summaryrefslogtreecommitdiff
path: root/src/udev/udev-builtin-net_id.c
blob: 5e2b69d6f74d001ebec3df092789e5d7ebd8e79f (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
/* SPDX-License-Identifier: LGPL-2.1-or-later */

/*
 * Predictable network interface device names based on:
 *  - firmware/bios-provided index numbers for on-board devices
 *  - firmware-provided pci-express hotplug slot index number
 *  - physical/geographical location of the hardware
 *  - the interface's MAC address
 *
 * https://systemd.io/PREDICTABLE_INTERFACE_NAMES
 *
 * When the code here is changed, man/systemd.net-naming-scheme.xml must be updated too.
 */

#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <stdarg.h>
#include <unistd.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/pci_regs.h>

#include "alloc-util.h"
#include "chase.h"
#include "device-private.h"
#include "device-util.h"
#include "dirent-util.h"
#include "ether-addr-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "glyph-util.h"
#include "netif-naming-scheme.h"
#include "parse-util.h"
#include "proc-cmdline.h"
#include "stdio-util.h"
#include "string-util.h"
#include "strv.h"
#include "strxcpyx.h"
#include "udev-builtin.h"

#define ONBOARD_14BIT_INDEX_MAX ((1U << 14) - 1)
#define ONBOARD_16BIT_INDEX_MAX ((1U << 16) - 1)

typedef enum NetNameType {
        NET_UNDEF,
        NET_PCI,
        NET_USB,
        NET_BCMA,
        NET_VIRTIO,
        NET_CCW,
        NET_VIO,
        NET_XENVIF,
        NET_PLATFORM,
        NET_NETDEVSIM,
        NET_DEVICETREE,
} NetNameType;

typedef struct NetNames {
        NetNameType type;

        sd_device *pcidev;
        char pci_slot[ALTIFNAMSIZ];
        char pci_path[ALTIFNAMSIZ];
        char pci_onboard[ALTIFNAMSIZ];
        const char *pci_onboard_label;

        char usb_ports[ALTIFNAMSIZ];
        char bcma_core[ALTIFNAMSIZ];
        char ccw_busid[ALTIFNAMSIZ];
        char vio_slot[ALTIFNAMSIZ];
        char xen_slot[ALTIFNAMSIZ];
        char platform_path[ALTIFNAMSIZ];
        char netdevsim_path[ALTIFNAMSIZ];
        char devicetree_onboard[ALTIFNAMSIZ];
} NetNames;

typedef struct LinkInfo {
        int ifindex;
        int iflink;
        int iftype;
        const char *devtype;
        const char *phys_port_name;
        struct hw_addr_data hw_addr;
} LinkInfo;

/* skip intermediate virtio devices */
static sd_device *skip_virtio(sd_device *dev) {
        /* there can only ever be one virtio bus per parent device, so we can
         * safely ignore any virtio buses. see
         * http://lists.linuxfoundation.org/pipermail/virtualization/2015-August/030331.html */
        while (dev) {
                const char *subsystem;

                if (sd_device_get_subsystem(dev, &subsystem) < 0)
                        break;

                if (!streq(subsystem, "virtio"))
                        break;

                if (sd_device_get_parent(dev, &dev) < 0)
                        return NULL;
        }

        return dev;
}

static int get_virtfn_info(sd_device *pcidev, sd_device **ret_physfn_pcidev, char **ret_suffix) {
        _cleanup_(sd_device_unrefp) sd_device *physfn_pcidev = NULL;
        const char *syspath, *name;
        sd_device *child;
        int r;

        assert(pcidev);
        assert(ret_physfn_pcidev);
        assert(ret_suffix);

        r = sd_device_get_syspath(pcidev, &syspath);
        if (r < 0)
                return r;

        /* Get physical function's pci device. */
        r = sd_device_new_child(&physfn_pcidev, pcidev, "physfn");
        if (r < 0)
                return r;

        /* Find the virtual function number by finding the right virtfn link. */
        FOREACH_DEVICE_CHILD_WITH_SUFFIX(physfn_pcidev, child, name) {
                const char *n, *s;

                /* Only accepts e.g. virtfn0, virtfn1, and so on. */
                n = startswith(name, "virtfn");
                if (isempty(n) || !in_charset(n, DIGITS))
                        continue;

                if (sd_device_get_syspath(child, &s) < 0)
                        continue;

                if (streq(s, syspath)) {
                        char *suffix;

                        suffix = strjoin("v", n);
                        if (!suffix)
                                return -ENOMEM;

                        *ret_physfn_pcidev = sd_device_ref(physfn_pcidev);
                        *ret_suffix = suffix;
                        return 0;
                }
        }

        return -ENOENT;
}

static bool is_valid_onboard_index(unsigned long idx) {
        /* Some BIOSes report rubbish indexes that are excessively high (2^24-1 is an index VMware likes to
         * report for example). Let's define a cut-off where we don't consider the index reliable anymore. We
         * pick some arbitrary cut-off, which is somewhere beyond the realistic number of physical network
         * interface a system might have. Ideally the kernel would already filter this crap for us, but it
         * doesn't currently. The initial cut-off value (2^14-1) was too conservative for s390 PCI which
         * allows for index values up 2^16-1 which is now enabled with the NAMING_16BIT_INDEX naming flag. */
        return idx <= (naming_scheme_has(NAMING_16BIT_INDEX) ? ONBOARD_16BIT_INDEX_MAX : ONBOARD_14BIT_INDEX_MAX);
}

/* retrieve on-board index number and label from firmware */
static int dev_pci_onboard(sd_device *dev, const LinkInfo *info, NetNames *names) {
        unsigned long idx, dev_port = 0;
        const char *attr;
        size_t l;
        char *s;
        int r;

        assert(dev);
        assert(info);
        assert(names);

