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ocicni.go
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ocicni.go
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package ocicni
import (
"errors"
"fmt"
"os"
"path"
"sort"
"strings"
"sync"
"github.com/containernetworking/cni/libcni"
cniinvoke "github.com/containernetworking/cni/pkg/invoke"
cnitypes "github.com/containernetworking/cni/pkg/types"
cnicurrent "github.com/containernetworking/cni/pkg/types/current"
cniversion "github.com/containernetworking/cni/pkg/version"
"github.com/fsnotify/fsnotify"
"github.com/sirupsen/logrus"
)
type cniNetworkPlugin struct {
loNetwork *cniNetwork
sync.RWMutex
defaultNetName string
networks map[string]*cniNetwork
nsManager *nsManager
confDir string
binDirs []string
shutdownChan chan struct{}
watcher *fsnotify.Watcher
done *sync.WaitGroup
// The pod map provides synchronization for a given pod's network
// operations. Each pod's setup/teardown/status operations
// are synchronized against each other, but network operations of other
// pods can proceed in parallel.
podsLock sync.Mutex
pods map[string]*podLock
// For testcases
exec cniinvoke.Exec
cacheDir string
}
type cniNetwork struct {
name string
filePath string
NetworkConfig *libcni.NetworkConfigList
CNIConfig *libcni.CNIConfig
}
var errMissingDefaultNetwork = errors.New("Missing CNI default network")
type podLock struct {
// Count of in-flight operations for this pod; when this reaches zero
// the lock can be removed from the pod map
refcount uint
// Lock to synchronize operations for this specific pod
mu sync.Mutex
}
func buildFullPodName(podNetwork PodNetwork) string {
return podNetwork.Namespace + "_" + podNetwork.Name
}
// Lock network operations for a specific pod. If that pod is not yet in
// the pod map, it will be added. The reference count for the pod will
// be increased.
func (plugin *cniNetworkPlugin) podLock(podNetwork PodNetwork) *sync.Mutex {
plugin.podsLock.Lock()
defer plugin.podsLock.Unlock()
fullPodName := buildFullPodName(podNetwork)
lock, ok := plugin.pods[fullPodName]
if !ok {
lock = &podLock{}
plugin.pods[fullPodName] = lock
}
lock.refcount++
return &lock.mu
}
// Unlock network operations for a specific pod. The reference count for the
// pod will be decreased. If the reference count reaches zero, the pod will be
// removed from the pod map.
func (plugin *cniNetworkPlugin) podUnlock(podNetwork PodNetwork) {
plugin.podsLock.Lock()
defer plugin.podsLock.Unlock()
fullPodName := buildFullPodName(podNetwork)
lock, ok := plugin.pods[fullPodName]
if !ok {
logrus.Warningf("Unbalanced pod lock unref for %s", fullPodName)
return
} else if lock.refcount == 0 {
// This should never ever happen, but handle it anyway
delete(plugin.pods, fullPodName)
logrus.Errorf("Pod lock for %s still in map with zero refcount", fullPodName)
return
}
lock.refcount--
lock.mu.Unlock()
if lock.refcount == 0 {
delete(plugin.pods, fullPodName)
}
}
func newWatcher(confDir string) (*fsnotify.Watcher, error) {
// Ensure plugin directory exists, because the following monitoring logic
// relies on that.
if err := os.MkdirAll(confDir, 0755); err != nil {
return nil, fmt.Errorf("failed to create %q: %v", confDir, err)
}
watcher, err := fsnotify.NewWatcher()
if err != nil {
return nil, fmt.Errorf("could not create new watcher %v", err)
}
defer func() {
// Close watcher on error
if err != nil {
watcher.Close()
}
}()
if err = watcher.Add(confDir); err != nil {
return nil, fmt.Errorf("failed to add watch on %q: %v", confDir, err)
}
return watcher, nil
}
func (plugin *cniNetworkPlugin) monitorConfDir(start *sync.WaitGroup) {
start.Done()
plugin.done.Add(1)
defer plugin.done.Done()
for {
select {
case event := <-plugin.watcher.Events:
logrus.Warningf("CNI monitoring event %v", event)
var defaultDeleted bool
createWrite := (event.Op&fsnotify.Create == fsnotify.Create ||
event.Op&fsnotify.Write == fsnotify.Write)
if event.Op&fsnotify.Remove == fsnotify.Remove {
// Care about the event if the default network
// was just deleted
defNet := plugin.getDefaultNetwork()
if defNet != nil && event.Name == defNet.filePath {
defaultDeleted = true
}
}
if !createWrite && !defaultDeleted {
continue
}
if err := plugin.syncNetworkConfig(); err != nil {
logrus.Errorf("CNI config loading failed, continue monitoring: %v", err)
continue
}
case err := <-plugin.watcher.Errors:
if err == nil {
continue
}
logrus.Errorf("CNI monitoring error %v", err)
return
case <-plugin.shutdownChan:
return
}
}
}
// InitCNI takes a binary directory in which to search for CNI plugins, and
// a configuration directory in which to search for CNI JSON config files.
