20094102470

Committed 10 Dec 2025 09:40AM UTC coverage: 22.351% (+0.04%) from 22.308%

Build # 20094102470

Build Type

push

github

Committed by

web-flow

Commit Message

simplify subnet.go code (#6009)

* simplify enqueueUpdate

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

* refactor format

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

* refactor calculate IPs

* add helper function

* simplify ip parse

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

* refactor subnet status calculation to unify IP handling

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

* split subnet status update to subnet_status.go

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

* fix status triger subnet update

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

---------

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

Run Details

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7 existing lines in 1 file now uncovered.

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Source File
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6.62

/pkg/controller/subnet.go

package controller

import (
        "context"
        "errors"
        "fmt"
        "maps"
        "net"
        "reflect"
        "slices"
        "sort"
        "strings"

        "github.com/ovn-kubernetes/libovsdb/ovsdb"
        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"
        "k8s.io/client-go/tools/cache"
        "k8s.io/klog/v2"
        "sigs.k8s.io/controller-runtime/pkg/client"
        "sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"

        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/util"
)

func (c *Controller) enqueueAddSubnet(obj any) {
        key := cache.MetaObjectToName(obj.(*kubeovnv1.Subnet)).String()
        klog.V(3).Infof("enqueue add subnet %s", key)
        c.addOrUpdateSubnetQueue.Add(key)
}

func (c *Controller) enqueueDeleteSubnet(obj any) {
        var subnet *kubeovnv1.Subnet
        switch t := obj.(type) {
        case *kubeovnv1.Subnet:
                subnet = t
        case cache.DeletedFinalStateUnknown:
                s, ok := t.Obj.(*kubeovnv1.Subnet)
                if !ok {
                        klog.Warningf("unexpected object type: %T", t.Obj)
                        return
                }
                subnet = s
        default:
                klog.Warningf("unexpected type: %T", obj)
                return
        }

        klog.V(3).Infof("enqueue delete subnet %s", subnet.Name)
        c.deleteSubnetQueue.Add(subnet)
}

func readyToRemoveFinalizer(subnet *kubeovnv1.Subnet) bool {
        if subnet.DeletionTimestamp.IsZero() {
                return false
        }

        if subnet.Status.V4UsingIPs+subnet.Status.V6UsingIPs == 0 {
                return true
        }

        if subnet.Status.U2OInterconnectionIP != "" {
                return int(subnet.Status.V4UsingIPs+subnet.Status.V6UsingIPs) == len(strings.Split(subnet.Status.U2OInterconnectionIP, ","))
        }

        return false
}

func (c *Controller) enqueueUpdateSubnet(oldObj, newObj any) {
        oldSubnet := oldObj.(*kubeovnv1.Subnet)
        newSubnet := newObj.(*kubeovnv1.Subnet)
        key := cache.MetaObjectToName(newSubnet).String()

        if readyToRemoveFinalizer(newSubnet) {
                klog.Infof("enqueue update subnet %s triggered by ready to remove finalizer", key)
                c.addOrUpdateSubnetQueue.Add(key)
                return
        }

        if !reflect.DeepEqual(oldSubnet.Spec, newSubnet.Spec) {
                klog.V(3).Infof("enqueue update subnet %s", key)

                if oldSubnet.Spec.U2OInterconnection != newSubnet.Spec.U2OInterconnection {
                        klog.Infof("enqueue update vpc %s to update always-lear-from-arp option triggered by u2o interconnection change of subnet %s", newSubnet.Spec.Vpc, key)
                        c.addOrUpdateVpcQueue.Add(newSubnet.Spec.Vpc)
                }

                if oldSubnet.Spec.GatewayType != newSubnet.Spec.GatewayType {
                        c.recorder.Eventf(newSubnet, v1.EventTypeNormal, "SubnetGatewayTypeChanged",
                                "subnet gateway type changes from %q to %q", oldSubnet.Spec.GatewayType, newSubnet.Spec.GatewayType)
                }

                if oldSubnet.Spec.GatewayNode != newSubnet.Spec.GatewayNode {
                        c.recorder.Eventf(newSubnet, v1.EventTypeNormal, "SubnetGatewayNodeChanged",
                                "gateway node changes from %q to %q", oldSubnet.Spec.GatewayNode, newSubnet.Spec.GatewayNode)
                }

                c.addOrUpdateSubnetQueue.Add(key)
        }
}

func (c *Controller) formatSubnet(subnet *kubeovnv1.Subnet) (*kubeovnv1.Subnet, error) {
        newSubnet := subnet.DeepCopy()
        if err := formatAddress(newSubnet); err != nil {
                klog.Error(err)
                return nil, err
        }

        if newSubnet.Spec.Provider == "" {
                newSubnet.Spec.Provider = util.OvnProvider
        }

        if newSubnet.Spec.Vpc == "" {
                if isOvnSubnet(newSubnet) {
                        newSubnet.Spec.Vpc = c.config.ClusterRouter
                }
        }

        if newSubnet.Spec.Vpc == c.config.ClusterRouter && newSubnet.Name != c.config.NodeSwitch {
                // Some format only needed in the default VPC
                if newSubnet.Spec.GatewayType == "" {
                        newSubnet.Spec.GatewayType = kubeovnv1.GWDistributedType
                }
                if newSubnet.Spec.Default && newSubnet.Name != c.config.DefaultLogicalSwitch {
                        newSubnet.Spec.Default = false
                }
        }

        if newSubnet.Spec.EnableLb == nil && newSubnet.Name != c.config.NodeSwitch {
                newSubnet.Spec.EnableLb = &c.config.EnableLb
        }
        // set join subnet Spec.EnableLb to nil
        if newSubnet.Spec.EnableLb != nil && newSubnet.Name == c.config.NodeSwitch {
                newSubnet.Spec.EnableLb = nil
        }

        if newSubnet.Spec.U2OInterconnectionIP != "" && !newSubnet.Spec.U2OInterconnection {
                newSubnet.Spec.U2OInterconnectionIP = ""
        }

        if newSubnet.Spec.Vlan == "" && newSubnet.Spec.U2OInterconnection {
                newSubnet.Spec.U2OInterconnection = false
        }

        changed := !reflect.DeepEqual(subnet, newSubnet)
        klog.Infof("format subnet %v, changed %v", subnet.Name, changed)
        if changed {
                ret, err := c.config.KubeOvnClient.KubeovnV1().Subnets().Update(context.Background(), newSubnet, metav1.UpdateOptions{})
                if err != nil {
                        klog.Errorf("failed to update subnet %s, %v", subnet.Name, err)
                        return nil, err
                }
                return ret, nil
        }
        return subnet, nil
}

func (c *Controller) validateSubnetVlan(subnet *kubeovnv1.Subnet) error {
        if subnet.Spec.Vlan == "" {
                return nil
        }

        vlan, err := c.vlansLister.Get(subnet.Spec.Vlan)
        if err != nil {
                err = fmt.Errorf("failed to get vlan %s: %w", subnet.Spec.Vlan, err)
                klog.Error(err)
                return err
        }

        if vlan.Status.Conflict {
                err = fmt.Errorf("subnet %s has invalid conflict vlan %s", subnet.Name, vlan.Name)
                klog.Error(err)
                return err
        }
        return nil
}

func formatAddress(subnet *kubeovnv1.Subnet) error {
        if err := formatCIDR(subnet); err != nil {
                klog.Error(err)
                return err
        }

        if err := formatGateway(subnet); err != nil {
                klog.Error(err)
                return err
        }

        formatExcludeIPs(subnet)

        subnet.Spec.Protocol = util.CheckProtocol(subnet.Spec.CIDRBlock)

        return nil
}

func formatCIDR(subnet *kubeovnv1.Subnet) error {
        var cidrBlocks []string

        for cidr := range strings.SplitSeq(subnet.Spec.CIDRBlock, ",") {
                _, ipNet, err := net.ParseCIDR(cidr)
                if err != nil {
                        klog.Error(err)
                        return fmt.Errorf("subnet %s cidr %s is invalid", subnet.Name, cidr)
                }
                cidrBlocks = append(cidrBlocks, ipNet.String())
        }
        subnet.Spec.CIDRBlock = strings.Join(cidrBlocks, ",")
        return nil
}

func formatGateway(subnet *kubeovnv1.Subnet) error {
        var (
                gw  string
                err error
        )

        switch {
        case subnet.Spec.Gateway == "":
                gw, err = util.GetGwByCidr(subnet.Spec.CIDRBlock)
        case subnet.Spec.Protocol == kubeovnv1.ProtocolDual && util.CheckProtocol(subnet.Spec.Gateway) != util.CheckProtocol(subnet.Spec.CIDRBlock):
                gw, err = util.AppendGwByCidr(subnet.Spec.Gateway, subnet.Spec.CIDRBlock)
        default:
                gw = subnet.Spec.Gateway
        }
        if err != nil {
                klog.Error(err)
                return err
        }
        subnet.Spec.Gateway = gw

        return nil
}

func formatExcludeIPs(subnet *kubeovnv1.Subnet) {
        var excludeIPs []string
        excludeIPs = append(excludeIPs, strings.Split(subnet.Spec.Gateway, ",")...)
        sort.Strings(excludeIPs)
        if len(subnet.Spec.ExcludeIps) == 0 {
                subnet.Spec.ExcludeIps = excludeIPs
        } else {
                formatExcludeIPRanges(subnet)
                for _, gw := range excludeIPs {
                        gwExists := false
                        for _, excludeIP := range subnet.Spec.ExcludeIps {
                                if util.ContainsIPs(excludeIP, gw) {
                                        gwExists = true
                                        break
                                }
                        }
                        if !gwExists {
                                subnet.Spec.ExcludeIps = append(subnet.Spec.ExcludeIps, gw)
                                sort.Strings(subnet.Spec.ExcludeIps)
                        }
                }
        }
}

func (c *Controller) syncSubnetFinalizer(cl client.Client) error {
        // migrate depreciated finalizer to new finalizer
        subnets := &kubeovnv1.SubnetList{}
        return migrateFinalizers(cl, subnets, func(i int) (client.Object, client.Object) {
                if i < 0 || i >= len(subnets.Items) {
                        return nil, nil
                }
                return subnets.Items[i].DeepCopy(), subnets.Items[i].DeepCopy()
        })
}

func (c *Controller) handleSubnetFinalizer(subnet *kubeovnv1.Subnet) (*kubeovnv1.Subnet, bool, error) {
        if subnet.DeletionTimestamp.IsZero() && !slices.Contains(subnet.GetFinalizers(), util.KubeOVNControllerFinalizer) {
                newSubnet := subnet.DeepCopy()
                controllerutil.AddFinalizer(newSubnet, util.KubeOVNControllerFinalizer)
                patch, err := util.GenerateMergePatchPayload(subnet, newSubnet)
                if err != nil {
                        klog.Errorf("failed to generate patch payload for subnet '%s', %v", subnet.Name, err)
                        return newSubnet, false, err
                }
                patchSubnet, err := c.config.KubeOvnClient.KubeovnV1().Subnets().Patch(context.Background(), subnet.Name, types.MergePatchType, patch, metav1.PatchOptions{}, "")
                if err != nil {
                        klog.Errorf("failed to add finalizer to subnet %s, %v", subnet.Name, err)
                        return patchSubnet, false, err
                }

                return patchSubnet, false, nil
        }

        usingIPs := subnet.Status.V4UsingIPs
        if util.CheckProtocol(subnet.Spec.CIDRBlock) == kubeovnv1.ProtocolIPv6 {
                usingIPs = subnet.Status.V6UsingIPs
        }

        u2oInterconnIP := subnet.Status.U2OInterconnectionIP
        if !subnet.DeletionTimestamp.IsZero() && (usingIPs == 0 || (usingIPs == 1 && u2oInterconnIP != "")) {
                newSubnet := subnet.DeepCopy()
                controllerutil.RemoveFinalizer(newSubnet, util.KubeOVNControllerFinalizer)
                patch, err := util.GenerateMergePatchPayload(subnet, newSubnet)
                if err != nil {
                        klog.Errorf("failed to generate patch payload for subnet '%s', %v", subnet.Name, err)
                        return newSubnet, false, err
                }
                if _, err := c.config.KubeOvnClient.KubeovnV1().Subnets().Patch(context.Background(), subnet.Name,
                        types.MergePatchType, patch, metav1.PatchOptions{}, ""); err != nil {
                        klog.Errorf("failed to remove finalizer from subnet %s, %v", subnet.Name, err)
                        return newSubnet, false, err
                }
                return newSubnet, true, nil
        }
        return subnet, false, nil
}

func (c *Controller) validateVpcBySubnet(subnet *kubeovnv1.Subnet) (*kubeovnv1.Vpc, error) {
        vpc, err := c.vpcsLister.Get(subnet.Spec.Vpc)
        if err != nil {
                klog.Errorf("failed to get subnet's vpc '%s', %v", subnet.Spec.Vpc, err)
                return vpc, err
        }

        if !vpc.Status.Standby {
                err = fmt.Errorf("the vpc '%s' not standby yet", vpc.Name)
                klog.Error(err)
                return vpc, err
        }

        if !vpc.Status.Default {
                for _, ns := range subnet.Spec.Namespaces {
                        if !slices.Contains(vpc.Spec.Namespaces, ns) {
                                err = fmt.Errorf("namespace '%s' is out of range to custom vpc '%s'", ns, vpc.Name)
                                klog.Error(err)
                                return vpc, err
                        }
                }
        } else {
                vpcs, err := c.vpcsLister.List(labels.Everything())
                if err != nil {
                        klog.Errorf("failed to list vpc, %v", err)
                        return vpc, err
                }

                for _, vpc := range vpcs {
                        if subnet.Spec.Vpc != vpc.Name &&
                                !vpc.Status.Default && util.IsStringsOverlap(vpc.Spec.Namespaces, subnet.Spec.Namespaces) {
                                err = fmt.Errorf("namespaces %v are overlap with vpc '%s'", subnet.Spec.Namespaces, vpc.Name)
                                klog.Error(err)
                                return vpc, err
                        }
                }
        }
        return vpc, nil
}

func (c *Controller) checkSubnetConflict(subnet *kubeovnv1.Subnet) error {
        subnetList, err := c.subnetsLister.List(labels.Everything())
        if err != nil {
                klog.Errorf("failed to list subnets %v", err)
                return err
        }

        for _, sub := range subnetList {
                if sub.Spec.Vpc != subnet.Spec.Vpc || sub.Spec.Vlan != subnet.Spec.Vlan || sub.Name == subnet.Name {
                        continue
                }

                if util.CIDROverlap(sub.Spec.CIDRBlock, subnet.Spec.CIDRBlock) {
                        err = fmt.Errorf("subnet %s cidr %s is conflict with subnet %s cidr %s", subnet.Name, subnet.Spec.CIDRBlock, sub.Name, sub.Spec.CIDRBlock)
                        klog.Error(err)
                        if err = c.patchSubnetStatus(subnet, "ValidateLogicalSwitchFailed", err.Error()); err != nil {
                                klog.Error(err)
                                return err
                        }
                        return err
                }

