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proxier.go
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proxier.go
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/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package ipvs
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"net"
"os"
"reflect"
"regexp"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"k8s.io/klog/v2"
utilexec "k8s.io/utils/exec"
utilnet "k8s.io/utils/net"
v1 "k8s.io/api/core/v1"
discovery "k8s.io/api/discovery/v1beta1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/version"
"k8s.io/apimachinery/pkg/util/wait"
utilfeature "k8s.io/apiserver/pkg/util/feature"
"k8s.io/client-go/tools/record"
"k8s.io/kubernetes/pkg/features"
"k8s.io/kubernetes/pkg/proxy"
"k8s.io/kubernetes/pkg/proxy/healthcheck"
"k8s.io/kubernetes/pkg/proxy/metaproxier"
"k8s.io/kubernetes/pkg/proxy/metrics"
utilproxy "k8s.io/kubernetes/pkg/proxy/util"
proxyutiliptables "k8s.io/kubernetes/pkg/proxy/util/iptables"
"k8s.io/kubernetes/pkg/util/async"
"k8s.io/kubernetes/pkg/util/conntrack"
utilipset "k8s.io/kubernetes/pkg/util/ipset"
utiliptables "k8s.io/kubernetes/pkg/util/iptables"
utilipvs "k8s.io/kubernetes/pkg/util/ipvs"
utilsysctl "k8s.io/kubernetes/pkg/util/sysctl"
)
const (
// kubeServicesChain is the services portal chain
kubeServicesChain utiliptables.Chain = "KUBE-SERVICES"
// KubeFireWallChain is the kubernetes firewall chain.
KubeFireWallChain utiliptables.Chain = "KUBE-FIREWALL"
// kubePostroutingChain is the kubernetes postrouting chain
kubePostroutingChain utiliptables.Chain = "KUBE-POSTROUTING"
// KubeMarkMasqChain is the mark-for-masquerade chain
KubeMarkMasqChain utiliptables.Chain = "KUBE-MARK-MASQ"
// KubeNodePortChain is the kubernetes node port chain
KubeNodePortChain utiliptables.Chain = "KUBE-NODE-PORT"
// KubeMarkDropChain is the mark-for-drop chain
KubeMarkDropChain utiliptables.Chain = "KUBE-MARK-DROP"
// KubeForwardChain is the kubernetes forward chain
KubeForwardChain utiliptables.Chain = "KUBE-FORWARD"
// KubeLoadBalancerChain is the kubernetes chain for loadbalancer type service
KubeLoadBalancerChain utiliptables.Chain = "KUBE-LOAD-BALANCER"
// DefaultScheduler is the default ipvs scheduler algorithm - round robin.
DefaultScheduler = "rr"
// DefaultDummyDevice is the default dummy interface which ipvs service address will bind to it.
DefaultDummyDevice = "kube-ipvs0"
connReuseMinSupportedKernelVersion = "4.1"
)
// iptablesJumpChain is tables of iptables chains that ipvs proxier used to install iptables or cleanup iptables.
// `to` is the iptables chain we want to operate.
// `from` is the source iptables chain
var iptablesJumpChain = []struct {
table utiliptables.Table
from utiliptables.Chain
to utiliptables.Chain
comment string
}{
{utiliptables.TableNAT, utiliptables.ChainOutput, kubeServicesChain, "kubernetes service portals"},
{utiliptables.TableNAT, utiliptables.ChainPrerouting, kubeServicesChain, "kubernetes service portals"},
{utiliptables.TableNAT, utiliptables.ChainPostrouting, kubePostroutingChain, "kubernetes postrouting rules"},
{utiliptables.TableFilter, utiliptables.ChainForward, KubeForwardChain, "kubernetes forwarding rules"},
}
var iptablesChains = []struct {
table utiliptables.Table
chain utiliptables.Chain
}{
{utiliptables.TableNAT, kubeServicesChain},
{utiliptables.TableNAT, kubePostroutingChain},
{utiliptables.TableNAT, KubeFireWallChain},
{utiliptables.TableNAT, KubeNodePortChain},
{utiliptables.TableNAT, KubeLoadBalancerChain},
{utiliptables.TableNAT, KubeMarkMasqChain},
{utiliptables.TableNAT, KubeMarkDropChain},
{utiliptables.TableFilter, KubeForwardChain},
}
var iptablesCleanupChains = []struct {
table utiliptables.Table
chain utiliptables.Chain
}{
{utiliptables.TableNAT, kubeServicesChain},
{utiliptables.TableNAT, kubePostroutingChain},
{utiliptables.TableNAT, KubeFireWallChain},
{utiliptables.TableNAT, KubeNodePortChain},
{utiliptables.TableNAT, KubeLoadBalancerChain},
{utiliptables.TableFilter, KubeForwardChain},
}
// ipsetInfo is all ipset we needed in ipvs proxier
var ipsetInfo = []struct {
name string
setType utilipset.Type
comment string
}{
{kubeLoopBackIPSet, utilipset.HashIPPortIP, kubeLoopBackIPSetComment},
