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service.go
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service.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright 2018-2020 Authors of Cilium
package k8s
import (
"fmt"
"net"
"net/url"
"strings"
"time"
"github.com/cilium/cilium/pkg/annotation"
"github.com/cilium/cilium/pkg/cidr"
"github.com/cilium/cilium/pkg/comparator"
"github.com/cilium/cilium/pkg/datapath"
"github.com/cilium/cilium/pkg/ip"
slim_corev1 "github.com/cilium/cilium/pkg/k8s/slim/k8s/api/core/v1"
"github.com/cilium/cilium/pkg/k8s/utils"
"github.com/cilium/cilium/pkg/loadbalancer"
"github.com/cilium/cilium/pkg/logging/logfields"
"github.com/cilium/cilium/pkg/option"
serviceStore "github.com/cilium/cilium/pkg/service/store"
"github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
)
const annotationTopologyAwareHints = "service.kubernetes.io/topology-aware-hints"
func getAnnotationIncludeExternal(svc *slim_corev1.Service) bool {
if value, ok := svc.ObjectMeta.Annotations[annotation.GlobalService]; ok {
return strings.ToLower(value) == "true"
}
return false
}
func getAnnotationShared(svc *slim_corev1.Service) bool {
if value, ok := svc.ObjectMeta.Annotations[annotation.SharedService]; ok {
return strings.ToLower(value) == "true"
}
return getAnnotationIncludeExternal(svc)
}
func getAnnotationTopologyAwareHints(svc *slim_corev1.Service) bool {
if value, ok := svc.ObjectMeta.Annotations[annotationTopologyAwareHints]; ok {
return strings.ToLower(value) == "auto"
}
return false
}
// isValidServiceFrontendIP returns true if the provided service frontend IP address type
// is supported in cilium configuration.
func isValidServiceFrontendIP(netIP net.IP) bool {
if (option.Config.EnableIPv4 && ip.IsIPv4(netIP)) || (option.Config.EnableIPv6 && ip.IsIPv6(netIP)) {
return true
}
return false
}
// ParseServiceID parses a Kubernetes service and returns the ServiceID
func ParseServiceID(svc *slim_corev1.Service) ServiceID {
return ServiceID{
Name: svc.ObjectMeta.Name,
Namespace: svc.ObjectMeta.Namespace,
}
}
// ParseService parses a Kubernetes service and returns a Service.
func ParseService(svc *slim_corev1.Service, nodeAddressing datapath.NodeAddressing) (ServiceID, *Service) {
scopedLog := log.WithFields(logrus.Fields{
logfields.K8sSvcName: svc.ObjectMeta.Name,
logfields.K8sNamespace: svc.ObjectMeta.Namespace,
logfields.K8sAPIVersion: svc.TypeMeta.APIVersion,
logfields.K8sSvcType: svc.Spec.Type,
})
var loadBalancerIPs []string
svcID := ParseServiceID(svc)
var svcType loadbalancer.SVCType
switch svc.Spec.Type {
case slim_corev1.ServiceTypeClusterIP:
svcType = loadbalancer.SVCTypeClusterIP
break
case slim_corev1.ServiceTypeNodePort:
svcType = loadbalancer.SVCTypeNodePort
break
case slim_corev1.ServiceTypeLoadBalancer:
svcType = loadbalancer.SVCTypeLoadBalancer
break
case slim_corev1.ServiceTypeExternalName:
// External-name services must be ignored
return ServiceID{}, nil
default:
scopedLog.Warn("Ignoring k8s service: unsupported type")
return ServiceID{}, nil
}
if svc.Spec.ClusterIP == "" && (!option.Config.EnableNodePort || len(svc.Spec.ExternalIPs) == 0) {
return ServiceID{}, nil
}
var clusterIPs []net.IP
if len(svc.Spec.ClusterIPs) == 0 {
if clsIP := net.ParseIP(svc.Spec.ClusterIP); clsIP != nil {
clusterIPs = []net.IP{clsIP}
}
} else {
// Here we assume that the value of .spec.ClusterIPs[0] is same as that of the .spec.clusterIP
// or else Kubernetes will reject the service with validation error.