                if subnet.Spec.ExternalEgressGateway != "" && sub.Spec.ExternalEgressGateway != "" &&
                        subnet.Spec.PolicyRoutingTableID == sub.Spec.PolicyRoutingTableID {
                        err = fmt.Errorf("subnet %s policy routing table ID %d is conflict with subnet %s policy routing table ID %d", subnet.Name, subnet.Spec.PolicyRoutingTableID, sub.Name, sub.Spec.PolicyRoutingTableID)
                        klog.Error(err)
                        if err = c.patchSubnetStatus(subnet, "ValidateLogicalSwitchFailed", err.Error()); err != nil {
                                klog.Error(err)
                                return err
                        }
                        return 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 err
                }
                for _, node := range nodes {
                        for _, addr := range node.Status.Addresses {
                                if addr.Type == v1.NodeInternalIP && util.CIDRContainIP(subnet.Spec.CIDRBlock, addr.Address) {
                                        err = fmt.Errorf("subnet %s cidr %s conflict with node %s address %s", subnet.Name, subnet.Spec.CIDRBlock, node.Name, addr.Address)
                                        klog.Error(err)
                                        if err = c.patchSubnetStatus(subnet, "ValidateLogicalSwitchFailed", err.Error()); err != nil {
                                                klog.Error(err)
                                                return err
                                        }
                                        return err
                                }
                        }
                }
        }
        return nil
}

func (c *Controller) updateSubnetDHCPOption(subnet *kubeovnv1.Subnet, needRouter bool) error {
        var mtu int
        if subnet.Spec.Mtu > 0 {
                mtu = int(subnet.Spec.Mtu)
        } else {
                mtu = util.DefaultMTU
                if subnet.Spec.Vlan == "" {
                        switch c.config.NetworkType {
                        case util.NetworkTypeVlan:
                                // default to geneve
                                fallthrough
                        case util.NetworkTypeGeneve:
                                mtu -= util.GeneveHeaderLength
                        case util.NetworkTypeVxlan:
                                mtu -= util.VxlanHeaderLength
                        case util.NetworkTypeStt:
                                mtu -= util.SttHeaderLength
                        default:
                                return fmt.Errorf("invalid network type: %s", c.config.NetworkType)
                        }
                }
        }

        dhcpOptionsUUIDs, err := c.OVNNbClient.UpdateDHCPOptions(subnet, mtu)
        if err != nil {
                klog.Errorf("failed to update dhcp options for switch %s, %v", subnet.Name, err)
                return err
        }

        vpc, err := c.vpcsLister.Get(subnet.Spec.Vpc)
        if err != nil {
                klog.Errorf("failed to get subnet's vpc '%s', %v", subnet.Spec.Vpc, err)
                return err
        }

        if needRouter {
                lrpName := fmt.Sprintf("%s-%s", vpc.Status.Router, subnet.Name)
                if err := c.OVNNbClient.UpdateLogicalRouterPortRA(lrpName, subnet.Spec.IPv6RAConfigs, subnet.Spec.EnableIPv6RA); err != nil {
                        klog.Errorf("update ipv6 ra configs for logical router port %s, %v", lrpName, err)
                        return err
                }
        }

        if subnet.Status.DHCPv4OptionsUUID != dhcpOptionsUUIDs.DHCPv4OptionsUUID || subnet.Status.DHCPv6OptionsUUID != dhcpOptionsUUIDs.DHCPv6OptionsUUID {
                subnet.Status.DHCPv4OptionsUUID = dhcpOptionsUUIDs.DHCPv4OptionsUUID
                subnet.Status.DHCPv6OptionsUUID = dhcpOptionsUUIDs.DHCPv6OptionsUUID
                bytes, err := subnet.Status.Bytes()
                if err != nil {
                        klog.Error(err)
                        return err
                }
                if _, err := c.config.KubeOvnClient.KubeovnV1().Subnets().Patch(context.Background(), subnet.Name, types.MergePatchType, bytes, metav1.PatchOptions{}, "status"); err != nil {
                        klog.Errorf("patch subnet %s dhcp options failed: %v", subnet.Name, err)
                        return err
                }
        }

        return nil
}

func (c *Controller) handleAddOrUpdateSubnet(key string) error {
        c.subnetKeyMutex.LockKey(key)
        defer func() { _ = c.subnetKeyMutex.UnlockKey(key) }()

        cachedSubnet, err := c.subnetsLister.Get(key)
        if err != nil {
                if k8serrors.IsNotFound(err) {
                        return nil
                }
                klog.Error(err)
                return err
        }
        klog.V(3).Infof("handle add or update subnet %s", cachedSubnet.Name)
        subnet, err := c.formatSubnet(cachedSubnet)
        if err != nil {
                err := fmt.Errorf("failed to format subnet %s, %w", key, err)
                klog.Error(err)
                return err
        }

        err = c.validateSubnetVlan(subnet)
        if err != nil {
                err := fmt.Errorf("failed to validate vlan for subnet %s, %w", key, err)
                klog.Error(err)
                if err = c.patchSubnetStatus(subnet, "ValidateSubnetVlanFailed", err.Error()); err != nil {
                        klog.Error(err)
                        return err
                }
                return err
        }

        if err = util.ValidateSubnet(*subnet); err != nil {
                klog.Errorf("failed to validate subnet %s, %v", subnet.Name, err)
                if err = c.patchSubnetStatus(subnet, "ValidateLogicalSwitchFailed", err.Error()); err != nil {
                        klog.Error(err)
                        return err
                }
                return err
        }
        if err = c.patchSubnetStatus(subnet, "ValidateLogicalSwitchSuccess", ""); err != nil {
                klog.Error(err)
                return err
        }

        if err := c.ipam.AddOrUpdateSubnet(subnet.Name, subnet.Spec.CIDRBlock, subnet.Spec.Gateway, subnet.Spec.ExcludeIps); err != nil {
                klog.Error(err)
                return err
        }

        // availableIPStr valued from ipam, so leave update subnet.status after ipam process
        subnet, err = c.calcSubnetStatusIP(subnet)
        if err != nil {
                klog.Errorf("calculate subnet %s used ip failed, %v", cachedSubnet.Name, err)
                return err
        }

        subnet, deleted, err := c.handleSubnetFinalizer(subnet)
        if err != nil {
                klog.Errorf("handle subnet finalizer failed %v", err)
                return err
        }
        if deleted {
                return nil
        }

        if !isOvnSubnet(subnet) {
                // subnet provider is not ovn, and vpc is empty, should not reconcile
                if err = c.patchSubnetStatus(subnet, "SetNonOvnSubnetSuccess", ""); err != nil {
                        klog.Error(err)
                        return err
                }

                subnet.Status.EnsureStandardConditions()
                klog.Infof("non ovn subnet %s is ready", subnet.Name)
                return nil
        }

        // This validate should be processed after isOvnSubnet, since maybe there's no vpc for subnet not managed by kube-ovn
        vpc, err := c.validateVpcBySubnet(subnet)
        if err != nil {
                klog.Errorf("failed to get subnet's vpc '%s', %v", subnet.Spec.Vpc, err)
                return err
        }
        _, isMcastQuerierChanged, err := c.reconcileSubnetSpecialIPs(subnet)
        if err != nil {
                klog.Errorf("failed to reconcile subnet %s Custom IPs %v", subnet.Name, err)
                return err
        }

        needRouter := subnet.Spec.Vlan == "" || subnet.Spec.LogicalGateway ||
                (subnet.Status.U2OInterconnectionIP != "" && subnet.Spec.U2OInterconnection)
        // 1. overlay subnet, should add lrp, lrp ip is subnet gw
        // 2. underlay subnet use logical gw, should add lrp, lrp ip is subnet gw
        randomAllocateGW := !subnet.Spec.LogicalGateway && vpc.Spec.EnableExternal && subnet.Name == c.config.ExternalGatewaySwitch
        // 3. underlay subnet use physical gw, vpc has eip, lrp managed in vpc process, lrp ip is random allocation, not subnet gw

        gateway := subnet.Spec.Gateway
        var gatewayMAC string
        if subnet.Status.U2OInterconnectionIP != "" && subnet.Spec.U2OInterconnection {
                gateway = subnet.Status.U2OInterconnectionIP
                gatewayMAC = subnet.Status.U2OInterconnectionMAC
        }

        if err := c.clearOldU2OResource(subnet); err != nil {
                klog.Errorf("clear subnet %s old u2o resource failed: %v", subnet.Name, err)
                return err
        }

        // Lock VPC to prevent CIDR conflict between concurrent subnet creations in the same VPC
        c.vpcKeyMutex.LockKey(subnet.Spec.Vpc)
        if err := c.checkSubnetConflict(subnet); err != nil {
                _ = c.vpcKeyMutex.UnlockKey(subnet.Spec.Vpc)
                klog.Errorf("failed to check subnet %s, %v", subnet.Name, err)
                return err
        }
        // create or update logical switch
        if err := c.OVNNbClient.CreateLogicalSwitch(subnet.Name, vpc.Status.Router, subnet.Spec.CIDRBlock, gateway, gatewayMAC, needRouter, randomAllocateGW); err != nil {
                _ = c.vpcKeyMutex.UnlockKey(subnet.Spec.Vpc)
                klog.Errorf("create logical switch %s: %v", subnet.Name, err)
                return err
        }
        _ = c.vpcKeyMutex.UnlockKey(subnet.Spec.Vpc)

        // Record the gateway MAC in ipam if router port exists
        if needRouter {
                routerPortName := ovs.LogicalRouterPortName(vpc.Status.Router, subnet.Name)
                if lrp, err := c.OVNNbClient.GetLogicalRouterPort(routerPortName, true); err == nil && lrp != nil && lrp.MAC != "" {
                        if err := c.ipam.RecordGatewayMAC(subnet.Name, lrp.MAC); err != nil {
                                klog.Warningf("failed to record gateway MAC %s for subnet %s: %v", lrp.MAC, subnet.Name, err)
                        }
                } else {
                        klog.V(3).Infof("router port %s not found or has no MAC, skipping gateway MAC record", routerPortName)
                }
        }

        if isMcastQuerierChanged {
                if err := c.handleMcastQuerierChange(subnet); err != nil {
                        klog.Errorf("failed to handle mcast querier IP change for subnet %s: %v", subnet.Name, err)
                        return err
                }
        }

        subnet.Status.EnsureStandardConditions()

        if err := c.updateSubnetDHCPOption(subnet, needRouter); err != nil {
                klog.Errorf("failed to update subnet %s dhcpOptions: %v", subnet.Name, err)
                return err
        }

        if c.config.EnableLb && subnet.Name != c.config.NodeSwitch {
                lbs := []string{
                        vpc.Status.TCPLoadBalancer,
                        vpc.Status.TCPSessionLoadBalancer,
                        vpc.Status.UDPLoadBalancer,
                        vpc.Status.UDPSessionLoadBalancer,
                        vpc.Status.SctpLoadBalancer,
                        vpc.Status.SctpSessionLoadBalancer,
                }
                if subnet.Spec.EnableLb != nil && *subnet.Spec.EnableLb {
                        if err := c.OVNNbClient.LogicalSwitchUpdateLoadBalancers(subnet.Name, ovsdb.MutateOperationInsert, lbs...); err != nil {
                                if err = c.patchSubnetStatus(subnet, "AddLbToLogicalSwitchFailed", err.Error()); err != nil {
                                        klog.Error(err)
                                        return err
                                }
                                klog.Error(err)
                                return err
                        }
                } else {
                        if err := c.OVNNbClient.LogicalSwitchUpdateLoadBalancers(subnet.Name, ovsdb.MutateOperationDelete, lbs...); err != nil {
                                klog.Errorf("remove load-balancer from subnet %s failed: %v", subnet.Name, err)
                                return err
                        }
                }
        }

        if err := c.reconcileSubnet(subnet); err != nil {
                klog.Errorf("reconcile subnet for %s failed, %v", subnet.Name, err)
                return err
        }

        subnet.Status.U2OInterconnectionVPC = ""
        if subnet.Spec.U2OInterconnection {
                subnet.Status.U2OInterconnectionVPC = vpc.Status.Router
        }

        if err = c.updateNatOutgoingPolicyRulesStatus(subnet); err != nil {
                klog.Errorf("failed to update NAT outgoing policy status for subnet %s: %v", subnet.Name, err)
                return err
        }

        if subnet.Spec.Private {
                if err := c.OVNNbClient.SetLogicalSwitchPrivate(subnet.Name, subnet.Spec.CIDRBlock, c.config.NodeSwitchCIDR, subnet.Spec.AllowSubnets); err != nil {
                        if err = c.patchSubnetStatus(subnet, "SetPrivateLogicalSwitchFailed", err.Error()); err != nil {
                                klog.Error(err)
                                return err
                        }
                        klog.Error(err)
                        return err
                }

                if err = c.patchSubnetStatus(subnet, "SetPrivateLogicalSwitchSuccess", ""); err != nil {
                        klog.Error(err)
                        return err
                }
        } else {
                // clear acl when direction is ""
                if err = c.OVNNbClient.DeleteAcls(subnet.Name, logicalSwitchKey, "", nil); err != nil {
                        if err = c.patchSubnetStatus(subnet, "ResetLogicalSwitchAclFailed", err.Error()); err != nil {
                                klog.Error(err)
                                return err
                        }
                        klog.Error(err)
                        return err
                }

                if err = c.patchSubnetStatus(subnet, "ResetLogicalSwitchAclSuccess", ""); err != nil {
                        klog.Error(err)
                        return err
                }
        }

        if err := c.OVNNbClient.UpdateLogicalSwitchACL(subnet.Name, subnet.Spec.CIDRBlock, subnet.Spec.Acls, subnet.Spec.AllowEWTraffic); err != nil {
                if err = c.patchSubnetStatus(subnet, "SetLogicalSwitchAclsFailed", err.Error()); err != nil {
                        klog.Error(err)
                        return err
                }
                klog.Error(err)
                return err
        }

        c.updateVpcStatusQueue.Add(subnet.Spec.Vpc)

        ippools, err := c.ippoolLister.List(labels.Everything())
        if err != nil {
                klog.Errorf("failed to list ippools: %v", err)
                return err
        }

        for _, p := range ippools {
                if p.Spec.Subnet == subnet.Name {
                        c.addOrUpdateIPPoolQueue.Add(p.Name)
                }
        }

        return nil
}

func (c *Controller) handleDeleteLogicalSwitch(key string) (err error) {
        c.ipam.DeleteSubnet(key)

        exist, err := c.OVNNbClient.LogicalSwitchExists(key)
        if err != nil {
                klog.Errorf("check logical switch %s exist: %v", key, err)
                return err
        }

