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k8s_vlan.go
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k8s_vlan.go
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/*
* Tencent is pleased to support the open source community by making TKEStack available.
*
* Copyright (C) 2012-2019 Tencent. All Rights Reserved.
*
* 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
*
* https://opensource.org/licenses/Apache-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 OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package main
import (
"fmt"
"net"
"runtime"
"github.com/containernetworking/cni/pkg/skel"
"github.com/containernetworking/cni/pkg/types"
t020 "github.com/containernetworking/cni/pkg/types/020"
"github.com/containernetworking/cni/pkg/version"
bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
"tkestack.io/galaxy/cni/ipam"
"tkestack.io/galaxy/pkg/network/vlan"
"tkestack.io/galaxy/pkg/utils"
)
var (
d *vlan.VlanDriver
pANet, pBNet, pCNet *net.IPNet
)
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()
_, pANet, _ = net.ParseCIDR("10.0.0.0/8")
_, pBNet, _ = net.ParseCIDR("172.16.0.0/12")
_, pCNet, _ = net.ParseCIDR("192.168.0.0/16")
}
func cmdAdd(args *skel.CmdArgs) error {
conf, err := d.LoadConf(args.StdinData)
if err != nil {
return err
}
vlanIds, results, err := ipam.Allocate(conf.IPAM.Type, args)
if err != nil {
return err
}
if d.DisableDefaultBridge == nil {
defaultTrue := true
d.DisableDefaultBridge = &defaultTrue
for i := range vlanIds {
if vlanIds[i] == 0 {
*d.DisableDefaultBridge = false
}
}
}
if err := d.Init(); err != nil {
return fmt.Errorf("failed to setup bridge %v", err)
}
result020s, err := resultConvert(results)
if err != nil {
return err
}
if err := setupNetwork(result020s, vlanIds, args); err != nil {
return err
}
result020s[0].DNS = conf.DNS
return result020s[0].Print()
}
func setupNetwork(result020s []*t020.Result, vlanIds []uint16, args *skel.CmdArgs) error {
if d.MacVlanMode() {
if err := setupMacvlan(result020s[0], vlanIds[0], args); err != nil {
return err
}
} else if d.IPVlanMode() {
if err := setupIPVlan(result020s[0], vlanIds[0], args); err != nil {
return err
}
} else {
ifName := args.IfName
if err := setupVlanDevice(result020s, vlanIds, args); err != nil {
return err
}
args.IfName = ifName
}
//send Gratuitous ARP to let switch knows IP floats onto this node
//ignore errors as we can't print logs and we do this as best as we can
if d.PureMode() {
_ = utils.SendGratuitousARP(d.Device, result020s[0].IP4.IP.IP.String(), "", d.GratuitousArpRequest)
}
return nil
}
func setupMacvlan(result *t020.Result, vlanId uint16, args *skel.CmdArgs) error {
if err := d.MaybeCreateVlanDevice(vlanId); err != nil {
return err
}
if err := utils.MacVlanConnectsHostWithContainer(result, args, d.DeviceIndex, d.MTU); err != nil {
return err
}
_ = utils.SendGratuitousARP(args.IfName, result.IP4.IP.IP.String(), args.Netns, d.GratuitousArpRequest)
return nil
}
func setupIPVlan(result *t020.Result, vlanId uint16, args *skel.CmdArgs) error {
if err := d.MaybeCreateVlanDevice(vlanId); err != nil {
return err
}
if err := utils.IPVlanConnectsHostWithContainer(result, args, d.DeviceIndex, d.GetIPVlanMode(), d.MTU); err != nil {
return err
}
if d.IpVlanMode == "l3" || d.IpVlanMode == "l3s" {
_ = utils.SendGratuitousARP(d.Device, result.IP4.IP.IP.String(), "", d.GratuitousArpRequest)
return nil
}
_ = utils.SendGratuitousARP(args.IfName, result.IP4.IP.IP.String(), args.Netns, d.GratuitousArpRequest)
return nil
}
func setupVlanDevice(result020s []*t020.Result, vlanIds []uint16, args *skel.CmdArgs) error {
ifName := args.IfName
ifIndex := 0
for i := 0; i < len(result020s); i++ {
vlanId := vlanIds[i]
result020 := result020s[i]
bridgeName, err := d.CreateBridgeAndVlanDevice(vlanId)
if err != nil {
return err
}
suffix := fmt.Sprintf("-%s%d", utils.VlanDeviceSuffix, i)
if i != 0 {
ifIndex++
args.IfName = fmt.Sprintf("eth%d", ifIndex)
if args.IfName == ifName {
ifIndex++
args.IfName = fmt.Sprintf("eth%d", ifIndex)
}
}
if err := utils.VethConnectsHostWithContainer(result020, args, bridgeName, suffix, nil); err != nil {
return err
}
_ = utils.SendGratuitousARP(args.IfName, result020s[0].IP4.IP.IP.String(), args.Netns, d.GratuitousArpRequest)
}
return nil
}
func resultConvert(results []types.Result) ([]*t020.Result, error) {
var result020s []*t020.Result
for i := 0; i < len(results); i++ {
result020, err := t020.GetResult(results[i])
if err != nil {
return nil, err
}
result020s = append(result020s, result020)
}
if len(result020s) == 2 {
routes := result020s[0].IP4.Routes
for i := 0; i < len(routes); i++ {
if routes[i].Dst.String() == "0.0.0.0/0" {
routes = append(routes[:i], routes[i+1:]...)
break
}
}
routes = append(routes, types.Route{Dst: *pANet}, types.Route{Dst: *pBNet}, types.Route{Dst: *pCNet})
result020s[0].IP4.Routes = routes
}
return result020s, nil
}
func cmdDel(args *skel.CmdArgs) error {
if err := utils.DeleteAllVeth(args.Netns); err != nil {
return err
}
conf, err := d.LoadConf(args.StdinData)
if err != nil {
return err
}
return ipam.Release(conf.IPAM.Type, args)
}
func cmdCheck(args *skel.CmdArgs) error {
return nil
}
func main() {
d = &vlan.VlanDriver{}
skel.PluginMain(cmdAdd, cmdCheck, cmdDel, version.Legacy, bv.BuildString("k8s-vlan"))
}