{kubeClusterIPSet, utilipset.HashIPPort, kubeClusterIPSetComment},
{kubeExternalIPSet, utilipset.HashIPPort, kubeExternalIPSetComment},
{kubeExternalIPLocalSet, utilipset.HashIPPort, kubeExternalIPLocalSetComment},
{kubeLoadBalancerSet, utilipset.HashIPPort, kubeLoadBalancerSetComment},
{kubeLoadbalancerFWSet, utilipset.HashIPPort, kubeLoadbalancerFWSetComment},
{kubeLoadBalancerLocalSet, utilipset.HashIPPort, kubeLoadBalancerLocalSetComment},
{kubeLoadBalancerSourceIPSet, utilipset.HashIPPortIP, kubeLoadBalancerSourceIPSetComment},
{kubeLoadBalancerSourceCIDRSet, utilipset.HashIPPortNet, kubeLoadBalancerSourceCIDRSetComment},
{kubeNodePortSetTCP, utilipset.BitmapPort, kubeNodePortSetTCPComment},
{kubeNodePortLocalSetTCP, utilipset.BitmapPort, kubeNodePortLocalSetTCPComment},
{kubeNodePortSetUDP, utilipset.BitmapPort, kubeNodePortSetUDPComment},
{kubeNodePortLocalSetUDP, utilipset.BitmapPort, kubeNodePortLocalSetUDPComment},
{kubeNodePortSetSCTP, utilipset.HashIPPort, kubeNodePortSetSCTPComment},
{kubeNodePortLocalSetSCTP, utilipset.HashIPPort, kubeNodePortLocalSetSCTPComment},
}
// ipsetWithIptablesChain is the ipsets list with iptables source chain and the chain jump to
// `iptables -t nat -A <from> -m set --match-set <name> <matchType> -j <to>`
// example: iptables -t nat -A KUBE-SERVICES -m set --match-set KUBE-NODE-PORT-TCP dst -j KUBE-NODE-PORT
// ipsets with other match rules will be created Individually.
// Note: kubeNodePortLocalSetTCP must be prior to kubeNodePortSetTCP, the same for UDP.
var ipsetWithIptablesChain = []struct {
name string
from string
to string
matchType string
protocolMatch string
}{
{kubeLoopBackIPSet, string(kubePostroutingChain), "MASQUERADE", "dst,dst,src", ""},
{kubeLoadBalancerSet, string(kubeServicesChain), string(KubeLoadBalancerChain), "dst,dst", ""},
{kubeLoadbalancerFWSet, string(KubeLoadBalancerChain), string(KubeFireWallChain), "dst,dst", ""},
{kubeLoadBalancerSourceCIDRSet, string(KubeFireWallChain), "RETURN", "dst,dst,src", ""},
{kubeLoadBalancerSourceIPSet, string(KubeFireWallChain), "RETURN", "dst,dst,src", ""},
{kubeLoadBalancerLocalSet, string(KubeLoadBalancerChain), "RETURN", "dst,dst", ""},
{kubeNodePortLocalSetTCP, string(KubeNodePortChain), "RETURN", "dst", "tcp"},
{kubeNodePortSetTCP, string(KubeNodePortChain), string(KubeMarkMasqChain), "dst", "tcp"},
{kubeNodePortLocalSetUDP, string(KubeNodePortChain), "RETURN", "dst", "udp"},
{kubeNodePortSetUDP, string(KubeNodePortChain), string(KubeMarkMasqChain), "dst", "udp"},
{kubeNodePortSetSCTP, string(KubeNodePortChain), string(KubeMarkMasqChain), "dst,dst", "sctp"},
{kubeNodePortLocalSetSCTP, string(KubeNodePortChain), "RETURN", "dst,dst", "sctp"},
}
// In IPVS proxy mode, the following flags need to be set
const sysctlRouteLocalnet = "net/ipv4/conf/all/route_localnet"
const sysctlBridgeCallIPTables = "net/bridge/bridge-nf-call-iptables"
const sysctlVSConnTrack = "net/ipv4/vs/conntrack"
const sysctlConnReuse = "net/ipv4/vs/conn_reuse_mode"
const sysctlExpireNoDestConn = "net/ipv4/vs/expire_nodest_conn"
const sysctlExpireQuiescentTemplate = "net/ipv4/vs/expire_quiescent_template"
const sysctlForward = "net/ipv4/ip_forward"
const sysctlArpIgnore = "net/ipv4/conf/all/arp_ignore"
const sysctlArpAnnounce = "net/ipv4/conf/all/arp_announce"
// Proxier is an ipvs based proxy for connections between a localhost:lport
// and services that provide the actual backends.
type Proxier struct {
// endpointsChanges and serviceChanges contains all changes to endpoints and
// services that happened since last syncProxyRules call. For a single object,
// changes are accumulated, i.e. previous is state from before all of them,
// current is state after applying all of those.
endpointsChanges *proxy.EndpointChangeTracker
serviceChanges *proxy.ServiceChangeTracker
mu sync.Mutex // protects the following fields
serviceMap proxy.ServiceMap
endpointsMap proxy.EndpointsMap
portsMap map[utilproxy.LocalPort]utilproxy.Closeable
nodeLabels map[string]string
// endpointsSynced, endpointSlicesSynced, and servicesSynced are set to true when
// corresponding objects are synced after startup. This is used to avoid updating
// ipvs rules with some partial data after kube-proxy restart.