        // not found, skip
        if !exist {
                return nil
        }

        // clear acl when direction is ""
        if err = c.OVNNbClient.DeleteAcls(key, logicalSwitchKey, "", nil); err != nil {
                klog.Errorf("clear logical switch %s acls: %v", key, err)
                return err
        }

        if err = c.OVNNbClient.DeleteDHCPOptions(key, kubeovnv1.ProtocolDual); err != nil {
                klog.Errorf("failed to delete dhcp options of logical switch %s %v", key, err)
                return err
        }

        if err = c.OVNNbClient.DeleteLogicalSwitch(key); err != nil {
                klog.Errorf("delete logical switch %s: %v", key, err)
                return err
        }

        nss, err := c.namespacesLister.List(labels.Everything())
        if err != nil {
                klog.Errorf("failed to list namespaces, %v", err)
                return err
        }

        // re-annotate namespace
        for _, ns := range nss {
                annotations := ns.GetAnnotations()
                if annotations == nil {
                        continue
                }

                if slices.Contains(strings.Split(annotations[util.LogicalSwitchAnnotation], ","), key) {
                        c.enqueueAddNamespace(ns)
                }
        }

        return c.delLocalnet(key)
}

func (c *Controller) handleDeleteSubnet(subnet *kubeovnv1.Subnet) error {
        c.subnetKeyMutex.LockKey(subnet.Name)
        defer func() { _ = c.subnetKeyMutex.UnlockKey(subnet.Name) }()

        c.updateVpcStatusQueue.Add(subnet.Spec.Vpc)
        klog.Infof("delete u2o interconnection policy route for subnet %s", subnet.Name)
        if err := c.deletePolicyRouteForU2OInterconn(subnet); err != nil {
                klog.Errorf("failed to delete policy route for underlay to overlay subnet interconnection %s, %v", subnet.Name, err)
                return err
        }
        if subnet.Spec.Vpc != c.config.ClusterRouter {
                if err := c.deleteStaticRouteForU2OInterconn(subnet); err != nil {
                        klog.Errorf("failed to delete static route for underlay to overlay subnet interconnection %s, %v", subnet.Name, err)
                        return err
                }
        }

        u2oInterconnName := fmt.Sprintf(util.U2OInterconnName, subnet.Spec.Vpc, subnet.Name)
        if err := c.config.KubeOvnClient.KubeovnV1().IPs().Delete(context.Background(), u2oInterconnName, metav1.DeleteOptions{}); err != nil {
                if !k8serrors.IsNotFound(err) {
                        klog.Errorf("failed to delete ip %s, %v", u2oInterconnName, err)
                        return err
                }
        }

        if subnet.Spec.Vpc != c.config.ClusterRouter {
                if err := c.deleteCustomVPCPolicyRoutesForSubnet(subnet); err != nil {
                        klog.Errorf("failed to delete custom vpc routes subnet %s, %v", subnet.Name, err)
                        return err
                }
        }

        klog.Infof("delete policy route for %s subnet %s", subnet.Spec.GatewayType, subnet.Name)
        if err := c.deletePolicyRouteByGatewayType(subnet, subnet.Spec.GatewayType, true); err != nil {
                klog.Errorf("failed to delete policy route for overlay subnet %s, %v", subnet.Name, err)
                return err
        }

        err := c.handleDeleteLogicalSwitch(subnet.Name)
        if err != nil {
                klog.Errorf("failed to delete logical switch %s %v", subnet.Name, err)
                return err
        }

        var router string
        vpc, err := c.vpcsLister.Get(subnet.Spec.Vpc)
        if err != nil {
                if !k8serrors.IsNotFound(err) {
                        klog.Errorf("get vpc %s: %v", vpc.Name, err)
                        return err
                }
                router = c.config.ClusterRouter
        } else {
                router = vpc.Status.Router
        }

        lspName := fmt.Sprintf("%s-%s", subnet.Name, router)
        lrpName := fmt.Sprintf("%s-%s", router, subnet.Name)
        if err = c.OVNNbClient.RemoveLogicalPatchPort(lspName, lrpName); err != nil {
                klog.Errorf("delete router port %s and %s:%v", lspName, lrpName, err)
                return err
        }

        vlans, err := c.vlansLister.List(labels.Everything())
        if err != nil && !k8serrors.IsNotFound(err) {
                klog.Errorf("failed to list vlans: %v", err)
                return err
        }

        for _, vlan := range vlans {
                if err = c.updateVlanStatusForSubnetDeletion(vlan, subnet.Name); err != nil {
                        klog.Error(err)
                        return err
                }
        }

        return nil
}

func (c *Controller) updateVlanStatusForSubnetDeletion(vlan *kubeovnv1.Vlan, subnet string) error {
        if !slices.Contains(vlan.Status.Subnets, subnet) {
                return nil
        }

        newVlan := vlan.DeepCopy()
        newVlan.Status.Subnets = util.RemoveString(newVlan.Status.Subnets, subnet)
        _, err := c.config.KubeOvnClient.KubeovnV1().Vlans().UpdateStatus(context.Background(), newVlan, metav1.UpdateOptions{})
        if err != nil {
                klog.Errorf("failed to update status of vlan %s: %v", vlan.Name, err)
                return err
        }

        return nil
}

func (c *Controller) reconcileSubnet(subnet *kubeovnv1.Subnet) error {
        if err := c.reconcileNamespaces(subnet); err != nil {
                klog.Errorf("reconcile namespaces for subnet %s failed, %v", subnet.Name, err)
                return err
        }

        if err := c.reconcileRouteTableForSubnet(subnet); err != nil {
                klog.Errorf("reconcile route table for subnet %s failed, %v", subnet.Name, err)
                return err
        }

        if subnet.Spec.Vpc == c.config.ClusterRouter {
                if err := c.reconcileOvnDefaultVpcRoute(subnet); err != nil {
                        klog.Errorf("reconcile default vpc ovn route for subnet %s failed: %v", subnet.Name, err)
                        return err
                }
        } else if err := c.reconcileCustomVpcStaticRoute(subnet); err != nil {
                klog.Errorf("reconcile custom vpc ovn route for subnet %s failed: %v", subnet.Name, err)
                return err
        }

        if err := c.reconcileVlan(subnet); err != nil {
                klog.Errorf("reconcile vlan for subnet %s failed, %v", subnet.Name, err)
                return err
        }

        if err := c.reconcileVips(subnet); err != nil {
                klog.Errorf("reconcile vips for subnet %s failed, %v", subnet.Name, err)
                return err
        }
        return nil
}

func (c *Controller) reconcileVips(subnet *kubeovnv1.Subnet) error {
        /* get all virtual port belongs to this logical switch */
        lsps, err := c.OVNNbClient.ListLogicalSwitchPorts(true, map[string]string{logicalSwitchKey: subnet.Name}, func(lsp *ovnnb.LogicalSwitchPort) bool {
                return lsp.Type == "virtual"
        })
        if err != nil {
                klog.Errorf("failed to find virtual port for subnet %s: %v", subnet.Name, err)
                return err
        }

        /* filter all invalid virtual port */
        existVips := make(map[string]string) // key is vip, value is port name
        for _, lsp := range lsps {
                vip, ok := lsp.Options["virtual-ip"]
                if !ok {
                        continue // ignore vip which is empty
                }

                if net.ParseIP(vip) == nil {
                        continue // ignore invalid vip
                }

                existVips[vip] = lsp.Name
        }

        /* filter virtual port to be added and old virtual port to be deleted */
        var newVips []string
        for _, vip := range subnet.Spec.Vips {
                if _, ok := existVips[vip]; !ok {
                        // new virtual port to be added
                        newVips = append(newVips, vip)
                } else {
                        // delete old virtual port that do not need to be deleted
                        delete(existVips, vip)
                }
        }

        // delete old virtual ports
        for _, lspName := range existVips {
                if err = c.OVNNbClient.DeleteLogicalSwitchPort(lspName); err != nil {
                        klog.Errorf("delete virtual port %s lspName from logical switch %s: %v", lspName, subnet.Name, err)
                        return err
                }
        }

        // add new virtual port
        if err = c.OVNNbClient.CreateVirtualLogicalSwitchPorts(subnet.Name, newVips...); err != nil {
                klog.Errorf("create virtual port with vips %v from logical switch %s: %v", newVips, subnet.Name, err)
                return err
        }

        c.syncVirtualPortsQueue.Add(subnet.Name)
        return nil
}

func (c *Controller) syncVirtualPort(key string) error {
        subnet, err := c.subnetsLister.Get(key)
        if err != nil {
                if k8serrors.IsNotFound(err) {
                        return nil
                }
                klog.Errorf("failed to get subnet %s, %v", key, err)
                return err
        }
        if len(subnet.Spec.Vips) == 0 {
                return nil
        }

        externalIDs := map[string]string{
                logicalSwitchKey: subnet.Name,
                "attach-vips":    "true",
        }

        lsps, err := c.OVNNbClient.ListNormalLogicalSwitchPorts(true, externalIDs)
        if err != nil {
                klog.Errorf("list logical switch %s ports: %v", subnet.Name, err)
                return err
        }

        for _, vip := range subnet.Spec.Vips {
                if !util.CIDRContainIP(subnet.Spec.CIDRBlock, vip) {
                        klog.Errorf("vip %s is out of range to subnet %s", vip, subnet.Name)
                        continue
                }

                var virtualParents []string
                for _, lsp := range lsps {
                        vips, ok := lsp.ExternalIDs["vips"]
                        if !ok {
                                continue // ignore vips which is empty
                        }

                        if strings.Contains(vips, vip) {
                                virtualParents = append(virtualParents, lsp.Name)
                        }
                }

                // logical switch port has no valid vip
                if len(virtualParents) == 0 {
                        continue
                }

                if err = c.OVNNbClient.SetLogicalSwitchPortVirtualParents(subnet.Name, strings.Join(virtualParents, ","), vip); err != nil {
                        klog.Errorf("set vip %s virtual parents %v: %v", vip, virtualParents, err)
                        return err
                }
        }

        return nil
}

func (c *Controller) reconcileNamespaces(subnet *kubeovnv1.Subnet) error {
        var (
                namespaces []*v1.Namespace
                err        error
        )

        // 1. get all namespaces should be updated
        expectNss, err := c.getNamespacesBySelector(subnet.Spec.NamespaceSelectors)
        if err != nil {
                klog.Errorf("failed to list namespaces by selector, %v", err)
                return err
        }
        for _, ns := range subnet.Spec.Namespaces {
                if !slices.Contains(expectNss, ns) {
                        expectNss = append(expectNss, ns)
                }
        }

        // 2. update namespaces
        for _, expectNs := range expectNss {
                checkNs, err := c.namespacesLister.Get(expectNs)
                if err != nil {
                        if k8serrors.IsNotFound(err) {
                                continue
                        }
                        klog.Error(err)
                        return err
                }
                if checkNs.Annotations != nil && slices.Contains(strings.Split(checkNs.Annotations[util.LogicalSwitchAnnotation], ","), subnet.Name) {
                        // when subnet cidr changed, the ns annotation with the subnet should be updated
                        if !slices.Contains(strings.Split(checkNs.Annotations[util.CidrAnnotation], ";"), subnet.Spec.CIDRBlock) {
                                c.addNamespaceQueue.Add(checkNs.Name)
                        }
                        continue
                }
                c.addNamespaceQueue.Add(expectNs)
        }

        // 3. update unbind namespace annotation
        if namespaces, err = c.namespacesLister.List(labels.Everything()); err != nil {
                klog.Errorf("failed to list namespaces, %v", err)
                return err
        }

        for _, ns := range namespaces {
                if ns.Annotations != nil && slices.Contains(strings.Split(ns.Annotations[util.LogicalSwitchAnnotation], ","), subnet.Name) {
                        if slices.Contains(expectNss, ns.Name) {
                                continue
                        }
                        // ns deleted from subnet.Spec.Namespaces or subnet delete namespaceSelectors which match the checked namespace
                        c.addNamespaceQueue.Add(ns.Name)
                }
        }

        return nil
}

func (c *Controller) getNamespacesBySelector(nsSelectors []metav1.LabelSelector) ([]string, error) {
        var expectNss []string
        for _, nsSelector := range nsSelectors {
                matchSelector, err := metav1.LabelSelectorAsSelector(&nsSelector)
                if err != nil {
                        klog.Errorf("failed to convert label selector, %v", err)
                        return expectNss, err
                }

                nss, err := c.namespacesLister.List(matchSelector)
                if err != nil {
                        klog.Errorf("failed to list namespaces by selector, %v", err)
                        return expectNss, err
                }
                for _, ns := range nss {
                        expectNss = append(expectNss, ns.Name)
                }
        }
        return expectNss, nil
}

func (c *Controller) reconcileCustomVpcBfdStaticRoute(vpcName, subnetName string) error {
        // vpc enable bfd and subnet enable ecmp
        // use static ecmp route with bfd
        ovnEips, err := c.ovnEipsLister.List(labels.SelectorFromSet(labels.Set{util.OvnEipTypeLabel: util.OvnEipTypeLSP}))
        if err != nil {
                klog.Errorf("failed to list node external ovn eip, %v", err)
                return err
        }
        if len(ovnEips) < 2 {
                err := fmt.Errorf("ecmp route with bfd for HA, which need two %s type eips at least, has %d", util.OvnEipTypeLSP, len(ovnEips))
                klog.Error(err)
                return err
        }

        subnet, err := c.subnetsLister.Get(subnetName)
        if err != nil {
                klog.Errorf("failed to get subnet %s, %v", subnetName, err)
                return err
        }
        cachedVpc, err := c.vpcsLister.Get(vpcName)
        if err != nil {
                if k8serrors.IsNotFound(err) {
                        return nil
                }
                klog.Errorf("failed to get vpc %s, %v", vpcName, err)
                return err
        }

        var (
                needUpdate, v4Exist bool
                lrpEipName          string
        )

        lrpEipName = fmt.Sprintf("%s-%s", vpcName, c.config.ExternalGatewaySwitch)
        lrpEip, err := c.ovnEipsLister.Get(lrpEipName)
        if err != nil {
                err := fmt.Errorf("failed to get lrp eip %s, %w", lrpEipName, err)
                klog.Error(err)
                return err
        }
        if !lrpEip.Status.Ready || lrpEip.Status.V4Ip == "" {
                err := fmt.Errorf("lrp eip %q not ready", lrpEipName)
                klog.Error(err)
                return err
        }
        vpc := cachedVpc.DeepCopy()

