17601237263

Committed 10 Sep 2025 02:25AM UTC coverage: 21.232% (-0.1%) from 21.329%

Build # 17601237263

Build Type

push

github

Committed by

web-flow

Commit Message

Feat: Added non primary cni mode support for Kube-OVN (#5618)

* Add support for secondary CNI configuration

Signed-off-by: Vishal Mohan <vishalmohan@microsoft.com>

* Enhanced VPC NAT gateway to work with secondary interface

Signed-off-by: Vishal Mohan <vishalmohan@microsoft.com>

* Enhance NAT gateway and pod handling for non-primary CNI support

Signed-off-by: Vishal Mohan <vishalmohan@microsoft.com>

* Fixed compile

Signed-off-by: Vishal Mohan <vishalmohan@microsoft.com>

* Fix typo in TODO comment and improve error handling in getNadInterfaceFromNetworkStatusAnnotation

Signed-off-by: Vishal Mohan <vishalmohan@microsoft.com>

* Refactor getNadInterfaceFromNetworkStatusAnnotation to util package and update references in VPC NAT gateway

Signed-off-by: Vishal Mohan <vishalmohan@microsoft.com>

* Add support for non-primary CNI mode and improve VPC NAT gateway handling

- Introduced non-primary CNI configuration in values.yaml.
- Updated controller deployment to include non-primary CNI flag.
- Refactored NAT gateway script to use correct environment file path.
- Enhanced endpoint slice handling to utilize secondary IPs.
- Simplified pod provider extraction logic for VPC NAT gateway.
- Improved annotation management for VPC CIDRs in NAT gateway.

Signed-off-by: Vishal Mohan <vishalmohan@microsoft.com>

* Apply suggestions from code review

Signed-off-by: Vishal Mohan <vishalmohan@microsoft.com>

* Fixed lint
- Refactor variable type from 'interface{}' to 'any' in GetNadInterfaceFromNetworkStatusAnnotation for clarity
- Fixed pod routes annotation to use subnetProvider variable in vpc nat gw genNatGwStatefulSet

Signed-off-by: Vishal Mohan <vishalmohan@microsoft.com>

* fix lint issues

Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>

* Refactor endpoint slice handling to improve secondary IP address updates and add conditional provider retrieval for VPC NAT gateway support

Signed-off-by: Vishal Mohan <vishalmohan@microsoft.com>

* Updated He... (continued)

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0.0

/pkg/controller/pod.go

package controller

import (
        "context"
        "encoding/json"
        "errors"
        "fmt"
        "maps"
        "net"
        "slices"
        "strconv"
        "strings"
        "sync"
        "time"

        nadv1 "github.com/k8snetworkplumbingwg/network-attachment-definition-client/pkg/apis/k8s.cni.cncf.io/v1"
        nadutils "github.com/k8snetworkplumbingwg/network-attachment-definition-client/pkg/utils"
        "github.com/scylladb/go-set/strset"
        v1 "k8s.io/api/core/v1"
        k8serrors "k8s.io/apimachinery/pkg/api/errors"
        metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
        "k8s.io/apimachinery/pkg/labels"
        "k8s.io/apimachinery/pkg/types"
        utilruntime "k8s.io/apimachinery/pkg/util/runtime"
        "k8s.io/client-go/kubernetes"
        "k8s.io/client-go/tools/cache"
        "k8s.io/klog/v2"
        "k8s.io/utils/ptr"

        kubeovnv1 "github.com/kubeovn/kube-ovn/pkg/apis/kubeovn/v1"
        "github.com/kubeovn/kube-ovn/pkg/ipam"
        "github.com/kubeovn/kube-ovn/pkg/ovs"
        "github.com/kubeovn/kube-ovn/pkg/ovsdb/ovnnb"
        "github.com/kubeovn/kube-ovn/pkg/request"
        "github.com/kubeovn/kube-ovn/pkg/util"
)

type NamedPort struct {
        mutex sync.RWMutex
        // first key is namespace, second key is portName
        namedPortMap map[string]map[string]*util.NamedPortInfo
}

func NewNamedPort() *NamedPort {
        return &NamedPort{
                mutex:        sync.RWMutex{},
                namedPortMap: map[string]map[string]*util.NamedPortInfo{},
        }
}

func (n *NamedPort) AddNamedPortByPod(pod *v1.Pod) {
        n.mutex.Lock()
        defer n.mutex.Unlock()
        ns := pod.Namespace
        podName := pod.Name

        restartableInitContainers := make([]v1.Container, 0, len(pod.Spec.InitContainers))
        for i := range pod.Spec.InitContainers {
                if pod.Spec.InitContainers[i].RestartPolicy != nil &&
                        *pod.Spec.InitContainers[i].RestartPolicy == v1.ContainerRestartPolicyAlways {
                        restartableInitContainers = append(restartableInitContainers, pod.Spec.InitContainers[i])
                }
        }

        containers := slices.Concat(restartableInitContainers, pod.Spec.Containers)
        if len(containers) == 0 {
                return
        }

        for _, container := range containers {
                if len(container.Ports) == 0 {
                        continue
                }

                for _, port := range container.Ports {
                        if port.Name == "" || port.ContainerPort == 0 {
                                continue
                        }

                        if _, ok := n.namedPortMap[ns]; ok {
                                if _, ok := n.namedPortMap[ns][port.Name]; ok {
                                        if n.namedPortMap[ns][port.Name].PortID == port.ContainerPort {
                                                n.namedPortMap[ns][port.Name].Pods.Add(podName)
                                        } else {
                                                klog.Warningf("named port %s has already be defined with portID %d",
                                                        port.Name, n.namedPortMap[ns][port.Name].PortID)
                                        }
                                        continue
                                }
                        } else {
                                n.namedPortMap[ns] = make(map[string]*util.NamedPortInfo)
                        }
                        n.namedPortMap[ns][port.Name] = &util.NamedPortInfo{
                                PortID: port.ContainerPort,
                                Pods:   strset.New(podName),
                        }
                }
        }
}

func (n *NamedPort) DeleteNamedPortByPod(pod *v1.Pod) {
        n.mutex.Lock()
        defer n.mutex.Unlock()

        ns := pod.Namespace
        podName := pod.Name

        if pod.Spec.Containers == nil {
                return
        }

        for _, container := range pod.Spec.Containers {
                if container.Ports == nil {
                        continue
                }

                for _, port := range container.Ports {
                        if port.Name == "" {
                                continue
                        }

                        if _, ok := n.namedPortMap[ns]; !ok {
                                continue
                        }

                        if _, ok := n.namedPortMap[ns][port.Name]; !ok {
                                continue
                        }

                        if !n.namedPortMap[ns][port.Name].Pods.Has(podName) {
                                continue
                        }

                        n.namedPortMap[ns][port.Name].Pods.Remove(podName)
                        if n.namedPortMap[ns][port.Name].Pods.Size() == 0 {
                                delete(n.namedPortMap[ns], port.Name)
                                if len(n.namedPortMap[ns]) == 0 {
                                        delete(n.namedPortMap, ns)
                                }
                        }
                }
        }
}

func (n *NamedPort) GetNamedPortByNs(namespace string) map[string]*util.NamedPortInfo {
        n.mutex.RLock()
        defer n.mutex.RUnlock()

        if result, ok := n.namedPortMap[namespace]; ok {
                for portName, info := range result {
                        klog.Infof("namespace %s's namedPort portname is %s with info %v", namespace, portName, info)
                }
                return result
        }
        return nil
}

func isPodAlive(p *v1.Pod) bool {
        if !p.DeletionTimestamp.IsZero() && p.DeletionGracePeriodSeconds != nil {
                now := time.Now()
                deletionTime := p.DeletionTimestamp.Time
                gracePeriod := time.Duration(*p.DeletionGracePeriodSeconds) * time.Second
                if now.After(deletionTime.Add(gracePeriod)) {
                        return false
                }
        }
        return isPodStatusPhaseAlive(p)
}

func isPodStatusPhaseAlive(p *v1.Pod) bool {
        if p.Status.Phase == v1.PodSucceeded && p.Spec.RestartPolicy != v1.RestartPolicyAlways {
                return false
        }

        if p.Status.Phase == v1.PodFailed && p.Spec.RestartPolicy == v1.RestartPolicyNever {
                return false
        }

        if p.Status.Phase == v1.PodFailed && p.Status.Reason == "Evicted" {
                return false
        }
        return true
}

func (c *Controller) enqueueAddPod(obj any) {
        p := obj.(*v1.Pod)
        if p.Spec.HostNetwork {
                return
        }

        // Pod might be targeted by manual endpoints and we need to recompute its port mappings
        c.enqueueStaticEndpointUpdateInNamespace(p.Namespace)

        // TODO: we need to find a way to reduce duplicated np added to the queue
        if c.config.EnableNP {
                c.namedPort.AddNamedPortByPod(p)
                if p.Status.PodIP != "" {
                        for _, np := range c.podMatchNetworkPolicies(p) {
                                klog.V(3).Infof("enqueue update network policy %s", np)
                                c.updateNpQueue.Add(np)
                        }
                }
        }

        key := cache.MetaObjectToName(p).String()
        if !isPodAlive(p) {
                isStateful, statefulSetName, statefulSetUID := isStatefulSetPod(p)
                isVMPod, vmName := isVMPod(p)
                if isStateful || (isVMPod && c.config.EnableKeepVMIP) {
                        if isStateful && isStatefulSetPodToDel(c.config.KubeClient, p, statefulSetName, statefulSetUID) {
                                klog.V(3).Infof("enqueue delete pod %s", key)
                                c.deletingPodObjMap.Store(key, p)
                                c.deletePodQueue.Add(key)
                        }
                        if isVMPod && c.isVMToDel(p, vmName) {
                                klog.V(3).Infof("enqueue delete pod %s", key)
                                c.deletingPodObjMap.Store(key, p)
                                c.deletePodQueue.Add(key)
                        }
                } else {
                        klog.V(3).Infof("enqueue delete pod %s", key)
                        c.deletingPodObjMap.Store(key, p)
                        c.deletePodQueue.Add(key)
                }
                return
        }

        need, err := c.podNeedSync(p)
        if err != nil {
                klog.Errorf("invalid pod net: %v", err)
                return
        }
        if need {
                klog.Infof("enqueue add pod %s", key)
                c.addOrUpdatePodQueue.Add(key)
        }

        if err = c.handlePodEventForVpcEgressGateway(p); err != nil {
                klog.Errorf("failed to handle pod event for vpc egress gateway: %v", err)
        }
}

func (c *Controller) enqueueDeletePod(obj any) {
        var p *v1.Pod
        switch t := obj.(type) {
        case *v1.Pod:
                p = t
        case cache.DeletedFinalStateUnknown:
                pod, ok := t.Obj.(*v1.Pod)
                if !ok {
                        klog.Warningf("unexpected object type: %T", t.Obj)
                        return
                }
                p = pod
        default:
                klog.Warningf("unexpected type: %T", obj)
                return
        }

        if p.Spec.HostNetwork {
                return
        }

        // Pod might be targeted by manual endpoints and we need to recompute its port mappings
        c.enqueueStaticEndpointUpdateInNamespace(p.Namespace)

        if c.config.EnableNP {
                c.namedPort.DeleteNamedPortByPod(p)
                for _, np := range c.podMatchNetworkPolicies(p) {
                        c.updateNpQueue.Add(np)
                }
        }

        if c.config.EnableANP {
                podNs, _ := c.namespacesLister.Get(p.Namespace)
                c.updateAnpsByLabelsMatch(podNs.Labels, p.Labels)
        }

        key := cache.MetaObjectToName(p).String()
        klog.Infof("enqueue delete pod %s", key)
        c.deletingPodObjMap.Store(key, p)
        c.deletePodQueue.Add(key)
}

func (c *Controller) enqueueUpdatePod(oldObj, newObj any) {
        oldPod := oldObj.(*v1.Pod)
        newPod := newObj.(*v1.Pod)

