forked from moby/libnetwork
/
overlay.go
164 lines (135 loc) · 3.3 KB
/
overlay.go
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package overlay
import (
"encoding/binary"
"fmt"
"net"
"sync"
"github.com/docker/libkv/store"
"github.com/docker/libnetwork/config"
"github.com/docker/libnetwork/datastore"
"github.com/docker/libnetwork/driverapi"
"github.com/docker/libnetwork/idm"
"github.com/docker/libnetwork/netlabel"
"github.com/hashicorp/serf/serf"
)
const (
networkType = "overlay"
vethPrefix = "veth"
vethLen = 7
vxlanIDStart = 256
vxlanIDEnd = 1000
vxlanPort = 4789
vxlanVethMTU = 1450
)
type driver struct {
eventCh chan serf.Event
notifyCh chan ovNotify
exitCh chan chan struct{}
ifaceName string
neighIP string
config map[string]interface{}
peerDb peerNetworkMap
serfInstance *serf.Serf
networks networkTable
store datastore.DataStore
ipAllocator *idm.Idm
vxlanIdm *idm.Idm
sync.Once
sync.Mutex
}
var (
bridgeSubnet, bridgeIP *net.IPNet
once sync.Once
bridgeSubnetInt uint32
)
func onceInit() {
var err error
_, bridgeSubnet, err = net.ParseCIDR("172.21.0.0/16")
if err != nil {
panic("could not parse cid 172.21.0.0/16")
}
bridgeSubnetInt = binary.BigEndian.Uint32(bridgeSubnet.IP.To4())
ip, subnet, err := net.ParseCIDR("172.21.255.254/16")
if err != nil {
panic("could not parse cid 172.21.255.254/16")
}
bridgeIP = &net.IPNet{
IP: ip,
Mask: subnet.Mask,
}
}
// Init registers a new instance of overlay driver
func Init(dc driverapi.DriverCallback, config map[string]interface{}) error {
once.Do(onceInit)
c := driverapi.Capability{
DataScope: datastore.GlobalScope,
}
d := &driver{
networks: networkTable{},
peerDb: peerNetworkMap{
mp: map[string]peerMap{},
},
config: config,
}
return dc.RegisterDriver(networkType, d, c)
}
// Fini cleans up the driver resources
func Fini(drv driverapi.Driver) {
d := drv.(*driver)
if d.exitCh != nil {
waitCh := make(chan struct{})
d.exitCh <- waitCh
<-waitCh
}
}
func (d *driver) configure() error {
var err error
if len(d.config) == 0 {
return nil
}
d.Do(func() {
if ifaceName, ok := d.config[netlabel.OverlayBindInterface]; ok {
d.ifaceName = ifaceName.(string)
}
if neighIP, ok := d.config[netlabel.OverlayNeighborIP]; ok {
d.neighIP = neighIP.(string)
}
provider, provOk := d.config[netlabel.KVProvider]
provURL, urlOk := d.config[netlabel.KVProviderURL]
if provOk && urlOk {
cfg := &config.DatastoreCfg{
Client: config.DatastoreClientCfg{
Provider: provider.(string),
Address: provURL.(string),
},
}
provConfig, confOk := d.config[netlabel.KVProviderConfig]
if confOk {
cfg.Client.Config = provConfig.(*store.Config)
}
d.store, err = datastore.NewDataStore(cfg)
if err != nil {
err = fmt.Errorf("failed to initialize data store: %v", err)
return
}
}
d.vxlanIdm, err = idm.New(d.store, "vxlan-id", vxlanIDStart, vxlanIDEnd)
if err != nil {
err = fmt.Errorf("failed to initialize vxlan id manager: %v", err)
return
}
d.ipAllocator, err = idm.New(d.store, "ipam-id", 1, 0xFFFF-2)
if err != nil {
err = fmt.Errorf("failed to initalize ipam id manager: %v", err)
return
}
err = d.serfInit()
if err != nil {
err = fmt.Errorf("initializing serf instance failed: %v", err)
}
})
return err
}
func (d *driver) Type() string {
return networkType
}