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vnids_master.go
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vnids_master.go
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package plugin
import (
"fmt"
"sync"
log "github.com/golang/glog"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
utilwait "k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/tools/cache"
kapi "k8s.io/kubernetes/pkg/api"
osclient "github.com/openshift/origin/pkg/client"
osapi "github.com/openshift/origin/pkg/sdn/api"
pnetid "github.com/openshift/origin/pkg/sdn/plugin/netid"
)
type masterVNIDMap struct {
// Synchronizes assign, revoke and update VNID
lock sync.Mutex
ids map[string]uint32
netIDManager *pnetid.Allocator
adminNamespaces sets.String
allowRenumbering bool
}
func newMasterVNIDMap(allowRenumbering bool) *masterVNIDMap {
netIDRange, err := pnetid.NewNetIDRange(osapi.MinVNID, osapi.MaxVNID)
if err != nil {
panic(err)
}
return &masterVNIDMap{
netIDManager: pnetid.NewInMemory(netIDRange),
adminNamespaces: sets.NewString(metav1.NamespaceDefault),
ids: make(map[string]uint32),
allowRenumbering: allowRenumbering,
}
}
func (vmap *masterVNIDMap) getVNID(name string) (uint32, bool) {
id, found := vmap.ids[name]
return id, found
}
func (vmap *masterVNIDMap) setVNID(name string, id uint32) {
vmap.ids[name] = id
}
func (vmap *masterVNIDMap) unsetVNID(name string) (uint32, bool) {
id, found := vmap.ids[name]
delete(vmap.ids, name)
return id, found
}
func (vmap *masterVNIDMap) getVNIDCount(id uint32) int {
count := 0
for _, netid := range vmap.ids {
if id == netid {
count = count + 1
}
}
return count
}
func (vmap *masterVNIDMap) isAdminNamespace(nsName string) bool {
if vmap.adminNamespaces.Has(nsName) {
return true
}
return false
}
func (vmap *masterVNIDMap) populateVNIDs(osClient *osclient.Client) error {
netnsList, err := osClient.NetNamespaces().List(metav1.ListOptions{})
if err != nil {
return err
}
for _, netns := range netnsList.Items {
vmap.setVNID(netns.NetName, netns.NetID)
// Skip GlobalVNID, not part of netID allocation range
if netns.NetID == osapi.GlobalVNID {
continue
}
switch err := vmap.netIDManager.Allocate(netns.NetID); err {
case nil: // Expected normal case
case pnetid.ErrAllocated: // Expected when project networks are joined
default:
return fmt.Errorf("unable to allocate netid %d: %v", netns.NetID, err)
}
}
return nil
}
func (vmap *masterVNIDMap) allocateNetID(nsName string) (uint32, bool, error) {
// Nothing to do if the netid is in the vnid map
exists := false
if netid, found := vmap.getVNID(nsName); found {
exists = true
return netid, exists, nil
}
// NetNamespace not found, so allocate new NetID
var netid uint32
if vmap.isAdminNamespace(nsName) {
netid = osapi.GlobalVNID
} else {
var err error
netid, err = vmap.netIDManager.AllocateNext()
if err != nil {
return 0, exists, err
}
}
vmap.setVNID(nsName, netid)
log.Infof("Allocated netid %d for namespace %q", netid, nsName)
return netid, exists, nil
}
func (vmap *masterVNIDMap) releaseNetID(nsName string) error {
// Remove NetID from vnid map
netid, found := vmap.unsetVNID(nsName)
if !found {
return fmt.Errorf("netid not found for namespace %q", nsName)
}
// Skip osapi.GlobalVNID as it is not part of NetID allocation
if netid == osapi.GlobalVNID {
return nil
}
// Check if this netid is used by any other namespaces
// If not, then release the netid
if count := vmap.getVNIDCount(netid); count == 0 {
if err := vmap.netIDManager.Release(netid); err != nil {
return fmt.Errorf("Error while releasing netid %d for namespace %q, %v", netid, nsName, err)
}
log.Infof("Released netid %d for namespace %q", netid, nsName)
} else {
log.V(5).Infof("netid %d for namespace %q is still in use", netid, nsName)
}
return nil
}
func (vmap *masterVNIDMap) updateNetID(nsName string, action osapi.PodNetworkAction, args string) (uint32, error) {
var netid uint32
allocated := false
// Check if the given namespace exists or not
oldnetid, found := vmap.getVNID(nsName)
if !found {
return 0, fmt.Errorf("netid not found for namespace %q", nsName)
}
// Determine new network ID
switch action {
case osapi.GlobalPodNetwork:
netid = osapi.GlobalVNID
case osapi.JoinPodNetwork:
joinNsName := args
var found bool
if netid, found = vmap.getVNID(joinNsName); !found {
return 0, fmt.Errorf("netid not found for namespace %q", joinNsName)
}
case osapi.IsolatePodNetwork:
// Check if the given namespace is already isolated
if count := vmap.getVNIDCount(oldnetid); count == 1 {
return oldnetid, nil
}
var err error
netid, err = vmap.netIDManager.AllocateNext()
if err != nil {
return 0, err
}
allocated = true
default:
return 0, fmt.Errorf("invalid pod network action: %v", action)
}
// Release old network ID
if err := vmap.releaseNetID(nsName); err != nil {
if allocated {
vmap.netIDManager.Release(netid)
}
return 0, err
}
// Set new network ID
vmap.setVNID(nsName, netid)
log.Infof("Updated netid %d for namespace %q", netid, nsName)
return netid, nil
}
// assignVNID, revokeVNID and updateVNID methods updates in-memory structs and persists etcd objects
func (vmap *masterVNIDMap) assignVNID(osClient *osclient.Client, nsName string) error {
vmap.lock.Lock()
defer vmap.lock.Unlock()
netid, exists, err := vmap.allocateNetID(nsName)
if err != nil {
return err
}
if !exists {
// Create NetNamespace Object and update vnid map
netns := &osapi.NetNamespace{
TypeMeta: metav1.TypeMeta{Kind: "NetNamespace"},
ObjectMeta: metav1.ObjectMeta{Name: nsName},
NetName: nsName,
NetID: netid,
}
_, err := osClient.NetNamespaces().Create(netns)
if err != nil {
vmap.releaseNetID(nsName)
return err
}
}
return nil
}
func (vmap *masterVNIDMap) revokeVNID(osClient *osclient.Client, nsName string) error {
vmap.lock.Lock()
defer vmap.lock.Unlock()
// Delete NetNamespace object
if err := osClient.NetNamespaces().Delete(nsName); err != nil {
return err
}
if err := vmap.releaseNetID(nsName); err != nil {
return err
}
return nil
}
func (vmap *masterVNIDMap) updateVNID(osClient *osclient.Client, netns *osapi.NetNamespace) error {
action, args, err := osapi.GetChangePodNetworkAnnotation(netns)
if err == osapi.ErrorPodNetworkAnnotationNotFound {
// Nothing to update
return nil
} else if !vmap.allowRenumbering {
osapi.DeleteChangePodNetworkAnnotation(netns)
_, _ = osClient.NetNamespaces().Update(netns)
return fmt.Errorf("network plugin does not allow NetNamespace renumbering")
}
vmap.lock.Lock()
defer vmap.lock.Unlock()
netid, err := vmap.updateNetID(netns.NetName, action, args)
if err != nil {
return err
}
netns.NetID = netid
osapi.DeleteChangePodNetworkAnnotation(netns)
if _, err := osClient.NetNamespaces().Update(netns); err != nil {
return err
}
return nil
}
//--------------------- Master methods ----------------------
func (master *OsdnMaster) VnidStartMaster() error {
err := master.vnids.populateVNIDs(master.osClient)
if err != nil {
return err
}
master.watchNamespaces()
go utilwait.Forever(master.watchNetNamespaces, 0)
return nil
}
func (master *OsdnMaster) watchNamespaces() {
RegisterSharedInformerEventHandlers(master.informers.InternalKubernetesInformers(),
master.handleAddOrUpdateNamespace, master.handleDeleteNamespace, Namespaces)
}
func (master *OsdnMaster) handleAddOrUpdateNamespace(obj, _ interface{}, eventType watch.EventType) {
ns := obj.(*kapi.Namespace)
log.V(5).Infof("Watch %s event for Namespace %q", eventType, ns.Name)
if err := master.vnids.assignVNID(master.osClient, ns.Name); err != nil {
log.Errorf("Error assigning netid: %v", err)
}
}
func (master *OsdnMaster) handleDeleteNamespace(obj interface{}) {
ns := obj.(*kapi.Namespace)
log.V(5).Infof("Watch %s event for Namespace %q", watch.Deleted, ns.Name)
if err := master.vnids.revokeVNID(master.osClient, ns.Name); err != nil {
log.Errorf("Error revoking netid: %v", err)
}
}
func (master *OsdnMaster) watchNetNamespaces() {
RunEventQueue(master.osClient, NetNamespaces, func(delta cache.Delta) error {
netns := delta.Object.(*osapi.NetNamespace)
name := netns.ObjectMeta.Name
log.V(5).Infof("Watch %s event for NetNamespace %q", delta.Type, name)
switch delta.Type {
case cache.Sync, cache.Added, cache.Updated:
err := master.vnids.updateVNID(master.osClient, netns)
if err != nil {
return fmt.Errorf("error updating netid: %v", err)
}
}
return nil
})
}