2019-01-02 00:55:51 +00:00
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/* SPDX-License-Identifier: MIT
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2018-05-03 13:04:00 +00:00
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*
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2021-01-28 16:52:15 +00:00
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* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
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2018-05-03 13:04:00 +00:00
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*/
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2019-03-03 03:04:41 +00:00
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package device
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2017-07-01 21:29:22 +00:00
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import (
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"bytes"
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"encoding/binary"
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2021-01-08 13:25:37 +00:00
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"errors"
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2017-07-01 21:29:22 +00:00
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"net"
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"sync"
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"sync/atomic"
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"time"
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2019-05-14 07:09:52 +00:00
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"golang.org/x/crypto/chacha20poly1305"
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"golang.org/x/net/ipv4"
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"golang.org/x/net/ipv6"
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2021-01-08 13:25:37 +00:00
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2019-11-07 16:13:05 +00:00
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"golang.zx2c4.com/wireguard/conn"
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2017-07-01 21:29:22 +00:00
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)
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type QueueHandshakeElement struct {
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2017-10-07 20:35:23 +00:00
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msgType uint32
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packet []byte
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2019-11-07 16:13:05 +00:00
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endpoint conn.Endpoint
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2017-10-07 20:35:23 +00:00
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buffer *[MaxMessageSize]byte
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2017-07-01 21:29:22 +00:00
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}
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type QueueInboundElement struct {
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2019-01-03 18:04:00 +00:00
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sync.Mutex
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2017-11-14 15:27:53 +00:00
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buffer *[MaxMessageSize]byte
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packet []byte
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counter uint64
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2018-05-13 16:23:40 +00:00
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keypair *Keypair
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2019-11-07 16:13:05 +00:00
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endpoint conn.Endpoint
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2017-07-01 21:29:22 +00:00
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}
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2020-12-04 23:36:21 +00:00
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// clearPointers clears elem fields that contain pointers.
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// This makes the garbage collector's life easier and
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// avoids accidentally keeping other objects around unnecessarily.
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// It also reduces the possible collateral damage from use-after-free bugs.
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func (elem *QueueInboundElement) clearPointers() {
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elem.buffer = nil
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elem.packet = nil
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elem.keypair = nil
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elem.endpoint = nil
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}
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2018-05-07 20:27:03 +00:00
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/* Called when a new authenticated message has been received
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*
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* NOTE: Not thread safe, but called by sequential receiver!
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*/
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func (peer *Peer) keepKeyFreshReceiving() {
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2018-05-20 04:50:07 +00:00
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if peer.timers.sentLastMinuteHandshake.Get() {
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2018-05-07 20:27:03 +00:00
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return
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}
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2018-05-13 21:14:43 +00:00
