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|
package main
import (
"net"
"sync"
"sync/atomic"
)
/* Handles outbound flow
*
* 1. TUN queue
* 2. Routing
* 3. Per peer queuing
* 4. (work queuing)
*
*/
type OutboundWorkQueueElement struct {
wg sync.WaitGroup
packet []byte
nonce uint64
keyPair *KeyPair
}
func (device *Device) SendPacket(packet []byte) {
// lookup peer
var peer *Peer
switch packet[0] >> 4 {
case IPv4version:
dst := packet[IPv4offsetDst : IPv4offsetDst+net.IPv4len]
peer = device.routingTable.LookupIPv4(dst)
case IPv6version:
dst := packet[IPv6offsetDst : IPv6offsetDst+net.IPv6len]
peer = device.routingTable.LookupIPv6(dst)
default:
device.logger.Println("unknown IP version")
return
}
if peer == nil {
return
}
// insert into peer queue
for {
select {
case peer.queueOutboundRouting <- packet:
default:
select {
case <-peer.queueOutboundRouting:
default:
}
continue
}
break
}
}
/* Go routine
*
*
* 1. waits for handshake.
* 2. assigns key pair & nonce
* 3. inserts to working queue
*
* TODO: avoid dynamic allocation of work queue elements
*/
func (peer *Peer) ConsumeOutboundPackets() {
for {
// wait for key pair
keyPair := func() *KeyPair {
peer.keyPairs.mutex.RLock()
defer peer.keyPairs.mutex.RUnlock()
return peer.keyPairs.current
}()
if keyPair == nil {
if len(peer.queueOutboundRouting) > 0 {
// TODO: start handshake
<-peer.keyPairs.newKeyPair
}
continue
}
// assign packets key pair
for {
select {
case <-peer.keyPairs.newKeyPair:
default:
case <-peer.keyPairs.newKeyPair:
case packet := <-peer.queueOutboundRouting:
// create new work element
work := new(OutboundWorkQueueElement)
work.wg.Add(1)
work.keyPair = keyPair
work.packet = packet
work.nonce = atomic.AddUint64(&keyPair.sendNonce, 1) - 1
peer.queueOutbound <- work
// drop packets until there is room
for {
select {
case peer.device.queueWorkOutbound <- work:
break
default:
drop := <-peer.device.queueWorkOutbound
drop.packet = nil
drop.wg.Done()
}
}
}
}
}
}
func (peer *Peer) RoutineSequential() {
for work := range peer.queueOutbound {
work.wg.Wait()
if work.packet == nil {
continue
}
}
}
func (device *Device) EncryptionWorker() {
for {
work := <-device.queueWorkOutbound
func() {
defer work.wg.Done()
// pad packet
padding := device.mtu - len(work.packet)
if padding < 0 {
work.packet = nil
return
}
for n := 0; n < padding; n += 1 {
work.packet = append(work.packet, 0) // TODO: gotta be a faster way
}
//
}()
}
}
|