        /* ACPI _DSM — device specific method for naming a PCI or PCI Express device */
        if (sd_device_get_sysattr_value(names->pcidev, "acpi_index", &attr) >= 0)
                log_device_debug(names->pcidev, "acpi_index=%s", attr);
        else {
                /* SMBIOS type 41 — Onboard Devices Extended Information */
                r = sd_device_get_sysattr_value(names->pcidev, "index", &attr);
                if (r < 0)
                        return r;
                log_device_debug(names->pcidev, "index=%s", attr);
        }

        r = safe_atolu(attr, &idx);
        if (r < 0)
                return log_device_debug_errno(names->pcidev, r,
                                              "Failed to parse onboard index \"%s\": %m", attr);
        if (idx == 0 && !naming_scheme_has(NAMING_ZERO_ACPI_INDEX))
                return log_device_debug_errno(names->pcidev, SYNTHETIC_ERRNO(EINVAL),
                                              "Naming scheme does not allow onboard index==0.");
        if (!is_valid_onboard_index(idx))
                return log_device_debug_errno(names->pcidev, SYNTHETIC_ERRNO(ENOENT),
                                              "Not a valid onboard index: %lu", idx);

        /* kernel provided port index for multiple ports on a single PCI function */
        if (sd_device_get_sysattr_value(dev, "dev_port", &attr) >= 0) {
                r = safe_atolu_full(attr, 10, &dev_port);
                if (r < 0)
                        log_device_debug_errno(dev, r, "Failed to parse dev_port, ignoring: %m");
                log_device_debug(dev, "dev_port=%lu", dev_port);
        }

        s = names->pci_onboard;
        l = sizeof(names->pci_onboard);
        l = strpcpyf(&s, l, "o%lu", idx);
        if (!isempty(info->phys_port_name))
                /* kernel provided front panel port name for multiple port PCI device */
                l = strpcpyf(&s, l, "n%s", info->phys_port_name);
        else if (dev_port > 0)
                l = strpcpyf(&s, l, "d%lu", dev_port);
        if (l == 0)
                names->pci_onboard[0] = '\0';
        log_device_debug(dev, "Onboard index identifier: index=%lu phys_port=%s dev_port=%lu %s %s",
                         idx, strempty(info->phys_port_name), dev_port,
                         special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), empty_to_na(names->pci_onboard));

        if (sd_device_get_sysattr_value(names->pcidev, "label", &names->pci_onboard_label) >= 0)
                log_device_debug(dev, "Onboard label from PCI device: %s", names->pci_onboard_label);
        else
                names->pci_onboard_label = NULL;

        return 0;
}

/* read the 256 bytes PCI configuration space to check the multi-function bit */
static int is_pci_multifunction(sd_device *dev) {
        _cleanup_free_ uint8_t *config = NULL;
        const char *filename, *syspath;
        size_t len;
        int r;

        r = sd_device_get_syspath(dev, &syspath);
        if (r < 0)
                return r;

        filename = strjoina(syspath, "/config");
        r = read_virtual_file(filename, PCI_HEADER_TYPE + 1, (char **) &config, &len);
        if (r < 0)
                return r;
        if (len < PCI_HEADER_TYPE + 1)
                return -EINVAL;

#ifndef PCI_HEADER_TYPE_MULTIFUNC
#define PCI_HEADER_TYPE_MULTIFUNC 0x80
#endif

        /* bit 0-6 header type, bit 7 multi/single function device */
        return config[PCI_HEADER_TYPE] & PCI_HEADER_TYPE_MULTIFUNC;
}

static bool is_pci_ari_enabled(sd_device *dev) {
        const char *a;

        if (sd_device_get_sysattr_value(dev, "ari_enabled", &a) < 0)
                return false;

        return streq(a, "1");
}

static bool is_pci_bridge(sd_device *dev) {
        const char *v, *p;

        if (sd_device_get_sysattr_value(dev, "modalias", &v) < 0)
                return false;

        if (!startswith(v, "pci:"))
                return false;

        p = strrchr(v, 's');
        if (!p)
                return false;
        if (p[1] != 'c')
                return false;

        /* PCI device subclass 04 corresponds to PCI bridge */
        bool b = strneq(p + 2, "04", 2);
        if (b)
                log_device_debug(dev, "Device is a PCI bridge.");
        return b;
}

static int parse_hotplug_slot_from_function_id(sd_device *dev, int slots_dirfd, uint32_t *ret) {
        uint64_t function_id;
        char filename[NAME_MAX+1];
        const char *attr;
        int r;

        /* The <sysname>/function_id attribute is unique to the s390 PCI driver. If present, we know
         * that the slot's directory name for this device is /sys/bus/pci/XXXXXXXX/ where XXXXXXXX is
         * the fixed length 8 hexadecimal character string representation of function_id. Therefore we
         * can short cut here and just check for the existence of the slot directory. As this directory
         * has to exist, we're emitting a debug message for the unlikely case it's not found. Note that
         * the domain part doesn't belong to the slot name here because there's a 1-to-1 relationship
         * between PCI function and its hotplug slot. */

        assert(dev);
        assert(slots_dirfd >= 0);
        assert(ret);

        if (!naming_scheme_has(NAMING_SLOT_FUNCTION_ID))
                return 0;

        if (sd_device_get_sysattr_value(dev, "function_id", &attr) < 0)
                return 0;

        r = safe_atou64(attr, &function_id);
        if (r < 0)
                return log_device_debug_errno(dev, r, "Failed to parse function_id, ignoring: %s", attr);

        if (function_id <= 0 || function_id > UINT32_MAX)
                return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL),
                                              "Invalid function id (0x%"PRIx64"), ignoring.",
                                              function_id);

        if (!snprintf_ok(filename, sizeof(filename), "%08"PRIx64, function_id))
                return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ENAMETOOLONG),
                                              "PCI slot path is too long, ignoring.");

        if (faccessat(slots_dirfd, filename, F_OK, 0) < 0)
                return log_device_debug_errno(dev, errno, "Cannot access %s under pci slots, ignoring: %m", filename);