for _, ip := range svc.Spec.ClusterIPs {
if parsedIP := net.ParseIP(ip); parsedIP != nil {
clusterIPs = append(clusterIPs, parsedIP)
}
}
}
headless := false
if strings.ToLower(svc.Spec.ClusterIP) == "none" {
headless = true
}
var trafficPolicy loadbalancer.SVCTrafficPolicy
switch svc.Spec.ExternalTrafficPolicy {
case slim_corev1.ServiceExternalTrafficPolicyTypeLocal:
trafficPolicy = loadbalancer.SVCTrafficPolicyLocal
default:
trafficPolicy = loadbalancer.SVCTrafficPolicyCluster
}
for _, ip := range svc.Status.LoadBalancer.Ingress {
if ip.IP != "" {
loadBalancerIPs = append(loadBalancerIPs, ip.IP)
}
}
lbSrcRanges := make([]string, 0, len(svc.Spec.LoadBalancerSourceRanges))
for _, cidrString := range svc.Spec.LoadBalancerSourceRanges {
cidrStringTrimmed := strings.TrimSpace(cidrString)
lbSrcRanges = append(lbSrcRanges, cidrStringTrimmed)
}
svcInfo := NewService(clusterIPs, svc.Spec.ExternalIPs, loadBalancerIPs,
lbSrcRanges, headless, trafficPolicy,
uint16(svc.Spec.HealthCheckNodePort), svc.Labels, svc.Spec.Selector,
svc.GetNamespace(), svcType)
svcInfo.IncludeExternal = getAnnotationIncludeExternal(svc)
svcInfo.Shared = getAnnotationShared(svc)
if svc.Spec.SessionAffinity == slim_corev1.ServiceAffinityClientIP {
svcInfo.SessionAffinity = true
if cfg := svc.Spec.SessionAffinityConfig; cfg != nil && cfg.ClientIP != nil && cfg.ClientIP.TimeoutSeconds != nil {
svcInfo.SessionAffinityTimeoutSec = uint32(*cfg.ClientIP.TimeoutSeconds)
}
if svcInfo.SessionAffinityTimeoutSec == 0 {
svcInfo.SessionAffinityTimeoutSec = uint32(v1.DefaultClientIPServiceAffinitySeconds)
}
}
for _, port := range svc.Spec.Ports {
p := loadbalancer.NewL4Addr(loadbalancer.L4Type(port.Protocol), uint16(port.Port))
portName := loadbalancer.FEPortName(port.Name)
if _, ok := svcInfo.Ports[portName]; !ok {
svcInfo.Ports[portName] = p
}
// TODO(brb) Get rid of this hack by moving the creation of surrogate
// frontends to pkg/service.
//
// This is a hack;-( In the case of NodePort service, we need to create
// surrogate frontends per IP protocol - one with a zero IP addr and
// one per each public iface IP addr.
if svc.Spec.Type == slim_corev1.ServiceTypeNodePort || svc.Spec.Type == slim_corev1.ServiceTypeLoadBalancer {
if option.Config.EnableNodePort && nodeAddressing != nil {
proto := loadbalancer.L4Type(port.Protocol)
port := uint16(port.NodePort)
// This can happen if the service type is NodePort/LoadBalancer but the upstream apiserver
// did not assign any NodePort to the serivce port field.
