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proxier_test.go
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proxier_test.go
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/*
Copyright 2015 The Kubernetes 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.
*/
package iptables
import (
"bytes"
"fmt"
"net"
"reflect"
"sort"
"strconv"
"strings"
"testing"
"time"
"github.com/stretchr/testify/assert"
v1 "k8s.io/api/core/v1"
discovery "k8s.io/api/discovery/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/intstr"
utilfeature "k8s.io/apiserver/pkg/util/feature"
featuregatetesting "k8s.io/component-base/featuregate/testing"
"k8s.io/component-base/metrics/testutil"
"k8s.io/klog/v2"
"k8s.io/kubernetes/pkg/features"
"k8s.io/kubernetes/pkg/proxy"
"k8s.io/kubernetes/pkg/proxy/metrics"
"k8s.io/kubernetes/pkg/proxy/healthcheck"
utilproxy "k8s.io/kubernetes/pkg/proxy/util"
proxyutiliptables "k8s.io/kubernetes/pkg/proxy/util/iptables"
utilproxytest "k8s.io/kubernetes/pkg/proxy/util/testing"
"k8s.io/kubernetes/pkg/util/async"
"k8s.io/kubernetes/pkg/util/conntrack"
utiliptables "k8s.io/kubernetes/pkg/util/iptables"
iptablestest "k8s.io/kubernetes/pkg/util/iptables/testing"
"k8s.io/utils/exec"
fakeexec "k8s.io/utils/exec/testing"
utilnet "k8s.io/utils/net"
utilpointer "k8s.io/utils/pointer"
)
func checkAllLines(t *testing.T, table utiliptables.Table, save []byte, expectedLines map[utiliptables.Chain]string) {
chainLines := utiliptables.GetChainLines(table, save)
for chain, lineBytes := range chainLines {
line := string(lineBytes)
if expected, exists := expectedLines[chain]; exists {
if expected != line {
t.Errorf("getChainLines expected chain line not present. For chain: %s Expected: %s Got: %s", chain, expected, line)
}
} else {
t.Errorf("getChainLines expected chain not present: %s", chain)
}
}
}
func TestGetChainLines(t *testing.T) {
iptablesSave := `# Generated by iptables-save v1.4.7 on Wed Oct 29 14:56:01 2014
*nat
:PREROUTING ACCEPT [2136997:197881818]
:POSTROUTING ACCEPT [4284525:258542680]
:OUTPUT ACCEPT [5901660:357267963]
-A PREROUTING -m addrtype --dst-type LOCAL -j DOCKER
COMMIT
# Completed on Wed Oct 29 14:56:01 2014`
expected := map[utiliptables.Chain]string{
utiliptables.ChainPrerouting: ":PREROUTING ACCEPT [2136997:197881818]",
utiliptables.ChainPostrouting: ":POSTROUTING ACCEPT [4284525:258542680]",
utiliptables.ChainOutput: ":OUTPUT ACCEPT [5901660:357267963]",
}
checkAllLines(t, utiliptables.TableNAT, []byte(iptablesSave), expected)
}
func TestGetChainLinesMultipleTables(t *testing.T) {
iptablesSave := `# Generated by iptables-save v1.4.21 on Fri Aug 7 14:47:37 2015
*nat
:PREROUTING ACCEPT [2:138]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
:DOCKER - [0:0]
:KUBE-NODEPORT-CONTAINER - [0:0]
:KUBE-NODEPORT-HOST - [0:0]
:KUBE-PORTALS-CONTAINER - [0:0]
:KUBE-PORTALS-HOST - [0:0]
:KUBE-SVC-1111111111111111 - [0:0]
:KUBE-SVC-2222222222222222 - [0:0]
:KUBE-SVC-3333333333333333 - [0:0]
:KUBE-SVC-4444444444444444 - [0:0]
:KUBE-SVC-5555555555555555 - [0:0]
:KUBE-SVC-6666666666666666 - [0:0]
-A PREROUTING -m comment --comment "handle ClusterIPs; NOTE: this must be before the NodePort rules" -j KUBE-PORTALS-CONTAINER
-A PREROUTING -m addrtype --dst-type LOCAL -j DOCKER
-A PREROUTING -m addrtype --dst-type LOCAL -m comment --comment "handle service NodePorts; NOTE: this must be the last rule in the chain" -j KUBE-NODEPORT-CONTAINER
-A OUTPUT -m comment --comment "handle ClusterIPs; NOTE: this must be before the NodePort rules" -j KUBE-PORTALS-HOST
-A OUTPUT ! -d 127.0.0.0/8 -m addrtype --dst-type LOCAL -j DOCKER
-A OUTPUT -m addrtype --dst-type LOCAL -m comment --comment "handle service NodePorts; NOTE: this must be the last rule in the chain" -j KUBE-NODEPORT-HOST
-A POSTROUTING -s 10.246.1.0/24 ! -o cbr0 -j MASQUERADE
-A POSTROUTING -s 10.0.2.15/32 -d 10.0.2.15/32 -m comment --comment "handle pod connecting to self" -j MASQUERADE
-A KUBE-PORTALS-CONTAINER -d 10.247.0.1/32 -p tcp -m comment --comment "portal for default/kubernetes:" -m state --state NEW -m tcp --dport 443 -j KUBE-SVC-5555555555555555
-A KUBE-PORTALS-CONTAINER -d 10.247.0.10/32 -p udp -m comment --comment "portal for kube-system/kube-dns:dns" -m state --state NEW -m udp --dport 53 -j KUBE-SVC-6666666666666666
-A KUBE-PORTALS-CONTAINER -d 10.247.0.10/32 -p tcp -m comment --comment "portal for kube-system/kube-dns:dns-tcp" -m state --state NEW -m tcp --dport 53 -j KUBE-SVC-2222222222222222
