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Merge pull request #87699 from michaelbeaumont/fix_66766

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kube-proxy: Only open ipv4 sockets for ipv4 clusters
This commit is contained in:
Kubernetes Prow Robot 2020-02-13 23:54:18 -08:00 committed by GitHub
commit ad68c4a8b5
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5 changed files with 36 additions and 20 deletions
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24
pkg/proxy/iptables/proxier.go
View File

@ -241,8 +241,8 @@ type Proxier struct {
type listenPortOpener struct{}
// OpenLocalPort holds the given local port open.
func (l *listenPortOpener) OpenLocalPort(lp *utilproxy.LocalPort) (utilproxy.Closeable, error) {
return openLocalPort(lp)
func (l *listenPortOpener) OpenLocalPort(lp *utilproxy.LocalPort, isIPv6 bool) (utilproxy.Closeable, error) {
return openLocalPort(lp, isIPv6)
}
// Proxier implements proxy.Provider
@ -1051,7 +1051,7 @@ func (proxier *Proxier) syncProxyRules() {
klog.V(4).Infof("Port %s was open before and is still needed", lp.String())
replacementPortsMap[lp] = proxier.portsMap[lp]
} else {
socket, err := proxier.portMapper.OpenLocalPort(&lp)
socket, err := proxier.portMapper.OpenLocalPort(&lp, isIPv6)
if err != nil {
msg := fmt.Sprintf("can't open %s, skipping this externalIP: %v", lp.String(), err)
@ -1220,7 +1220,7 @@ func (proxier *Proxier) syncProxyRules() {
klog.V(4).Infof("Port %s was open before and is still needed", lp.String())
replacementPortsMap[lp] = proxier.portsMap[lp]
} else if svcInfo.Protocol() != v1.ProtocolSCTP {
socket, err := proxier.portMapper.OpenLocalPort(&lp)
socket, err := proxier.portMapper.OpenLocalPort(&lp, isIPv6)
if err != nil {
klog.Errorf("can't open %s, skipping this nodePort: %v", lp.String(), err)
continue
@ -1620,7 +1620,7 @@ func writeBytesLine(buf *bytes.Buffer, bytes []byte) {
buf.WriteByte('\n')
}
func openLocalPort(lp *utilproxy.LocalPort) (utilproxy.Closeable, error) {
func openLocalPort(lp *utilproxy.LocalPort, isIPv6 bool) (utilproxy.Closeable, error) {
// For ports on node IPs, open the actual port and hold it, even though we
// use iptables to redirect traffic.
// This ensures a) that it's safe to use that port and b) that (a) stays
@ -1636,17 +1636,25 @@ func openLocalPort(lp *utilproxy.LocalPort) (utilproxy.Closeable, error) {
var socket utilproxy.Closeable
switch lp.Protocol {
case "tcp":
listener, err := net.Listen("tcp", net.JoinHostPort(lp.IP, strconv.Itoa(lp.Port)))
network := "tcp4"
if isIPv6 {
network = "tcp6"
}
listener, err := net.Listen(network, net.JoinHostPort(lp.IP, strconv.Itoa(lp.Port)))
if err != nil {
return nil, err
}
socket = listener
case "udp":
addr, err := net.ResolveUDPAddr("udp", net.JoinHostPort(lp.IP, strconv.Itoa(lp.Port)))
network := "udp4"
if isIPv6 {
network = "udp6"
}
addr, err := net.ResolveUDPAddr(network, net.JoinHostPort(lp.IP, strconv.Itoa(lp.Port)))
if err != nil {
return nil, err
}
conn, err := net.ListenUDP("udp", addr)
conn, err := net.ListenUDP(network, addr)
if err != nil {
return nil, err
}

2
pkg/proxy/iptables/proxier_test.go
View File

@ -335,7 +335,7 @@ type fakePortOpener struct {
// OpenLocalPort fakes out the listen() and bind() used by syncProxyRules
// to lock a local port.
func (f *fakePortOpener) OpenLocalPort(lp *utilproxy.LocalPort) (utilproxy.Closeable, error) {
func (f *fakePortOpener) OpenLocalPort(lp *utilproxy.LocalPort, isIPv6 bool) (utilproxy.Closeable, error) {
f.openPorts = append(f.openPorts, lp)
return nil, nil
}

