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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"
"regexp"
stdruntime "runtime"
"sort"
"strconv"
"strings"
"testing"
"time"
"github.com/google/go-cmp/cmp"
"github.com/lithammer/dedent"
"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"
"k8s.io/apimachinery/pkg/util/sets"
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"
netutils "k8s.io/utils/net"
"k8s.io/utils/pointer"
)
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: "172.30.1.1",
svcPort: 80,
protocol: UDP,
endpoint: "10.240.0.3:80",
},
{
description: "V4 TCP",
svcName: "v4-tcp",
svcIP: "172.30.2.2",
svcPort: 80,
protocol: TCP,
endpoint: "10.240.0.4:80",
},
{
description: "V4 SCTP",
svcName: "v4-sctp",
svcIP: "172.30.3.3",
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: "172.30.1.1",
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: "172.30.1.1",
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.svcPortMap.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 := netutils.ParseIPSloppy(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.svcPortMap.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 := netutils.ParseIPSloppy(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)
}
}
}
// Conventions for tests using NewFakeProxier:
//
// Pod IPs: 10.0.0.0/8
// Service ClusterIPs: 172.30.0.0/16
// Node IPs: 192.168.0.0/24
// Local Node IP: 192.168.0.2
// Service ExternalIPs: 192.168.99.0/24
// LoadBalancer IPs: 1.2.3.4, 5.6.7.8, 9.10.11.12
// Non-cluster IPs: 203.0.113.0/24
// LB Source Range: 203.0.113.0/25
const testHostname = "test-hostname"
const testNodeIP = "192.168.0.2"
const testExternalClient = "203.0.113.2"
const testExternalClientBlocked = "203.0.113.130"
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("10.0.0.0/8", ipt)
networkInterfacer := utilproxytest.NewFakeNetwork()
itf := net.Interface{Index: 0, MTU: 0, Name: "lo", HardwareAddr: nil, Flags: 0}
addrs := []net.Addr{
&net.IPNet{IP: netutils.ParseIPSloppy("127.0.0.1"), Mask: net.CIDRMask(8, 32)},
&net.IPNet{IP: netutils.ParseIPSloppy("::1/128"), Mask: net.CIDRMask(128, 128)},
}
networkInterfacer.AddInterfaceAddr(&itf, addrs)
itf1 := net.Interface{Index: 1, MTU: 0, Name: "eth0", HardwareAddr: nil, Flags: 0}
addrs1 := []net.Addr{
&net.IPNet{IP: netutils.ParseIPSloppy(testNodeIP), Mask: net.CIDRMask(24, 32)},
}
networkInterfacer.AddInterfaceAddr(&itf1, addrs1)
p := &Proxier{
exec: &fakeexec.FakeExec{},
svcPortMap: make(proxy.ServicePortMap),
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,
serviceHealthServer: healthcheck.NewFakeServiceHealthServer(),
precomputedProbabilities: make([]string, 0, 1001),
iptablesData: bytes.NewBuffer(nil),
existingFilterChainsData: bytes.NewBuffer(nil),
filterChains: utilproxy.LineBuffer{},
filterRules: utilproxy.LineBuffer{},
natChains: utilproxy.LineBuffer{},
natRules: utilproxy.LineBuffer{},
nodeIP: netutils.ParseIPSloppy(testNodeIP),
localhostNodePorts: true,
nodePortAddresses: make([]string, 0),
networkInterfacer: networkInterfacer,
}
p.setInitialized(true)
p.syncRunner = async.NewBoundedFrequencyRunner("test-sync-runner", p.syncProxyRules, 0, time.Minute, 1)
return p
}
// parseIPTablesData takes iptables-save output and returns a map of table name to array of lines.
func parseIPTablesData(ruleData string) (map[string][]string, error) {
// Split ruleData at the "COMMIT" lines; given valid input, this will result in
// one element for each table plus an extra empty element (since the ruleData
// should end with a "COMMIT" line).
