-
Notifications
You must be signed in to change notification settings - Fork 102
/
transport.c
2170 lines (1800 loc) · 53.7 KB
/
transport.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
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2010-2011 EIA Electronics,
// Kurt Van Dijck <kurt.van.dijck@eia.be>
// Copyright (c) 2018 Protonic,
// Robin van der Gracht <robin@protonic.nl>
// Copyright (c) 2017-2019 Pengutronix,
// Marc Kleine-Budde <kernel@pengutronix.de>
// Copyright (c) 2017-2019 Pengutronix,
// Oleksij Rempel <kernel@pengutronix.de>
#include <linux/can/skb.h>
#include "j1939-priv.h"
#define J1939_XTP_TX_RETRY_LIMIT 100
#define J1939_ETP_PGN_CTL 0xc800
#define J1939_ETP_PGN_DAT 0xc700
#define J1939_TP_PGN_CTL 0xec00
#define J1939_TP_PGN_DAT 0xeb00
#define J1939_TP_CMD_RTS 0x10
#define J1939_TP_CMD_CTS 0x11
#define J1939_TP_CMD_EOMA 0x13
#define J1939_TP_CMD_BAM 0x20
#define J1939_TP_CMD_ABORT 0xff
#define J1939_ETP_CMD_RTS 0x14
#define J1939_ETP_CMD_CTS 0x15
#define J1939_ETP_CMD_DPO 0x16
#define J1939_ETP_CMD_EOMA 0x17
#define J1939_ETP_CMD_ABORT 0xff
enum j1939_xtp_abort {
J1939_XTP_NO_ABORT = 0,
J1939_XTP_ABORT_BUSY = 1,
/* Already in one or more connection managed sessions and
* cannot support another.
*
* EALREADY:
* Operation already in progress
*/
J1939_XTP_ABORT_RESOURCE = 2,
/* System resources were needed for another task so this
* connection managed session was terminated.
*
* EMSGSIZE:
* The socket type requires that message be sent atomically,
* and the size of the message to be sent made this
* impossible.
*/
J1939_XTP_ABORT_TIMEOUT = 3,
/* A timeout occurred and this is the connection abort to
* close the session.
*
* EHOSTUNREACH:
* The destination host cannot be reached (probably because
* the host is down or a remote router cannot reach it).
*/
J1939_XTP_ABORT_GENERIC = 4,
/* CTS messages received when data transfer is in progress
*
* EBADMSG:
* Not a data message
*/
J1939_XTP_ABORT_FAULT = 5,
/* Maximal retransmit request limit reached
*
* ENOTRECOVERABLE:
* State not recoverable
*/
J1939_XTP_ABORT_UNEXPECTED_DATA = 6,
/* Unexpected data transfer packet
*
* ENOTCONN:
* Transport endpoint is not connected
*/
J1939_XTP_ABORT_BAD_SEQ = 7,
/* Bad sequence number (and software is not able to recover)
*
* EILSEQ:
* Illegal byte sequence
*/
J1939_XTP_ABORT_DUP_SEQ = 8,
/* Duplicate sequence number (and software is not able to
* recover)
*/
J1939_XTP_ABORT_EDPO_UNEXPECTED = 9,
/* Unexpected EDPO packet (ETP) or Message size > 1785 bytes
* (TP)
*/
J1939_XTP_ABORT_BAD_EDPO_PGN = 10,
/* Unexpected EDPO PGN (PGN in EDPO is bad) */
J1939_XTP_ABORT_EDPO_OUTOF_CTS = 11,
/* EDPO number of packets is greater than CTS */
J1939_XTP_ABORT_BAD_EDPO_OFFSET = 12,
/* Bad EDPO offset */
J1939_XTP_ABORT_OTHER_DEPRECATED = 13,
/* Deprecated. Use 250 instead (Any other reason) */
J1939_XTP_ABORT_ECTS_UNXPECTED_PGN = 14,
/* Unexpected ECTS PGN (PGN in ECTS is bad) */
