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Fix route deletion for Service ClusterIP and LoadBalancerIP (#4711)
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When proxyAll is enabled, AntreaProxy needs to install routes in the
host network namespace to redirect traffic to OVS for load balancing.
For a Service with multiple ports, multiple ServicePorts are generated
and processed. The previous code installed the route for a ClusterIP or
a LoadBalancerIP multiple times when such a Service was created, and
uninstalled the route multiple times when it was deleted, leading to a
few problems.

This patch adds a serviceIPRouteReferences which tracks the references
of Service IPs' routes. The key is the Service IP and the value is the
the set of ServiceInfo strings. With the references, we install a route
exactly once as long as it's used by any ServicePorts and uninstall it
exactly once when it's no longer used by any ServicePorts.

This patch also fixes an issue that the route for ClusterIP was not
removed on Windows Nodes after the Service was removed.

Fixes #4361

Signed-off-by: Quan Tian <[email protected]>
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@tnqn
tnqn authored Mar 17, 2023
1 parent 2ee4e3d commit d2c4ef8
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Showing 7 changed files with 289 additions and 138 deletions.
99 changes: 76 additions & 23 deletions pkg/agent/proxy/proxier.go
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@ import (
discovery "k8s.io/api/discovery/v1"
"k8s.io/apimachinery/pkg/runtime"
apimachinerytypes "k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/client-go/informers"
"k8s.io/client-go/tools/record"
"k8s.io/klog/v2"
Expand Down Expand Up @@ -104,6 +105,13 @@ type proxier struct {
serviceHealthServer healthcheck.ServiceHealthServer
numLocalEndpoints map[apimachinerytypes.NamespacedName]int

// serviceIPRouteReferences tracks the references of Service IP routes. The key is the Service IP and the value is
// the set of ServiceInfo strings. Because a Service could have multiple ports and each port will generate a
// ServicePort (which is the unit of the processing), a Service IP route may be required by several ServicePorts.
// With the references, we install a route exactly once as long as it's used by any ServicePorts and uninstall it
// exactly once when it's no longer used by any ServicePorts.
// It applies to ClusterIP and LoadBalancerIP.
serviceIPRouteReferences map[string]sets.String
// syncedOnce returns true if the proxier has synced rules at least once.
syncedOnce bool
syncedOnceMutex sync.RWMutex
Expand Down Expand Up @@ -157,16 +165,24 @@ func (p *proxier) removeStaleServices() {
}
delete(p.endpointsInstalledMap, svcPortName)
}
// Remove NodePort flows and configurations.
if p.proxyAll && svcInfo.NodePort() > 0 {
if err := p.uninstallNodePortService(uint16(svcInfo.NodePort()), svcInfo.OFProtocol); err != nil {
klog.ErrorS(err, "Error when uninstalling NodePort flows and configurations for Service", "ServicePortName", svcPortName, "ServiceInfo", svcInfoStr)
continue
// Remove NodePort and ClusterIP flows and configurations.
if p.proxyAll {
if svcInfo.NodePort() > 0 {
if err := p.uninstallNodePortService(uint16(svcInfo.NodePort()), svcInfo.OFProtocol); err != nil {
klog.ErrorS(err, "Error when uninstalling NodePort flows and configurations for Service", "ServicePortName", svcPortName, "ServiceInfo", svcInfoStr)
continue
}
}
if svcInfo.ClusterIP() != nil {
if err := p.deleteRouteForServiceIP(svcInfoStr, svcInfo.ClusterIP(), p.routeClient.DeleteClusterIPRoute); err != nil {
klog.ErrorS(err, "Failed to remove ClusterIP Service routes", "Service", svcPortName)
continue
}
}
}
// Remove LoadBalancer flows and configurations.
if p.proxyLoadBalancerIPs && len(svcInfo.LoadBalancerIPStrings()) > 0 {
if err := p.uninstallLoadBalancerService(svcInfo.LoadBalancerIPStrings(), uint16(svcInfo.Port()), svcInfo.OFProtocol); err != nil {
if err := p.uninstallLoadBalancerService(svcInfoStr, svcInfo.LoadBalancerIPStrings(), uint16(svcInfo.Port()), svcInfo.OFProtocol); err != nil {
klog.ErrorS(err, "Error when uninstalling LoadBalancer flows and configurations for Service", "ServicePortName", svcPortName, "ServiceInfo", svcInfoStr)
continue
}
Expand Down Expand Up @@ -313,37 +329,73 @@ func (p *proxier) uninstallNodePortService(svcPort uint16, protocol binding.Prot
return nil
}