// For example if `allocateLoadBalancerNodePorts` is set to false in the service
// spec. For more details see -
// https://github.com/kubernetes/enhancements/tree/master/keps/sig-network/1864-disable-lb-node-ports
if port == uint16(0) {
continue
}
id := loadbalancer.ID(0) // will be allocated by k8s_watcher
if _, ok := svcInfo.NodePorts[portName]; !ok {
svcInfo.NodePorts[portName] =
make(map[string]*loadbalancer.L3n4AddrID)
}
if option.Config.EnableIPv4 &&
utils.GetClusterIPByFamily(slim_corev1.IPv4Protocol, svc) != "" {
for _, ip := range nodeAddressing.IPv4().LoadBalancerNodeAddresses() {
nodePortFE := loadbalancer.NewL3n4AddrID(proto, ip, port,
loadbalancer.ScopeExternal, id)
svcInfo.NodePorts[portName][nodePortFE.String()] = nodePortFE
}
}
if option.Config.EnableIPv6 &&
utils.GetClusterIPByFamily(slim_corev1.IPv6Protocol, svc) != "" {
for _, ip := range nodeAddressing.IPv6().LoadBalancerNodeAddresses() {
nodePortFE := loadbalancer.NewL3n4AddrID(proto, ip, port,
loadbalancer.ScopeExternal, id)
svcInfo.NodePorts[portName][nodePortFE.String()] = nodePortFE
}
}
}
}
}
svcInfo.TopologyAware = getAnnotationTopologyAwareHints(svc)
return svcID, svcInfo
}
// ServiceID identifies the Kubernetes service
type ServiceID struct {
Name string `json:"serviceName,omitempty"`
Namespace string `json:"namespace,omitempty"`
}
// String returns the string representation of a service ID
func (s ServiceID) String() string {
return fmt.Sprintf("%s/%s", s.Namespace, s.Name)
}
// EndpointSliceID identifies a Kubernetes EndpointSlice as well as the legacy
// v1.Endpoints.
type EndpointSliceID struct {
ServiceID
EndpointSliceName string
}
// ParseServiceIDFrom returns a ServiceID derived from the given kubernetes
// service FQDN.
func ParseServiceIDFrom(dn string) *ServiceID {
// typical service name "cilium-etcd-client.kube-system.svc"
idx1 := strings.IndexByte(dn, '.')
if idx1 >= 0 {
svc := ServiceID{
Name: dn[:idx1],
}
idx2 := strings.IndexByte(dn[idx1+1:], '.')
if idx2 >= 0 {
// "cilium-etcd-client.kube-system.svc"
// ^idx1+1 ^ idx1+1+idx2
svc.Namespace = dn[idx1+1 : idx1+1+idx2]
} else {
// "cilium-etcd-client.kube-system"
// ^idx1+1
svc.Namespace = dn[idx1+1:]
}
return &svc
}
return nil
}
// +deepequal-gen=true
type NodePortToFrontend map[string]*loadbalancer.L3n4AddrID
// Service is an abstraction for a k8s service that is composed by the frontend IP
// addresses (FEIPs) and the map of the frontend ports (Ports).
//
// +k8s:deepcopy-gen=true
// +deepequal-gen=true
// +deepequal-gen:private-method=true
type Service struct {
// Until deepequal-gen adds support for net.IP we need to compare this field
// manually.
// Whenever creating a new service we should make sure that the FrontendIPs are
// sorted, so we always generate the same string representation.
// +deepequal-gen=false
FrontendIPs []net.IP
IsHeadless bool
// IncludeExternal is true when external endpoints from other clusters
// should be included
IncludeExternal bool
// Shared is true when the service should be exposed/shared to other clusters
Shared bool
// TrafficPolicy controls how backends are selected. If set to "Local", only
// node-local backends are chosen
TrafficPolicy loadbalancer.SVCTrafficPolicy
// HealthCheckNodePort defines on which port the node runs a HTTP health
// check server which may be used by external loadbalancers to determine
// if a node has local backends. This will only have effect if both
// LoadBalancerIPs is not empty and TrafficPolicy is SVCTrafficPolicyLocal.
HealthCheckNodePort uint16
Ports map[loadbalancer.FEPortName]*loadbalancer.L4Addr
// NodePorts stores mapping for port name => NodePort frontend addr string =>
// NodePort fronted addr. The string addr => addr indirection is to avoid
// storing duplicates.
NodePorts map[loadbalancer.FEPortName]NodePortToFrontend
// K8sExternalIPs stores mapping of the endpoint in a string format to the
// externalIP in net.IP format.
