/
sflow_v5.go
472 lines (448 loc) · 14.6 KB
/
sflow_v5.go
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package netflow
import (
"bytes"
"encoding/hex"
"fmt"
"net"
"time"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/netsampler/goflow2/v2/decoders/sflow"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/metric"
)
// Decoder structure
type sflowv5Decoder struct {
Log telegraf.Logger
warnedCounterRaw map[uint32]bool
warnedFlowRaw map[int64]bool
}
func (d *sflowv5Decoder) Init() error {
if err := initL4ProtoMapping(); err != nil {
return fmt.Errorf("initializing layer 4 protocol mapping failed: %w", err)
}
d.warnedCounterRaw = make(map[uint32]bool)
d.warnedFlowRaw = make(map[int64]bool)
return nil
}
func (d *sflowv5Decoder) Decode(srcIP net.IP, payload []byte) ([]telegraf.Metric, error) {
t := time.Now()
src := srcIP.String()
// Decode the message
var msg sflow.Packet
buf := bytes.NewBuffer(payload)
if err := sflow.DecodeMessageVersion(buf, &msg); err != nil {
return nil, err
}
// Extract metrics
metrics := make([]telegraf.Metric, 0, len(msg.Samples))
for _, s := range msg.Samples {
tags := map[string]string{
"source": src,
"version": "sFlowV5",
}
switch sample := s.(type) {
case sflow.FlowSample:
fields := map[string]interface{}{
"ip_version": decodeSflowIPVersion(msg.IPVersion),
"sys_uptime": msg.Uptime,
"agent_subid": msg.SubAgentId,
"seq_number": sample.Header.SampleSequenceNumber,
"sampling_interval": sample.SamplingRate,
"in_total_packets": sample.SamplePool,
"sampling_drops": sample.Drops,
"in_snmp": sample.Input,
}
var err error
fields["agent_ip"], err = decodeIP(msg.AgentIP)
if err != nil {
return nil, fmt.Errorf("decoding 'agent_ip' failed: %w", err)
}
if sample.Output>>31 == 0 {
fields["out_snmp"] = sample.Output & 0x7fffffff
}
// Decode the source information
if name := decodeSflowSourceInterface(sample.Header.SourceIdType); name != "" {
fields[name] = sample.Header.SourceIdValue
}
// Decode the sampling direction
if sample.Header.SourceIdValue == sample.Input {
fields["direction"] = "ingress"
} else {
fields["direction"] = "egress"
}
recordFields, err := d.decodeFlowRecords(sample.Records)
if err != nil {
return nil, err
}
for k, v := range recordFields {
fields[k] = v
}
metrics = append(metrics, metric.New("netflow", tags, fields, t))
case sflow.ExpandedFlowSample:
fields := map[string]interface{}{
"ip_version": decodeSflowIPVersion(msg.IPVersion),
"sys_uptime": msg.Uptime,
"agent_subid": msg.SubAgentId,
"seq_number": sample.Header.SampleSequenceNumber,
"sampling_interval": sample.SamplingRate,
"in_total_packets": sample.SamplePool,
"sampling_drops": sample.Drops,
"in_snmp": sample.InputIfValue,
}
var err error
fields["agent_ip"], err = decodeIP(msg.AgentIP)
if err != nil {
return nil, fmt.Errorf("decoding 'agent_ip' failed: %w", err)
}
if sample.OutputIfFormat == 0 {
fields["out_snmp"] = sample.OutputIfValue
}
// Decode the source information
if name := decodeSflowSourceInterface(sample.Header.SourceIdType); name != "" {
fields[name] = sample.Header.SourceIdValue
}
// Decode the sampling direction
if sample.Header.SourceIdValue == sample.InputIfValue {
fields["direction"] = "ingress"
} else {
fields["direction"] = "egress"
}
recordFields, err := d.decodeFlowRecords(sample.Records)
if err != nil {