-A KUBE-PORTALS-HOST -d 10.247.0.1/32 -p tcp -m comment --comment "portal for default/kubernetes:" -m state --state NEW -m tcp --dport 443 -j KUBE-SVC-5555555555555555
-A KUBE-PORTALS-HOST -d 10.247.0.10/32 -p udp -m comment --comment "portal for kube-system/kube-dns:dns" -m state --state NEW -m udp --dport 53 -j KUBE-SVC-6666666666666666
-A KUBE-PORTALS-HOST -d 10.247.0.10/32 -p tcp -m comment --comment "portal for kube-system/kube-dns:dns-tcp" -m state --state NEW -m tcp --dport 53 -j KUBE-SVC-2222222222222222
-A KUBE-SVC-1111111111111111 -p udp -m comment --comment "kube-system/kube-dns:dns" -m recent --set --name KUBE-SVC-1111111111111111 --mask 255.255.255.255 --rsource -j DNAT --to-destination 10.246.1.2:53
-A KUBE-SVC-2222222222222222 -m comment --comment "kube-system/kube-dns:dns-tcp" -j KUBE-SVC-3333333333333333
-A KUBE-SVC-3333333333333333 -p tcp -m comment --comment "kube-system/kube-dns:dns-tcp" -m recent --set --name KUBE-SVC-3333333333333333 --mask 255.255.255.255 --rsource -j DNAT --to-destination 10.246.1.2:53
-A KUBE-SVC-4444444444444444 -p tcp -m comment --comment "default/kubernetes:" -m recent --set --name KUBE-SVC-4444444444444444 --mask 255.255.255.255 --rsource -j DNAT --to-destination 10.245.1.2:443
-A KUBE-SVC-5555555555555555 -m comment --comment "default/kubernetes:" -j KUBE-SVC-4444444444444444
-A KUBE-SVC-6666666666666666 -m comment --comment "kube-system/kube-dns:dns" -j KUBE-SVC-1111111111111111
COMMIT
# Completed on Fri Aug 7 14:47:37 2015
# Generated by iptables-save v1.4.21 on Fri Aug 7 14:47:37 2015
*filter
:INPUT ACCEPT [17514:83115836]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [8909:688225]
:DOCKER - [0:0]
-A FORWARD -o cbr0 -j DOCKER
-A FORWARD -o cbr0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i cbr0 ! -o cbr0 -j ACCEPT
-A FORWARD -i cbr0 -o cbr0 -j ACCEPT
COMMIT
`
expected := map[utiliptables.Chain]string{
utiliptables.ChainPrerouting: ":PREROUTING ACCEPT [2:138]",
utiliptables.Chain("INPUT"): ":INPUT ACCEPT [0:0]",
utiliptables.Chain("OUTPUT"): ":OUTPUT ACCEPT [0:0]",
utiliptables.ChainPostrouting: ":POSTROUTING ACCEPT [0:0]",
utiliptables.Chain("DOCKER"): ":DOCKER - [0:0]",
utiliptables.Chain("KUBE-NODEPORT-CONTAINER"): ":KUBE-NODEPORT-CONTAINER - [0:0]",
utiliptables.Chain("KUBE-NODEPORT-HOST"): ":KUBE-NODEPORT-HOST - [0:0]",
utiliptables.Chain("KUBE-PORTALS-CONTAINER"): ":KUBE-PORTALS-CONTAINER - [0:0]",
utiliptables.Chain("KUBE-PORTALS-HOST"): ":KUBE-PORTALS-HOST - [0:0]",
utiliptables.Chain("KUBE-SVC-1111111111111111"): ":KUBE-SVC-1111111111111111 - [0:0]",
utiliptables.Chain("KUBE-SVC-2222222222222222"): ":KUBE-SVC-2222222222222222 - [0:0]",
utiliptables.Chain("KUBE-SVC-3333333333333333"): ":KUBE-SVC-3333333333333333 - [0:0]",
utiliptables.Chain("KUBE-SVC-4444444444444444"): ":KUBE-SVC-4444444444444444 - [0:0]",
utiliptables.Chain("KUBE-SVC-5555555555555555"): ":KUBE-SVC-5555555555555555 - [0:0]",
utiliptables.Chain("KUBE-SVC-6666666666666666"): ":KUBE-SVC-6666666666666666 - [0:0]",
}
checkAllLines(t, utiliptables.TableNAT, []byte(iptablesSave), expected)
}
func TestDeleteEndpointConnectionsIPv4(t *testing.T) {
const (
UDP = v1.ProtocolUDP
TCP = v1.ProtocolTCP
SCTP = v1.ProtocolSCTP
)
testCases := []struct {
description string
svcName string
svcIP string
svcPort int32
protocol v1.Protocol
endpoint string // IP:port endpoint
epSvcPair proxy.ServiceEndpoint // Will be generated by test
simulatedErr string
}{
{
description: "V4 UDP",
svcName: "v4-udp",
svcIP: "10.96.1.1",
svcPort: 80,
protocol: UDP,
endpoint: "10.240.0.3:80",
},
{
description: "V4 TCP",
svcName: "v4-tcp",
svcIP: "10.96.2.2",
svcPort: 80,
protocol: TCP,
endpoint: "10.240.0.4:80",
},
{
description: "V4 SCTP",
svcName: "v4-sctp",
svcIP: "10.96.3.3",
svcPort: 80,
protocol: SCTP,
endpoint: "10.240.0.5:80",
},
{
description: "V4 UDP, nothing to delete, benign error",
svcName: "v4-udp-nothing-to-delete",
svcIP: "10.96.1.1",
svcPort: 80,
protocol: UDP,
endpoint: "10.240.0.3:80",
simulatedErr: conntrack.NoConnectionToDelete,
},
{
description: "V4 UDP, unexpected error, should be glogged",
svcName: "v4-udp-simulated-error",
svcIP: "10.96.1.1",
svcPort: 80,
protocol: UDP,
endpoint: "10.240.0.3:80",
simulatedErr: "simulated error",
},
}
// Create a fake executor for the conntrack utility. This should only be
// invoked for UDP and SCTP connections, since no conntrack cleanup is needed for TCP
fcmd := fakeexec.FakeCmd{}
fexec := fakeexec.FakeExec{
LookPathFunc: func(cmd string) (string, error) { return cmd, nil },
}
execFunc := func(cmd string, args ...string) exec.Cmd {
return fakeexec.InitFakeCmd(&fcmd, cmd, args...)
