1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
package main
import (
"errors"
"fmt"
"net"
"runtime"
"sync"
"sync/atomic"
"time"
)
type Device struct {
mtu int32
tun TUNDevice
log *Logger // collection of loggers for levels
idCounter uint // for assigning debug ids to peers
fwMark uint32
pool struct {
// pools objects for reuse
messageBuffers sync.Pool
}
net struct {
// seperate for performance reasons
mutex sync.RWMutex
addr *net.UDPAddr // UDP source address
conn *net.UDPConn // UDP "connection"
}
mutex sync.RWMutex
privateKey NoisePrivateKey
publicKey NoisePublicKey
routingTable RoutingTable
indices IndexTable
queue struct {
encryption chan *QueueOutboundElement
decryption chan *QueueInboundElement
inbound chan *QueueInboundElement
handshake chan QueueHandshakeElement
}
signal struct {
stop chan struct{}
}
underLoad int32 // used as an atomic bool
ratelimiter Ratelimiter
peers map[NoisePublicKey]*Peer
mac MACStateDevice
}
func (device *Device) SetPrivateKey(sk NoisePrivateKey) error {
device.mutex.Lock()
defer device.mutex.Unlock()
// check if public key is matching any peer
publicKey := sk.publicKey()
for _, peer := range device.peers {
h := &peer.handshake
h.mutex.RLock()
if h.remoteStatic.Equals(publicKey) {
h.mutex.RUnlock()
return errors.New("Private key matches public key of peer")
}
h.mutex.RUnlock()
}
// update key material
device.privateKey = sk
device.publicKey = publicKey
device.mac.Init(publicKey)
// do DH precomputations
isZero := device.privateKey.IsZero()
for _, peer := range device.peers {
h := &peer.handshake
h.mutex.Lock()
if isZero {
h.precomputedStaticStatic = [NoisePublicKeySize]byte{}
} else {
h.precomputedStaticStatic = device.privateKey.sharedSecret(h.remoteStatic)
}
fmt.Println(h.precomputedStaticStatic)
h.mutex.Unlock()
}
return nil
}
func (device *Device) GetMessageBuffer() *[MaxMessageSize]byte {
return device.pool.messageBuffers.Get().(*[MaxMessageSize]byte)
}
func (device *Device) PutMessageBuffer(msg *[MaxMessageSize]byte) {
device.pool.messageBuffers.Put(msg)
}
func NewDevice(tun TUNDevice, logLevel int) *Device {
device := new(Device)
device.mutex.Lock()
defer device.mutex.Unlock()
device.tun = tun
device.log = NewLogger(logLevel)
device.peers = make(map[NoisePublicKey]*Peer)
device.indices.Init()
device.ratelimiter.Init()
device.routingTable.Reset()
// listen
device.net.mutex.Lock()
device.net.conn, _ = net.ListenUDP("udp", device.net.addr)
addr := device.net.conn.LocalAddr()
device.net.addr, _ = net.ResolveUDPAddr(addr.Network(), addr.String())
device.net.mutex.Unlock()
// setup pools
device.pool.messageBuffers = sync.Pool{
New: func() interface{} {
return new([MaxMessageSize]byte)
},
}
// create queues
device.queue.handshake = make(chan QueueHandshakeElement, QueueHandshakeSize)
device.queue.encryption = make(chan *QueueOutboundElement, QueueOutboundSize)
device.queue.decryption = make(chan *QueueInboundElement, QueueInboundSize)
device.queue.inbound = make(chan *QueueInboundElement, QueueInboundSize)
// prepare signals
device.signal.stop = make(chan struct{})
// start workers
for i := 0; i < runtime.NumCPU(); i += 1 {
go device.RoutineEncryption()
go device.RoutineDecryption()
go device.RoutineHandshake()
}
go device.RoutineBusyMonitor()
go device.RoutineMTUUpdater()
go device.RoutineWriteToTUN()
go device.RoutineReadFromTUN()
go device.RoutineReceiveIncomming()
go device.ratelimiter.RoutineGarbageCollector(device.signal.stop)
return device
}
func (device *Device) RoutineMTUUpdater() {
logError := device.log.Error
for ; ; time.Sleep(5 * time.Second) {
// load updated MTU
mtu, err := device.tun.MTU()
if err != nil {
logError.Println("Failed to load updated MTU of device:", err)
continue
}
// upper bound of mtu
if mtu+MessageTransportSize > MaxMessageSize {
mtu = MaxMessageSize - MessageTransportSize
}
atomic.StoreInt32(&device.mtu, int32(mtu))
}
}
func (device *Device) LookupPeer(pk NoisePublicKey) *Peer {
device.mutex.RLock()
defer device.mutex.RUnlock()
return device.peers[pk]
}
func (device *Device) RemovePeer(key NoisePublicKey) {
device.mutex.Lock()
defer device.mutex.Unlock()
peer, ok := device.peers[key]
if !ok {
return
}
peer.mutex.Lock()
device.routingTable.RemovePeer(peer)
delete(device.peers, key)
peer.Close()
}
func (device *Device) RemoveAllPeers() {
device.mutex.Lock()
defer device.mutex.Unlock()
for key, peer := range device.peers {
peer.mutex.Lock()
delete(device.peers, key)
peer.Close()
peer.mutex.Unlock()
}
}
func (device *Device) Close() {
device.RemoveAllPeers()
close(device.signal.stop)
}
func (device *Device) WaitChannel() chan struct{} {
return device.signal.stop
}
|