/
Services.go
1713 lines (1436 loc) · 65.3 KB
/
Services.go
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// Copyright 2017-2020 Authors of Cilium
//
// 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 k8sTest
import (
"context"
"fmt"
"net"
"strconv"
"strings"
"sync"
"time"
. "github.com/cilium/cilium/test/ginkgo-ext"
"github.com/cilium/cilium/test/helpers"
"github.com/asaskevich/govalidator"
. "github.com/onsi/gomega"
v1 "k8s.io/api/core/v1"
)
var _ = Describe("K8sServicesTest", func() {
const (
serviceName = "app1-service"
testDSClient = "zgroup=testDSClient"
testDS = "zgroup=testDS"
testDSK8s2 = "zgroup=test-k8s2"
echoServiceName = "echo"
echoPodLabel = "name=echo"
)
var (
kubectl *helpers.Kubectl
ciliumFilename string
backgroundCancel context.CancelFunc = func() {}
backgroundError error
enableBackgroundReport = true
k8s1NodeName string
k8s2NodeName string
outsideNodeName string
k8s1IP string
k8s2IP string
outsideIP string
)
applyPolicy := func(path string) {
By(fmt.Sprintf("Applying policy %s", path))
_, err := kubectl.CiliumPolicyAction(helpers.DefaultNamespace, path, helpers.KubectlApply, helpers.HelperTimeout)
ExpectWithOffset(1, err).Should(BeNil(), fmt.Sprintf("Error creating resource %s: %s", path, err))
}
BeforeAll(func() {
kubectl = helpers.CreateKubectl(helpers.K8s1VMName(), logger)
k8s1NodeName, k8s1IP = kubectl.GetNodeInfo(helpers.K8s1)
k8s2NodeName, k8s2IP = kubectl.GetNodeInfo(helpers.K8s2)
if helpers.ExistNodeWithoutCilium() {
outsideNodeName, outsideIP = kubectl.GetNodeInfo(helpers.GetNodeWithoutCilium())
}
ciliumFilename = helpers.TimestampFilename("cilium.yaml")
DeployCiliumAndDNS(kubectl, ciliumFilename)
})
AfterFailed(func() {
kubectl.CiliumReport(helpers.CiliumNamespace,
"cilium service list",
"cilium endpoint list")
})
JustBeforeEach(func() {
if enableBackgroundReport {
backgroundCancel, backgroundError = kubectl.BackgroundReport("uptime")
Expect(backgroundError).To(BeNil(), "Cannot start background report process")
}
})
JustAfterEach(func() {
kubectl.ValidateNoErrorsInLogs(CurrentGinkgoTestDescription().Duration)
backgroundCancel()
})
AfterEach(func() {
ExpectAllPodsTerminated(kubectl)
})
AfterAll(func() {
kubectl.CloseSSHClient()
})
ciliumIPv6Backends := func(label string, port string) (backends []string) {
ciliumPods, err := kubectl.GetCiliumPods(helpers.CiliumNamespace)
Expect(err).To(BeNil(), "Cannot get cilium pods")
for _, pod := range ciliumPods {
endpointIPs := kubectl.CiliumEndpointIPv6(pod, label)
for _, ip := range endpointIPs {
backends = append(backends, net.JoinHostPort(ip, port))
}
}
ExpectWithOffset(1, backends).To(Not(BeEmpty()), "Cannot find any IPv6 backends")
return backends
}
ciliumAddService := func(id int64, frontend string, backends []string, svcType, trafficPolicy string) {
ciliumPods, err := kubectl.GetCiliumPods(helpers.CiliumNamespace)
ExpectWithOffset(1, err).To(BeNil(), "Cannot get cilium pods")
for _, pod := range ciliumPods {
err := kubectl.CiliumServiceAdd(pod, id, frontend, backends, svcType, trafficPolicy)
ExpectWithOffset(1, err).To(BeNil(), "Failed to add cilium service")
}
}
ciliumDelService := func(id int64) {
ciliumPods, err := kubectl.GetCiliumPods(helpers.CiliumNamespace)
ExpectWithOffset(1, err).To(BeNil(), "Cannot get cilium pods")
for _, pod := range ciliumPods {
// ignore result so tear down still continues on failures
_ = kubectl.CiliumServiceDel(pod, id)
}
}
testCurlFromPods := func(clientPodLabel, url string) {
// A DS with client is running in each node. So we try from each node
// that can connect to the service. To make sure that the cross-node
// service connectivity is correct we tried 10 times, so balance in the
// two nodes
pods, err := kubectl.GetPodNames(helpers.DefaultNamespace, clientPodLabel)
ExpectWithOffset(1, err).Should(BeNil(), "cannot retrieve pod names by filter %q", testDSClient)
count := 10
cmd := fmt.Sprintf(`/bin/sh -c 'set -e; for i in $(seq 1 %d); do %s; done'`, count, helpers.CurlFailNoStats(url))
for _, pod := range pods {
By("Making %d curl requests from %s pod to service %s", count, pod, url)
res := kubectl.ExecPodCmd(helpers.DefaultNamespace, pod, cmd)
ExpectWithOffset(1, res).Should(helpers.CMDSuccess(), "Request from %s pod to service %s failed", pod, url)
}
}
testCurlFromPodsFail := func(clientPodLabel, url string) {
pods, err := kubectl.GetPodNames(helpers.DefaultNamespace, clientPodLabel)
ExpectWithOffset(1, err).Should(BeNil(), "cannot retrieve pod names by filter %q", testDSClient)
for _, pod := range pods {
res := kubectl.ExecPodCmd(
helpers.DefaultNamespace, pod,
helpers.CurlFail(url))
ExpectWithOffset(1, res).ShouldNot(helpers.CMDSuccess(),
"Pod %q can unexpectedly connect to service %q", pod, url)
}
}
waitPodsDs := func() {
groups := []string{testDS, testDSClient, testDSK8s2}
for _, pod := range groups {
err := kubectl.WaitforPods(helpers.DefaultNamespace, fmt.Sprintf("-l %s", pod), helpers.HelperTimeout)
ExpectWithOffset(1, err).Should(BeNil())
}
}
Context("Checks ClusterIP Connectivity", func() {
var (
demoYAML string
echoSVCYAML string
)
BeforeAll(func() {
demoYAML = helpers.ManifestGet(kubectl.BasePath(), "demo.yaml")
echoSVCYAML = helpers.ManifestGet(kubectl.BasePath(), "echo-svc.yaml")
res := kubectl.ApplyDefault(demoYAML)
res.ExpectSuccess("unable to apply %s", demoYAML)
res = kubectl.ApplyDefault(echoSVCYAML)
res.ExpectSuccess("unable to apply %s", echoSVCYAML)
err := kubectl.WaitforPods(helpers.DefaultNamespace, "-l zgroup=testapp", helpers.HelperTimeout)
Expect(err).Should(BeNil())
err = kubectl.WaitforPods(helpers.DefaultNamespace, "-l id=app1", helpers.HelperTimeout)
Expect(err).Should(BeNil())
err = kubectl.WaitforPods(helpers.DefaultNamespace, "-l name=echo", helpers.HelperTimeout)
Expect(err).Should(BeNil())
})
AfterAll(func() {
// Explicitly ignore result of deletion of resources to avoid incomplete
// teardown if any step fails.