}
for _, tc := range testCases {
if conntrack.IsClearConntrackNeeded(tc.protocol) {
var cmdOutput string
var simErr error
if tc.simulatedErr == "" {
cmdOutput = "1 flow entries have been deleted"
} else {
simErr = fmt.Errorf(tc.simulatedErr)
}
cmdFunc := func() ([]byte, []byte, error) { return []byte(cmdOutput), nil, simErr }
fcmd.CombinedOutputScript = append(fcmd.CombinedOutputScript, cmdFunc)
fexec.CommandScript = append(fexec.CommandScript, execFunc)
}
}
ipt := iptablestest.NewFake()
fp := NewFakeProxier(ipt)
fp.exec = &fexec
for _, tc := range testCases {
makeServiceMap(fp,
makeTestService("ns1", tc.svcName, func(svc *v1.Service) {
svc.Spec.ClusterIP = tc.svcIP
svc.Spec.Ports = []v1.ServicePort{{
Name: "p80",
Port: tc.svcPort,
Protocol: tc.protocol,
}}
svc.Spec.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyTypeLocal
}),
)
fp.serviceMap.Update(fp.serviceChanges)
}
// Run the test cases
for _, tc := range testCases {
priorExecs := fexec.CommandCalls
priorGlogErrs := klog.Stats.Error.Lines()
svc := proxy.ServicePortName{
NamespacedName: types.NamespacedName{Namespace: "ns1", Name: tc.svcName},
Port: "p80",
Protocol: tc.protocol,
}
input := []proxy.ServiceEndpoint{
{
Endpoint: tc.endpoint,
ServicePortName: svc,
},
}
fp.deleteEndpointConnections(input)
// For UDP and SCTP connections, check the executed conntrack command
var expExecs int
if conntrack.IsClearConntrackNeeded(tc.protocol) {
isIPv6 := func(ip string) bool {
netIP := net.ParseIP(ip)
return netIP.To4() == nil
}
endpointIP := utilproxy.IPPart(tc.endpoint)
expectCommand := fmt.Sprintf("conntrack -D --orig-dst %s --dst-nat %s -p %s", tc.svcIP, endpointIP, strings.ToLower(string((tc.protocol))))
if isIPv6(endpointIP) {
expectCommand += " -f ipv6"
}
actualCommand := strings.Join(fcmd.CombinedOutputLog[fexec.CommandCalls-1], " ")
if actualCommand != expectCommand {
t.Errorf("%s: Expected command: %s, but executed %s", tc.description, expectCommand, actualCommand)
}
expExecs = 1
}
// Check the number of times conntrack was executed
execs := fexec.CommandCalls - priorExecs
if execs != expExecs {
t.Errorf("%s: Expected conntrack to be executed %d times, but got %d", tc.description, expExecs, execs)
}
// Check the number of new glog errors
var expGlogErrs int64
if tc.simulatedErr != "" && tc.simulatedErr != conntrack.NoConnectionToDelete {
expGlogErrs = 1
}
glogErrs := klog.Stats.Error.Lines() - priorGlogErrs
if glogErrs != expGlogErrs {
t.Errorf("%s: Expected %d glogged errors, but got %d", tc.description, expGlogErrs, glogErrs)
}
}
}
func TestDeleteEndpointConnectionsIPv6(t *testing.T) {
const (
UDP = v1.ProtocolUDP
TCP = v1.ProtocolTCP
SCTP = v1.ProtocolSCTP
)
testCases := []struct {
description string
svcName string
svcIP string
svcPort int32
protocol v1.Protocol
endpoint string // IP:port endpoint
epSvcPair proxy.ServiceEndpoint // Will be generated by test
simulatedErr string
}{
{
description: "V6 UDP",
svcName: "v6-udp",
svcIP: "fd00:1234::20",
svcPort: 80,
protocol: UDP,
endpoint: "[2001:db8::2]:80",
},
{
description: "V6 TCP",
svcName: "v6-tcp",
svcIP: "fd00:1234::30",
svcPort: 80,
protocol: TCP,
endpoint: "[2001:db8::3]:80",
},
{
description: "V6 SCTP",
svcName: "v6-sctp",
svcIP: "fd00:1234::40",
svcPort: 80,
protocol: SCTP,
endpoint: "[2001:db8::4]:80",
},
}
// Create a fake executor for the conntrack utility. This should only be
// invoked for UDP and SCTP connections, since no conntrack cleanup is needed for TCP
fcmd := fakeexec.FakeCmd{}
fexec := fakeexec.FakeExec{
LookPathFunc: func(cmd string) (string, error) { return cmd, nil },
}
execFunc := func(cmd string, args ...string) exec.Cmd {
return fakeexec.InitFakeCmd(&fcmd, cmd, args...)