J1939_XTP_ABORT_ECTS_TOO_BIG = 15,
/* ECTS requested packets exceeds message size */
J1939_XTP_ABORT_OTHER = 250,
/* Any other reason (if a Connection Abort reason is
* identified that is not listed in the table use code 250)
*/
};
static unsigned int j1939_tp_block = 255;
static unsigned int j1939_tp_packet_delay;
static unsigned int j1939_tp_padding = 1;
/* helpers */
static const char *j1939_xtp_abort_to_str(enum j1939_xtp_abort abort)
{
switch (abort) {
case J1939_XTP_ABORT_BUSY:
return "Already in one or more connection managed sessions and cannot support another.";
case J1939_XTP_ABORT_RESOURCE:
return "System resources were needed for another task so this connection managed session was terminated.";
case J1939_XTP_ABORT_TIMEOUT:
return "A timeout occurred and this is the connection abort to close the session.";
case J1939_XTP_ABORT_GENERIC:
return "CTS messages received when data transfer is in progress";
case J1939_XTP_ABORT_FAULT:
return "Maximal retransmit request limit reached";
case J1939_XTP_ABORT_UNEXPECTED_DATA:
return "Unexpected data transfer packet";
case J1939_XTP_ABORT_BAD_SEQ:
return "Bad sequence number (and software is not able to recover)";
case J1939_XTP_ABORT_DUP_SEQ:
return "Duplicate sequence number (and software is not able to recover)";
case J1939_XTP_ABORT_EDPO_UNEXPECTED:
return "Unexpected EDPO packet (ETP) or Message size > 1785 bytes (TP)";
case J1939_XTP_ABORT_BAD_EDPO_PGN:
return "Unexpected EDPO PGN (PGN in EDPO is bad)";
case J1939_XTP_ABORT_EDPO_OUTOF_CTS:
return "EDPO number of packets is greater than CTS";
case J1939_XTP_ABORT_BAD_EDPO_OFFSET:
return "Bad EDPO offset";
case J1939_XTP_ABORT_OTHER_DEPRECATED:
return "Deprecated. Use 250 instead (Any other reason)";
case J1939_XTP_ABORT_ECTS_UNXPECTED_PGN:
return "Unexpected ECTS PGN (PGN in ECTS is bad)";
case J1939_XTP_ABORT_ECTS_TOO_BIG:
return "ECTS requested packets exceeds message size";
case J1939_XTP_ABORT_OTHER:
return "Any other reason (if a Connection Abort reason is identified that is not listed in the table use code 250)";
default:
return "<unknown>";
}
}
static int j1939_xtp_abort_to_errno(struct j1939_priv *priv,
enum j1939_xtp_abort abort)
{
int err;
switch (abort) {
case J1939_XTP_NO_ABORT:
WARN_ON_ONCE(abort == J1939_XTP_NO_ABORT);
err = 0;
break;
case J1939_XTP_ABORT_BUSY:
err = EALREADY;
break;
case J1939_XTP_ABORT_RESOURCE:
err = EMSGSIZE;
break;
case J1939_XTP_ABORT_TIMEOUT:
err = EHOSTUNREACH;
break;
case J1939_XTP_ABORT_GENERIC:
err = EBADMSG;
break;
case J1939_XTP_ABORT_FAULT:
err = ENOTRECOVERABLE;
break;
case J1939_XTP_ABORT_UNEXPECTED_DATA:
err = ENOTCONN;
break;
case J1939_XTP_ABORT_BAD_SEQ:
err = EILSEQ;
break;
case J1939_XTP_ABORT_DUP_SEQ:
err = EPROTO;
break;
case J1939_XTP_ABORT_EDPO_UNEXPECTED:
err = EPROTO;
break;
case J1939_XTP_ABORT_BAD_EDPO_PGN:
err = EPROTO;
break;
case J1939_XTP_ABORT_EDPO_OUTOF_CTS:
err = EPROTO;
break;
case J1939_XTP_ABORT_BAD_EDPO_OFFSET:
err = EPROTO;
break;
case J1939_XTP_ABORT_OTHER_DEPRECATED:
err = EPROTO;
break;
case J1939_XTP_ABORT_ECTS_UNXPECTED_PGN:
err = EPROTO;
break;
case J1939_XTP_ABORT_ECTS_TOO_BIG:
err = EPROTO;
break;
case J1939_XTP_ABORT_OTHER:
err = EPROTO;
break;
default:
netdev_warn(priv->ndev, "Unknown abort code %i", abort);
err = EPROTO;
}
return err;
}
static inline void j1939_session_list_lock(struct j1939_priv *priv)
{
spin_lock_bh(&priv->active_session_list_lock);
}
static inline void j1939_session_list_unlock(struct j1939_priv *priv)
{
spin_unlock_bh(&priv->active_session_list_lock);
}
void j1939_session_get(struct j1939_session *session)
{
kref_get(&session->kref);
}
/* session completion functions */
static void __j1939_session_drop(struct j1939_session *session)
{
if (!session->transmission)
return;
j1939_sock_pending_del(session->sk);
sock_put(session->sk);
}
static void j1939_session_destroy(struct j1939_session *session)
{
if (session->err)
j1939_sk_errqueue(session, J1939_ERRQUEUE_ABORT);
else
j1939_sk_errqueue(session, J1939_ERRQUEUE_ACK);
netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
WARN_ON_ONCE(!list_empty(&session->sk_session_queue_entry));
WARN_ON_ONCE(!list_empty(&session->active_session_list_entry));
skb_queue_purge(&session->skb_queue);
__j1939_session_drop(session);
j1939_priv_put(session->priv);
kfree(session);
}
static void __j1939_session_release(struct kref *kref)
{
struct j1939_session *session = container_of(kref, struct j1939_session,
kref);
j1939_session_destroy(session);
}
void j1939_session_put(struct j1939_session *session)
{
kref_put(&session->kref, __j1939_session_release);
}
static void j1939_session_txtimer_cancel(struct j1939_session *session)
{
if (hrtimer_cancel(&session->txtimer))
j1939_session_put(session);
}
static void j1939_session_rxtimer_cancel(struct j1939_session *session)
{
if (hrtimer_cancel(&session->rxtimer))
j1939_session_put(session);
}
void j1939_session_timers_cancel(struct j1939_session *session)
{
j1939_session_txtimer_cancel(session);
j1939_session_rxtimer_cancel(session);
}
static inline bool j1939_cb_is_broadcast(const struct j1939_sk_buff_cb *skcb)
{
return (!skcb->addr.dst_name && (skcb->addr.da == 0xff));
}
static void j1939_session_skb_drop_old(struct j1939_session *session)
{
struct sk_buff *do_skb;
struct j1939_sk_buff_cb *do_skcb;
unsigned int offset_start;
unsigned long flags;
if (skb_queue_len(&session->skb_queue) < 2)
return;
offset_start = session->pkt.tx_acked * 7;
spin_lock_irqsave(&session->skb_queue.lock, flags);
do_skb = skb_peek(&session->skb_queue);
do_skcb = j1939_skb_to_cb(do_skb);
if ((do_skcb->offset + do_skb->len) < offset_start) {
__skb_unlink(do_skb, &session->skb_queue);
/* drop ref taken in j1939_session_skb_queue() */
skb_unref(do_skb);
kfree_skb(do_skb);
}
spin_unlock_irqrestore(&session->skb_queue.lock, flags);
}
void j1939_session_skb_queue(struct j1939_session *session,
struct sk_buff *skb)
