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traceflow_controller.go
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traceflow_controller.go
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// Copyright 2020 Antrea 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 traceflow
import (
"context"
"encoding/json"
"errors"
"fmt"
"net"
"sync"
"time"
"antrea.io/libOpenflow/protocol"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/informers"
clientset "k8s.io/client-go/kubernetes"
corelisters "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog/v2"
"antrea.io/antrea/pkg/agent/config"
"antrea.io/antrea/pkg/agent/interfacestore"
"antrea.io/antrea/pkg/agent/openflow"
"antrea.io/antrea/pkg/agent/util"
crdv1alpha1 "antrea.io/antrea/pkg/apis/crd/v1alpha1"
clientsetversioned "antrea.io/antrea/pkg/client/clientset/versioned"
crdinformers "antrea.io/antrea/pkg/client/informers/externalversions/crd/v1alpha1"
crdlisters "antrea.io/antrea/pkg/client/listers/crd/v1alpha1"
"antrea.io/antrea/pkg/features"
binding "antrea.io/antrea/pkg/ovs/openflow"
"antrea.io/antrea/pkg/ovs/ovsconfig"
"antrea.io/antrea/pkg/querier"
)
const (
controllerName = "AntreaAgentTraceflowController"
// Set resyncPeriod to 0 to disable resyncing.
resyncPeriod time.Duration = 0
// How long to wait before retrying the processing of a traceflow.
minRetryDelay = 5 * time.Second
maxRetryDelay = 300 * time.Second
// Default number of workers processing traceflow request.
defaultWorkers = 4
// Delay in milliseconds before injecting packet into OVS. The time of different nodes may not be completely
// synchronized, which requires a delay before inject packet.
injectPacketDelay = 2000
injectLocalPacketDelay = 100
// ICMP Echo Request type and code.
icmpEchoRequestType uint8 = 8
icmpv6EchoRequestType uint8 = 128
icmpEchoRequestCode uint8 = 0
defaultTTL uint8 = 64
)
type traceflowState struct {
name string
tag uint8
liveTraffic bool
droppedOnly bool
// Live-traffic Traceflow with only destination Pod specified.
receiverOnly bool
isSender bool
// Agent received the first Traceflow packet from OVS.
receivedPacket bool
}
// Controller is responsible for setting up Openflow entries and injecting traceflow packet into
// the switch for traceflow request.
type Controller struct {
kubeClient clientset.Interface
serviceLister corelisters.ServiceLister
serviceListerSynced cache.InformerSynced
traceflowClient clientsetversioned.Interface
traceflowInformer crdinformers.TraceflowInformer
traceflowLister crdlisters.TraceflowLister
traceflowListerSynced cache.InformerSynced
ovsBridgeClient ovsconfig.OVSBridgeClient
ofClient openflow.Client
networkPolicyQuerier querier.AgentNetworkPolicyInfoQuerier
interfaceStore interfacestore.InterfaceStore
networkConfig *config.NetworkConfig
nodeConfig *config.NodeConfig
serviceCIDR *net.IPNet // K8s Service ClusterIP CIDR
queue workqueue.RateLimitingInterface
runningTraceflowsMutex sync.RWMutex
// runningTraceflows is a map for storing the running Traceflow state
// with dataplane tag to be the key.
runningTraceflows map[uint8]*traceflowState
}
// NewTraceflowController instantiates a new Controller object which will process Traceflow
// events.
