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// Copyright 2020 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build !nonetworkroute
// +build !nonetworkroute
package collector
import (
"fmt"
"log/slog"
"net"
"strconv"
"github.com/jsimonetti/rtnetlink/v2"
"github.com/prometheus/client_golang/prometheus"
"golang.org/x/sys/unix"
)
type networkRouteCollector struct {
routeInfoDesc *prometheus.Desc
routesDesc *prometheus.Desc
logger *slog.Logger
}
func init() {
registerCollector("network_route", defaultDisabled, NewNetworkRouteCollector)
}
// NewNetworkRouteCollector returns a new Collector exposing systemd statistics.
func NewNetworkRouteCollector(logger *slog.Logger) (Collector, error) {
const subsystem = "network"
routeInfoDesc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "route_info"),
"network routing table information", []string{"device", "src", "dest", "gw", "priority", "proto", "weight"}, nil,
)
routesDesc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "routes"),
"network routes by interface", []string{"device"}, nil,
)
return &networkRouteCollector{
routeInfoDesc: routeInfoDesc,
routesDesc: routesDesc,
logger: logger,
}, nil
}
func (n networkRouteCollector) Update(ch chan<- prometheus.Metric) error {
deviceRoutes := make(map[string]int)
conn, err := rtnetlink.Dial(nil)
if err != nil {
return fmt.Errorf("couldn't connect rtnetlink: %w", err)
}
defer conn.Close()
links, err := conn.Link.List()
if err != nil {
return fmt.Errorf("couldn't get links: %w", err)
}
routes, err := conn.Route.List()
if err != nil {
return fmt.Errorf("couldn't get routes: %w", err)
}
for _, route := range routes {
if route.Type != unix.RTA_DST {
continue
}
if len(route.Attributes.Multipath) != 0 {
for _, nextHop := range route.Attributes.Multipath {
ifName := ""
for _, link := range links {
if link.Index == nextHop.Hop.IfIndex {
ifName = link.Attributes.Name
break
}
}
labels := []string{
ifName, // if
networkRouteIPToString(route.Attributes.Src), // src
networkRouteIPWithPrefixToString(route.Attributes.Dst, route.DstLength), // dest
networkRouteIPToString(nextHop.Gateway), // gw
strconv.FormatUint(uint64(route.Attributes.Priority), 10), // priority(metrics)
networkRouteProtocolToString(route.Protocol), // proto
strconv.Itoa(int(nextHop.Hop.Hops) + 1), // weight
}
ch <- prometheus.MustNewConstMetric(n.routeInfoDesc, prometheus.GaugeValue, 1, labels...)
deviceRoutes[ifName]++
}
} else {
ifName := ""
for _, link := range links {
if link.Index == route.Attributes.OutIface {
ifName = link.Attributes.Name
break
}
}
labels := []string{
ifName, // if
networkRouteIPToString(route.Attributes.Src), // src
networkRouteIPWithPrefixToString(route.Attributes.Dst, route.DstLength), // dest
networkRouteIPToString(route.Attributes.Gateway), // gw
strconv.FormatUint(uint64(route.Attributes.Priority), 10), // priority(metrics)
networkRouteProtocolToString(route.Protocol), // proto
"", // weight
}
ch <- prometheus.MustNewConstMetric(n.routeInfoDesc, prometheus.GaugeValue, 1, labels...)
deviceRoutes[ifName]++
}
}
for dev, total := range deviceRoutes {
ch <- prometheus.MustNewConstMetric(n.routesDesc, prometheus.GaugeValue, float64(total), dev)
}
return nil
}
func networkRouteIPWithPrefixToString(ip net.IP, len uint8) string {
if len == 0 {
return "default"
}
iplen := net.IPv4len
if ip.To4() == nil {
iplen = net.IPv6len
}
network := &net.IPNet{
IP: ip,
Mask: net.CIDRMask(int(len), iplen*8),
}
return network.String()
}
func networkRouteIPToString(ip net.IP) string {
if len(ip) == 0 {
return ""
}
return ip.String()
}
func networkRouteProtocolToString(protocol uint8) string {
// from linux kernel 'include/uapi/linux/rtnetlink.h'
switch protocol {
case 0:
return "unspec"
case 1:
return "redirect"
case 2:
return "kernel"
case 3:
return "boot"
case 4:
return "static"
case 8:
return "gated"
case 9:
return "ra"
case 10:
return "mrt"
case 11:
return "zebra"
case 12:
return "bird"
case 13:
return "dnrouted"
case 14:
return "xorp"
case 15:
return "ntk"
case 16:
return "dhcp"
case 17:
return "mrouted"
case 42:
return "babel"
case 186:
return "bgp"
case 187:
return "isis"
case 188:
return "ospf"
case 189:
return "rip"
case 192:
return "eigrp"
}
return "unknown"
}
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