endpointsSynced bool
endpointSlicesSynced bool
servicesSynced bool
initialized int32
syncRunner *async.BoundedFrequencyRunner // governs calls to syncProxyRules
// These are effectively const and do not need the mutex to be held.
syncPeriod time.Duration
minSyncPeriod time.Duration
// Values are CIDR's to exclude when cleaning up IPVS rules.
excludeCIDRs []*net.IPNet
// Set to true to set sysctls arp_ignore and arp_announce
strictARP bool
iptables utiliptables.Interface
ipvs utilipvs.Interface
ipset utilipset.Interface
exec utilexec.Interface
masqueradeAll bool
masqueradeMark string
localDetector proxyutiliptables.LocalTrafficDetector
hostname string
nodeIP net.IP
portMapper utilproxy.PortOpener
recorder record.EventRecorder
serviceHealthServer healthcheck.ServiceHealthServer
healthzServer healthcheck.ProxierHealthUpdater
ipvsScheduler string
// Added as a member to the struct to allow injection for testing.
ipGetter IPGetter
// The following buffers are used to reuse memory and avoid allocations
// that are significantly impacting performance.
iptablesData *bytes.Buffer
filterChainsData *bytes.Buffer
natChains *bytes.Buffer
filterChains *bytes.Buffer
natRules *bytes.Buffer
filterRules *bytes.Buffer
// Added as a member to the struct to allow injection for testing.
netlinkHandle NetLinkHandle
// ipsetList is the list of ipsets that ipvs proxier used.
ipsetList map[string]*IPSet
// Values are as a parameter to select the interfaces which nodeport works.
nodePortAddresses []string
// networkInterfacer defines an interface for several net library functions.
// Inject for test purpose.
networkInterfacer utilproxy.NetworkInterfacer
gracefuldeleteManager *GracefulTerminationManager
}
// IPGetter helps get node network interface IP
type IPGetter interface {
NodeIPs() ([]net.IP, error)
}
// realIPGetter is a real NodeIP handler, it implements IPGetter.
type realIPGetter struct {
// nl is a handle for revoking netlink interface
nl NetLinkHandle
}
// NodeIPs returns all LOCAL type IP addresses from host which are taken as the Node IPs of NodePort service.
// It will list source IP exists in local route table with `kernel` protocol type, and filter out IPVS proxier
// created dummy device `kube-ipvs0` For example,
// $ ip route show table local type local proto kernel
// 10.0.0.1 dev kube-ipvs0 scope host src 10.0.0.1
// 10.0.0.10 dev kube-ipvs0 scope host src 10.0.0.10
// 10.0.0.252 dev kube-ipvs0 scope host src 10.0.0.252
// 100.106.89.164 dev eth0 scope host src 100.106.89.164
// 127.0.0.0/8 dev lo scope host src 127.0.0.1
// 127.0.0.1 dev lo scope host src 127.0.0.1
// 172.17.0.1 dev docker0 scope host src 172.17.0.1
// 192.168.122.1 dev virbr0 scope host src 192.168.122.1
// Then filter out dev==kube-ipvs0, and cut the unique src IP fields,
// Node IP set: [100.106.89.164, 127.0.0.1, 192.168.122.1]
func (r *realIPGetter) NodeIPs() (ips []net.IP, err error) {
// Pass in empty filter device name for list all LOCAL type addresses.
nodeAddress, err := r.nl.GetLocalAddresses("", DefaultDummyDevice)
if err != nil {
return nil, fmt.Errorf("error listing LOCAL type addresses from host, error: %v", err)
}
// translate ip string to IP
for _, ipStr := range nodeAddress.UnsortedList() {
ips = append(ips, net.ParseIP(ipStr))
}
return ips, nil
}
// Proxier implements proxy.Provider
var _ proxy.Provider = &Proxier{}
// parseExcludedCIDRs parses the input strings and returns net.IPNet
// The validation has been done earlier so the error condition will never happen under normal conditions
func parseExcludedCIDRs(excludeCIDRs []string) []*net.IPNet {
var cidrExclusions []*net.IPNet
for _, excludedCIDR := range excludeCIDRs {
_, n, err := net.ParseCIDR(excludedCIDR)
if err != nil {
klog.Errorf("Error parsing exclude CIDR %q, err: %v", excludedCIDR, err)
continue
}
cidrExclusions = append(cidrExclusions, n)
}
return cidrExclusions
}
// NewProxier returns a new Proxier given an iptables and ipvs Interface instance.
// Because of the iptables and ipvs logic, it is assumed that there is only a single Proxier active on a machine.
// An error will be returned if it fails to update or acquire the initial lock.