func NewTraceflowController(
kubeClient clientset.Interface,
informerFactory informers.SharedInformerFactory,
traceflowClient clientsetversioned.Interface,
traceflowInformer crdinformers.TraceflowInformer,
client openflow.Client,
npQuerier querier.AgentNetworkPolicyInfoQuerier,
ovsBridgeClient ovsconfig.OVSBridgeClient,
interfaceStore interfacestore.InterfaceStore,
networkConfig *config.NetworkConfig,
nodeConfig *config.NodeConfig,
serviceCIDR *net.IPNet) *Controller {
c := &Controller{
kubeClient: kubeClient,
traceflowClient: traceflowClient,
traceflowInformer: traceflowInformer,
traceflowLister: traceflowInformer.Lister(),
traceflowListerSynced: traceflowInformer.Informer().HasSynced,
ovsBridgeClient: ovsBridgeClient,
ofClient: client,
networkPolicyQuerier: npQuerier,
interfaceStore: interfaceStore,
networkConfig: networkConfig,
nodeConfig: nodeConfig,
serviceCIDR: serviceCIDR,
queue: workqueue.NewNamedRateLimitingQueue(workqueue.NewItemExponentialFailureRateLimiter(minRetryDelay, maxRetryDelay), "traceflow"),
runningTraceflows: make(map[uint8]*traceflowState),
}
// Add handlers for Traceflow events.
traceflowInformer.Informer().AddEventHandlerWithResyncPeriod(
cache.ResourceEventHandlerFuncs{
AddFunc: c.addTraceflow,
UpdateFunc: c.updateTraceflow,
DeleteFunc: c.deleteTraceflow,
},
resyncPeriod,
)
// Register packetInHandler
c.ofClient.RegisterPacketInHandler(uint8(openflow.PacketInReasonTF), "traceflow", c)
// Add serviceLister if AntreaProxy enabled
if features.DefaultFeatureGate.Enabled(features.AntreaProxy) {
c.serviceLister = informerFactory.Core().V1().Services().Lister()
c.serviceListerSynced = informerFactory.Core().V1().Services().Informer().HasSynced
}
return c
}
// enqueueTraceflow adds an object to the controller work queue.
func (c *Controller) enqueueTraceflow(tf *crdv1alpha1.Traceflow) {
c.queue.Add(tf.Name)
}
// Run will create defaultWorkers workers (go routines) which will process the Traceflow events from the
// workqueue.
func (c *Controller) Run(stopCh <-chan struct{}) {
defer c.queue.ShutDown()
klog.Infof("Starting %s", controllerName)
defer klog.Infof("Shutting down %s", controllerName)
cacheSyncs := []cache.InformerSynced{c.traceflowListerSynced}
if features.DefaultFeatureGate.Enabled(features.AntreaProxy) {
cacheSyncs = append(cacheSyncs, c.serviceListerSynced)
}
if !cache.WaitForNamedCacheSync(controllerName, stopCh, cacheSyncs...) {
return
}
for i := 0; i < defaultWorkers; i++ {
go wait.Until(c.worker, time.Second, stopCh)
}
<-stopCh
}
func (c *Controller) addTraceflow(obj interface{}) {
tf := obj.(*crdv1alpha1.Traceflow)
klog.Infof("Processing Traceflow %s ADD event", tf.Name)
c.enqueueTraceflow(tf)
}
func (c *Controller) updateTraceflow(_, curObj interface{}) {
tf := curObj.(*crdv1alpha1.Traceflow)
klog.Infof("Processing Traceflow %s UPDATE event", tf.Name)
c.enqueueTraceflow(tf)
}
func (c *Controller) deleteTraceflow(old interface{}) {
tf := old.(*crdv1alpha1.Traceflow)
klog.Infof("Processing Traceflow %s DELETE event", tf.Name)
c.enqueueTraceflow(tf)
}
// worker is a long-running function that will continually call the processTraceflowItem function
// in order to read and process a message on the workqueue.
func (c *Controller) worker() {
for c.processTraceflowItem() {
}
}
// processTraceflowItem processes an item in the "traceflow" work queue, by calling syncTraceflow
// after casting the item to a string (Traceflow name). If syncTraceflow returns an error, this
// function logs error. If syncTraceflow is successful, the Traceflow is removed from the queue
// until we get notified of a new change. This function returns false if and only if the work queue
// was shutdown (no more items will be processed).
func (c *Controller) processTraceflowItem() bool {
obj, quit := c.queue.Get()
if quit {
return false
}
// We call Done here so the workqueue knows we have finished processing this item. We also
// must remember to call Forget if we do not want this work item being re-queued. For
// example, we do not call Forget if a transient error occurs, instead the item is put back
// on the workqueue and attempted again after a back-off period.
defer c.queue.Done(obj)
// We expect strings (Traceflow name) to come off the workqueue.
if key, ok := obj.(string); !ok {
// As the item in the workqueue is actually invalid, we call Forget here else we'd
// go into a loop of attempting to process a work item that is invalid.
