.examples
.github
alerting
client
config
controller
core
docs
jsonpath
metrics
pattern
security
storage
test
util
vendor
github.com
TwiN
beorn7
cespare
coreos
go-ping
golang
google
gorilla
kballard
lib
mattn
matttproud
miekg
prometheus
client_golang
client_model
common
procfs
internal
.gitignore
.golangci.yml
CODE_OF_CONDUCT.md
CONTRIBUTING.md
LICENSE
MAINTAINERS.md
Makefile
Makefile.common
NOTICE
README.md
SECURITY.md
arp.go
buddyinfo.go
cmdline.go
cpuinfo.go
cpuinfo_armx.go
cpuinfo_mipsx.go
cpuinfo_others.go
cpuinfo_ppcx.go
cpuinfo_riscvx.go
cpuinfo_s390x.go
cpuinfo_x86.go
crypto.go
doc.go
fixtures.ttar
fs.go
fscache.go
ipvs.go
kernel_random.go
loadavg.go
mdstat.go
meminfo.go
mountinfo.go
mountstats.go
net_conntrackstat.go
net_dev.go
net_ip_socket.go
net_protocols.go
net_sockstat.go
net_softnet.go
net_tcp.go
net_udp.go
net_unix.go
netstat.go
proc.go
proc_cgroup.go
proc_environ.go
proc_fdinfo.go
proc_io.go
proc_limits.go
proc_maps.go
proc_ns.go
proc_psi.go
proc_smaps.go
proc_stat.go
proc_status.go
schedstat.go
slab.go
stat.go
swaps.go
ttar
vm.go
xfrm.go
zoneinfo.go
remyoudompheng
wcharczuk
golang.org
google.golang.org
gopkg.in
lukechampine.com
modernc.org
modules.txt
watchdog
web
.dockerignore
.gitattributes
.gitignore
Dockerfile
LICENSE
Makefile
README.md
config.yaml
go.mod
go.sum
main.go
181 lines
5.4 KiB
Go
181 lines
5.4 KiB
Go
// Copyright 2020 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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package procfs
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import (
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"bufio"
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"bytes"
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"fmt"
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"strconv"
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"strings"
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"github.com/prometheus/procfs/internal/util"
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)
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// NetProtocolStats stores the contents from /proc/net/protocols
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type NetProtocolStats map[string]NetProtocolStatLine
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// NetProtocolStatLine contains a single line parsed from /proc/net/protocols. We
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// only care about the first six columns as the rest are not likely to change
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// and only serve to provide a set of capabilities for each protocol.
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type NetProtocolStatLine struct {
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Name string // 0 The name of the protocol
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Size uint64 // 1 The size, in bytes, of a given protocol structure. e.g. sizeof(struct tcp_sock) or sizeof(struct unix_sock)
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Sockets int64 // 2 Number of sockets in use by this protocol
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Memory int64 // 3 Number of 4KB pages allocated by all sockets of this protocol
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Pressure int // 4 This is either yes, no, or NI (not implemented). For the sake of simplicity we treat NI as not experiencing memory pressure.
