/*
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"
	"strconv"
	"strings"
	"testing"
	"time"

	"k8s.io/klog"

	"github.com/stretchr/testify/assert"
	v1 "k8s.io/api/core/v1"
	discovery "k8s.io/api/discovery/v1beta1"
	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/kubernetes/pkg/features"
	"k8s.io/kubernetes/pkg/proxy"
	"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"
	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 TestDeleteEndpointConnections(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",
		}, {
			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 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 tc.protocol == UDP {
			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, false)
	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
			}),
		)

		proxy.UpdateServiceMap(fp.serviceMap, 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 connections, check the executed conntrack command
		var expExecs int
		if tc.protocol == UDP {
			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 udp", tc.svcIP, endpointIP)
			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)
		}
	}
}

// fakePortOpener implements portOpener.
type fakePortOpener struct {
	openPorts []*utilproxy.LocalPort
}

// OpenLocalPort fakes out the listen() and bind() used by syncProxyRules
// to lock a local port.
func (f *fakePortOpener) OpenLocalPort(lp *utilproxy.LocalPort, isIPv6 bool) (utilproxy.Closeable, error) {
	f.openPorts = append(f.openPorts, lp)
	return nil, nil
}

const testHostname = "test-hostname"

func NewFakeProxier(ipt utiliptables.Interface, endpointSlicesEnabled bool) *Proxier {
	// TODO: Call NewProxier after refactoring out the goroutine
	// invocation into a Run() method.
	detectLocal, _ := proxyutiliptables.NewDetectLocalByCIDR("10.0.0.0/24", ipt)
	p := &Proxier{
		exec:                     &fakeexec.FakeExec{},
		serviceMap:               make(proxy.ServiceMap),
		serviceChanges:           proxy.NewServiceChangeTracker(newServiceInfo, nil, nil),
		endpointsMap:             make(proxy.EndpointsMap),
		endpointsChanges:         proxy.NewEndpointChangeTracker(testHostname, newEndpointInfo, nil, nil, endpointSlicesEnabled),
		iptables:                 ipt,
		masqueradeMark:           "0x4000",
		localDetector:            detectLocal,
		hostname:                 testHostname,
		portsMap:                 make(map[utilproxy.LocalPort]utilproxy.Closeable),
		portMapper:               &fakePortOpener{[]*utilproxy.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)
}

func TestClusterIPReject(t *testing.T) {
	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, false)
	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,
			}}
		}),
	)
	makeEndpointsMap(fp)
	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, false)
	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"
	makeEndpointsMap(fp,
		makeTestEndpoints(svcPortName.Namespace, svcPortName.Name, func(ept *v1.Endpoints) {
			ept.Subsets = []v1.EndpointSubset{{
				Addresses: []v1.EndpointAddress{{
					IP: epIP,
				}},
				Ports: []v1.EndpointPort{{
					Name:     svcPortName.Port,
					Port:     int32(svcPort),
					Protocol: v1.ProtocolTCP,
				}},
			}}
		}),
	)

	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) {
		errorf(fmt.Sprintf("Failed to find jump from KUBE-SERVICES to %v chain", svcChain), kubeSvcRules, t)
	}

	svcRules := ipt.GetRules(svcChain)
	if !hasJump(svcRules, epChain, "", 0) {
		errorf(fmt.Sprintf("Failed to jump to ep chain %v", epChain), svcRules, t)
	}
	epRules := ipt.GetRules(epChain)
	if !hasDNAT(epRules, epStr) {
		errorf(fmt.Sprintf("Endpoint chain %v lacks DNAT to %v", epChain, epStr), epRules, t)
	}
}

func TestLoadBalancer(t *testing.T) {
	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, false)
	svcIP := "10.20.30.41"
	svcPort := 80
	svcNodePort := 3001
	svcLBIP := "1.2.3.4"
	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.Type = "LoadBalancer"
			svc.Spec.ClusterIP = svcIP
			svc.Spec.Ports = []v1.ServicePort{{
				Name:     svcPortName.Port,
				Port:     int32(svcPort),
				Protocol: v1.ProtocolTCP,
				NodePort: int32(svcNodePort),
			}}
			svc.Status.LoadBalancer.Ingress = []v1.LoadBalancerIngress{{
				IP: svcLBIP,
			}}
		}),
	)

	epIP := "10.180.0.1"
	makeEndpointsMap(fp,
		makeTestEndpoints(svcPortName.Namespace, svcPortName.Name, func(ept *v1.Endpoints) {
			ept.Subsets = []v1.EndpointSubset{{
				Addresses: []v1.EndpointAddress{{
					IP: epIP,
				}},
				Ports: []v1.EndpointPort{{
					Name:     svcPortName.Port,
					Port:     int32(svcPort),
					Protocol: v1.ProtocolTCP,
				}},
			}}
		}),
	)

	fp.syncProxyRules()

	proto := strings.ToLower(string(v1.ProtocolTCP))
	fwChain := string(serviceFirewallChainName(svcPortName.String(), proto))
	svcChain := string(servicePortChainName(svcPortName.String(), proto))

	kubeSvcRules := ipt.GetRules(string(kubeServicesChain))
	if !hasJump(kubeSvcRules, fwChain, svcLBIP, svcPort) {
		errorf(fmt.Sprintf("Failed to find jump to firewall chain %v", fwChain), kubeSvcRules, t)
	}

	fwRules := ipt.GetRules(fwChain)
	if !hasJump(fwRules, svcChain, "", 0) || !hasJump(fwRules, string(KubeMarkMasqChain), "", 0) {
		errorf(fmt.Sprintf("Failed to find jump from firewall chain %v to svc chain %v", fwChain, svcChain), fwRules, t)
	}
}

func TestNodePort(t *testing.T) {
	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, false)
	svcIP := "10.20.30.41"
	svcPort := 80
	svcNodePort := 3001
	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.Type = "NodePort"
			svc.Spec.ClusterIP = svcIP
			svc.Spec.Ports = []v1.ServicePort{{
				Name:     svcPortName.Port,
				Port:     int32(svcPort),
				Protocol: v1.ProtocolTCP,
				NodePort: int32(svcNodePort),
			}}
		}),
	)

	epIP := "10.180.0.1"
	makeEndpointsMap(fp,
		makeTestEndpoints(svcPortName.Namespace, svcPortName.Name, func(ept *v1.Endpoints) {
			ept.Subsets = []v1.EndpointSubset{{
				Addresses: []v1.EndpointAddress{{
					IP: epIP,
				}},
				Ports: []v1.EndpointPort{{
					Name:     svcPortName.Port,
					Port:     int32(svcPort),
					Protocol: v1.ProtocolTCP,
				}},
			}}
		}),
	)

	itf := net.Interface{Index: 0, MTU: 0, Name: "lo", HardwareAddr: nil, Flags: 0}
	addrs := []net.Addr{utilproxytest.AddrStruct{Val: "127.0.0.1/16"}}
	itf1 := net.Interface{Index: 1, MTU: 0, Name: "eth1", HardwareAddr: nil, Flags: 0}
	addrs1 := []net.Addr{utilproxytest.AddrStruct{Val: "::1/128"}}
	fp.networkInterfacer.(*utilproxytest.FakeNetwork).AddInterfaceAddr(&itf, addrs)
	fp.networkInterfacer.(*utilproxytest.FakeNetwork).AddInterfaceAddr(&itf1, addrs1)
	fp.nodePortAddresses = []string{}

	fp.syncProxyRules()

	proto := strings.ToLower(string(v1.ProtocolTCP))
	svcChain := string(servicePortChainName(svcPortName.String(), proto))

	kubeNodePortRules := ipt.GetRules(string(kubeNodePortsChain))
	if !hasJump(kubeNodePortRules, svcChain, "", svcNodePort) {
		errorf(fmt.Sprintf("Failed to find jump to svc chain %v", svcChain), kubeNodePortRules, t)
	}
}

func TestMasqueradeRule(t *testing.T) {
	for _, testcase := range []bool{false, true} {
		ipt := iptablestest.NewFake().SetHasRandomFully(testcase)
		fp := NewFakeProxier(ipt, false)
		makeServiceMap(fp)
		makeEndpointsMap(fp)
		fp.syncProxyRules()

