-
Notifications
You must be signed in to change notification settings - Fork 2k
/
gnrc_netif.c
1404 lines (1304 loc) · 46.7 KB
/
gnrc_netif.c
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) 2014-2017 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @{
*
* @file
* @author Martine Lenders <m.lenders@fu-berlin.de>
* @author René Kijewski <rene.kijewski@fu-berlin.de>
* @author Oliver Hahm <oliver.hahm@inria.fr>
*/
#include <string.h>
#include "bitfield.h"
#include "net/ethernet.h"
#include "net/ipv6.h"
#include "net/gnrc.h"
#ifdef MODULE_GNRC_IPV6_NIB
#include "net/gnrc/ipv6/nib.h"
#include "net/gnrc/ipv6.h"
#endif /* MODULE_GNRC_IPV6_NIB */
#ifdef MODULE_NETSTATS_IPV6
#include "net/netstats.h"
#endif
#include "fmt.h"
#include "log.h"
#include "sched.h"
#include "net/gnrc/netif.h"
#include "net/gnrc/netif/internal.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
#define _NETIF_NETAPI_MSG_QUEUE_SIZE (8)
static gnrc_netif_t _netifs[GNRC_NETIF_NUMOF];
static void _update_l2addr_from_dev(gnrc_netif_t *netif);
static void _configure_netdev(netdev_t *dev);
static void *_gnrc_netif_thread(void *args);
static void _event_cb(netdev_t *dev, netdev_event_t event);
gnrc_netif_t *gnrc_netif_create(char *stack, int stacksize, char priority,
const char *name, netdev_t *netdev,
const gnrc_netif_ops_t *ops)
{
gnrc_netif_t *netif = NULL;
int res;
for (int i = 0; i < GNRC_NETIF_NUMOF; i++) {
if (_netifs[i].dev == netdev) {
return &_netifs[i];
}
if ((netif == NULL) && (_netifs[i].ops == NULL)) {
netif = &_netifs[i];
}
}
assert(netif != NULL);
rmutex_init(&netif->mutex);
netif->ops = ops;
assert(netif->dev == NULL);
netif->dev = netdev;
res = thread_create(stack, stacksize, priority, THREAD_CREATE_STACKTEST,
_gnrc_netif_thread, (void *)netif, name);
(void)res;
assert(res > 0);
return netif;
}
unsigned gnrc_netif_numof(void)
{
gnrc_netif_t *netif = NULL;
unsigned res = 0;
while ((netif = gnrc_netif_iter(netif))) {
if (netif->ops != NULL) {
res++;
}
}
return res;
}
gnrc_netif_t *gnrc_netif_iter(const gnrc_netif_t *prev)
{
assert((prev == NULL) || (prev >= _netifs));
for (const gnrc_netif_t *netif = (prev == NULL) ? _netifs : (prev + 1);
netif < (_netifs + GNRC_NETIF_NUMOF); netif++) {
if (netif->ops != NULL) {
/* we don't care about external modification */
return (gnrc_netif_t *)netif;
}
}
return NULL;
}
int gnrc_netif_get_from_netdev(gnrc_netif_t *netif, gnrc_netapi_opt_t *opt)
{
int res = -ENOTSUP;
gnrc_netif_acquire(netif);
switch (opt->opt) {
case NETOPT_6LO:
assert(opt->data_len == sizeof(netopt_enable_t));
*((netopt_enable_t *)opt->data) =
(netopt_enable_t)gnrc_netif_is_6lo(netif);
res = sizeof(netopt_enable_t);
break;