        for _, eip := range ovnEips {
                if !eip.Status.Ready || eip.Status.V4Ip == "" {
                        err := fmt.Errorf("ovn eip %q not ready", eip.Name)
                        klog.Error(err)
                        return err
                }
                bfd, err := c.OVNNbClient.CreateBFD(lrpEipName, eip.Status.V4Ip, c.config.BfdMinRx, c.config.BfdMinTx, c.config.BfdDetectMult, nil)
                if err != nil {
                        klog.Error(err)
                        return err
                }
                // TODO:// support v6
                v4Exist = false
                for _, route := range vpc.Spec.StaticRoutes {
                        if route.Policy == kubeovnv1.PolicySrc &&
                                route.NextHopIP == eip.Status.V4Ip &&
                                route.ECMPMode == util.StaticRouteBfdEcmp &&
                                route.CIDR == subnet.Spec.CIDRBlock &&
                                route.RouteTable == subnet.Spec.RouteTable {
                                v4Exist = true
                                break
                        }
                }
                if !v4Exist {
                        // add ecmp type static route with bfd
                        route := &kubeovnv1.StaticRoute{
                                Policy:     kubeovnv1.PolicySrc,
                                CIDR:       subnet.Spec.CIDRBlock,
                                NextHopIP:  eip.Status.V4Ip,
                                ECMPMode:   util.StaticRouteBfdEcmp,
                                BfdID:      bfd.UUID,
                                RouteTable: subnet.Spec.RouteTable,
                        }
                        klog.Infof("add ecmp bfd static route %v", route)
                        vpc.Spec.StaticRoutes = append(vpc.Spec.StaticRoutes, route)
                        needUpdate = true
                }
        }
        if needUpdate {
                if _, err = c.config.KubeOvnClient.KubeovnV1().Vpcs().Update(context.Background(), vpc, metav1.UpdateOptions{}); err != nil {
                        klog.Errorf("failed to update vpc spec static route %s, %v", vpc.Name, err)
                        return err
                }
                if err = c.patchVpcBfdStatus(vpc.Name); err != nil {
                        klog.Errorf("failed to patch vpc %s, %v", vpc.Name, err)
                        return err
                }
        }
        return nil
}

func (c *Controller) reconcileCustomVpcDelNormalStaticRoute(vpcName string) error {
        // normal static route is prior than ecmp bfd static route
        // if use ecmp bfd static route, normal static route should not exist
        defaultExternalSubnet, err := c.subnetsLister.Get(c.config.ExternalGatewaySwitch)
        if err != nil {
                klog.Errorf("failed to get default external switch subnet %s: %v", c.config.ExternalGatewaySwitch, err)
                return err
        }
        gatewayV4, gatewayV6 := util.SplitStringIP(defaultExternalSubnet.Spec.Gateway)
        needUpdate := false
        vpc, err := c.vpcsLister.Get(vpcName)
        if err != nil {
                if k8serrors.IsNotFound(err) {
                        return nil
                }
                klog.Errorf("failed to get vpc %s, %v", vpcName, err)
                return err
        }
        routeTotal := len(vpc.Spec.StaticRoutes)
        routes := make([]*kubeovnv1.StaticRoute, 0, routeTotal)
        for _, route := range vpc.Spec.StaticRoutes {
                if route.Policy == kubeovnv1.PolicyDst &&
                        (route.NextHopIP == gatewayV4 || route.NextHopIP == gatewayV6) &&
                        (route.CIDR == "0.0.0.0/0" || route.CIDR == "::/0") {
                        klog.Infof("in order to use ecmp bfd route, need remove normal static route %v", route)
                        needUpdate = true
                } else {
                        routes = append(routes, route)
                }
        }

        if needUpdate {
                vpc.Spec.StaticRoutes = routes
                if _, err = c.config.KubeOvnClient.KubeovnV1().Vpcs().Update(context.Background(), vpc, metav1.UpdateOptions{}); err != nil {
                        klog.Errorf("failed to update vpc spec static route %s, %v", vpc.Name, err)
                        return err
                }
        }

        if err = c.patchVpcBfdStatus(vpc.Name); err != nil {
                klog.Errorf("failed to patch vpc %s, %v", vpc.Name, err)
                return err
        }

        return nil
}

func (c *Controller) reconcileDistributedSubnetRouteInDefaultVpc(subnet *kubeovnv1.Subnet) error {
        if subnet.Spec.GatewayNode != "" || subnet.Status.ActivateGateway != "" {
                klog.Infof("delete old centralized policy route for subnet %s", subnet.Name)
                if err := c.deletePolicyRouteForCentralizedSubnet(subnet); err != nil {
                        klog.Errorf("failed to delete policy route for subnet %s, %v", subnet.Name, err)
                        return err
                }

                subnet.Spec.GatewayNode = ""
                if _, err := c.config.KubeOvnClient.KubeovnV1().Subnets().Update(context.Background(), subnet, metav1.UpdateOptions{}); err != nil {
                        klog.Errorf("failed to remove gatewayNode or activateGateway from subnet %s, %v", subnet.Name, err)
                        return err
                }
                subnet.Status.ActivateGateway = ""
                if err := c.patchSubnetStatus(subnet, "ChangeToDistributedGw", ""); err != nil {
                        klog.Error(err)
                        return err
                }
        }

        nodes, err := c.nodesLister.List(labels.Everything())
        if err != nil {
                klog.Errorf("failed to list nodes: %v", err)
                return err
        }
        for _, node := range nodes {
                if err = c.createPortGroupForDistributedSubnet(node, subnet); err != nil {
                        klog.Errorf("failed to create port group %v", err)
                        return err
                }
                if node.Annotations[util.AllocatedAnnotation] != "true" {
                        klog.Warningf("node %s has not been successfully initialized, skip adding policy route for subnet %s", node.Name, subnet.Name)
                        continue
                }
                nodeIP, err := getNodeTunlIP(node)
                if err != nil {
                        klog.Errorf("failed to get node %s tunnel ip, %v", node.Name, err)
                        return err
                }
                nextHop := getNextHopByTunnelIP(nodeIP)
                v4IP, v6IP := util.SplitStringIP(nextHop)
                if err = c.addPolicyRouteForDistributedSubnet(subnet, node.Name, v4IP, v6IP); err != nil {
                        klog.Errorf("failed to add policy router for node %s and subnet %s: %v", node.Name, subnet.Name, err)
                        return err
                }
        }

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

        pods, err := c.podsLister.Pods(metav1.NamespaceAll).List(labels.Everything())
        if err != nil {
                klog.Errorf("failed to list pods %v", err)
                return err
        }
        for _, pod := range pods {
                if !isPodAlive(pod) || pod.Spec.NodeName == "" {
                        continue
                }

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

                podPorts := make([]string, 0, 1)
                for _, podNet := range podNets {
                        if !isOvnSubnet(podNet.Subnet) {
                                continue
                        }

                        if pod.Annotations[fmt.Sprintf(util.IPAddressAnnotationTemplate, podNet.ProviderName)] == "" || pod.Annotations[fmt.Sprintf(util.LogicalSwitchAnnotationTemplate, podNet.ProviderName)] != subnet.Name {
                                continue
                        }

                        podName := c.getNameByPod(pod)
                        portName := ovs.PodNameToPortName(podName, pod.Namespace, podNet.ProviderName)
                        podPorts = append(podPorts, portName)
                }

                pgName := getOverlaySubnetsPortGroupName(subnet.Name, pod.Spec.NodeName)
                portsToAdd := make([]string, 0, len(podPorts))
                for _, port := range podPorts {
                        exist, err := c.OVNNbClient.LogicalSwitchPortExists(port)
                        if err != nil {
                                klog.Error(err)
                                return err
                        }

                        if !exist {
                                klog.Errorf("lsp does not exist for pod %v, please delete the pod and retry", port)
                                continue
                        }

                        portsToAdd = append(portsToAdd, port)
                }

                // 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
                for _, pg := range portGroups {
                        if pg.Name == pgName {
                                continue
                        }
                        if err = c.OVNNbClient.PortGroupRemovePorts(pg.Name, podPorts...); err != nil {
                                klog.Errorf("remove ports from port group %s: %v", pg.Name, err)
                                return err
                        }
                }
                // add ports to the port group
                if err = c.OVNNbClient.PortGroupAddPorts(pgName, portsToAdd...); err != nil {
                        klog.Errorf("add ports to port group %s: %v", pgName, err)
                        return err
                }
        }
        return nil
}

func (c *Controller) reconcileDefaultCentralizedSubnetRouteInDefaultVpc(subnet *kubeovnv1.Subnet) error {
        gatewayNodes, err := c.getGatewayNodes(subnet)
        if err != nil {
                klog.Errorf("failed to get gateway nodes for subnet %s: %v", subnet.Name, err)
                return err
        }

        // check if activateGateway still ready
        if subnet.Status.ActivateGateway != "" && slices.Contains(gatewayNodes, subnet.Status.ActivateGateway) {
                node, err := c.nodesLister.Get(subnet.Status.ActivateGateway)
                if err == nil && nodeReady(node) {
                        klog.Infof("subnet %s uses the old activate gw %s", subnet.Name, node.Name)

                        nodeTunlIPAddr, err := getNodeTunlIP(node)
                        if err != nil {
                                klog.Errorf("failed to get gatewayNode tunnel ip for subnet %s", subnet.Name)
                                return err
                        }
                        nextHop := getNextHopByTunnelIP(nodeTunlIPAddr)
                        if err = c.addPolicyRouteForCentralizedSubnet(subnet, subnet.Status.ActivateGateway, nil, strings.Split(nextHop, ",")); err != nil {
                                klog.Errorf("failed to add active-backup policy route for centralized subnet %s: %v", subnet.Name, err)
                                return err
                        }
                        return nil
                }
        }

        klog.Info("find a new activate node")
        // need a new activate gateway
        newActivateNode := ""
        var nodeTunlIPAddr []net.IP
        for _, gw := range gatewayNodes {
                node, err := c.nodesLister.Get(gw)
                if err == nil && nodeReady(node) {
                        newActivateNode = node.Name
                        nodeTunlIPAddr, err = getNodeTunlIP(node)
                        if err != nil {
                                klog.Error(err)
                                return err
                        }
                        klog.Infof("subnet %s uses a new activate gw %s", subnet.Name, node.Name)
                        break
                }
        }
        if newActivateNode == "" {
                klog.Warningf("all gateways of subnet %s are not ready", subnet.Name)
                subnet.Status.ActivateGateway = newActivateNode
                if err := c.patchSubnetStatus(subnet, "NoActiveGatewayFound", fmt.Sprintf("subnet %s gws are not ready", subnet.Name)); err != nil {
                        klog.Error(err)
                        return err
                }

                return fmt.Errorf("subnet %s gws are not ready", subnet.Name)
        }

        nextHop := getNextHopByTunnelIP(nodeTunlIPAddr)
        klog.Infof("subnet %s configure new gateway node, nextHop %s", subnet.Name, nextHop)
        if err := c.addPolicyRouteForCentralizedSubnet(subnet, newActivateNode, nil, strings.Split(nextHop, ",")); err != nil {
                klog.Errorf("failed to add policy route for active-backup centralized subnet %s: %v", subnet.Name, err)
                return err
        }
        subnet.Status.ActivateGateway = newActivateNode
        if err := c.patchSubnetStatus(subnet, "ReconcileCentralizedGatewaySuccess", ""); err != nil {
                klog.Error(err)
                return err
        }

        klog.Infof("delete old distributed policy route for subnet %s", subnet.Name)
        if err := c.deletePolicyRouteByGatewayType(subnet, kubeovnv1.GWDistributedType, false); err != nil {
                klog.Errorf("failed to delete policy route for overlay subnet %s, %v", subnet.Name, err)
                return err
        }
        return nil
}

func (c *Controller) reconcileEcmpCentralizedSubnetRouteInDefaultVpc(subnet *kubeovnv1.Subnet) error {
        gatewayNodes, err := c.getGatewayNodes(subnet)
        if err != nil {
                klog.Errorf("failed to get gateway nodes for subnet %s: %v", subnet.Name, err)
                return err
        }

        nodeIPs := [2][]string{make([]string, 0, len(gatewayNodes)), make([]string, 0, len(gatewayNodes))}
        nameIPMaps := [2]map[string]string{make(map[string]string, len(gatewayNodes)), make(map[string]string, len(gatewayNodes))}

        for _, gw := range gatewayNodes {
                node, err := c.nodesLister.Get(gw)
                if err != nil {
                        klog.Errorf("failed to get gw node %s, %v", gw, err)
                        continue
                }
                if !nodeReady(node) {
                        klog.Errorf("gateway node %v is not ready", gw)
                        continue
                }
                nexthopNodeIP := strings.TrimSpace(node.Annotations[util.IPAddressAnnotation])
                if nexthopNodeIP == "" {
                        klog.Errorf("gateway node %v has no ip annotation", node.Name)
                        continue
                }
                nexthopV4, nexthopV6 := util.SplitStringIP(nexthopNodeIP)
                if nexthopV4 != "" {
                        nameIPMaps[0][node.Name] = nexthopV4
                        nodeIPs[0] = append(nodeIPs[0], nexthopV4)
                }
                if nexthopV6 != "" {
                        nameIPMaps[1][node.Name] = nexthopV6
                        nodeIPs[1] = append(nodeIPs[1], nexthopV6)
                }
        }

        v4CIDR, v6CIDR := util.SplitStringIP(subnet.Spec.CIDRBlock)
        cidrs := [2]string{v4CIDR, v6CIDR}
        for i, cidr := range cidrs {
                if len(nodeIPs[i]) == 0 || cidr == "" {
                        continue
                }
                klog.Infof("delete old distributed policy route for subnet %s", subnet.Name)
                if err := c.deletePolicyRouteByGatewayType(subnet, kubeovnv1.GWDistributedType, false); err != nil {
                        klog.Errorf("failed to delete policy route for overlay subnet %s, %v", subnet.Name, err)
                        return err
                }
                klog.Infof("subnet %s configure ecmp policy route, nexthops %v", subnet.Name, nodeIPs[i])
                if err := c.updatePolicyRouteForCentralizedSubnet(subnet.Name, cidr, nodeIPs[i], nameIPMaps[i]); err != nil {
                        klog.Errorf("failed to add ecmp policy route for centralized subnet %s: %v", subnet.Name, err)
                        return err
                }
        }
        return nil
}

func (c *Controller) reconcileOvnDefaultVpcRoute(subnet *kubeovnv1.Subnet) error {
        if subnet.Name == c.config.NodeSwitch {
                if err := c.addCommonRoutesForSubnet(subnet); err != nil {
                        klog.Error(err)
                        return err
                }
                return nil
        }

        if subnet.Spec.Vlan != "" && !subnet.Spec.LogicalGateway {
                // physical switch provide gw for this underlay subnet
                pods, err := c.podsLister.Pods(metav1.NamespaceAll).List(labels.Everything())
                if err != nil {
                        klog.Errorf("failed to list pods %v", err)
                        return err
                }
                for _, pod := range pods {
                        if pod.Annotations[util.LogicalSwitchAnnotation] == subnet.Name && pod.Annotations[util.IPAddressAnnotation] != "" {
                                if err := c.deleteStaticRoute(
                                        pod.Annotations[util.IPAddressAnnotation], c.config.ClusterRouter, subnet.Spec.RouteTable); err != nil {
                                        klog.Errorf("failed to delete static route %v", err)
                                        return err
                                }
                        }
                }

