forked from containernetworking/plugins
/
macvlan.go
564 lines (485 loc) · 13.4 KB
/
macvlan.go
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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"
"net"
"runtime"
"github.com/vishvananda/netlink"
"github.com/TechXTeam/cni/pkg/skel"
"github.com/TechXTeam/cni/pkg/types"
current "github.com/TechXTeam/cni/pkg/types/100"
"github.com/TechXTeam/cni/pkg/version"
"github.com/TechXTeam/plugins/pkg/ip"
"github.com/TechXTeam/plugins/pkg/ipam"
"github.com/TechXTeam/plugins/pkg/ns"
bv "github.com/TechXTeam/plugins/pkg/utils/buildversion"
"github.com/TechXTeam/plugins/pkg/utils/sysctl"
)
type NetConf struct {
types.NetConf
Master string `json:"master"`
Mode string `json:"mode"`
MTU int `json:"mtu"`
Mac string `json:"mac,omitempty"`
LinkContNs bool `json:"linkInContainer,omitempty"`
RuntimeConfig struct {
Mac string `json:"mac,omitempty"`
} `json:"runtimeConfig,omitempty"`
}
// MacEnvArgs represents CNI_ARG
type MacEnvArgs struct {
types.CommonArgs
MAC types.UnmarshallableString `json:"mac,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 getDefaultRouteInterfaceName() (string, error) {
routeToDstIP, err := netlink.RouteList(nil, netlink.FAMILY_ALL)
if err != nil {
return "", err
}
for _, v := range routeToDstIP {
if v.Dst == nil {
l, err := netlink.LinkByIndex(v.LinkIndex)
if err != nil {
return "", err
}
return l.Attrs().Name, nil
}
}
return "", fmt.Errorf("no default route interface found")
}
func getNamespacedDefaultRouteInterfaceName(namespace string, inContainer bool) (string, error) {
if !inContainer {
return getDefaultRouteInterfaceName()
}
netns, err := ns.GetNS(namespace)
if err != nil {
return "", fmt.Errorf("failed to open netns %q: %v", netns, err)
}
defer netns.Close()
var defaultRouteInterface string
err = netns.Do(func(_ ns.NetNS) error {
defaultRouteInterface, err = getDefaultRouteInterfaceName()
if err != nil {
return err
}
return nil
})
if err != nil {
return "", err
}
return defaultRouteInterface, nil
}
func loadConf(args *skel.CmdArgs, envArgs string) (*NetConf, string, error) {
n := &NetConf{}
if err := json.Unmarshal(args.StdinData, n); err != nil {
return nil, "", fmt.Errorf("failed to load netconf: %v", err)
}
if n.Master == "" {
defaultRouteInterface, err := getNamespacedDefaultRouteInterfaceName(args.Netns, n.LinkContNs)
if err != nil {
return nil, "", err
}
n.Master = defaultRouteInterface
}
// check existing and MTU of master interface
masterMTU, err := getMTUByName(n.Master, args.Netns, n.LinkContNs)
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)
}
if envArgs != "" {
e := MacEnvArgs{}
err := types.LoadArgs(envArgs, &e)
if err != nil {
return nil, "", err
}
if e.MAC != "" {
n.Mac = string(e.MAC)
}
}
if n.RuntimeConfig.Mac != "" {
n.Mac = n.RuntimeConfig.Mac
}
return n, n.CNIVersion, nil
}
func getMTUByName(ifName string, namespace string, inContainer bool) (int, error) {
var link netlink.Link
var err error
if inContainer {
var netns ns.NetNS
netns, err = ns.GetNS(namespace)
if err != nil {
return 0, fmt.Errorf("failed to open netns %q: %v", netns, err)
}
defer netns.Close()
err = netns.Do(func(_ ns.NetNS) error {
link, err = netlink.LinkByName(ifName)
return err
})
} else {
link, err = netlink.LinkByName(ifName)
}
if err != nil {
return 0, err
}
return link.Attrs().MTU, nil
}
func modeFromString(s string) (netlink.MacvlanMode, error) {
switch s {
case "", "bridge":
return netlink.MACVLAN_MODE_BRIDGE, nil