case NETOPT_HOP_LIMIT:
assert(opt->data_len == sizeof(uint8_t));
*((uint8_t *)opt->data) = netif->cur_hl;
res = sizeof(uint8_t);
break;
case NETOPT_STATS:
/* XXX discussed this with Oleg, it's supposed to be a pointer */
switch ((int16_t)opt->context) {
#if defined(MODULE_NETSTATS_IPV6) && defined(MODULE_GNRC_IPV6)
case NETSTATS_IPV6:
assert(opt->data_len == sizeof(netstats_t *));
*((netstats_t **)opt->data) = &netif->ipv6.stats;
res = sizeof(&netif->ipv6.stats);
break;
#endif
default:
/* take from device */
break;
}
break;
#ifdef MODULE_GNRC_IPV6
case NETOPT_IPV6_ADDR: {
assert(opt->data_len >= sizeof(ipv6_addr_t));
ipv6_addr_t *tgt = opt->data;
res = 0;
for (unsigned i = 0;
(res < (int)opt->data_len) && (i < GNRC_NETIF_IPV6_ADDRS_NUMOF);
i++) {
if (netif->ipv6.addrs_flags[i] != 0) {
memcpy(tgt, &netif->ipv6.addrs[i], sizeof(ipv6_addr_t));
res += sizeof(ipv6_addr_t);
tgt++;
}
}
}
break;
case NETOPT_IPV6_ADDR_FLAGS: {
assert(opt->data_len >= sizeof(uint8_t));
uint8_t *tgt = opt->data;
res = 0;
for (unsigned i = 0;
(res < (int)opt->data_len) && (i < GNRC_NETIF_IPV6_ADDRS_NUMOF);
i++) {
if (netif->ipv6.addrs_flags[i] != 0) {
*tgt = netif->ipv6.addrs_flags[i];
res += sizeof(uint8_t);
tgt++;
}
}
}
break;
case NETOPT_IPV6_GROUP: {
assert(opt->data_len >= sizeof(ipv6_addr_t));
ipv6_addr_t *tgt = opt->data;
res = 0;
for (unsigned i = 0;
(res < (int)opt->data_len) && (i < GNRC_NETIF_IPV6_GROUPS_NUMOF);
i++) {
if (!ipv6_addr_is_unspecified(&netif->ipv6.groups[i])) {
memcpy(tgt, &netif->ipv6.groups[i], sizeof(ipv6_addr_t));
res += sizeof(ipv6_addr_t);
tgt++;
}
}
}
break;
case NETOPT_IPV6_IID:
assert(opt->data_len >= sizeof(eui64_t));
if (gnrc_netif_ipv6_get_iid(netif, opt->data) == 0) {
res = sizeof(eui64_t);
}
break;
case NETOPT_MAX_PACKET_SIZE:
if (opt->context == GNRC_NETTYPE_IPV6) {
assert(opt->data_len == sizeof(uint16_t));
*((uint16_t *)opt->data) = netif->ipv6.mtu;
res = sizeof(uint16_t);
}
/* else ask device */
break;
#if GNRC_IPV6_NIB_CONF_ROUTER
case NETOPT_IPV6_FORWARDING:
assert(opt->data_len == sizeof(netopt_enable_t));
*((netopt_enable_t *)opt->data) = (gnrc_netif_is_rtr(netif)) ?
NETOPT_ENABLE : NETOPT_DISABLE;
res = sizeof(netopt_enable_t);
break;
case NETOPT_IPV6_SND_RTR_ADV:
assert(opt->data_len == sizeof(netopt_enable_t));
*((netopt_enable_t *)opt->data) = (gnrc_netif_is_rtr_adv(netif)) ?
NETOPT_ENABLE : NETOPT_DISABLE;
res = sizeof(netopt_enable_t);
break;
#endif /* GNRC_IPV6_NIB_CONF_ROUTER */
#endif /* MODULE_GNRC_IPV6 */
#ifdef MODULE_GNRC_SIXLOWPAN_IPHC
case NETOPT_6LO_IPHC:
assert(opt->data_len == sizeof(netopt_enable_t));
*((netopt_enable_t *)opt->data) = (netif->flags & GNRC_NETIF_FLAGS_6LO_HC) ?
