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device: use channel close to shut down and drain decryption channel

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This is similar to commit e1fa1cc556,
but for the decryption channel.

It is an alternative fix to f9f655567930a4cd78d40fa4ba0d58503335ae6a.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder
2021-01-11 17:34:02 -08:00
committed by Jason A. Donenfeld
parent 675955de5d
commit 48c3b87eb8
2 changed files with 54 additions and 64 deletions
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37
device/device.go
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@@ -76,7 +76,7 @@ type Device struct {
queue struct {
encryption *encryptionQueue
decryption chan *QueueInboundElement
decryption *decryptionQueue
handshake chan QueueHandshakeElement
}
@@ -115,6 +115,24 @@ func newEncryptionQueue() *encryptionQueue {
return q
}
// A decryptionQueue is similar to an encryptionQueue; see those docs.
type decryptionQueue struct {
c chan *QueueInboundElement
wg sync.WaitGroup
}
func newDecryptionQueue() *decryptionQueue {
q := &decryptionQueue{
c: make(chan *QueueInboundElement, QueueInboundSize),
}
q.wg.Add(1)
go func() {
q.wg.Wait()
close(q.c)
}()
return q
}
/* Converts the peer into a "zombie", which remains in the peer map,
* but processes no packets and does not exists in the routing table.
*
@@ -308,7 +326,7 @@ func NewDevice(tunDevice tun.Device, logger *Logger) *Device {
device.queue.handshake = make(chan QueueHandshakeElement, QueueHandshakeSize)
device.queue.encryption = newEncryptionQueue()
device.queue.decryption = make(chan *QueueInboundElement, QueueInboundSize)
device.queue.decryption = newDecryptionQueue()
// prepare signals
@@ -369,13 +387,6 @@ func (device *Device) RemoveAllPeers() {
func (device *Device) FlushPacketQueues() {
for {
select {
case elem, ok := <-device.queue.decryption:
if ok {
if !elem.IsDropped() {
elem.Drop()
device.PutMessageBuffer(elem.buffer)
}
}
case <-device.queue.handshake:
default:
return
@@ -399,10 +410,11 @@ func (device *Device) Close() {
device.isUp.Set(false)
// We kept a reference to the encryption queue,
// in case we started any new peers that might write to it.
// No new peers are coming; we are done with the encryption queue.
// 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()
close(device.signals.stop)
device.state.stopping.Wait()
@@ -549,6 +561,7 @@ func (device *Device) BindUpdate() error {
// start receiving routines
device.net.stopping.Add(2)
device.queue.decryption.wg.Add(2) // each RoutineReceiveIncoming goroutine writes to device.queue.decryption
go device.RoutineReceiveIncoming(ipv4.Version, netc.bind)
go device.RoutineReceiveIncoming(ipv6.Version, netc.bind)