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vnids.go
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vnids.go
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package osdn
import (
"fmt"
"strings"
"sync"
"time"
log "github.com/golang/glog"
kapi "k8s.io/kubernetes/pkg/api"
kubetypes "k8s.io/kubernetes/pkg/kubelet/container"
kerrors "k8s.io/kubernetes/pkg/util/errors"
utilruntime "k8s.io/kubernetes/pkg/util/runtime"
"k8s.io/kubernetes/pkg/util/sets"
utilwait "k8s.io/kubernetes/pkg/util/wait"
"k8s.io/kubernetes/pkg/watch"
"github.com/openshift/openshift-sdn/pkg/netutils"
osapi "github.com/openshift/origin/pkg/sdn/api"
)
const (
// Maximum VXLAN Network Identifier as per RFC#7348
MaxVNID = ((1 << 24) - 1)
// VNID for the admin namespaces
AdminVNID = uint(0)
)
type vnidMap struct {
ids map[string]uint
lock sync.Mutex
}
func newVnidMap() vnidMap {
return vnidMap{ids: make(map[string]uint)}
}
func (vmap vnidMap) GetVNID(name string) (uint, error) {
vmap.lock.Lock()
defer vmap.lock.Unlock()
if id, ok := vmap.ids[name]; ok {
return id, nil
}
// In case of error, return some value which is not a valid VNID
return MaxVNID + 1, fmt.Errorf("Failed to find netid for namespace: %s in vnid map", name)
}
// Nodes asynchronously watch for both NetNamespaces and services
// NetNamespaces populates vnid map and services/pod-setup depend on vnid map
// If for some reason, vnid map propagation from master to node is slow
// and if service/pod-setup tries to lookup vnid map then it may fail.
// So, use this method to alleviate this problem. This method will
// retry vnid lookup before giving up.
func (vmap vnidMap) WaitAndGetVNID(name string) (uint, error) {
// Try few times up to 2 seconds
retries := 20
retryInterval := 100 * time.Millisecond
for i := 0; i < retries; i++ {
if id, err := vmap.GetVNID(name); err == nil {
return id, nil
}
time.Sleep(retryInterval)
}
// In case of error, return some value which is not a valid VNID
return MaxVNID + 1, fmt.Errorf("Failed to find netid for namespace: %s in vnid map", name)
}
func (vmap vnidMap) SetVNID(name string, id uint) {
vmap.lock.Lock()
defer vmap.lock.Unlock()
vmap.ids[name] = id
log.Infof("Associate netid %d to namespace %q", id, name)
}
func (vmap vnidMap) UnsetVNID(name string) (id uint, err error) {
vmap.lock.Lock()
defer vmap.lock.Unlock()
id, found := vmap.ids[name]
if !found {
// In case of error, return some value which is not a valid VNID
return MaxVNID + 1, fmt.Errorf("Failed to find netid for namespace: %s in vnid map", name)
}
delete(vmap.ids, name)
log.Infof("Dissociate netid %d from namespace %q", id, name)
return id, nil
}
func (vmap vnidMap) CheckVNID(id uint) bool {
vmap.lock.Lock()
defer vmap.lock.Unlock()
for _, netid := range vmap.ids {
if netid == id {
return true
}
}
return false
}
func (vmap vnidMap) GetAllocatedVNIDs() []uint {
vmap.lock.Lock()
defer vmap.lock.Unlock()
ids := []uint{}
idSet := sets.Int{}
for _, id := range vmap.ids {
if id != AdminVNID {
if !idSet.Has(int(id)) {
ids = append(ids, id)
idSet.Insert(int(id))
}
}
}
return ids
}
func (vmap vnidMap) PopulateVNIDs(registry *Registry) error {
nets, err := registry.GetNetNamespaces()
if err != nil {
return err
}
for _, net := range nets {
vmap.SetVNID(net.Name, net.NetID)
}
return nil
}
func (master *OsdnMaster) VnidStartMaster() error {
err := master.vnids.PopulateVNIDs(master.registry)
if err != nil {
return err
}
// VNID: 0 reserved for default namespace and can reach any network in the cluster