NETOPT_ENABLE : NETOPT_DISABLE;
res = sizeof(netopt_enable_t);
break;
#endif /* MODULE_GNRC_SIXLOWPAN_IPHC */
default:
break;
}
if (res == -ENOTSUP) {
res = netif->dev->driver->get(netif->dev, opt->opt, opt->data, opt->data_len);
}
gnrc_netif_release(netif);
return res;
}
int gnrc_netif_set_from_netdev(gnrc_netif_t *netif,
const gnrc_netapi_opt_t *opt)
{
int res = -ENOTSUP;
gnrc_netif_acquire(netif);
switch (opt->opt) {
case NETOPT_HOP_LIMIT:
assert(opt->data_len == sizeof(uint8_t));
netif->cur_hl = *((uint8_t *)opt->data);
res = sizeof(uint8_t);
break;
#ifdef MODULE_GNRC_IPV6
case NETOPT_IPV6_ADDR: {
assert(opt->data_len == sizeof(ipv6_addr_t));
/* always assume manually added */
uint8_t flags = ((((uint8_t)opt->context & 0xff) &
~GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_MASK) |
GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_VALID);
uint8_t pfx_len = (uint8_t)(opt->context >> 8U);
/* acquire locks a recursive mutex so we are safe calling this
* public function */
res = gnrc_netif_ipv6_addr_add_internal(netif, opt->data,
pfx_len, flags);
if (res >= 0) {
res = sizeof(ipv6_addr_t);
}
}
break;
case NETOPT_IPV6_ADDR_REMOVE:
assert(opt->data_len == sizeof(ipv6_addr_t));
/* acquire locks a recursive mutex so we are safe calling this
* public function */
gnrc_netif_ipv6_addr_remove_internal(netif, opt->data);
res = sizeof(ipv6_addr_t);
break;
case NETOPT_IPV6_GROUP:
assert(opt->data_len == sizeof(ipv6_addr_t));
/* acquire locks a recursive mutex so we are safe calling this
* public function */
res = gnrc_netif_ipv6_group_join_internal(netif, opt->data);
if (res >= 0) {
res = sizeof(ipv6_addr_t);
}
break;
case NETOPT_IPV6_GROUP_LEAVE:
assert(opt->data_len == sizeof(ipv6_addr_t));
/* acquire locks a recursive mutex so we are safe calling this
* public function */
gnrc_netif_ipv6_group_leave_internal(netif, opt->data);
res = sizeof(ipv6_addr_t);
break;
case NETOPT_MAX_PACKET_SIZE:
if (opt->context == GNRC_NETTYPE_IPV6) {
assert(opt->data_len == sizeof(uint16_t));
netif->ipv6.mtu = *((uint16_t *)opt->data);
res = sizeof(uint16_t);
}
/* else set device */
break;
#if GNRC_IPV6_NIB_CONF_ROUTER
case NETOPT_IPV6_FORWARDING:
assert(opt->data_len == sizeof(netopt_enable_t));
if (*(((netopt_enable_t *)opt->data)) == NETOPT_ENABLE) {
netif->flags |= GNRC_NETIF_FLAGS_IPV6_FORWARDING;
}
else {
if (gnrc_netif_is_rtr_adv(netif)) {
gnrc_ipv6_nib_change_rtr_adv_iface(netif, false);
}
netif->flags &= ~GNRC_NETIF_FLAGS_IPV6_FORWARDING;
}
res = sizeof(netopt_enable_t);
break;
case NETOPT_IPV6_SND_RTR_ADV:
assert(opt->data_len == sizeof(netopt_enable_t));
gnrc_ipv6_nib_change_rtr_adv_iface(netif,
(*(((netopt_enable_t *)opt->data)) == NETOPT_ENABLE));
res = sizeof(netopt_enable_t);
break;
#endif /* GNRC_IPV6_NIB_CONF_ROUTER */
#endif /* MODULE_GNRC_IPV6 */
#ifdef MODULE_GNRC_SIXLOWPAN_IPHC
case NETOPT_6LO_IPHC:
assert(opt->data_len == sizeof(netopt_enable_t));
if (*(((netopt_enable_t *)opt->data)) == NETOPT_ENABLE) {
netif->flags |= GNRC_NETIF_FLAGS_6LO_HC;
}
else {
netif->flags &= ~GNRC_NETIF_FLAGS_6LO_HC;
}
res = sizeof(netopt_enable_t);
break;
#endif /* MODULE_GNRC_SIXLOWPAN_IPHC */
case NETOPT_RAWMODE:
if (*(((netopt_enable_t *)opt->data)) == NETOPT_ENABLE) {
netif->flags |= GNRC_NETIF_FLAGS_RAWMODE;
}
else {
netif->flags &= ~GNRC_NETIF_FLAGS_RAWMODE;
}
/* Also propagate to the netdev device */
netif->dev->driver->set(netif->dev, NETOPT_RAWMODE, opt->data,
opt->data_len);
res = sizeof(netopt_enable_t);
break;
default:
break;
}
if (res == -ENOTSUP) {
res = netif->dev->driver->set(netif->dev, opt->opt, opt->data,
opt->data_len);
