cfg_subnets6_unittest.cc 19.7 KB
Newer Older
1
// Copyright (C) 2014-2015,2017 Internet Systems Consortium, Inc. ("ISC")
2
//
3
4
5
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
6
7
8
9
10
11
12
13
14

#include <config.h>
#include <dhcp/classify.h>
#include <dhcp/dhcp6.h>
#include <dhcp/option.h>
#include <dhcpsrv/cfg_subnets6.h>
#include <dhcpsrv/subnet.h>
#include <dhcpsrv/subnet_id.h>
#include <dhcpsrv/subnet_selector.h>
15
#include <testutils/test_to_element.h>
16
17
18
19
20
21
#include <gtest/gtest.h>
#include <string>

using namespace isc;
using namespace isc::asiolink;
using namespace isc::dhcp;
22
using namespace isc::test;
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

namespace {

/// @brief Generates interface id option.
///
/// @param text Interface id in a textual format.
OptionPtr
generateInterfaceId(const std::string& text) {
    OptionBuffer buffer(text.begin(), text.end());
    return OptionPtr(new Option(Option::V6, D6O_INTERFACE_ID, buffer));
}

// This test checks that the subnet can be selected using a relay agent's
// link address.
TEST(CfgSubnets6Test, selectSubnetByRelayAddress) {
    CfgSubnets6 cfg;

    // Let's configure 3 subnets
    Subnet6Ptr subnet1(new Subnet6(IOAddress("2001:db8:1::"), 48, 1, 2, 3, 4));
    Subnet6Ptr subnet2(new Subnet6(IOAddress("2001:db8:2::"), 48, 1, 2, 3, 4));
    Subnet6Ptr subnet3(new Subnet6(IOAddress("2001:db8:3::"), 48, 1, 2, 3, 4));
    cfg.add(subnet1);
    cfg.add(subnet2);
    cfg.add(subnet3);

    // Make sure that none of the subnets is selected when there is no relay
    // information configured for them.
    SubnetSelector selector;
    selector.first_relay_linkaddr_ = IOAddress("2001:db8:ff::1");
    EXPECT_FALSE(cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("2001:db8:ff::2");
    EXPECT_FALSE(cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("2001:db8:ff::3");
    EXPECT_FALSE(cfg.selectSubnet(selector));

    // Now specify relay information.
    subnet1->setRelayInfo(IOAddress("2001:db8:ff::1"));
    subnet2->setRelayInfo(IOAddress("2001:db8:ff::2"));
    subnet3->setRelayInfo(IOAddress("2001:db8:ff::3"));

    // And try again. This time relay-info is there and should match.
    selector.first_relay_linkaddr_ = IOAddress("2001:db8:ff::1");
    EXPECT_EQ(subnet1, cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("2001:db8:ff::2");
    EXPECT_EQ(subnet2, cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("2001:db8:ff::3");
    EXPECT_EQ(subnet3, cfg.selectSubnet(selector));
}

// This test checks that the subnet can be selected using an interface
// name associated with a asubnet.
TEST(CfgSubnets6Test, selectSubnetByInterfaceName) {
    CfgSubnets6 cfg;

    // Let's create 3 subnets.
    Subnet6Ptr subnet1(new Subnet6(IOAddress("2000::"), 48, 1, 2, 3, 4));
    Subnet6Ptr subnet2(new Subnet6(IOAddress("3000::"), 48, 1, 2, 3, 4));
    Subnet6Ptr subnet3(new Subnet6(IOAddress("4000::"), 48, 1, 2, 3, 4));
    subnet1->setIface("foo");
    subnet2->setIface("bar");
    subnet3->setIface("foobar");

    // Until subnets are added to the configuration, there should be nothing
    // returned.
    SubnetSelector selector;
    selector.iface_name_ = "foo";
    EXPECT_FALSE(cfg.selectSubnet(selector));

    // Add one of the subnets.
    cfg.add(subnet1);