// If no valid CNI configs exist, network requests will fail until valid CNI
// config files are present in the config directory.
// If defaultNetName is not empty, a CNI config with that network name will
// be used as the default CNI network, and container network operations will
// fail until that network config is present and valid.
func InitCNI(defaultNetName string, confDir string, binDirs ...string) (CNIPlugin, error) {
return initCNI(nil, "", defaultNetName, confDir, binDirs...)
}
// Internal function to allow faking out exec functions for testing
func initCNI(exec cniinvoke.Exec, cacheDir, defaultNetName string, confDir string, binDirs ...string) (CNIPlugin, error) {
if confDir == "" {
confDir = DefaultConfDir
}
if len(binDirs) == 0 {
binDirs = []string{DefaultBinDir}
}
plugin := &cniNetworkPlugin{
defaultNetName: defaultNetName,
networks: make(map[string]*cniNetwork),
loNetwork: getLoNetwork(exec, binDirs),
confDir: confDir,
binDirs: binDirs,
shutdownChan: make(chan struct{}),
done: &sync.WaitGroup{},
pods: make(map[string]*podLock),
exec: exec,
cacheDir: cacheDir,
}
if exec == nil {
exec = &cniinvoke.DefaultExec{
RawExec: &cniinvoke.RawExec{Stderr: os.Stderr},
PluginDecoder: cniversion.PluginDecoder{},
}
}
nsm, err := newNSManager()
if err != nil {
return nil, err
}
plugin.nsManager = nsm
plugin.syncNetworkConfig()
plugin.watcher, err = newWatcher(plugin.confDir)
if err != nil {
return nil, err
}
startWg := sync.WaitGroup{}
startWg.Add(1)
go plugin.monitorConfDir(&startWg)
startWg.Wait()
return plugin, nil
}
func (plugin *cniNetworkPlugin) Shutdown() error {
close(plugin.shutdownChan)
plugin.watcher.Close()
plugin.done.Wait()
return nil
}
func loadNetworks(exec cniinvoke.Exec, confDir string, binDirs []string) (map[string]*cniNetwork, string, error) {
files, err := libcni.ConfFiles(confDir, []string{".conf", ".conflist", ".json"})
if err != nil {
return nil, "", err
}
networks := make(map[string]*cniNetwork)
defaultNetName := ""
sort.Strings(files)
for _, confFile := range files {
var confList *libcni.NetworkConfigList
if strings.HasSuffix(confFile, ".conflist") {
confList, err = libcni.ConfListFromFile(confFile)
if err != nil {
logrus.Warningf("Error loading CNI config list file %s: %v", confFile, err)
continue
}
} else {
conf, err := libcni.ConfFromFile(confFile)
if err != nil {
logrus.Warningf("Error loading CNI config file %s: %v", confFile, err)
continue
}
if conf.Network.Type == "" {
logrus.Warningf("Error loading CNI config file %s: no 'type'; perhaps this is a .conflist?", confFile)
continue
}
confList, err = libcni.ConfListFromConf(conf)
if err != nil {
logrus.Warningf("Error converting CNI config file %s to list: %v", confFile, err)
continue
}
}
if len(confList.Plugins) == 0 {
logrus.Warningf("CNI config list %s has no networks, skipping", confFile)
continue
}
if confList.Name == "" {
confList.Name = path.Base(confFile)
}
logrus.Infof("Found CNI network %s (type=%v) at %s", confList.Name, confList.Plugins[0].Network.Type, confFile)
networks[confList.Name] = &cniNetwork{
name: confList.Name,
filePath: confFile,
NetworkConfig: confList,
CNIConfig: libcni.NewCNIConfig(binDirs, exec),
}
if defaultNetName == "" {
defaultNetName = confList.Name
}
}
return networks, defaultNetName, nil
}
func getLoNetwork(exec cniinvoke.Exec, binDirs []string) *cniNetwork {
loConfig, err := libcni.ConfListFromBytes([]byte(`{
"cniVersion": "0.2.0",
"name": "cni-loopback",
"plugins": [{
"type": "loopback"
}]
}`))
if err != nil {
// The hardcoded config above should always be valid and unit tests will
// catch this
panic(err)
