/
multus.go
547 lines (469 loc) · 17.5 KB
/
multus.go
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// Copyright (c) 2017 Intel Corporation
//
// 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.
// This is a "Multi-plugin".The delegate concept refered from CNI project
// It reads other plugin netconf, and then invoke them, e.g.
// flannel or sriov plugin.
package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"net"
"os"
"path/filepath"
"strings"
"time"
"github.com/containernetworking/cni/libcni"
"github.com/containernetworking/cni/pkg/invoke"
"github.com/containernetworking/cni/pkg/skel"
cnitypes "github.com/containernetworking/cni/pkg/types"
cniversion "github.com/containernetworking/cni/pkg/version"
"github.com/containernetworking/plugins/pkg/ns"
k8s "github.com/intel/multus-cni/k8sclient"
"github.com/intel/multus-cni/logging"
"github.com/intel/multus-cni/types"
"github.com/vishvananda/netlink"
"k8s.io/apimachinery/pkg/util/wait"
)
var version = "master@git"
var commit = "unknown commit"
var date = "unknown date"
var defaultReadinessBackoff = wait.Backoff{
Steps: 4,
Duration: 250 * time.Millisecond,
Factor: 4.0,
Jitter: 0.1,
}
func printVersionString() string {
return fmt.Sprintf("multus-cni version:%s, commit:%s, date:%s",
version, commit, date)
}
func saveScratchNetConf(containerID, dataDir string, netconf []byte) error {
logging.Debugf("saveScratchNetConf: %s, %s, %s", containerID, dataDir, string(netconf))
if err := os.MkdirAll(dataDir, 0700); err != nil {
return logging.Errorf("failed to create the multus data directory(%q): %v", dataDir, err)
}
path := filepath.Join(dataDir, containerID)
err := ioutil.WriteFile(path, netconf, 0600)
if err != nil {
return logging.Errorf("failed to write container data in the path(%q): %v", path, err)
}
return err
}
func consumeScratchNetConf(containerID, dataDir string) ([]byte, string, error) {
logging.Debugf("consumeScratchNetConf: %s, %s", containerID, dataDir)
path := filepath.Join(dataDir, containerID)
b, err := ioutil.ReadFile(path)
return b, path, err
}
func getIfname(delegate *types.DelegateNetConf, argif string, idx int) string {
logging.Debugf("getIfname: %v, %s, %d", delegate, argif, idx)
if delegate.IfnameRequest != "" {
return delegate.IfnameRequest
}
if delegate.MasterPlugin {
// master plugin always uses the CNI-provided interface name
return argif
}
// Otherwise construct a unique interface name from the delegate's
// position in the delegate list
return fmt.Sprintf("net%d", idx)
}
func saveDelegates(containerID, dataDir string, delegates []*types.DelegateNetConf) error {
logging.Debugf("saveDelegates: %s, %s, %v", containerID, dataDir, delegates)
delegatesBytes, err := json.Marshal(delegates)
if err != nil {
return logging.Errorf("error serializing delegate netconf: %v", err)
}
if err = saveScratchNetConf(containerID, dataDir, delegatesBytes); err != nil {
return logging.Errorf("error in saving the delegates : %v", err)
}
return err
}
func deleteDelegates(containerID, dataDir string) error {
logging.Debugf("deleteDelegates: %s, %s", containerID, dataDir)
path := filepath.Join(dataDir, containerID)
if err := os.Remove(path); err != nil {