rawTables := strings.Split(strings.TrimPrefix(ruleData, "\n"), "COMMIT\n")
nTables := len(rawTables) - 1
if nTables < 2 || rawTables[nTables] != "" {
return nil, fmt.Errorf("bad ruleData (%d tables)\n%s", nTables, ruleData)
}
tables := make(map[string][]string, nTables)
for i, table := range rawTables[:nTables] {
lines := strings.Split(strings.Trim(table, "\n"), "\n")
// The first line should be, eg, "*nat" or "*filter"
if lines[0][0] != '*' {
return nil, fmt.Errorf("bad ruleData (table %d starts with %q)", i+1, lines[0])
}
// add back the "COMMIT" line that got eaten by the strings.Split above
lines = append(lines, "COMMIT")
tables[lines[0][1:]] = lines
}
if tables["nat"] == nil {
return nil, fmt.Errorf("bad ruleData (no %q table)", "nat")
}
if tables["filter"] == nil {
return nil, fmt.Errorf("bad ruleData (no %q table)", "filter")
}
return tables, nil
}
func TestParseIPTablesData(t *testing.T) {
for _, tc := range []struct {
name string
input string
output map[string][]string
error string
}{
{
name: "basic test",
input: dedent.Dedent(`
*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 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]
-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 --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 --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 -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 "kubernetes service nodeports; NOTE: this must be the last rule in this chain" -m addrtype --dst-type LOCAL -j KUBE-NODEPORTS
COMMIT
`),
output: map[string][]string{
"filter": {
`*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 rule" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT`,
`COMMIT`,
},
"nat": {
`*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]`,
`-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 --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 --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 -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 "kubernetes service nodeports; NOTE: this must be the last rule in this chain" -m addrtype --dst-type LOCAL -j KUBE-NODEPORTS`,
`COMMIT`,
},
},
},
{
name: "not enough tables",
input: dedent.Dedent(`
*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 rule" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
COMMIT
`),
error: "bad ruleData (1 tables)",
},
{
name: "trailing junk",
input: dedent.Dedent(`
*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 rule" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
COMMIT
*nat
: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 rule" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
COMMIT
junk
`),
error: "bad ruleData (2 tables)",
},
{
name: "bad start line",
input: dedent.Dedent(`
*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 rule" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
COMMIT
: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 rule" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
COMMIT
`),
error: `bad ruleData (table 2 starts with ":KUBE-SERVICES - [0:0]")`,
},
{
name: "no nat",
input: dedent.Dedent(`
*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 rule" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
COMMIT
*mangle
: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 rule" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
COMMIT
`),
error: `bad ruleData (no "nat" table)`,
},
{
name: "no filter",
input: dedent.Dedent(`
*mangle
: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 rule" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
COMMIT
*nat
: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 rule" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
COMMIT
`),
error: `bad ruleData (no "filter" table)`,
},
} {
t.Run(tc.name, func(t *testing.T) {
out, err := parseIPTablesData(tc.input)
if err == nil {
if tc.error != "" {
t.Errorf("unexpectedly did not get error")
} else {
assert.Equal(t, tc.output, out)
}
} else {
if tc.error == "" {
t.Errorf("got unexpected error: %v", err)
} else if !strings.HasPrefix(err.Error(), tc.error) {
t.Errorf("got wrong error: %v (expected %q)", err, tc.error)
}
}
})
}
}
func countRules(tableName utiliptables.Table, ruleData string) int {
dump, err := iptablestest.ParseIPTablesDump(ruleData)
if err != nil {
klog.ErrorS(err, "error parsing iptables rules")
return -1
}
rules := 0
table, err := dump.GetTable(tableName)
if err != nil {
klog.ErrorS(err, "can't find table", "table", tableName)
return -1
}
for _, c := range table.Chains {
rules += len(c.Rules)
}
return rules
}
// findAllMatches takes an array of lines and a pattern with one parenthesized group, and
// returns a sorted array of all of the unique matches of the parenthesized group.
func findAllMatches(lines []string, pattern string) []string {
regex := regexp.MustCompile(pattern)
allMatches := sets.NewString()
for _, line := range lines {
match := regex.FindStringSubmatch(line)
if len(match) == 2 {
allMatches.Insert(match[1])
}
}
return allMatches.List()
}
// checkIPTablesRuleJumps checks that every `-j` in the given rules jumps to a chain
// that we created and added rules to
func checkIPTablesRuleJumps(ruleData string) error {
tables, err := parseIPTablesData(ruleData)
if err != nil {
return err
}
for tableName, lines := range tables {
// Find all of the lines like ":KUBE-SERVICES", indicating chains that
// iptables-restore would create when loading the data.
createdChains := sets.NewString(findAllMatches(lines, `^:([^ ]*)`)...)