if (res > 0) {
switch (opt->opt) {
case NETOPT_ADDRESS:
case NETOPT_ADDRESS_LONG:
case NETOPT_ADDR_LEN:
case NETOPT_SRC_LEN:
_update_l2addr_from_dev(netif);
break;
case NETOPT_STATE:
if (*((netopt_state_t *)opt->data) == NETOPT_STATE_RESET) {
_configure_netdev(netif->dev);
}
break;
default:
break;
}
}
}
gnrc_netif_release(netif);
return res;
}
gnrc_netif_t *gnrc_netif_get_by_pid(kernel_pid_t pid)
{
gnrc_netif_t *netif = NULL;
while ((netif = gnrc_netif_iter(netif))) {
if (netif->pid == pid) {
return netif;
}
}
return NULL;
}
char *gnrc_netif_addr_to_str(const uint8_t *addr, size_t addr_len, char *out)
{
char *res = out;
assert((out != NULL) && ((addr != NULL) || (addr_len == 0U)));
out[0] = '\0';
for (size_t i = 0; i < addr_len; i++) {
out += fmt_byte_hex((out), *(addr++));
*(out++) = (i == (addr_len - 1)) ? '\0' : ':';
}
return res;
}
static inline int _dehex(char c, int default_)
{
if ('0' <= c && c <= '9') {
return c - '0';
}
else if ('A' <= c && c <= 'F') {
return c - 'A' + 10;
}
else if ('a' <= c && c <= 'f') {
return c - 'a' + 10;
}
else {
return default_;
}
}
size_t gnrc_netif_addr_from_str(const char *str, uint8_t *out)
{
/* Walk over str from the end. */
/* Take two chars a time as one hex value (%hhx). */
/* Leading zeros can be omitted. */
/* Every non-hexadimal character is a delimiter. */
/* Leading, tailing and adjacent delimiters are forbidden. */
const char *end_str = str;
uint8_t *out_end = out;
size_t count = 0;
int assert_cell = 1;
assert(out != NULL);
if ((str == NULL) || (str[0] == '\0')) {
return 0;
}
/* find end of string */
while (end_str[1]) {
++end_str;
}
while (end_str >= str) {
int a = 0, b = _dehex(*end_str--, -1);
if (b < 0) {
if (assert_cell) {
return 0;
}
else {
assert_cell = 1;
continue;
}
}
assert_cell = 0;
if (end_str >= str) {
a = _dehex(*end_str--, 0);
}
count++;
*out_end++ = (a << 4) | b;
}
if (assert_cell) {
return 0;
}
/* out is reversed */
while (out < --out_end) {
uint8_t tmp = *out_end;
*out_end = *out;
*out++ = tmp;
}
return count;
}
void gnrc_netif_acquire(gnrc_netif_t *netif)
{
if (netif && (netif->ops)) {
rmutex_lock(&netif->mutex);
}
}
void gnrc_netif_release(gnrc_netif_t *netif)
{
if (netif && (netif->ops)) {
rmutex_unlock(&netif->mutex);
}
}
#ifdef MODULE_GNRC_IPV6
static inline bool _addr_anycast(const gnrc_netif_t *netif, unsigned idx);
static int _addr_idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr);
static int _group_idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr);
static char addr_str[IPV6_ADDR_MAX_STR_LEN];
/**
* @brief Matches an address by prefix to an address on the interface and
* return length of the best match
*
* @param[in] netif the network interface
* @param[in] addr the address to match
*
* @return bits up to which the best match matches @p addr
* @return 0, if no match was found
*
* @pre `netif != NULL` and `addr != NULL`
*/
static unsigned _match_to_len(const gnrc_netif_t *netif,
const ipv6_addr_t *addr);
/**
* @brief Matches an address by prefix to an address on the interface and
* return index of the best match
*
* @param[in] netif the network interface
* @param[in] addr the address to match
* @param[in] filter a bitfield with the bits at the position equal to the
* indexes of the addresses you want to include in the
* search set to one. NULL for all addresses
*
* @return index of the best match for @p addr
* @return -1 if no match was found
*
* @pre `netif != NULL` and `addr != NULL`
*/
static int _match_to_idx(const gnrc_netif_t *netif,
const ipv6_addr_t *addr,
const uint8_t *filter);
/**
* @brief Determines the scope of the given address.