        // Pod might be targeted by manual endpoints and we need to recompute its port mappings
        c.enqueueStaticEndpointUpdateInNamespace(oldPod.Namespace)

        if oldPod.Annotations[util.AAPsAnnotation] != "" || newPod.Annotations[util.AAPsAnnotation] != "" {
                oldAAPs := strings.Split(oldPod.Annotations[util.AAPsAnnotation], ",")
                newAAPs := strings.Split(newPod.Annotations[util.AAPsAnnotation], ",")
                var vipNames []string
                for _, vipName := range oldAAPs {
                        vipNames = append(vipNames, strings.TrimSpace(vipName))
                }
                for _, vipName := range newAAPs {
                        vipName = strings.TrimSpace(vipName)
                        if !slices.Contains(vipNames, vipName) {
                                vipNames = append(vipNames, vipName)
                        }
                }
                for _, vipName := range vipNames {
                        if vip, err := c.virtualIpsLister.Get(vipName); err == nil {
                                if vip.Spec.Namespace != newPod.Namespace {
                                        continue
                                }
                                klog.Infof("enqueue update virtual parents for %s", vipName)
                                c.updateVirtualParentsQueue.Add(vipName)
                        }
                }
        }

        if oldPod.ResourceVersion == newPod.ResourceVersion {
                return
        }
        if newPod.Spec.HostNetwork {
                return
        }

        podNets, err := c.getPodKubeovnNets(newPod)
        if err != nil {
                klog.Errorf("failed to get newPod nets %v", err)
                return
        }

        key := cache.MetaObjectToName(newPod).String()
        if c.config.EnableNP {
                c.namedPort.AddNamedPortByPod(newPod)
                newNp := c.podMatchNetworkPolicies(newPod)
                if !maps.Equal(oldPod.Labels, newPod.Labels) {
                        oldNp := c.podMatchNetworkPolicies(oldPod)
                        for _, np := range util.DiffStringSlice(oldNp, newNp) {
                                c.updateNpQueue.Add(np)
                        }
                }

                for _, podNet := range podNets {
                        oldAllocated := oldPod.Annotations[fmt.Sprintf(util.AllocatedAnnotationTemplate, podNet.ProviderName)]
                        newAllocated := newPod.Annotations[fmt.Sprintf(util.AllocatedAnnotationTemplate, podNet.ProviderName)]
                        if oldAllocated != newAllocated {
                                for _, np := range newNp {
                                        klog.V(3).Infof("enqueue update network policy %s for pod %s", np, key)
                                        c.updateNpQueue.Add(np)
                                }
                                break
                        }
                }
        }

        if c.config.EnableANP {
                podNs, _ := c.namespacesLister.Get(newPod.Namespace)
                if !maps.Equal(oldPod.Labels, newPod.Labels) {
                        c.updateAnpsByLabelsMatch(podNs.Labels, newPod.Labels)
                }

                for _, podNet := range podNets {
                        oldAllocated := oldPod.Annotations[fmt.Sprintf(util.AllocatedAnnotationTemplate, podNet.ProviderName)]
                        newAllocated := newPod.Annotations[fmt.Sprintf(util.AllocatedAnnotationTemplate, podNet.ProviderName)]
                        if oldAllocated != newAllocated {
                                c.updateAnpsByLabelsMatch(podNs.Labels, newPod.Labels)
                                break
                        }
                }
        }

        isStateful, statefulSetName, statefulSetUID := isStatefulSetPod(newPod)
        isVMPod, vmName := isVMPod(newPod)
        if !isPodStatusPhaseAlive(newPod) && !isStateful && !isVMPod {
                klog.V(3).Infof("enqueue delete pod %s", key)
                c.deletingPodObjMap.Store(key, newPod)
                c.deletePodQueue.Add(key)
                return
        }

        // enqueue delay
        var delay time.Duration
        if newPod.Spec.TerminationGracePeriodSeconds != nil {
                if !newPod.DeletionTimestamp.IsZero() {
                        delay = time.Until(newPod.DeletionTimestamp.Add(time.Duration(*newPod.Spec.TerminationGracePeriodSeconds) * time.Second))
                } else {
                        delay = time.Duration(*newPod.Spec.TerminationGracePeriodSeconds) * time.Second
                }
        }

        if !newPod.DeletionTimestamp.IsZero() && !isStateful && !isVMPod {
                go func() {
                        // In case node get lost and pod can not be deleted,
                        // the ip address will not be recycled
                        klog.V(3).Infof("enqueue delete pod %s after %v", key, delay)
                        c.deletingPodObjMap.Store(key, newPod)
                        c.deletePodQueue.AddAfter(key, delay)
                }()
                return
        }

        if err = c.handlePodEventForVpcEgressGateway(newPod); err != nil {
                klog.Errorf("failed to handle pod event for vpc egress gateway: %v", err)
        }

        // do not delete statefulset pod unless ownerReferences is deleted
        if isStateful && isStatefulSetPodToDel(c.config.KubeClient, newPod, statefulSetName, statefulSetUID) {
                go func() {
                        klog.V(3).Infof("enqueue delete pod %s after %v", key, delay)
                        c.deletingPodObjMap.Store(key, newPod)
                        c.deletePodQueue.AddAfter(key, delay)
                }()
                return
        }
        if isVMPod && c.isVMToDel(newPod, vmName) {
                go func() {
                        klog.V(3).Infof("enqueue delete pod %s after %v", key, delay)
                        c.deletingPodObjMap.Store(key, newPod)
                        c.deletePodQueue.AddAfter(key, delay)
                }()
                return
        }
        klog.Infof("enqueue update pod %s", key)
        c.addOrUpdatePodQueue.Add(key)

        // security policy changed
        for _, podNet := range podNets {
                oldSecurity := oldPod.Annotations[fmt.Sprintf(util.PortSecurityAnnotationTemplate, podNet.ProviderName)]
                newSecurity := newPod.Annotations[fmt.Sprintf(util.PortSecurityAnnotationTemplate, podNet.ProviderName)]
                oldSg := oldPod.Annotations[fmt.Sprintf(util.SecurityGroupAnnotationTemplate, podNet.ProviderName)]
                newSg := newPod.Annotations[fmt.Sprintf(util.SecurityGroupAnnotationTemplate, podNet.ProviderName)]
                oldVips := oldPod.Annotations[fmt.Sprintf(util.PortVipAnnotationTemplate, podNet.ProviderName)]
                newVips := newPod.Annotations[fmt.Sprintf(util.PortVipAnnotationTemplate, podNet.ProviderName)]
                oldAAPs := oldPod.Annotations[util.AAPsAnnotation]
                newAAPs := newPod.Annotations[util.AAPsAnnotation]
                if oldSecurity != newSecurity || oldSg != newSg || oldVips != newVips || oldAAPs != newAAPs {
                        c.updatePodSecurityQueue.Add(key)
                        break
                }
        }
}

func (c *Controller) getPodKubeovnNets(pod *v1.Pod) ([]*kubeovnNet, error) {
        attachmentNets, err := c.getPodAttachmentNet(pod)
        if err != nil {
                klog.Error(err)
                return nil, err
        }

        podNets := attachmentNets
        // When Kube-OVN is run as non-primary CNI, we do not add default network configuration to pod.
        // We only add network attachment defined by the user to pod.
        if c.config.EnableNonPrimaryCNI {
                return podNets, nil
        }

        defaultSubnet, err := c.getPodDefaultSubnet(pod)
        if err != nil {
                klog.Error(err)
                return nil, err
        }

        // pod annotation default subnet not found
        if defaultSubnet == nil {
                klog.Errorf("pod %s/%s has no default subnet, skip adding default network", pod.Namespace, pod.Name)
                return attachmentNets, nil
        }

        if _, hasOtherDefaultNet := pod.Annotations[util.DefaultNetworkAnnotation]; !hasOtherDefaultNet {
                podNets = append(attachmentNets, &kubeovnNet{
                        Type:         providerTypeOriginal,
                        ProviderName: util.OvnProvider,
                        Subnet:       defaultSubnet,
                        IsDefault:    true,
                })
        }

        return podNets, nil
}

func (c *Controller) handleAddOrUpdatePod(key string) (err error) {
        now := time.Now()
        klog.Infof("handle add/update pod %s", key)

        namespace, name, err := cache.SplitMetaNamespaceKey(key)
        if err != nil {
                utilruntime.HandleError(fmt.Errorf("invalid resource key: %s", key))
                return nil
        }

        c.podKeyMutex.LockKey(key)
        defer func() {
                _ = c.podKeyMutex.UnlockKey(key)
                last := time.Since(now)
                klog.Infof("take %d ms to handle add or update pod %s", last.Milliseconds(), key)
        }()

        pod, err := c.podsLister.Pods(namespace).Get(name)
        if err != nil {
                if k8serrors.IsNotFound(err) {
                        return nil
                }
                klog.Error(err)
                return err
        }
        if err := util.ValidatePodNetwork(pod.Annotations); err != nil {
                klog.Errorf("validate pod %s/%s failed: %v", namespace, name, err)
                c.recorder.Eventf(pod, v1.EventTypeWarning, "ValidatePodNetworkFailed", err.Error())
                return err
        }

        podNets, err := c.getPodKubeovnNets(pod)
        if err != nil {
                klog.Errorf("failed to get pod nets %v", err)
                return err
        }

        // check and do hotnoplug nic
        if pod, err = c.syncKubeOvnNet(pod, podNets); err != nil {
                klog.Errorf("failed to sync pod nets %v", err)
                return err
        }
        if pod == nil {
                // pod has been deleted
                return nil
        }
        needAllocatePodNets := needAllocateSubnets(pod, podNets)
        if len(needAllocatePodNets) != 0 {
                if pod, err = c.reconcileAllocateSubnets(pod, needAllocatePodNets); err != nil {
                        klog.Error(err)
                        return err
                }
                if pod == nil {
                        // pod has been deleted
                        return nil
                }
        }

        isVpcNatGw, vpcGwName := c.checkIsPodVpcNatGw(pod)
        if isVpcNatGw {
                if needRestartNatGatewayPod(pod) {
                        klog.Infof("restarting vpc nat gateway %s", vpcGwName)
                        c.addOrUpdateVpcNatGatewayQueue.Add(vpcGwName)
                }
        }

        // check if route subnet is need.
        return c.reconcileRouteSubnets(pod, needRouteSubnets(pod, podNets))
}

// do the same thing as add pod
func (c *Controller) reconcileAllocateSubnets(pod *v1.Pod, needAllocatePodNets []*kubeovnNet) (*v1.Pod, error) {
        namespace := pod.Namespace
        name := pod.Name
        klog.Infof("sync pod %s/%s allocated", namespace, name)

        vipsMap := c.getVirtualIPs(pod, needAllocatePodNets)
        isVMPod, vmName := isVMPod(pod)
        podType := getPodType(pod)
        podName := c.getNameByPod(pod)
        // todo: isVmPod, getPodType, getNameByPod has duplicated logic

        var err error
        var vmKey string
        if isVMPod && c.config.EnableKeepVMIP {
                vmKey = fmt.Sprintf("%s/%s", namespace, vmName)
        }
        // Avoid create lsp for already running pod in ovn-nb when controller restart
        patch := util.KVPatch{}
        for _, podNet := range needAllocatePodNets {
                // the subnet may changed when alloc static ip from the latter subnet after ns supports multi subnets
                v4IP, v6IP, mac, subnet, err := c.acquireAddress(pod, podNet)
                if err != nil {
                        c.recorder.Eventf(pod, v1.EventTypeWarning, "AcquireAddressFailed", err.Error())
                        klog.Error(err)
                        return nil, err
                }
                ipStr := util.GetStringIP(v4IP, v6IP)
                patch[fmt.Sprintf(util.IPAddressAnnotationTemplate, podNet.ProviderName)] = ipStr
                if mac == "" {
                        patch[fmt.Sprintf(util.MacAddressAnnotationTemplate, podNet.ProviderName)] = nil
                } else {
                        patch[fmt.Sprintf(util.MacAddressAnnotationTemplate, podNet.ProviderName)] = mac
                }
                patch[fmt.Sprintf(util.CidrAnnotationTemplate, podNet.ProviderName)] = subnet.Spec.CIDRBlock
                patch[fmt.Sprintf(util.GatewayAnnotationTemplate, podNet.ProviderName)] = subnet.Spec.Gateway
                if isOvnSubnet(podNet.Subnet) {
                        patch[fmt.Sprintf(util.LogicalSwitchAnnotationTemplate, podNet.ProviderName)] = subnet.Name
                        if pod.Annotations[fmt.Sprintf(util.PodNicAnnotationTemplate, podNet.ProviderName)] == "" {
                                patch[fmt.Sprintf(util.PodNicAnnotationTemplate, podNet.ProviderName)] = c.config.PodNicType
                        }
                } else {
                        patch[fmt.Sprintf(util.LogicalSwitchAnnotationTemplate, podNet.ProviderName)] = nil
                        patch[fmt.Sprintf(util.PodNicAnnotationTemplate, podNet.ProviderName)] = nil
                }
                patch[fmt.Sprintf(util.AllocatedAnnotationTemplate, podNet.ProviderName)] = "true"
                if vmKey != "" {
                        patch[fmt.Sprintf(util.VMAnnotationTemplate, podNet.ProviderName)] = vmName
                }
                if err := util.ValidateNetworkBroadcast(podNet.Subnet.Spec.CIDRBlock, ipStr); err != nil {
                        klog.Errorf("validate pod %s/%s failed: %v", namespace, name, err)
                        c.recorder.Eventf(pod, v1.EventTypeWarning, "ValidatePodNetworkFailed", err.Error())
                        return nil, err
                }

                if podNet.Type != providerTypeIPAM {
                        if (subnet.Spec.Vlan == "" || subnet.Spec.LogicalGateway || subnet.Spec.U2OInterconnection) && subnet.Spec.Vpc != "" {
                                patch[fmt.Sprintf(util.LogicalRouterAnnotationTemplate, podNet.ProviderName)] = subnet.Spec.Vpc
                        }