		postRoutingRules := ipt.GetRules(string(kubePostroutingChain))
		if !hasJump(postRoutingRules, "MASQUERADE", "", 0) {
			errorf(fmt.Sprintf("Failed to find -j MASQUERADE in %s chain", kubePostroutingChain), postRoutingRules, t)
		}
		if hasMasqRandomFully(postRoutingRules) != testcase {
			probs := map[bool]string{false: "found", true: "did not find"}
			errorf(fmt.Sprintf("%s --random-fully in -j MASQUERADE rule in %s chain when HasRandomFully()==%v", probs[testcase], kubePostroutingChain, testcase), postRoutingRules, t)
		}
	}
}

func TestExternalIPsReject(t *testing.T) {
	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, false)
	svcIP := "10.20.30.41"
	svcPort := 80
	svcExternalIPs := "50.60.70.81"
	svcPortName := proxy.ServicePortName{
		NamespacedName: makeNSN("ns1", "svc1"),
		Port:           "p80",
	}

	makeServiceMap(fp,
		makeTestService(svcPortName.Namespace, svcPortName.Name, func(svc *v1.Service) {
			svc.Spec.Type = "ClusterIP"
			svc.Spec.ClusterIP = svcIP
			svc.Spec.ExternalIPs = []string{svcExternalIPs}
			svc.Spec.Ports = []v1.ServicePort{{
				Name:       svcPortName.Port,
				Port:       int32(svcPort),
				Protocol:   v1.ProtocolTCP,
				TargetPort: intstr.FromInt(svcPort),
			}}
		}),
	)
	makeEndpointsMap(fp)

	fp.syncProxyRules()

	kubeSvcRules := ipt.GetRules(string(kubeExternalServicesChain))
	if !hasJump(kubeSvcRules, iptablestest.Reject, svcExternalIPs, svcPort) {
		errorf(fmt.Sprintf("Failed to find a %v rule for externalIP %v with no endpoints", iptablestest.Reject, svcPortName), kubeSvcRules, t)
	}
}

func TestOnlyLocalExternalIPs(t *testing.T) {
	// TODO(freehan): remove this in k8s 1.19
	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.ExternalPolicyForExternalIP, true)()

	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, false)
	svcIP := "10.20.30.41"
	svcPort := 80
	svcExternalIPs := "50.60.70.81"
	svcPortName := proxy.ServicePortName{
		NamespacedName: makeNSN("ns1", "svc1"),
		Port:           "p80",
	}

	makeServiceMap(fp,
		makeTestService(svcPortName.Namespace, svcPortName.Name, func(svc *v1.Service) {
			svc.Spec.Type = "NodePort"
			svc.Spec.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyTypeLocal
			svc.Spec.ClusterIP = svcIP
			svc.Spec.ExternalIPs = []string{svcExternalIPs}
			svc.Spec.Ports = []v1.ServicePort{{
				Name:       svcPortName.Port,
				Port:       int32(svcPort),
				Protocol:   v1.ProtocolTCP,
				TargetPort: intstr.FromInt(svcPort),
			}}
		}),
	)
	makeEndpointsMap(fp)
	epIP1 := "10.180.0.1"
	epIP2 := "10.180.2.1"
	epStrLocal := fmt.Sprintf("%s:%d", epIP1, svcPort)
	epStrNonLocal := fmt.Sprintf("%s:%d", epIP2, svcPort)
	makeEndpointsMap(fp,
		makeTestEndpoints(svcPortName.Namespace, svcPortName.Name, func(ept *v1.Endpoints) {
			ept.Subsets = []v1.EndpointSubset{{
				Addresses: []v1.EndpointAddress{{
					IP:       epIP1,
					NodeName: nil,
				}, {
					IP:       epIP2,
					NodeName: utilpointer.StringPtr(testHostname),
				}},
				Ports: []v1.EndpointPort{{
					Name:     svcPortName.Port,
					Port:     int32(svcPort),
					Protocol: v1.ProtocolTCP,
				}},
			}}
		}),
	)

	fp.syncProxyRules()

	proto := strings.ToLower(string(v1.ProtocolTCP))
	lbChain := string(serviceLBChainName(svcPortName.String(), proto))

	nonLocalEpChain := string(servicePortEndpointChainName(svcPortName.String(), strings.ToLower(string(v1.ProtocolTCP)), epStrLocal))
	localEpChain := string(servicePortEndpointChainName(svcPortName.String(), strings.ToLower(string(v1.ProtocolTCP)), epStrNonLocal))

	kubeSvcRules := ipt.GetRules(string(kubeServicesChain))
	if !hasJump(kubeSvcRules, lbChain, svcExternalIPs, svcPort) {
		errorf(fmt.Sprintf("Failed to find jump to xlb chain %v", lbChain), kubeSvcRules, t)
	}

	lbRules := ipt.GetRules(lbChain)
	if hasJump(lbRules, nonLocalEpChain, "", 0) {
		errorf(fmt.Sprintf("Found jump from lb chain %v to non-local ep %v", lbChain, epStrLocal), lbRules, t)
	}
	if !hasJump(lbRules, localEpChain, "", 0) {
		errorf(fmt.Sprintf("Didn't find jump from lb chain %v to local ep %v", lbChain, epStrNonLocal), lbRules, t)
	}
}

func TestNodePortReject(t *testing.T) {
	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, false)
	svcIP := "10.20.30.41"
	svcPort := 80
	svcNodePort := 3001
	svcPortName := proxy.ServicePortName{
		NamespacedName: makeNSN("ns1", "svc1"),
		Port:           "p80",
	}

	makeServiceMap(fp,
		makeTestService(svcPortName.Namespace, svcPortName.Name, func(svc *v1.Service) {
			svc.Spec.Type = "NodePort"
			svc.Spec.ClusterIP = svcIP
			svc.Spec.Ports = []v1.ServicePort{{
				Name:     svcPortName.Port,
				Port:     int32(svcPort),
				Protocol: v1.ProtocolTCP,
				NodePort: int32(svcNodePort),
			}}
		}),
	)
	makeEndpointsMap(fp)

	fp.syncProxyRules()

	kubeSvcRules := ipt.GetRules(string(kubeExternalServicesChain))
	if !hasJump(kubeSvcRules, iptablestest.Reject, svcIP, svcNodePort) {
		errorf(fmt.Sprintf("Failed to find a %v rule for service %v with no endpoints", iptablestest.Reject, svcPortName), kubeSvcRules, t)
	}
}

func TestOnlyLocalLoadBalancing(t *testing.T) {
	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, false)
	svcIP := "10.20.30.41"
	svcPort := 80
	svcNodePort := 3001
	svcLBIP := "1.2.3.4"
	svcPortName := proxy.ServicePortName{
		NamespacedName: makeNSN("ns1", "svc1"),
		Port:           "p80",
		Protocol:       v1.ProtocolTCP,
	}
	svcSessionAffinityTimeout := int32(10800)

	makeServiceMap(fp,
		makeTestService(svcPortName.Namespace, svcPortName.Name, func(svc *v1.Service) {
			svc.Spec.Type = "LoadBalancer"
			svc.Spec.ClusterIP = svcIP
			svc.Spec.Ports = []v1.ServicePort{{
				Name:     svcPortName.Port,
				Port:     int32(svcPort),
				Protocol: v1.ProtocolTCP,
				NodePort: int32(svcNodePort),
			}}
			svc.Status.LoadBalancer.Ingress = []v1.LoadBalancerIngress{{
				IP: svcLBIP,
			}}
			svc.Spec.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyTypeLocal
			svc.Spec.SessionAffinity = v1.ServiceAffinityClientIP
			svc.Spec.SessionAffinityConfig = &v1.SessionAffinityConfig{
				ClientIP: &v1.ClientIPConfig{TimeoutSeconds: &svcSessionAffinityTimeout},
			}
		}),
	)