//
// Until deepequal-gen adds support for net.IP we need to compare this field
// manually.
// +deepequal-gen=false
K8sExternalIPs map[string]net.IP
// LoadBalancerIPs stores LB IPs assigned to the service (string(IP) => IP).
//
// Until deepequal-gen adds support for net.IP we need to compare this field
// manually.
// +deepequal-gen=false
LoadBalancerIPs map[string]net.IP
LoadBalancerSourceRanges map[string]*cidr.CIDR
Labels map[string]string
Selector map[string]string
// SessionAffinity denotes whether service has the clientIP session affinity
SessionAffinity bool
// SessionAffinityTimeoutSeconds denotes session affinity timeout
SessionAffinityTimeoutSec uint32
// Type is the internal service type
// +deepequal-gen=false
Type loadbalancer.SVCType
// TopologyAware denotes whether service endpoints might have topology aware
// hints
TopologyAware bool
}
// DeepEqual returns true if both the receiver and 'o' are deeply equal.
func (s *Service) DeepEqual(other *Service) bool {
if s == nil {
return other == nil
}
if !ip.UnsortedIPListsAreEqual(s.FrontendIPs, other.FrontendIPs) {
return false
}
if s.Shared != other.Shared || s.IncludeExternal != other.IncludeExternal {
return false
}
if ((s.K8sExternalIPs != nil) && (other.K8sExternalIPs != nil)) || ((s.K8sExternalIPs == nil) != (other.K8sExternalIPs == nil)) {
in, other := s.K8sExternalIPs, other.K8sExternalIPs
if other == nil {
return false
}
if len(in) != len(other) {
return false
}
for key, inValue := range in {
otherValue, present := other[key]
if !present {
return false
}
if !inValue.Equal(otherValue) {
return false
}
}
}
if ((s.LoadBalancerIPs != nil) && (other.LoadBalancerIPs != nil)) || ((s.LoadBalancerIPs == nil) != (other.LoadBalancerIPs == nil)) {
in, other := s.LoadBalancerIPs, other.LoadBalancerIPs
if other == nil {
return false
}
if len(in) != len(other) {
return false
}
for key, inValue := range in {
otherValue, present := other[key]
if !present {
return false
}
if !inValue.Equal(otherValue) {
return false
}
}
}
return s.deepEqual(other)
}
// String returns the string representation of a service resource
func (s *Service) String() string {
if s == nil {
return "nil"
}
ports := make([]string, len(s.Ports))
i := 0
for p := range s.Ports {
ports[i] = string(p)
i++
}
return fmt.Sprintf("frontends:%s/ports=%s/selector=%v", s.FrontendIPs, ports, s.Selector)
}
// IsExternal returns true if the service is expected to serve out-of-cluster endpoints:
func (s Service) IsExternal() bool {
return len(s.Selector) == 0
}
func parseIPs(externalIPs []string) map[string]net.IP {
m := map[string]net.IP{}
for _, externalIP := range externalIPs {
ip := net.ParseIP(externalIP)
if ip != nil {
m[externalIP] = ip
}
}
return m
}
// NewService returns a new Service with the Ports map initialized.
func NewService(ips []net.IP, externalIPs, loadBalancerIPs, loadBalancerSourceRanges []string,
headless bool, trafficPolicy loadbalancer.SVCTrafficPolicy,
healthCheckNodePort uint16, labels, selector map[string]string,
namespace string, svcType loadbalancer.SVCType) *Service {
var (
k8sExternalIPs map[string]net.IP
k8sLoadBalancerIPs map[string]net.IP
)
loadBalancerSourceCIDRs := make(map[string]*cidr.CIDR, len(loadBalancerSourceRanges))
for _, cidrString := range loadBalancerSourceRanges {
cidr, _ := cidr.ParseCIDR(cidrString)
loadBalancerSourceCIDRs[cidr.String()] = cidr
}
// If EnableNodePort is not true we do not want to process
// events which only differ in external or load balancer IPs.