                        if subnet.Spec.Vlan != "" {
                                vlan, err := c.vlansLister.Get(subnet.Spec.Vlan)
                                if err != nil {
                                        klog.Error(err)
                                        c.recorder.Eventf(pod, v1.EventTypeWarning, "GetVlanInfoFailed", err.Error())
                                        return nil, err
                                }
                                patch[fmt.Sprintf(util.VlanIDAnnotationTemplate, podNet.ProviderName)] = strconv.Itoa(vlan.Spec.ID)
                                patch[fmt.Sprintf(util.ProviderNetworkTemplate, podNet.ProviderName)] = vlan.Spec.Provider
                        }

                        portSecurity := false
                        if pod.Annotations[fmt.Sprintf(util.PortSecurityAnnotationTemplate, podNet.ProviderName)] == "true" {
                                portSecurity = true
                        }

                        vips := vipsMap[fmt.Sprintf("%s.%s", podNet.Subnet.Name, podNet.ProviderName)]
                        for ip := range strings.SplitSeq(vips, ",") {
                                if ip != "" && net.ParseIP(ip) == nil {
                                        klog.Errorf("invalid vip address '%s' for pod %s", ip, name)
                                        vips = ""
                                        break
                                }
                        }

                        portName := ovs.PodNameToPortName(podName, namespace, podNet.ProviderName)
                        dhcpOptions := &ovs.DHCPOptionsUUIDs{
                                DHCPv4OptionsUUID: subnet.Status.DHCPv4OptionsUUID,
                                DHCPv6OptionsUUID: subnet.Status.DHCPv6OptionsUUID,
                        }

                        var oldSgList []string
                        if vmKey != "" {
                                existingLsp, err := c.OVNNbClient.GetLogicalSwitchPort(portName, true)
                                if err != nil {
                                        klog.Errorf("failed to get logical switch port %s: %v", portName, err)
                                        return nil, err
                                }
                                if existingLsp != nil {
                                        oldSgList, _ = c.getPortSg(existingLsp)
                                }
                        }

                        securityGroupAnnotation := pod.Annotations[fmt.Sprintf(util.SecurityGroupAnnotationTemplate, podNet.ProviderName)]
                        if err := c.OVNNbClient.CreateLogicalSwitchPort(subnet.Name, portName, ipStr, mac, podName, pod.Namespace,
                                portSecurity, securityGroupAnnotation, vips, podNet.Subnet.Spec.EnableDHCP, dhcpOptions, subnet.Spec.Vpc); err != nil {
                                c.recorder.Eventf(pod, v1.EventTypeWarning, "CreateOVNPortFailed", err.Error())
                                klog.Errorf("%v", err)
                                return nil, err
                        }

                        if pod.Annotations[fmt.Sprintf(util.Layer2ForwardAnnotationTemplate, podNet.ProviderName)] == "true" {
                                if err := c.OVNNbClient.EnablePortLayer2forward(portName); err != nil {
                                        c.recorder.Eventf(pod, v1.EventTypeWarning, "SetOVNPortL2ForwardFailed", err.Error())
                                        klog.Errorf("%v", err)
                                        return nil, err
                                }
                        }

                        if securityGroupAnnotation != "" || oldSgList != nil {
                                securityGroups := strings.ReplaceAll(securityGroupAnnotation, " ", "")
                                newSgList := strings.Split(securityGroups, ",")
                                sgNames := util.UnionStringSlice(oldSgList, newSgList)
                                for _, sgName := range sgNames {
                                        if sgName != "" {
                                                c.syncSgPortsQueue.Add(sgName)
                                        }
                                }
                        }

                        if vips != "" {
                                c.syncVirtualPortsQueue.Add(podNet.Subnet.Name)
                        }
                }
                // CreatePort may fail, so put ip CR creation after CreatePort
                ipCRName := ovs.PodNameToPortName(podName, pod.Namespace, podNet.ProviderName)
                if err := c.createOrUpdateIPCR(ipCRName, podName, ipStr, mac, subnet.Name, pod.Namespace, pod.Spec.NodeName, podType); err != nil {
                        err = fmt.Errorf("failed to create ips CR %s.%s: %w", podName, pod.Namespace, err)
                        klog.Error(err)
                        return nil, err
                }
        }
        if err = util.PatchAnnotations(c.config.KubeClient.CoreV1().Pods(namespace), name, patch); err != nil {
                if k8serrors.IsNotFound(err) {
                        // Sometimes pod is deleted between kube-ovn configure ovn-nb and patch pod.
                        // Then we need to recycle the resource again.
                        key := strings.Join([]string{namespace, name}, "/")
                        c.deletingPodObjMap.Store(key, pod)
                        c.deletePodQueue.AddRateLimited(key)
                        return nil, nil
                }
                klog.Errorf("failed to patch pod %s/%s: %v", namespace, name, err)
                return nil, err
        }

        if pod, err = c.config.KubeClient.CoreV1().Pods(namespace).Get(context.TODO(), name, metav1.GetOptions{}); err != nil {
                if k8serrors.IsNotFound(err) {
                        key := strings.Join([]string{namespace, name}, "/")
                        c.deletingPodObjMap.Store(key, pod)
                        c.deletePodQueue.AddRateLimited(key)
                        return nil, nil
                }
                klog.Errorf("failed to get pod %s/%s: %v", namespace, name, err)
                return nil, err
        }

        // Check if pod is a vpc nat gateway. Annotation set will have subnet provider name as prefix
        isVpcNatGw, vpcGwName := c.checkIsPodVpcNatGw(pod)
        if isVpcNatGw {
                klog.Infof("init vpc nat gateway pod %s/%s with name %s", namespace, name, vpcGwName)
                c.initVpcNatGatewayQueue.Add(vpcGwName)
        }

        return pod, nil
}

// do the same thing as update pod
func (c *Controller) reconcileRouteSubnets(pod *v1.Pod, needRoutePodNets []*kubeovnNet) error {
        // the lb-svc pod has dependencies on Running state, check it when pod state get updated
        if err := c.checkAndReInitLbSvcPod(pod); err != nil {
                klog.Errorf("failed to init iptable rules for load-balancer pod %s/%s: %v", pod.Namespace, pod.Name, err)
        }

        if len(needRoutePodNets) == 0 {
                return nil
        }

        namespace := pod.Namespace
        name := pod.Name
        podName := c.getNameByPod(pod)

        klog.Infof("sync pod %s/%s routed", namespace, name)

        node, err := c.nodesLister.Get(pod.Spec.NodeName)
        if err != nil {
                klog.Errorf("failed to get node %s: %v", pod.Spec.NodeName, err)
                return err
        }

        portGroups, err := c.OVNNbClient.ListPortGroups(map[string]string{"node": "", networkPolicyKey: ""})
        if err != nil {
                klog.Errorf("failed to list port groups: %v", err)
                return err
        }

        var nodePortGroups []string
        nodePortGroup := strings.ReplaceAll(node.Annotations[util.PortNameAnnotation], "-", ".")
        for _, pg := range portGroups {
                if pg.Name != nodePortGroup && pg.ExternalIDs["subnet"] == "" {
                        nodePortGroups = append(nodePortGroups, pg.Name)
                }
        }

        var podIP string
        var subnet *kubeovnv1.Subnet
        patch := util.KVPatch{}
        for _, podNet := range needRoutePodNets {
                // in case update handler overlap the annotation when cache is not in sync
                if pod.Annotations[fmt.Sprintf(util.AllocatedAnnotationTemplate, podNet.ProviderName)] == "" {
                        return fmt.Errorf("no address has been allocated to %s/%s", namespace, name)
                }

                podIP = pod.Annotations[fmt.Sprintf(util.IPAddressAnnotationTemplate, podNet.ProviderName)]
                subnet = podNet.Subnet

                // Check if pod uses nodeSwitch subnet
                if subnet.Name == c.config.NodeSwitch {
                        return fmt.Errorf("NodeSwitch subnet %s is unavailable for pod", subnet.Name)
                }

                if portGroups, err = c.OVNNbClient.ListPortGroups(map[string]string{"subnet": subnet.Name, "node": "", networkPolicyKey: ""}); err != nil {
                        klog.Errorf("failed to list port groups: %v", err)
                        return err
                }

                pgName := getOverlaySubnetsPortGroupName(subnet.Name, pod.Spec.NodeName)
                portName := ovs.PodNameToPortName(podName, pod.Namespace, podNet.ProviderName)
                subnetPortGroups := make([]string, 0, len(portGroups))
                for _, pg := range portGroups {
                        if pg.Name != pgName {
                                subnetPortGroups = append(subnetPortGroups, pg.Name)
                        }
                }

                if (!c.config.EnableLb || (subnet.Spec.EnableLb == nil || !*subnet.Spec.EnableLb)) &&
                        subnet.Spec.Vpc == c.config.ClusterRouter &&
                        subnet.Spec.U2OInterconnection &&
                        subnet.Spec.Vlan != "" &&
                        !subnet.Spec.LogicalGateway {
                        // remove lsp from other port groups
                        // we need to do this because the pod, e.g. a sts/vm, can be rescheduled to another node
                        if err = c.OVNNbClient.RemovePortFromPortGroups(portName, subnetPortGroups...); err != nil {
                                klog.Errorf("failed to remove port %s from port groups %v: %v", portName, subnetPortGroups, err)
                                return err
                        }
                        // add lsp to the port group
                        if err := c.OVNNbClient.PortGroupAddPorts(pgName, portName); err != nil {
                                klog.Errorf("failed to add port to u2o port group %s: %v", pgName, err)
                                return err
                        }
                }

                if podIP != "" && (subnet.Spec.Vlan == "" || subnet.Spec.LogicalGateway) && subnet.Spec.Vpc == c.config.ClusterRouter {
                        node, err := c.nodesLister.Get(pod.Spec.NodeName)
                        if err != nil {
                                klog.Errorf("failed to get node %s: %v", pod.Spec.NodeName, err)
                                return err
                        }

                        // remove lsp from other port groups
                        // we need to do this because the pod, e.g. a sts/vm, can be rescheduled to another node
                        if err = c.OVNNbClient.RemovePortFromPortGroups(portName, nodePortGroups...); err != nil {
                                klog.Errorf("failed to remove port %s from port groups %v: %v", portName, nodePortGroups, err)
                                return err
                        }
                        // add lsp to the port group
                        if err = c.OVNNbClient.PortGroupAddPorts(nodePortGroup, portName); err != nil {
                                klog.Errorf("failed to add port %s to port group %s: %v", portName, nodePortGroup, err)
                                return err
                        }

                        if c.config.EnableEipSnat && (pod.Annotations[util.EipAnnotation] != "" || pod.Annotations[util.SnatAnnotation] != "") {
                                cm, err := c.configMapsLister.ConfigMaps(c.config.ExternalGatewayConfigNS).Get(util.ExternalGatewayConfig)
                                if err != nil {
                                        klog.Errorf("failed to get ex-gateway config, %v", err)
                                        return err
                                }
                                nextHop := cm.Data["external-gw-addr"]
                                if nextHop == "" {
                                        externalSubnet, err := c.subnetsLister.Get(c.config.ExternalGatewaySwitch)
                                        if err != nil {
                                                klog.Errorf("failed to get subnet %s, %v", c.config.ExternalGatewaySwitch, err)
                                                return err
                                        }
                                        nextHop = externalSubnet.Spec.Gateway
                                        if nextHop == "" {
                                                klog.Errorf("no available gateway address")
                                                return errors.New("no available gateway address")
                                        }
                                }
                                if strings.Contains(nextHop, "/") {
                                        nextHop = strings.Split(nextHop, "/")[0]
                                }

                                if err := c.addPolicyRouteToVpc(
                                        subnet.Spec.Vpc,
                                        &kubeovnv1.PolicyRoute{
                                                Priority:  util.NorthGatewayRoutePolicyPriority,
                                                Match:     "ip4.src == " + podIP,
                                                Action:    kubeovnv1.PolicyRouteActionReroute,
                                                NextHopIP: nextHop,
                                        },
                                        map[string]string{
                                                "vendor": util.CniTypeName,
                                                "subnet": subnet.Name,
                                        },
                                ); err != nil {
                                        klog.Errorf("failed to add policy route, %v", err)
                                        return err
                                }