	epIP1 := "10.180.0.1"
	epIP2 := "10.180.2.1"
	epStrLocal := fmt.Sprintf("%s:%d", epIP1, svcPort)
	epStrNonLocal := fmt.Sprintf("%s:%d", epIP2, svcPort)
	makeEndpointsMap(fp,
		makeTestEndpoints(svcPortName.Namespace, svcPortName.Name, func(ept *v1.Endpoints) {
			ept.Subsets = []v1.EndpointSubset{{
				Addresses: []v1.EndpointAddress{{
					IP:       epIP1,
					NodeName: nil,
				}, {
					IP:       epIP2,
					NodeName: utilpointer.StringPtr(testHostname),
				}},
				Ports: []v1.EndpointPort{{
					Name:     svcPortName.Port,
					Port:     int32(svcPort),
					Protocol: v1.ProtocolTCP,
				}},
			}}
		}),
	)

	fp.syncProxyRules()

	proto := strings.ToLower(string(v1.ProtocolTCP))
	fwChain := string(serviceFirewallChainName(svcPortName.String(), proto))
	lbChain := string(serviceLBChainName(svcPortName.String(), proto))

	nonLocalEpChain := string(servicePortEndpointChainName(svcPortName.String(), strings.ToLower(string(v1.ProtocolTCP)), epStrLocal))
	localEpChain := string(servicePortEndpointChainName(svcPortName.String(), strings.ToLower(string(v1.ProtocolTCP)), epStrNonLocal))

	kubeSvcRules := ipt.GetRules(string(kubeServicesChain))
	if !hasJump(kubeSvcRules, fwChain, svcLBIP, svcPort) {
		errorf(fmt.Sprintf("Failed to find jump to firewall chain %v", fwChain), kubeSvcRules, t)
	}

	fwRules := ipt.GetRules(fwChain)
	if !hasJump(fwRules, lbChain, "", 0) {
		errorf(fmt.Sprintf("Failed to find jump from firewall chain %v to svc chain %v", fwChain, lbChain), fwRules, t)
	}
	if hasJump(fwRules, string(KubeMarkMasqChain), "", 0) {
		errorf(fmt.Sprintf("Found jump from fw chain %v to MASQUERADE", fwChain), fwRules, t)
	}

	lbRules := ipt.GetRules(lbChain)
	if hasJump(lbRules, nonLocalEpChain, "", 0) {
		errorf(fmt.Sprintf("Found jump from lb chain %v to non-local ep %v", lbChain, epStrLocal), lbRules, t)
	}
	if !hasJump(lbRules, localEpChain, "", 0) {
		errorf(fmt.Sprintf("Didn't find jump from lb chain %v to local ep %v", lbChain, epStrNonLocal), lbRules, t)
	}
	if !hasSessionAffinityRule(lbRules) {
		errorf(fmt.Sprintf("Didn't find session affinity rule from lb chain %v", lbChain), lbRules, t)
	}
}

func TestOnlyLocalNodePortsNoClusterCIDR(t *testing.T) {
	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, false)
	onlyLocalNodePorts(t, fp, ipt)
}

func TestOnlyLocalNodePorts(t *testing.T) {
	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, false)
	onlyLocalNodePorts(t, fp, ipt)
}

func onlyLocalNodePorts(t *testing.T, fp *Proxier, ipt *iptablestest.FakeIPTables) {
	svcIP := "10.20.30.41"
	svcPort := 80
	svcNodePort := 3001
	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.Type = "NodePort"
			svc.Spec.ClusterIP = svcIP
			svc.Spec.Ports = []v1.ServicePort{{
				Name:     svcPortName.Port,
				Port:     int32(svcPort),
				Protocol: v1.ProtocolTCP,
				NodePort: int32(svcNodePort),
			}}
			svc.Spec.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyTypeLocal
		}),
	)

	epIP1 := "10.180.0.1"
	epIP2 := "10.180.2.1"
	epStrLocal := fmt.Sprintf("%s:%d", epIP1, svcPort)
	epStrNonLocal := fmt.Sprintf("%s:%d", epIP2, svcPort)
	makeEndpointsMap(fp,
		makeTestEndpoints(svcPortName.Namespace, svcPortName.Name, func(ept *v1.Endpoints) {
			ept.Subsets = []v1.EndpointSubset{{
				Addresses: []v1.EndpointAddress{{
					IP:       epIP1,
					NodeName: nil,
				}, {
					IP:       epIP2,
					NodeName: utilpointer.StringPtr(testHostname),
				}},
				Ports: []v1.EndpointPort{{
					Name:     svcPortName.Port,
					Port:     int32(svcPort),
					Protocol: v1.ProtocolTCP,
				}},
			}}
		}),
	)

	itf := net.Interface{Index: 0, MTU: 0, Name: "eth0", HardwareAddr: nil, Flags: 0}
	addrs := []net.Addr{utilproxytest.AddrStruct{Val: "10.20.30.51/24"}}
	fp.networkInterfacer.(*utilproxytest.FakeNetwork).AddInterfaceAddr(&itf, addrs)
	fp.nodePortAddresses = []string{"10.20.30.0/24"}

	fp.syncProxyRules()

	proto := strings.ToLower(string(v1.ProtocolTCP))
	lbChain := string(serviceLBChainName(svcPortName.String(), proto))

	nonLocalEpChain := string(servicePortEndpointChainName(svcPortName.String(), proto, epStrLocal))
	localEpChain := string(servicePortEndpointChainName(svcPortName.String(), proto, epStrNonLocal))

	kubeNodePortRules := ipt.GetRules(string(kubeNodePortsChain))
	if !hasJump(kubeNodePortRules, lbChain, "", svcNodePort) {
		errorf(fmt.Sprintf("Failed to find jump to lb chain %v", lbChain), kubeNodePortRules, t)
	}
	if !hasJump(kubeNodePortRules, string(KubeMarkMasqChain), "", svcNodePort) {
		errorf(fmt.Sprintf("Failed to find jump to %s chain for destination IP %d", KubeMarkMasqChain, svcNodePort), kubeNodePortRules, t)
	}

	kubeServiceRules := ipt.GetRules(string(kubeServicesChain))
	if !hasJump(kubeServiceRules, string(kubeNodePortsChain), "10.20.30.51", 0) {
		errorf(fmt.Sprintf("Failed to find jump to KUBE-NODEPORTS chain %v", string(kubeNodePortsChain)), kubeServiceRules, t)
	}

	svcChain := string(servicePortChainName(svcPortName.String(), proto))
	lbRules := ipt.GetRules(lbChain)
	if hasJump(lbRules, nonLocalEpChain, "", 0) {
		errorf(fmt.Sprintf("Found jump from lb chain %v to non-local ep %v", lbChain, epStrLocal), lbRules, t)
	}
	if !hasJump(lbRules, svcChain, "", 0) || !hasSrcType(lbRules, "LOCAL") {
		errorf(fmt.Sprintf("Did not find jump from lb chain %v to svc %v with src-type LOCAL", lbChain, svcChain), lbRules, t)
	}
	if !hasJump(lbRules, localEpChain, "", 0) {
		errorf(fmt.Sprintf("Didn't find jump from lb chain %v to local ep %v", lbChain, epStrLocal), lbRules, t)
	}
}

func TestComputeProbability(t *testing.T) {
	expectedProbabilities := map[int]string{
		1:      "1.0000000000",
		2:      "0.5000000000",
		10:     "0.1000000000",
		100:    "0.0100000000",
		1000:   "0.0010000000",
		10000:  "0.0001000000",
		100000: "0.0000100000",
		100001: "0.0000099999",
	}

	for num, expected := range expectedProbabilities {
		actual := computeProbability(num)
		if actual != expected {
			t.Errorf("Expected computeProbability(%d) to be %s, got: %s", num, expected, actual)
		}
	}

	prevProbability := float64(0)
	for i := 100000; i > 1; i-- {
		currProbability, err := strconv.ParseFloat(computeProbability(i), 64)
		if err != nil {
			t.Fatalf("Error parsing float probability for %d: %v", i, err)
		}
		if currProbability <= prevProbability {
			t.Fatalf("Probability unexpectedly <= to previous probability for %d: (%0.10f <= %0.10f)", i, currProbability, prevProbability)
		}
		prevProbability = currProbability
	}
}