_ = kubectl.Delete(demoYAML)
_ = kubectl.Delete(echoSVCYAML)
})
SkipItIf(helpers.RunsWithoutKubeProxy, "Checks service on same node", func() {
clusterIP, _, err := kubectl.GetServiceHostPort(helpers.DefaultNamespace, serviceName)
Expect(err).Should(BeNil(), "Cannot get service %s", serviceName)
Expect(govalidator.IsIP(clusterIP)).Should(BeTrue(), "ClusterIP is not an IP")
By("testing connectivity via cluster IP %s", clusterIP)
ciliumPodK8s1, err := kubectl.GetCiliumPodOnNodeWithLabel(helpers.CiliumNamespace, helpers.K8s1)
Expect(err).Should(BeNil(), "Cannot get cilium pod on k8s1")
monitorRes, monitorCancel := kubectl.MonitorStart(helpers.CiliumNamespace, ciliumPodK8s1)
defer func() {
monitorCancel()
helpers.WriteToReportFile(monitorRes.CombineOutput().Bytes(), "cluster-ip-same-node.log")
}()
httpSVCURL := fmt.Sprintf("http://%s/", clusterIP)
tftpSVCURL := fmt.Sprintf("tftp://%s/hello", clusterIP)
status, err := kubectl.ExecInHostNetNS(context.TODO(), k8s1NodeName,
helpers.CurlFail(httpSVCURL))
Expect(err).To(BeNil(), "Cannot run curl in host netns")
status.ExpectSuccess("cannot curl to service IP from host")
status, err = kubectl.ExecInHostNetNS(context.TODO(), k8s1NodeName,
helpers.CurlFail(tftpSVCURL))
Expect(err).To(BeNil(), "Cannot run curl in host netns")
status.ExpectSuccess("cannot curl to service IP from host")
ciliumPods, err := kubectl.GetCiliumPods(helpers.CiliumNamespace)
Expect(err).To(BeNil(), "Cannot get cilium pods")
for _, pod := range ciliumPods {
service := kubectl.CiliumExecMustSucceed(context.TODO(), pod, "cilium service list", "Cannot retrieve services on cilium Pod")
service.ExpectContains(clusterIP, "ClusterIP is not present in the cilium service list")
}
for i := 0; i < 10; i++ {
// Send requests from "app2" pod which runs on the same node as
// "app1" pods
testCurlFromPods("id=app2", httpSVCURL)
testCurlFromPods("id=app2", tftpSVCURL)
}
})
It("Checks service accessing itself (hairpin flow)", func() {
clusterIP, _, err := kubectl.GetServiceHostPort(helpers.DefaultNamespace, echoServiceName)
Expect(err).Should(BeNil(), "Cannot get service %q ClusterIP", echoServiceName)
Expect(govalidator.IsIP(clusterIP)).Should(BeTrue(), "ClusterIP is not an IP")
url := fmt.Sprintf("http://%s/", clusterIP)
testCurlFromPods(echoPodLabel, url)
url = fmt.Sprintf("tftp://%s/hello", clusterIP)
testCurlFromPods(echoPodLabel, url)
}, 300)
SkipContextIf(helpers.RunsWithKubeProxy, "IPv6 Connectivity", func() {
// Because the deployed K8s does not have dual-stack mode enabled,
// we install the Cilium service rules manually via Cilium CLI.
demoClusterIPv6 := "fd03::100"
echoClusterIPv6 := "fd03::200"
BeforeAll(func() {
// Installs the IPv6 equivalent of app1-service (demo.yaml)
httpBackends := ciliumIPv6Backends("-l k8s:id=app1,k8s:io.kubernetes.pod.namespace=default", "80")
ciliumAddService(10080, net.JoinHostPort(demoClusterIPv6, "80"), httpBackends, "ClusterIP", "Cluster")
tftpBackends := ciliumIPv6Backends("-l k8s:id=app1,k8s:io.kubernetes.pod.namespace=default", "69")
ciliumAddService(10069, net.JoinHostPort(demoClusterIPv6, "69"), tftpBackends, "ClusterIP", "Cluster")
// Installs the IPv6 equivalent of echo (echo-svc.yaml)
httpBackends = ciliumIPv6Backends("-l k8s:name=echo,k8s:io.kubernetes.pod.namespace=default", "80")
ciliumAddService(20080, net.JoinHostPort(echoClusterIPv6, "80"), httpBackends, "ClusterIP", "Cluster")
tftpBackends = ciliumIPv6Backends("-l k8s:name=echo,k8s:io.kubernetes.pod.namespace=default", "69")
ciliumAddService(20069, net.JoinHostPort(echoClusterIPv6, "69"), tftpBackends, "ClusterIP", "Cluster")
})
AfterAll(func() {
ciliumDelService(10080)
ciliumDelService(10069)
ciliumDelService(20080)
ciliumDelService(20069)
})
It("Checks service on same node", func() {
status, err := kubectl.ExecInHostNetNS(context.TODO(), k8s1NodeName,
helpers.CurlFail(`"http://[%s]/"`, demoClusterIPv6))
Expect(err).To(BeNil(), "Cannot run curl in host netns")
status.ExpectSuccess("cannot curl to service IP from host")
status, err = kubectl.ExecInHostNetNS(context.TODO(), k8s1NodeName,
helpers.CurlFail(`"tftp://[%s]/hello"`, demoClusterIPv6))
Expect(err).To(BeNil(), "Cannot run curl in host netns")
status.ExpectSuccess("cannot curl to service IP from host")
})
It("Checks service accessing itself (hairpin flow)", func() {
url := fmt.Sprintf(`"http://[%s]/"`, echoClusterIPv6)
testCurlFromPods(echoPodLabel, url)
url = fmt.Sprintf(`"tftp://[%s]/hello"`, echoClusterIPv6)
testCurlFromPods(echoPodLabel, url)
})
})
})
Context("Checks service across nodes", func() {
var (
demoYAML string
)
BeforeAll(func() {
demoYAML = helpers.ManifestGet(kubectl.BasePath(), "demo_ds.yaml")
res := kubectl.ApplyDefault(demoYAML)
res.ExpectSuccess("Unable to apply %s", demoYAML)
waitPodsDs()
})
AfterAll(func() {
// Explicitly ignore result of deletion of resources to avoid incomplete
// teardown if any step fails.
