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main.go
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main.go
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/*
* Copyright (c) 2021 Baidu, Inc. All Rights Reserved.
*
* 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.
*
*/
package main
import (
"context"
"encoding/json"
"errors"
"fmt"
"net"
"os"
"path/filepath"
"runtime"
"github.com/containernetworking/cni/pkg/skel"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/cni/pkg/types/current"
bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
"github.com/vishvananda/netlink"
"github.com/baidubce/baiducloud-cce-cni-driver/pkg/cni"
"github.com/baidubce/baiducloud-cce-cni-driver/pkg/rpc"
log "github.com/baidubce/baiducloud-cce-cni-driver/pkg/util/logger"
networkutil "github.com/baidubce/baiducloud-cce-cni-driver/pkg/util/network"
netlinkwrapper "github.com/baidubce/baiducloud-cce-cni-driver/pkg/wrapper/netlink"
)
const (
logFile = "/var/log/cce/cni-eni-ipam.log"
toContainerRulePriority = 512
fromContainerRulePriority = 1536
mainRouteTableID = 254
defaultRouteTableIDOffset = 127
)
func init() {
// this ensures that main runs only on main thread (thread group leader).
// since namespace ops (unshare, setns) are done for a single thread, we
// must ensure that the goroutine does not jump from OS thread to thread
runtime.LockOSThread()
}
// K8SArgs k8s pod args
type K8SArgs struct {
types.CommonArgs `json:"commonArgs"`
// IP is pod's ip address
IP net.IP `json:"ip"`
// K8S_POD_NAME is pod's name
K8S_POD_NAME types.UnmarshallableString `json:"k8s_pod_name"`
// K8S_POD_NAMESPACE is pod's namespace
K8S_POD_NAMESPACE types.UnmarshallableString `json:"k8s_pod_namespace"`
// K8S_POD_INFRA_CONTAINER_ID is pod's container ID
K8S_POD_INFRA_CONTAINER_ID types.UnmarshallableString `json:"k8s_pod_infra_container_id"`
}
// loadIPAMConf
func loadIPAMConf(stdinData []byte) (*IPAMConf, string, error) {
n := NetConf{}
if err := json.Unmarshal(stdinData, &n); err != nil {
return nil, "", err
}
if n.IPAM == nil {
return nil, "", fmt.Errorf("IPAM config missing 'ipam' key")
}
if n.IPAM.Endpoint == "" {
return nil, "", fmt.Errorf("ipam endpoint is empty")
}
if n.IPAM.RouteTableIDOffset == 0 {
n.IPAM.RouteTableIDOffset = defaultRouteTableIDOffset
}
if n.IPAM.ENILinkPrefix == "" {
n.IPAM.ENILinkPrefix = "eth"
}
return n.IPAM, n.CNIVersion, nil
}
func loadK8SArgs(envArgs string) (*K8SArgs, error) {
k8sArgs := K8SArgs{}
if envArgs != "" {
err := types.LoadArgs(envArgs, &k8sArgs)
if err != nil {
return nil, err
}
}
return &k8sArgs, nil
}
func main() {
cni.InitFlags(logFile)
defer log.Flush()
logDir := filepath.Dir(logFile)
if err := os.Mkdir(logDir, 0755); err != nil && !os.IsExist(err) {
fmt.Printf("mkdir %v failed: %v", logDir, err)
os.Exit(1)
}
if e := skel.PluginMainWithError(cmdAdd, cmdCheck, cmdDel, cni.PluginSupportedVersions, bv.BuildString("eni-ipam")); e != nil {
log.Flush()
if err := e.Print(); err != nil {
log.Errorf(context.TODO(), "Error writing error JSON to stdout: %v", err)
}
os.Exit(1)
}
}
func cmdAdd(args *skel.CmdArgs) error {
ctx := log.NewContext()
log.Infof(ctx, "====> CmdAdd Begins <====")
defer log.Infof(ctx, "====> CmdAdd Ends <====")
log.Infof(ctx, "[cmdAdd]: containerID: %v, netns: %v, ifName: %v, args: %v, path: %v",
args.ContainerID, args.Netns, args.IfName, args.Args, args.Path)
log.Infof(ctx, "[cmdAdd]: stdinData: %v", string(args.StdinData))
result := ¤t.Result{}
