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// Copyright 2015 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 !notcpstat
// +build !notcpstat
package collector
import (
"fmt"
"log/slog"
"os"
"syscall"
"unsafe"
"github.com/mdlayher/netlink"
"github.com/prometheus/client_golang/prometheus"
)
type tcpConnectionState int
const (
// TCP_ESTABLISHED
tcpEstablished tcpConnectionState = iota + 1
// TCP_SYN_SENT
tcpSynSent
// TCP_SYN_RECV
tcpSynRecv
// TCP_FIN_WAIT1
tcpFinWait1
// TCP_FIN_WAIT2
tcpFinWait2
// TCP_TIME_WAIT
tcpTimeWait
// TCP_CLOSE
tcpClose
// TCP_CLOSE_WAIT
tcpCloseWait
// TCP_LAST_ACK
tcpLastAck
// TCP_LISTEN
tcpListen
// TCP_CLOSING
tcpClosing
// TCP_RX_BUFFER
tcpRxQueuedBytes
// TCP_TX_BUFFER
tcpTxQueuedBytes
)
type tcpStatCollector struct {
desc typedDesc
logger *slog.Logger
}
func init() {
registerCollector("tcpstat", defaultDisabled, NewTCPStatCollector)
}
// NewTCPStatCollector returns a new Collector exposing network stats.
func NewTCPStatCollector(logger *slog.Logger) (Collector, error) {
return &tcpStatCollector{
desc: typedDesc{prometheus.NewDesc(
prometheus.BuildFQName(namespace, "tcp", "connection_states"),
"Number of connection states.",
[]string{"state"}, nil,
), prometheus.GaugeValue},
logger: logger,
}, nil
}
// InetDiagSockID (inet_diag_sockid) contains the socket identity.
// https://github.com/torvalds/linux/blob/v4.0/include/uapi/linux/inet_diag.h#L13
type InetDiagSockID struct {
SourcePort [2]byte
DestPort [2]byte
SourceIP [4][4]byte
DestIP [4][4]byte
Interface uint32
Cookie [2]uint32
}
// InetDiagReqV2 (inet_diag_req_v2) is used to request diagnostic data.
// https://github.com/torvalds/linux/blob/v4.0/include/uapi/linux/inet_diag.h#L37
type InetDiagReqV2 struct {
Family uint8
Protocol uint8
Ext uint8
Pad uint8
States uint32
ID InetDiagSockID
}
const sizeOfDiagRequest = 0x38
func (req *InetDiagReqV2) Serialize() []byte {
return (*(*[sizeOfDiagRequest]byte)(unsafe.Pointer(req)))[:]
}
func (req *InetDiagReqV2) Len() int {
return sizeOfDiagRequest
}
type InetDiagMsg struct {
Family uint8
State uint8
Timer uint8
Retrans uint8
ID InetDiagSockID
Expires uint32
RQueue uint32
WQueue uint32
UID uint32
Inode uint32
}
func parseInetDiagMsg(b []byte) *InetDiagMsg {
return (*InetDiagMsg)(unsafe.Pointer(&b[0]))
}
func (c *tcpStatCollector) Update(ch chan<- prometheus.Metric) error {
tcpStats, err := getTCPStats(syscall.AF_INET)
if err != nil {
return fmt.Errorf("couldn't get tcpstats: %w", err)
}
// if enabled ipv6 system
if _, hasIPv6 := os.Stat(procFilePath("net/tcp6")); hasIPv6 == nil {
tcp6Stats, err := getTCPStats(syscall.AF_INET6)
if err != nil {
return fmt.Errorf("couldn't get tcp6stats: %w", err)
}
for st, value := range tcp6Stats {
tcpStats[st] += value
}
}
for st, value := range tcpStats {
ch <- c.desc.mustNewConstMetric(value, st.String())
}
return nil
}
func getTCPStats(family uint8) (map[tcpConnectionState]float64, error) {
const TCPFAll = 0xFFF
const InetDiagInfo = 2
const SockDiagByFamily = 20
conn, err := netlink.Dial(syscall.NETLINK_INET_DIAG, nil)
if err != nil {
return nil, fmt.Errorf("couldn't connect netlink: %w", err)
}
defer conn.Close()
msg := netlink.Message{
Header: netlink.Header{
Type: SockDiagByFamily,
Flags: syscall.NLM_F_REQUEST | syscall.NLM_F_DUMP,
},
Data: (&InetDiagReqV2{
Family: family,
Protocol: syscall.IPPROTO_TCP,
States: TCPFAll,
Ext: 0 | 1<<(InetDiagInfo-1),
}).Serialize(),
}
messages, err := conn.Execute(msg)
if err != nil {
return nil, err
}
return parseTCPStats(messages)
}
func parseTCPStats(msgs []netlink.Message) (map[tcpConnectionState]float64, error) {
tcpStats := map[tcpConnectionState]float64{}
for _, m := range msgs {
msg := parseInetDiagMsg(m.Data)
tcpStats[tcpTxQueuedBytes] += float64(msg.WQueue)
tcpStats[tcpRxQueuedBytes] += float64(msg.RQueue)
tcpStats[tcpConnectionState(msg.State)]++
}
return tcpStats, nil
}
func (st tcpConnectionState) String() string {
switch st {
case tcpEstablished:
return "established"
case tcpSynSent:
return "syn_sent"
case tcpSynRecv:
return "syn_recv"
case tcpFinWait1:
return "fin_wait1"
case tcpFinWait2:
return "fin_wait2"
case tcpTimeWait:
return "time_wait"
case tcpClose:
return "close"
case tcpCloseWait:
return "close_wait"
case tcpLastAck:
return "last_ack"
case tcpListen:
return "listen"
case tcpClosing:
return "closing"
case tcpRxQueuedBytes:
return "rx_queued_bytes"
case tcpTxQueuedBytes:
return "tx_queued_bytes"
default:
return "unknown"
}
}
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