{
struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
struct j1939_priv *priv = session->priv;
j1939_ac_fixup(priv, skb);
if (j1939_address_is_unicast(skcb->addr.da) &&
priv->ents[skcb->addr.da].nusers)
skcb->flags |= J1939_ECU_LOCAL_DST;
skcb->flags |= J1939_ECU_LOCAL_SRC;
skb_get(skb);
skb_queue_tail(&session->skb_queue, skb);
}
static struct
sk_buff *j1939_session_skb_get_by_offset(struct j1939_session *session,
unsigned int offset_start)
{
struct j1939_priv *priv = session->priv;
struct j1939_sk_buff_cb *do_skcb;
struct sk_buff *skb = NULL;
struct sk_buff *do_skb;
unsigned long flags;
spin_lock_irqsave(&session->skb_queue.lock, flags);
skb_queue_walk(&session->skb_queue, do_skb) {
do_skcb = j1939_skb_to_cb(do_skb);
if (offset_start >= do_skcb->offset &&
offset_start < (do_skcb->offset + do_skb->len)) {
skb = do_skb;
}
}
if (skb)
skb_get(skb);
spin_unlock_irqrestore(&session->skb_queue.lock, flags);
if (!skb)
netdev_dbg(priv->ndev, "%s: 0x%p: no skb found for start: %i, queue size: %i\n",
__func__, session, offset_start,
skb_queue_len(&session->skb_queue));
return skb;
}
static struct sk_buff *j1939_session_skb_get(struct j1939_session *session)
{
unsigned int offset_start;
offset_start = session->pkt.dpo * 7;
return j1939_session_skb_get_by_offset(session, offset_start);
}
/* see if we are receiver
* returns 0 for broadcasts, although we will receive them
*/
static inline int j1939_tp_im_receiver(const struct j1939_sk_buff_cb *skcb)
{
return skcb->flags & J1939_ECU_LOCAL_DST;
}
/* see if we are sender */
static inline int j1939_tp_im_transmitter(const struct j1939_sk_buff_cb *skcb)
{
return skcb->flags & J1939_ECU_LOCAL_SRC;
}
/* see if we are involved as either receiver or transmitter */
static int j1939_tp_im_involved(const struct j1939_sk_buff_cb *skcb, bool swap)
{
if (swap)
return j1939_tp_im_receiver(skcb);
else
return j1939_tp_im_transmitter(skcb);
}
static int j1939_tp_im_involved_anydir(struct j1939_sk_buff_cb *skcb)
{
return skcb->flags & (J1939_ECU_LOCAL_SRC | J1939_ECU_LOCAL_DST);
}
/* extract pgn from flow-ctl message */
static inline pgn_t j1939_xtp_ctl_to_pgn(const u8 *dat)
{
pgn_t pgn;
pgn = (dat[7] << 16) | (dat[6] << 8) | (dat[5] << 0);
if (j1939_pgn_is_pdu1(pgn))
pgn &= 0xffff00;
return pgn;
}
static inline unsigned int j1939_tp_ctl_to_size(const u8 *dat)
{
return (dat[2] << 8) + (dat[1] << 0);
}
static inline unsigned int j1939_etp_ctl_to_packet(const u8 *dat)
{
return (dat[4] << 16) | (dat[3] << 8) | (dat[2] << 0);
}
static inline unsigned int j1939_etp_ctl_to_size(const u8 *dat)
{
return (dat[4] << 24) | (dat[3] << 16) |
(dat[2] << 8) | (dat[1] << 0);
}
/* find existing session:
* reverse: swap cb's src & dst
* there is no problem with matching broadcasts, since
* broadcasts (no dst, no da) would never call this
* with reverse == true
*/
static bool j1939_session_match(struct j1939_addr *se_addr,
struct j1939_addr *sk_addr, bool reverse)
{