// Find all of the lines like "-X KUBE-SERVICES ..." indicating chains
// that we are deleting because they are no longer used, and remove
// those chains from createdChains.
createdChains = createdChains.Delete(findAllMatches(lines, `-X ([^ ]*)`)...)
// Find all of the lines like "-A KUBE-SERVICES ..." indicating chains
// that we are adding at least one rule to.
filledChains := sets.NewString(findAllMatches(lines, `-A ([^ ]*)`)...)
// Find all of the chains that are jumped to by some rule so we can make
// sure we only jump to valid chains.
jumpedChains := sets.NewString(findAllMatches(lines, `-j ([^ ]*)`)...)
// Ignore jumps to chains that we expect to exist even if kube-proxy
// didn't create them itself.
jumpedChains.Delete("ACCEPT", "REJECT", "DROP", "MARK", "RETURN", "DNAT", "SNAT", "MASQUERADE")
// Find cases where we have "-A FOO ... -j BAR" but no ":BAR", meaning
// that we are jumping to a chain that was not created.
missingChains := jumpedChains.Difference(createdChains)
missingChains = missingChains.Union(filledChains.Difference(createdChains))
if len(missingChains) > 0 {
return fmt.Errorf("some chains in %s are used but were not created: %v", tableName, missingChains.List())
}
// Find cases where we have "-A FOO ... -j BAR", but no "-A BAR ...",
// meaning that we are jumping to a chain that we didn't write out any
// rules for, which is normally a bug. (Except that KUBE-SERVICES always
// jumps to KUBE-NODEPORTS, even when there are no NodePort rules.)
emptyChains := jumpedChains.Difference(filledChains)
emptyChains.Delete(string(kubeNodePortsChain))
if len(emptyChains) > 0 {
return fmt.Errorf("some chains in %s are jumped to but have no rules: %v", tableName, emptyChains.List())
}
// Find cases where we have ":BAR" but no "-A FOO ... -j BAR", meaning
// that we are creating an empty chain but not using it for anything.
extraChains := createdChains.Difference(jumpedChains)
extraChains.Delete(string(kubeServicesChain), string(kubeExternalServicesChain), string(kubeNodePortsChain), string(kubePostroutingChain), string(kubeForwardChain), string(kubeMarkMasqChain), string(kubeProxyFirewallChain))
if len(extraChains) > 0 {
return fmt.Errorf("some chains in %s are created but not used: %v", tableName, extraChains.List())
}
}
return nil
}
func TestCheckIPTablesRuleJumps(t *testing.T) {
for _, tc := range []struct {
name string
input string
error string
}{
{
name: "valid",
input: dedent.Dedent(`
*filter
COMMIT
*nat
:KUBE-MARK-MASQ - [0:0]
:KUBE-SERVICES - [0:0]
:KUBE-SVC-XPGD46QRK7WJZT7O - [0:0]
-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 --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 --dport 80 ! -s 10.0.0.0/24 -j KUBE-MARK-MASQ
COMMIT
`),
error: "",
},
{
name: "can't jump to chain that wasn't created",
input: dedent.Dedent(`
*filter
COMMIT
*nat
:KUBE-SERVICES - [0:0]
-A KUBE-SERVICES -m comment --comment "ns1/svc1:p80 cluster IP" -m tcp -p tcp -d 172.30.0.41 --dport 80 -j KUBE-SVC-XPGD46QRK7WJZT7O
COMMIT
`),
error: "some chains in nat are used but were not created: [KUBE-SVC-XPGD46QRK7WJZT7O]",
},
{
name: "can't jump to chain that has no rules",
input: dedent.Dedent(`
*filter
COMMIT
*nat
:KUBE-SERVICES - [0:0]
:KUBE-SVC-XPGD46QRK7WJZT7O - [0:0]
-A KUBE-SERVICES -m comment --comment "ns1/svc1:p80 cluster IP" -m tcp -p tcp -d 172.30.0.41 --dport 80 -j KUBE-SVC-XPGD46QRK7WJZT7O
COMMIT
`),
error: "some chains in nat are jumped to but have no rules: [KUBE-SVC-XPGD46QRK7WJZT7O]",
},
{
name: "can't add rules to a chain that wasn't created",
input: dedent.Dedent(`
*filter
COMMIT
*nat
:KUBE-MARK-MASQ - [0:0]
:KUBE-SERVICES - [0:0]
-A KUBE-SERVICES -m comment --comment "ns1/svc1:p80 cluster IP" ...