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keypair := peer.keypairs.Current()
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2019-06-03 19:46:46 +00:00
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if keypair != nil && keypair.isInitiator && time.Since(keypair.created) > (RejectAfterTime-KeepaliveTimeout-RekeyTimeout) {
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2018-05-20 04:50:07 +00:00
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peer.timers.sentLastMinuteHandshake.Set(true)
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2018-05-07 20:27:03 +00:00
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peer.SendHandshakeInitiation(false)
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}
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}
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2017-12-01 22:37:26 +00:00
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/* Receives incoming datagrams for the device
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*
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* Every time the bind is updated a new routine is started for
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* IPv4 and IPv6 (separately)
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*/
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2021-03-31 20:55:18 +00:00
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func (device *Device) RoutineReceiveIncoming(recv conn.ReceiveFunc) {
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2021-04-09 23:21:35 +00:00
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recvName := recv.PrettyName()
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2018-05-01 14:59:13 +00:00
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defer func() {
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2021-04-09 23:21:35 +00:00
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device.log.Verbosef("Routine: receive incoming %s - stopped", recvName)
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2021-01-12 01:34:02 +00:00
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device.queue.decryption.wg.Done()
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2021-01-29 17:24:45 +00:00
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device.queue.handshake.wg.Done()
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2018-05-20 04:19:29 +00:00
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device.net.stopping.Done()
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2018-05-01 14:59:13 +00:00
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}()
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2021-04-09 23:21:35 +00:00
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device.log.Verbosef("Routine: receive incoming %s - started", recvName)
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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// receive datagrams until conn is closed
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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buffer := device.GetMessageBuffer()
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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var (
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2021-01-08 13:25:37 +00:00
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err error
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size int
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endpoint conn.Endpoint
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deathSpiral int
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2017-11-30 23:03:06 +00:00
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)
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2017-10-07 20:35:23 +00:00
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2017-11-30 23:03:06 +00:00
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for {
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2021-03-31 20:55:18 +00:00
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size, endpoint, err = recv(buffer[:])
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2017-08-04 14:15:53 +00:00
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2017-11-30 23:03:06 +00:00
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if err != nil {
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2018-09-16 19:50:58 +00:00
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device.PutMessageBuffer(buffer)
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2021-02-16 20:05:25 +00:00
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if errors.Is(err, net.ErrClosed) {
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2021-01-08 13:25:37 +00:00
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return
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}
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2021-05-07 10:21:21 +00:00
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device.log.Verbosef("Failed to receive %s packet: %v", recvName, err)
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2021-03-30 19:36:59 +00:00
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if neterr, ok := err.(net.Error); ok && !neterr.Temporary() {
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return
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}
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2021-01-08 13:25:37 +00:00
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if deathSpiral < 10 {
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deathSpiral++
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time.Sleep(time.Second / 3)
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2021-04-12 11:50:58 +00:00
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buffer = device.GetMessageBuffer()