if (se_addr->type != sk_addr->type)
return false;
if (reverse) {
if (se_addr->src_name) {
if (se_addr->src_name != sk_addr->dst_name)
return false;
} else if (se_addr->sa != sk_addr->da) {
return false;
}
if (se_addr->dst_name) {
if (se_addr->dst_name != sk_addr->src_name)
return false;
} else if (se_addr->da != sk_addr->sa) {
return false;
}
} else {
if (se_addr->src_name) {
if (se_addr->src_name != sk_addr->src_name)
return false;
} else if (se_addr->sa != sk_addr->sa) {
return false;
}
if (se_addr->dst_name) {
if (se_addr->dst_name != sk_addr->dst_name)
return false;
} else if (se_addr->da != sk_addr->da) {
return false;
}
}
return true;
}
static struct
j1939_session *j1939_session_get_by_addr_locked(struct j1939_priv *priv,
struct list_head *root,
struct j1939_addr *addr,
bool reverse, bool transmitter)
{
struct j1939_session *session;
lockdep_assert_held(&priv->active_session_list_lock);
list_for_each_entry(session, root, active_session_list_entry) {
j1939_session_get(session);
if (j1939_session_match(&session->skcb.addr, addr, reverse) &&
session->transmission == transmitter)
return session;
j1939_session_put(session);
}
return NULL;
}
static struct
j1939_session *j1939_session_get_simple(struct j1939_priv *priv,
struct sk_buff *skb)
{
struct j1939_sk_buff_cb *skcb = j1939_skb_to_cb(skb);
struct j1939_session *session;
lockdep_assert_held(&priv->active_session_list_lock);
list_for_each_entry(session, &priv->active_session_list,
active_session_list_entry) {
j1939_session_get(session);
if (session->skcb.addr.type == J1939_SIMPLE &&
session->tskey == skcb->tskey && session->sk == skb->sk)
return session;
j1939_session_put(session);
}
return NULL;
}
static struct
j1939_session *j1939_session_get_by_addr(struct j1939_priv *priv,
struct j1939_addr *addr,
bool reverse, bool transmitter)
{
struct j1939_session *session;
j1939_session_list_lock(priv);
session = j1939_session_get_by_addr_locked(priv,
&priv->active_session_list,
addr, reverse, transmitter);
j1939_session_list_unlock(priv);
return session;
}
static void j1939_skbcb_swap(struct j1939_sk_buff_cb *skcb)
{
u8 tmp = 0;
swap(skcb->addr.dst_name, skcb->addr.src_name);
swap(skcb->addr.da, skcb->addr.sa);
/* swap SRC and DST flags, leave other untouched */
if (skcb->flags & J1939_ECU_LOCAL_SRC)
tmp |= J1939_ECU_LOCAL_DST;
if (skcb->flags & J1939_ECU_LOCAL_DST)
tmp |= J1939_ECU_LOCAL_SRC;
skcb->flags &= ~(J1939_ECU_LOCAL_SRC | J1939_ECU_LOCAL_DST);
skcb->flags |= tmp;
}
static struct
sk_buff *j1939_tp_tx_dat_new(struct j1939_priv *priv,
const struct j1939_sk_buff_cb *re_skcb,
bool ctl,
bool swap_src_dst)
{
struct sk_buff *skb;
struct j1939_sk_buff_cb *skcb;
skb = alloc_skb(sizeof(struct can_frame) + sizeof(struct can_skb_priv),
GFP_ATOMIC);
if (unlikely(!skb))
return ERR_PTR(-ENOMEM);
skb->dev = priv->ndev;
can_skb_reserve(skb);
can_skb_prv(skb)->ifindex = priv->ndev->ifindex;
can_skb_prv(skb)->skbcnt = 0;
/* reserve CAN header */