func makeTestService(namespace, name string, svcFunc func(*v1.Service)) *v1.Service {
	svc := &v1.Service{
		ObjectMeta: metav1.ObjectMeta{
			Name:        name,
			Namespace:   namespace,
			Annotations: map[string]string{},
		},
		Spec:   v1.ServiceSpec{},
		Status: v1.ServiceStatus{},
	}
	svcFunc(svc)
	return svc
}

func addTestPort(array []v1.ServicePort, name string, protocol v1.Protocol, port, nodeport int32, targetPort int) []v1.ServicePort {
	svcPort := v1.ServicePort{
		Name:       name,
		Protocol:   protocol,
		Port:       port,
		NodePort:   nodeport,
		TargetPort: intstr.FromInt(targetPort),
	}
	return append(array, svcPort)
}

func TestBuildServiceMapAddRemove(t *testing.T) {
	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, false)

	services := []*v1.Service{
		makeTestService("somewhere-else", "cluster-ip", func(svc *v1.Service) {
			svc.Spec.Type = v1.ServiceTypeClusterIP
			svc.Spec.ClusterIP = "172.16.55.4"
			svc.Spec.Ports = addTestPort(svc.Spec.Ports, "something", "UDP", 1234, 4321, 0)
			svc.Spec.Ports = addTestPort(svc.Spec.Ports, "somethingelse", "UDP", 1235, 5321, 0)
			svc.Spec.Ports = addTestPort(svc.Spec.Ports, "sctpport", "SCTP", 1236, 6321, 0)
		}),
		makeTestService("somewhere-else", "node-port", func(svc *v1.Service) {
			svc.Spec.Type = v1.ServiceTypeNodePort
			svc.Spec.ClusterIP = "172.16.55.10"
			svc.Spec.Ports = addTestPort(svc.Spec.Ports, "blahblah", "UDP", 345, 678, 0)
			svc.Spec.Ports = addTestPort(svc.Spec.Ports, "moreblahblah", "TCP", 344, 677, 0)
			svc.Spec.Ports = addTestPort(svc.Spec.Ports, "muchmoreblah", "SCTP", 343, 676, 0)
		}),
		makeTestService("somewhere", "load-balancer", func(svc *v1.Service) {
			svc.Spec.Type = v1.ServiceTypeLoadBalancer
			svc.Spec.ClusterIP = "172.16.55.11"
			svc.Spec.LoadBalancerIP = "5.6.7.8"
			svc.Spec.Ports = addTestPort(svc.Spec.Ports, "foobar", "UDP", 8675, 30061, 7000)
			svc.Spec.Ports = addTestPort(svc.Spec.Ports, "baz", "UDP", 8676, 30062, 7001)
			svc.Status.LoadBalancer = v1.LoadBalancerStatus{
				Ingress: []v1.LoadBalancerIngress{
					{IP: "10.1.2.4"},
				},
			}
		}),
		makeTestService("somewhere", "only-local-load-balancer", func(svc *v1.Service) {
			svc.Spec.Type = v1.ServiceTypeLoadBalancer
			svc.Spec.ClusterIP = "172.16.55.12"
			svc.Spec.LoadBalancerIP = "5.6.7.8"
			svc.Spec.Ports = addTestPort(svc.Spec.Ports, "foobar2", "UDP", 8677, 30063, 7002)
			svc.Spec.Ports = addTestPort(svc.Spec.Ports, "baz", "UDP", 8678, 30064, 7003)
			svc.Status.LoadBalancer = v1.LoadBalancerStatus{
				Ingress: []v1.LoadBalancerIngress{
					{IP: "10.1.2.3"},
				},
			}
			svc.Spec.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyTypeLocal
			svc.Spec.HealthCheckNodePort = 345
		}),
	}

	for i := range services {
		fp.OnServiceAdd(services[i])
	}
	result := proxy.UpdateServiceMap(fp.serviceMap, fp.serviceChanges)
	if len(fp.serviceMap) != 10 {
		t.Errorf("expected service map length 10, got %v", fp.serviceMap)
	}

	// The only-local-loadbalancer ones get added
	if len(result.HCServiceNodePorts) != 1 {
		t.Errorf("expected 1 healthcheck port, got %v", result.HCServiceNodePorts)
	} else {
		nsn := makeNSN("somewhere", "only-local-load-balancer")
		if port, found := result.HCServiceNodePorts[nsn]; !found || port != 345 {
			t.Errorf("expected healthcheck port [%q]=345: got %v", nsn, result.HCServiceNodePorts)
		}
	}

	if len(result.UDPStaleClusterIP) != 0 {
		// Services only added, so nothing stale yet
		t.Errorf("expected stale UDP services length 0, got %d", len(result.UDPStaleClusterIP))
	}

	// Remove some stuff
	// oneService is a modification of services[0] with removed first port.
	oneService := makeTestService("somewhere-else", "cluster-ip", func(svc *v1.Service) {
		svc.Spec.Type = v1.ServiceTypeClusterIP
		svc.Spec.ClusterIP = "172.16.55.4"
		svc.Spec.Ports = addTestPort(svc.Spec.Ports, "somethingelse", "UDP", 1235, 5321, 0)
	})

	fp.OnServiceUpdate(services[0], oneService)
	fp.OnServiceDelete(services[1])
	fp.OnServiceDelete(services[2])
	fp.OnServiceDelete(services[3])

	result = proxy.UpdateServiceMap(fp.serviceMap, fp.serviceChanges)
	if len(fp.serviceMap) != 1 {
		t.Errorf("expected service map length 1, got %v", fp.serviceMap)
	}

	if len(result.HCServiceNodePorts) != 0 {
		t.Errorf("expected 0 healthcheck ports, got %v", result.HCServiceNodePorts)
	}

	// All services but one were deleted. While you'd expect only the ClusterIPs
	// from the three deleted services here, we still have the ClusterIP for
	// the not-deleted service, because one of it's ServicePorts was deleted.
	expectedStaleUDPServices := []string{"172.16.55.10", "172.16.55.4", "172.16.55.11", "172.16.55.12"}
	if len(result.UDPStaleClusterIP) != len(expectedStaleUDPServices) {
		t.Errorf("expected stale UDP services length %d, got %v", len(expectedStaleUDPServices), result.UDPStaleClusterIP.UnsortedList())
	}
	for _, ip := range expectedStaleUDPServices {
		if !result.UDPStaleClusterIP.Has(ip) {
			t.Errorf("expected stale UDP service service %s", ip)
		}
	}
}

func TestBuildServiceMapServiceHeadless(t *testing.T) {
	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, false)

	makeServiceMap(fp,
		makeTestService("somewhere-else", "headless", func(svc *v1.Service) {
			svc.Spec.Type = v1.ServiceTypeClusterIP
			svc.Spec.ClusterIP = v1.ClusterIPNone
			svc.Spec.Ports = addTestPort(svc.Spec.Ports, "rpc", "UDP", 1234, 0, 0)
		}),
		makeTestService("somewhere-else", "headless-without-port", func(svc *v1.Service) {
			svc.Spec.Type = v1.ServiceTypeClusterIP
			svc.Spec.ClusterIP = v1.ClusterIPNone
		}),
	)

	// Headless service should be ignored
	result := proxy.UpdateServiceMap(fp.serviceMap, fp.serviceChanges)
	if len(fp.serviceMap) != 0 {
		t.Errorf("expected service map length 0, got %d", len(fp.serviceMap))
	}

