-
Notifications
You must be signed in to change notification settings - Fork 0
/
table_test.go
1255 lines (1135 loc) · 34.3 KB
/
table_test.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
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
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
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package art
import (
crand "crypto/rand"
"fmt"
"math/rand"
"net/netip"
"runtime"
"strconv"
"testing"
"time"
)
func TestRegression(t *testing.T) {
// These tests are specific triggers for subtle correctness issues
// that came up during initial implementation. Even if they seem
// arbitrary, please do not clean them up. They are checking edge
// cases that are very easy to get wrong, and quite difficult for
// the other statistical tests to trigger promptly.
t.Run("prefixes_aligned_on_stride_boundary", func(t *testing.T) {
// Regression test for computePrefixSplit called with equal
// arguments.
tbl := &Table[int]{}
slow := slowPrefixTable[int]{}
p := netip.MustParsePrefix
tbl.Insert(p("226.205.197.0/24"), 1)
slow.insert(p("226.205.197.0/24"), 1)
tbl.Insert(p("226.205.0.0/16"), 2)
slow.insert(p("226.205.0.0/16"), 2)
probe := netip.MustParseAddr("226.205.121.152")
got, gotOK := tbl.Get(probe)
want, wantOK := slow.get(probe)
if !getsEqual(got, gotOK, want, wantOK) {
t.Fatalf("got (%v, %v), want (%v, %v)", got, gotOK, want, wantOK)
}
})
t.Run("parent_prefix_inserted_in_different_orders", func(t *testing.T) {
// Regression test for the off-by-one correction applied
// within computePrefixSplit.
t1, t2 := &Table[int]{}, &Table[int]{}
p := netip.MustParsePrefix
t1.Insert(p("136.20.0.0/16"), 1)
t1.Insert(p("136.20.201.62/32"), 2)
t2.Insert(p("136.20.201.62/32"), 2)
t2.Insert(p("136.20.0.0/16"), 1)
a := netip.MustParseAddr("136.20.54.139")
got1, ok1 := t1.Get(a)
got2, ok2 := t2.Get(a)
if !getsEqual(got1, ok1, got2, ok2) {
t.Errorf("Get(%q) is insertion order dependent: t1=(%v, %v), t2=(%v, %v)", a, got1, ok1, got2, ok2)
}
})
}
func TestComputePrefixSplit(t *testing.T) {
// These tests are partially redundant with other tests. Please
// keep them anyway. computePrefixSplit's behavior is remarkably
// subtle, and all the test cases listed below come from
// hard-earned debugging of malformed route tables.
var tests = []struct {
// prefixA can be a /8, /16 or /24 (v4).
// prefixB can be anything /9 or more specific.
prefixA, prefixB string
lastCommon string
aStride, bStride uint8
}{
{"192.168.1.0/24", "192.168.5.5/32", "192.168.0.0/16", 1, 5},
{"192.168.129.0/24", "192.168.128.0/17", "192.168.0.0/16", 129, 128},
{"192.168.5.0/24", "192.168.0.0/16", "192.0.0.0/8", 168, 168},
{"192.168.0.0/16", "192.168.0.0/16", "192.0.0.0/8", 168, 168},
{"ff:aaaa:aaaa::1/128", "ff:aaaa::/120", "ff:aaaa::/32", 170, 0},
}
for _, test := range tests {
a, b := netip.MustParsePrefix(test.prefixA), netip.MustParsePrefix(test.prefixB)
gotLastCommon, gotAStride, gotBStride := computePrefixSplit(a, b)