}
for _, tc := range testCases {
if conntrack.IsClearConntrackNeeded(tc.protocol) {
var cmdOutput string
var simErr error
if tc.simulatedErr == "" {
cmdOutput = "1 flow entries have been deleted"
} else {
simErr = fmt.Errorf(tc.simulatedErr)
}
cmdFunc := func() ([]byte, []byte, error) { return []byte(cmdOutput), nil, simErr }
fcmd.CombinedOutputScript = append(fcmd.CombinedOutputScript, cmdFunc)
fexec.CommandScript = append(fexec.CommandScript, execFunc)
}
}
ipt := iptablestest.NewIPv6Fake()
fp := NewFakeProxier(ipt)
fp.exec = &fexec
for _, tc := range testCases {
makeServiceMap(fp,
makeTestService("ns1", tc.svcName, func(svc *v1.Service) {
svc.Spec.ClusterIP = tc.svcIP
svc.Spec.Ports = []v1.ServicePort{{
Name: "p80",
Port: tc.svcPort,
Protocol: tc.protocol,
}}
svc.Spec.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyTypeLocal
}),
)
fp.serviceMap.Update(fp.serviceChanges)
}
// Run the test cases
for _, tc := range testCases {
priorExecs := fexec.CommandCalls
priorGlogErrs := klog.Stats.Error.Lines()
svc := proxy.ServicePortName{
NamespacedName: types.NamespacedName{Namespace: "ns1", Name: tc.svcName},
Port: "p80",
Protocol: tc.protocol,
}
input := []proxy.ServiceEndpoint{
{
Endpoint: tc.endpoint,
ServicePortName: svc,
},
}
fp.deleteEndpointConnections(input)
// For UDP and SCTP connections, check the executed conntrack command
var expExecs int
if conntrack.IsClearConntrackNeeded(tc.protocol) {
isIPv6 := func(ip string) bool {
netIP := net.ParseIP(ip)
return netIP.To4() == nil
}
endpointIP := utilproxy.IPPart(tc.endpoint)
expectCommand := fmt.Sprintf("conntrack -D --orig-dst %s --dst-nat %s -p %s", tc.svcIP, endpointIP, strings.ToLower(string((tc.protocol))))
if isIPv6(endpointIP) {
expectCommand += " -f ipv6"
}
actualCommand := strings.Join(fcmd.CombinedOutputLog[fexec.CommandCalls-1], " ")
if actualCommand != expectCommand {
t.Errorf("%s: Expected command: %s, but executed %s", tc.description, expectCommand, actualCommand)
}
expExecs = 1
}
// Check the number of times conntrack was executed
execs := fexec.CommandCalls - priorExecs
if execs != expExecs {
t.Errorf("%s: Expected conntrack to be executed %d times, but got %d", tc.description, expExecs, execs)
}
// Check the number of new glog errors
var expGlogErrs int64
if tc.simulatedErr != "" && tc.simulatedErr != conntrack.NoConnectionToDelete {
expGlogErrs = 1
}
glogErrs := klog.Stats.Error.Lines() - priorGlogErrs
if glogErrs != expGlogErrs {
t.Errorf("%s: Expected %d glogged errors, but got %d", tc.description, expGlogErrs, glogErrs)
}
}
}
// fakeCloseable implements utilproxy.Closeable
type fakeCloseable struct{}
// Close fakes out the close() used by syncProxyRules to release a local port.
func (f *fakeCloseable) Close() error {
return nil
}
// fakePortOpener implements portOpener.
type fakePortOpener struct {
openPorts []*utilnet.LocalPort
}
// OpenLocalPort fakes out the listen() and bind() used by syncProxyRules
// to lock a local port.
func (f *fakePortOpener) OpenLocalPort(lp *utilnet.LocalPort) (utilnet.Closeable, error) {
f.openPorts = append(f.openPorts, lp)
return &fakeCloseable{}, nil
}
const testHostname = "test-hostname"
func NewFakeProxier(ipt utiliptables.Interface) *Proxier {
// TODO: Call NewProxier after refactoring out the goroutine
// invocation into a Run() method.
ipfamily := v1.IPv4Protocol
if ipt.IsIPv6() {
ipfamily = v1.IPv6Protocol
}
detectLocal, _ := proxyutiliptables.NewDetectLocalByCIDR("10.0.0.0/24", ipt)
p := &Proxier{
exec: &fakeexec.FakeExec{},
serviceMap: make(proxy.ServiceMap),
serviceChanges: proxy.NewServiceChangeTracker(newServiceInfo, ipfamily, nil, nil),
endpointsMap: make(proxy.EndpointsMap),
endpointsChanges: proxy.NewEndpointChangeTracker(testHostname, newEndpointInfo, ipfamily, nil, nil),
iptables: ipt,
masqueradeMark: "0x4000",
localDetector: detectLocal,
hostname: testHostname,
portsMap: make(map[utilnet.LocalPort]utilnet.Closeable),
portMapper: &fakePortOpener{[]*utilnet.LocalPort{}},
serviceHealthServer: healthcheck.NewFakeServiceHealthServer(),
precomputedProbabilities: make([]string, 0, 1001),
iptablesData: bytes.NewBuffer(nil),
existingFilterChainsData: bytes.NewBuffer(nil),
filterChains: bytes.NewBuffer(nil),
filterRules: bytes.NewBuffer(nil),
natChains: bytes.NewBuffer(nil),
natRules: bytes.NewBuffer(nil),
nodePortAddresses: make([]string, 0),
networkInterfacer: utilproxytest.NewFakeNetwork(),
}
p.setInitialized(true)
p.syncRunner = async.NewBoundedFrequencyRunner("test-sync-runner", p.syncProxyRules, 0, time.Minute, 1)
return p
}
func hasSessionAffinityRule(rules []iptablestest.Rule) bool {
for _, r := range rules {
if _, ok := r[iptablestest.Recent]; ok {
return true
}
}
return false
}
func hasJump(rules []iptablestest.Rule, destChain, destIP string, destPort int) bool {
destPortStr := strconv.Itoa(destPort)
match := false
for _, r := range rules {
if r[iptablestest.Jump] == destChain {
match = true
if destIP != "" {
if strings.Contains(r[iptablestest.Destination], destIP) && (strings.Contains(r[iptablestest.DPort], destPortStr) || r[iptablestest.DPort] == "") {
