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Signed-off-by: Xianglin Gao <xlgao@zju.edu.cn>
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Xianglin Gao
2017-05-22 12:20:21 +08:00
parent c541515674
commit 87c704bdf5
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
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Apache License
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http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
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of the following places: within a NOTICE text file distributed
as part of the Derivative Works; within the Source form or
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of the NOTICE file are for informational purposes only and
do not modify the License. You may add Your own attribution
notices within Derivative Works that You distribute, alongside
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that such additional attribution notices cannot be construed
as modifying the License.
You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
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Copyright 2016 Red Hat, Inc.
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# ocicni
API layer to call the CNI plugins from an OCI lifecycle daemon

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package ocicni
type cniNoOp struct {
}
func (noop *cniNoOp) Name() string {
return "CNINoOp"
}
func (noop *cniNoOp) SetUpPod(netnsPath string, namespace string, name string, containerID string) error {
return nil
}
func (noop *cniNoOp) TearDownPod(netnsPath string, namespace string, name string, containerID string) error {
return nil
}
func (noop *cniNoOp) GetContainerNetworkStatus(netnsPath string, namespace string, name string, containerID string) (string, error) {
return "", nil
}
func (noop *cniNoOp) Status() error {
return nil
}

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vendor/github.com/kubernetes-incubator/cri-o/pkg/ocicni/ocicni.go generated vendored Normal file
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package ocicni
import (
"errors"
"fmt"
"os/exec"
"sort"
"sync"
"github.com/Sirupsen/logrus"
"github.com/containernetworking/cni/libcni"
cnitypes "github.com/containernetworking/cni/pkg/types"
"github.com/fsnotify/fsnotify"
)
type cniNetworkPlugin struct {
loNetwork *cniNetwork
sync.RWMutex
defaultNetwork *cniNetwork
nsenterPath string
pluginDir string
cniDirs []string
vendorCNIDirPrefix string
monitorNetDirChan chan struct{}
}
type cniNetwork struct {
name string
NetworkConfig *libcni.NetworkConfig
CNIConfig libcni.CNI
}
var errMissingDefaultNetwork = errors.New("Missing CNI default network")
func (plugin *cniNetworkPlugin) monitorNetDir() {
watcher, err := fsnotify.NewWatcher()
if err != nil {
logrus.Errorf("could not create new watcher %v", err)
return
}
defer watcher.Close()
go func() {
for {
select {
case event := <-watcher.Events:
logrus.Debugf("CNI monitoring event %v", event)
if event.Op&fsnotify.Create != fsnotify.Create {
continue
}
if err = plugin.syncNetworkConfig(); err == nil {
logrus.Debugf("CNI asynchronous setting succeeded")
close(plugin.monitorNetDirChan)
return
}
logrus.Errorf("CNI setting failed, continue monitoring: %v", err)
case err := <-watcher.Errors:
logrus.Errorf("CNI monitoring error %v", err)
close(plugin.monitorNetDirChan)
return
}
}
}()
if err = watcher.Add(plugin.pluginDir); err != nil {
logrus.Error(err)
return
}
<-plugin.monitorNetDirChan
}
// InitCNI takes the plugin directory and cni directories where the cni files should be searched for
// Returns a valid plugin object and any error
func InitCNI(pluginDir string, cniDirs ...string) (CNIPlugin, error) {
plugin := probeNetworkPluginsWithVendorCNIDirPrefix(pluginDir, cniDirs, "")
var err error
plugin.nsenterPath, err = exec.LookPath("nsenter")
if err != nil {
return nil, err
}
// check if a default network exists, otherwise dump the CNI search and return a noop plugin
_, err = getDefaultCNINetwork(plugin.pluginDir, plugin.cniDirs, plugin.vendorCNIDirPrefix)
if err != nil {
if err != errMissingDefaultNetwork {
logrus.Warningf("Error in finding usable CNI plugin - %v", err)
// create a noop plugin instead
return &cniNoOp{}, nil
}
// We do not have a default network, we start the monitoring thread.
go plugin.monitorNetDir()
}
return plugin, nil
}
func probeNetworkPluginsWithVendorCNIDirPrefix(pluginDir string, cniDirs []string, vendorCNIDirPrefix string) *cniNetworkPlugin {
plugin := &cniNetworkPlugin{
defaultNetwork: nil,
loNetwork: getLoNetwork(cniDirs, vendorCNIDirPrefix),
pluginDir: pluginDir,
cniDirs: cniDirs,
vendorCNIDirPrefix: vendorCNIDirPrefix,
monitorNetDirChan: make(chan struct{}),
}
// sync NetworkConfig in best effort during probing.
