/
net_ifa.go
261 lines (214 loc) · 5.43 KB
/
net_ifa.go
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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
package server
import (
"fmt"
"net"
"sync"
"time"
"github.com/bio-routing/bio-rd/net/ethernet"
"github.com/bio-routing/bio-rd/protocols/device"
btime "github.com/bio-routing/bio-rd/util/time"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
)
var (
allISNetworkEntitiesAddr = ethernet.MACAddr{0x00, 0x2B, 0x00, 0x00, 0x05}
)
// InterfaceConfig represents a network interfaces ISIS config
type InterfaceConfig struct {
Name string
Passive bool
PointToPoint bool
Level1 *InterfaceLevelConfig
Level2 *InterfaceLevelConfig
mock bool
}
// holdingTimer() picks the maximum holding timer from Level1 and Level2 config
func (ifCfg *InterfaceConfig) holdingTimer() uint16 {
if ifCfg.Level1 != nil && ifCfg.Level2 == nil {
return ifCfg.Level1.HoldingTimer
}
if ifCfg.Level2 != nil && ifCfg.Level1 == nil {
return ifCfg.Level2.HoldingTimer
}
if ifCfg.Level1 == nil && ifCfg.Level2 == nil {
return 0
}
if ifCfg.Level1.HoldingTimer > ifCfg.Level2.HoldingTimer {
return ifCfg.Level1.HoldingTimer
}
return ifCfg.Level2.HoldingTimer
}
func (ifCfg *InterfaceConfig) getMinHelloInterval() uint16 {
if ifCfg.Level1 == nil && ifCfg.Level2 == nil {
return 0
}
if ifCfg.Level1 == nil {
return ifCfg.Level2.HelloInterval
}
if ifCfg.Level2 == nil {
return ifCfg.Level1.HelloInterval
}
if ifCfg.Level1.HelloInterval < ifCfg.Level2.HelloInterval {
return ifCfg.Level1.HelloInterval
}
return ifCfg.Level2.HelloInterval
}
// InterfaceLevelConfig is the ISIS level config of an interface
type InterfaceLevelConfig struct {
HelloInterval uint16
HoldingTimer uint16
Metric uint32
Passive bool
Priority uint8
}
type netIfaInterface interface {
start() error
}
type netIfa struct {
name string
srv *Server
cfg *InterfaceConfig
done chan struct{}
wg sync.WaitGroup
helloTicker btime.Ticker
isP2PHelloCon net.Conn
neighborManagerL1 *neighborManager
neighborManagerL2 *neighborManager
mu sync.RWMutex
initialized bool
devStatus device.DeviceInterface
ethHandler ethernet.HandlerInterface
}
func newNetIfa(srv *Server, cfg *InterfaceConfig) *netIfa {
ret := &netIfa{
name: cfg.Name,
srv: srv,
cfg: cfg,
done: make(chan struct{}),
}
if cfg.Level1 != nil {
ret.neighborManagerL1 = newNeighborManager(srv, ret, 1)
}
if cfg.Level2 != nil {
ret.neighborManagerL2 = newNeighborManager(srv, ret, 2)
}
if srv.netIfaManager.useMockTicker {
ret.helloTicker = btime.NewMockTicker()
} else {
ret.helloTicker = btime.NewBIOTicker(time.Duration(cfg.getMinHelloInterval()) * time.Second)
}
srv.ds.Subscribe(ret, cfg.Name)
return ret
}
func (nifa *netIfa) isInitialized() bool {
nifa.mu.Lock()
defer nifa.mu.Unlock()
return nifa.initialized
}
// DeviceUpdate receives device up/down events and other (net)device changes
func (nifa *netIfa) DeviceUpdate(dev device.DeviceInterface) {
nifa.mu.Lock()
defer nifa.mu.Unlock()
oldState := uint8(device.IfOperUnknown)
if nifa.devStatus != nil {
oldState = nifa.devStatus.GetOperState()
}
nifa.devStatus = dev
if oldState != device.IfOperUp && dev.GetOperState() == device.IfOperUp {
log.WithFields(nifa.fields()).Info("Interface changed state to operational. Enabling IS-IS")
err := nifa._start()
if err != nil {
log.Errorf("Unable to start ISIS on interface %s: %v", nifa.name, err)
}
return
}
if oldState == device.IfOperUp && dev.GetOperState() != device.IfOperUp {
log.WithFields(nifa.fields()).Info("Interface changed state to down. Disabling IS-IS")
nifa._stop()
return
}
}
func (nifa *netIfa) fields() log.Fields {
return log.Fields{
"protocol": "IS-IS",
"component": "Interface",
"interface": nifa.name,
}
}
func (nifa *netIfa) _start() error {
log.WithFields(nifa.fields()).Info("Starting ISIS")
if nifa.initialized {
return fmt.Errorf("already running")
}
if nifa.cfg.Passive {
return nil
}
if nifa.cfg.mock {
nifa.ethHandler = ethernet.NewMockHandler()
} else {
ethHandler, err := ethernet.NewHandler(nifa.name, getISISBPF(), getISISLLC())
if err != nil {
return errors.Wrapf(err, "Unable to create ethernet handler (%s)", nifa.name)
}
nifa.ethHandler = ethHandler
}
nifa.isP2PHelloCon = nifa.ethHandler.NewConn(allISNetworkEntitiesAddr)
nifa.wg.Add(1)
go nifa.p2pHelloSender()
err := nifa.ethHandler.MCastJoin(allISNetworkEntitiesAddr)
if err != nil {
nifa._stop()
return errors.Wrap(err, "Unable to join IS p2p hello multicast group")
}
nifa.wg.Add(1)
go nifa.receiver()
nifa.initialized = true
return nil
}
func (nifa *netIfa) _stop() {
if nifa.neighborManagerL1 != nil {
nifa.neighborManagerL1.netDown()
}
if nifa.neighborManagerL2 != nil {
nifa.neighborManagerL2.netDown()
}
close(nifa.done)
nifa.ethHandler.Close()
nifa.wg.Wait()
}
func getISISLLC() ethernet.LLC {
return ethernet.LLC{
DSAP: 0xfe,
SSAP: 0xfe,
ControlField: 0x03,
}
}
func getISISBPF() *ethernet.BPF {
b := ethernet.NewBPF()
b.AddTerm(ethernet.BPFTerm{
Code: 0x28,
K: 0x0000000e - 14,
})
b.AddTerm(ethernet.BPFTerm{
Code: 0x15,
Jf: 3,
K: 0x0000fefe,
})
b.AddTerm(ethernet.BPFTerm{
Code: 0x30,
K: 0x00000011 - 14,
})
b.AddTerm(ethernet.BPFTerm{
Code: 0x15,
Jf: 1,
K: 0x00000083,
})
b.AddTerm(ethernet.BPFTerm{
Code: 0x6,
K: 0x00040000,
})
b.AddTerm(ethernet.BPFTerm{
Code: 0x6,
})
return b
}