484a9fd324
In case some old packets snuck in there before, this flushes before starting afresh. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
132 lines
3.3 KiB
Go
132 lines
3.3 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
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*/
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package device
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import (
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"runtime"
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"sync"
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)
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// An outboundQueue is a channel of QueueOutboundElements awaiting encryption.
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// An outboundQueue is ref-counted using its wg field.
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// An outboundQueue created with newOutboundQueue has one reference.
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// Every additional writer must call wg.Add(1).
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// Every completed writer must call wg.Done().
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// When no further writers will be added,
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// call wg.Done to remove the initial reference.
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// When the refcount hits 0, the queue's channel is closed.
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type outboundQueue struct {
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c chan *QueueOutboundElement
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wg sync.WaitGroup
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}
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func newOutboundQueue() *outboundQueue {
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q := &outboundQueue{
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c: make(chan *QueueOutboundElement, QueueOutboundSize),
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}
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q.wg.Add(1)
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go func() {
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q.wg.Wait()
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close(q.c)
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}()
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return q
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}
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// A inboundQueue is similar to an outboundQueue; see those docs.
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type inboundQueue struct {
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c chan *QueueInboundElement
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wg sync.WaitGroup
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}
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func newInboundQueue() *inboundQueue {
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q := &inboundQueue{
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c: make(chan *QueueInboundElement, QueueInboundSize),
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}
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q.wg.Add(1)
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go func() {
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q.wg.Wait()
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close(q.c)
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}()
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return q
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}
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// A handshakeQueue is similar to an outboundQueue; see those docs.
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type handshakeQueue struct {
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c chan QueueHandshakeElement
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wg sync.WaitGroup
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}
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func newHandshakeQueue() *handshakeQueue {
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q := &handshakeQueue{
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c: make(chan QueueHandshakeElement, QueueHandshakeSize),
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}
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q.wg.Add(1)
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go func() {
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q.wg.Wait()
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close(q.c)
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}()
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return q
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}
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type autodrainingInboundQueue struct {
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c chan *QueueInboundElement
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}
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// newAutodrainingInboundQueue returns a channel that will be drained when it gets GC'd.
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// It is useful in cases in which is it hard to manage the lifetime of the channel.
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// The returned channel must not be closed. Senders should signal shutdown using
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// some other means, such as sending a sentinel nil values.
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func newAutodrainingInboundQueue(device *Device) *autodrainingInboundQueue {
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q := &autodrainingInboundQueue{
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c: make(chan *QueueInboundElement, QueueInboundSize),
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}
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runtime.SetFinalizer(q, device.flushInboundQueue)
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return q
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}
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func (device *Device) flushInboundQueue(q *autodrainingInboundQueue) {
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for {
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select {
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case elem := <-q.c:
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elem.Lock()
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device.PutMessageBuffer(elem.buffer)
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device.PutInboundElement(elem)
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default:
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return
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}
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}
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}
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type autodrainingOutboundQueue struct {
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c chan *QueueOutboundElement
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}
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// newAutodrainingOutboundQueue returns a channel that will be drained when it gets GC'd.
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// It is useful in cases in which is it hard to manage the lifetime of the channel.
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// The returned channel must not be closed. Senders should signal shutdown using
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// some other means, such as sending a sentinel nil values.
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// All sends to the channel must be best-effort, because there may be no receivers.
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func newAutodrainingOutboundQueue(device *Device) *autodrainingOutboundQueue {
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q := &autodrainingOutboundQueue{
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c: make(chan *QueueOutboundElement, QueueOutboundSize),
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}
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runtime.SetFinalizer(q, device.flushOutboundQueue)
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return q
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}
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func (device *Device) flushOutboundQueue(q *autodrainingOutboundQueue) {
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for {
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select {
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case elem := <-q.c:
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elem.Lock()
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device.PutMessageBuffer(elem.buffer)
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device.PutOutboundElement(elem)
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default:
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return
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}
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}
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}
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