*
* @param[in] addr The IPv6 address to check.
*
* @return The scope of the address.
*
* @pre address is not loopback or unspecified.
* see http://tools.ietf.org/html/rfc6724#section-4
*/
static uint8_t _get_scope(const ipv6_addr_t *addr);
static inline unsigned _get_state(const gnrc_netif_t *netif, unsigned idx);
/**
* @brief selects potential source address candidates
* @see <a href="http://tools.ietf.org/html/rfc6724#section-4">
* RFC6724, section 4
* </a>
* @param[in] netif the interface used for sending
* @param[in] dst the destination address
* @param[in] ll_only only consider link-local addresses
* @param[out] candidate_set a bitfield representing all addresses
* configured to @p netif, potential candidates
* will be marked as 1
*
* @return -1 if no candidates were found
* @return the index of the first candidate otherwise
*
* @pre the interface entry and its set of addresses must not be changed during
* runtime of this function
*/
static int _create_candidate_set(const gnrc_netif_t *netif,
const ipv6_addr_t *dst, bool ll_only,
uint8_t *candidate_set);
/** @brief Find the best candidate among the configured addresses
* for a certain destination address according to the 8 rules
* specified in RFC 6734, section 5.
* @see <a href="http://tools.ietf.org/html/rfc6724#section-5">
* RFC6724, section 5
* </a>
*
* @param[in] netif The interface for sending.
* @param[in] dst The destination IPv6 address.
* @param[in, out] candidate_set The preselected set of candidate addresses as
* a bitfield.
*
* @pre @p dst is not unspecified.
*
* @return The best matching candidate found on @p netif, may be NULL if none
* is found.
*/
static ipv6_addr_t *_src_addr_selection(gnrc_netif_t *netif,
const ipv6_addr_t *dst,
uint8_t *candidate_set);
int gnrc_netif_ipv6_addr_add_internal(gnrc_netif_t *netif,
const ipv6_addr_t *addr,
unsigned pfx_len, uint8_t flags)
{
unsigned idx = UINT_MAX;
assert((netif != NULL) && (addr != NULL));
assert(!(ipv6_addr_is_multicast(addr) || ipv6_addr_is_unspecified(addr) ||
ipv6_addr_is_loopback(addr)));
assert((pfx_len > 0) && (pfx_len <= 128));
gnrc_netif_acquire(netif);
if ((flags & GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_MASK) ==
GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_TENTATIVE) {
/* set to first retransmission */
flags &= ~GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_TENTATIVE;
flags |= 0x1;
}
for (unsigned i = 0; i < GNRC_NETIF_IPV6_ADDRS_NUMOF; i++) {
if (ipv6_addr_equal(&netif->ipv6.addrs[i], addr)) {
gnrc_netif_release(netif);
return i;
}
if ((idx == UINT_MAX) && (netif->ipv6.addrs_flags[i] == 0)) {
idx = i;
}
}
if (idx == UINT_MAX) {
gnrc_netif_release(netif);
return -ENOMEM;
}
#if GNRC_IPV6_NIB_CONF_ARSM
ipv6_addr_t sol_nodes;
int res;
/* TODO: SHOULD delay join between 0 and MAX_RTR_SOLICITATION_DELAY
* for SLAAC */
ipv6_addr_set_solicited_nodes(&sol_nodes, addr);
res = gnrc_netif_ipv6_group_join_internal(netif, &sol_nodes);
if (res < 0) {
DEBUG("gnrc_netif: Can't join solicited-nodes of %s on interface %" PRIkernel_pid "\n",
ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)),
netif->pid);
return res;
}
#endif /* GNRC_IPV6_NIB_CONF_ARSM */
netif->ipv6.addrs_flags[idx] = flags;
memcpy(&netif->ipv6.addrs[idx], addr, sizeof(netif->ipv6.addrs[idx]));
#ifdef MODULE_GNRC_IPV6_NIB
if (_get_state(netif, idx) == GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_VALID) {