return logging.Errorf("error in deleting the delegates : %v", err)
}
return nil
}
func validateIfName(nsname string, ifname string) error {
logging.Debugf("validateIfName: %s, %s", nsname, ifname)
podNs, err := ns.GetNS(nsname)
if err != nil {
return logging.Errorf("no netns: %v", err)
}
err = podNs.Do(func(_ ns.NetNS) error {
_, err := netlink.LinkByName(ifname)
if err != nil {
if err.Error() == "Link not found" {
return nil
}
return err
}
return logging.Errorf("ifname %s is already exist", ifname)
})
return err
}
func conflistAdd(rt *libcni.RuntimeConf, rawnetconflist []byte, binDir string, exec invoke.Exec) (cnitypes.Result, error) {
logging.Debugf("conflistAdd: %v, %s, %s", rt, string(rawnetconflist), binDir)
// In part, adapted from K8s pkg/kubelet/dockershim/network/cni/cni.go
binDirs := filepath.SplitList(os.Getenv("CNI_PATH"))
binDirs = append(binDirs, binDir)
cniNet := libcni.NewCNIConfig(binDirs, exec)
confList, err := libcni.ConfListFromBytes(rawnetconflist)
if err != nil {
return nil, logging.Errorf("error in converting the raw bytes to conflist: %v", err)
}
result, err := cniNet.AddNetworkList(context.Background(), confList, rt)
if err != nil {
return nil, logging.Errorf("error in getting result from AddNetworkList: %v", err)
}
return result, nil
}
func conflistDel(rt *libcni.RuntimeConf, rawnetconflist []byte, binDir string, exec invoke.Exec) error {
logging.Debugf("conflistDel: %v, %s, %s", rt, string(rawnetconflist), binDir)
// In part, adapted from K8s pkg/kubelet/dockershim/network/cni/cni.go
binDirs := filepath.SplitList(os.Getenv("CNI_PATH"))
binDirs = append(binDirs, binDir)
cniNet := libcni.NewCNIConfig(binDirs, exec)
confList, err := libcni.ConfListFromBytes(rawnetconflist)
if err != nil {
return logging.Errorf("error in converting the raw bytes to conflist: %v", err)
}
err = cniNet.DelNetworkList(context.Background(), confList, rt)
if err != nil {
return logging.Errorf("error in getting result from DelNetworkList: %v", err)
}
return err
}
func delegateAdd(exec invoke.Exec, ifName string, delegate *types.DelegateNetConf, rt *libcni.RuntimeConf, binDir string, cniArgs string) (cnitypes.Result, error) {
logging.Debugf("delegateAdd: %v, %s, %v, %v, %s", exec, ifName, delegate, rt, binDir)
if os.Setenv("CNI_IFNAME", ifName) != nil {
return nil, logging.Errorf("Multus: error in setting CNI_IFNAME")
}
if err := validateIfName(os.Getenv("CNI_NETNS"), ifName); err != nil {
return nil, logging.Errorf("cannot set %q ifname to %q: %v", delegate.Conf.Type, ifName, err)
}
if delegate.MacRequest != "" || delegate.IPRequest != "" {
if cniArgs != "" {
cniArgs = fmt.Sprintf("%s;IgnoreUnknown=true", cniArgs)
} else {
cniArgs = "IgnoreUnknown=true"
}
if delegate.MacRequest != "" {
// validate Mac address
_, err := net.ParseMAC(delegate.MacRequest)
if err != nil {
return nil, logging.Errorf("failed to parse mac address %q", delegate.MacRequest)
}
cniArgs = fmt.Sprintf("%s;MAC=%s", cniArgs, delegate.MacRequest)
logging.Debugf("Set MAC address %q to %q", delegate.MacRequest, ifName)
}
if delegate.IPRequest != "" {
// validate IP address
if strings.Contains(delegate.IPRequest, "/") {
_, _, err := net.ParseCIDR(delegate.IPRequest)
if err != nil {