        *ret = (uint32_t) function_id;
        return 1;
}

static int dev_pci_slot(sd_device *dev, const LinkInfo *info, NetNames *names) {
        const char *sysname, *attr;
        _cleanup_(sd_device_unrefp) sd_device *pci = NULL;
        _cleanup_closedir_ DIR *dir = NULL;
        unsigned domain, bus, slot, func;
        sd_device *hotplug_slot_dev;
        unsigned long dev_port = 0;
        uint32_t hotplug_slot = 0;
        size_t l;
        char *s;
        int r;

        assert(dev);
        assert(info);
        assert(names);

        r = sd_device_get_sysname(names->pcidev, &sysname);
        if (r < 0)
                return log_device_debug_errno(names->pcidev, r, "Failed to get sysname: %m");

        r = sscanf(sysname, "%x:%x:%x.%u", &domain, &bus, &slot, &func);
        log_device_debug(dev, "Parsing slot information from PCI device sysname \"%s\": %s",
                         sysname, r == 4 ? "success" : "failure");
        if (r != 4)
                return -ENOENT;

        if (naming_scheme_has(NAMING_NPAR_ARI) &&
            is_pci_ari_enabled(names->pcidev))
                /* ARI devices support up to 256 functions on a single device ("slot"), and interpret the
                 * traditional 5-bit slot and 3-bit function number as a single 8-bit function number,
                 * where the slot makes up the upper 5 bits. */
                func += slot * 8;

        /* kernel provided port index for multiple ports on a single PCI function */
        if (sd_device_get_sysattr_value(dev, "dev_port", &attr) >= 0) {
                log_device_debug(dev, "dev_port=%s", attr);

                r = safe_atolu_full(attr, 10, &dev_port);
                if (r < 0)
                        log_device_debug_errno(dev, r, "Failed to parse attribute dev_port, ignoring: %m");

                /* With older kernels IP-over-InfiniBand network interfaces sometimes erroneously
                 * provide the port number in the 'dev_id' sysfs attribute instead of 'dev_port',
                 * which thus stays initialized as 0. */
                if (dev_port == 0 &&
                    info->iftype == ARPHRD_INFINIBAND &&
                    sd_device_get_sysattr_value(dev, "dev_id", &attr) >= 0) {
                        log_device_debug(dev, "dev_id=%s", attr);

                        r = safe_atolu_full(attr, 10, &dev_port);
                        if (r < 0)
                                log_device_debug_errno(dev, r, "Failed to parse attribute dev_id, ignoring: %m");
                }
        }

        /* compose a name based on the raw kernel's PCI bus, slot numbers */
        s = names->pci_path;
        l = sizeof(names->pci_path);
        if (domain > 0)
                l = strpcpyf(&s, l, "P%u", domain);
        l = strpcpyf(&s, l, "p%us%u", bus, slot);
        if (func > 0 || is_pci_multifunction(names->pcidev) > 0)
                l = strpcpyf(&s, l, "f%u", func);
        if (!isempty(info->phys_port_name))
                /* kernel provided front panel port name for multi-port PCI device */
                l = strpcpyf(&s, l, "n%s", info->phys_port_name);
        else if (dev_port > 0)
                l = strpcpyf(&s, l, "d%lu", dev_port);
        if (l == 0)
                names->pci_path[0] = '\0';

        log_device_debug(dev, "PCI path identifier: domain=%u bus=%u slot=%u func=%u phys_port=%s dev_port=%lu %s %s",
                         domain, bus, slot, func, strempty(info->phys_port_name), dev_port,
                         special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), empty_to_na(names->pci_path));

        /* ACPI _SUN — slot user number */
        r = sd_device_new_from_subsystem_sysname(&pci, "subsystem", "pci");
        if (r < 0)
                return log_debug_errno(r, "sd_device_new_from_subsystem_sysname() failed: %m");

        r = device_opendir(pci, "slots", &dir);
        if (r < 0)
                return log_device_debug_errno(dev, r, "Cannot access 'slots' subdirectory: %m");

        hotplug_slot_dev = names->pcidev;
        while (hotplug_slot_dev) {
                r = parse_hotplug_slot_from_function_id(hotplug_slot_dev, dirfd(dir), &hotplug_slot);
                if (r < 0)
                        return 0;
                if (r > 0) {
                        domain = 0; /* See comments in parse_hotplug_slot_from_function_id(). */
                        break;
                }

                r = sd_device_get_sysname(hotplug_slot_dev, &sysname);
                if (r < 0)
                        return log_device_debug_errno(hotplug_slot_dev, r, "Failed to get sysname: %m");

                FOREACH_DIRENT_ALL(de, dir, break) {
                        _cleanup_free_ char *path = NULL;
                        const char *address;
                        uint32_t i;

                        if (dot_or_dot_dot(de->d_name))
                                continue;

                        r = safe_atou32(de->d_name, &i);
                        if (r < 0 || i <= 0)
                                continue;

                        path = path_join("slots", de->d_name, "address");
                        if (!path)
                                return -ENOMEM;

                        if (sd_device_get_sysattr_value(pci, path, &address) < 0)
                                continue;

                        /* match slot address with device by stripping the function */
                        if (!startswith(sysname, address))
                                continue;

                        hotplug_slot = i;

                        /* We found the match between PCI device and slot. However, we won't use the slot
                         * index if the device is a PCI bridge, because it can have other child devices that
                         * will try to claim the same index and that would create name collision. */
                        if (naming_scheme_has(NAMING_BRIDGE_NO_SLOT) && is_pci_bridge(hotplug_slot_dev)) {
                                if (naming_scheme_has(NAMING_BRIDGE_MULTIFUNCTION_SLOT) && is_pci_multifunction(names->pcidev) <= 0) {
                                        log_device_debug(dev,
                                                         "Not using slot information because the PCI device associated with "
                                                         "the hotplug slot is a bridge and the PCI device has a single function.");
                                        return 0;
                                }

                                if (!naming_scheme_has(NAMING_BRIDGE_MULTIFUNCTION_SLOT)) {
                                        log_device_debug(dev, "Not using slot information because the PCI device is a bridge.");
                                        return 0;
                                }
                        }

