File: conntrack_test.go

package info (click to toggle)
golang-github-vishvananda-netlink 1.0.0+git20181030.023a6da-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 928 kB
  • sloc: makefile: 25
file content (407 lines) | stat: -rw-r--r-- 11,916 bytes parent folder | download
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
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
// +build linux

package netlink

import (
	"fmt"
	"net"
	"runtime"
	"testing"

	"github.com/vishvananda/netns"
	"golang.org/x/sys/unix"
)

func CheckErrorFail(t *testing.T, err error) {
	if err != nil {
		t.Fatalf("Fatal Error: %s", err)
	}
}
func CheckError(t *testing.T, err error) {
	if err != nil {
		t.Errorf("Error: %s", err)
	}
}

func udpFlowCreateProg(t *testing.T, flows, srcPort int, dstIP string, dstPort int) {
	for i := 0; i < flows; i++ {
		ServerAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", dstIP, dstPort))
		CheckError(t, err)

		LocalAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("127.0.0.1:%d", srcPort+i))
		CheckError(t, err)

		Conn, err := net.DialUDP("udp", LocalAddr, ServerAddr)
		CheckError(t, err)

		Conn.Write([]byte("Hello World"))
		Conn.Close()
	}
}

func nsCreateAndEnter(t *testing.T) (*netns.NsHandle, *netns.NsHandle, *Handle) {
	// Lock the OS Thread so we don't accidentally switch namespaces
	runtime.LockOSThread()

	// Save the current network namespace
	origns, _ := netns.Get()

	ns, err := netns.New()
	CheckErrorFail(t, err)

	h, err := NewHandleAt(ns)
	CheckErrorFail(t, err)

	// Enter the new namespace
	netns.Set(ns)

	// Bing up loopback
	link, _ := h.LinkByName("lo")
	h.LinkSetUp(link)

	return &origns, &ns, h
}

func applyFilter(flowList []ConntrackFlow, ipv4Filter *ConntrackFilter, ipv6Filter *ConntrackFilter) (ipv4Match, ipv6Match uint) {
	for _, flow := range flowList {
		if ipv4Filter.MatchConntrackFlow(&flow) == true {
			ipv4Match++
		}
		if ipv6Filter.MatchConntrackFlow(&flow) == true {
			ipv6Match++
		}
	}
	return ipv4Match, ipv6Match
}

// TestConntrackSocket test the opening of a NETFILTER family socket
func TestConntrackSocket(t *testing.T) {
	skipUnlessRoot(t)
	setUpNetlinkTestWithKModule(t, "nf_conntrack")
	setUpNetlinkTestWithKModule(t, "nf_conntrack_netlink")

	h, err := NewHandle(unix.NETLINK_NETFILTER)
	CheckErrorFail(t, err)

	if h.SupportsNetlinkFamily(unix.NETLINK_NETFILTER) != true {
		t.Fatal("ERROR not supporting the NETFILTER family")
	}
}

// TestConntrackTableList test the conntrack table list
// Creates some flows and checks that they are correctly fetched from the conntrack table
func TestConntrackTableList(t *testing.T) {
	skipUnlessRoot(t)
	setUpNetlinkTestWithKModule(t, "nf_conntrack")
	setUpNetlinkTestWithKModule(t, "nf_conntrack_netlink")
	setUpNetlinkTestWithKModule(t, "nf_conntrack_ipv4")
	setUpNetlinkTestWithKModule(t, "nf_conntrack_ipv6")

	// Creates a new namespace and bring up the loopback interface
	origns, ns, h := nsCreateAndEnter(t)
	defer netns.Set(*origns)
	defer origns.Close()
	defer ns.Close()
	defer runtime.UnlockOSThread()

	setUpF(t, "/proc/sys/net/netfilter/nf_conntrack_acct", "1")

	// Flush the table to start fresh
	err := h.ConntrackTableFlush(ConntrackTable)
	CheckErrorFail(t, err)

