mirror of
https://github.com/prometheus/node_exporter.git
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Optionally fetch ARP stats via rtnetlink instead of procfs (#2777)
* Optionally fetch ARP stats via rtnetlink instead of procfs Implement collection of ARP stats via rtnetlink to work around shortcomings in the output of /proc/net/arp, which truncates InfiniBand link-layer addresses. Fixes: #2776 --------- Signed-off-by: Daniel Swarbrick <daniel.swarbrick@gmail.com> Co-authored-by: Ben Kochie <superq@gmail.com>
This commit is contained in:
Daniel Swarbrick
GitHub
parent
cda1d820bb
commit
685b98ec7f
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@ -17,16 +17,22 @@
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package collector
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import (
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"errors"
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"fmt"
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"net"
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"github.com/alecthomas/kingpin/v2"
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"github.com/go-kit/log"
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"github.com/jsimonetti/rtnetlink"
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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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@ -69,13 +75,65 @@ func getTotalArpEntries(deviceEntries []procfs.ARPEntry) map[string]uint32 {
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return entries
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}
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func (c *arpCollector) Update(ch chan<- prometheus.Metric) error {
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entries, err := c.fs.GatherARPEntries()
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func getTotalArpEntriesRTNL() (map[string]uint32, error) {
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conn, err := rtnetlink.Dial(nil)
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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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return nil, err
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}
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defer conn.Close()
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neighbors, err := conn.Neigh.List()
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if err != nil {
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return nil, err
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}
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enumeratedEntry := getTotalArpEntries(entries)
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ifIndexEntries := make(map[uint32]uint32)
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for _, n := range neighbors {
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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. Also skip entries which have state NUD_NOARP to conform to output
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// of /proc/net/arp.
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if n.Family == unix.AF_INET && n.State&unix.NUD_NOARP == 0 {
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ifIndexEntries[n.Index]++
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}
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}
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enumEntries := make(map[string]uint32)
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// Convert interface indexes to names.
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for ifIndex, entryCount := range ifIndexEntries {
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iface, err := net.InterfaceByIndex(int(ifIndex))
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if err != nil {
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if errors.Unwrap(err).Error() == "no such network interface" {
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continue
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}
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return nil, err
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}
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enumEntries[iface.Name] = entryCount
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}
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return enumEntries, 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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@ -132,6 +132,7 @@ fi
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--collector.qdisc.fixtures="collector/fixtures/qdisc/" \
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--collector.qdisc.device-include="(wlan0|eth0)" \
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--collector.arp.device-exclude="nope" \
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--no-collector.arp.netlink \
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--collector.hwmon.chip-include="(applesmc|coretemp|hwmon4|nct6779)" \
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--collector.netclass.ignored-devices="(dmz|int)" \
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--collector.netclass.ignore-invalid-speed \
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4
go.mod
4
go.mod
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@ -14,7 +14,7 @@ require (
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github.com/hodgesds/perf-utils v0.7.0
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github.com/illumos/go-kstat v0.0.0-20210513183136-173c9b0a9973
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github.com/josharian/native v1.1.0
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github.com/jsimonetti/rtnetlink v1.3.4
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github.com/jsimonetti/rtnetlink v1.3.5
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github.com/lufia/iostat v1.2.1
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github.com/mattn/go-xmlrpc v0.0.3
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github.com/mdlayher/ethtool v0.1.0
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@ -29,7 +29,7 @@ require (
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github.com/prometheus/procfs v0.11.1
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github.com/safchain/ethtool v0.3.0
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golang.org/x/exp v0.0.0-20230522175609-2e198f4a06a1
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golang.org/x/sys v0.10.0
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golang.org/x/sys v0.11.0
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howett.net/plist v1.0.0
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)
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9
go.sum
9
go.sum
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@ -8,7 +8,7 @@ github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
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github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
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github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
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github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
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github.com/cilium/ebpf v0.10.0 h1:nk5HPMeoBXtOzbkZBWym+ZWq1GIiHUsBFXxwewXAHLQ=
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github.com/cilium/ebpf v0.11.0 h1:V8gS/bTCCjX9uUnkUFUpPsksM8n1lXBAvHcpiFk1X2Y=
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github.com/coreos/go-systemd/v22 v22.5.0 h1:RrqgGjYQKalulkV8NGVIfkXQf6YYmOyiJKk8iXXhfZs=
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github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
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github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
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@ -47,8 +47,8 @@ github.com/josharian/native v1.1.0 h1:uuaP0hAbW7Y4l0ZRQ6C9zfb7Mg1mbFKry/xzDAfmtL
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github.com/josharian/native v1.1.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
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github.com/jpillora/backoff v1.0.0 h1:uvFg412JmmHBHw7iwprIxkPMI+sGQ4kzOWsMeHnm2EA=
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github.com/jpillora/backoff v1.0.0/go.mod h1:J/6gKK9jxlEcS3zixgDgUAsiuZ7yrSoa/FX5e0EB2j4=
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github.com/jsimonetti/rtnetlink v1.3.4 h1:uUcd9SE8sQe/enLBEVaWDkgGYWNsX3EU4eIxbEZYmF0=
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github.com/jsimonetti/rtnetlink v1.3.4/go.mod h1:jGCNm5lJdGplEXKCVwqhQ5tRIGV0dNREhLyNWVzBxHc=
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github.com/jsimonetti/rtnetlink v1.3.5 h1:hVlNQNRlLDGZz31gBPicsG7Q53rnlsz1l1Ix/9XlpVA=
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github.com/jsimonetti/rtnetlink v1.3.5/go.mod h1:0LFedyiTkebnd43tE4YAkWGIq9jQphow4CcwxaT2Y00=
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github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
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github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
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github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
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@ -141,8 +141,9 @@ golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.9.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.10.0 h1:SqMFp9UcQJZa+pmYuAKjd9xq1f0j5rLcDIk0mj4qAsA=
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golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.11.0 h1:eG7RXZHdqOJ1i+0lgLgCpSXAp6M3LYlAo6osgSi0xOM=
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golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
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golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
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golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
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