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ipsm.go
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ipsm.go
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// Copyright 2018 Microsoft. All rights reserved.
// MIT License
package ipsm
import (
"os"
"os/exec"
"strings"
"syscall"
"github.com/Azure/azure-container-networking/log"
"github.com/Azure/azure-container-networking/npm/util"
)
type ipsEntry struct {
operationFlag string
name string
set string
spec string
}
// IpsetManager stores ipset states.
type IpsetManager struct {
listMap map[string]*Ipset //tracks all set lists.
setMap map[string]*Ipset //label -> []ip
}
// Ipset represents one ipset entry.
type Ipset struct {
name string
elements []string
referCount int
}
// NewIpset creates a new instance for Ipset object.
func NewIpset(setName string) *Ipset {
return &Ipset{
name: setName,
}
}
// NewIpsetManager creates a new instance for IpsetManager object.
func NewIpsetManager() *IpsetManager {
return &IpsetManager{
listMap: make(map[string]*Ipset),
setMap: make(map[string]*Ipset),
}
}
// Exists checks if an element exists in setMap/listMap.
func (ipsMgr *IpsetManager) Exists(key string, val string, kind string) bool {
m := ipsMgr.setMap
if kind == util.IpsetSetListFlag {
m = ipsMgr.listMap
}
if _, exists := m[key]; !exists {
return false
}
for _, elem := range m[key].elements {
if elem == val {
return true
}
}
return false
}
func isNsSet(setName string) bool {
return !strings.Contains(setName, "-") && !strings.Contains(setName, ":")
}
// CreateList creates an ipset list. npm maintains one setlist per namespace label.
func (ipsMgr *IpsetManager) CreateList(listName string) error {
if _, exists := ipsMgr.listMap[listName]; exists {
return nil
}
entry := &ipsEntry{
name: listName,
operationFlag: util.IpsetCreationFlag,
set: util.GetHashedName(listName),
spec: util.IpsetSetListFlag,
}
log.Printf("Creating List: %+v\n", entry)
if _, err := ipsMgr.Run(entry); err != nil {
log.Printf("Error creating ipset list %s.\n", listName)
return err
}
ipsMgr.listMap[listName] = NewIpset(listName)
return nil
}
// DeleteList removes an ipset list.
func (ipsMgr *IpsetManager) DeleteList(listName string) error {
entry := &ipsEntry{
operationFlag: util.IpsetDestroyFlag,
set: util.GetHashedName(listName),
}
errCode, err := ipsMgr.Run(entry)
if err != nil {
if errCode == 1 {
log.Printf("Cannot delete list %s as it's being referred or doesn't exist.\n", listName)
return nil
}
log.Printf("Error deleting ipset %s", listName)
log.Printf("%+v\n", entry)
return err
}
delete(ipsMgr.listMap, listName)
return nil
}
// AddToList inserts an ipset to an ipset list.
func (ipsMgr *IpsetManager) AddToList(listName string, setName string) error {
if ipsMgr.Exists(listName, setName, util.IpsetSetListFlag) {
return nil
}
if err := ipsMgr.CreateList(listName); err != nil {
return err
}
entry := &ipsEntry{
operationFlag: util.IpsetAppendFlag,
set: util.GetHashedName(listName),
spec: util.GetHashedName(setName),
}
if _, err := ipsMgr.Run(entry); err != nil {
log.Printf("Error creating ipset rules. rule: %+v", entry)
return err
}
ipsMgr.listMap[listName].elements = append(ipsMgr.listMap[listName].elements, setName)
return nil
}
// DeleteFromList removes an ipset to an ipset list.
func (ipsMgr *IpsetManager) DeleteFromList(listName string, setName string) error {
if _, exists := ipsMgr.listMap[listName]; !exists {
log.Printf("ipset list with name %s not found", listName)
return nil
}
for i, val := range ipsMgr.listMap[listName].elements {
if val == setName {
ipsMgr.listMap[listName].elements = append(ipsMgr.listMap[listName].elements[:i], ipsMgr.listMap[listName].elements[i+1:]...)
}
}
hashedListName, hashedSetName := util.GetHashedName(listName), util.GetHashedName(setName)
entry := &ipsEntry{
operationFlag: util.IpsetDeletionFlag,
set: hashedListName,
spec: hashedSetName,
}
errCode, err := ipsMgr.Run(entry)
if errCode > 1 && err != nil {
log.Printf("Error deleting ipset entry.\n")
log.Printf("%+v\n", entry)
return err
}
if len(ipsMgr.listMap[listName].elements) == 0 {
if err := ipsMgr.DeleteList(listName); err != nil {
log.Printf("Error deleting ipset list %s.\n", listName)
return err
}
}
return nil
}
// CreateSet creates an ipset.
func (ipsMgr *IpsetManager) CreateSet(setName string) error {
if _, exists := ipsMgr.setMap[setName]; exists {
return nil
}
entry := &ipsEntry{
name: setName,
operationFlag: util.IpsetCreationFlag,
// Use hashed string for set name to avoid string length limit of ipset.
set: util.GetHashedName(setName),
spec: util.IpsetNetHashFlag,
}
log.Printf("Creating Set: %+v\n", entry)
if _, err := ipsMgr.Run(entry); err != nil {
log.Printf("Error creating ipset.\n")
return err
}
ipsMgr.setMap[setName] = NewIpset(setName)
return nil
}
// DeleteSet removes a set from ipset.