	// Create 5 udp
	udpFlowCreateProg(t, 5, 2000, "127.0.0.10", 3000)

	// Fetch the conntrack table
	flows, err := h.ConntrackTableList(ConntrackTable, unix.AF_INET)
	CheckErrorFail(t, err)

	// Check that it is able to find the 5 flows created
	var found int
	for _, flow := range flows {
		if flow.Forward.Protocol == 17 &&
			flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.10")) &&
			flow.Forward.DstPort == 3000 &&
			(flow.Forward.SrcPort >= 2000 && flow.Forward.SrcPort <= 2005) {
			found++
		}

		if flow.Forward.Bytes == 0 && flow.Forward.Packets == 0 && flow.Reverse.Bytes == 0 && flow.Reverse.Packets == 0 {
			t.Error("No traffic statistics are collected")
		}
	}
	if found != 5 {
		t.Fatalf("Found only %d flows over 5", found)
	}

	// Give a try also to the IPv6 version
	_, err = h.ConntrackTableList(ConntrackTable, unix.AF_INET6)
	CheckErrorFail(t, err)

	// Switch back to the original namespace
	netns.Set(*origns)
}

// TestConntrackTableFlush test the conntrack table flushing
// Creates some flows and then call the table flush
func TestConntrackTableFlush(t *testing.T) {
	skipUnlessRoot(t)
	setUpNetlinkTestWithKModule(t, "nf_conntrack")
	setUpNetlinkTestWithKModule(t, "nf_conntrack_netlink")
	setUpNetlinkTestWithKModule(t, "nf_conntrack_ipv4")

	// Creates a new namespace and bring up the loopback interface
	origns, ns, h := nsCreateAndEnter(t)
	defer netns.Set(*origns)
	defer origns.Close()
	defer ns.Close()
	defer runtime.UnlockOSThread()

	// Create 5 udp flows using netcat
	udpFlowCreateProg(t, 5, 3000, "127.0.0.10", 4000)

	// Fetch the conntrack table
	flows, err := h.ConntrackTableList(ConntrackTable, unix.AF_INET)
	CheckErrorFail(t, err)

	// Check that it is able to find the 5 flows created
	var found int
	for _, flow := range flows {
		if flow.Forward.Protocol == 17 &&
			flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.10")) &&
			flow.Forward.DstPort == 4000 &&
			(flow.Forward.SrcPort >= 3000 && flow.Forward.SrcPort <= 3005) {
			found++
		}
	}
	if found != 5 {
		t.Fatalf("Found only %d flows over 5", found)
	}

	// Flush the table
	err = h.ConntrackTableFlush(ConntrackTable)
	CheckErrorFail(t, err)

	// Fetch again the flows to validate the flush
	flows, err = h.ConntrackTableList(ConntrackTable, unix.AF_INET)
	CheckErrorFail(t, err)

	// Check if it is still able to find the 5 flows created
	found = 0
	for _, flow := range flows {
		if flow.Forward.Protocol == 17 &&
			flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.10")) &&
			flow.Forward.DstPort == 4000 &&
			(flow.Forward.SrcPort >= 3000 && flow.Forward.SrcPort <= 3005) {
			found++
		}
	}
	if found > 0 {
		t.Fatalf("Found %d flows, they should had been flushed", found)
	}

	// Switch back to the original namespace
	netns.Set(*origns)
}

// TestConntrackTableDelete tests the deletion with filter
// Creates 2 group of flows then deletes only one group and validates the result
func TestConntrackTableDelete(t *testing.T) {
	skipUnlessRoot(t)
	setUpNetlinkTestWithKModule(t, "nf_conntrack")
	setUpNetlinkTestWithKModule(t, "nf_conntrack_netlink")
	setUpNetlinkTestWithKModule(t, "nf_conntrack_ipv4")

	// Creates a new namespace and bring up the loopback interface
	origns, ns, h := nsCreateAndEnter(t)
	defer netns.Set(*origns)
	defer origns.Close()
	defer ns.Close()
	defer runtime.UnlockOSThread()