if want := netip.MustParsePrefix(test.lastCommon); gotLastCommon != want || gotAStride != test.aStride || gotBStride != test.bStride {
t.Errorf("computePrefixSplit(%q, %q) = %s, %d, %d; want %s, %d, %d", a, b, gotLastCommon, gotAStride, gotBStride, want, test.aStride, test.bStride)
}
}
}
func TestInsert(t *testing.T) {
tbl := &Table[int]{}
p := netip.MustParsePrefix
// Create a new leaf strideTable, with compressed path
tbl.Insert(p("192.168.0.1/32"), 1)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", -1},
{"192.168.0.3", -1},
{"192.168.0.255", -1},
{"192.168.1.1", -1},
{"192.170.1.1", -1},
{"192.180.0.1", -1},
{"192.180.3.5", -1},
{"10.0.0.5", -1},
{"10.0.0.15", -1},
})
// Insert into previous leaf, no tree changes
tbl.Insert(p("192.168.0.2/32"), 2)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", -1},
{"192.168.0.255", -1},
{"192.168.1.1", -1},
{"192.170.1.1", -1},
{"192.180.0.1", -1},
{"192.180.3.5", -1},
{"10.0.0.5", -1},
{"10.0.0.15", -1},
})
// Insert into previous leaf, unaligned prefix covering the /32s
tbl.Insert(p("192.168.0.0/26"), 7)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", -1},
{"192.168.1.1", -1},
{"192.170.1.1", -1},
{"192.180.0.1", -1},
{"192.180.3.5", -1},
{"10.0.0.5", -1},
{"10.0.0.15", -1},
})
// Create a different leaf elsewhere
tbl.Insert(p("10.0.0.0/27"), 3)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", -1},
{"192.168.1.1", -1},
{"192.170.1.1", -1},
{"192.180.0.1", -1},
{"192.180.3.5", -1},
{"10.0.0.5", 3},
{"10.0.0.15", 3},
})
// Insert that creates a new intermediate table and a new child
tbl.Insert(p("192.168.1.1/32"), 4)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", -1},
{"192.168.1.1", 4},
{"192.170.1.1", -1},
{"192.180.0.1", -1},
{"192.180.3.5", -1},
{"10.0.0.5", 3},
{"10.0.0.15", 3},
})
// Insert that creates a new intermediate table but no new child
tbl.Insert(p("192.170.0.0/16"), 5)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", -1},
{"192.168.1.1", 4},
{"192.170.1.1", 5},
{"192.180.0.1", -1},
{"192.180.3.5", -1},
{"10.0.0.5", 3},
{"10.0.0.15", 3},
})
// New leaf in a different subtree, so the next insert can test a
// variant of decompression.
tbl.Insert(p("192.180.0.1/32"), 8)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", -1},
{"192.168.1.1", 4},
{"192.170.1.1", 5},
{"192.180.0.1", 8},
{"192.180.3.5", -1},
{"10.0.0.5", 3},
{"10.0.0.15", 3},
})
// Insert that creates a new intermediate table but no new child,
// with an unaligned intermediate
tbl.Insert(p("192.180.0.0/21"), 9)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", -1},
{"192.168.1.1", 4},
{"192.170.1.1", 5},
{"192.180.0.1", 8},
{"192.180.3.5", 9},
{"10.0.0.5", 3},
{"10.0.0.15", 3},
})
// Insert a default route, those have their own codepath.
tbl.Insert(p("0.0.0.0/0"), 6)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.168.0.3", 7},
{"192.168.0.255", 6},
{"192.168.1.1", 4},
{"192.170.1.1", 5},
{"192.180.0.1", 8},
{"192.180.3.5", 9},
{"10.0.0.5", 3},
{"10.0.0.15", 3},
})
// Now all of the above again, but for IPv6.
