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antrea_ipam_controller.go
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antrea_ipam_controller.go
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// Copyright 2021 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 ipam
import (
"fmt"
"net"
"strings"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/util/sets"
coreinformers "k8s.io/client-go/informers/core/v1"
corelisters "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/klog/v2"
crdv1a2 "antrea.io/antrea/pkg/apis/crd/v1alpha2"
clientsetversioned "antrea.io/antrea/pkg/client/clientset/versioned"
crdinformers "antrea.io/antrea/pkg/client/informers/externalversions/crd/v1alpha2"
crdlisters "antrea.io/antrea/pkg/client/listers/crd/v1alpha2"
annotation "antrea.io/antrea/pkg/ipam"
"antrea.io/antrea/pkg/ipam/poolallocator"
"antrea.io/antrea/pkg/util/k8s"
)
const (
controllerName = "AntreaIPAMController"
// Pod index name for IPPool cache.
podIndex = "pod"
)
// Antrea IPAM Controller maintains map of Namespace annotations using
// Namespace informer. In future, which Antrea IPAM support expands,
// this controller can be used to store annotations for other objects,
// such as Statefulsets.
type AntreaIPAMController struct {
crdClient clientsetversioned.Interface
ipPoolInformer crdinformers.IPPoolInformer
ipPoolLister crdlisters.IPPoolLister
namespaceInformer coreinformers.NamespaceInformer
namespaceLister corelisters.NamespaceLister
podInformer cache.SharedIndexInformer
podLister corelisters.PodLister
}
func podIndexFunc(obj interface{}) ([]string, error) {
ipPool, ok := obj.(*crdv1a2.IPPool)
if !ok {
return nil, fmt.Errorf("obj is not IPPool: %+v", obj)
}
podNames := sets.New[string]()
for _, ipAddress := range ipPool.Status.IPAddresses {
if ipAddress.Owner.Pod != nil {
podNames.Insert(k8s.NamespacedName(ipAddress.Owner.Pod.Namespace, ipAddress.Owner.Pod.Name))
}
}
return podNames.UnsortedList(), nil
}
func InitializeAntreaIPAMController(crdClient clientsetversioned.Interface,
namespaceInformer coreinformers.NamespaceInformer,
ipPoolInformer crdinformers.IPPoolInformer,
podInformer cache.SharedIndexInformer, ipamAnnotations bool) (*AntreaIPAMController, error) {
// Order of init causes antreaIPAMDriver to be initialized first
// After controller is initialized by agent init, we need to make it
// know to the driver
if antreaIPAMDriver == nil {
return nil, fmt.Errorf("Antrea IPAM driver failed to initialize")
}
var antreaIPAMController *AntreaIPAMController
ipPoolInformer.Informer().AddIndexers(cache.Indexers{podIndex: podIndexFunc})
// Create podInformer/Lister and namespaceInformer/Lister if need to read the AntreaIPAM
// annotation on Pods and Namespaces.
if ipamAnnotations {
antreaIPAMController = &AntreaIPAMController{
crdClient: crdClient,
ipPoolInformer: ipPoolInformer,
ipPoolLister: ipPoolInformer.Lister(),
namespaceInformer: namespaceInformer,
namespaceLister: namespaceInformer.Lister(),
podInformer: podInformer,
podLister: corelisters.NewPodLister(podInformer.GetIndexer()),
}
} else {
antreaIPAMController = &AntreaIPAMController{
crdClient: crdClient,
ipPoolInformer: ipPoolInformer,
ipPoolLister: ipPoolInformer.Lister(),
}
}
return antreaIPAMController, nil
}
// Run starts to watch and process Namespace updates for the Node where Antrea Agent
// is running, and maintain a mapping between Namespace name and IPAM annotations.
func (c *AntreaIPAMController) Run(stopCh <-chan struct{}) {
defer func() {
klog.V(2).InfoS("Shutting down", "controller", controllerName)
}()
klog.InfoS("Starting", "controller", controllerName)
cacheSyncs := []cache.InformerSynced{c.ipPoolInformer.Informer().HasSynced}
if c.podInformer != nil && c.namespaceInformer != nil {
cacheSyncs = append(cacheSyncs, c.podInformer.HasSynced, c.namespaceInformer.Informer().HasSynced)
}
if !cache.WaitForNamedCacheSync(controllerName, stopCh, cacheSyncs...) {
return
}
antreaIPAMDriver.setController(c)
<-stopCh
}
// Look up IPPools from the Pod annotation.
