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device.go
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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
*/
package device
import (
"runtime"
"sync"
"sync/atomic"
"time"
"github.com/amnezia-vpn/amneziawg-go/conn"
"github.com/amnezia-vpn/amneziawg-go/ipc"
"github.com/amnezia-vpn/amneziawg-go/ratelimiter"
"github.com/amnezia-vpn/amneziawg-go/rwcancel"
"github.com/amnezia-vpn/amneziawg-go/tun"
"github.com/tevino/abool/v2"
)
type Device struct {
state struct {
// state holds the device's state. It is accessed atomically.
// Use the device.deviceState method to read it.
// device.deviceState does not acquire the mutex, so it captures only a snapshot.
// During state transitions, the state variable is updated before the device itself.
// The state is thus either the current state of the device or
// the intended future state of the device.
// For example, while executing a call to Up, state will be deviceStateUp.
// There is no guarantee that that intended future state of the device
// will become the actual state; Up can fail.
// The device can also change state multiple times between time of check and time of use.
// Unsynchronized uses of state must therefore be advisory/best-effort only.
state atomic.Uint32 // actually a deviceState, but typed uint32 for convenience
// stopping blocks until all inputs to Device have been closed.
stopping sync.WaitGroup
// mu protects state changes.
sync.Mutex
}
net struct {
stopping sync.WaitGroup
sync.RWMutex
bind conn.Bind // bind interface
netlinkCancel *rwcancel.RWCancel
port uint16 // listening port
fwmark uint32 // mark value (0 = disabled)
brokenRoaming bool
}
staticIdentity struct {
sync.RWMutex
privateKey NoisePrivateKey
publicKey NoisePublicKey
}
peers struct {
sync.RWMutex // protects keyMap
keyMap map[NoisePublicKey]*Peer
}
rate struct {
underLoadUntil atomic.Int64
limiter ratelimiter.Ratelimiter
}
allowedips AllowedIPs
indexTable IndexTable
cookieChecker CookieChecker
pool struct {
inboundElementsContainer *WaitPool
outboundElementsContainer *WaitPool
messageBuffers *WaitPool
inboundElements *WaitPool
outboundElements *WaitPool
}
queue struct {
encryption *outboundQueue
decryption *inboundQueue
handshake *handshakeQueue
}
tun struct {
device tun.Device
mtu atomic.Int32
}
ipcMutex sync.RWMutex
closed chan struct{}
log *Logger
isASecOn abool.AtomicBool
aSecMux sync.RWMutex
aSecCfg aSecCfgType
}
type aSecCfgType struct {
isSet bool
junkPacketCount int
junkPacketMinSize int
junkPacketMaxSize int
initPacketJunkSize int
responsePacketJunkSize int
initPacketMagicHeader uint32
responsePacketMagicHeader uint32
underloadPacketMagicHeader uint32
transportPacketMagicHeader uint32
}
// deviceState represents the state of a Device.
// There are three states: down, up, closed.
// Transitions:
//
// down -----+
// ↑↓ ↓
// up -> closed
type deviceState uint32
//go:generate go run golang.org/x/tools/cmd/stringer -type deviceState -trimprefix=deviceState
const (
deviceStateDown deviceState = iota
deviceStateUp
deviceStateClosed
)
// deviceState returns device.state.state as a deviceState
// See those docs for how to interpret this value.
func (device *Device) deviceState() deviceState {
return deviceState(device.state.state.Load())
}
// isClosed reports whether the device is closed (or is closing).
// See device.state.state comments for how to interpret this value.
func (device *Device) isClosed() bool {
return device.deviceState() == deviceStateClosed
}
// isUp reports whether the device is up (or is attempting to come up).
// See device.state.state comments for how to interpret this value.
func (device *Device) isUp() bool {
return device.deviceState() == deviceStateUp
}
// Must hold device.peers.Lock()
func removePeerLocked(device *Device, peer *Peer, key NoisePublicKey) {
// stop routing and processing of packets
device.allowedips.RemoveByPeer(peer)
peer.Stop()
// remove from peer map
delete(device.peers.keyMap, key)
}
// changeState attempts to change the device state to match want.
func (device *Device) changeState(want deviceState) (err error) {
device.state.Lock()
defer device.state.Unlock()
old := device.deviceState()
if old == deviceStateClosed {
// once closed, always closed
device.log.Verbosef("Interface closed, ignored requested state %s", want)
return nil
}
switch want {
case old:
return nil
case deviceStateUp:
device.state.state.Store(uint32(deviceStateUp))
err = device.upLocked()
if err == nil {
break
}
fallthrough // up failed; bring the device all the way back down
case deviceStateDown:
device.state.state.Store(uint32(deviceStateDown))
errDown := device.downLocked()
if err == nil {
err = errDown
}
}
device.log.Verbosef(
"Interface state was %s, requested %s, now %s", old, want, device.deviceState())
return
}
// upLocked attempts to bring the device up and reports whether it succeeded.