                        break;
                }
                if (hotplug_slot > 0)
                        break;
                if (sd_device_get_parent_with_subsystem_devtype(hotplug_slot_dev, "pci", NULL, &hotplug_slot_dev) < 0)
                        break;
                rewinddir(dir);
        }

        if (hotplug_slot > 0) {
                s = names->pci_slot;
                l = sizeof(names->pci_slot);
                if (domain > 0)
                        l = strpcpyf(&s, l, "P%u", domain);
                l = strpcpyf(&s, l, "s%"PRIu32, hotplug_slot);
                if (func > 0 || is_pci_multifunction(names->pcidev) > 0)
                        l = strpcpyf(&s, l, "f%u", func);
                if (!isempty(info->phys_port_name))
                        l = strpcpyf(&s, l, "n%s", info->phys_port_name);
                else if (dev_port > 0)
                        l = strpcpyf(&s, l, "d%lu", dev_port);
                if (l == 0)
                        names->pci_slot[0] = '\0';

                log_device_debug(dev, "Slot identifier: domain=%u slot=%"PRIu32" func=%u phys_port=%s dev_port=%lu %s %s",
                                 domain, hotplug_slot, func, strempty(info->phys_port_name), dev_port,
                                 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), empty_to_na(names->pci_slot));
        }

        return 0;
}

static int names_vio(sd_device *dev, NetNames *names) {
        sd_device *parent;
        unsigned busid, slotid, ethid;
        const char *syspath, *subsystem;
        int r;

        /* check if our direct parent is a VIO device with no other bus in-between */
        r = sd_device_get_parent(dev, &parent);
        if (r < 0)
                return log_device_debug_errno(dev, r, "sd_device_get_parent() failed: %m");

        r = sd_device_get_subsystem(parent, &subsystem);
        if (r < 0)
                return log_device_debug_errno(parent, r, "sd_device_get_subsystem() failed: %m");
        if (!streq("vio", subsystem))
                return -ENOENT;
        log_device_debug(dev, "Parent device is in the vio subsystem.");

        /* The devices' $DEVPATH number is tied to (virtual) hardware (slot id
         * selected in the HMC), thus this provides a reliable naming (e.g.
         * "/devices/vio/30000002/net/eth1"); we ignore the bus number, as
         * there should only ever be one bus, and then remove leading zeros. */
        r = sd_device_get_syspath(dev, &syspath);
        if (r < 0)
                return log_device_debug_errno(dev, r, "sd_device_get_syspath() failed: %m");

        r = sscanf(syspath, "/sys/devices/vio/%4x%4x/net/eth%u", &busid, &slotid, &ethid);
        log_device_debug(dev, "Parsing vio slot information from syspath \"%s\": %s",
                         syspath, r == 3 ? "success" : "failure");
        if (r != 3)
                return -EINVAL;

        xsprintf(names->vio_slot, "v%u", slotid);
        names->type = NET_VIO;
        log_device_debug(dev, "Vio slot identifier: slotid=%u %s %s",
                         slotid, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), names->vio_slot);
        return 0;
}

#define PLATFORM_TEST "/sys/devices/platform/vvvvPPPP"
#define PLATFORM_PATTERN4 "/sys/devices/platform/%4s%4x:%2x/net/eth%u"
#define PLATFORM_PATTERN3 "/sys/devices/platform/%3s%4x:%2x/net/eth%u"

static int names_platform(sd_device *dev, NetNames *names, bool test) {
        sd_device *parent;
        char vendor[5];
        unsigned model, instance, ethid;
        const char *syspath, *pattern, *validchars, *subsystem;
        int r;

        /* check if our direct parent is a platform device with no other bus in-between */
        r = sd_device_get_parent(dev, &parent);
        if (r < 0)
                return log_device_debug_errno(dev, r, "sd_device_get_parent() failed: %m");

        r = sd_device_get_subsystem(parent, &subsystem);
        if (r < 0)
                return log_device_debug_errno(parent, r, "sd_device_get_subsystem() failed: %m");

        if (!streq("platform", subsystem))
                 return -ENOENT;
        log_device_debug(dev, "Parent device is in the platform subsystem.");

        r = sd_device_get_syspath(dev, &syspath);
        if (r < 0)
                return log_device_debug_errno(dev, r, "sd_device_get_syspath() failed: %m");

        /* syspath is too short, to have a valid ACPI instance */
        if (strlen(syspath) < STRLEN(PLATFORM_TEST) + 1)
                return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL),
                                              "Syspath \"%s\" is too short for a valid ACPI instance.",
                                              syspath);

        /* Vendor ID can be either PNP ID (3 chars A-Z) or ACPI ID (4 chars A-Z and numerals) */
        if (syspath[STRLEN(PLATFORM_TEST)] == ':') {
                pattern = PLATFORM_PATTERN4;
                validchars = UPPERCASE_LETTERS DIGITS;
        } else {
                pattern = PLATFORM_PATTERN3;
                validchars = UPPERCASE_LETTERS;
        }

        /* Platform devices are named after ACPI table match, and instance id
         * eg. "/sys/devices/platform/HISI00C2:00");
         * The Vendor (3 or 4 char), followed by hexadecimal model number : instance id. */

        DISABLE_WARNING_FORMAT_NONLITERAL;
        r = sscanf(syspath, pattern, vendor, &model, &instance, &ethid);
        REENABLE_WARNING;
        log_device_debug(dev, "Parsing platform device information from syspath \"%s\": %s",
                         syspath, r == 4 ? "success" : "failure");
        if (r != 4)
                return -EINVAL;

        if (!in_charset(vendor, validchars))
                return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ENOENT),
                                              "Platform vendor contains invalid characters: %s", vendor);

        ascii_strlower(vendor);

        xsprintf(names->platform_path, "a%s%xi%u", vendor, model, instance);
        names->type = NET_PLATFORM;
        log_device_debug(dev, "Platform identifier: vendor=%s model=%u instance=%u %s %s",
                         vendor, model, instance, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), names->platform_path);
        return 0;
}

static int dev_devicetree_onboard(sd_device *dev, NetNames *names) {
        _cleanup_(sd_device_unrefp) sd_device *aliases_dev = NULL, *ofnode_dev = NULL, *devicetree_dev = NULL;
        const char *alias, *ofnode_path, *ofnode_syspath, *devicetree_syspath;
        sd_device *parent;
        int r;

        if (!naming_scheme_has(NAMING_DEVICETREE_ALIASES))
                return 0;