	// No proxied services, so no healthchecks
	if len(result.HCServiceNodePorts) != 0 {
		t.Errorf("expected healthcheck ports length 0, got %d", len(result.HCServiceNodePorts))
	}

	if len(result.UDPStaleClusterIP) != 0 {
		t.Errorf("expected stale UDP services length 0, got %d", len(result.UDPStaleClusterIP))
	}
}

func TestBuildServiceMapServiceTypeExternalName(t *testing.T) {
	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, false)

	makeServiceMap(fp,
		makeTestService("somewhere-else", "external-name", func(svc *v1.Service) {
			svc.Spec.Type = v1.ServiceTypeExternalName
			svc.Spec.ClusterIP = "172.16.55.4" // Should be ignored
			svc.Spec.ExternalName = "foo2.bar.com"
			svc.Spec.Ports = addTestPort(svc.Spec.Ports, "blah", "UDP", 1235, 5321, 0)
		}),
	)

	result := proxy.UpdateServiceMap(fp.serviceMap, fp.serviceChanges)
	if len(fp.serviceMap) != 0 {
		t.Errorf("expected service map length 0, got %v", fp.serviceMap)
	}
	// No proxied services, so no healthchecks
	if len(result.HCServiceNodePorts) != 0 {
		t.Errorf("expected healthcheck ports length 0, got %v", result.HCServiceNodePorts)
	}
	if len(result.UDPStaleClusterIP) != 0 {
		t.Errorf("expected stale UDP services length 0, got %v", result.UDPStaleClusterIP)
	}
}

func TestBuildServiceMapServiceUpdate(t *testing.T) {
	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, false)

	servicev1 := makeTestService("somewhere", "some-service", func(svc *v1.Service) {
		svc.Spec.Type = v1.ServiceTypeClusterIP
		svc.Spec.ClusterIP = "172.16.55.4"
		svc.Spec.Ports = addTestPort(svc.Spec.Ports, "something", "UDP", 1234, 4321, 0)
		svc.Spec.Ports = addTestPort(svc.Spec.Ports, "somethingelse", "TCP", 1235, 5321, 0)
	})
	servicev2 := makeTestService("somewhere", "some-service", func(svc *v1.Service) {
		svc.Spec.Type = v1.ServiceTypeLoadBalancer
		svc.Spec.ClusterIP = "172.16.55.4"
		svc.Spec.LoadBalancerIP = "5.6.7.8"
		svc.Spec.Ports = addTestPort(svc.Spec.Ports, "something", "UDP", 1234, 4321, 7002)
		svc.Spec.Ports = addTestPort(svc.Spec.Ports, "somethingelse", "TCP", 1235, 5321, 7003)
		svc.Status.LoadBalancer = v1.LoadBalancerStatus{
			Ingress: []v1.LoadBalancerIngress{
				{IP: "10.1.2.3"},
			},
		}
		svc.Spec.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyTypeLocal
		svc.Spec.HealthCheckNodePort = 345
	})

	fp.OnServiceAdd(servicev1)

	result := proxy.UpdateServiceMap(fp.serviceMap, fp.serviceChanges)
	if len(fp.serviceMap) != 2 {
		t.Errorf("expected service map length 2, got %v", fp.serviceMap)
	}
	if len(result.HCServiceNodePorts) != 0 {
		t.Errorf("expected healthcheck ports length 0, got %v", result.HCServiceNodePorts)
	}
	if len(result.UDPStaleClusterIP) != 0 {
		// Services only added, so nothing stale yet
		t.Errorf("expected stale UDP services length 0, got %d", len(result.UDPStaleClusterIP))
	}

	// Change service to load-balancer
	fp.OnServiceUpdate(servicev1, servicev2)
	result = proxy.UpdateServiceMap(fp.serviceMap, fp.serviceChanges)
	if len(fp.serviceMap) != 2 {
		t.Errorf("expected service map length 2, got %v", fp.serviceMap)
	}
	if len(result.HCServiceNodePorts) != 1 {
		t.Errorf("expected healthcheck ports length 1, got %v", result.HCServiceNodePorts)
	}
	if len(result.UDPStaleClusterIP) != 0 {
		t.Errorf("expected stale UDP services length 0, got %v", result.UDPStaleClusterIP.UnsortedList())
	}

	// No change; make sure the service map stays the same and there are
	// no health-check changes
	fp.OnServiceUpdate(servicev2, servicev2)
	result = proxy.UpdateServiceMap(fp.serviceMap, fp.serviceChanges)
	if len(fp.serviceMap) != 2 {
		t.Errorf("expected service map length 2, got %v", fp.serviceMap)
	}
	if len(result.HCServiceNodePorts) != 1 {
		t.Errorf("expected healthcheck ports length 1, got %v", result.HCServiceNodePorts)
	}
	if len(result.UDPStaleClusterIP) != 0 {
		t.Errorf("expected stale UDP services length 0, got %v", result.UDPStaleClusterIP.UnsortedList())
	}

	// And back to ClusterIP
	fp.OnServiceUpdate(servicev2, servicev1)
	result = proxy.UpdateServiceMap(fp.serviceMap, fp.serviceChanges)
	if len(fp.serviceMap) != 2 {
		t.Errorf("expected service map length 2, got %v", fp.serviceMap)
	}
	if len(result.HCServiceNodePorts) != 0 {
		t.Errorf("expected healthcheck ports length 0, got %v", result.HCServiceNodePorts)
	}
	if len(result.UDPStaleClusterIP) != 0 {
		// Services only added, so nothing stale yet
		t.Errorf("expected stale UDP services length 0, got %d", len(result.UDPStaleClusterIP))
	}
}

func makeTestEndpoints(namespace, name string, eptFunc func(*v1.Endpoints)) *v1.Endpoints {
	ept := &v1.Endpoints{
		ObjectMeta: metav1.ObjectMeta{
			Name:      name,
			Namespace: namespace,
		},
	}
	eptFunc(ept)
	return ept
}

func makeEndpointsMap(proxier *Proxier, allEndpoints ...*v1.Endpoints) {
	for i := range allEndpoints {
		proxier.OnEndpointsAdd(allEndpoints[i])
	}

	proxier.mu.Lock()
	defer proxier.mu.Unlock()
	proxier.endpointsSynced = true
}

func makeNSN(namespace, name string) types.NamespacedName {
	return types.NamespacedName{Namespace: namespace, Name: name}
}

func makeServicePortName(ns, name, port string, protocol v1.Protocol) proxy.ServicePortName {
	return proxy.ServicePortName{
		NamespacedName: makeNSN(ns, name),
		Port:           port,
		Protocol:       protocol,
	}
}

func makeServiceMap(proxier *Proxier, allServices ...*v1.Service) {
	for i := range allServices {
		proxier.OnServiceAdd(allServices[i])
	}

	proxier.mu.Lock()
	defer proxier.mu.Unlock()
	proxier.servicesSynced = true
}

func compareEndpointsMaps(t *testing.T, tci int, newMap proxy.EndpointsMap, expected map[proxy.ServicePortName][]*endpointsInfo) {
	if len(newMap) != len(expected) {
		t.Errorf("[%d] expected %d results, got %d: %v", tci, len(expected), len(newMap), newMap)
	}
	for x := range expected {
		if len(newMap[x]) != len(expected[x]) {
			t.Errorf("[%d] expected %d endpoints for %v, got %d", tci, len(expected[x]), x, len(newMap[x]))
		} else {
			for i := range expected[x] {
				newEp, ok := newMap[x][i].(*endpointsInfo)
				if !ok {
					t.Errorf("Failed to cast endpointsInfo")
					continue
				}
				if newEp.Endpoint != expected[x][i].Endpoint ||
					newEp.IsLocal != expected[x][i].IsLocal ||
					newEp.protocol != expected[x][i].protocol ||
					newEp.chainName != expected[x][i].chainName {
					t.Errorf("[%d] expected new[%v][%d] to be %v, got %v", tci, x, i, expected[x][i], newEp)
				}
			}
		}
	}
}

