297 lines
7.3 KiB
Go
297 lines
7.3 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
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*/
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package device
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import (
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"container/list"
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"errors"
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"sync"
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"sync/atomic"
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"time"
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"gitea.hbanafa.com/hesham/wireguard-go/conn"
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)
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type Peer struct {
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isRunning atomic.Bool
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keypairs Keypairs
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handshake Handshake
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device *Device
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stopping sync.WaitGroup // routines pending stop
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txBytes atomic.Uint64 // bytes send to peer (endpoint)
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rxBytes atomic.Uint64 // bytes received from peer
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lastHandshakeNano atomic.Int64 // nano seconds since epoch
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endpoint struct {
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sync.Mutex
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val conn.Endpoint
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clearSrcOnTx bool // signal to val.ClearSrc() prior to next packet transmission
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disableRoaming bool
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}
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timers struct {
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retransmitHandshake *Timer
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sendKeepalive *Timer
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newHandshake *Timer
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zeroKeyMaterial *Timer
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persistentKeepalive *Timer
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handshakeAttempts atomic.Uint32
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needAnotherKeepalive atomic.Bool
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sentLastMinuteHandshake atomic.Bool
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}
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state struct {
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sync.Mutex // protects against concurrent Start/Stop
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}
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queue struct {
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staged chan *QueueOutboundElementsContainer // staged packets before a handshake is available
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outbound *autodrainingOutboundQueue // sequential ordering of udp transmission
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inbound *autodrainingInboundQueue // sequential ordering of tun writing
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}
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cookieGenerator CookieGenerator
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trieEntries list.List
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persistentKeepaliveInterval atomic.Uint32
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}
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func (device *Device) NewPeer(pk NoisePublicKey) (*Peer, error) {
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if device.isClosed() {
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return nil, errors.New("device closed")
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}
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// lock resources
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device.staticIdentity.RLock()
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defer device.staticIdentity.RUnlock()
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device.peers.Lock()
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defer device.peers.Unlock()
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// check if over limit
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if len(device.peers.keyMap) >= MaxPeers {
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return nil, errors.New("too many peers")
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}
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// create peer
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peer := new(Peer)
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peer.cookieGenerator.Init(pk)
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peer.device = device
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peer.queue.outbound = newAutodrainingOutboundQueue(device)
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peer.queue.inbound = newAutodrainingInboundQueue(device)
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peer.queue.staged = make(chan *QueueOutboundElementsContainer, QueueStagedSize)
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// map public key
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_, ok := device.peers.keyMap[pk]
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if ok {
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return nil, errors.New("adding existing peer")
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}
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// pre-compute DH
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handshake := &peer.handshake
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handshake.mutex.Lock()
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handshake.precomputedStaticStatic, _ = device.staticIdentity.privateKey.sharedSecret(pk)
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handshake.remoteStatic = pk
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handshake.mutex.Unlock()
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// reset endpoint
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peer.endpoint.Lock()
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peer.endpoint.val = nil
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peer.endpoint.disableRoaming = false
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peer.endpoint.clearSrcOnTx = false
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peer.endpoint.Unlock()
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// init timers
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peer.timersInit()
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// add
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device.peers.keyMap[pk] = peer
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return peer, nil
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}
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func (peer *Peer) SendBuffers(buffers [][]byte) error {
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peer.device.net.RLock()
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defer peer.device.net.RUnlock()
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if peer.device.isClosed() {
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return nil
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}
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peer.endpoint.Lock()
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endpoint := peer.endpoint.val
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if endpoint == nil {
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peer.endpoint.Unlock()
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return errors.New("no known endpoint for peer")
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}
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if peer.endpoint.clearSrcOnTx {
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endpoint.ClearSrc()
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peer.endpoint.clearSrcOnTx = false
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}
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peer.endpoint.Unlock()
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err := peer.device.net.bind.Send(buffers, endpoint)
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if err == nil {
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var totalLen uint64
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for _, b := range buffers {
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totalLen += uint64(len(b))
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}
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peer.txBytes.Add(totalLen)
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}
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return err
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}
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func (peer *Peer) String() string {
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// The awful goo that follows is identical to:
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//
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// base64Key := base64.StdEncoding.EncodeToString(peer.handshake.remoteStatic[:])
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// abbreviatedKey := base64Key[0:4] + "…" + base64Key[39:43]
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// return fmt.Sprintf("peer(%s)", abbreviatedKey)
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//
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// except that it is considerably more efficient.