    // The subnet should be now selected for the interface name "foo".
    EXPECT_EQ(subnet1, cfg.selectSubnet(selector));

    // Check that the interface name is checked even when there is
    // only one subnet defined: there should be nothing returned when
    // other interface name is specified.
    selector.iface_name_ = "bar";
    EXPECT_FALSE(cfg.selectSubnet(selector));

    // Add other subnets.
    cfg.add(subnet2);
    cfg.add(subnet3);

    // When we specify correct interface names, the subnets should be returned.
    selector.iface_name_ = "foobar";
    EXPECT_EQ(subnet3, cfg.selectSubnet(selector));
    selector.iface_name_ = "bar";
    EXPECT_EQ(subnet2, cfg.selectSubnet(selector));

    // When specifying a non-existing interface the subnet should not be
    // returned.
    selector.iface_name_ = "xyzzy";
    EXPECT_FALSE(cfg.selectSubnet(selector));
}

// This test checks that the subnet can be selected using an Interface ID
// option inserted by a relay.
TEST(CfgSubnets6Test, selectSubnetByInterfaceId) {
    CfgSubnets6 cfg;

    // Create 3 subnets.
    Subnet6Ptr subnet1(new Subnet6(IOAddress("2000::"), 48, 1, 2, 3, 4));
    Subnet6Ptr subnet2(new Subnet6(IOAddress("3000::"), 48, 1, 2, 3, 4));
    Subnet6Ptr subnet3(new Subnet6(IOAddress("4000::"), 48, 1, 2, 3, 4));

    // Create Interface-id options used in subnets 1,2, and 3
    OptionPtr ifaceid1 = generateInterfaceId("relay1.eth0");
    OptionPtr ifaceid2 = generateInterfaceId("VL32");
    // That's a strange interface-id, but this is a real life example
    OptionPtr ifaceid3 = generateInterfaceId("ISAM144|299|ipv6|nt:vp:1:110");

    // Bogus interface-id.
    OptionPtr ifaceid_bogus = generateInterfaceId("non-existent");

    // Assign interface ids to the respective subnets.
    subnet1->setInterfaceId(ifaceid1);
    subnet2->setInterfaceId(ifaceid2);
    subnet3->setInterfaceId(ifaceid3);

    // There shouldn't be any subnet configured at this stage.
    SubnetSelector selector;
    selector.interface_id_ = ifaceid1;
    // Note that some link address must be specified to indicate that it is
    // a relayed message!
    selector.first_relay_linkaddr_ = IOAddress("5000::1");
    EXPECT_FALSE(cfg.selectSubnet(selector));

    // Add one of the subnets.
    cfg.add(subnet1);

    // If only one subnet has been specified, it should be returned when the
    // interface id matches. But, for a different interface id there should be
    // no match.
    EXPECT_EQ(subnet1, cfg.selectSubnet(selector));
    selector.interface_id_ = ifaceid2;
    EXPECT_FALSE(cfg.selectSubnet(selector));

    // Add other subnets.
    cfg.add(subnet2);
    cfg.add(subnet3);

    // Now that we have all subnets added. we should be able to retrieve them
    // using appropriate interface ids.
    selector.interface_id_ = ifaceid3;
    EXPECT_EQ(subnet3, cfg.selectSubnet(selector));
    selector.interface_id_ = ifaceid2;
    EXPECT_EQ(subnet2, cfg.selectSubnet(selector));

    // For invalid interface id, there should be nothing returned.
    selector.interface_id_ = ifaceid_bogus;
    EXPECT_FALSE(cfg.selectSubnet(selector));
}

// Test that the client classes are considered when the subnet is selected by
// the relay link address.
TEST(CfgSubnets6Test, selectSubnetByRelayAddressAndClassify) {
    CfgSubnets6 cfg;