if err := plugin.syncNetworkConfig(); err != nil {
logrus.Error(err)
}
return plugin
}
func getDefaultCNINetwork(pluginDir string, cniDirs []string, vendorCNIDirPrefix string) (*cniNetwork, error) {
if pluginDir == "" {
pluginDir = DefaultNetDir
}
if len(cniDirs) == 0 {
cniDirs = []string{DefaultCNIDir}
}
files, err := libcni.ConfFiles(pluginDir)
switch {
case err != nil:
return nil, err
case len(files) == 0:
return nil, errMissingDefaultNetwork
}
sort.Strings(files)
for _, confFile := range files {
conf, err := libcni.ConfFromFile(confFile)
if err != nil {
logrus.Warningf("Error loading CNI config file %s: %v", confFile, err)
continue
}
// Search for vendor-specific plugins as well as default plugins in the CNI codebase.
vendorDir := vendorCNIDir(vendorCNIDirPrefix, conf.Network.Type)
cninet := &libcni.CNIConfig{
Path: append(cniDirs, vendorDir),
}
network := &cniNetwork{name: conf.Network.Name, NetworkConfig: conf, CNIConfig: cninet}
return network, nil
}
return nil, fmt.Errorf("No valid networks found in %s", pluginDir)
}
func vendorCNIDir(prefix, pluginType string) string {
return fmt.Sprintf(VendorCNIDirTemplate, prefix, pluginType)
}
func getLoNetwork(cniDirs []string, vendorDirPrefix string) *cniNetwork {
if len(cniDirs) == 0 {
cniDirs = []string{DefaultCNIDir}
}
loConfig, err := libcni.ConfFromBytes([]byte(`{
"cniVersion": "0.1.0",
"name": "cni-loopback",
"type": "loopback"
}`))
if err != nil {
// The hardcoded config above should always be valid and unit tests will
// catch this
panic(err)
}
vendorDir := vendorCNIDir(vendorDirPrefix, loConfig.Network.Type)
cninet := &libcni.CNIConfig{
Path: append(cniDirs, vendorDir),
}
loNetwork := &cniNetwork{
name: "lo",
NetworkConfig: loConfig,
CNIConfig: cninet,
}
return loNetwork
}
func (plugin *cniNetworkPlugin) syncNetworkConfig() error {
network, err := getDefaultCNINetwork(plugin.pluginDir, plugin.cniDirs, plugin.vendorCNIDirPrefix)
if err != nil {
logrus.Errorf("error updating cni config: %s", err)
return err
}
plugin.setDefaultNetwork(network)
return nil
}
func (plugin *cniNetworkPlugin) getDefaultNetwork() *cniNetwork {
plugin.RLock()
defer plugin.RUnlock()
return plugin.defaultNetwork
}
func (plugin *cniNetworkPlugin) setDefaultNetwork(n *cniNetwork) {
plugin.Lock()
defer plugin.Unlock()
plugin.defaultNetwork = n
}
func (plugin *cniNetworkPlugin) checkInitialized() error {
if plugin.getDefaultNetwork() == nil {
return errors.New("cni config uninitialized")
}
return nil
}
func (plugin *cniNetworkPlugin) Name() string {
return CNIPluginName
}
func (plugin *cniNetworkPlugin) SetUpPod(netnsPath string, namespace string, name string, id string) error {
if err := plugin.checkInitialized(); err != nil {
return err
}
_, err := plugin.loNetwork.addToNetwork(name, namespace, id, netnsPath)
if err != nil {
logrus.Errorf("Error while adding to cni lo network: %s", err)
return err
}
_, err = plugin.getDefaultNetwork().addToNetwork(name, namespace, id, netnsPath)
if err != nil {
logrus.Errorf("Error while adding to cni network: %s", err)
return err
}
return err
}
func (plugin *cniNetworkPlugin) TearDownPod(netnsPath string, namespace string, name string, id string) error {
if err := plugin.checkInitialized(); err != nil {
return err
}
return plugin.getDefaultNetwork().deleteFromNetwork(name, namespace, id, netnsPath)
}
// TODO: Use the addToNetwork function to obtain the IP of the Pod. That will assume idempotent ADD call to the plugin.
