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// Copyright 2015 CNI authors
//
// 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 (
"encoding/json"
"errors"
"fmt"
"runtime"
"github.com/vishvananda/netlink"
"github.com/containernetworking/cni/pkg/skel"
"github.com/containernetworking/cni/pkg/types"
current "github.com/containernetworking/cni/pkg/types/100"
"github.com/containernetworking/cni/pkg/version"
"github.com/containernetworking/plugins/pkg/ip"
"github.com/containernetworking/plugins/pkg/ipam"
"github.com/containernetworking/plugins/pkg/ns"
bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
)
type NetConf struct {
types.NetConf
Master string `json:"master"`
VlanId int `json:"vlanId"`
MTU int `json:"mtu,omitempty"`
}
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()
}
func loadConf(bytes []byte) (*NetConf, string, error) {
n := &NetConf{}
if err := json.Unmarshal(bytes, n); err != nil {
return nil, "", fmt.Errorf("failed to load netconf: %v", err)
}
if n.Master == "" {
return nil, "", fmt.Errorf("\"master\" field is required. It specifies the host interface name to create the VLAN for.")
}
if n.VlanId < 0 || n.VlanId > 4094 {
return nil, "", fmt.Errorf("invalid VLAN ID %d (must be between 0 and 4095 inclusive)", n.VlanId)
}
// check existing and MTU of master interface
masterMTU, err := getMTUByName(n.Master)
if err != nil {
return nil, "", err
}
if n.MTU < 0 || n.MTU > masterMTU {
return nil, "", fmt.Errorf("invalid MTU %d, must be [0, master MTU(%d)]", n.MTU, masterMTU)
}
return n, n.CNIVersion, nil
}
func getMTUByName(ifName string) (int, error) {
link, err := netlink.LinkByName(ifName)
if err != nil {
return 0, err
}
return link.Attrs().MTU, nil
}
func createVlan(conf *NetConf, ifName string, netns ns.NetNS) (*current.Interface, error) {
vlan := ¤t.Interface{}
m, err := netlink.LinkByName(conf.Master)
if err != nil {
return nil, fmt.Errorf("failed to lookup master %q: %v", conf.Master, err)
}
// due to kernel bug we have to create with tmpname or it might
// collide with the name on the host and error out
tmpName, err := ip.RandomVethName()
if err != nil {
return nil, err
}
v := &netlink.Vlan{
LinkAttrs: netlink.LinkAttrs{
MTU: conf.MTU,
Name: tmpName,
ParentIndex: m.Attrs().Index,
Namespace: netlink.NsFd(int(netns.Fd())),
},
VlanId: conf.VlanId,
}
if err := netlink.LinkAdd(v); err != nil {
return nil, fmt.Errorf("failed to create vlan: %v", err)
}
err = netns.Do(func(_ ns.NetNS) error {
err := ip.RenameLink(tmpName, ifName)
if err != nil {
return fmt.Errorf("failed to rename vlan to %q: %v", ifName, err)
}
vlan.Name = ifName
// Re-fetch interface to get all properties/attributes
contVlan, err := netlink.LinkByName(vlan.Name)
if err != nil {
return fmt.Errorf("failed to refetch vlan %q: %v", vlan.Name, err)
}
vlan.Mac = contVlan.Attrs().HardwareAddr.String()
vlan.Sandbox = netns.Path()
return nil
})
if err != nil {
return nil, err
}
return vlan, nil
}
func cmdAdd(args *skel.CmdArgs) error {
n, cniVersion, err := loadConf(args.StdinData)
if err != nil {
return err
}
netns, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
}
defer netns.Close()
vlanInterface, err := createVlan(n, args.IfName, netns)
if err != nil {
return err
}
// run the IPAM plugin and get back the config to apply
r, err := ipam.ExecAdd(n.IPAM.Type, args.StdinData)
if err != nil {
return fmt.Errorf("failed to execute IPAM delegate: %v", err)
}
// Invoke ipam del if err to avoid ip leak
defer func() {
if err != nil {
ipam.ExecDel(n.IPAM.Type, args.StdinData)
}
}()
// Convert whatever the IPAM result was into the current Result type
result, err := current.NewResultFromResult(r)
if err != nil {
return err
}
if len(result.IPs) == 0 {
return errors.New("IPAM plugin returned missing IP config")
}
for _, ipc := range result.IPs {
// All addresses belong to the vlan interface
ipc.Interface = current.Int(0)
}
result.Interfaces = []*current.Interface{vlanInterface}
err = netns.Do(func(_ ns.NetNS) error {
return ipam.ConfigureIface(args.IfName, result)