// By omitting these IPs in the returned Service object, they
// are no longer considered in equality checks and thus save
// CPU cycles processing events Cilium will not act upon.
if option.Config.EnableNodePort {
k8sExternalIPs = parseIPs(externalIPs)
k8sLoadBalancerIPs = parseIPs(loadBalancerIPs)
} else if option.Config.BGPAnnounceLBIP {
// The BGP LB Announcement feature requires that
// loadBalancerIPs be parsed. This is because
// an event must occur when a Service's Status field
// is updated with a new Ingress, ultimately triggering a
// BGP announcement. If we do not parse loadBalancerIPs
// this will not occur.
k8sLoadBalancerIPs = parseIPs(loadBalancerIPs)
}
ip.SortIPList(ips)
return &Service{
FrontendIPs: ips,
IsHeadless: headless,
TrafficPolicy: trafficPolicy,
HealthCheckNodePort: healthCheckNodePort,
Ports: map[loadbalancer.FEPortName]*loadbalancer.L4Addr{},
NodePorts: map[loadbalancer.FEPortName]NodePortToFrontend{},
K8sExternalIPs: k8sExternalIPs,
LoadBalancerIPs: k8sLoadBalancerIPs,
LoadBalancerSourceRanges: loadBalancerSourceCIDRs,
Labels: labels,
Selector: selector,
Type: svcType,
}
}
// UniquePorts returns a map of all unique ports configured in the service
func (s *Service) UniquePorts() map[uint16]bool {
// We are not discriminating the different L4 protocols on the same L4
// port so we create the number of unique sets of service IP + service
// port.
uniqPorts := map[uint16]bool{}
for _, p := range s.Ports {
uniqPorts[p.Port] = true
}
return uniqPorts
}
// NewClusterService returns the serviceStore.ClusterService representing a
// Kubernetes Service
func NewClusterService(id ServiceID, k8sService *Service, k8sEndpoints *Endpoints) serviceStore.ClusterService {
svc := serviceStore.NewClusterService(id.Name, id.Namespace)
for key, value := range k8sService.Labels {
svc.Labels[key] = value
}
for key, value := range k8sService.Selector {
svc.Selector[key] = value
}
portConfig := serviceStore.PortConfiguration{}
for portName, port := range k8sService.Ports {
portConfig[string(portName)] = port
}
svc.Frontends = map[string]serviceStore.PortConfiguration{}
for _, feIP := range k8sService.FrontendIPs {
svc.Frontends[feIP.String()] = portConfig
}
svc.Backends = map[string]serviceStore.PortConfiguration{}
for ipString, backend := range k8sEndpoints.Backends {
svc.Backends[ipString] = backend.Ports
}
svc.Shared = k8sService.Shared
svc.IncludeExternal = k8sService.IncludeExternal
return svc
}
// ParseClusterService parses a ClusterService and returns a Service.
// ClusterService is a subset of what a Service can express,
// especially, ClusterService does not have:
// - other service types than ClusterIP
// - an explicit traffic policy, SVCTrafficPolicyCluster is assumed
// - health check node ports
// - NodePorts
// - external IPs
// - LoadBalancerIPs
// - LoadBalancerSourceRanges
// - SessionAffinity
//
// ParseClusterService() is paired with EqualsClusterService() that
// has the above wired in.
func ParseClusterService(svc *serviceStore.ClusterService) *Service {
svcInfo := &Service{
IsHeadless: len(svc.Frontends) == 0,
IncludeExternal: true,
Shared: true,
TrafficPolicy: loadbalancer.SVCTrafficPolicyCluster,
Ports: map[loadbalancer.FEPortName]*loadbalancer.L4Addr{},
Labels: svc.Labels,
Selector: svc.Selector,
Type: loadbalancer.SVCTypeClusterIP,
}
feIPs := make([]net.IP, len(svc.Frontends))
i := 0
for ipStr, ports := range svc.Frontends {
feIPs[i] = net.ParseIP(ipStr)
for name, port := range ports {
p := loadbalancer.NewL4Addr(loadbalancer.L4Type(port.Protocol), uint16(port.Port))
portName := loadbalancer.FEPortName(name)
if _, ok := svcInfo.Ports[portName]; !ok {
svcInfo.Ports[portName] = p
}
}
i++
}
ip.SortIPList(feIPs)
svcInfo.FrontendIPs = feIPs
return svcInfo
}
// EqualsClusterService returns true the given ClusterService would parse into Service if
// ParseClusterService() would be called. This is necessary to avoid memory allocations that
// would be performed by ParseClusterService() when the service already exists.