// Once a proxier is created, it will keep iptables and ipvs rules up to date in the background and
// will not terminate if a particular iptables or ipvs call fails.
func NewProxier(ipt utiliptables.Interface,
ipvs utilipvs.Interface,
ipset utilipset.Interface,
sysctl utilsysctl.Interface,
exec utilexec.Interface,
syncPeriod time.Duration,
minSyncPeriod time.Duration,
excludeCIDRs []string,
strictARP bool,
tcpTimeout time.Duration,
tcpFinTimeout time.Duration,
udpTimeout time.Duration,
masqueradeAll bool,
masqueradeBit int,
localDetector proxyutiliptables.LocalTrafficDetector,
hostname string,
nodeIP net.IP,
recorder record.EventRecorder,
healthzServer healthcheck.ProxierHealthUpdater,
scheduler string,
nodePortAddresses []string,
kernelHandler KernelHandler,
) (*Proxier, error) {
// Set the route_localnet sysctl we need for
if err := utilproxy.EnsureSysctl(sysctl, sysctlRouteLocalnet, 1); err != nil {
return nil, err
}
// Proxy needs br_netfilter and bridge-nf-call-iptables=1 when containers
// are connected to a Linux bridge (but not SDN bridges). Until most
// plugins handle this, log when config is missing
if val, err := sysctl.GetSysctl(sysctlBridgeCallIPTables); err == nil && val != 1 {
klog.Infof("missing br-netfilter module or unset sysctl br-nf-call-iptables; proxy may not work as intended")
}
// Set the conntrack sysctl we need for
if err := utilproxy.EnsureSysctl(sysctl, sysctlVSConnTrack, 1); err != nil {
return nil, err
}
kernelVersionStr, err := kernelHandler.GetKernelVersion()
if err != nil {
return nil, fmt.Errorf("error determining kernel version to find required kernel modules for ipvs support: %v", err)
}
kernelVersion, err := version.ParseGeneric(kernelVersionStr)
if err != nil {
return nil, fmt.Errorf("error parsing kernel version %q: %v", kernelVersionStr, err)
}
if kernelVersion.LessThan(version.MustParseGeneric(connReuseMinSupportedKernelVersion)) {
klog.Errorf("can't set sysctl %s, kernel version must be at least %s", sysctlConnReuse, connReuseMinSupportedKernelVersion)
} else {
// Set the connection reuse mode
if err := utilproxy.EnsureSysctl(sysctl, sysctlConnReuse, 0); err != nil {
return nil, err
}
}
// Set the expire_nodest_conn sysctl we need for
if err := utilproxy.EnsureSysctl(sysctl, sysctlExpireNoDestConn, 1); err != nil {
return nil, err
}
// Set the expire_quiescent_template sysctl we need for
if err := utilproxy.EnsureSysctl(sysctl, sysctlExpireQuiescentTemplate, 1); err != nil {
return nil, err
}
// Set the ip_forward sysctl we need for
if err := utilproxy.EnsureSysctl(sysctl, sysctlForward, 1); err != nil {
return nil, err
}
if strictARP {
// Set the arp_ignore sysctl we need for
if err := utilproxy.EnsureSysctl(sysctl, sysctlArpIgnore, 1); err != nil {
return nil, err
}
// Set the arp_announce sysctl we need for
if err := utilproxy.EnsureSysctl(sysctl, sysctlArpAnnounce, 2); err != nil {
return nil, err
}
}
// Configure IPVS timeouts if any one of the timeout parameters have been set.
// This is the equivalent to running ipvsadm --set, a value of 0 indicates the
// current system timeout should be preserved
if tcpTimeout > 0 || tcpFinTimeout > 0 || udpTimeout > 0 {
if err := ipvs.ConfigureTimeouts(tcpTimeout, tcpFinTimeout, udpTimeout); err != nil {
klog.Warningf("failed to configure IPVS timeouts: %v", err)
}
}
// Generate the masquerade mark to use for SNAT rules.
masqueradeValue := 1 << uint(masqueradeBit)
masqueradeMark := fmt.Sprintf("%#08x/%#08x", masqueradeValue, masqueradeValue)
isIPv6 := utilnet.IsIPv6(nodeIP)
klog.V(2).Infof("nodeIP: %v, isIPv6: %v", nodeIP, isIPv6)
if len(scheduler) == 0 {
klog.Warningf("IPVS scheduler not specified, use %s by default", DefaultScheduler)
scheduler = DefaultScheduler
}
serviceHealthServer := healthcheck.NewServiceHealthServer(hostname, recorder)
endpointSlicesEnabled := utilfeature.DefaultFeatureGate.Enabled(features.EndpointSliceProxying)
proxier := &Proxier{
portsMap: make(map[utilproxy.LocalPort]utilproxy.Closeable),
serviceMap: make(proxy.ServiceMap),
serviceChanges: proxy.NewServiceChangeTracker(newServiceInfo, &isIPv6, recorder),
endpointsMap: make(proxy.EndpointsMap),
endpointsChanges: proxy.NewEndpointChangeTracker(hostname, nil, &isIPv6, recorder, endpointSlicesEnabled),
syncPeriod: syncPeriod,
minSyncPeriod: minSyncPeriod,
excludeCIDRs: parseExcludedCIDRs(excludeCIDRs),
iptables: ipt,