func (c *AntreaIPAMController) getIPPoolsByPod(namespace, name string) ([]string, []net.IP, *crdv1a2.IPAddressOwner, error) {
var ips []net.IP
var reservedOwner *crdv1a2.IPAddressOwner
pod, err := c.podLister.Pods(namespace).Get(name)
if err != nil {
return nil, nil, nil, err
}
annotations, exists := pod.Annotations[annotation.AntreaIPAMAnnotationKey]
if !exists {
// Find IPPool by Namespace
ns, err := c.namespaceLister.Get(namespace)
if err != nil {
return nil, nil, nil, nil
}
annotations, exists = ns.Annotations[annotation.AntreaIPAMAnnotationKey]
if !exists {
return nil, nil, nil, nil
}
}
// Collect specified IPs if exist
ipStrings, _ := pod.Annotations[annotation.AntreaIPAMPodIPAnnotationKey]
ipStrings = strings.ReplaceAll(ipStrings, " ", "")
var ipErr error
if ipStrings != "" {
splittedIPStrings := strings.Split(ipStrings, annotation.AntreaIPAMAnnotationDelimiter)
for _, ipString := range splittedIPStrings {
ip := net.ParseIP(ipString)
if ipString != "" && ip == nil {
ipErr = fmt.Errorf("invalid IP annotation %s", ipStrings)
ips = nil
break
}
ips = append(ips, ip)
}
}
ownerReferenceLoop:
for _, ownerReference := range pod.OwnerReferences {
if ownerReference.Controller != nil && *ownerReference.Controller == true {
switch ownerReference.Kind {
case "StatefulSet":
// Parse StatefulSet name/index from Pod name
statefulSetName, index, err := k8s.ParseStatefulSetName(name)
if err != nil {
// This should not occur unless user creates an invalid Pod manually
klog.Warningf("Invalid StatefulSet name: %s", name)
break ownerReferenceLoop
}
reservedOwner = &crdv1a2.IPAddressOwner{StatefulSet: &crdv1a2.StatefulSetOwner{
Name: statefulSetName,
Namespace: namespace,
Index: index,
}}
break ownerReferenceLoop
}
}
}
return strings.Split(annotations, annotation.AntreaIPAMAnnotationDelimiter), ips, reservedOwner, ipErr
}
// Look up IPPools from the Pod annotation.
func (c *AntreaIPAMController) getPoolAllocatorByPod(namespace, podName string) (mineType, *poolallocator.IPPoolAllocator, []net.IP, *crdv1a2.IPAddressOwner, error) {
poolNames, ips, reservedOwner, err := c.getIPPoolsByPod(namespace, podName)
if err != nil {
return mineUnknown, nil, nil, nil, err
} else if len(poolNames) == 0 {
return mineFalse, nil, nil, nil, nil
}
var allocator *poolallocator.IPPoolAllocator
for _, p := range poolNames {
allocator, err = poolallocator.NewIPPoolAllocator(p, c.crdClient, c.ipPoolLister)
if err != nil {
if !errors.IsNotFound(err) {
err = fmt.Errorf("failed to get IPPool %s: %v", p, err)
break
}
klog.InfoS("IPPool not found", "pool", p)
err = nil
} else if allocator.IPVersion == crdv1a2.IPv4 {
// Support IPv6 / dual stack in future.
break
}
}
if err == nil && allocator == nil {
err = fmt.Errorf("no valid IPPool found")
}
return mineTrue, allocator, ips, reservedOwner, err
}
// Look up IPPools by matching PodOwnder.
func (c *AntreaIPAMController) getPoolAllocatorsByOwner(podOwner *crdv1a2.PodOwner) ([]*poolallocator.IPPoolAllocator, error) {
var allocators []*poolallocator.IPPoolAllocator
ipPools, _ := c.ipPoolInformer.Informer().GetIndexer().ByIndex(podIndex,
k8s.NamespacedName(podOwner.Namespace, podOwner.Name))
for _, item := range ipPools {
ipPool := item.(*crdv1a2.IPPool)
for _, ipAddress := range ipPool.Status.IPAddresses {
savedPod := ipAddress.Owner.Pod
if savedPod != nil && savedPod.ContainerID == podOwner.ContainerID && savedPod.IFName == podOwner.IFName {
allocator, err := poolallocator.NewIPPoolAllocator(ipPool.Name, c.crdClient, c.ipPoolLister)
if err != nil {
return nil, err
}
allocators = append(allocators, allocator)
}
}
}
return allocators, nil
}
func (c *AntreaIPAMController) getPoolAllocatorByName(poolName string) (*poolallocator.IPPoolAllocator, error) {
return poolallocator.NewIPPoolAllocator(poolName, c.crdClient, c.ipPoolLister)
}