_ = kubectl.Delete(demoYAML)
ExpectAllPodsTerminated(kubectl)
})
SkipItIf(helpers.RunsWithoutKubeProxy, "Checks ClusterIP Connectivity", func() {
service := "testds-service"
clusterIP, _, err := kubectl.GetServiceHostPort(helpers.DefaultNamespace, service)
Expect(err).Should(BeNil(), "Cannot get service %s", service)
Expect(govalidator.IsIP(clusterIP)).Should(BeTrue(), "ClusterIP is not an IP")
url := fmt.Sprintf("http://%s/", clusterIP)
testCurlFromPods(testDSClient, url)
url = fmt.Sprintf("tftp://%s/hello", clusterIP)
testCurlFromPods(testDSClient, url)
})
SkipContextIf(helpers.RunsWithKubeProxy, "IPv6 Connectivity", func() {
testDSIPv6 := "fd03::310"
BeforeAll(func() {
// Install rules for testds-service (demo_ds.yaml)
httpBackends := ciliumIPv6Backends("-l k8s:zgroup=testDS,k8s:io.kubernetes.pod.namespace=default", "80")
ciliumAddService(31080, net.JoinHostPort(testDSIPv6, "80"), httpBackends, "ClusterIP", "Cluster")
tftpBackends := ciliumIPv6Backends("-l k8s:zgroup=testDS,k8s:io.kubernetes.pod.namespace=default", "69")
ciliumAddService(31069, net.JoinHostPort(testDSIPv6, "69"), tftpBackends, "ClusterIP", "Cluster")
})
AfterAll(func() {
ciliumDelService(31080)
ciliumDelService(31069)
})
It("Checks ClusterIP Connectivity", func() {
url := fmt.Sprintf(`"http://[%s]/"`, testDSIPv6)
testCurlFromPods(testDSClient, url)
url = fmt.Sprintf(`"tftp://[%s]/hello"`, testDSIPv6)
testCurlFromPods(testDSClient, url)
})
})
getHTTPLink := func(host string, port int32) string {
return fmt.Sprintf("http://%s",
net.JoinHostPort(host, fmt.Sprintf("%d", port)))
}
getTFTPLink := func(host string, port int32) string {
// TFTP requires a filename. Otherwise the packet will be
// silently dropped by the server.
return fmt.Sprintf("tftp://%s/hello",
net.JoinHostPort(host, fmt.Sprintf("%d", port)))
}
testCurlFromPodInHostNetNS := func(url string, count int, fromPod string) {
By("Making %d curl requests from pod (host netns) %s to %q", count, fromPod, url)
cmd := fmt.Sprintf(`/bin/sh -c 'set -e; for i in $(seq 1 %d); do %s; done'`, count,
helpers.CurlFailNoStats(url))
res, err := kubectl.ExecInHostNetNS(context.TODO(), fromPod, cmd)
ExpectWithOffset(1, err).To(BeNil(), "Cannot run curl in host netns")
ExpectWithOffset(1, res).Should(helpers.CMDSuccess(),
"Request from %s to service %s failed", fromPod, url)
}
testCurlFailFromPodInHostNetNS := func(url string, count int, fromPod string) {
By("Making %d curl requests from %s to %q", count, fromPod, url)
for i := 1; i <= count; i++ {
res, err := kubectl.ExecInHostNetNS(context.TODO(), fromPod, helpers.CurlFail(url, "--max-time 3"))
ExpectWithOffset(1, err).To(BeNil(), "Cannot run curl in host netns")
ExpectWithOffset(1, res).ShouldNot(helpers.CMDSuccess(),
"%s host unexpectedly connected to service %q, it should fail", fromPod, url)
}
}
failBind := func(addr string, port int32, proto, fromPod string) {
By("Trying to bind NodePort addr %q:%d on %s", addr, port, fromPod)
res, err := kubectl.ExecInHostNetNS(context.TODO(), fromPod,
helpers.PythonBind(addr, uint16(port), proto))
ExpectWithOffset(2, err).To(BeNil(), "Cannot run python in host netns")
ExpectWithOffset(2, res).ShouldNot(helpers.CMDSuccess(),
"%s host unexpectedly was able to bind on %q:%d, it should fail", fromPod, addr, port)
}
testCurlFromPodInHostNetNSExpectingHTTPCode := func(url string, count int, expectedCode string, fromPod string) {
By("Making %d HTTP requests from %s to %q, expecting HTTP %s", count, fromPod, url, expectedCode)
for i := 1; i <= count; i++ {
res, err := kubectl.ExecInHostNetNS(context.TODO(), fromPod, helpers.CurlWithHTTPCode(url))
ExpectWithOffset(1, err).To(BeNil(), "Cannot run curl in host netns")
ExpectWithOffset(1, res).Should(helpers.CMDSuccess(),
"%s host can not connect to service %q", fromPod, url)
res.ExpectContains(expectedCode, "Request from %s to %q returned HTTP Code %q, expected %q",
fromPod, url, res.Output(), expectedCode)
}
}
testCurlFromOutsideWithLocalPort :=
func(url string, count int, checkSourceIP bool, fromPort int) {
var cmd string
By("Making %d HTTP requests from outside cluster to %q", count, url)
for i := 1; i <= count; i++ {
if fromPort == 0 {
cmd = helpers.CurlFail(url)
} else {
cmd = helpers.CurlFail("--local-port %d %s", fromPort, url)
}
if checkSourceIP {