void *state = NULL;
gnrc_ipv6_nib_pl_t ple;
bool in_pl = false;
while (gnrc_ipv6_nib_pl_iter(netif->pid, &state, &ple)) {
if (ipv6_addr_match_prefix(&ple.pfx, addr) >= pfx_len) {
in_pl = true;
}
}
if (!in_pl) {
gnrc_ipv6_nib_pl_set(netif->pid, addr, pfx_len,
UINT32_MAX, UINT32_MAX);
}
}
#if GNRC_IPV6_NIB_CONF_SLAAC
else if (!gnrc_netif_is_6ln(netif)) {
/* cast to remove const qualifier (will still be used NIB internally as
* const) */
msg_t msg = { .type = GNRC_IPV6_NIB_DAD,
.content = { .ptr = &netif->ipv6.addrs[idx] } };
msg_send(&msg, gnrc_ipv6_pid);
}
#endif
#else
(void)pfx_len;
#endif
gnrc_netif_release(netif);
return idx;
}
void gnrc_netif_ipv6_addr_remove_internal(gnrc_netif_t *netif,
const ipv6_addr_t *addr)
{
bool remove_sol_nodes = true;
ipv6_addr_t sol_nodes;
assert((netif != NULL) && (addr != NULL));
ipv6_addr_set_solicited_nodes(&sol_nodes, addr);
gnrc_netif_acquire(netif);
for (unsigned i = 0; i < GNRC_NETIF_IPV6_ADDRS_NUMOF; i++) {
if (ipv6_addr_equal(&netif->ipv6.addrs[i], addr)) {
netif->ipv6.addrs_flags[i] = 0;
ipv6_addr_set_unspecified(&netif->ipv6.addrs[i]);
}
else {
ipv6_addr_t tmp;
ipv6_addr_set_solicited_nodes(&tmp, &netif->ipv6.addrs[i]);
/* there is still an address on the interface with the same
* solicited nodes address */
if (ipv6_addr_equal(&tmp, &sol_nodes)) {
remove_sol_nodes = false;
}
}
}
if (remove_sol_nodes) {
gnrc_netif_ipv6_group_leave_internal(netif, &sol_nodes);
}
gnrc_netif_release(netif);
}
int gnrc_netif_ipv6_addr_idx(gnrc_netif_t *netif,
const ipv6_addr_t *addr)
{
int idx;
assert((netif != NULL) && (addr != NULL));
DEBUG("gnrc_netif: get index of %s from interface %" PRIkernel_pid "\n",
ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)),
netif->pid);
gnrc_netif_acquire(netif);
idx = _addr_idx(netif, addr);
gnrc_netif_release(netif);
return idx;
}
int gnrc_netif_ipv6_addr_match(gnrc_netif_t *netif,
const ipv6_addr_t *addr)
{
assert((netif != NULL) && (addr != NULL));
gnrc_netif_acquire(netif);
int idx = _match_to_idx(netif, addr, NULL);
gnrc_netif_release(netif);
return idx;
}
ipv6_addr_t *gnrc_netif_ipv6_addr_best_src(gnrc_netif_t *netif,
const ipv6_addr_t *dst,
bool ll_only)
{
ipv6_addr_t *best_src = NULL;
BITFIELD(candidate_set, GNRC_NETIF_IPV6_ADDRS_NUMOF);
assert((netif != NULL) && (dst != NULL));
DEBUG("gnrc_netif: get best source address for %s\n",
ipv6_addr_to_str(addr_str, dst, sizeof(addr_str)));
memset(candidate_set, 0, sizeof(candidate_set));
gnrc_netif_acquire(netif);
int first_candidate = _create_candidate_set(netif, dst, ll_only,
candidate_set);
if (first_candidate >= 0) {
best_src = _src_addr_selection(netif, dst, candidate_set);
if (best_src == NULL) {
best_src = &(netif->ipv6.addrs[first_candidate]);
}
}
gnrc_netif_release(netif);
return best_src;
}
gnrc_netif_t *gnrc_netif_get_by_ipv6_addr(const ipv6_addr_t *addr)
{
gnrc_netif_t *netif = NULL;
DEBUG("gnrc_netif: get interface by IPv6 address %s\n",
ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)));
while ((netif = gnrc_netif_iter(netif))) {
if (_addr_idx(netif, addr) >= 0) {
break;
}
if (_group_idx(netif, addr) >= 0) {
break;
}
}
return netif;
}
gnrc_netif_t *gnrc_netif_get_by_prefix(const ipv6_addr_t *prefix)
{
gnrc_netif_t *netif = NULL, *best_netif = NULL;
unsigned best_match = 0;
while ((netif = gnrc_netif_iter(netif))) {
unsigned match;