return true
}
match = false
}
if destPort != 0 {
if strings.Contains(r[iptablestest.DPort], destPortStr) && (strings.Contains(r[iptablestest.Destination], destIP) || r[iptablestest.Destination] == "") {
return true
}
match = false
}
}
}
return match
}
func hasSrcType(rules []iptablestest.Rule, srcType string) bool {
for _, r := range rules {
if r[iptablestest.SrcType] != srcType {
continue
}
return true
}
return false
}
func hasMasqRandomFully(rules []iptablestest.Rule) bool {
for _, r := range rules {
if r[iptablestest.Masquerade] == "--random-fully" {
return true
}
}
return false
}
func TestHasJump(t *testing.T) {
testCases := map[string]struct {
rules []iptablestest.Rule
destChain string
destIP string
destPort int
expected bool
}{
"case 1": {
// Match the 1st rule(both dest IP and dest Port)
rules: []iptablestest.Rule{
{"-d ": "10.20.30.41/32", "--dport ": "80", "-p ": "tcp", "-j ": "REJECT"},
{"--dport ": "3001", "-p ": "tcp", "-j ": "KUBE-MARK-MASQ"},
},
destChain: "REJECT",
destIP: "10.20.30.41",
destPort: 80,
expected: true,
},
"case 2": {
// Match the 2nd rule(dest Port)
rules: []iptablestest.Rule{
{"-d ": "10.20.30.41/32", "-p ": "tcp", "-j ": "REJECT"},
{"--dport ": "3001", "-p ": "tcp", "-j ": "REJECT"},
},
destChain: "REJECT",
destIP: "",
destPort: 3001,
expected: true,
},
"case 3": {
// Match both dest IP and dest Port
rules: []iptablestest.Rule{
{"-d ": "1.2.3.4/32", "--dport ": "80", "-p ": "tcp", "-j ": "KUBE-XLB-GF53O3C2HZEXL2XN"},
},
destChain: "KUBE-XLB-GF53O3C2HZEXL2XN",
destIP: "1.2.3.4",
destPort: 80,
expected: true,
},
"case 4": {
// Match dest IP but doesn't match dest Port
rules: []iptablestest.Rule{
{"-d ": "1.2.3.4/32", "--dport ": "80", "-p ": "tcp", "-j ": "KUBE-XLB-GF53O3C2HZEXL2XN"},
},
destChain: "KUBE-XLB-GF53O3C2HZEXL2XN",
destIP: "1.2.3.4",
destPort: 8080,
expected: false,
},
"case 5": {
// Match dest Port but doesn't match dest IP
rules: []iptablestest.Rule{
{"-d ": "1.2.3.4/32", "--dport ": "80", "-p ": "tcp", "-j ": "KUBE-XLB-GF53O3C2HZEXL2XN"},
},
destChain: "KUBE-XLB-GF53O3C2HZEXL2XN",
destIP: "10.20.30.40",
destPort: 80,
expected: false,
},
"case 6": {
// Match the 2nd rule(dest IP)
rules: []iptablestest.Rule{
{"-d ": "10.20.30.41/32", "-p ": "tcp", "-j ": "REJECT"},
{"-d ": "1.2.3.4/32", "-p ": "tcp", "-j ": "REJECT"},
{"--dport ": "3001", "-p ": "tcp", "-j ": "REJECT"},
},
destChain: "REJECT",
destIP: "1.2.3.4",
destPort: 8080,
expected: true,
},
"case 7": {
// Match the 2nd rule(dest Port)
rules: []iptablestest.Rule{
{"-d ": "10.20.30.41/32", "-p ": "tcp", "-j ": "REJECT"},
{"--dport ": "3001", "-p ": "tcp", "-j ": "REJECT"},
},
destChain: "REJECT",
destIP: "1.2.3.4",
destPort: 3001,
expected: true,
},
"case 8": {
// Match the 1st rule(dest IP)
rules: []iptablestest.Rule{
{"-d ": "10.20.30.41/32", "-p ": "tcp", "-j ": "REJECT"},
{"--dport ": "3001", "-p ": "tcp", "-j ": "REJECT"},
},
destChain: "REJECT",
destIP: "10.20.30.41",
destPort: 8080,
expected: true,
},
"case 9": {
rules: []iptablestest.Rule{
{"-j ": "KUBE-SEP-LWSOSDSHMKPJHHJV"},
},
destChain: "KUBE-SEP-LWSOSDSHMKPJHHJV",
destIP: "",
destPort: 0,
expected: true,
},
"case 10": {
rules: []iptablestest.Rule{
{"-j ": "KUBE-SEP-FOO"},
},
destChain: "KUBE-SEP-BAR",
destIP: "",
destPort: 0,
expected: false,
},
}
for k, tc := range testCases {
if got := hasJump(tc.rules, tc.destChain, tc.destIP, tc.destPort); got != tc.expected {
t.Errorf("%v: expected %v, got %v", k, tc.expected, got)
}
}
}
func hasDNAT(rules []iptablestest.Rule, endpoint string) bool {
for _, r := range rules {
if r[iptablestest.ToDest] == endpoint {
return true
}
}
return false
}
func errorf(msg string, rules []iptablestest.Rule, t *testing.T) {
for _, r := range rules {
t.Logf("%q", r)
}
t.Errorf("%v", msg)
}
// TestOverallIPTablesRulesWithMultipleServices creates 4 types of services: ClusterIP,
// LoadBalancer, ExternalIP and NodePort and verifies if the NAT table rules created
// are exactly the same as what is expected. This test provides an overall view of how
// the NAT table rules look like with the different jumps.
func TestOverallIPTablesRulesWithMultipleServices(t *testing.T) {
ipt := iptablestest.NewFake()
fp := NewFakeProxier(ipt)
metrics.RegisterMetrics()
tcpProtocol := v1.ProtocolTCP
makeServiceMap(fp,
// create ClusterIP service
makeTestService("ns1", "svc1", func(svc *v1.Service) {
svc.Spec.ClusterIP = "10.20.30.41"
svc.Spec.Ports = []v1.ServicePort{{
Name: "p80",
Port: 80,
Protocol: v1.ProtocolTCP,
}}
}),
// create LoadBalancer service
makeTestService("ns2", "svc2", func(svc *v1.Service) {
svc.Spec.Type = "LoadBalancer"
svc.Spec.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyTypeLocal
svc.Spec.ClusterIP = "10.20.30.42"
svc.Spec.Ports = []v1.ServicePort{{
Name: "p80",
Port: 80,
Protocol: v1.ProtocolTCP,
NodePort: 3001,
}}
svc.Status.LoadBalancer.Ingress = []v1.LoadBalancerIngress{{
IP: "1.2.3.4",
}}
// Also ensure that invalid LoadBalancerSourceRanges will not result
// in a crash.
