2018-05-03 13:04:00 +00:00
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/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2017-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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2017-06-26 11:14:02 +00:00
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package main
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import (
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2017-06-26 20:07:29 +00:00
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"encoding/binary"
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"golang.org/x/crypto/chacha20poly1305"
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2017-07-13 12:32:40 +00:00
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"golang.org/x/net/ipv4"
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"golang.org/x/net/ipv6"
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2017-06-26 11:14:02 +00:00
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"net"
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"sync"
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2017-06-30 12:41:08 +00:00
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"sync/atomic"
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"time"
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2017-06-26 11:14:02 +00:00
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)
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2017-12-01 22:37:26 +00:00
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/* Outbound flow
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2017-06-26 11:14:02 +00:00
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*
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* 1. TUN queue
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2017-06-28 21:45:45 +00:00
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* 2. Routing (sequential)
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* 3. Nonce assignment (sequential)
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* 4. Encryption (parallel)
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* 5. Transmission (sequential)
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2017-06-26 11:14:02 +00:00
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*
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2017-12-01 22:37:26 +00:00
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* The functions in this file occur (roughly) in the order in
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* which the packets are processed.
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*
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* Locking, Producers and Consumers
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*
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* The order of packets (per peer) must be maintained,
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* but encryption of packets happen out-of-order:
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*
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* The sequential consumers will attempt to take the lock,
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2017-07-13 12:32:40 +00:00
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* workers release lock when they have completed work (encryption) on the packet.
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2017-07-06 13:43:55 +00:00
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*
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* If the element is inserted into the "encryption queue",
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2017-12-01 22:37:26 +00:00
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* the content is preceded by enough "junk" to contain the transport header
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2017-07-07 11:47:09 +00:00
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* (to allow the construction of transport messages in-place)
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2017-06-28 21:45:45 +00:00
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*/
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2017-12-01 22:37:26 +00:00
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2017-06-28 21:45:45 +00:00
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type QueueOutboundElement struct {
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2017-07-08 21:51:26 +00:00
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dropped int32
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2017-06-28 21:45:45 +00:00
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mutex sync.Mutex
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2017-07-14 12:25:18 +00:00
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buffer *[MaxMessageSize]byte // slice holding the packet data
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2017-09-09 13:03:01 +00:00
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packet []byte // slice of "buffer" (always!)
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2017-07-14 12:25:18 +00:00
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nonce uint64 // nonce for encryption
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keyPair *KeyPair // key-pair for encryption
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peer *Peer // related peer
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2017-06-26 11:14:02 +00:00
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}
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2018-05-05 00:20:52 +00:00
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func (peer *Peer) flushNonceQueue() {
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2017-06-28 21:45:45 +00:00
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elems := len(peer.queue.nonce)
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2017-07-13 12:32:40 +00:00
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for i := 0; i < elems; i++ {
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2017-06-28 21:45:45 +00:00
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select {
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case <-peer.queue.nonce:
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default:
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return
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}
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}
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2017-06-27 15:33:06 +00:00
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}
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2017-07-06 13:43:55 +00:00
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func (device *Device) NewOutboundElement() *QueueOutboundElement {
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2017-07-14 12:25:18 +00:00
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return &QueueOutboundElement{
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dropped: AtomicFalse,
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buffer: device.pool.messageBuffers.Get().(*[MaxMessageSize]byte),
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}
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2017-07-06 13:43:55 +00:00
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}
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func (elem *QueueOutboundElement) Drop() {
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2017-07-08 21:51:26 +00:00
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atomic.StoreInt32(&elem.dropped, AtomicTrue)
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2017-07-06 13:43:55 +00:00
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}
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func (elem *QueueOutboundElement) IsDropped() bool {
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2017-07-08 21:51:26 +00:00
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return atomic.LoadInt32(&elem.dropped) == AtomicTrue
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2017-07-06 13:43:55 +00:00
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}
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func addToOutboundQueue(
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queue chan *QueueOutboundElement,
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element *QueueOutboundElement,
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) {
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2017-06-28 21:45:45 +00:00
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for {
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select {
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2017-07-06 13:43:55 +00:00
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case queue <- element:
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2017-06-30 12:41:08 +00:00
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return
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2017-06-28 21:45:45 +00:00
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default:
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select {
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2017-07-06 13:43:55 +00:00
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case old := <-queue:
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old.Drop()
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2017-06-28 21:45:45 +00:00
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default:
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}
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}
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}
