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//go:build linux
package overlay
//go:generate protoc -I=. -I=../../../vendor/ --gogofaster_out=import_path=github.com/docker/docker/libnetwork/drivers/overlay:. overlay.proto
import (
"context"
"fmt"
"net"
"sync"
"github.com/containerd/log"
"github.com/docker/docker/libnetwork/discoverapi"
"github.com/docker/docker/libnetwork/driverapi"
"github.com/docker/docker/libnetwork/scope"
)
const (
NetworkType = "overlay"
vethPrefix = "veth"
vethLen = len(vethPrefix) + 7
vxlanEncap = 50
secureOption = "encrypted"
)
// overlay driver must implement the discover-API.
var _ discoverapi.Discover = (*driver)(nil)
type driver struct {
bindAddress, advertiseAddress net.IP
config map[string]interface{}
peerDb peerNetworkMap
secMap *encrMap
networks networkTable
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 {
d := &driver{
networks: networkTable{},
peerDb: peerNetworkMap{
mp: map[string]*peerMap{},
},
secMap: &encrMap{nodes: map[string][]*spi{}},
config: config,
}
return r.RegisterDriver(NetworkType, d, driverapi.Capability{
DataScope: scope.Global,
ConnectivityScope: scope.Global,
})
}
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
}
// isIPv6Transport reports whether the outer Layer-3 transport for VXLAN datagrams is IPv6.
func (d *driver) isIPv6Transport() (bool, error) {
// Infer whether remote peers' virtual tunnel endpoints will be IPv4 or IPv6
// from the address family of our own advertise address. This is a
// reasonable inference to make as Linux VXLAN links do not support
// mixed-address-family remote peers.
if d.advertiseAddress == nil {
return false, fmt.Errorf("overlay: cannot determine address family of transport: the local data-plane address is not currently known")
}
return d.advertiseAddress.To4() == nil, nil
}
func (d *driver) nodeJoin(data discoverapi.NodeDiscoveryData) error {
if data.Self {
advAddr, bindAddr := net.ParseIP(data.Address), net.ParseIP(data.BindAddress)
if advAddr == nil {
return fmt.Errorf("invalid discovery data")
}
d.Lock()
d.advertiseAddress = advAddr
d.bindAddress = bindAddr
d.Unlock()
// If containers are already running on this network update the
// advertise address in the peerDB
d.localJoinOnce.Do(func() {
d.peerDBUpdateSelf()
})
}
return nil
}
// 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 {
return fmt.Errorf("invalid discovery data type: %T", data)
}
return d.nodeJoin(nodeData)
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 {
log.G(context.TODO()).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
}
|