        /* check if our direct parent has an of_node */
        r = sd_device_get_parent(dev, &parent);
        if (r < 0)
                return r;

        r = sd_device_new_child(&ofnode_dev, parent, "of_node");
        if (r < 0)
                return r;

        r = sd_device_get_syspath(ofnode_dev, &ofnode_syspath);
        if (r < 0)
                return r;

        /* /proc/device-tree should be a symlink to /sys/firmware/devicetree/base. */
        r = sd_device_new_from_path(&devicetree_dev, "/proc/device-tree");
        if (r < 0)
                return r;

        r = sd_device_get_syspath(devicetree_dev, &devicetree_syspath);
        if (r < 0)
                return r;

        /*
         * Example paths:
         * devicetree_syspath = /sys/firmware/devicetree/base
         * ofnode_syspath = /sys/firmware/devicetree/base/soc/ethernet@deadbeef
         * ofnode_path = soc/ethernet@deadbeef
         */
        ofnode_path = path_startswith(ofnode_syspath, devicetree_syspath);
        if (!ofnode_path)
                return -ENOENT;

        /* Get back our leading / to match the contents of the aliases */
        ofnode_path--;
        assert(path_is_absolute(ofnode_path));

        r = sd_device_new_child(&aliases_dev, devicetree_dev, "aliases");
        if (r < 0)
                return r;

        FOREACH_DEVICE_SYSATTR(aliases_dev, alias) {
                const char *alias_path, *alias_index, *conflict;
                unsigned i;

                alias_index = startswith(alias, "ethernet");
                if (!alias_index)
                        continue;

                if (sd_device_get_sysattr_value(aliases_dev, alias, &alias_path) < 0)
                        continue;

                if (!path_equal(ofnode_path, alias_path))
                        continue;

                /* If there's no index, we default to 0... */
                if (isempty(alias_index)) {
                        i = 0;
                        conflict = "ethernet0";
                } else {
                        r = safe_atou(alias_index, &i);
                        if (r < 0)
                                return log_device_debug_errno(dev, r,
                                                "Could not get index of alias %s: %m", alias);
                        conflict = "ethernet";
                }

                /* ...but make sure we don't have an alias conflict */
                if (i == 0 && sd_device_get_sysattr_value(aliases_dev, conflict, NULL) >= 0)
                        return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EEXIST),
                                        "Ethernet alias conflict: ethernet and ethernet0 both exist");

                xsprintf(names->devicetree_onboard, "d%u", i);
                names->type = NET_DEVICETREE;
                return 0;
        }

        return -ENOENT;
}

static int names_pci(sd_device *dev, const LinkInfo *info, NetNames *names) {
        _cleanup_(sd_device_unrefp) sd_device *physfn_pcidev = NULL;
        _cleanup_free_ char *virtfn_suffix = NULL;
        sd_device *parent;
        const char *subsystem;
        int r;

        assert(dev);
        assert(info);
        assert(names);

        r = sd_device_get_parent(dev, &parent);
        if (r < 0)
                return r;
        /* skip virtio subsystem if present */
        parent = skip_virtio(parent);

        if (!parent)
                return -ENOENT;

        /* check if our direct parent is a PCI device with no other bus in-between */
        if (sd_device_get_subsystem(parent, &subsystem) >= 0 &&
            streq("pci", subsystem)) {
                names->type = NET_PCI;
                names->pcidev = parent;
        } else {
                r = sd_device_get_parent_with_subsystem_devtype(dev, "pci", NULL, &names->pcidev);
                if (r < 0)
                        return r;
        }

        if (naming_scheme_has(NAMING_SR_IOV_V) &&
            get_virtfn_info(names->pcidev, &physfn_pcidev, &virtfn_suffix) >= 0) {
                NetNames vf_names = {};

                /* If this is an SR-IOV virtual device, get base name using physical device and add virtfn suffix. */
                vf_names.pcidev = physfn_pcidev;
                dev_pci_onboard(dev, info, &vf_names);
                dev_pci_slot(dev, info, &vf_names);

                if (vf_names.pci_onboard[0])
                        if (strlen(vf_names.pci_onboard) + strlen(virtfn_suffix) < sizeof(names->pci_onboard))
                                strscpyl(names->pci_onboard, sizeof(names->pci_onboard),
                                         vf_names.pci_onboard, virtfn_suffix, NULL);
                if (vf_names.pci_slot[0])
                        if (strlen(vf_names.pci_slot) + strlen(virtfn_suffix) < sizeof(names->pci_slot))
                                strscpyl(names->pci_slot, sizeof(names->pci_slot),
                                         vf_names.pci_slot, virtfn_suffix, NULL);
                if (vf_names.pci_path[0])
                        if (strlen(vf_names.pci_path) + strlen(virtfn_suffix) < sizeof(names->pci_path))
                                strscpyl(names->pci_path, sizeof(names->pci_path),
                                         vf_names.pci_path, virtfn_suffix, NULL);
        } else {
                dev_pci_onboard(dev, info, names);
                dev_pci_slot(dev, info, names);
        }

        return 0;
}

static int names_usb(sd_device *dev, NetNames *names) {
        sd_device *usbdev;
        char name[256], *ports, *config, *interf, *s;
        const char *sysname;
        size_t l;
        int r;

        assert(dev);
        assert(names);

        r = sd_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface", &usbdev);
        if (r < 0)
                return log_device_debug_errno(dev, r, "sd_device_get_parent_with_subsystem_devtype() failed: %m");

        r = sd_device_get_sysname(usbdev, &sysname);
        if (r < 0)
                return log_device_debug_errno(usbdev, r, "sd_device_get_sysname() failed: %m");