ipamConf, cniVersion, err := loadIPAMConf(args.StdinData)
if err != nil {
return err
}
k8sArgs, err := loadK8SArgs(args.Args)
if err != nil {
return err
}
name, namespace := string(k8sArgs.K8S_POD_NAME), string(k8sArgs.K8S_POD_NAMESPACE)
resp, err := eniIPAM.AllocIP(ctx, k8sArgs, ipamConf)
if err != nil {
log.Errorf(ctx, "failed to allocate IP: %v", err)
return err
}
if !resp.IsSuccess {
msg := fmt.Sprintf("ipam server allocate IP error: %v", resp.ErrMsg)
log.Error(ctx, msg)
return errors.New(msg)
}
// invoke ipam del if err to avoid ip leak
defer func() {
if err != nil {
_, err := eniIPAM.ReleaseIP(ctx, k8sArgs, ipamConf)
if err != nil {
log.Errorf(ctx, "rollback: failed to delete IP for pod (%v %v): %v", namespace, name, err)
}
}
}()
var networkClient networkClient
switch resp.IPType {
case rpc.IPType_BCCMultiENIMultiIPType:
networkClient = &bccENIMultiIP{name: name, namespace: namespace, netlink: netlinkwrapper.New()}
case rpc.IPType_BBCPrimaryENIMultiIPType:
networkClient = &bbcENIMultiIP{name: name, namespace: namespace}
default:
return fmt.Errorf("unknown ipType: %v", resp.IPType)
}
err = networkClient.SetupNetwork(ctx, result, ipamConf, resp)
if err != nil {
log.Errorf(ctx, "SetupNetwork failed: %v", err)
return err
}
return types.PrintResult(result, cniVersion)
}
func cmdDel(args *skel.CmdArgs) error {
ctx := log.NewContext()
log.Infof(ctx, "====> CmdDel Begins <====")
defer log.Infof(ctx, "====> CmdDel Ends <====")
log.Infof(ctx, "[cmdDel]: containerID: %v, netns: %v, ifName: %v, args: %v, path: %v",
args.ContainerID, args.Netns, args.IfName, args.Args, args.Path)
log.Infof(ctx, "[cmdDel]: stdinData: %v", string(args.StdinData))
ipamConf, _, err := loadIPAMConf(args.StdinData)
if err != nil {
return err
}
k8sArgs, err := loadK8SArgs(args.Args)
if err != nil {
return err
}
name, namespace := string(k8sArgs.K8S_POD_NAME), string(k8sArgs.K8S_POD_NAMESPACE)
// we cannot rely on NetworkInfo to clean up rule since ipam server will gc leaked pod
if args.Netns != "" {
netutil := networkutil.New()
podIP, _ := netutil.GetIPFromPodNetNS(args.Netns, args.IfName, netlink.FAMILY_V4)
client := bccENIMultiIP{name: name, namespace: namespace, netlink: netlinkwrapper.New()}
if podIP != nil {
addrBits := 32
if podIP.To4() == nil {
addrBits = 128
}
podIPNet := &net.IPNet{IP: podIP, Mask: net.CIDRMask(addrBits, addrBits)}
_ = client.delToOrFromContainerRule(true, podIPNet)
_ = client.delToOrFromContainerRule(false, podIPNet)
log.Infof(ctx, "clean up ip rule from netns of ip %v for pod (%v %v)", podIPNet.String(), namespace, name)
}
}
resp, err := eniIPAM.ReleaseIP(ctx, k8sArgs, ipamConf)
if err != nil {
msg := fmt.Sprintf("failed to delete IP for pod (%v %v): %v", namespace, name, err)
log.Error(ctx, msg)
return errors.New(msg)
}
if !resp.IsSuccess {
msg := fmt.Sprintf("ipam server release IP error: %v", resp.ErrMsg)
log.Error(ctx, msg)
return errors.New(msg)
}
var networkClient networkClient
switch resp.IPType {
case rpc.IPType_BCCMultiENIMultiIPType:
networkClient = &bccENIMultiIP{name: name, namespace: namespace, netlink: netlinkwrapper.New()}
case rpc.IPType_BBCPrimaryENIMultiIPType:
networkClient = &bbcENIMultiIP{name: name, namespace: namespace}
default:
return fmt.Errorf("unknown ipType: %v", resp.IPType)
}
err = networkClient.TeardownNetwork(ctx, ipamConf, resp)
if err != nil {
log.Errorf(ctx, "TeardownNetwork failed: %v", err)
return err
}
return nil
}
func cmdCheck(args *skel.CmdArgs) error {
return nil
}