                if !subnet.Spec.LogicalGateway && subnet.Name != c.config.ExternalGatewaySwitch && !subnet.Spec.U2OInterconnection {
                        lspName := fmt.Sprintf("%s-%s", subnet.Name, c.config.ClusterRouter)
                        klog.Infof("delete logical switch port %s", lspName)
                        if err := c.OVNNbClient.DeleteLogicalSwitchPort(lspName); err != nil {
                                klog.Errorf("failed to delete lsp %s-%s, %v", subnet.Name, c.config.ClusterRouter, err)
                                return err
                        }
                        lrpName := fmt.Sprintf("%s-%s", c.config.ClusterRouter, subnet.Name)
                        klog.Infof("delete logical router port %s", lrpName)
                        if err := c.OVNNbClient.DeleteLogicalRouterPort(lrpName); err != nil {
                                klog.Errorf("failed to delete lrp %s: %v", lrpName, err)
                                return err
                        }
                }

                if subnet.Spec.U2OInterconnection && subnet.Status.U2OInterconnectionIP != "" {
                        if err := c.addPolicyRouteForU2OInterconn(subnet); err != nil {
                                klog.Errorf("failed to add policy route for underlay to overlay subnet interconnection %s %v", subnet.Name, err)
                                return err
                        }
                } else {
                        if err := c.deletePolicyRouteForU2OInterconn(subnet); err != nil {
                                klog.Errorf("failed to delete policy route for underlay to overlay subnet interconnection %s, %v", subnet.Name, err)
                                return err
                        }
                }

                if (!c.config.EnableLb || (subnet.Spec.EnableLb == nil || !*subnet.Spec.EnableLb)) &&
                        subnet.Spec.U2OInterconnection && subnet.Status.U2OInterconnectionIP != "" {
                        if err := c.addPolicyRouteForU2ONoLoadBalancer(subnet); err != nil {
                                klog.Errorf("failed to add policy route for underlay to overlay subnet interconnection without enabling loadbalancer %s %v", subnet.Name, err)
                                return err
                        }
                } else {
                        if err := c.deletePolicyRouteForU2ONoLoadBalancer(subnet); err != nil {
                                klog.Errorf("failed to delete policy route for underlay to overlay subnet interconnection without enabling loadbalancer %s, %v", subnet.Name, err)
                                return err
                        }
                }
        } else {
                // It's difficult to update policy route when subnet cidr is changed, add check for cidr changed situation
                if err := c.reconcilePolicyRouteForCidrChangedSubnet(subnet, true); err != nil {
                        klog.Error(err)
                        return err
                }

                if err := c.addCommonRoutesForSubnet(subnet); err != nil {
                        klog.Error(err)
                        return err
                }

                // distributed subnet, only add distributed policy route
                if subnet.Spec.GatewayType == kubeovnv1.GWDistributedType {
                        if err := c.reconcileDistributedSubnetRouteInDefaultVpc(subnet); err != nil {
                                klog.Error(err)
                                return err
                        }
                } else {
                        // centralized subnet
                        if subnet.Spec.GatewayNode == "" && len(subnet.Spec.GatewayNodeSelectors) == 0 {
                                subnet.Status.NotReady("NoReadyGateway", "")
                                if err := c.patchSubnetStatus(subnet, "NoReadyGateway", ""); err != nil {
                                        klog.Error(err)
                                        return err
                                }
                                err := fmt.Errorf("subnet %s Spec.GatewayNode or Spec.GatewayNodeSelectors must be specified for centralized gateway type", subnet.Name)
                                klog.Error(err)
                                return err
                        }

                        gwNodeExists := c.checkSubnetGwNodesExist(subnet)
                        if !gwNodeExists {
                                klog.Errorf("failed to init centralized gateway for subnet %s, no gateway node exists", subnet.Name)
                                return errors.New("failed to add ecmp policy route, no gateway node exists")
                        }

                        if err := c.reconcilePolicyRouteForCidrChangedSubnet(subnet, false); err != nil {
                                klog.Error(err)
                                return err
                        }

                        if subnet.Spec.EnableEcmp {
                                if err := c.reconcileEcmpCentralizedSubnetRouteInDefaultVpc(subnet); err != nil {
                                        klog.Error(err)
                                        return err
                                }
                        } else {
                                if err := c.reconcileDefaultCentralizedSubnetRouteInDefaultVpc(subnet); err != nil {
                                        klog.Error(err)
                                        return err
                                }
                        }
                }
        }
        return nil
}

func (c *Controller) reconcileCustomVpcStaticRoute(subnet *kubeovnv1.Subnet) error {
        // in custom vpc, subnet gw type is unmeaning
        // 1. vpc out to public network through vpc nat gw pod, the static route is auto managed by admin user
        // 2. vpc out to public network through ovn nat lrp, whose nexthop rely on bfd ecmp, the vpc spec bfd static route is auto managed here
        // 3. vpc out to public network through ovn nat lrp, without bfd ecmp, the vpc spec static route is auto managed here

        vpc, err := c.vpcsLister.Get(subnet.Spec.Vpc)
        if err != nil {
                if k8serrors.IsNotFound(err) {
                        return nil
                }
                klog.Errorf("failed to get vpc %s, %v", subnet.Spec.Vpc, err)
                return err
        }

        if vpc.Spec.EnableExternal && vpc.Spec.EnableBfd && subnet.Spec.EnableEcmp {
                klog.Infof("add bfd and external static ecmp route for vpc %s, subnet %s", vpc.Name, subnet.Name)
                // handle vpc static route
                // use static ecmp route with bfd
                // bfd ecmp static route depend on subnet cidr
                if err := c.reconcileCustomVpcBfdStaticRoute(vpc.Name, subnet.Name); err != nil {
                        klog.Errorf("failed to reconcile vpc %q bfd static route", vpc.Name)
                        return err
                }
        }

        if subnet.Spec.Vlan == "" || subnet.Spec.LogicalGateway || subnet.Spec.U2OInterconnection {
                if err = c.addCustomVPCStaticRouteForSubnet(subnet); err != nil {
                        klog.Errorf("failed to add static route for underlay to overlay subnet interconnection %s %v", subnet.Name, err)
                        return err
                }
                if err = c.addCommonRoutesForSubnet(subnet); err != nil {
                        klog.Error(err)
                        return err
                }
        }

        if subnet.Spec.Vlan != "" && !subnet.Spec.LogicalGateway && subnet.Spec.U2OInterconnection && subnet.Status.U2OInterconnectionIP != "" {
                if err := c.addPolicyRouteForU2OInterconn(subnet); err != nil {
                        klog.Errorf("failed to add policy route for underlay to overlay subnet interconnection %s %v", subnet.Name, err)
                        return err
                }
        }

        return nil
}

func (c *Controller) deleteStaticRoute(ip, router, routeTable string) error {
        for ipStr := range strings.SplitSeq(ip, ",") {
                if err := c.deleteStaticRouteFromVpc(
                        router,
                        routeTable,
                        ipStr,
                        "",
                        kubeovnv1.PolicyDst,
                ); err != nil {
                        klog.Errorf("failed to delete static route %s, %v", ipStr, err)
                        return err
                }
        }

        return nil
}

func (c *Controller) reconcileVlan(subnet *kubeovnv1.Subnet) error {
        if subnet.Spec.Vlan == "" {
                return nil
        }
        klog.Infof("reconcile vlan %v", subnet.Spec.Vlan)

        vlan, err := c.vlansLister.Get(subnet.Spec.Vlan)
        if err != nil {
                klog.Errorf("failed to get vlan %s: %v", subnet.Spec.Vlan, err)
                return err
        }
        if vlan.Status.Conflict {
                err = fmt.Errorf("subnet %s has invalid conflict vlan %s", subnet.Name, vlan.Name)
                klog.Error(err)
                return err
        }

        localnetPort := ovs.GetLocalnetName(subnet.Name)
        if err := c.OVNNbClient.CreateLocalnetLogicalSwitchPort(subnet.Name, localnetPort, vlan.Spec.Provider, subnet.Spec.CIDRBlock, vlan.Spec.ID); err != nil {
                klog.Errorf("create localnet port for subnet %s: %v", subnet.Name, err)
                return err
        }

        if !slices.Contains(vlan.Status.Subnets, subnet.Name) {
                newVlan := vlan.DeepCopy()
                newVlan.Status.Subnets = append(newVlan.Status.Subnets, subnet.Name)
                _, err = c.config.KubeOvnClient.KubeovnV1().Vlans().UpdateStatus(context.Background(), newVlan, metav1.UpdateOptions{})
                if err != nil {
                        klog.Errorf("failed to update status of vlan %s: %v", vlan.Name, err)
                        return err
                }
        }

        return nil
}

func (c *Controller) reconcileSubnetSpecialIPs(subnet *kubeovnv1.Subnet) (bool, bool, error) {
        isU2OIPChanged := false
        isMcastQuerierIPChanged := false
        var err error

        // reconcile u2o IP
        if subnet.Spec.Vlan != "" && !subnet.Spec.LogicalGateway {
                u2oInterconnName := fmt.Sprintf(util.U2OInterconnName, subnet.Spec.Vpc, subnet.Name)
                u2oInterconnLrpName := fmt.Sprintf("%s-%s", subnet.Spec.Vpc, subnet.Name)
                var v4ip, v6ip string
                if subnet.Spec.U2OInterconnection {
                        v4ip, v6ip, _, err = c.acquireU2OIP(subnet, u2oInterconnName, u2oInterconnLrpName)
                        if err != nil {
                                return isU2OIPChanged, isMcastQuerierIPChanged, err
                        }

                        if v4ip != "" || v6ip != "" {
                                isU2OIPChanged = true
                        }
                } else if subnet.Status.U2OInterconnectionIP != "" {
                        err = c.releaseU2OIP(subnet, u2oInterconnName)
                        if err != nil {
                                return isU2OIPChanged, isMcastQuerierIPChanged, err
                        }
                        isU2OIPChanged = true
                }

                if isU2OIPChanged {
                        klog.Infof("reconcile underlay subnet %s to overlay interconnection with U2OInterconnection %v U2OInterconnectionIP %s",
                                subnet.Name, subnet.Spec.U2OInterconnection, subnet.Status.U2OInterconnectionIP)
                }
        }

        // reconcile mcast querier IP
        if subnet.Spec.EnableMulticastSnoop {
                isMcastQuerierIPChanged, err = c.acquireMcastQuerierIP(subnet)
                if err != nil {
                        return isU2OIPChanged, isMcastQuerierIPChanged, err
                }
        } else {
                isMcastQuerierIPChanged, err = c.releaseMcastQuerierIP(subnet)
                if err != nil {
                        return isU2OIPChanged, isMcastQuerierIPChanged, err
                }
        }

        // calculate subnet status
        if isU2OIPChanged || isMcastQuerierIPChanged {
                if _, err := c.calcSubnetStatusIP(subnet); err != nil {
                        klog.Error(err)
                        return isU2OIPChanged, isMcastQuerierIPChanged, err
                }
        }

        return isU2OIPChanged, isMcastQuerierIPChanged, nil
}

func (c *Controller) acquireU2OIP(subnet *kubeovnv1.Subnet, u2oInterconnName, u2oInterconnLrpName string) (string, string, string, error) {
        var v4ip, v6ip, mac string
        var err error
        if subnet.Spec.U2OInterconnectionIP == "" && (subnet.Status.U2OInterconnectionIP == "" || subnet.Status.U2OInterconnectionMAC == "") {
                v4ip, v6ip, mac, err = c.acquireIPAddress(subnet.Name, u2oInterconnName, u2oInterconnLrpName)
                if err != nil {
                        klog.Errorf("failed to acquire underlay to overlay interconnection ip address for subnet %s, %v", subnet.Name, err)
                        return "", "", "", err
                }
        } else if subnet.Spec.U2OInterconnectionIP != "" && subnet.Status.U2OInterconnectionIP != subnet.Spec.U2OInterconnectionIP {
                if subnet.Status.U2OInterconnectionIP != "" {
                        klog.Infof("release underlay to overlay interconnection ip address %s for subnet %s", subnet.Status.U2OInterconnectionIP, subnet.Name)
                        c.ipam.ReleaseAddressByPod(u2oInterconnName, subnet.Name)
                }
                v4ip, v6ip, mac, err = c.acquireStaticIPAddress(subnet.Name, u2oInterconnName, u2oInterconnLrpName, subnet.Spec.U2OInterconnectionIP, nil)
                if err != nil {
                        klog.Errorf("failed to acquire static underlay to overlay interconnection ip address for subnet %s, %v", subnet.Name, err)
                        return "", "", "", err
                }
        }
        if v4ip != "" || v6ip != "" {
                switch subnet.Spec.Protocol {
                case kubeovnv1.ProtocolIPv4:
                        subnet.Status.U2OInterconnectionIP = v4ip
                case kubeovnv1.ProtocolIPv6:
                        subnet.Status.U2OInterconnectionIP = v6ip
                case kubeovnv1.ProtocolDual:
                        subnet.Status.U2OInterconnectionIP = fmt.Sprintf("%s,%s", v4ip, v6ip)
                }
                err = c.createOrUpdateIPCR("", u2oInterconnName, subnet.Status.U2OInterconnectionIP, mac, subnet.Name, "default", "", "")
                if err != nil {
                        klog.Errorf("failed to create or update IPs of %s : %v", u2oInterconnLrpName, err)
                        return "", "", "", err
                }
                subnet.Status.U2OInterconnectionMAC = mac
        }
        return v4ip, v6ip, mac, nil
}

func (c *Controller) releaseU2OIP(subnet *kubeovnv1.Subnet, u2oInterconnName string) error {
        klog.Infof("release underlay to overlay interconnection ip address %s for subnet %s", subnet.Status.U2OInterconnectionIP, subnet.Name)
        c.ipam.ReleaseAddressByPod(u2oInterconnName, subnet.Name)
        subnet.Status.U2OInterconnectionIP = ""
        subnet.Status.U2OInterconnectionMAC = ""
        subnet.Status.U2OInterconnectionVPC = ""

        err := c.config.KubeOvnClient.KubeovnV1().IPs().Delete(context.Background(), u2oInterconnName, metav1.DeleteOptions{})
        if err != nil && !k8serrors.IsNotFound(err) {
                klog.Errorf("failed to delete ip %s, %v", u2oInterconnName, err)
                return err
        }

        return nil
}

func (c *Controller) acquireMcastQuerierIP(subnet *kubeovnv1.Subnet) (bool, error) {
        isMcastQuerierChanged := false
        mcastQuerierLspName := fmt.Sprintf(util.McastQuerierName, subnet.Name)
        var v4ip, v6ip, mac string
        var err error

        if subnet.Status.McastQuerierIP == "" || subnet.Status.McastQuerierMAC == "" {
                v4ip, v6ip, mac, err = c.acquireIPAddress(subnet.Name, mcastQuerierLspName, mcastQuerierLspName)
                if err != nil {
                        klog.Errorf("failed to acquire mcast querier ip address for subnet %s, %v", subnet.Name, err)
                        return isMcastQuerierChanged, err
                }
        }