masqueradeAll: masqueradeAll,
masqueradeMark: masqueradeMark,
exec: exec,
localDetector: localDetector,
hostname: hostname,
nodeIP: nodeIP,
portMapper: &listenPortOpener{},
recorder: recorder,
serviceHealthServer: serviceHealthServer,
healthzServer: healthzServer,
ipvs: ipvs,
ipvsScheduler: scheduler,
ipGetter: &realIPGetter{nl: NewNetLinkHandle(isIPv6)},
iptablesData: bytes.NewBuffer(nil),
filterChainsData: bytes.NewBuffer(nil),
natChains: bytes.NewBuffer(nil),
natRules: bytes.NewBuffer(nil),
filterChains: bytes.NewBuffer(nil),
filterRules: bytes.NewBuffer(nil),
netlinkHandle: NewNetLinkHandle(isIPv6),
ipset: ipset,
nodePortAddresses: nodePortAddresses,
networkInterfacer: utilproxy.RealNetwork{},
gracefuldeleteManager: NewGracefulTerminationManager(ipvs),
}
// initialize ipsetList with all sets we needed
proxier.ipsetList = make(map[string]*IPSet)
for _, is := range ipsetInfo {
proxier.ipsetList[is.name] = NewIPSet(ipset, is.name, is.setType, isIPv6, is.comment)
}
burstSyncs := 2
klog.V(2).Infof("ipvs(%s) sync params: minSyncPeriod=%v, syncPeriod=%v, burstSyncs=%d",
ipt.Protocol(), minSyncPeriod, syncPeriod, burstSyncs)
proxier.syncRunner = async.NewBoundedFrequencyRunner("sync-runner", proxier.syncProxyRules, minSyncPeriod, syncPeriod, burstSyncs)
proxier.gracefuldeleteManager.Run()
return proxier, nil
}
// NewDualStackProxier returns a new Proxier for dual-stack operation
func NewDualStackProxier(
ipt [2]utiliptables.Interface,
ipvs utilipvs.Interface,
ipset utilipset.Interface,
sysctl utilsysctl.Interface,
exec utilexec.Interface,
syncPeriod time.Duration,
minSyncPeriod time.Duration,
excludeCIDRs []string,
strictARP bool,
tcpTimeout time.Duration,
tcpFinTimeout time.Duration,
udpTimeout time.Duration,
masqueradeAll bool,
masqueradeBit int,
localDetectors [2]proxyutiliptables.LocalTrafficDetector,
hostname string,
nodeIP [2]net.IP,
recorder record.EventRecorder,
healthzServer healthcheck.ProxierHealthUpdater,
scheduler string,
nodePortAddresses []string,
kernelHandler KernelHandler,
) (proxy.Provider, error) {
safeIpset := newSafeIpset(ipset)
// Create an ipv4 instance of the single-stack proxier
ipv4Proxier, err := NewProxier(ipt[0], ipvs, safeIpset, sysctl,
exec, syncPeriod, minSyncPeriod, filterCIDRs(false, excludeCIDRs), strictARP,
tcpTimeout, tcpFinTimeout, udpTimeout, masqueradeAll, masqueradeBit,
localDetectors[0], hostname, nodeIP[0],
recorder, healthzServer, scheduler, nodePortAddresses, kernelHandler)
if err != nil {
return nil, fmt.Errorf("unable to create ipv4 proxier: %v", err)
}
ipv6Proxier, err := NewProxier(ipt[1], ipvs, safeIpset, sysctl,
exec, syncPeriod, minSyncPeriod, filterCIDRs(true, excludeCIDRs), strictARP,
tcpTimeout, tcpFinTimeout, udpTimeout, masqueradeAll, masqueradeBit,
localDetectors[1], hostname, nodeIP[1],
nil, nil, scheduler, nodePortAddresses, kernelHandler)
if err != nil {
return nil, fmt.Errorf("unable to create ipv6 proxier: %v", err)
}
// Return a meta-proxier that dispatch calls between the two
// single-stack proxier instances
return metaproxier.NewMetaProxier(ipv4Proxier, ipv6Proxier), nil
}
func filterCIDRs(wantIPv6 bool, cidrs []string) []string {
var filteredCIDRs []string
for _, cidr := range cidrs {
if utilnet.IsIPv6CIDRString(cidr) == wantIPv6 {
filteredCIDRs = append(filteredCIDRs, cidr)
}
}
return filteredCIDRs
}
// internal struct for string service information
type serviceInfo struct {
*proxy.BaseServiceInfo
// The following fields are computed and stored for performance reasons.
serviceNameString string
}
// returns a new proxy.ServicePort which abstracts a serviceInfo
func newServiceInfo(port *v1.ServicePort, service *v1.Service, baseInfo *proxy.BaseServiceInfo) proxy.ServicePort {
info := &serviceInfo{BaseServiceInfo: baseInfo}
// Store the following for performance reasons.
svcName := types.NamespacedName{Namespace: service.Namespace, Name: service.Name}
svcPortName := proxy.ServicePortName{NamespacedName: svcName, Port: port.Name}
info.serviceNameString = svcPortName.String()
return info
}
// KernelHandler can handle the current installed kernel modules.
type KernelHandler interface {
GetModules() ([]string, error)
GetKernelVersion() (string, error)
}
// LinuxKernelHandler implements KernelHandler interface.
type LinuxKernelHandler struct {
executor utilexec.Interface
}
// NewLinuxKernelHandler initializes LinuxKernelHandler with exec.