26
pkg/proxy/ipvs/proxier.go
View File

@ -1123,6 +1123,7 @@ func (proxier *Proxier) syncProxyRules() {
klog.Errorf("Failed to cast serviceInfo %q", svcName.String())
continue
}
isIPv6 := utilnet.IsIPv6(svcInfo.ClusterIP())
protocol := strings.ToLower(string(svcInfo.Protocol()))
// Precompute svcNameString; with many services the many calls
// to ServicePortName.String() show up in CPU profiles.
@ -1215,7 +1216,7 @@ func (proxier *Proxier) syncProxyRules() {
klog.V(4).Infof("Port %s was open before and is still needed", lp.String())
replacementPortsMap[lp] = proxier.portsMap[lp]
} else {
socket, err := proxier.portMapper.OpenLocalPort(&lp)
socket, err := proxier.portMapper.OpenLocalPort(&lp, isIPv6)
if err != nil {
msg := fmt.Sprintf("can't open %s, skipping this externalIP: %v", lp.String(), err)
@ -1404,13 +1405,12 @@ func (proxier *Proxier) syncProxyRules() {
// We do not start listening on SCTP ports, according to our agreement in the
// SCTP support KEP
} else if svcInfo.Protocol() != v1.ProtocolSCTP {
socket, err := proxier.portMapper.OpenLocalPort(&lp)
socket, err := proxier.portMapper.OpenLocalPort(&lp, isIPv6)
if err != nil {
klog.Errorf("can't open %s, skipping this nodePort: %v", lp.String(), err)
continue
}
if lp.Protocol == "udp" {
isIPv6 := utilnet.IsIPv6(svcInfo.ClusterIP())
conntrack.ClearEntriesForPort(proxier.exec, lp.Port, isIPv6, v1.ProtocolUDP)
}
replacementPortsMap[lp] = socket
@ -2101,11 +2101,11 @@ func writeBytesLine(buf *bytes.Buffer, bytes []byte) {
type listenPortOpener struct{}
// OpenLocalPort holds the given local port open.
func (l *listenPortOpener) OpenLocalPort(lp *utilproxy.LocalPort) (utilproxy.Closeable, error) {
return openLocalPort(lp)
func (l *listenPortOpener) OpenLocalPort(lp *utilproxy.LocalPort, isIPv6 bool) (utilproxy.Closeable, error) {
return openLocalPort(lp, isIPv6)
}
func openLocalPort(lp *utilproxy.LocalPort) (utilproxy.Closeable, error) {
func openLocalPort(lp *utilproxy.LocalPort, isIPv6 bool) (utilproxy.Closeable, error) {
// For ports on node IPs, open the actual port and hold it, even though we
// use ipvs to redirect traffic.
// This ensures a) that it's safe to use that port and b) that (a) stays
@ -2121,17 +2121,25 @@ func openLocalPort(lp *utilproxy.LocalPort) (utilproxy.Closeable, error) {
var socket utilproxy.Closeable
switch lp.Protocol {
case "tcp":
listener, err := net.Listen("tcp", net.JoinHostPort(lp.IP, strconv.Itoa(lp.Port)))
network := "tcp4"
if isIPv6 {
network = "tcp6"
}
listener, err := net.Listen(network, net.JoinHostPort(lp.IP, strconv.Itoa(lp.Port)))
if err != nil {
return nil, err
}
socket = listener
case "udp":
addr, err := net.ResolveUDPAddr("udp", net.JoinHostPort(lp.IP, strconv.Itoa(lp.Port)))
network := "udp4"
if isIPv6 {
network = "udp6"
}
addr, err := net.ResolveUDPAddr(network, net.JoinHostPort(lp.IP, strconv.Itoa(lp.Port)))
if err != nil {
return nil, err
}
conn, err := net.ListenUDP("udp", addr)
conn, err := net.ListenUDP(network, addr)
if err != nil {
return nil, err
}

2
pkg/proxy/ipvs/proxier_test.go
View File

@ -67,7 +67,7 @@ type fakePortOpener struct {
// OpenLocalPort fakes out the listen() and bind() used by syncProxyRules
// to lock a local port.
func (f *fakePortOpener) OpenLocalPort(lp *utilproxy.LocalPort) (utilproxy.Closeable, error) {
func (f *fakePortOpener) OpenLocalPort(lp *utilproxy.LocalPort, isIPv6 bool) (utilproxy.Closeable, error) {
f.openPorts = append(f.openPorts, lp)
return nil, nil
}

2
pkg/proxy/util/port.go
View File

@ -51,7 +51,7 @@ type Closeable interface {
// PortOpener is an interface around port opening/closing.
// Abstracted out for testing.
type PortOpener interface {
OpenLocalPort(lp *LocalPort) (Closeable, error)
OpenLocalPort(lp *LocalPort, isIPv6 bool) (Closeable, error)
}
// RevertPorts is closing ports in replacementPortsMap but not in originalPortsMap. In other words, it only