        if v4ip != "" || v6ip != "" {
                switch subnet.Spec.Protocol {
                case kubeovnv1.ProtocolIPv4:
                        subnet.Status.McastQuerierIP = v4ip
                case kubeovnv1.ProtocolIPv6:
                        subnet.Status.McastQuerierIP = v6ip
                case kubeovnv1.ProtocolDual:
                        subnet.Status.McastQuerierIP = fmt.Sprintf("%s,%s", v4ip, v6ip)
                }

                err := c.createOrUpdateIPCR("", mcastQuerierLspName, subnet.Status.McastQuerierIP, mac, subnet.Name, "default", "", "")
                if err != nil {
                        klog.Errorf("failed to create or update IPs of %s : %v", mcastQuerierLspName, err)
                        return isMcastQuerierChanged, err
                }

                subnet.Status.McastQuerierMAC = mac
                klog.Infof("reconcile subnet %s mcast querier IP %s mac %s",
                        subnet.Name, subnet.Status.McastQuerierIP, subnet.Status.McastQuerierMAC)
                isMcastQuerierChanged = true
        }

        return isMcastQuerierChanged, nil
}

func (c *Controller) releaseMcastQuerierIP(subnet *kubeovnv1.Subnet) (bool, error) {
        isMcastQuerierChanged := false
        if subnet.Status.McastQuerierIP != "" {
                mcastQuerierLspName := fmt.Sprintf(util.McastQuerierName, subnet.Name)
                klog.Infof("release mcast querier ip address %s for subnet %s", subnet.Status.McastQuerierIP, subnet.Name)
                c.ipam.ReleaseAddressByPod(mcastQuerierLspName, subnet.Name)
                subnet.Status.McastQuerierIP = ""
                subnet.Status.McastQuerierMAC = ""

                if err := c.config.KubeOvnClient.KubeovnV1().IPs().Delete(context.Background(), mcastQuerierLspName, metav1.DeleteOptions{}); err != nil {
                        if !k8serrors.IsNotFound(err) {
                                klog.Errorf("failed to delete ip %s, %v", mcastQuerierLspName, err)
                                return isMcastQuerierChanged, err
                        }
                }
                isMcastQuerierChanged = true
                klog.Infof("reconcile subnet %s mcast querier IP %s mac %s",
                        subnet.Name, subnet.Status.McastQuerierIP, subnet.Status.McastQuerierMAC)
        }
        return isMcastQuerierChanged, nil
}

func isOvnSubnet(subnet *kubeovnv1.Subnet) bool {
        return util.IsOvnProvider(subnet.Spec.Provider)
}

func formatExcludeIPRanges(subnet *kubeovnv1.Subnet) {
        var excludeIPs []string
        mapIPs := make(map[string]*ipam.IPRange, len(subnet.Spec.ExcludeIps))
        for _, excludeIP := range subnet.Spec.ExcludeIps {
                if _, ok := mapIPs[excludeIP]; !ok {
                        ips := strings.Split(excludeIP, "..")
                        start, _ := ipam.NewIP(ips[0])
                        end := start
                        if len(ips) != 1 {
                                end, _ = ipam.NewIP(ips[1])
                        }
                        mapIPs[excludeIP] = ipam.NewIPRange(start, end)
                }
        }
        newMap := filterRepeatIPRange(mapIPs)
        for _, v := range newMap {
                if v.Start().Equal(v.End()) {
                        excludeIPs = append(excludeIPs, v.Start().String())
                } else {
                        excludeIPs = append(excludeIPs, v.Start().String()+".."+v.End().String())
                }
        }
        sort.Strings(excludeIPs)
        if !slices.Equal(subnet.Spec.ExcludeIps, excludeIPs) {
                klog.V(3).Infof("excludeips before format is %v, after format is %v", subnet.Spec.ExcludeIps, excludeIPs)
                subnet.Spec.ExcludeIps = excludeIPs
        }
}

func filterRepeatIPRange(mapIPs map[string]*ipam.IPRange) map[string]*ipam.IPRange {
        for ka, a := range mapIPs {
                for kb, b := range mapIPs {
                        if ka == kb && a == b {
                                continue
                        }

                        if b.End().LessThan(a.Start()) || b.Start().GreaterThan(a.End()) {
                                continue
                        }

                        if (a.Start().Equal(b.Start()) || a.Start().GreaterThan(b.Start())) &&
                                (a.End().Equal(b.End()) || a.End().LessThan(b.End())) {
                                delete(mapIPs, ka)
                                continue
                        }

                        if (a.Start().Equal(b.Start()) || a.Start().GreaterThan(b.Start())) &&
                                a.End().GreaterThan(b.End()) {
                                delete(mapIPs, ka)
                                mapIPs[kb] = ipam.NewIPRange(b.Start(), a.End())
                                continue
                        }

                        if (a.End().Equal(b.End()) || a.End().LessThan(b.End())) &&
                                a.Start().LessThan(b.Start()) {
                                delete(mapIPs, ka)
                                mapIPs[kb] = ipam.NewIPRange(a.Start(), b.End())
                                continue
                        }

                        // a contains b
                        mapIPs[kb] = a
                        delete(mapIPs, ka)
                }
        }
        return mapIPs
}

func (c *Controller) checkGwNodeExists(gatewayNode string) bool {
        found := false
        for gwName := range strings.SplitSeq(gatewayNode, ",") {
                // the format of gatewayNode can be like 'kube-ovn-worker:172.18.0.2, kube-ovn-control-plane:172.18.0.3', which consists of node name and designative egress ip
                if strings.Contains(gwName, ":") {
                        gwName = strings.TrimSpace(strings.Split(gwName, ":")[0])
                } else {
                        gwName = strings.TrimSpace(gwName)
                }

                gwNode, err := c.nodesLister.Get(gwName)
                if err != nil {
                        if k8serrors.IsNotFound(err) {
                                klog.Errorf("gw node %s does not exist, %v", gwName, err)
                                continue
                        }
                }
                if gwNode != nil {
                        found = true
                        break
                }
        }
        return found
}

func (c *Controller) getGatewayNodes(subnet *kubeovnv1.Subnet) ([]string, error) {
        if subnet.Spec.GatewayNode != "" {
                var nodes []string
                for gw := range strings.SplitSeq(subnet.Spec.GatewayNode, ",") {
                        if strings.Contains(gw, ":") {
                                gw = strings.TrimSpace(strings.Split(gw, ":")[0])
                        } else {
                                gw = strings.TrimSpace(gw)
                        }
                        if gw != "" {
                                nodes = append(nodes, gw)
                        }
                }
                return nodes, nil
        }

        if len(subnet.Spec.GatewayNodeSelectors) > 0 {
                return c.getNodesBySelectors(subnet.Spec.GatewayNodeSelectors)
        }

        return nil, nil
}

func (c *Controller) getNodesBySelectors(selectors []metav1.LabelSelector) ([]string, error) {
        nodeSet := make(map[string]struct{})
        for _, selector := range selectors {
                labelSelector, err := metav1.LabelSelectorAsSelector(&selector)
                if err != nil {
                        klog.Errorf("failed to convert label selector: %v", err)
                        continue
                }
                nodes, err := c.nodesLister.List(labelSelector)
                if err != nil {
                        return nil, fmt.Errorf("failed to list nodes with selector %s: %w", labelSelector.String(), err)
                }
                for _, node := range nodes {
                        nodeSet[node.Name] = struct{}{}
                }
        }

        matchedNodes := make([]string, 0, len(nodeSet))
        for name := range nodeSet {
                matchedNodes = append(matchedNodes, name)
        }
        return matchedNodes, nil
}

func (c *Controller) checkSubnetGwNodesExist(subnet *kubeovnv1.Subnet) bool {
        if subnet.Spec.GatewayNode != "" {
                return c.checkGwNodeExists(subnet.Spec.GatewayNode)
        }

        if len(subnet.Spec.GatewayNodeSelectors) > 0 {
                nodes, err := c.getNodesBySelectors(subnet.Spec.GatewayNodeSelectors)
                if err != nil {
                        klog.Errorf("failed to get nodes by selectors: %v", err)
                        return false
                }
                return len(nodes) > 0
        }

        return false
}

func getIPSuffix(protocol string) string {
        if protocol == kubeovnv1.ProtocolIPv6 {
                return "ip6"
        }
        return "ip4"
}

func buildPolicyRouteExternalIDs(subnetName string, extraIDs map[string]string) map[string]string {
        externalIDs := map[string]string{
                "vendor": util.CniTypeName,
                "subnet": subnetName,
        }
        maps.Copy(externalIDs, extraIDs)
        return externalIDs
}

func (c *Controller) logicalRouterExists(vpcName string) bool {
        lr, err := c.OVNNbClient.GetLogicalRouter(vpcName, true)
        if err == nil && lr == nil {
                klog.Infof("logical router %s already deleted", vpcName)
                return false
        }
        return true
}

func (c *Controller) addCommonRoutesForSubnet(subnet *kubeovnv1.Subnet) error {
        for cidr := range strings.SplitSeq(subnet.Spec.CIDRBlock, ",") {
                if cidr == "" {
                        continue
                }

                var gateway string
                protocol := util.CheckProtocol(cidr)
                for gw := range strings.SplitSeq(subnet.Spec.Gateway, ",") {
                        if util.CheckProtocol(gw) == protocol {
                                gateway = gw
                                break
                        }
                }
                if gateway == "" {
                        return fmt.Errorf("failed to get gateway of CIDR %s", cidr)
                }

                ipSuffix := getIPSuffix(protocol)
                match := fmt.Sprintf("%s.dst == %s", ipSuffix, cidr)
                action := kubeovnv1.PolicyRouteActionAllow
                externalIDs := buildPolicyRouteExternalIDs(subnet.Name, nil)

                klog.Infof("add common policy route for router: %s, match %s, action %s, externalID %v", subnet.Spec.Vpc, match, action, externalIDs)
                if err := c.addPolicyRouteToVpc(
                        subnet.Spec.Vpc,
                        &kubeovnv1.PolicyRoute{
                                Priority: util.SubnetRouterPolicyPriority,
                                Match:    match,
                                Action:   action,
                        },
                        externalIDs,
                ); err != nil {
                        klog.Errorf("failed to add logical router policy for CIDR %s of subnet %s: %v", cidr, subnet.Name, err)
                        return err
                }
        }
        return nil
}

func getOverlaySubnetsPortGroupName(subnetName, nodeName string) string {
        return strings.ReplaceAll(fmt.Sprintf("%s.%s", subnetName, nodeName), "-", ".")
}

func (c *Controller) createPortGroupForDistributedSubnet(node *v1.Node, subnet *kubeovnv1.Subnet) error {
        if subnet.Spec.Vlan != "" && !subnet.Spec.LogicalGateway {
                return nil
        }
        if subnet.Spec.Vpc != c.config.ClusterRouter || subnet.Name == c.config.NodeSwitch {
                return nil
        }

        pgName := getOverlaySubnetsPortGroupName(subnet.Name, node.Name)
        externalIDs := map[string]string{
                "subnet":         subnet.Name,
                "node":           node.Name,
                "vendor":         util.CniTypeName,
                networkPolicyKey: subnet.Name + "/" + node.Name,
        }
        if err := c.OVNNbClient.CreatePortGroup(pgName, externalIDs); err != nil {
                klog.Errorf("create port group for subnet %s and node %s: %v", subnet.Name, node.Name, err)
                return err
        }

        return nil
}

func (c *Controller) updatePolicyRouteForCentralizedSubnet(subnetName, cidr string, nextHops []string, nameIPMap map[string]string) error {
        ipSuffix := getIPSuffix(util.CheckProtocol(cidr))
        match := fmt.Sprintf("%s.src == %s", ipSuffix, cidr)
        action := kubeovnv1.PolicyRouteActionReroute
        externalIDs := buildPolicyRouteExternalIDs(subnetName, nameIPMap)

        klog.Infof("add policy route for router: %s, match %s, action %s, nexthops %v, externalID %s", c.config.ClusterRouter, match, action, nextHops, externalIDs)
        if err := c.addPolicyRouteToVpc(
                c.config.ClusterRouter,
                &kubeovnv1.PolicyRoute{
                        Priority:  util.GatewayRouterPolicyPriority,
                        Match:     match,
                        Action:    action,
                        NextHopIP: strings.Join(nextHops, ","),
                },
                externalIDs,
        ); err != nil {
                klog.Errorf("failed to add policy route for centralized subnet %s: %v", subnetName, err)
                return err
        }
        return nil
}

func (c *Controller) addPolicyRouteForCentralizedSubnet(subnet *kubeovnv1.Subnet, nodeName string, ipNameMap map[string]string, nodeIPs []string) error {
        for _, nodeIP := range nodeIPs {
                // node v4ip v6ip
                for cidrBlock := range strings.SplitSeq(subnet.Spec.CIDRBlock, ",") {
                        if util.CheckProtocol(cidrBlock) != util.CheckProtocol(nodeIP) {
                                continue
                        }
                        // Check for repeat policy route is processed in AddPolicyRoute