cmd += " | grep client_address="
}
res, err := kubectl.ExecInHostNetNS(context.TODO(), outsideNodeName, cmd)
ExpectWithOffset(1, err).Should(BeNil(), "Cannot exec in k8s3 host netns")
ExpectWithOffset(1, res).Should(helpers.CMDSuccess(),
"Can not connect to service %q from outside cluster", url)
if checkSourceIP {
// Parse the IPs to avoid issues with 4-in-6 formats
sourceIP := net.ParseIP(strings.TrimSpace(strings.Split(res.GetStdOut(), "=")[1]))
outsideIP := net.ParseIP(outsideIP)
ExpectWithOffset(1, sourceIP).To(Equal(outsideIP))
}
}
}
testCurlFromOutside := func(url string, count int, checkSourceIP bool) {
testCurlFromOutsideWithLocalPort(url, count, checkSourceIP, 0)
}
// srcPod: Name of pod sending the datagram
// srcPort: Source UDP port
// dstPodIP: Receiver pod IP (for checking in CT table)
// dstPodPort: Receiver pod port (for checking in CT table)
// dstIP: Target endpoint IP for sending the datagram
// dstPort: Target endpoint port for sending the datagram
// kubeProxy: True if kube-proxy is enabled
doFragmentedRequest := func(srcPod string, srcPort, dstPodPort int, dstIP string, dstPort int32, kubeProxy bool) {
var (
blockSize = 5120
blockCount = 1
)
ciliumPodK8s1, err := kubectl.GetCiliumPodOnNode(helpers.CiliumNamespace, helpers.K8s1)
ExpectWithOffset(2, err).Should(BeNil(), "Cannot get cilium pod on k8s1")
ciliumPodK8s2, err := kubectl.GetCiliumPodOnNode(helpers.CiliumNamespace, helpers.K8s2)
ExpectWithOffset(2, err).Should(BeNil(), "Cannot get cilium pod on k8s2")
_, dstPodIPK8s1 := kubectl.GetPodOnNodeWithOffset(helpers.K8s1, testDS, 1)
_, dstPodIPK8s2 := kubectl.GetPodOnNodeWithOffset(helpers.K8s2, testDS, 1)
// Get initial number of packets for the flow we test
// from conntrack table. The flow is probably not in
// the table the first time we check, so do not stop if
// Atoi() throws an error and simply consider we have 0
// packets.
// Field #7 is "RxPackets=<n>"
cmdIn := "cilium bpf ct list global | awk '/%s/ { sub(\".*=\",\"\", $7); print $7 }'"
endpointK8s1 := fmt.Sprintf("%s:%d", dstPodIPK8s1, dstPodPort)
patternInK8s1 := fmt.Sprintf("UDP IN [^:]+:%d -> %s", srcPort, endpointK8s1)
cmdInK8s1 := fmt.Sprintf(cmdIn, patternInK8s1)
res := kubectl.CiliumExecMustSucceed(context.TODO(), ciliumPodK8s1, cmdInK8s1)
countInK8s1, _ := strconv.Atoi(strings.TrimSpace(res.GetStdOut()))
endpointK8s2 := fmt.Sprintf("%s:%d", dstPodIPK8s2, dstPodPort)
patternInK8s2 := fmt.Sprintf("UDP IN [^:]+:%d -> %s", srcPort, endpointK8s2)
cmdInK8s2 := fmt.Sprintf(cmdIn, patternInK8s2)
res = kubectl.CiliumExecMustSucceed(context.TODO(), ciliumPodK8s2, cmdInK8s2)
countInK8s2, _ := strconv.Atoi(strings.TrimSpace(res.GetStdOut()))
// Field #11 is "TxPackets=<n>"
cmdOut := "cilium bpf ct list global | awk '/%s/ { sub(\".*=\",\"\", $11); print $11 }'"
if kubeProxy {
// If kube-proxy is enabled, we see packets in ctmap with the
// service's IP address and port, not backend's.
dstIPv4 := strings.Replace(dstIP, "::ffff:", "", 1)
endpointK8s1 = fmt.Sprintf("%s:%d", dstIPv4, dstPort)
endpointK8s2 = endpointK8s1
}
patternOutK8s1 := fmt.Sprintf("UDP OUT [^:]+:%d -> %s", srcPort, endpointK8s1)
cmdOutK8s1 := fmt.Sprintf(cmdOut, patternOutK8s1)
res = kubectl.CiliumExecMustSucceed(context.TODO(), ciliumPodK8s1, cmdOutK8s1)
countOutK8s1, _ := strconv.Atoi(strings.TrimSpace(res.GetStdOut()))
// If kube-proxy is enabled, the two commands are the same and
// there's no point executing it twice.
countOutK8s2 := 0
patternOutK8s2 := fmt.Sprintf("UDP OUT [^:]+:%d -> %s", srcPort, endpointK8s2)
cmdOutK8s2 := fmt.Sprintf(cmdOut, patternOutK8s2)
if !kubeProxy {
res = kubectl.CiliumExecMustSucceed(context.TODO(), ciliumPodK8s1, cmdOutK8s2)
countOutK8s2, _ = strconv.Atoi(strings.TrimSpace(res.GetStdOut()))
}
// Send datagram
By("Sending a fragmented packet from %s to endpoint %s:%d", srcPod, dstIP, dstPort)
cmd := fmt.Sprintf("bash -c 'dd if=/dev/zero bs=%d count=%d | nc -u -w 1 -p %d %s %d'", blockSize, blockCount, srcPort, dstIP, dstPort)
res = kubectl.ExecPodCmd(helpers.DefaultNamespace, srcPod, cmd)
res.ExpectSuccess("Cannot send fragmented datagram: %s", res.CombineOutput())
// Let's compute the expected number of packets. First
// fragment holds 1416 bytes of data under standard
// conditions for temperature, pressure and MTU.