func NewLinuxKernelHandler() *LinuxKernelHandler {
return &LinuxKernelHandler{
executor: utilexec.New(),
}
}
// GetModules returns all installed kernel modules.
func (handle *LinuxKernelHandler) GetModules() ([]string, error) {
// Check whether IPVS required kernel modules are built-in
kernelVersionStr, err := handle.GetKernelVersion()
if err != nil {
return nil, err
}
kernelVersion, err := version.ParseGeneric(kernelVersionStr)
if err != nil {
return nil, fmt.Errorf("error parsing kernel version %q: %v", kernelVersionStr, err)
}
ipvsModules := utilipvs.GetRequiredIPVSModules(kernelVersion)
var bmods, lmods []string
// Find out loaded kernel modules. If this is a full static kernel it will try to verify if the module is compiled using /boot/config-KERNELVERSION
modulesFile, err := os.Open("/proc/modules")
if err == os.ErrNotExist {
klog.Warningf("Failed to read file /proc/modules with error %v. Assuming this is a kernel without loadable modules support enabled", err)
kernelConfigFile := fmt.Sprintf("/boot/config-%s", kernelVersionStr)
kConfig, err := ioutil.ReadFile(kernelConfigFile)
if err != nil {
return nil, fmt.Errorf("Failed to read Kernel Config file %s with error %v", kernelConfigFile, err)
}
for _, module := range ipvsModules {
if match, _ := regexp.Match("CONFIG_"+strings.ToUpper(module)+"=y", kConfig); match {
bmods = append(bmods, module)
}
}
return bmods, nil
}
if err != nil {
return nil, fmt.Errorf("Failed to read file /proc/modules with error %v", err)
}
mods, err := getFirstColumn(modulesFile)
if err != nil {
return nil, fmt.Errorf("failed to find loaded kernel modules: %v", err)
}
builtinModsFilePath := fmt.Sprintf("/lib/modules/%s/modules.builtin", kernelVersionStr)
b, err := ioutil.ReadFile(builtinModsFilePath)
if err != nil {
klog.Warningf("Failed to read file %s with error %v. You can ignore this message when kube-proxy is running inside container without mounting /lib/modules", builtinModsFilePath, err)
}
for _, module := range ipvsModules {
if match, _ := regexp.Match(module+".ko", b); match {
bmods = append(bmods, module)
} else {
// Try to load the required IPVS kernel modules if not built in
err := handle.executor.Command("modprobe", "--", module).Run()
if err != nil {
klog.Warningf("Failed to load kernel module %v with modprobe. "+
"You can ignore this message when kube-proxy is running inside container without mounting /lib/modules", module)
} else {
lmods = append(lmods, module)
}
}
}
mods = append(mods, bmods...)
mods = append(mods, lmods...)
return mods, nil
}
// getFirstColumn reads all the content from r into memory and return a
// slice which consists of the first word from each line.
func getFirstColumn(r io.Reader) ([]string, error) {
b, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
lines := strings.Split(string(b), "\n")
words := make([]string, 0, len(lines))
for i := range lines {
fields := strings.Fields(lines[i])
if len(fields) > 0 {
words = append(words, fields[0])
}
}
return words, nil
}
// GetKernelVersion returns currently running kernel version.
func (handle *LinuxKernelHandler) GetKernelVersion() (string, error) {
kernelVersionFile := "/proc/sys/kernel/osrelease"
fileContent, err := ioutil.ReadFile(kernelVersionFile)
if err != nil {
return "", fmt.Errorf("error reading osrelease file %q: %v", kernelVersionFile, err)
}
return strings.TrimSpace(string(fileContent)), nil
}
// CanUseIPVSProxier returns true if we can use the ipvs Proxier.
// This is determined by checking if all the required kernel modules can be loaded. It may
// return an error if it fails to get the kernel modules information without error, in which
// case it will also return false.
func CanUseIPVSProxier(handle KernelHandler, ipsetver IPSetVersioner) (bool, error) {
mods, err := handle.GetModules()
if err != nil {
return false, fmt.Errorf("error getting installed ipvs required kernel modules: %v", err)
}
loadModules := sets.NewString()
loadModules.Insert(mods...)
kernelVersionStr, err := handle.GetKernelVersion()
if err != nil {
return false, fmt.Errorf("error determining kernel version to find required kernel modules for ipvs support: %v", err)
}
kernelVersion, err := version.ParseGeneric(kernelVersionStr)
if err != nil {
return false, fmt.Errorf("error parsing kernel version %q: %v", kernelVersionStr, err)
}
mods = utilipvs.GetRequiredIPVSModules(kernelVersion)
wantModules := sets.NewString()
wantModules.Insert(mods...)
modules := wantModules.Difference(loadModules).UnsortedList()
var missingMods []string
ConntrackiMissingCounter := 0
for _, mod := range modules {
if strings.Contains(mod, "nf_conntrack") {
ConntrackiMissingCounter++
} else {
missingMods = append(missingMods, mod)
}
}
if ConntrackiMissingCounter == 2 {
missingMods = append(missingMods, "nf_conntrack_ipv4(or nf_conntrack for Linux kernel 4.19 and later)")
}
if len(missingMods) != 0 {
return false, fmt.Errorf("IPVS proxier will not be used because the following required kernel modules are not loaded: %v", missingMods)
}
// Check ipset version
versionString, err := ipsetver.GetVersion()
if err != nil {
return false, fmt.Errorf("error getting ipset version, error: %v", err)
}
if !checkMinVersion(versionString) {
return false, fmt.Errorf("ipset version: %s is less than min required version: %s", versionString, MinIPSetCheckVersion)
}
return true, nil
}
// CleanupIptablesLeftovers removes all iptables rules and chains created by the Proxier
// It returns true if an error was encountered. Errors are logged.
