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package main
import (
"golang.org/x/net/ipv4"
"golang.org/x/net/ipv6"
"runtime"
"sync"
"sync/atomic"
"time"
)
type Device struct {
log *Logger // collection of loggers for levels
idCounter uint // for assigning debug ids to peers
fwMark uint32
tun struct {
device TUNDevice
isUp AtomicBool
mtu int32
}
pool struct {
messageBuffers sync.Pool
}
net struct {
mutex sync.RWMutex
bind UDPBind // bind interface
port uint16 // listening port
fwmark uint32 // mark value (0 = disabled)
update *sync.Cond // the bind was updated
}
mutex sync.RWMutex
privateKey NoisePrivateKey
publicKey NoisePublicKey
routingTable RoutingTable
indices IndexTable
queue struct {
encryption chan *QueueOutboundElement
decryption chan *QueueInboundElement
handshake chan QueueHandshakeElement
}
signal struct {
stop chan struct{}
}
underLoadUntil atomic.Value
ratelimiter Ratelimiter
peers map[NoisePublicKey]*Peer
mac CookieChecker
}
/* Warning:
* The caller must hold the device mutex (write lock)
*/
func removePeerUnsafe(device *Device, key NoisePublicKey) {
peer, ok := device.peers[key]
if !ok {
return
}
peer.mutex.Lock()
device.routingTable.RemovePeer(peer)
delete(device.peers, key)
peer.Close()
}
func (device *Device) IsUnderLoad() bool {
// check if currently under load
now := time.Now()
underLoad := len(device.queue.handshake) >= UnderLoadQueueSize
if underLoad {
device.underLoadUntil.Store(now.Add(time.Second))
return true
}
// check if recently under load
until := device.underLoadUntil.Load().(time.Time)
return until.After(now)
}
func (device *Device) SetPrivateKey(sk NoisePrivateKey) error {
device.mutex.Lock()
defer device.mutex.Unlock()
// remove peers with matching public keys
publicKey := sk.publicKey()
for key, peer := range device.peers {
h := &peer.handshake
h.mutex.RLock()
if h.remoteStatic.Equals(publicKey) {
removePeerUnsafe(device, key)
}
h.mutex.RUnlock()
}
// update key material
device.privateKey = sk
device.publicKey = publicKey
device.mac.Init(publicKey)
// do DH precomputations
rmKey := device.privateKey.IsZero()
for key, peer := range device.peers {
h := &peer.handshake
h.mutex.Lock()
if rmKey {
h.precomputedStaticStatic = [NoisePublicKeySize]byte{}
} else {
h.precomputedStaticStatic = device.privateKey.sharedSecret(h.remoteStatic)
if isZero(h.precomputedStaticStatic[:]) {
removePeerUnsafe(device, key)
}
}
h.mutex.Unlock()
}
return nil
}
func (device *Device) GetMessageBuffer() *[MaxMessageSize]byte {
return device.pool.messageBuffers.Get().(*[MaxMessageSize]byte)
}
func (device *Device) PutMessageBuffer(msg *[MaxMessageSize]byte) {
device.pool.messageBuffers.Put(msg)
}
func NewDevice(tun TUNDevice, logLevel int) *Device {
device := new(Device)
device.mutex.Lock()
defer device.mutex.Unlock()
device.log = NewLogger(logLevel, "("+tun.Name()+") ")
device.peers = make(map[NoisePublicKey]*Peer)
device.tun.device = tun
device.indices.Init()
device.ratelimiter.Init()
device.routingTable.Reset()
device.underLoadUntil.Store(time.Time{})
// setup buffer pool
device.pool.messageBuffers = sync.Pool{
New: func() interface{} {
return new([MaxMessageSize]byte)
},
}
// create queues
device.queue.handshake = make(chan QueueHandshakeElement, QueueHandshakeSize)
device.queue.encryption = make(chan *QueueOutboundElement, QueueOutboundSize)
device.queue.decryption = make(chan *QueueInboundElement, QueueInboundSize)
// prepare signals
device.signal.stop = make(chan struct{})
// prepare net
device.net.port = 0
device.net.bind = nil
device.net.update = sync.NewCond(&device.net.mutex)
// start workers
for i := 0; i < runtime.NumCPU(); i += 1 {
go device.RoutineEncryption()
go device.RoutineDecryption()
go device.RoutineHandshake()
}
go device.RoutineReadFromTUN()
go device.RoutineTUNEventReader()
go device.ratelimiter.RoutineGarbageCollector(device.signal.stop)
go device.RoutineReceiveIncomming(ipv4.Version)
go device.RoutineReceiveIncomming(ipv6.Version)
return device
}
func (device *Device) LookupPeer(pk NoisePublicKey) *Peer {
device.mutex.RLock()
defer device.mutex.RUnlock()
return device.peers[pk]
}
func (device *Device) RemovePeer(key NoisePublicKey) {
device.mutex.Lock()
defer device.mutex.Unlock()
removePeerUnsafe(device, key)
}
func (device *Device) RemoveAllPeers() {
device.mutex.Lock()
defer device.mutex.Unlock()
for key, peer := range device.peers {
peer.mutex.Lock()
delete(device.peers, key)
peer.Close()
peer.mutex.Unlock()
}
}
func (device *Device) Close() {
device.RemoveAllPeers()
close(device.signal.stop)
CloseUDPListener(device)
}
func (device *Device) WaitChannel() chan struct{} {
return device.signal.stop
}
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