func (p *proxier) installLoadBalancerService(groupID binding.GroupIDType, loadBalancerIPStrings []string, svcPort uint16, protocol binding.Protocol, affinityTimeout uint16, nodeLocalExternal bool) error {
func (p *proxier) installLoadBalancerService(svcInfoStr string, groupID binding.GroupIDType, loadBalancerIPStrings []string, svcPort uint16, protocol binding.Protocol, affinityTimeout uint16, nodeLocalExternal bool) error {
for _, ingress := range loadBalancerIPStrings {
if ingress != "" {
if err := p.ofClient.InstallServiceFlows(groupID, net.ParseIP(ingress), svcPort, protocol, affinityTimeout, nodeLocalExternal, corev1.ServiceTypeLoadBalancer, false); err != nil {
ip := net.ParseIP(ingress)
if err := p.ofClient.InstallServiceFlows(groupID, ip, svcPort, protocol, affinityTimeout, nodeLocalExternal, corev1.ServiceTypeLoadBalancer, false); err != nil {
return fmt.Errorf("failed to install LoadBalancer load balancing flows: %w", err)
}
if p.proxyAll {
if err := p.addRouteForServiceIP(svcInfoStr, ip, p.routeClient.AddLoadBalancer); err != nil {
return fmt.Errorf("failed to install LoadBalancer traffic redirecting routes: %w", err)
}
}
}
}
if p.proxyAll {
if err := p.routeClient.AddLoadBalancer(loadBalancerIPStrings); err != nil {
return fmt.Errorf("failed to install LoadBalancer traffic redirecting routes: %w", err)
return nil
}

func (p *proxier) addRouteForServiceIP(svcInfoStr string, ip net.IP, addRouteFn func(net.IP) error) error {
ipStr := ip.String()
references, exists := p.serviceIPRouteReferences[ipStr]
// If the IP was not referenced by any Service port, install a route for it.
// Otherwise, just reference it.
if !exists {
if err := addRouteFn(ip); err != nil {
return err
}
references = sets.NewString(svcInfoStr)
p.serviceIPRouteReferences[ipStr] = references
} else {
references.Insert(svcInfoStr)
}

return nil
}

func (p *proxier) uninstallLoadBalancerService(loadBalancerIPStrings []string, svcPort uint16, protocol binding.Protocol) error {
func (p *proxier) uninstallLoadBalancerService(svcInfoStr string, loadBalancerIPStrings []string, svcPort uint16, protocol binding.Protocol) error {
for _, ingress := range loadBalancerIPStrings {
if ingress != "" {
if err := p.ofClient.UninstallServiceFlows(net.ParseIP(ingress), svcPort, protocol); err != nil {
ip := net.ParseIP(ingress)
if err := p.ofClient.UninstallServiceFlows(ip, svcPort, protocol); err != nil {
return fmt.Errorf("failed to remove LoadBalancer load balancing flows: %w", err)
}
if p.proxyAll {
if err := p.deleteRouteForServiceIP(svcInfoStr, ip, p.routeClient.DeleteLoadBalancer); err != nil {
return fmt.Errorf("failed to remove LoadBalancer traffic redirecting routes: %w", err)
}
}
}
}
if p.proxyAll {
if err := p.routeClient.DeleteLoadBalancer(loadBalancerIPStrings); err != nil {
return fmt.Errorf("failed to remove LoadBalancer traffic redirecting routes: %w", err)
return nil
}