                                // remove lsp from port group to make EIP/SNAT work
                                if err = c.OVNNbClient.PortGroupRemovePorts(pgName, portName); err != nil {
                                        klog.Error(err)
                                        return err
                                }
                        } else {
                                if subnet.Spec.GatewayType == kubeovnv1.GWDistributedType && pod.Annotations[util.NorthGatewayAnnotation] == "" {
                                        nodeTunlIPAddr, err := getNodeTunlIP(node)
                                        if err != nil {
                                                klog.Error(err)
                                                return err
                                        }

                                        var added bool
                                        for _, nodeAddr := range nodeTunlIPAddr {
                                                for podAddr := range strings.SplitSeq(podIP, ",") {
                                                        if util.CheckProtocol(nodeAddr.String()) != util.CheckProtocol(podAddr) {
                                                                continue
                                                        }

                                                        // remove lsp from other port groups
                                                        // we need to do this because the pod, e.g. a sts/vm, can be rescheduled to another node
                                                        if err = c.OVNNbClient.RemovePortFromPortGroups(portName, subnetPortGroups...); err != nil {
                                                                klog.Errorf("failed to remove port %s from port groups %v: %v", portName, subnetPortGroups, err)
                                                                return err
                                                        }
                                                        if err := c.OVNNbClient.PortGroupAddPorts(pgName, portName); err != nil {
                                                                klog.Errorf("failed to add port %s to port group %s: %v", portName, pgName, err)
                                                                return err
                                                        }

                                                        added = true
                                                        break
                                                }
                                                if added {
                                                        break
                                                }
                                        }
                                }

                                if pod.Annotations[util.NorthGatewayAnnotation] != "" && pod.Annotations[util.IPAddressAnnotation] != "" {
                                        for podAddr := range strings.SplitSeq(pod.Annotations[util.IPAddressAnnotation], ",") {
                                                if util.CheckProtocol(podAddr) != util.CheckProtocol(pod.Annotations[util.NorthGatewayAnnotation]) {
                                                        continue
                                                }
                                                ipSuffix := "ip4"
                                                if util.CheckProtocol(podAddr) == kubeovnv1.ProtocolIPv6 {
                                                        ipSuffix = "ip6"
                                                }

                                                if err := c.addPolicyRouteToVpc(
                                                        subnet.Spec.Vpc,
                                                        &kubeovnv1.PolicyRoute{
                                                                Priority:  util.NorthGatewayRoutePolicyPriority,
                                                                Match:     fmt.Sprintf("%s.src == %s", ipSuffix, podAddr),
                                                                Action:    kubeovnv1.PolicyRouteActionReroute,
                                                                NextHopIP: pod.Annotations[util.NorthGatewayAnnotation],
                                                        },
                                                        map[string]string{
                                                                "vendor": util.CniTypeName,
                                                                "subnet": subnet.Name,
                                                        },
                                                ); err != nil {
                                                        klog.Errorf("failed to add policy route, %v", err)
                                                        return err
                                                }
                                        }
                                } else if c.config.EnableEipSnat {
                                        if err = c.deleteStaticRouteFromVpc(
                                                c.config.ClusterRouter,
                                                subnet.Spec.RouteTable,
                                                podIP,
                                                "",
                                                kubeovnv1.PolicyDst,
                                        ); err != nil {
                                                klog.Error(err)
                                                return err
                                        }
                                }
                        }

                        if c.config.EnableEipSnat {
                                for ipStr := range strings.SplitSeq(podIP, ",") {
                                        if eip := pod.Annotations[util.EipAnnotation]; eip == "" {
                                                if err = c.OVNNbClient.DeleteNats(c.config.ClusterRouter, ovnnb.NATTypeDNATAndSNAT, ipStr); err != nil {
                                                        klog.Errorf("failed to delete nat rules: %v", err)
                                                }
                                        } else if util.CheckProtocol(eip) == util.CheckProtocol(ipStr) {
                                                if err = c.OVNNbClient.UpdateDnatAndSnat(c.config.ClusterRouter, eip, ipStr, fmt.Sprintf("%s.%s", podName, pod.Namespace), pod.Annotations[util.MacAddressAnnotation], c.ExternalGatewayType); err != nil {
                                                        klog.Errorf("failed to add nat rules, %v", err)
                                                        return err
                                                }
                                        }
                                        if eip := pod.Annotations[util.SnatAnnotation]; eip == "" {
                                                if err = c.OVNNbClient.DeleteNats(c.config.ClusterRouter, ovnnb.NATTypeSNAT, ipStr); err != nil {
                                                        klog.Errorf("failed to delete nat rules: %v", err)
                                                }
                                        } else if util.CheckProtocol(eip) == util.CheckProtocol(ipStr) {
                                                if err = c.OVNNbClient.UpdateSnat(c.config.ClusterRouter, eip, ipStr); err != nil {
                                                        klog.Errorf("failed to add nat rules, %v", err)
                                                        return err
                                                }
                                        }
                                }
                        }
                }

                if pod.Annotations[fmt.Sprintf(util.ActivationStrategyTemplate, podNet.ProviderName)] != "" {
                        if err := c.OVNNbClient.SetLogicalSwitchPortActivationStrategy(portName, pod.Spec.NodeName); err != nil {
                                klog.Errorf("failed to set activation strategy for lsp %s: %v", portName, err)
                                return err
                        }
                }

                patch[fmt.Sprintf(util.RoutedAnnotationTemplate, podNet.ProviderName)] = "true"
        }
        if err := util.PatchAnnotations(c.config.KubeClient.CoreV1().Pods(namespace), name, patch); err != nil {
                if k8serrors.IsNotFound(err) {
                        // Sometimes pod is deleted between kube-ovn configure ovn-nb and patch pod.
                        // Then we need to recycle the resource again.
                        key := strings.Join([]string{namespace, name}, "/")
                        c.deletingPodObjMap.Store(key, pod)
                        c.deletePodQueue.AddRateLimited(key)
                        return nil
                }
                klog.Errorf("failed to patch pod %s/%s: %v", namespace, name, err)
                return err
        }
        return nil
}

func (c *Controller) handleDeletePod(key string) (err error) {
        pod, ok := c.deletingPodObjMap.Load(key)
        if !ok {
                return nil
        }
        now := time.Now()
        klog.Infof("handle delete pod %s", key)
        podName := c.getNameByPod(pod)
        c.podKeyMutex.LockKey(key)
        defer func() {
                _ = c.podKeyMutex.UnlockKey(key)
                if err == nil {
                        c.deletingPodObjMap.Delete(key)
                }
                last := time.Since(now)
                klog.Infof("take %d ms to handle delete pod %s", last.Milliseconds(), key)
        }()

        p, _ := c.podsLister.Pods(pod.Namespace).Get(pod.Name)
        if p != nil && p.UID != pod.UID {
                // Pod with same name exists, just return here
                return nil
        }

        if aaps := pod.Annotations[util.AAPsAnnotation]; aaps != "" {
                for vipName := range strings.SplitSeq(aaps, ",") {
                        if vip, err := c.virtualIpsLister.Get(vipName); err == nil {
                                if vip.Spec.Namespace != pod.Namespace {
                                        continue
                                }
                                klog.Infof("enqueue update virtual parents for %s", vipName)
                                c.updateVirtualParentsQueue.Add(vipName)
                        }
                }
        }

        podKey := fmt.Sprintf("%s/%s", pod.Namespace, podName)

        var keepIPCR bool
        if ok, stsName, stsUID := isStatefulSetPod(pod); ok {
                if !pod.DeletionTimestamp.IsZero() {
                        klog.Infof("handle deletion of sts pod %s", podKey)
                        toDel := isStatefulSetPodToDel(c.config.KubeClient, pod, stsName, stsUID)
                        if !toDel {
                                klog.Infof("try keep ip for sts pod %s", podKey)
                                keepIPCR = true
                        }
                }
                if keepIPCR {
                        isDelete, err := appendCheckPodToDel(c, pod, stsName, util.StatefulSet)
                        if err != nil {
                                klog.Error(err)
                                return err
                        }
                        if isDelete {
                                klog.Infof("not keep ip for sts pod %s", podKey)
                                keepIPCR = false
                        }
                }
        }
        isVMPod, vmName := isVMPod(pod)
        if isVMPod && c.config.EnableKeepVMIP {
                ports, err := c.OVNNbClient.ListNormalLogicalSwitchPorts(true, map[string]string{"pod": podKey})
                if err != nil {
                        klog.Errorf("failed to list lsps of pod %s: %v", podKey, err)
                        return err
                }
                for _, port := range ports {
                        if err := c.OVNNbClient.CleanLogicalSwitchPortMigrateOptions(port.Name); err != nil {
                                err = fmt.Errorf("failed to clean migrate options for vm lsp %s, %w", port.Name, err)
                                klog.Error(err)
                                return err
                        }
                }
                if pod.DeletionTimestamp != nil {
                        klog.Infof("handle deletion of vm pod %s", podKey)
                        vmToBeDel := c.isVMToDel(pod, vmName)
                        if !vmToBeDel {
                                klog.Infof("try keep ip for vm pod %s", podKey)
                                keepIPCR = true
                        }
                }
                if keepIPCR {
                        isDelete, err := appendCheckPodToDel(c, pod, vmName, util.VMInstance)
                        if err != nil {
                                klog.Error(err)
                                return err
                        }
                        if isDelete {
                                klog.Infof("not keep ip for vm pod %s", podKey)
                                keepIPCR = false
                        }
                }
        }

        podNets, err := c.getPodKubeovnNets(pod)
        if err != nil {
                klog.Errorf("failed to get kube-ovn nets of pod %s: %v", podKey, err)
        }
        ports, err := c.OVNNbClient.ListNormalLogicalSwitchPorts(true, map[string]string{"pod": podKey})
        if err != nil {
                klog.Errorf("failed to list lsps of pod %s: %v", podKey, err)
                return err
        }
        if keepIPCR {
                // always remove lsp from port groups
                for _, port := range ports {
                        klog.Infof("remove lsp %s from all port groups", port.Name)
                        if err = c.OVNNbClient.RemovePortFromPortGroups(port.Name); err != nil {
                                klog.Errorf("failed to remove lsp %s from all port groups: %v", port.Name, err)
                                return err
                        }
                }
        } else {
                if len(ports) != 0 {
                        addresses := c.ipam.GetPodAddress(podKey)
                        for _, address := range addresses {
                                if strings.TrimSpace(address.IP) == "" {
                                        continue
                                }
                                subnet, err := c.subnetsLister.Get(address.Subnet.Name)
                                if k8serrors.IsNotFound(err) {
                                        continue
                                } else if err != nil {
                                        klog.Error(err)
                                        return err
                                }
                                vpc, err := c.vpcsLister.Get(subnet.Spec.Vpc)
                                if k8serrors.IsNotFound(err) {
                                        continue
                                } else if err != nil {
                                        klog.Error(err)
                                        return err
                                }

                                ipSuffix := "ip4"
                                if util.CheckProtocol(address.IP) == kubeovnv1.ProtocolIPv6 {
                                        ipSuffix = "ip6"
                                }
                                if err = c.deletePolicyRouteFromVpc(
                                        vpc.Name,
                                        util.NorthGatewayRoutePolicyPriority,
                                        fmt.Sprintf("%s.src == %s", ipSuffix, address.IP),
                                ); err != nil {
                                        klog.Errorf("failed to delete static route, %v", err)
                                        return err
                                }