svc.Spec.ExternalIPs = []string{"1.2.3.4"}
svc.Spec.LoadBalancerSourceRanges = []string{" 1.2.3.4/28"}
svc.Spec.HealthCheckNodePort = 30000
}),
// create NodePort service
makeTestService("ns3", "svc3", func(svc *v1.Service) {
svc.Spec.Type = "NodePort"
svc.Spec.ClusterIP = "10.20.30.43"
svc.Spec.Ports = []v1.ServicePort{{
Name: "p80",
Port: 80,
Protocol: v1.ProtocolTCP,
NodePort: 3001,
}}
}),
// create ExternalIP service
makeTestService("ns4", "svc4", func(svc *v1.Service) {
svc.Spec.Type = "NodePort"
svc.Spec.ClusterIP = "10.20.30.44"
svc.Spec.ExternalIPs = []string{"50.60.70.81"}
svc.Spec.Ports = []v1.ServicePort{{
Name: "p80",
Port: 80,
Protocol: v1.ProtocolTCP,
TargetPort: intstr.FromInt(80),
}}
}),
)
populateEndpointSlices(fp,
// create ClusterIP service endpoints
makeTestEndpointSlice("ns1", "svc1", 1, func(eps *discovery.EndpointSlice) {
eps.AddressType = discovery.AddressTypeIPv4
eps.Endpoints = []discovery.Endpoint{{
Addresses: []string{"10.180.0.1"},
}}
eps.Ports = []discovery.EndpointPort{{
Name: utilpointer.StringPtr("p80"),
Port: utilpointer.Int32(80),
Protocol: &tcpProtocol,
}}
}),
// create LoadBalancer endpoints
makeTestEndpointSlice("ns2", "svc2", 1, func(eps *discovery.EndpointSlice) {
eps.AddressType = discovery.AddressTypeIPv4
eps.Endpoints = []discovery.Endpoint{{
Addresses: []string{"10.180.0.2"},
}}
eps.Ports = []discovery.EndpointPort{{
Name: utilpointer.StringPtr("p80"),
Port: utilpointer.Int32(80),
Protocol: &tcpProtocol,
}}
}),
// create NodePort service endpoints
makeTestEndpointSlice("ns3", "svc3", 1, func(eps *discovery.EndpointSlice) {
eps.AddressType = discovery.AddressTypeIPv4
eps.Endpoints = []discovery.Endpoint{{
Addresses: []string{"10.180.0.3"},
}}
eps.Ports = []discovery.EndpointPort{{
Name: utilpointer.StringPtr("p80"),
Port: utilpointer.Int32(80),
Protocol: &tcpProtocol,
}}
}),
// create ExternalIP service endpoints
makeTestEndpointSlice("ns4", "svc4", 1, func(eps *discovery.EndpointSlice) {
eps.AddressType = discovery.AddressTypeIPv4
eps.Endpoints = []discovery.Endpoint{{
Addresses: []string{"10.180.0.4"},
}, {
Addresses: []string{"10.180.0.5"},
NodeName: utilpointer.StringPtr(testHostname),
}}
eps.Ports = []discovery.EndpointPort{{
Name: utilpointer.StringPtr("p80"),
Port: utilpointer.Int32(80),
Protocol: &tcpProtocol,
}}
}),
)
fp.syncProxyRules()
expected := `*filter
:KUBE-SERVICES - [0:0]
:KUBE-EXTERNAL-SERVICES - [0:0]
:KUBE-FORWARD - [0:0]
:KUBE-NODEPORTS - [0:0]
-A KUBE-NODEPORTS -m comment --comment "ns2/svc2:p80 health check node port" -m tcp -p tcp --dport 30000 -j ACCEPT
-A KUBE-FORWARD -m conntrack --ctstate INVALID -j DROP
-A KUBE-FORWARD -m comment --comment "kubernetes forwarding rules" -m mark --mark 0x4000/0x4000 -j ACCEPT
-A KUBE-FORWARD -m comment --comment "kubernetes forwarding conntrack pod source rule" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A KUBE-FORWARD -m comment --comment "kubernetes forwarding conntrack pod destination rule" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
COMMIT
*nat
:KUBE-SERVICES - [0:0]
:KUBE-NODEPORTS - [0:0]
:KUBE-POSTROUTING - [0:0]
:KUBE-MARK-MASQ - [0:0]
:KUBE-SVC-XPGD46QRK7WJZT7O - [0:0]
:KUBE-SEP-SXIVWICOYRO3J4NJ - [0:0]
:KUBE-SVC-GNZBNJ2PO5MGZ6GT - [0:0]
:KUBE-XLB-GNZBNJ2PO5MGZ6GT - [0:0]
:KUBE-FW-GNZBNJ2PO5MGZ6GT - [0:0]
:KUBE-SEP-RS4RBKLTHTF2IUXJ - [0:0]
:KUBE-SVC-X27LE4BHSL4DOUIK - [0:0]
:KUBE-SEP-OYPFS5VJICHGATKP - [0:0]
:KUBE-SVC-4SW47YFZTEDKD3PK - [0:0]
:KUBE-SEP-UKSFD7AGPMPPLUHC - [0:0]
:KUBE-SEP-C6EBXVWJJZMIWKLZ - [0:0]
-A KUBE-POSTROUTING -m mark ! --mark 0x4000/0x4000 -j RETURN
-A KUBE-POSTROUTING -j MARK --xor-mark 0x4000
-A KUBE-POSTROUTING -m comment --comment "kubernetes service traffic requiring SNAT" -j MASQUERADE
-A KUBE-MARK-MASQ -j MARK --or-mark 0x4000
-A KUBE-SERVICES -m comment --comment "ns1/svc1:p80 cluster IP" -m tcp -p tcp -d 10.20.30.41/32 --dport 80 -j KUBE-SVC-XPGD46QRK7WJZT7O