return nil, logging.Errorf("failed to parse CIDR %q", delegate.MacRequest)
}
} else if net.ParseIP(delegate.IPRequest) == nil {
return nil, logging.Errorf("failed to parse IP address %q", delegate.IPRequest)
}
cniArgs = fmt.Sprintf("%s;IP=%s", cniArgs, delegate.IPRequest)
logging.Debugf("Set IP address %q to %q", delegate.IPRequest, ifName)
}
if os.Setenv("CNI_ARGS", cniArgs) != nil {
return nil, logging.Errorf("cannot set %q mac to %q and ip to %q", delegate.Conf.Type, delegate.MacRequest, delegate.IPRequest)
}
}
var result cnitypes.Result
var err error
if delegate.ConfListPlugin {
result, err = conflistAdd(rt, delegate.Bytes, binDir, exec)
if err != nil {
return nil, logging.Errorf("Multus: error in invoke Conflist add - %q: %v", delegate.ConfList.Name, err)
}
} else {
result, err = invoke.DelegateAdd(context.Background(), delegate.Conf.Type, delegate.Bytes, exec)
if err != nil {
return nil, logging.Errorf("Multus: error in invoke Delegate add - %q: %v", delegate.Conf.Type, err)
}
}
if logging.GetLoggingLevel() >= logging.VerboseLevel {
data, _ := json.Marshal(result)
var confName string
if delegate.ConfListPlugin {
confName = delegate.ConfList.Name
} else {
confName = delegate.Conf.Name
}
logging.Verbosef("Add: %s:%s:%s:%s %s", rt.Args[1][1], rt.Args[2][1], confName, rt.IfName, string(data))
}
return result, nil
}
func delegateDel(exec invoke.Exec, ifName string, delegateConf *types.DelegateNetConf, rt *libcni.RuntimeConf, binDir string) error {
logging.Debugf("delegateDel: %v, %s, %v, %v, %s", exec, ifName, delegateConf, rt, binDir)
if os.Setenv("CNI_IFNAME", ifName) != nil {
return logging.Errorf("Multus: error in setting CNI_IFNAME")
}
if logging.GetLoggingLevel() >= logging.VerboseLevel {
var confName string
if delegateConf.ConfListPlugin {
confName = delegateConf.ConfList.Name
} else {
confName = delegateConf.Conf.Name
}
logging.Verbosef("Del: %s:%s:%s:%s %s", rt.Args[1][1], rt.Args[2][1], confName, rt.IfName, string(delegateConf.Bytes))
}
var err error
if delegateConf.ConfListPlugin {
err = conflistDel(rt, delegateConf.Bytes, binDir, exec)
if err != nil {
return logging.Errorf("Multus: error in invoke Conflist Del - %q: %v", delegateConf.ConfList.Name, err)
}
} else {
if err = invoke.DelegateDel(context.Background(), delegateConf.Conf.Type, delegateConf.Bytes, exec); err != nil {
return logging.Errorf("Multus: error in invoke Delegate del - %q: %v", delegateConf.Conf.Type, err)
}
}
return err
}
func delPlugins(exec invoke.Exec, argIfname string, delegates []*types.DelegateNetConf, lastIdx int, rt *libcni.RuntimeConf, binDir string) error {
logging.Debugf("delPlugins: %v, %s, %v, %d, %v, %s", exec, argIfname, delegates, lastIdx, rt, binDir)
if os.Setenv("CNI_COMMAND", "DEL") != nil {
return logging.Errorf("Multus: error in setting CNI_COMMAND to DEL")
}
var errorstrings []string
for idx := lastIdx; idx >= 0; idx-- {
ifName := getIfname(delegates[idx], argIfname, idx)
rt.IfName = ifName
// Attempt to delete all but do not error out, instead, collect all errors.
if err := delegateDel(exec, ifName, delegates[idx], rt, binDir); err != nil {
errorstrings = append(errorstrings, err.Error())
}
}
// Check if we had any errors, and send them all back.