if (((match = _match_to_len(netif, prefix)) > 0) &&
(match > best_match)) {
best_match = match;
best_netif = netif;
}
}
return best_netif;
}
int gnrc_netif_ipv6_group_join_internal(gnrc_netif_t *netif,
const ipv6_addr_t *addr)
{
unsigned idx = UINT_MAX;
gnrc_netif_acquire(netif);
for (unsigned i = 0; i < GNRC_NETIF_IPV6_GROUPS_NUMOF; i++) {
if (ipv6_addr_equal(&netif->ipv6.groups[i], addr)) {
gnrc_netif_release(netif);
return i;
}
if ((idx == UINT_MAX) && (ipv6_addr_is_unspecified(&netif->ipv6.groups[i]))) {
idx = i;
}
}
if (idx == UINT_MAX) {
gnrc_netif_release(netif);
return -ENOMEM;
}
memcpy(&netif->ipv6.groups[idx], addr, sizeof(netif->ipv6.groups[idx]));
/* TODO:
* - MLD action
*/
gnrc_netif_release(netif);
return idx;
}
void gnrc_netif_ipv6_group_leave_internal(gnrc_netif_t *netif,
const ipv6_addr_t *addr)
{
int idx;
assert((netif != NULL) && (addr != NULL));
gnrc_netif_acquire(netif);
idx = _group_idx(netif, addr);
if (idx >= 0) {
ipv6_addr_set_unspecified(&netif->ipv6.groups[idx]);
/* TODO:
* - MLD action */
}
gnrc_netif_release(netif);
}
int gnrc_netif_ipv6_group_idx(gnrc_netif_t *netif, const ipv6_addr_t *addr)
{
int idx;
assert((netif != NULL) && (addr != NULL));
gnrc_netif_acquire(netif);
idx = _group_idx(netif, addr);
gnrc_netif_release(netif);
return idx;
}
int gnrc_netif_ipv6_get_iid(gnrc_netif_t *netif, eui64_t *eui64)
{
#if GNRC_NETIF_L2ADDR_MAXLEN > 0
if (netif->flags & GNRC_NETIF_FLAGS_HAS_L2ADDR) {
/* the device driver abstraction should be able to provide us with the
* IPV6_IID, so we try this first */
int res = netif->dev->driver->get(netif->dev, NETOPT_IPV6_IID,
eui64, sizeof(eui64_t));
if (res == sizeof(eui64_t)) {
return 0;
}
res = gnrc_netif_ipv6_iid_from_addr(netif,
netif->l2addr, netif->l2addr_len,
eui64);
if (res > 0) {
return 0;
}
}
#endif /* GNRC_NETIF_L2ADDR_MAXLEN > 0 */
return -ENOTSUP;
}
static inline bool _addr_anycast(const gnrc_netif_t *netif, unsigned idx)
{
return (netif->ipv6.addrs_flags[idx] & GNRC_NETIF_IPV6_ADDRS_FLAGS_ANYCAST);
}
static int _idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr, bool mcast)
{
if (!ipv6_addr_is_unspecified(addr)) {
const ipv6_addr_t *iplist = (mcast) ? netif->ipv6.groups : netif->ipv6.addrs;
unsigned ipmax = (mcast) ? GNRC_NETIF_IPV6_GROUPS_NUMOF : GNRC_NETIF_IPV6_ADDRS_NUMOF;
for (unsigned i = 0; i < ipmax; i++) {
if (ipv6_addr_equal(&iplist[i], addr)) {
return i;
}
}
}
return -1;
}
static inline int _addr_idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr)
{
return _idx(netif, addr, false);
}
static inline int _group_idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr)
{
return _idx(netif, addr, true);
}
static unsigned _match_to_len(const gnrc_netif_t *netif,
const ipv6_addr_t *addr)
{
assert((netif != NULL) && (addr != NULL));
int n = _match_to_idx(netif, addr, NULL);
return (n >= 0) ? ipv6_addr_match_prefix(&(netif->ipv6.addrs[n]), addr) : 0;
}
static int _match_to_idx(const gnrc_netif_t *netif,
const ipv6_addr_t *addr,
const uint8_t *filter)
{
assert((netif != NULL) && (addr != NULL));
int idx = -1;
unsigned best_match = 0;
for (int i = 0; i < GNRC_NETIF_IPV6_ADDRS_NUMOF; i++) {
unsigned match;
if ((netif->ipv6.addrs_flags[i] == 0) ||
((filter != NULL) && _addr_anycast(netif, i)) ||
/* discard const intentionally */
((filter != NULL) && !(bf_isset((uint8_t *)filter, i)))) {
continue;
}