-A KUBE-SVC-XPGD46QRK7WJZT7O -m comment --comment "ns1/svc1:p80 cluster IP" -m tcp -p tcp -d 10.20.30.41/32 --dport 80 ! -s 10.0.0.0/24 -j KUBE-MARK-MASQ
-A KUBE-SVC-XPGD46QRK7WJZT7O -m comment --comment ns1/svc1:p80 -j KUBE-SEP-SXIVWICOYRO3J4NJ
-A KUBE-SEP-SXIVWICOYRO3J4NJ -m comment --comment ns1/svc1:p80 -s 10.180.0.1/32 -j KUBE-MARK-MASQ
-A KUBE-SEP-SXIVWICOYRO3J4NJ -m comment --comment ns1/svc1:p80 -m tcp -p tcp -j DNAT --to-destination 10.180.0.1:80
-A KUBE-SERVICES -m comment --comment "ns2/svc2:p80 cluster IP" -m tcp -p tcp -d 10.20.30.42/32 --dport 80 -j KUBE-SVC-GNZBNJ2PO5MGZ6GT
-A KUBE-SERVICES -m comment --comment "ns2/svc2:p80 external IP" -m tcp -p tcp -d 1.2.3.4/32 --dport 80 -j KUBE-XLB-GNZBNJ2PO5MGZ6GT
-A KUBE-SERVICES -m comment --comment "ns2/svc2:p80 loadbalancer IP" -m tcp -p tcp -d 1.2.3.4/32 --dport 80 -j KUBE-FW-GNZBNJ2PO5MGZ6GT
-A KUBE-SVC-GNZBNJ2PO5MGZ6GT -m comment --comment "ns2/svc2:p80 cluster IP" -m tcp -p tcp -d 10.20.30.42/32 --dport 80 ! -s 10.0.0.0/24 -j KUBE-MARK-MASQ
-A KUBE-SVC-GNZBNJ2PO5MGZ6GT -m comment --comment ns2/svc2:p80 -j KUBE-SEP-RS4RBKLTHTF2IUXJ
-A KUBE-SEP-RS4RBKLTHTF2IUXJ -m comment --comment ns2/svc2:p80 -s 10.180.0.2/32 -j KUBE-MARK-MASQ
-A KUBE-SEP-RS4RBKLTHTF2IUXJ -m comment --comment ns2/svc2:p80 -m tcp -p tcp -j DNAT --to-destination 10.180.0.2:80
-A KUBE-FW-GNZBNJ2PO5MGZ6GT -m comment --comment "ns2/svc2:p80 loadbalancer IP" -s 1.2.3.4/28 -j KUBE-XLB-GNZBNJ2PO5MGZ6GT
-A KUBE-FW-GNZBNJ2PO5MGZ6GT -m comment --comment "ns2/svc2:p80 loadbalancer IP" -j KUBE-MARK-DROP
-A KUBE-NODEPORTS -m comment --comment ns2/svc2:p80 -m tcp -p tcp --dport 3001 -j KUBE-XLB-GNZBNJ2PO5MGZ6GT
-A KUBE-NODEPORTS -m comment --comment ns2/svc2:p80 -m tcp -p tcp --dport 3001 -s 127.0.0.0/8 -j KUBE-MARK-MASQ
-A KUBE-XLB-GNZBNJ2PO5MGZ6GT -m comment --comment "Redirect pods trying to reach external loadbalancer VIP to clusterIP" -s 10.0.0.0/24 -j KUBE-SVC-GNZBNJ2PO5MGZ6GT
-A KUBE-XLB-GNZBNJ2PO5MGZ6GT -m comment --comment "masquerade LOCAL traffic for ns2/svc2:p80 LB IP" -m addrtype --src-type LOCAL -j KUBE-MARK-MASQ
-A KUBE-XLB-GNZBNJ2PO5MGZ6GT -m comment --comment "route LOCAL traffic for ns2/svc2:p80 LB IP to service chain" -m addrtype --src-type LOCAL -j KUBE-SVC-GNZBNJ2PO5MGZ6GT
-A KUBE-XLB-GNZBNJ2PO5MGZ6GT -m comment --comment "ns2/svc2:p80 has no local endpoints" -j KUBE-MARK-DROP
-A KUBE-SERVICES -m comment --comment "ns3/svc3:p80 cluster IP" -m tcp -p tcp -d 10.20.30.43/32 --dport 80 -j KUBE-SVC-X27LE4BHSL4DOUIK
-A KUBE-SVC-X27LE4BHSL4DOUIK -m comment --comment "ns3/svc3:p80 cluster IP" -m tcp -p tcp -d 10.20.30.43/32 --dport 80 ! -s 10.0.0.0/24 -j KUBE-MARK-MASQ
-A KUBE-NODEPORTS -m comment --comment ns3/svc3:p80 -m tcp -p tcp --dport 3001 -j KUBE-SVC-X27LE4BHSL4DOUIK
-A KUBE-SVC-X27LE4BHSL4DOUIK -m comment --comment ns3/svc3:p80 -m tcp -p tcp --dport 3001 -j KUBE-MARK-MASQ
-A KUBE-SVC-X27LE4BHSL4DOUIK -m comment --comment ns3/svc3:p80 -j KUBE-SEP-OYPFS5VJICHGATKP
-A KUBE-SEP-OYPFS5VJICHGATKP -m comment --comment ns3/svc3:p80 -s 10.180.0.3/32 -j KUBE-MARK-MASQ
-A KUBE-SEP-OYPFS5VJICHGATKP -m comment --comment ns3/svc3:p80 -m tcp -p tcp -j DNAT --to-destination 10.180.0.3:80
-A KUBE-SERVICES -m comment --comment "ns4/svc4:p80 cluster IP" -m tcp -p tcp -d 10.20.30.44/32 --dport 80 -j KUBE-SVC-4SW47YFZTEDKD3PK
-A KUBE-SERVICES -m comment --comment "ns4/svc4:p80 external IP" -m tcp -p tcp -d 50.60.70.81/32 --dport 80 -j KUBE-SVC-4SW47YFZTEDKD3PK
-A KUBE-SVC-4SW47YFZTEDKD3PK -m comment --comment "ns4/svc4:p80 cluster IP" -m tcp -p tcp -d 10.20.30.44/32 --dport 80 ! -s 10.0.0.0/24 -j KUBE-MARK-MASQ
-A KUBE-SVC-4SW47YFZTEDKD3PK -m comment --comment "ns4/svc4:p80 external IP" -m tcp -p tcp -d 50.60.70.81/32 --dport 80 ! -s 10.0.0.0/24 -j KUBE-MARK-MASQ
-A KUBE-SVC-4SW47YFZTEDKD3PK -m comment --comment ns4/svc4:p80 -m statistic --mode random --probability 0.5000000000 -j KUBE-SEP-UKSFD7AGPMPPLUHC