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}
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2017-06-26 11:14:02 +00:00
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2017-07-08 21:51:26 +00:00
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func addToEncryptionQueue(
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queue chan *QueueOutboundElement,
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element *QueueOutboundElement,
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) {
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for {
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select {
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case queue <- element:
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return
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default:
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select {
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case old := <-queue:
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2017-08-25 12:53:23 +00:00
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// drop & release to potential consumer
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2017-07-08 21:51:26 +00:00
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old.Drop()
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old.mutex.Unlock()
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default:
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}
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}
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}
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}
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2017-06-28 21:45:45 +00:00
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/* Reads packets from the TUN and inserts
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* into nonce queue for peer
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*
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* Obs. Single instance per TUN device
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*/
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2017-08-04 14:15:53 +00:00
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func (device *Device) RoutineReadFromTUN() {
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2017-07-13 12:32:40 +00:00
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2017-08-25 12:53:23 +00:00
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elem := device.NewOutboundElement()
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2017-07-06 13:43:55 +00:00
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2017-07-13 12:32:40 +00:00
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logDebug := device.log.Debug
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logError := device.log.Error
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2018-05-01 14:59:13 +00:00
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defer func() {
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logDebug.Println("Routine: TUN reader - stopped")
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}()
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logDebug.Println("Routine: TUN reader - started")
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2017-07-13 12:32:40 +00:00
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2017-06-28 21:45:45 +00:00
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for {
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2017-06-26 11:14:02 +00:00
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2017-08-25 12:53:23 +00:00
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// read packet
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2017-07-06 13:43:55 +00:00
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2017-12-04 20:39:06 +00:00
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offset := MessageTransportHeaderSize
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size, err := device.tun.device.Read(elem.buffer[:], offset)
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2017-06-28 21:45:45 +00:00
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if err != nil {
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2017-07-13 12:32:40 +00:00
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logError.Println("Failed to read packet from TUN device:", err)
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device.Close()
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return
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2017-06-28 21:45:45 +00:00
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}
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2017-07-13 12:32:40 +00:00
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2017-08-25 12:53:23 +00:00
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if size == 0 || size > MaxContentSize {
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2017-06-28 21:45:45 +00:00
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continue
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}
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2017-06-26 11:14:02 +00:00
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2017-12-04 20:39:06 +00:00
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elem.packet = elem.buffer[offset : offset+size]
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2017-08-04 14:15:53 +00:00
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2017-06-28 21:45:45 +00:00
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// lookup peer
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2017-06-26 11:14:02 +00:00
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2017-06-28 21:45:45 +00:00
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var peer *Peer
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2017-07-06 13:43:55 +00:00
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switch elem.packet[0] >> 4 {
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2017-07-13 12:32:40 +00:00
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case ipv4.Version:
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2017-08-04 14:15:53 +00:00
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if len(elem.packet) < ipv4.HeaderLen {
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continue
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}
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2017-07-06 13:43:55 +00:00
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dst := elem.packet[IPv4offsetDst : IPv4offsetDst+net.IPv4len]
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2018-02-02 15:40:14 +00:00
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peer = device.routing.table.LookupIPv4(dst)
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2017-06-26 11:14:02 +00:00
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2017-07-13 12:32:40 +00:00
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case ipv6.Version:
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2017-08-04 14:15:53 +00:00
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if len(elem.packet) < ipv6.HeaderLen {
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continue
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}
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2017-07-06 13:43:55 +00:00
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dst := elem.packet[IPv6offsetDst : IPv6offsetDst+net.IPv6len]
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2018-02-02 15:40:14 +00:00
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peer = device.routing.table.LookupIPv6(dst)
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2017-06-26 11:14:02 +00:00
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default:
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2017-12-01 22:37:26 +00:00
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logDebug.Println("Received packet with unknown IP version")
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2017-06-28 21:45:45 +00:00
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}
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if peer == nil {
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2017-06-29 12:39:21 +00:00
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continue
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2017-06-28 21:45:45 +00:00
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}
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2017-07-13 12:32:40 +00:00
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2017-06-28 21:45:45 +00:00
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// insert into nonce/pre-handshake queue
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2018-01-26 21:52:32 +00:00
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if peer.isRunning.Get() {
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2018-05-05 00:20:52 +00:00
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peer.event.handshakePushDeadline.Fire()
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2018-01-26 21:52:32 +00:00
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addToOutboundQueue(peer.queue.nonce, elem)
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elem = device.NewOutboundElement()
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}
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2017-06-26 11:14:02 +00:00
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}
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}
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2017-06-28 21:45:45 +00:00
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/* Queues packets when there is no handshake.
