/
port_claim.go
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/
port_claim.go
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package node
import (
"fmt"
"net"
"reflect"
"sync"
"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/util"
kapi "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
apierrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/client-go/tools/record"
"k8s.io/klog/v2"
utilnet "k8s.io/utils/net"
)
// Constants for valid LocalHost descriptions:
const (
nodePortDescr = "nodePort for"
externalPortDescr = "externalIP for"
)
type handler func(desc string, ip string, port int32, protocol kapi.Protocol, svc *kapi.Service) error
type portManager interface {
open(desc string, ip string, port int32, protocol kapi.Protocol, svc *kapi.Service) error
close(desc string, ip string, port int32, protocol kapi.Protocol, svc *kapi.Service) error
}
type localPortManager struct {
recorder record.EventRecorder
activeSocketsLock sync.Mutex
localAddrSet map[string]net.IPNet
portsMap map[utilnet.LocalPort]utilnet.Closeable
portOpener utilnet.PortOpener
}
func (p *localPortManager) open(desc string, ip string, port int32, protocol kapi.Protocol, svc *kapi.Service) error {
klog.V(5).Infof("Opening socket for service: %s/%s, port: %v and protocol %s", svc.Namespace, svc.Name, port, protocol)
if ip != "" {
if _, exists := p.localAddrSet[ip]; !exists {
klog.V(5).Infof("The IP %s is not one of the node local ports", ip)
return nil
}
}
var localPort *utilnet.LocalPort
var portError error
switch protocol {
case kapi.ProtocolTCP, kapi.ProtocolUDP:
localPort, portError = utilnet.NewLocalPort(desc, ip, "", int(port), utilnet.Protocol(protocol))
case kapi.ProtocolSCTP:
// Do not open ports for SCTP, ref: https://github.com/kubernetes/enhancements/blob/master/keps/sig-network/0015-20180614-SCTP-support.md#the-solution-in-the-kubernetes-sctp-support-implementation
return nil
default:
portError = fmt.Errorf("unknown protocol %q", protocol)
}
if portError != nil {
p.emitPortClaimEvent(svc, port, portError)
return portError
}
klog.V(5).Infof("Opening socket for LocalPort %v", localPort)
p.activeSocketsLock.Lock()
defer p.activeSocketsLock.Unlock()
if _, exists := p.portsMap[*localPort]; exists {
// If the port already exists in the map, we've already opened it.
// Don't consider this as an error, since we've reached the desired state.
klog.Infof("Svc %s/%s: port %v is already open, no action needed", svc.Namespace, svc.Name, port)
return nil
} else {
closeable, err := p.portOpener.OpenLocalPort(localPort)
if err != nil {
p.emitPortClaimEvent(svc, port, err)
return err
}
p.portsMap[*localPort] = closeable
}
return nil
}
func (p *localPortManager) close(desc string, ip string, port int32, protocol kapi.Protocol, svc *kapi.Service) error {
klog.V(5).Infof("Closing socket claimed for service: %s/%s and port: %v", svc.Namespace, svc.Name, port)
if protocol != kapi.ProtocolTCP && protocol != kapi.ProtocolUDP {
return nil
}
if ip != "" {
if _, exists := p.localAddrSet[ip]; !exists {
klog.V(5).Infof("The IP %s is not one of the node local ports", ip)
return nil
}
}
localPort, err := utilnet.NewLocalPort(desc, ip, "", int(port), utilnet.Protocol(protocol))
if err != nil {
return fmt.Errorf("error localPort creation for svc: %s/%s on port: %v, err: %v", svc.Namespace, svc.Name, port, err)
}
klog.V(5).Infof("Closing socket for LocalPort %v", localPort)
p.activeSocketsLock.Lock()
defer p.activeSocketsLock.Unlock()
if _, exists := p.portsMap[*localPort]; exists {
if err = p.portsMap[*localPort].Close(); err != nil {
return fmt.Errorf("error closing socket for svc: %s/%s on port: %v, err: %v", svc.Namespace, svc.Name, port, err)
}
delete(p.portsMap, *localPort)
return nil
}
// If the port doesn't exist in the map, we've already closed it.