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src := peer.handshake.remoteStatic
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b64 := func(input byte) byte {
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return input + 'A' + byte(((25-int(input))>>8)&6) - byte(((51-int(input))>>8)&75) - byte(((61-int(input))>>8)&15) + byte(((62-int(input))>>8)&3)
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}
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b := []byte("peer(____…____)")
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const first = len("peer(")
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const second = len("peer(____…")
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b[first+0] = b64((src[0] >> 2) & 63)
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b[first+1] = b64(((src[0] << 4) | (src[1] >> 4)) & 63)
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b[first+2] = b64(((src[1] << 2) | (src[2] >> 6)) & 63)
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b[first+3] = b64(src[2] & 63)
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b[second+0] = b64(src[29] & 63)
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b[second+1] = b64((src[30] >> 2) & 63)
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b[second+2] = b64(((src[30] << 4) | (src[31] >> 4)) & 63)
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b[second+3] = b64((src[31] << 2) & 63)
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return string(b)
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}
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func (peer *Peer) Start() {
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// should never start a peer on a closed device
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if peer.device.isClosed() {
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return
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}
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// prevent simultaneous start/stop operations
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peer.state.Lock()
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defer peer.state.Unlock()
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if peer.isRunning.Load() {
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return
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}
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device := peer.device
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device.log.Verbosef("%v - Starting", peer)
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// reset routine state
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peer.stopping.Wait()
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peer.stopping.Add(2)
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peer.handshake.mutex.Lock()
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peer.handshake.lastSentHandshake = time.Now().Add(-(RekeyTimeout + time.Second))
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peer.handshake.mutex.Unlock()
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peer.device.queue.encryption.wg.Add(1) // keep encryption queue open for our writes
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peer.timersStart()
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device.flushInboundQueue(peer.queue.inbound)
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device.flushOutboundQueue(peer.queue.outbound)
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// Use the device batch size, not the bind batch size, as the device size is
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// the size of the batch pools.
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batchSize := peer.device.BatchSize()
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go peer.RoutineSequentialSender(batchSize)
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go peer.RoutineSequentialReceiver(batchSize)
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peer.isRunning.Store(true)
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}
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func (peer *Peer) ZeroAndFlushAll() {
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device := peer.device
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// clear key pairs
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keypairs := &peer.keypairs
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keypairs.Lock()
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device.DeleteKeypair(keypairs.previous)
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device.DeleteKeypair(keypairs.current)
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device.DeleteKeypair(keypairs.next.Load())
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keypairs.previous = nil
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keypairs.current = nil
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keypairs.next.Store(nil)
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keypairs.Unlock()
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// clear handshake state
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handshake := &peer.handshake
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handshake.mutex.Lock()
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device.indexTable.Delete(handshake.localIndex)
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handshake.Clear()
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handshake.mutex.Unlock()
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peer.FlushStagedPackets()
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}
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func (peer *Peer) ExpireCurrentKeypairs() {
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handshake := &peer.handshake
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handshake.mutex.Lock()
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peer.device.indexTable.Delete(handshake.localIndex)
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handshake.Clear()
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peer.handshake.lastSentHandshake = time.Now().Add(-(RekeyTimeout + time.Second))
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handshake.mutex.Unlock()
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keypairs := &peer.keypairs
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keypairs.Lock()
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if keypairs.current != nil {
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keypairs.current.sendNonce.Store(RejectAfterMessages)
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}
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if next := keypairs.next.Load(); next != nil {
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next.sendNonce.Store(RejectAfterMessages)
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}
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keypairs.Unlock()
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}
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func (peer *Peer) Stop() {
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peer.state.Lock()
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defer peer.state.Unlock()
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if !peer.isRunning.Swap(false) {
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return
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}
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peer.device.log.Verbosef("%v - Stopping", peer)
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peer.timersStop()
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// Signal that RoutineSequentialSender and RoutineSequentialReceiver should exit.
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peer.queue.inbound.c <- nil
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peer.queue.outbound.c <- nil
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peer.stopping.Wait()
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peer.device.queue.encryption.wg.Done() // no more writes to encryption queue from us
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peer.ZeroAndFlushAll()
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}
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func (peer *Peer) SetEndpointFromPacket(endpoint conn.Endpoint) {
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peer.endpoint.Lock()
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defer peer.endpoint.Unlock()
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if peer.endpoint.disableRoaming {
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return
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}
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peer.endpoint.clearSrcOnTx = false
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peer.endpoint.val = endpoint
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}
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func (peer *Peer) markEndpointSrcForClearing() {
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peer.endpoint.Lock()
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defer peer.endpoint.Unlock()
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if peer.endpoint.val == nil {
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return
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}
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peer.endpoint.clearSrcOnTx = true
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}
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