return nil, err
}
for k, v := range recordFields {
fields[k] = v
}
metrics = append(metrics, metric.New("netflow", tags, fields, t))
case sflow.CounterSample:
fields := map[string]interface{}{
"ip_version": decodeSflowIPVersion(msg.IPVersion),
"sys_uptime": msg.Uptime,
"agent_subid": msg.SubAgentId,
"seq_number": sample.Header.SampleSequenceNumber,
}
var err error
fields["agent_ip"], err = decodeIP(msg.AgentIP)
if err != nil {
return nil, fmt.Errorf("decoding 'agent_ip' failed: %w", err)
}
// Decode the source information
if name := decodeSflowSourceInterface(sample.Header.SourceIdType); name != "" {
fields[name] = sample.Header.SourceIdValue
}
recordFields, err := d.decodeCounterRecords(sample.Records)
if err != nil {
return nil, err
}
for k, v := range recordFields {
fields[k] = v
}
metrics = append(metrics, metric.New("netflow", tags, fields, t))
default:
return nil, fmt.Errorf("unknown record type %T", s)
}
}
return metrics, nil
}
func (d *sflowv5Decoder) decodeFlowRecords(records []sflow.FlowRecord) (map[string]interface{}, error) {
fields := make(map[string]interface{})
for _, r := range records {
if r.Data == nil {
continue
}
switch record := r.Data.(type) {
case sflow.SampledHeader:
fields["l2_protocol"] = decodeSflowHeaderProtocol(record.Protocol)
fields["l2_bytes"] = record.FrameLength
pktfields, err := d.decodeRawHeaderSample(&record)
if err != nil {
return nil, err
}
for k, v := range pktfields {
fields[k] = v
}
case sflow.SampledEthernet:
var err error
fields["eth_total_len"] = record.Length
fields["in_src_mac"], err = decodeMAC(record.SrcMac)
if err != nil {
return nil, fmt.Errorf("decoding 'in_src_mac' failed: %w", err)
}
fields["out_dst_mac"], err = decodeMAC(record.DstMac)
if err != nil {
return nil, fmt.Errorf("decoding 'out_dst_mac' failed: %w", err)
}
fields["datalink_frame_type"] = layers.EthernetType(record.EthType & 0x0000ffff).String()
case sflow.SampledIPv4:
var err error
fields["ipv4_total_len"] = record.Length
fields["protocol"] = mapL4Proto(uint8(record.Protocol & 0x000000ff))
fields["src"], err = decodeIP(record.SrcIP)
if err != nil {
return nil, fmt.Errorf("decoding 'src' failed: %w", err)
}
fields["dst"], err = decodeIP(record.DstIP)
if err != nil {
return nil, fmt.Errorf("decoding 'dst' failed: %w", err)
}
fields["src_port"] = record.SrcPort
fields["dst_port"] = record.DstPort
fields["src_tos"] = record.Tos
fields["tcp_flags"], err = decodeTCPFlags([]byte{byte(record.TcpFlags & 0x000000ff)})
if err != nil {
return nil, fmt.Errorf("decoding 'tcp_flags' failed: %w", err)
}
case sflow.SampledIPv6:
var err error
fields["ipv6_total_len"] = record.Length
fields["protocol"] = mapL4Proto(uint8(record.Protocol & 0x000000ff))
fields["src"], err = decodeIP(record.SrcIP)
if err != nil {
return nil, fmt.Errorf("decoding 'src' failed: %w", err)
}
fields["dst"], err = decodeIP(record.DstIP)
if err != nil {
return nil, fmt.Errorf("decoding 'dst' failed: %w", err)
}
fields["src_port"] = record.SrcPort
fields["dst_port"] = record.DstPort
fields["tcp_flags"], err = decodeTCPFlags([]byte{byte(record.TcpFlags & 0x000000ff)})
if err != nil {
return nil, fmt.Errorf("decoding 'tcp_flags' failed: %w", err)
}
case sflow.ExtendedSwitch:
fields["vlan_src"] = record.SrcVlan
fields["vlan_src_priority"] = record.SrcPriority