// Don't consider this as an error, since we've reached the desired state.
klog.Infof("Svc %s/%s: port %v is already closed, no action needed", svc.Namespace, svc.Name, port)
return nil
}
func (p *localPortManager) emitPortClaimEvent(svc *kapi.Service, port int32, err error) {
serviceRef := kapi.ObjectReference{
Kind: "Service",
Namespace: svc.Namespace,
Name: svc.Name,
}
p.recorder.Eventf(&serviceRef, kapi.EventTypeWarning,
"PortClaim", "Service: %s/%s requires port: %v to be opened on node, but port cannot be opened, err: %v", svc.Namespace, svc.Name, port, err)
klog.Warningf("PortClaim for svc: %s/%s on port: %v, err: %v", svc.Namespace, svc.Name, port, err)
}
type portClaimWatcher struct {
port portManager
}
func newPortClaimWatcher(recorder record.EventRecorder) (*portClaimWatcher, error) {
localAddrSet, err := getLocalAddrs()
if err != nil {
return nil, err
}
return &portClaimWatcher{
port: &localPortManager{
recorder: recorder,
activeSocketsLock: sync.Mutex{},
portsMap: make(map[utilnet.LocalPort]utilnet.Closeable),
localAddrSet: localAddrSet,
portOpener: &utilnet.ListenPortOpener,
},
}, nil
}
func (p *portClaimWatcher) AddService(svc *kapi.Service) error {
var errors []error
if raw_errors := handleService(svc, p.port.open); len(errors) > 0 {
for _, err := range raw_errors {
errors = append(errors, fmt.Errorf("error claiming port for service: %s/%s: %v", svc.Namespace, svc.Name, err))
}
}
return apierrors.NewAggregate(errors)
}
func (p *portClaimWatcher) UpdateService(old, new *kapi.Service) error {
if reflect.DeepEqual(old.Spec.ExternalIPs, new.Spec.ExternalIPs) && reflect.DeepEqual(old.Spec.Ports, new.Spec.Ports) {
return nil
}
var errors, raw_errors []error
raw_errors = append(raw_errors, handleService(old, p.port.close)...)
raw_errors = append(raw_errors, handleService(new, p.port.open)...)
if len(raw_errors) > 0 {
for _, err := range raw_errors {
errors = append(errors, fmt.Errorf("error updating port claim for service: %s/%s: %v", old.Namespace, old.Name, err))
}
}
return apierrors.NewAggregate(errors)
}
func (p *portClaimWatcher) DeleteService(svc *kapi.Service) error {
var errors []error
if raw_errors := handleService(svc, p.port.close); len(raw_errors) > 0 {
for _, err := range raw_errors {
errors = append(errors, fmt.Errorf("error removing port claim for service: %s/%s: %v", svc.Namespace, svc.Name, err))
}
return apierrors.NewAggregate(errors)
}
return nil
}
func (p *portClaimWatcher) SyncServices(objs []interface{}) error {
return nil
}
func handleService(svc *kapi.Service, handler handler) []error {
errors := []error{}
if !util.ServiceTypeHasNodePort(svc) && len(svc.Spec.ExternalIPs) == 0 {
return errors
}
for _, svcPort := range svc.Spec.Ports {
if util.ServiceTypeHasNodePort(svc) {
klog.V(5).Infof("Handle NodePort service %s port %d", svc.Name, svcPort.NodePort)
if err := handlePort(getDescription(svcPort.Name, svc, true), svc, "", svcPort.NodePort, svcPort.Protocol, handler); err != nil {
errors = append(errors, err)
}
}
for _, externalIP := range svc.Spec.ExternalIPs {
klog.V(5).Infof("Handle ExternalIPs service %s external IP %s port %d", svc.Name, externalIP, svcPort.Port)
if err := handlePort(getDescription(svcPort.Name, svc, false), svc, utilnet.ParseIPSloppy(externalIP).String(), svcPort.Port, svcPort.Protocol, handler); err != nil {
errors = append(errors, err)
}
}
}
return errors
}
// LocalPorts allows to add an arbitrary description, which can be used to distinguish LocalPorts instances having the
// same networking parameters by created for different services.
// kube-proxy and this implementation use the following format of the description: "
//
// for NodePort services - "nodePort for namespace/name[:portName]
// for services with External IPs - "externalIP for namespace/name[:portName]
func getDescription(portName string, svc *kapi.Service, nodePort bool) string {
svcName := types.NamespacedName{Namespace: svc.Namespace, Name: svc.Name}
prefix := externalPortDescr
if nodePort {
prefix = nodePortDescr
}
if len(portName) == 0 {
return fmt.Sprintf("%s %s", prefix, svcName.String())
} else {
return fmt.Sprintf("%s %s:%s", prefix, svcName.String(), portName)
}
}
func handlePort(desc string, svc *kapi.Service, ip string, port int32, protocol kapi.Protocol, handler handler) error {
if err := util.ValidatePort(protocol, port); err != nil {
return fmt.Errorf("invalid service port %s, err: %v", svc.Name, err)
}
if err := handler(desc, ip, port, protocol, svc); err != nil {
return err
}
return nil
}