                                if c.config.EnableEipSnat {
                                        if pod.Annotations[util.EipAnnotation] != "" {
                                                if err = c.OVNNbClient.DeleteNat(c.config.ClusterRouter, ovnnb.NATTypeDNATAndSNAT, pod.Annotations[util.EipAnnotation], address.IP); err != nil {
                                                        klog.Errorf("failed to delete nat rules: %v", err)
                                                }
                                        }
                                        if pod.Annotations[util.SnatAnnotation] != "" {
                                                if err = c.OVNNbClient.DeleteNat(c.config.ClusterRouter, ovnnb.NATTypeSNAT, "", address.IP); err != nil {
                                                        klog.Errorf("failed to delete nat rules: %v", err)
                                                }
                                        }
                                }
                        }
                }
                for _, port := range ports {
                        // when lsp is deleted, the port of pod is deleted from any port-group automatically.
                        klog.Infof("delete logical switch port %s", port.Name)
                        if err := c.OVNNbClient.DeleteLogicalSwitchPort(port.Name); err != nil {
                                klog.Errorf("failed to delete lsp %s, %v", port.Name, err)
                                return err
                        }
                }
                klog.Infof("try release all ip address for deleting pod %s", podKey)
                for _, podNet := range podNets {
                        portName := ovs.PodNameToPortName(podName, pod.Namespace, podNet.ProviderName)
                        ipCR, err := c.ipsLister.Get(portName)
                        if err != nil {
                                if k8serrors.IsNotFound(err) {
                                        continue
                                }
                                klog.Errorf("failed to get ip %s, %v", portName, err)
                                return err
                        }
                        if ipCR.Labels[util.IPReservedLabel] != "true" {
                                klog.Infof("delete ip CR %s", ipCR.Name)
                                if err := c.config.KubeOvnClient.KubeovnV1().IPs().Delete(context.Background(), ipCR.Name, metav1.DeleteOptions{}); err != nil {
                                        if !k8serrors.IsNotFound(err) {
                                                klog.Errorf("failed to delete ip %s, %v", ipCR.Name, err)
                                                return err
                                        }
                                }
                                // release ipam address after delete ip CR
                                c.ipam.ReleaseAddressByNic(podKey, portName, podNet.Subnet.Name)
                        }
                }
                if pod.Annotations[util.VipAnnotation] != "" {
                        if err = c.releaseVip(pod.Annotations[util.VipAnnotation]); err != nil {
                                klog.Errorf("failed to clean label from vip %s, %v", pod.Annotations[util.VipAnnotation], err)
                                return err
                        }
                }
        }
        for _, podNet := range podNets {
                c.syncVirtualPortsQueue.Add(podNet.Subnet.Name)
                securityGroupAnnotation := pod.Annotations[fmt.Sprintf(util.SecurityGroupAnnotationTemplate, podNet.ProviderName)]
                if securityGroupAnnotation != "" {
                        securityGroups := strings.ReplaceAll(securityGroupAnnotation, " ", "")
                        for sgName := range strings.SplitSeq(securityGroups, ",") {
                                if sgName != "" {
                                        c.syncSgPortsQueue.Add(sgName)
                                }
                        }
                }
        }
        return nil
}

func (c *Controller) handleUpdatePodSecurity(key string) error {
        now := time.Now()
        klog.Infof("handle add/update pod security group %s", key)

        namespace, name, err := cache.SplitMetaNamespaceKey(key)
        if err != nil {
                utilruntime.HandleError(fmt.Errorf("invalid resource key: %s", key))
                return nil
        }

        c.podKeyMutex.LockKey(key)
        defer func() {
                _ = c.podKeyMutex.UnlockKey(key)
                last := time.Since(now)
                klog.Infof("take %d ms to handle sg for pod %s", last.Milliseconds(), key)
        }()

        pod, err := c.podsLister.Pods(namespace).Get(name)
        if err != nil {
                if k8serrors.IsNotFound(err) {
                        return nil
                }
                klog.Error(err)
                return err
        }
        podName := c.getNameByPod(pod)

        podNets, err := c.getPodKubeovnNets(pod)
        if err != nil {
                klog.Errorf("failed to pod nets %v", err)
                return err
        }

        vipsMap := c.getVirtualIPs(pod, podNets)

        // associated with security group
        for _, podNet := range podNets {
                portSecurity := false
                if pod.Annotations[fmt.Sprintf(util.PortSecurityAnnotationTemplate, podNet.ProviderName)] == "true" {
                        portSecurity = true
                }

                mac := pod.Annotations[fmt.Sprintf(util.MacAddressAnnotationTemplate, podNet.ProviderName)]
                ipStr := pod.Annotations[fmt.Sprintf(util.IPAddressAnnotationTemplate, podNet.ProviderName)]
                vips := vipsMap[fmt.Sprintf("%s.%s", podNet.Subnet.Name, podNet.ProviderName)]
                portName := ovs.PodNameToPortName(podName, namespace, podNet.ProviderName)
                if err = c.OVNNbClient.SetLogicalSwitchPortSecurity(portSecurity, portName, mac, ipStr, vips); err != nil {
                        klog.Errorf("failed to set security for logical switch port %s: %v", portName, err)
                        return err
                }

                c.syncVirtualPortsQueue.Add(podNet.Subnet.Name)
                securityGroupAnnotation := pod.Annotations[fmt.Sprintf(util.SecurityGroupAnnotationTemplate, podNet.ProviderName)]
                var securityGroups string
                if securityGroupAnnotation != "" {
                        securityGroups = strings.ReplaceAll(securityGroupAnnotation, " ", "")
                        for sgName := range strings.SplitSeq(securityGroups, ",") {
                                if sgName != "" {
                                        c.syncSgPortsQueue.Add(sgName)
                                }
                        }
                }
                if err = c.reconcilePortSg(portName, securityGroups); err != nil {
                        klog.Errorf("reconcilePortSg failed. %v", err)
                        return err
                }
        }
        return nil
}

func (c *Controller) syncKubeOvnNet(pod *v1.Pod, podNets []*kubeovnNet) (*v1.Pod, error) {
        podName := c.getNameByPod(pod)
        key := fmt.Sprintf("%s/%s", pod.Namespace, podName)
        targetPortNameList := strset.NewWithSize(len(podNets))
        portsNeedToDel := []string{}
        annotationsNeedToDel := []string{}
        annotationsNeedToAdd := make(map[string]string)
        subnetUsedByPort := make(map[string]string)

        for _, podNet := range podNets {
                portName := ovs.PodNameToPortName(podName, pod.Namespace, podNet.ProviderName)
                targetPortNameList.Add(portName)
                if podNet.IPRequest != "" {
                        klog.Infof("pod %s/%s use custom IP %s for provider %s", pod.Namespace, pod.Name, podNet.IPRequest, podNet.ProviderName)
                        annotationsNeedToAdd[fmt.Sprintf(util.IPAddressAnnotationTemplate, podNet.ProviderName)] = podNet.IPRequest
                }

                if podNet.MacRequest != "" {
                        klog.Infof("pod %s/%s use custom MAC %s for provider %s", pod.Namespace, pod.Name, podNet.MacRequest, podNet.ProviderName)
                        annotationsNeedToAdd[fmt.Sprintf(util.MacAddressAnnotationTemplate, podNet.ProviderName)] = podNet.MacRequest
                }
        }

        ports, err := c.OVNNbClient.ListNormalLogicalSwitchPorts(true, map[string]string{"pod": key})
        if err != nil {
                klog.Errorf("failed to list lsps of pod '%s', %v", pod.Name, err)
                return nil, err
        }

        for _, port := range ports {
                if !targetPortNameList.Has(port.Name) {
                        portsNeedToDel = append(portsNeedToDel, port.Name)
                        subnetUsedByPort[port.Name] = port.ExternalIDs["ls"]
                        portNameSlice := strings.Split(port.Name, ".")
                        providerName := strings.Join(portNameSlice[2:], ".")
                        if providerName == util.OvnProvider {
                                continue
                        }
                        annotationsNeedToDel = append(annotationsNeedToDel, providerName)
                }
        }

        if len(portsNeedToDel) == 0 && len(annotationsNeedToAdd) == 0 {
                return pod, nil
        }

        for _, portNeedDel := range portsNeedToDel {
                klog.Infof("release port %s for pod %s", portNeedDel, podName)
                if subnet, ok := c.ipam.Subnets[subnetUsedByPort[portNeedDel]]; ok {
                        subnet.ReleaseAddressWithNicName(podName, portNeedDel)
                }
                if err := c.OVNNbClient.DeleteLogicalSwitchPort(portNeedDel); err != nil {
                        klog.Errorf("failed to delete lsp %s, %v", portNeedDel, err)
                        return nil, err
                }
                if err := c.config.KubeOvnClient.KubeovnV1().IPs().Delete(context.Background(), portNeedDel, metav1.DeleteOptions{}); err != nil {
                        if !k8serrors.IsNotFound(err) {
                                klog.Errorf("failed to delete ip %s, %v", portNeedDel, err)
                                return nil, err
                        }
                }
        }

        patch := util.KVPatch{}
        for _, providerName := range annotationsNeedToDel {
                for key := range pod.Annotations {
                        if strings.HasPrefix(key, providerName) {
                                patch[key] = nil
                        }
                }
        }

        for key, value := range annotationsNeedToAdd {
                patch[key] = value
        }

        if len(patch) == 0 {
                return pod, nil
        }

        if err = util.PatchAnnotations(c.config.KubeClient.CoreV1().Pods(pod.Namespace), pod.Name, patch); err != nil {
                if k8serrors.IsNotFound(err) {
                        return nil, nil
                }
                klog.Errorf("failed to clean annotations for pod %s/%s: %v", pod.Namespace, pod.Name, err)
                return nil, err
        }

        if pod, err = c.config.KubeClient.CoreV1().Pods(pod.Namespace).Get(context.TODO(), pod.Name, metav1.GetOptions{}); err != nil {
                if k8serrors.IsNotFound(err) {
                        return nil, nil
                }
                klog.Errorf("failed to get pod %s/%s: %v", pod.Namespace, pod.Name, err)
                return nil, err
        }

        return pod, nil
}

func isStatefulSetPod(pod *v1.Pod) (bool, string, types.UID) {
        for _, owner := range pod.OwnerReferences {
                if owner.Kind == util.StatefulSet && strings.HasPrefix(owner.APIVersion, "apps/") {
                        if strings.HasPrefix(pod.Name, owner.Name) {
                                return true, owner.Name, owner.UID
                        }
                }
        }
        return false, "", ""
}

func isStatefulSetPodToDel(c kubernetes.Interface, pod *v1.Pod, statefulSetName string, statefulSetUID types.UID) bool {
        // only delete statefulset pod lsp when statefulset deleted or down scaled
        sts, err := c.AppsV1().StatefulSets(pod.Namespace).Get(context.Background(), statefulSetName, metav1.GetOptions{})
        if err != nil {
                // statefulset is deleted
                if k8serrors.IsNotFound(err) {
                        klog.Infof("statefulset %s/%s has been deleted", pod.Namespace, statefulSetName)
                        return true
                }
                klog.Errorf("failed to get statefulset %s/%s: %v", pod.Namespace, statefulSetName, err)
                return false
        }

        // statefulset is being deleted, or it's a newly created one
        if !sts.DeletionTimestamp.IsZero() {
                klog.Infof("statefulset %s/%s is being deleted", pod.Namespace, statefulSetName)
                return true
        }
        if sts.UID != statefulSetUID {
                klog.Infof("statefulset %s/%s is a newly created one", pod.Namespace, statefulSetName)
                return true
        }

        // down scale statefulset
        tempStrs := strings.Split(pod.Name, "-")
        numStr := tempStrs[len(tempStrs)-1]
        index, err := strconv.ParseInt(numStr, 10, 0)
        if err != nil {
                klog.Errorf("failed to parse %s to int", numStr)
                return false
        }
        // down scaled
        var startOrdinal int64
        if sts.Spec.Ordinals != nil {
                startOrdinal = int64(sts.Spec.Ordinals.Start)
        }
        if index >= startOrdinal+int64(*sts.Spec.Replicas) {
                klog.Infof("statefulset %s/%s is down scaled", pod.Namespace, statefulSetName)
                return true
        }
        return false
}

// only gc statefulset pod lsp when:
// 1. the statefulset has been deleted or is being deleted
// 2. the statefulset has been deleted and recreated
// 3. the statefulset is down scaled and the pod is not alive
func isStatefulSetPodToGC(c kubernetes.Interface, pod *v1.Pod, statefulSetName string, statefulSetUID types.UID) bool {
        sts, err := c.AppsV1().StatefulSets(pod.Namespace).Get(context.Background(), statefulSetName, metav1.GetOptions{})
        if err != nil {
                // the statefulset has been deleted
                if k8serrors.IsNotFound(err) {
                        klog.Infof("statefulset %s/%s has been deleted", pod.Namespace, statefulSetName)
                        return true
                }
                klog.Errorf("failed to get statefulset %s/%s: %v", pod.Namespace, statefulSetName, err)
                return false
        }

        // statefulset is being deleted
        if !sts.DeletionTimestamp.IsZero() {
                klog.Infof("statefulset %s/%s is being deleted", pod.Namespace, statefulSetName)
                return true
        }
        // the statefulset has been deleted and recreated
        if sts.UID != statefulSetUID {
                klog.Infof("statefulset %s/%s is a newly created one", pod.Namespace, statefulSetName)
                return true
        }