func (s *Service) EqualsClusterService(svc *serviceStore.ClusterService) bool {
switch {
case (s == nil) != (svc == nil):
return false
case (s == nil) && (svc == nil):
return true
}
feIPs := make([]net.IP, len(svc.Frontends))
fePorts := serviceStore.PortConfiguration{}
i := 0
for ipStr, ports := range svc.Frontends {
feIPs[i] = net.ParseIP(ipStr)
for name, port := range ports {
if _, ok := fePorts[name]; !ok {
fePorts[name] = port
}
}
i++
}
// These comparisons must match the ParseClusterService() function above.
if ip.UnsortedIPListsAreEqual(s.FrontendIPs, feIPs) &&
s.IsHeadless == (len(svc.Frontends) == 0) &&
s.IncludeExternal == true &&
s.Shared == true &&
s.TrafficPolicy == loadbalancer.SVCTrafficPolicyCluster &&
s.HealthCheckNodePort == 0 &&
len(s.NodePorts) == 0 &&
len(s.K8sExternalIPs) == 0 &&
len(s.LoadBalancerIPs) == 0 &&
len(s.LoadBalancerSourceRanges) == 0 &&
comparator.MapStringEquals(s.Labels, svc.Labels) &&
comparator.MapStringEquals(s.Selector, svc.Selector) &&
s.SessionAffinity == false &&
s.SessionAffinityTimeoutSec == 0 &&
s.Type == loadbalancer.SVCTypeClusterIP {
if ((s.Ports == nil) != (fePorts == nil)) ||
len(s.Ports) != len(fePorts) {
return false
}
for portName, port := range s.Ports {
oPort, ok := fePorts[string(portName)]
if !ok {
return false
}
if port.Protocol != oPort.Protocol || port.Port != oPort.Port {
return false
}
}
return true
}
return false
}
type ServiceIPGetter interface {
GetServiceIP(svcID ServiceID) *loadbalancer.L3n4Addr
}
// CreateCustomDialer returns a custom dialer that picks the service IP,
// from the given ServiceIPGetter, if the address the used to dial is a k8s
// service.
func CreateCustomDialer(b ServiceIPGetter, log *logrus.Entry) func(s string, duration time.Duration) (conn net.Conn, e error) {
return func(s string, duration time.Duration) (conn net.Conn, e error) {
// If the service is available, do the service translation to
// the service IP. Otherwise dial with the original service
// name `s`.
u, err := url.Parse(s)
if err == nil {
var svc *ServiceID
// In etcd v3.5.0, 's' doesn't contain the URL Scheme and the u.Host
// will be empty because url.Parse will consider the "host" as the
// url Scheme. If 's' doesn't contain the URL Scheme then we will be
// able to parse the service ID directly from it without the need
// to do url.Parse.
if u.Host != "" {
svc = ParseServiceIDFrom(u.Host)
} else {
svc = ParseServiceIDFrom(s)
}
if svc != nil {
svcIP := b.GetServiceIP(*svc)
if svcIP != nil {
s = svcIP.String()
} else {
log.Debug("Service not found in the service IP getter")
}
} else {
log.WithFields(logrus.Fields{"url-host": u.Host, "url": s}).Debug("Unable to parse etcd service URL into a service ID")
}
log.Debugf("custom dialer based on k8s service backend is dialing to %q", s)
} else {
log.WithError(err).Error("Unable to parse etcd service URL")
}
return net.Dial("tcp", s)
}
}