// Create a new leaf strideTable, with compressed path
tbl.Insert(p("ff:aaaa::1/128"), 1)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", -1},
{"ff:aaaa::3", -1},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", -1},
{"ff:aaaa:aaaa:bbbb::1", -1},
{"ff:cccc::1", -1},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", -1},
{"ffff:bbbb::15", -1},
})
// Insert into previous leaf, no tree changes
tbl.Insert(p("ff:aaaa::2/128"), 2)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", -1},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", -1},
{"ff:aaaa:aaaa:bbbb::1", -1},
{"ff:cccc::1", -1},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", -1},
{"ffff:bbbb::15", -1},
})
// Insert into previous leaf, unaligned prefix covering the /128s
tbl.Insert(p("ff:aaaa::/125"), 7)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", -1},
{"ff:aaaa:aaaa:bbbb::1", -1},
{"ff:cccc::1", -1},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", -1},
{"ffff:bbbb::15", -1},
})
// Create a different leaf elsewhere
tbl.Insert(p("ffff:bbbb::/120"), 3)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", -1},
{"ff:aaaa:aaaa:bbbb::1", -1},
{"ff:cccc::1", -1},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", 3},
{"ffff:bbbb::15", 3},
})
// Insert that creates a new intermediate table and a new child
tbl.Insert(p("ff:aaaa:aaaa::1/128"), 4)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", 4},
{"ff:aaaa:aaaa:bbbb::1", -1},
{"ff:cccc::1", -1},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", 3},
{"ffff:bbbb::15", 3},
})
// Insert that creates a new intermediate table but no new child
tbl.Insert(p("ff:aaaa:aaaa:bb00::/56"), 5)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", 4},
{"ff:aaaa:aaaa:bbbb::1", 5},
{"ff:cccc::1", -1},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", 3},
{"ffff:bbbb::15", 3},
})
// New leaf in a different subtree, so the next insert can test a
// variant of decompression.
tbl.Insert(p("ff:cccc::1/128"), 8)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", 4},
{"ff:aaaa:aaaa:bbbb::1", 5},
{"ff:cccc::1", 8},
{"ff:cccc::ff", -1},
{"ffff:bbbb::5", 3},
{"ffff:bbbb::15", 3},
})
// Insert that creates a new intermediate table but no new child,
// with an unaligned intermediate
tbl.Insert(p("ff:cccc::/37"), 9)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", -1},
{"ff:aaaa:aaaa::1", 4},
{"ff:aaaa:aaaa:bbbb::1", 5},
{"ff:cccc::1", 8},
{"ff:cccc::ff", 9},
{"ffff:bbbb::5", 3},
{"ffff:bbbb::15", 3},
})
// Insert a default route, those have their own codepath.
tbl.Insert(p("::/0"), 6)
checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1},
{"ff:aaaa::2", 2},
{"ff:aaaa::3", 7},
{"ff:aaaa::255", 6},
{"ff:aaaa:aaaa::1", 4},
{"ff:aaaa:aaaa:bbbb::1", 5},
{"ff:cccc::1", 8},
{"ff:cccc::ff", 9},
{"ffff:bbbb::5", 3},
{"ffff:bbbb::15", 3},
})
}
func TestDelete(t *testing.T) {
t.Parallel()
p := netip.MustParsePrefix
t.Run("prefix_in_root", func(t *testing.T) {
// Add/remove prefix from root table.
tbl := &Table[int]{}
checkSize(t, tbl, 2)
tbl.Insert(p("10.0.0.0/8"), 1)
checkRoutes(t, tbl, []tableTest{
{"10.0.0.1", 1},
{"255.255.255.255", -1},
})
checkSize(t, tbl, 2)
tbl.Delete(p("10.0.0.0/8"))
checkRoutes(t, tbl, []tableTest{
{"10.0.0.1", -1},
{"255.255.255.255", -1},
})
checkSize(t, tbl, 2)
})
t.Run("prefix_in_leaf", func(t *testing.T) {
// Create, then delete a single leaf table.
tbl := &Table[int]{}
checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), 1)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"255.255.255.255", -1},
})
checkSize(t, tbl, 3)
tbl.Delete(p("192.168.0.1/32"))
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", -1},
{"255.255.255.255", -1},
})
checkSize(t, tbl, 2)
})
t.Run("intermediate_no_routes", func(t *testing.T) {
// Create an intermediate with 2 children, then delete one leaf.
