99 lines
2.3 KiB
Go
99 lines
2.3 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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"errors"
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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/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 cmdAdd(args *skel.CmdArgs) error {
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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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result := current.Result{}
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return result.Print()
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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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