-A KUBE-SVC-XPGD46QRK7WJZT7O -m comment --comment "ns1/svc1:p80 cluster IP" -m tcp -p tcp -d 172.30.0.41 --dport 80 ! -s 10.0.0.0/8 -j KUBE-MARK-MASQ
COMMIT
`),
error: "some chains in nat are used but were not created: [KUBE-SVC-XPGD46QRK7WJZT7O]",
},
{
name: "can't jump to chain that wasn't created",
input: dedent.Dedent(`
*filter
COMMIT
*nat
:KUBE-SERVICES - [0:0]
-A KUBE-SERVICES -m comment --comment "ns1/svc1:p80 cluster IP" -m tcp -p tcp -d 172.30.0.41 --dport 80 -j KUBE-SVC-XPGD46QRK7WJZT7O
COMMIT
`),
error: "some chains in nat are used but were not created: [KUBE-SVC-XPGD46QRK7WJZT7O]",
},
{
name: "can't jump to chain that has no rules",
input: dedent.Dedent(`
*filter
COMMIT
*nat
:KUBE-SERVICES - [0:0]
:KUBE-SVC-XPGD46QRK7WJZT7O - [0:0]
-A KUBE-SERVICES -m comment --comment "ns1/svc1:p80 cluster IP" -m tcp -p tcp -d 172.30.0.41 --dport 80 -j KUBE-SVC-XPGD46QRK7WJZT7O
COMMIT
`),
error: "some chains in nat are jumped to but have no rules: [KUBE-SVC-XPGD46QRK7WJZT7O]",
},
{
name: "can't add rules to a chain that wasn't created",
input: dedent.Dedent(`
*filter
COMMIT
*nat
:KUBE-MARK-MASQ - [0:0]
:KUBE-SERVICES - [0:0]
-A KUBE-SERVICES -m comment --comment "ns1/svc1:p80 cluster IP" ...
-A KUBE-SVC-XPGD46QRK7WJZT7O -m comment --comment "ns1/svc1:p80 cluster IP" -m tcp -p tcp -d 172.30.0.41 --dport 80 ! -s 10.0.0.0/8 -j KUBE-MARK-MASQ
COMMIT
`),
error: "some chains in nat are used but were not created: [KUBE-SVC-XPGD46QRK7WJZT7O]",
},
{
name: "can't create chain and then not use it",
input: dedent.Dedent(`
*filter
COMMIT
*nat
:KUBE-MARK-MASQ - [0:0]
:KUBE-SERVICES - [0:0]
:KUBE-SVC-XPGD46QRK7WJZT7O - [0:0]
-A KUBE-SERVICES -m comment --comment "ns1/svc1:p80 cluster IP" ...