// The caller must hold device.state.mu and is responsible for updating device.state.state.
func (device *Device) upLocked() error {
if err := device.BindUpdate(); err != nil {
device.log.Errorf("Unable to update bind: %v", err)
return err
}
// The IPC set operation waits for peers to be created before calling Start() on them,
// so if there's a concurrent IPC set request happening, we should wait for it to complete.
device.ipcMutex.Lock()
defer device.ipcMutex.Unlock()
device.peers.RLock()
for _, peer := range device.peers.keyMap {
peer.Start()
if peer.persistentKeepaliveInterval.Load() > 0 {
peer.SendKeepalive()
}
}
device.peers.RUnlock()
return nil
}
// downLocked attempts to bring the device down.
// The caller must hold device.state.mu and is responsible for updating device.state.state.
func (device *Device) downLocked() error {
err := device.BindClose()
if err != nil {
device.log.Errorf("Bind close failed: %v", err)
}
device.peers.RLock()
for _, peer := range device.peers.keyMap {
peer.Stop()
}
device.peers.RUnlock()
return err
}
func (device *Device) Up() error {
return device.changeState(deviceStateUp)
}
func (device *Device) Down() error {
return device.changeState(deviceStateDown)
}
func (device *Device) IsUnderLoad() bool {
// check if currently under load
now := time.Now()
underLoad := len(device.queue.handshake.c) >= QueueHandshakeSize/8
if underLoad {
device.rate.underLoadUntil.Store(now.Add(UnderLoadAfterTime).UnixNano())
return true
}
// check if recently under load
return device.rate.underLoadUntil.Load() > now.UnixNano()
}
func (device *Device) SetPrivateKey(sk NoisePrivateKey) error {
// lock required resources
device.staticIdentity.Lock()
defer device.staticIdentity.Unlock()
if sk.Equals(device.staticIdentity.privateKey) {
return nil
}
device.peers.Lock()
defer device.peers.Unlock()
lockedPeers := make([]*Peer, 0, len(device.peers.keyMap))
for _, peer := range device.peers.keyMap {
peer.handshake.mutex.RLock()
lockedPeers = append(lockedPeers, peer)
}
// remove peers with matching public keys
publicKey := sk.publicKey()
for key, peer := range device.peers.keyMap {
if peer.handshake.remoteStatic.Equals(publicKey) {
peer.handshake.mutex.RUnlock()
removePeerLocked(device, peer, key)
peer.handshake.mutex.RLock()
}
}
// update key material
device.staticIdentity.privateKey = sk
device.staticIdentity.publicKey = publicKey
device.cookieChecker.Init(publicKey)
// do static-static DH pre-computations
expiredPeers := make([]*Peer, 0, len(device.peers.keyMap))
for _, peer := range device.peers.keyMap {
handshake := &peer.handshake
handshake.precomputedStaticStatic, _ = device.staticIdentity.privateKey.sharedSecret(handshake.remoteStatic)
expiredPeers = append(expiredPeers, peer)
}
for _, peer := range lockedPeers {
peer.handshake.mutex.RUnlock()
}
for _, peer := range expiredPeers {
peer.ExpireCurrentKeypairs()
}
return nil
}
func NewDevice(tunDevice tun.Device, bind conn.Bind, logger *Logger) *Device {
device := new(Device)
device.state.state.Store(uint32(deviceStateDown))
device.closed = make(chan struct{})
device.log = logger
device.net.bind = bind
device.tun.device = tunDevice
mtu, err := device.tun.device.MTU()
if err != nil {
device.log.Errorf("Trouble determining MTU, assuming default: %v", err)
mtu = DefaultMTU
}
device.tun.mtu.Store(int32(mtu))
device.peers.keyMap = make(map[NoisePublicKey]*Peer)
device.rate.limiter.Init()
device.indexTable.Init()
device.PopulatePools()
// create queues
device.queue.handshake = newHandshakeQueue()
device.queue.encryption = newOutboundQueue()
device.queue.decryption = newInboundQueue()
// start workers
cpus := runtime.NumCPU()
device.state.stopping.Wait()
device.queue.encryption.wg.Add(cpus) // One for each RoutineHandshake
for i := 0; i < cpus; i++ {
go device.RoutineEncryption(i + 1)
go device.RoutineDecryption(i + 1)
go device.RoutineHandshake(i + 1)
}
device.state.stopping.Add(1) // RoutineReadFromTUN
device.queue.encryption.wg.Add(1) // RoutineReadFromTUN
go device.RoutineReadFromTUN()
go device.RoutineTUNEventReader()
return device
}
// BatchSize returns the BatchSize for the device as a whole which is the max of
// the bind batch size and the tun batch size. The batch size reported by device
// is the size used to construct memory pools, and is the allowed batch size for
// the lifetime of the device.