	// Create 10 udp flows
	udpFlowCreateProg(t, 5, 5000, "127.0.0.10", 6000)
	udpFlowCreateProg(t, 5, 7000, "127.0.0.20", 8000)

	// Fetch the conntrack table
	flows, err := h.ConntrackTableList(ConntrackTable, unix.AF_INET)
	CheckErrorFail(t, err)

	// Check that it is able to find the 5 flows created for each group
	var groupA int
	var groupB int
	for _, flow := range flows {
		if flow.Forward.Protocol == 17 &&
			flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.10")) &&
			flow.Forward.DstPort == 6000 &&
			(flow.Forward.SrcPort >= 5000 && flow.Forward.SrcPort <= 5005) {
			groupA++
		}
		if flow.Forward.Protocol == 17 &&
			flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.20")) &&
			flow.Forward.DstPort == 8000 &&
			(flow.Forward.SrcPort >= 7000 && flow.Forward.SrcPort <= 7005) {
			groupB++
		}
	}
	if groupA != 5 || groupB != 5 {
		t.Fatalf("Flow creation issue groupA:%d, groupB:%d", groupA, groupB)
	}

	// Create a filter to erase groupB flows
	filter := &ConntrackFilter{}
	filter.AddIP(ConntrackOrigDstIP, net.ParseIP("127.0.0.20"))

	// Flush entries of groupB
	var deleted uint
	if deleted, err = h.ConntrackDeleteFilter(ConntrackTable, unix.AF_INET, filter); err != nil {
		t.Fatalf("Error during the erase: %s", err)
	}
	if deleted != 5 {
		t.Fatalf("Error deleted a wrong number of flows:%d instead of 5", deleted)
	}

	// Check again the table to verify that are gone
	flows, err = h.ConntrackTableList(ConntrackTable, unix.AF_INET)
	CheckErrorFail(t, err)

	// Check if it is able to find the 5 flows of groupA but none of groupB
	groupA = 0
	groupB = 0
	for _, flow := range flows {
		if flow.Forward.Protocol == 17 &&
			flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.10")) &&
			flow.Forward.DstPort == 6000 &&
			(flow.Forward.SrcPort >= 5000 && flow.Forward.SrcPort <= 5005) {
			groupA++
		}
		if flow.Forward.Protocol == 17 &&
			flow.Forward.DstIP.Equal(net.ParseIP("127.0.0.20")) &&
			flow.Forward.DstPort == 8000 &&
			(flow.Forward.SrcPort >= 7000 && flow.Forward.SrcPort <= 7005) {
			groupB++
		}
	}
	if groupA != 5 || groupB > 0 {
		t.Fatalf("Error during the erase groupA:%d, groupB:%d", groupA, groupB)
	}

	// Switch back to the original namespace
	netns.Set(*origns)
}

func TestConntrackFilter(t *testing.T) {
	var flowList []ConntrackFlow
	flowList = append(flowList, ConntrackFlow{
		FamilyType: unix.AF_INET,
		Forward: ipTuple{
			SrcIP:   net.ParseIP("10.0.0.1"),
			DstIP:   net.ParseIP("20.0.0.1"),
			SrcPort: 1000,
			DstPort: 2000,
		},
		Reverse: ipTuple{
			SrcIP:   net.ParseIP("20.0.0.1"),
			DstIP:   net.ParseIP("192.168.1.1"),
			SrcPort: 2000,
			DstPort: 1000,
		},
	},
		ConntrackFlow{
			FamilyType: unix.AF_INET,
			Forward: ipTuple{
				SrcIP:   net.ParseIP("10.0.0.2"),
				DstIP:   net.ParseIP("20.0.0.2"),
				SrcPort: 5000,
				DstPort: 6000,
			},
			Reverse: ipTuple{
				SrcIP:   net.ParseIP("20.0.0.2"),
				DstIP:   net.ParseIP("192.168.1.1"),
				SrcPort: 6000,
				DstPort: 5000,
			},
		},
		ConntrackFlow{
			FamilyType: unix.AF_INET6,
			Forward: ipTuple{
				SrcIP:   net.ParseIP("eeee:eeee:eeee:eeee:eeee:eeee:eeee:eeee"),
				DstIP:   net.ParseIP("dddd:dddd:dddd:dddd:dddd:dddd:dddd:dddd"),
				SrcPort: 1000,
				DstPort: 2000,
			},
			Reverse: ipTuple{
				SrcIP:   net.ParseIP("dddd:dddd:dddd:dddd:dddd:dddd:dddd:dddd"),
				DstIP:   net.ParseIP("eeee:eeee:eeee:eeee:eeee:eeee:eeee:eeee"),
				SrcPort: 2000,
				DstPort: 1000,
			},
		})