// Also fix the runtime's call to Status function to be done only in the case that the IP is lost, no need to do periodic calls
func (plugin *cniNetworkPlugin) GetContainerNetworkStatus(netnsPath string, namespace string, name string, id string) (string, error) {
ip, err := getContainerIP(plugin.nsenterPath, netnsPath, DefaultInterfaceName, "-4")
if err != nil {
return "", err
}
return ip.String(), nil
}
func (network *cniNetwork) addToNetwork(podName string, podNamespace string, podInfraContainerID string, podNetnsPath string) (*cnitypes.Result, error) {
rt, err := buildCNIRuntimeConf(podName, podNamespace, podInfraContainerID, podNetnsPath)
if err != nil {
logrus.Errorf("Error adding network: %v", err)
return nil, err
}
netconf, cninet := network.NetworkConfig, network.CNIConfig
logrus.Infof("About to run with conf.Network.Type=%v", netconf.Network.Type)
res, err := cninet.AddNetwork(netconf, rt)
if err != nil {
logrus.Errorf("Error adding network: %v", err)
return nil, err
}
return res, nil
}
func (network *cniNetwork) deleteFromNetwork(podName string, podNamespace string, podInfraContainerID string, podNetnsPath string) error {
rt, err := buildCNIRuntimeConf(podName, podNamespace, podInfraContainerID, podNetnsPath)
if err != nil {
logrus.Errorf("Error deleting network: %v", err)
return err
}
netconf, cninet := network.NetworkConfig, network.CNIConfig
logrus.Infof("About to run with conf.Network.Type=%v", netconf.Network.Type)
err = cninet.DelNetwork(netconf, rt)
if err != nil {
logrus.Errorf("Error deleting network: %v", err)
return err
}
return nil
}
func buildCNIRuntimeConf(podName string, podNs string, podInfraContainerID string, podNetnsPath string) (*libcni.RuntimeConf, error) {
logrus.Infof("Got netns path %v", podNetnsPath)
logrus.Infof("Using netns path %v", podNs)
rt := &libcni.RuntimeConf{
ContainerID: podInfraContainerID,
NetNS: podNetnsPath,
IfName: DefaultInterfaceName,
Args: [][2]string{
{"IgnoreUnknown", "1"},
{"K8S_POD_NAMESPACE", podNs},
{"K8S_POD_NAME", podName},
{"K8S_POD_INFRA_CONTAINER_ID", podInfraContainerID},
},
}
return rt, nil
}
func (plugin *cniNetworkPlugin) Status() error {
return plugin.checkInitialized()
}

35
vendor/github.com/kubernetes-incubator/cri-o/pkg/ocicni/types.go generated vendored Normal file
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package ocicni
const (
// DefaultInterfaceName is the string to be used for the interface name inside the net namespace
DefaultInterfaceName = "eth0"
// CNIPluginName is the default name of the plugin
CNIPluginName = "cni"
// DefaultNetDir is the place to look for CNI Network
DefaultNetDir = "/etc/cni/net.d"
// DefaultCNIDir is the place to look for cni config files
DefaultCNIDir = "/opt/cni/bin"
// VendorCNIDirTemplate is the template for looking up vendor specific cni config/executable files
VendorCNIDirTemplate = "%s/opt/%s/bin"
)
// CNIPlugin is the interface that needs to be implemented by a plugin
type CNIPlugin interface {
// Name returns the plugin's name. This will be used when searching
// for a plugin by name, e.g.
Name() string
// SetUpPod is the method called after the infra container of
// the pod has been created but before the other containers of the
// pod are launched.
SetUpPod(netnsPath string, namespace string, name string, containerID string) error
// TearDownPod is the method called before a pod's infra container will be deleted
TearDownPod(netnsPath string, namespace string, name string, containerID string) error
// Status is the method called to obtain the ipv4 or ipv6 addresses of the container
GetContainerNetworkStatus(netnsPath string, namespace string, name string, containerID string) (string, error)
// NetworkStatus returns error if the network plugin is in error state
Status() error
}

32
vendor/github.com/kubernetes-incubator/cri-o/pkg/ocicni/util.go generated vendored Normal file
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@@ -0,0 +1,32 @@
package ocicni
import (
"fmt"
"net"
"os/exec"
"strings"
)
func getContainerIP(nsenterPath, netnsPath, interfaceName, addrType string) (net.IP, error) {
// Try to retrieve ip inside container network namespace
output, err := exec.Command(nsenterPath, fmt.Sprintf("--net=%s", netnsPath), "-F", "--",
"ip", "-o", addrType, "addr", "show", "dev", interfaceName, "scope", "global").CombinedOutput()
if err != nil {
return nil, fmt.Errorf("Unexpected command output %s with error: %v", output, err)
}
lines := strings.Split(string(output), "\n")
if len(lines) < 1 {
return nil, fmt.Errorf("Unexpected command output %s", output)
}
fields := strings.Fields(lines[0])
if len(fields) < 4 {
return nil, fmt.Errorf("Unexpected address output %s ", lines[0])
}
ip, _, err := net.ParseCIDR(fields[3])
if err != nil {
return nil, fmt.Errorf("CNI failed to parse ip from output %s due to %v", output, err)
}
return ip, nil
}