func (device *Device) BatchSize() int {
size := device.net.bind.BatchSize()
dSize := device.tun.device.BatchSize()
if size < dSize {
size = dSize
}
return size
}
func (device *Device) LookupPeer(pk NoisePublicKey) *Peer {
device.peers.RLock()
defer device.peers.RUnlock()
return device.peers.keyMap[pk]
}
func (device *Device) RemovePeer(key NoisePublicKey) {
device.peers.Lock()
defer device.peers.Unlock()
// stop peer and remove from routing
peer, ok := device.peers.keyMap[key]
if ok {
removePeerLocked(device, peer, key)
}
}
func (device *Device) RemoveAllPeers() {
device.peers.Lock()
defer device.peers.Unlock()
for key, peer := range device.peers.keyMap {
removePeerLocked(device, peer, key)
}
device.peers.keyMap = make(map[NoisePublicKey]*Peer)
}
func (device *Device) Close() {
device.state.Lock()
defer device.state.Unlock()
device.ipcMutex.Lock()
defer device.ipcMutex.Unlock()
if device.isClosed() {
return
}
device.state.state.Store(uint32(deviceStateClosed))
device.log.Verbosef("Device closing")
device.tun.device.Close()
device.downLocked()
// Remove peers before closing queues,
// because peers assume that queues are active.
device.RemoveAllPeers()
// We kept a reference to the encryption and decryption queues,
// in case we started any new peers that might write to them.
// No new peers are coming; we are done with these queues.
device.queue.encryption.wg.Done()
device.queue.decryption.wg.Done()
device.queue.handshake.wg.Done()
device.state.stopping.Wait()
device.rate.limiter.Close()
device.log.Verbosef("Device closed")
close(device.closed)
}
func (device *Device) Wait() chan struct{} {
return device.closed
}
func (device *Device) SendKeepalivesToPeersWithCurrentKeypair() {
if !device.isUp() {
return
}
device.peers.RLock()
for _, peer := range device.peers.keyMap {
peer.keypairs.RLock()
sendKeepalive := peer.keypairs.current != nil && !peer.keypairs.current.created.Add(RejectAfterTime).Before(time.Now())
peer.keypairs.RUnlock()
if sendKeepalive {
peer.SendKeepalive()
}
}
device.peers.RUnlock()
}
// closeBindLocked closes the device's net.bind.
// The caller must hold the net mutex.
func closeBindLocked(device *Device) error {
var err error
netc := &device.net
if netc.netlinkCancel != nil {
netc.netlinkCancel.Cancel()
}
if netc.bind != nil {
err = netc.bind.Close()
}
netc.stopping.Wait()
return err
}
func (device *Device) Bind() conn.Bind {
device.net.Lock()
defer device.net.Unlock()
return device.net.bind
}
func (device *Device) BindSetMark(mark uint32) error {
device.net.Lock()
defer device.net.Unlock()
// check if modified
if device.net.fwmark == mark {
return nil
}
// update fwmark on existing bind
device.net.fwmark = mark
if device.isUp() && device.net.bind != nil {
if err := device.net.bind.SetMark(mark); err != nil {
return err
}
}
// clear cached source addresses
device.peers.RLock()
for _, peer := range device.peers.keyMap {
peer.markEndpointSrcForClearing()
}
device.peers.RUnlock()
return nil
}
func (device *Device) BindUpdate() error {
device.net.Lock()
defer device.net.Unlock()
// close existing sockets
if err := closeBindLocked(device); err != nil {
return err
}
// open new sockets
if !device.isUp() {
return nil
}
// bind to new port
var err error
var recvFns []conn.ReceiveFunc
netc := &device.net
recvFns, netc.port, err = netc.bind.Open(netc.port)
if err != nil {
netc.port = 0
return err
}
netc.netlinkCancel, err = device.startRouteListener(netc.bind)
if err != nil {
netc.bind.Close()
netc.port = 0
return err
}
// set fwmark