func cleanupIptablesLeftovers(ipt utiliptables.Interface) (encounteredError bool) {
// Unlink the iptables chains created by ipvs Proxier
for _, jc := range iptablesJumpChain {
args := []string{
"-m", "comment", "--comment", jc.comment,
"-j", string(jc.to),
}
if err := ipt.DeleteRule(jc.table, jc.from, args...); err != nil {
if !utiliptables.IsNotFoundError(err) {
klog.Errorf("Error removing iptables rules in ipvs proxier: %v", err)
encounteredError = true
}
}
}
// Flush and remove all of our chains. Flushing all chains before removing them also removes all links between chains first.
for _, ch := range iptablesCleanupChains {
if err := ipt.FlushChain(ch.table, ch.chain); err != nil {
if !utiliptables.IsNotFoundError(err) {
klog.Errorf("Error removing iptables rules in ipvs proxier: %v", err)
encounteredError = true
}
}
}
// Remove all of our chains.
for _, ch := range iptablesCleanupChains {
if err := ipt.DeleteChain(ch.table, ch.chain); err != nil {
if !utiliptables.IsNotFoundError(err) {
klog.Errorf("Error removing iptables rules in ipvs proxier: %v", err)
encounteredError = true
}
}
}
return encounteredError
}
// CleanupLeftovers clean up all ipvs and iptables rules created by ipvs Proxier.
func CleanupLeftovers(ipvs utilipvs.Interface, ipt utiliptables.Interface, ipset utilipset.Interface, cleanupIPVS bool) (encounteredError bool) {
if cleanupIPVS {
// Return immediately when ipvs interface is nil - Probably initialization failed in somewhere.
if ipvs == nil {
return true
}
encounteredError = false
err := ipvs.Flush()
if err != nil {
klog.Errorf("Error flushing IPVS rules: %v", err)
encounteredError = true
}
}
// Delete dummy interface created by ipvs Proxier.
nl := NewNetLinkHandle(false)
err := nl.DeleteDummyDevice(DefaultDummyDevice)
if err != nil {
klog.Errorf("Error deleting dummy device %s created by IPVS proxier: %v", DefaultDummyDevice, err)
encounteredError = true
}
// Clear iptables created by ipvs Proxier.
encounteredError = cleanupIptablesLeftovers(ipt) || encounteredError
// Destroy ip sets created by ipvs Proxier. We should call it after cleaning up
// iptables since we can NOT delete ip set which is still referenced by iptables.
for _, set := range ipsetInfo {
err = ipset.DestroySet(set.name)
if err != nil {
if !utilipset.IsNotFoundError(err) {
klog.Errorf("Error removing ipset %s, error: %v", set.name, err)
encounteredError = true
}
}
}
return encounteredError
}
// Sync is called to synchronize the proxier state to iptables and ipvs as soon as possible.
func (proxier *Proxier) Sync() {
if proxier.healthzServer != nil {
proxier.healthzServer.QueuedUpdate()
}
metrics.SyncProxyRulesLastQueuedTimestamp.SetToCurrentTime()
proxier.syncRunner.Run()
}
// SyncLoop runs periodic work. This is expected to run as a goroutine or as the main loop of the app. It does not return.
func (proxier *Proxier) SyncLoop() {
// Update healthz timestamp at beginning in case Sync() never succeeds.
if proxier.healthzServer != nil {
proxier.healthzServer.Updated()
}
// synthesize "last change queued" time as the informers are syncing.
metrics.SyncProxyRulesLastQueuedTimestamp.SetToCurrentTime()
proxier.syncRunner.Loop(wait.NeverStop)
}
func (proxier *Proxier) setInitialized(value bool) {
var initialized int32
if value {
initialized = 1
}
atomic.StoreInt32(&proxier.initialized, initialized)
}
func (proxier *Proxier) isInitialized() bool {
return atomic.LoadInt32(&proxier.initialized) > 0
}
// OnServiceAdd is called whenever creation of new service object is observed.
func (proxier *Proxier) OnServiceAdd(service *v1.Service) {
proxier.OnServiceUpdate(nil, service)
}
// OnServiceUpdate is called whenever modification of an existing service object is observed.
func (proxier *Proxier) OnServiceUpdate(oldService, service *v1.Service) {
if proxier.serviceChanges.Update(oldService, service) && proxier.isInitialized() {
proxier.Sync()
}
}
// OnServiceDelete is called whenever deletion of an existing service object is observed.
func (proxier *Proxier) OnServiceDelete(service *v1.Service) {
proxier.OnServiceUpdate(service, nil)
}
// OnServiceSynced is called once all the initial event handlers were called and the state is fully propagated to local cache.