tbl := &Table[int]{}
checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), 1)
tbl.Insert(p("192.180.0.1/32"), 2)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.180.0.1", 2},
{"192.40.0.1", -1},
})
checkSize(t, tbl, 5) // 2 roots, 1 intermediate, 2 leaves
tbl.Delete(p("192.180.0.1/32"))
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.180.0.1", -1},
{"192.40.0.1", -1},
})
checkSize(t, tbl, 3) // 2 roots, 1 leaf
})
t.Run("intermediate_with_route", func(t *testing.T) {
// Same, but the intermediate carries a route as well.
tbl := &Table[int]{}
checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), 1)
tbl.Insert(p("192.180.0.1/32"), 2)
tbl.Insert(p("192.0.0.0/10"), 3)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.180.0.1", 2},
{"192.40.0.1", 3},
{"192.255.0.1", -1},
})
checkSize(t, tbl, 5) // 2 roots, 1 intermediate, 2 leaves
tbl.Delete(p("192.180.0.1/32"))
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.180.0.1", -1},
{"192.40.0.1", 3},
{"192.255.0.1", -1},
})
checkSize(t, tbl, 4) // 2 roots, 1 intermediate w/route, 1 leaf
})
t.Run("intermediate_many_leaves", func(t *testing.T) {
// Intermediate with 3 leaves, then delete one leaf.
tbl := &Table[int]{}
checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), 1)
tbl.Insert(p("192.180.0.1/32"), 2)
tbl.Insert(p("192.200.0.1/32"), 3)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.180.0.1", 2},
{"192.200.0.1", 3},
{"192.255.0.1", -1},
})
checkSize(t, tbl, 6) // 2 roots, 1 intermediate, 3 leaves
tbl.Delete(p("192.180.0.1/32"))
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.180.0.1", -1},
{"192.200.0.1", 3},
{"192.255.0.1", -1},
})
checkSize(t, tbl, 5) // 2 roots, 1 intermediate, 2 leaves
})
t.Run("nosuchprefix_missing_child", func(t *testing.T) {
// Delete non-existent prefix, missing strideTable path.
tbl := &Table[int]{}
checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), 1)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.255.0.1", -1},
})
checkSize(t, tbl, 3) // 2 roots, 1 leaf
tbl.Delete(p("200.0.0.0/32")) // lookup miss in root
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.255.0.1", -1},
})
checkSize(t, tbl, 3) // 2 roots, 1 leaf
})
t.Run("nosuchprefix_wrong_turn", func(t *testing.T) {
// Delete non-existent prefix, strideTable path exists but
// with a wrong turn.
tbl := &Table[int]{}
checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), 1)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.255.0.1", -1},
})
checkSize(t, tbl, 3) // 2 roots, 1 leaf
tbl.Delete(p("192.40.0.0/32")) // finds wrong child
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.255.0.1", -1},
})
checkSize(t, tbl, 3) // 2 roots, 1 leaf
})
t.Run("nosuchprefix_not_in_leaf", func(t *testing.T) {
// Delete non-existent prefix, strideTable path exists but
// leaf doesn't contain route.
tbl := &Table[int]{}
checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), 1)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.255.0.1", -1},
})
checkSize(t, tbl, 3) // 2 roots, 1 leaf
tbl.Delete(p("192.168.0.5/32")) // right leaf, no route
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.255.0.1", -1},
})
checkSize(t, tbl, 3) // 2 roots, 1 leaf
})
t.Run("intermediate_with_deleted_route", func(t *testing.T) {
// Intermediate table loses its last route and becomes
// compactable.
tbl := &Table[int]{}
checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), 1)
tbl.Insert(p("192.168.0.0/22"), 2)
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", 2},
{"192.255.0.1", -1},
})
checkSize(t, tbl, 4) // 2 roots, 1 intermediate w/route, 1 leaf
tbl.Delete(p("192.168.0.0/22"))
checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1},
{"192.168.0.2", -1},
{"192.255.0.1", -1},
})
checkSize(t, tbl, 3) // 2 roots, 1 leaf
})
t.Run("default_route", func(t *testing.T) {
// Default routes have a special case in the code.