if netc.fwmark != 0 {
err = netc.bind.SetMark(netc.fwmark)
if err != nil {
return err
}
}
// clear cached source addresses
device.peers.RLock()
for _, peer := range device.peers.keyMap {
peer.markEndpointSrcForClearing()
}
device.peers.RUnlock()
// start receiving routines
device.net.stopping.Add(len(recvFns))
device.queue.decryption.wg.Add(len(recvFns)) // each RoutineReceiveIncoming goroutine writes to device.queue.decryption
device.queue.handshake.wg.Add(len(recvFns)) // each RoutineReceiveIncoming goroutine writes to device.queue.handshake
batchSize := netc.bind.BatchSize()
for _, fn := range recvFns {
go device.RoutineReceiveIncoming(batchSize, fn)
}
device.log.Verbosef("UDP bind has been updated")
device.log.Verbosef(netc.bind.GetOffloadInfo())
return nil
}
func (device *Device) BindClose() error {
device.net.Lock()
err := closeBindLocked(device)
device.net.Unlock()
return err
}
func (device *Device) isAdvancedSecurityOn() bool {
return device.isASecOn.IsSet()
}
func (device *Device) handlePostConfig(tempASecCfg *aSecCfgType) (err error) {
if !tempASecCfg.isSet {
return err
}
isASecOn := false
device.aSecMux.Lock()
if tempASecCfg.junkPacketCount < 0 {
err = ipcErrorf(
ipc.IpcErrorInvalid,
"JunkPacketCount should be non negative",
)
}
device.aSecCfg.junkPacketCount = tempASecCfg.junkPacketCount
if tempASecCfg.junkPacketCount != 0 {
isASecOn = true
}
device.aSecCfg.junkPacketMinSize = tempASecCfg.junkPacketMinSize
if tempASecCfg.junkPacketMinSize != 0 {
isASecOn = true
}
if device.aSecCfg.junkPacketCount > 0 &&
tempASecCfg.junkPacketMaxSize == tempASecCfg.junkPacketMinSize {
tempASecCfg.junkPacketMaxSize++ // to make rand gen work
}
if tempASecCfg.junkPacketMaxSize >= MaxSegmentSize {
device.aSecCfg.junkPacketMinSize = 0
device.aSecCfg.junkPacketMaxSize = 1
if err != nil {
err = ipcErrorf(
ipc.IpcErrorInvalid,
"JunkPacketMaxSize: %d; should be smaller than maxSegmentSize: %d; %w",
tempASecCfg.junkPacketMaxSize,
MaxSegmentSize,
err,
)
} else {
err = ipcErrorf(
ipc.IpcErrorInvalid,
"JunkPacketMaxSize: %d; should be smaller than maxSegmentSize: %d",
tempASecCfg.junkPacketMaxSize,
MaxSegmentSize,
)
}
} else if tempASecCfg.junkPacketMaxSize < tempASecCfg.junkPacketMinSize {
if err != nil {
err = ipcErrorf(
ipc.IpcErrorInvalid,
"maxSize: %d; should be greater than minSize: %d; %w",
tempASecCfg.junkPacketMaxSize,
tempASecCfg.junkPacketMinSize,
err,
)
} else {
err = ipcErrorf(
ipc.IpcErrorInvalid,
"maxSize: %d; should be greater than minSize: %d",
tempASecCfg.junkPacketMaxSize,
tempASecCfg.junkPacketMinSize,
)
}
} else {
device.aSecCfg.junkPacketMaxSize = tempASecCfg.junkPacketMaxSize
}
if tempASecCfg.junkPacketMaxSize != 0 {
isASecOn = true
}
if MessageInitiationSize+tempASecCfg.initPacketJunkSize >= MaxSegmentSize {
if err != nil {
err = ipcErrorf(
ipc.IpcErrorInvalid,
`init header size(148) + junkSize:%d; should be smaller than maxSegmentSize: %d; %w`,
tempASecCfg.initPacketJunkSize,
MaxSegmentSize,
err,
)
} else {
err = ipcErrorf(
ipc.IpcErrorInvalid,
`init header size(148) + junkSize:%d; should be smaller than maxSegmentSize: %d`,
tempASecCfg.initPacketJunkSize,
MaxSegmentSize,
)
}
} else {
device.aSecCfg.initPacketJunkSize = tempASecCfg.initPacketJunkSize
}
if tempASecCfg.initPacketJunkSize != 0 {
isASecOn = true
}
if MessageResponseSize+tempASecCfg.responsePacketJunkSize >= MaxSegmentSize {
if err != nil {
err = ipcErrorf(
ipc.IpcErrorInvalid,
`response header size(92) + junkSize:%d; should be smaller than maxSegmentSize: %d; %w`,
tempASecCfg.responsePacketJunkSize,