    // Let's configure 3 subnets
    Subnet6Ptr subnet1(new Subnet6(IOAddress("2000::"), 48, 1, 2, 3, 4));
    Subnet6Ptr subnet2(new Subnet6(IOAddress("3000::"), 48, 1, 2, 3, 4));
    Subnet6Ptr subnet3(new Subnet6(IOAddress("4000::"), 48, 1, 2, 3, 4));
    cfg.add(subnet1);
    cfg.add(subnet2);
    cfg.add(subnet3);

    // Let's sanity check that we can use that configuration.
    SubnetSelector selector;
    selector.first_relay_linkaddr_ = IOAddress("2000::123");
    EXPECT_EQ(subnet1, cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("3000::345");
    EXPECT_EQ(subnet2, cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("4000::567");
    EXPECT_EQ(subnet3, cfg.selectSubnet(selector));

    // Client now belongs to bar class.
    selector.client_classes_.insert("bar");

    // There are no class restrictions defined, so everything should work
    // as before.
    selector.first_relay_linkaddr_ = IOAddress("2000::123");
    EXPECT_EQ(subnet1, cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("3000::345");
    EXPECT_EQ(subnet2, cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("4000::567");
    EXPECT_EQ(subnet3, cfg.selectSubnet(selector));

    // Now let's add client class restrictions.
    subnet1->allowClientClass("foo"); // Serve here only clients from foo class
    subnet2->allowClientClass("bar"); // Serve here only clients from bar class
    subnet3->allowClientClass("baz"); // Serve here only clients from baz class

    // The same check as above should result in client being served only in
    // bar class, i.e. subnet2
    selector.first_relay_linkaddr_ = IOAddress("2000::123");
    EXPECT_FALSE(cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("3000::345");
    EXPECT_EQ(subnet2, cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("4000::567");
    EXPECT_FALSE(cfg.selectSubnet(selector));

    // Now let's check that client with wrong class is not supported
    selector.client_classes_.clear();
    selector.client_classes_.insert("some_other_class");
    selector.first_relay_linkaddr_ = IOAddress("2000::123");
    EXPECT_FALSE(cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("3000::345");
    EXPECT_FALSE(cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("4000::567");
    EXPECT_FALSE(cfg.selectSubnet(selector));

    // Finally, let's check that client without any classes is not supported
    selector.client_classes_.clear();
    selector.first_relay_linkaddr_ = IOAddress("2000::123");
    EXPECT_FALSE(cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("3000::345");
    EXPECT_FALSE(cfg.selectSubnet(selector));
    selector.first_relay_linkaddr_ = IOAddress("4000::567");
    EXPECT_FALSE(cfg.selectSubnet(selector));
}

Andrei Pavel's avatar
Andrei Pavel committed
245
// Test that client classes are considered when the subnet is selected by the
246
// interface name.
Josh Soref's avatar
Josh Soref committed
247
TEST(CfgSubnets6Test, selectSubnetByInterfaceNameAndClassify) {
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
    CfgSubnets6 cfg;

    Subnet6Ptr subnet1(new Subnet6(IOAddress("2000::"), 48, 1, 2, 3, 4));
    Subnet6Ptr subnet2(new Subnet6(IOAddress("3000::"), 48, 1, 2, 3, 4));
    Subnet6Ptr subnet3(new Subnet6(IOAddress("4000::"), 48, 1, 2, 3, 4));
    subnet1->setIface("foo");
    subnet2->setIface("bar");
    subnet3->setIface("foobar");

    cfg.add(subnet1);
    cfg.add(subnet2);
    cfg.add(subnet3);

    // Now we have only one subnet, any request will be served from it
    SubnetSelector selector;
    selector.client_classes_.insert("bar");
    selector.iface_name_ = "foo";
    EXPECT_EQ(subnet1, cfg.selectSubnet(selector));
    selector.iface_name_ = "bar";
    EXPECT_EQ(subnet2, cfg.selectSubnet(selector));
    selector.iface_name_ = "foobar";
    EXPECT_EQ(subnet3, cfg.selectSubnet(selector));

    subnet1->allowClientClass("foo"); // Serve here only clients from foo class
    subnet2->allowClientClass("bar"); // Serve here only clients from bar class
    subnet3->allowClientClass("baz"); // Serve here only clients from baz class

    selector.iface_name_ = "foo";
    EXPECT_FALSE(cfg.selectSubnet(selector));
    selector.iface_name_ = "bar";
    EXPECT_EQ(subnet2, cfg.selectSubnet(selector));
    selector.iface_name_ = "foobar";
    EXPECT_FALSE(cfg.selectSubnet(selector));
}