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2021-01-08 13:25:37 +00:00
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continue
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}
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2017-11-30 23:03:06 +00:00
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return
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}
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2021-01-08 13:25:37 +00:00
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deathSpiral = 0
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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if size < MinMessageSize {
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continue
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}
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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// check size of packet
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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packet := buffer[:size]
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msgType := binary.LittleEndian.Uint32(packet[:4])
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2017-08-04 14:15:53 +00:00
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2017-11-30 23:03:06 +00:00
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var okay bool
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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switch msgType {
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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// check if transport
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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case MessageTransportType:
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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// check size
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2017-07-01 21:29:22 +00:00
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2018-09-20 12:28:53 +00:00
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if len(packet) < MessageTransportSize {
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2017-11-30 23:03:06 +00:00
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continue
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}
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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// lookup key pair
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2017-08-07 13:25:04 +00:00
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2017-11-30 23:03:06 +00:00
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receiver := binary.LittleEndian.Uint32(
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packet[MessageTransportOffsetReceiver:MessageTransportOffsetCounter],
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)
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2018-05-13 16:23:40 +00:00
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value := device.indexTable.Lookup(receiver)
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keypair := value.keypair
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if keypair == nil {
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2017-11-30 23:03:06 +00:00
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continue
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}
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2017-07-01 21:29:22 +00:00
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2018-05-13 17:50:58 +00:00
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// check keypair expiry
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2017-07-01 21:29:22 +00:00
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2018-05-13 16:23:40 +00:00
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if keypair.created.Add(RejectAfterTime).Before(time.Now()) {
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2017-11-30 23:03:06 +00:00
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continue
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}
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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// create work element
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peer := value.peer
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2018-09-22 04:29:02 +00:00
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elem := device.GetInboundElement()
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elem.packet = packet
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elem.buffer = buffer
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elem.keypair = keypair
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elem.endpoint = endpoint
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elem.counter = 0
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2019-01-03 18:04:00 +00:00
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elem.Mutex = sync.Mutex{}
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elem.Lock()
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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// add to decryption queues
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2018-01-26 21:52:32 +00:00
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if peer.isRunning.Get() {
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2021-02-09 14:09:50 +00:00
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peer.queue.inbound.c <- elem
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2021-01-12 01:21:16 +00:00
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device.queue.decryption.c <- elem
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buffer = device.GetMessageBuffer()
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2020-12-22 17:52:53 +00:00