        // the statefulset is down scaled and the pod is not alive

        tempStrs := strings.Split(pod.Name, "-")
        numStr := tempStrs[len(tempStrs)-1]
        index, err := strconv.ParseInt(numStr, 10, 0)
        if err != nil {
                klog.Errorf("failed to parse %s to int", numStr)
                return false
        }
        // down scaled
        var startOrdinal int64
        if sts.Spec.Ordinals != nil {
                startOrdinal = int64(sts.Spec.Ordinals.Start)
        }
        if index >= startOrdinal+int64(*sts.Spec.Replicas) {
                klog.Infof("statefulset %s/%s is down scaled", pod.Namespace, statefulSetName)
                if !isPodAlive(pod) {
                        // we must check whether the pod is alive because we have to consider the following case:
                        // 1. the statefulset is down scaled to zero
                        // 2. the lsp gc is triggered
                        // 3. gc interval, e.g. 90s, is passed and the second gc is triggered
                        // 4. the sts is up scaled to the original replicas
                        // 5. the pod is still running and it will not be recreated
                        return true
                }
        }

        return false
}

func getNodeTunlIP(node *v1.Node) ([]net.IP, error) {
        var nodeTunlIPAddr []net.IP
        nodeTunlIP := node.Annotations[util.IPAddressAnnotation]
        if nodeTunlIP == "" {
                return nil, errors.New("node has no tunnel ip annotation")
        }

        for ip := range strings.SplitSeq(nodeTunlIP, ",") {
                nodeTunlIPAddr = append(nodeTunlIPAddr, net.ParseIP(ip))
        }
        return nodeTunlIPAddr, nil
}

func getNextHopByTunnelIP(gw []net.IP) string {
        // validation check by caller
        nextHop := gw[0].String()
        if len(gw) == 2 {
                nextHop = gw[0].String() + "," + gw[1].String()
        }
        return nextHop
}

func needAllocateSubnets(pod *v1.Pod, nets []*kubeovnNet) []*kubeovnNet {
        // check if allocate from subnet is need.
        // allocate subnet when change subnet to hotplug nic
        // allocate subnet when migrate vm
        if !isPodAlive(pod) {
                return nil
        }

        if pod.Annotations == nil {
                return nets
        }

        migrate := false
        if job, ok := pod.Annotations[util.MigrationJobAnnotation]; ok {
                klog.Infof("pod %s/%s is in the migration job %s", pod.Namespace, pod.Name, job)
                migrate = true
        }

        result := make([]*kubeovnNet, 0, len(nets))
        for _, n := range nets {
                if migrate || pod.Annotations[fmt.Sprintf(util.AllocatedAnnotationTemplate, n.ProviderName)] != "true" {
                        result = append(result, n)
                }
        }
        return result
}

func needRestartNatGatewayPod(pod *v1.Pod) bool {
        for _, psc := range pod.Status.ContainerStatuses {
                if psc.Name != "vpc-nat-gw" {
                        continue
                }
                if psc.RestartCount > 0 {
                        return true
                }
        }
        return false
}

func (c *Controller) podNeedSync(pod *v1.Pod) (bool, error) {
        // 1. check annotations
        if pod.Annotations == nil {
                return true, nil
        }
        // 2. check annotation ovn subnet
        if pod.Annotations[util.RoutedAnnotation] != "true" {
                return true, nil
        }
        // 3. check multus subnet
        attachmentNets, err := c.getPodAttachmentNet(pod)
        if err != nil {
                klog.Error(err)
                return false, err
        }

        podName := c.getNameByPod(pod)
        for _, n := range attachmentNets {
                if pod.Annotations[fmt.Sprintf(util.RoutedAnnotationTemplate, n.ProviderName)] != "true" {
                        return true, nil
                }
                ipName := ovs.PodNameToPortName(podName, pod.Namespace, n.ProviderName)
                if _, err = c.ipsLister.Get(ipName); err != nil {
                        if !k8serrors.IsNotFound(err) {
                                err = fmt.Errorf("failed to get ip %s: %w", ipName, err)
                                klog.Error(err)
                                return false, err
                        }
                        klog.Infof("ip %s not found", ipName)
                        // need to sync to create ip
                        return true, nil
                }
        }
        return false, nil
}

func needRouteSubnets(pod *v1.Pod, nets []*kubeovnNet) []*kubeovnNet {
        if !isPodAlive(pod) {
                return nil
        }

        if pod.Annotations == nil {
                return nets
        }

        result := make([]*kubeovnNet, 0, len(nets))
        for _, n := range nets {
                if !isOvnSubnet(n.Subnet) {
                        continue
                }

                if pod.Annotations[fmt.Sprintf(util.AllocatedAnnotationTemplate, n.ProviderName)] == "true" && pod.Spec.NodeName != "" {
                        if pod.Annotations[fmt.Sprintf(util.RoutedAnnotationTemplate, n.ProviderName)] != "true" {
                                result = append(result, n)
                        }
                }
        }
        return result
}

func (c *Controller) getPodDefaultSubnet(pod *v1.Pod) (*kubeovnv1.Subnet, error) {
        // ignore to clean its ip crd in existing subnets
        ignoreSubnetNotExist := !pod.DeletionTimestamp.IsZero()

        // check pod annotations
        if lsName := pod.Annotations[util.LogicalSwitchAnnotation]; lsName != "" {
                // annotations only has one default subnet
                subnet, err := c.subnetsLister.Get(lsName)
                if err != nil {
                        klog.Errorf("failed to get subnet %s: %v", lsName, err)
                        if k8serrors.IsNotFound(err) {
                                if ignoreSubnetNotExist {
                                        klog.Errorf("deletting pod %s/%s default subnet %s already not exist, gc will clean its ip cr", pod.Namespace, pod.Name, lsName)
                                        return nil, nil
                                }
                        }
                        return nil, err
                }
                return subnet, nil
        }

        ns, err := c.namespacesLister.Get(pod.Namespace)
        if err != nil {
                klog.Errorf("failed to get namespace %s: %v", pod.Namespace, err)
                return nil, err
        }
        if len(ns.Annotations) == 0 {
                err = fmt.Errorf("namespace %s network annotations is empty", ns.Name)
                klog.Error(err)
                return nil, err
        }

        subnetNames := ns.Annotations[util.LogicalSwitchAnnotation]
        for subnetName := range strings.SplitSeq(subnetNames, ",") {
                if subnetName == "" {
                        err = fmt.Errorf("namespace %s default logical switch is not found", ns.Name)
                        klog.Error(err)
                        return nil, err
                }
                subnet, err := c.subnetsLister.Get(subnetName)
                if err != nil {
                        klog.Errorf("failed to get subnet %s: %v", subnetName, err)
                        if k8serrors.IsNotFound(err) {
                                if ignoreSubnetNotExist {
                                        klog.Errorf("deletting pod %s/%s namespace subnet %s already not exist, gc will clean its ip cr", pod.Namespace, pod.Name, subnetName)
                                        // ip name is unique, it is ok if any subnet release it
                                        // gc will handle their ip cr, if all subnets are not exist
                                        continue
                                }
                        }
                        return nil, err
                }

                switch subnet.Spec.Protocol {
                case kubeovnv1.ProtocolDual:
                        if subnet.Status.V6AvailableIPs == 0 && !c.podCanUseExcludeIPs(pod, subnet) {
                                klog.Infof("there's no available ipv6 address in subnet %s, try next one", subnet.Name)
                                continue
                        }
                        fallthrough
                case kubeovnv1.ProtocolIPv4:
                        if subnet.Status.V4AvailableIPs == 0 && !c.podCanUseExcludeIPs(pod, subnet) {
                                klog.Infof("there's no available ipv4 address in subnet %s, try next one", subnet.Name)
                                continue
                        }
                case kubeovnv1.ProtocolIPv6:
                        if subnet.Status.V6AvailableIPs == 0 && !c.podCanUseExcludeIPs(pod, subnet) {
                                klog.Infof("there's no available ipv6 address in subnet %s, try next one", subnet.Name)
                                continue
                        }
                }
                return subnet, nil
        }
        return nil, ipam.ErrNoAvailable
}

func (c *Controller) podCanUseExcludeIPs(pod *v1.Pod, subnet *kubeovnv1.Subnet) bool {
        if ipAddr := pod.Annotations[util.IPAddressAnnotation]; ipAddr != "" {
                return c.checkIPsInExcludeList(ipAddr, subnet.Spec.ExcludeIps, subnet.Spec.CIDRBlock)
        }
        if ipPool := pod.Annotations[util.IPPoolAnnotation]; ipPool != "" {
                return c.checkIPsInExcludeList(ipPool, subnet.Spec.ExcludeIps, subnet.Spec.CIDRBlock)
        }

        return false
}

func (c *Controller) checkIPsInExcludeList(ips string, excludeIPs []string, cidr string) bool {
        expandedExcludeIPs := util.ExpandExcludeIPs(excludeIPs, cidr)

        for ipAddr := range strings.SplitSeq(strings.TrimSpace(ips), ",") {
                ipAddr = strings.TrimSpace(ipAddr)
                if ipAddr == "" {
                        continue
                }

                for _, excludeIP := range expandedExcludeIPs {
                        if util.ContainsIPs(excludeIP, ipAddr) {
                                klog.V(3).Infof("IP %s is found in exclude IP %s, allowing allocation", ipAddr, excludeIP)
                                return true
                        }
                }
        }
        return false
}

type providerType int

const (
        providerTypeIPAM providerType = iota
        providerTypeOriginal
)

type kubeovnNet struct {
        Type               providerType
        ProviderName       string
        Subnet             *kubeovnv1.Subnet
        IsDefault          bool
        AllowLiveMigration bool
        IPRequest          string
        MacRequest         string
}

func (c *Controller) getPodAttachmentNet(pod *v1.Pod) ([]*kubeovnNet, error) {
        var multusNets []*nadv1.NetworkSelectionElement
        defaultAttachNetworks := pod.Annotations[util.DefaultNetworkAnnotation]
        if defaultAttachNetworks != "" {
                attachments, err := nadutils.ParseNetworkAnnotation(defaultAttachNetworks, pod.Namespace)
                if err != nil {
                        klog.Errorf("failed to parse default attach net for pod '%s', %v", pod.Name, err)
                        return nil, err
                }
                multusNets = attachments
        }

        attachNetworks := pod.Annotations[nadv1.NetworkAttachmentAnnot]
        if attachNetworks != "" {
                attachments, err := nadutils.ParseNetworkAnnotation(attachNetworks, pod.Namespace)
                if err != nil {
                        klog.Errorf("failed to parse attach net for pod '%s', %v", pod.Name, err)
                        return nil, err
                }
                multusNets = append(multusNets, attachments...)
        }
        subnets, err := c.subnetsLister.List(labels.Everything())
        if err != nil {
                klog.Errorf("failed to list subnets: %v", err)
                return nil, err
        }

        // ignore to return all existing subnets to clean its ip crd
        ignoreSubnetNotExist := !pod.DeletionTimestamp.IsZero()

        result := make([]*kubeovnNet, 0, len(multusNets))
        for _, attach := range multusNets {
                network, err := c.netAttachLister.NetworkAttachmentDefinitions(attach.Namespace).Get(attach.Name)
                if err != nil {
                        klog.Errorf("failed to get net-attach-def %s, %v", attach.Name, err)
                        return nil, err
                }

                if network.Spec.Config == "" {
                        continue
                }

                netCfg, err := loadNetConf([]byte(network.Spec.Config))
                if err != nil {
                        klog.Errorf("failed to load config of net-attach-def %s, %v", attach.Name, err)
                        return nil, err
                }

                // allocate kubeovn network
                var providerName string
                if util.IsOvnNetwork(netCfg) {
                        allowLiveMigration := false
                        isDefault := util.IsDefaultNet(pod.Annotations[util.DefaultNetworkAnnotation], attach)

                        providerName = fmt.Sprintf("%s.%s.%s", attach.Name, attach.Namespace, util.OvnProvider)
                        if pod.Annotations[util.MigrationJobAnnotation] != "" {
                                allowLiveMigration = true
                        }

                        subnetName := pod.Annotations[fmt.Sprintf(util.LogicalSwitchAnnotationTemplate, providerName)]
                        if subnetName == "" {
                                for _, subnet := range subnets {
                                        if subnet.Spec.Provider == providerName {
                                                subnetName = subnet.Name
                                                break
                                        }
                                }
                        }
                        var subnet *kubeovnv1.Subnet
                        if subnetName == "" {
                                // attachment network not specify subnet, use pod default subnet or namespace subnet
                                subnet, err = c.getPodDefaultSubnet(pod)
                                if err != nil {
                                        klog.Errorf("failed to pod default subnet, %v", err)
                                        if k8serrors.IsNotFound(err) {
                                                if ignoreSubnetNotExist {
                                                        klog.Errorf("deletting pod %s/%s attach subnet %s already not exist, gc will clean its ip cr", pod.Namespace, pod.Name, subnetName)
                                                        continue
                                                }
                                        }
                                        return nil, err
                                }
                                // default subnet may change after pod restart
                                klog.Infof("pod %s/%s attachment network %s use default subnet %s", pod.Namespace, pod.Name, attach.Name, subnet.Name)
                        } else {
                                subnet, err = c.subnetsLister.Get(subnetName)
                                if err != nil {
                                        klog.Errorf("failed to get subnet %s, %v", subnetName, err)
                                        if k8serrors.IsNotFound(err) {
                                                if ignoreSubnetNotExist {
                                                        klog.Errorf("deletting pod %s/%s attach subnet %s already not exist, gc will clean its ip cr", pod.Namespace, pod.Name, subnetName)
                                                        // just continue to next attach subnet
                                                        // ip name is unique, so it is ok if the other subnet release it
                                                        continue
                                                }
                                        }
                                        return nil, err
                                }
                        }

