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nm_linux.go
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nm_linux.go
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package daemon
import (
"strings"
"sync"
"github.com/kubeovn/gonetworkmanager/v2"
"github.com/scylladb/go-set/strset"
"github.com/vishvananda/netlink"
"golang.org/x/mod/semver"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog/v2"
)
type networkManagerSyncer struct {
manager gonetworkmanager.NetworkManager
workqueue workqueue.Interface
devices *strset.Set
bridgeMap map[string]string
lock sync.Mutex
}
func newNetworkManagerSyncer() *networkManagerSyncer {
syncer := &networkManagerSyncer{}
manager, err := gonetworkmanager.NewNetworkManager()
if err != nil {
klog.V(3).Infof("failed to connect to NetworkManager: %v", err)
return syncer
}
running, err := manager.Running()
if err != nil {
klog.V(3).Infof("failed to check NetworkManager running state: %v", err)
return syncer
}
if !running {
klog.V(3).Info("NetworkManager is not running, ignore")
return syncer
}
syncer.manager = manager
syncer.workqueue = workqueue.NewNamed("NetworkManagerSyncer")
syncer.devices = strset.New()
syncer.bridgeMap = make(map[string]string)
return syncer
}
func (n *networkManagerSyncer) Run(handler func(nic, bridge string, delNonExistent bool) (int, error)) {
if n.manager == nil {
return
}
go func() {
for n.ProcessNextItem(handler) {
}
}()
go func() {
ch := n.manager.Subscribe()
defer n.manager.Unsubscribe()
suffix := "." + gonetworkmanager.ActiveConnectionSignalStateChanged
for {
event := <-ch
if len(event.Body) == 0 || !strings.HasSuffix(event.Name, suffix) {
continue
}
state, ok := event.Body[0].(uint32)
if !ok {
klog.Warningf("failed to convert %#v to uint32", event.Body[0])
continue
}
if gonetworkmanager.NmDeviceState(state) != gonetworkmanager.NmDeviceStateActivated {
continue
}
devices, err := n.manager.GetDevices()
if err != nil {
klog.Errorf("failed to get NetworkManager devices: %v", err)
continue
}
var device gonetworkmanager.Device
for _, dev := range devices {
if dev.GetPath() == event.Path {
device = dev
break
}
}
if device == nil {
klog.Warningf("NetworkManager device %s not found", event.Path)
continue
}
name, err := device.GetPropertyIpInterface()
if err != nil {
klog.Errorf("failed to get IP interface of device %s: %v", device.GetPath(), err)
continue
}
n.lock.Lock()
if !n.devices.Has(name) {
n.lock.Unlock()
continue
}
n.lock.Unlock()
klog.Infof("adding device %s to workqueue", name)
n.workqueue.Add(name)
}
}()
}
func (n *networkManagerSyncer) ProcessNextItem(handler func(nic, bridge string, delNonExistent bool) (int, error)) bool {
item, shutdown := n.workqueue.Get()
if shutdown {
return false
}
defer n.workqueue.Done(item)
klog.Infof("process device %v", item)
nic := item.(string)
var bridge string
n.lock.Lock()
if !n.devices.Has(nic) {
n.lock.Unlock()
return true
}
bridge = n.bridgeMap[nic]
n.lock.Unlock()
if _, err := handler(nic, bridge, true); err != nil {
klog.Errorf("failed to handle NetworkManager event for device %s with bridge %s: %v", nic, bridge, err)
}
return true
}
func (n *networkManagerSyncer) AddDevice(nicName, bridge string) error {
if n.manager == nil {
return nil
}
n.lock.Lock()
klog.V(3).Infof("adding device %s with bridge %s", nicName, bridge)
n.devices.Add(nicName)
n.bridgeMap[nicName] = bridge
n.lock.Unlock()
return nil
}
func (n *networkManagerSyncer) RemoveDevice(nicName string) error {
if n.manager == nil {
return nil
}
n.lock.Lock()
n.devices.Remove(nicName)
delete(n.bridgeMap, nicName)
n.lock.Unlock()
return nil
}
func (n *networkManagerSyncer) SetManaged(name string, managed bool) error {
if n.manager == nil {
return nil
}
link, err := netlink.LinkByName(name)
if err != nil {
klog.Errorf("failed to get link %q: %v", name, err)
return err
}
device, err := n.manager.GetDeviceByIpIface(name)
if err != nil {
klog.Errorf("failed to get device by IP iface %q: %v", name, err)
return err
}
current, err := device.GetPropertyManaged()
if err != nil {
klog.Errorf("failed to get device property managed: %v", err)
return err
}
if current == managed {
return nil
}
if !managed {
links, err := netlink.LinkList()
if err != nil {
klog.Errorf("failed to list network links: %v", err)
return err
}
for _, l := range links {
if l.Attrs().ParentIndex != link.Attrs().Index || l.Type() != "vlan" {
continue
}
d, err := n.manager.GetDeviceByIpIface(l.Attrs().Name)
if err != nil {
klog.Errorf("failed to get device by IP iface %q: %v", l.Attrs().Name, err)
return err
}
vlanManaged, err := d.GetPropertyManaged()
if err != nil {
klog.Errorf("failed to get property managed of device %s: %v", l.Attrs().Name, err)
continue
}
if vlanManaged {
// After setting device managed=no, the vlan interface will be set down by NetworkManager.
klog.Infof(`device %q has a vlan interface %q mannaged by NetworkManager, will not set the NetworkManager property "managed" to %v`, name, l.Attrs().Name, managed)
return nil
}
}
version, err := n.manager.GetPropertyVersion()
if err != nil {
klog.Errorf("failed to get NetworkManager version: %v", err)
return err
}
if !strings.HasPrefix(version, "v") {
version = "v" + version
}
// Retrieving DNS configuration requires NetworkManager >= v1.6.0.
// Do not set device managed=no if the version is < v1.6.0.
if semver.Compare(version, "v1.6.0") < 0 {
klog.Infof("NetworkManager version %s is less than v1.6.0")
return nil
}
// requires NetworkManager >= v1.6
dnsManager, err := gonetworkmanager.NewDnsManager()
if err != nil {
klog.Errorf("failed to initialize NetworkManager DNS manager: %v", err)
return err
}
configurations, err := dnsManager.GetPropertyConfiguration()
if err != nil {
klog.Errorf("failed to get NetworkManager DNS configuration: %v", err)
return err
}
for _, c := range configurations {
if c.Interface == name {
if len(c.Nameservers) != 0 {
// After setting device managed=no on CentOS 7 with NetworkManager v1.18.x,
// the DNS servers in /etc/resolv.conf configured on the device will be removed.
// We don't want to change the host DNS configuration, so skip this operation.
klog.Infof("DNS servers %s are configured on interface %s", strings.Join(c.Nameservers, ","), name)
if semver.MajorMinor(version) == "v1.18" {
klog.Infof("NetworkManager's version is v1.18.x")
return nil
}
}
break
}
}
}
klog.Infof(`setting device %s NetworkManager property "managed" to %v`, name, managed)
if err = device.SetPropertyManaged(managed); err != nil {
klog.Errorf("failed to set device property managed to %v: %v", managed, err)
return err
}
return nil
}