        /* get USB port number chain, configuration, interface */
        strscpy(name, sizeof(name), sysname);
        s = strchr(name, '-');
        if (!s)
                return log_device_debug_errno(usbdev, SYNTHETIC_ERRNO(EINVAL),
                                              "sysname \"%s\" does not have '-' in the expected place.", sysname);
        ports = s+1;

        s = strchr(ports, ':');
        if (!s)
                return log_device_debug_errno(usbdev, SYNTHETIC_ERRNO(EINVAL),
                                              "sysname \"%s\" does not have ':' in the expected place.", sysname);
        s[0] = '\0';
        config = s+1;

        s = strchr(config, '.');
        if (!s)
                return log_device_debug_errno(usbdev, SYNTHETIC_ERRNO(EINVAL),
                                              "sysname \"%s\" does not have '.' in the expected place.", sysname);
        s[0] = '\0';
        interf = s+1;

        /* prefix every port number in the chain with "u" */
        s = ports;
        while ((s = strchr(s, '.')))
                s[0] = 'u';
        s = names->usb_ports;
        l = strpcpyl(&s, sizeof(names->usb_ports), "u", ports, NULL);

        /* append USB config number, suppress the common config == 1 */
        if (!streq(config, "1"))
                l = strpcpyl(&s, sizeof(names->usb_ports), "c", config, NULL);

        /* append USB interface number, suppress the interface == 0 */
        if (!streq(interf, "0"))
                l = strpcpyl(&s, sizeof(names->usb_ports), "i", interf, NULL);
        if (l == 0)
                return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ENAMETOOLONG),
                                              "Generated USB name would be too long.");
        log_device_debug(dev, "USB name identifier: ports=%.*s config=%s interface=%s %s %s",
                         (int) strlen(ports), sysname + (ports - name), config, interf,
                         special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), names->usb_ports);
        names->type = NET_USB;
        return 0;
}

static int names_bcma(sd_device *dev, NetNames *names) {
        sd_device *bcmadev;
        unsigned core;
        const char *sysname;
        int r;

        assert(dev);
        assert(names);

        r = sd_device_get_parent_with_subsystem_devtype(dev, "bcma", NULL, &bcmadev);
        if (r < 0)
                return log_device_debug_errno(dev, r, "sd_device_get_parent_with_subsystem_devtype() failed: %m");

        r = sd_device_get_sysname(bcmadev, &sysname);
        if (r < 0)
                return log_device_debug_errno(dev, r, "sd_device_get_sysname() failed: %m");

        /* bus num:core num */
        r = sscanf(sysname, "bcma%*u:%u", &core);
        log_device_debug(dev, "Parsing bcma device information from sysname \"%s\": %s",
                         sysname, r == 1 ? "success" : "failure");
        if (r != 1)
                return -EINVAL;
        /* suppress the common core == 0 */
        if (core > 0)
                xsprintf(names->bcma_core, "b%u", core);

        names->type = NET_BCMA;
        log_device_debug(dev, "BCMA core identifier: core=%u %s \"%s\"",
                         core, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), names->bcma_core);
        return 0;
}

static int names_ccw(sd_device *dev, NetNames *names) {
        sd_device *cdev;
        const char *bus_id, *subsys;
        size_t bus_id_start, bus_id_len;
        int r;

        assert(dev);
        assert(names);

        /* Retrieve the associated CCW device */
        r = sd_device_get_parent(dev, &cdev);
        if (r < 0)
                return log_device_debug_errno(dev, r, "sd_device_get_parent() failed: %m");

        /* skip virtio subsystem if present */
        cdev = skip_virtio(cdev);
        if (!cdev)
                return -ENOENT;

        r = sd_device_get_subsystem(cdev, &subsys);
        if (r < 0)
                return log_device_debug_errno(cdev, r, "sd_device_get_subsystem() failed: %m");

        /* Network devices are either single or grouped CCW devices */
        if (!STR_IN_SET(subsys, "ccwgroup", "ccw"))
                return -ENOENT;
        log_device_debug(dev, "Device is CCW.");

        /* Retrieve bus-ID of the CCW device.  The bus-ID uniquely
         * identifies the network device on the Linux on System z channel
         * subsystem.  Note that the bus-ID contains lowercase characters.
         */
        r = sd_device_get_sysname(cdev, &bus_id);
        if (r < 0)
                return log_device_debug_errno(cdev, r, "Failed to get sysname: %m");

        /* Check the length of the bus-ID. Rely on the fact that the kernel provides a correct bus-ID;
         * alternatively, improve this check and parse and verify each bus-ID part...
         */
        bus_id_len = strlen(bus_id);
        if (!IN_SET(bus_id_len, 8, 9))
                return log_device_debug_errno(cdev, SYNTHETIC_ERRNO(EINVAL),
                                              "Invalid bus_id: %s", bus_id);

        /* Strip leading zeros from the bus id for aesthetic purposes. This
         * keeps the ccw names stable, yet much shorter in general case of
         * bus_id 0.0.0600 -> 600. This is similar to e.g. how PCI domain is
         * not prepended when it is zero. Preserve the last 0 for 0.0.0000.
         */
        bus_id_start = strspn(bus_id, ".0");
        bus_id += bus_id_start < bus_id_len ? bus_id_start : bus_id_len - 1;

        /* Store the CCW bus-ID for use as network device name */
        if (!snprintf_ok(names->ccw_busid, sizeof(names->ccw_busid), "c%s", bus_id))
                return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ENAMETOOLONG),
                                              "Generated CCW name would be too long.");
        names->type = NET_CCW;
        log_device_debug(dev, "CCW identifier: ccw_busid=%s %s \"%s\"",
                         bus_id, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), names->ccw_busid);
        return 0;
}

static int names_mac(sd_device *dev, const LinkInfo *info) {
        const char *s;
        unsigned i;
        int r;

        assert(dev);
        assert(info);