// Following ones do not have UDP header: up to 1424
// bytes of data.
delta := 1
if blockSize*blockCount >= 1416 {
delta += (blockSize*blockCount - 1416) / 1424
if (blockSize*blockCount-1416)%1424 != 0 {
delta++
}
}
// Check that the expected packets were processed
// Because of load balancing we do not know what
// backend pod received the datagram, so we check for
// each node.
res = kubectl.CiliumExecMustSucceed(context.TODO(), ciliumPodK8s1, cmdInK8s1)
newCountInK8s1, _ := strconv.Atoi(strings.TrimSpace(res.GetStdOut()))
res = kubectl.CiliumExecMustSucceed(context.TODO(), ciliumPodK8s2, cmdInK8s2)
newCountInK8s2, _ := strconv.Atoi(strings.TrimSpace(res.GetStdOut()))
ExpectWithOffset(2, []int{newCountInK8s1, newCountInK8s2}).To(SatisfyAny(
Equal([]int{countInK8s1, countInK8s2 + delta}),
Equal([]int{countInK8s1 + delta, countInK8s2}),
), "Failed to account for IPv4 fragments to %s (in)", dstIP)
res = kubectl.CiliumExecMustSucceed(context.TODO(), ciliumPodK8s1, cmdOutK8s1)
newCountOutK8s1, _ := strconv.Atoi(strings.TrimSpace(res.GetStdOut()))
// If kube-proxy is enabled, the two commands are the same and
// there's no point executing it twice.
newCountOutK8s2 := 0
if !kubeProxy {
res = kubectl.CiliumExecMustSucceed(context.TODO(), ciliumPodK8s1, cmdOutK8s2)
newCountOutK8s2, _ = strconv.Atoi(strings.TrimSpace(res.GetStdOut()))
}
ExpectWithOffset(2, []int{newCountOutK8s1, newCountOutK8s2}).To(SatisfyAny(
Equal([]int{countOutK8s1, countOutK8s2 + delta}),
Equal([]int{countOutK8s1 + delta, countOutK8s2}),
), "Failed to account for IPv4 fragments to %s (out)", dstIP)
}
getIPv4Andv6AddrForIface := func(nodeName, iface string) (string, string) {
cmd := fmt.Sprintf("ip -4 -o a s dev %s scope global | awk '{print $4}' | cut -d/ -f1", iface)
res, err := kubectl.ExecInHostNetNS(context.TODO(), nodeName, cmd)
ExpectWithOffset(2, err).To(BeNil(), cmd)
res.ExpectSuccess(cmd)
ipv4 := strings.Trim(res.GetStdOut(), "\n")
cmd = fmt.Sprintf("ip -6 -o a s dev %s scope global | awk '{print $4}' | cut -d/ -f1", iface)
res, err = kubectl.ExecInHostNetNS(context.TODO(), nodeName, cmd)
ExpectWithOffset(2, err).To(BeNil(), cmd)
res.ExpectSuccess(cmd)
ipv6 := strings.Trim(res.GetStdOut(), "\n")
return ipv4, ipv6
}
testNodePort := func(bpfNodePort, testSecondaryNodePortIP, testFromOutside bool) {
var (
err error
data v1.Service
wg sync.WaitGroup
secondaryK8s1IPv4, secondaryK8s2IPv4 string
)
err = kubectl.Get(helpers.DefaultNamespace, "service test-nodeport").Unmarshal(&data)
ExpectWithOffset(1, err).Should(BeNil(), "Can not retrieve service")
// These are going to be tested from pods running in their own net namespaces
testURLsFromPods := []string{
getHTTPLink(data.Spec.ClusterIP, data.Spec.Ports[0].Port),
getTFTPLink(data.Spec.ClusterIP, data.Spec.Ports[1].Port),
getHTTPLink(k8s1IP, data.Spec.Ports[0].NodePort),
getTFTPLink(k8s1IP, data.Spec.Ports[1].NodePort),
getHTTPLink("::ffff:"+k8s1IP, data.Spec.Ports[0].NodePort),
getTFTPLink("::ffff:"+k8s1IP, data.Spec.Ports[1].NodePort),
getHTTPLink(k8s2IP, data.Spec.Ports[0].NodePort),
getTFTPLink(k8s2IP, data.Spec.Ports[1].NodePort),
getHTTPLink("::ffff:"+k8s2IP, data.Spec.Ports[0].NodePort),
getTFTPLink("::ffff:"+k8s2IP, data.Spec.Ports[1].NodePort),
}
// There are tested from pods running in the host net namespace
testURLsFromHosts := []string{
getHTTPLink(data.Spec.ClusterIP, data.Spec.Ports[0].Port),
getTFTPLink(data.Spec.ClusterIP, data.Spec.Ports[1].Port),
getHTTPLink("127.0.0.1", data.Spec.Ports[0].NodePort),
getTFTPLink("127.0.0.1", data.Spec.Ports[1].NodePort),
getHTTPLink("::ffff:127.0.0.1", data.Spec.Ports[0].NodePort),
getTFTPLink("::ffff:127.0.0.1", data.Spec.Ports[1].NodePort),
getHTTPLink(k8s1IP, data.Spec.Ports[0].NodePort),
getTFTPLink(k8s1IP, data.Spec.Ports[1].NodePort),
getHTTPLink("::ffff:"+k8s1IP, data.Spec.Ports[0].NodePort),
getTFTPLink("::ffff:"+k8s1IP, data.Spec.Ports[1].NodePort),
getHTTPLink(k8s2IP, data.Spec.Ports[0].NodePort),
getTFTPLink(k8s2IP, data.Spec.Ports[1].NodePort),
getHTTPLink("::ffff:"+k8s2IP, data.Spec.Ports[0].NodePort),
getTFTPLink("::ffff:"+k8s2IP, data.Spec.Ports[1].NodePort),
}
if testSecondaryNodePortIP {
secondaryK8s1IPv4, _ = getIPv4Andv6AddrForIface(k8s1NodeName, helpers.SecondaryIface)
secondaryK8s2IPv4, _ = getIPv4Andv6AddrForIface(k8s2NodeName, helpers.SecondaryIface)
testURLsFromHosts = append(testURLsFromHosts, []string{
getHTTPLink(secondaryK8s1IPv4, data.Spec.Ports[0].NodePort),
getTFTPLink(secondaryK8s1IPv4, data.Spec.Ports[1].NodePort),
getHTTPLink(secondaryK8s2IPv4, data.Spec.Ports[0].NodePort),
getTFTPLink(secondaryK8s2IPv4, data.Spec.Ports[1].NodePort),
}...)
