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port_table.go
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port_table.go
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// Copyright 2020 Antrea 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 portcache
import (
"fmt"
"io"
"net"
"sync"
"antrea.io/antrea/pkg/agent/nodeportlocal/rules"
"k8s.io/client-go/tools/cache"
"k8s.io/klog/v2"
)
const (
NodePortIndex = "nodePortIndex"
PodEndpointIndex = "podEndpointIndex"
PodIPIndex = "podIPIndex"
)
// protocolSocketState represents the state of the socket corresponding to a
// given (Node port, protocol) tuple.
type protocolSocketState int
type ProtocolSocketData struct {
Protocol string
State protocolSocketState
socket io.Closer
}
type NodePortData struct {
NodePort int
PodPort int
PodIP string
Protocol ProtocolSocketData
}
func (d *NodePortData) ProtocolInUse(protocol string) bool {
protocolSocketData := d.Protocol
if protocolSocketData.Protocol == protocol {
return protocolSocketData.State == stateInUse
}
return false
}
type LocalPortOpener interface {
OpenLocalPort(port int, protocol string) (io.Closer, error)
}
type localPortOpener struct{}
type PortTable struct {
PortTableCache cache.Indexer
StartPort int
EndPort int
PortSearchStart int
PodPortRules rules.PodPortRules
LocalPortOpener LocalPortOpener
tableLock sync.RWMutex
}
func GetPortTableKey(obj interface{}) (string, error) {
npData := obj.(*NodePortData)
key := fmt.Sprintf("%d:%s:%d:%s", npData.NodePort, npData.PodIP, npData.PodPort, npData.Protocol.Protocol)
return key, nil
}
func (pt *PortTable) addPortTableCache(npData *NodePortData) error {
if err := pt.PortTableCache.Add(npData); err != nil {
return err
}
return nil
}
func (pt *PortTable) deletePortTableCache(npData *NodePortData) error {
if err := pt.PortTableCache.Delete(npData); err != nil {
return err
}
return nil
}
func (pt *PortTable) getPortTableCacheFromNodePortIndex(index string) (*NodePortData, bool) {
objs, _ := pt.PortTableCache.ByIndex(NodePortIndex, index)
if len(objs) == 0 {
return nil, false
}
return objs[0].(*NodePortData), true
}
func (pt *PortTable) getPortTableCacheFromPodEndpointIndex(index string) (*NodePortData, bool) {
objs, _ := pt.PortTableCache.ByIndex(PodEndpointIndex, index)
if len(objs) == 0 {
return nil, false
}
return objs[0].(*NodePortData), true
}
func (pt *PortTable) getPortTableCacheFromPodIPIndex(index string) ([]*NodePortData, bool) {
var npData []*NodePortData
objs, _ := pt.PortTableCache.ByIndex(PodIPIndex, index)
if len(objs) == 0 {
return nil, false
}
for _, obj := range objs {
npData = append(npData, obj.(*NodePortData))
}
return npData, true
}
func (pt *PortTable) releaseDataFromPortTableCache() error {
for _, obj := range pt.PortTableCache.List() {
data := obj.(*NodePortData)
if err := pt.deletePortTableCache(data); err != nil {
return err
}
}
return nil
}
func NodePortIndexFunc(obj interface{}) ([]string, error) {
npData := obj.(*NodePortData)
nodePortTuple := NodePortProtoFormat(npData.NodePort, npData.Protocol.Protocol)
return []string{nodePortTuple}, nil
}
func PodEndpointIndexFunc(obj interface{}) ([]string, error) {
npData := obj.(*NodePortData)
podEndpointTuple := podIPPortProtoFormat(npData.PodIP, npData.PodPort, npData.Protocol.Protocol)
return []string{podEndpointTuple}, nil
}
func PodIPIndexFunc(obj interface{}) ([]string, error) {
npData := obj.(*NodePortData)
return []string{npData.PodIP}, nil
}
func NewPortTable(start, end int) (*PortTable, error) {
ptable := PortTable{
PortTableCache: cache.NewIndexer(GetPortTableKey, cache.Indexers{
NodePortIndex: NodePortIndexFunc,
PodEndpointIndex: PodEndpointIndexFunc,
PodIPIndex: PodIPIndexFunc,
}),
StartPort: start,
EndPort: end,
PortSearchStart: start,
PodPortRules: rules.InitRules(),
LocalPortOpener: &localPortOpener{},
}
if err := ptable.PodPortRules.Init(); err != nil {
return nil, err
}
return &ptable, nil
}
func (pt *PortTable) CleanupAllEntries() {
pt.tableLock.Lock()
defer pt.tableLock.Unlock()
pt.releaseDataFromPortTableCache()
}
func (pt *PortTable) GetDataForPodIP(ip string) []*NodePortData {
pt.tableLock.RLock()
defer pt.tableLock.RUnlock()
return pt.getDataForPodIP(ip)
}
func (pt *PortTable) getDataForPodIP(ip string) []*NodePortData {
allData, exist := pt.getPortTableCacheFromPodIPIndex(ip)
if exist == false {
return nil
}
return allData
}
func (pt *PortTable) GetEntry(ip string, port int, protocol string) *NodePortData {
pt.tableLock.RLock()
defer pt.tableLock.RUnlock()
// Return pointer to copy of data from the PodEndpointTable.
if data := pt.getEntryByPodIPPortProto(ip, port, protocol); data != nil {
dataCopy := *data
return &dataCopy
}
return nil
}
// podIPPortProtoFormat formats the ip, port and protocol to string ip:port:protocol.
func podIPPortProtoFormat(ip string, port int, protocol string) string {
return fmt.Sprintf("%s:%d:%s", ip, port, protocol)
}
func (pt *PortTable) getEntryByPodIPPortProto(ip string, port int, protocol string) *NodePortData {
data, exists := pt.getPortTableCacheFromPodEndpointIndex(podIPPortProtoFormat(ip, port, protocol))
if exists == false {
return nil
}
return data
}
func (pt *PortTable) RuleExists(podIP string, podPort int, protocol string) bool {
pt.tableLock.RLock()
defer pt.tableLock.RUnlock()
if data := pt.getEntryByPodIPPortProto(podIP, podPort, protocol); data != nil {
return data.ProtocolInUse(protocol)
}
return false
}
// nodePortProtoFormat formats the nodeport, protocol to string port:protocol.
func NodePortProtoFormat(nodeport int, protocol string) string {
return fmt.Sprintf("%d:%s", nodeport, protocol)
}
// openLocalPort binds to the provided port.
// This is inspired by the openLocalPort function in kube-proxy:
// https://github.com/kubernetes/kubernetes/blob/86f8c3ee91b6faec437f97e3991107747d7fc5e8/pkg/proxy/iptables/proxier.go#L1664
func (lpo *localPortOpener) OpenLocalPort(port int, protocol string) (io.Closer, error) {
// For now, NodePortLocal only supports IPv4 and TCP/UDP.
var network string
var socket io.Closer
switch protocol {
case "tcp":
network = "tcp4"
listener, err := net.Listen(network, fmt.Sprintf(":%d", port))
if err != nil {
return nil, err
}
socket = listener
case "udp":
network = "udp4"
addr, err := net.ResolveUDPAddr(network, fmt.Sprintf(":%d", port))
if err != nil {
return nil, err
}
conn, err := net.ListenUDP(network, addr)
if err != nil {
return nil, err
}
socket = conn
}
klog.V(2).InfoS("Opened local port", "port", port)
return socket, nil
}