tbl := &Table[int]{}
tbl.Insert(p("0.0.0.0/0"), 1)
tbl.Delete(p("0.0.0.0/0"))
checkRoutes(t, tbl, []tableTest{
{"1.2.3.4", -1},
})
checkSize(t, tbl, 2) // 2 roots
})
}
func TestInsertCompare(t *testing.T) {
// Create large route tables repeatedly, and compare Table's
// behavior to a naive and slow but correct implementation.
t.Parallel()
pfxs := randomPrefixes(10_000)
slow := slowPrefixTable[int]{pfxs}
fast := Table[int]{}
for _, pfx := range pfxs {
fast.Insert(pfx.pfx, pfx.val)
}
if debugInsert {
t.Logf(fast.debugSummary())
}
seenVals4 := map[int]bool{}
seenVals6 := map[int]bool{}
for i := 0; i < 10_000; i++ {
a := randomAddr()
slowVal, slowOK := slow.get(a)
fastVal, fastOK := fast.Get(a)
if !getsEqual(slowVal, slowOK, fastVal, fastOK) {
t.Fatalf("get(%q) = (%v, %v), want (%v, %v)", a, fastVal, fastOK, slowVal, slowOK)
}
if a.Is6() {
seenVals6[fastVal] = true
} else {
seenVals4[fastVal] = true
}
}
// Empirically, 10k probes into 5k v4 prefixes and 5k v6 prefixes results in
// ~1k distinct values for v4 and ~300 for v6. distinct routes. This sanity
// check that we didn't just return a single route for everything should be
// very generous indeed.
if cnt := len(seenVals4); cnt < 10 {
t.Fatalf("saw %d distinct v4 route results, statistically expected ~1000", cnt)
}
if cnt := len(seenVals6); cnt < 10 {
t.Fatalf("saw %d distinct v6 route results, statistically expected ~300", cnt)
}
}
func TestInsertShuffled(t *testing.T) {
// The order in which you insert prefixes into a route table
// should not matter, as long as you're inserting the same set of
// routes. Verify that this is true, because ART does execute
// vastly different code depending on the order of insertion, even
// if the end result is identical.
//
// If you're here because this package's tests are slow and you
// want to make them faster, please do not delete this test (or
// any test, really). It may seem excessive to test this, but
// these shuffle tests found a lot of very nasty edge cases during
// development, and you _really_ don't want to be debugging a
// faulty route table in production.
t.Parallel()
pfxs := randomPrefixes(1000)
var pfxs2 []slowPrefixEntry[int]
defer func() {
if t.Failed() {
t.Logf("pre-shuffle: %#v", pfxs)
t.Logf("post-shuffle: %#v", pfxs2)
}
}()
for i := 0; i < 10; i++ {
pfxs2 := append([]slowPrefixEntry[int](nil), pfxs...)
rand.Shuffle(len(pfxs2), func(i, j int) { pfxs2[i], pfxs2[j] = pfxs2[j], pfxs2[i] })
addrs := make([]netip.Addr, 0, 10_000)
for i := 0; i < 10_000; i++ {
addrs = append(addrs, randomAddr())
}
rt := Table[int]{}
rt2 := Table[int]{}
for _, pfx := range pfxs {
rt.Insert(pfx.pfx, pfx.val)
}
for _, pfx := range pfxs2 {
rt2.Insert(pfx.pfx, pfx.val)
}
for _, a := range addrs {
val1, ok1 := rt.Get(a)
val2, ok2 := rt2.Get(a)
if !getsEqual(val1, ok1, val2, ok2) {
t.Fatalf("get(%q) = (%v, %v), want (%v, %v)", a, val2, ok2, val1, ok1)
}
}
}
}
func TestDeleteCompare(t *testing.T) {
// Create large route tables repeatedly, delete half of their
// prefixes, and compare Table's behavior to a naive and slow but
// correct implementation.