}
testURLsFromOutside := []string{}
if testFromOutside {
// These are tested from external node which does not run
// cilium-agent (so it's not a subject to bpf_sock)
testURLsFromOutside = []string{
getHTTPLink(k8s1IP, data.Spec.Ports[0].NodePort),
getTFTPLink(k8s1IP, data.Spec.Ports[1].NodePort),
getHTTPLink(k8s2IP, data.Spec.Ports[0].NodePort),
getTFTPLink(k8s2IP, data.Spec.Ports[1].NodePort),
}
if testSecondaryNodePortIP {
testURLsFromOutside = append(testURLsFromOutside, []string{
getHTTPLink(secondaryK8s1IPv4, data.Spec.Ports[0].NodePort),
getTFTPLink(secondaryK8s1IPv4, data.Spec.Ports[1].NodePort),
getHTTPLink(secondaryK8s2IPv4, data.Spec.Ports[0].NodePort),
getTFTPLink(secondaryK8s2IPv4, data.Spec.Ports[1].NodePort),
}...)
}
}
count := 10
for _, url := range testURLsFromPods {
wg.Add(1)
go func(url string) {
defer GinkgoRecover()
defer wg.Done()
testCurlFromPods(testDSClient, url)
}(url)
}
for _, url := range testURLsFromHosts {
wg.Add(1)
go func(url string) {
defer GinkgoRecover()
defer wg.Done()
testCurlFromPodInHostNetNS(url, count, k8s1NodeName)
}(url)
}
for _, url := range testURLsFromOutside {
wg.Add(1)
go func(url string) {
defer GinkgoRecover()
defer wg.Done()
testCurlFromOutside(url, count, false)
}(url)
}
// TODO: IPv6
if bpfNodePort {
httpURL := getHTTPLink("127.0.0.1", data.Spec.Ports[0].NodePort)
tftpURL := getTFTPLink("127.0.0.1", data.Spec.Ports[1].NodePort)
testCurlFromPodsFail(testDSClient, httpURL)
testCurlFromPodsFail(testDSClient, tftpURL)
httpURL = getHTTPLink("::ffff:127.0.0.1", data.Spec.Ports[0].NodePort)
tftpURL = getTFTPLink("::ffff:127.0.0.1", data.Spec.Ports[1].NodePort)
testCurlFromPodsFail(testDSClient, httpURL)
testCurlFromPodsFail(testDSClient, tftpURL)
}
wg.Wait()
}
testExternalIPs := func() {
var data v1.Service
count := 10
err := kubectl.Get(helpers.DefaultNamespace, "service test-external-ips").Unmarshal(&data)
ExpectWithOffset(1, err).Should(BeNil(), "Can not retrieve service")
svcExternalIP := data.Spec.ExternalIPs[0]
// Append k8s1 IP addr to the external IPs for testing whether the svc
// can be reached from within a cluster via k8s1 IP addr
kubectl.Patch(helpers.DefaultNamespace, "service", "test-external-ips",
fmt.Sprintf(`{"spec":{"externalIPs":["%s","%s"]}}`, svcExternalIP, k8s1IP))
httpURL := getHTTPLink(svcExternalIP, data.Spec.Ports[0].Port)
tftpURL := getTFTPLink(svcExternalIP, data.Spec.Ports[1].Port)
// Add the route on the outside node to the external IP addr
cmd := fmt.Sprintf("ip r a %s/32 via %s", svcExternalIP, k8s1IP)
res, err := kubectl.ExecInHostNetNS(context.TODO(), outsideNodeName, cmd)
ExpectWithOffset(1, err).Should(BeNil(), "Cannot exec in outside node %s", outsideNodeName)
ExpectWithOffset(1, res).Should(helpers.CMDSuccess(),
"Can not exec %q on outside node %s", cmd, outsideNodeName)
defer func() {
cmd = fmt.Sprintf("ip r d %s/32 via %s", svcExternalIP, k8s1IP)
kubectl.ExecInHostNetNS(context.TODO(), outsideNodeName, cmd)
}()
// Should work from outside via the external IP
testCurlFromOutside(httpURL, count, false)
testCurlFromOutside(tftpURL, count, false)
// Same from inside a pod
testCurlFromPods(testDSClient, httpURL)
testCurlFromPods(testDSClient, tftpURL)
// But not from the host netns (to prevent MITM)
testCurlFailFromPodInHostNetNS(httpURL, 1, k8s1NodeName)
testCurlFailFromPodInHostNetNS(httpURL, 1, k8s1NodeName)
testCurlFailFromPodInHostNetNS(httpURL, 1, k8s2NodeName)
testCurlFailFromPodInHostNetNS(httpURL, 1, k8s2NodeName)
// However, it should work via the k8s1 IP addr
httpURL = getHTTPLink(k8s1IP, data.Spec.Ports[0].Port)
tftpURL = getTFTPLink(k8s1IP, data.Spec.Ports[1].Port)
testCurlFromPodInHostNetNS(httpURL, count, k8s1NodeName)
testCurlFromPodInHostNetNS(tftpURL, count, k8s1NodeName)
testCurlFromPods(testDSClient, httpURL)
testCurlFromPods(testDSClient, tftpURL)
}
testFailBind := func() {
var data v1.Service
err := kubectl.Get(helpers.DefaultNamespace, "service test-nodeport").Unmarshal(&data)
ExpectWithOffset(1, err).Should(BeNil(), "Can not retrieve service")
// Ensure the NodePort cannot be bound from any redirected address
failBind("127.0.0.1", data.Spec.Ports[0].NodePort, "tcp", k8s1NodeName)
failBind("127.0.0.1", data.Spec.Ports[1].NodePort, "udp", k8s1NodeName)
failBind("", data.Spec.Ports[0].NodePort, "tcp", k8s1NodeName)
failBind("", data.Spec.Ports[1].NodePort, "udp", k8s1NodeName)
failBind("::ffff:127.0.0.1", data.Spec.Ports[0].NodePort, "tcp", k8s1NodeName)
failBind("::ffff:127.0.0.1", data.Spec.Ports[1].NodePort, "udp", k8s1NodeName)
}
testNodePortExternal := func(checkTCP, checkUDP bool) {
var data v1.Service
err := kubectl.Get(helpers.DefaultNamespace, "service test-nodeport").Unmarshal(&data)
ExpectWithOffset(1, err).Should(BeNil(), "Cannot retrieve service")
httpURL := getHTTPLink(k8s1IP, data.Spec.Ports[0].NodePort)
tftpURL := getTFTPLink(k8s1IP, data.Spec.Ports[1].NodePort)
// Test from external connectivity
// Note:
// In case of SNAT checkSourceIP is false here since the HTTP request
// won't have the client IP but the service IP (given the request comes
// from the Cilium node to the backend, not from the client directly).