func Test_updateEndpointsMap(t *testing.T) {
	var nodeName = testHostname

	emptyEndpoint := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{}
	}
	unnamedPort := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.1",
			}},
			Ports: []v1.EndpointPort{{
				Port:     11,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	unnamedPortLocal := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP:       "1.1.1.1",
				NodeName: &nodeName,
			}},
			Ports: []v1.EndpointPort{{
				Port:     11,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	namedPortLocal := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP:       "1.1.1.1",
				NodeName: &nodeName,
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p11",
				Port:     11,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	namedPort := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.1",
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p11",
				Port:     11,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	namedPortRenamed := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.1",
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p11-2",
				Port:     11,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	namedPortRenumbered := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.1",
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p11",
				Port:     22,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	namedPortsLocalNoLocal := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.1",
			}, {
				IP:       "1.1.1.2",
				NodeName: &nodeName,
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p11",
				Port:     11,
				Protocol: v1.ProtocolUDP,
			}, {
				Name:     "p12",
				Port:     12,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	multipleSubsets := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.1",
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p11",
				Port:     11,
				Protocol: v1.ProtocolUDP,
			}},
		}, {
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.2",
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p12",
				Port:     12,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	multipleSubsetsWithLocal := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.1",
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p11",
				Port:     11,
				Protocol: v1.ProtocolUDP,
			}},
		}, {
			Addresses: []v1.EndpointAddress{{
				IP:       "1.1.1.2",
				NodeName: &nodeName,
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p12",
				Port:     12,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	multipleSubsetsMultiplePortsLocal := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP:       "1.1.1.1",
				NodeName: &nodeName,
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p11",
				Port:     11,
				Protocol: v1.ProtocolUDP,
			}, {
				Name:     "p12",
				Port:     12,
				Protocol: v1.ProtocolUDP,
			}},
		}, {
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.3",
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p13",
				Port:     13,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	multipleSubsetsIPsPorts1 := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.1",
			}, {
				IP:       "1.1.1.2",
				NodeName: &nodeName,
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p11",
				Port:     11,
				Protocol: v1.ProtocolUDP,
			}, {
				Name:     "p12",
				Port:     12,
				Protocol: v1.ProtocolUDP,
			}},
		}, {
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.3",
			}, {
				IP:       "1.1.1.4",
				NodeName: &nodeName,
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p13",
				Port:     13,
				Protocol: v1.ProtocolUDP,
			}, {
				Name:     "p14",
				Port:     14,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	multipleSubsetsIPsPorts2 := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP: "2.2.2.1",
			}, {
				IP:       "2.2.2.2",
				NodeName: &nodeName,
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p21",
				Port:     21,
				Protocol: v1.ProtocolUDP,
			}, {
				Name:     "p22",
				Port:     22,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	complexBefore1 := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.1",
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p11",
				Port:     11,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	complexBefore2 := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP:       "2.2.2.2",
				NodeName: &nodeName,
			}, {
				IP:       "2.2.2.22",
				NodeName: &nodeName,
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p22",
				Port:     22,
				Protocol: v1.ProtocolUDP,
			}},
		}, {
			Addresses: []v1.EndpointAddress{{
				IP:       "2.2.2.3",
				NodeName: &nodeName,
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p23",
				Port:     23,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	complexBefore4 := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP:       "4.4.4.4",
				NodeName: &nodeName,
			}, {
				IP:       "4.4.4.5",
				NodeName: &nodeName,
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p44",
				Port:     44,
				Protocol: v1.ProtocolUDP,
			}},
		}, {
			Addresses: []v1.EndpointAddress{{
				IP:       "4.4.4.6",
				NodeName: &nodeName,
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p45",
				Port:     45,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	complexAfter1 := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.1",
			}, {
				IP: "1.1.1.11",
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p11",
				Port:     11,
				Protocol: v1.ProtocolUDP,
			}},
		}, {
			Addresses: []v1.EndpointAddress{{
				IP: "1.1.1.2",
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p12",
				Port:     12,
				Protocol: v1.ProtocolUDP,
			}, {
				Name:     "p122",
				Port:     122,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	complexAfter3 := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP: "3.3.3.3",
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p33",
				Port:     33,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}
	complexAfter4 := func(ept *v1.Endpoints) {
		ept.Subsets = []v1.EndpointSubset{{
			Addresses: []v1.EndpointAddress{{
				IP:       "4.4.4.4",
				NodeName: &nodeName,
			}},
			Ports: []v1.EndpointPort{{
				Name:     "p44",
				Port:     44,
				Protocol: v1.ProtocolUDP,
			}},
		}}
	}

