 }

 func decodeAppresourcesCounters(data *[]byte) (SFlowAppresourcesCounters, error) {
 	app := SFlowAppresourcesCounters{}
 	var cdf SFlowCounterDataFormat

 	*data, cdf = (*data)[4:], SFlowCounterDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	app.EnterpriseID, app.Format = cdf.decode()
 	*data, app.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, app.UserTime = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, app.SystemTime = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, app.MemUsed = (*data)[8:], binary.BigEndian.Uint64((*data)[:8])
 	*data, app.MemMax = (*data)[8:], binary.BigEndian.Uint64((*data)[:8])
 	*data, app.FdOpen = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, app.FdMax = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, app.ConnOpen = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, app.ConnMax = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	return app, nil
 }

 //SFlowOVSDPCounters  :  OVS-Sflow DataPath Counter  ( 32 Bytes )
 type SFlowOVSDPCounters struct {
 	SFlowBaseCounterRecord
 	NHit     uint32
 	NMissed  uint32
 	NLost    uint32
 	NMaskHit uint32
 	NFlows   uint32
 	NMasks   uint32
 }

 func decodeOVSDPCounters(data *[]byte) (SFlowOVSDPCounters, error) {
 	dp := SFlowOVSDPCounters{}
 	var cdf SFlowCounterDataFormat

 	*data, cdf = (*data)[4:], SFlowCounterDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	dp.EnterpriseID, dp.Format = cdf.decode()
 	*data, dp.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, dp.NHit = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, dp.NMissed = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, dp.NLost = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, dp.NMaskHit = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, dp.NFlows = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	*data, dp.NMasks = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])

 	return dp, nil
 }

 //SFlowPORTNAME  :  OVS-Sflow PORTNAME Counter Sampletype ( 20 Bytes )
 type SFlowPORTNAME struct {
 	SFlowBaseCounterRecord
 	Len uint32
 	Str string
 }

 func decodeString(data *[]byte) (len uint32, str string) {
 	*data, len = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	str = string((*data)[:len])
 	if (len % 4) != 0 {
 		len += 4 - len%4
 	}
 	*data = (*data)[len:]
 	return
 }

 func decodePortnameCounters(data *[]byte) (SFlowPORTNAME, error) {
 	pn := SFlowPORTNAME{}
 	var cdf SFlowCounterDataFormat

 	*data, cdf = (*data)[4:], SFlowCounterDataFormat(binary.BigEndian.Uint32((*data)[:4]))
 	pn.EnterpriseID, pn.Format = cdf.decode()
 	*data, pn.FlowDataLength = (*data)[4:], binary.BigEndian.Uint32((*data)[:4])
 	pn.Len, pn.Str = decodeString(data)

 	return pn, nil
 }