t.Parallel()
const (
numPrefixes = 10_000 // total prefixes to insert (test deletes 50% of them)
numPerFamily = numPrefixes / 2
deleteCut = numPerFamily / 2
numProbes = 10_000 // random addr lookups to do
)
// We have to do this little dance instead of just using allPrefixes,
// because we want pfxs and toDelete to be non-overlapping sets.
all4, all6 := randomPrefixes4(numPerFamily), randomPrefixes6(numPerFamily)
pfxs := append([]slowPrefixEntry[int](nil), all4[:deleteCut]...)
pfxs = append(pfxs, all6[:deleteCut]...)
toDelete := append([]slowPrefixEntry[int](nil), all4[deleteCut:]...)
toDelete = append(toDelete, all6[deleteCut:]...)
defer func() {
if t.Failed() {
for _, pfx := range pfxs {
fmt.Printf("%q, ", pfx.pfx)
}
fmt.Println("")
for _, pfx := range toDelete {
fmt.Printf("%q, ", pfx.pfx)
}
fmt.Println("")
}
}()
slow := slowPrefixTable[int]{pfxs}
fast := Table[int]{}
for _, pfx := range pfxs {
fast.Insert(pfx.pfx, pfx.val)
}
for _, pfx := range toDelete {
fast.Insert(pfx.pfx, pfx.val)
}
for _, pfx := range toDelete {
fast.Delete(pfx.pfx)
}
seenVals4 := map[int]bool{}
seenVals6 := map[int]bool{}
for i := 0; i < numProbes; i++ {
a := randomAddr()
slowVal, slowOK := slow.get(a)
fastVal, fastOK := fast.Get(a)
if !getsEqual(slowVal, slowOK, fastVal, fastOK) {
t.Fatalf("get(%q) = (%v, %v), want (%v, %v)", a, fastVal, fastOK, slowVal, slowOK)
}
if a.Is6() {
seenVals6[fastVal] = true
} else {
seenVals4[fastVal] = true
}
}
// Empirically, 10k probes into 5k v4 prefixes and 5k v6 prefixes results in
// ~1k distinct values for v4 and ~300 for v6. distinct routes. This sanity
// check that we didn't just return a single route for everything should be
// very generous indeed.
if cnt := len(seenVals4); cnt < 10 {
t.Fatalf("saw %d distinct v4 route results, statistically expected ~1000", cnt)
}
if cnt := len(seenVals6); cnt < 10 {
t.Fatalf("saw %d distinct v6 route results, statistically expected ~300", cnt)
}
}
func TestDeleteShuffled(t *testing.T) {
// The order in which you delete prefixes from a route table
// should not matter, as long as you're deleting the same set of
// routes. Verify that this is true, because ART does execute
// vastly different code depending on the order of deletions, even
// if the end result is identical.
//
// If you're here because this package's tests are slow and you
// want to make them faster, please do not delete this test (or
// any test, really). It may seem excessive to test this, but
// these shuffle tests found a lot of very nasty edge cases during
// development, and you _really_ don't want to be debugging a
// faulty route table in production.
t.Parallel()
const (
numPrefixes = 10_000 // prefixes to insert (test deletes 50% of them)
numPerFamily = numPrefixes / 2
deleteCut = numPerFamily / 2
numProbes = 10_000 // random addr lookups to do
)
// We have to do this little dance instead of just using allPrefixes,
// because we want pfxs and toDelete to be non-overlapping sets.
all4, all6 := randomPrefixes4(numPerFamily), randomPrefixes6(numPerFamily)
pfxs := append([]slowPrefixEntry[int](nil), all4[:deleteCut]...)
pfxs = append(pfxs, all6[:deleteCut]...)
toDelete := append([]slowPrefixEntry[int](nil), all4[deleteCut:]...)
toDelete = append(toDelete, all6[deleteCut:]...)