	testCases := []struct {
		// previousEndpoints and currentEndpoints are used to call appropriate
		// handlers OnEndpoints* (based on whether corresponding values are nil
		// or non-nil) and must be of equal length.
		previousEndpoints         []*v1.Endpoints
		currentEndpoints          []*v1.Endpoints
		oldEndpoints              map[proxy.ServicePortName][]*endpointsInfo
		expectedResult            map[proxy.ServicePortName][]*endpointsInfo
		expectedStaleEndpoints    []proxy.ServiceEndpoint
		expectedStaleServiceNames map[proxy.ServicePortName]bool
		expectedHealthchecks      map[types.NamespacedName]int
	}{{
		// Case[0]: nothing
		oldEndpoints:              map[proxy.ServicePortName][]*endpointsInfo{},
		expectedResult:            map[proxy.ServicePortName][]*endpointsInfo{},
		expectedStaleEndpoints:    []proxy.ServiceEndpoint{},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{},
		expectedHealthchecks:      map[types.NamespacedName]int{},
	}, {
		// Case[1]: no change, unnamed port
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", unnamedPort),
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", unnamedPort),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
		},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
		},
		expectedStaleEndpoints:    []proxy.ServiceEndpoint{},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{},
		expectedHealthchecks:      map[types.NamespacedName]int{},
	}, {
		// Case[2]: no change, named port, local
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", namedPortLocal),
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", namedPortLocal),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: true}},
			},
		},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: true}},
			},
		},
		expectedStaleEndpoints:    []proxy.ServiceEndpoint{},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{},
		expectedHealthchecks: map[types.NamespacedName]int{
			makeNSN("ns1", "ep1"): 1,
		},
	}, {
		// Case[3]: no change, multiple subsets
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", multipleSubsets),
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", multipleSubsets),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:12", IsLocal: false}},
			},
		},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:12", IsLocal: false}},
			},
		},
		expectedStaleEndpoints:    []proxy.ServiceEndpoint{},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{},
		expectedHealthchecks:      map[types.NamespacedName]int{},
	}, {
		// Case[4]: no change, multiple subsets, multiple ports, local
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", multipleSubsetsMultiplePortsLocal),
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", multipleSubsetsMultiplePortsLocal),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: true}},
			},
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:12", IsLocal: true}},
			},
			makeServicePortName("ns1", "ep1", "p13", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.3:13", IsLocal: false}},
			},
		},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: true}},
			},
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:12", IsLocal: true}},
			},
			makeServicePortName("ns1", "ep1", "p13", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.3:13", IsLocal: false}},
			},
		},
		expectedStaleEndpoints:    []proxy.ServiceEndpoint{},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{},
		expectedHealthchecks: map[types.NamespacedName]int{
			makeNSN("ns1", "ep1"): 1,
		},
	}, {
		// Case[5]: no change, multiple endpoints, subsets, IPs, and ports
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", multipleSubsetsIPsPorts1),
			makeTestEndpoints("ns2", "ep2", multipleSubsetsIPsPorts2),
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", multipleSubsetsIPsPorts1),
			makeTestEndpoints("ns2", "ep2", multipleSubsetsIPsPorts2),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:11", IsLocal: true}},
			},
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:12", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:12", IsLocal: true}},
			},
			makeServicePortName("ns1", "ep1", "p13", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.3:13", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.4:13", IsLocal: true}},
			},
			makeServicePortName("ns1", "ep1", "p14", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.3:14", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.4:14", IsLocal: true}},
			},
			makeServicePortName("ns2", "ep2", "p21", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "2.2.2.1:21", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "2.2.2.2:21", IsLocal: true}},
			},
			makeServicePortName("ns2", "ep2", "p22", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "2.2.2.1:22", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "2.2.2.2:22", IsLocal: true}},
			},
		},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:11", IsLocal: true}},
			},
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:12", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:12", IsLocal: true}},
			},
			makeServicePortName("ns1", "ep1", "p13", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.3:13", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.4:13", IsLocal: true}},
			},
			makeServicePortName("ns1", "ep1", "p14", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.3:14", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.4:14", IsLocal: true}},
			},
			makeServicePortName("ns2", "ep2", "p21", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "2.2.2.1:21", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "2.2.2.2:21", IsLocal: true}},
			},
			makeServicePortName("ns2", "ep2", "p22", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "2.2.2.1:22", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "2.2.2.2:22", IsLocal: true}},
			},
		},
		expectedStaleEndpoints:    []proxy.ServiceEndpoint{},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{},
		expectedHealthchecks: map[types.NamespacedName]int{
			makeNSN("ns1", "ep1"): 2,
			makeNSN("ns2", "ep2"): 1,
		},
	}, {
		// Case[6]: add an Endpoints
		previousEndpoints: []*v1.Endpoints{
			nil,
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", unnamedPortLocal),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: true}},
			},
		},
		expectedStaleEndpoints: []proxy.ServiceEndpoint{},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{
			makeServicePortName("ns1", "ep1", "", v1.ProtocolUDP): true,
		},
		expectedHealthchecks: map[types.NamespacedName]int{
			makeNSN("ns1", "ep1"): 1,
		},
	}, {
		// Case[7]: remove an Endpoints
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", unnamedPortLocal),
		},
		currentEndpoints: []*v1.Endpoints{
			nil,
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: true}},
			},
		},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{},
		expectedStaleEndpoints: []proxy.ServiceEndpoint{{
			Endpoint:        "1.1.1.1:11",
			ServicePortName: makeServicePortName("ns1", "ep1", "", v1.ProtocolUDP),
		}},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{},
		expectedHealthchecks:      map[types.NamespacedName]int{},
	}, {
		// Case[8]: add an IP and port
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", namedPort),
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", namedPortsLocalNoLocal),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
		},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:11", IsLocal: true}},
			},
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:12", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:12", IsLocal: true}},
			},
		},
		expectedStaleEndpoints: []proxy.ServiceEndpoint{},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP): true,
		},
		expectedHealthchecks: map[types.NamespacedName]int{
			makeNSN("ns1", "ep1"): 1,
		},
	}, {
		// Case[9]: remove an IP and port
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", namedPortsLocalNoLocal),
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", namedPort),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:11", IsLocal: true}},
			},
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:12", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:12", IsLocal: true}},
			},
		},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
		},
		expectedStaleEndpoints: []proxy.ServiceEndpoint{{
			Endpoint:        "1.1.1.2:11",
			ServicePortName: makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP),
		}, {
			Endpoint:        "1.1.1.1:12",
			ServicePortName: makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP),
		}, {
			Endpoint:        "1.1.1.2:12",
			ServicePortName: makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP),
		}},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{},
		expectedHealthchecks:      map[types.NamespacedName]int{},
	}, {
		// Case[10]: add a subset
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", namedPort),
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", multipleSubsetsWithLocal),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
		},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:12", IsLocal: true}},
			},
		},
		expectedStaleEndpoints: []proxy.ServiceEndpoint{},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP): true,
		},
		expectedHealthchecks: map[types.NamespacedName]int{
			makeNSN("ns1", "ep1"): 1,
		},
	}, {
		// Case[11]: remove a subset
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", multipleSubsets),
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", namedPort),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:12", IsLocal: false}},
			},
		},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
		},
		expectedStaleEndpoints: []proxy.ServiceEndpoint{{
			Endpoint:        "1.1.1.2:12",
			ServicePortName: makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP),
		}},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{},
		expectedHealthchecks:      map[types.NamespacedName]int{},
	}, {
		// Case[12]: rename a port
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", namedPort),
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", namedPortRenamed),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
		},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11-2", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
		},
		expectedStaleEndpoints: []proxy.ServiceEndpoint{{
			Endpoint:        "1.1.1.1:11",
			ServicePortName: makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP),
		}},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{
			makeServicePortName("ns1", "ep1", "p11-2", v1.ProtocolUDP): true,
		},
		expectedHealthchecks: map[types.NamespacedName]int{},
	}, {
		// Case[13]: renumber a port
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", namedPort),
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", namedPortRenumbered),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
		},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:22", IsLocal: false}},
			},
		},
		expectedStaleEndpoints: []proxy.ServiceEndpoint{{
			Endpoint:        "1.1.1.1:11",
			ServicePortName: makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP),
		}},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{},
		expectedHealthchecks:      map[types.NamespacedName]int{},
	}, {
		// Case[14]: complex add and remove
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", complexBefore1),
			makeTestEndpoints("ns2", "ep2", complexBefore2),
			nil,
			makeTestEndpoints("ns4", "ep4", complexBefore4),
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", complexAfter1),
			nil,
			makeTestEndpoints("ns3", "ep3", complexAfter3),
			makeTestEndpoints("ns4", "ep4", complexAfter4),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
			makeServicePortName("ns2", "ep2", "p22", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "2.2.2.2:22", IsLocal: true}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "2.2.2.22:22", IsLocal: true}},
			},
			makeServicePortName("ns2", "ep2", "p23", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "2.2.2.3:23", IsLocal: true}},
			},
			makeServicePortName("ns4", "ep4", "p44", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "4.4.4.4:44", IsLocal: true}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "4.4.4.5:44", IsLocal: true}},
			},
			makeServicePortName("ns4", "ep4", "p45", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "4.4.4.6:45", IsLocal: true}},
			},
		},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "p11", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.11:11", IsLocal: false}},
			},
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:12", IsLocal: false}},
			},
			makeServicePortName("ns1", "ep1", "p122", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.2:122", IsLocal: false}},
			},
			makeServicePortName("ns3", "ep3", "p33", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "3.3.3.3:33", IsLocal: false}},
			},
			makeServicePortName("ns4", "ep4", "p44", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "4.4.4.4:44", IsLocal: true}},
			},
		},
		expectedStaleEndpoints: []proxy.ServiceEndpoint{{
			Endpoint:        "2.2.2.2:22",
			ServicePortName: makeServicePortName("ns2", "ep2", "p22", v1.ProtocolUDP),
		}, {
			Endpoint:        "2.2.2.22:22",
			ServicePortName: makeServicePortName("ns2", "ep2", "p22", v1.ProtocolUDP),
		}, {
			Endpoint:        "2.2.2.3:23",
			ServicePortName: makeServicePortName("ns2", "ep2", "p23", v1.ProtocolUDP),
		}, {
			Endpoint:        "4.4.4.5:44",
			ServicePortName: makeServicePortName("ns4", "ep4", "p44", v1.ProtocolUDP),
		}, {
			Endpoint:        "4.4.4.6:45",
			ServicePortName: makeServicePortName("ns4", "ep4", "p45", v1.ProtocolUDP),
		}},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{
			makeServicePortName("ns1", "ep1", "p12", v1.ProtocolUDP):  true,
			makeServicePortName("ns1", "ep1", "p122", v1.ProtocolUDP): true,
			makeServicePortName("ns3", "ep3", "p33", v1.ProtocolUDP):  true,
		},
		expectedHealthchecks: map[types.NamespacedName]int{
			makeNSN("ns4", "ep4"): 1,
		},
	}, {
		// Case[15]: change from 0 endpoint address to 1 unnamed port
		previousEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", emptyEndpoint),
		},
		currentEndpoints: []*v1.Endpoints{
			makeTestEndpoints("ns1", "ep1", unnamedPort),
		},
		oldEndpoints: map[proxy.ServicePortName][]*endpointsInfo{},
		expectedResult: map[proxy.ServicePortName][]*endpointsInfo{
			makeServicePortName("ns1", "ep1", "", v1.ProtocolUDP): {
				{BaseEndpointInfo: &proxy.BaseEndpointInfo{Endpoint: "1.1.1.1:11", IsLocal: false}},
			},
		},
		expectedStaleEndpoints: []proxy.ServiceEndpoint{},
		expectedStaleServiceNames: map[proxy.ServicePortName]bool{
			makeServicePortName("ns1", "ep1", "", v1.ProtocolUDP): true,
		},
		expectedHealthchecks: map[types.NamespacedName]int{},
	},
	}

	for tci, tc := range testCases {
		ipt := iptablestest.NewFake()
		fp := NewFakeProxier(ipt, false)
		fp.hostname = nodeName