                        ret := &kubeovnNet{
                                Type:               providerTypeOriginal,
                                ProviderName:       providerName,
                                Subnet:             subnet,
                                IsDefault:          isDefault,
                                AllowLiveMigration: allowLiveMigration,
                                MacRequest:         attach.MacRequest,
                                IPRequest:          strings.Join(attach.IPRequest, ","),
                        }
                        result = append(result, ret)
                } else {
                        providerName = fmt.Sprintf("%s.%s", attach.Name, attach.Namespace)
                        for _, subnet := range subnets {
                                if subnet.Spec.Provider == providerName {
                                        result = append(result, &kubeovnNet{
                                                Type:         providerTypeIPAM,
                                                ProviderName: providerName,
                                                Subnet:       subnet,
                                                MacRequest:   attach.MacRequest,
                                                IPRequest:    strings.Join(attach.IPRequest, ","),
                                        })
                                        break
                                }
                        }
                }
        }
        return result, nil
}

func (c *Controller) validatePodIP(podName, subnetName, ipv4, ipv6 string) (bool, bool, error) {
        subnet, err := c.subnetsLister.Get(subnetName)
        if err != nil {
                klog.Errorf("failed to get subnet %s: %v", subnetName, err)
                return false, false, err
        }

        if subnet.Spec.Vlan == "" && subnet.Spec.Vpc == c.config.ClusterRouter {
                nodes, err := c.nodesLister.List(labels.Everything())
                if err != nil {
                        klog.Errorf("failed to list nodes: %v", err)
                        return false, false, err
                }

                for _, node := range nodes {
                        nodeIPv4, nodeIPv6 := util.GetNodeInternalIP(*node)
                        if ipv4 != "" && ipv4 == nodeIPv4 {
                                klog.Errorf("IP address (%s) assigned to pod %s is the same with internal IP address of node %s, reallocating...", ipv4, podName, node.Name)
                                return false, true, nil
                        }
                        if ipv6 != "" && ipv6 == nodeIPv6 {
                                klog.Errorf("IP address (%s) assigned to pod %s is the same with internal IP address of node %s, reallocating...", ipv6, podName, node.Name)
                                return true, false, nil
                        }
                }
        }

        return true, true, nil
}

func (c *Controller) acquireAddress(pod *v1.Pod, podNet *kubeovnNet) (string, string, string, *kubeovnv1.Subnet, error) {
        podName := c.getNameByPod(pod)
        key := fmt.Sprintf("%s/%s", pod.Namespace, podName)

        var checkVMPod bool
        isStsPod, _, _ := isStatefulSetPod(pod)
        // if pod has static vip
        vipName := pod.Annotations[util.VipAnnotation]
        if vipName != "" {
                vip, err := c.virtualIpsLister.Get(vipName)
                if err != nil {
                        klog.Errorf("failed to get static vip '%s', %v", vipName, err)
                        return "", "", "", podNet.Subnet, err
                }
                portName := ovs.PodNameToPortName(podName, pod.Namespace, podNet.ProviderName)
                if c.config.EnableKeepVMIP {
                        checkVMPod, _ = isVMPod(pod)
                }
                if err = c.podReuseVip(vipName, portName, isStsPod || checkVMPod); err != nil {
                        return "", "", "", podNet.Subnet, err
                }
                return vip.Status.V4ip, vip.Status.V6ip, vip.Status.Mac, podNet.Subnet, nil
        }

        var macPointer *string
        if isOvnSubnet(podNet.Subnet) {
                annoMAC := pod.Annotations[fmt.Sprintf(util.MacAddressAnnotationTemplate, podNet.ProviderName)]
                if annoMAC != "" {
                        if _, err := net.ParseMAC(annoMAC); err != nil {
                                return "", "", "", podNet.Subnet, err
                        }
                        macPointer = &annoMAC
                }
        } else {
                macPointer = ptr.To("")
        }

        ippoolStr := pod.Annotations[fmt.Sprintf(util.IPPoolAnnotationTemplate, podNet.ProviderName)]
        if ippoolStr == "" {
                ns, err := c.namespacesLister.Get(pod.Namespace)
                if err != nil {
                        klog.Errorf("failed to get namespace %s: %v", pod.Namespace, err)
                        return "", "", "", podNet.Subnet, err
                }

                if len(ns.Annotations) != 0 {
                        if ipPoolList, ok := ns.Annotations[util.IPPoolAnnotation]; ok {
                                for ipPoolName := range strings.SplitSeq(ipPoolList, ",") {
                                        ippool, err := c.ippoolLister.Get(ipPoolName)
                                        if err != nil {
                                                klog.Errorf("failed to get ippool %s: %v", ipPoolName, err)
                                                return "", "", "", podNet.Subnet, err
                                        }

                                        switch podNet.Subnet.Spec.Protocol {
                                        case kubeovnv1.ProtocolDual:
                                                if ippool.Status.V4AvailableIPs.Int64() == 0 || ippool.Status.V6AvailableIPs.Int64() == 0 {
                                                        continue
                                                }
                                        case kubeovnv1.ProtocolIPv4:
                                                if ippool.Status.V4AvailableIPs.Int64() == 0 {
                                                        continue
                                                }

                                        default:
                                                if ippool.Status.V6AvailableIPs.Int64() == 0 {
                                                        continue
                                                }
                                        }

                                        if ippool.Spec.Subnet == podNet.Subnet.Name {
                                                ippoolStr = ippool.Name
                                                break
                                        }
                                }
                        }
                }
        }

        // Random allocate
        if pod.Annotations[fmt.Sprintf(util.IPAddressAnnotationTemplate, podNet.ProviderName)] == "" &&
                ippoolStr == "" {
                var skippedAddrs []string
                for {
                        portName := ovs.PodNameToPortName(podName, pod.Namespace, podNet.ProviderName)

                        ipv4, ipv6, mac, err := c.ipam.GetRandomAddress(key, portName, macPointer, podNet.Subnet.Name, "", skippedAddrs, !podNet.AllowLiveMigration)
                        if err != nil {
                                klog.Error(err)
                                return "", "", "", podNet.Subnet, err
                        }
                        ipv4OK, ipv6OK, err := c.validatePodIP(pod.Name, podNet.Subnet.Name, ipv4, ipv6)
                        if err != nil {
                                klog.Error(err)
                                return "", "", "", podNet.Subnet, err
                        }
                        if ipv4OK && ipv6OK {
                                return ipv4, ipv6, mac, podNet.Subnet, nil
                        }

                        if !ipv4OK {
                                skippedAddrs = append(skippedAddrs, ipv4)
                        }
                        if !ipv6OK {
                                skippedAddrs = append(skippedAddrs, ipv6)
                        }
                }
        }

        portName := ovs.PodNameToPortName(podName, pod.Namespace, podNet.ProviderName)

        // The static ip can be assigned from any subnet after ns supports multi subnets
        nsNets, _ := c.getNsAvailableSubnets(pod, podNet)
        var v4IP, v6IP, mac string
        var err error

        // Static allocate
        if pod.Annotations[fmt.Sprintf(util.IPAddressAnnotationTemplate, podNet.ProviderName)] != "" {
                ipStr := pod.Annotations[fmt.Sprintf(util.IPAddressAnnotationTemplate, podNet.ProviderName)]

                for _, net := range nsNets {
                        v4IP, v6IP, mac, err = c.acquireStaticAddress(key, portName, ipStr, macPointer, net.Subnet.Name, net.AllowLiveMigration)
                        if err == nil {
                                return v4IP, v6IP, mac, net.Subnet, nil
                        }
                }
                return v4IP, v6IP, mac, podNet.Subnet, err
        }

        // IPPool allocate
        if ippoolStr != "" {
                var ipPool []string
                if strings.ContainsRune(ippoolStr, ';') {
                        ipPool = strings.Split(ippoolStr, ";")
                } else {
                        ipPool = strings.Split(ippoolStr, ",")
                        if len(ipPool) == 2 && util.CheckProtocol(ipPool[0]) != util.CheckProtocol(ipPool[1]) {
                                ipPool = []string{ippoolStr}
                        }
                }
                for i, ip := range ipPool {
                        ipPool[i] = strings.TrimSpace(ip)
                }

                if len(ipPool) == 1 && (!strings.ContainsRune(ipPool[0], ',') && net.ParseIP(ipPool[0]) == nil) {
                        var skippedAddrs []string
                        for {
                                portName := ovs.PodNameToPortName(podName, pod.Namespace, podNet.ProviderName)
                                ipv4, ipv6, mac, err := c.ipam.GetRandomAddress(key, portName, macPointer, podNet.Subnet.Name, ipPool[0], skippedAddrs, !podNet.AllowLiveMigration)
                                if err != nil {
                                        klog.Error(err)
                                        return "", "", "", podNet.Subnet, err
                                }
                                ipv4OK, ipv6OK, err := c.validatePodIP(pod.Name, podNet.Subnet.Name, ipv4, ipv6)
                                if err != nil {
                                        klog.Error(err)
                                        return "", "", "", podNet.Subnet, err
                                }
                                if ipv4OK && ipv6OK {
                                        return ipv4, ipv6, mac, podNet.Subnet, nil
                                }

                                if !ipv4OK {
                                        skippedAddrs = append(skippedAddrs, ipv4)
                                }
                                if !ipv6OK {
                                        skippedAddrs = append(skippedAddrs, ipv6)
                                }
                        }
                }

                if !isStsPod {
                        for _, net := range nsNets {
                                for _, staticIP := range ipPool {
                                        var checkIP string
                                        ipProtocol := util.CheckProtocol(staticIP)
                                        if ipProtocol == kubeovnv1.ProtocolDual {
                                                checkIP = strings.Split(staticIP, ",")[0]
                                        } else {
                                                checkIP = staticIP
                                        }

                                        if assignedPod, ok := c.ipam.IsIPAssignedToOtherPod(checkIP, net.Subnet.Name, key); ok {
                                                klog.Errorf("static address %s for %s has been assigned to %s", staticIP, key, assignedPod)
                                                continue
                                        }

                                        v4IP, v6IP, mac, err = c.acquireStaticAddress(key, portName, staticIP, macPointer, net.Subnet.Name, net.AllowLiveMigration)
                                        if err == nil {
                                                return v4IP, v6IP, mac, net.Subnet, nil
                                        }
                                }
                        }
                        klog.Errorf("acquire address from ippool %s for %s failed, %v", ippoolStr, key, err)
                } else {
                        tempStrs := strings.Split(pod.Name, "-")
                        numStr := tempStrs[len(tempStrs)-1]
                        index, _ := strconv.Atoi(numStr)

                        if index < len(ipPool) {
                                for _, net := range nsNets {
                                        v4IP, v6IP, mac, err = c.acquireStaticAddress(key, portName, ipPool[index], macPointer, net.Subnet.Name, net.AllowLiveMigration)
                                        if err == nil {
                                                return v4IP, v6IP, mac, net.Subnet, nil
                                        }
                                }
                                klog.Errorf("acquire address %s for %s failed, %v", ipPool[index], key, err)
                        }
                }
        }
        klog.Errorf("allocate address for %s failed, return NoAvailableAddress", key)
        return "", "", "", podNet.Subnet, ipam.ErrNoAvailable
}

func (c *Controller) acquireStaticAddress(key, nicName, ip string, mac *string, subnet string, liveMigration bool) (string, string, string, error) {
        var v4IP, v6IP, macStr string
        var err error
        for ipStr := range strings.SplitSeq(ip, ",") {
                if net.ParseIP(ipStr) == nil {
                        return "", "", "", fmt.Errorf("failed to parse IP %s", ipStr)
                }
        }

        if v4IP, v6IP, macStr, err = c.ipam.GetStaticAddress(key, nicName, ip, mac, subnet, !liveMigration); err != nil {
                klog.Errorf("failed to get static ip %v, mac %v, subnet %v, err %v", ip, mac, subnet, err)
                return "", "", "", err
        }
        return v4IP, v6IP, macStr, nil
}

func appendCheckPodToDel(c *Controller, pod *v1.Pod, ownerRefName, ownerRefKind string) (bool, error) {
        // subnet for ns has been changed, and statefulset pod's ip is not in the range of subnet's cidr anymore
        podNs, err := c.namespacesLister.Get(pod.Namespace)
        if err != nil {
                klog.Errorf("failed to get namespace %s, %v", pod.Namespace, err)
                return false, err
        }

