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github.com/jsimonetti/rtnetlink provides a high level rtnl wrapper around the lower level rtnetlink functions, which essentially does all that we need. The rtnl.Conn.Neighbors uses an internal cache for resolving interface indexes to names, so it makes at most one rtnetlink call per interface to resolve the name. Using this high level wrapper hugely simplifies our code and makes it easier to understand and maintain. Fixes: #3075 Signed-off-by: Daniel Swarbrick <daniel.swarbrick@gmail.com>
132 lines
3.5 KiB
Go
132 lines
3.5 KiB
Go
// Copyright 2017 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !noarp
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// +build !noarp
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package collector
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import (
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"fmt"
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"log/slog"
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"github.com/alecthomas/kingpin/v2"
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"github.com/jsimonetti/rtnetlink/v2/rtnl"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/procfs"
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"golang.org/x/sys/unix"
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)
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var (
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arpDeviceInclude = kingpin.Flag("collector.arp.device-include", "Regexp of arp devices to include (mutually exclusive to device-exclude).").String()
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arpDeviceExclude = kingpin.Flag("collector.arp.device-exclude", "Regexp of arp devices to exclude (mutually exclusive to device-include).").String()
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arpNetlink = kingpin.Flag("collector.arp.netlink", "Use netlink to gather stats instead of /proc/net/arp.").Default("true").Bool()
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)
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type arpCollector struct {
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fs procfs.FS
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deviceFilter deviceFilter
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entries *prometheus.Desc
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logger *slog.Logger
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}
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func init() {
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registerCollector("arp", defaultEnabled, NewARPCollector)
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}
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// NewARPCollector returns a new Collector exposing ARP stats.
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func NewARPCollector(logger *slog.Logger) (Collector, error) {
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fs, err := procfs.NewFS(*procPath)
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if err != nil {
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return nil, fmt.Errorf("failed to open procfs: %w", err)
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}
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return &arpCollector{
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fs: fs,
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deviceFilter: newDeviceFilter(*arpDeviceExclude, *arpDeviceInclude),
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entries: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "arp", "entries"),
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"ARP entries by device",
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[]string{"device"}, nil,
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),
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logger: logger,
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}, nil
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}
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func getTotalArpEntries(deviceEntries []procfs.ARPEntry) map[string]uint32 {
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entries := make(map[string]uint32)
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for _, device := range deviceEntries {
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entries[device.Device]++
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}
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return entries
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}
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func getTotalArpEntriesRTNL() (map[string]uint32, error) {
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conn, err := rtnl.Dial(nil)
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if err != nil {
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return nil, err
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}
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defer conn.Close()
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// Neighbors will also contain IPv6 neighbors, but since this is purely an ARP collector,
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// restrict to AF_INET.
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neighbors, err := conn.Neighbours(nil, unix.AF_INET)
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if err != nil {
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return nil, err
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}
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// Map of interface name to ARP neighbor count.
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entries := make(map[string]uint32)
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for _, n := range neighbors {
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// Skip entries which have state NUD_NOARP to conform to output of /proc/net/arp.
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if n.State&unix.NUD_NOARP == 0 {
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entries[n.Interface.Name]++
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}
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}
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return entries, nil
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}
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func (c *arpCollector) Update(ch chan<- prometheus.Metric) error {
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var enumeratedEntry map[string]uint32
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if *arpNetlink {
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var err error
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enumeratedEntry, err = getTotalArpEntriesRTNL()
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if err != nil {
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return fmt.Errorf("could not get ARP entries: %w", err)
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}
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} else {
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entries, err := c.fs.GatherARPEntries()
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if err != nil {
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return fmt.Errorf("could not get ARP entries: %w", err)
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}
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enumeratedEntry = getTotalArpEntries(entries)
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}
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for device, entryCount := range enumeratedEntry {
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if c.deviceFilter.ignored(device) {
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continue
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}
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ch <- prometheus.MustNewConstMetric(
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c.entries, prometheus.GaugeValue, float64(entryCount), device)
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}
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return nil
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}
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