// VNID: 1 to 9 are internally reserved for any special cases in the future
master.netIDManager, err = netutils.NewNetIDAllocator(10, MaxVNID, master.vnids.GetAllocatedVNIDs())
if err != nil {
return err
}
// 'default' namespace is currently always an admin namespace
master.adminNamespaces = append(master.adminNamespaces, "default")
go utilwait.Forever(master.watchNamespaces, 0)
return nil
}
func (master *OsdnMaster) isAdminNamespace(nsName string) bool {
for _, name := range master.adminNamespaces {
if name == nsName {
return true
}
}
return false
}
func (master *OsdnMaster) assignVNID(namespaceName string) error {
// Nothing to do if the netid is in the vnid map
if _, err := master.vnids.GetVNID(namespaceName); err == nil {
return nil
}
// If NetNamespace is present, update vnid map
netns, err := master.registry.GetNetNamespace(namespaceName)
if err == nil {
master.vnids.SetVNID(namespaceName, netns.NetID)
return nil
}
// NetNamespace not found, so allocate new NetID
var netid uint
if master.isAdminNamespace(namespaceName) {
netid = AdminVNID
} else {
var err error
netid, err = master.netIDManager.GetNetID()
if err != nil {
return err
}
}
// Create NetNamespace Object and update vnid map
err = master.registry.WriteNetNamespace(namespaceName, netid)
if err != nil {
e := master.netIDManager.ReleaseNetID(netid)
if e != nil {
log.Errorf("Error while releasing netid: %v", e)
}
return err
}
master.vnids.SetVNID(namespaceName, netid)
return nil
}
func (master *OsdnMaster) revokeVNID(namespaceName string) error {
// Remove NetID from vnid map
netid_found := true
netid, err := master.vnids.UnsetVNID(namespaceName)
if err != nil {
log.Error(err)
netid_found = false
}
// Delete NetNamespace object
err = master.registry.DeleteNetNamespace(namespaceName)
if err != nil {
return err
}
// Skip NetID release if
// - Value matches AdminVNID as it is not part of NetID allocation or
// - NetID is not found in the vnid map
if (netid == AdminVNID) || !netid_found {
return nil
}
// Check if this netid is used by any other namespaces
// If not, then release the netid
if !master.vnids.CheckVNID(netid) {
err = master.netIDManager.ReleaseNetID(netid)
if err != nil {
return fmt.Errorf("Error while releasing netid %d for namespace %q, %v", netid, namespaceName, err)
}
log.Infof("Released netid %d for namespace %q", netid, namespaceName)
} else {
log.V(5).Infof("netid %d for namespace %q is still in use", netid, namespaceName)
}
return nil
}
func (master *OsdnMaster) watchNamespaces() {
eventQueue := master.registry.RunEventQueue(Namespaces)
for {
eventType, obj, err := eventQueue.Pop()
if err != nil {
utilruntime.HandleError(fmt.Errorf("EventQueue failed for namespaces: %v", err))
return
}
ns := obj.(*kapi.Namespace)
name := ns.ObjectMeta.Name
log.V(5).Infof("Watch %s event for Namespace %q", strings.Title(string(eventType)), name)
switch eventType {
case watch.Added, watch.Modified:
err := master.assignVNID(name)
if err != nil {
log.Errorf("Error assigning netid: %v", err)
continue
}
case watch.Deleted:
err := master.revokeVNID(name)
if err != nil {
log.Errorf("Error revoking netid: %v", err)
continue
}
}
}
}
func (node *OsdnNode) VnidStartNode() error {
// Populate vnid map synchronously so that existing services can fetch vnid
err := node.vnids.PopulateVNIDs(node.registry)
if err != nil {
return err
}
go utilwait.Forever(node.watchNetNamespaces, 0)
go utilwait.Forever(node.watchServices, 0)