                        var nextHops []string
                        nameIPMap := map[string]string{}
                        nextHops = append(nextHops, nodeIP)
                        tmpName := nodeName
                        if nodeName == "" {
                                tmpName = ipNameMap[nodeIP]
                        }
                        nameIPMap[tmpName] = nodeIP
                        if err := c.updatePolicyRouteForCentralizedSubnet(subnet.Name, cidrBlock, nextHops, nameIPMap); err != nil {
                                klog.Error(err)
                                return err
                        }
                }
        }
        return nil
}

func (c *Controller) deletePolicyRouteForCentralizedSubnet(subnet *kubeovnv1.Subnet) error {
        for cidr := range strings.SplitSeq(subnet.Spec.CIDRBlock, ",") {
                ipSuffix := getIPSuffix(util.CheckProtocol(cidr))
                match := fmt.Sprintf("%s.src == %s", ipSuffix, cidr)
                klog.Infof("delete policy route for router: %s, priority: %d, match %s", c.config.ClusterRouter, util.GatewayRouterPolicyPriority, match)
                if err := c.deletePolicyRouteFromVpc(c.config.ClusterRouter, util.GatewayRouterPolicyPriority, match); err != nil {
                        klog.Errorf("failed to delete policy route for centralized subnet %s: %v", subnet.Name, err)
                        return err
                }
        }
        return nil
}

func (c *Controller) addPolicyRouteForDistributedSubnet(subnet *kubeovnv1.Subnet, nodeName, nodeIPv4, nodeIPv6 string) error {
        if subnet.Spec.Vlan != "" && !subnet.Spec.LogicalGateway {
                return nil
        }
        if subnet.Spec.Vpc != c.config.ClusterRouter || subnet.Name == c.config.NodeSwitch {
                return nil
        }

        pgName := getOverlaySubnetsPortGroupName(subnet.Name, nodeName)
        for cidrBlock := range strings.SplitSeq(subnet.Spec.CIDRBlock, ",") {
                ipSuffix := getIPSuffix(util.CheckProtocol(cidrBlock))
                nodeIP := nodeIPv4
                if ipSuffix == "ip6" {
                        nodeIP = nodeIPv6
                }
                if nodeIP == "" {
                        continue
                }

                pgAs := fmt.Sprintf("%s_%s", pgName, ipSuffix)
                match := fmt.Sprintf("%s.src == $%s", ipSuffix, pgAs)
                action := kubeovnv1.PolicyRouteActionReroute
                externalIDs := buildPolicyRouteExternalIDs(subnet.Name, map[string]string{"node": nodeName})

                klog.Infof("add policy route for router: %s, match %s, action %s, externalID %v", c.config.ClusterRouter, match, action, externalIDs)
                if err := c.addPolicyRouteToVpc(
                        c.config.ClusterRouter,
                        &kubeovnv1.PolicyRoute{
                                Priority:  util.GatewayRouterPolicyPriority,
                                Match:     match,
                                Action:    action,
                                NextHopIP: nodeIP,
                        },
                        externalIDs,
                ); err != nil {
                        klog.Errorf("failed to add logical router policy for port-group address-set %s: %v", pgAs, err)
                        return err
                }
        }
        return nil
}

func (c *Controller) deletePolicyRouteForDistributedSubnet(subnet *kubeovnv1.Subnet, nodeName string) error {
        pgName := getOverlaySubnetsPortGroupName(subnet.Name, nodeName)
        for cidrBlock := range strings.SplitSeq(subnet.Spec.CIDRBlock, ",") {
                ipSuffix := getIPSuffix(util.CheckProtocol(cidrBlock))
                pgAs := fmt.Sprintf("%s_%s", pgName, ipSuffix)
                match := fmt.Sprintf("%s.src == $%s", ipSuffix, pgAs)
                klog.Infof("delete policy route for router: %s, priority: %d, match: %q", c.config.ClusterRouter, util.GatewayRouterPolicyPriority, match)
                if err := c.deletePolicyRouteFromVpc(c.config.ClusterRouter, util.GatewayRouterPolicyPriority, match); err != nil {
                        klog.Errorf("failed to delete policy route for subnet %s: %v", subnet.Name, err)
                        return err
                }
        }
        return nil
}

func (c *Controller) deletePolicyRouteByGatewayType(subnet *kubeovnv1.Subnet, gatewayType string, isDelete bool) error {
        if (subnet.Spec.Vlan != "" && !subnet.Spec.LogicalGateway) || subnet.Spec.Vpc != c.config.ClusterRouter {
                return nil
        }

        for cidr := range strings.SplitSeq(subnet.Spec.CIDRBlock, ",") {
                if cidr == "" || !isDelete {
                        continue
                }

                ipSuffix := getIPSuffix(util.CheckProtocol(cidr))
                match := fmt.Sprintf("%s.dst == %s", ipSuffix, cidr)
                klog.Infof("delete policy route for router: %s, priority: %d, match %s", c.config.ClusterRouter, util.SubnetRouterPolicyPriority, match)
                if err := c.deletePolicyRouteFromVpc(c.config.ClusterRouter, util.SubnetRouterPolicyPriority, match); err != nil {
                        klog.Errorf("failed to delete logical router policy for CIDR %s of subnet %s: %v", cidr, subnet.Name, err)
                        return err
                }
        }
        if subnet.Name == c.config.NodeSwitch {
                return nil
        }

        if gatewayType == kubeovnv1.GWDistributedType {
                nodes, err := c.nodesLister.List(labels.Everything())
                if err != nil {
                        klog.Errorf("list nodes: %v", err)
                        return err
                }
                for _, node := range nodes {
                        pgName := getOverlaySubnetsPortGroupName(subnet.Name, node.Name)
                        if err = c.OVNNbClient.DeletePortGroup(pgName); err != nil {
                                klog.Errorf("delete port group for subnet %s and node %s: %v", subnet.Name, node.Name, err)
                                return err
                        }

                        if err = c.deletePolicyRouteForDistributedSubnet(subnet, node.Name); err != nil {
                                klog.Errorf("delete policy route for subnet %s and node %s: %v", subnet.Name, node.Name, err)
                                return err
                        }
                }
        }

        if gatewayType == kubeovnv1.GWCentralizedType {
                klog.Infof("delete policy route for centralized subnet %s", subnet.Name)
                if err := c.deletePolicyRouteForCentralizedSubnet(subnet); err != nil {
                        klog.Errorf("delete policy route for subnet %s: %v", subnet.Name, err)
                        return err
                }
        }

        return nil
}

func (c *Controller) addPolicyRouteForU2OInterconn(subnet *kubeovnv1.Subnet) error {
        v4Gw, v6Gw := util.SplitStringIP(subnet.Spec.Gateway)

        externalIDs := buildPolicyRouteExternalIDs(subnet.Name, map[string]string{"isU2ORoutePolicy": "true"})

        nodes, err := c.nodesLister.List(labels.Everything())
        if err != nil {
                klog.Errorf("failed to list nodes: %v", err)
                return err
        }

        var nodesIPv4, nodesIPv6 []string
        for _, node := range nodes {
                nodeIPv4, nodeIPv6 := util.GetNodeInternalIP(*node)

                if nodeIPv4 != "" {
                        nodesIPv4 = append(nodesIPv4, nodeIPv4)
                }
                if nodeIPv6 != "" {
                        nodesIPv6 = append(nodesIPv6, nodeIPv6)
                }
        }

        u2oExcludeIP4Ag := strings.ReplaceAll(fmt.Sprintf(util.U2OExcludeIPAg, subnet.Name, "ip4"), "-", ".")
        u2oExcludeIP6Ag := strings.ReplaceAll(fmt.Sprintf(util.U2OExcludeIPAg, subnet.Name, "ip6"), "-", ".")

        if err := c.OVNNbClient.CreateAddressSet(u2oExcludeIP4Ag, externalIDs); err != nil {
                klog.Errorf("create address set %s: %v", u2oExcludeIP4Ag, err)
                return err
        }

        if err := c.OVNNbClient.CreateAddressSet(u2oExcludeIP6Ag, externalIDs); err != nil {
                klog.Errorf("create address set %s: %v", u2oExcludeIP6Ag, err)
                return err
        }

        if len(nodesIPv4) > 0 {
                if err := c.OVNNbClient.AddressSetUpdateAddress(u2oExcludeIP4Ag, nodesIPv4...); err != nil {
                        klog.Errorf("set v4 address set %s with address %v: %v", u2oExcludeIP4Ag, nodesIPv4, err)
                        return err
                }
        }

        if len(nodesIPv6) > 0 {
                if err := c.OVNNbClient.AddressSetUpdateAddress(u2oExcludeIP6Ag, nodesIPv6...); err != nil {
                        klog.Errorf("set v6 address set %s with address %v: %v", u2oExcludeIP6Ag, nodesIPv6, err)
                        return err
                }
        }

        for cidrBlock := range strings.SplitSeq(subnet.Spec.CIDRBlock, ",") {
                ipSuffix := getIPSuffix(util.CheckProtocol(cidrBlock))
                nextHop := v4Gw
                U2OexcludeIPAs := u2oExcludeIP4Ag
                if ipSuffix == "ip6" {
                        nextHop = v6Gw
                        U2OexcludeIPAs = u2oExcludeIP6Ag
                }

                match1 := fmt.Sprintf("%s.dst == %s", ipSuffix, cidrBlock)
                match2 := fmt.Sprintf("%s.dst == $%s && %s.src == %s", ipSuffix, U2OexcludeIPAs, ipSuffix, cidrBlock)
                match3 := fmt.Sprintf("%s.src == %s", ipSuffix, cidrBlock)

                /*
                        policy1:
                        priority 29400 match: "ip4.dst == underlay subnet cidr"                         action: allow

                        policy2:
                        priority 31000 match: "ip4.dst == node ips && ip4.src == underlay subnet cidr"  action: reroute physical gw

                        policy3:
                        priority 29000 match: "ip4.src == underlay subnet cidr"                         action: reroute physical gw

                        comment:
                        policy1 and policy2 allow overlay pod access underlay but when overlay pod access node ip, it should go join subnet,
                        policy3: underlay pod first access u2o interconnection lrp and then reroute to physical gw
                */
                action := kubeovnv1.PolicyRouteActionAllow
                if subnet.Spec.Vpc == c.config.ClusterRouter {
                        klog.Infof("add u2o interconnection policy for router: %s, match %s, action %s", subnet.Spec.Vpc, match1, action)
                        if err := c.addPolicyRouteToVpc(
                                subnet.Spec.Vpc,
                                &kubeovnv1.PolicyRoute{
                                        Priority: util.U2OSubnetPolicyPriority,
                                        Match:    match1,
                                        Action:   action,
                                },
                                externalIDs,
                        ); err != nil {
                                klog.Errorf("failed to add u2o interconnection policy1 for subnet %s %v", subnet.Name, err)
                                return err
                        }

                        action = kubeovnv1.PolicyRouteActionReroute
                        klog.Infof("add u2o interconnection policy for router: %s, match %s, action %s", subnet.Spec.Vpc, match2, action)
                        if err := c.addPolicyRouteToVpc(
                                subnet.Spec.Vpc,
                                &kubeovnv1.PolicyRoute{
                                        Priority:  util.SubnetRouterPolicyPriority,
                                        Match:     match2,
                                        Action:    action,
                                        NextHopIP: nextHop,
                                },
                                externalIDs,
                        ); err != nil {
                                klog.Errorf("failed to add u2o interconnection policy2 for subnet %s %v", subnet.Name, err)
                                return err
                        }
                }

                action = kubeovnv1.PolicyRouteActionReroute
                klog.Infof("add u2o interconnection policy for router: %s, match %s, action %s, nexthop %s", subnet.Spec.Vpc, match3, action, nextHop)
                if err := c.addPolicyRouteToVpc(
                        subnet.Spec.Vpc,
                        &kubeovnv1.PolicyRoute{
                                Priority:  util.GatewayRouterPolicyPriority,
                                Match:     match3,
                                Action:    action,
                                NextHopIP: nextHop,
                        },
                        externalIDs,
                ); err != nil {
                        klog.Errorf("failed to add u2o interconnection policy3 for subnet %s %v", subnet.Name, err)
                        return err
                }
        }
        return nil
}

func (c *Controller) deletePolicyRouteForU2OInterconn(subnet *kubeovnv1.Subnet) error {
        if !c.logicalRouterExists(subnet.Spec.Vpc) {
                return nil
        }
        policies, err := c.OVNNbClient.ListLogicalRouterPolicies(subnet.Spec.Vpc, -1, map[string]string{
                "isU2ORoutePolicy": "true",
                "vendor":           util.CniTypeName,
                "subnet":           subnet.Name,
        }, true)
        if err != nil {
                klog.Errorf("failed to list logical router policies: %v", err)
                return err
        }
        if len(policies) == 0 {
                return nil
        }

        lr := subnet.Status.U2OInterconnectionVPC
        if lr == "" {
                // old version field U2OInterconnectionVPC may be "" and then use subnet.Spec.Vpc
                lr = subnet.Spec.Vpc
        }

        for _, policy := range policies {
                klog.Infof("delete u2o interconnection policy for router %s with match %s priority %d", lr, policy.Match, policy.Priority)
                if err = c.OVNNbClient.DeleteLogicalRouterPolicyByUUID(lr, policy.UUID); err != nil {
                        klog.Errorf("failed to delete u2o interconnection policy for subnet %s: %v", subnet.Name, err)
                        return err
                }
        }

        u2oExcludeIP4Ag := strings.ReplaceAll(fmt.Sprintf(util.U2OExcludeIPAg, subnet.Name, "ip4"), "-", ".")
        u2oExcludeIP6Ag := strings.ReplaceAll(fmt.Sprintf(util.U2OExcludeIPAg, subnet.Name, "ip6"), "-", ".")

        if err := c.OVNNbClient.DeleteAddressSet(u2oExcludeIP4Ag); err != nil {
                klog.Errorf("delete address set %s: %v", u2oExcludeIP4Ag, err)
                return err
        }

        if err := c.OVNNbClient.DeleteAddressSet(u2oExcludeIP6Ag); err != nil {
                klog.Errorf("delete address set %s: %v", u2oExcludeIP6Ag, err)
                return err
        }

        return nil
}

func (c *Controller) addCustomVPCStaticRouteForSubnet(subnet *kubeovnv1.Subnet) error {
        if subnet.Spec.Vpc == "" {
                return nil
        }

        v4Gw, v6Gw := util.SplitStringIP(subnet.Spec.Gateway)
        v4Cidr, v6Cidr := util.SplitStringIP(subnet.Spec.CIDRBlock)

        if v4Gw != "" && v4Cidr != "" {
                if err := c.addStaticRouteToVpc(
                        subnet.Spec.Vpc,
                        &kubeovnv1.StaticRoute{
                                Policy:    kubeovnv1.PolicySrc,
                                CIDR:      v4Cidr,
                                NextHopIP: v4Gw,
                        },
                ); err != nil {
                        klog.Errorf("failed to add static route, %v", err)
                        return err
                }
        }

        if v6Gw != "" && v6Cidr != "" {
                if err := c.addStaticRouteToVpc(
                        subnet.Spec.Vpc,
                        &kubeovnv1.StaticRoute{
                                Policy:    kubeovnv1.PolicySrc,
                                CIDR:      v6Cidr,
                                NextHopIP: v6Gw,
                        },
                ); err != nil {
                        klog.Errorf("failed to add static route, %v", err)
                        return err
                }
        }
        return nil
}

func (c *Controller) deleteStaticRouteForU2OInterconn(subnet *kubeovnv1.Subnet) error {
        if subnet.Spec.Vpc == "" {
                return nil
        }

        v4Gw, v6Gw := util.SplitStringIP(subnet.Spec.Gateway)
        v4Cidr, v6Cidr := util.SplitStringIP(subnet.Spec.CIDRBlock)
        if v4Gw != "" && v4Cidr != "" {
                if err := c.deleteStaticRouteFromVpc(
                        subnet.Spec.Vpc,
                        subnet.Spec.RouteTable,
                        v4Cidr,
                        v4Gw,
                        kubeovnv1.PolicySrc,
                ); err != nil {
                        klog.Errorf("failed to add static route, %v", err)
                        return err
                }
        }

        if v6Gw != "" && v6Cidr != "" {
                if err := c.deleteStaticRouteFromVpc(
                        subnet.Spec.Vpc,
                        subnet.Spec.RouteTable,
                        v6Cidr,
                        v6Gw,
                        kubeovnv1.PolicySrc,
                ); err != nil {
                        klog.Errorf("failed to delete static route, %v", err)
                        return err
                }
        }
        return nil
}

func (c *Controller) reconcileRouteTableForSubnet(subnet *kubeovnv1.Subnet) error {
        if subnet.Spec.Vlan != "" && !subnet.Spec.U2OInterconnection {
                return nil
        }

        routerPortName := ovs.LogicalRouterPortName(subnet.Spec.Vpc, subnet.Name)
        lrp, err := c.OVNNbClient.GetLogicalRouterPort(routerPortName, false)
        if err != nil {
                klog.Error(err)
                return err
        }

        rtb := lrp.Options["route_table"]

