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//go:build linux
// +build linux
package overlay
//go:generate protoc -I.:../../Godeps/_workspace/src/github.com/gogo/protobuf --gogo_out=import_path=github.com/docker/docker/libnetwork/drivers/overlay,Mgogoproto/gogo.proto=github.com/gogo/protobuf/gogoproto:. overlay.proto
import (
"fmt"
"net"
"sync"
"github.com/docker/docker/libnetwork/datastore"
"github.com/docker/docker/libnetwork/discoverapi"
"github.com/docker/docker/libnetwork/driverapi"
"github.com/docker/docker/libnetwork/netlabel"
"github.com/docker/docker/libnetwork/osl"
"github.com/docker/docker/libnetwork/types"
"github.com/sirupsen/logrus"
)
const (
networkType = "overlay"
vethPrefix = "veth"
vethLen = len(vethPrefix) + 7
vxlanEncap = 50
secureOption = "encrypted"
)
type driver struct {
bindAddress string
advertiseAddress string
config map[string]interface{}
peerDb peerNetworkMap
secMap *encrMap
networks networkTable
localStore datastore.DataStore
initOS sync.Once
localJoinOnce sync.Once
keys []*key
peerOpMu sync.Mutex
sync.Mutex
}
// Register registers a new instance of the overlay driver.
func Register(r driverapi.Registerer, config map[string]interface{}) error {
c := driverapi.Capability{
DataScope: datastore.GlobalScope,
ConnectivityScope: datastore.GlobalScope,
}
d := &driver{
networks: networkTable{},
peerDb: peerNetworkMap{
mp: map[string]*peerMap{},
},
secMap: &encrMap{nodes: map[string][]*spi{}},
config: config,
}
if data, ok := config[netlabel.LocalKVClient]; ok {
var err error
dsc, ok := data.(discoverapi.DatastoreConfigData)
if !ok {
return types.InternalErrorf("incorrect data in datastore configuration: %v", data)
}
d.localStore, err = datastore.NewDataStoreFromConfig(dsc)
if err != nil {
return types.InternalErrorf("failed to initialize local data store: %v", err)
}
}
if err := d.restoreEndpoints(); err != nil {
logrus.Warnf("Failure during overlay endpoints restore: %v", err)
}
return r.RegisterDriver(networkType, d, c)
}
// Endpoints are stored in the local store. Restore them and reconstruct the overlay sandbox
func (d *driver) restoreEndpoints() error {
if d.localStore == nil {
logrus.Warn("Cannot restore overlay endpoints because local datastore is missing")
return nil
}
kvol, err := d.localStore.List(datastore.Key(overlayEndpointPrefix), &endpoint{})
if err != nil && err != datastore.ErrKeyNotFound {
return fmt.Errorf("failed to read overlay endpoint from store: %v", err)
}
if err == datastore.ErrKeyNotFound {
return nil
}
for _, kvo := range kvol {
ep := kvo.(*endpoint)
n := d.network(ep.nid)
if n == nil {
logrus.Debugf("Network (%.7s) not found for restored endpoint (%.7s)", ep.nid, ep.id)
logrus.Debugf("Deleting stale overlay endpoint (%.7s) from store", ep.id)
if err := d.deleteEndpointFromStore(ep); err != nil {
logrus.Debugf("Failed to delete stale overlay endpoint (%.7s) from store", ep.id)
}
continue
}
n.addEndpoint(ep)
s := n.getSubnetforIP(ep.addr)
if s == nil {
return fmt.Errorf("could not find subnet for endpoint %s", ep.id)
}
if err := n.joinSandbox(s, true, true); err != nil {
return fmt.Errorf("restore network sandbox failed: %v", err)
}
Ifaces := make(map[string][]osl.IfaceOption)
vethIfaceOption := make([]osl.IfaceOption, 1)
vethIfaceOption = append(vethIfaceOption, n.sbox.InterfaceOptions().Master(s.brName))
Ifaces["veth+veth"] = vethIfaceOption
err := n.sbox.Restore(Ifaces, nil, nil, nil)
if err != nil {
n.leaveSandbox()
return fmt.Errorf("failed to restore overlay sandbox: %v", err)
}
d.peerAdd(ep.nid, ep.id, ep.addr.IP, ep.addr.Mask, ep.mac, net.ParseIP(d.advertiseAddress), false, false, true)
}
return nil
}
func (d *driver) configure() error {
// Apply OS specific kernel configs if needed
d.initOS.Do(applyOStweaks)
return nil
}
func (d *driver) Type() string {
return networkType
}
func (d *driver) IsBuiltIn() bool {
return true
}
func (d *driver) nodeJoin(advertiseAddress, bindAddress string, self bool) {
if self {
d.Lock()
d.advertiseAddress = advertiseAddress
d.bindAddress = bindAddress
d.Unlock()
// If containers are already running on this network update the
// advertise address in the peerDB
d.localJoinOnce.Do(func() {
d.peerDBUpdateSelf()
})
}
}
// DiscoverNew is a notification for a new discovery event, such as a new node joining a cluster
func (d *driver) DiscoverNew(dType discoverapi.DiscoveryType, data interface{}) error {
switch dType {
case discoverapi.NodeDiscovery:
nodeData, ok := data.(discoverapi.NodeDiscoveryData)
if !ok || nodeData.Address == "" {
return fmt.Errorf("invalid discovery data")
}
d.nodeJoin(nodeData.Address, nodeData.BindAddress, nodeData.Self)
case discoverapi.EncryptionKeysConfig:
encrData, ok := data.(discoverapi.DriverEncryptionConfig)
if !ok {
return fmt.Errorf("invalid encryption key notification data")
}
keys := make([]*key, 0, len(encrData.Keys))
for i := 0; i < len(encrData.Keys); i++ {
k := &key{
value: encrData.Keys[i],
tag: uint32(encrData.Tags[i]),
}
keys = append(keys, k)
}
if err := d.setKeys(keys); err != nil {
logrus.Warn(err)
}
case discoverapi.EncryptionKeysUpdate:
var newKey, delKey, priKey *key
encrData, ok := data.(discoverapi.DriverEncryptionUpdate)
if !ok {
return fmt.Errorf("invalid encryption key notification data")
}
if encrData.Key != nil {
newKey = &key{
value: encrData.Key,
tag: uint32(encrData.Tag),
}
}
if encrData.Primary != nil {
priKey = &key{
value: encrData.Primary,
tag: uint32(encrData.PrimaryTag),
}
}
if encrData.Prune != nil {
delKey = &key{
value: encrData.Prune,
tag: uint32(encrData.PruneTag),
}
}
if err := d.updateKeys(newKey, priKey, delKey); err != nil {
return err
}
default:
}
return nil
}
// DiscoverDelete is a notification for a discovery delete event, such as a node leaving a cluster
func (d *driver) DiscoverDelete(dType discoverapi.DiscoveryType, data interface{}) error {
return nil
}
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