// Test that client classes are considered when the interface is selected by
// the interface id.
TEST(CfgSubnets6Test, selectSubnetByInterfaceIdAndClassify) {
    CfgSubnets6 cfg;

    Subnet6Ptr subnet1(new Subnet6(IOAddress("2000::"), 48, 1, 2, 3, 4));
    Subnet6Ptr subnet2(new Subnet6(IOAddress("3000::"), 48, 1, 2, 3, 4));
    Subnet6Ptr subnet3(new Subnet6(IOAddress("4000::"), 48, 1, 2, 3, 4));

    // interface-id options used in subnets 1,2, and 3
    OptionPtr ifaceid1 = generateInterfaceId("relay1.eth0");
    OptionPtr ifaceid2 = generateInterfaceId("VL32");
    // That's a strange interface-id, but this is a real life example
    OptionPtr ifaceid3 = generateInterfaceId("ISAM144|299|ipv6|nt:vp:1:110");

    // bogus interface-id
    OptionPtr ifaceid_bogus = generateInterfaceId("non-existent");

    subnet1->setInterfaceId(ifaceid1);
    subnet2->setInterfaceId(ifaceid2);
    subnet3->setInterfaceId(ifaceid3);

    cfg.add(subnet1);
    cfg.add(subnet2);
    cfg.add(subnet3);

    // If we have only a single subnet and the request came from a local
    // address, let's use that subnet
    SubnetSelector selector;
    selector.first_relay_linkaddr_ = IOAddress("5000::1");
    selector.client_classes_.insert("bar");
    selector.interface_id_ = ifaceid1;
    EXPECT_EQ(subnet1, cfg.selectSubnet(selector));
    selector.interface_id_ = ifaceid2;
    EXPECT_EQ(subnet2, cfg.selectSubnet(selector));
    selector.interface_id_ = ifaceid3;
    EXPECT_EQ(subnet3, cfg.selectSubnet(selector));

    subnet1->allowClientClass("foo"); // Serve here only clients from foo class
    subnet2->allowClientClass("bar"); // Serve here only clients from bar class
    subnet3->allowClientClass("baz"); // Serve here only clients from baz class

    EXPECT_FALSE(cfg.selectSubnet(selector));
    selector.interface_id_ = ifaceid2;
    EXPECT_EQ(subnet2, cfg.selectSubnet(selector));
    selector.interface_id_ = ifaceid3;
    EXPECT_FALSE(cfg.selectSubnet(selector));
}

// Checks that detection of duplicated subnet IDs works as expected. It should
// not be possible to add two IPv6 subnets holding the same ID.
334
TEST(CfgSubnets6Test, duplication) {
335
336
337
338
339
340
341
342
343
344
345
346
    CfgSubnets6 cfg;

    Subnet6Ptr subnet1(new Subnet6(IOAddress("2000::"), 48, 1, 2, 3, 4, 123));
    Subnet6Ptr subnet2(new Subnet6(IOAddress("3000::"), 48, 1, 2, 3, 4, 124));
    Subnet6Ptr subnet3(new Subnet6(IOAddress("4000::"), 48, 1, 2, 3, 4, 123));

    ASSERT_NO_THROW(cfg.add(subnet1));
    EXPECT_NO_THROW(cfg.add(subnet2));
    // Subnet 3 has the same ID as subnet 1. It shouldn't be able to add it.
    EXPECT_THROW(cfg.add(subnet3), isc::dhcp::DuplicateSubnetID);
}