COMMIT
`),
error: "some chains in nat are created but not used: [KUBE-SVC-XPGD46QRK7WJZT7O]",
},
} {
t.Run(tc.name, func(t *testing.T) {
err := checkIPTablesRuleJumps(tc.input)
if err == nil {
if tc.error != "" {
t.Errorf("unexpectedly did not get error")
}
} else {
if tc.error == "" {
t.Errorf("got unexpected error: %v", err)
} else if !strings.HasPrefix(err.Error(), tc.error) {
t.Errorf("got wrong error: %v (expected %q)", err, tc.error)
}
}
})
}
}
// orderByCommentServiceName is a helper function that orders two IPTables rules
// based on the service name in their comment. (If either rule has no comment then the
// return value is undefined.)
func orderByCommentServiceName(rule1, rule2 *iptablestest.Rule) bool {
if rule1.Comment == nil || rule2.Comment == nil {
return false
}
name1, name2 := rule1.Comment.Value, rule2.Comment.Value
// The service name is the comment up to the first space or colon
i := strings.IndexAny(name1, " :")
if i != -1 {
name1 = name1[:i]
}
i = strings.IndexAny(name2, " :")
if i != -1 {
name2 = name2[:i]
}
return name1 < name2
}
// sortIPTablesRules sorts `iptables-restore` output so as to not depend on the order that
// Services get processed in, while preserving the relative ordering of related rules.
func sortIPTablesRules(ruleData string) (string, error) {
dump, err := iptablestest.ParseIPTablesDump(ruleData)
if err != nil {
return "", err
}
// Sort tables
sort.Slice(dump.Tables, func(i, j int) bool {
return dump.Tables[i].Name < dump.Tables[j].Name
})
// Sort chains
for t := range dump.Tables {
table := &dump.Tables[t]
sort.Slice(table.Chains, func(i, j int) bool {
switch {
case table.Chains[i].Name == kubeNodePortsChain:
// KUBE-NODEPORTS comes before anything
return true
case table.Chains[j].Name == kubeNodePortsChain:
// anything goes after KUBE-NODEPORTS
return false
case table.Chains[i].Name == kubeServicesChain:
// KUBE-SERVICES comes before anything (except KUBE-NODEPORTS)
return true
case table.Chains[j].Name == kubeServicesChain:
// anything (except KUBE-NODEPORTS) goes after KUBE-SERVICES
return false
case strings.HasPrefix(string(table.Chains[i].Name), "KUBE-") && !strings.HasPrefix(string(table.Chains[j].Name), "KUBE-"):
// KUBE-* comes before non-KUBE-*
return true
case !strings.HasPrefix(string(table.Chains[i].Name), "KUBE-") && strings.HasPrefix(string(table.Chains[j].Name), "KUBE-"):
// non-KUBE-* goes after KUBE-*
return false
default:
// We have two KUBE-* chains or two non-KUBE-* chains; either
// way they sort alphabetically
return table.Chains[i].Name < table.Chains[j].Name
}
})
}
// Sort KUBE-NODEPORTS chains by service name
chain, _ := dump.GetChain(utiliptables.TableFilter, kubeNodePortsChain)
if chain != nil {
sort.SliceStable(chain.Rules, func(i, j int) bool {
return orderByCommentServiceName(chain.Rules[i], chain.Rules[j])
})
}
chain, _ = dump.GetChain(utiliptables.TableNAT, kubeNodePortsChain)
if chain != nil {
sort.SliceStable(chain.Rules, func(i, j int) bool {
return orderByCommentServiceName(chain.Rules[i], chain.Rules[j])
})
}
// Sort KUBE-SERVICES chains by service name (but keeping the "must be the last
// rule" rule in the "nat" table's KUBE-SERVICES chain last).
chain, _ = dump.GetChain(utiliptables.TableFilter, kubeServicesChain)
if chain != nil {
sort.SliceStable(chain.Rules, func(i, j int) bool {
return orderByCommentServiceName(chain.Rules[i], chain.Rules[j])
})
}
chain, _ = dump.GetChain(utiliptables.TableNAT, kubeServicesChain)
if chain != nil {
sort.SliceStable(chain.Rules, func(i, j int) bool {
if chain.Rules[i].Comment != nil && strings.Contains(chain.Rules[i].Comment.Value, "must be the last rule") {
return false
} else if chain.Rules[j].Comment != nil && strings.Contains(chain.Rules[j].Comment.Value, "must be the last rule") {
return true
}
return orderByCommentServiceName(chain.Rules[i], chain.Rules[j])
})