        // no need to update
        if rtb == subnet.Spec.RouteTable {
                return nil
        }

        klog.Infof("reconcile route table %q for subnet %s", subnet.Spec.RouteTable, subnet.Name)
        opt := map[string]string{"route_table": subnet.Spec.RouteTable}
        if err = c.OVNNbClient.UpdateLogicalRouterPortOptions(routerPortName, opt); err != nil {
                klog.Errorf("failed to set route table of logical router port %s to %s: %v", routerPortName, subnet.Spec.RouteTable, err)
                return err
        }

        return nil
}

func (c *Controller) deleteCustomVPCPolicyRoutesForSubnet(subnet *kubeovnv1.Subnet) error {
        if !c.logicalRouterExists(subnet.Spec.Vpc) {
                return nil
        }
        for cidr := range strings.SplitSeq(subnet.Spec.CIDRBlock, ",") {
                ipSuffix := getIPSuffix(util.CheckProtocol(cidr))
                match := fmt.Sprintf("%s.dst == %s", ipSuffix, cidr)
                klog.Infof("delete policy route for router: %s, priority: %d, match %s", subnet.Spec.Vpc, util.SubnetRouterPolicyPriority, match)
                if err := c.deletePolicyRouteFromVpc(subnet.Spec.Vpc, util.SubnetRouterPolicyPriority, match); err != nil {
                        klog.Errorf("failed to delete logical router policy for CIDR %s of subnet %s: %v", cidr, subnet.Name, err)
                        return err
                }
        }
        return nil
}

func (c *Controller) clearOldU2OResource(subnet *kubeovnv1.Subnet) error {
        if subnet.Status.U2OInterconnectionVPC != "" &&
                (!subnet.Spec.U2OInterconnection || (subnet.Spec.U2OInterconnection && subnet.Status.U2OInterconnectionVPC != subnet.Spec.Vpc)) {
                // remove old u2o lsp and lrp first
                lspName := fmt.Sprintf("%s-%s", subnet.Name, subnet.Status.U2OInterconnectionVPC)
                lrpName := fmt.Sprintf("%s-%s", subnet.Status.U2OInterconnectionVPC, subnet.Name)
                klog.Infof("clean subnet %s old u2o resource with lsp %s lrp %s", subnet.Name, lspName, lrpName)
                if err := c.OVNNbClient.DeleteLogicalSwitchPort(lspName); err != nil {
                        klog.Errorf("failed to delete u2o logical switch port %s: %v", lspName, err)
                        return err
                }

                if err := c.OVNNbClient.DeleteLogicalRouterPort(lrpName); err != nil {
                        klog.Errorf("failed to delete u2o logical router port %s: %v", lrpName, err)
                        return err
                }

                if err := c.deletePolicyRouteForU2OInterconn(subnet); err != nil {
                        klog.Errorf("failed to delete u2o policy route for u2o connection %s: %v", subnet.Name, err)
                        return err
                }

                if subnet.Status.U2OInterconnectionVPC != c.config.ClusterRouter {
                        if err := c.deleteStaticRouteForU2OInterconn(subnet); err != nil {
                                klog.Errorf("failed to delete u2o static route for u2o connection %s: %v", subnet.Name, err)
                                return err
                        }
                }
        }
        return nil
}

func (c *Controller) reconcilePolicyRouteForCidrChangedSubnet(subnet *kubeovnv1.Subnet, isCommonRoute bool) error {
        var match string
        var priority int

        if isCommonRoute {
                priority = util.SubnetRouterPolicyPriority
        } else {
                priority = util.GatewayRouterPolicyPriority
        }

        policies, err := c.OVNNbClient.ListLogicalRouterPolicies(subnet.Spec.Vpc, priority, map[string]string{
                "vendor": util.CniTypeName,
                "subnet": subnet.Name,
        }, true)
        if err != nil {
                klog.Errorf("failed to list logical router policies: %v", err)
                return err
        }
        if len(policies) == 0 {
                return nil
        }

        for _, policy := range policies {
                policyProtocol := kubeovnv1.ProtocolIPv4
                if strings.Contains(policy.Match, "ip6") {
                        policyProtocol = kubeovnv1.ProtocolIPv6
                }

                for cidr := range strings.SplitSeq(subnet.Spec.CIDRBlock, ",") {
                        if cidr == "" {
                                continue
                        }
                        if policyProtocol != util.CheckProtocol(cidr) {
                                continue
                        }

                        ipSuffix := getIPSuffix(util.CheckProtocol(cidr))

                        if isCommonRoute {
                                match = fmt.Sprintf("%s.dst == %s", ipSuffix, cidr)
                        } else {
                                if subnet.Spec.GatewayType == kubeovnv1.GWCentralizedType {
                                        match = fmt.Sprintf("%s.src == %s", ipSuffix, cidr)
                                } else {
                                        continue
                                }
                        }

                        if policy.Match != match {
                                klog.Infof("delete old policy route for subnet %s with match %s priority %d, new match %v", subnet.Name, policy.Match, policy.Priority, match)
                                if err = c.OVNNbClient.DeleteLogicalRouterPolicyByUUID(subnet.Spec.Vpc, policy.UUID); err != nil {
                                        klog.Errorf("failed to delete policy route for subnet %s: %v", subnet.Name, err)
                                        return err
                                }
                        }
                }
        }
        return nil
}

func (c *Controller) addPolicyRouteForU2ONoLoadBalancer(subnet *kubeovnv1.Subnet) error {
        nodes, err := c.nodesLister.List(labels.Everything())
        if err != nil {
                klog.Errorf("failed to list nodes: %v", err)
                return err
        }
        for _, node := range nodes {
                pgName := getOverlaySubnetsPortGroupName(subnet.Name, node.Name)
                if err := c.OVNNbClient.CreatePortGroup(pgName, map[string]string{logicalRouterKey: subnet.Spec.Vpc, logicalSwitchKey: subnet.Name, u2oKey: "true"}); err != nil {
                        klog.Errorf("failed to create u2o port group for subnet %s and node %s: %v", subnet.Name, node.Name, err)
                        return err
                }
                key := util.NodeLspName(node.Name)
                ip, err := c.ipsLister.Get(key)
                if err != nil {
                        if k8serrors.IsNotFound(err) {
                                return nil
                        }
                        klog.Error(err)
                        return err
                }
                v4Svc, v6Svc := util.SplitStringIP(c.config.ServiceClusterIPRange)
                for cidrBlock := range strings.SplitSeq(subnet.Spec.CIDRBlock, ",") {
                        ipSuffix := getIPSuffix(util.CheckProtocol(cidrBlock))
                        nodeIP := ip.Spec.V4IPAddress
                        svcCIDR := v4Svc
                        if ipSuffix == "ip6" {
                                nodeIP = ip.Spec.V6IPAddress
                                svcCIDR = v6Svc
                        }
                        if nodeIP == "" || svcCIDR == "" {
                                continue
                        }

                        pgAs := fmt.Sprintf("%s_%s", pgName, ipSuffix)
                        match := fmt.Sprintf("%s.src == $%s && %s.dst == %s", ipSuffix, pgAs, ipSuffix, svcCIDR)
                        action := kubeovnv1.PolicyRouteActionReroute
                        externalIDs := buildPolicyRouteExternalIDs(subnet.Name, map[string]string{
                                "isU2ORoutePolicy":     "true",
                                "isU2ONoLBRoutePolicy": "true",
                                "node":                 node.Name,
                        })

                        klog.Infof("add u2o interconnection policy without enabling loadbalancer for router: %s, match %s, action %s, nexthop %s", subnet.Spec.Vpc, match, action, nodeIP)
                        if err := c.addPolicyRouteToVpc(
                                c.config.ClusterRouter,
                                &kubeovnv1.PolicyRoute{
                                        Priority:  util.U2OSubnetPolicyPriority,
                                        Match:     match,
                                        Action:    action,
                                        NextHopIP: nodeIP,
                                },
                                externalIDs,
                        ); err != nil {
                                klog.Errorf("failed to add logical router policy for port-group address-set %s: %v", pgAs, err)
                                return err
                        }
                }
        }
        lsps, err := c.OVNNbClient.ListNormalLogicalSwitchPorts(true, map[string]string{logicalSwitchKey: subnet.Name})
        if err != nil {
                klog.Errorf("failed to list normal lsps for subnet %s: %v", subnet.Name, err)
                return err
        }
        for _, lsp := range lsps {
                ip, err := c.ipsLister.Get(lsp.Name)
                if err != nil {
                        if k8serrors.IsNotFound(err) {
                                return nil
                        }
                        klog.Error(err)
                        return err
                }
                pgName := getOverlaySubnetsPortGroupName(subnet.Name, ip.Spec.NodeName)
                if err = c.OVNNbClient.PortGroupAddPorts(pgName, lsp.Name); err != nil {
                        klog.Errorf("failed to add port to u2o port group %s: %v", pgName, err)
                        return err
                }
        }
        return nil
}

func (c *Controller) deletePolicyRouteForU2ONoLoadBalancer(subnet *kubeovnv1.Subnet) error {
        if !c.logicalRouterExists(subnet.Spec.Vpc) {
                return nil
        }
        policies, err := c.OVNNbClient.ListLogicalRouterPolicies(subnet.Spec.Vpc, -1, map[string]string{
                "isU2ONoLBRoutePolicy": "true",
                "vendor":               util.CniTypeName,
                "subnet":               subnet.Name,
        }, true)
        if err != nil {
                klog.Errorf("failed to list logical router policies: %v", err)
                return err
        }

        lr := subnet.Status.U2OInterconnectionVPC
        if lr == "" {
                // old version field U2OInterconnectionVPC may be "" and then use subnet.Spec.Vpc
                lr = subnet.Spec.Vpc
        }

        for _, policy := range policies {
                klog.Infof("delete u2o interconnection policy without enabling loadbalancer for router %s with match %s priority %d", lr, policy.Match, policy.Priority)
                if err = c.OVNNbClient.DeleteLogicalRouterPolicyByUUID(lr, policy.UUID); err != nil {
                        klog.Errorf("failed to delete u2o interconnection policy for subnet %s: %v", subnet.Name, err)
                        return err
                }
        }

        pgs, err := c.OVNNbClient.ListPortGroups(map[string]string{logicalRouterKey: subnet.Spec.Vpc, logicalSwitchKey: subnet.Name, u2oKey: "true"})
        if err != nil {
                klog.Errorf("failed to list u2o port groups with u2oKey is true for subnet %s: %v", subnet.Name, err)
                return err
        }
        for _, pg := range pgs {
                klog.Infof("delete u2o port group %s for subnet %s", pg.Name, subnet.Name)
                if err = c.OVNNbClient.DeletePortGroup(pg.Name); err != nil {
                        klog.Errorf("failed to delete u2o port group for subnet %s: %v", subnet.Name, err)
                        return err
                }
        }
        return nil
}

func (c *Controller) findSubnetByNetworkAttachmentDefinition(ns, name string, subnets []*kubeovnv1.Subnet) (*kubeovnv1.Subnet, error) {
        nad, err := c.netAttachLister.NetworkAttachmentDefinitions(ns).Get(name)
        if err != nil {
                klog.Errorf("failed to get net-attach-def %s/%s: %v", ns, name, err)
                return nil, err
        }
        netCfg, err := loadNetConf([]byte(nad.Spec.Config))
        if err != nil {
                klog.Errorf("failed to parse config of net-attach-def %s/%s: %v", ns, name, err)
                return nil, err
        }

        var provider string
        if netCfg.Conf.Type == util.CniTypeName {
                provider = fmt.Sprintf("%s.%s.%s", name, ns, util.OvnProvider)
        } else {
                provider = fmt.Sprintf("%s.%s", name, ns)
        }
        var subnet *kubeovnv1.Subnet
        for _, s := range subnets {
                if s.Spec.Provider == provider {
                        subnet = s.DeepCopy()
                        break
                }
        }
        if subnet == nil {
                err = fmt.Errorf("failed to get subnet for net-attach-def %s/%s", ns, name)
                klog.Error(err)
                return nil, err
        }

        return subnet, nil
}

func (c *Controller) handleMcastQuerierChange(subnet *kubeovnv1.Subnet) error {
        if subnet.Spec.EnableMulticastSnoop {
                multicastSnoopFlag := map[string]string{
                        "mcast_snoop":   "true",
                        "mcast_querier": "true",
                        "mcast_ip4_src": subnet.Status.McastQuerierIP,
                        "mcast_eth_src": subnet.Status.McastQuerierMAC,
                }
                mcastQuerierLspName := fmt.Sprintf(util.McastQuerierName, subnet.Name)
                if err := c.OVNNbClient.CreateLogicalSwitchPort(subnet.Name, mcastQuerierLspName, subnet.Status.McastQuerierIP, subnet.Status.McastQuerierMAC, mcastQuerierLspName, "default", false, "", "", false, nil, ""); err != nil {
                        err = fmt.Errorf("failed to create mcast querier lsp %s: %w", mcastQuerierLspName, err)
                        klog.Error(err)
                        return err
                }

                if err := c.OVNNbClient.LogicalSwitchUpdateOtherConfig(subnet.Name, ovsdb.MutateOperationInsert, multicastSnoopFlag); err != nil {
                        klog.Errorf("enable logical switch multicast snoop %s: %v", subnet.Name, err)
                        return err
                }
        } else {
                lss, err := c.OVNNbClient.ListLogicalSwitch(false, func(ls *ovnnb.LogicalSwitch) bool {
                        return ls.Name == subnet.Name
                })
                if err != nil || len(lss) == 0 {
                        klog.Errorf("failed to list logical switch %s: %v", subnet.Name, err)
                        return err
                }

                multicastSnoopFlag := map[string]string{
                        "mcast_snoop":   lss[0].OtherConfig["mcast_snoop"],
                        "mcast_querier": lss[0].OtherConfig["mcast_querier"],
                        "mcast_ip4_src": lss[0].OtherConfig["mcast_ip4_src"],
                        "mcast_eth_src": lss[0].OtherConfig["mcast_eth_src"],
                }
                mcastQuerierLspName := fmt.Sprintf(util.McastQuerierName, subnet.Name)
                if err := c.OVNNbClient.LogicalSwitchUpdateOtherConfig(subnet.Name, ovsdb.MutateOperationDelete, multicastSnoopFlag); err != nil {
                        klog.Errorf("disable logical switch multicast snoop %s: %v", subnet.Name, err)
                        return err
                }

                if err := c.OVNNbClient.DeleteLogicalSwitchPort(mcastQuerierLspName); err != nil {
                        err = fmt.Errorf("failed to delete mcast querier lsp %s: %w", mcastQuerierLspName, err)
                        klog.Error(err)
                        return err
                }
        }
        return nil
}

kubeovn / kube-ovn / 20094102470

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