        /* The persistent part of a hardware address of an InfiniBand NIC is 8 bytes long. We cannot
         * fit this much in an iface name.
         * TODO: but it can be used as alternative names?? */
        if (info->iftype == ARPHRD_INFINIBAND)
                return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EOPNOTSUPP),
                                              "Not generating MAC name for infiniband device.");
        if (info->hw_addr.length != 6)
                return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EOPNOTSUPP),
                                              "Not generating MAC name for device with MAC address of length %zu.",
                                              info->hw_addr.length);

        /* check for NET_ADDR_PERM, skip random MAC addresses */
        r = sd_device_get_sysattr_value(dev, "addr_assign_type", &s);
        if (r < 0)
                return log_device_debug_errno(dev, r, "Failed to read addr_assign_type: %m");
        r = safe_atou(s, &i);
        if (r < 0)
                return log_device_debug_errno(dev, r, "Failed to parse addr_assign_type: %m");
        if (i != NET_ADDR_PERM)
                return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL),
                                              "addr_assign_type=%u, MAC address is not permanent.", i);
        return 0;
}

static int names_netdevsim(sd_device *dev, const LinkInfo *info, NetNames *names) {
        sd_device *netdevsimdev;
        const char *sysname;
        unsigned addr;
        int r;

        if (!naming_scheme_has(NAMING_NETDEVSIM))
                return 0;

        assert(dev);
        assert(info);
        assert(names);

        if (isempty(info->phys_port_name))
                return -EINVAL;

        r = sd_device_get_parent_with_subsystem_devtype(dev, "netdevsim", NULL, &netdevsimdev);
        if (r < 0)
                return r;
        r = sd_device_get_sysname(netdevsimdev, &sysname);
        if (r < 0)
                return r;

        if (sscanf(sysname, "netdevsim%u", &addr) != 1)
                return -EINVAL;

        if (!snprintf_ok(names->netdevsim_path, sizeof(names->netdevsim_path), "i%un%s", addr, info->phys_port_name))
                return -ENOBUFS;

        names->type = NET_NETDEVSIM;

        return 0;
}

static int names_xen(sd_device *dev, NetNames *names) {
        sd_device *parent;
        unsigned id;
        const char *syspath, *subsystem, *p, *p2;
        int r;

        assert(dev);
        assert(names);

        if (!naming_scheme_has(NAMING_XEN_VIF))
                return 0;

        /* check if our direct parent is a Xen VIF device with no other bus in-between */
        r = sd_device_get_parent(dev, &parent);
        if (r < 0)
                return r;

        /* Do an exact-match on subsystem "xen". This will miss on "xen-backend" on
         * purpose as the VIFs on the backend (dom0) have their own naming scheme
         * which we don't want to affect
         */
        r = sd_device_get_subsystem(parent, &subsystem);
        if (r < 0)
                return r;
        if (!streq("xen", subsystem))
                return -ENOENT;

        /* Use the vif-n name to extract "n" */
        r = sd_device_get_syspath(dev, &syspath);
        if (r < 0)
                return r;

        p = path_startswith(syspath, "/sys/devices/");
        if (!p)
                return -ENOENT;
        p = startswith(p, "vif-");
        if (!p)
                return -ENOENT;
        p2 = strchr(p, '/');
        if (!p2)
                return -ENOENT;
        p = strndupa_safe(p, p2 - p);
        if (!p)
                return -ENOENT;
        r = safe_atou_full(p, SAFE_ATO_REFUSE_PLUS_MINUS | SAFE_ATO_REFUSE_LEADING_ZERO |
                           SAFE_ATO_REFUSE_LEADING_WHITESPACE | 10, &id);
        if (r < 0)
                return r;
        xsprintf(names->xen_slot, "X%u", id);
        names->type = NET_XENVIF;
        return 0;
}

/* IEEE Organizationally Unique Identifier vendor string */
static int ieee_oui(sd_device *dev, const LinkInfo *info, bool test) {
        char str[32];

        assert(dev);
        assert(info);

        if (info->hw_addr.length != 6)
                return -EOPNOTSUPP;

        /* skip commonly misused 00:00:00 (Xerox) prefix */
        if (info->hw_addr.bytes[0] == 0 &&
            info->hw_addr.bytes[1] == 0 &&
            info->hw_addr.bytes[2] == 0)
                return -EINVAL;

        xsprintf(str, "OUI:%02X%02X%02X%02X%02X%02X",
                 info->hw_addr.bytes[0],
                 info->hw_addr.bytes[1],
                 info->hw_addr.bytes[2],
                 info->hw_addr.bytes[3],
                 info->hw_addr.bytes[4],
                 info->hw_addr.bytes[5]);
        return udev_builtin_hwdb_lookup(dev, NULL, str, NULL, test);
}

static int get_link_info(sd_device *dev, LinkInfo *info) {
        const char *s;
        int r;

        assert(dev);
        assert(info);

        r = sd_device_get_ifindex(dev, &info->ifindex);
        if (r < 0)
                return r;

        r = device_get_sysattr_int(dev, "iflink", &info->iflink);
        if (r < 0)
                return r;

        r = device_get_sysattr_int(dev, "type", &info->iftype);
        if (r < 0)
                return r;

        r = sd_device_get_devtype(dev, &info->devtype);
        if (r < 0 && r != -ENOENT)
                return r;

        (void) sd_device_get_sysattr_value(dev, "phys_port_name", &info->phys_port_name);

        r = sd_device_get_sysattr_value(dev, "address", &s);
        if (r < 0 && r != -ENOENT)
                return r;
        if (r >= 0) {
                r = parse_hw_addr(s, &info->hw_addr);
                if (r < 0)
                        log_device_debug_errno(dev, r, "Failed to parse 'address' sysattr, ignoring: %m");
        }

        return 0;
}

static int builtin_net_id(sd_device *dev, sd_netlink **rtnl, int argc, char *argv[], bool test) {
        const char *prefix;
        NetNames names = {};
        LinkInfo info = {};
        int r;

        r = get_link_info(dev, &info);
        if (r < 0)
                return r;