skb_reserve(skb, offsetof(struct can_frame, data));
memcpy(skb->cb, re_skcb, sizeof(skb->cb));
skcb = j1939_skb_to_cb(skb);
if (swap_src_dst)
j1939_skbcb_swap(skcb);
if (ctl) {
if (skcb->addr.type == J1939_ETP)
skcb->addr.pgn = J1939_ETP_PGN_CTL;
else
skcb->addr.pgn = J1939_TP_PGN_CTL;
} else {
if (skcb->addr.type == J1939_ETP)
skcb->addr.pgn = J1939_ETP_PGN_DAT;
else
skcb->addr.pgn = J1939_TP_PGN_DAT;
}
return skb;
}
/* TP transmit packet functions */
static int j1939_tp_tx_dat(struct j1939_session *session,
const u8 *dat, int len)
{
struct j1939_priv *priv = session->priv;
struct sk_buff *skb;
skb = j1939_tp_tx_dat_new(priv, &session->skcb,
false, false);
if (IS_ERR(skb))
return PTR_ERR(skb);
skb_put_data(skb, dat, len);
if (j1939_tp_padding && len < 8)
memset(skb_put(skb, 8 - len), 0xff, 8 - len);
return j1939_send_one(priv, skb);
}
static int j1939_xtp_do_tx_ctl(struct j1939_priv *priv,
const struct j1939_sk_buff_cb *re_skcb,
bool swap_src_dst, pgn_t pgn, const u8 *dat)
{
struct sk_buff *skb;
u8 *skdat;
if (!j1939_tp_im_involved(re_skcb, swap_src_dst))
return 0;
skb = j1939_tp_tx_dat_new(priv, re_skcb, true, swap_src_dst);
if (IS_ERR(skb))
return PTR_ERR(skb);
skdat = skb_put(skb, 8);
memcpy(skdat, dat, 5);
skdat[5] = (pgn >> 0);
skdat[6] = (pgn >> 8);
skdat[7] = (pgn >> 16);
return j1939_send_one(priv, skb);
}
static inline int j1939_tp_tx_ctl(struct j1939_session *session,
bool swap_src_dst, const u8 *dat)
{
struct j1939_priv *priv = session->priv;
return j1939_xtp_do_tx_ctl(priv, &session->skcb,
swap_src_dst,
session->skcb.addr.pgn, dat);
}
static int j1939_xtp_tx_abort(struct j1939_priv *priv,
const struct j1939_sk_buff_cb *re_skcb,
bool swap_src_dst,
enum j1939_xtp_abort err,
pgn_t pgn)
{
u8 dat[5];
if (!j1939_tp_im_involved(re_skcb, swap_src_dst))
return 0;
memset(dat, 0xff, sizeof(dat));
dat[0] = J1939_TP_CMD_ABORT;
dat[1] = err;
return j1939_xtp_do_tx_ctl(priv, re_skcb, swap_src_dst, pgn, dat);
}
void j1939_tp_schedule_txtimer(struct j1939_session *session, int msec)
{
j1939_session_get(session);
hrtimer_start(&session->txtimer, ms_to_ktime(msec),
HRTIMER_MODE_REL_SOFT);
}
static inline void j1939_tp_set_rxtimeout(struct j1939_session *session,
int msec)
{
j1939_session_rxtimer_cancel(session);
j1939_session_get(session);
hrtimer_start(&session->rxtimer, ms_to_ktime(msec),
HRTIMER_MODE_REL_SOFT);
}
static int j1939_session_tx_rts(struct j1939_session *session)
{
u8 dat[8];
int ret;
memset(dat, 0xff, sizeof(dat));
dat[1] = (session->total_message_size >> 0);
dat[2] = (session->total_message_size >> 8);
dat[3] = session->pkt.total;
if (session->skcb.addr.type == J1939_ETP) {
dat[0] = J1939_ETP_CMD_RTS;
dat[1] = (session->total_message_size >> 0);
dat[2] = (session->total_message_size >> 8);
dat[3] = (session->total_message_size >> 16);
dat[4] = (session->total_message_size >> 24);
} else if (j1939_cb_is_broadcast(&session->skcb)) {
dat[0] = J1939_TP_CMD_BAM;