// This should not happen: enqueueTraceflow only enqueues strings.
c.queue.Forget(obj)
klog.Errorf("Expected string in work queue but got %#v", obj)
return true
} else if err := c.syncTraceflow(key); err == nil {
// If no error occurs we Forget this item so it does not get queued again.
c.queue.Forget(key)
} else {
// If error occurs we log error.
klog.Errorf("Error syncing Traceflow %s, exiting. Error: %v", key, err)
}
return true
}
// TODO: Let controller compute which Node is the sender, and each Node watch the TF CRD with some
// filter to get and process only TF from the Node.
// syncTraceflow gets Traceflow CRD by name, update cache and start syncing.
func (c *Controller) syncTraceflow(traceflowName string) error {
startTime := time.Now()
defer func() {
klog.V(4).Infof("Finished syncing Traceflow for %s. (%v)", traceflowName, time.Since(startTime))
}()
tf, err := c.traceflowLister.Get(traceflowName)
if err != nil {
if apierrors.IsNotFound(err) {
c.cleanupTraceflow(traceflowName)
return nil
}
return err
}
switch tf.Status.Phase {
case crdv1alpha1.Running:
if tf.Status.DataplaneTag != 0 {
start := false
c.runningTraceflowsMutex.Lock()
if _, ok := c.runningTraceflows[tf.Status.DataplaneTag]; !ok {
start = true
}
c.runningTraceflowsMutex.Unlock()
if start {
err = c.startTraceflow(tf)
}
} else {
klog.Warningf("Invalid data plane tag %d for Traceflow %s", tf.Status.DataplaneTag, tf.Name)
}
default:
c.cleanupTraceflow(traceflowName)
}
return err
}
// startTraceflow deploys OVS flow entries for Traceflow and inject packet if current Node
// is Sender Node.
func (c *Controller) startTraceflow(tf *crdv1alpha1.Traceflow) error {
err := c.validateTraceflow(tf)
defer func() {
if err != nil {
c.cleanupTraceflow(tf.Name)
c.errorTraceflowCRD(tf, fmt.Sprintf("Node: %s, error: %+v", c.nodeConfig.Name, err))
}
}()
if err != nil {
return err
}
liveTraffic := tf.Spec.LiveTraffic
if tf.Spec.Source.Pod == "" && tf.Spec.Destination.Pod == "" {
klog.Errorf("Traceflow %s has neither source nor destination Pod specified", tf.Name)
return nil
}
if tf.Spec.Source.Pod == "" && !liveTraffic {
klog.Errorf("Traceflow %s does not have source Pod specified", tf.Name)
return nil
}
receiverOnly := false
var pod, ns string
if tf.Spec.Source.Pod != "" {
pod = tf.Spec.Source.Pod
ns = tf.Spec.Source.Namespace
} else {
// Live-traffic Traceflow with only the Destination Pod specified.
pod = tf.Spec.Destination.Pod
ns = tf.Spec.Destination.Namespace
receiverOnly = true
}
// TODO: let controller compute the sender/receiver Node, and the sender
// /receiver Node can just return an error, if fails to find the Pod.
podInterfaces := c.interfaceStore.GetContainerInterfacesByPod(pod, ns)
isSender := len(podInterfaces) > 0 && !receiverOnly
var packet, matchPacket *binding.Packet
var ofPort uint32
if len(podInterfaces) > 0 {
packet, err = c.preparePacket(tf, podInterfaces[0], receiverOnly)
if err != nil {
return err
}
ofPort = uint32(podInterfaces[0].OFPort)
// On the sender or receiver (the receiverOnly case) Node, trace
// the first packet of the first connection that matches the
// Traceflow spec.