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MaxHeader uint64 // 5 Protocol specific max header size
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Slab bool // 6 Indicates whether or not memory is allocated from the SLAB
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ModuleName string // 7 The name of the module that implemented this protocol or "kernel" if not from a module
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Capabilities NetProtocolCapabilities
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}
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// NetProtocolCapabilities contains a list of capabilities for each protocol
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type NetProtocolCapabilities struct {
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Close bool // 8
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Connect bool // 9
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Disconnect bool // 10
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Accept bool // 11
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IoCtl bool // 12
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Init bool // 13
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Destroy bool // 14
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Shutdown bool // 15
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SetSockOpt bool // 16
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GetSockOpt bool // 17
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SendMsg bool // 18
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RecvMsg bool // 19
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SendPage bool // 20
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Bind bool // 21
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BacklogRcv bool // 22
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Hash bool // 23
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UnHash bool // 24
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GetPort bool // 25
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EnterMemoryPressure bool // 26
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}
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// NetProtocols reads stats from /proc/net/protocols and returns a map of
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// PortocolStatLine entries. As of this writing no official Linux Documentation
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// exists, however the source is fairly self-explanatory and the format seems
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// stable since its introduction in 2.6.12-rc2
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// Linux 2.6.12-rc2 - https://elixir.bootlin.com/linux/v2.6.12-rc2/source/net/core/sock.c#L1452
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// Linux 5.10 - https://elixir.bootlin.com/linux/v5.10.4/source/net/core/sock.c#L3586
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func (fs FS) NetProtocols() (NetProtocolStats, error) {
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data, err := util.ReadFileNoStat(fs.proc.Path("net/protocols"))
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if err != nil {
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return NetProtocolStats{}, err
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}
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return parseNetProtocols(bufio.NewScanner(bytes.NewReader(data)))
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}
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func parseNetProtocols(s *bufio.Scanner) (NetProtocolStats, error) {
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nps := NetProtocolStats{}
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// Skip the header line
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s.Scan()
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for s.Scan() {
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line, err := nps.parseLine(s.Text())
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if err != nil {
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return NetProtocolStats{}, err
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}
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nps[line.Name] = *line
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}
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return nps, nil
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}
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func (ps NetProtocolStats) parseLine(rawLine string) (*NetProtocolStatLine, error) {
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line := &NetProtocolStatLine{Capabilities: NetProtocolCapabilities{}}
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var err error
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const enabled = "yes"
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const disabled = "no"
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fields := strings.Fields(rawLine)
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line.Name = fields[0]
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line.Size, err = strconv.ParseUint(fields[1], 10, 64)
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if err != nil {
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return nil, err
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}
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line.Sockets, err = strconv.ParseInt(fields[2], 10, 64)
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if err != nil {
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return nil, err
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}
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line.Memory, err = strconv.ParseInt(fields[3], 10, 64)
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if err != nil {
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return nil, err
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}
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if fields[4] == enabled {
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line.Pressure = 1
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} else if fields[4] == disabled {
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line.Pressure = 0
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} else {
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line.Pressure = -1
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}
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line.MaxHeader, err = strconv.ParseUint(fields[5], 10, 64)
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if err != nil {
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return nil, err
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}
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if fields[6] == enabled {
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line.Slab = true
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} else if fields[6] == disabled {
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line.Slab = false
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} else {
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return nil, fmt.Errorf("unable to parse capability for protocol: %s", line.Name)
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}
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line.ModuleName = fields[7]
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err = line.Capabilities.parseCapabilities(fields[8:])
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if err != nil {
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return nil, err
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}
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return line, nil
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}
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func (pc *NetProtocolCapabilities) parseCapabilities(capabilities []string) error {
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// The capabilities are all bools so we can loop over to map them
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capabilityFields := [...]*bool{
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&pc.Close,
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&pc.Connect,
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&pc.Disconnect,
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&pc.Accept,
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&pc.IoCtl,
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&pc.Init,
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&pc.Destroy,
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&pc.Shutdown,
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&pc.SetSockOpt,
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&pc.GetSockOpt,
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&pc.SendMsg,
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&pc.RecvMsg,
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&pc.SendPage,
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&pc.Bind,
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&pc.BacklogRcv,
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&pc.Hash,
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&pc.UnHash,
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&pc.GetPort,
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&pc.EnterMemoryPressure,
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}
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for i := 0; i < len(capabilities); i++ {
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if capabilities[i] == "y" {
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*capabilityFields[i] = true
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} else if capabilities[i] == "n" {
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*capabilityFields[i] = false
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} else {
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return fmt.Errorf("unable to parse capability block for protocol: position %d", i)
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}
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}
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return nil
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}
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