	// Empty filter
	v4Match, v6Match := applyFilter(flowList, &ConntrackFilter{}, &ConntrackFilter{})
	if v4Match > 0 || v6Match > 0 {
		t.Fatalf("Error, empty filter cannot match, v4:%d, v6:%d", v4Match, v6Match)
	}

	// SrcIP filter
	filterV4 := &ConntrackFilter{}
	filterV4.AddIP(ConntrackOrigSrcIP, net.ParseIP("10.0.0.1"))

	filterV6 := &ConntrackFilter{}
	filterV6.AddIP(ConntrackOrigSrcIP, net.ParseIP("eeee:eeee:eeee:eeee:eeee:eeee:eeee:eeee"))

	v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
	if v4Match != 1 || v6Match != 1 {
		t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
	}

	// DstIp filter
	filterV4 = &ConntrackFilter{}
	filterV4.AddIP(ConntrackOrigDstIP, net.ParseIP("20.0.0.1"))

	filterV6 = &ConntrackFilter{}
	filterV6.AddIP(ConntrackOrigDstIP, net.ParseIP("dddd:dddd:dddd:dddd:dddd:dddd:dddd:dddd"))

	v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
	if v4Match != 1 || v6Match != 1 {
		t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
	}

	// SrcIP for NAT
	filterV4 = &ConntrackFilter{}
	filterV4.AddIP(ConntrackReplySrcIP, net.ParseIP("20.0.0.1"))

	filterV6 = &ConntrackFilter{}
	filterV6.AddIP(ConntrackReplySrcIP, net.ParseIP("dddd:dddd:dddd:dddd:dddd:dddd:dddd:dddd"))

	v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
	if v4Match != 1 || v6Match != 1 {
		t.Fatalf("Error, there should be only 1 match, v4:%d, v6:%d", v4Match, v6Match)
	}

	// DstIP for NAT
	filterV4 = &ConntrackFilter{}
	filterV4.AddIP(ConntrackReplyDstIP, net.ParseIP("192.168.1.1"))

	filterV6 = &ConntrackFilter{}
	filterV6.AddIP(ConntrackReplyDstIP, net.ParseIP("dddd:dddd:dddd:dddd:dddd:dddd:dddd:dddd"))

	v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
	if v4Match != 2 || v6Match != 0 {
		t.Fatalf("Error, there should be an exact match, v4:%d, v6:%d", v4Match, v6Match)
	}

	// AnyIp for Nat
	filterV4 = &ConntrackFilter{}
	filterV4.AddIP(ConntrackReplyAnyIP, net.ParseIP("192.168.1.1"))

	filterV6 = &ConntrackFilter{}
	filterV6.AddIP(ConntrackReplyAnyIP, net.ParseIP("eeee:eeee:eeee:eeee:eeee:eeee:eeee:eeee"))

	v4Match, v6Match = applyFilter(flowList, filterV4, filterV6)
	if v4Match != 2 || v6Match != 1 {
		t.Fatalf("Error, there should be an exact match, v4:%d, v6:%d", v4Match, v6Match)
	}
}