-A KUBE-SVC-4SW47YFZTEDKD3PK -m comment --comment ns4/svc4:p80 -j KUBE-SEP-C6EBXVWJJZMIWKLZ
-A KUBE-SEP-UKSFD7AGPMPPLUHC -m comment --comment ns4/svc4:p80 -s 10.180.0.4/32 -j KUBE-MARK-MASQ
-A KUBE-SEP-UKSFD7AGPMPPLUHC -m comment --comment ns4/svc4:p80 -m tcp -p tcp -j DNAT --to-destination 10.180.0.4:80
-A KUBE-SEP-C6EBXVWJJZMIWKLZ -m comment --comment ns4/svc4:p80 -s 10.180.0.5/32 -j KUBE-MARK-MASQ
-A KUBE-SEP-C6EBXVWJJZMIWKLZ -m comment --comment ns4/svc4:p80 -m tcp -p tcp -j DNAT --to-destination 10.180.0.5:80
-A KUBE-SERVICES -m comment --comment "kubernetes service nodeports; NOTE: this must be the last rule in this chain" -m addrtype --dst-type LOCAL -j KUBE-NODEPORTS
COMMIT
`
// Adding logic to split and sort the strings because
// depending on the creation order of services, the user-chains get jumbled.
expectedSlice := strings.Split(strings.TrimSuffix(expected, "\n"), "\n")
sort.Strings(expectedSlice)
originalSlice := strings.Split(strings.TrimSuffix(fp.iptablesData.String(), "\n"), "\n")
sort.Strings(originalSlice)
assert.Equal(t, expectedSlice, originalSlice)
nNatRules, err := testutil.GetGaugeMetricValue(metrics.IptablesRulesTotal.WithLabelValues(string(utiliptables.TableNAT)))
if err != nil {
t.Errorf("failed to get %s value, err: %v", metrics.IptablesRulesTotal.Name, err)
}
// 43 here is test specific and corresponds to one more than the number of -A lines after `*nat` in `expected`.
if nNatRules != 43.0 {
t.Fatalf("Wrong number of nat rules: expected 43 received %f", nNatRules)
}
}
func TestClusterIPReject(t *testing.T) {
ipt := iptablestest.NewFake()
fp := NewFakeProxier(ipt)
svcIP := "10.20.30.41"
svcPort := 80
svcPortName := proxy.ServicePortName{
NamespacedName: makeNSN("ns1", "svc1"),
Port: "p80",
}
makeServiceMap(fp,
makeTestService(svcPortName.Namespace, svcPortName.Name, func(svc *v1.Service) {
svc.Spec.ClusterIP = svcIP
svc.Spec.Ports = []v1.ServicePort{{
Name: svcPortName.Port,
Port: int32(svcPort),
Protocol: v1.ProtocolTCP,
}}
}),
)
fp.syncProxyRules()
svcChain := string(servicePortChainName(svcPortName.String(), strings.ToLower(string(v1.ProtocolTCP))))
svcRules := ipt.GetRules(svcChain)
if len(svcRules) != 0 {
errorf(fmt.Sprintf("Unexpected rule for chain %v service %v without endpoints", svcChain, svcPortName), svcRules, t)
}
kubeSvcRules := ipt.GetRules(string(kubeServicesChain))
if !hasJump(kubeSvcRules, iptablestest.Reject, svcIP, svcPort) {
errorf(fmt.Sprintf("Failed to find a %v rule for service %v with no endpoints", iptablestest.Reject, svcPortName), kubeSvcRules, t)
}
}
func TestClusterIPEndpointsJump(t *testing.T) {
ipt := iptablestest.NewFake()
fp := NewFakeProxier(ipt)
svcIP := "10.20.30.41"
svcPort := 80
svcPortName := proxy.ServicePortName{
NamespacedName: makeNSN("ns1", "svc1"),
Port: "p80",
Protocol: v1.ProtocolTCP,
}
makeServiceMap(fp,
makeTestService(svcPortName.Namespace, svcPortName.Name, func(svc *v1.Service) {
svc.Spec.ClusterIP = svcIP
svc.Spec.Ports = []v1.ServicePort{{
Name: svcPortName.Port,
Port: int32(svcPort),
Protocol: v1.ProtocolTCP,
}}
}),
)
epIP := "10.180.0.1"
tcpProtocol := v1.ProtocolTCP
populateEndpointSlices(fp,
makeTestEndpointSlice(svcPortName.Namespace, svcPortName.Name, 1, func(eps *discovery.EndpointSlice) {
eps.AddressType = discovery.AddressTypeIPv4
eps.Endpoints = []discovery.Endpoint{{
Addresses: []string{epIP},
}}
eps.Ports = []discovery.EndpointPort{{
Name: utilpointer.StringPtr(svcPortName.Port),
Port: utilpointer.Int32(int32(svcPort)),
Protocol: &tcpProtocol,
}}
}),
)
fp.syncProxyRules()
epStr := fmt.Sprintf("%s:%d", epIP, svcPort)
svcChain := string(servicePortChainName(svcPortName.String(), strings.ToLower(string(v1.ProtocolTCP))))
epChain := string(servicePortEndpointChainName(svcPortName.String(), strings.ToLower(string(v1.ProtocolTCP)), epStr))
kubeSvcRules := ipt.GetRules(string(kubeServicesChain))
if !hasJump(kubeSvcRules, svcChain, svcIP, svcPort) {