func (proxier *Proxier) OnServiceSynced() {
proxier.mu.Lock()
proxier.servicesSynced = true
if utilfeature.DefaultFeatureGate.Enabled(features.EndpointSliceProxying) {
proxier.setInitialized(proxier.endpointSlicesSynced)
} else {
proxier.setInitialized(proxier.endpointsSynced)
}
proxier.mu.Unlock()
// Sync unconditionally - this is called once per lifetime.
proxier.syncProxyRules()
}
// OnEndpointsAdd is called whenever creation of new endpoints object is observed.
func (proxier *Proxier) OnEndpointsAdd(endpoints *v1.Endpoints) {
proxier.OnEndpointsUpdate(nil, endpoints)
}
// OnEndpointsUpdate is called whenever modification of an existing endpoints object is observed.
func (proxier *Proxier) OnEndpointsUpdate(oldEndpoints, endpoints *v1.Endpoints) {
if proxier.endpointsChanges.Update(oldEndpoints, endpoints) && proxier.isInitialized() {
proxier.Sync()
}
}
// OnEndpointsDelete is called whenever deletion of an existing endpoints object is observed.
func (proxier *Proxier) OnEndpointsDelete(endpoints *v1.Endpoints) {
proxier.OnEndpointsUpdate(endpoints, nil)
}
// OnEndpointsSynced is called once all the initial event handlers were called and the state is fully propagated to local cache.
func (proxier *Proxier) OnEndpointsSynced() {
proxier.mu.Lock()
proxier.endpointsSynced = true
proxier.setInitialized(proxier.servicesSynced)
proxier.mu.Unlock()
// Sync unconditionally - this is called once per lifetime.
proxier.syncProxyRules()
}
// OnEndpointSliceAdd is called whenever creation of a new endpoint slice object
// is observed.
func (proxier *Proxier) OnEndpointSliceAdd(endpointSlice *discovery.EndpointSlice) {
if proxier.endpointsChanges.EndpointSliceUpdate(endpointSlice, false) && proxier.isInitialized() {
proxier.Sync()
}
}
// OnEndpointSliceUpdate is called whenever modification of an existing endpoint
// slice object is observed.
func (proxier *Proxier) OnEndpointSliceUpdate(_, endpointSlice *discovery.EndpointSlice) {
if proxier.endpointsChanges.EndpointSliceUpdate(endpointSlice, false) && proxier.isInitialized() {
proxier.Sync()
}
}
// OnEndpointSliceDelete is called whenever deletion of an existing endpoint slice
// object is observed.
func (proxier *Proxier) OnEndpointSliceDelete(endpointSlice *discovery.EndpointSlice) {
if proxier.endpointsChanges.EndpointSliceUpdate(endpointSlice, true) && proxier.isInitialized() {
proxier.Sync()
}
}
// OnEndpointSlicesSynced is called once all the initial event handlers were
// called and the state is fully propagated to local cache.
func (proxier *Proxier) OnEndpointSlicesSynced() {
proxier.mu.Lock()
proxier.endpointSlicesSynced = true
proxier.setInitialized(proxier.servicesSynced)
proxier.mu.Unlock()
// Sync unconditionally - this is called once per lifetime.
proxier.syncProxyRules()
}
// OnNodeAdd is called whenever creation of new node object
// is observed.
func (proxier *Proxier) OnNodeAdd(node *v1.Node) {
if node.Name != proxier.hostname {
klog.Errorf("Received a watch event for a node %s that doesn't match the current node %v", node.Name, proxier.hostname)
return
}
if reflect.DeepEqual(proxier.nodeLabels, node.Labels) {
return
}
proxier.mu.Lock()
proxier.nodeLabels = node.Labels
proxier.mu.Unlock()
proxier.syncProxyRules()
}
// OnNodeUpdate is called whenever modification of an existing
// node object is observed.
func (proxier *Proxier) OnNodeUpdate(oldNode, node *v1.Node) {
if node.Name != proxier.hostname {
klog.Errorf("Received a watch event for a node %s that doesn't match the current node %v", node.Name, proxier.hostname)
return
}
if reflect.DeepEqual(proxier.nodeLabels, node.Labels) {
return
}
proxier.mu.Lock()
proxier.nodeLabels = node.Labels
proxier.mu.Unlock()
proxier.syncProxyRules()
}
// OnNodeDelete is called whenever deletion of an existing node
// object is observed.
func (proxier *Proxier) OnNodeDelete(node *v1.Node) {
if node.Name != proxier.hostname {
klog.Errorf("Received a watch event for a node %s that doesn't match the current node %v", node.Name, proxier.hostname)
return
}
proxier.mu.Lock()
proxier.nodeLabels = nil
proxier.mu.Unlock()
proxier.syncProxyRules()
}
// OnNodeSynced is called once all the initial event handlers were
// called and the state is fully propagated to local cache.
func (proxier *Proxier) OnNodeSynced() {
}
// EntryInvalidErr indicates if an ipset entry is invalid or not
const EntryInvalidErr = "error adding entry %s to ipset %s"
// This is where all of the ipvs calls happen.
// assumes proxier.mu is held
func (proxier *Proxier) syncProxyRules() {
proxier.mu.Lock()