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
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
// This test check if IPv6 subnets can be unparsed in a predictable way,
TEST(CfgSubnets6Test, unparseSubnet) {
    CfgSubnets6 cfg;

    // Add some subnets.
    Subnet6Ptr subnet1(new Subnet6(IOAddress("2001:db8:1::"),
                                   48, 1, 2, 3, 4, 123));
    Subnet6Ptr subnet2(new Subnet6(IOAddress("2001:db8:2::"),
                                   48, 1, 2, 3, 4, 124));
    Subnet6Ptr subnet3(new Subnet6(IOAddress("2001:db8:3::"),
                                   48, 1, 2, 3, 4, 125));

    OptionPtr ifaceid = generateInterfaceId("relay.eth0");
    subnet1->setInterfaceId(ifaceid);
    subnet1->allowClientClass("foo");
    subnet2->setIface("lo");
    subnet2->setRelayInfo(IOAddress("2001:db8:ff::2"));
    subnet3->setIface("eth1");

    cfg.add(subnet1);
    cfg.add(subnet2);
    cfg.add(subnet3);

    // Unparse
    std::string expected = "[\n"
        "{\n"
        "    \"id\": 123,\n"
        "    \"subnet\": \"2001:db8:1::/48\",\n"
        "    \"relay\": { \"ip-address\": \"::\" },\n"
        "    \"interface-id\": \"relay.eth0\",\n"
        "    \"interface\": \"\",\n"
        "    \"renew-timer\": 1,\n"
        "    \"rebind-timer\": 2,\n"
        "    \"preferred-lifetime\": 3,\n"
        "    \"valid-lifetime\": 4,\n"
        "    \"rapid-commit\": false,\n"
        "    \"reservation-mode\": \"all\",\n"
        "    \"client-class\": \"foo\",\n"
        "    \"pools\": [ ],\n"
        "    \"pd-pools\": [ ],\n"
        "    \"option-data\": [ ]\n"
        "},{\n"
        "    \"id\": 124,\n"
        "    \"subnet\": \"2001:db8:2::/48\",\n"
        "    \"relay\": { \"ip-address\": \"2001:db8:ff::2\" },\n"
        "    \"interface-id\": \"\",\n"
        "    \"interface\": \"lo\",\n"
        "    \"renew-timer\": 1,\n"
        "    \"rebind-timer\": 2,\n"
        "    \"preferred-lifetime\": 3,\n"
        "    \"valid-lifetime\": 4,\n"
        "    \"rapid-commit\": false,\n"
        "    \"reservation-mode\": \"all\",\n"
        "    \"pools\": [ ],\n"
        "    \"pd-pools\": [ ],\n"
        "    \"option-data\": [ ]\n"
        "},{\n"
        "    \"id\": 125,\n"
        "    \"subnet\": \"2001:db8:3::/48\",\n"
        "    \"relay\": { \"ip-address\": \"::\" },\n"
        "    \"interface-id\": \"\",\n"
        "    \"interface\": \"eth1\",\n"
        "    \"renew-timer\": 1,\n"
        "    \"rebind-timer\": 2,\n"
        "    \"preferred-lifetime\": 3,\n"
        "    \"valid-lifetime\": 4,\n"
        "    \"rapid-commit\": false,\n"
        "    \"reservation-mode\": \"all\",\n"
        "    \"pools\": [ ],\n"
        "    \"pd-pools\": [ ],\n"
        "    \"option-data\": [ ]\n"
        "} ]\n";
    runToElementTest<CfgSubnets6>(expected, cfg);
}

// This test check if IPv6 pools can be unparsed in a predictable way,
TEST(CfgSubnets6Test, unparsePool) {
    CfgSubnets6 cfg;

    // Add a subnet with pools
    Subnet6Ptr subnet(new Subnet6(IOAddress("2001:db8:1::"),
                                  48, 1, 2, 3, 4, 123));
    Pool6Ptr pool1(new Pool6(Lease::TYPE_NA,
                             IOAddress("2001:db8:1::100"),
                             IOAddress("2001:db8:1::199")));
    Pool6Ptr pool2(new Pool6(Lease::TYPE_NA, IOAddress("2001:db8:1:1::"), 64));

    subnet->addPool(pool1);
    subnet->addPool(pool2);
    cfg.add(subnet);
    