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} else {
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device.PutInboundElement(elem)
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2018-01-26 21:52:32 +00:00
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}
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2017-11-30 23:03:06 +00:00
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continue
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2017-07-01 21:29:22 +00:00
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2017-11-30 23:03:06 +00:00
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// otherwise it is a fixed size & handshake related packet
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2017-08-07 13:25:04 +00:00
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2017-11-30 23:03:06 +00:00
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case MessageInitiationType:
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okay = len(packet) == MessageInitiationSize
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2017-08-07 13:25:04 +00:00
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2017-11-30 23:03:06 +00:00
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case MessageResponseType:
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okay = len(packet) == MessageResponseSize
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2017-08-07 13:25:04 +00:00
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2017-11-30 23:03:06 +00:00
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case MessageCookieReplyType:
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okay = len(packet) == MessageCookieReplySize
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2018-05-05 00:20:52 +00:00
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default:
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2021-01-26 22:05:48 +00:00
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device.log.Verbosef("Received message with unknown type")
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2017-11-30 23:03:06 +00:00
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}
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2017-08-07 13:25:04 +00:00
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2017-11-30 23:03:06 +00:00
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if okay {
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2021-01-29 17:24:45 +00:00
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select {
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case device.queue.handshake.c <- QueueHandshakeElement{
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msgType: msgType,
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buffer: buffer,
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packet: packet,
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endpoint: endpoint,
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}:
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2018-09-16 19:50:58 +00:00
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buffer = device.GetMessageBuffer()
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2021-01-29 17:24:45 +00:00
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default:
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2018-09-16 19:50:58 +00:00
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}
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2017-08-07 13:25:04 +00:00
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}
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2017-07-01 21:29:22 +00:00
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}
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}
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2021-05-07 10:21:21 +00:00
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func (device *Device) RoutineDecryption(id int) {
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2017-07-01 21:29:22 +00:00
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var nonce [chacha20poly1305.NonceSize]byte
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2021-01-19 19:10:05 +00:00
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2021-05-07 10:21:21 +00:00
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defer device.log.Verbosef("Routine: decryption worker %d - stopped", id)
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device.log.Verbosef("Routine: decryption worker %d - started", id)
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2017-07-06 13:43:55 +00:00
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2021-01-12 01:34:02 +00:00
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for elem := range device.queue.decryption.c {
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// split message into fields
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counter := elem.packet[MessageTransportOffsetCounter:MessageTransportOffsetContent]
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content := elem.packet[MessageTransportOffsetContent:]
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2017-09-09 13:03:01 +00:00
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2021-01-12 01:34:02 +00:00
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// decrypt and release to consumer
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var err error
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elem.counter = binary.LittleEndian.Uint64(counter)
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// copy counter to nonce
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binary.LittleEndian.PutUint64(nonce[0x4:0xc], elem.counter)
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elem.packet, err = elem.keypair.receive.Open(