fields["vlan_dst"] = record.DstVlan
fields["vlan_dst_priority"] = record.DstPriority
case sflow.ExtendedRouter:
var err error
fields["next_hop"], err = decodeIP(record.NextHop)
if err != nil {
return nil, fmt.Errorf("decoding 'next_hop' failed: %w", err)
}
fields["src_mask"] = record.SrcMaskLen
fields["dst_mask"] = record.DstMaskLen
case sflow.ExtendedGateway:
var err error
fields["next_hop"], err = decodeIP(record.NextHop)
if err != nil {
return nil, fmt.Errorf("decoding 'next_hop' failed: %w", err)
}
fields["bgp_src_as"] = record.SrcAS
fields["bgp_dst_as"] = record.ASDestinations
fields["bgp_next_hop"], err = decodeIP(record.NextHop)
if err != nil {
return nil, fmt.Errorf("decoding 'bgp_next_hop' failed: %w", err)
}
fields["bgp_prev_as"] = record.SrcPeerAS
if len(record.ASPath) > 0 {
fields["bgp_next_as"] = record.ASPath[0]
}
default:
return nil, fmt.Errorf("unhandled flow record type %T", r.Data)
}
}
return fields, nil
}
func (d *sflowv5Decoder) decodeRawHeaderSample(record *sflow.SampledHeader) (map[string]interface{}, error) {
var packet gopacket.Packet
switch record.Protocol {
case 1: // ETHERNET-ISO8023
packet = gopacket.NewPacket(record.HeaderData, layers.LayerTypeEthernet, gopacket.Default)
case 2: // ISO88024-TOKENBUS
fallthrough
case 3: // ISO88025-TOKENRING
fallthrough
case 4: // FDDI
fallthrough
case 5: // FRAME-RELAY
fallthrough
case 6: // X25
fallthrough
case 7: // PPP
fallthrough
case 8: // SMDS
fallthrough
case 9: // AAL5
fallthrough
case 10: // AAL5-IP
fallthrough
case 11: // IPv4
fallthrough
case 12: // IPv6
fallthrough
case 13: // MPLS
fallthrough
default:
return nil, fmt.Errorf("unhandled protocol %d", record.Protocol)
}
fields := make(map[string]interface{})
for _, pkt := range packet.Layers() {
switch l := pkt.(type) {
case *layers.Ethernet:
fields["in_src_mac"] = l.SrcMAC
fields["out_dst_mac"] = l.DstMAC
fields["datalink_frame_type"] = l.EthernetType.String()
if l.Length > 0 {
fields["eth_header_len"] = l.Length
}
case *layers.Dot1Q:
fields["vlan_id"] = l.VLANIdentifier
fields["vlan_priority"] = l.Priority
fields["vlan_drop_eligible"] = l.DropEligible
case *layers.IPv4:
fields["ip_version"] = l.Version
fields["ipv4_inet_header_len"] = l.IHL
fields["src_tos"] = l.TOS
fields["ipv4_total_len"] = l.Length
fields["ipv4_id"] = l.Id // ?
fields["ttl"] = l.TTL
fields["protocol"] = mapL4Proto(uint8(l.Protocol))
fields["src"] = l.SrcIP.String()
fields["dst"] = l.DstIP.String()
flags := []byte("........")
switch {
case l.Flags&layers.IPv4EvilBit > 0:
flags[7] = byte('E')
case l.Flags&layers.IPv4DontFragment > 0:
flags[6] = byte('D')
case l.Flags&layers.IPv4MoreFragments > 0:
flags[5] = byte('M')
}
fields["fragment_flags"] = string(flags)
fields["fragment_offset"] = l.FragOffset
fields["ip_total_len"] = l.Length
case *layers.IPv6:
fields["ip_version"] = l.Version
fields["ipv6_total_len"] = l.Length
fields["ttl"] = l.HopLimit
fields["protocol"] = mapL4Proto(uint8(l.NextHeader))
fields["src"] = l.SrcIP.String()
fields["dst"] = l.DstIP.String()
fields["ip_total_len"] = l.Length
case *layers.TCP:
fields["src_port"] = l.SrcPort
fields["dst_port"] = l.DstPort
fields["tcp_seq_number"] = l.Seq
fields["tcp_ack_number"] = l.Ack
fields["tcp_window_size"] = l.Window
fields["tcp_urgent_ptr"] = l.Urgent
flags := []byte("........")
switch {
case l.FIN:
flags[7] = byte('F')
case l.SYN:
flags[6] = byte('S')
case l.RST:
flags[5] = byte('R')
case l.PSH:
flags[4] = byte('P')
case l.ACK:
flags[3] = byte('A')
case l.URG:
flags[2] = byte('U')
case l.ECE:
flags[1] = byte('E')
case l.CWR:
flags[0] = byte('C')
}
fields["tcp_flags"] = string(flags)
case *layers.UDP:
fields["src_port"] = l.SrcPort
fields["dst_port"] = l.DstPort
fields["ip_total_len"] = l.Length
case *gopacket.Payload:
// Ignore the payload
default:
ltype := int64(pkt.LayerType())
if !d.warnedFlowRaw[ltype] {
contents := hex.EncodeToString(pkt.LayerContents())
payload := hex.EncodeToString(pkt.LayerPayload())
d.Log.Warnf("Unknown flow raw flow message %s (%d):", pkt.LayerType().String(), pkt.LayerType())
d.Log.Warnf(" contents: %s", contents)
d.Log.Warnf(" payload: %s", payload)
d.Log.Warn("This message is only printed once.")
}
d.warnedFlowRaw[ltype] = true
}
}
return fields, nil
}
func (d *sflowv5Decoder) decodeCounterRecords(records []sflow.CounterRecord) (map[string]interface{}, error) {
for _, r := range records {
if r.Data == nil {
continue
}
switch record := r.Data.(type) {
case sflow.IfCounters:
fields := map[string]interface{}{
"interface": record.IfIndex,
"interface_type": record.IfType,
"speed": record.IfSpeed,
"in_bytes": record.IfInOctets,
"in_unicast_packets_total": record.IfInUcastPkts,
"in_mcast_packets_total": record.IfInMulticastPkts,
"in_broadcast_packets_total": record.IfInBroadcastPkts,
"in_dropped_packets": record.IfInDiscards,
"in_errors": record.IfInErrors,
"in_unknown_protocol": record.IfInUnknownProtos,
"out_bytes": record.IfOutOctets,
"out_unicast_packets_total": record.IfOutUcastPkts,
"out_mcast_packets_total": record.IfOutMulticastPkts,
"out_broadcast_packets_total": record.IfOutBroadcastPkts,
"out_dropped_packets": record.IfOutDiscards,
"out_errors": record.IfOutErrors,
"promiscuous": record.IfPromiscuousMode,
}
if record.IfStatus == 0 {
fields["status"] = "down"
} else {
fields["status"] = "up"
}
return fields, nil
case sflow.EthernetCounters:
fields := map[string]interface{}{
"type": "IEEE 802.3",
"collision_frames_single": record.Dot3StatsSingleCollisionFrames,
"collision_frames_multi": record.Dot3StatsMultipleCollisionFrames,
"collisions_late": record.Dot3StatsLateCollisions,
"collisions_excessive": record.Dot3StatsExcessiveCollisions,
"deferred": record.Dot3StatsDeferredTransmissions,
"errors_alignment": record.Dot3StatsAlignmentErrors,
"errors_fcs": record.Dot3StatsFCSErrors,
"errors_sqetest": record.Dot3StatsSQETestErrors,
"errors_internal_mac_tx": record.Dot3StatsInternalMacTransmitErrors,
"errors_internal_mac_rx": record.Dot3StatsInternalMacReceiveErrors,
"errors_carrier_sense": record.Dot3StatsCarrierSenseErrors,
"errors_frame_too_long": record.Dot3StatsFrameTooLongs,
"errors_symbols": record.Dot3StatsSymbolErrors,
}
return fields, nil
case sflow.RawRecord:
switch r.Header.DataFormat {
case 1005:
// Openflow port-name
if len(record.Data) < 4 {
return nil, fmt.Errorf("invalid data for raw counter %+v", r)
}
fields := map[string]interface{}{
"port_name": string(record.Data[4:]),
}
return fields, nil
default:
if !d.warnedCounterRaw[r.Header.DataFormat] {
data := hex.EncodeToString(record.Data)
d.Log.Warnf("Unknown counter raw flow message %d: %s", r.Header.DataFormat, data)
d.Log.Warn("This message is only printed once.")
}
d.warnedCounterRaw[r.Header.DataFormat] = true
}
default:
return nil, fmt.Errorf("unhandled counter record type %T", r.Data)
}
}
return nil, nil
}