/* fake cts for broadcast */
session->pkt.tx = 0;
} else {
dat[0] = J1939_TP_CMD_RTS;
dat[4] = dat[3];
}
if (dat[0] == session->last_txcmd)
/* done already */
return 0;
ret = j1939_tp_tx_ctl(session, false, dat);
if (ret < 0)
return ret;
session->last_txcmd = dat[0];
if (dat[0] == J1939_TP_CMD_BAM) {
j1939_tp_schedule_txtimer(session, 50);
j1939_tp_set_rxtimeout(session, 250);
} else {
j1939_tp_set_rxtimeout(session, 1250);
}
netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
return 0;
}
static int j1939_session_tx_dpo(struct j1939_session *session)
{
unsigned int pkt;
u8 dat[8];
int ret;
memset(dat, 0xff, sizeof(dat));
dat[0] = J1939_ETP_CMD_DPO;
session->pkt.dpo = session->pkt.tx_acked;
pkt = session->pkt.dpo;
dat[1] = session->pkt.last - session->pkt.tx_acked;
dat[2] = (pkt >> 0);
dat[3] = (pkt >> 8);
dat[4] = (pkt >> 16);
ret = j1939_tp_tx_ctl(session, false, dat);
if (ret < 0)
return ret;
session->last_txcmd = dat[0];
j1939_tp_set_rxtimeout(session, 1250);
session->pkt.tx = session->pkt.tx_acked;
netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
return 0;
}
static int j1939_session_tx_dat(struct j1939_session *session)
{
struct j1939_priv *priv = session->priv;
struct j1939_sk_buff_cb *skcb;
int offset, pkt_done, pkt_end;
unsigned int len, pdelay;
struct sk_buff *se_skb;
const u8 *tpdat;
int ret = 0;
u8 dat[8];
se_skb = j1939_session_skb_get_by_offset(session, session->pkt.tx * 7);
if (!se_skb)
return -ENOBUFS;
skcb = j1939_skb_to_cb(se_skb);
tpdat = se_skb->data;
ret = 0;
pkt_done = 0;
if (session->skcb.addr.type != J1939_ETP &&
j1939_cb_is_broadcast(&session->skcb))
pkt_end = session->pkt.total;
else
pkt_end = session->pkt.last;
while (session->pkt.tx < pkt_end) {
dat[0] = session->pkt.tx - session->pkt.dpo + 1;
offset = (session->pkt.tx * 7) - skcb->offset;
len = se_skb->len - offset;
if (len > 7)
len = 7;
if (offset + len > se_skb->len) {
netdev_err_once(priv->ndev,
"%s: 0x%p: requested data outside of queued buffer: offset %i, len %i, pkt.tx: %i\n",
__func__, session, skcb->offset, se_skb->len , session->pkt.tx);
ret = -EOVERFLOW;
goto out_free;
}
if (!len) {
ret = -ENOBUFS;
break;
}
memcpy(&dat[1], &tpdat[offset], len);
ret = j1939_tp_tx_dat(session, dat, len + 1);
if (ret < 0) {
/* ENOBUS == CAN interface TX queue is full */
if (ret != -ENOBUFS)
netdev_alert(priv->ndev,
"%s: 0x%p: queue data error: %i\n",
__func__, session, ret);
break;
}
session->last_txcmd = 0xff;
pkt_done++;
session->pkt.tx++;
pdelay = j1939_cb_is_broadcast(&session->skcb) ? 50 :
j1939_tp_packet_delay;
if (session->pkt.tx < session->pkt.total && pdelay) {
j1939_tp_schedule_txtimer(session, pdelay);
break;
}
}
if (pkt_done)
j1939_tp_set_rxtimeout(session, 250);
out_free:
if (ret)
kfree_skb(se_skb);
else
consume_skb(se_skb);
return ret;
}
static int j1939_xtp_txnext_transmiter(struct j1939_session *session)
{
struct j1939_priv *priv = session->priv;
int ret = 0;
if (!j1939_tp_im_transmitter(&session->skcb)) {
