d5acb127b8
Updates the spec and plugins to return an array of interfaces and IP details to the runtime including: - interface names and MAC addresses configured by the plugin - whether the interfaces are sandboxed (container/VM) or host (bridge, veth, etc) - multiple IP addresses configured by IPAM and which interface they have been assigned to Returning interface details is useful for runtimes, as well as allowing more flexible chaining of CNI plugins themselves. For example, some meta plugins may need to know the host-side interface to be able to apply firewall or traffic shaping rules to the container.
85 lines
2.5 KiB
Go
85 lines
2.5 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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// This is a "meta-plugin". It reads in its own netconf, it does not create
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// any network interface but just changes the network sysctl.
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package main
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"path/filepath"
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"strings"
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"github.com/containernetworking/cni/pkg/ns"
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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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)
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// TuningConf represents the network tuning configuration.
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type TuningConf struct {
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types.NetConf
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SysCtl map[string]string `json:"sysctl"`
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}
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func cmdAdd(args *skel.CmdArgs) error {
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tuningConf := TuningConf{}
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if err := json.Unmarshal(args.StdinData, &tuningConf); err != nil {
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return fmt.Errorf("failed to load netconf: %v", err)
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}
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// The directory /proc/sys/net is per network namespace. Enter in the
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// network namespace before writing on it.
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err := ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
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for key, value := range tuningConf.SysCtl {
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fileName := filepath.Join("/proc/sys", strings.Replace(key, ".", "/", -1))
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fileName = filepath.Clean(fileName)
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// Refuse to modify sysctl parameters that don't belong
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// to the network subsystem.
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if !strings.HasPrefix(fileName, "/proc/sys/net/") {
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return fmt.Errorf("invalid net sysctl key: %q", key)
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}
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content := []byte(value)
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err := ioutil.WriteFile(fileName, content, 0644)
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if err != nil {
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return err
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}
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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
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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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// TODO: the settings are not reverted to the previous values. Reverting the
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// settings is not useful when the whole container goes away but it could be
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// useful in scenarios where plugins are added and removed at runtime.
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return nil
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}
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func main() {
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skel.PluginMain(cmdAdd, cmdDel, version.All)
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}
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