return nil
}
func (node *OsdnNode) updatePodNetwork(namespace string, netID uint) error {
// Update OF rules for the existing/old pods in the namespace
pods, err := node.GetLocalPods(namespace)
if err != nil {
return err
}
for _, pod := range pods {
err := node.UpdatePod(pod.Namespace, pod.Name, kubetypes.DockerID(getPodContainerID(&pod)))
if err != nil {
return err
}
}
// Update OF rules for the old services in the namespace
services, err := node.registry.GetServicesForNamespace(namespace)
if err != nil {
return err
}
errList := []error{}
for _, svc := range services {
if err := node.DeleteServiceRules(&svc); err != nil {
log.Error(err)
}
if err := node.AddServiceRules(&svc, netID); err != nil {
errList = append(errList, err)
}
}
return kerrors.NewAggregate(errList)
}
func (node *OsdnNode) watchNetNamespaces() {
eventQueue := node.registry.RunEventQueue(NetNamespaces)
for {
eventType, obj, err := eventQueue.Pop()
if err != nil {
utilruntime.HandleError(fmt.Errorf("EventQueue failed for network namespaces: %v", err))
return
}
netns := obj.(*osapi.NetNamespace)
log.V(5).Infof("Watch %s event for NetNamespace %q", strings.Title(string(eventType)), netns.ObjectMeta.Name)
switch eventType {
case watch.Added, watch.Modified:
// Skip this event if the old and new network ids are same
oldNetID, err := node.vnids.GetVNID(netns.NetName)
if (err == nil) && (oldNetID == netns.NetID) {
continue
}
node.vnids.SetVNID(netns.NetName, netns.NetID)
err = node.updatePodNetwork(netns.NetName, netns.NetID)
if err != nil {
log.Errorf("Failed to update pod network for namespace '%s', error: %s", netns.NetName, err)
node.vnids.SetVNID(netns.NetName, oldNetID)
continue
}
case watch.Deleted:
// updatePodNetwork needs vnid, so unset vnid after this call
err := node.updatePodNetwork(netns.NetName, AdminVNID)
if err != nil {
log.Errorf("Failed to update pod network for namespace '%s', error: %s", netns.NetName, err)
}
node.vnids.UnsetVNID(netns.NetName)
}
}
}
func isServiceChanged(oldsvc, newsvc *kapi.Service) bool {
if len(oldsvc.Spec.Ports) == len(newsvc.Spec.Ports) {
for i := range oldsvc.Spec.Ports {
if oldsvc.Spec.Ports[i].Protocol != newsvc.Spec.Ports[i].Protocol ||
oldsvc.Spec.Ports[i].Port != newsvc.Spec.Ports[i].Port {
return true
}
}
return false
}
return true
}
func (node *OsdnNode) watchServices() {
services := make(map[string]*kapi.Service)
eventQueue := node.registry.RunEventQueue(Services)
for {
eventType, obj, err := eventQueue.Pop()
if err != nil {
utilruntime.HandleError(fmt.Errorf("EventQueue failed for services: %v", err))
return
}
serv := obj.(*kapi.Service)
// Ignore headless services
if !kapi.IsServiceIPSet(serv) {
continue
}
log.V(5).Infof("Watch %s event for Service %q", strings.Title(string(eventType)), serv.ObjectMeta.Name)
switch eventType {
case watch.Added, watch.Modified:
oldsvc, exists := services[string(serv.UID)]
if exists {
if !isServiceChanged(oldsvc, serv) {
continue
}
if err := node.DeleteServiceRules(oldsvc); err != nil {
log.Error(err)
}
}
netid, err := node.vnids.WaitAndGetVNID(serv.Namespace)
if err != nil {
log.Errorf("Skipped adding service rules for serviceEvent: %v, Error: %v", eventType, err)
continue
}
if err := node.AddServiceRules(serv, netid); err != nil {
log.Error(err)
continue
}
services[string(serv.UID)] = serv
case watch.Deleted:
delete(services, string(serv.UID))
if err := node.DeleteServiceRules(serv); err != nil {
log.Error(err)
}
}
}
}