if liveTraffic {
matchPacket = packet
}
klog.V(2).Infof("Traceflow packet %v", *packet)
}
// Store Traceflow to cache.
c.runningTraceflowsMutex.Lock()
tfState := traceflowState{
name: tf.Name, tag: tf.Status.DataplaneTag,
liveTraffic: liveTraffic, droppedOnly: tf.Spec.DroppedOnly && liveTraffic,
receiverOnly: receiverOnly, isSender: isSender}
c.runningTraceflows[tfState.tag] = &tfState
c.runningTraceflowsMutex.Unlock()
// Install flow entries for traceflow.
klog.V(2).Infof("Installing flow entries for Traceflow %s", tf.Name)
timeout := tf.Spec.Timeout
if timeout == 0 {
timeout = crdv1alpha1.DefaultTraceflowTimeout
}
err = c.ofClient.InstallTraceflowFlows(tfState.tag, liveTraffic, tfState.droppedOnly, receiverOnly, matchPacket, ofPort, timeout)
if err != nil {
return err
}
// Skip packet injection if the source Pod is not found on the local Node.
if !liveTraffic && isSender {
if packet.DestinationMAC == nil {
// If the destination is Service/IP or the packet will
// be sent to remote Node, wait a small period for other
// Nodes.
time.Sleep(time.Duration(injectPacketDelay) * time.Millisecond)
} else {
// Issue #2116
// Wait a small period after flows installed to avoid unexpected behavior.
time.Sleep(time.Duration(injectLocalPacketDelay) * time.Millisecond)
}
klog.V(2).Infof("Injecting packet for Traceflow %s", tf.Name)
err = c.ofClient.SendTraceflowPacket(tfState.tag, packet, ofPort, -1)
}
return err
}
func (c *Controller) validateTraceflow(tf *crdv1alpha1.Traceflow) error {
if tf.Spec.Destination.Service != "" && !features.DefaultFeatureGate.Enabled(features.AntreaProxy) {
return errors.New("using Service destination requires AntreaProxy feature enabled")
}
if tf.Spec.Destination.IP != "" {
destIP := net.ParseIP(tf.Spec.Destination.IP)
if destIP == nil {
return fmt.Errorf("destination IP is not valid: %s", tf.Spec.Destination.IP)
}
// When AntreaProxy is enabled, serviceCIDR is not required and may be set to a
// default value which does not match the cluster configuration.
if !features.DefaultFeatureGate.Enabled(features.AntreaProxy) && c.serviceCIDR.Contains(destIP) {
return errors.New("using ClusterIP destination requires AntreaProxy feature enabled")
}
}
return nil
}
func (c *Controller) preparePacket(tf *crdv1alpha1.Traceflow, intf *interfacestore.InterfaceConfig, receiverOnly bool) (*binding.Packet, error) {
liveTraffic := tf.Spec.LiveTraffic
isICMP := false
packet := new(binding.Packet)
packet.IsIPv6 = tf.Spec.Packet.IPv6Header != nil
if !liveTraffic {
if packet.IsIPv6 {
packet.SourceIP = intf.GetIPv6Addr()
if packet.SourceIP == nil {
return nil, errors.New("source Pod does not have an IPv6 address")
}
} else {
packet.SourceIP = intf.GetIPv4Addr()
if packet.SourceIP == nil {
return nil, errors.New("source Pod does not have an IPv4 address")
}
}
packet.SourceMAC = intf.MAC
}
if receiverOnly {
if tf.Spec.Source.IP != "" {
packet.SourceIP = net.ParseIP(tf.Spec.Source.IP)
isIPv6 := packet.SourceIP.To4() == nil
if isIPv6 != packet.IsIPv6 {
return nil, errors.New("source IP does not match the IP header family")
}
}
// The packet will be matched with the Pod MAC.