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content[:0],
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nonce[:],
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content,
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nil,
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)
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if err != nil {
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2021-01-17 17:49:39 +00:00
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elem.packet = nil
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2017-07-01 21:29:22 +00:00
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}
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2021-01-12 01:34:02 +00:00
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elem.Unlock()
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2017-07-01 21:29:22 +00:00
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}
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}
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2017-12-01 22:37:26 +00:00
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/* Handles incoming packets related to handshake
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2017-07-01 21:29:22 +00:00
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*/
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2021-05-07 10:21:21 +00:00
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func (device *Device) RoutineHandshake(id int) {
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2021-02-09 18:26:45 +00:00
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defer func() {
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2021-05-07 10:21:21 +00:00
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device.log.Verbosef("Routine: handshake worker %d - stopped", id)
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2021-02-09 18:26:45 +00:00
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device.queue.encryption.wg.Done()
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}()
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2021-05-07 10:21:21 +00:00
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device.log.Verbosef("Routine: handshake worker %d - started", id)
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2017-07-01 21:29:22 +00:00
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2021-01-29 17:24:45 +00:00
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for elem := range device.queue.handshake.c {
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2018-05-01 14:59:13 +00:00
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2017-08-07 13:25:04 +00:00
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// handle cookie fields and ratelimiting
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2017-07-01 21:29:22 +00:00
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2017-08-07 13:25:04 +00:00
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switch elem.msgType {
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2017-07-08 07:23:10 +00:00
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2017-08-07 13:25:04 +00:00
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case MessageCookieReplyType:
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2017-08-14 15:09:25 +00:00
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// unmarshal packet
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2017-08-07 13:25:04 +00:00
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var reply MessageCookieReply
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reader := bytes.NewReader(elem.packet)
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err := binary.Read(reader, binary.LittleEndian, &reply)
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if err != nil {
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2021-01-26 22:05:48 +00:00
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device.log.Verbosef("Failed to decode cookie reply")
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2021-01-29 17:24:45 +00:00
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goto skip
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2017-07-08 07:23:10 +00:00
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}
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2017-08-14 15:09:25 +00:00
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2018-01-26 21:52:32 +00:00
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// lookup peer from index
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2017-08-14 15:09:25 +00:00
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2018-05-13 16:23:40 +00:00
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entry := device.indexTable.Lookup(reply.Receiver)
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2018-01-26 21:52:32 +00:00
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2017-08-14 15:09:25 +00:00
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if entry.peer == nil {
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2021-01-29 17:24:45 +00:00
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goto skip
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2017-08-14 15:09:25 +00:00
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}
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2018-01-26 21:52:32 +00:00
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// consume reply
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if peer := entry.peer; peer.isRunning.Get() {
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2021-01-26 22:05:48 +00:00
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device.log.Verbosef("Receiving cookie response from %s", elem.endpoint.DstToString())
|
2018-12-18 23:35:53 +00:00
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if !peer.cookieGenerator.ConsumeReply(&reply) {