case "private":
return netlink.MACVLAN_MODE_PRIVATE, nil
case "vepa":
return netlink.MACVLAN_MODE_VEPA, nil
case "passthru":
return netlink.MACVLAN_MODE_PASSTHRU, nil
default:
return 0, fmt.Errorf("unknown macvlan mode: %q", s)
}
}
func modeToString(mode netlink.MacvlanMode) (string, error) {
switch mode {
case netlink.MACVLAN_MODE_BRIDGE:
return "bridge", nil
case netlink.MACVLAN_MODE_PRIVATE:
return "private", nil
case netlink.MACVLAN_MODE_VEPA:
return "vepa", nil
case netlink.MACVLAN_MODE_PASSTHRU:
return "passthru", nil
default:
return "", fmt.Errorf("unknown macvlan mode: %q", mode)
}
}
func createMacvlan(conf *NetConf, ifName string, netns ns.NetNS) (*current.Interface, error) {
macvlan := ¤t.Interface{}
mode, err := modeFromString(conf.Mode)
if err != nil {
return nil, err
}
var m netlink.Link
if conf.LinkContNs {
err = netns.Do(func(_ ns.NetNS) error {
m, err = netlink.LinkByName(conf.Master)
return err
})
} else {
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
}
linkAttrs := netlink.LinkAttrs{
MTU: conf.MTU,
Name: tmpName,
ParentIndex: m.Attrs().Index,
Namespace: netlink.NsFd(int(netns.Fd())),
}
if conf.Mac != "" {
addr, err := net.ParseMAC(conf.Mac)
if err != nil {
return nil, fmt.Errorf("invalid args %v for MAC addr: %v", conf.Mac, err)
}
linkAttrs.HardwareAddr = addr
}
mv := &netlink.Macvlan{
LinkAttrs: linkAttrs,
Mode: mode,
}
if conf.LinkContNs {
err = netns.Do(func(_ ns.NetNS) error {
return netlink.LinkAdd(mv)
})
} else {
if err = netlink.LinkAdd(mv); err != nil {
return nil, fmt.Errorf("failed to create macvlan: %v", err)
}
}
if err != nil {
return nil, fmt.Errorf("failed to create macvlan: %v", err)
}
err = netns.Do(func(_ ns.NetNS) error {
err := ip.RenameLink(tmpName, ifName)
if err != nil {
_ = netlink.LinkDel(mv)
return fmt.Errorf("failed to rename macvlan to %q: %v", ifName, err)
}
macvlan.Name = ifName
// Re-fetch macvlan to get all properties/attributes
contMacvlan, err := netlink.LinkByName(ifName)
if err != nil {
return fmt.Errorf("failed to refetch macvlan %q: %v", ifName, err)
}
macvlan.Mac = contMacvlan.Attrs().HardwareAddr.String()
macvlan.Sandbox = netns.Path()
return nil
})
if err != nil {
return nil, err
}
return macvlan, nil
}
func cmdAdd(args *skel.CmdArgs) error {
n, cniVersion, err := loadConf(args, args.Args)
if err != nil {
return err
}
isLayer3 := n.IPAM.Type != ""
netns, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", netns, err)
}
defer netns.Close()
macvlanInterface, err := createMacvlan(n, args.IfName, netns)
if err != nil {
return err
}
// Delete link if err to avoid link leak in this ns
defer func() {
if err != nil {
netns.Do(func(_ ns.NetNS) error {
return ip.DelLinkByName(args.IfName)
})
}
}()
// Assume L2 interface only
result := ¤t.Result{
CNIVersion: current.ImplementedSpecVersion,
Interfaces: []*current.Interface{macvlanInterface},
}
if isLayer3 {
// run the IPAM plugin and get back the config to apply
r, err := ipam.ExecAdd(n.IPAM.Type, args.StdinData)
if err != nil {
return 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
ipamResult, err := current.NewResultFromResult(r)
if err != nil {
return err
}
if len(ipamResult.IPs) == 0 {
return errors.New("IPAM plugin returned missing IP config")
}
result.IPs = ipamResult.IPs
result.Routes = ipamResult.Routes
for _, ipc := range result.IPs {
// All addresses apply to the container macvlan interface
ipc.Interface = current.Int(0)
}
err = netns.Do(func(_ ns.NetNS) error {