rt := Table[int]{}
for _, pfx := range pfxs {
rt.Insert(pfx.pfx, pfx.val)
}
for _, pfx := range toDelete {
rt.Insert(pfx.pfx, pfx.val)
}
for _, pfx := range toDelete {
rt.Delete(pfx.pfx)
}
for i := 0; i < 10; i++ {
pfxs2 := append([]slowPrefixEntry[int](nil), pfxs...)
toDelete2 := append([]slowPrefixEntry[int](nil), toDelete...)
rand.Shuffle(len(toDelete2), func(i, j int) { toDelete2[i], toDelete2[j] = toDelete2[j], toDelete2[i] })
rt2 := Table[int]{}
for _, pfx := range pfxs2 {
rt2.Insert(pfx.pfx, pfx.val)
}
for _, pfx := range toDelete2 {
rt2.Insert(pfx.pfx, pfx.val)
}
for _, pfx := range toDelete2 {
rt2.Delete(pfx.pfx)
}
// Diffing a deep tree of tables gives cmp.Diff a nervous breakdown, so
// test for equivalence statistically with random probes instead.
for i := 0; i < numProbes; i++ {
a := randomAddr()
val1, ok1 := rt.Get(a)
val2, ok2 := rt2.Get(a)
if !getsEqual(val1, ok1, val2, ok2) {
t.Errorf("get(%q) = (%v, %v), want (%v, %v)", a, val2, ok2, val1, ok1)
}
}
}
}
func TestDeleteIsReverseOfInsert(t *testing.T) {
// Insert N prefixes, then delete those same prefixes in reverse
// order. Each deletion should exactly undo the internal structure
// changes that each insert did.
const N = 100
var tab Table[int]
prefixes := randomPrefixes(N)
defer func() {
if t.Failed() {
fmt.Printf("the prefixes that fail the test: %v\n", prefixes)
}
}()
want := make([]string, 0, len(prefixes))
for _, p := range prefixes {
want = append(want, tab.debugSummary())
tab.Insert(p.pfx, p.val)
}
for i := len(prefixes) - 1; i >= 0; i-- {
tab.Delete(prefixes[i].pfx)
if got := tab.debugSummary(); got != want[i] {
t.Fatalf("after delete %d, mismatch:\n\n got: %s\n\nwant: %s", i, got, want[i])
}
}
}
type tableTest struct {
// addr is an IP address string to look up in a route table.
addr string
// want is the expected >=0 value associated with the route, or -1
// if we expect a lookup miss.
want int
}
// checkRoutes verifies that the route lookups in tt return the
// expected results on tbl.
func checkRoutes(t *testing.T, tbl *Table[int], tt []tableTest) {
t.Helper()
for _, tc := range tt {
v, ok := tbl.Get(netip.MustParseAddr(tc.addr))
if !ok && tc.want != -1 {
t.Errorf("lookup %q got (%v, %v), want (_, false)", tc.addr, v, ok)
}
if ok && v != tc.want {
t.Errorf("lookup %q got (%v, %v), want (%v, true)", tc.addr, v, ok, tc.want)
}
}
}
// 100k routes for IPv6, at the current size of strideTable and strideEntry, is
// in the ballpark of 4GiB if you assume worst-case prefix distribution. Future
// optimizations will knock down the memory consumption by over an order of
// magnitude, so for now just skip the 100k benchmarks to stay well away of
// OOMs.
//
// TODO(go/bug/7781): reenable larger table tests once memory utilization is
// optimized.
var benchRouteCount = []int{10, 100, 1000, 10_000} //, 100_000}
// forFamilyAndCount runs the benchmark fn with different sets of
// routes.