}
loNetwork := &cniNetwork{
name: "lo",
NetworkConfig: loConfig,
CNIConfig: libcni.NewCNIConfig(binDirs, exec),
}
return loNetwork
}
func (plugin *cniNetworkPlugin) syncNetworkConfig() error {
networks, defaultNetName, err := loadNetworks(plugin.exec, plugin.confDir, plugin.binDirs)
if err != nil {
return err
}
plugin.Lock()
defer plugin.Unlock()
if plugin.defaultNetName == "" {
plugin.defaultNetName = defaultNetName
}
plugin.networks = networks
return nil
}
func (plugin *cniNetworkPlugin) getNetwork(name string) (*cniNetwork, error) {
plugin.RLock()
defer plugin.RUnlock()
net, ok := plugin.networks[name]
if !ok {
return nil, fmt.Errorf("CNI network %q not found", name)
}
return net, nil
}
func (plugin *cniNetworkPlugin) getDefaultNetworkName() string {
plugin.RLock()
defer plugin.RUnlock()
return plugin.defaultNetName
}
func (plugin *cniNetworkPlugin) getDefaultNetwork() *cniNetwork {
defaultNetName := plugin.getDefaultNetworkName()
if defaultNetName == "" {
return nil
}
network, _ := plugin.getNetwork(defaultNetName)
return network
}
// networksAvailable returns an error if the pod requests no networks and the
// plugin has no default network, and thus the plugin has no idea what network
// to attach the pod to.
func (plugin *cniNetworkPlugin) networksAvailable(podNetwork *PodNetwork) error {
if len(podNetwork.Networks) == 0 && plugin.getDefaultNetwork() == nil {
return errMissingDefaultNetwork
}
return nil
}
func (plugin *cniNetworkPlugin) Name() string {
return CNIPluginName
}
func (plugin *cniNetworkPlugin) forEachNetwork(podNetwork *PodNetwork, forEachFunc func(*cniNetwork, string, *PodNetwork) error) error {
networks := podNetwork.Networks
if len(networks) == 0 {
networks = append(networks, plugin.getDefaultNetworkName())
}
for i, netName := range networks {
// Interface names start at "eth0" and count up for each network
ifName := fmt.Sprintf("eth%d", i)
network, err := plugin.getNetwork(netName)
if err != nil {
logrus.Errorf(err.Error())
return err
}
if err := forEachFunc(network, ifName, podNetwork); err != nil {
return err
}
}
return nil
}
func (plugin *cniNetworkPlugin) SetUpPod(podNetwork PodNetwork) ([]cnitypes.Result, error) {
if err := plugin.networksAvailable(&podNetwork); err != nil {
return nil, err
}
plugin.podLock(podNetwork).Lock()
defer plugin.podUnlock(podNetwork)
_, err := plugin.loNetwork.addToNetwork(plugin.cacheDir, &podNetwork, "lo")
if err != nil {
logrus.Errorf("Error while adding to cni lo network: %s", err)
return nil, err
}
results := make([]cnitypes.Result, 0)
if err := plugin.forEachNetwork(&podNetwork, func(network *cniNetwork, ifName string, podNetwork *PodNetwork) error {
result, err := network.addToNetwork(plugin.cacheDir, podNetwork, ifName)
if err != nil {
logrus.Errorf("Error while adding pod to CNI network %q: %s", network.name, err)
return err
}
results = append(results, result)
return nil
}); err != nil {
return nil, err
}
return results, nil
}
func (plugin *cniNetworkPlugin) TearDownPod(podNetwork PodNetwork) error {
if err := plugin.networksAvailable(&podNetwork); err != nil {
return err
}
plugin.podLock(podNetwork).Lock()
defer plugin.podUnlock(podNetwork)
return plugin.forEachNetwork(&podNetwork, func(network *cniNetwork, ifName string, podNetwork *PodNetwork) error {
if err := network.deleteFromNetwork(plugin.cacheDir, podNetwork, ifName); err != nil {
logrus.Errorf("Error while removing pod from CNI network %q: %s", network.name, err)
return err
}
return nil
})
}
// GetPodNetworkStatus returns IP addressing and interface details for all
// networks attached to the pod.