})
if err != nil {
return err
}
result.DNS = n.DNS
return types.PrintResult(result, cniVersion)
}
func cmdDel(args *skel.CmdArgs) error {
n, _, err := loadConf(args.StdinData)
if err != nil {
return err
}
err = ipam.ExecDel(n.IPAM.Type, args.StdinData)
if err != nil {
return err
}
if args.Netns == "" {
return nil
}
err = ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
err = ip.DelLinkByName(args.IfName)
if err != nil && err == ip.ErrLinkNotFound {
return nil
}
return err
})
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 {
return nil
}
return err
}
return err
}
func main() {
skel.PluginMain(cmdAdd, cmdCheck, cmdDel, version.All, bv.BuildString("vlan"))
}
func cmdCheck(args *skel.CmdArgs) error {
conf := NetConf{}
if err := json.Unmarshal(args.StdinData, &conf); err != nil {
return fmt.Errorf("failed to load netconf: %v", err)
}
netns, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
}
defer netns.Close()
// run the IPAM plugin and get back the config to apply
err = ipam.ExecCheck(conf.IPAM.Type, args.StdinData)
if err != nil {
return err
}
if conf.NetConf.RawPrevResult == nil {
return fmt.Errorf("vlan: Required prevResult missing")
}
if err := version.ParsePrevResult(&conf.NetConf); err != nil {
return err
}
// Convert whatever the IPAM result was into the current Result type
result, err := current.NewResultFromResult(conf.PrevResult)
if err != nil {
return err
}
var contMap current.Interface
// Find interfaces for name whe know, that of host-device inside container
for _, intf := range result.Interfaces {
if args.IfName == intf.Name {
if args.Netns == intf.Sandbox {
contMap = *intf
continue
}
}
}
// The namespace must be the same as what was configured
if args.Netns != contMap.Sandbox {
return fmt.Errorf("Sandbox in prevResult %s doesn't match configured netns: %s",
contMap.Sandbox, args.Netns)
}
m, err := netlink.LinkByName(conf.Master)
if err != nil {
return fmt.Errorf("failed to lookup master %q: %v", conf.Master, err)
}
//
// Check prevResults for ips, routes and dns against values found in the container
if err := netns.Do(func(_ ns.NetNS) error {
// Check interface against values found in the container
err := validateCniContainerInterface(contMap, m.Attrs().Index, conf.VlanId, conf.MTU)
if err != nil {
return err
}
err = ip.ValidateExpectedInterfaceIPs(args.IfName, result.IPs)
if err != nil {
return err
}
err = ip.ValidateExpectedRoute(result.Routes)
if err != nil {
return err
}
return nil
}); err != nil {
return err
}
return nil
}
func validateCniContainerInterface(intf current.Interface, masterIndex int, vlanId int, mtu int) error {
var link netlink.Link
var err error
if intf.Name == "" {
return fmt.Errorf("Container interface name missing in prevResult: %v", intf.Name)
}
link, err = netlink.LinkByName(intf.Name)
if err != nil {
return fmt.Errorf("vlan: Container Interface name in prevResult: %s not found", intf.Name)
}
if intf.Sandbox == "" {
return fmt.Errorf("vlan: Error: Container interface %s should not be in host namespace", link.Attrs().Name)
}
vlan, isVlan := link.(*netlink.Vlan)
if !isVlan {
return fmt.Errorf("Error: Container interface %s not of type vlan", link.Attrs().Name)
}
// TODO This works when unit testing via cnitool; fails with ./test.sh
//if masterIndex != vlan.Attrs().ParentIndex {
// return fmt.Errorf("Container vlan Master %d does not match expected value: %d", vlan.Attrs().ParentIndex, masterIndex)
//}
if intf.Mac != "" {
if intf.Mac != link.Attrs().HardwareAddr.String() {
return fmt.Errorf("vlan: Interface %s Mac %s doesn't match container Mac: %s", intf.Name, intf.Mac, link.Attrs().HardwareAddr)
}
}
if vlanId != vlan.VlanId {
return fmt.Errorf("Error: Tuning link %s configured promisc is %v, current value is %d",
intf.Name, vlanId, vlan.VlanId)
}
if mtu != 0 {
if mtu != link.Attrs().MTU {
return fmt.Errorf("Error: Tuning configured MTU of %s is %d, current value is %d",
intf.Name, mtu, link.Attrs().MTU)
}
}
return nil
}
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