match = ipv6_addr_match_prefix(&(netif->ipv6.addrs[i]), addr);
if (((match > 64U) || !ipv6_addr_is_link_local(&(netif->ipv6.addrs[i]))) &&
(match >= best_match)) {
idx = i;
best_match = match;
}
}
if (idx != -1) {
DEBUG("gnrc_netif: Found %s on interface %" PRIkernel_pid " matching ",
ipv6_addr_to_str(addr_str, &netif->ipv6.addrs[idx],
sizeof(addr_str)),
netif->pid);
DEBUG("%s by %u bits (used as source address = %s)\n",
ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)),
best_match,
(filter != NULL) ? "true" : "false");
}
else {
DEBUG("gnrc_netif: Did not found any address on interface %" PRIkernel_pid
" matching %s (used as source address = %s)\n",
netif->pid,
ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)),
(filter != NULL) ? "true" : "false");
}
return idx;
}
static uint8_t _get_scope(const ipv6_addr_t *addr)
{
if (ipv6_addr_is_link_local(addr)) {
return IPV6_ADDR_MCAST_SCP_LINK_LOCAL;
}
else if (ipv6_addr_is_site_local(addr)) {
return IPV6_ADDR_MCAST_SCP_SITE_LOCAL;
}
else {
return IPV6_ADDR_MCAST_SCP_GLOBAL;
}
}
static inline unsigned _get_state(const gnrc_netif_t *netif, unsigned idx)
{
return (netif->ipv6.addrs_flags[idx] &
GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_MASK);
}
/**
* @brief selects potential source address candidates
* @see <a href="http://tools.ietf.org/html/rfc6724#section-4">
* RFC6724, section 4
* </a>
* @param[in] netif the interface used for sending
* @param[in] dst the destination address
* @param[in] ll_only only consider link-local addresses
* @param[out] candidate_set a bitfield representing all addresses
* configured to @p netif, potential candidates
* will be marked as 1
*
* @return -1 if no candidates were found
* @return the index of the first candidate otherwise
*
* @pre the interface entry and its set of addresses must not be changed during
* runtime of this function
*/
static int _create_candidate_set(const gnrc_netif_t *netif,
const ipv6_addr_t *dst, bool ll_only,
uint8_t *candidate_set)
{
int res = -1;
DEBUG("gathering source address candidates\n");
/* currently this implementation supports only addresses as source address
* candidates assigned to this interface. Thus we assume all addresses to be
* on interface @p netif */
(void) dst;
for (int i = 0; i < GNRC_NETIF_IPV6_ADDRS_NUMOF; i++) {
const ipv6_addr_t *tmp = &(netif->ipv6.addrs[i]);
DEBUG("Checking address: %s\n",
ipv6_addr_to_str(addr_str, tmp, sizeof(addr_str)));
/* "In any case, multicast addresses and the unspecified address MUST NOT
* be included in a candidate set."
*/
if ((netif->ipv6.addrs_flags[i] == 0) ||
gnrc_netif_ipv6_addr_dad_trans(netif, i)) {
continue;
}
/* Check if we only want link local addresses */
if (ll_only && !ipv6_addr_is_link_local(tmp)) {
continue;
}
/* "For all multicast and link-local destination addresses, the set of
* candidate source addresses MUST only include addresses assigned to
* interfaces belonging to the same link as the outgoing interface."
*
* "For site-local unicast destination addresses, the set of candidate
* source addresses MUST only include addresses assigned to interfaces
* belonging to the same site as the outgoing interface."
* -> we should also be fine, since we're only iterating addresses of
* the sending interface
*/
/* put all other addresses into the candidate set */
DEBUG("add to candidate set\n");
bf_set(candidate_set, i);
if (res < 0) {
res = i;
}
}