//
// fn is called once for each combination of {addr_family, num_routes},
// where addr_family is ipv4 or ipv6, num_routes is the values in
// benchRouteCount.
func forFamilyAndCount(b *testing.B, fn func(b *testing.B, routes []slowPrefixEntry[int])) {
for _, fam := range []string{"ipv4", "ipv6"} {
rng := randomPrefixes4
if fam == "ipv6" {
rng = randomPrefixes6
}
b.Run(fam, func(b *testing.B) {
for _, nroutes := range benchRouteCount {
routes := rng(nroutes)
b.Run(fmt.Sprint(nroutes), func(b *testing.B) {
fn(b, routes)
})
}
})
}
}
func BenchmarkTableInsertion(b *testing.B) {
forFamilyAndCount(b, func(b *testing.B, routes []slowPrefixEntry[int]) {
b.StopTimer()
b.ResetTimer()
var startMem, endMem runtime.MemStats
runtime.ReadMemStats(&startMem)
b.StartTimer()
for i := 0; i < b.N; i++ {
var rt Table[int]
for _, route := range routes {
rt.Insert(route.pfx, route.val)
}
}
b.StopTimer()
runtime.ReadMemStats(&endMem)
inserts := float64(b.N) * float64(len(routes))
allocs := float64(endMem.Mallocs - startMem.Mallocs)
bytes := float64(endMem.TotalAlloc - startMem.TotalAlloc)
elapsed := float64(b.Elapsed().Nanoseconds())
elapsedSec := b.Elapsed().Seconds()
b.ReportMetric(elapsed/inserts, "ns/op")
b.ReportMetric(inserts/elapsedSec, "routes/s")
b.ReportMetric(roundFloat64(allocs/inserts), "avg-allocs/op")
b.ReportMetric(roundFloat64(bytes/inserts), "avg-B/op")
})
}
func BenchmarkTableDelete(b *testing.B) {
forFamilyAndCount(b, func(b *testing.B, routes []slowPrefixEntry[int]) {
// Collect memstats for one round of insertions, so we can remove it
// from the total at the end and get only the deletion alloc count.
insertAllocs, insertBytes := getMemCost(func() {
var rt Table[int]
for _, route := range routes {
rt.Insert(route.pfx, route.val)
}
})
insertAllocs *= float64(b.N)
insertBytes *= float64(b.N)
var t runningTimer
allocs, bytes := getMemCost(func() {
for i := 0; i < b.N; i++ {
var rt Table[int]
for _, route := range routes {
rt.Insert(route.pfx, route.val)
}
t.Start()
for _, route := range routes {
rt.Delete(route.pfx)
}
t.Stop()
}
})
inserts := float64(b.N) * float64(len(routes))
allocs -= insertAllocs
bytes -= insertBytes
elapsed := float64(t.Elapsed().Nanoseconds())
elapsedSec := t.Elapsed().Seconds()
b.ReportMetric(elapsed/inserts, "ns/op")
b.ReportMetric(inserts/elapsedSec, "routes/s")
b.ReportMetric(roundFloat64(allocs/inserts), "avg-allocs/op")
b.ReportMetric(roundFloat64(bytes/inserts), "avg-B/op")
})
}
var addrSink netip.Addr
func BenchmarkTableGet(b *testing.B) {
forFamilyAndCount(b, func(b *testing.B, routes []slowPrefixEntry[int]) {
genAddr := randomAddr4
if routes[0].pfx.Addr().Is6() {
genAddr = randomAddr6
}
var rt Table[int]
for _, route := range routes {
rt.Insert(route.pfx, route.val)
}
addrAllocs, addrBytes := getMemCost(func() {
// Have to run genAddr more than once, otherwise the reported
// cost is 16 bytes - presumably due to some amortized costs in
// the memory allocator? Either way, empirically 100 iterations
// reliably reports the correct cost.
for i := 0; i < 100; i++ {
_ = genAddr()
}
})
addrAllocs /= 100
addrBytes /= 100
var t runningTimer
allocs, bytes := getMemCost(func() {
for i := 0; i < b.N; i++ {
addr := genAddr()
t.Start()
writeSink, _ = rt.Get(addr)
t.Stop()