packet.DestinationMAC = intf.MAC
} else if tf.Spec.Destination.IP != "" {
packet.DestinationIP = net.ParseIP(tf.Spec.Destination.IP)
if packet.DestinationIP == nil {
return nil, errors.New("invalid destination IP address")
}
isIPv6 := packet.DestinationIP.To4() == nil
if isIPv6 != packet.IsIPv6 {
return nil, errors.New("destination IP does not match the IP header family")
}
if !liveTraffic {
dstPodInterface, hasInterface := c.interfaceStore.GetInterfaceByIP(tf.Spec.Destination.IP)
if hasInterface {
packet.DestinationMAC = dstPodInterface.MAC
}
}
} else if tf.Spec.Destination.Pod != "" {
dstPodInterfaces := c.interfaceStore.GetContainerInterfacesByPod(tf.Spec.Destination.Pod, tf.Spec.Destination.Namespace)
if len(dstPodInterfaces) > 0 {
if packet.IsIPv6 {
packet.DestinationIP = dstPodInterfaces[0].GetIPv6Addr()
} else {
packet.DestinationIP = dstPodInterfaces[0].GetIPv4Addr()
}
if !liveTraffic {
packet.DestinationMAC = dstPodInterfaces[0].MAC
}
} else {
dstPod, err := c.kubeClient.CoreV1().Pods(tf.Spec.Destination.Namespace).Get(context.TODO(), tf.Spec.Destination.Pod, metav1.GetOptions{})
if err != nil {
return nil, fmt.Errorf("failed to get the destination Pod: %v", err)
}
// DestinationMAC is nil here, will be set to gateway
// MAC in ofClient.SendTraceflowPacket()
podIPs := make([]net.IP, len(dstPod.Status.PodIPs))
for i, ip := range dstPod.Status.PodIPs {
podIPs[i] = net.ParseIP(ip.IP)
}
if packet.IsIPv6 {
packet.DestinationIP, _ = util.GetIPWithFamily(podIPs, util.FamilyIPv6)
} else {
packet.DestinationIP = util.GetIPv4Addr(podIPs)
}
}
if packet.DestinationIP == nil {
if packet.IsIPv6 {
return nil, errors.New("destination Pod does not have an IPv6 address")
}
return nil, errors.New("destination Pod does not have an IPv4 address")
}
} else if tf.Spec.Destination.Service != "" {
dstSvc, err := c.serviceLister.Services(tf.Spec.Destination.Namespace).Get(tf.Spec.Destination.Service)
if err != nil {
return nil, fmt.Errorf("failed to get the destination Service: %v", err)
}
if dstSvc.Spec.ClusterIP == "" {
return nil, errors.New("destination Service does not have a ClusterIP")
}
packet.DestinationIP = net.ParseIP(dstSvc.Spec.ClusterIP)
if !packet.IsIPv6 {
packet.DestinationIP = packet.DestinationIP.To4()
if packet.DestinationIP == nil {
return nil, errors.New("destination Service does not have an IPv4 ClusterIP")
}
} else if packet.DestinationIP.To4() != nil {
return nil, errors.New("destination Service does not have an IPv6 ClusterIP")
}
if !liveTraffic {
// Set the SYN flag. In encap mode, the SYN flag is only required for
// Service traffic, but probably we should always set it.
packet.TCPFlags = 2
}
} else if !liveTraffic {
return nil, errors.New("destination is not specified")
}
if tf.Spec.Packet.IPv6Header != nil {
// IP Protocol 0 (IPv6 Hop-by-Hop Option) is not supported by
// Traceflow. If NextHeader is not provided, protocol ICMPv6
// will be used as the default.
