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vendor: add github.com/cri-o/ocicni

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Signed-off-by: Dan Williams <dcbw@redhat.com>
This commit is contained in:
Dan Williams 2017-09-05 15:06:26 -05:00
parent aec99d6f80
commit 3db6ba7667
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vendor/github.com/cri-o/ocicni/README.md generated vendored Normal file
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# ocicni
API layer to call the CNI plugins from an OCI lifecycle daemon

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vendor/github.com/cri-o/ocicni/pkg/ocicni/noop.go generated vendored Normal file
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package ocicni
type cniNoOp struct {
}
func (noop *cniNoOp) Name() string {
return "CNINoOp"
}
func (noop *cniNoOp) SetUpPod(network PodNetwork) error {
return nil
}
func (noop *cniNoOp) TearDownPod(network PodNetwork) error {
return nil
}
func (noop *cniNoOp) GetPodNetworkStatus(network PodNetwork) (string, error) {
return "", nil
}
func (noop *cniNoOp) Status() error {
return nil
}

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package ocicni
import (
"errors"
"fmt"
"os/exec"
"sort"
"strings"
"sync"
"github.com/containernetworking/cni/libcni"
cnitypes "github.com/containernetworking/cni/pkg/types"
"github.com/fsnotify/fsnotify"
"github.com/sirupsen/logrus"
)
type cniNetworkPlugin struct {
loNetwork *cniNetwork
sync.RWMutex
defaultNetwork *cniNetwork
nsenterPath string
pluginDir string
cniDirs []string
vendorCNIDirPrefix string
monitorNetDirChan chan struct{}
// 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
}
type cniNetwork struct {
name string
NetworkConfig *libcni.NetworkConfigList
CNIConfig libcni.CNI
}
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 (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 &&
event.Op&fsnotify.Write != fsnotify.Write {
continue
}
if err = plugin.syncNetworkConfig(); err == nil {
logrus.Infof("CNI asynchronous setting succeeded")
continue
}
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{}),
pods: make(map[string]*podLock),
}
// 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, []string{".conf", ".conflist", ".json"})
switch {
case err != nil:
return nil, err
case len(files) == 0:
return nil, errMissingDefaultNetwork
}
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
}
logrus.Infof("CNI network %s (type=%v) is used from %s", confList.Name, confList.Plugins[0].Network.Type, confFile)
// Search for vendor-specific plugins as well as default plugins in the CNI codebase.
vendorDir := vendorCNIDir(vendorCNIDirPrefix, confList.Plugins[0].Network.Type)
cninet := &libcni.CNIConfig{
Path: append(cniDirs, vendorDir),
}
network := &cniNetwork{name: confList.Name, NetworkConfig: confList, 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.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)
}
vendorDir := vendorCNIDir(vendorDirPrefix, loConfig.Plugins[0].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(podNetwork PodNetwork) error {
if err := plugin.checkInitialized(); err != nil {
return err
}
plugin.podLock(podNetwork).Lock()
defer plugin.podUnlock(podNetwork)
_, err := plugin.loNetwork.addToNetwork(podNetwork)
if err != nil {
logrus.Errorf("Error while adding to cni lo network: %s", err)
return err
}
_, err = plugin.getDefaultNetwork().addToNetwork(podNetwork)
if err != nil {
logrus.Errorf("Error while adding to cni network: %s", err)
return err
}
return err
}
func (plugin *cniNetworkPlugin) TearDownPod(podNetwork PodNetwork) error {
if err := plugin.checkInitialized(); err != nil {
return err
}
plugin.podLock(podNetwork).Lock()
defer plugin.podUnlock(podNetwork)
return plugin.getDefaultNetwork().deleteFromNetwork(podNetwork)
}
// 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) GetPodNetworkStatus(podNetwork PodNetwork) (string, error) {
plugin.podLock(podNetwork).Lock()
defer plugin.podUnlock(podNetwork)
ip, err := getContainerIP(plugin.nsenterPath, podNetwork.NetNS, DefaultInterfaceName, "-4")
if err != nil {
return "", err
}
return ip.String(), nil
}
func (network *cniNetwork) addToNetwork(podNetwork PodNetwork) (cnitypes.Result, error) {
rt, err := buildCNIRuntimeConf(podNetwork)
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(podNetwork PodNetwork) error {
rt, err := buildCNIRuntimeConf(podNetwork)
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(podNetwork PodNetwork) (*libcni.RuntimeConf, error) {
logrus.Infof("Got pod network %+v", podNetwork)
rt := &libcni.RuntimeConf{
ContainerID: podNetwork.ID,
NetNS: podNetwork.NetNS,
IfName: DefaultInterfaceName,
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 {
return plugin.checkInitialized()
}

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vendor/github.com/cri-o/ocicni/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"
)
// PortMapping maps to the standard CNI portmapping Capability
// see: https://github.com/containernetworking/cni/blob/master/CONVENTIONS.md
type PortMapping struct {
// HostPort is the port number on the host.
HostPort int32 `json:"hostPort"`
// ContainerPort is the port number inside the sandbox.
ContainerPort int32 `json:"containerPort"`
// Protocol is the protocol of the port mapping.
Protocol string `json:"protocol"`
// HostIP is the host ip to use.
HostIP string `json:"hostIP"`
}
// PodNetwork configures the network of a pod sandbox.
type PodNetwork struct {
// Name is the name of the sandbox.
Name string
// Namespace is the namespace of the sandbox.
Namespace string
// ID is the id of the sandbox container.
ID string
// NetNS is the network namespace path of the sandbox.
NetNS string
// PortMappings is the port mapping of the sandbox.
PortMappings []PortMapping
}
// 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 sandbox container of
// the pod has been created but before the other containers of the
// pod are launched.
SetUpPod(network PodNetwork) error
// TearDownPod is the method called before a pod's sandbox container will be deleted
TearDownPod(network PodNetwork) error
// Status is the method called to obtain the ipv4 or ipv6 addresses of the pod sandbox
GetPodNetworkStatus(network PodNetwork) (string, error)
// NetworkStatus returns error if the network plugin is in error state
Status() error
}

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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
}