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2021-01-26 22:05:48 +00:00
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device.log.Verbosef("Could not decrypt invalid cookie response")
|
2018-12-18 23:35:53 +00:00
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}
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2018-01-26 21:52:32 +00:00
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}
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2021-01-29 17:24:45 +00:00
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goto skip
|
2017-07-08 07:23:10 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
case MessageInitiationType, MessageResponseType:
|
2017-07-08 07:23:10 +00:00
|
|
|
|
2018-05-13 21:14:43 +00:00
|
|
|
// check mac fields and maybe ratelimit
|
2017-07-08 07:23:10 +00:00
|
|
|
|
2018-05-13 21:14:43 +00:00
|
|
|
if !device.cookieChecker.CheckMAC1(elem.packet) {
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Verbosef("Received packet with invalid mac1")
|
2021-01-29 17:24:45 +00:00
|
|
|
goto skip
|
2017-07-08 07:23:10 +00:00
|
|
|
}
|
|
|
|
|
2017-11-17 16:25:45 +00:00
|
|
|
// endpoints destination address is the source of the datagram
|
|
|
|
|
2017-08-11 14:18:20 +00:00
|
|
|
if device.IsUnderLoad() {
|
2017-10-08 20:03:32 +00:00
|
|
|
|
|
|
|
// verify MAC2 field
|
|
|
|
|
2018-05-13 21:14:43 +00:00
|
|
|
if !device.cookieChecker.CheckMAC2(elem.packet, elem.endpoint.DstToBytes()) {
|
|
|
|
device.SendHandshakeCookie(&elem)
|
2021-01-29 17:24:45 +00:00
|
|
|
goto skip
|
2017-08-07 13:25:04 +00:00
|
|
|
}
|
2017-08-11 14:18:20 +00:00
|
|
|
|
2017-10-08 20:03:32 +00:00
|
|
|
// check ratelimiter
|
|
|
|
|
2018-02-02 15:40:14 +00:00
|
|
|
if !device.rate.limiter.Allow(elem.endpoint.DstIP()) {
|
2021-01-29 17:24:45 +00:00
|
|
|
goto skip
|
2017-08-07 13:25:04 +00:00
|
|
|
}
|
2017-07-11 16:48:29 +00:00
|
|
|
}
|
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
default:
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Errorf("Invalid packet ended up in the handshake queue")
|
2021-01-29 17:24:45 +00:00
|
|
|
goto skip
|
2017-08-07 13:25:04 +00:00
|
|
|
}
|
2017-07-08 07:23:10 +00:00
|
|
|
|
2017-12-01 22:37:26 +00:00
|
|
|
// handle handshake initiation/response content
|
2017-07-01 21:29:22 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
switch elem.msgType {
|
|
|
|
case MessageInitiationType:
|
2017-07-01 21:29:22 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
// unmarshal
|
2017-07-01 21:29:22 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
var msg MessageInitiation
|
|
|
|
reader := bytes.NewReader(elem.packet)
|
|
|
|
err := binary.Read(reader, binary.LittleEndian, &msg)
|
|
|
|
if err != nil {
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Errorf("Failed to decode initiation message")
|
2021-01-29 17:24:45 +00:00
|
|
|
goto skip
|
2017-08-07 13:25:04 +00:00
|
|
|
}
|
2017-07-01 21:29:22 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
// consume initiation
|
2017-07-01 21:29:22 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
peer := device.ConsumeMessageInitiation(&msg)
|
|
|
|
if peer == nil {
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Verbosef("Received invalid initiation message from %s", elem.endpoint.DstToString())
|
2021-01-29 17:24:45 +00:00
|
|
|
goto skip
|
2017-08-07 13:25:04 +00:00
|
|
|
}
|
2017-08-04 14:15:53 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
// update timers
|
2017-08-04 14:15:53 +00:00
|
|
|
|
2018-05-07 20:27:03 +00:00
|
|
|
peer.timersAnyAuthenticatedPacketTraversal()
|
|
|
|
peer.timersAnyAuthenticatedPacketReceived()
|
2017-07-07 11:47:09 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
// update endpoint
|
2018-05-26 00:59:26 +00:00
|
|
|
peer.SetEndpointFromPacket(elem.endpoint)
|
2017-07-13 19:29:22 +00:00
|
|
|
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Verbosef("%v - Received handshake initiation", peer)
|
2019-06-11 16:13:52 +00:00
|
|
|
atomic.AddUint64(&peer.stats.rxBytes, uint64(len(elem.packet)))
|
2018-04-20 05:13:40 +00:00
|
|
|
|
2018-05-13 21:14:43 +00:00
|
|
|
peer.SendHandshakeResponse()
|
2017-07-14 12:25:18 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
case MessageResponseType:
|
2017-07-01 21:29:22 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
// unmarshal
|
2017-07-01 21:29:22 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
var msg MessageResponse
|
|
|
|
reader := bytes.NewReader(elem.packet)
|
|
|
|
err := binary.Read(reader, binary.LittleEndian, &msg)
|
|
|
|
if err != nil {
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Errorf("Failed to decode response message")
|
2021-01-29 17:24:45 +00:00
|
|
|
goto skip
|
2017-08-07 13:25:04 +00:00
|
|
|
}
|
2017-07-01 21:29:22 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
// consume response
|
2017-07-01 21:29:22 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
peer := device.ConsumeMessageResponse(&msg)
|
|
|
|
if peer == nil {
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Verbosef("Received invalid response message from %s", elem.endpoint.DstToString())
|
2021-01-29 17:24:45 +00:00
|
|
|
goto skip
|
2017-08-07 13:25:04 +00:00
|
|
|
}
|
2017-07-27 21:45:37 +00:00
|
|
|
|
2017-11-14 15:27:53 +00:00
|
|
|
// update endpoint
|
2018-05-26 00:59:26 +00:00
|
|
|
peer.SetEndpointFromPacket(elem.endpoint)
|
2017-11-14 15:27:53 +00:00
|
|
|
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Verbosef("%v - Received handshake response", peer)
|
2019-06-11 16:13:52 +00:00
|
|
|
atomic.AddUint64(&peer.stats.rxBytes, uint64(len(elem.packet)))
|
2017-09-20 07:26:08 +00:00
|
|
|
|
2017-08-07 13:25:04 +00:00
|
|
|
// update timers
|
2017-08-04 14:15:53 +00:00
|
|
|
|
2018-05-07 20:27:03 +00:00
|
|
|
peer.timersAnyAuthenticatedPacketTraversal()
|
|
|
|