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* Then assigns nonces to packets sequentially
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* and creates "work" structs for workers
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2017-06-26 11:14:02 +00:00
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*
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2017-06-28 21:45:45 +00:00
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* Obs. A single instance per peer
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2017-06-26 11:14:02 +00:00
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*/
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2017-06-28 21:45:45 +00:00
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func (peer *Peer) RoutineNonce() {
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2017-06-26 20:07:29 +00:00
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var keyPair *KeyPair
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2017-06-30 12:41:08 +00:00
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device := peer.device
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2017-07-07 11:47:09 +00:00
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logDebug := device.log.Debug
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2018-02-04 18:18:44 +00:00
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defer func() {
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2018-05-05 00:20:52 +00:00
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logDebug.Println(peer, ": Routine: nonce worker - stopped")
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2018-05-05 04:09:30 +00:00
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peer.routines.stopping.Done()
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2018-02-04 18:18:44 +00:00
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}()
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2017-06-26 20:07:29 +00:00
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2018-02-02 15:40:14 +00:00
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peer.routines.starting.Done()
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2018-05-05 00:20:52 +00:00
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logDebug.Println(peer, ": Routine: nonce worker - started")
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2018-02-02 15:40:14 +00:00
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2017-09-09 13:03:01 +00:00
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for {
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NextPacket:
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select {
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2018-01-13 08:00:37 +00:00
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case <-peer.routines.stop.Wait():
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2017-09-09 13:03:01 +00:00
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return
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2017-06-30 12:41:08 +00:00
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2018-05-01 14:59:13 +00:00
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case elem, ok := <-peer.queue.nonce:
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if !ok {
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return
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}
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2017-06-26 11:14:02 +00:00
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2017-06-30 12:41:08 +00:00
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// wait for key pair
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for {
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2018-05-05 02:15:07 +00:00
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peer.event.newKeyPair.Clear()
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2017-06-26 20:07:29 +00:00
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keyPair = peer.keyPairs.Current()
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2017-06-30 12:41:08 +00:00
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if keyPair != nil && keyPair.sendNonce < RejectAfterMessages {
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if time.Now().Sub(keyPair.created) < RejectAfterTime {
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break
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}
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}
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2017-09-09 13:03:01 +00:00
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2018-05-05 02:15:07 +00:00
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peer.event.handshakeBegin.Fire()
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2017-11-30 22:22:40 +00:00
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2018-05-05 00:20:52 +00:00
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logDebug.Println(peer, ": Awaiting key-pair")
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2017-06-26 20:07:29 +00:00
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2017-06-30 12:41:08 +00:00
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select {
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2018-05-05 02:15:07 +00:00
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case <-peer.event.newKeyPair.C:
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2018-05-05 00:20:52 +00:00
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logDebug.Println(peer, ": Obtained awaited key-pair")
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case <-peer.signal.flushNonceQueue:
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2017-06-30 12:41:08 +00:00
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goto NextPacket
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2018-01-13 08:00:37 +00:00
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case <-peer.routines.stop.Wait():
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2017-06-30 12:41:08 +00:00
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return
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}
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}
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2017-06-26 11:14:02 +00:00
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2017-09-09 13:03:01 +00:00
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// populate work element
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2017-06-26 11:14:02 +00:00