if len(errorstrings) > 0 {
return fmt.Errorf(strings.Join(errorstrings, " / "))
}
return nil
}
func cmdAdd(args *skel.CmdArgs, exec invoke.Exec, kubeClient k8s.KubeClient) (cnitypes.Result, error) {
n, err := types.LoadNetConf(args.StdinData)
logging.Debugf("cmdAdd: %v, %v, %v", args, exec, kubeClient)
if err != nil {
return nil, logging.Errorf("err in loading netconf: %v", err)
}
k8sArgs, err := k8s.GetK8sArgs(args)
if err != nil {
return nil, logging.Errorf("Multus: Err in getting k8s args: %v", err)
}
wait.ExponentialBackoff(defaultReadinessBackoff, func() (bool, error) {
_, err := os.Stat(n.ReadinessIndicatorFile)
switch {
case err == nil:
return true, nil
default:
return false, nil
}
})
if n.ClusterNetwork != "" {
err = k8s.GetDefaultNetworks(k8sArgs, n, kubeClient)
if err != nil {
return nil, logging.Errorf("Multus: Failed to get clusterNetwork/defaultNetworks: %v", err)
}
// First delegate is always the master plugin
n.Delegates[0].MasterPlugin = true
}
_, kc, err := k8s.TryLoadPodDelegates(k8sArgs, n, kubeClient)
if err != nil {
return nil, logging.Errorf("Multus: Err in loading K8s Delegates k8s args: %v", err)
}
// cache the multus config
if err := saveDelegates(args.ContainerID, n.CNIDir, n.Delegates); err != nil {
return nil, logging.Errorf("Multus: Err in saving the delegates: %v", err)
}
var result, tmpResult cnitypes.Result
var netStatus []*types.NetworkStatus
cniArgs := os.Getenv("CNI_ARGS")
for idx, delegate := range n.Delegates {
ifName := getIfname(delegate, args.IfName, idx)
rt := types.CreateCNIRuntimeConf(args, k8sArgs, ifName, n.RuntimeConfig)
tmpResult, err = delegateAdd(exec, ifName, delegate, rt, n.BinDir, cniArgs)
if err != nil {
// If the add failed, tear down all networks we already added
netName := delegate.Conf.Name
if netName == "" {
netName = delegate.ConfList.Name
}
// Ignore errors; DEL must be idempotent anyway
_ = delPlugins(exec, args.IfName, n.Delegates, idx, rt, n.BinDir)
return nil, logging.Errorf("Multus: Err adding pod to network %q: %v", netName, err)
}
// Master plugin result is always used if present
if delegate.MasterPlugin || result == nil {
result = tmpResult
}
//create the network status, only in case Multus as kubeconfig
if n.Kubeconfig != "" && kc != nil {
if !types.CheckSystemNamespaces(kc.Podnamespace, n.SystemNamespaces) {
delegateNetStatus, err := types.LoadNetworkStatus(tmpResult, delegate.Conf.Name, delegate.MasterPlugin)
if err != nil {
return nil, logging.Errorf("Multus: Err in setting network status: %v", err)
}
netStatus = append(netStatus, delegateNetStatus)
}
}
}
//set the network status annotation in apiserver, only in case Multus as kubeconfig
if n.Kubeconfig != "" && kc != nil {
if !types.CheckSystemNamespaces(kc.Podnamespace, n.SystemNamespaces) {
err = k8s.SetNetworkStatus(kubeClient, k8sArgs, netStatus, n)
if err != nil {
return nil, logging.Errorf("Multus: Err set the networks status: %v", err)
}
}
}
return result, nil
}
func cmdGet(args *skel.CmdArgs, exec invoke.Exec, kubeClient k8s.KubeClient) (cnitypes.Result, error) {
logging.Debugf("cmdGet: %v, %v, %v", args, exec, kubeClient)
in, err := types.LoadNetConf(args.StdinData)
if err != nil {
return nil, err
}
// FIXME: call all delegates
return in.PrevResult, nil
}
func cmdDel(args *skel.CmdArgs, exec invoke.Exec, kubeClient k8s.KubeClient) error {
in, err := types.LoadNetConf(args.StdinData)
logging.Debugf("cmdDel: %v, %v, %v", args, exec, kubeClient)
if err != nil {
return err
}
if args.Netns == "" {
return nil
}
netnsfound := true
netns, err := ns.GetNS(args.Netns)
if err != nil {
// if NetNs is passed down by the Cloud Orchestration Engine, or if it called multiple times
// so don't return an error if the device is already removed.