func (ipsMgr *IpsetManager) DeleteSet(setName string) error {
if _, exists := ipsMgr.setMap[setName]; !exists {
log.Printf("ipset with name %s not found", setName)
return nil
}
if len(ipsMgr.setMap[setName].elements) > 0 {
return nil
}
entry := &ipsEntry{
operationFlag: util.IpsetDestroyFlag,
set: util.GetHashedName(setName),
}
errCode, err := ipsMgr.Run(entry)
if err != nil {
if errCode == 1 {
log.Printf("Cannot delete set %s as it's being referred.\n", setName)
return nil
}
log.Printf("Error deleting ipset %s\n. Entry: %+v", setName, entry)
return err
}
delete(ipsMgr.setMap, setName)
return nil
}
// AddToSet inserts an ip to an entry in setMap, and creates/updates the corresponding ipset.
func (ipsMgr *IpsetManager) AddToSet(setName string, ip string) error {
if ipsMgr.Exists(setName, ip, util.IpsetNetHashFlag) {
return nil
}
if err := ipsMgr.CreateSet(setName); err != nil {
return err
}
entry := &ipsEntry{
operationFlag: util.IpsetAppendFlag,
set: util.GetHashedName(setName),
spec: ip,
}
if _, err := ipsMgr.Run(entry); err != nil {
log.Printf("Error creating ipset rules.\n")
log.Printf("rule: %+v\n", entry)
return err
}
ipsMgr.setMap[setName].elements = append(ipsMgr.setMap[setName].elements, ip)
return nil
}
// DeleteFromSet removes an ip from an entry in setMap, and delete/update the corresponding ipset.
func (ipsMgr *IpsetManager) DeleteFromSet(setName string, ip string) error {
if _, exists := ipsMgr.setMap[setName]; !exists {
log.Printf("ipset with name %s not found", setName)
return nil
}
for i, val := range ipsMgr.setMap[setName].elements {
if val == ip {
ipsMgr.setMap[setName].elements = append(ipsMgr.setMap[setName].elements[:i], ipsMgr.setMap[setName].elements[i+1:]...)
}
}
entry := &ipsEntry{
operationFlag: util.IpsetDeletionFlag,
set: util.GetHashedName(setName),
spec: ip,
}
if _, err := ipsMgr.Run(entry); err != nil {
log.Printf("Error deleting ipset entry.\n Entry: %+v", entry)
return err
}
return nil
}
// Clean removes all the empty sets & lists under the namespace.
func (ipsMgr *IpsetManager) Clean() error {
for setName, set := range ipsMgr.setMap {
if len(set.elements) > 0 {
continue
}
if err := ipsMgr.DeleteSet(setName); err != nil {
log.Printf("Error cleaning ipset\n")
return err
}
}
for listName, list := range ipsMgr.listMap {
if len(list.elements) > 0 {
continue
}
if err := ipsMgr.DeleteList(listName); err != nil {
log.Printf("Error cleaning ipset list\n")
return err
}
}
return nil
}
// Destroy completely cleans ipset.
func (ipsMgr *IpsetManager) Destroy() error {
entry := &ipsEntry{
operationFlag: util.IpsetFlushFlag,
}
if _, err := ipsMgr.Run(entry); err != nil {
log.Printf("Error flushing ipset\n")
return err
}
entry.operationFlag = util.IpsetDestroyFlag
if _, err := ipsMgr.Run(entry); err != nil {
log.Printf("Error destroying ipset\n")
return err
}
return nil
}
// Run execute an ipset command to update ipset.
func (ipsMgr *IpsetManager) Run(entry *ipsEntry) (int, error) {
cmdName := util.Ipset
cmdArgs := []string{entry.operationFlag, util.IpsetExistFlag}
if len(entry.set) > 0 {
cmdArgs = append(cmdArgs, entry.set)
}
if len(entry.spec) > 0 {
cmdArgs = append(cmdArgs, entry.spec)
}
cmdOut, err := exec.Command(cmdName, cmdArgs...).Output()
log.Printf("%s\n", string(cmdOut))
if msg, failed := err.(*exec.ExitError); failed {
errCode := msg.Sys().(syscall.WaitStatus).ExitStatus()
if errCode > 1 {
log.Printf("There was an error running command: %s\nArguments:%+v", err, cmdArgs)
}
return errCode, err
}
return 0, nil
}
// Save saves ipset to file.
func (ipsMgr *IpsetManager) Save(configFile string) error {
if len(configFile) == 0 {
configFile = util.IpsetConfigFile
}
cmd := exec.Command(util.Ipset, util.IpsetSaveFlag, util.IpsetFileFlag, configFile)
if err := cmd.Start(); err != nil {
log.Printf("Error saving ipset to file.\n")
return err
}
cmd.Wait()
return nil
}
// Restore restores ipset from file.
func (ipsMgr *IpsetManager) Restore(configFile string) error {
if len(configFile) == 0 {
configFile = util.IpsetConfigFile
}
f, err := os.Stat(configFile)
if err != nil {
log.Printf("Error getting file %s stat from ipsm.Restore", configFile)
return err
}
if f.Size() == 0 {
if err := ipsMgr.Destroy(); err != nil {
return err
}
}
cmd := exec.Command(util.Ipset, util.IpsetRestoreFlag, util.IpsetFileFlag, configFile)
if err := cmd.Start(); err != nil {
log.Printf("Error restoring ipset from file.\n")
return err
}
cmd.Wait()
return nil
}