netdev_alert(priv->ndev, "%s: 0x%p: called by not transmitter!\n",
__func__, session);
return -EINVAL;
}
switch (session->last_cmd) {
case 0:
ret = j1939_session_tx_rts(session);
break;
case J1939_ETP_CMD_CTS:
if (session->last_txcmd != J1939_ETP_CMD_DPO) {
ret = j1939_session_tx_dpo(session);
if (ret)
return ret;
}
fallthrough;
case J1939_TP_CMD_CTS:
case 0xff: /* did some data */
case J1939_ETP_CMD_DPO:
case J1939_TP_CMD_BAM:
ret = j1939_session_tx_dat(session);
break;
default:
netdev_alert(priv->ndev, "%s: 0x%p: unexpected last_cmd: %x\n",
__func__, session, session->last_cmd);
}
return ret;
}
static int j1939_session_tx_cts(struct j1939_session *session)
{
struct j1939_priv *priv = session->priv;
unsigned int pkt, len;
int ret;
u8 dat[8];
if (!j1939_sk_recv_match(priv, &session->skcb))
return -ENOENT;
len = session->pkt.total - session->pkt.rx;
len = min3(len, session->pkt.block, j1939_tp_block ?: 255);
memset(dat, 0xff, sizeof(dat));
if (session->skcb.addr.type == J1939_ETP) {
pkt = session->pkt.rx + 1;
dat[0] = J1939_ETP_CMD_CTS;
dat[1] = len;
dat[2] = (pkt >> 0);
dat[3] = (pkt >> 8);
dat[4] = (pkt >> 16);
} else {
dat[0] = J1939_TP_CMD_CTS;
dat[1] = len;
dat[2] = session->pkt.rx + 1;
}
if (dat[0] == session->last_txcmd)
/* done already */
return 0;
ret = j1939_tp_tx_ctl(session, true, dat);
if (ret < 0)
return ret;
if (len)
/* only mark cts done when len is set */
session->last_txcmd = dat[0];
j1939_tp_set_rxtimeout(session, 1250);
netdev_dbg(session->priv->ndev, "%s: 0x%p\n", __func__, session);
return 0;
}
static int j1939_session_tx_eoma(struct j1939_session *session)
{
struct j1939_priv *priv = session->priv;
u8 dat[8];
int ret;
if (!j1939_sk_recv_match(priv, &session->skcb))
return -ENOENT;
memset(dat, 0xff, sizeof(dat));
if (session->skcb.addr.type == J1939_ETP) {
dat[0] = J1939_ETP_CMD_EOMA;
dat[1] = session->total_message_size >> 0;
dat[2] = session->total_message_size >> 8;
dat[3] = session->total_message_size >> 16;
dat[4] = session->total_message_size >> 24;
} else {
dat[0] = J1939_TP_CMD_EOMA;
dat[1] = session->total_message_size;
dat[2] = session->total_message_size >> 8;
dat[3] = session->pkt.total;
}
if (dat[0] == session->last_txcmd)
/* done already */
return 0;
ret = j1939_tp_tx_ctl(session, true, dat);
if (ret < 0)
return ret;
session->last_txcmd = dat[0];
/* wait for the EOMA packet to come in */
j1939_tp_set_rxtimeout(session, 1250);
netdev_dbg(session->priv->ndev, "%p: 0x%p\n", __func__, session);
return 0;
}
static int j1939_xtp_txnext_receiver(struct j1939_session *session)
{
struct j1939_priv *priv = session->priv;
int ret = 0;
if (!j1939_tp_im_receiver(&session->skcb)) {
netdev_alert(priv->ndev, "%s: 0x%p: called by not receiver!\n",
__func__, session);
return -EINVAL;
}
switch (session->last_cmd) {
case J1939_TP_CMD_RTS:
case J1939_ETP_CMD_RTS:
ret = j1939_session_tx_cts(session);
break;
case J1939_ETP_CMD_CTS:
case J1939_TP_CMD_CTS: