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initial commit

main
Nicolas Massé 4 years ago
commit
3c6cabf03d
  1. 5
      README.md
  2. 8
      go.mod
  3. 253
      go.sum
  4. 106
      main.go
  5. 31
      test.nft

5
README.md

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# Nftables counter exporter
A prometheus exporter that exposes nftables counters.
**WORK IN PROGRESS**

8
go.mod

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module github.com/nmasse-itix/nft-ipv4-ipv6-counter
go 1.16
require (
github.com/google/nftables v0.0.0-20211209220838-6f19c4381e13 // indirect
github.com/prometheus/client_golang v1.11.0 // indirect
)

253
go.sum

@ -0,0 +1,253 @@
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/BurntSushi/toml v0.4.1 h1:GaI7EiDXDRfa8VshkTj7Fym7ha+y8/XxIgD2okUIjLw=
github.com/BurntSushi/toml v0.4.1/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
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github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
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gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
honnef.co/go/tools v0.2.1/go.mod h1:lPVVZ2BS5TfnjLyizF7o7hv7j9/L+8cZY2hLyjP9cGY=
honnef.co/go/tools v0.2.2 h1:MNh1AVMyVX23VUHE2O27jm6lNj3vjO5DexS4A1xvnzk=
honnef.co/go/tools v0.2.2/go.mod h1:lPVVZ2BS5TfnjLyizF7o7hv7j9/L+8cZY2hLyjP9cGY=

106
main.go

@ -0,0 +1,106 @@
package main
import (
"log"
"net/http"
"strings"
"time"
"github.com/google/nftables"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
var conn nftables.Conn
type nftablesCollector struct {
ipv4Traffic *prometheus.Desc
ipv6Traffic *prometheus.Desc
}
func newNftablesCollector() *nftablesCollector {
return &nftablesCollector{
ipv4Traffic: prometheus.NewDesc("ipv4_traffic_bytes_counter",
"Count how many bytes of IPv4 traffic this router has seen.",
[]string{"direction"}, nil,
),
ipv6Traffic: prometheus.NewDesc("ipv6_traffic_bytes_counter",
"Count how many bytes of IPv6 traffic this router has seen.",
[]string{"direction"}, nil,
),
}
}
func (collector *nftablesCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- collector.ipv4Traffic
ch <- collector.ipv6Traffic
}
func (collector *nftablesCollector) Collect(ch chan<- prometheus.Metric) {
var table nftables.Table = nftables.Table{Name: "ip-counter", Family: nftables.TableFamilyINet}
objects, err := conn.GetObjects(&table)
if err != nil {
log.Println(err)
return
}
matches := 0
for i := range objects {
counter, ok := objects[i].(*nftables.CounterObj)
if !ok {
// not a counter
continue
}
parts := strings.Split(counter.Name, "-")
var desc *prometheus.Desc
if parts[0] == "IPv4" {
desc = collector.ipv4Traffic
} else if parts[0] == "IPv6" {
desc = collector.ipv6Traffic
} else {
continue
}
var direction string
if parts[1] == "In" {
direction = "incoming"
} else if parts[1] == "Out" {
direction = "outgoing"
} else {
continue
}
matches++
bytes := prometheus.MustNewConstMetric(desc, prometheus.CounterValue, float64(counter.Bytes), direction)
ch <- bytes
}
if matches == 0 {
log.Println("Collect: no object matched")
}
}
func main() {
tables, err := conn.ListTables()
if err != nil {
log.Fatal(err)
}
if len(tables) == 0 {
log.Fatal("nftables: no table to show!")
}
registry := prometheus.NewPedanticRegistry()
nftc := newNftablesCollector()
registry.MustRegister(nftc)
var opts promhttp.HandlerOpts
opts.ErrorLog = log.Default()
opts.ErrorHandling = promhttp.HTTPErrorOnError
opts.MaxRequestsInFlight = 5
opts.Timeout = 5 * time.Second
opts.EnableOpenMetrics = true
http.Handle("/metrics", promhttp.HandlerFor(registry, opts))
log.Fatal(http.ListenAndServe(":9101", nil))
}

31
test.nft

@ -0,0 +1,31 @@
#!/usr/sbin/nft -f
#flush table inet ip-counter
#delete table inet ip-counter
table inet ip-counter {
counter IPv6-In {
}
counter IPv6-Out {
}
counter IPv4-In {
}
counter IPv4-Out {
}
chain in {
type filter hook input priority filter; policy accept;
meta nfproto ipv4 iifname != lo counter name IPv4-In
meta nfproto ipv6 iifname != lo counter name IPv6-In
}
chain out {
type filter hook output priority filter; policy accept;
meta nfproto ipv4 iifname != lo counter name IPv4-Out
meta nfproto ipv6 iifname != lo counter name IPv6-Out
}
}
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