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2017-09-09 13:03:01 +00:00
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elem.peer = peer
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elem.nonce = atomic.AddUint64(&keyPair.sendNonce, 1) - 1
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elem.keyPair = keyPair
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elem.dropped = AtomicFalse
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elem.mutex.Lock()
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2017-07-06 13:43:55 +00:00
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2017-09-09 13:03:01 +00:00
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// add to parallel and sequential queue
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2017-07-06 13:43:55 +00:00
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2017-09-09 13:03:01 +00:00
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addToEncryptionQueue(device.queue.encryption, elem)
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addToOutboundQueue(peer.queue.outbound, elem)
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2017-06-26 11:14:02 +00:00
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}
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2017-09-09 13:03:01 +00:00
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}
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2017-06-26 11:14:02 +00:00
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}
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2017-06-28 21:45:45 +00:00
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/* Encrypts the elements in the queue
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* and marks them for sequential consumption (by releasing the mutex)
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2017-06-26 20:07:29 +00:00
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*
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2017-06-28 21:45:45 +00:00
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* Obs. One instance per core
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2017-06-26 20:07:29 +00:00
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*/
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2017-06-28 21:45:45 +00:00
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func (device *Device) RoutineEncryption() {
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2017-07-17 14:16:18 +00:00
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2017-06-26 20:07:29 +00:00
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var nonce [chacha20poly1305.NonceSize]byte
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2017-07-17 14:16:18 +00:00
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logDebug := device.log.Debug
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2018-05-01 14:59:13 +00:00
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defer func() {
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logDebug.Println("Routine: encryption worker - stopped")
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2018-05-05 04:09:30 +00:00
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device.state.stopping.Done()
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2018-05-01 14:59:13 +00:00
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}()
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logDebug.Println("Routine: encryption worker - started")
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2017-07-17 14:16:18 +00:00
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for {
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// fetch next element
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select {
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2017-12-01 22:37:26 +00:00
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case <-device.signal.stop.Wait():
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2017-07-17 14:16:18 +00:00
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return
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2017-07-08 21:51:26 +00:00
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2018-05-01 14:59:13 +00:00
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case elem, ok := <-device.queue.encryption:
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if !ok {
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return
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}
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2017-07-08 21:51:26 +00:00
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|
|
2017-09-09 13:03:01 +00:00
|
|
|
// check if dropped
|
|
|
|
|
|
|
|
if elem.IsDropped() {
|
|
|
|
continue
|
|
|
|
}
|
2017-06-28 21:45:45 +00:00
|
|
|
|
2017-09-09 13:03:01 +00:00
|
|
|
// populate header fields
|
2017-07-02 13:28:38 +00:00
|
|
|
|
2017-09-09 13:03:01 +00:00
|
|
|
header := elem.buffer[:MessageTransportHeaderSize]
|
2017-06-26 11:14:02 +00:00
|
|
|
|
2017-09-09 13:03:01 +00:00
|
|
|
fieldType := header[0:4]
|
|
|
|
fieldReceiver := header[4:8]
|
|
|
|
fieldNonce := header[8:16]
|
2017-07-02 13:28:38 +00:00
|
|
|
|
2017-09-09 13:03:01 +00:00
|
|
|
binary.LittleEndian.PutUint32(fieldType, MessageTransportType)
|
|
|
|
binary.LittleEndian.PutUint32(fieldReceiver, elem.keyPair.remoteIndex)
|
|
|
|
binary.LittleEndian.PutUint64(fieldNonce, elem.nonce)
|
2017-07-15 14:27:59 +00:00
|
|
|
|
2017-09-09 13:03:01 +00:00
|
|
|
// pad content to multiple of 16
|
2017-07-15 14:27:59 +00:00
|
|
|
|
2017-09-09 13:03:01 +00:00
|
|
|
mtu := int(atomic.LoadInt32(&device.tun.mtu))
|
|
|
|
rem := len(elem.packet) % PaddingMultiple
|
|
|
|
if rem > 0 {
|
|
|
|
for i := 0; i < PaddingMultiple-rem && len(elem.packet) < mtu; i++ {
|
|
|
|
elem.packet = append(elem.packet, 0)
|
|
|
|
}
|
2017-08-04 14:15:53 +00:00
|
|
|
}
|
2017-07-02 13:28:38 +00:00
|
|
|
|
2017-09-20 07:26:08 +00:00
|
|
|
// encrypt content and release to consumer
|
2017-09-09 13:03:01 +00:00
|
|
|
|
|
|
|
binary.LittleEndian.PutUint64(nonce[4:], elem.nonce)
|
2017-09-20 07:26:08 +00:00
|
|
|
elem.packet = elem.keyPair.send.Seal(
|
|
|
|
header,
|
|
|
|
nonce[:],
|
|
|
|
elem.packet,
|
|
|
|
nil,
|
|
|
|
)
|
2017-09-09 13:03:01 +00:00
|
|
|
elem.mutex.Unlock()
|
|
|
|
}
|
2017-06-28 21:45:45 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Sequentially reads packets from queue and sends to endpoint
|
|
|
|
*
|
|
|
|
* Obs. Single instance per peer.