_, _ = sysctl.Sysctl(fmt.Sprintf("net/ipv4/conf/%s/arp_notify", args.IfName), "1")
return ipam.ConfigureIface(args.IfName, result)
})
if err != nil {
return err
}
} else {
// For L2 just change interface status to up
err = netns.Do(func(_ ns.NetNS) error {
macvlanInterfaceLink, err := netlink.LinkByName(args.IfName)
if err != nil {
return fmt.Errorf("failed to find interface name %q: %v", macvlanInterface.Name, err)
}
if err := netlink.LinkSetUp(macvlanInterfaceLink); err != nil {
return fmt.Errorf("failed to set %q UP: %v", args.IfName, err)
}
return nil
})
if err != nil {
return err
}
}
result.DNS = n.DNS
return types.PrintResult(result, cniVersion)
}
func cmdDel(args *skel.CmdArgs) error {
n, _, err := loadConf(args, args.Args)
if err != nil {
return err
}
isLayer3 := n.IPAM.Type != ""
if isLayer3 {
err = ipam.ExecDel(n.IPAM.Type, args.StdinData)
if err != nil {
return err
}
}
if args.Netns == "" {
return nil
}
// There is a netns so try to clean up. Delete can be called multiple times
// so don't return an error if the device is already removed.
err = ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
if err := ip.DelLinkByName(args.IfName); err != nil {
if err != ip.ErrLinkNotFound {
return err
}
}
return nil
})
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("macvlan"))
}
func cmdCheck(args *skel.CmdArgs) error {
n, _, err := loadConf(args, args.Args)
if err != nil {
return err
}
isLayer3 := n.IPAM.Type != ""
netns, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
}
defer netns.Close()
if isLayer3 {
// run the IPAM plugin and get back the config to apply
err = ipam.ExecCheck(n.IPAM.Type, args.StdinData)
if err != nil {
return err
}
}
// Parse previous result.
if n.NetConf.RawPrevResult == nil {
return fmt.Errorf("required prevResult missing")
}
if err := version.ParsePrevResult(&n.NetConf); err != nil {
return err
}
result, err := current.NewResultFromResult(n.PrevResult)
if err != nil {
return err
}
var contMap current.Interface
// Find interfaces for names whe know, macvlan device name 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)
}
if n.LinkContNs {
err = netns.Do(func(_ ns.NetNS) error {
_, err = netlink.LinkByName(n.Master)
return err
})
} else {
_, err = netlink.LinkByName(n.Master)
}
if err != nil {
return fmt.Errorf("failed to lookup master %q: %v", n.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, n.Mode)
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, modeExpected string) 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("container Interface name in prevResult: %s not found", intf.Name)
}
if intf.Sandbox == "" {
return fmt.Errorf("error: Container interface %s should not be in host namespace", link.Attrs().Name)
}
macv, isMacvlan := link.(*netlink.Macvlan)
if !isMacvlan {
return fmt.Errorf("error: Container interface %s not of type macvlan", link.Attrs().Name)
}
mode, err := modeFromString(modeExpected)
if err != nil {
return err
}
if macv.Mode != mode {
currString, err := modeToString(macv.Mode)
if err != nil {
return err
}
confString, err := modeToString(mode)
if err != nil {
return err
}
return fmt.Errorf("container macvlan mode %s does not match expected value: %s", currString, confString)
}
if intf.Mac != "" {
if intf.Mac != link.Attrs().HardwareAddr.String() {
return fmt.Errorf("interface %s Mac %s doesn't match container Mac: %s", intf.Name, intf.Mac, link.Attrs().HardwareAddr)
}
}
return nil
}