func (plugin *cniNetworkPlugin) GetPodNetworkStatus(podNetwork PodNetwork) ([]cnitypes.Result, error) {
plugin.podLock(podNetwork).Lock()
defer plugin.podUnlock(podNetwork)
results := make([]cnitypes.Result, 0)
if err := plugin.forEachNetwork(&podNetwork, func(network *cniNetwork, ifName string, podNetwork *PodNetwork) error {
version := "4"
ip, mac, err := getContainerDetails(plugin.nsManager, podNetwork.NetNS, ifName, "-4")
if err != nil {
ip, mac, err = getContainerDetails(plugin.nsManager, podNetwork.NetNS, ifName, "-6")
if err != nil {
return err
}
version = "6"
}
// Until CNI's GET request lands, construct the Result manually
results = append(results, &cnicurrent.Result{
CNIVersion: "0.3.1",
Interfaces: []*cnicurrent.Interface{
{
Name: ifName,
Mac: mac.String(),
Sandbox: podNetwork.NetNS,
},
},
IPs: []*cnicurrent.IPConfig{
{
Version: version,
Interface: cnicurrent.Int(0),
Address: *ip,
},
},
})
return nil
}); err != nil {
return nil, err
}
return results, nil
}
func (network *cniNetwork) addToNetwork(cacheDir string, podNetwork *PodNetwork, ifName string) (cnitypes.Result, error) {
rt, err := buildCNIRuntimeConf(cacheDir, podNetwork, ifName)
if err != nil {
logrus.Errorf("Error adding network: %v", err)
return nil, err
}
netconf, cninet := network.NetworkConfig, network.CNIConfig
logrus.Infof("About to add CNI network %s (type=%v)", netconf.Name, netconf.Plugins[0].Network.Type)
res, err := cninet.AddNetworkList(netconf, rt)
if err != nil {
logrus.Errorf("Error adding network: %v", err)
return nil, err
}
return res, nil
}
func (network *cniNetwork) deleteFromNetwork(cacheDir string, podNetwork *PodNetwork, ifName string) error {
rt, err := buildCNIRuntimeConf(cacheDir, podNetwork, ifName)
if err != nil {
logrus.Errorf("Error deleting network: %v", err)
return err
}
netconf, cninet := network.NetworkConfig, network.CNIConfig
logrus.Infof("About to del CNI network %s (type=%v)", netconf.Name, netconf.Plugins[0].Network.Type)
err = cninet.DelNetworkList(netconf, rt)
if err != nil {
logrus.Errorf("Error deleting network: %v", err)
return err
}
return nil
}
func buildCNIRuntimeConf(cacheDir string, podNetwork *PodNetwork, ifName string) (*libcni.RuntimeConf, error) {
logrus.Infof("Got pod network %+v", podNetwork)
rt := &libcni.RuntimeConf{
ContainerID: podNetwork.ID,
NetNS: podNetwork.NetNS,
CacheDir: cacheDir,
IfName: ifName,
Args: [][2]string{
{"IgnoreUnknown", "1"},
{"K8S_POD_NAMESPACE", podNetwork.Namespace},
{"K8S_POD_NAME", podNetwork.Name},
{"K8S_POD_INFRA_CONTAINER_ID", podNetwork.ID},
},
}
if len(podNetwork.PortMappings) == 0 {
return rt, nil
}
rt.CapabilityArgs = map[string]interface{}{
"portMappings": podNetwork.PortMappings,
}
return rt, nil
}
func (plugin *cniNetworkPlugin) Status() error {
if plugin.getDefaultNetwork() == nil {
return errMissingDefaultNetwork
}
return nil
}