        // check if subnet exist in OwnerReference
        var ownerRefSubnetExist bool
        var ownerRefSubnet string
        switch ownerRefKind {
        case util.StatefulSet:
                ss, err := c.config.KubeClient.AppsV1().StatefulSets(pod.Namespace).Get(context.Background(), ownerRefName, metav1.GetOptions{})
                if err != nil {
                        if k8serrors.IsNotFound(err) {
                                klog.Infof("Statefulset %s is not found", ownerRefName)
                                return true, nil
                        }
                        klog.Errorf("failed to get StatefulSet %s, %v", ownerRefName, err)
                }
                if ss.Spec.Template.Annotations[util.LogicalSwitchAnnotation] != "" {
                        ownerRefSubnetExist = true
                        ownerRefSubnet = ss.Spec.Template.Annotations[util.LogicalSwitchAnnotation]
                }

        case util.VMInstance:
                vm, err := c.config.KubevirtClient.VirtualMachine(pod.Namespace).Get(context.Background(), ownerRefName, metav1.GetOptions{})
                if err != nil {
                        if k8serrors.IsNotFound(err) {
                                klog.Infof("VirtualMachine %s is not found", ownerRefName)
                                return true, nil
                        }
                        klog.Errorf("failed to get VirtualMachine %s, %v", ownerRefName, err)
                }
                if vm != nil &&
                        vm.Spec.Template != nil &&
                        vm.Spec.Template.ObjectMeta.Annotations != nil &&
                        vm.Spec.Template.ObjectMeta.Annotations[util.LogicalSwitchAnnotation] != "" {
                        ownerRefSubnetExist = true
                        ownerRefSubnet = vm.Spec.Template.ObjectMeta.Annotations[util.LogicalSwitchAnnotation]
                }
        }
        podSwitch := strings.TrimSpace(pod.Annotations[util.LogicalSwitchAnnotation])
        if !ownerRefSubnetExist {
                nsSubnetNames := podNs.Annotations[util.LogicalSwitchAnnotation]
                // check if pod use the subnet of its ns
                if nsSubnetNames != "" && podSwitch != "" && !slices.Contains(strings.Split(nsSubnetNames, ","), podSwitch) {
                        klog.Infof("ns %s annotation subnet is %s, which is inconstant with subnet for pod %s, delete pod", pod.Namespace, nsSubnetNames, pod.Name)
                        return true, nil
                }
        }

        // subnet cidr has been changed, and statefulset pod's ip is not in the range of subnet's cidr anymore
        podSubnet, err := c.subnetsLister.Get(podSwitch)
        if err != nil {
                klog.Errorf("failed to get subnet %s, %v, not auto clean ip", podSwitch, err)
                return false, err
        }
        if podSubnet == nil {
                // TODO: remove: CRD get interface will retrun a nil subnet ?
                klog.Errorf("pod %s/%s subnet %s is nil, not auto clean ip", pod.Namespace, pod.Name, podSwitch)
                return false, nil
        }
        podIP := pod.Annotations[util.IPAddressAnnotation]
        if podIP == "" {
                // delete pod just after it created < 1ms
                klog.Infof("pod %s/%s annotaions has no ip address, not auto clean ip", pod.Namespace, pod.Name)
                return false, nil
        }
        podSubnetCidr := podSubnet.Spec.CIDRBlock
        if podSubnetCidr == "" {
                // subnet spec cidr changed by user
                klog.Errorf("invalid pod subnet %s empty cidr %s, not auto clean ip", podSwitch, podSubnetCidr)
                return false, nil
        }
        if !util.CIDRContainIP(podSubnetCidr, podIP) {
                klog.Infof("pod's ip %s is not in the range of subnet %s, delete pod", pod.Annotations[util.IPAddressAnnotation], podSubnet.Name)
                return true, nil
        }
        // subnet of ownerReference(sts/vm) has been changed, it needs to handle delete pod and create port on the new logical switch
        if ownerRefSubnet != "" && podSubnet.Name != ownerRefSubnet {
                klog.Infof("Subnet of owner %s has been changed from %s to %s, delete pod %s/%s", ownerRefName, podSubnet.Name, ownerRefSubnet, pod.Namespace, pod.Name)
                return true, nil
        }

        return false, nil
}

func isVMPod(pod *v1.Pod) (bool, string) {
        for _, owner := range pod.OwnerReferences {
                // The name of vmi is consistent with vm's name.
                if owner.Kind == util.VMInstance && strings.HasPrefix(owner.APIVersion, "kubevirt.io") {
                        return true, owner.Name
                }
        }
        return false, ""
}

func isOwnsByTheVM(vmi metav1.Object) (bool, string) {
        for _, owner := range vmi.GetOwnerReferences() {
                if owner.Kind == util.VM && strings.HasPrefix(owner.APIVersion, "kubevirt.io") {
                        return true, owner.Name
                }
        }
        return false, ""
}

func (c *Controller) isVMToDel(pod *v1.Pod, vmiName string) bool {
        var (
                vmiAlive bool
                vmName   string
        )
        // The vmi is also deleted when pod is deleted, only left vm exists.
        vmi, err := c.config.KubevirtClient.VirtualMachineInstance(pod.Namespace).Get(context.Background(), vmiName, metav1.GetOptions{})
        if err != nil {
                if k8serrors.IsNotFound(err) {
                        vmiAlive = false
                        // The name of vmi is consistent with vm's name.
                        vmName = vmiName
                        klog.ErrorS(err, "failed to get vmi, will try to get the vm directly", "name", vmiName)
                } else {
                        klog.ErrorS(err, "failed to get vmi", "name", vmiName)
                        return false
                }
        } else {
                var ownsByVM bool
                ownsByVM, vmName = isOwnsByTheVM(vmi)
                if !ownsByVM && !vmi.DeletionTimestamp.IsZero() {
                        klog.Infof("ephemeral vmi %s is deleting", vmiName)
                        return true
                }
                vmiAlive = vmi.DeletionTimestamp.IsZero()
        }

        if vmiAlive {
                return false
        }

        vm, err := c.config.KubevirtClient.VirtualMachine(pod.Namespace).Get(context.Background(), vmName, metav1.GetOptions{})
        if err != nil {
                // the vm has gone
                if k8serrors.IsNotFound(err) {
                        klog.ErrorS(err, "failed to get vm", "name", vmName)
                        return true
                }
                klog.ErrorS(err, "failed to get vm", "name", vmName)
                return false
        }

        if !vm.DeletionTimestamp.IsZero() {
                klog.Infof("vm %s is deleting", vmName)
                return true
        }
        return false
}

func (c *Controller) getNameByPod(pod *v1.Pod) string {
        if c.config.EnableKeepVMIP {
                if isVMPod, vmName := isVMPod(pod); isVMPod {
                        return vmName
                }
        }
        return pod.Name
}

// When subnet's v4availableIPs is 0 but still there's available ip in exclude-ips, the static ip in exclude-ips can be allocated normal.
func (c *Controller) getNsAvailableSubnets(pod *v1.Pod, podNet *kubeovnNet) ([]*kubeovnNet, error) {
        var result []*kubeovnNet
        // keep the annotation subnet of the pod in first position
        result = append(result, podNet)

        ns, err := c.namespacesLister.Get(pod.Namespace)
        if err != nil {
                klog.Errorf("failed to get namespace %s, %v", pod.Namespace, err)
                return nil, err
        }
        if ns.Annotations == nil {
                return nil, nil
        }

        subnetNames := ns.Annotations[util.LogicalSwitchAnnotation]
        for subnetName := range strings.SplitSeq(subnetNames, ",") {
                if subnetName == "" || subnetName == podNet.Subnet.Name {
                        continue
                }
                subnet, err := c.subnetsLister.Get(subnetName)
                if err != nil {
                        klog.Errorf("failed to get subnet %v", err)
                        return nil, err
                }

                result = append(result, &kubeovnNet{
                        Type:         providerTypeOriginal,
                        ProviderName: subnet.Spec.Provider,
                        Subnet:       subnet,
                })
        }

        return result, nil
}

func getPodType(pod *v1.Pod) string {
        if ok, _, _ := isStatefulSetPod(pod); ok {
                return util.StatefulSet
        }

        if isVMPod, _ := isVMPod(pod); isVMPod {
                return util.VM
        }
        return ""
}

func (c *Controller) getVirtualIPs(pod *v1.Pod, podNets []*kubeovnNet) map[string]string {
        vipsListMap := make(map[string][]string)
        var vipNamesList []string
        for vipName := range strings.SplitSeq(strings.TrimSpace(pod.Annotations[util.AAPsAnnotation]), ",") {
                if vipName = strings.TrimSpace(vipName); vipName == "" {
                        continue
                }
                if !slices.Contains(vipNamesList, vipName) {
                        vipNamesList = append(vipNamesList, vipName)
                } else {
                        continue
                }
                vip, err := c.virtualIpsLister.Get(vipName)
                if err != nil {
                        klog.Errorf("failed to get vip %s, %v", vipName, err)
                        continue
                }
                if vip.Spec.Namespace != pod.Namespace || (vip.Status.V4ip == "" && vip.Status.V6ip == "") {
                        continue
                }
                for _, podNet := range podNets {
                        if podNet.Subnet.Name == vip.Spec.Subnet {
                                key := fmt.Sprintf("%s.%s", podNet.Subnet.Name, podNet.ProviderName)
                                vipsList := vipsListMap[key]
                                if vipsList == nil {
                                        vipsList = []string{}
                                }
                                // ipam will ensure the uniqueness of VIP
                                if util.IsValidIP(vip.Status.V4ip) {
                                        vipsList = append(vipsList, vip.Status.V4ip)
                                }
                                if util.IsValidIP(vip.Status.V6ip) {
                                        vipsList = append(vipsList, vip.Status.V6ip)
                                }

                                vipsListMap[key] = vipsList
                        }
                }
        }

        for _, podNet := range podNets {
                vipStr := pod.Annotations[fmt.Sprintf(util.PortVipAnnotationTemplate, podNet.ProviderName)]
                if vipStr == "" {
                        continue
                }
                key := fmt.Sprintf("%s.%s", podNet.Subnet.Name, podNet.ProviderName)
                vipsList := vipsListMap[key]
                if vipsList == nil {
                        vipsList = []string{}
                }

                for vip := range strings.SplitSeq(vipStr, ",") {
                        if util.IsValidIP(vip) && !slices.Contains(vipsList, vip) {
                                vipsList = append(vipsList, vip)
                        }
                }

                vipsListMap[key] = vipsList
        }

        vipsMap := make(map[string]string)
        for key, vipsList := range vipsListMap {
                vipsMap[key] = strings.Join(vipsList, ",")
        }
        return vipsMap
}

func setPodRoutesAnnotation(annotations map[string]string, provider string, routes []request.Route) error {
        key := fmt.Sprintf(util.RoutesAnnotationTemplate, provider)
        if len(routes) == 0 {
                delete(annotations, key)
                return nil
        }

        buf, err := json.Marshal(routes)
        if err != nil {
                err = fmt.Errorf("failed to marshal routes %+v: %w", routes, err)
                klog.Error(err)
                return err
        }
        annotations[key] = string(buf)

        return nil
}

// Check if pod is a VPC NAT gateway using pod annotations
func (c *Controller) checkIsPodVpcNatGw(pod *v1.Pod) (bool, string) {
        if pod == nil {
                return false, ""
        }
        if pod.Annotations == nil {
                return false, ""
        }
        // default provider
        providerName := util.OvnProvider
        // In non-primary CNI mode, we get the providers from the pod annotations
        // We get the vpc nat gw name using the provider name
        if c.config.EnableNonPrimaryCNI {
                // get providers
                providers, err := c.getPodProviders(pod)
                if err != nil {
                        klog.Errorf("failed to get pod %s/%s providers, %v", pod.Namespace, pod.Name, err)
                        return false, ""
                }
                if len(providers) > 0 {
                        // use the first provider
                        providerName = providers[0]
                }
        }
        vpcGwName, isVpcNatGw := pod.Annotations[fmt.Sprintf(util.VpcNatGatewayAnnotationTemplate, providerName)]
        if isVpcNatGw {
                if vpcGwName == "" {
                        klog.Errorf("pod %s is vpc nat gateway but name is empty", pod.Name)
                        return false, ""
                }
                klog.Infof("pod %s is vpc nat gateway %s", pod.Name, vpcGwName)
        }
        return isVpcNatGw, vpcGwName
}

kubeovn / kube-ovn / 17601237263

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