133 lines
3.2 KiB
Go
133 lines
3.2 KiB
Go
// Copyright 2016 CNI authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"encoding/json"
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"errors"
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"fmt"
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"net"
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"github.com/vishvananda/netlink"
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"github.com/containernetworking/cni/pkg/skel"
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"github.com/containernetworking/cni/pkg/types"
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"github.com/containernetworking/cni/pkg/types/current"
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"github.com/containernetworking/cni/pkg/version"
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"github.com/containernetworking/plugins/pkg/ns"
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bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
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)
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func parseNetConf(bytes []byte) (*types.NetConf, error) {
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conf := &types.NetConf{}
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if err := json.Unmarshal(bytes, conf); err != nil {
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return nil, fmt.Errorf("failed to parse network config: %v", err)
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}
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if conf.RawPrevResult != nil {
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if err := version.ParsePrevResult(conf); err != nil {
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return nil, fmt.Errorf("failed to parse prevResult: %v", err)
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}
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if _, err := current.NewResultFromResult(conf.PrevResult); err != nil {
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return nil, fmt.Errorf("failed to convert result to current version: %v", err)
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}
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}
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return conf, nil
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}
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func cmdAdd(args *skel.CmdArgs) error {
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conf, err := parseNetConf(args.StdinData)
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if err != nil {
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return err
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}
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args.IfName = "lo" // ignore config, this only works for loopback
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err = ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
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link, err := netlink.LinkByName(args.IfName)
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if err != nil {
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return err // not tested
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}
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err = netlink.LinkSetUp(link)
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if err != nil {
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return err // not tested
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}
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return nil
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})
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if err != nil {
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return err // not tested
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}
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var result types.Result
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if conf.PrevResult != nil {
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// If loopback has previous result which passes from previous CNI plugin,
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// loopback should pass it transparently
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result = conf.PrevResult
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} else {
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result = ¤t.Result{}
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}
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return types.PrintResult(result, conf.CNIVersion)
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}
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func cmdDel(args *skel.CmdArgs) error {
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if args.Netns == "" {
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return nil
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}
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args.IfName = "lo" // ignore config, this only works for loopback
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err := ns.WithNetNSPath(args.Netns, func(ns.NetNS) error {
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link, err := netlink.LinkByName(args.IfName)
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if err != nil {
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return err // not tested
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}
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err = netlink.LinkSetDown(link)
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if err != nil {
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return err // not tested
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}
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return nil
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})
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if err != nil {
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return err // not tested
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}
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return nil
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}
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func main() {
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skel.PluginMain(cmdAdd, cmdCheck, cmdDel, version.All, bv.BuildString("loopback"))
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}
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func cmdCheck(args *skel.CmdArgs) error {
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args.IfName = "lo" // ignore config, this only works for loopback
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return ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
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link, err := netlink.LinkByName(args.IfName)
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if err != nil {
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return err
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}
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if link.Attrs().Flags&net.FlagUp != net.FlagUp {
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return errors.New("loopback interface is down")
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}
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return nil
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})
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}
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