        /* skip stacked devices, like VLANs, ... */
        if (info.ifindex != info.iflink)
                return 0;

        /* handle only ARPHRD_ETHER, ARPHRD_SLIP and ARPHRD_INFINIBAND devices */
        switch (info.iftype) {
        case ARPHRD_ETHER:
                prefix = "en";
                break;
        case ARPHRD_INFINIBAND:
                if (naming_scheme_has(NAMING_INFINIBAND))
                        prefix = "ib";
                else
                        return 0;
                break;
        case ARPHRD_SLIP:
                prefix = "sl";
                break;
        default:
                return 0;
        }

        if (streq_ptr("wlan", info.devtype))
                prefix = "wl";
        else if (streq_ptr("wwan", info.devtype))
                prefix = "ww";

        udev_builtin_add_property(dev, test, "ID_NET_NAMING_SCHEME", naming_scheme()->name);

        if (names_mac(dev, &info) >= 0) {
                char str[ALTIFNAMSIZ];

                xsprintf(str, "%sx%s", prefix, HW_ADDR_TO_STR_FULL(&info.hw_addr, HW_ADDR_TO_STRING_NO_COLON));
                udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str);
                log_device_debug(dev, "MAC address identifier: hw_addr=%s %s %s",
                                 HW_ADDR_TO_STR(&info.hw_addr),
                                 special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), str + strlen(prefix));

                ieee_oui(dev, &info, test);
        }

        /* get devicetree aliases; only ethernet supported for now  */
        if (streq(prefix, "en") && dev_devicetree_onboard(dev, &names) >= 0 &&
            names.type == NET_DEVICETREE) {
                char str[ALTIFNAMSIZ];

                if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.devicetree_onboard))
                        udev_builtin_add_property(dev, test, "ID_NET_NAME_ONBOARD", str);
        }

        /* get path names for Linux on System z network devices */
        if (names_ccw(dev, &names) >= 0 && names.type == NET_CCW) {
                char str[ALTIFNAMSIZ];

                if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.ccw_busid))
                        udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
                return 0;
        }

        /* get ibmveth/ibmvnic slot-based names. */
        if (names_vio(dev, &names) >= 0 && names.type == NET_VIO) {
                char str[ALTIFNAMSIZ];

                if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.vio_slot))
                        udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
                return 0;
        }

        /* get ACPI path names for ARM64 platform devices */
        if (names_platform(dev, &names, test) >= 0 && names.type == NET_PLATFORM) {
                char str[ALTIFNAMSIZ];

                if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.platform_path))
                        udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
                return 0;
        }

        /* get netdevsim path names */
        if (names_netdevsim(dev, &info, &names) >= 0 && names.type == NET_NETDEVSIM) {
                char str[ALTIFNAMSIZ];

                if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.netdevsim_path))
                        udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);

                return 0;
        }

        /* get xen vif "slot" based names. */
        if (names_xen(dev, &names) >= 0 && names.type == NET_XENVIF) {
                char str[ALTIFNAMSIZ];

                if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.xen_slot))
                        udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
                return 0;
        }

        /* get PCI based path names */
        r = names_pci(dev, &info, &names);
        if (r < 0) {
                /*
                 * check for usb devices that are not off pci interfaces to
                 * support various on-chip asics that have usb ports
                 */
                if (r == -ENOENT &&
                    naming_scheme_has(NAMING_USB_HOST) &&
                    names_usb(dev, &names) >= 0 && names.type == NET_USB) {
                        char str[ALTIFNAMSIZ];

                        if (snprintf_ok(str, sizeof str, "%s%s", prefix, names.usb_ports))
                                udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
                }

                return 0;
        }

        /* plain PCI device */
        if (names.type == NET_PCI) {
                char str[ALTIFNAMSIZ];

                if (names.pci_onboard[0] &&
                    snprintf_ok(str, sizeof str, "%s%s", prefix, names.pci_onboard))
                        udev_builtin_add_property(dev, test, "ID_NET_NAME_ONBOARD", str);

                if (names.pci_onboard_label &&
                    snprintf_ok(str, sizeof str, "%s%s",
                                naming_scheme_has(NAMING_LABEL_NOPREFIX) ? "" : prefix,
                                names.pci_onboard_label))
                        udev_builtin_add_property(dev, test, "ID_NET_LABEL_ONBOARD", str);

                if (names.pci_path[0] &&
                    snprintf_ok(str, sizeof str, "%s%s", prefix, names.pci_path))
                        udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);

                if (names.pci_slot[0] &&
                    snprintf_ok(str, sizeof str, "%s%s", prefix, names.pci_slot))
                        udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
                return 0;
        }

        /* USB device */
        if (names_usb(dev, &names) >= 0 && names.type == NET_USB) {
                char str[ALTIFNAMSIZ];

                if (names.pci_path[0] &&
                    snprintf_ok(str, sizeof str, "%s%s%s", prefix, names.pci_path, names.usb_ports))
                        udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);

                if (names.pci_slot[0] &&
                    snprintf_ok(str, sizeof str, "%s%s%s", prefix, names.pci_slot, names.usb_ports))
                        udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
                return 0;
        }

        /* Broadcom bus */
        if (names_bcma(dev, &names) >= 0 && names.type == NET_BCMA) {
                char str[ALTIFNAMSIZ];

                if (names.pci_path[0] &&
                    snprintf_ok(str, sizeof str, "%s%s%s", prefix, names.pci_path, names.bcma_core))
                        udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);

                if (names.pci_slot[0] &&
                    snprintf_ok(str, sizeof str, "%s%s%s", prefix, names.pci_slot, names.bcma_core))
                        udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
                return 0;
        }

        return 0;
}

static int builtin_net_id_init(void) {
        /* Load naming scheme here to suppress log messages in workers. */
        naming_scheme();
        return 0;
}

const UdevBuiltin udev_builtin_net_id = {
        .name = "net_id",
        .cmd = builtin_net_id,
        .init = builtin_net_id_init,
        .help = "Network device properties",
};