// Same in case of Hybrid mode for UDP.
testCurlFromOutside(httpURL, 10, checkTCP)
testCurlFromOutside(tftpURL, 10, checkUDP)
// Make sure all the rest works as expected as well
testNodePort(true, false, false)
// Clear CT tables on both Cilium nodes
pod, err := kubectl.GetCiliumPodOnNode(helpers.CiliumNamespace, helpers.K8s1)
ExpectWithOffset(1, err).Should(BeNil(), "Cannot determine cilium pod name")
kubectl.CiliumExecMustSucceed(context.TODO(), pod, "cilium bpf ct flush global", "Unable to flush CT maps")
pod, err = kubectl.GetCiliumPodOnNode(helpers.CiliumNamespace, helpers.K8s2)
ExpectWithOffset(1, err).Should(BeNil(), "Cannot determine cilium pod name")
kubectl.CiliumExecMustSucceed(context.TODO(), pod, "cilium bpf ct flush global", "Unable to flush CT maps")
}
// fromOutside=true tests session affinity implementation from lb.h, while
// fromOutside=false tests from bpf_sock.c.
testSessionAffinity := func(fromOutside, vxlan bool) {
var (
data v1.Service
dstPod string
count = 10
from string
err error
res *helpers.CmdRes
)
err = kubectl.Get(helpers.DefaultNamespace, "service test-affinity").Unmarshal(&data)
ExpectWithOffset(1, err).Should(BeNil(), "Cannot retrieve service")
httpURL := getHTTPLink(k8s1IP, data.Spec.Ports[0].NodePort)
cmd := helpers.CurlFail(httpURL) + " | grep 'Hostname:' " // pod name is in the hostname
if fromOutside {
from = outsideNodeName
} else {
pods, err := kubectl.GetPodNames(helpers.DefaultNamespace, testDSClient)
ExpectWithOffset(1, err).Should(BeNil(), "cannot retrieve pod names by filter %q", testDSClient)
from = pods[0]
}
// Send 10 requests to the test-affinity and check that the same backend is chosen
By("Making %d HTTP requests from %s to %q (sessionAffinity)", count, from, httpURL)
for i := 1; i <= count; i++ {
if fromOutside {
res, err = kubectl.ExecInHostNetNS(context.TODO(), from, cmd)
ExpectWithOffset(1, err).Should(BeNil(), "Cannot exec in %s host netns", from)
} else {
res = kubectl.ExecPodCmd(helpers.DefaultNamespace, from, cmd)
}
ExpectWithOffset(1, res).Should(helpers.CMDSuccess(),
"Cannot connect to service %q from %s (%d/%d)", httpURL, from, i, count)
pod := strings.TrimSpace(strings.Split(res.GetStdOut(), ": ")[1])
if i == 1 {
// Retrieve the destination pod from the first request
dstPod = pod
} else {
// Check that destination pod is always the same
ExpectWithOffset(1, dstPod).To(Equal(pod))
}
}
By("Removing %s pod so that another pod is chosen", dstPod)
// Delete the pod, and check that a new backend is chosen
kubectl.DeleteResource("pod", dstPod).ExpectSuccess("Unable to delete %s pod", dstPod)
// Wait until the replacement pod has been provisioned and appeared
// in the ipcache of the second node.
//
// The first wait should give enough time for cilium-agents to remove
// the deleted pod from the BPF LB maps, so that the next request won't
// choose the deleted pod.
waitPodsDs()
// The second wait is needed to make sure that an IPCache entry of the
// new pod appears on the k8s1 node. Otherwise, if the new pod runs
// on k8s2 and a request below selects it, the request will be dropped
// in the vxlan mode (the tailcall IPV4_NODEPORT_NAT body won't pass
// the request to the encap routines, and instead it will be dropped
// due to failing fib_lookup).