    // Unparse
    std::string expected = "[\n"
        "{\n"
        "    \"id\": 123,\n"
        "    \"subnet\": \"2001:db8:1::/48\",\n"
        "    \"relay\": { \"ip-address\": \"::\" },\n"
        "    \"interface-id\": \"\",\n"
        "    \"interface\": \"\",\n"
        "    \"renew-timer\": 1,\n"
        "    \"rebind-timer\": 2,\n"
        "    \"preferred-lifetime\": 3,\n"
        "    \"valid-lifetime\": 4,\n"
        "    \"rapid-commit\": false,\n"
        "    \"reservation-mode\": \"all\",\n"
        "    \"pools\": [\n"
        "        {\n"
        "            \"pool\": \"2001:db8:1::100-2001:db8:1::199\",\n"
        "            \"option-data\": [ ]\n"
        "        },{\n"
        "            \"pool\": \"2001:db8:1:1::/64\",\n"
        "            \"option-data\": [ ]\n"
        "        }\n"
        "    ],\n"
        "    \"pd-pools\": [ ],\n"
        "    \"option-data\": [ ]\n"
        "} ]\n";
    runToElementTest<CfgSubnets6>(expected, cfg);
}

// This test check if IPv6 prefix delegation pools can be unparsed
// in a predictable way,
TEST(CfgSubnets6Test, unparsePdPool) {
    CfgSubnets6 cfg;

    // Add a subnet with pd-pools
    Subnet6Ptr subnet(new Subnet6(IOAddress("2001:db8:1::"),
                                  48, 1, 2, 3, 4, 123));
    Pool6Ptr pdpool1(new Pool6(Lease::TYPE_PD,
                               IOAddress("2001:db8:2::"), 48, 64));
    Pool6Ptr pdpool2(new Pool6(IOAddress("2001:db8:3::"), 48, 56,
                               IOAddress("2001:db8:3::"), 64));

    subnet->addPool(pdpool1);
    subnet->addPool(pdpool2);
    cfg.add(subnet);
    
    // Unparse
    std::string expected = "[\n"
        "{\n"
        "    \"id\": 123,\n"
        "    \"subnet\": \"2001:db8:1::/48\",\n"
        "    \"relay\": { \"ip-address\": \"::\" },\n"
        "    \"interface-id\": \"\",\n"
        "    \"interface\": \"\",\n"
        "    \"renew-timer\": 1,\n"
        "    \"rebind-timer\": 2,\n"
        "    \"preferred-lifetime\": 3,\n"
        "    \"valid-lifetime\": 4,\n"
        "    \"rapid-commit\": false,\n"
        "    \"reservation-mode\": \"all\",\n"
        "    \"pools\": [ ],\n"
        "    \"pd-pools\": [\n"
        "        {\n"
        "            \"prefix\": \"2001:db8:2::\",\n"
        "            \"prefix-len\": 48,\n"
        "            \"delegated-len\": 64,\n"
        "            \"excluded-prefix\": \"::\",\n"
        "            \"excluded-prefix-len\": 0,\n"
        "            \"option-data\": [ ]\n"
        "        },{\n"
        "            \"prefix\": \"2001:db8:3::\",\n"
        "            \"prefix-len\": 48,\n"
        "            \"delegated-len\": 56,\n"
        "            \"excluded-prefix\": \"2001:db8:3::\",\n"
        "            \"excluded-prefix-len\": 64,\n"
        "            \"option-data\": [ ]\n"
        "        }\n"
        "    ],\n"
        "    \"option-data\": [ ]\n"
        "} ]\n";
    runToElementTest<CfgSubnets6>(expected, cfg);
}

521
} // end of anonymous namespace