|
|
|
|
* The routine terminates then the outbound queue is closed.
|
|
|
|
*/
|
2017-06-30 12:41:08 +00:00
|
|
|
func (peer *Peer) RoutineSequentialSender() {
|
2018-01-13 08:00:37 +00:00
|
|
|
|
2017-06-30 12:41:08 +00:00
|
|
|
device := peer.device
|
|
|
|
|
2017-07-08 21:51:26 +00:00
|
|
|
logDebug := device.log.Debug
|
|
|
|
|
2018-04-18 18:29:48 +00:00
|
|
|
defer func() {
|
2018-05-05 00:20:52 +00:00
|
|
|
logDebug.Println(peer, ": Routine: sequential sender - stopped")
|
2018-05-05 04:09:30 +00:00
|
|
|
peer.routines.stopping.Done()
|
2018-04-18 18:29:48 +00:00
|
|
|
}()
|
|
|
|
|
2018-05-05 00:20:52 +00:00
|
|
|
logDebug.Println(peer, ": Routine: sequential sender - started")
|
2018-05-01 14:59:13 +00:00
|
|
|
|
2018-01-13 08:00:37 +00:00
|
|
|
peer.routines.starting.Done()
|
|
|
|
|
2017-06-30 12:41:08 +00:00
|
|
|
for {
|
|
|
|
select {
|
2017-11-30 22:22:40 +00:00
|
|
|
|
2018-01-13 08:00:37 +00:00
|
|
|
case <-peer.routines.stop.Wait():
|
2017-06-30 12:41:08 +00:00
|
|
|
return
|
2017-07-13 12:32:40 +00:00
|
|
|
|
2018-04-18 18:29:48 +00:00
|
|
|
case elem, ok := <-peer.queue.outbound:
|
|
|
|
|
|
|
|
if !ok {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
2017-07-17 14:16:18 +00:00
|
|
|
elem.mutex.Lock()
|
2017-07-27 21:45:37 +00:00
|
|
|
if elem.IsDropped() {
|
|
|
|
continue
|
|
|
|
}
|
2017-07-08 21:51:26 +00:00
|
|
|
|
2017-07-27 21:45:37 +00:00
|
|
|
// send message and return buffer to pool
|
2017-07-14 12:25:18 +00:00
|
|
|
|
2017-07-27 21:45:37 +00:00
|
|
|
length := uint64(len(elem.packet))
|
2017-10-16 19:33:47 +00:00
|
|
|
err := peer.SendBuffer(elem.packet)
|
2017-07-27 21:45:37 +00:00
|
|
|
device.PutMessageBuffer(elem.buffer)
|
|
|
|
if err != nil {
|
2018-05-05 00:20:52 +00:00
|
|
|
logDebug.Println("Failed to send authenticated packet to peer", peer)
|
2017-07-27 21:45:37 +00:00
|
|
|
continue
|
|
|
|
}
|
|
|
|
atomic.AddUint64(&peer.stats.txBytes, length)
|
2017-07-18 13:22:56 +00:00
|
|
|
|
2017-07-27 21:45:37 +00:00
|
|
|
// update timers
|
2017-07-17 14:16:18 +00:00
|
|
|
|
2018-05-05 02:15:07 +00:00
|
|
|
peer.event.anyAuthenticatedPacketTraversal.Fire()
|
2017-07-27 21:45:37 +00:00
|
|
|
if len(elem.packet) != MessageKeepaliveSize {
|
2018-05-05 02:15:07 +00:00
|
|
|
peer.event.dataSent.Fire()
|
2017-07-27 21:45:37 +00:00
|
|
|
}
|
|
|
|
peer.KeepKeyFreshSending()
|
2017-06-30 12:41:08 +00:00
|
|
|
}
|
2017-06-26 11:14:02 +00:00
|
|
|
}
|
|
|
|
}
|