		// First check that after adding all previous versions of endpoints,
		// the fp.oldEndpoints is as we expect.
		for i := range tc.previousEndpoints {
			if tc.previousEndpoints[i] != nil {
				fp.OnEndpointsAdd(tc.previousEndpoints[i])
			}
		}
		fp.endpointsMap.Update(fp.endpointsChanges)
		compareEndpointsMaps(t, tci, fp.endpointsMap, tc.oldEndpoints)

		// Now let's call appropriate handlers to get to state we want to be.
		if len(tc.previousEndpoints) != len(tc.currentEndpoints) {
			t.Fatalf("[%d] different lengths of previous and current endpoints", tci)
			continue
		}

		for i := range tc.previousEndpoints {
			prev, curr := tc.previousEndpoints[i], tc.currentEndpoints[i]
			switch {
			case prev == nil:
				fp.OnEndpointsAdd(curr)
			case curr == nil:
				fp.OnEndpointsDelete(prev)
			default:
				fp.OnEndpointsUpdate(prev, curr)
			}
		}
		result := fp.endpointsMap.Update(fp.endpointsChanges)
		newMap := fp.endpointsMap
		compareEndpointsMaps(t, tci, newMap, tc.expectedResult)
		if len(result.StaleEndpoints) != len(tc.expectedStaleEndpoints) {
			t.Errorf("[%d] expected %d staleEndpoints, got %d: %v", tci, len(tc.expectedStaleEndpoints), len(result.StaleEndpoints), result.StaleEndpoints)
		}
		for _, x := range tc.expectedStaleEndpoints {
			found := false
			for _, stale := range result.StaleEndpoints {
				if stale == x {
					found = true
					break
				}
			}
			if !found {
				t.Errorf("[%d] expected staleEndpoints[%v], but didn't find it: %v", tci, x, result.StaleEndpoints)
			}
		}
		if len(result.StaleServiceNames) != len(tc.expectedStaleServiceNames) {
			t.Errorf("[%d] expected %d staleServiceNames, got %d: %v", tci, len(tc.expectedStaleServiceNames), len(result.StaleServiceNames), result.StaleServiceNames)
		}
		for svcName := range tc.expectedStaleServiceNames {
			found := false
			for _, stale := range result.StaleServiceNames {
				if stale == svcName {
					found = true
				}
			}
			if !found {
				t.Errorf("[%d] expected staleServiceNames[%v], but didn't find it: %v", tci, svcName, result.StaleServiceNames)
			}
		}
		if !reflect.DeepEqual(result.HCEndpointsLocalIPSize, tc.expectedHealthchecks) {
			t.Errorf("[%d] expected healthchecks %v, got %v", tci, tc.expectedHealthchecks, result.HCEndpointsLocalIPSize)
		}
	}
}

// The majority of EndpointSlice specific tests are not iptables specific and focus on
// the shared EndpointChangeTracker and EndpointSliceCache. This test ensures that the
// iptables proxier supports translating EndpointSlices to iptables output.
func TestEndpointSliceE2E(t *testing.T) {
	expectedIPTablesWithSlice := `*filter
:KUBE-SERVICES - [0:0]
:KUBE-EXTERNAL-SERVICES - [0:0]
:KUBE-FORWARD - [0:0]
-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-AHZNAGK3SCETOS2T - [0:0]
:KUBE-SEP-PXD6POUVGD2I37UY - [0:0]
:KUBE-SEP-SOKZUIT7SCEVIP33 - [0:0]
:KUBE-SEP-WVE3FAB34S7NZGDJ - [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: cluster IP" -m tcp -p tcp -d 172.20.1.1/32 --dport 0 ! -s 10.0.0.0/24 -j KUBE-MARK-MASQ
-A KUBE-SERVICES -m comment --comment "ns1/svc1: cluster IP" -m tcp -p tcp -d 172.20.1.1/32 --dport 0 -j KUBE-SVC-AHZNAGK3SCETOS2T
-A KUBE-SVC-AHZNAGK3SCETOS2T -m comment --comment ns1/svc1: -m statistic --mode random --probability 0.3333333333 -j KUBE-SEP-PXD6POUVGD2I37UY
-A KUBE-SEP-PXD6POUVGD2I37UY -m comment --comment ns1/svc1: -s 10.0.1.1/32 -j KUBE-MARK-MASQ
-A KUBE-SEP-PXD6POUVGD2I37UY -m comment --comment ns1/svc1: -m tcp -p tcp -j DNAT --to-destination 10.0.1.1:80
-A KUBE-SVC-AHZNAGK3SCETOS2T -m comment --comment ns1/svc1: -m statistic --mode random --probability 0.5000000000 -j KUBE-SEP-SOKZUIT7SCEVIP33
-A KUBE-SEP-SOKZUIT7SCEVIP33 -m comment --comment ns1/svc1: -s 10.0.1.2/32 -j KUBE-MARK-MASQ
-A KUBE-SEP-SOKZUIT7SCEVIP33 -m comment --comment ns1/svc1: -m tcp -p tcp -j DNAT --to-destination 10.0.1.2:80
-A KUBE-SVC-AHZNAGK3SCETOS2T -m comment --comment ns1/svc1: -j KUBE-SEP-WVE3FAB34S7NZGDJ
-A KUBE-SEP-WVE3FAB34S7NZGDJ -m comment --comment ns1/svc1: -s 10.0.1.3/32 -j KUBE-MARK-MASQ
-A KUBE-SEP-WVE3FAB34S7NZGDJ -m comment --comment ns1/svc1: -m tcp -p tcp -j DNAT --to-destination 10.0.1.3:80
-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
`

	ipt := iptablestest.NewFake()
	fp := NewFakeProxier(ipt, true)
	fp.OnServiceSynced()
	fp.OnEndpointsSynced()
	fp.OnEndpointSlicesSynced()

	serviceName := "svc1"
	namespaceName := "ns1"

	fp.OnServiceAdd(&v1.Service{
		ObjectMeta: metav1.ObjectMeta{Name: serviceName, Namespace: namespaceName},
		Spec: v1.ServiceSpec{
			ClusterIP: "172.20.1.1",
			Selector:  map[string]string{"foo": "bar"},
			Ports:     []v1.ServicePort{{Name: "", TargetPort: intstr.FromInt(80), Protocol: v1.ProtocolTCP}},
		},
	})

	tcpProtocol := v1.ProtocolTCP
	endpointSlice := &discovery.EndpointSlice{
		ObjectMeta: metav1.ObjectMeta{
			Name:      fmt.Sprintf("%s-1", serviceName),
			Namespace: namespaceName,
			Labels:    map[string]string{discovery.LabelServiceName: serviceName},
		},
		Ports: []discovery.EndpointPort{{
			Name:     utilpointer.StringPtr(""),
			Port:     utilpointer.Int32Ptr(80),
			Protocol: &tcpProtocol,
		}},
		AddressType: discovery.AddressTypeIPv4,
		Endpoints: []discovery.Endpoint{{
			Addresses:  []string{"10.0.1.1"},
			Conditions: discovery.EndpointConditions{Ready: utilpointer.BoolPtr(true)},
			Topology:   map[string]string{"kubernetes.io/hostname": testHostname},
		}, {
			Addresses:  []string{"10.0.1.2"},
			Conditions: discovery.EndpointConditions{Ready: utilpointer.BoolPtr(true)},
			Topology:   map[string]string{"kubernetes.io/hostname": "node2"},
		}, {
			Addresses:  []string{"10.0.1.3"},
			Conditions: discovery.EndpointConditions{Ready: utilpointer.BoolPtr(true)},
			Topology:   map[string]string{"kubernetes.io/hostname": "node3"},
		}},
	}

	fp.OnEndpointSliceAdd(endpointSlice)
	fp.syncProxyRules()
	assert.Equal(t, expectedIPTablesWithSlice, fp.iptablesData.String())

	fp.OnEndpointSliceDelete(endpointSlice)
	fp.syncProxyRules()
	assert.NotEqual(t, expectedIPTablesWithSlice, fp.iptablesData.String())
}

// TODO(thockin): add *more* tests for syncProxyRules() or break it down further and test the pieces.