// https://github.com/kubernetes/kubernetes/issues/43014#issuecomment-287164444
_, ok := err.(ns.NSPathNotExistErr)
if ok {
netnsfound = false
logging.Debugf("cmdDel: WARNING netns may not exist, netns: %s, err: %s", netns, err)
} else {
return fmt.Errorf("failed to open netns %q: %v", netns, err)
}
}
if netns != nil {
defer netns.Close()
}
k8sArgs, err := k8s.GetK8sArgs(args)
if err != nil {
return logging.Errorf("Multus: Err in getting k8s args: %v", err)
}
// Read the cache to get delegates json for the pod
netconfBytes, path, err := consumeScratchNetConf(args.ContainerID, in.CNIDir)
if err != nil {
// Fetch delegates again if cache is not exist
if os.IsNotExist(err) {
if in.ClusterNetwork != "" {
err = k8s.GetDefaultNetworks(k8sArgs, in, kubeClient)
if err != nil {
return logging.Errorf("Multus: Failed to get clusterNetwork/defaultNetworks: %v", err)
}
// First delegate is always the master plugin
in.Delegates[0].MasterPlugin = true
}
// Get pod annotation and so on
_, _, err := k8s.TryLoadPodDelegates(k8sArgs, in, kubeClient)
if err != nil {
if len(in.Delegates) == 0 {
// No delegate available so send error
return logging.Errorf("Multus: failed to get delegates: %v", err)
}
// Get clusterNetwork before, so continue to delete
logging.Errorf("Multus: failed to get delegates: %v, but continue to delete clusterNetwork", err)
}
} else {
return logging.Errorf("Multus: Err in reading the delegates: %v", err)
}
} else {
defer os.Remove(path)
if err := json.Unmarshal(netconfBytes, &in.Delegates); err != nil {
return logging.Errorf("Multus: failed to load netconf: %v", err)
}
// check plugins field and enable ConfListPlugin if there is
for _, v := range in.Delegates {
if len(v.ConfList.Plugins) != 0 {
v.ConfListPlugin = true
}
}
// First delegate is always the master plugin
in.Delegates[0].MasterPlugin = true
}
// unset the network status annotation in apiserver, only in case Multus as kubeconfig
if in.Kubeconfig != "" {
if netnsfound {
if !types.CheckSystemNamespaces(string(k8sArgs.K8S_POD_NAMESPACE), in.SystemNamespaces) {
err := k8s.SetNetworkStatus(kubeClient, k8sArgs, nil, in)
if err != nil {
// error happen but continue to delete
logging.Errorf("Multus: Err unset the networks status: %v", err)
}
}
} else {
logging.Debugf("WARNING: Unset SetNetworkStatus skipped due to netns not found.")
}
}
rt := types.CreateCNIRuntimeConf(args, k8sArgs, "", in.RuntimeConfig)
return delPlugins(exec, args.IfName, in.Delegates, len(in.Delegates)-1, rt, in.BinDir)
}
func main() {
// Init command line flags to clear vendored packages' one, especially in init()
flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
// add version flag
versionOpt := false
flag.BoolVar(&versionOpt, "version", false, "Show application version")
flag.BoolVar(&versionOpt, "v", false, "Show application version")
flag.Parse()
if versionOpt == true {
fmt.Printf("%s\n", printVersionString())
return
}
skel.PluginMain(
func(args *skel.CmdArgs) error {
result, err := cmdAdd(args, nil, nil)
if err != nil {
return err
}
return result.Print()
},
func(args *skel.CmdArgs) error {
result, err := cmdGet(args, nil, nil)
if err != nil {
return err
}
return result.Print()
},
func(args *skel.CmdArgs) error { return cmdDel(args, nil, nil) },
cniversion.All, "meta-plugin that delegates to other CNI plugins")
}