if fromOutside && vxlan {
podIPs, err := kubectl.GetPodsIPs(helpers.DefaultNamespace, testDS)
ExpectWithOffset(1, err).Should(BeNil(), "Cannot get pod IP addrs for -l %s pods", testDS)
for _, ipAddr := range podIPs {
err = kubectl.WaitForIPCacheEntry(k8s1NodeName, ipAddr)
ExpectWithOffset(1, err).Should(BeNil(), "Failed waiting for %s ipcache entry on k8s1", ipAddr)
}
}
for i := 1; i <= count; i++ {
if fromOutside {
res, err = kubectl.ExecInHostNetNS(context.TODO(), from, cmd)
ExpectWithOffset(1, err).Should(BeNil(), "Cannot exec in %s host netns", from)
} else {
res = kubectl.ExecPodCmd(helpers.DefaultNamespace, from, cmd)
}
ExpectWithOffset(1, res).Should(helpers.CMDSuccess(),
"Cannot connect to service %q from %s (%d/%d) after restart", httpURL, from, i, count)
pod := strings.TrimSpace(strings.Split(res.GetStdOut(), ": ")[1])
if i == 1 {
// Retrieve the destination pod from the first request
ExpectWithOffset(1, dstPod).ShouldNot(Equal(pod))
dstPod = pod
} else {
// Check that destination pod is always the same
ExpectWithOffset(1, dstPod).To(Equal(pod))
}
}
}
testExternalTrafficPolicyLocal := func() {
var (
data v1.Service
httpURL string
tftpURL string
)
// Checks requests are not SNATed when externalTrafficPolicy=Local
err := kubectl.Get(helpers.DefaultNamespace, "service test-nodeport-local").Unmarshal(&data)
ExpectWithOffset(1, err).Should(BeNil(), "Can not retrieve service")
count := 10
if helpers.ExistNodeWithoutCilium() {
httpURL = getHTTPLink(k8s1IP, data.Spec.Ports[0].NodePort)
tftpURL = getTFTPLink(k8s1IP, data.Spec.Ports[1].NodePort)
testCurlFromOutside(httpURL, count, true)
testCurlFromOutside(tftpURL, count, true)
} else {
GinkgoPrint("Skipping externalTrafficPolicy=Local test from external node")
}
// Checks that requests to k8s2 succeed, while requests to k8s1 are dropped
err = kubectl.Get(helpers.DefaultNamespace, "service test-nodeport-local-k8s2").Unmarshal(&data)
ExpectWithOffset(1, err).Should(BeNil(), "Can not retrieve service")
httpURL = getHTTPLink(k8s2IP, data.Spec.Ports[0].NodePort)
tftpURL = getTFTPLink(k8s2IP, data.Spec.Ports[1].NodePort)
testCurlFromPodInHostNetNS(httpURL, count, k8s1NodeName)
testCurlFromPodInHostNetNS(httpURL, count, k8s2NodeName)
testCurlFromPodInHostNetNS(tftpURL, count, k8s1NodeName)
testCurlFromPodInHostNetNS(tftpURL, count, k8s2NodeName)
httpURL = getHTTPLink(k8s1IP, data.Spec.Ports[0].NodePort)
tftpURL = getTFTPLink(k8s1IP, data.Spec.Ports[1].NodePort)
testCurlFailFromPodInHostNetNS(httpURL, count, k8s1NodeName)
testCurlFailFromPodInHostNetNS(httpURL, count, k8s2NodeName)
testCurlFailFromPodInHostNetNS(tftpURL, count, k8s1NodeName)
testCurlFailFromPodInHostNetNS(tftpURL, count, k8s2NodeName)
}
testHostPort := func() {
var (
httpURL string
tftpURL string
)
httpHostPort := int32(8080)
tftpHostPort := int32(6969)
httpHostPortStr := strconv.Itoa(int(httpHostPort))
tftpHostPortStr := strconv.Itoa(int(tftpHostPort))
count := 10
pod, err := kubectl.GetCiliumPodOnNode(helpers.CiliumNamespace, helpers.K8s2)
ExpectWithOffset(1, err).Should(BeNil(), "Cannot determine cilium pod name")
res := kubectl.CiliumExecContext(context.TODO(), pod, "cilium service list | grep "+k8s2IP+":"+httpHostPortStr+" | grep HostPort")
ExpectWithOffset(1, res.GetStdOut()).ShouldNot(BeEmpty(), "No HostPort entry for "+k8s2IP+":"+httpHostPortStr)
res = kubectl.CiliumExecContext(context.TODO(), pod, "cilium service list | grep "+k8s2IP+":"+tftpHostPortStr+" | grep HostPort")
ExpectWithOffset(1, res.GetStdOut()).ShouldNot(BeEmpty(), "No HostPort entry for "+k8s2IP+":"+tftpHostPortStr)
// Cluster-internal connectivity to HostPort
httpURL = getHTTPLink(k8s2IP, httpHostPort)
tftpURL = getTFTPLink(k8s2IP, tftpHostPort)
// ... from same node
testCurlFromPodInHostNetNS(httpURL, count, k8s2NodeName)
testCurlFromPodInHostNetNS(tftpURL, count, k8s2NodeName)
// ... from different node
testCurlFromPodInHostNetNS(httpURL, count, k8s1NodeName)
testCurlFromPodInHostNetNS(tftpURL, count, k8s1NodeName)
}
testHealthCheckNodePort := func() {
var data v1.Service
// Service with HealthCheckNodePort that only has backends on k8s2
err := kubectl.Get(helpers.DefaultNamespace, "service test-lb-local-k8s2").Unmarshal(&data)
ExpectWithOffset(1, err).Should(BeNil(), "Can not retrieve service")
count := 10
// Checks that requests to k8s2 return 200
url := getHTTPLink(k8s2IP, data.Spec.HealthCheckNodePort)
testCurlFromPodInHostNetNSExpectingHTTPCode(url, count, "200", k8s1NodeName)
testCurlFromPodInHostNetNSExpectingHTTPCode(url, count, "200", k8s2NodeName)
// Checks that requests to k8s1 return 503 Service Unavailable
url = getHTTPLink(k8s1IP, data.Spec.HealthCheckNodePort)
testCurlFromPodInHostNetNSExpectingHTTPCode(url, count, "503", k8s1NodeName)
testCurlFromPodInHostNetNSExpectingHTTPCode(url, count, "503", k8s2NodeName)
}
testIPv4FragmentSupport := func() {
var (
data v1.Service
srcPort = 12345
)
kubeProxy := !helpers.RunsWithoutKubeProxy()
// Get testDSClient and testDS pods running on k8s1.
// This is because we search for new packets in the
// conntrack table for node k8s1.