peer.timersAnyAuthenticatedPacketReceived()
|
2017-08-04 14:15:53 +00:00
|
|
|
|
2018-05-13 17:50:58 +00:00
|
|
|
// derive keypair
|
2017-07-01 21:29:22 +00:00
|
|
|
|
2018-05-13 21:14:43 +00:00
|
|
|
err = peer.BeginSymmetricSession()
|
|
|
|
|
|
|
|
if err != nil {
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Errorf("%v - Failed to derive keypair: %v", peer, err)
|
2021-01-29 17:24:45 +00:00
|
|
|
goto skip
|
2018-05-07 20:27:03 +00:00
|
|
|
}
|
|
|
|
|
2018-05-13 21:14:43 +00:00
|
|
|
peer.timersSessionDerived()
|
2018-05-07 20:27:03 +00:00
|
|
|
peer.timersHandshakeComplete()
|
|
|
|
peer.SendKeepalive()
|
2017-08-07 13:25:04 +00:00
|
|
|
}
|
2021-01-29 17:24:45 +00:00
|
|
|
skip:
|
|
|
|
device.PutMessageBuffer(elem.buffer)
|
2017-07-01 21:29:22 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
func (peer *Peer) RoutineSequentialReceiver() {
|
|
|
|
device := peer.device
|
2018-04-18 18:29:48 +00:00
|
|
|
defer func() {
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Verbosef("%v - Routine: sequential receiver - stopped", peer)
|
2021-01-29 13:54:11 +00:00
|
|
|
peer.stopping.Done()
|
2018-02-04 18:18:44 +00:00
|
|
|
}()
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Verbosef("%v - Routine: sequential receiver - started", peer)
|
2018-02-02 15:40:14 +00:00
|
|
|
|
2021-02-09 14:09:50 +00:00
|
|
|
for elem := range peer.queue.inbound.c {
|
2021-02-08 21:02:52 +00:00
|
|
|
if elem == nil {
|
|
|
|
return
|
|
|
|
}
|
2021-01-29 13:54:11 +00:00
|
|
|
var err error
|
2019-03-21 20:43:04 +00:00
|
|
|
elem.Lock()
|
2021-01-17 17:49:39 +00:00
|
|
|
if elem.packet == nil {
|
|
|
|
// decryption failed
|
2021-01-29 13:54:11 +00:00
|
|
|
goto skip
|
2019-03-21 20:43:04 +00:00
|
|
|
}
|
2017-07-10 10:09:19 +00:00
|
|
|
|
2019-03-21 20:43:04 +00:00
|
|
|
if !elem.keypair.replayFilter.ValidateCounter(elem.counter, RejectAfterMessages) {
|
2021-01-29 13:54:11 +00:00
|
|
|
goto skip
|
2019-03-21 20:43:04 +00:00
|
|
|
}
|
2017-07-08 21:51:26 +00:00
|
|
|
|
2019-03-21 20:43:04 +00:00
|
|
|
peer.SetEndpointFromPacket(elem.endpoint)
|
|
|
|
if peer.ReceivedWithKeypair(elem.keypair) {
|
|
|
|
peer.timersHandshakeComplete()
|
2021-01-27 17:13:53 +00:00
|
|
|
peer.SendStagedPackets()
|
2019-03-21 20:43:04 +00:00
|
|
|
}
|
2017-07-01 21:29:22 +00:00
|
|
|
|
2019-03-21 20:43:04 +00:00
|
|
|
peer.keepKeyFreshReceiving()
|
|
|
|
peer.timersAnyAuthenticatedPacketTraversal()
|
|
|
|
peer.timersAnyAuthenticatedPacketReceived()
|
2019-06-11 16:13:52 +00:00
|
|
|
atomic.AddUint64(&peer.stats.rxBytes, uint64(len(elem.packet)+MinMessageSize))
|
2017-07-01 21:29:22 +00:00
|
|
|
|
2019-03-21 20:43:04 +00:00
|
|
|
if len(elem.packet) == 0 {
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Verbosef("%v - Receiving keepalive packet", peer)
|
2021-01-29 13:54:11 +00:00
|
|
|
goto skip
|
2019-03-21 20:43:04 +00:00
|
|
|
}
|
|
|
|
peer.timersDataReceived()
|
2017-07-08 07:23:10 +00:00
|
|
|
|
2019-03-21 20:43:04 +00:00
|
|
|
switch elem.packet[0] >> 4 {
|
|
|
|
case ipv4.Version:
|
|
|
|
if len(elem.packet) < ipv4.HeaderLen {
|
2021-01-29 13:54:11 +00:00
|
|
|
goto skip
|
2019-03-21 20:43:04 +00:00
|
|
|
}
|
|
|
|
field := elem.packet[IPv4offsetTotalLength : IPv4offsetTotalLength+2]
|
|
|
|
length := binary.BigEndian.Uint16(field)
|
|
|
|
if int(length) > len(elem.packet) || int(length) < ipv4.HeaderLen {
|
2021-01-29 13:54:11 +00:00
|
|
|
goto skip
|
2019-03-21 20:43:04 +00:00
|
|
|
}
|
|
|
|
elem.packet = elem.packet[:length]
|
|
|
|
src := elem.packet[IPv4offsetSrc : IPv4offsetSrc+net.IPv4len]
|
|
|
|
if device.allowedips.LookupIPv4(src) != peer {
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Verbosef("IPv4 packet with disallowed source address from %v", peer)
|
2021-01-29 13:54:11 +00:00
|
|
|
goto skip
|
2019-03-21 20:43:04 +00:00
|
|
|
}
|
2017-07-07 11:47:09 +00:00
|
|
|
|
2019-03-21 20:43:04 +00:00
|
|
|
case ipv6.Version:
|
|
|
|
if len(elem.packet) < ipv6.HeaderLen {
|
2021-01-29 13:54:11 +00:00
|
|
|
goto skip
|
2019-03-21 20:43:04 +00:00
|
|
|
}
|
|
|
|
field := elem.packet[IPv6offsetPayloadLength : IPv6offsetPayloadLength+2]
|
|
|
|
length := binary.BigEndian.Uint16(field)
|
|
|
|
length += ipv6.HeaderLen
|
|
|
|
if int(length) > len(elem.packet) {
|
2021-01-29 13:54:11 +00:00
|
|
|
goto skip
|
2019-03-21 20:43:04 +00:00
|
|
|
}
|
|
|
|
elem.packet = elem.packet[:length]
|
|
|
|
src := elem.packet[IPv6offsetSrc : IPv6offsetSrc+net.IPv6len]
|
|
|
|
if device.allowedips.LookupIPv6(src) != peer {
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Verbosef("IPv6 packet with disallowed source address from %v", peer)
|
2021-01-29 13:54:11 +00:00
|
|
|
goto skip
|
2017-08-07 13:25:04 +00:00
|
|
|
}
|
2017-07-13 12:32:40 +00:00
|
|
|
|
2019-03-21 20:43:04 +00:00
|
|
|
default:
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Verbosef("Packet with invalid IP version from %v", peer)
|
2021-01-29 13:54:11 +00:00
|
|
|
goto skip
|
2019-03-21 20:43:04 +00:00
|
|
|
}
|
|
|
|
|
2021-01-29 13:54:11 +00:00
|
|
|
_, err = device.tun.device.Write(elem.buffer[:MessageTransportOffsetContent+len(elem.packet)], MessageTransportOffsetContent)
|
2021-01-19 17:02:16 +00:00
|
|
|
if err != nil && !device.isClosed() {
|
2021-01-26 22:05:48 +00:00
|
|
|
device.log.Errorf("Failed to write packet to TUN device: %v", err)
|
2020-09-21 22:17:16 +00:00
|
|
|
}
|
2021-02-09 14:09:50 +00:00
|
|
|
if len(peer.queue.inbound.c) == 0 {
|
2021-01-29 13:54:11 +00:00
|
|
|
err = device.tun.device.Flush()
|
2019-07-01 13:23:24 +00:00
|
|
|
if err != nil {
|
2021-01-26 22:05:48 +00:00
|
|
|
peer.device.log.Errorf("Unable to flush packets: %v", err)
|
2019-07-01 13:23:24 +00:00
|
|
|
}
|
2019-03-21 20:43:04 +00:00
|
|
|
}
|
2021-01-29 13:54:11 +00:00
|
|
|
skip:
|
|
|
|
device.PutMessageBuffer(elem.buffer)
|
|
|
|
device.PutInboundElement(elem)
|
2017-07-01 21:29:22 +00:00
|
|
|
}
|
|
|
|
}
|