MaxSegmentSize,
err,
)
} else {
err = ipcErrorf(
ipc.IpcErrorInvalid,
`response header size(92) + junkSize:%d; should be smaller than maxSegmentSize: %d`,
tempASecCfg.responsePacketJunkSize,
MaxSegmentSize,
)
}
} else {
device.aSecCfg.responsePacketJunkSize = tempASecCfg.responsePacketJunkSize
}
if tempASecCfg.responsePacketJunkSize != 0 {
isASecOn = true
}
if tempASecCfg.initPacketMagicHeader > 4 {
isASecOn = true
device.log.Verbosef("UAPI: Updating init_packet_magic_header")
device.aSecCfg.initPacketMagicHeader = tempASecCfg.initPacketMagicHeader
MessageInitiationType = device.aSecCfg.initPacketMagicHeader
} else {
device.log.Verbosef("UAPI: Using default init type")
MessageInitiationType = 1
}
if tempASecCfg.responsePacketMagicHeader > 4 {
isASecOn = true
device.log.Verbosef("UAPI: Updating response_packet_magic_header")
device.aSecCfg.responsePacketMagicHeader = tempASecCfg.responsePacketMagicHeader
MessageResponseType = device.aSecCfg.responsePacketMagicHeader
} else {
device.log.Verbosef("UAPI: Using default response type")
MessageResponseType = 2
}
if tempASecCfg.underloadPacketMagicHeader > 4 {
isASecOn = true
device.log.Verbosef("UAPI: Updating underload_packet_magic_header")
device.aSecCfg.underloadPacketMagicHeader = tempASecCfg.underloadPacketMagicHeader
MessageCookieReplyType = device.aSecCfg.underloadPacketMagicHeader
} else {
device.log.Verbosef("UAPI: Using default underload type")
MessageCookieReplyType = 3
}
if tempASecCfg.transportPacketMagicHeader > 4 {
isASecOn = true
device.log.Verbosef("UAPI: Updating transport_packet_magic_header")
device.aSecCfg.transportPacketMagicHeader = tempASecCfg.transportPacketMagicHeader
MessageTransportType = device.aSecCfg.transportPacketMagicHeader
} else {
device.log.Verbosef("UAPI: Using default transport type")
MessageTransportType = 4
}
isSameMap := map[uint32]bool{}
isSameMap[MessageInitiationType] = true
isSameMap[MessageResponseType] = true
isSameMap[MessageCookieReplyType] = true
isSameMap[MessageTransportType] = true
// size will be different if same values
if len(isSameMap) != 4 {
if err != nil {
err = ipcErrorf(
ipc.IpcErrorInvalid,
`magic headers should differ; got: init:%d; recv:%d; unde:%d; tran:%d; %w`,
MessageInitiationType,
MessageResponseType,
MessageCookieReplyType,
MessageTransportType,
err,
)
} else {
err = ipcErrorf(
ipc.IpcErrorInvalid,
`magic headers should differ; got: init:%d; recv:%d; unde:%d; tran:%d`,
MessageInitiationType,
MessageResponseType,
MessageCookieReplyType,
MessageTransportType,
)
}
}
newInitSize := MessageInitiationSize + device.aSecCfg.initPacketJunkSize
newResponseSize := MessageResponseSize + device.aSecCfg.responsePacketJunkSize
if newInitSize == newResponseSize {
if err != nil {
err = ipcErrorf(
ipc.IpcErrorInvalid,
`new init size:%d; and new response size:%d; should differ; %w`,
newInitSize,
newResponseSize,
err,
)
} else {
err = ipcErrorf(
ipc.IpcErrorInvalid,
`new init size:%d; and new response size:%d; should differ`,
newInitSize,
newResponseSize,
)
}
} else {
packetSizeToMsgType = map[int]uint32{
newInitSize: MessageInitiationType,
newResponseSize: MessageResponseType,
MessageCookieReplySize: MessageCookieReplyType,
MessageTransportSize: MessageTransportType,
}
msgTypeToJunkSize = map[uint32]int{
MessageInitiationType: device.aSecCfg.initPacketJunkSize,
MessageResponseType: device.aSecCfg.responsePacketJunkSize,
MessageCookieReplyType: 0,
MessageTransportType: 0,
}
}
device.isASecOn.SetTo(isASecOn)
device.aSecMux.Unlock()
return err
}