func (p *proxier) deleteRouteForServiceIP(svcInfoStr string, ip net.IP, deleteRouteFn func(net.IP) error) error {
ipStr := ip.String()
references, exists := p.serviceIPRouteReferences[ipStr]
// If the IP was not referenced by this Service port, skip it.
if exists && references.Has(svcInfoStr) {
// Delete the IP only if this Service port is the last one referencing it.
// Otherwise, just dereference it.
if references.Len() == 1 {
if err := deleteRouteFn(ip); err != nil {
return err
}
delete(p.serviceIPRouteReferences, ipStr)
} else {
references.Delete(svcInfoStr)
}
}

return nil
}

Expand Down Expand Up @@ -548,8 +600,8 @@ func (p *proxier) installServices() {
}
}
// If previous Service which has ClusterIP should be removed, remove ClusterIP routes.
if svcInfo.ClusterIP() != nil {
if err := p.routeClient.DeleteClusterIPRoute(pSvcInfo.ClusterIP()); err != nil {
if pSvcInfo.ClusterIP() != nil {
if err := p.deleteRouteForServiceIP(pSvcInfo.String(), pSvcInfo.ClusterIP(), p.routeClient.DeleteClusterIPRoute); err != nil {
klog.ErrorS(err, "Error when uninstalling ClusterIP route for Service", "ServicePortName", svcPortName, "ServiceInfo", svcInfoStr)
continue
}
Expand Down Expand Up @@ -580,7 +632,7 @@ func (p *proxier) installServices() {
// is created, the routing target IP block will be recalculated for expansion to be able to route the new
// created ClusterIP. Deleting a ClusterIP will not shrink the target routing IP block. The Service CIDR
// can be finally calculated after creating enough ClusterIPs.
if err := p.routeClient.AddClusterIPRoute(svcInfo.ClusterIP()); err != nil {
if err := p.addRouteForServiceIP(svcInfo.String(), svcInfo.ClusterIP(), p.routeClient.AddClusterIPRoute); err != nil {
klog.ErrorS(err, "Error when installing ClusterIP route for Service", "ServicePortName", svcPortName, "ServiceInfo", svcInfoStr)
continue
}
Expand Down Expand Up @@ -612,7 +664,7 @@ func (p *proxier) installServices() {
}
// Remove LoadBalancer flows and configurations.
if len(toDelete) > 0 {
if err := p.uninstallLoadBalancerService(toDelete, uint16(pSvcInfo.Port()), pSvcInfo.OFProtocol); err != nil {
if err := p.uninstallLoadBalancerService(pSvcInfo.String(), toDelete, uint16(pSvcInfo.Port()), pSvcInfo.OFProtocol); err != nil {
klog.ErrorS(err, "Error when uninstalling LoadBalancer flows and configurations for Service", "ServicePortName", svcPortName, "ServiceInfo", svcInfoStr)
continue
}
Expand All @@ -624,7 +676,7 @@ func (p *proxier) installServices() {
klog.ErrorS(nil, "Group for Service externalTrafficPolicy was not installed", "ServicePortName", svcPortName, "ServiceInfo", svcInfoStr, "externalTrafficPolicy", externalPolicyLocal)
continue
}
if err := p.installLoadBalancerService(groupID, toAdd, uint16(svcInfo.Port()), svcInfo.OFProtocol, uint16(affinityTimeout), svcInfo.ExternalPolicyLocal()); err != nil {
if err := p.installLoadBalancerService(svcInfo.String(), groupID, toAdd, uint16(svcInfo.Port()), svcInfo.OFProtocol, uint16(affinityTimeout), svcInfo.ExternalPolicyLocal()); err != nil {
klog.ErrorS(err, "Error when installing LoadBalancer flows and configurations for Service", "Service", "ServicePortName", svcPortName, "ServiceInfo", svcInfoStr)
continue
}
Expand Down Expand Up @@ -1002,6 +1054,7 @@ func NewProxier(
endpointsInstalledMap: types.EndpointsMap{},
endpointsMap: types.EndpointsMap{},
endpointReferenceCounter: map[string]int{},
serviceIPRouteReferences: map[string]sets.String{},
nodeLabels: map[string]string{},
serviceStringMap: map[string]k8sproxy.ServicePortName{},
groupCounter: groupCounter,
Expand Down
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