if tf.Spec.Packet.IPv6Header.NextHeader != nil {
packet.IPProto = uint8(*tf.Spec.Packet.IPv6Header.NextHeader)
}
if !liveTraffic {
packet.TTL = uint8(tf.Spec.Packet.IPv6Header.HopLimit)
packet.IPFlags = 0
}
} else {
packet.IPProto = uint8(tf.Spec.Packet.IPHeader.Protocol)
if !liveTraffic {
packet.TTL = uint8(tf.Spec.Packet.IPHeader.TTL)
packet.IPFlags = uint16(tf.Spec.Packet.IPHeader.Flags)
}
}
if !liveTraffic && packet.TTL == 0 {
packet.TTL = defaultTTL
}
// TCP > UDP > ICMP > other IP protocol.
if tf.Spec.Packet.TransportHeader.TCP != nil {
packet.IPProto = protocol.Type_TCP
packet.SourcePort = uint16(tf.Spec.Packet.TransportHeader.TCP.SrcPort)
packet.DestinationPort = uint16(tf.Spec.Packet.TransportHeader.TCP.DstPort)
if tf.Spec.Packet.TransportHeader.TCP.Flags != 0 {
packet.TCPFlags = uint8(tf.Spec.Packet.TransportHeader.TCP.Flags)
}
} else if tf.Spec.Packet.TransportHeader.UDP != nil {
packet.IPProto = protocol.Type_UDP
packet.SourcePort = uint16(tf.Spec.Packet.TransportHeader.UDP.SrcPort)
packet.DestinationPort = uint16(tf.Spec.Packet.TransportHeader.UDP.DstPort)
} else if tf.Spec.Packet.TransportHeader.ICMP != nil {
isICMP = true
if !liveTraffic {
packet.ICMPEchoID = uint16(tf.Spec.Packet.TransportHeader.ICMP.ID)
packet.ICMPEchoSeq = uint16(tf.Spec.Packet.TransportHeader.ICMP.Sequence)
}
}
// Defaults to ICMP if not live-traffic Traceflow.
if packet.IPProto == 0 && !liveTraffic || packet.IPProto == protocol.Type_ICMP || packet.IPProto == protocol.Type_IPv6ICMP {
isICMP = true
}
if isICMP {
if packet.IsIPv6 {
packet.IPProto = protocol.Type_IPv6ICMP
if !liveTraffic {
packet.ICMPType = icmpv6EchoRequestType
}
} else {
packet.IPProto = protocol.Type_ICMP
if !liveTraffic {
packet.ICMPType = icmpEchoRequestType
}
}
if !liveTraffic {
packet.ICMPCode = icmpEchoRequestCode
}
}
return packet, nil
}
func (c *Controller) errorTraceflowCRD(tf *crdv1alpha1.Traceflow, reason string) (*crdv1alpha1.Traceflow, error) {
tf.Status.Phase = crdv1alpha1.Failed
type Traceflow struct {
Status crdv1alpha1.TraceflowStatus `json:"status,omitempty"`
}
patchData := Traceflow{Status: crdv1alpha1.TraceflowStatus{Phase: tf.Status.Phase, Reason: reason}}
payloads, _ := json.Marshal(patchData)
return c.traceflowClient.CrdV1alpha1().Traceflows().Patch(context.TODO(), tf.Name, types.MergePatchType, payloads, metav1.PatchOptions{}, "status")
}
// Delete Traceflow from cache.
func (c *Controller) deleteTraceflowState(tfName string) *traceflowState {
c.runningTraceflowsMutex.Lock()
defer c.runningTraceflowsMutex.Unlock()
// Controller could have deallocated the tag and cleared the DataplaneTag
// field in the Traceflow Status, so try looking up the tag from the
// cache by Traceflow name.
for tag, tfState := range c.runningTraceflows {
if tfName == tfState.name {
delete(c.runningTraceflows, tag)
return tfState
}
}
return nil
}
// Delete Traceflow state and OVS flows.
func (c *Controller) cleanupTraceflow(tfName string) {
tfState := c.deleteTraceflowState(tfName)
if tfState != nil {
err := c.ofClient.UninstallTraceflowFlows(tfState.tag)
if err != nil {
klog.Errorf("Failed to uninstall Traceflow %s flows: %v", tfName, err)
}
}
}