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add ExternalTrafficPolicy support for External IPs in ipvs kubeproxy

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This commit is contained in:
Minhan Xia 2020-03-04 11:29:36 -08:00
parent efc4b12186
commit d527a09192
2 changed files with 48 additions and 15 deletions
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3
pkg/proxy/ipvs/ipset.go
View File

@ -40,6 +40,9 @@ const (
kubeExternalIPSetComment = "Kubernetes service external ip + port for masquerade and filter purpose"
kubeExternalIPSet = "KUBE-EXTERNAL-IP"
kubeExternalIPLocalSetComment = "Kubernetes service external ip + port with externalTrafficPolicy=local"
kubeExternalIPLocalSet = "KUBE-EXTERNAL-IP-LOCAL"
kubeLoadBalancerSetComment = "Kubernetes service lb portal"
kubeLoadBalancerSet = "KUBE-LOAD-BALANCER"

60
pkg/proxy/ipvs/proxier.go
View File

@ -140,6 +140,7 @@ var ipsetInfo = []struct {
{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},
@ -1236,12 +1237,21 @@ func (proxier *Proxier) syncProxyRules() {
Protocol: protocol,
SetType: utilipset.HashIPPort,
}
// We have to SNAT packets to external IPs.
if valid := proxier.ipsetList[kubeExternalIPSet].validateEntry(entry); !valid {
klog.Errorf("%s", fmt.Sprintf(EntryInvalidErr, entry, proxier.ipsetList[kubeExternalIPSet].Name))
continue
if utilfeature.DefaultFeatureGate.Enabled(features.ExternalPolicyForExternalIP) && svcInfo.OnlyNodeLocalEndpoints() {
if valid := proxier.ipsetList[kubeExternalIPLocalSet].validateEntry(entry); !valid {
klog.Errorf("%s", fmt.Sprintf(EntryInvalidErr, entry, proxier.ipsetList[kubeExternalIPLocalSet].Name))
continue
}
proxier.ipsetList[kubeExternalIPLocalSet].activeEntries.Insert(entry.String())
} else {
// We have to SNAT packets to external IPs.
if valid := proxier.ipsetList[kubeExternalIPSet].validateEntry(entry); !valid {
klog.Errorf("%s", fmt.Sprintf(EntryInvalidErr, entry, proxier.ipsetList[kubeExternalIPSet].Name))
continue
}
proxier.ipsetList[kubeExternalIPSet].activeEntries.Insert(entry.String())
}
proxier.ipsetList[kubeExternalIPSet].activeEntries.Insert(entry.String())
// ipvs call
serv := &utilipvs.VirtualServer{
@ -1257,7 +1267,12 @@ func (proxier *Proxier) syncProxyRules() {
if err := proxier.syncService(svcNameString, serv, true); err == nil {
activeIPVSServices[serv.String()] = true
activeBindAddrs[serv.Address.String()] = true
if err := proxier.syncEndpoint(svcName, false, serv); err != nil {
onlyNodeLocalEndpoints := false
if utilfeature.DefaultFeatureGate.Enabled(features.ExternalPolicyForExternalIP) {
onlyNodeLocalEndpoints = svcInfo.OnlyNodeLocalEndpoints()
}
if err := proxier.syncEndpoint(svcName, onlyNodeLocalEndpoints, serv); err != nil {
klog.Errorf("Failed to sync endpoint for service: %v, err: %v", serv, err)
}
} else {
@ -1668,15 +1683,8 @@ func (proxier *Proxier) writeIptablesRules() {
}
}
if !proxier.ipsetList[kubeExternalIPSet].isEmpty() {
// Build masquerade rules for packets to external IPs.
args = append(args[:0],
"-A", string(kubeServicesChain),
"-m", "comment", "--comment", proxier.ipsetList[kubeExternalIPSet].getComment(),
"-m", "set", "--match-set", proxier.ipsetList[kubeExternalIPSet].Name,
"dst,dst",
)
writeLine(proxier.natRules, append(args, "-j", string(KubeMarkMasqChain))...)
// externalIPRules adds iptables rules applies to Service ExternalIPs
externalIPRules := func(args []string) {
// Allow traffic for external IPs that does not come from a bridge (i.e. not from a container)
// nor from a local process to be forwarded to the service.
// This rule roughly translates to "all traffic from off-machine".
@ -1691,6 +1699,28 @@ func (proxier *Proxier) writeIptablesRules() {
writeLine(proxier.natRules, append(dstLocalOnlyArgs, "-j", "ACCEPT")...)
}
if !proxier.ipsetList[kubeExternalIPSet].isEmpty() {
// Build masquerade rules for packets to external IPs.
args = append(args[:0],
"-A", string(kubeServicesChain),
"-m", "comment", "--comment", proxier.ipsetList[kubeExternalIPSet].getComment(),
"-m", "set", "--match-set", proxier.ipsetList[kubeExternalIPSet].Name,
"dst,dst",
)
writeLine(proxier.natRules, append(args, "-j", string(KubeMarkMasqChain))...)
externalIPRules(args)
}
if !proxier.ipsetList[kubeExternalIPLocalSet].isEmpty() {
args = append(args[:0],
"-A", string(kubeServicesChain),
"-m", "comment", "--comment", proxier.ipsetList[kubeExternalIPLocalSet].getComment(),
"-m", "set", "--match-set", proxier.ipsetList[kubeExternalIPLocalSet].Name,
"dst,dst",
)
externalIPRules(args)
}
// -A KUBE-SERVICES -m addrtype --dst-type LOCAL -j KUBE-NODE-PORT
args = append(args[:0],
"-A", string(kubeServicesChain),